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