| /* This was originally for the e7500, modified for e7501 |
| * The primary differences are that 7501 apparently can |
| * support single channel RAM (i haven't tested), |
| * CAS1.5 is no longer supported, The ECC scrubber |
| * now supports a mode to zero RAM and init ECC in one step |
| * and the undocumented registers at 0x80 require new |
| * (undocumented) values determined by guesswork and |
| * comparison w/ OEM BIOS values. |
| * Steven James 02/06/2003 |
| */ |
| |
| /* converted to C 6/2004 yhlu */ |
| |
| |
| #include <stdint.h> |
| #include <device/pci_def.h> |
| #include <arch/io.h> |
| #include <arch/cpu.h> |
| #include <lib.h> |
| #include <stdlib.h> |
| #include <console/console.h> |
| |
| #include <cpu/x86/mtrr.h> |
| #include <cpu/x86/cache.h> |
| #include <cpu/x86/msr.h> |
| #include <assert.h> |
| #include <spd.h> |
| #include <sdram_mode.h> |
| #include <cbmem.h> |
| |
| #include "raminit.h" |
| #include "e7505.h" |
| #include "debug.h" |
| |
| /*----------------------------------------------------------------------------- |
| Definitions: |
| -----------------------------------------------------------------------------*/ |
| |
| // Uncomment this to enable run-time checking of DIMM parameters |
| // for dual-channel operation |
| // Unfortunately the code seems to chew up several K of space. |
| //#define VALIDATE_DIMM_COMPATIBILITY |
| |
| #if CONFIG_DEBUG_RAM_SETUP |
| #define RAM_DEBUG_MESSAGE(x) printk(BIOS_DEBUG, x) |
| #define RAM_DEBUG_HEX32(x) printk(BIOS_DEBUG, "%08x", x) |
| #define RAM_DEBUG_HEX8(x) printk(BIOS_DEBUG, "%02x", x) |
| #define DUMPNORTH() dump_pci_device(MCHDEV) |
| #else |
| #define RAM_DEBUG_MESSAGE(x) |
| #define RAM_DEBUG_HEX32(x) |
| #define RAM_DEBUG_HEX8(x) |
| #define DUMPNORTH() |
| #endif |
| |
| #define E7501_SDRAM_MODE (SDRAM_BURST_INTERLEAVED | SDRAM_BURST_4) |
| #define SPD_ERROR "Error reading SPD info\n" |
| |
| #define MCHDEV PCI_DEV(0,0,0) |
| #define RASDEV PCI_DEV(0,0,1) |
| #define D060DEV PCI_DEV(0,6,0) |
| |
| // NOTE: This used to be 0x100000. |
| // That doesn't work on systems where A20M# is asserted, because |
| // attempts to access 0x1000NN end up accessing 0x0000NN. |
| #define RCOMP_MMIO ((u8 *)0x200000) |
| |
| struct dimm_size { |
| unsigned long side1; |
| unsigned long side2; |
| }; |
| |
| static const uint32_t refresh_frequency[] = { |
| /* Relative frequency (array value) of each E7501 Refresh Mode Select |
| * (RMS) value (array index) |
| * 0 == least frequent refresh (longest interval between refreshes) |
| * [0] disabled -> 0 |
| * [1] 15.6 usec -> 2 |
| * [2] 7.8 usec -> 3 |
| * [3] 64 usec -> 1 |
| * [4] reserved -> 0 |
| * [5] reserved -> 0 |
| * [6] reserved -> 0 |
| * [7] 64 clocks -> 4 |
| */ |
| 0, 2, 3, 1, 0, 0, 0, 4 |
| }; |
| |
| static const uint32_t refresh_rate_map[] = { |
| /* Map the JEDEC spd refresh rates (array index) to E7501 Refresh Mode |
| * Select values (array value) |
| * These are all the rates defined by JESD21-C Appendix D, Rev. 1.0 |
| * The E7501 supports only 15.6 us (1), 7.8 us (2), 64 us (3), and |
| * 64 clock (481 ns) (7) refresh. |
| * [0] == 15.625 us -> 15.6 us |
| * [1] == 3.9 us -> 481 ns |
| * [2] == 7.8 us -> 7.8 us |
| * [3] == 31.3 us -> 15.6 us |
| * [4] == 62.5 us -> 15.6 us |
| * [5] == 125 us -> 64 us |
| */ |
| 1, 7, 2, 1, 1, 3 |
| }; |
| |
| #define MAX_SPD_REFRESH_RATE ((sizeof(refresh_rate_map) / sizeof(uint32_t)) - 1) |
| |
| #ifdef VALIDATE_DIMM_COMPATIBILITY |
| // SPD parameters that must match for dual-channel operation |
| static const uint8_t dual_channel_parameters[] = { |
| SPD_MEMORY_TYPE, |
| SPD_MODULE_VOLTAGE, |
| SPD_NUM_COLUMNS, |
| SPD_NUM_ROWS, |
| SPD_NUM_DIMM_BANKS, |
| SPD_PRIMARY_SDRAM_WIDTH, |
| SPD_NUM_BANKS_PER_SDRAM |
| }; |
| #endif /* VALIDATE_DIMM_COMPATIBILITY */ |
| |
| /* Comments here are remains of e7501 or even 855PM. |
| * They might be partially (in)correct for e7505. |
| */ |
| |
| /* (DRAM Read Timing Control, if similar to 855PM?) |
| * 0x80 - 0x81 documented differently for e7505 |
| * This register has something to do with CAS latencies, |
| * possibily this is the real chipset control. |
| * At 0x00 CAS latency 1.5 works. |
| * At 0x06 CAS latency 2.5 works. |
| * At 0x01 CAS latency 2.0 works. |
| * |
| * This is still undocumented in e7501, but with different values |
| * CAS 2.0 values taken from Intel BIOS settings, others are a guess |
| * and may be terribly wrong. Old values preserved as comments until I |
| * figure this out for sure. |
| * e7501 docs claim that CAS1.5 is unsupported, so it may or may not |
| * work at all. |
| * Steven James 02/06/2003 |
| * |
| * NOTE: values now configured in configure_e7501_cas_latency() based |
| * on SPD info and total number of DIMMs (per Intel) |
| */ |
| |
| /* FDHC - Fixed DRAM Hole Control ??? |
| * 0x58 undocumented for e7505, memory hole in southbridge configuration? |
| * [7:7] Hole_Enable |
| * 0 == No memory Hole |
| * 1 == Memory Hole from 15MB to 16MB |
| * [6:0] Reserved |
| */ |
