GIF89a;
Mini Shell
Mini Shell
/*
* include/linux/mmc/sh_mmcif.h
*
* platform data for eMMC driver
*
* Copyright (C) 2010 Renesas Solutions Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License.
*
*/
#ifndef LINUX_MMC_SH_MMCIF_H
#define LINUX_MMC_SH_MMCIF_H
#include <linux/io.h>
#include <linux/platform_device.h>
/*
* MMCIF : CE_CLK_CTRL [19:16]
* 1000 : Peripheral clock / 512
* 0111 : Peripheral clock / 256
* 0110 : Peripheral clock / 128
* 0101 : Peripheral clock / 64
* 0100 : Peripheral clock / 32
* 0011 : Peripheral clock / 16
* 0010 : Peripheral clock / 8
* 0001 : Peripheral clock / 4
* 0000 : Peripheral clock / 2
* 1111 : Peripheral clock (sup_pclk set '1')
*/
struct sh_mmcif_plat_data {
int (*get_cd)(struct platform_device *pdef);
unsigned int slave_id_tx; /* embedded slave_id_[tr]x */
unsigned int slave_id_rx;
bool use_cd_gpio : 1;
bool ccs_unsupported : 1;
bool clk_ctrl2_present : 1;
unsigned int cd_gpio;
u8 sup_pclk; /* 1 :SH7757, 0: SH7724/SH7372 */
unsigned long caps;
u32 ocr;
};
#define MMCIF_CE_CMD_SET 0x00000000
#define MMCIF_CE_ARG 0x00000008
#define MMCIF_CE_ARG_CMD12 0x0000000C
#define MMCIF_CE_CMD_CTRL 0x00000010
#define MMCIF_CE_BLOCK_SET 0x00000014
#define MMCIF_CE_CLK_CTRL 0x00000018
#define MMCIF_CE_BUF_ACC 0x0000001C
#define MMCIF_CE_RESP3 0x00000020
#define MMCIF_CE_RESP2 0x00000024
#define MMCIF_CE_RESP1 0x00000028
#define MMCIF_CE_RESP0 0x0000002C
#define MMCIF_CE_RESP_CMD12 0x00000030
#define MMCIF_CE_DATA 0x00000034
#define MMCIF_CE_INT 0x00000040
#define MMCIF_CE_INT_MASK 0x00000044
#define MMCIF_CE_HOST_STS1 0x00000048
#define MMCIF_CE_HOST_STS2 0x0000004C
#define MMCIF_CE_CLK_CTRL2 0x00000070
#define MMCIF_CE_VERSION 0x0000007C
/* CE_BUF_ACC */
#define BUF_ACC_DMAWEN (1 << 25)
#define BUF_ACC_DMAREN (1 << 24)
#define BUF_ACC_BUSW_32 (0 << 17)
#define BUF_ACC_BUSW_16 (1 << 17)
#define BUF_ACC_ATYP (1 << 16)
/* CE_CLK_CTRL */
#define CLK_ENABLE (1 << 24) /* 1: output mmc clock */
#define CLK_CLEAR (0xf << 16)
#define CLK_SUP_PCLK (0xf << 16)
#define CLKDIV_4 (1 << 16) /* mmc clock frequency.
