/*
* 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"
struct sh_mobile_sdhi_of_data {
unsigned long tmio_flags;
};
static const struct sh_mobile_sdhi_of_data sh_mobile_sdhi_of_cfg[] = {
{
.tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
},
};
struct sh_mobile_sdhi {
struct clk *clk;
struct tmio_mmc_data mmc_data;
struct tmio_mmc_dma dma_priv;
};
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 = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
int ret = clk_enable(priv->clk);
if (ret < 0)
return ret;
*f = clk_get_rate(priv->clk);
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 = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
clk_disable(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->pdata->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 void sh_mobile_sdhi_cd_wakeup(const struct platform_device *pdev)
{
mmc_detect_change(platform_get_drvdata(pdev), msecs_to_jiffies(100));
}
static const struct sh_mobile_sdhi_ops sdhi_ops = {
.cd_wakeup = sh_mobile_sdhi_cd_wakeup,
};
static const struct of_device_id sh_mobile_sdhi_of_match[] = {
{ .compatible = "renesas,shmobile-sdhi" },
{ .compatible = "renesas,sh7372-sdhi" },
{ .compatible = "renesas,sh73a0-sdhi", .data = &sh_mobile_sdhi_of_cfg[0], },
{ .compatible = "renesas,r8a73a4-sdhi", .data = &sh_mobile_sdhi_of_cfg[0], },
{ .compatible = "renesas,r8a7740-sdhi", .data = &sh_mobile_sdhi_of_cfg[0], },
{ .compatible = "renesas,r8a7778-sdhi", .data = &sh_mobile_sdhi_of_cfg[0], },
{ .compatible = "renesas,r8a7779-sdhi", .data = &sh_mobile_sdhi_of_cfg[0], },
{ .compatible = "renesas,r8a7790-sdhi", .data = &sh_mobile_sdhi_of_cfg[0], },
{},
};
MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
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 sh_mobile_sdhi_info *p = pdev->dev.platform_data;
struct tmio_mmc_host *host;
int irq, ret, i = 0;
bool multiplexed_isr = true;
struct tmio_mmc_dma *dma_priv;
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;
if (p) {
if (p->init) {
ret = p->init(pdev, &sdhi_ops);
if (ret)
return ret;
}
}
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 eclkget;
}
mmc_data->clk_enable = sh_mobile_sdhi_clk_enable;
mmc_data->clk_disable = sh_mobile_sdhi_clk_disable;
mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
if (p) {
mmc_data->flags = p->tmio_flags;
mmc_data->ocr_mask = p->tmio_ocr_mask;
mmc_data->capabilities |= p->tmio_caps;
mmc_data->capabilities2 |= p->tmio_caps2;
mmc_data->cd_gpio = p->cd_gpio;
if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
/*
* Yes, we have to provide slave IDs twice to TMIO:
* once as a filter parameter and once for channel
* configuration as an explicit slave ID
*/
dma_priv->chan_priv_tx = (void *)p->dma_slave_tx;
dma_priv->chan_priv_rx = (void *)p->dma_slave_rx;
dma_priv->slave_id_tx = p->dma_slave_tx;
dma_priv->slave_id_rx = p->dma_slave_rx;
}
}
dma_priv->alignment_shift = 1; /* 2-byte alignment */
dma_priv->filter = shdma_chan_filter;
mmc_data->dma = dma_priv;
/*
* 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;
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;
}
ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
if (ret < 0)
goto eprobe;
/*
* 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);
eprobe:
eclkget:
if (p && p->cleanup)
p->cleanup(pdev);
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);
struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
tmio_mmc_host_remove(host);
if (p && p->cleanup)
p->cleanup(pdev);
return 0;
}
static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
.suspend = tmio_mmc_host_suspend,
.resume = tmio_mmc_host_resume,
.runtime_suspend = tmio_mmc_host_runtime_suspend,
.runtime_resume = tmio_mmc_host_runtime_resume,
};
static struct platform_driver sh_mobile_sdhi_driver = {
.driver = {
.name = "sh_mobile_sdhi",
.owner = THIS_MODULE,
.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");