| |
| /* Another Intel undocumented register |
| * 0x88 - 0x8B |
| * [31:31] Purpose unknown |
| * [26:26] Master DLL Reset? |
| * 0 == Normal operation? |
| * 1 == Reset? |
| * [07:07] Periodic memory recalibration? |
| * 0 == Disabled? |
| * 1 == Enabled? |
| * [04:04] Receive FIFO RE-Sync? |
| * 0 == Normal operation? |
| * 1 == Reset? |
| */ |
| |
| /* DDR RECOMP tables */ |
| // Slew table for 2x drive? |
| static const uint32_t slew_2x[] = { |
| 0x00000000, 0x76543210, 0xffffeca8, 0xffffffff, |
| 0x21000000, 0xa8765432, 0xffffffec, 0xffffffff, |
| }; |
| |
| // Pull Up / Pull Down offset table, if analogous to IXP2800? |
| static const uint32_t pull_updown_offset_table[] = { |
| 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, |
| 0x88888888, 0x88888888, 0x88888888, 0x88888888, |
| }; |
| |
| /*----------------------------------------------------------------------------- |
| Delay functions: |
| -----------------------------------------------------------------------------*/ |
| |
| /* Estimate that SLOW_DOWN_IO takes about 1 us */ |
| #define SLOW_DOWN_IO inb(0x80) |
| static void local_udelay(int i) |
| { |
| while (i--) { |
| SLOW_DOWN_IO; |
| } |
| } |
| |
| /* delay for 200us */ |
| #define DO_DELAY local_udelay(200) |
| #define EXTRA_DELAY DO_DELAY |
| |
| /*----------------------------------------------------------------------------- |
| Handle (undocumented) control bits MCHTST and PCI_DEV(0,6,0) |
| -----------------------------------------------------------------------------*/ |
| typedef enum { |
| MCHTST_CMD_0, |
| D060_ENABLE, |
| D060_DISABLE, |
| RCOMP_BAR_ENABLE, |
| RCOMP_BAR_DISABLE, |
| } mchtst_cc; |
| |
| typedef enum { |
| D060_CMD_0, |
| D060_CMD_1, |
| } d060_cc; |
| |
| typedef enum { |
| RCOMP_HOLD, |
| RCOMP_RELEASE, |
| RCOMP_SMR_00, |
| RCOMP_SMR_01, |
| } rcomp_smr_cc; |
| |
| /** |
| * MCHTST - 0xF4 - 0xF7 -- Based on similarity to 855PM |
| * |
| * [31:31] Purpose unknown |
| * [30:30] Purpose unknown |
| * [29:23] Unknown - not used? |
| * [22:22] System Memory MMR Enable |
| * 0 == Disable: mem space and BAR at 0x14 are not accessible |
| * 1 == Enable: mem space and BAR at 0x14 are accessible |
| * [21:20] Purpose unknown |
| * [19:02] Unknown - not used? |
| * [01:01] D6EN (Device #6 enable) |
| * 0 == Disable |
| * 1 == Enable |
| * [00:00] Unknown - not used? |
| */ |
| static void mchtest_control(mchtst_cc cmd) |
| { |
| uint32_t dword = pci_read_config32(MCHDEV, MCHTST); |
| switch (cmd) { |
| case MCHTST_CMD_0: |
| dword &= ~(3 << 30); |
| break; |
| case RCOMP_BAR_ENABLE: |
| dword |= (1 << 22); |
| break; |
| case RCOMP_BAR_DISABLE: |
| dword &= ~(1 << 22); |
| break; |
| case D060_ENABLE: |
| dword |= (1 << 1); |
| break; |
| case D060_DISABLE: |
| dword &= ~(1 << 1); |
| break; |
| }; |
| pci_write_config32(MCHDEV, MCHTST, dword); |
| } |
| |
| |
| /** |
| * |
| */ |
| static void d060_control(d060_cc cmd) |
| { |
| mchtest_control(D060_ENABLE); |
| uint32_t dword = pci_read_config32(D060DEV, 0xf0); |
| switch (cmd) { |
| case D060_CMD_0: |
| dword |= (1 << 2); |
| break; |
| case D060_CMD_1: |
| dword |= (3 << 27); |
| break; |
| } |
| pci_write_config32(D060DEV, 0xf0, dword); |
| mchtest_control(D060_DISABLE); |
| } |
| |
| /** |
| * |
| */ |
| static void rcomp_smr_control(rcomp_smr_cc cmd) |
| { |
| uint32_t dword = read32(RCOMP_MMIO + SMRCTL); |
| switch (cmd) { |
| case RCOMP_HOLD: |
| dword |= (1 << 9); |
| break; |
| case RCOMP_RELEASE: |
| dword &= ~((1 << 9) | (3 << 0)); |
| dword |= (1 << 10) | (1 << 0); |
| break; |
| case RCOMP_SMR_00: |
| dword &= ~(1 << 8); |
| break; |
| case RCOMP_SMR_01: |
| dword |= (1 << 10) | (1 << 8); |
| break; |
| } |
| write32(RCOMP_MMIO + SMRCTL, dword); |
| } |
| |
| /*----------------------------------------------------------------------------- |
| Serial presence detect (SPD) functions: |
| -----------------------------------------------------------------------------*/ |
| |
| static void die_on_spd_error(int spd_return_value) |
| { |
| if (spd_return_value < 0) |
| die("Error reading SPD info\n"); |
| } |
| |
| /** |
| * Calculate the page size for each physical bank of the DIMM: |
| * log2(page size) = (# columns) + log2(data width) |
| * |
| * NOTE: Page size is the total number of data bits in a row. |
| * |
| * @param dimm_socket_address SMBus address of DIMM socket to interrogate. |
| * @return log2(page size) for each side of the DIMM. |
| */ |
| static struct dimm_size sdram_spd_get_page_size(uint16_t dimm_socket_address) |
| { |
| uint16_t module_data_width; |
| int value; |
| struct dimm_size pgsz; |
| |
| pgsz.side1 = 0; |
| pgsz.side2 = 0; |
| |
| // Side 1 |
| value = spd_read_byte(dimm_socket_address, SPD_NUM_COLUMNS); |
| if (value < 0) |
| goto hw_err; |
| pgsz.side1 = value & 0xf; // # columns in bank 1 |
| |
| /* Get the module data width and convert it to a power of two */ |
| value = |
| spd_read_byte(dimm_socket_address, SPD_MODULE_DATA_WIDTH_MSB); |
| if (value < 0) |
| goto hw_err; |
