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software/liblitedram: add sdrmpr functions.

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This commit is contained in:
Florent Kermarrec 2020-09-03 15:25:04 +02:00
parent 3e083958b0
commit ae152e28a7
2 changed files with 67 additions and 0 deletions
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62
litex/soc/software/liblitedram/sdram.c
View file

@ -841,4 +841,66 @@ int sdrinit(void)
return 1;
}
#define MPR0_SEL (0 << 0)
#define MPR1_SEL (1 << 0)
#define MPR2_SEL (2 << 0)
#define MPR3_SEL (3 << 0)
#define MPR_ENABLE (1 << 2)
#define MPR_READ_SERIAL (0 << 11)
#define MPR_READ_PARALLEL (1 << 11)
#define MPR_READ_STAGGERED (2 << 11)
void sdrmrwr(char reg, int value) {
sdram_dfii_pi0_address_write(value);
sdram_dfii_pi0_baddress_write(reg);
command_p0(DFII_COMMAND_RAS|DFII_COMMAND_CAS|DFII_COMMAND_WE|DFII_COMMAND_CS);
}
void sdrmpron(char mpr)
{
sdrmrwr(3, MPR_READ_SERIAL | MPR_ENABLE | mpr);
}
void sdrmproff(void)
{
sdrmrwr(3, 0);
}
void sdrmpr(void)
{
int module, phase;
printf("Read SDRAM MPR...\n");
/* rst phy */
for(module=0; module<SDRAM_PHY_MODULES; module++) {
#ifdef SDRAM_PHY_WRITE_LEVELING_CAPABLE
write_delay_rst(module);
#endif
read_delay_rst(module);
read_bitslip_rst(module);
}
/* software control */
sdrsw();
printf("Reads with MPR0 (0b01010101) enabled...\n");
sdrmpron(MPR0_SEL);
command_prd(DFII_COMMAND_CAS|DFII_COMMAND_CS|DFII_COMMAND_RDDATA);
cdelay(15);
for (module=0; module < SDRAM_PHY_MODULES; module++) {
printf("m%d: ", module);
for(phase=0; phase<SDRAM_PHY_PHASES; phase++) {
printf("%d", MMPTR(sdram_dfii_pix_rddata_addr[phase]+4*(SDRAM_PHY_MODULES-module-1)) & 0x1);
printf("%d", MMPTR(sdram_dfii_pix_rddata_addr[phase]+4*(2*SDRAM_PHY_MODULES-module-1)) & 0x1);
}
printf("\n");
}
sdrmproff();
/* hardware control */
sdrhw();
}
#endif

5
litex/soc/software/liblitedram/sdram.h
View file

@ -23,4 +23,9 @@ int sdrlevel(void);
void sdrcal(void);
int sdrinit(void);
void sdrmrwr(char reg, int value);
void sdrmpron(char mpr);
void sdrmproff(void);
void sdrmpr(void);
#endif /* __SDRAM_H */