- 根目录:
- drivers
- mmc
- host
- sh_mobile_sdhi.c
/*
* SuperH Mobile SDHI
*
* Copyright (C) 2009 Magnus Damm
*
* 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.
*
* Based on "Compaq ASIC3 support":
*
* Copyright 2001 Compaq Computer Corporation.
* Copyright 2004-2005 Phil Blundell
* Copyright 2007-2008 OpenedHand Ltd.
*
* Authors: Phil Blundell <pb@handhelds.org>,
* Samuel Ortiz <sameo@openedhand.com>
*
*/
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/mmc/host.h>
#include <linux/mmc/sh_mobile_sdhi.h>
#include <linux/mfd/tmio.h>
#include <linux/sh_dma.h>
#include <linux/delay.h>
#include "tmio_mmc.h"
#define EXT_ACC 0xe4
#define host_to_priv(host) container_of((host)->pdata, struct sh_mobile_sdhi, mmc_data)
struct sh_mobile_sdhi_of_data {
unsigned long tmio_flags;
unsigned long capabilities;
unsigned long capabilities2;
enum dma_slave_buswidth dma_buswidth;
dma_addr_t dma_rx_offset;
};
static const struct sh_mobile_sdhi_of_data sh_mobile_sdhi_of_cfg[] = {
{
.tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
},
};
static const struct sh_mobile_sdhi_of_data of_rcar_gen1_compatible = {
.tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
TMIO_MMC_CLK_ACTUAL,
.capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
};
static const struct sh_mobile_sdhi_of_data of_rcar_gen2_compatible = {
.tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
TMIO_MMC_CLK_ACTUAL,
.capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
.dma_buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES,
.dma_rx_offset = 0x2000,
};
static const struct of_device_id sh_mobile_sdhi_of_match[] = {
{ .compatible = "renesas,sdhi-shmobile" },
{ .compatible = "renesas,sdhi-sh7372" },
{ .compatible = "renesas,sdhi-sh73a0", .data = &sh_mobile_sdhi_of_cfg[0], },
{ .compatible = "renesas,sdhi-r8a73a4", .data = &sh_mobile_sdhi_of_cfg[0], },
{ .compatible = "renesas,sdhi-r8a7740", .data = &sh_mobile_sdhi_of_cfg[0], },
{ .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, },
{ .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, },
{ .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, },
{ .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, },
{ .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, },
{ .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, },
{ .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, },
{},
};
MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
struct sh_mobile_sdhi {
struct clk *clk;
struct tmio_mmc_data mmc_data;
struct tmio_mmc_dma dma_priv;
};
static void sh_mobile_sdhi_sdbuf_width(struct tmio_mmc_host *host, int width)
{
u32 val;
/*
* see also
* sh_mobile_sdhi_of_data :: dma_buswidth
*/
switch (sd_ctrl_read16(host, CTL_VERSION)) {
case 0x490C:
val = (width == 32) ? 0x0001 : 0x0000;
break;
case 0xCB0D:
val = (width == 32) ? 0x0000 : 0x0001;
break;
default:
/* nothing to do */
return;
}
sd_ctrl_write16(host, EXT_ACC, val);
}
static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f)
{
struct mmc_host *mmc = platform_get_drvdata(pdev);
struct tmio_mmc_host *host = mmc_priv(mmc);
struct sh_mobile_sdhi *priv = host_to_priv(host);
int ret = clk_prepare_enable(priv->clk);
if (ret < 0)
return ret;
*f = clk_get_rate(priv->clk);
/* enable 16bit data access on SDBUF as default */
sh_mobile_sdhi_sdbuf_width(host, 16);
return 0;
}
static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev)
{
struct mmc_host *mmc = platform_get_drvdata(pdev);
struct tmio_mmc_host *host = mmc_priv(mmc);
struct sh_mobile_sdhi *priv = host_to_priv(host);
clk_disable_unprepare(priv->clk);
}
static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
{
int timeout = 1000;
while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
udelay(1);
if (!timeout) {
dev_warn(&host->pdev->dev, "timeout waiting for SD bus idle\n");
return -EBUSY;
}
return 0;
}
static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
{
switch (addr)
{
case CTL_SD_CMD:
case CTL_STOP_INTERNAL_ACTION:
case CTL_XFER_BLK_COUNT:
case CTL_SD_CARD_CLK_CTL:
case CTL_SD_XFER_LEN:
case CTL_SD_MEM_CARD_OPT:
case CTL_TRANSACTION_CTL:
case CTL_DMA_ENABLE:
return sh_mobile_sdhi_wait_idle(host);
}
return 0;
}
static int sh_mobile_sdhi_multi_io_quirk(struct mmc_card *card,
unsigned int direction, int blk_size)
{
/*
* In Renesas controllers, when performing a
* multiple block read of one or two blocks,
* depending on the timing with which the
* response register is read, the response
* value may not be read properly.