| module_data_width = (value & 0xff) << 8; |
| |
| value = |
| spd_read_byte(dimm_socket_address, SPD_MODULE_DATA_WIDTH_LSB); |
| if (value < 0) |
| goto hw_err; |
| module_data_width |= (value & 0xff); |
| |
| pgsz.side1 += log2(module_data_width); |
| |
| /* side two */ |
| value = spd_read_byte(dimm_socket_address, SPD_NUM_DIMM_BANKS); |
| if (value < 0) |
| goto hw_err; |
| if (value > 2) |
| die("Bad SPD value\n"); |
| if (value == 2) { |
| |
| pgsz.side2 = pgsz.side1; // Assume symmetric banks until we know differently |
| value = |
| spd_read_byte(dimm_socket_address, SPD_NUM_COLUMNS); |
| if (value < 0) |
| goto hw_err; |
| if ((value & 0xf0) != 0) { |
| // Asymmetric banks |
| pgsz.side2 -= value & 0xf; /* Subtract out columns on side 1 */ |
| pgsz.side2 += (value >> 4) & 0xf; /* Add in columns on side 2 */ |
| } |
| } |
| |
| return pgsz; |
| |
| hw_err: |
| die(SPD_ERROR); |
| return pgsz; // Never reached |
| } |
| |
| /** |
| * Read the width in bits of each DIMM side's DRAMs via SPD (i.e. 4, 8, 16). |
| * |
| * @param dimm_socket_address SMBus address of DIMM socket to interrogate. |
| * @return Width in bits of each DIMM side's DRAMs. |
| */ |
| static struct dimm_size sdram_spd_get_width(uint16_t dimm_socket_address) |
| { |
| int value; |
| struct dimm_size width; |
| |
| width.side1 = 0; |
| width.side2 = 0; |
| |
| value = |
| spd_read_byte(dimm_socket_address, SPD_PRIMARY_SDRAM_WIDTH); |
| die_on_spd_error(value); |
| |
| width.side1 = value & 0x7f; // Mask off bank 2 flag |
| |
| if (value & 0x80) { |
| width.side2 = width.side1 << 1; // Bank 2 exists and is double-width |
| } else { |
| // If bank 2 exists, it's the same width as bank 1 |
| value = |
| spd_read_byte(dimm_socket_address, SPD_NUM_DIMM_BANKS); |
| die_on_spd_error(value); |
| |
| #ifdef ROMCC_IF_BUG_FIXED |
| if (value == 2) |
| width.side2 = width.side1; |
| #else |
| switch (value) { |
| case 2: |
| width.side2 = width.side1; |
| break; |
| |
| default: |
| break; |
| } |
| #endif |
| } |
| |
| return width; |
| } |
| |
| /** |
| * Calculate the log base 2 size in bits of both DIMM sides. |
| * |
| * log2(# bits) = (# columns) + log2(data width) + |
| * (# rows) + log2(banks per SDRAM) |
| * |
| * Note that it might be easier to use SPD byte 31 here, it has the DIMM size |
| * as a multiple of 4MB. The way we do it now we can size both sides of an |
| * asymmetric DIMM. |
| * |
| * @param dimm_socket_address SMBus address of DIMM socket to interrogate. |
| * @return log2(number of bits) for each side of the DIMM. |
| */ |
| static struct dimm_size spd_get_dimm_size(unsigned dimm_socket_address) |
| { |
| int value; |
| |
| // Start with log2(page size) |
| struct dimm_size sz = sdram_spd_get_page_size(dimm_socket_address); |
| |
| if (sz.side1 > 0) { |
| |
| value = spd_read_byte(dimm_socket_address, SPD_NUM_ROWS); |
| die_on_spd_error(value); |
| |
| sz.side1 += value & 0xf; |
| |
| if (sz.side2 > 0) { |
| |
| // Double-sided DIMM |
| if (value & 0xF0) |
| sz.side2 += value >> 4; // Asymmetric |
| else |
| sz.side2 += value; // Symmetric |
| } |
| |
| value = |
| spd_read_byte(dimm_socket_address, |
| SPD_NUM_BANKS_PER_SDRAM); |
| die_on_spd_error(value); |
| |
| value = log2(value); |
| sz.side1 += value; |
| if (sz.side2 > 0) |
| sz.side2 += value; |
| } |
| |
| return sz; |
| } |
| |
| #ifdef VALIDATE_DIMM_COMPATIBILITY |
| |
| /** |
| * Determine whether two DIMMs have the same value for an SPD parameter. |
| * |
| * @param spd_byte_number The SPD byte number to compare in both DIMMs. |
| * @param dimm0_address SMBus address of the 1st DIMM socket to interrogate. |
| * @param dimm1_address SMBus address of the 2nd DIMM socket to interrogate. |
| * @return 1 if both DIMM sockets report the same value for the specified |
| * SPD parameter, 0 if the values differed or an error occurred. |
| */ |
| static uint8_t are_spd_values_equal(uint8_t spd_byte_number, |
| uint16_t dimm0_address, |
| uint16_t dimm1_address) |
| { |
| uint8_t bEqual = 0; |
| int dimm0_value = spd_read_byte(dimm0_address, spd_byte_number); |
| int dimm1_value = spd_read_byte(dimm1_address, spd_byte_number); |
| |
| if ((dimm0_value >= 0) && (dimm1_value >= 0) |
| && (dimm0_value == dimm1_value)) |
| bEqual = 1; |
| |
| return bEqual; |
| } |
| #endif |
| |
| /** |
| * Scan for compatible DIMMs. |
| * |
| * The code in this module only supports dual-channel operation, so we test |
| * that compatible DIMMs are paired. |
| * |
| * @param ctrl PCI addresses of memory controller functions, and SMBus |
| * addresses of DIMM slots on the mainboard. |
| * @return A bitmask indicating which of the possible sockets for each channel |
| * was found to contain a compatible DIMM. |
| * Bit 0 corresponds to the closest socket for channel 0 |
| * Bit 1 to the next socket for channel 0 |
| * ... |
| * Bit MAX_DIMM_SOCKETS_PER_CHANNEL-1 to the last socket for channel 0 |
| * Bit MAX_DIMM_SOCKETS_PER_CHANNEL is the closest socket for channel 1 |
| * ... |
| * Bit 2*MAX_DIMM_SOCKETS_PER_CHANNEL-1 is the last socket for channel 1 |
