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kernel-ark/drivers/usb/gadget/lpc32xx_udc.c
Linus Torvalds 2d1eb87ae1 Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 
Pull ARM changes from Russell King:

 - Perf updates from Will Deacon:
   - Support for Qualcomm Krait processors (run perf on your phone!)
   - Support for Cortex-A12 (run perf stat on your FPGA!)
   - Support for perf_sample_event_took, allowing us to automatically decrease
     the sample rate if we can't handle the PMU interrupts quickly enough
     (run perf record on your FPGA!).

 - Basic uprobes support from David Long:
     This patch series adds basic uprobes support to ARM. It is based on
     patches developed earlier by Rabin Vincent. That approach of adding
     hooks into the kprobes instruction parsing code was not well received.
     This approach separates the ARM instruction parsing code in kprobes out
     into a separate set of functions which can be used by both kprobes and
     uprobes. Both kprobes and uprobes then provide their own semantic action
     tables to process the results of the parsing.

 - ARMv7M (microcontroller) updates from Uwe Kleine-König

 - OMAP DMA updates (recently added Vinod's Ack even though they've been
   sitting in linux-next for a few months) to reduce the reliance of
   omap-dma on the code in arch/arm.

 - SA11x0 changes from Dmitry Eremin-Solenikov and Alexander Shiyan

 - Support for Cortex-A12 CPU

 - Align support for ARMv6 with ARMv7 so they can cooperate better in a
   single zImage.

 - Addition of first AT_HWCAP2 feature bits for ARMv8 crypto support.

 - Removal of IRQ_DISABLED from various ARM files

 - Improved efficiency of virt_to_page() for single zImage

 - Patch from Ulf Hansson to permit runtime PM callbacks to be available for
   AMBA devices for suspend/resume as well.

 - Finally kill asm/system.h on ARM.

* 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm: (89 commits)
  dmaengine: omap-dma: more consolidation of CCR register setup
  dmaengine: omap-dma: move IRQ handling to omap-dma
  dmaengine: omap-dma: move register read/writes into omap-dma.c
  ARM: omap: dma: get rid of 'p' allocation and clean up
  ARM: omap: move dma channel allocation into plat-omap code
  ARM: omap: dma: get rid of errata global
  ARM: omap: clean up DMA register accesses
  ARM: omap: remove almost-const variables
  ARM: omap: remove references to disable_irq_lch
  dmaengine: omap-dma: cleanup errata 3.3 handling
  dmaengine: omap-dma: provide register read/write functions
  dmaengine: omap-dma: use cached CCR value when enabling DMA
  dmaengine: omap-dma: move barrier to omap_dma_start_desc()
  dmaengine: omap-dma: move clnk_ctrl setting to preparation functions
  dmaengine: omap-dma: improve efficiency loading C.SA/C.EI/C.FI registers
  dmaengine: omap-dma: consolidate clearing channel status register
  dmaengine: omap-dma: move CCR buffering disable errata out of the fast path
  dmaengine: omap-dma: provide register definitions
  dmaengine: omap-dma: consolidate setup of CCR
  dmaengine: omap-dma: consolidate setup of CSDP
  ...
2014-04-05 13:20:43 -07:00

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/*
* USB Gadget driver for LPC32xx
*
* Authors:
* Kevin Wells <kevin.wells@nxp.com>
* Mike James
* Roland Stigge <stigge@antcom.de>
*
* Copyright (C) 2006 Philips Semiconductors
* Copyright (C) 2009 NXP Semiconductors
* Copyright (C) 2012 Roland Stigge
*
* Note: This driver is based on original work done by Mike James for
* the LPC3180.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/clk.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/i2c.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/workqueue.h>
#include <linux/of.h>
#include <linux/usb/isp1301.h>
#include <asm/byteorder.h>
#include <mach/hardware.h>
#include <linux/io.h>
#include <asm/irq.h>
#include <mach/platform.h>
#include <mach/irqs.h>
#include <mach/board.h>
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#endif
/*
* USB device configuration structure
*/
typedef void (*usc_chg_event)(int);
struct lpc32xx_usbd_cfg {
int vbus_drv_pol; /* 0=active low drive for VBUS via ISP1301 */
usc_chg_event conn_chgb; /* Connection change event (optional) */
usc_chg_event susp_chgb; /* Suspend/resume event (optional) */
usc_chg_event rmwk_chgb; /* Enable/disable remote wakeup */
};
/*
* controller driver data structures
*/
/* 16 endpoints (not to be confused with 32 hardware endpoints) */
#define NUM_ENDPOINTS 16
/*
* IRQ indices make reading the code a little easier
*/
#define IRQ_USB_LP 0
#define IRQ_USB_HP 1
#define IRQ_USB_DEVDMA 2
#define IRQ_USB_ATX 3
#define EP_OUT 0 /* RX (from host) */
#define EP_IN 1 /* TX (to host) */
/* Returns the interrupt mask for the selected hardware endpoint */
#define EP_MASK_SEL(ep, dir) (1 << (((ep) * 2) + dir))
#define EP_INT_TYPE 0
#define EP_ISO_TYPE 1
#define EP_BLK_TYPE 2
#define EP_CTL_TYPE 3
/* EP0 states */
#define WAIT_FOR_SETUP 0 /* Wait for setup packet */
#define DATA_IN 1 /* Expect dev->host transfer */
#define DATA_OUT 2 /* Expect host->dev transfer */
/* DD (DMA Descriptor) structure, requires word alignment, this is already
* defined in the LPC32XX USB device header file, but this version is slightly
* modified to tag some work data with each DMA descriptor. */
struct lpc32xx_usbd_dd_gad {
u32 dd_next_phy;
u32 dd_setup;
u32 dd_buffer_addr;
u32 dd_status;
u32 dd_iso_ps_mem_addr;
u32 this_dma;
u32 iso_status[6]; /* 5 spare */
u32 dd_next_v;
};
/*
* Logical endpoint structure
*/
struct lpc32xx_ep {
struct usb_ep ep;
struct list_head queue;
struct lpc32xx_udc *udc;
u32 hwep_num_base; /* Physical hardware EP */
u32 hwep_num; /* Maps to hardware endpoint */
u32 maxpacket;
u32 lep;
bool is_in;
bool req_pending;
u32 eptype;
u32 totalints;
bool wedge;
};
/*
* Common UDC structure
*/
struct lpc32xx_udc {
struct usb_gadget gadget;
struct usb_gadget_driver *driver;
struct platform_device *pdev;
struct device *dev;
struct dentry *pde;
spinlock_t lock;
struct i2c_client *isp1301_i2c_client;
/* Board and device specific */
struct lpc32xx_usbd_cfg *board;
u32 io_p_start;
u32 io_p_size;
void __iomem *udp_baseaddr;
int udp_irq[4];
struct clk *usb_pll_clk;
struct clk *usb_slv_clk;
struct clk *usb_otg_clk;
/* DMA support */
u32 *udca_v_base;
u32 udca_p_base;
struct dma_pool *dd_cache;
/* Common EP and control data */
u32 enabled_devints;
u32 enabled_hwepints;
u32 dev_status;
u32 realized_eps;
/* VBUS detection, pullup, and power flags */
u8 vbus;
u8 last_vbus;
int pullup;
int poweron;
/* Work queues related to I2C support */
struct work_struct pullup_job;
struct work_struct vbus_job;
struct work_struct power_job;
/* USB device peripheral - various */
struct lpc32xx_ep ep[NUM_ENDPOINTS];
bool enabled;
bool clocked;
bool suspended;
bool selfpowered;
int ep0state;
atomic_t enabled_ep_cnt;
wait_queue_head_t ep_disable_wait_queue;
};
/*
* Endpoint request
*/
struct lpc32xx_request {
struct usb_request req;
struct list_head queue;
struct lpc32xx_usbd_dd_gad *dd_desc_ptr;
bool mapped;
bool send_zlp;
};
static inline struct lpc32xx_udc *to_udc(struct usb_gadget *g)
{
return container_of(g, struct lpc32xx_udc, gadget);
}
#define ep_dbg(epp, fmt, arg...) \
dev_dbg(epp->udc->dev, "%s: " fmt, __func__, ## arg)
#define ep_err(epp, fmt, arg...) \
dev_err(epp->udc->dev, "%s: " fmt, __func__, ## arg)
#define ep_info(epp, fmt, arg...) \
dev_info(epp->udc->dev, "%s: " fmt, __func__, ## arg)
#define ep_warn(epp, fmt, arg...) \
dev_warn(epp->udc->dev, "%s:" fmt, __func__, ## arg)
#define UDCA_BUFF_SIZE (128)
/* TODO: When the clock framework is introduced in LPC32xx, IO_ADDRESS will
* be replaced with an inremap()ed pointer
* */
#define USB_CTRL IO_ADDRESS(LPC32XX_CLK_PM_BASE + 0x64)
/* USB_CTRL bit defines */
#define USB_SLAVE_HCLK_EN (1 << 24)
#define USB_HOST_NEED_CLK_EN (1 << 21)
#define USB_DEV_NEED_CLK_EN (1 << 22)
/**********************************************************************
* USB device controller register offsets
**********************************************************************/
#define USBD_DEVINTST(x) ((x) + 0x200)
#define USBD_DEVINTEN(x) ((x) + 0x204)
#define USBD_DEVINTCLR(x) ((x) + 0x208)
#define USBD_DEVINTSET(x) ((x) + 0x20C)
#define USBD_CMDCODE(x) ((x) + 0x210)
#define USBD_CMDDATA(x) ((x) + 0x214)
#define USBD_RXDATA(x) ((x) + 0x218)
#define USBD_TXDATA(x) ((x) + 0x21C)
#define USBD_RXPLEN(x) ((x) + 0x220)
#define USBD_TXPLEN(x) ((x) + 0x224)
#define USBD_CTRL(x) ((x) + 0x228)
#define USBD_DEVINTPRI(x) ((x) + 0x22C)
#define USBD_EPINTST(x) ((x) + 0x230)
#define USBD_EPINTEN(x) ((x) + 0x234)
#define USBD_EPINTCLR(x) ((x) + 0x238)
#define USBD_EPINTSET(x) ((x) + 0x23C)
#define USBD_EPINTPRI(x) ((x) + 0x240)
#define USBD_REEP(x) ((x) + 0x244)
#define USBD_EPIND(x) ((x) + 0x248)
#define USBD_EPMAXPSIZE(x) ((x) + 0x24C)
/* DMA support registers only below */
/* Set, clear, or get enabled state of the DMA request status. If
* enabled, an IN or OUT token will start a DMA transfer for the EP */
#define USBD_DMARST(x) ((x) + 0x250)
#define USBD_DMARCLR(x) ((x) + 0x254)
#define USBD_DMARSET(x) ((x) + 0x258)
/* DMA UDCA head pointer */
#define USBD_UDCAH(x) ((x) + 0x280)
/* EP DMA status, enable, and disable. This is used to specifically
* enabled or disable DMA for a specific EP */
#define USBD_EPDMAST(x) ((x) + 0x284)
#define USBD_EPDMAEN(x) ((x) + 0x288)
#define USBD_EPDMADIS(x) ((x) + 0x28C)
/* DMA master interrupts enable and pending interrupts */
#define USBD_DMAINTST(x) ((x) + 0x290)
#define USBD_DMAINTEN(x) ((x) + 0x294)
/* DMA end of transfer interrupt enable, disable, status */
#define USBD_EOTINTST(x) ((x) + 0x2A0)
#define USBD_EOTINTCLR(x) ((x) + 0x2A4)
#define USBD_EOTINTSET(x) ((x) + 0x2A8)
/* New DD request interrupt enable, disable, status */
#define USBD_NDDRTINTST(x) ((x) + 0x2AC)
#define USBD_NDDRTINTCLR(x) ((x) + 0x2B0)
#define USBD_NDDRTINTSET(x) ((x) + 0x2B4)
/* DMA error interrupt enable, disable, status */
#define USBD_SYSERRTINTST(x) ((x) + 0x2B8)
#define USBD_SYSERRTINTCLR(x) ((x) + 0x2BC)
#define USBD_SYSERRTINTSET(x) ((x) + 0x2C0)
/**********************************************************************
* USBD_DEVINTST/USBD_DEVINTEN/USBD_DEVINTCLR/USBD_DEVINTSET/
* USBD_DEVINTPRI register definitions
**********************************************************************/
#define USBD_ERR_INT (1 << 9)
#define USBD_EP_RLZED (1 << 8)
#define USBD_TXENDPKT (1 << 7)
#define USBD_RXENDPKT (1 << 6)
#define USBD_CDFULL (1 << 5)
#define USBD_CCEMPTY (1 << 4)
#define USBD_DEV_STAT (1 << 3)
#define USBD_EP_SLOW (1 << 2)
#define USBD_EP_FAST (1 << 1)
#define USBD_FRAME (1 << 0)
/**********************************************************************
* USBD_EPINTST/USBD_EPINTEN/USBD_EPINTCLR/USBD_EPINTSET/
* USBD_EPINTPRI register definitions
**********************************************************************/
/* End point selection macro (RX) */
#define USBD_RX_EP_SEL(e) (1 << ((e) << 1))
/* End point selection macro (TX) */
#define USBD_TX_EP_SEL(e) (1 << (((e) << 1) + 1))
/**********************************************************************
* USBD_REEP/USBD_DMARST/USBD_DMARCLR/USBD_DMARSET/USBD_EPDMAST/
* USBD_EPDMAEN/USBD_EPDMADIS/
* USBD_NDDRTINTST/USBD_NDDRTINTCLR/USBD_NDDRTINTSET/
* USBD_EOTINTST/USBD_EOTINTCLR/USBD_EOTINTSET/
* USBD_SYSERRTINTST/USBD_SYSERRTINTCLR/USBD_SYSERRTINTSET
* register definitions
**********************************************************************/
/* Endpoint selection macro */
#define USBD_EP_SEL(e) (1 << (e))
/**********************************************************************
* SBD_DMAINTST/USBD_DMAINTEN
**********************************************************************/
#define USBD_SYS_ERR_INT (1 << 2)
#define USBD_NEW_DD_INT (1 << 1)
#define USBD_EOT_INT (1 << 0)
/**********************************************************************
* USBD_RXPLEN register definitions
**********************************************************************/
#define USBD_PKT_RDY (1 << 11)
#define USBD_DV (1 << 10)
#define USBD_PK_LEN_MASK 0x3FF
/**********************************************************************
* USBD_CTRL register definitions
**********************************************************************/
#define USBD_LOG_ENDPOINT(e) ((e) << 2)
#define USBD_WR_EN (1 << 1)
#define USBD_RD_EN (1 << 0)
/**********************************************************************
* USBD_CMDCODE register definitions
**********************************************************************/
#define USBD_CMD_CODE(c) ((c) << 16)
#define USBD_CMD_PHASE(p) ((p) << 8)
/**********************************************************************
* USBD_DMARST/USBD_DMARCLR/USBD_DMARSET register definitions
**********************************************************************/
#define USBD_DMAEP(e) (1 << (e))
/* DD (DMA Descriptor) structure, requires word alignment */
struct lpc32xx_usbd_dd {
u32 *dd_next;
u32 dd_setup;
u32 dd_buffer_addr;
u32 dd_status;
u32 dd_iso_ps_mem_addr;
};
/* dd_setup bit defines */
#define DD_SETUP_ATLE_DMA_MODE 0x01
