kernel-ark/drivers/mfd/t7l66xb.c
Linus Torvalds e6b5be2be4 Driver core patches for 3.19-rc1
Here's the set of driver core patches for 3.19-rc1.
 
 They are dominated by the removal of the .owner field in platform
 drivers.  They touch a lot of files, but they are "simple" changes, just
 removing a line in a structure.
 
 Other than that, a few minor driver core and debugfs changes.  There are
 some ath9k patches coming in through this tree that have been acked by
 the wireless maintainers as they relied on the debugfs changes.
 
 Everything has been in linux-next for a while.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core update from Greg KH:
 "Here's the set of driver core patches for 3.19-rc1.

  They are dominated by the removal of the .owner field in platform
  drivers.  They touch a lot of files, but they are "simple" changes,
  just removing a line in a structure.

  Other than that, a few minor driver core and debugfs changes.  There
  are some ath9k patches coming in through this tree that have been
  acked by the wireless maintainers as they relied on the debugfs
  changes.

  Everything has been in linux-next for a while"

* tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits)
  Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries"
  fs: debugfs: add forward declaration for struct device type
  firmware class: Deletion of an unnecessary check before the function call "vunmap"
  firmware loader: fix hung task warning dump
  devcoredump: provide a one-way disable function
  device: Add dev_<level>_once variants
  ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries
  ath: use seq_file api for ath9k debugfs files
  debugfs: add helper function to create device related seq_file
  drivers/base: cacheinfo: remove noisy error boot message
  Revert "core: platform: add warning if driver has no owner"
  drivers: base: support cpu cache information interface to userspace via sysfs
  drivers: base: add cpu_device_create to support per-cpu devices
  topology: replace custom attribute macros with standard DEVICE_ATTR*
  cpumask: factor out show_cpumap into separate helper function
  driver core: Fix unbalanced device reference in drivers_probe
  driver core: fix race with userland in device_add()
  sysfs/kernfs: make read requests on pre-alloc files use the buffer.
  sysfs/kernfs: allow attributes to request write buffer be pre-allocated.
  fs: sysfs: return EGBIG on write if offset is larger than file size
  ...
2014-12-14 16:10:09 -08:00

