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linux/drivers/mmc/host/sdhci-pxav2.c
Chris Ball b650352dd3 mmc: sdhci-pxa: Add device tree support 
Tested on an OLPC XO-1.75.  (MMP2, sdhci-pxav3, CONFIG_MACH_MMP2_DT=y)

Signed-off-by: Chris Ball <cjb@laptop.org>
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>
2012-07-21 00:01:47 -04:00

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/*
* Copyright (C) 2010 Marvell International Ltd.
* Zhangfei Gao <zhangfei.gao@marvell.com>
* Kevin Wang <dwang4@marvell.com>
* Jun Nie <njun@marvell.com>
* Qiming Wu <wuqm@marvell.com>
* Philip Rakity <prakity@marvell.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/err.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
#include <linux/platform_data/pxa_sdhci.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include "sdhci.h"
#include "sdhci-pltfm.h"
#define SD_FIFO_PARAM 0xe0
#define DIS_PAD_SD_CLK_GATE 0x0400 /* Turn on/off Dynamic SD Clock Gating */
#define CLK_GATE_ON 0x0200 /* Disable/enable Clock Gate */
#define CLK_GATE_CTL 0x0100 /* Clock Gate Control */
#define CLK_GATE_SETTING_BITS (DIS_PAD_SD_CLK_GATE | \
CLK_GATE_ON | CLK_GATE_CTL)
#define SD_CLOCK_BURST_SIZE_SETUP 0xe6
#define SDCLK_SEL_SHIFT 8
#define SDCLK_SEL_MASK 0x3
#define SDCLK_DELAY_SHIFT 10
#define SDCLK_DELAY_MASK 0x3c
#define SD_CE_ATA_2 0xea
#define MMC_CARD 0x1000
#define MMC_WIDTH 0x0100
static void pxav2_set_private_registers(struct sdhci_host *host, u8 mask)
{
struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
if (mask == SDHCI_RESET_ALL) {
u16 tmp = 0;
/*
* tune timing of read data/command when crc error happen
* no performance impact
*/
if (pdata && pdata->clk_delay_sel == 1) {
tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
tmp &= ~(SDCLK_DELAY_MASK << SDCLK_DELAY_SHIFT);
tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK)
<< SDCLK_DELAY_SHIFT;
tmp &= ~(SDCLK_SEL_MASK << SDCLK_SEL_SHIFT);
tmp |= (1 & SDCLK_SEL_MASK) << SDCLK_SEL_SHIFT;
writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
}
if (pdata && (pdata->flags & PXA_FLAG_ENABLE_CLOCK_GATING)) {
tmp = readw(host->ioaddr + SD_FIFO_PARAM);
tmp &= ~CLK_GATE_SETTING_BITS;
writew(tmp, host->ioaddr + SD_FIFO_PARAM);
} else {
tmp = readw(host->ioaddr + SD_FIFO_PARAM);
tmp &= ~CLK_GATE_SETTING_BITS;
tmp |= CLK_GATE_SETTING_BITS;
writew(tmp, host->ioaddr + SD_FIFO_PARAM);
}
}
}
static int pxav2_mmc_set_width(struct sdhci_host *host, int width)
{
u8 ctrl;
u16 tmp;
ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
tmp = readw(host->ioaddr + SD_CE_ATA_2);
if (width == MMC_BUS_WIDTH_8) {
ctrl &= ~SDHCI_CTRL_4BITBUS;
tmp |= MMC_CARD | MMC_WIDTH;
} else {
tmp &= ~(MMC_CARD | MMC_WIDTH);
if (width == MMC_BUS_WIDTH_4)
ctrl |= SDHCI_CTRL_4BITBUS;
else
ctrl &= ~SDHCI_CTRL_4BITBUS;
}
writew(tmp, host->ioaddr + SD_CE_ATA_2);
writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
return 0;
}
static u32 pxav2_get_max_clock(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
return clk_get_rate(pltfm_host->clk);
}
static struct sdhci_ops pxav2_sdhci_ops = {
.get_max_clock = pxav2_get_max_clock,
.platform_reset_exit = pxav2_set_private_registers,
.platform_8bit_width = pxav2_mmc_set_width,
};
#ifdef CONFIG_OF
static const struct of_device_id sdhci_pxav2_of_match[] = {
{
.compatible = "mrvl,pxav2-mmc",