| */ |
| static uint8_t spd_get_supported_dimms(const struct mem_controller *ctrl) |
| { |
| int i; |
| uint8_t dimm_mask = 0; |
| |
| // Have to increase size of dimm_mask if this assertion is violated |
| ASSERT(MAX_DIMM_SOCKETS_PER_CHANNEL <= 4); |
| |
| // Find DIMMs we can support on channel 0. |
| // Then see if the corresponding channel 1 DIMM has the same parameters, |
| // since we only support dual-channel. |
| |
| for (i = 0; i < MAX_DIMM_SOCKETS_PER_CHANNEL; i++) { |
| |
| uint16_t channel0_dimm = ctrl->channel0[i]; |
| uint16_t channel1_dimm = ctrl->channel1[i]; |
| uint8_t bDualChannel = 1; |
| #ifdef VALIDATE_DIMM_COMPATIBILITY |
| struct dimm_size page_size; |
| struct dimm_size sdram_width; |
| #endif |
| int spd_value; |
| |
| if (channel0_dimm == 0) |
| continue; // No such socket on this mainboard |
| |
| if (spd_read_byte(channel0_dimm, SPD_MEMORY_TYPE) != |
| SPD_MEMORY_TYPE_SDRAM_DDR) |
| continue; |
| |
| #ifdef VALIDATE_DIMM_COMPATIBILITY |
| if (spd_read_byte(channel0_dimm, SPD_MODULE_VOLTAGE) != |
| SPD_VOLTAGE_SSTL2) |
| continue; // Unsupported voltage |
| |
| // E7501 does not support unregistered DIMMs |
| spd_value = |
| spd_read_byte(channel0_dimm, SPD_MODULE_ATTRIBUTES); |
| if (!(spd_value & MODULE_REGISTERED) || (spd_value < 0)) |
| continue; |
| |
| // Must support burst = 4 for dual-channel operation on E7501 |
| // NOTE: for single-channel, burst = 8 is required |
| spd_value = |
| spd_read_byte(channel0_dimm, |
| SPD_SUPPORTED_BURST_LENGTHS); |
| if (!(spd_value & SPD_BURST_LENGTH_4) || (spd_value < 0)) |
| continue; |
| |
| page_size = sdram_spd_get_page_size(channel0_dimm); |
| sdram_width = sdram_spd_get_width(channel0_dimm); |
| |
| // Validate DIMM page size |
| // The E7501 only supports page sizes of 4, 8, 16, or 32 KB per channel |
| // NOTE: 4 KB = 32 Kb = 2^15 |
| // 32 KB = 262 Kb = 2^18 |
| |
| if ((page_size.side1 < 15) || (page_size.side1 > 18)) |
| continue; |
| |
| // If DIMM is double-sided, verify side2 page size |
| if (page_size.side2 != 0) { |
| if ((page_size.side2 < 15) |
| || (page_size.side2 > 18)) |
| continue; |
| } |
| // Validate SDRAM width |
| // The E7501 only supports x4 and x8 devices |
| |
| if ((sdram_width.side1 != 4) && (sdram_width.side1 != 8)) |
| continue; |
| |
| // If DIMM is double-sided, verify side2 width |
| if (sdram_width.side2 != 0) { |
| if ((sdram_width.side2 != 4) |
| && (sdram_width.side2 != 8)) |
| continue; |
| } |
| #endif |
| // Channel 0 DIMM looks compatible. |
| // Now see if it is paired with the proper DIMM on channel 1. |
| |
| ASSERT(channel1_dimm != 0); // No such socket on this mainboard?? |
| |
| // NOTE: unpopulated DIMMs cause read to fail |
| spd_value = |
| spd_read_byte(channel1_dimm, SPD_MODULE_ATTRIBUTES); |
| if (!(spd_value & MODULE_REGISTERED) || (spd_value < 0)) { |
| |
| printk(BIOS_DEBUG, "Skipping un-matched DIMMs - only dual-channel operation supported\n"); |
| continue; |
| } |
| #ifdef VALIDATE_DIMM_COMPATIBILITY |
| spd_value = |
| spd_read_byte(channel1_dimm, |
| SPD_SUPPORTED_BURST_LENGTHS); |
| if (!(spd_value & SPD_BURST_LENGTH_4) || (spd_value < 0)) |
| continue; |
| |
| int j; |
| for (j = 0; j < sizeof(dual_channel_parameters); ++j) { |
| if (!are_spd_values_equal |
| (dual_channel_parameters[j], channel0_dimm, |
| channel1_dimm)) { |
| |
| bDualChannel = 0; |
| break; |
| } |
| } |
| #endif /* VALIDATE_DIMM_COMPATIBILITY */ |
| |
| // Code around ROMCC bug in optimization of "if" statements |
| #ifdef ROMCC_IF_BUG_FIXED |
| if (bDualChannel) { |
| // Made it through all the checks, this DIMM pair is usable |
| dimm_mask |= ((1 << i) | (1 << (MAX_DIMM_SOCKETS_PER_CHANNEL + i))); |
| } else |
| printk(BIOS_DEBUG, "Skipping un-matched DIMMs - only dual-channel operation supported\n"); |
| #else |
| switch (bDualChannel) { |
| case 0: |
| printk(BIOS_DEBUG, "Skipping un-matched DIMMs - only dual-channel operation supported\n"); |
| break; |
| |
| default: |
| // Made it through all the checks, this DIMM pair is usable |
| dimm_mask |= (1 << i) | (1 << (MAX_DIMM_SOCKETS_PER_CHANNEL + i)); |
| break; |
| } |
| #endif |
| } |
| |
| return dimm_mask; |
| } |
| |
| /*----------------------------------------------------------------------------- |
| SDRAM configuration functions: |
| -----------------------------------------------------------------------------*/ |
| |
| /** |
| * Send the specified command to all DIMMs. |
| * |
| * @param command Specifies the command to be sent to the DIMMs. |
| * @param jedec_mode_bits For the MRS & EMRS commands, bits 0-12 contain the |
| * register value in JEDEC format. |
| */ |
| static void do_ram_command(uint8_t command, uint16_t jedec_mode_bits) |
| { |
| uint8_t dimm_start_64M_multiple; |
| uintptr_t dimm_start_address; |
| uint32_t dram_controller_mode; |
| uint8_t i; |
| |
| // Configure the RAM command |
| dram_controller_mode = pci_read_config32(MCHDEV, DRC); |
| dram_controller_mode &= 0xFFFFFF8F; |
| dram_controller_mode |= command; |