449 lines
11 KiB
C

/*
*
* Toshiba T7L66XB core mfd support
*
* Copyright (c) 2005, 2007, 2008 Ian Molton
* Copyright (c) 2008 Dmitry Baryshkov
*
* 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.
*
* T7L66 features:
*
* Supported in this driver:
* SD/MMC
* SM/NAND flash controller
*
* As yet not supported
* GPIO interface (on NAND pins)
* Serial interface
* TFT 'interface converter'
* PCMCIA interface logic
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tmio.h>
#include <linux/mfd/t7l66xb.h>
enum {
T7L66XB_CELL_NAND,
T7L66XB_CELL_MMC,
};
static const struct resource t7l66xb_mmc_resources[] = {
{
.start = 0x800,
.end = 0x9ff,
.flags = IORESOURCE_MEM,
},
{
.start = IRQ_T7L66XB_MMC,
.end = IRQ_T7L66XB_MMC,
.flags = IORESOURCE_IRQ,
},
};
#define SCR_REVID 0x08 /* b Revision ID */
#define SCR_IMR 0x42 /* b Interrupt Mask */
#define SCR_DEV_CTL 0xe0 /* b Device control */
#define SCR_ISR 0xe1 /* b Interrupt Status */
#define SCR_GPO_OC 0xf0 /* b GPO output control */
#define SCR_GPO_OS 0xf1 /* b GPO output enable */
#define SCR_GPI_S 0xf2 /* w GPI status */
#define SCR_APDC 0xf8 /* b Active pullup down ctrl */
#define SCR_DEV_CTL_USB BIT(0) /* USB enable */
#define SCR_DEV_CTL_MMC BIT(1) /* MMC enable */
/*--------------------------------------------------------------------------*/
struct t7l66xb {
void __iomem *scr;
/* Lock to protect registers requiring read/modify/write ops. */
spinlock_t lock;
struct resource rscr;
struct clk *clk48m;
struct clk *clk32k;
int irq;
int irq_base;
};
/*--------------------------------------------------------------------------*/
static int t7l66xb_mmc_enable(struct platform_device *mmc)
{
struct platform_device *dev = to_platform_device(mmc->dev.parent);
struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
unsigned long flags;
u8 dev_ctl;
clk_prepare_enable(t7l66xb->clk32k);
spin_lock_irqsave(&t7l66xb->lock, flags);
dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
dev_ctl |= SCR_DEV_CTL_MMC;
tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
spin_unlock_irqrestore(&t7l66xb->lock, flags);
tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
t7l66xb_mmc_resources[0].start & 0xfffe);
return 0;
}
static int t7l66xb_mmc_disable(struct platform_device *mmc)
{
struct platform_device *dev = to_platform_device(mmc->dev.parent);
struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
unsigned long flags;
u8 dev_ctl;
spin_lock_irqsave(&t7l66xb->lock, flags);
dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
dev_ctl &= ~SCR_DEV_CTL_MMC;
tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
spin_unlock_irqrestore(&t7l66xb->lock, flags);
clk_disable_unprepare(t7l66xb->clk32k);
return 0;
}
static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
{
struct platform_device *dev = to_platform_device(mmc->dev.parent);
struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state);
}
static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
{
struct platform_device *dev = to_platform_device(mmc->dev.parent);
struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state);
}
/*--------------------------------------------------------------------------*/
static struct tmio_mmc_data t7166xb_mmc_data = {
.hclk = 24000000,
.set_pwr = t7l66xb_mmc_pwr,
.set_clk_div = t7l66xb_mmc_clk_div,
};
static const struct resource t7l66xb_nand_resources[] = {
{
.start = 0xc00,
.end = 0xc07,
.flags = IORESOURCE_MEM,
},
{
.start = 0x0100,
.end = 0x01ff,
.flags = IORESOURCE_MEM,
},
{
.start = IRQ_T7L66XB_NAND,
.end = IRQ_T7L66XB_NAND,
.flags = IORESOURCE_IRQ,
},
};
static struct mfd_cell t7l66xb_cells[] = {
[T7L66XB_CELL_MMC] = {
.name = "tmio-mmc",
.enable = t7l66xb_mmc_enable,
.disable = t7l66xb_mmc_disable,
.platform_data = &t7166xb_mmc_data,
.pdata_size = sizeof(t7166xb_mmc_data),
.num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
.resources = t7l66xb_mmc_resources,
},
[T7L66XB_CELL_NAND] = {
.name = "tmio-nand",
.num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
.resources = t7l66xb_nand_resources,
},
};
/*--------------------------------------------------------------------------*/
/* Handle the T7L66XB interrupt mux */
static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc)
{
struct t7l66xb *t7l66xb = irq_get_handler_data(irq);
unsigned int isr;
unsigned int i, irq_base;
irq_base = t7l66xb->irq_base;
while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
for (i = 0; i < T7L66XB_NR_IRQS; i++)
if (isr & (1 << i))
generic_handle_irq(irq_base + i);
}
static void t7l66xb_irq_mask(struct irq_data *data)
{
struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
unsigned long flags;
u8 imr;
spin_lock_irqsave(&t7l66xb->lock, flags);
imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
imr |= 1 << (data->irq - t7l66xb->irq_base);
tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
spin_unlock_irqrestore(&t7l66xb->lock, flags);
}
static void t7l66xb_irq_unmask(struct irq_data *data)
{
struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
unsigned long flags;
u8 imr;
spin_lock_irqsave(&t7l66xb->lock, flags);
imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
imr &= ~(1 << (data->irq - t7l66xb->irq_base));
tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
spin_unlock_irqrestore(&t7l66xb->lock, flags);
}
static struct irq_chip t7l66xb_chip = {
.name = "t7l66xb",
.irq_ack = t7l66xb_irq_mask,
.irq_mask = t7l66xb_irq_mask,
.irq_unmask = t7l66xb_irq_unmask,
};
/*--------------------------------------------------------------------------*/
/* Install the IRQ handler */
static void t7l66xb_attach_irq(struct platform_device *dev)
{
struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
unsigned int irq, irq_base;
irq_base = t7l66xb->irq_base;
for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
irq_set_chip_and_handler(irq, &t7l66xb_chip, handle_level_irq);
irq_set_chip_data(irq, t7l66xb);
#ifdef CONFIG_ARM
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
#endif
}
irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
irq_set_handler_data(t7l66xb->irq, t7l66xb);
irq_set_chained_handler(t7l66xb->irq, t7l66xb_irq);
}
static void t7l66xb_detach_irq(struct platform_device *dev)
{
struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
unsigned int irq, irq_base;
irq_base = t7l66xb->irq_base;
irq_set_chained_handler(t7l66xb->irq, NULL);
irq_set_handler_data(t7l66xb->irq, NULL);
for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
#ifdef CONFIG_ARM
set_irq_flags(irq, 0);
#endif
irq_set_chip(irq, NULL);
irq_set_chip_data(irq, NULL);
}
}
/*--------------------------------------------------------------------------*/
#ifdef CONFIG_PM
static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
{
struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
if (pdata && pdata->suspend)
pdata->suspend(dev);
clk_disable_unprepare(t7l66xb->clk48m);
return 0;
}
static int t7l66xb_resume(struct platform_device *dev)
{
struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
clk_prepare_enable(t7l66xb->clk48m);
if (pdata && pdata->resume)
pdata->resume(dev);
tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
t7l66xb_mmc_resources[0].start & 0xfffe);
return 0;
}
#else
#define t7l66xb_suspend NULL
#define t7l66xb_resume NULL
#endif
/*--------------------------------------------------------------------------*/
static int t7l66xb_probe(struct platform_device *dev)
{
struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
struct t7l66xb *t7l66xb;
struct resource *iomem, *rscr;
int ret;
if (pdata == NULL)
return -EINVAL;
iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (!iomem)
return -EINVAL;
t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
if (!t7l66xb)
return -ENOMEM;
spin_lock_init(&t7l66xb->lock);
platform_set_drvdata(dev, t7l66xb);
ret = platform_get_irq(dev, 0);
if (ret >= 0)
t7l66xb->irq = ret;
else
goto err_noirq;
t7l66xb->irq_base = pdata->irq_base;
t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
if (IS_ERR(t7l66xb->clk32k)) {
ret = PTR_ERR(t7l66xb->clk32k);
goto err_clk32k_get;
}
t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
if (IS_ERR(t7l66xb->clk48m)) {
ret = PTR_ERR(t7l66xb->clk48m);
goto err_clk48m_get;
}
rscr = &t7l66xb->rscr;
rscr->name = "t7l66xb-core";
rscr->start = iomem->start;
rscr->end = iomem->start + 0xff;
rscr->flags = IORESOURCE_MEM;
ret = request_resource(iomem, rscr);
if (ret)
goto err_request_scr;
t7l66xb->scr = ioremap(rscr->start, resource_size(rscr));
if (!t7l66xb->scr) {
ret = -ENOMEM;
goto err_ioremap;
}
clk_prepare_enable(t7l66xb->clk48m);
if (pdata && pdata->enable)
pdata->enable(dev);
/* Mask all interrupts */
tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
(unsigned long)iomem->start, t7l66xb->irq);
t7l66xb_attach_irq(dev);
t7l66xb_cells[T7L66XB_CELL_NAND].platform_data = pdata->nand_data;
t7l66xb_cells[T7L66XB_CELL_NAND].pdata_size = sizeof(*pdata->nand_data);
ret = mfd_add_devices(&dev->dev, dev->id,
t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
iomem, t7l66xb->irq_base, NULL);
if (!ret)
return 0;
t7l66xb_detach_irq(dev);
iounmap(t7l66xb->scr);
err_ioremap:
release_resource(&t7l66xb->rscr);
err_request_scr:
clk_put(t7l66xb->clk48m);
err_clk48m_get:
clk_put(t7l66xb->clk32k);
err_clk32k_get:
err_noirq:
kfree(t7l66xb);
return ret;
}
static int t7l66xb_remove(struct platform_device *dev)
{
struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
int ret;
ret = pdata->disable(dev);
clk_disable_unprepare(t7l66xb->clk48m);
clk_put(t7l66xb->clk48m);
clk_disable_unprepare(t7l66xb->clk32k);
clk_put(t7l66xb->clk32k);
t7l66xb_detach_irq(dev);
iounmap(t7l66xb->scr);
release_resource(&t7l66xb->rscr);
mfd_remove_devices(&dev->dev);
kfree(t7l66xb);
return ret;
}
static struct platform_driver t7l66xb_platform_driver = {
.driver = {
.name = "t7l66xb",
},
.suspend = t7l66xb_suspend,
.resume = t7l66xb_resume,
.probe = t7l66xb_probe,
.remove = t7l66xb_remove,
};
/*--------------------------------------------------------------------------*/
module_platform_driver(t7l66xb_platform_driver);
MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Ian Molton");
MODULE_ALIAS("platform:t7l66xb");