forked from Minki/linux
b62d8dbe41
clk_prepare_enable() can fail here and we must check its return value. we must disable clock, if t7l66xb_probe is not successful. Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
452 lines
11 KiB
C
452 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. */
|
|
raw_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;
|
|
int ret;
|
|
|
|
ret = clk_prepare_enable(t7l66xb->clk32k);
|
|
if (ret)
|
|
return ret;
|
|
|
|
raw_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);
|
|
|
|
raw_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;
|
|
|
|
raw_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);
|
|
|
|
raw_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(struct irq_desc *desc)
|
|
{
|
|
struct t7l66xb *t7l66xb = irq_desc_get_handler_data(desc);
|
|
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;
|
|
|
|
raw_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);
|
|
raw_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;
|
|
|
|
raw_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);
|
|
raw_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);
|
|
}
|
|
|
|
irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
|
|
irq_set_chained_handler_and_data(t7l66xb->irq, t7l66xb_irq, t7l66xb);
|
|
}
|
|
|
|
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_and_data(t7l66xb->irq, NULL, NULL);
|
|
|
|
for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
|
|
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);
|
|
int ret;
|
|
|
|
ret = clk_prepare_enable(t7l66xb->clk48m);
|
|
if (ret)
|
|
return ret;
|
|
|
|
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)
|
|
return -EINVAL;
|
|
|
|
iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
|
|
if (!iomem)
|
|
return -EINVAL;
|
|
|
|
t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
|
|
if (!t7l66xb)
|
|
return -ENOMEM;
|
|
|
|
raw_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;
|
|
}
|
|
|
|
ret = clk_prepare_enable(t7l66xb->clk48m);
|
|
if (ret)
|
|
goto err_clk_enable;
|
|
|
|
if (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);
|
|
clk_disable_unprepare(t7l66xb->clk48m);
|
|
err_clk_enable:
|
|
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");
|