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ARM: 6886/1: mmc, Add zboot from eSD support for SuperH Mobile ARM
This allows a ROM-able zImage to be written to eSD and for SuperH Mobile ARM to boot directly from the SDHI hardware block. This is achieved by the MaskROM loading the first portion of the image into MERAM and then jumping to it. This portion contains loader code which copies the entire image to SDRAM and jumps to it. From there the zImage boot code proceeds as normal, uncompressing the image into its final location and then jumping to it. Cc: Paul Mundt <lethal@linux-sh.org> Acked-by: Magnus Damm <magnus.damm@gmail.com> Acked-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Simon Horman <horms@verge.net.au> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Russell King
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Jun 29, 2011
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| ROM-able zImage boot from eSD | ||
| ----------------------------- | ||
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| An ROM-able zImage compiled with ZBOOT_ROM_SDHI may be written to eSD and | ||
| SuperH Mobile ARM will to boot directly from the SDHI hardware block. | ||
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| This is achieved by the mask ROM loading the first portion of the image into | ||
| MERAM and then jumping to it. This portion contains loader code which | ||
| copies the entire image to SDRAM and jumps to it. From there the zImage | ||
| boot code proceeds as normal, uncompressing the image into its final | ||
| location and then jumping to it. | ||
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| This code has been tested on an mackerel board using the developer 1A eSD | ||
| boot mode which is configured using the following jumper settings. | ||
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| 8 7 6 5 4 3 2 1 | ||
| x|x|x|x| |x|x| | ||
| S4 -+-+-+-+-+-+-+- | ||
| | | | |x| | |x on | ||
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| The eSD card needs to be present in SDHI slot 1 (CN7). | ||
| As such S1 and S33 also need to be configured as per | ||
| the notes in arch/arm/mach-shmobile/board-mackerel.c. | ||
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| A partial zImage must be written to physical partition #1 (boot) | ||
| of the eSD at sector 0 in vrl4 format. A utility vrl4 is supplied to | ||
| accomplish this. | ||
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| e.g. | ||
| vrl4 < zImage | dd of=/dev/sdX bs=512 count=17 | ||
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| A full copy of _the same_ zImage should be written to physical partition #1 | ||
| (boot) of the eSD at sector 0. This should _not_ be in vrl4 format. | ||
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| vrl4 < zImage | dd of=/dev/sdX bs=512 | ||
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| Note: The commands above assume that the physical partition has been | ||
| switched. No such facility currently exists in the Linux Kernel. | ||
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| Physical partitions are described in the eSD specification. At the time of | ||
| writing they are not the same as partitions that are typically configured | ||
| using fdisk and visible through /proc/partitions |
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| @@ -0,0 +1,95 @@ | ||
| /* | ||
| * SuperH Mobile SDHI | ||
| * | ||
| * Copyright (C) 2010 Magnus Damm | ||
| * Copyright (C) 2010 Kuninori Morimoto | ||
| * Copyright (C) 2010 Simon Horman | ||
| * | ||
| * 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. | ||
| * | ||
| * Parts inspired by u-boot | ||
| */ | ||
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| #include <linux/io.h> | ||
| #include <mach/mmc.h> | ||
| #include <linux/mmc/boot.h> | ||
| #include <linux/mmc/tmio.h> | ||
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| #include "sdhi-shmobile.h" | ||
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| #define PORT179CR 0xe60520b3 | ||
| #define PORT180CR 0xe60520b4 | ||
| #define PORT181CR 0xe60520b5 | ||
| #define PORT182CR 0xe60520b6 | ||
| #define PORT183CR 0xe60520b7 | ||
| #define PORT184CR 0xe60520b8 | ||
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| #define SMSTPCR3 0xe615013c | ||
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| #define CR_INPUT_ENABLE 0x10 | ||
| #define CR_FUNCTION1 0x01 | ||
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| #define SDHI1_BASE (void __iomem *)0xe6860000 | ||
| #define SDHI_BASE SDHI1_BASE | ||
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| /* SuperH Mobile SDHI loader | ||
| * | ||
| * loads the zImage from an SD card starting from block 0 | ||
| * on physical partition 1 | ||
| * | ||
| * The image must be start with a vrl4 header and | ||
| * the zImage must start at offset 512 of the image. That is, | ||
| * at block 1 (=byte 512) of physical partition 1 | ||
| * | ||
| * Use the following line to write the vrl4 formated zImage | ||
| * to an SD card | ||
| * # dd if=vrl4.out of=/dev/sdx bs=512 | ||
| */ | ||
| asmlinkage void mmc_loader(unsigned short *buf, unsigned long len) | ||
| { | ||
| int high_capacity; | ||
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| mmc_init_progress(); | ||
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| mmc_update_progress(MMC_PROGRESS_ENTER); | ||
| /* Initialise SDHI1 */ | ||
| /* PORT184CR: GPIO_FN_SDHICMD1 Control */ | ||
| __raw_writeb(CR_FUNCTION1, PORT184CR); | ||
| /* PORT179CR: GPIO_FN_SDHICLK1 Control */ | ||
| __raw_writeb(CR_INPUT_ENABLE|CR_FUNCTION1, PORT179CR); | ||
| /* PORT181CR: GPIO_FN_SDHID1_3 Control */ | ||
| __raw_writeb(CR_FUNCTION1, PORT183CR); | ||
| /* PORT182CR: GPIO_FN_SDHID1_2 Control */ | ||
| __raw_writeb(CR_FUNCTION1, PORT182CR); | ||
| /* PORT183CR: GPIO_FN_SDHID1_1 Control */ | ||
| __raw_writeb(CR_FUNCTION1, PORT181CR); | ||
| /* PORT180CR: GPIO_FN_SDHID1_0 Control */ | ||
| __raw_writeb(CR_FUNCTION1, PORT180CR); | ||
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| /* Enable clock to SDHI1 hardware block */ | ||
| __raw_writel(__raw_readl(SMSTPCR3) & ~(1 << 13), SMSTPCR3); | ||
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| /* setup SDHI hardware */ | ||
| mmc_update_progress(MMC_PROGRESS_INIT); | ||
| high_capacity = sdhi_boot_init(SDHI_BASE); | ||
| if (high_capacity < 0) | ||
| goto err; | ||
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| mmc_update_progress(MMC_PROGRESS_LOAD); | ||
| /* load kernel */ | ||
| if (sdhi_boot_do_read(SDHI_BASE, high_capacity, | ||
| 0, /* Kernel is at block 1 */ | ||
| (len + TMIO_BBS - 1) / TMIO_BBS, buf)) | ||
| goto err; | ||
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| /* Disable clock to SDHI1 hardware block */ | ||
| __raw_writel(__raw_readl(SMSTPCR3) & (1 << 13), SMSTPCR3); | ||
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| mmc_update_progress(MMC_PROGRESS_DONE); | ||
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| return; | ||
| err: | ||
| for(;;); | ||
| } |
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