#define DD_SETUP_NEXT_DD_VALID 0x04
#define DD_SETUP_ISO_EP 0x10
#define DD_SETUP_PACKETLEN(n) (((n) & 0x7FF) << 5)
#define DD_SETUP_DMALENBYTES(n) (((n) & 0xFFFF) << 16)
/* dd_status bit defines */
#define DD_STATUS_DD_RETIRED 0x01
#define DD_STATUS_STS_MASK 0x1E
#define DD_STATUS_STS_NS 0x00 /* Not serviced */
#define DD_STATUS_STS_BS 0x02 /* Being serviced */
#define DD_STATUS_STS_NC 0x04 /* Normal completion */
#define DD_STATUS_STS_DUR 0x06 /* Data underrun (short packet) */
#define DD_STATUS_STS_DOR 0x08 /* Data overrun */
#define DD_STATUS_STS_SE 0x12 /* System error */
#define DD_STATUS_PKT_VAL 0x20 /* Packet valid */
#define DD_STATUS_LSB_EX 0x40 /* LS byte extracted (ATLE) */
#define DD_STATUS_MSB_EX 0x80 /* MS byte extracted (ATLE) */
#define DD_STATUS_MLEN(n) (((n) >> 8) & 0x3F)
#define DD_STATUS_CURDMACNT(n) (((n) >> 16) & 0xFFFF)
/*
*
* Protocol engine bits below
*
*/
/* Device Interrupt Bit Definitions */
#define FRAME_INT 0x00000001
#define EP_FAST_INT 0x00000002
#define EP_SLOW_INT 0x00000004
#define DEV_STAT_INT 0x00000008
#define CCEMTY_INT 0x00000010
#define CDFULL_INT 0x00000020
#define RxENDPKT_INT 0x00000040
#define TxENDPKT_INT 0x00000080
#define EP_RLZED_INT 0x00000100
#define ERR_INT 0x00000200
/* Rx & Tx Packet Length Definitions */
#define PKT_LNGTH_MASK 0x000003FF
#define PKT_DV 0x00000400
#define PKT_RDY 0x00000800
/* USB Control Definitions */
#define CTRL_RD_EN 0x00000001
#define CTRL_WR_EN 0x00000002
/* Command Codes */
#define CMD_SET_ADDR 0x00D00500
#define CMD_CFG_DEV 0x00D80500
#define CMD_SET_MODE 0x00F30500
#define CMD_RD_FRAME 0x00F50500
#define DAT_RD_FRAME 0x00F50200
#define CMD_RD_TEST 0x00FD0500
#define DAT_RD_TEST 0x00FD0200
#define CMD_SET_DEV_STAT 0x00FE0500
#define CMD_GET_DEV_STAT 0x00FE0500
#define DAT_GET_DEV_STAT 0x00FE0200
#define CMD_GET_ERR_CODE 0x00FF0500
#define DAT_GET_ERR_CODE 0x00FF0200
#define CMD_RD_ERR_STAT 0x00FB0500
#define DAT_RD_ERR_STAT 0x00FB0200
#define DAT_WR_BYTE(x) (0x00000100 | ((x) << 16))
#define CMD_SEL_EP(x) (0x00000500 | ((x) << 16))
#define DAT_SEL_EP(x) (0x00000200 | ((x) << 16))
#define CMD_SEL_EP_CLRI(x) (0x00400500 | ((x) << 16))
#define DAT_SEL_EP_CLRI(x) (0x00400200 | ((x) << 16))
#define CMD_SET_EP_STAT(x) (0x00400500 | ((x) << 16))
#define CMD_CLR_BUF 0x00F20500
#define DAT_CLR_BUF 0x00F20200
#define CMD_VALID_BUF 0x00FA0500
/* Device Address Register Definitions */
#define DEV_ADDR_MASK 0x7F
#define DEV_EN 0x80
/* Device Configure Register Definitions */
#define CONF_DVICE 0x01
/* Device Mode Register Definitions */
#define AP_CLK 0x01
#define INAK_CI 0x02
#define INAK_CO 0x04
#define INAK_II 0x08
#define INAK_IO 0x10
#define INAK_BI 0x20
#define INAK_BO 0x40
/* Device Status Register Definitions */
#define DEV_CON 0x01
#define DEV_CON_CH 0x02
#define DEV_SUS 0x04
#define DEV_SUS_CH 0x08
#define DEV_RST 0x10
/* Error Code Register Definitions */
#define ERR_EC_MASK 0x0F
#define ERR_EA 0x10
/* Error Status Register Definitions */
#define ERR_PID 0x01
#define ERR_UEPKT 0x02
#define ERR_DCRC 0x04
#define ERR_TIMOUT 0x08
#define ERR_EOP 0x10
#define ERR_B_OVRN 0x20
#define ERR_BTSTF 0x40
#define ERR_TGL 0x80
/* Endpoint Select Register Definitions */
#define EP_SEL_F 0x01
#define EP_SEL_ST 0x02
#define EP_SEL_STP 0x04
#define EP_SEL_PO 0x08
#define EP_SEL_EPN 0x10
#define EP_SEL_B_1_FULL 0x20
#define EP_SEL_B_2_FULL 0x40
/* Endpoint Status Register Definitions */
#define EP_STAT_ST 0x01
#define EP_STAT_DA 0x20
#define EP_STAT_RF_MO 0x40
#define EP_STAT_CND_ST 0x80
/* Clear Buffer Register Definitions */
#define CLR_BUF_PO 0x01
/* DMA Interrupt Bit Definitions */
#define EOT_INT 0x01
#define NDD_REQ_INT 0x02
#define SYS_ERR_INT 0x04
#define DRIVER_VERSION "1.03"
static const char driver_name[] = "lpc32xx_udc";
/*
*
* proc interface support
*
*/
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
static char *epnames[] = {"INT", "ISO", "BULK", "CTRL"};
static const char debug_filename[] = "driver/udc";
static void proc_ep_show(struct seq_file *s, struct lpc32xx_ep *ep)
{
struct lpc32xx_request *req;
seq_printf(s, "\n");
seq_printf(s, "%12s, maxpacket %4d %3s",
ep->ep.name, ep->ep.maxpacket,
ep->is_in ? "in" : "out");
seq_printf(s, " type %4s", epnames[ep->eptype]);
seq_printf(s, " ints: %12d", ep->totalints);
if (list_empty(&ep->queue))
seq_printf(s, "\t(queue empty)\n");
else {
list_for_each_entry(req, &ep->queue, queue) {
u32 length = req->req.actual;
seq_printf(s, "\treq %p len %d/%d buf %p\n",
&req->req, length,
req->req.length, req->req.buf);
}
}
}
static int proc_udc_show(struct seq_file *s, void *unused)
{
struct lpc32xx_udc *udc = s->private;
struct lpc32xx_ep *ep;
unsigned long flags;
seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
spin_lock_irqsave(&udc->lock, flags);
seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
udc->vbus ? "present" : "off",
udc->enabled ? (udc->vbus ? "active" : "enabled") :
"disabled",
udc->selfpowered ? "self" : "VBUS",
udc->suspended ? ", suspended" : "",
udc->driver ? udc->driver->driver.name : "(none)");
if (udc->enabled && udc->vbus) {
proc_ep_show(s, &udc->ep[0]);
list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list)
proc_ep_show(s, ep);
}
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
static int proc_udc_open(struct inode *inode, struct file *file)
{
return single_open(file, proc_udc_show, PDE_DATA(inode));
}
static const struct file_operations proc_ops = {
.owner = THIS_MODULE,
.open = proc_udc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void create_debug_file(struct lpc32xx_udc *udc)
{
udc->pde = debugfs_create_file(debug_filename, 0, NULL, udc, &proc_ops);
}
static void remove_debug_file(struct lpc32xx_udc *udc)
{
if (udc->pde)
debugfs_remove(udc->pde);
}
#else
static inline void create_debug_file(struct lpc32xx_udc *udc) {}
static inline void remove_debug_file(struct lpc32xx_udc *udc) {}
#endif
/* Primary initialization sequence for the ISP1301 transceiver */
static void isp1301_udc_configure(struct lpc32xx_udc *udc)
{
/* LPC32XX only supports DAT_SE0 USB mode */
/* This sequence is important */
/* Disable transparent UART mode first */
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
(ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
MC1_UART_EN);
/* Set full speed and SE0 mode */
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
(ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR), ~0);
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_MODE_CONTROL_1, (MC1_SPEED_REG | MC1_DAT_SE0));
/*
* The PSW_OE enable bit state is reversed in the ISP1301 User's Guide
*/
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
(ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR), ~0);
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_MODE_CONTROL_2, (MC2_BI_DI | MC2_SPD_SUSP_CTRL));
/* Driver VBUS_DRV high or low depending on board setup */
if (udc->board->vbus_drv_pol != 0)
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
else
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR,
OTG1_VBUS_DRV);
/* Bi-directional mode with suspend control
* Enable both pulldowns for now - the pullup will be enable when VBUS
* is detected */
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
(ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR), ~0);
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_OTG_CONTROL_1,
(0 | OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
/* Discharge VBUS (just in case) */
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DISCHRG);
msleep(1);
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
(ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
OTG1_VBUS_DISCHRG);
/* Clear and enable VBUS high edge interrupt */
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_INTERRUPT_FALLING, INT_VBUS_VLD);
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_INTERRUPT_RISING, INT_VBUS_VLD);
/* Enable usb_need_clk clock after transceiver is initialized */
writel((readl(USB_CTRL) | USB_DEV_NEED_CLK_EN), USB_CTRL);
dev_info(udc->dev, "ISP1301 Vendor ID : 0x%04x\n",
i2c_smbus_read_word_data(udc->isp1301_i2c_client, 0x00));
dev_info(udc->dev, "ISP1301 Product ID : 0x%04x\n",
i2c_smbus_read_word_data(udc->isp1301_i2c_client, 0x02));
dev_info(udc->dev, "ISP1301 Version ID : 0x%04x\n",
i2c_smbus_read_word_data(udc->isp1301_i2c_client, 0x14));
}
/* Enables or disables the USB device pullup via the ISP1301 transceiver */
static void isp1301_pullup_set(struct lpc32xx_udc *udc)
{
if (udc->pullup)
/* Enable pullup for bus signalling */
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_OTG_CONTROL_1, OTG1_DP_PULLUP);
else
/* Enable pullup for bus signalling */
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR,
OTG1_DP_PULLUP);
}
static void pullup_work(struct work_struct *work)
{
struct lpc32xx_udc *udc =
container_of(work, struct lpc32xx_udc, pullup_job);
isp1301_pullup_set(udc);
}
static void isp1301_pullup_enable(struct lpc32xx_udc *udc, int en_pullup,
int block)
{
if (en_pullup == udc->pullup)
return;
udc->pullup = en_pullup;
if (block)
isp1301_pullup_set(udc);
else
/* defer slow i2c pull up setting */
schedule_work(&udc->pullup_job);
}
#ifdef CONFIG_PM
/* Powers up or down the ISP1301 transceiver */
static void isp1301_set_powerstate(struct lpc32xx_udc *udc, int enable)
{
if (enable != 0)
/* Power up ISP1301 - this ISP1301 will automatically wakeup
when VBUS is detected */
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR,
MC2_GLOBAL_PWR_DN);
else
/* Power down ISP1301 */
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
}
static void power_work(struct work_struct *work)
{
struct lpc32xx_udc *udc =
container_of(work, struct lpc32xx_udc, power_job);
isp1301_set_powerstate(udc, udc->poweron);
}
#endif
/*
*
* USB protocol engine command/data read/write helper functions
*
*/
/* Issues a single command to the USB device state machine */
static void udc_protocol_cmd_w(struct lpc32xx_udc *udc, u32 cmd)
{
u32 pass = 0;
int to;
/* EP may lock on CLRI if this read isn't done */
u32 tmp = readl(USBD_DEVINTST(udc->udp_baseaddr));
(void) tmp;
while (pass == 0) {
writel(USBD_CCEMPTY, USBD_DEVINTCLR(udc->udp_baseaddr));
/* Write command code */
writel(cmd, USBD_CMDCODE(udc->udp_baseaddr));
to = 10000;
while (((readl(USBD_DEVINTST(udc->udp_baseaddr)) &
USBD_CCEMPTY) == 0) && (to > 0)) {
to--;
}
if (to > 0)
pass = 1;
cpu_relax();
}
}
/* Issues 2 commands (or command and data) to the USB device state machine */
static inline void udc_protocol_cmd_data_w(struct lpc32xx_udc *udc, u32 cmd,
u32 data)
{
udc_protocol_cmd_w(udc, cmd);
udc_protocol_cmd_w(udc, data);
}
/* Issues a single command to the USB device state machine and reads
* response data */
static u32 udc_protocol_cmd_r(struct lpc32xx_udc *udc, u32 cmd)
{
u32 tmp;
int to = 1000;
/* Write a command and read data from the protocol engine */
writel((USBD_CDFULL | USBD_CCEMPTY),
USBD_DEVINTCLR(udc->udp_baseaddr));
/* Write command code */
udc_protocol_cmd_w(udc, cmd);
tmp = readl(USBD_DEVINTST(udc->udp_baseaddr));
while ((!(readl(USBD_DEVINTST(udc->udp_baseaddr)) & USBD_CDFULL))
&& (to > 0))
to--;
if (!to)
dev_dbg(udc->dev,
"Protocol engine didn't receive response (CDFULL)\n");
return readl(USBD_CMDDATA(udc->udp_baseaddr));
}
/*
*
* USB device interrupt mask support functions
*
*/
/* Enable one or more USB device interrupts */
static inline void uda_enable_devint(struct lpc32xx_udc *udc, u32 devmask)
{
udc->enabled_devints |= devmask;
writel(udc->enabled_devints, USBD_DEVINTEN(udc->udp_baseaddr));
}
/* Disable one or more USB device interrupts */
static inline void uda_disable_devint(struct lpc32xx_udc *udc, u32 mask)
{
udc->enabled_devints &= ~mask;
writel(udc->enabled_devints, USBD_DEVINTEN(udc->udp_baseaddr));
}
/* Clear one or more USB device interrupts */
static inline void uda_clear_devint(struct lpc32xx_udc *udc, u32 mask)
{
writel(mask, USBD_DEVINTCLR(udc->udp_baseaddr));
}
/*
*
* Endpoint interrupt disable/enable functions
*
*/
/* Enable one or more USB endpoint interrupts */
static void uda_enable_hwepint(struct lpc32xx_udc *udc, u32 hwep)
{
udc->enabled_hwepints |= (1 << hwep);
writel(udc->enabled_hwepints, USBD_EPINTEN(udc->udp_baseaddr));
}
/* Disable one or more USB endpoint interrupts */
static void uda_disable_hwepint(struct lpc32xx_udc *udc, u32 hwep)
{
udc->enabled_hwepints &= ~(1 << hwep);
writel(udc->enabled_hwepints, USBD_EPINTEN(udc->udp_baseaddr));
}
/* Clear one or more USB endpoint interrupts */
static inline void uda_clear_hwepint(struct lpc32xx_udc *udc, u32 hwep)
{
writel((1 << hwep), USBD_EPINTCLR(udc->udp_baseaddr));
}
/* Enable DMA for the HW channel */
static inline void udc_ep_dma_enable(struct lpc32xx_udc *udc, u32 hwep)
{
writel((1 << hwep), USBD_EPDMAEN(udc->udp_baseaddr));
}
/* Disable DMA for the HW channel */
static inline void udc_ep_dma_disable(struct lpc32xx_udc *udc, u32 hwep)
{
writel((1 << hwep), USBD_EPDMADIS(udc->udp_baseaddr));
}
/*
*
* Endpoint realize/unrealize functions
*
*/
/* Before an endpoint can be used, it needs to be realized
* in the USB protocol engine - this realizes the endpoint.
