4 * Copyright (C) 2012 Texas Instruments, Inc.
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
21 * XXX What about pad muxing?
24 #include <linux/kernel.h>
25 #include <linux/err.h>
26 #include <linux/platform_data/gpio-omap.h>
28 #include <plat/omap_hwmod.h>
31 #include "omap_device.h"
36 * MSDI_CON_OFFSET: offset in bytes of the MSDI IP block's CON register
37 * from the IP block's base address
39 #define MSDI_CON_OFFSET 0x0c
41 /* Register bitfields in the CON register */
42 #define MSDI_CON_POW_MASK BIT(11)
43 #define MSDI_CON_CLKD_MASK (0x3f << 0)
44 #define MSDI_CON_CLKD_SHIFT 0
46 /* Maximum microseconds to wait for OMAP module to softreset */
47 #define MAX_MODULE_SOFTRESET_WAIT 10000
49 /* MSDI_TARGET_RESET_CLKD: clock divisor to use throughout the reset */
50 #define MSDI_TARGET_RESET_CLKD 0x3ff
53 * omap_msdi_reset - reset the MSDI IP block
54 * @oh: struct omap_hwmod *
56 * The MSDI IP block on OMAP2420 has to have both the POW and CLKD
57 * fields set inside its CON register for a reset to complete
58 * successfully. This is not documented in the TRM. For CLKD, we use
59 * the value that results in the lowest possible clock rate, to attempt
60 * to avoid disturbing any cards.
62 int omap_msdi_reset(struct omap_hwmod
*oh
)
67 /* Write to the SOFTRESET bit */
68 omap_hwmod_softreset(oh
);
70 /* Enable the MSDI core and internal clock */
71 v
|= MSDI_CON_POW_MASK
;
72 v
|= MSDI_TARGET_RESET_CLKD
<< MSDI_CON_CLKD_SHIFT
;
73 omap_hwmod_write(v
, oh
, MSDI_CON_OFFSET
);
75 /* Poll on RESETDONE bit */
76 omap_test_timeout((omap_hwmod_read(oh
, oh
->class->sysc
->syss_offs
)
77 & SYSS_RESETDONE_MASK
),
78 MAX_MODULE_SOFTRESET_WAIT
, c
);
80 if (c
== MAX_MODULE_SOFTRESET_WAIT
)
81 pr_warning("%s: %s: softreset failed (waited %d usec)\n",
82 __func__
, oh
->name
, MAX_MODULE_SOFTRESET_WAIT
);
84 pr_debug("%s: %s: softreset in %d usec\n", __func__
,
87 /* Disable the MSDI internal clock */
88 v
&= ~MSDI_CON_CLKD_MASK
;
89 omap_hwmod_write(v
, oh
, MSDI_CON_OFFSET
);
94 #if defined(CONFIG_MMC_OMAP) || defined(CONFIG_MMC_OMAP_MODULE)
96 static inline void omap242x_mmc_mux(struct omap_mmc_platform_data
99 if ((mmc_controller
->slots
[0].switch_pin
> 0) && \
100 (mmc_controller
->slots
[0].switch_pin
< OMAP_MAX_GPIO_LINES
))
101 omap_mux_init_gpio(mmc_controller
->slots
[0].switch_pin
,
102 OMAP_PIN_INPUT_PULLUP
);
103 if ((mmc_controller
->slots
[0].gpio_wp
> 0) && \
104 (mmc_controller
->slots
[0].gpio_wp
< OMAP_MAX_GPIO_LINES
))
105 omap_mux_init_gpio(mmc_controller
->slots
[0].gpio_wp
,
106 OMAP_PIN_INPUT_PULLUP
);
108 omap_mux_init_signal("sdmmc_cmd", 0);
109 omap_mux_init_signal("sdmmc_clki", 0);
110 omap_mux_init_signal("sdmmc_clko", 0);
111 omap_mux_init_signal("sdmmc_dat0", 0);
112 omap_mux_init_signal("sdmmc_dat_dir0", 0);
113 omap_mux_init_signal("sdmmc_cmd_dir", 0);
114 if (mmc_controller
->slots
[0].caps
& MMC_CAP_4_BIT_DATA
) {
115 omap_mux_init_signal("sdmmc_dat1", 0);
116 omap_mux_init_signal("sdmmc_dat2", 0);
117 omap_mux_init_signal("sdmmc_dat3", 0);
118 omap_mux_init_signal("sdmmc_dat_dir1", 0);
119 omap_mux_init_signal("sdmmc_dat_dir2", 0);
120 omap_mux_init_signal("sdmmc_dat_dir3", 0);
124 * Use internal loop-back in MMC/SDIO Module Input Clock
127 if (mmc_controller
->slots
[0].internal_clock
) {
128 u32 v
= omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0
);
130 omap_ctrl_writel(v
, OMAP2_CONTROL_DEVCONF0
);
134 void __init
omap242x_init_mmc(struct omap_mmc_platform_data
**mmc_data
)
136 struct platform_device
*pdev
;
137 struct omap_hwmod
*oh
;
139 char *oh_name
= "msdi1";
140 char *dev_name
= "mmci-omap";
143 pr_err("%s fails: Incomplete platform data\n", __func__
);
147 omap242x_mmc_mux(mmc_data
[0]);
149 oh
= omap_hwmod_lookup(oh_name
);
151 pr_err("Could not look up %s\n", oh_name
);
154 pdev
= omap_device_build(dev_name
, id
, oh
, mmc_data
[0],
155 sizeof(struct omap_mmc_platform_data
), NULL
, 0, 0);
157 WARN(1, "Can'd build omap_device for %s:%s.\n",