},
{},
};
MODULE_DEVICE_TABLE(of, sdhci_pxav2_of_match);
static struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)
{
struct sdhci_pxa_platdata *pdata;
struct device_node *np = dev->of_node;
u32 bus_width;
u32 clk_delay_cycles;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return NULL;
if (of_find_property(np, "non-removable", NULL))
pdata->flags |= PXA_FLAG_CARD_PERMANENT;
of_property_read_u32(np, "bus-width", &bus_width);
if (bus_width == 8)
pdata->flags |= PXA_FLAG_SD_8_BIT_CAPABLE_SLOT;
of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles);
if (clk_delay_cycles > 0) {
pdata->clk_delay_sel = 1;
pdata->clk_delay_cycles = clk_delay_cycles;
}
return pdata;
}
#else
static inline struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)
{
return NULL;
}
#endif
static int __devinit sdhci_pxav2_probe(struct platform_device *pdev)
{
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
struct device *dev = &pdev->dev;
struct sdhci_host *host = NULL;
struct sdhci_pxa *pxa = NULL;
const struct of_device_id *match;
int ret;
struct clk *clk;
pxa = kzalloc(sizeof(struct sdhci_pxa), GFP_KERNEL);
if (!pxa)
return -ENOMEM;
host = sdhci_pltfm_init(pdev, NULL);
if (IS_ERR(host)) {
kfree(pxa);
return PTR_ERR(host);
}
pltfm_host = sdhci_priv(host);
pltfm_host->priv = pxa;
clk = clk_get(dev, "PXA-SDHCLK");
if (IS_ERR(clk)) {
dev_err(dev, "failed to get io clock\n");
ret = PTR_ERR(clk);
goto err_clk_get;
}
pltfm_host->clk = clk;
clk_enable(clk);
host->quirks = SDHCI_QUIRK_BROKEN_ADMA
| SDHCI_QUIRK_BROKEN_TIMEOUT_VAL
| SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN;
match = of_match_device(of_match_ptr(sdhci_pxav2_of_match), &pdev->dev);
if (match) {
pdata = pxav2_get_mmc_pdata(dev);
}
if (pdata) {
if (pdata->flags & PXA_FLAG_CARD_PERMANENT) {
/* on-chip device */
host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
host->mmc->caps |= MMC_CAP_NONREMOVABLE;
}
/* If slot design supports 8 bit data, indicate this to MMC. */
if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
host->mmc->caps |= MMC_CAP_8_BIT_DATA;
if (pdata->quirks)
host->quirks |= pdata->quirks;
if (pdata->host_caps)
host->mmc->caps |= pdata->host_caps;
if (pdata->pm_caps)
host->mmc->pm_caps |= pdata->pm_caps;
}
host->ops = &pxav2_sdhci_ops;
ret = sdhci_add_host(host);
if (ret) {
dev_err(&pdev->dev, "failed to add host\n");
goto err_add_host;
}
platform_set_drvdata(pdev, host);
return 0;
err_add_host:
clk_disable(clk);
clk_put(clk);
err_clk_get:
sdhci_pltfm_free(pdev);
kfree(pxa);
return ret;
}
static int __devexit sdhci_pxav2_remove(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_pxa *pxa = pltfm_host->priv;
sdhci_remove_host(host, 1);
clk_disable(pltfm_host->clk);
clk_put(pltfm_host->clk);
sdhci_pltfm_free(pdev);
kfree(pxa);
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct platform_driver sdhci_pxav2_driver = {
.driver = {
.name = "sdhci-pxav2",
.owner = THIS_MODULE,
#ifdef CONFIG_OF
.of_match_table = sdhci_pxav2_of_match,
#endif
.pm = SDHCI_PLTFM_PMOPS,
},
.probe = sdhci_pxav2_probe,
.remove = __devexit_p(sdhci_pxav2_remove),
};
module_platform_driver(sdhci_pxav2_driver);
MODULE_DESCRIPTION("SDHCI driver for pxav2");
MODULE_AUTHOR("Marvell International Ltd.");
MODULE_LICENSE("GPL v2");
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