| pci_write_config32(MCHDEV, DRC, dram_controller_mode); |
| |
| // RAM_COMMAND_NORMAL is an exception. |
| // It affects only the memory controller and does not need to be "sent" to the DIMMs. |
| if (command == RAM_COMMAND_NORMAL) { |
| EXTRA_DELAY; |
| return; |
| } |
| |
| // NOTE: for mode select commands, some of the location address bits are part of the command |
| // Map JEDEC mode bits to E7505 |
| if (command == RAM_COMMAND_MRS) { |
| // Host address lines [25:18] map to DIMM address lines [7:0] |
| // Host address lines [17:16] map to DIMM address lines [9:8] |
| // Host address lines [15:4] map to DIMM address lines [11:0] |
| dimm_start_address = (jedec_mode_bits & 0x00ff) << 18; |
| dimm_start_address |= (jedec_mode_bits & 0x0300) << 8; |
| dimm_start_address |= (jedec_mode_bits & 0x0fff) << 4; |
| } else if (command == RAM_COMMAND_EMRS) { |
| // Host address lines [15:4] map to DIMM address lines [11:0] |
| dimm_start_address = (jedec_mode_bits << 4); |
| } else { |
| ASSERT(jedec_mode_bits == 0); |
| dimm_start_address = 0; |
| } |
| |
| // Send the command to all DIMMs by accessing a memory location within each |
| |
| dimm_start_64M_multiple = 0; |
| |
| /* FIXME: Only address the number of rows present in the system? |
| * Seems like rows 4-7 overlap with 0-3. |
| */ |
| for (i = 0; i < (MAX_NUM_CHANNELS * MAX_DIMM_SOCKETS_PER_CHANNEL); ++i) { |
| |
| uint8_t dimm_end_64M_multiple = pci_read_config8(MCHDEV, DRB_ROW_0 + i); |
| |
| if (dimm_end_64M_multiple > dimm_start_64M_multiple) { |
| dimm_start_address &= 0x3ffffff; |
| dimm_start_address |= dimm_start_64M_multiple << 26; |
| read32((void *)dimm_start_address); |
| // Set the start of the next DIMM |
| dimm_start_64M_multiple = dimm_end_64M_multiple; |
| } |
| } |
| EXTRA_DELAY; |
| } |
| |
| /** |
| * Set the mode register of all DIMMs. |
| * |
| * The proper CAS# latency setting is added to the mode bits specified |
| * by the caller. |
| * |
| * @param jedec_mode_bits For the MRS & EMRS commands, bits 0-12 contain the |
| * register value in JEDEC format. |
| */ |
| static void set_ram_mode(uint16_t jedec_mode_bits) |
| { |
| ASSERT(!(jedec_mode_bits & SDRAM_CAS_MASK)); |
| |
| uint32_t dram_cas_latency = |
| pci_read_config32(MCHDEV, DRT) & DRT_CAS_MASK; |
| |
| switch (dram_cas_latency) { |
| case DRT_CAS_2_5: |
| jedec_mode_bits |= SDRAM_CAS_2_5; |
| break; |
| |
| case DRT_CAS_2_0: |
| jedec_mode_bits |= SDRAM_CAS_2_0; |
| break; |
| |
| default: |
| BUG(); |
| break; |
| } |
| |
| do_ram_command(RAM_COMMAND_MRS, jedec_mode_bits); |
| } |
| |
| /*----------------------------------------------------------------------------- |
| DIMM-independant configuration functions: |
| -----------------------------------------------------------------------------*/ |
| |
| /** |
| * Configure the E7501's DRAM Row Boundary (DRB) registers for the memory |
| * present in the specified DIMM. |
| * |
| * @param dimm_log2_num_bits Specifies log2(number of bits) for each side of |
| * the DIMM. |
| * @param total_dram_64M_multiple Total DRAM in the system (as a multiple of |
| * 64 MB) for DIMMs < dimm_index. |
| * @param dimm_index Which DIMM pair is being processed |
| * (0..MAX_DIMM_SOCKETS_PER_CHANNEL). |
| * @return New multiple of 64 MB total DRAM in the system. |
| */ |
| static uint8_t configure_dimm_row_boundaries(struct dimm_size dimm_log2_num_bits, uint8_t total_dram_64M_multiple, unsigned dimm_index) |
| { |
| int i; |
| |
| ASSERT(dimm_index < MAX_DIMM_SOCKETS_PER_CHANNEL); |
| |
| // DIMM sides must be at least 32 MB |
| ASSERT(dimm_log2_num_bits.side1 >= 28); |
| ASSERT((dimm_log2_num_bits.side2 == 0) |
| || (dimm_log2_num_bits.side2 >= 28)); |
| |
| // In dual-channel mode, we are called only once for each pair of DIMMs. |
| // Each time we process twice the capacity of a single DIMM. |
| |
| // Convert single DIMM capacity to paired DIMM capacity |
| // (multiply by two ==> add 1 to log2) |
| dimm_log2_num_bits.side1++; |
| if (dimm_log2_num_bits.side2 > 0) |
| dimm_log2_num_bits.side2++; |
| |
| // Add the capacity of side 1 this DIMM pair (as a multiple of 64 MB) |
| // to the total capacity of the system |
| // NOTE: 64 MB == 512 Mb, and log2(512 Mb) == 29 |
| |
| total_dram_64M_multiple += (1 << (dimm_log2_num_bits.side1 - 29)); |
| |
| // Configure the boundary address for the row on side 1 |
| pci_write_config8(MCHDEV, DRB_ROW_0 + (dimm_index << 1), |
| total_dram_64M_multiple); |
| |
| // If the DIMMs are double-sided, add the capacity of side 2 this DIMM pair |
| // (as a multiple of 64 MB) to the total capacity of the system |
| if (dimm_log2_num_bits.side2 >= 29) |
| total_dram_64M_multiple += |
| (1 << (dimm_log2_num_bits.side2 - 29)); |
| |
| // Configure the boundary address for the row (if any) on side 2 |
| pci_write_config8(MCHDEV, DRB_ROW_1 + (dimm_index << 1), |
| total_dram_64M_multiple); |
| |
| // Update boundaries for rows subsequent to these. |
| // These settings will be overridden by a subsequent call if a populated physical slot exists |
