From f85dc92d2a2b336f9844c0eddcdf4df4c0dc9fbf Mon Sep 17 00:00:00 2001 From: David Brownell Date: Wed, 16 Dec 2009 14:17:31 -0800 Subject: stellaris: avoid chip writes Previously "reading" clock info (and part info) also, as a side effect, wrote the flash timing register. Instead, be more safe: "reading" should only read. Write paths still refresh timing, coping with changes the application code may have made. Also rename the routine which sets flash timing, indicating what it's really doing; it's got nothing to do with a "mode". Signed-off-by: David Brownell --- src/flash/nor/stellaris.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) (limited to 'src') diff --git a/src/flash/nor/stellaris.c b/src/flash/nor/stellaris.c index 103202d2..8b0d9d30 100644 --- a/src/flash/nor/stellaris.c +++ b/src/flash/nor/stellaris.c @@ -345,8 +345,8 @@ static uint32_t stellaris_get_flash_status(struct flash_bank *bank) return fmc; } -/* Setup the timimg registers */ -static void stellaris_set_flash_mode(struct flash_bank *bank,int mode) +/* Set the flash timimg register to match current clocking */ +static void stellaris_set_flash_timing(struct flash_bank *bank) { struct stellaris_flash_bank *stellaris_info = bank->driver_priv; struct target *target = bank->target; @@ -471,9 +471,6 @@ static void stellaris_read_clock_info(struct flash_bank *bank) stellaris_info->mck_freq = mainfreq/(1 + sysdiv); else stellaris_info->mck_freq = mainfreq; - - /* Forget old flash timing */ - stellaris_set_flash_mode(bank, 0); } #if 0 @@ -714,9 +711,9 @@ static int stellaris_erase(struct flash_bank *bank, int first, int last) return stellaris_mass_erase(bank); } - /* Configure the flash controller timing */ + /* Refresh flash controller timing */ stellaris_read_clock_info(bank); - stellaris_set_flash_mode(bank,0); + stellaris_set_flash_timing(bank); /* Clear and disable flash programming interrupts */ target_write_u32(target, FLASH_CIM, 0); @@ -791,9 +788,9 @@ static int stellaris_protect(struct flash_bank *bank, int set, int first, int la return ERROR_FLASH_OPERATION_FAILED; } - /* Configure the flash controller timing */ + /* Refresh flash controller timing */ stellaris_read_clock_info(bank); - stellaris_set_flash_mode(bank, 0); + stellaris_set_flash_timing(bank); /* convert from pages to lockregions */ first /= 2; @@ -1011,9 +1008,9 @@ static int stellaris_write(struct flash_bank *bank, uint8_t *buffer, uint32_t of if (offset + count > bank->size) return ERROR_FLASH_DST_OUT_OF_BANK; - /* Configure the flash controller timing */ + /* Refresh flash controller timing */ stellaris_read_clock_info(bank); - stellaris_set_flash_mode(bank, 0); + stellaris_set_flash_timing(bank); /* Clear and disable flash programming interrupts */ target_write_u32(target, FLASH_CIM, 0); @@ -1156,9 +1153,9 @@ static int stellaris_mass_erase(struct flash_bank *bank) return ERROR_FLASH_OPERATION_FAILED; } - /* Configure the flash controller timing */ + /* Refresh flash controller timing */ stellaris_read_clock_info(bank); - stellaris_set_flash_mode(bank, 0); + stellaris_set_flash_timing(bank); /* Clear and disable flash programming interrupts */ target_write_u32(target, FLASH_CIM, 0); -- cgit v1.2.3