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software/bios/main: Rewrite HyperRAM init/config.

This commit is contained in:
Florent Kermarrec 2024-04-15 16:03:55 +02:00
parent 67586e8a24
commit ebabe82c70
1 changed files with 77 additions and 40 deletions
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117
litex/soc/software/bios/main.c
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@ -175,48 +175,85 @@ __attribute__((__used__)) int main(int i, char **c)
sdr_ok = 1;
#ifdef CSR_HYPERRAM_BASE
/* HyperRAM Configuration */
#ifdef CSR_HYPERRAM_BASE /* FIXME: Move to libbase/hyperram.h/c? */
/* Helper Functions */
uint16_t config_reg_0;
hyperram_config_write(7 << CSR_HYPERRAM_CONFIG_LATENCY_OFFSET);
hyperram_reg_control_write(
0 << CSR_HYPERRAM_REG_CONTROL_WRITE_OFFSET |
1 << CSR_HYPERRAM_REG_CONTROL_READ_OFFSET |
2 << CSR_HYPERRAM_REG_CONTROL_ADDR_OFFSET
);
while ((hyperram_reg_status_read() & (1 << CSR_HYPERRAM_REG_STATUS_READ_DONE_OFFSET)) == 0);
config_reg_0 = hyperram_reg_rdata_read();
printf("Configuration Register 0 prev : %08lx\n", config_reg_0);
config_reg_0 &= ~(0b1 << 3); /* Enable Variable Latency */
config_reg_0 &= ~(0b1111 << 4); /* Clear Initial Latency */
//config_reg_0 |= (0b0010 << 4); /* Initial Latency of 7 */
//config_reg_0 |= (0b0001 << 4); /* Initial Latency of 6 */
//config_reg_0 |= (0b0000 << 4); /* Initial Latency of 5 */
//config_reg_0 |= (0b1111 << 4); /* Initial Latency of 4 */
config_reg_0 |= (0b1110 << 4); /* Initial Latency of 3 */
printf("Configuration Register 0 update : %08lx\n", config_reg_0);
hyperram_reg_wdata_write(config_reg_0);
hyperram_reg_control_write(
1 << CSR_HYPERRAM_REG_CONTROL_WRITE_OFFSET |
0 << CSR_HYPERRAM_REG_CONTROL_READ_OFFSET |
2 << CSR_HYPERRAM_REG_CONTROL_ADDR_OFFSET
);
while ((hyperram_reg_status_read() & (1 << CSR_HYPERRAM_REG_STATUS_WRITE_DONE_OFFSET)) == 0);
//hyperram_config_write(7 << CSR_HYPERRAM_CONFIG_LATENCY_OFFSET);
//hyperram_config_write(6 << CSR_HYPERRAM_CONFIG_LATENCY_OFFSET);
//hyperram_config_write(5 << CSR_HYPERRAM_CONFIG_LATENCY_OFFSET);
//hyperram_config_write(4 << CSR_HYPERRAM_CONFIG_LATENCY_OFFSET);
hyperram_config_write(3 << CSR_HYPERRAM_CONFIG_LATENCY_OFFSET);
hyperram_reg_control_write(
0 << CSR_HYPERRAM_REG_CONTROL_WRITE_OFFSET |
1 << CSR_HYPERRAM_REG_CONTROL_READ_OFFSET |
2 << CSR_HYPERRAM_REG_CONTROL_ADDR_OFFSET
);
while ((hyperram_reg_status_read() & (1 << CSR_HYPERRAM_REG_STATUS_READ_DONE_OFFSET)) == 0);
config_reg_0 = hyperram_reg_rdata_read();
printf("Configuration Register 0 new : %08lx\n", config_reg_0);
printf("HyperRAM init...\n");
void hyperram_write_reg(uint16_t reg_addr, uint16_t data) {
/* Write data to the register */
hyperram_reg_wdata_write(data);
hyperram_reg_control_write(
1 << CSR_HYPERRAM_REG_CONTROL_WRITE_OFFSET |
0 << CSR_HYPERRAM_REG_CONTROL_READ_OFFSET |
reg_addr << CSR_HYPERRAM_REG_CONTROL_ADDR_OFFSET
);
/* Wait for write to complete */
while ((hyperram_reg_status_read() & (1 << CSR_HYPERRAM_REG_STATUS_WRITE_DONE_OFFSET)) == 0);
}
uint16_t hyperram_read_reg(uint16_t reg_addr) {
/* Read data from the register */
hyperram_reg_control_write(
0 << CSR_HYPERRAM_REG_CONTROL_WRITE_OFFSET |
1 << CSR_HYPERRAM_REG_CONTROL_READ_OFFSET |
reg_addr << CSR_HYPERRAM_REG_CONTROL_ADDR_OFFSET
);
/* Wait for read to complete */
while ((hyperram_reg_status_read() & (1 << CSR_HYPERRAM_REG_STATUS_READ_DONE_OFFSET)) == 0);
return hyperram_reg_rdata_read();
}
/* Configuration and Utility Functions */
uint16_t hyperram_get_core_latency_setting(uint32_t clk_freq) {
/* Raw clock latency settings for the HyperRAM core */
if (clk_freq <= 85000000) return 3; /* 3 Clock Latency */
if (clk_freq <= 104000000) return 4; /* 4 Clock Latency */
if (clk_freq <= 133000000) return 5; /* 5 Clock Latency */
if (clk_freq <= 166000000) return 6; /* 6 Clock Latency */
if (clk_freq <= 250000000) return 7; /* 7 Clock Latency */
return 7; /* Default to highest latency for safety */
}
uint16_t hyperram_get_chip_latency_setting(uint32_t clk_freq) {
/* LUT/Translated settings for the HyperRAM chip */
if (clk_freq <= 85000000) return 0b1110; /* 3 Clock Latency */
if (clk_freq <= 104000000) return 0b1111; /* 4 Clock Latency */
if (clk_freq <= 133000000) return 0b0000; /* 5 Clock Latency */
if (clk_freq <= 166000000) return 0b0001; /* 6 Clock Latency */
if (clk_freq <= 250000000) return 0b0010; /* 7 Clock Latency */
return 0b0010; /* Default to highest latency for safety */
}
void hyperram_configure_latency(void) {
uint16_t config_reg_0 = 0x8f2f;
uint16_t core_latency_setting;
uint16_t chip_latency_setting;
/* Compute Latency settings */
core_latency_setting = hyperram_get_core_latency_setting(CONFIG_CLOCK_FREQUENCY/4);
chip_latency_setting = hyperram_get_chip_latency_setting(CONFIG_CLOCK_FREQUENCY/4);
/* Write Latency to HyperRAM Core */
printf("HyperRAM Core Latency: %d CK (X1).\n", core_latency_setting);
hyperram_config_write(core_latency_setting << CSR_HYPERRAM_CONFIG_LATENCY_OFFSET);
/* Enable Variable Latency on HyperRAM Chip */
config_reg_0 &= ~(0b1 << 3); /* Enable Variable Latency */
/* Update Latency on HyperRAM Chip */
config_reg_0 &= ~(0b1111 << 4);
config_reg_0 |= chip_latency_setting << 4;
/* Write Configuration Register 0 to HyperRAM Chip */
hyperram_write_reg(2, config_reg_0);
/* Read current configuration */
config_reg_0 = hyperram_read_reg(2);
printf("HyperRAM Configuration Register 0: %08x\n", config_reg_0);
}
hyperram_configure_latency();
printf("\n");
#endif
#if defined(CSR_ETHMAC_BASE) || defined(MAIN_RAM_BASE) || defined(CSR_SPIFLASH_CORE_BASE)