* The interrupt (FIFO or DMA) is not enabled with this function */
static void udc_realize_hwep(struct lpc32xx_udc *udc, u32 hwep,
u32 maxpacket)
{
int to = 1000;
writel(USBD_EP_RLZED, USBD_DEVINTCLR(udc->udp_baseaddr));
writel(hwep, USBD_EPIND(udc->udp_baseaddr));
udc->realized_eps |= (1 << hwep);
writel(udc->realized_eps, USBD_REEP(udc->udp_baseaddr));
writel(maxpacket, USBD_EPMAXPSIZE(udc->udp_baseaddr));
/* Wait until endpoint is realized in hardware */
while ((!(readl(USBD_DEVINTST(udc->udp_baseaddr)) &
USBD_EP_RLZED)) && (to > 0))
to--;
if (!to)
dev_dbg(udc->dev, "EP not correctly realized in hardware\n");
writel(USBD_EP_RLZED, USBD_DEVINTCLR(udc->udp_baseaddr));
}
/* Unrealize an EP */
static void udc_unrealize_hwep(struct lpc32xx_udc *udc, u32 hwep)
{
udc->realized_eps &= ~(1 << hwep);
writel(udc->realized_eps, USBD_REEP(udc->udp_baseaddr));
}
/*
*
* Endpoint support functions
*
*/
/* Select and clear endpoint interrupt */
static u32 udc_selep_clrint(struct lpc32xx_udc *udc, u32 hwep)
{
udc_protocol_cmd_w(udc, CMD_SEL_EP_CLRI(hwep));
return udc_protocol_cmd_r(udc, DAT_SEL_EP_CLRI(hwep));
}
/* Disables the endpoint in the USB protocol engine */
static void udc_disable_hwep(struct lpc32xx_udc *udc, u32 hwep)
{
udc_protocol_cmd_data_w(udc, CMD_SET_EP_STAT(hwep),
DAT_WR_BYTE(EP_STAT_DA));
}
/* Stalls the endpoint - endpoint will return STALL */
static void udc_stall_hwep(struct lpc32xx_udc *udc, u32 hwep)
{
udc_protocol_cmd_data_w(udc, CMD_SET_EP_STAT(hwep),
DAT_WR_BYTE(EP_STAT_ST));
}
/* Clear stall or reset endpoint */
static void udc_clrstall_hwep(struct lpc32xx_udc *udc, u32 hwep)
{
udc_protocol_cmd_data_w(udc, CMD_SET_EP_STAT(hwep),
DAT_WR_BYTE(0));
}
/* Select an endpoint for endpoint status, clear, validate */
static void udc_select_hwep(struct lpc32xx_udc *udc, u32 hwep)
{
udc_protocol_cmd_w(udc, CMD_SEL_EP(hwep));
}
/*
*
* Endpoint buffer management functions
*
*/
/* Clear the current endpoint's buffer */
static void udc_clr_buffer_hwep(struct lpc32xx_udc *udc, u32 hwep)
{
udc_select_hwep(udc, hwep);
udc_protocol_cmd_w(udc, CMD_CLR_BUF);
}
/* Validate the current endpoint's buffer */
static void udc_val_buffer_hwep(struct lpc32xx_udc *udc, u32 hwep)
{
udc_select_hwep(udc, hwep);
udc_protocol_cmd_w(udc, CMD_VALID_BUF);
}
static inline u32 udc_clearep_getsts(struct lpc32xx_udc *udc, u32 hwep)
{
/* Clear EP interrupt */
uda_clear_hwepint(udc, hwep);
return udc_selep_clrint(udc, hwep);
}
/*
*
* USB EP DMA support
*
*/
/* Allocate a DMA Descriptor */
static struct lpc32xx_usbd_dd_gad *udc_dd_alloc(struct lpc32xx_udc *udc)
{
dma_addr_t dma;
struct lpc32xx_usbd_dd_gad *dd;
dd = (struct lpc32xx_usbd_dd_gad *) dma_pool_alloc(
udc->dd_cache, (GFP_KERNEL | GFP_DMA), &dma);
if (dd)
dd->this_dma = dma;
return dd;
}
/* Free a DMA Descriptor */
static void udc_dd_free(struct lpc32xx_udc *udc, struct lpc32xx_usbd_dd_gad *dd)
{
dma_pool_free(udc->dd_cache, dd, dd->this_dma);
}
/*
*
* USB setup and shutdown functions
*
*/
/* Enables or disables most of the USB system clocks when low power mode is
* needed. Clocks are typically started on a connection event, and disabled
* when a cable is disconnected */
static void udc_clk_set(struct lpc32xx_udc *udc, int enable)
{
if (enable != 0) {
if (udc->clocked)
return;
udc->clocked = 1;
/* 48MHz PLL up */
clk_enable(udc->usb_pll_clk);
/* Enable the USB device clock */
writel(readl(USB_CTRL) | USB_DEV_NEED_CLK_EN,
USB_CTRL);
clk_enable(udc->usb_otg_clk);
} else {
if (!udc->clocked)
return;
udc->clocked = 0;
/* Never disable the USB_HCLK during normal operation */
/* 48MHz PLL dpwn */
clk_disable(udc->usb_pll_clk);
/* Disable the USB device clock */
writel(readl(USB_CTRL) & ~USB_DEV_NEED_CLK_EN,
USB_CTRL);
clk_disable(udc->usb_otg_clk);
}
}
/* Set/reset USB device address */
static void udc_set_address(struct lpc32xx_udc *udc, u32 addr)
{
/* Address will be latched at the end of the status phase, or
latched immediately if function is called twice */
udc_protocol_cmd_data_w(udc, CMD_SET_ADDR,
DAT_WR_BYTE(DEV_EN | addr));
}
/* Setup up a IN request for DMA transfer - this consists of determining the
* list of DMA addresses for the transfer, allocating DMA Descriptors,
* installing the DD into the UDCA, and then enabling the DMA for that EP */
static int udc_ep_in_req_dma(struct lpc32xx_udc *udc, struct lpc32xx_ep *ep)
{
struct lpc32xx_request *req;
u32 hwep = ep->hwep_num;
ep->req_pending = 1;
/* There will always be a request waiting here */
req = list_entry(ep->queue.next, struct lpc32xx_request, queue);
/* Place the DD Descriptor into the UDCA */
udc->udca_v_base[hwep] = req->dd_desc_ptr->this_dma;
/* Enable DMA and interrupt for the HW EP */
udc_ep_dma_enable(udc, hwep);
/* Clear ZLP if last packet is not of MAXP size */
if (req->req.length % ep->ep.maxpacket)
req->send_zlp = 0;
return 0;
}
/* Setup up a OUT request for DMA transfer - this consists of determining the
* list of DMA addresses for the transfer, allocating DMA Descriptors,
* installing the DD into the UDCA, and then enabling the DMA for that EP */
static int udc_ep_out_req_dma(struct lpc32xx_udc *udc, struct lpc32xx_ep *ep)
{
struct lpc32xx_request *req;
u32 hwep = ep->hwep_num;
ep->req_pending = 1;
/* There will always be a request waiting here */
req = list_entry(ep->queue.next, struct lpc32xx_request, queue);
/* Place the DD Descriptor into the UDCA */
udc->udca_v_base[hwep] = req->dd_desc_ptr->this_dma;
/* Enable DMA and interrupt for the HW EP */
udc_ep_dma_enable(udc, hwep);
return 0;
}
static void udc_disable(struct lpc32xx_udc *udc)
{
u32 i;
/* Disable device */
udc_protocol_cmd_data_w(udc, CMD_CFG_DEV, DAT_WR_BYTE(0));
udc_protocol_cmd_data_w(udc, CMD_SET_DEV_STAT, DAT_WR_BYTE(0));
/* Disable all device interrupts (including EP0) */
uda_disable_devint(udc, 0x3FF);
/* Disable and reset all endpoint interrupts */
for (i = 0; i < 32; i++) {
uda_disable_hwepint(udc, i);
uda_clear_hwepint(udc, i);
udc_disable_hwep(udc, i);
udc_unrealize_hwep(udc, i);
udc->udca_v_base[i] = 0;
/* Disable and clear all interrupts and DMA */
udc_ep_dma_disable(udc, i);
writel((1 << i), USBD_EOTINTCLR(udc->udp_baseaddr));
writel((1 << i), USBD_NDDRTINTCLR(udc->udp_baseaddr));
writel((1 << i), USBD_SYSERRTINTCLR(udc->udp_baseaddr));
writel((1 << i), USBD_DMARCLR(udc->udp_baseaddr));
}
/* Disable DMA interrupts */
writel(0, USBD_DMAINTEN(udc->udp_baseaddr));
writel(0, USBD_UDCAH(udc->udp_baseaddr));
}
static void udc_enable(struct lpc32xx_udc *udc)
{
u32 i;
struct lpc32xx_ep *ep = &udc->ep[0];
/* Start with known state */
udc_disable(udc);
/* Enable device */
udc_protocol_cmd_data_w(udc, CMD_SET_DEV_STAT, DAT_WR_BYTE(DEV_CON));
/* EP interrupts on high priority, FRAME interrupt on low priority */
writel(USBD_EP_FAST, USBD_DEVINTPRI(udc->udp_baseaddr));
writel(0xFFFF, USBD_EPINTPRI(udc->udp_baseaddr));
/* Clear any pending device interrupts */
writel(0x3FF, USBD_DEVINTCLR(udc->udp_baseaddr));
/* Setup UDCA - not yet used (DMA) */
writel(udc->udca_p_base, USBD_UDCAH(udc->udp_baseaddr));
/* Only enable EP0 in and out for now, EP0 only works in FIFO mode */
for (i = 0; i <= 1; i++) {
udc_realize_hwep(udc, i, ep->ep.maxpacket);
uda_enable_hwepint(udc, i);
udc_select_hwep(udc, i);
udc_clrstall_hwep(udc, i);
udc_clr_buffer_hwep(udc, i);
}
/* Device interrupt setup */
uda_clear_devint(udc, (USBD_ERR_INT | USBD_DEV_STAT | USBD_EP_SLOW |
USBD_EP_FAST));
uda_enable_devint(udc, (USBD_ERR_INT | USBD_DEV_STAT | USBD_EP_SLOW |
USBD_EP_FAST));
/* Set device address to 0 - called twice to force a latch in the USB
engine without the need of a setup packet status closure */
udc_set_address(udc, 0);
udc_set_address(udc, 0);
/* Enable master DMA interrupts */
writel((USBD_SYS_ERR_INT | USBD_EOT_INT),
USBD_DMAINTEN(udc->udp_baseaddr));
udc->dev_status = 0;
}
/*
*
* USB device board specific events handled via callbacks
*
*/
/* Connection change event - notify board function of change */
static void uda_power_event(struct lpc32xx_udc *udc, u32 conn)
{
/* Just notify of a connection change event (optional) */
if (udc->board->conn_chgb != NULL)
udc->board->conn_chgb(conn);
}
/* Suspend/resume event - notify board function of change */
static void uda_resm_susp_event(struct lpc32xx_udc *udc, u32 conn)
{
/* Just notify of a Suspend/resume change event (optional) */
if (udc->board->susp_chgb != NULL)
udc->board->susp_chgb(conn);
if (conn)
udc->suspended = 0;
else
udc->suspended = 1;
}
/* Remote wakeup enable/disable - notify board function of change */
static void uda_remwkp_cgh(struct lpc32xx_udc *udc)
{
if (udc->board->rmwk_chgb != NULL)
udc->board->rmwk_chgb(udc->dev_status &
(1 << USB_DEVICE_REMOTE_WAKEUP));
}
/* Reads data from FIFO, adjusts for alignment and data size */
static void udc_pop_fifo(struct lpc32xx_udc *udc, u8 *data, u32 bytes)
{
int n, i, bl;
u16 *p16;
u32 *p32, tmp, cbytes;
/* Use optimal data transfer method based on source address and size */
switch (((u32) data) & 0x3) {
case 0: /* 32-bit aligned */
p32 = (u32 *) data;
cbytes = (bytes & ~0x3);
/* Copy 32-bit aligned data first */
for (n = 0; n < cbytes; n += 4)
*p32++ = readl(USBD_RXDATA(udc->udp_baseaddr));
/* Handle any remaining bytes */
bl = bytes - cbytes;
if (bl) {
