mmc: sdhci-pltfm: add -pltfm driver for imx35/51
This driver adds basic support for the esdhc-core found on e.g. imx35/51, as a platform driver. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Anton Vorontsov <cbouatmailru@gmail.com> Tested-by: Eric Bénard <eric@eukrea.com> Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
parent
80872e21b0
commit
95f25efe0c
5 changed files with 158 additions and 0 deletions
|
@ -130,6 +130,16 @@ config MMC_SDHCI_CNS3XXX
|
|||
|
||||
If unsure, say N.
|
||||
|
||||
config MMC_SDHCI_ESDHC_IMX
|
||||
bool "SDHCI platform support for the Freescale eSDHC i.MX controller"
|
||||
depends on MMC_SDHCI_PLTFM && (ARCH_MX25 || ARCH_MX35 || ARCH_MX5)
|
||||
select MMC_SDHCI_IO_ACCESSORS
|
||||
help
|
||||
This selects the Freescale eSDHC controller support on the platform
|
||||
bus, found on platforms like mx35/51.
|
||||
|
||||
If unsure, say N.
|
||||
|
||||
config MMC_SDHCI_S3C
|
||||
tristate "SDHCI support on Samsung S3C SoC"
|
||||
depends on MMC_SDHCI && PLAT_SAMSUNG
|
||||
|
|
|
@ -37,6 +37,7 @@ obj-$(CONFIG_MMC_USHC) += ushc.o
|
|||
obj-$(CONFIG_MMC_SDHCI_PLTFM) += sdhci-platform.o
|
||||
sdhci-platform-y := sdhci-pltfm.o
|
||||
sdhci-platform-$(CONFIG_MMC_SDHCI_CNS3XXX) += sdhci-cns3xxx.o
|
||||
sdhci-platform-$(CONFIG_MMC_SDHCI_ESDHC_IMX) += sdhci-esdhc-imx.o
|
||||
|
||||
obj-$(CONFIG_MMC_SDHCI_OF) += sdhci-of.o
|
||||
sdhci-of-y := sdhci-of-core.o
|
||||
|
|
143
drivers/mmc/host/sdhci-esdhc-imx.c
Normal file
143
drivers/mmc/host/sdhci-esdhc-imx.c
Normal file
|
@ -0,0 +1,143 @@
|
|||
/*
|
||||
* Freescale eSDHC i.MX controller driver for the platform bus.
|
||||
*
|
||||
* derived from the OF-version.
|
||||
*
|
||||
* Copyright (c) 2010 Pengutronix e.K.
|
||||
* Author: Wolfram Sang <w.sang@pengutronix.de>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License.
|
||||
*/
|
||||
|
||||
#include <linux/io.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/clk.h>
|
||||
#include <linux/mmc/host.h>
|
||||
#include <linux/mmc/sdhci-pltfm.h>
|
||||
#include "sdhci.h"
|
||||
#include "sdhci-pltfm.h"
|
||||
#include "sdhci-esdhc.h"
|
||||
|
||||
static inline void esdhc_clrset_le(struct sdhci_host *host, u32 mask, u32 val, int reg)
|
||||
{
|
||||
void __iomem *base = host->ioaddr + (reg & ~0x3);
|
||||
u32 shift = (reg & 0x3) * 8;
|
||||
|
||||
writel(((readl(base) & ~(mask << shift)) | (val << shift)), base);
|
||||
}
|
||||
|
||||
static u16 esdhc_readw_le(struct sdhci_host *host, int reg)
|
||||
{
|
||||
if (unlikely(reg == SDHCI_HOST_VERSION))
|
||||
reg ^= 2;
|
||||
|
||||
return readw(host->ioaddr + reg);
|
||||
}
|
||||
|
||||
static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg)
|
||||
{
|
||||
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
|
||||
|
||||
switch (reg) {
|
||||
case SDHCI_TRANSFER_MODE:
|
||||
/*
|
||||
* Postpone this write, we must do it together with a
|
||||
* command write that is down below.
