tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * include/linux/mmc/sh_mmcif.h
3 *
4 * platform data for eMMC driver
5 *
6 * Copyright (C) 2010 Renesas Solutions Corp.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License.
11 *
12 */
13
14#ifndef LINUX_MMC_SH_MMCIF_H
15#define LINUX_MMC_SH_MMCIF_H
16
17#include <linux/io.h>
18#include <linux/platform_device.h>
19
20/*
21 * MMCIF : CE_CLK_CTRL [19:16]
22 * 1000 : Peripheral clock / 512
23 * 0111 : Peripheral clock / 256
24 * 0110 : Peripheral clock / 128
25 * 0101 : Peripheral clock / 64
26 * 0100 : Peripheral clock / 32
27 * 0011 : Peripheral clock / 16
28 * 0010 : Peripheral clock / 8
29 * 0001 : Peripheral clock / 4
30 * 0000 : Peripheral clock / 2
31 * 1111 : Peripheral clock (sup_pclk set '1')
32 */
33
34struct sh_mmcif_plat_data {
35 int (*get_cd)(struct platform_device *pdef);
36 unsigned int slave_id_tx; /* embedded slave_id_[tr]x */
37 unsigned int slave_id_rx;
38 bool use_cd_gpio : 1;
39 bool ccs_unsupported : 1;
40 bool clk_ctrl2_present : 1;
41 unsigned int cd_gpio;
42 u8 sup_pclk; /* 1 :SH7757, 0: SH7724/SH7372 */
43 unsigned long caps;
44 u32 ocr;
45};
46
47#define MMCIF_CE_CMD_SET 0x00000000
48#define MMCIF_CE_ARG 0x00000008
49#define MMCIF_CE_ARG_CMD12 0x0000000C
50#define MMCIF_CE_CMD_CTRL 0x00000010
51#define MMCIF_CE_BLOCK_SET 0x00000014
52#define MMCIF_CE_CLK_CTRL 0x00000018
53#define MMCIF_CE_BUF_ACC 0x0000001C
54#define MMCIF_CE_RESP3 0x00000020
55#define MMCIF_CE_RESP2 0x00000024
56#define MMCIF_CE_RESP1 0x00000028
57#define MMCIF_CE_RESP0 0x0000002C
58#define MMCIF_CE_RESP_CMD12 0x00000030
59#define MMCIF_CE_DATA 0x00000034
60#define MMCIF_CE_INT 0x00000040
61#define MMCIF_CE_INT_MASK 0x00000044
62#define MMCIF_CE_HOST_STS1 0x00000048
63#define MMCIF_CE_HOST_STS2 0x0000004C
64#define MMCIF_CE_CLK_CTRL2 0x00000070
65#define MMCIF_CE_VERSION 0x0000007C
66
67/* CE_BUF_ACC */
68#define BUF_ACC_DMAWEN (1 << 25)
69#define BUF_ACC_DMAREN (1 << 24)
70#define BUF_ACC_BUSW_32 (0 << 17)
71#define BUF_ACC_BUSW_16 (1 << 17)
72#define BUF_ACC_ATYP (1 << 16)
73
74/* CE_CLK_CTRL */
75#define CLK_ENABLE (1 << 24) /* 1: output mmc clock */
76#define CLK_CLEAR (0xf << 16)
77#define CLK_SUP_PCLK (0xf << 16)
78#define CLKDIV_4 (1 << 16) /* mmc clock frequency.
