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microwatt/litedram/gen-src/sdram_init/main.c

91 lines
2.1 KiB
C

#include <unistd.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdarg.h>
#include <stdio.h>
#include <generated/git.h>
#include "microwatt_soc.h"
#include "io.h"
#include "sdram.h"
#include "console.h"
int _printf(const char *fmt, ...)
{
int count;
char buffer[320];
va_list ap;
va_start(ap, fmt);
count = vsnprintf(buffer, sizeof(buffer), fmt, ap);
va_end(ap);
puts(buffer);
return count;
}
void flush_cpu_dcache(void)
{
}
void flush_cpu_icache(void)
{
__asm__ volatile ("icbi 0,0; isync" : : : "memory");
}
void main(void)
{
unsigned long long ftr, val;
/* Init the UART */
potato_uart_init();
printf("\n\nWelcome to Microwatt !\n\n");
/* TODO: Add core version information somewhere in syscon, possibly
* extracted from git
*/
printf(" Soc signature: %016llx\n",
(unsigned long long)readq(SYSCON_BASE + SYS_REG_SIGNATURE));
printf(" Soc features: ");
ftr = readq(SYSCON_BASE + SYS_REG_INFO);
if (ftr & SYS_REG_INFO_HAS_UART)
printf("UART ");
if (ftr & SYS_REG_INFO_HAS_DRAM)
printf("DRAM ");
if (ftr & SYS_REG_INFO_HAS_BRAM)
printf("BRAM ");
printf("\n");
if (ftr & SYS_REG_INFO_HAS_BRAM) {
val = readq(SYSCON_BASE + SYS_REG_BRAMINFO) & SYS_REG_BRAMINFO_SIZE_MASK;
printf(" BRAM: %lld KB\n", val / 1024);
}
if (ftr & SYS_REG_INFO_HAS_DRAM) {
val = readq(SYSCON_BASE + SYS_REG_DRAMINFO) & SYS_REG_DRAMINFO_SIZE_MASK;
printf(" DRAM: %lld MB\n", val / (1024 * 1024));
val = readq(SYSCON_BASE + SYS_REG_DRAMINITINFO);
printf(" DRAM INIT: %lld KB\n", val / 1024);
}
val = readq(SYSCON_BASE + SYS_REG_CLKINFO) & SYS_REG_CLKINFO_FREQ_MASK;
printf(" CLK: %lld MHz\n", val / 1000000);
printf("\n");
if (ftr & SYS_REG_INFO_HAS_DRAM) {
printf("LiteDRAM built from Migen %s and LiteX %s\n",
MIGEN_GIT_SHA1, LITEX_GIT_SHA1);
sdrinit();
}
if (ftr & SYS_REG_INFO_HAS_BRAM)
printf("Booting from BRAM...\n");
else {
void *s = (void *)(DRAM_INIT_BASE + 0x4000);
void *d = (void *)DRAM_BASE;
int sz = (0x10000 - 0x4000);
printf("Copying payload to DRAM...\n");
memcpy(d, s, sz);
printf("Booting from DRAM...\n");
flush_cpu_icache();
}
}