kernel-fxtec-pro1x/arch/arm/mach-omap2/msdi.c
Tony Lindgren b955eefc46 ARM: OMAP2: Use hwmod to initialize mmc for 2420
This allows us to pass dma request lines in platform data to
MMC driver the same way as we already do for omap2430 and later.

Also note that we need to only build this code if MMC_OMAP
is selected, so change Makefile accordingly and place it near
the MMC_OMAP_HS in the Makefile.

Signed-off-by: Tony Lindgren <tony@atomide.com>
2012-06-26 03:14:20 -07:00

161 lines
4.6 KiB
C

/*
* MSDI IP block reset
*
* Copyright (C) 2012 Texas Instruments, Inc.
* Paul Walmsley
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* XXX What about pad muxing?
*/
#include <linux/kernel.h>
#include <linux/err.h>
#include <plat/omap_hwmod.h>
#include <plat/omap_device.h>
#include <plat/mmc.h>
#include "common.h"
#include "control.h"
#include "mux.h"
/*
* MSDI_CON_OFFSET: offset in bytes of the MSDI IP block's CON register
* from the IP block's base address
*/
#define MSDI_CON_OFFSET 0x0c
/* Register bitfields in the CON register */
#define MSDI_CON_POW_MASK BIT(11)
#define MSDI_CON_CLKD_MASK (0x3f << 0)
#define MSDI_CON_CLKD_SHIFT 0
/* Maximum microseconds to wait for OMAP module to softreset */
#define MAX_MODULE_SOFTRESET_WAIT 10000
/* MSDI_TARGET_RESET_CLKD: clock divisor to use throughout the reset */
#define MSDI_TARGET_RESET_CLKD 0x3ff
/**
* omap_msdi_reset - reset the MSDI IP block
* @oh: struct omap_hwmod *
*
* The MSDI IP block on OMAP2420 has to have both the POW and CLKD
* fields set inside its CON register for a reset to complete
* successfully. This is not documented in the TRM. For CLKD, we use
* the value that results in the lowest possible clock rate, to attempt
* to avoid disturbing any cards.
*/
int omap_msdi_reset(struct omap_hwmod *oh)
{
u16 v = 0;
int c = 0;
/* Write to the SOFTRESET bit */
omap_hwmod_softreset(oh);
/* Enable the MSDI core and internal clock */
v |= MSDI_CON_POW_MASK;
v |= MSDI_TARGET_RESET_CLKD << MSDI_CON_CLKD_SHIFT;
omap_hwmod_write(v, oh, MSDI_CON_OFFSET);
/* Poll on RESETDONE bit */
omap_test_timeout((omap_hwmod_read(oh, oh->class->sysc->syss_offs)
& SYSS_RESETDONE_MASK),
MAX_MODULE_SOFTRESET_WAIT, c);
if (c == MAX_MODULE_SOFTRESET_WAIT)
pr_warning("%s: %s: softreset failed (waited %d usec)\n",
__func__, oh->name, MAX_MODULE_SOFTRESET_WAIT);
else
pr_debug("%s: %s: softreset in %d usec\n", __func__,
oh->name, c);
/* Disable the MSDI internal clock */
v &= ~MSDI_CON_CLKD_MASK;
omap_hwmod_write(v, oh, MSDI_CON_OFFSET);
return 0;
}
#if defined(CONFIG_MMC_OMAP) || defined(CONFIG_MMC_OMAP_MODULE)
static inline void omap242x_mmc_mux(struct omap_mmc_platform_data
*mmc_controller)
{
if ((mmc_controller->slots[0].switch_pin > 0) && \
(mmc_controller->slots[0].switch_pin < OMAP_MAX_GPIO_LINES))
omap_mux_init_gpio(mmc_controller->slots[0].switch_pin,
OMAP_PIN_INPUT_PULLUP);
if ((mmc_controller->slots[0].gpio_wp > 0) && \
(mmc_controller->slots[0].gpio_wp < OMAP_MAX_GPIO_LINES))
omap_mux_init_gpio(mmc_controller->slots[0].gpio_wp,
OMAP_PIN_INPUT_PULLUP);
omap_mux_init_signal("sdmmc_cmd", 0);
omap_mux_init_signal("sdmmc_clki", 0);
omap_mux_init_signal("sdmmc_clko", 0);
omap_mux_init_signal("sdmmc_dat0", 0);
omap_mux_init_signal("sdmmc_dat_dir0", 0);
omap_mux_init_signal("sdmmc_cmd_dir", 0);
if (mmc_controller->slots[0].caps & MMC_CAP_4_BIT_DATA) {
omap_mux_init_signal("sdmmc_dat1", 0);
omap_mux_init_signal("sdmmc_dat2", 0);
omap_mux_init_signal("sdmmc_dat3", 0);
omap_mux_init_signal("sdmmc_dat_dir1", 0);
omap_mux_init_signal("sdmmc_dat_dir2", 0);
omap_mux_init_signal("sdmmc_dat_dir3", 0);
}
/*
* Use internal loop-back in MMC/SDIO Module Input Clock
* selection
*/
if (mmc_controller->slots[0].internal_clock) {
u32 v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
v |= (1 << 24);
omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);
}
}
void __init omap242x_init_mmc(struct omap_mmc_platform_data **mmc_data)
{
struct platform_device *pdev;
struct omap_hwmod *oh;
int id = 0;
char *oh_name = "msdi1";
char *dev_name = "mmci-omap";
if (!mmc_data[0]) {
pr_err("%s fails: Incomplete platform data\n", __func__);
return;
}
omap242x_mmc_mux(mmc_data[0]);
oh = omap_hwmod_lookup(oh_name);
if (!oh) {
pr_err("Could not look up %s\n", oh_name);
return;
}
pdev = omap_device_build(dev_name, id, oh, mmc_data[0],
sizeof(struct omap_mmc_platform_data), NULL, 0, 0);
if (IS_ERR(pdev))
WARN(1, "Can'd build omap_device for %s:%s.\n",
dev_name, oh->name);
}
#endif