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>
29 #include <plat/omap_device.h>
37 * MSDI_CON_OFFSET: offset in bytes of the MSDI IP block's CON register
38 * from the IP block's base address
40 #define MSDI_CON_OFFSET 0x0c
42 /* Register bitfields in the CON register */
43 #define MSDI_CON_POW_MASK BIT(11)
44 #define MSDI_CON_CLKD_MASK (0x3f << 0)
45 #define MSDI_CON_CLKD_SHIFT 0
47 /* Maximum microseconds to wait for OMAP module to softreset */
48 #define MAX_MODULE_SOFTRESET_WAIT 10000
50 /* MSDI_TARGET_RESET_CLKD: clock divisor to use throughout the reset */
51 #define MSDI_TARGET_RESET_CLKD 0x3ff
54 * omap_msdi_reset - reset the MSDI IP block
55 * @oh: struct omap_hwmod *
57 * The MSDI IP block on OMAP2420 has to have both the POW and CLKD
58 * fields set inside its CON register for a reset to complete
59 * successfully. This is not documented in the TRM. For CLKD, we use
60 * the value that results in the lowest possible clock rate, to attempt
61 * to avoid disturbing any cards.
63 int omap_msdi_reset(struct omap_hwmod *oh)
68 /* Write to the SOFTRESET bit */
69 omap_hwmod_softreset(oh);
71 /* Enable the MSDI core and internal clock */
72 v |= MSDI_CON_POW_MASK;
73 v |= MSDI_TARGET_RESET_CLKD << MSDI_CON_CLKD_SHIFT;
74 omap_hwmod_write(v, oh, MSDI_CON_OFFSET);
76 /* Poll on RESETDONE bit */
77 omap_test_timeout((omap_hwmod_read(oh, oh->class->sysc->syss_offs)
78 & SYSS_RESETDONE_MASK),
79 MAX_MODULE_SOFTRESET_WAIT, c);
81 if (c == MAX_MODULE_SOFTRESET_WAIT)
82 pr_warning("%s: %s: softreset failed (waited %d usec)\n",
83 __func__, oh->name, MAX_MODULE_SOFTRESET_WAIT);
85 pr_debug("%s: %s: softreset in %d usec\n", __func__,
88 /* Disable the MSDI internal clock */
89 v &= ~MSDI_CON_CLKD_MASK;
90 omap_hwmod_write(v, oh, MSDI_CON_OFFSET);
95 #if defined(CONFIG_MMC_OMAP) || defined(CONFIG_MMC_OMAP_MODULE)
97 static inline void omap242x_mmc_mux(struct omap_mmc_platform_data
100 if ((mmc_controller->slots[0].switch_pin > 0) && \
101 (mmc_controller->slots[0].switch_pin < OMAP_MAX_GPIO_LINES))
102 omap_mux_init_gpio(mmc_controller->slots[0].switch_pin,
103 OMAP_PIN_INPUT_PULLUP);
104 if ((mmc_controller->slots[0].gpio_wp > 0) && \
105 (mmc_controller->slots[0].gpio_wp < OMAP_MAX_GPIO_LINES))
106 omap_mux_init_gpio(mmc_controller->slots[0].gpio_wp,
107 OMAP_PIN_INPUT_PULLUP);
109 omap_mux_init_signal("sdmmc_cmd", 0);
110 omap_mux_init_signal("sdmmc_clki", 0);
111 omap_mux_init_signal("sdmmc_clko", 0);
112 omap_mux_init_signal("sdmmc_dat0", 0);
113 omap_mux_init_signal("sdmmc_dat_dir0", 0);
114 omap_mux_init_signal("sdmmc_cmd_dir", 0);
115 if (mmc_controller->slots[0].caps & MMC_CAP_4_BIT_DATA) {
116 omap_mux_init_signal("sdmmc_dat1", 0);
117 omap_mux_init_signal("sdmmc_dat2", 0);
118 omap_mux_init_signal("sdmmc_dat3", 0);
119 omap_mux_init_signal("sdmmc_dat_dir1", 0);
120 omap_mux_init_signal("sdmmc_dat_dir2", 0);
121 omap_mux_init_signal("sdmmc_dat_dir3", 0);
125 * Use internal loop-back in MMC/SDIO Module Input Clock
128 if (mmc_controller->slots[0].internal_clock) {
129 u32 v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
131 omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);
135 void __init omap242x_init_mmc(struct omap_mmc_platform_data **mmc_data)
137 struct platform_device *pdev;
138 struct omap_hwmod *oh;
140 char *oh_name = "msdi1";
141 char *dev_name = "mmci-omap";
144 pr_err("%s fails: Incomplete platform data\n", __func__);
148 omap242x_mmc_mux(mmc_data[0]);
150 oh = omap_hwmod_lookup(oh_name);
152 pr_err("Could not look up %s\n", oh_name);
155 pdev = omap_device_build(dev_name, id, oh, mmc_data[0],
156 sizeof(struct omap_mmc_platform_data), NULL, 0, 0);
158 WARN(1, "Can'd build omap_device for %s:%s.\n",