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authorCarl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>2009-03-05 19:24:22 +0000
committerCarl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>2009-03-05 19:24:22 +0000
commitac12ecd27a8e32a02193ea22dc36c89a060cc22e (patch)
tree278f567c693fcc0f1b46149bb1f571d655661c30 /util/flashrom/82802ab.c
parent51001fbd81543d738a07cd36063fe5705eeff3ad (diff)
downloadcoreboot-ac12ecd27a8e32a02193ea22dc36c89a060cc22e.tar.xz
flashrom: 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. Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> Acked-by: FENG Yu Ning <fengyuning1984@gmail.com> Tested-by: Joe Julian git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3971 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'util/flashrom/82802ab.c')
-rw-r--r--util/flashrom/82802ab.c54
1 files changed, 27 insertions, 27 deletions
diff --git a/util/flashrom/82802ab.c b/util/flashrom/82802ab.c
index 5e5b1a59ad..9bbee8d466 100644
--- a/util/flashrom/82802ab.c
+++ b/util/flashrom/82802ab.c
@@ -49,23 +49,23 @@ int probe_82802ab(struct flashchip *flash)
uint8_t id1, id2;
#if 0
- *(volatile uint8_t *)(bios + 0x5555) = 0xAA;
- *(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
- *(volatile uint8_t *)(bios + 0x5555) = 0x90;
+ writeb(0xAA, bios + 0x5555);
+ writeb(0x55, bios + 0x2AAA);
+ writeb(0x90, bios + 0x5555);
#endif
- *bios = 0xff;
+ writeb(0xff, bios);
myusec_delay(10);
- *bios = 0x90;
+ writeb(0x90, bios);
myusec_delay(10);
- id1 = *(volatile uint8_t *)bios;
- id2 = *(volatile uint8_t *)(bios + 0x01);
+ id1 = readb(bios);
+ id2 = readb(bios + 0x01);
/* Leave ID mode */
- *(volatile uint8_t *)(bios + 0x5555) = 0xAA;
- *(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
- *(volatile uint8_t *)(bios + 0x5555) = 0xF0;
+ writeb(0xAA, bios + 0x5555);
+ writeb(0x55, bios + 0x2AAA);
+ writeb(0xF0, bios + 0x5555);
myusec_delay(10);
@@ -84,25 +84,25 @@ uint8_t wait_82802ab(volatile uint8_t *bios)
uint8_t status;
uint8_t id1, id2;
- *bios = 0x70;
- if ((*bios & 0x80) == 0) { // it's busy
- while ((*bios & 0x80) == 0) ;
+ writeb(0x70, bios);
+ if ((readb(bios) & 0x80) == 0) { // it's busy
+ while ((readb(bios) & 0x80) == 0) ;
}
- status = *bios;
+ status = readb(bios);
// put another command to get out of status register mode
- *bios = 0x90;
+ writeb(0x90, bios);
myusec_delay(10);
- id1 = *(volatile uint8_t *)bios;
- id2 = *(volatile uint8_t *)(bios + 0x01);
+ id1 = readb(bios);
+ id2 = readb(bios + 0x01);
// this is needed to jam it out of "read id" mode
- *(volatile uint8_t *)(bios + 0x5555) = 0xAA;
- *(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
- *(volatile uint8_t *)(bios + 0x5555) = 0xF0;
+ writeb(0xAA, bios + 0x5555);
+ writeb(0x55, bios + 0x2AAA);
+ writeb(0xF0, bios + 0x5555);
return status;
}
@@ -115,23 +115,23 @@ int erase_82802ab_block(struct flashchip *flash, int offset)
uint8_t status;
// clear status register
- *bios = 0x50;
+ writeb(0x50, bios);
//printf("Erase at %p\n", bios);
// clear write protect
//printf("write protect is at %p\n", (wrprotect));
//printf("write protect is 0x%x\n", *(wrprotect));
- *(wrprotect) = 0;
+ writeb(0, wrprotect);
//printf("write protect is 0x%x\n", *(wrprotect));
// now start it
- *(volatile uint8_t *)(bios) = 0x20;
- *(volatile uint8_t *)(bios) = 0xd0;
+ writeb(0x20, bios);
+ writeb(0xd0, bios);
myusec_delay(10);
// now let's see what the register is
status = wait_82802ab(flash->virtual_memory);
//print_82802ab_status(status);
for (j = 0; j < flash->page_size; j++) {
- if (*(bios + j) != 0xFF) {
+ if (readb(bios + j) != 0xFF) {
printf("BLOCK ERASE failed at 0x%x\n", offset);
return -1;
}
@@ -162,8 +162,8 @@ void write_page_82802ab(volatile uint8_t *bios, uint8_t *src,
for (i = 0; i < page_size; i++) {
/* transfer data from source to destination */
- *dst = 0x40;
- *dst++ = *src++;
+ writeb(0x40, dst);
+ writeb(*src++, dst++);
wait_82802ab(bios);
}
}