From 61a8bd27fb5ff27db98e96b462957994e7cca946 Mon Sep 17 00:00:00 2001 From: Carl-Daniel Hailfinger Date: Thu, 5 Mar 2009 19:24:22 +0000 Subject: Use helper functions to access flash chips Right now we perform direct pointer manipulation without any abstraction to read from and write to memory mapped flash chips. That makes it impossible to drive any flasher which does not mmap the whole chip. Using helper functions readb() and writeb() allows a driver for external flash programmers like Paraflasher to replace readb and writeb with calls to its own chip access routines. This patch has the additional advantage of removing lots of unnecessary casts to volatile uint8_t * and now-superfluous parentheses which caused poor readability. I used the semantic patcher Coccinelle to create this patch. The semantic patch follows: @@ expression a; typedef uint8_t; volatile uint8_t *b; @@ - *(b) = (a); + writeb(a, b); @@ volatile uint8_t *b; @@ - *(b) + readb(b) @@ type T; T b; @@ ( readb | writeb ) (..., - (T) - (b) + b ) In contrast to a sed script, the semantic patch performs type checking before converting anything. Tested-by: Joe Julian Corresponding to flashrom svn r418 and coreboot v2 svn r3971. Signed-off-by: Carl-Daniel Hailfinger Acked-by: FENG Yu Ning --- m29f400bt.c | 56 ++++++++++++++++++++++++++++---------------------------- 1 file changed, 28 insertions(+), 28 deletions(-) (limited to 'm29f400bt.c') diff --git a/m29f400bt.c b/m29f400bt.c index d0b040d..2ca72e4 100644 --- a/m29f400bt.c +++ b/m29f400bt.c @@ -22,9 +22,9 @@ void protect_m29f400bt(volatile uint8_t *bios) { - *(volatile uint8_t *)(bios + 0xAAA) = 0xAA; - *(volatile uint8_t *)(bios + 0x555) = 0x55; - *(volatile uint8_t *)(bios + 0xAAA) = 0xA0; + writeb(0xAA, bios + 0xAAA); + writeb(0x55, bios + 0x555); + writeb(0xA0, bios + 0xAAA); usleep(200); } @@ -35,18 +35,18 @@ void write_page_m29f400bt(volatile uint8_t *bios, uint8_t *src, int i; for (i = 0; i < page_size; i++) { - *(volatile uint8_t *)(bios + 0xAAA) = 0xAA; - *(volatile uint8_t *)(bios + 0x555) = 0x55; - *(volatile uint8_t *)(bios + 0xAAA) = 0xA0; + writeb(0xAA, bios + 0xAAA); + writeb(0x55, bios + 0x555); + writeb(0xA0, bios + 0xAAA); /* transfer data from source to destination */ - *dst = *src; + writeb(*src, dst); //*(volatile char *) (bios) = 0xF0; //usleep(5); toggle_ready_jedec(dst); printf ("Value in the flash at address %p = %#x, want %#x\n", - (uint8_t *) (dst - bios), *dst, *src); + (uint8_t *) (dst - bios), readb(dst), *src); dst++; src++; } @@ -57,21 +57,21 @@ int probe_m29f400bt(struct flashchip *flash) volatile uint8_t *bios = flash->virtual_memory; uint8_t id1, id2; - *(volatile uint8_t *)(bios + 0xAAA) = 0xAA; - *(volatile uint8_t *)(bios + 0x555) = 0x55; - *(volatile uint8_t *)(bios + 0xAAA) = 0x90; + writeb(0xAA, bios + 0xAAA); + writeb(0x55, bios + 0x555); + writeb(0x90, bios + 0xAAA); myusec_delay(10); - id1 = *(volatile uint8_t *)bios; + id1 = readb(bios); /* The data sheet says id2 is at (bios + 0x01) and id2 listed in * flash.h does not match. It should be possible to use JEDEC probe. */ - id2 = *(volatile uint8_t *)(bios + 0x02); + id2 = readb(bios + 0x02); - *(volatile uint8_t *)(bios + 0xAAA) = 0xAA; - *(volatile uint8_t *)(bios + 0x555) = 0x55; - *(volatile uint8_t *)(bios + 0xAAA) = 0xF0; + writeb(0xAA, bios + 0xAAA); + writeb(0x55, bios + 0x555); + writeb(0xF0, bios + 0xAAA); myusec_delay(10); @@ -87,13 +87,13 @@ int erase_m29f400bt(struct flashchip *flash) { volatile uint8_t *bios = flash->virtual_memory; - *(volatile uint8_t *)(bios + 0xAAA) = 0xAA; - *(volatile uint8_t *)(bios + 0x555) = 0x55; - *(volatile uint8_t *)(bios + 0xAAA) = 0x80; + writeb(0xAA, bios + 0xAAA); + writeb(0x55, bios + 0x555); + writeb(0x80, bios + 0xAAA); - *(volatile uint8_t *)(bios + 0xAAA) = 0xAA; - *(volatile uint8_t *)(bios + 0x555) = 0x55; - *(volatile uint8_t *)(bios + 0xAAA) = 0x10; + writeb(0xAA, bios + 0xAAA); + writeb(0x55, bios + 0x555); + writeb(0x10, bios + 0xAAA); myusec_delay(10); toggle_ready_jedec(bios); @@ -104,14 +104,14 @@ int erase_m29f400bt(struct flashchip *flash) int block_erase_m29f400bt(volatile uint8_t *bios, volatile uint8_t *dst) { - *(volatile uint8_t *)(bios + 0xAAA) = 0xAA; - *(volatile uint8_t *)(bios + 0x555) = 0x55; - *(volatile uint8_t *)(bios + 0xAAA) = 0x80; + writeb(0xAA, bios + 0xAAA); + writeb(0x55, bios + 0x555); + writeb(0x80, bios + 0xAAA); - *(volatile uint8_t *)(bios + 0xAAA) = 0xAA; - *(volatile uint8_t *)(bios + 0x555) = 0x55; + writeb(0xAA, bios + 0xAAA); + writeb(0x55, bios + 0x555); //*(volatile uint8_t *) (bios + 0xAAA) = 0x10; - *dst = 0x30; + writeb(0x30, dst); myusec_delay(10); toggle_ready_jedec(bios); -- cgit v1.1