| |
| for (i = dimm_index + 1; i < MAX_DIMM_SOCKETS_PER_CHANNEL; i++) { |
| pci_write_config8(MCHDEV, DRB_ROW_0 + (i << 1), |
| total_dram_64M_multiple); |
| pci_write_config8(MCHDEV, DRB_ROW_1 + (i << 1), |
| total_dram_64M_multiple); |
| } |
| |
| return total_dram_64M_multiple; |
| } |
| |
| /** |
| * Set the E7501's DRAM row boundary addresses & its Top Of Low Memory (TOLM). |
| * |
| * If necessary, set up a remap window so we don't waste DRAM that ordinarily |
| * would lie behind addresses reserved for memory-mapped I/O. |
| * |
| * @param ctrl PCI addresses of memory controller functions, and SMBus |
| * addresses of DIMM slots on the mainboard. |
| * @param dimm_mask Bitmask of populated DIMMs, see spd_get_supported_dimms(). |
| */ |
| static void configure_e7501_ram_addresses(const struct mem_controller |
| *ctrl, uint8_t dimm_mask) |
| { |
| int i; |
| uint8_t total_dram_64M_multiple = 0; |
| |
| // Configure the E7501's DRAM row boundaries |
| // Start by zeroing out the temporary initial configuration |
| pci_write_config32(MCHDEV, DRB_ROW_0, 0); |
| pci_write_config32(MCHDEV, DRB_ROW_4, 0); |
| |
| for (i = 0; i < MAX_DIMM_SOCKETS_PER_CHANNEL; i++) { |
| |
| uint16_t dimm_socket_address = ctrl->channel0[i]; |
| struct dimm_size sz; |
| |
| if (!(dimm_mask & (1 << i))) |
| continue; // This DIMM not present |
| |
| sz = spd_get_dimm_size(dimm_socket_address); |
| |
| RAM_DEBUG_MESSAGE("dimm size ="); |
| RAM_DEBUG_HEX32((u32)sz.side1); |
| RAM_DEBUG_MESSAGE(" "); |
| RAM_DEBUG_HEX32((u32)sz.side2); |
| RAM_DEBUG_MESSAGE("\n"); |
| |
| if (sz.side1 == 0) |
| die("Bad SPD value\n"); |
| |
| total_dram_64M_multiple = |
| configure_dimm_row_boundaries(sz, total_dram_64M_multiple, i); |
| } |
| |
| // Configure the Top Of Low Memory (TOLM) in the E7501 |
| // This address must be a multiple of 128 MB that is less than 4 GB. |
| // NOTE: 16-bit wide TOLM register stores only the highest 5 bits of a 32-bit address |
| // in the highest 5 bits. |
| |
| // We set TOLM to the smaller of 0xC0000000 (3 GB) or the total DRAM in the system. |
| // This reserves addresses from 0xC0000000 - 0xFFFFFFFF for non-DRAM purposes |
| // such as flash and memory-mapped I/O. |
| |
| // If there is more than 3 GB of DRAM, we define a remap window which |
| // makes the DRAM "behind" the reserved region available above the top of physical |
| // memory. |
| |
| // NOTE: 0xC0000000 / (64 MB) == 0x30 |
| |
| if (total_dram_64M_multiple <= 0x30) { |
| |
| // <= 3 GB total RAM |
| |
| /* I should really adjust all of this in C after I have resources |
| * to all of the pci devices. |
| */ |
| |
| // Round up to 128MB granularity |
| // SJM: Is "missing" 64 MB of memory a potential issue? Should this round down? |
| |
| uint8_t total_dram_128M_multiple = |
| (total_dram_64M_multiple + 1) >> 1; |
| |
| // Convert to high 16 bits of address |
| uint16_t top_of_low_memory = |
| total_dram_128M_multiple << 11; |
| |
| pci_write_config16(MCHDEV, TOLM, |
| top_of_low_memory); |
| |
| } else { |
| |
| // > 3 GB total RAM |
| |
| // Set defaults for > 4 GB DRAM, i.e. remap a 1 GB (= 0x10 * 64 MB) range of memory |
| uint16_t remap_base = total_dram_64M_multiple; // A[25:0] == 0 |
| uint16_t remap_limit = total_dram_64M_multiple + 0x10 - 1; // A[25:0] == 0xF |
| |
| // Put TOLM at 3 GB |
| |
| pci_write_config16(MCHDEV, TOLM, 0xc000); |
| |
| // Define a remap window to make the RAM that would appear from 3 GB - 4 GB |
| // visible just beyond 4 GB or the end of physical memory, whichever is larger |
| // NOTE: 16-bit wide REMAP registers store only the highest 10 bits of a 36-bit address, |
| // (i.e. a multiple of 64 MB) in the lowest 10 bits. |
| // NOTE: 0x100000000 / (64 MB) == 0x40 |
| |
| if (total_dram_64M_multiple < 0x40) { |
| remap_base = 0x40; // 0x100000000 |
| remap_limit = |
| 0x40 + (total_dram_64M_multiple - 0x30) - 1; |
| } |
| |
| pci_write_config16(MCHDEV, REMAPBASE, |
| remap_base); |
| pci_write_config16(MCHDEV, REMAPLIMIT, |
| remap_limit); |
| } |
| } |
| |
| /** |
| * Execute ECC full-speed scrub once and leave scrubber disabled. |
| * |
| * NOTE: All cache and stack is lost during ECC scrub loop. |
| */ |
| static inline void __attribute__((always_inline)) |
| initialize_ecc(unsigned long ret_addr, unsigned long ret_addr2) |
| { |
| uint16_t scrubbed = pci_read_config16(MCHDEV, MCHCFGNS) & 0x08; |
| |
| if (!scrubbed) { |
| RAM_DEBUG_MESSAGE("Initializing ECC state...\n"); |
| |
| /* ECC scrub flushes cache-lines and stack, need to |
| * store return address from romstage.c:main(). |
| */ |
| asm volatile( |
| "movd %0, %%xmm0;" |
| "movd (%0), %%xmm1;" |
| "movd %1, %%xmm2;" |
| "movd (%1), %%xmm3;" |
| :: "r" (ret_addr), "r" (ret_addr2) : |
| ); |
| |
| /* NOTE: All cache is lost during this loop. |
| * Make sure PCI access does not use stack. |
| */ |
| |
| pci_write_config16(MCHDEV, MCHCFGNS, 0x01); |
| do { |
| scrubbed = pci_read_config16(MCHDEV, MCHCFGNS); |
| } while (! (scrubbed & 0x08)); |