|
||||
*/
|
||||
pltfm_host->scratchpad = val;
|
||||
return;
|
||||
case SDHCI_COMMAND:
|
||||
writel(val << 16 | pltfm_host->scratchpad,
|
||||
host->ioaddr + SDHCI_TRANSFER_MODE);
|
||||
return;
|
||||
case SDHCI_BLOCK_SIZE:
|
||||
val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
|
||||
break;
|
||||
}
|
||||
esdhc_clrset_le(host, 0xffff, val, reg);
|
||||
}
|
||||
|
||||
static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg)
|
||||
{
|
||||
u32 new_val;
|
||||
|
||||
switch (reg) {
|
||||
case SDHCI_POWER_CONTROL:
|
||||
/*
|
||||
* FSL put some DMA bits here
|
||||
* If your board has a regulator, code should be here
|
||||
*/
|
||||
return;
|
||||
case SDHCI_HOST_CONTROL:
|
||||
/* FSL messed up here, so we can just keep those two */
|
||||
new_val = val & (SDHCI_CTRL_LED | SDHCI_CTRL_4BITBUS);
|
||||
/* ensure the endianess */
|
||||
new_val |= ESDHC_HOST_CONTROL_LE;
|
||||
/* DMA mode bits are shifted */
|
||||
new_val |= (val & SDHCI_CTRL_DMA_MASK) << 5;
|
||||
|
||||
esdhc_clrset_le(host, 0xffff, new_val, reg);
|
||||
return;
|
||||
}
|
||||
esdhc_clrset_le(host, 0xff, val, reg);
|
||||
}
|
||||
|
||||
static unsigned int esdhc_pltfm_get_max_clock(struct sdhci_host *host)
|
||||
{
|
||||
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
|
||||
|
||||
return clk_get_rate(pltfm_host->clk);
|
||||
}
|
||||
|
||||
static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host)
|
||||
{
|
||||
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
|
||||
|
||||
return clk_get_rate(pltfm_host->clk) / 256 / 16;
|
||||
}
|
||||
|
||||
static int esdhc_pltfm_init(struct sdhci_host *host, struct sdhci_pltfm_data *pdata)
|
||||
{
|
||||
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
|
||||
struct clk *clk;
|
||||
|
||||
clk = clk_get(mmc_dev(host->mmc), NULL);
|
||||
if (IS_ERR(clk)) {
|
||||
dev_err(mmc_dev(host->mmc), "clk err\n");
|
||||
return PTR_ERR(clk);
|
||||
}
|
||||
clk_enable(clk);
|
||||
pltfm_host->clk = clk;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void esdhc_pltfm_exit(struct sdhci_host *host)
|
||||
{
|
||||
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
|
||||
|
||||
clk_disable(pltfm_host->clk);
|
||||
clk_put(pltfm_host->clk);
|
||||
}
|
||||
|
||||
static struct sdhci_ops sdhci_esdhc_ops = {
|
||||
.read_w = esdhc_readw_le,
|
||||
.write_w = esdhc_writew_le,
|
||||
.write_b = esdhc_writeb_le,
|
||||
.set_clock = esdhc_set_clock,
|
||||
.get_max_clock = esdhc_pltfm_get_max_clock,
|
||||
.get_min_clock = esdhc_pltfm_get_min_clock,
|
||||
};
|
||||
|
||||
struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = {
|
||||
.quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_NO_MULTIBLOCK
|
||||
| SDHCI_QUIRK_BROKEN_ADMA,
|
||||
/* ADMA has issues. Might be fixable */
|
||||
/* NO_MULTIBLOCK might be MX35 only (Errata: ENGcm07207) */
|
||||
.ops = &sdhci_esdhc_ops,
|
||||
.init = esdhc_pltfm_init,
|
||||
.exit = esdhc_pltfm_exit,
|
||||
};
|
|
@ -166,6 +166,9 @@ static const struct platform_device_id sdhci_pltfm_ids[] = {
|
|||
{ "sdhci", },
|
||||
#ifdef CONFIG_MMC_SDHCI_CNS3XXX
|
||||
{ "sdhci-cns3xxx", (kernel_ulong_t)&sdhci_cns3xxx_pdata },
|
||||
#endif
|
||||
#ifdef CONFIG_MMC_SDHCI_ESDHC_IMX
|
||||
{ "sdhci-esdhc-imx", (kernel_ulong_t)&sdhci_esdhc_imx_pdata },
|
||||
#endif
|
||||
{ },
|
||||
};
|
||||
|
|
|
@ -21,5 +21,6 @@ struct sdhci_pltfm_host {
|
|||
};
|
||||
|
||||
extern struct sdhci_pltfm_data sdhci_cns3xxx_pdata;
|
||||
extern struct sdhci_pltfm_data sdhci_esdhc_imx_pdata;
|
||||
|
||||
#endif /* _DRIVERS_MMC_SDHCI_PLTFM_H */
|
||||
|
|
Reference in a new issue