* n: bus clock/(2^(n+1)) */
#define CLKDIV_256 (7 << 16) /* mmc clock frequency. (see above) */
#define SRSPTO_256 (2 << 12) /* resp timeout */
#define SRBSYTO_29 (0xf << 8) /* resp busy timeout */
#define SRWDTO_29 (0xf << 4) /* read/write timeout */
#define SCCSTO_29 (0xf << 0) /* ccs timeout */
/* CE_VERSION */
#define SOFT_RST_ON (1 << 31)
#define SOFT_RST_OFF 0
static inline u32 sh_mmcif_readl(void __iomem *addr, int reg)
{
return __raw_readl(addr + reg);
}
static inline void sh_mmcif_writel(void __iomem *addr, int reg, u32 val)
{
__raw_writel(val, addr + reg);
}
#define SH_MMCIF_BBS 512 /* boot block size */
static inline void sh_mmcif_boot_cmd_send(void __iomem *base,
unsigned long cmd, unsigned long arg)
{
sh_mmcif_writel(base, MMCIF_CE_INT, 0);
sh_mmcif_writel(base, MMCIF_CE_ARG, arg);
sh_mmcif_writel(base, MMCIF_CE_CMD_SET, cmd);
}
static inline int sh_mmcif_boot_cmd_poll(void __iomem *base, unsigned long mask)
{
unsigned long tmp;
int cnt;
for (cnt = 0; cnt < 1000000; cnt++) {
tmp = sh_mmcif_readl(base, MMCIF_CE_INT);
if (tmp & mask) {
sh_mmcif_writel(base, MMCIF_CE_INT, tmp & ~mask);
return 0;
}
}
return -1;
}
static inline int sh_mmcif_boot_cmd(void __iomem *base,
unsigned long cmd, unsigned long arg)
{
sh_mmcif_boot_cmd_send(base, cmd, arg);
return sh_mmcif_boot_cmd_poll(base, 0x00010000);
}
static inline int sh_mmcif_boot_do_read_single(void __iomem *base,
unsigned int block_nr,
unsigned long *buf)
{
int k;
/* CMD13 - Status */
sh_mmcif_boot_cmd(base, 0x0d400000, 0x00010000);
if (sh_mmcif_readl(base, MMCIF_CE_RESP0) != 0x0900)
return -1;
/* CMD17 - Read */
sh_mmcif_boot_cmd(base, 0x11480000, block_nr * SH_MMCIF_BBS);
if (sh_mmcif_boot_cmd_poll(base, 0x00100000) < 0)
return -1;
for (k = 0; k < (SH_MMCIF_BBS / 4); k++)
buf[k] = sh_mmcif_readl(base, MMCIF_CE_DATA);
return 0;
}
static inline int sh_mmcif_boot_do_read(void __iomem *base,
unsigned long first_block,
unsigned long nr_blocks,
void *buf)
{
unsigned long k;
int ret = 0;
/* In data transfer mode: Set clock to Bus clock/4 (about 20Mhz) */
sh_mmcif_writel(base, MMCIF_CE_CLK_CTRL,
CLK_ENABLE | CLKDIV_4 | SRSPTO_256 |
SRBSYTO_29 | SRWDTO_29 | SCCSTO_29);
/* CMD9 - Get CSD */
sh_mmcif_boot_cmd(base, 0x09806000, 0x00010000);
/* CMD7 - Select the card */
sh_mmcif_boot_cmd(base, 0x07400000, 0x00010000);
/* CMD16 - Set the block size */
sh_mmcif_boot_cmd(base, 0x10400000, SH_MMCIF_BBS);
for (k = 0; !ret && k < nr_blocks; k++)
ret = sh_mmcif_boot_do_read_single(base, first_block + k,
buf + (k * SH_MMCIF_BBS));
return ret;
}
static inline void sh_mmcif_boot_init(void __iomem *base)
{
/* reset */
sh_mmcif_writel(base, MMCIF_CE_VERSION, SOFT_RST_ON);
sh_mmcif_writel(base, MMCIF_CE_VERSION, SOFT_RST_OFF);
/* byte swap */
sh_mmcif_writel(base, MMCIF_CE_BUF_ACC, BUF_ACC_ATYP);
/* Set block size in MMCIF hardware */
sh_mmcif_writel(base, MMCIF_CE_BLOCK_SET, SH_MMCIF_BBS);
/* Enable the clock, set it to Bus clock/256 (about 325Khz). */
sh_mmcif_writel(base, MMCIF_CE_CLK_CTRL,
CLK_ENABLE | CLKDIV_256 | SRSPTO_256 |
SRBSYTO_29 | SRWDTO_29 | SCCSTO_29);
/* CMD0 */
sh_mmcif_boot_cmd(base, 0x00000040, 0);
/* CMD1 - Get OCR */
do {
sh_mmcif_boot_cmd(base, 0x01405040, 0x40300000); /* CMD1 */
} while ((sh_mmcif_readl(base, MMCIF_CE_RESP0) & 0x80000000)
!= 0x80000000);
/* CMD2 - Get CID */
sh_mmcif_boot_cmd(base, 0x02806040, 0);
/* CMD3 - Set card relative address */
sh_mmcif_boot_cmd(base, 0x03400040, 0x00010000);
}
#endif /* LINUX_MMC_SH_MMCIF_H */
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