Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/arm/boot/compressed/mmcif-sh7372.c
10819 views
1
/*

2
 * sh7372 MMCIF loader

3
 *

4
 * Copyright (C) 2010 Magnus Damm

5
 * Copyright (C) 2010 Simon Horman

6
 *

7
 * This file is subject to the terms and conditions of the GNU General Public

8
 * License.  See the file "COPYING" in the main directory of this archive

9
 * for more details.

10
 */

11


12
#include <linux/mmc/sh_mmcif.h>

13
#include <linux/mmc/boot.h>

14
#include <mach/mmc.h>

15


16
#define MMCIF_BASE      (void __iomem *)0xe6bd0000

17


18
#define PORT84CR	(void __iomem *)0xe6050054

19
#define PORT85CR	(void __iomem *)0xe6050055

20
#define PORT86CR	(void __iomem *)0xe6050056

21
#define PORT87CR	(void __iomem *)0xe6050057

22
#define PORT88CR	(void __iomem *)0xe6050058

23
#define PORT89CR	(void __iomem *)0xe6050059

24
#define PORT90CR	(void __iomem *)0xe605005a

25
#define PORT91CR	(void __iomem *)0xe605005b

26
#define PORT92CR	(void __iomem *)0xe605005c

27
#define PORT99CR	(void __iomem *)0xe6050063

28


29
#define SMSTPCR3	(void __iomem *)0xe615013c

30


31
/* SH7372 specific MMCIF loader

32
 *

33
 * loads the zImage from an MMC card starting from block 1.

34
 *

35
 * The image must be start with a vrl4 header and

36
 * the zImage must start at offset 512 of the image. That is,

37
 * at block 2 (=byte 1024) on the media

38
 *

39
 * Use the following line to write the vrl4 formated zImage

40
 * to an MMC card

41
 * # dd if=vrl4.out of=/dev/sdx bs=512 seek=1

42
 */

43
asmlinkage void mmcif_loader(unsigned char *buf, unsigned long len)

44
{

45
	mmc_init_progress();

46
	mmc_update_progress(MMC_PROGRESS_ENTER);

47


48
	/* Initialise MMC

49
	 * registers: PORT84CR-PORT92CR

50
	 *            (MMCD0_0-MMCD0_7,MMCCMD0 Control)

51
	 * value: 0x04 - select function 4

52
	 */

53
	 __raw_writeb(0x04, PORT84CR);

54
	 __raw_writeb(0x04, PORT85CR);

55
	 __raw_writeb(0x04, PORT86CR);

56
	 __raw_writeb(0x04, PORT87CR);

57
	 __raw_writeb(0x04, PORT88CR);

58
	 __raw_writeb(0x04, PORT89CR);

59
	 __raw_writeb(0x04, PORT90CR);

60
	 __raw_writeb(0x04, PORT91CR);

61
	 __raw_writeb(0x04, PORT92CR);

62


63
	/* Initialise MMC

64
	 * registers: PORT99CR (MMCCLK0 Control)

65
	 * value: 0x10 | 0x04 - enable output | select function 4

66
	 */

67
	__raw_writeb(0x14, PORT99CR);

68


69
	/* Enable clock to MMC hardware block */

70
	__raw_writel(__raw_readl(SMSTPCR3) & ~(1 << 12), SMSTPCR3);

71


72
	mmc_update_progress(MMC_PROGRESS_INIT);

73


74
	/* setup MMCIF hardware */

75
	sh_mmcif_boot_init(MMCIF_BASE);

76


77
	mmc_update_progress(MMC_PROGRESS_LOAD);

78


79
	/* load kernel via MMCIF interface */

80
	sh_mmcif_boot_do_read(MMCIF_BASE, 2, /* Kernel is at block 2 */

81
			      (len + SH_MMCIF_BBS - 1) / SH_MMCIF_BBS, buf);

82


83


84
	/* Disable clock to MMC hardware block */

85
	__raw_writel(__raw_readl(SMSTPCR3) & (1 << 12), SMSTPCR3);

86


87
	mmc_update_progress(MMC_PROGRESS_DONE);

88
}

89


90