ad1b6662eb
Add MMC for 2420 so we can pass the DMA request lines the same way as we already do on omap2430 and later. Cc: Benoit Cousson <b-cousson@ti.com> Cc: Paul Walmsley <paul@pwsan.com> Signed-off-by: Tony Lindgren <tony@atomide.com> [paul@pwsan.com: updated to apply on top of the 3.5 hwmod cleanup; changed mmc hwmod name/class to "msdi" as documented in the 2420 TRM Rev X; added sysconfig register information; added 16 bit register width flag; added MSDI custom reset code] Signed-off-by: Paul Walmsley <paul@pwsan.com>
88 lines
2.6 KiB
C
88 lines
2.6 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 <plat/omap_hwmod.h>
|
|
#include <plat/mmc.h>
|
|
|
|
#include "common.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;
|
|
}
|