tmp = readl(USBD_RXDATA(udc->udp_baseaddr));
for (n = 0; n < bl; n++)
data[cbytes + n] = ((tmp >> (n * 8)) & 0xFF);
}
break;
case 1: /* 8-bit aligned */
case 3:
/* Each byte has to be handled independently */
for (n = 0; n < bytes; n += 4) {
tmp = readl(USBD_RXDATA(udc->udp_baseaddr));
bl = bytes - n;
if (bl > 3)
bl = 3;
for (i = 0; i < bl; i++)
data[n + i] = (u8) ((tmp >> (n * 8)) & 0xFF);
}
break;
case 2: /* 16-bit aligned */
p16 = (u16 *) data;
cbytes = (bytes & ~0x3);
/* Copy 32-bit sized objects first with 16-bit alignment */
for (n = 0; n < cbytes; n += 4) {
tmp = readl(USBD_RXDATA(udc->udp_baseaddr));
*p16++ = (u16)(tmp & 0xFFFF);
*p16++ = (u16)((tmp >> 16) & 0xFFFF);
}
/* Handle any remaining bytes */
bl = bytes - cbytes;
if (bl) {
tmp = readl(USBD_RXDATA(udc->udp_baseaddr));
for (n = 0; n < bl; n++)
data[cbytes + n] = ((tmp >> (n * 8)) & 0xFF);
}
break;
}
}
/* Read data from the FIFO for an endpoint. This function is for endpoints (such
* as EP0) that don't use DMA. This function should only be called if a packet
* is known to be ready to read for the endpoint. Note that the endpoint must
* be selected in the protocol engine prior to this call. */
static u32 udc_read_hwep(struct lpc32xx_udc *udc, u32 hwep, u32 *data,
u32 bytes)
{
u32 tmpv;
int to = 1000;
u32 tmp, hwrep = ((hwep & 0x1E) << 1) | CTRL_RD_EN;
/* Setup read of endpoint */
writel(hwrep, USBD_CTRL(udc->udp_baseaddr));
/* Wait until packet is ready */
while ((((tmpv = readl(USBD_RXPLEN(udc->udp_baseaddr))) &
PKT_RDY) == 0) && (to > 0))
to--;
if (!to)
dev_dbg(udc->dev, "No packet ready on FIFO EP read\n");
/* Mask out count */
tmp = tmpv & PKT_LNGTH_MASK;
if (bytes < tmp)
tmp = bytes;
if ((tmp > 0) && (data != NULL))
udc_pop_fifo(udc, (u8 *) data, tmp);
writel(((hwep & 0x1E) << 1), USBD_CTRL(udc->udp_baseaddr));
/* Clear the buffer */
udc_clr_buffer_hwep(udc, hwep);
return tmp;
}
/* Stuffs data into the FIFO, adjusts for alignment and data size */
static void udc_stuff_fifo(struct lpc32xx_udc *udc, u8 *data, u32 bytes)
{
int n, i, bl;
u16 *p16;
u32 *p32, tmp, cbytes;
/* Use optimal data transfer method based on source address and size */
switch (((u32) data) & 0x3) {
case 0: /* 32-bit aligned */
p32 = (u32 *) data;
cbytes = (bytes & ~0x3);
/* Copy 32-bit aligned data first */
for (n = 0; n < cbytes; n += 4)
writel(*p32++, USBD_TXDATA(udc->udp_baseaddr));
/* Handle any remaining bytes */
bl = bytes - cbytes;
if (bl) {
tmp = 0;
for (n = 0; n < bl; n++)
tmp |= data[cbytes + n] << (n * 8);
writel(tmp, USBD_TXDATA(udc->udp_baseaddr));
}
break;
case 1: /* 8-bit aligned */
case 3:
/* Each byte has to be handled independently */
for (n = 0; n < bytes; n += 4) {
bl = bytes - n;
if (bl > 4)
bl = 4;
tmp = 0;
for (i = 0; i < bl; i++)
tmp |= data[n + i] << (i * 8);
writel(tmp, USBD_TXDATA(udc->udp_baseaddr));
}
break;
case 2: /* 16-bit aligned */
p16 = (u16 *) data;
cbytes = (bytes & ~0x3);
/* Copy 32-bit aligned data first */
for (n = 0; n < cbytes; n += 4) {
tmp = *p16++ & 0xFFFF;
tmp |= (*p16++ & 0xFFFF) << 16;
writel(tmp, USBD_TXDATA(udc->udp_baseaddr));
}
/* Handle any remaining bytes */
bl = bytes - cbytes;
if (bl) {
tmp = 0;
for (n = 0; n < bl; n++)
tmp |= data[cbytes + n] << (n * 8);
writel(tmp, USBD_TXDATA(udc->udp_baseaddr));
}
break;
}
}
/* Write data to the FIFO for an endpoint. This function is for endpoints (such
* as EP0) that don't use DMA. Note that the endpoint must be selected in the
* protocol engine prior to this call. */
static void udc_write_hwep(struct lpc32xx_udc *udc, u32 hwep, u32 *data,
u32 bytes)
{
u32 hwwep = ((hwep & 0x1E) << 1) | CTRL_WR_EN;
if ((bytes > 0) && (data == NULL))
return;
/* Setup write of endpoint */
writel(hwwep, USBD_CTRL(udc->udp_baseaddr));
writel(bytes, USBD_TXPLEN(udc->udp_baseaddr));
/* Need at least 1 byte to trigger TX */
if (bytes == 0)
writel(0, USBD_TXDATA(udc->udp_baseaddr));
else
udc_stuff_fifo(udc, (u8 *) data, bytes);
writel(((hwep & 0x1E) << 1), USBD_CTRL(udc->udp_baseaddr));
udc_val_buffer_hwep(udc, hwep);
}
/* USB device reset - resets USB to a default state with just EP0
enabled */
static void uda_usb_reset(struct lpc32xx_udc *udc)
{
u32 i = 0;
/* Re-init device controller and EP0 */
udc_enable(udc);
udc->gadget.speed = USB_SPEED_FULL;
for (i = 1; i < NUM_ENDPOINTS; i++) {
struct lpc32xx_ep *ep = &udc->ep[i];
ep->req_pending = 0;
}
}
/* Send a ZLP on EP0 */
static void udc_ep0_send_zlp(struct lpc32xx_udc *udc)
{
udc_write_hwep(udc, EP_IN, NULL, 0);
}
/* Get current frame number */
static u16 udc_get_current_frame(struct lpc32xx_udc *udc)
{
u16 flo, fhi;
udc_protocol_cmd_w(udc, CMD_RD_FRAME);
flo = (u16) udc_protocol_cmd_r(udc, DAT_RD_FRAME);
fhi = (u16) udc_protocol_cmd_r(udc, DAT_RD_FRAME);
return (fhi << 8) | flo;
}
/* Set the device as configured - enables all endpoints */
static inline void udc_set_device_configured(struct lpc32xx_udc *udc)
{
udc_protocol_cmd_data_w(udc, CMD_CFG_DEV, DAT_WR_BYTE(CONF_DVICE));
}
/* Set the device as unconfigured - disables all endpoints */
static inline void udc_set_device_unconfigured(struct lpc32xx_udc *udc)
{
udc_protocol_cmd_data_w(udc, CMD_CFG_DEV, DAT_WR_BYTE(0));
}
/* reinit == restore initial software state */
static void udc_reinit(struct lpc32xx_udc *udc)
{
u32 i;
INIT_LIST_HEAD(&udc->gadget.ep_list);
INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
for (i = 0; i < NUM_ENDPOINTS; i++) {
struct lpc32xx_ep *ep = &udc->ep[i];
if (i != 0)
list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket);
INIT_LIST_HEAD(&ep->queue);
ep->req_pending = 0;
}
udc->ep0state = WAIT_FOR_SETUP;
}
/* Must be called with lock */
static void done(struct lpc32xx_ep *ep, struct lpc32xx_request *req, int status)
{
struct lpc32xx_udc *udc = ep->udc;
list_del_init(&req->queue);
if (req->req.status == -EINPROGRESS)
req->req.status = status;
else
status = req->req.status;
if (ep->lep) {
usb_gadget_unmap_request(&udc->gadget, &req->req, ep->is_in);
/* Free DDs */
udc_dd_free(udc, req->dd_desc_ptr);
}
if (status && status != -ESHUTDOWN)
ep_dbg(ep, "%s done %p, status %d\n", ep->ep.name, req, status);
ep->req_pending = 0;
spin_unlock(&udc->lock);
req->req.complete(&ep->ep, &req->req);
spin_lock(&udc->lock);
}
/* Must be called with lock */
static void nuke(struct lpc32xx_ep *ep, int status)
{
struct lpc32xx_request *req;
while (!list_empty(&ep->queue)) {
req = list_entry(ep->queue.next, struct lpc32xx_request, queue);
done(ep, req, status);
}
if (status == -ESHUTDOWN) {
uda_disable_hwepint(ep->udc, ep->hwep_num);
udc_disable_hwep(ep->udc, ep->hwep_num);
}
}
/* IN endpoint 0 transfer */
static int udc_ep0_in_req(struct lpc32xx_udc *udc)
{
struct lpc32xx_request *req;
struct lpc32xx_ep *ep0 = &udc->ep[0];
u32 tsend, ts = 0;
if (list_empty(&ep0->queue))
/* Nothing to send */
return 0;
else
req = list_entry(ep0->queue.next, struct lpc32xx_request,
queue);
tsend = ts = req->req.length - req->req.actual;
if (ts == 0) {
/* Send a ZLP */
udc_ep0_send_zlp(udc);
done(ep0, req, 0);
return 1;
} else if (ts > ep0->ep.maxpacket)
ts = ep0->ep.maxpacket; /* Just send what we can */
/* Write data to the EP0 FIFO and start transfer */
udc_write_hwep(udc, EP_IN, (req->req.buf + req->req.actual), ts);
/* Increment data pointer */
req->req.actual += ts;
if (tsend >= ep0->ep.maxpacket)
return 0; /* Stay in data transfer state */
/* Transfer request is complete */
udc->ep0state = WAIT_FOR_SETUP;
done(ep0, req, 0);
return 1;
}
/* OUT endpoint 0 transfer */
static int udc_ep0_out_req(struct lpc32xx_udc *udc)
{
struct lpc32xx_request *req;
struct lpc32xx_ep *ep0 = &udc->ep[0];
u32 tr, bufferspace;
if (list_empty(&ep0->queue))
return 0;
else
req = list_entry(ep0->queue.next, struct lpc32xx_request,
queue);
if (req) {
if (req->req.length == 0) {
/* Just dequeue request */
done(ep0, req, 0);
udc->ep0state = WAIT_FOR_SETUP;
return 1;
}
/* Get data from FIFO */
bufferspace = req->req.length - req->req.actual;
if (bufferspace > ep0->ep.maxpacket)
bufferspace = ep0->ep.maxpacket;
/* Copy data to buffer */
prefetchw(req->req.buf + req->req.actual);
tr = udc_read_hwep(udc, EP_OUT, req->req.buf + req->req.actual,
bufferspace);
req->req.actual += bufferspace;
if (tr < ep0->ep.maxpacket) {
/* This is the last packet */
done(ep0, req, 0);
udc->ep0state = WAIT_FOR_SETUP;
return 1;
}
}
return 0;
}
/* Must be called with lock */
static void stop_activity(struct lpc32xx_udc *udc)
{
struct usb_gadget_driver *driver = udc->driver;
int i;
if (udc->gadget.speed == USB_SPEED_UNKNOWN)
driver = NULL;
udc->gadget.speed = USB_SPEED_UNKNOWN;
udc->suspended = 0;
for (i = 0; i < NUM_ENDPOINTS; i++) {
struct lpc32xx_ep *ep = &udc->ep[i];
nuke(ep, -ESHUTDOWN);
}
if (driver) {
spin_unlock(&udc->lock);
driver->disconnect(&udc->gadget);
spin_lock(&udc->lock);
}
isp1301_pullup_enable(udc, 0, 0);
udc_disable(udc);
udc_reinit(udc);
}
/*
* Activate or kill host pullup
* Can be called with or without lock
*/
static void pullup(struct lpc32xx_udc *udc, int is_on)
{
if (!udc->clocked)
return;
if (!udc->enabled || !udc->vbus)
is_on = 0;
if (is_on != udc->pullup)
isp1301_pullup_enable(udc, is_on, 0);
}
/* Must be called without lock */
static int lpc32xx_ep_disable(struct usb_ep *_ep)
{
struct lpc32xx_ep *ep = container_of(_ep, struct lpc32xx_ep, ep);
