Commit | Line | Data |
---|---|---|
ad1b6662 TL |
1 | /* |
2 | * MSDI IP block reset | |
3 | * | |
4 | * Copyright (C) 2012 Texas Instruments, Inc. | |
5 | * Paul Walmsley | |
6 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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 | |
19 | * 02110-1301 USA | |
20 | * | |
21 | * XXX What about pad muxing? | |
22 | */ | |
23 | ||
24 | #include <linux/kernel.h> | |
b955eefc | 25 | #include <linux/err.h> |
4b25408f | 26 | #include <linux/platform_data/gpio-omap.h> |
ad1b6662 TL |
27 | |
28 | #include <plat/omap_hwmod.h> | |
b955eefc | 29 | #include <plat/omap_device.h> |
ad1b6662 TL |
30 | #include <plat/mmc.h> |
31 | ||
32 | #include "common.h" | |
b955eefc TL |
33 | #include "control.h" |
34 | #include "mux.h" | |
ad1b6662 TL |
35 | |
36 | /* | |
37 | * MSDI_CON_OFFSET: offset in bytes of the MSDI IP block's CON register | |
38 | * from the IP block's base address | |
39 | */ | |
40 | #define MSDI_CON_OFFSET 0x0c | |
41 | ||
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 | |
46 | ||
47 | /* Maximum microseconds to wait for OMAP module to softreset */ | |
48 | #define MAX_MODULE_SOFTRESET_WAIT 10000 | |
49 | ||
50 | /* MSDI_TARGET_RESET_CLKD: clock divisor to use throughout the reset */ | |
51 | #define MSDI_TARGET_RESET_CLKD 0x3ff | |
52 | ||
53 | /** | |
54 | * omap_msdi_reset - reset the MSDI IP block | |
55 | * @oh: struct omap_hwmod * | |
56 | * | |
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. | |
62 | */ | |
63 | int omap_msdi_reset(struct omap_hwmod *oh) | |
64 | { | |
65 | u16 v = 0; | |
66 | int c = 0; | |
67 | ||
68 | /* Write to the SOFTRESET bit */ | |
69 | omap_hwmod_softreset(oh); | |
70 | ||
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); | |
75 | ||
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); | |
80 | ||
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); | |
84 | else | |
85 | pr_debug("%s: %s: softreset in %d usec\n", __func__, | |
86 | oh->name, c); | |
87 | ||
88 | /* Disable the MSDI internal clock */ | |
89 | v &= ~MSDI_CON_CLKD_MASK; | |
90 | omap_hwmod_write(v, oh, MSDI_CON_OFFSET); | |
91 | ||
92 | return 0; | |
93 | } | |
b955eefc TL |
94 | |
95 | #if defined(CONFIG_MMC_OMAP) || defined(CONFIG_MMC_OMAP_MODULE) | |
96 | ||
97 | static inline void omap242x_mmc_mux(struct omap_mmc_platform_data | |
98 | *mmc_controller) | |
99 | { | |
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); | |
108 | ||
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); | |
122 | } | |
123 | ||
124 | /* | |
125 | * Use internal loop-back in MMC/SDIO Module Input Clock | |
126 | * selection | |
127 | */ | |
128 | if (mmc_controller->slots[0].internal_clock) { | |
129 | u32 v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0); | |
130 | v |= (1 << 24); | |
131 | omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0); | |
132 | } | |
133 | } | |
134 | ||
135 | void __init omap242x_init_mmc(struct omap_mmc_platform_data **mmc_data) | |
136 | { | |
137 | struct platform_device *pdev; | |
138 | struct omap_hwmod *oh; | |
139 | int id = 0; | |
140 | char *oh_name = "msdi1"; | |
141 | char *dev_name = "mmci-omap"; | |
142 | ||
143 | if (!mmc_data[0]) { | |
144 | pr_err("%s fails: Incomplete platform data\n", __func__); | |
145 | return; | |
146 | } | |
147 | ||
148 | omap242x_mmc_mux(mmc_data[0]); | |
149 | ||
150 | oh = omap_hwmod_lookup(oh_name); | |
151 | if (!oh) { | |
152 | pr_err("Could not look up %s\n", oh_name); | |
153 | return; | |
154 | } | |
155 | pdev = omap_device_build(dev_name, id, oh, mmc_data[0], | |
156 | sizeof(struct omap_mmc_platform_data), NULL, 0, 0); | |
157 | if (IS_ERR(pdev)) | |
158 | WARN(1, "Can'd build omap_device for %s:%s.\n", | |
159 | dev_name, oh->name); | |
160 | } | |
161 | ||
162 | #endif |