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sh: add boot code to MMCIF driver header 

This patch adds a set of MMCIF functions for the romImage
boot loader that allows the kernel to be booted directly
from an MMC card.

Thanks to Jeremy Baker for the initial prototype.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2010-05-18 14:43:04 +00:00 committed by Paul Mundt
parent 487d9fc501
commit 8a768952ca
1 changed files with 129 additions and 0 deletions
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129
include/linux/mmc/sh_mmcif.h
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@ -68,4 +68,133 @@ extern inline void sh_mmcif_writel(void __iomem *addr, int reg, u32 val)
writel(val, addr + reg);
}
#define SH_MMCIF_BBS 512 /* boot block size */
extern 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);
}
extern 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;
}
extern 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);
}
extern 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;
}
extern 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;
/* 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;
}
extern inline void sh_mmcif_boot_init(void __iomem *base)
{
unsigned long tmp;
/* reset */
tmp = sh_mmcif_readl(base, MMCIF_CE_VERSION);
sh_mmcif_writel(base, MMCIF_CE_VERSION, tmp | 0x80000000);
sh_mmcif_writel(base, MMCIF_CE_VERSION, tmp & ~0x80000000);
/* byte swap */
sh_mmcif_writel(base, MMCIF_CE_BUF_ACC, 0x00010000);
/* 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, 0x01072fff);
/* 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);
}
extern inline void sh_mmcif_boot_slurp(void __iomem *base,
unsigned char *buf,
unsigned long no_bytes)
{
unsigned long tmp;
/* In data transfer mode: Set clock to Bus clock/4 (about 20Mhz) */
sh_mmcif_writel(base, MMCIF_CE_CLK_CTRL, 0x01012fff);
/* CMD9 - Get CSD */
sh_mmcif_boot_cmd(base, 0x09806000, 0x00010000);
/* CMD7 - Select the card */
sh_mmcif_boot_cmd(base, 0x07400000, 0x00010000);
tmp = no_bytes / SH_MMCIF_BBS;
tmp += (no_bytes % SH_MMCIF_BBS) ? 1 : 0;
sh_mmcif_boot_do_read(base, 512, tmp, buf);
}
#endif /* __SH_MMCIF_H__ */