struct lpc32xx_udc *udc = ep->udc;
unsigned long flags;
if ((ep->hwep_num_base == 0) || (ep->hwep_num == 0))
return -EINVAL;
spin_lock_irqsave(&udc->lock, flags);
nuke(ep, -ESHUTDOWN);
/* Clear all DMA statuses for this EP */
udc_ep_dma_disable(udc, ep->hwep_num);
writel(1 << ep->hwep_num, USBD_EOTINTCLR(udc->udp_baseaddr));
writel(1 << ep->hwep_num, USBD_NDDRTINTCLR(udc->udp_baseaddr));
writel(1 << ep->hwep_num, USBD_SYSERRTINTCLR(udc->udp_baseaddr));
writel(1 << ep->hwep_num, USBD_DMARCLR(udc->udp_baseaddr));
/* Remove the DD pointer in the UDCA */
udc->udca_v_base[ep->hwep_num] = 0;
/* Disable and reset endpoint and interrupt */
uda_clear_hwepint(udc, ep->hwep_num);
udc_unrealize_hwep(udc, ep->hwep_num);
ep->hwep_num = 0;
spin_unlock_irqrestore(&udc->lock, flags);
atomic_dec(&udc->enabled_ep_cnt);
wake_up(&udc->ep_disable_wait_queue);
return 0;
}
/* Must be called without lock */
static int lpc32xx_ep_enable(struct usb_ep *_ep,
const struct usb_endpoint_descriptor *desc)
{
struct lpc32xx_ep *ep = container_of(_ep, struct lpc32xx_ep, ep);
struct lpc32xx_udc *udc = ep->udc;
u16 maxpacket;
u32 tmp;
unsigned long flags;
/* Verify EP data */
if ((!_ep) || (!ep) || (!desc) ||
(desc->bDescriptorType != USB_DT_ENDPOINT)) {
dev_dbg(udc->dev, "bad ep or descriptor\n");
return -EINVAL;
}
maxpacket = usb_endpoint_maxp(desc);
if ((maxpacket == 0) || (maxpacket > ep->maxpacket)) {
dev_dbg(udc->dev, "bad ep descriptor's packet size\n");
return -EINVAL;
}
/* Don't touch EP0 */
if (ep->hwep_num_base == 0) {
dev_dbg(udc->dev, "Can't re-enable EP0!!!\n");
return -EINVAL;
}
/* Is driver ready? */
if ((!udc->driver) || (udc->gadget.speed == USB_SPEED_UNKNOWN)) {
dev_dbg(udc->dev, "bogus device state\n");
return -ESHUTDOWN;
}
tmp = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
switch (tmp) {
case USB_ENDPOINT_XFER_CONTROL:
return -EINVAL;
case USB_ENDPOINT_XFER_INT:
if (maxpacket > ep->maxpacket) {
dev_dbg(udc->dev,
"Bad INT endpoint maxpacket %d\n", maxpacket);
return -EINVAL;
}
break;
case USB_ENDPOINT_XFER_BULK:
switch (maxpacket) {
case 8:
case 16:
case 32:
case 64:
break;
default:
dev_dbg(udc->dev,
"Bad BULK endpoint maxpacket %d\n", maxpacket);
return -EINVAL;
}
break;
case USB_ENDPOINT_XFER_ISOC:
break;
}
spin_lock_irqsave(&udc->lock, flags);
/* Initialize endpoint to match the selected descriptor */
ep->is_in = (desc->bEndpointAddress & USB_DIR_IN) != 0;
ep->ep.maxpacket = maxpacket;
/* Map hardware endpoint from base and direction */
if (ep->is_in)
/* IN endpoints are offset 1 from the OUT endpoint */
ep->hwep_num = ep->hwep_num_base + EP_IN;
else
ep->hwep_num = ep->hwep_num_base;
ep_dbg(ep, "EP enabled: %s, HW:%d, MP:%d IN:%d\n", ep->ep.name,
ep->hwep_num, maxpacket, (ep->is_in == 1));
/* Realize the endpoint, interrupt is enabled later when
* buffers are queued, IN EPs will NAK until buffers are ready */
udc_realize_hwep(udc, ep->hwep_num, ep->ep.maxpacket);
udc_clr_buffer_hwep(udc, ep->hwep_num);
uda_disable_hwepint(udc, ep->hwep_num);
udc_clrstall_hwep(udc, ep->hwep_num);
/* Clear all DMA statuses for this EP */
udc_ep_dma_disable(udc, ep->hwep_num);
writel(1 << ep->hwep_num, USBD_EOTINTCLR(udc->udp_baseaddr));
writel(1 << ep->hwep_num, USBD_NDDRTINTCLR(udc->udp_baseaddr));
writel(1 << ep->hwep_num, USBD_SYSERRTINTCLR(udc->udp_baseaddr));
writel(1 << ep->hwep_num, USBD_DMARCLR(udc->udp_baseaddr));
spin_unlock_irqrestore(&udc->lock, flags);
atomic_inc(&udc->enabled_ep_cnt);
return 0;
}
/*
* Allocate a USB request list
* Can be called with or without lock
*/
static struct usb_request *lpc32xx_ep_alloc_request(struct usb_ep *_ep,
gfp_t gfp_flags)
{
struct lpc32xx_request *req;
req = kzalloc(sizeof(struct lpc32xx_request), gfp_flags);
if (!req)
return NULL;
INIT_LIST_HEAD(&req->queue);
return &req->req;
}
/*
* De-allocate a USB request list
* Can be called with or without lock
*/
static void lpc32xx_ep_free_request(struct usb_ep *_ep,
struct usb_request *_req)
{
struct lpc32xx_request *req;
req = container_of(_req, struct lpc32xx_request, req);
BUG_ON(!list_empty(&req->queue));
kfree(req);
}
/* Must be called without lock */
static int lpc32xx_ep_queue(struct usb_ep *_ep,
struct usb_request *_req, gfp_t gfp_flags)
{
struct lpc32xx_request *req;
struct lpc32xx_ep *ep;
struct lpc32xx_udc *udc;
unsigned long flags;
int status = 0;
req = container_of(_req, struct lpc32xx_request, req);
ep = container_of(_ep, struct lpc32xx_ep, ep);
if (!_req || !_req->complete || !_req->buf ||
!list_empty(&req->queue))
return -EINVAL;
udc = ep->udc;
if (!_ep) {
dev_dbg(udc->dev, "invalid ep\n");
return -EINVAL;
}
if ((!udc) || (!udc->driver) ||
(udc->gadget.speed == USB_SPEED_UNKNOWN)) {
dev_dbg(udc->dev, "invalid device\n");
return -EINVAL;
}
if (ep->lep) {
struct lpc32xx_usbd_dd_gad *dd;
status = usb_gadget_map_request(&udc->gadget, _req, ep->is_in);
if (status)
return status;
/* For the request, build a list of DDs */
dd = udc_dd_alloc(udc);
if (!dd) {
/* Error allocating DD */
return -ENOMEM;
}
req->dd_desc_ptr = dd;
/* Setup the DMA descriptor */
dd->dd_next_phy = dd->dd_next_v = 0;
dd->dd_buffer_addr = req->req.dma;
dd->dd_status = 0;
/* Special handling for ISO EPs */
if (ep->eptype == EP_ISO_TYPE) {
dd->dd_setup = DD_SETUP_ISO_EP |
DD_SETUP_PACKETLEN(0) |
DD_SETUP_DMALENBYTES(1);
dd->dd_iso_ps_mem_addr = dd->this_dma + 24;
if (ep->is_in)
dd->iso_status[0] = req->req.length;
else
dd->iso_status[0] = 0;
} else
dd->dd_setup = DD_SETUP_PACKETLEN(ep->ep.maxpacket) |
DD_SETUP_DMALENBYTES(req->req.length);
}
ep_dbg(ep, "%s queue req %p len %d buf %p (in=%d) z=%d\n", _ep->name,
_req, _req->length, _req->buf, ep->is_in, _req->zero);
spin_lock_irqsave(&udc->lock, flags);
_req->status = -EINPROGRESS;
_req->actual = 0;
req->send_zlp = _req->zero;
/* Kickstart empty queues */
if (list_empty(&ep->queue)) {
list_add_tail(&req->queue, &ep->queue);
if (ep->hwep_num_base == 0) {
/* Handle expected data direction */
if (ep->is_in) {
/* IN packet to host */
udc->ep0state = DATA_IN;
status = udc_ep0_in_req(udc);
} else {
/* OUT packet from host */
udc->ep0state = DATA_OUT;
status = udc_ep0_out_req(udc);
}
} else if (ep->is_in) {
/* IN packet to host and kick off transfer */
if (!ep->req_pending)
udc_ep_in_req_dma(udc, ep);
} else
/* OUT packet from host and kick off list */
if (!ep->req_pending)
udc_ep_out_req_dma(udc, ep);
} else
list_add_tail(&req->queue, &ep->queue);
spin_unlock_irqrestore(&udc->lock, flags);
return (status < 0) ? status : 0;
}
/* Must be called without lock */
static int lpc32xx_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
struct lpc32xx_ep *ep;
struct lpc32xx_request *req;
unsigned long flags;
ep = container_of(_ep, struct lpc32xx_ep, ep);
if (!_ep || ep->hwep_num_base == 0)
return -EINVAL;
spin_lock_irqsave(&ep->udc->lock, flags);
/* make sure it's actually queued on this endpoint */
list_for_each_entry(req, &ep->queue, queue) {
if (&req->req == _req)
break;
}
if (&req->req != _req) {
spin_unlock_irqrestore(&ep->udc->lock, flags);
return -EINVAL;
}
done(ep, req, -ECONNRESET);
spin_unlock_irqrestore(&ep->udc->lock, flags);
return 0;
}
/* Must be called without lock */
static int lpc32xx_ep_set_halt(struct usb_ep *_ep, int value)
{
struct lpc32xx_ep *ep = container_of(_ep, struct lpc32xx_ep, ep);
struct lpc32xx_udc *udc = ep->udc;
unsigned long flags;
if ((!ep) || (ep->hwep_num <= 1))
return -EINVAL;
/* Don't halt an IN EP */
if (ep->is_in)
return -EAGAIN;
spin_lock_irqsave(&udc->lock, flags);
if (value == 1) {
/* stall */
udc_protocol_cmd_data_w(udc, CMD_SET_EP_STAT(ep->hwep_num),
DAT_WR_BYTE(EP_STAT_ST));
} else {
/* End stall */
ep->wedge = 0;
udc_protocol_cmd_data_w(udc, CMD_SET_EP_STAT(ep->hwep_num),
DAT_WR_BYTE(0));
}
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
/* set the halt feature and ignores clear requests */
static int lpc32xx_ep_set_wedge(struct usb_ep *_ep)
{
struct lpc32xx_ep *ep = container_of(_ep, struct lpc32xx_ep, ep);
if (!_ep || !ep->udc)
return -EINVAL;
ep->wedge = 1;
return usb_ep_set_halt(_ep);
}
static const struct usb_ep_ops lpc32xx_ep_ops = {
.enable = lpc32xx_ep_enable,
.disable = lpc32xx_ep_disable,
.alloc_request = lpc32xx_ep_alloc_request,
.free_request = lpc32xx_ep_free_request,
.queue = lpc32xx_ep_queue,
.dequeue = lpc32xx_ep_dequeue,
.set_halt = lpc32xx_ep_set_halt,
.set_wedge = lpc32xx_ep_set_wedge,
};
/* Send a ZLP on a non-0 IN EP */
void udc_send_in_zlp(struct lpc32xx_udc *udc, struct lpc32xx_ep *ep)
{
/* Clear EP status */
udc_clearep_getsts(udc, ep->hwep_num);
/* Send ZLP via FIFO mechanism */
udc_write_hwep(udc, ep->hwep_num, NULL, 0);
}
/*
* Handle EP completion for ZLP
* This function will only be called when a delayed ZLP needs to be sent out
* after a DMA transfer has filled both buffers.
*/
void udc_handle_eps(struct lpc32xx_udc *udc, struct lpc32xx_ep *ep)
{
u32 epstatus;
struct lpc32xx_request *req;
if (ep->hwep_num <= 0)
return;
uda_clear_hwepint(udc, ep->hwep_num);
/* If this interrupt isn't enabled, return now */
if (!(udc->enabled_hwepints & (1 << ep->hwep_num)))
return;
/* Get endpoint status */
epstatus = udc_clearep_getsts(udc, ep->hwep_num);
/*
* This should never happen, but protect against writing to the
* buffer when full.