| pci_write_config16(MCHDEV, MCHCFGNS, (scrubbed & ~0x07) | 0x04); |
| |
| /* Some problem remains with XIP cache from ROM, so for |
| * now, I disable XIP and also invalidate cache (again) |
| * before the remaining small portion of romstage. |
| * |
| * Adding NOPs here has unexpected results, making |
| * the first do_printk()/vtxprintf() after ECC scrub |
| * fail midway. Sometimes vtxprintf() dumps strings |
| * completely but with every 4th (fourth) character as "/". |
| * |
| * An inlined dump to console of the same string, |
| * before vtxprintf() call, is successful. So the |
| * source string should be completely in cache already. |
| * |
| * I need to review this again with CPU microcode |
| * update applied pre-CAR. |
| */ |
| |
| /* Disable and invalidate all cache. */ |
| msr_t xip_mtrr = rdmsr(MTRR_PHYS_MASK(1)); |
| xip_mtrr.lo &= ~MTRR_PHYS_MASK_VALID; |
| invd(); |
| wrmsr(MTRR_PHYS_MASK(1), xip_mtrr); |
| invd(); |
| |
| RAM_DEBUG_MESSAGE("ECC state initialized.\n"); |
| |
| /* Recover IP for return from main. */ |
| asm volatile( |
| "movd %%xmm0, %%edi;" |
| "movd %%xmm1, (%%edi);" |
| "movd %%xmm2, %%edi;" |
| "movd %%xmm3, (%%edi);" |
| ::: "edi" |
| ); |
| |
| #if CONFIG_DEBUG_RAM_SETUP |
| unsigned int a1, a2; |
| asm volatile("movd %%xmm2, %%eax;" : "=a" (a1) ::); |
| asm volatile("movd %%xmm3, %%eax;" : "=a" (a2) ::); |
| printk(BIOS_DEBUG, "return EIP @ %x = %x\n", a1, a2); |
| asm volatile("movd %%xmm0, %%eax;" : "=a" (a1) ::); |
| asm volatile("movd %%xmm1, %%eax;" : "=a" (a2) ::); |
| printk(BIOS_DEBUG, "return EIP @ %x = %x\n", a1, a2); |
| #endif |
| } |
| |
| /* Clear the ECC error bits. */ |
| pci_write_config8(RASDEV, DRAM_FERR, 0x03); |
| pci_write_config8(RASDEV, DRAM_NERR, 0x03); |
| |
| /* Clear DRAM Interface error bits. */ |
| pci_write_config32(RASDEV, FERR_GLOBAL, 1 << 18); |
| pci_write_config32(RASDEV, NERR_GLOBAL, 1 << 18); |
| } |
| |
| /** |
| * Program the DRAM Timing register (DRT) of the E7501 (except for CAS# |
| * latency, which is assumed to have been programmed already), based on the |
| * parameters of the various installed DIMMs. |
| * |
| * @param ctrl PCI addresses of memory controller functions, and SMBus |
| * addresses of DIMM slots on the mainboard. |
| * @param dimm_mask Bitmask of populated DIMMs, see spd_get_supported_dimms(). |
| */ |
| static void configure_e7501_dram_timing(const struct mem_controller *ctrl, |
| uint8_t dimm_mask) |
| { |
| int i; |
| uint32_t dram_timing; |
| int value; |
| uint8_t slowest_row_precharge = 0; |
| uint8_t slowest_ras_cas_delay = 0; |
| uint8_t slowest_active_to_precharge_delay = 0; |
| uint32_t current_cas_latency = |
| pci_read_config32(MCHDEV, DRT) & DRT_CAS_MASK; |
| |
| // CAS# latency must be programmed beforehand |
| ASSERT((current_cas_latency == DRT_CAS_2_0) |
| || (current_cas_latency == DRT_CAS_2_5)); |
| |
| // Each timing parameter is determined by the slowest DIMM |
| |
| for (i = 0; i < MAX_DIMM_SOCKETS; i++) { |
| uint16_t dimm_socket_address; |
| |
| if (!(dimm_mask & (1 << i))) |
| continue; // This DIMM not present |
| |
| if (i < MAX_DIMM_SOCKETS_PER_CHANNEL) |
| dimm_socket_address = ctrl->channel0[i]; |
| else |
| dimm_socket_address = |
| ctrl->channel1[i - MAX_DIMM_SOCKETS_PER_CHANNEL]; |
| |
| value = |
| spd_read_byte(dimm_socket_address, |
| SPD_MIN_ROW_PRECHARGE_TIME); |
| if (value < 0) |
| goto hw_err; |
| if (value > slowest_row_precharge) |
| slowest_row_precharge = value; |
| |
| value = |
| spd_read_byte(dimm_socket_address, |
| SPD_MIN_RAS_TO_CAS_DELAY); |
| if (value < 0) |
| goto hw_err; |
| if (value > slowest_ras_cas_delay) |
| slowest_ras_cas_delay = value; |
| |
| value = |
| spd_read_byte(dimm_socket_address, |
| SPD_MIN_ACTIVE_TO_PRECHARGE_DELAY); |
| if (value < 0) |
| goto hw_err; |
| if (value > slowest_active_to_precharge_delay) |
| slowest_active_to_precharge_delay = value; |
| } |
| |
| // NOTE for timing parameters: |
| // At 133 MHz, 1 clock == 7.52 ns |
| |
| /* Read the initial state */ |
| dram_timing = pci_read_config32(MCHDEV, DRT); |
| |
| /* Trp */ |
| |
| // E7501 supports only 2 or 3 clocks for tRP |
| if (slowest_row_precharge > ((22 << 2) | (2 << 0))) |
| die("unsupported DIMM tRP"); // > 22.5 ns: 4 or more clocks |
| else if (slowest_row_precharge > (15 << 2)) |
| dram_timing &= ~(1 << 0); // > 15.0 ns: 3 clocks |
| else |
| dram_timing |= (1 << 0); // <= 15.0 ns: 2 clocks |
| |
| /* Trcd */ |
| |
| // E7501 supports only 2 or 3 clocks for tRCD |
| // Use the same value for both read & write |
| dram_timing &= ~((1 << 3) | (3 << 1)); |
| if (slowest_ras_cas_delay > ((22 << 2) | (2 << 0))) |
| die("unsupported DIMM tRCD"); // > 22.5 ns: 4 or more clocks |
| else if (slowest_ras_cas_delay > (15 << 2)) |
| dram_timing |= (2 << 1); // > 15.0 ns: 3 clocks |
| else |
| dram_timing |= ((1 << 3) | (3 << 1)); // <= 15.0 ns: 2 clocks |
| |
| /* Tras */ |
| |
| // E7501 supports only 5, 6, or 7 clocks for tRAS |
| // 5 clocks ~= 37.6 ns, 6 clocks ~= 45.1 ns, 7 clocks ~= 52.6 ns |
