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authorMagnus Damm <damm@opensource.se>2010-05-18 14:43:04 +0000
committerPaul Mundt <lethal@linux-sh.org>2010-05-31 13:11:47 +0900
commit8a768952ca8cb5cad98cfa343e6fb131e3bbdc3e (patch)
tree4e79a49469e6035946aa76d0168cd8c234768283 /include/linux/mmc
parent487d9fc5016529d7d77dfe35b666fd3a090e2953 (diff)
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>
Diffstat (limited to 'include/linux/mmc')
-rw-r--r--include/linux/mmc/sh_mmcif.h129
1 files changed, 129 insertions, 0 deletions
diff --git a/include/linux/mmc/sh_mmcif.h b/include/linux/mmc/sh_mmcif.h
index e079c6beeb9..d4a2ebbdab4 100644
--- a/include/linux/mmc/sh_mmcif.h
+++ b/include/linux/mmc/sh_mmcif.h
@@ -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__ */