*/
if (epstatus & EP_SEL_F)
return;
if (ep->is_in) {
udc_send_in_zlp(udc, ep);
uda_disable_hwepint(udc, ep->hwep_num);
} else
return;
/* If there isn't a request waiting, something went wrong */
req = list_entry(ep->queue.next, struct lpc32xx_request, queue);
if (req) {
done(ep, req, 0);
/* Start another request if ready */
if (!list_empty(&ep->queue)) {
if (ep->is_in)
udc_ep_in_req_dma(udc, ep);
else
udc_ep_out_req_dma(udc, ep);
} else
ep->req_pending = 0;
}
}
/* DMA end of transfer completion */
static void udc_handle_dma_ep(struct lpc32xx_udc *udc, struct lpc32xx_ep *ep)
{
u32 status, epstatus;
struct lpc32xx_request *req;
struct lpc32xx_usbd_dd_gad *dd;
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
ep->totalints++;
#endif
req = list_entry(ep->queue.next, struct lpc32xx_request, queue);
if (!req) {
ep_err(ep, "DMA interrupt on no req!\n");
return;
}
dd = req->dd_desc_ptr;
/* DMA descriptor should always be retired for this call */
if (!(dd->dd_status & DD_STATUS_DD_RETIRED))
ep_warn(ep, "DMA descriptor did not retire\n");
/* Disable DMA */
udc_ep_dma_disable(udc, ep->hwep_num);
writel((1 << ep->hwep_num), USBD_EOTINTCLR(udc->udp_baseaddr));
writel((1 << ep->hwep_num), USBD_NDDRTINTCLR(udc->udp_baseaddr));
/* System error? */
if (readl(USBD_SYSERRTINTST(udc->udp_baseaddr)) &
(1 << ep->hwep_num)) {
writel((1 << ep->hwep_num),
USBD_SYSERRTINTCLR(udc->udp_baseaddr));
ep_err(ep, "AHB critical error!\n");
ep->req_pending = 0;
/* The error could have occurred on a packet of a multipacket
* transfer, so recovering the transfer is not possible. Close
* the request with an error */
done(ep, req, -ECONNABORTED);
return;
}
/* Handle the current DD's status */
status = dd->dd_status;
switch (status & DD_STATUS_STS_MASK) {
case DD_STATUS_STS_NS:
/* DD not serviced? This shouldn't happen! */
ep->req_pending = 0;
ep_err(ep, "DMA critical EP error: DD not serviced (0x%x)!\n",
status);
done(ep, req, -ECONNABORTED);
return;
case DD_STATUS_STS_BS:
/* Interrupt only fires on EOT - This shouldn't happen! */
ep->req_pending = 0;
ep_err(ep, "DMA critical EP error: EOT prior to service completion (0x%x)!\n",
status);
done(ep, req, -ECONNABORTED);
return;
case DD_STATUS_STS_NC:
case DD_STATUS_STS_DUR:
/* Really just a short packet, not an underrun */
/* This is a good status and what we expect */
break;
default:
/* Data overrun, system error, or unknown */
ep->req_pending = 0;
ep_err(ep, "DMA critical EP error: System error (0x%x)!\n",
status);
done(ep, req, -ECONNABORTED);
return;
}
/* ISO endpoints are handled differently */
if (ep->eptype == EP_ISO_TYPE) {
if (ep->is_in)
req->req.actual = req->req.length;
else
req->req.actual = dd->iso_status[0] & 0xFFFF;
} else
req->req.actual += DD_STATUS_CURDMACNT(status);
/* Send a ZLP if necessary. This will be done for non-int
* packets which have a size that is a divisor of MAXP */
if (req->send_zlp) {
/*
* If at least 1 buffer is available, send the ZLP now.
* Otherwise, the ZLP send needs to be deferred until a
* buffer is available.
*/
if (udc_clearep_getsts(udc, ep->hwep_num) & EP_SEL_F) {
udc_clearep_getsts(udc, ep->hwep_num);
uda_enable_hwepint(udc, ep->hwep_num);
epstatus = udc_clearep_getsts(udc, ep->hwep_num);
/* Let the EP interrupt handle the ZLP */
return;
} else
udc_send_in_zlp(udc, ep);
}
/* Transfer request is complete */
done(ep, req, 0);
/* Start another request if ready */
udc_clearep_getsts(udc, ep->hwep_num);
if (!list_empty((&ep->queue))) {
if (ep->is_in)
udc_ep_in_req_dma(udc, ep);
else
udc_ep_out_req_dma(udc, ep);
} else
ep->req_pending = 0;
}
/*
*
* Endpoint 0 functions
*
*/
static void udc_handle_dev(struct lpc32xx_udc *udc)
{
u32 tmp;
udc_protocol_cmd_w(udc, CMD_GET_DEV_STAT);
tmp = udc_protocol_cmd_r(udc, DAT_GET_DEV_STAT);
if (tmp & DEV_RST)
uda_usb_reset(udc);
else if (tmp & DEV_CON_CH)
uda_power_event(udc, (tmp & DEV_CON));
else if (tmp & DEV_SUS_CH) {
if (tmp & DEV_SUS) {
if (udc->vbus == 0)
stop_activity(udc);
else if ((udc->gadget.speed != USB_SPEED_UNKNOWN) &&
udc->driver) {
/* Power down transceiver */
udc->poweron = 0;
schedule_work(&udc->pullup_job);
uda_resm_susp_event(udc, 1);
}
} else if ((udc->gadget.speed != USB_SPEED_UNKNOWN) &&
udc->driver && udc->vbus) {
uda_resm_susp_event(udc, 0);
/* Power up transceiver */
udc->poweron = 1;
schedule_work(&udc->pullup_job);
}
}
}
static int udc_get_status(struct lpc32xx_udc *udc, u16 reqtype, u16 wIndex)
{
struct lpc32xx_ep *ep;
u32 ep0buff = 0, tmp;
switch (reqtype & USB_RECIP_MASK) {
case USB_RECIP_INTERFACE:
break; /* Not supported */
case USB_RECIP_DEVICE:
ep0buff = (udc->selfpowered << USB_DEVICE_SELF_POWERED);
if (udc->dev_status & (1 << USB_DEVICE_REMOTE_WAKEUP))
ep0buff |= (1 << USB_DEVICE_REMOTE_WAKEUP);
break;
case USB_RECIP_ENDPOINT:
tmp = wIndex & USB_ENDPOINT_NUMBER_MASK;
ep = &udc->ep[tmp];
if ((tmp == 0) || (tmp >= NUM_ENDPOINTS))
return -EOPNOTSUPP;
if (wIndex & USB_DIR_IN) {
if (!ep->is_in)
return -EOPNOTSUPP; /* Something's wrong */
} else if (ep->is_in)
return -EOPNOTSUPP; /* Not an IN endpoint */
/* Get status of the endpoint */
udc_protocol_cmd_w(udc, CMD_SEL_EP(ep->hwep_num));
tmp = udc_protocol_cmd_r(udc, DAT_SEL_EP(ep->hwep_num));
if (tmp & EP_SEL_ST)
ep0buff = (1 << USB_ENDPOINT_HALT);
else
ep0buff = 0;
break;
default:
break;
}
/* Return data */
udc_write_hwep(udc, EP_IN, &ep0buff, 2);
return 0;
}
static void udc_handle_ep0_setup(struct lpc32xx_udc *udc)
{
struct lpc32xx_ep *ep, *ep0 = &udc->ep[0];
struct usb_ctrlrequest ctrlpkt;
int i, bytes;
u16 wIndex, wValue, wLength, reqtype, req, tmp;
/* Nuke previous transfers */
nuke(ep0, -EPROTO);
/* Get setup packet */
bytes = udc_read_hwep(udc, EP_OUT, (u32 *) &ctrlpkt, 8);
if (bytes != 8) {
ep_warn(ep0, "Incorrectly sized setup packet (s/b 8, is %d)!\n",
bytes);
return;
}
/* Native endianness */
wIndex = le16_to_cpu(ctrlpkt.wIndex);
wValue = le16_to_cpu(ctrlpkt.wValue);
wLength = le16_to_cpu(ctrlpkt.wLength);
reqtype = le16_to_cpu(ctrlpkt.bRequestType);
/* Set direction of EP0 */
if (likely(reqtype & USB_DIR_IN))
ep0->is_in = 1;
else
ep0->is_in = 0;
/* Handle SETUP packet */
req = le16_to_cpu(ctrlpkt.bRequest);
switch (req) {
case USB_REQ_CLEAR_FEATURE:
case USB_REQ_SET_FEATURE:
switch (reqtype) {
case (USB_TYPE_STANDARD | USB_RECIP_DEVICE):
if (wValue != USB_DEVICE_REMOTE_WAKEUP)
goto stall; /* Nothing else handled */
/* Tell board about event */
if (req == USB_REQ_CLEAR_FEATURE)
udc->dev_status &=
~(1 << USB_DEVICE_REMOTE_WAKEUP);
else
udc->dev_status |=
(1 << USB_DEVICE_REMOTE_WAKEUP);
uda_remwkp_cgh(udc);
goto zlp_send;
case (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
tmp = wIndex & USB_ENDPOINT_NUMBER_MASK;
if ((wValue != USB_ENDPOINT_HALT) ||
(tmp >= NUM_ENDPOINTS))
break;
/* Find hardware endpoint from logical endpoint */
ep = &udc->ep[tmp];
tmp = ep->hwep_num;
if (tmp == 0)
break;
if (req == USB_REQ_SET_FEATURE)
udc_stall_hwep(udc, tmp);
else if (!ep->wedge)
udc_clrstall_hwep(udc, tmp);
goto zlp_send;
default:
break;
}
case USB_REQ_SET_ADDRESS:
if (reqtype == (USB_TYPE_STANDARD | USB_RECIP_DEVICE)) {
udc_set_address(udc, wValue);
goto zlp_send;
}
break;
case USB_REQ_GET_STATUS:
udc_get_status(udc, reqtype, wIndex);
return;
default:
break; /* Let GadgetFS handle the descriptor instead */
}
if (likely(udc->driver)) {
/* device-2-host (IN) or no data setup command, process
* immediately */
spin_unlock(&udc->lock);
i = udc->driver->setup(&udc->gadget, &ctrlpkt);
spin_lock(&udc->lock);
if (req == USB_REQ_SET_CONFIGURATION) {
/* Configuration is set after endpoints are realized */
if (wValue) {
/* Set configuration */
udc_set_device_configured(udc);
udc_protocol_cmd_data_w(udc, CMD_SET_MODE,
DAT_WR_BYTE(AP_CLK |
INAK_BI | INAK_II));
} else {
/* Clear configuration */
udc_set_device_unconfigured(udc);
/* Disable NAK interrupts */
udc_protocol_cmd_data_w(udc, CMD_SET_MODE,
DAT_WR_BYTE(AP_CLK));
}
}
if (i < 0) {
/* setup processing failed, force stall */
dev_dbg(udc->dev,
"req %02x.%02x protocol STALL; stat %d\n",
reqtype, req, i);
udc->ep0state = WAIT_FOR_SETUP;
goto stall;
}
}
if (!ep0->is_in)
udc_ep0_send_zlp(udc); /* ZLP IN packet on data phase */
return;
stall:
udc_stall_hwep(udc, EP_IN);
return;
zlp_send:
udc_ep0_send_zlp(udc);
return;
}
/* IN endpoint 0 transfer */
static void udc_handle_ep0_in(struct lpc32xx_udc *udc)
{
struct lpc32xx_ep *ep0 = &udc->ep[0];
u32 epstatus;
/* Clear EP interrupt */
epstatus = udc_clearep_getsts(udc, EP_IN);
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
ep0->totalints++;
#endif
/* Stalled? Clear stall and reset buffers */
if (epstatus & EP_SEL_ST) {
udc_clrstall_hwep(udc, EP_IN);
nuke(ep0, -ECONNABORTED);
udc->ep0state = WAIT_FOR_SETUP;
return;
}
/* Is a buffer available? */
if (!(epstatus & EP_SEL_F)) {
/* Handle based on current state */
if (udc->ep0state == DATA_IN)
udc_ep0_in_req(udc);
else {
/* Unknown state for EP0 oe end of DATA IN phase */
nuke(ep0, -ECONNABORTED);
udc->ep0state = WAIT_FOR_SETUP;
}
}
}
/* OUT endpoint 0 transfer */
static void udc_handle_ep0_out(struct lpc32xx_udc *udc)
{
struct lpc32xx_ep *ep0 = &udc->ep[0];
u32 epstatus;
/* Clear EP interrupt */
epstatus = udc_clearep_getsts(udc, EP_OUT);
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
ep0->totalints++;
#endif
/* Stalled? */
if (epstatus & EP_SEL_ST) {
udc_clrstall_hwep(udc, EP_OUT);
nuke(ep0, -ECONNABORTED);
udc->ep0state = WAIT_FOR_SETUP;
return;
}
/* A NAK may occur if a packet couldn't be received yet */
if (epstatus & EP_SEL_EPN)
return;
/* Setup packet incoming? */
if (epstatus & EP_SEL_STP) {
nuke(ep0, 0);
udc->ep0state = WAIT_FOR_SETUP;
}
/* Data available? */
if (epstatus & EP_SEL_F)
/* Handle based on current state */
switch (udc->ep0state) {
case WAIT_FOR_SETUP:
udc_handle_ep0_setup(udc);
break;
case DATA_OUT:
udc_ep0_out_req(udc);
break;
default:
/* Unknown state for EP0 */
nuke(ep0, -ECONNABORTED);
udc->ep0state = WAIT_FOR_SETUP;
}
}
/* Must be called without lock */
static int lpc32xx_get_frame(struct usb_gadget *gadget)
{
int frame;
unsigned long flags;
struct lpc32xx_udc *udc = to_udc(gadget);
if (!udc->clocked)
return -EINVAL;
spin_lock_irqsave(&udc->lock, flags);
frame = (int) udc_get_current_frame(udc);
spin_unlock_irqrestore(&udc->lock, flags);
return frame;
}
static int lpc32xx_wakeup(struct usb_gadget *gadget)
{
return -ENOTSUPP;
}
static int lpc32xx_set_selfpowered(struct usb_gadget *gadget, int is_on)
{
struct lpc32xx_udc *udc = to_udc(gadget);
/* Always self-powered */
udc->selfpowered = (is_on != 0);
return 0;
}
/*
* vbus is here! turn everything on that's ready
* Must be called without lock
*/
static int lpc32xx_vbus_session(struct usb_gadget *gadget, int is_active)
{
unsigned long flags;
struct lpc32xx_udc *udc = to_udc(gadget);
spin_lock_irqsave(&udc->lock, flags);
/* Doesn't need lock */
if (udc->driver) {
udc_clk_set(udc, 1);
udc_enable(udc);
pullup(udc, is_active);
} else {
stop_activity(udc);
pullup(udc, 0);
spin_unlock_irqrestore(&udc->lock, flags);
/*
* Wait for all the endpoints to disable,
* before disabling clocks. Don't wait if
* endpoints are not enabled.
