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kernel-ark/include/linux/pxa2xx_ssp.h
Mika Westerberg a0d2642e92 spi/pxa2xx: add support for Intel Low Power Subsystem SPI 
Intel LPSS SPI is pretty much the same as the PXA27xx SPI except that it
has few additional features over the original:

	o FIFO depth is 256 entries
	o RX FIFO has one watermark
	o TX FIFO has two watermarks, low and high
	o chip select can be controlled by writing to a register

The new FIFO registers follow immediately the PXA27xx registers but then there
are some additional LPSS private registers at offset 1k or 2k from the base
address. For these private registers we add new accessors that take advantage
of drv_data->lpss_base once it is resolved.

We add a new type LPSS_SSP that can be used to distinguish the LPSS devices
from others.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Lu Cao <lucao@marvell.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2013-02-08 13:14:40 +00:00

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/*
* pxa2xx_ssp.h
*
* Copyright (C) 2003 Russell King, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This driver supports the following PXA CPU/SSP ports:-
*
* PXA250 SSP
* PXA255 SSP, NSSP
* PXA26x SSP, NSSP, ASSP
* PXA27x SSP1, SSP2, SSP3
* PXA3xx SSP1, SSP2, SSP3, SSP4
*/
#ifndef __LINUX_SSP_H
#define __LINUX_SSP_H
#include <linux/list.h>
#include <linux/io.h>
/*
* SSP Serial Port Registers
* PXA250, PXA255, PXA26x and PXA27x SSP controllers are all slightly different.
* PXA255, PXA26x and PXA27x have extra ports, registers and bits.
*/
#define SSCR0 (0x00) /* SSP Control Register 0 */
#define SSCR1 (0x04) /* SSP Control Register 1 */
#define SSSR (0x08) /* SSP Status Register */
#define SSITR (0x0C) /* SSP Interrupt Test Register */
#define SSDR (0x10) /* SSP Data Write/Data Read Register */
#define SSTO (0x28) /* SSP Time Out Register */
#define SSPSP (0x2C) /* SSP Programmable Serial Protocol */
#define SSTSA (0x30) /* SSP Tx Timeslot Active */
#define SSRSA (0x34) /* SSP Rx Timeslot Active */
#define SSTSS (0x38) /* SSP Timeslot Status */
#define SSACD (0x3C) /* SSP Audio Clock Divider */
#define SSACDD (0x40) /* SSP Audio Clock Dither Divider */
/* Common PXA2xx bits first */
#define SSCR0_DSS (0x0000000f) /* Data Size Select (mask) */
#define SSCR0_DataSize(x) ((x) - 1) /* Data Size Select [4..16] */
#define SSCR0_FRF (0x00000030) /* FRame Format (mask) */
#define SSCR0_Motorola (0x0 << 4) /* Motorola's Serial Peripheral Interface (SPI) */
#define SSCR0_TI (0x1 << 4) /* Texas Instruments' Synchronous Serial Protocol (SSP) */
#define SSCR0_National (0x2 << 4) /* National Microwire */
#define SSCR0_ECS (1 << 6) /* External clock select */
#define SSCR0_SSE (1 << 7) /* Synchronous Serial Port Enable */
#define SSCR0_SCR(x) ((x) << 8) /* Serial Clock Rate (mask) */
/* PXA27x, PXA3xx */
#define SSCR0_EDSS (1 << 20) /* Extended data size select */
#define SSCR0_NCS (1 << 21) /* Network clock select */
#define SSCR0_RIM (1 << 22) /* Receive FIFO overrrun interrupt mask */
