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software/litesdcard: use new clocking and use slow clock during initialization.

This commit is contained in:
Florent Kermarrec 2020-07-07 19:59:34 +02:00
parent 52f36b1257
commit 8af4e05c7f
1 changed files with 13 additions and 8 deletions
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21
litex/soc/software/liblitesdcard/sdcard.c
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@ -21,8 +21,12 @@
//#define SDCARD_DEBUG
//#define SDCARD_CMD23_SUPPORT
#ifndef SDCARD_CLK_FREQ_INIT
#define SDCARD_CLK_FREQ_INIT 400000
#endif
#ifndef SDCARD_CLK_FREQ
#define SDCARD_CLK_FREQ 16000000
#define SDCARD_CLK_FREQ 25000000
#endif
unsigned int sdcard_response[SD_CMD_RESPONSE_SIZE/4];
@ -120,17 +124,14 @@ static void sdcard_set_clk_freq(uint32_t clk_freq) {
uint32_t divider;
divider = CONFIG_CLOCK_FREQUENCY/clk_freq + 1;
divider = (1 << log2(divider));
//#ifdef SDCARD_DEBUG
#ifdef SDCARD_DEBUG
printf("Setting SDCard clk freq to ");
if (clk_freq > 1000000)
printf("%d MHz\n", (CONFIG_CLOCK_FREQUENCY/divider)/1000000);
else
printf("%d KHz\n", (CONFIG_CLOCK_FREQUENCY/divider)/1000);
//#endif
sdphy_clocker_enable_write(0);
#endif
sdphy_clocker_divider_write(divider);
sdphy_clocker_enable_write(1);
}
/*-----------------------------------------------------------------------*/
@ -453,8 +454,8 @@ int sdcard_init(void) {
unsigned short rca;
uint16_t timeout;
/* Set SD clk freq to operational frequency */
sdcard_set_clk_freq(SDCARD_CLK_FREQ);
/* Set SD clk freq to Initialization frequency */
sdcard_set_clk_freq(SDCARD_CLK_FREQ_INIT);
busy_wait(1);
for (timeout=1000; timeout>0; timeout--) {
@ -474,6 +475,10 @@ int sdcard_init(void) {
if (sdcard_send_ext_csd() != SD_OK)
return 0;
/* Set SD clk freq to Operational frequency */
sdcard_set_clk_freq(SDCARD_CLK_FREQ);
busy_wait(1);
/* Set SDCard in Operational state */
for (timeout=1000; timeout>0; timeout--) {
sdcard_app_cmd(0);