*/
if (atomic_read(&udc->enabled_ep_cnt))
wait_event_interruptible(udc->ep_disable_wait_queue,
(atomic_read(&udc->enabled_ep_cnt) == 0));
spin_lock_irqsave(&udc->lock, flags);
udc_clk_set(udc, 0);
}
spin_unlock_irqrestore(&udc->lock, flags);
return 0;
}
/* Can be called with or without lock */
static int lpc32xx_pullup(struct usb_gadget *gadget, int is_on)
{
struct lpc32xx_udc *udc = to_udc(gadget);
/* Doesn't need lock */
pullup(udc, is_on);
return 0;
}
static int lpc32xx_start(struct usb_gadget *, struct usb_gadget_driver *);
static int lpc32xx_stop(struct usb_gadget *, struct usb_gadget_driver *);
static const struct usb_gadget_ops lpc32xx_udc_ops = {
.get_frame = lpc32xx_get_frame,
.wakeup = lpc32xx_wakeup,
.set_selfpowered = lpc32xx_set_selfpowered,
.vbus_session = lpc32xx_vbus_session,
.pullup = lpc32xx_pullup,
.udc_start = lpc32xx_start,
.udc_stop = lpc32xx_stop,
};
static void nop_release(struct device *dev)
{
/* nothing to free */
}
static const struct lpc32xx_udc controller_template = {
.gadget = {
.ops = &lpc32xx_udc_ops,
.name = driver_name,
.dev = {
.init_name = "gadget",
.release = nop_release,
}
},
.ep[0] = {
.ep = {
.name = "ep0",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 64,
.hwep_num_base = 0,
.hwep_num = 0, /* Can be 0 or 1, has special handling */
.lep = 0,
.eptype = EP_CTL_TYPE,
},
.ep[1] = {
.ep = {
.name = "ep1-int",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 64,
.hwep_num_base = 2,
.hwep_num = 0, /* 2 or 3, will be set later */
.lep = 1,
.eptype = EP_INT_TYPE,
},
.ep[2] = {
.ep = {
.name = "ep2-bulk",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 64,
.hwep_num_base = 4,
.hwep_num = 0, /* 4 or 5, will be set later */
.lep = 2,
.eptype = EP_BLK_TYPE,
},
.ep[3] = {
.ep = {
.name = "ep3-iso",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 1023,
.hwep_num_base = 6,
.hwep_num = 0, /* 6 or 7, will be set later */
.lep = 3,
.eptype = EP_ISO_TYPE,
},
.ep[4] = {
.ep = {
.name = "ep4-int",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 64,
.hwep_num_base = 8,
.hwep_num = 0, /* 8 or 9, will be set later */
.lep = 4,
.eptype = EP_INT_TYPE,
},
.ep[5] = {
.ep = {
.name = "ep5-bulk",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 64,
.hwep_num_base = 10,
.hwep_num = 0, /* 10 or 11, will be set later */
.lep = 5,
.eptype = EP_BLK_TYPE,
},
.ep[6] = {
.ep = {
.name = "ep6-iso",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 1023,
.hwep_num_base = 12,
.hwep_num = 0, /* 12 or 13, will be set later */
.lep = 6,
.eptype = EP_ISO_TYPE,
},
.ep[7] = {
.ep = {
.name = "ep7-int",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 64,
.hwep_num_base = 14,
.hwep_num = 0,
.lep = 7,
.eptype = EP_INT_TYPE,
},
.ep[8] = {
.ep = {
.name = "ep8-bulk",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 64,
.hwep_num_base = 16,
.hwep_num = 0,
.lep = 8,
.eptype = EP_BLK_TYPE,
},
.ep[9] = {
.ep = {
.name = "ep9-iso",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 1023,
.hwep_num_base = 18,
.hwep_num = 0,
.lep = 9,
.eptype = EP_ISO_TYPE,
},
.ep[10] = {
.ep = {
.name = "ep10-int",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 64,
.hwep_num_base = 20,
.hwep_num = 0,
.lep = 10,
.eptype = EP_INT_TYPE,
},
.ep[11] = {
.ep = {
.name = "ep11-bulk",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 64,
.hwep_num_base = 22,
.hwep_num = 0,
.lep = 11,
.eptype = EP_BLK_TYPE,
},
.ep[12] = {
.ep = {
.name = "ep12-iso",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 1023,
.hwep_num_base = 24,
.hwep_num = 0,
.lep = 12,
.eptype = EP_ISO_TYPE,
},
.ep[13] = {
.ep = {
.name = "ep13-int",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 64,
.hwep_num_base = 26,
.hwep_num = 0,
.lep = 13,
.eptype = EP_INT_TYPE,
},
.ep[14] = {
.ep = {
.name = "ep14-bulk",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 64,
.hwep_num_base = 28,
.hwep_num = 0,
.lep = 14,
.eptype = EP_BLK_TYPE,
},
.ep[15] = {
.ep = {
.name = "ep15-bulk",
.ops = &lpc32xx_ep_ops,
},
.maxpacket = 1023,
.hwep_num_base = 30,
.hwep_num = 0,
.lep = 15,
.eptype = EP_BLK_TYPE,
},
};
/* ISO and status interrupts */
static irqreturn_t lpc32xx_usb_lp_irq(int irq, void *_udc)
{
u32 tmp, devstat;
struct lpc32xx_udc *udc = _udc;
spin_lock(&udc->lock);
/* Read the device status register */
devstat = readl(USBD_DEVINTST(udc->udp_baseaddr));
devstat &= ~USBD_EP_FAST;
writel(devstat, USBD_DEVINTCLR(udc->udp_baseaddr));
devstat = devstat & udc->enabled_devints;
/* Device specific handling needed? */
if (devstat & USBD_DEV_STAT)
udc_handle_dev(udc);
/* Start of frame? (devstat & FRAME_INT):
* The frame interrupt isn't really needed for ISO support,
* as the driver will queue the necessary packets */
/* Error? */
if (devstat & ERR_INT) {
/* All types of errors, from cable removal during transfer to
* misc protocol and bit errors. These are mostly for just info,
* as the USB hardware will work around these. If these errors
* happen alot, something is wrong. */
udc_protocol_cmd_w(udc, CMD_RD_ERR_STAT);
tmp = udc_protocol_cmd_r(udc, DAT_RD_ERR_STAT);
dev_dbg(udc->dev, "Device error (0x%x)!\n", tmp);
}
spin_unlock(&udc->lock);
return IRQ_HANDLED;
}
/* EP interrupts */
static irqreturn_t lpc32xx_usb_hp_irq(int irq, void *_udc)
{
u32 tmp;
struct lpc32xx_udc *udc = _udc;
spin_lock(&udc->lock);
/* Read the device status register */
writel(USBD_EP_FAST, USBD_DEVINTCLR(udc->udp_baseaddr));
/* Endpoints */
tmp = readl(USBD_EPINTST(udc->udp_baseaddr));
/* Special handling for EP0 */
if (tmp & (EP_MASK_SEL(0, EP_OUT) | EP_MASK_SEL(0, EP_IN))) {
/* Handle EP0 IN */
if (tmp & (EP_MASK_SEL(0, EP_IN)))
udc_handle_ep0_in(udc);
/* Handle EP0 OUT */
if (tmp & (EP_MASK_SEL(0, EP_OUT)))
udc_handle_ep0_out(udc);
}
/* All other EPs */
if (tmp & ~(EP_MASK_SEL(0, EP_OUT) | EP_MASK_SEL(0, EP_IN))) {
int i;
/* Handle other EP interrupts */
for (i = 1; i < NUM_ENDPOINTS; i++) {
if (tmp & (1 << udc->ep[i].hwep_num))
udc_handle_eps(udc, &udc->ep[i]);
}
}
spin_unlock(&udc->lock);
return IRQ_HANDLED;
}
static irqreturn_t lpc32xx_usb_devdma_irq(int irq, void *_udc)
{
struct lpc32xx_udc *udc = _udc;
int i;
u32 tmp;
spin_lock(&udc->lock);
/* Handle EP DMA EOT interrupts */
tmp = readl(USBD_EOTINTST(udc->udp_baseaddr)) |
(readl(USBD_EPDMAST(udc->udp_baseaddr)) &
readl(USBD_NDDRTINTST(udc->udp_baseaddr))) |
readl(USBD_SYSERRTINTST(udc->udp_baseaddr));
for (i = 1; i < NUM_ENDPOINTS; i++) {
if (tmp & (1 << udc->ep[i].hwep_num))
udc_handle_dma_ep(udc, &udc->ep[i]);
}
spin_unlock(&udc->lock);
return IRQ_HANDLED;
}
/*
*
* VBUS detection, pullup handler, and Gadget cable state notification
*
*/
static void vbus_work(struct work_struct *work)
{
u8 value;
struct lpc32xx_udc *udc = container_of(work, struct lpc32xx_udc,
vbus_job);
if (udc->enabled != 0) {
/* Discharge VBUS real quick */
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DISCHRG);
/* Give VBUS some time (100mS) to discharge */
msleep(100);
/* Disable VBUS discharge resistor */
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR,
OTG1_VBUS_DISCHRG);
/* Clear interrupt */
i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_INTERRUPT_LATCH |
ISP1301_I2C_REG_CLEAR_ADDR, ~0);
/* Get the VBUS status from the transceiver */
value = i2c_smbus_read_byte_data(udc->isp1301_i2c_client,
ISP1301_I2C_INTERRUPT_SOURCE);
/* VBUS on or off? */
if (value & INT_SESS_VLD)
udc->vbus = 1;
else
udc->vbus = 0;
/* VBUS changed? */
if (udc->last_vbus != udc->vbus) {
udc->last_vbus = udc->vbus;
lpc32xx_vbus_session(&udc->gadget, udc->vbus);
}
}
/* Re-enable after completion */
enable_irq(udc->udp_irq[IRQ_USB_ATX]);
}
static irqreturn_t lpc32xx_usb_vbus_irq(int irq, void *_udc)
{
struct lpc32xx_udc *udc = _udc;
/* Defer handling of VBUS IRQ to work queue */
disable_irq_nosync(udc->udp_irq[IRQ_USB_ATX]);
schedule_work(&udc->vbus_job);
return IRQ_HANDLED;
}
static int lpc32xx_start(struct usb_gadget *gadget,
struct usb_gadget_driver *driver)
{
struct lpc32xx_udc *udc = to_udc(gadget);
int i;
if (!driver || driver->max_speed < USB_SPEED_FULL || !driver->setup) {
dev_err(udc->dev, "bad parameter.\n");
return -EINVAL;
}
if (udc->driver) {
dev_err(udc->dev, "UDC already has a gadget driver\n");
return -EBUSY;
}
udc->driver = driver;
udc->gadget.dev.of_node = udc->dev->of_node;
udc->enabled = 1;
udc->selfpowered = 1;
udc->vbus = 0;
/* Force VBUS process once to check for cable insertion */
udc->last_vbus = udc->vbus = 0;
schedule_work(&udc->vbus_job);
/* Do not re-enable ATX IRQ (3) */
for (i = IRQ_USB_LP; i < IRQ_USB_ATX; i++)
enable_irq(udc->udp_irq[i]);
return 0;
}
static int lpc32xx_stop(struct usb_gadget *gadget,
struct usb_gadget_driver *driver)
{
int i;
struct lpc32xx_udc *udc = to_udc(gadget);
if (!driver || driver != udc->driver)
return -EINVAL;
for (i = IRQ_USB_LP; i <= IRQ_USB_ATX; i++)
disable_irq(udc->udp_irq[i]);
if (udc->clocked) {
spin_lock(&udc->lock);
stop_activity(udc);
spin_unlock(&udc->lock);
/*
* Wait for all the endpoints to disable,
* before disabling clocks. Don't wait if
* endpoints are not enabled.