#define SSCR0_TUM (1 << 23) /* Transmit FIFO underrun interrupt mask */
#define SSCR0_FRDC (0x07000000) /* Frame rate divider control (mask) */
#define SSCR0_SlotsPerFrm(x) (((x) - 1) << 24) /* Time slots per frame [1..8] */
#define SSCR0_FPCKE (1 << 29) /* FIFO packing enable */
#define SSCR0_ACS (1 << 30) /* Audio clock select */
#define SSCR0_MOD (1 << 31) /* Mode (normal or network) */
#define SSCR1_RIE (1 << 0) /* Receive FIFO Interrupt Enable */
#define SSCR1_TIE (1 << 1) /* Transmit FIFO Interrupt Enable */
#define SSCR1_LBM (1 << 2) /* Loop-Back Mode */
#define SSCR1_SPO (1 << 3) /* Motorola SPI SSPSCLK polarity setting */
#define SSCR1_SPH (1 << 4) /* Motorola SPI SSPSCLK phase setting */
#define SSCR1_MWDS (1 << 5) /* Microwire Transmit Data Size */
#define SSSR_ALT_FRM_MASK 3 /* Masks the SFRM signal number */
#define SSSR_TNF (1 << 2) /* Transmit FIFO Not Full */
#define SSSR_RNE (1 << 3) /* Receive FIFO Not Empty */
#define SSSR_BSY (1 << 4) /* SSP Busy */
#define SSSR_TFS (1 << 5) /* Transmit FIFO Service Request */
#define SSSR_RFS (1 << 6) /* Receive FIFO Service Request */
#define SSSR_ROR (1 << 7) /* Receive FIFO Overrun */
#ifdef CONFIG_ARCH_PXA
#define RX_THRESH_DFLT 8
#define TX_THRESH_DFLT 8
#define SSSR_TFL_MASK (0xf << 8) /* Transmit FIFO Level mask */
#define SSSR_RFL_MASK (0xf << 12) /* Receive FIFO Level mask */
#define SSCR1_TFT (0x000003c0) /* Transmit FIFO Threshold (mask) */
#define SSCR1_TxTresh(x) (((x) - 1) << 6) /* level [1..16] */
#define SSCR1_RFT (0x00003c00) /* Receive FIFO Threshold (mask) */
#define SSCR1_RxTresh(x) (((x) - 1) << 10) /* level [1..16] */
#else
#define RX_THRESH_DFLT 2
#define TX_THRESH_DFLT 2
#define SSSR_TFL_MASK (0x3 << 8) /* Transmit FIFO Level mask */
#define SSSR_RFL_MASK (0x3 << 12) /* Receive FIFO Level mask */
#define SSCR1_TFT (0x000000c0) /* Transmit FIFO Threshold (mask) */
#define SSCR1_TxTresh(x) (((x) - 1) << 6) /* level [1..4] */
#define SSCR1_RFT (0x00000c00) /* Receive FIFO Threshold (mask) */
#define SSCR1_RxTresh(x) (((x) - 1) << 10) /* level [1..4] */
#endif
/* extra bits in PXA255, PXA26x and PXA27x SSP ports */
#define SSCR0_TISSP (1 << 4) /* TI Sync Serial Protocol */
#define SSCR0_PSP (3 << 4) /* PSP - Programmable Serial Protocol */
#define SSCR1_TTELP (1 << 31) /* TXD Tristate Enable Last Phase */
#define SSCR1_TTE (1 << 30) /* TXD Tristate Enable */
#define SSCR1_EBCEI (1 << 29) /* Enable Bit Count Error interrupt */
#define SSCR1_SCFR (1 << 28) /* Slave Clock free Running */
#define SSCR1_ECRA (1 << 27) /* Enable Clock Request A */
#define SSCR1_ECRB (1 << 26) /* Enable Clock request B */
#define SSCR1_SCLKDIR (1 << 25) /* Serial Bit Rate Clock Direction */
#define SSCR1_SFRMDIR (1 << 24) /* Frame Direction */
#define SSCR1_RWOT (1 << 23) /* Receive Without Transmit */
#define SSCR1_TRAIL (1 << 22) /* Trailing Byte */
#define SSCR1_TSRE (1 << 21) /* Transmit Service Request Enable */
#define SSCR1_RSRE (1 << 20) /* Receive Service Request Enable */
#define SSCR1_TINTE (1 << 19) /* Receiver Time-out Interrupt enable */
