diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/northbridge/intel/i82830/raminit.c | 96 |
1 files changed, 46 insertions, 50 deletions
diff --git a/src/northbridge/intel/i82830/raminit.c b/src/northbridge/intel/i82830/raminit.c index 1deb2572c8..b6e8661745 100644 --- a/src/northbridge/intel/i82830/raminit.c +++ b/src/northbridge/intel/i82830/raminit.c @@ -53,7 +53,7 @@ Macros and definitions. * 0x2 for Refresh interval 7.8 us for 133MHz * 0x7 /* Refresh interval 128 Clocks. (Fast Refresh Mode) */ -#define RAM_COMMAND_REFRESH 0x2 +#define RAM_COMMAND_REFRESH 0x1 /* DRC[6:4] - SDRAM Mode Select (SMS). */ #define RAM_COMMAND_SELF_REFRESH 0x0 @@ -76,7 +76,7 @@ static void do_ram_command(const struct mem_controller *ctrl, uint32_t command, uint32_t addr_offset) { int i; - uint8_t reg8, reg8_2 = 0; + uint8_t dimm_start, dimm_end; uint32_t reg32; /* Configure the RAM command. */ @@ -84,28 +84,27 @@ static void do_ram_command(const struct mem_controller *ctrl, uint32_t command, /* Clear bits 29, 10-8, 6-4. */ reg32 &= 0xdffff88f; reg32 |= command << 4; - /* If RAM_COMMAND_NORMAL set the refresh mode and IC bit. */ - if (command == RAM_COMMAND_NORMAL) - reg32 |= ((RAM_COMMAND_REFRESH << 8) | (RAM_COMMAND_IC << 29)); pci_write_config32(ctrl->d0, DRC, reg32); - /* RAM_COMMAND_NORMAL affects only the memory controller and - doesn't need to be "sent" to the DIMMs. */ - /* if (command == RAM_COMMAND_NORMAL) return; */ - - PRINT_DEBUG(" Sending RAM command 0x"); - PRINT_DEBUG_HEX32(reg32); - PRINT_DEBUG(" to 0x"); - PRINT_DEBUG_HEX32(0 + addr_offset); - PRINT_DEBUG("\r\n"); - - /* NOTE: Dual-sided ready. */ - read32(0 + addr_offset); - for (i = 0; i < 4; i++) { - reg8 = pci_read_config8(ctrl->d0, DRB + i); - if (reg8 != reg8_2) - read32(reg8 * 32 * 1024 * 1024); - reg8_2 = reg8; + /* Send the ram command to each row of memory. + * (DIMM_SOCKETS * 2) is the maximum number of rows possible. + * Note: Each DRB defines the upper boundary address of + * each SDRAM row in 32-MB granularity. + */ + dimm_start = 0; + + for (i = 0; i < (DIMM_SOCKETS * 2); i++) { + dimm_end = pci_read_config8(ctrl->d0, DRB + i); + if (dimm_end > dimm_start) { + PRINT_DEBUG(" Sending RAM command 0x"); + PRINT_DEBUG_HEX32(reg32); + PRINT_DEBUG(" to 0x"); + PRINT_DEBUG_HEX32((dimm_start * 32 * 1024 * 1024) + addr_offset); + PRINT_DEBUG("\r\n"); + read32((dimm_start * 32 * 1024 * 1024) + addr_offset); + } + /* Set the start of the next DIMM. */ + dimm_start = dimm_end; } } @@ -316,38 +315,28 @@ static void set_dram_row_attributes(const struct mem_controller *ctrl) value = spd_read_byte(device, 5); if (value == 1) { - switch (dra) { - case 2: /* 2KB */ - dra = 0xF0; - break; - case 4: /* 4KB */ - dra = 0xF1; - break; - case 8: /* 8KB */ - dra = 0xF2; - break; - case 16: /* 16KB */ - dra = 0xF3; - break; - default: + if (dra == 2) { + dra = 0xF0; /* 2KB */ + } else if (dra == 4) { + dra = 0xF1; /* 4KB */ + } else if (dra == 8) { + dra = 0xF2; /* 8KB */ + } else if (dra == 16) { + dra = 0xF3; /* 16KB */ + } else { print_err("Page size not supported\r\n"); die("HALT\r\n"); } } else if (value == 2) { - switch (dra) { - case 2: /* 2KB */ - dra = 0x00; - break; - case 4: /* 4KB */ - dra = 0x11; - break; - case 8: /* 8KB */ - dra = 0x22; - break; - case 16: /* 16KB */ - dra = 0x33; - break; - default: + if (dra == 2) { + dra = 0x00; /* 2KB */ + } else if (dra == 4) { + dra = 0x11; /* 4KB */ + } else if (dra == 8) { + dra = 0x22; /* 8KB */ + } else if (dra == 16) { + dra = 0x33; /* 16KB */ + } else { print_err("Page size not supported\r\n"); die("HALT\r\n"); } @@ -471,6 +460,7 @@ static void sdram_set_spd_registers(const struct mem_controller *ctrl) static void sdram_enable(int controllers, const struct mem_controller *ctrl) { int i; + uint32_t reg32; /* 0. Wait until power/voltages and clocks are stable (200us). */ udelay(200); @@ -503,6 +493,12 @@ static void sdram_enable(int controllers, const struct mem_controller *ctrl) do_ram_command(ctrl, RAM_COMMAND_NORMAL, 0); udelay(1); + /* 6. Enable refresh and Set initialization complete. */ + PRINT_DEBUG("RAM Enable 6: Enable Refresh and IC\r\n"); + reg32 = pci_read_config32(ctrl->d0, DRC); + reg32 |= ((RAM_COMMAND_REFRESH << 8) | (RAM_COMMAND_IC << 29)); + pci_write_config32(ctrl->d0, DRC, reg32); + PRINT_DEBUG("Northbridge following SDRAM init:\r\n"); DUMPNORTH(); } |