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software/liblitespi: add read_id()

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Andrew Dennison 2023-05-30 15:18:01 +10:00 committed by Florent Kermarrec
parent d0b7f54d27
commit 9c426c14a2
1 changed files with 19 additions and 0 deletions
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19
litex/soc/software/liblitespi/spiflash.c
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@ -123,6 +123,23 @@ static void transfer_cmd(uint8_t *bs, uint8_t *resp, int len)
flush_cpu_dcache();
}
static uint32_t spiflash_read_id_register(void)
{
volatile uint8_t buf[4];
w_buf[0] = 0x9F;
w_buf[1] = 0x00;
transfer_cmd(w_buf, buf, 4);
#ifdef SPIFLASH_DEBUG
printf("[ID: %02x %02x %02x %02x]", buf[0], buf[1], buf[2], buf[3]);
#endif
/* FIXME normally the status should be in buf[1],
but we have to read it a few more times to be
stable for unknown reasons */
return buf[3];
}
static uint32_t spiflash_read_status_register(void)
{
volatile uint8_t buf[4];
@ -254,6 +271,8 @@ void spiflash_init(void)
#ifdef CSR_SPIFLASH_CORE_MASTER_CS_ADDR
spiflash_read_id_register();
/* Quad / QPI Configuration. */
#ifdef SPIFLASH_MODULE_QUAD_CAPABLE
printf("Enabling Quad mode...\n");