79 * n: bus clock/(2^(n+1)) */
80#define CLKDIV_256 (7 << 16) /* mmc clock frequency. (see above) */
81#define SRSPTO_256 (2 << 12) /* resp timeout */
82#define SRBSYTO_29 (0xf << 8) /* resp busy timeout */
83#define SRWDTO_29 (0xf << 4) /* read/write timeout */
84#define SCCSTO_29 (0xf << 0) /* ccs timeout */
85
86/* CE_VERSION */
87#define SOFT_RST_ON (1 << 31)
88#define SOFT_RST_OFF 0
89
90static inline u32 sh_mmcif_readl(void __iomem *addr, int reg)
91{
92 return __raw_readl(addr + reg);
93}
94
95static inline void sh_mmcif_writel(void __iomem *addr, int reg, u32 val)
96{
97 __raw_writel(val, addr + reg);
98}
99
100#define SH_MMCIF_BBS 512 /* boot block size */
101
102static inline void sh_mmcif_boot_cmd_send(void __iomem *base,
103 unsigned long cmd, unsigned long arg)
104{
105 sh_mmcif_writel(base, MMCIF_CE_INT, 0);
106 sh_mmcif_writel(base, MMCIF_CE_ARG, arg);
107 sh_mmcif_writel(base, MMCIF_CE_CMD_SET, cmd);
108}
109
110static inline int sh_mmcif_boot_cmd_poll(void __iomem *base, unsigned long mask)
111{
112 unsigned long tmp;
113 int cnt;
114
115 for (cnt = 0; cnt < 1000000; cnt++) {
116 tmp = sh_mmcif_readl(base, MMCIF_CE_INT);
117 if (tmp & mask) {
118 sh_mmcif_writel(base, MMCIF_CE_INT, tmp & ~mask);
119 return 0;
120 }
121 }
122
123 return -1;
124}
125
126static inline int sh_mmcif_boot_cmd(void __iomem *base,
127 unsigned long cmd, unsigned long arg)
128{
129 sh_mmcif_boot_cmd_send(base, cmd, arg);
130 return sh_mmcif_boot_cmd_poll(base, 0x00010000);
131}
132
133static inline int sh_mmcif_boot_do_read_single(void __iomem *base,
134 unsigned int block_nr,
135 unsigned long *buf)
136{
137 int k;
138
139 /* CMD13 - Status */
140 sh_mmcif_boot_cmd(base, 0x0d400000, 0x00010000);
141
142 if (sh_mmcif_readl(base, MMCIF_CE_RESP0) != 0x0900)
143 return -1;
144
145 /* CMD17 - Read */
146 sh_mmcif_boot_cmd(base, 0x11480000, block_nr * SH_MMCIF_BBS);
147 if (sh_mmcif_boot_cmd_poll(base, 0x00100000) < 0)
148 return -1;
149
150 for (k = 0; k < (SH_MMCIF_BBS / 4); k++)
151 buf[k] = sh_mmcif_readl(base, MMCIF_CE_DATA);
152
153 return 0;
154}
155
156static inline int sh_mmcif_boot_do_read(void __iomem *base,
157 unsigned long first_block,
158 unsigned long nr_blocks,
159 void *buf)
160{
161 unsigned long k;
162 int ret = 0;
163
164 /* In data transfer mode: Set clock to Bus clock/4 (about 20Mhz) */
165 sh_mmcif_writel(base, MMCIF_CE_CLK_CTRL,
166 CLK_ENABLE | CLKDIV_4 | SRSPTO_256 |
167 SRBSYTO_29 | SRWDTO_29 | SCCSTO_29);
168
169 /* CMD9 - Get CSD */
170 sh_mmcif_boot_cmd(base, 0x09806000, 0x00010000);
171
172 /* CMD7 - Select the card */
173 sh_mmcif_boot_cmd(base, 0x07400000, 0x00010000);
174
175 /* CMD16 - Set the block size */
176 sh_mmcif_boot_cmd(base, 0x10400000, SH_MMCIF_BBS);
177
178 for (k = 0; !ret && k < nr_blocks; k++)
179 ret = sh_mmcif_boot_do_read_single(base, first_block + k,
180 buf + (k * SH_MMCIF_BBS));
181
182 return ret;
183}
184
185static inline void sh_mmcif_boot_init(void __iomem *base)
186{
187 /* reset */
188 sh_mmcif_writel(base, MMCIF_CE_VERSION, SOFT_RST_ON);
189 sh_mmcif_writel(base, MMCIF_CE_VERSION, SOFT_RST_OFF);
190
191 /* byte swap */
192 sh_mmcif_writel(base, MMCIF_CE_BUF_ACC, BUF_ACC_ATYP);
193
194 /* Set block size in MMCIF hardware */
195 sh_mmcif_writel(base, MMCIF_CE_BLOCK_SET, SH_MMCIF_BBS);
196
197 /* Enable the clock, set it to Bus clock/256 (about 325Khz). */
198 sh_mmcif_writel(base, MMCIF_CE_CLK_CTRL,
199 CLK_ENABLE | CLKDIV_256 | SRSPTO_256 |
200 SRBSYTO_29 | SRWDTO_29 | SCCSTO_29);
201
202 /* CMD0 */
203 sh_mmcif_boot_cmd(base, 0x00000040, 0);
204
205 /* CMD1 - Get OCR */
206 do {
207 sh_mmcif_boot_cmd(base, 0x01405040, 0x40300000); /* CMD1 */
208 } while ((sh_mmcif_readl(base, MMCIF_CE_RESP0) & 0x80000000)
209 != 0x80000000);
210
211 /* CMD2 - Get CID */
212 sh_mmcif_boot_cmd(base, 0x02806040, 0);
213
214 /* CMD3 - Set card relative address */
215 sh_mmcif_boot_cmd(base, 0x03400040, 0x00010000);
216}
217
218#endif /* LINUX_MMC_SH_MMCIF_H */