diff options
Diffstat (limited to 'kernel/arch/sh/boot/romimage')
| -rw-r--r-- | kernel/arch/sh/boot/romimage/Makefile | 30 | ||||
| -rw-r--r-- | kernel/arch/sh/boot/romimage/head.S | 84 | ||||
| -rw-r--r-- | kernel/arch/sh/boot/romimage/mmcif-sh7724.c | 72 |
3 files changed, 186 insertions, 0 deletions
diff --git a/kernel/arch/sh/boot/romimage/Makefile b/kernel/arch/sh/boot/romimage/Makefile new file mode 100644 index 000000000..2216ee57f --- /dev/null +++ b/kernel/arch/sh/boot/romimage/Makefile @@ -0,0 +1,30 @@ +# +# linux/arch/sh/boot/romimage/Makefile +# +# create an romImage file suitable for burning to flash/mmc from zImage +# + +targets := vmlinux head.o zeropage.bin piggy.o +load-y := 0 + +mmcif-load-$(CONFIG_CPU_SUBTYPE_SH7724) := 0xe5200000 # ILRAM +mmcif-obj-$(CONFIG_CPU_SUBTYPE_SH7724) := $(obj)/mmcif-sh7724.o +load-$(CONFIG_ROMIMAGE_MMCIF) := $(mmcif-load-y) +obj-$(CONFIG_ROMIMAGE_MMCIF) := $(mmcif-obj-y) + +LDFLAGS_vmlinux := --oformat $(ld-bfd) -Ttext $(load-y) -e romstart \ + -T $(obj)/../../kernel/vmlinux.lds + +$(obj)/vmlinux: $(obj)/head.o $(obj-y) $(obj)/piggy.o FORCE + $(call if_changed,ld) + @: + +OBJCOPYFLAGS += -j .empty_zero_page + +$(obj)/zeropage.bin: vmlinux FORCE + $(call if_changed,objcopy) + +LDFLAGS_piggy.o := -r --format binary --oformat $(ld-bfd) -T + +$(obj)/piggy.o: $(obj)/vmlinux.scr $(obj)/zeropage.bin arch/sh/boot/zImage FORCE + $(call if_changed,ld) diff --git a/kernel/arch/sh/boot/romimage/head.S b/kernel/arch/sh/boot/romimage/head.S new file mode 100644 index 000000000..4671d1b82 --- /dev/null +++ b/kernel/arch/sh/boot/romimage/head.S @@ -0,0 +1,84 @@ +/* + * linux/arch/sh/boot/romimage/head.S + * + * Board specific setup code, executed before zImage loader + */ + +.text + #include <asm/page.h> + + .global romstart +romstart: + /* include board specific setup code */ +#include <mach/romimage.h> + +#ifdef CONFIG_ROMIMAGE_MMCIF + /* load the romImage to above the empty zero page */ + mov.l empty_zero_page_dst, r4 + mov.l empty_zero_page_dst_adj, r5 + add r5, r4 + mov.l bytes_to_load, r5 + mov.l loader_function, r7 + jsr @r7 + mov r4, r15 + + mov.l empty_zero_page_dst, r4 + mov.l empty_zero_page_dst_adj, r5 + add r5, r4 + mov.l loaded_code_offs, r5 + add r5, r4 + jmp @r4 + nop + + .balign 4 +empty_zero_page_dst_adj: + .long PAGE_SIZE +bytes_to_load: + .long end_data - romstart +loader_function: + .long mmcif_loader +loaded_code_offs: + .long loaded_code - romstart +loaded_code: +#endif /* CONFIG_ROMIMAGE_MMCIF */ + + /* copy the empty_zero_page contents to where vmlinux expects it */ + mova extra_data_pos, r0 + mov.l extra_data_size, r1 + add r1, r0 + mov.l empty_zero_page_dst, r1 + mov #(PAGE_SHIFT - 4), r4 + mov #1, r3 + shld r4, r3 /* r3 = PAGE_SIZE / 16 */ + +1: + mov.l @r0, r4 + mov.l @(4, r0), r5 + mov.l @(8, r0), r6 + mov.l @(12, r0), r7 + add #16,r0 + mov.l r4, @r1 + mov.l r5, @(4, r1) + mov.l r6, @(8, r1) + mov.l r7, @(12, r1) + dt r3 + add #16,r1 + bf 1b + + /* jump to the zImage entry point located after the zero page data */ + mov #PAGE_SHIFT, r4 + mov #1, r1 + shld r4, r1 + mova extra_data_pos, r0 + add r1, r0 + mov.l extra_data_size, r1 + add r1, r0 + jmp @r0 + nop + + .align 2 +empty_zero_page_dst: + .long _text +extra_data_pos: +extra_data_size: + .long zero_page_pos - extra_data_pos diff --git a/kernel/arch/sh/boot/romimage/mmcif-sh7724.c b/kernel/arch/sh/boot/romimage/mmcif-sh7724.c new file mode 100644 index 000000000..16b122510 --- /dev/null +++ b/kernel/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 <linux/mmc/boot.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 + +/* 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(MMC_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(MMC_PROGRESS_INIT); + + /* setup MMCIF hardware */ + sh_mmcif_boot_init(MMCIF_BASE); + + mmcif_update_progress(MMC_PROGRESS_LOAD); + + /* load kernel via MMCIF interface */ + sh_mmcif_boot_do_read(MMCIF_BASE, 512, + (no_bytes + SH_MMCIF_BBS - 1) / SH_MMCIF_BBS, + buf); + + /* disable clock to the MMCIF hardware block */ + __raw_writel(__raw_readl(MSTPCR2) | 0x20000000, MSTPCR2); + + mmcif_update_progress(MMC_PROGRESS_DONE); +} |