#define SSCR1_PINTE (1 << 18) /* Peripheral Trailing Byte Interrupt Enable */
#define SSCR1_IFS (1 << 16) /* Invert Frame Signal */
#define SSCR1_STRF (1 << 15) /* Select FIFO or EFWR */
#define SSCR1_EFWR (1 << 14) /* Enable FIFO Write/Read */
#define SSSR_BCE (1 << 23) /* Bit Count Error */
#define SSSR_CSS (1 << 22) /* Clock Synchronisation Status */
#define SSSR_TUR (1 << 21) /* Transmit FIFO Under Run */
#define SSSR_EOC (1 << 20) /* End Of Chain */
#define SSSR_TINT (1 << 19) /* Receiver Time-out Interrupt */
#define SSSR_PINT (1 << 18) /* Peripheral Trailing Byte Interrupt */
#define SSPSP_SCMODE(x) ((x) << 0) /* Serial Bit Rate Clock Mode */
#define SSPSP_SFRMP (1 << 2) /* Serial Frame Polarity */
#define SSPSP_ETDS (1 << 3) /* End of Transfer data State */
#define SSPSP_STRTDLY(x) ((x) << 4) /* Start Delay */
#define SSPSP_DMYSTRT(x) ((x) << 7) /* Dummy Start */
#define SSPSP_SFRMDLY(x) ((x) << 9) /* Serial Frame Delay */
#define SSPSP_SFRMWDTH(x) ((x) << 16) /* Serial Frame Width */
#define SSPSP_DMYSTOP(x) ((x) << 23) /* Dummy Stop */
#define SSPSP_FSRT (1 << 25) /* Frame Sync Relative Timing */
/* PXA3xx */
#define SSPSP_EDMYSTRT(x) ((x) << 26) /* Extended Dummy Start */
#define SSPSP_EDMYSTOP(x) ((x) << 28) /* Extended Dummy Stop */
#define SSPSP_TIMING_MASK (0x7f8001f0)
#define SSACD_SCDB (1 << 3) /* SSPSYSCLK Divider Bypass */
#define SSACD_ACPS(x) ((x) << 4) /* Audio clock PLL select */
#define SSACD_ACDS(x) ((x) << 0) /* Audio clock divider select */
#define SSACD_SCDX8 (1 << 7) /* SYSCLK division ratio select */
/* LPSS SSP */
#define SSITF 0x44 /* TX FIFO trigger level */
#define SSITF_TxLoThresh(x) (((x) - 1) << 8)
#define SSITF_TxHiThresh(x) ((x) - 1)
#define SSIRF 0x48 /* RX FIFO trigger level */
#define SSIRF_RxThresh(x) ((x) - 1)
enum pxa_ssp_type {
SSP_UNDEFINED = 0,
PXA25x_SSP, /* pxa 210, 250, 255, 26x */
PXA25x_NSSP, /* pxa 255, 26x (including ASSP) */
PXA27x_SSP,
PXA3xx_SSP,
PXA168_SSP,
PXA910_SSP,
CE4100_SSP,
LPSS_SSP,
};
struct ssp_device {
struct platform_device *pdev;
struct list_head node;
struct clk *clk;
void __iomem *mmio_base;
unsigned long phys_base;
const char *label;
int port_id;
int type;
int use_count;
int irq;
int drcmr_rx;
int drcmr_tx;
};
/**
* pxa_ssp_write_reg - Write to a SSP register
*
* @dev: SSP device to access
* @reg: Register to write to
* @val: Value to be written.
*/
static inline void pxa_ssp_write_reg(struct ssp_device *dev, u32 reg, u32 val)
{
__raw_writel(val, dev->mmio_base + reg);
}
/**
* pxa_ssp_read_reg - Read from a SSP register
*
* @dev: SSP device to access
* @reg: Register to read from
*/
static inline u32 pxa_ssp_read_reg(struct ssp_device *dev, u32 reg)
{
return __raw_readl(dev->mmio_base + reg);
}
#ifdef CONFIG_ARCH_PXA
struct ssp_device *pxa_ssp_request(int port, const char *label);
void pxa_ssp_free(struct ssp_device *);
#else
static inline struct ssp_device *pxa_ssp_request(int port, const char *label)
{
return NULL;
}
static inline void pxa_ssp_free(struct ssp_device *ssp) {}
#endif
#endif
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