* Use single block read for this HW bug
*/
if ((direction == MMC_DATA_READ) &&
blk_size == 2)
return 1;
return blk_size;
}
static void sh_mobile_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable)
{
sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? 2 : 0);
/* enable 32bit access if DMA mode if possibile */
sh_mobile_sdhi_sdbuf_width(host, enable ? 32 : 16);
}
static int sh_mobile_sdhi_probe(struct platform_device *pdev)
{
const struct of_device_id *of_id =
of_match_device(sh_mobile_sdhi_of_match, &pdev->dev);
struct sh_mobile_sdhi *priv;
struct tmio_mmc_data *mmc_data;
struct tmio_mmc_data *mmd = pdev->dev.platform_data;
struct tmio_mmc_host *host;
struct resource *res;
int irq, ret, i = 0;
bool multiplexed_isr = true;
struct tmio_mmc_dma *dma_priv;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
if (priv == NULL) {
dev_err(&pdev->dev, "kzalloc failed\n");
return -ENOMEM;
}
mmc_data = &priv->mmc_data;
dma_priv = &priv->dma_priv;
priv->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(priv->clk)) {
ret = PTR_ERR(priv->clk);
dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
goto eprobe;
}
host = tmio_mmc_host_alloc(pdev);
if (!host) {
ret = -ENOMEM;
goto eprobe;
}
host->dma = dma_priv;
host->write16_hook = sh_mobile_sdhi_write16_hook;
host->clk_enable = sh_mobile_sdhi_clk_enable;
host->clk_disable = sh_mobile_sdhi_clk_disable;
host->multi_io_quirk = sh_mobile_sdhi_multi_io_quirk;
/* SD control register space size is 0x100, 0x200 for bus_shift=1 */
if (resource_size(res) > 0x100)
host->bus_shift = 1;
else
host->bus_shift = 0;
if (mmd)
*mmc_data = *mmd;
dma_priv->filter = shdma_chan_filter;
dma_priv->enable = sh_mobile_sdhi_enable_dma;
mmc_data->alignment_shift = 1; /* 2-byte alignment */
mmc_data->capabilities |= MMC_CAP_MMC_HIGHSPEED;
/*
* All SDHI blocks support 2-byte and larger block sizes in 4-bit
* bus width mode.
*/
mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
/*
* All SDHI blocks support SDIO IRQ signalling.
*/
mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
/*
* All SDHI have CMD12 controll bit
*/
mmc_data->flags |= TMIO_MMC_HAVE_CMD12_CTRL;
/*
* All SDHI need SDIO_INFO1 reserved bit
*/
mmc_data->flags |= TMIO_MMC_SDIO_STATUS_QUIRK;
if (of_id && of_id->data) {
const struct sh_mobile_sdhi_of_data *of_data = of_id->data;
mmc_data->flags |= of_data->tmio_flags;
mmc_data->capabilities |= of_data->capabilities;
mmc_data->capabilities2 |= of_data->capabilities2;
mmc_data->dma_rx_offset = of_data->dma_rx_offset;
dma_priv->dma_buswidth = of_data->dma_buswidth;
}
ret = tmio_mmc_host_probe(host, mmc_data);
if (ret < 0)
goto efree;
/*
* Allow one or more specific (named) ISRs or
* one or more multiplexed (un-named) ISRs.
*/
irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
if (irq >= 0) {
multiplexed_isr = false;
ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_card_detect_irq, 0,
dev_name(&pdev->dev), host);
if (ret)
goto eirq;
}
irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
if (irq >= 0) {
multiplexed_isr = false;
ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdio_irq, 0,
dev_name(&pdev->dev), host);
if (ret)
goto eirq;
}
irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
if (irq >= 0) {
multiplexed_isr = false;
ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdcard_irq, 0,
dev_name(&pdev->dev), host);
if (ret)
goto eirq;
} else if (!multiplexed_isr) {
dev_err(&pdev->dev,
"Principal SD-card IRQ is missing among named interrupts\n");
ret = irq;
goto eirq;
}
if (multiplexed_isr) {
while (1) {
irq = platform_get_irq(pdev, i);
if (irq < 0)
break;
i++;
ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
dev_name(&pdev->dev), host);
if (ret)
goto eirq;
}
/* There must be at least one IRQ source */
if (!i) {
ret = irq;
goto eirq;
}
}
dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
mmc_hostname(host->mmc), (unsigned long)
(platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
host->mmc->f_max / 1000000);
return ret;
eirq:
tmio_mmc_host_remove(host);
efree:
tmio_mmc_host_free(host);
eprobe:
return ret;
}
static int sh_mobile_sdhi_remove(struct platform_device *pdev)
{
struct mmc_host *mmc = platform_get_drvdata(pdev);
struct tmio_mmc_host *host = mmc_priv(mmc);
tmio_mmc_host_remove(host);
return 0;
}
static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
tmio_mmc_host_runtime_resume,
NULL)
};
static struct platform_driver sh_mobile_sdhi_driver = {
.driver = {
.name = "sh_mobile_sdhi",
.pm = &tmio_mmc_dev_pm_ops,
.of_match_table = sh_mobile_sdhi_of_match,
},
.probe = sh_mobile_sdhi_probe,
.remove = sh_mobile_sdhi_remove,
};
module_platform_driver(sh_mobile_sdhi_driver);
MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
MODULE_AUTHOR("Magnus Damm");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:sh_mobile_sdhi");