Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6

[pandora-kernel.git] / arch / sh / boot / romimage / mmcif-sh7724.c

diff --git a/arch/sh/boot/romimage/mmcif-sh7724.c b/arch/sh/boot/romimage/mmcif-sh7724.c
new file mode 100644 (file)
index 0000000..14863d7
--- /dev/null
+++ b/arch/sh/boot/romimage/mmcif-sh7724.c
@@ -0,0 +1,72 @@
+/*
+ * sh7724 MMCIF loader
+ *
+ * Copyright (C) 2010 Magnus Damm
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/mmc/sh_mmcif.h>
+#include <mach/romimage.h>
+
+#define MMCIF_BASE      (void __iomem *)0xa4ca0000
+
+#define MSTPCR2                0xa4150038
+#define PTWCR          0xa4050146
+#define PTXCR          0xa4050148
+#define PSELA          0xa405014e
+#define PSELE          0xa4050156
+#define HIZCRC         0xa405015c
+#define DRVCRA         0xa405018a
+
+enum { MMCIF_PROGRESS_ENTER, MMCIF_PROGRESS_INIT,
+       MMCIF_PROGRESS_LOAD, MMCIF_PROGRESS_DONE };
+
+/* SH7724 specific MMCIF loader
+ *
+ * loads the romImage from an MMC card starting from block 512
+ * use the following line to write the romImage to an MMC card
+ * # dd if=arch/sh/boot/romImage of=/dev/sdx bs=512 seek=512
+ */
+asmlinkage void mmcif_loader(unsigned char *buf, unsigned long no_bytes)
+{
+       mmcif_update_progress(MMCIF_PROGRESS_ENTER);
+
+       /* enable clock to the MMCIF hardware block */
+       __raw_writel(__raw_readl(MSTPCR2) & ~0x20000000, MSTPCR2);
+
+       /* setup pins D7-D0 */
+       __raw_writew(0x0000, PTWCR);
+
+       /* setup pins MMC_CLK, MMC_CMD */
+       __raw_writew(__raw_readw(PTXCR) & ~0x000f, PTXCR);
+
+       /* select D3-D0 pin function */
+       __raw_writew(__raw_readw(PSELA) & ~0x2000, PSELA);
+
+       /* select D7-D4 pin function */
+       __raw_writew(__raw_readw(PSELE) & ~0x3000, PSELE);
+
+       /* disable Hi-Z for the MMC pins */
+       __raw_writew(__raw_readw(HIZCRC) & ~0x0620, HIZCRC);
+
+       /* high drive capability for MMC pins */
+       __raw_writew(__raw_readw(DRVCRA) | 0x3000, DRVCRA);
+
+       mmcif_update_progress(MMCIF_PROGRESS_INIT);
+
+       /* setup MMCIF hardware */
+       sh_mmcif_boot_init(MMCIF_BASE);
+
+       mmcif_update_progress(MMCIF_PROGRESS_LOAD);
+
+       /* load kernel via MMCIF interface */
+       sh_mmcif_boot_slurp(MMCIF_BASE, buf, no_bytes);
+
+       /* disable clock to the MMCIF hardware block */
+       __raw_writel(__raw_readl(MSTPCR2) | 0x20000000, MSTPCR2);
+
+       mmcif_update_progress(MMCIF_PROGRESS_DONE);
+}