*/
if (atomic_read(&udc->enabled_ep_cnt))
wait_event_interruptible(udc->ep_disable_wait_queue,
(atomic_read(&udc->enabled_ep_cnt) == 0));
spin_lock(&udc->lock);
udc_clk_set(udc, 0);
spin_unlock(&udc->lock);
}
udc->enabled = 0;
udc->driver = NULL;
return 0;
}
static void lpc32xx_udc_shutdown(struct platform_device *dev)
{
/* Force disconnect on reboot */
struct lpc32xx_udc *udc = platform_get_drvdata(dev);
pullup(udc, 0);
}
/*
* Callbacks to be overridden by options passed via OF (TODO)
*/
static void lpc32xx_usbd_conn_chg(int conn)
{
/* Do nothing, it might be nice to enable an LED
* based on conn state being !0 */
}
static void lpc32xx_usbd_susp_chg(int susp)
{
/* Device suspend if susp != 0 */
}
static void lpc32xx_rmwkup_chg(int remote_wakup_enable)
{
/* Enable or disable USB remote wakeup */
}
struct lpc32xx_usbd_cfg lpc32xx_usbddata = {
.vbus_drv_pol = 0,
.conn_chgb = &lpc32xx_usbd_conn_chg,
.susp_chgb = &lpc32xx_usbd_susp_chg,
.rmwk_chgb = &lpc32xx_rmwkup_chg,
};
static u64 lpc32xx_usbd_dmamask = ~(u32) 0x7F;
static int __init lpc32xx_udc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct lpc32xx_udc *udc;
int retval, i;
struct resource *res;
dma_addr_t dma_handle;
struct device_node *isp1301_node;
udc = kzalloc(sizeof(*udc), GFP_KERNEL);
if (!udc)
return -ENOMEM;
memcpy(udc, &controller_template, sizeof(*udc));
for (i = 0; i <= 15; i++)
udc->ep[i].udc = udc;
udc->gadget.ep0 = &udc->ep[0].ep;
/* init software state */
udc->gadget.dev.parent = dev;
udc->pdev = pdev;
udc->dev = &pdev->dev;
udc->enabled = 0;
if (pdev->dev.of_node) {
isp1301_node = of_parse_phandle(pdev->dev.of_node,
"transceiver", 0);
} else {
isp1301_node = NULL;
}
udc->isp1301_i2c_client = isp1301_get_client(isp1301_node);
if (!udc->isp1301_i2c_client) {
retval = -EPROBE_DEFER;
goto phy_fail;
}
dev_info(udc->dev, "ISP1301 I2C device at address 0x%x\n",
udc->isp1301_i2c_client->addr);
pdev->dev.dma_mask = &lpc32xx_usbd_dmamask;
retval = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
if (retval)
goto resource_fail;
udc->board = &lpc32xx_usbddata;
/*
* Resources are mapped as follows:
* IORESOURCE_MEM, base address and size of USB space
* IORESOURCE_IRQ, USB device low priority interrupt number
* IORESOURCE_IRQ, USB device high priority interrupt number
* IORESOURCE_IRQ, USB device interrupt number
* IORESOURCE_IRQ, USB transceiver interrupt number
*/
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
retval = -ENXIO;
goto resource_fail;
}
spin_lock_init(&udc->lock);
/* Get IRQs */
for (i = 0; i < 4; i++) {
udc->udp_irq[i] = platform_get_irq(pdev, i);
if (udc->udp_irq[i] < 0) {
dev_err(udc->dev,
"irq resource %d not available!\n", i);
retval = udc->udp_irq[i];
goto irq_fail;
}
}
udc->io_p_start = res->start;
udc->io_p_size = resource_size(res);
if (!request_mem_region(udc->io_p_start, udc->io_p_size, driver_name)) {
dev_err(udc->dev, "someone's using UDC memory\n");
retval = -EBUSY;
goto request_mem_region_fail;
}
udc->udp_baseaddr = ioremap(udc->io_p_start, udc->io_p_size);
if (!udc->udp_baseaddr) {
retval = -ENOMEM;
dev_err(udc->dev, "IO map failure\n");
goto io_map_fail;
}
/* Enable AHB slave USB clock, needed for further USB clock control */
writel(USB_SLAVE_HCLK_EN | (1 << 19), USB_CTRL);
/* Get required clocks */
udc->usb_pll_clk = clk_get(&pdev->dev, "ck_pll5");
if (IS_ERR(udc->usb_pll_clk)) {
dev_err(udc->dev, "failed to acquire USB PLL\n");
retval = PTR_ERR(udc->usb_pll_clk);
goto pll_get_fail;
}
udc->usb_slv_clk = clk_get(&pdev->dev, "ck_usbd");
if (IS_ERR(udc->usb_slv_clk)) {
dev_err(udc->dev, "failed to acquire USB device clock\n");
retval = PTR_ERR(udc->usb_slv_clk);
goto usb_clk_get_fail;
}
udc->usb_otg_clk = clk_get(&pdev->dev, "ck_usb_otg");
if (IS_ERR(udc->usb_otg_clk)) {
dev_err(udc->dev, "failed to acquire USB otg clock\n");
retval = PTR_ERR(udc->usb_otg_clk);
goto usb_otg_clk_get_fail;
}
/* Setup PLL clock to 48MHz */
retval = clk_enable(udc->usb_pll_clk);
if (retval < 0) {
dev_err(udc->dev, "failed to start USB PLL\n");
goto pll_enable_fail;
}
retval = clk_set_rate(udc->usb_pll_clk, 48000);
if (retval < 0) {
dev_err(udc->dev, "failed to set USB clock rate\n");
goto pll_set_fail;
}
writel(readl(USB_CTRL) | USB_DEV_NEED_CLK_EN, USB_CTRL);
/* Enable USB device clock */
retval = clk_enable(udc->usb_slv_clk);
if (retval < 0) {
dev_err(udc->dev, "failed to start USB device clock\n");
goto usb_clk_enable_fail;
}
/* Enable USB OTG clock */
retval = clk_enable(udc->usb_otg_clk);
if (retval < 0) {
dev_err(udc->dev, "failed to start USB otg clock\n");
goto usb_otg_clk_enable_fail;
}
/* Setup deferred workqueue data */
udc->poweron = udc->pullup = 0;
INIT_WORK(&udc->pullup_job, pullup_work);
INIT_WORK(&udc->vbus_job, vbus_work);
#ifdef CONFIG_PM
INIT_WORK(&udc->power_job, power_work);
#endif
/* All clocks are now on */
udc->clocked = 1;
isp1301_udc_configure(udc);
/* Allocate memory for the UDCA */
udc->udca_v_base = dma_alloc_coherent(&pdev->dev, UDCA_BUFF_SIZE,
&dma_handle,
(GFP_KERNEL | GFP_DMA));
if (!udc->udca_v_base) {
dev_err(udc->dev, "error getting UDCA region\n");
retval = -ENOMEM;
goto i2c_fail;
}
udc->udca_p_base = dma_handle;
dev_dbg(udc->dev, "DMA buffer(0x%x bytes), P:0x%08x, V:0x%p\n",
UDCA_BUFF_SIZE, udc->udca_p_base, udc->udca_v_base);
/* Setup the DD DMA memory pool */
udc->dd_cache = dma_pool_create("udc_dd", udc->dev,
sizeof(struct lpc32xx_usbd_dd_gad),
sizeof(u32), 0);
if (!udc->dd_cache) {
dev_err(udc->dev, "error getting DD DMA region\n");
retval = -ENOMEM;
goto dma_alloc_fail;
}
/* Clear USB peripheral and initialize gadget endpoints */
udc_disable(udc);
udc_reinit(udc);
/* Request IRQs - low and high priority USB device IRQs are routed to
* the same handler, while the DMA interrupt is routed elsewhere */
retval = request_irq(udc->udp_irq[IRQ_USB_LP], lpc32xx_usb_lp_irq,
0, "udc_lp", udc);
if (retval < 0) {
dev_err(udc->dev, "LP request irq %d failed\n",
udc->udp_irq[IRQ_USB_LP]);
goto irq_lp_fail;
}
retval = request_irq(udc->udp_irq[IRQ_USB_HP], lpc32xx_usb_hp_irq,
0, "udc_hp", udc);
if (retval < 0) {
dev_err(udc->dev, "HP request irq %d failed\n",
udc->udp_irq[IRQ_USB_HP]);
goto irq_hp_fail;
}
retval = request_irq(udc->udp_irq[IRQ_USB_DEVDMA],
lpc32xx_usb_devdma_irq, 0, "udc_dma", udc);
if (retval < 0) {
dev_err(udc->dev, "DEV request irq %d failed\n",
udc->udp_irq[IRQ_USB_DEVDMA]);
goto irq_dev_fail;
}
/* The transceiver interrupt is used for VBUS detection and will
kick off the VBUS handler function */
retval = request_irq(udc->udp_irq[IRQ_USB_ATX], lpc32xx_usb_vbus_irq,
0, "udc_otg", udc);
if (retval < 0) {
dev_err(udc->dev, "VBUS request irq %d failed\n",
udc->udp_irq[IRQ_USB_ATX]);
goto irq_xcvr_fail;
}
/* Initialize wait queue */
init_waitqueue_head(&udc->ep_disable_wait_queue);
atomic_set(&udc->enabled_ep_cnt, 0);
/* Keep all IRQs disabled until GadgetFS starts up */
for (i = IRQ_USB_LP; i <= IRQ_USB_ATX; i++)
disable_irq(udc->udp_irq[i]);
retval = usb_add_gadget_udc(dev, &udc->gadget);
if (retval < 0)
goto add_gadget_fail;
dev_set_drvdata(dev, udc);
device_init_wakeup(dev, 1);
create_debug_file(udc);
/* Disable clocks for now */
udc_clk_set(udc, 0);
dev_info(udc->dev, "%s version %s\n", driver_name, DRIVER_VERSION);
return 0;
add_gadget_fail:
free_irq(udc->udp_irq[IRQ_USB_ATX], udc);
irq_xcvr_fail:
free_irq(udc->udp_irq[IRQ_USB_DEVDMA], udc);
irq_dev_fail:
free_irq(udc->udp_irq[IRQ_USB_HP], udc);
irq_hp_fail:
free_irq(udc->udp_irq[IRQ_USB_LP], udc);
irq_lp_fail:
dma_pool_destroy(udc->dd_cache);
dma_alloc_fail:
dma_free_coherent(&pdev->dev, UDCA_BUFF_SIZE,
udc->udca_v_base, udc->udca_p_base);
i2c_fail:
clk_disable(udc->usb_otg_clk);
usb_otg_clk_enable_fail:
clk_disable(udc->usb_slv_clk);
usb_clk_enable_fail:
pll_set_fail:
clk_disable(udc->usb_pll_clk);
pll_enable_fail:
clk_put(udc->usb_otg_clk);
usb_otg_clk_get_fail:
clk_put(udc->usb_slv_clk);
usb_clk_get_fail:
clk_put(udc->usb_pll_clk);
pll_get_fail:
iounmap(udc->udp_baseaddr);
io_map_fail:
release_mem_region(udc->io_p_start, udc->io_p_size);
dev_err(udc->dev, "%s probe failed, %d\n", driver_name, retval);
request_mem_region_fail:
irq_fail:
resource_fail:
phy_fail:
kfree(udc);
return retval;
}
static int lpc32xx_udc_remove(struct platform_device *pdev)
{
struct lpc32xx_udc *udc = platform_get_drvdata(pdev);
usb_del_gadget_udc(&udc->gadget);
if (udc->driver)
return -EBUSY;
udc_clk_set(udc, 1);
udc_disable(udc);
pullup(udc, 0);
free_irq(udc->udp_irq[IRQ_USB_ATX], udc);
device_init_wakeup(&pdev->dev, 0);
remove_debug_file(udc);
dma_pool_destroy(udc->dd_cache);
dma_free_coherent(&pdev->dev, UDCA_BUFF_SIZE,
udc->udca_v_base, udc->udca_p_base);
free_irq(udc->udp_irq[IRQ_USB_DEVDMA], udc);
free_irq(udc->udp_irq[IRQ_USB_HP], udc);
free_irq(udc->udp_irq[IRQ_USB_LP], udc);
clk_disable(udc->usb_otg_clk);
clk_put(udc->usb_otg_clk);
clk_disable(udc->usb_slv_clk);
clk_put(udc->usb_slv_clk);
clk_disable(udc->usb_pll_clk);
clk_put(udc->usb_pll_clk);
iounmap(udc->udp_baseaddr);
release_mem_region(udc->io_p_start, udc->io_p_size);
kfree(udc);
return 0;
}
#ifdef CONFIG_PM
static int lpc32xx_udc_suspend(struct platform_device *pdev, pm_message_t mesg)
{
struct lpc32xx_udc *udc = platform_get_drvdata(pdev);
if (udc->clocked) {
/* Power down ISP */
udc->poweron = 0;
isp1301_set_powerstate(udc, 0);
/* Disable clocking */
udc_clk_set(udc, 0);
/* Keep clock flag on, so we know to re-enable clocks
on resume */
udc->clocked = 1;
/* Kill global USB clock */
clk_disable(udc->usb_slv_clk);
}
return 0;
}
static int lpc32xx_udc_resume(struct platform_device *pdev)
{
struct lpc32xx_udc *udc = platform_get_drvdata(pdev);
if (udc->clocked) {
/* Enable global USB clock */
clk_enable(udc->usb_slv_clk);
/* Enable clocking */
udc_clk_set(udc, 1);
/* ISP back to normal power mode */
udc->poweron = 1;
isp1301_set_powerstate(udc, 1);
}
return 0;
}
#else
#define lpc32xx_udc_suspend NULL
#define lpc32xx_udc_resume NULL
#endif
#ifdef CONFIG_OF
static struct of_device_id lpc32xx_udc_of_match[] = {
{ .compatible = "nxp,lpc3220-udc", },
{ },
};
MODULE_DEVICE_TABLE(of, lpc32xx_udc_of_match);
#endif
static struct platform_driver lpc32xx_udc_driver = {
.remove = lpc32xx_udc_remove,
.shutdown = lpc32xx_udc_shutdown,
.suspend = lpc32xx_udc_suspend,
.resume = lpc32xx_udc_resume,
.driver = {
.name = (char *) driver_name,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(lpc32xx_udc_of_match),
},
};
module_platform_driver_probe(lpc32xx_udc_driver, lpc32xx_udc_probe);
MODULE_DESCRIPTION("LPC32XX udc driver");
MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");
MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:lpc32xx_udc");
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