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software/liblitesdcard/bios: add sdfreq command to configure SDCard clock frequency.

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This commit is contained in:
Florent Kermarrec 2020-08-26 12:43:09 +02:00
parent 3897acb9e4
commit 4ac0ed49e1
3 changed files with 35 additions and 1 deletions
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28
litex/soc/software/bios/cmds/cmd_litesdcard.c
View file

@ -20,6 +20,34 @@
define_command(sdinit, sdcard_init, "Initialize SDCard", LITESDCARD_CMDS);
#endif
/**
* Command "sdfreq"
*
* Set SDcard clock frequency
*
*/
#ifdef CSR_SDCORE_BASE
static void sdfreq(int nb_params, char **params)
{
unsigned int freq;
char *c;
if (nb_params < 1) {
printf("sdfreq <freq>");
return;
}
freq = strtoul(params[0], &c, 0);
if (*c != 0) {
printf("Incorrect freq");
return;
}
sdcard_set_clk_freq(freq);
}
define_command(sdfreq, sdfreq, "Set SDCard clock freq", LITESDCARD_CMDS);
#endif
/**
* Command "sdread"

2
litex/soc/software/liblitesdcard/sdcard.c
View file

@ -96,7 +96,7 @@ static uint32_t log2(uint32_t x)
return r;
}
static void sdcard_set_clk_freq(uint32_t clk_freq) {
void sdcard_set_clk_freq(uint32_t clk_freq) {
uint32_t divider;
divider = CONFIG_CLOCK_FREQUENCY/clk_freq + 1;
divider = (1 << log2(divider));

6
litex/soc/software/liblitesdcard/sdcard.h
View file

@ -60,6 +60,12 @@ int sdcard_wait_cmd_done(void);
int sdcard_wait_data_done(void);
int sdcard_wait_response(void);
/*-----------------------------------------------------------------------*/
/* SDCard clocker functions */
/*-----------------------------------------------------------------------*/
void sdcard_set_clk_freq(uint32_t clk_freq);
/*-----------------------------------------------------------------------*/
/* SDCard commands functions */
/*-----------------------------------------------------------------------*/