mirror of https://gitee.com/openkylin/linux.git
144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
/*
|
|
* 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,
|
|
};
|