| dram_timing &= ~(3 << 9); |
| |
| if (slowest_active_to_precharge_delay > 52) |
| die("unsupported DIMM tRAS"); // > 52 ns: 8 or more clocks |
| else if (slowest_active_to_precharge_delay > 45) |
| dram_timing |= (0 << 9); // 46-52 ns: 7 clocks |
| else if (slowest_active_to_precharge_delay > 37) |
| dram_timing |= (1 << 9); // 38-45 ns: 6 clocks |
| else |
| dram_timing |= (2 << 9); // < 38 ns: 5 clocks |
| |
| /* Trd */ |
| |
| /* Set to a 7 clock read delay. This is for 133MHz |
| * with a CAS latency of 2.5 if 2.0 a 6 clock |
| * delay is good */ |
| |
| dram_timing &= ~(7 << 24); // 7 clocks |
| if (current_cas_latency == DRT_CAS_2_0) |
| dram_timing |= (1 << 24); // 6 clocks |
| |
| /* |
| * Back to Back Read-Write Turn Around |
| */ |
| /* Set to a 5 clock back to back read to write turn around. |
| * 4 is a good delay if the CAS latency is 2.0 */ |
| |
| dram_timing &= ~(1 << 28); // 5 clocks |
| if (current_cas_latency == DRT_CAS_2_0) |
| dram_timing |= (1 << 28); // 4 clocks |
| |
| pci_write_config32(MCHDEV, DRT, dram_timing); |
| |
| return; |
| |
| hw_err: |
| die(SPD_ERROR); |
| } |
| |
| /** |
| * Determine the shortest CAS# latency that the E7501 and all DIMMs have in |
| * common, and program the E7501 to use it. |
| * |
| * @param ctrl PCI addresses of memory controller functions, and SMBus |
| * addresses of DIMM slots on the mainboard. |
| * @param dimm_mask Bitmask of populated DIMMs, spd_get_supported_dimms(). |
| */ |
| static void configure_e7501_cas_latency(const struct mem_controller *ctrl, |
| uint8_t dimm_mask) |
| { |
| int i; |
| int value; |
| uint32_t dram_timing; |
| uint16_t dram_read_timing; |
| uint32_t dword; |
| |
| // CAS# latency bitmasks in SPD_ACCEPTABLE_CAS_LATENCIES format |
| // NOTE: E7501 supports only 2.0 and 2.5 |
| uint32_t system_compatible_cas_latencies = |
| SPD_CAS_LATENCY_2_0 | SPD_CAS_LATENCY_2_5; |
| uint32_t current_cas_latency; |
| uint32_t dimm_compatible_cas_latencies; |
| |
| for (i = 0; i < MAX_DIMM_SOCKETS; i++) { |
| |
| uint16_t dimm_socket_address; |
| |
| if (!(dimm_mask & (1 << i))) |
| continue; // This DIMM not usable |
| |
| if (i < MAX_DIMM_SOCKETS_PER_CHANNEL) |
| dimm_socket_address = ctrl->channel0[i]; |
| else |
| dimm_socket_address = |
| ctrl->channel1[i - MAX_DIMM_SOCKETS_PER_CHANNEL]; |
| |
| value = |
| spd_read_byte(dimm_socket_address, |
| SPD_ACCEPTABLE_CAS_LATENCIES); |
| if (value < 0) |
| goto hw_err; |
| |
| dimm_compatible_cas_latencies = value & 0x7f; // Start with all supported by DIMM |
| current_cas_latency = 1 << log2(dimm_compatible_cas_latencies); // Max supported by DIMM |
| |
| // Can we support the highest CAS# latency? |
| |
| value = |
| spd_read_byte(dimm_socket_address, |
| SPD_MIN_CYCLE_TIME_AT_CAS_MAX); |
| if (value < 0) |
| goto hw_err; |
| |
| // NOTE: At 133 MHz, 1 clock == 7.52 ns |
| if (value > 0x75) { |
| // Our bus is too fast for this CAS# latency |
| // Remove it from the bitmask of those supported by the DIMM that are compatible |
| dimm_compatible_cas_latencies &= ~current_cas_latency; |
| } |
| // Can we support the next-highest CAS# latency (max - 0.5)? |
| |
| current_cas_latency >>= 1; |
| if (current_cas_latency != 0) { |
| value = |
| spd_read_byte(dimm_socket_address, |
| SPD_SDRAM_CYCLE_TIME_2ND); |
| if (value < 0) |
| goto hw_err; |
| if (value > 0x75) |
| dimm_compatible_cas_latencies &= |
| ~current_cas_latency; |
| } |
| // Can we support the next-highest CAS# latency (max - 1.0)? |
| current_cas_latency >>= 1; |
| if (current_cas_latency != 0) { |
| value = |
| spd_read_byte(dimm_socket_address, |
| SPD_SDRAM_CYCLE_TIME_3RD); |
| if (value < 0) |
| goto hw_err; |
| if (value > 0x75) |
| dimm_compatible_cas_latencies &= |
| ~current_cas_latency; |
| } |
| // Restrict the system to CAS# latencies compatible with this DIMM |
| system_compatible_cas_latencies &= |
| dimm_compatible_cas_latencies; |
| |
| /* go to the next DIMM */ |
| } |
| |
| /* After all of the arduous calculation setup with the fastest |
| * cas latency I can use. |
| */ |
| |
| dram_timing = pci_read_config32(MCHDEV, DRT); |
| dram_timing &= ~(DRT_CAS_MASK); |
| |
| dram_read_timing = |
| pci_read_config16(MCHDEV, DRDCTL); |
| dram_read_timing &= 0xF000; |
| |
| if (system_compatible_cas_latencies & SPD_CAS_LATENCY_2_0) { |
| dram_timing |= DRT_CAS_2_0; |
| dram_read_timing |= 0x0222; |
| } else if (system_compatible_cas_latencies & SPD_CAS_LATENCY_2_5) { |
| |
| uint32_t dram_row_attributes = |
| pci_read_config32(MCHDEV, DRA); |
| |
| dram_timing |= DRT_CAS_2_5; |
| |
| // At CAS# 2.5, DRAM Read Timing (if that's what it its) appears to need a slightly |
| // different value if all DIMM slots are populated |
| |
| if ((dram_row_attributes & 0xff) |
| && (dram_row_attributes & 0xff00) |
| && (dram_row_attributes & 0xff0000) |
| && (dram_row_attributes & 0xff000000)) { |
| |
| // All slots populated |
| dram_read_timing |= 0x0882; |
| } else { |
| // Some unpopulated slots |
| dram_read_timing |= 0x0662; |
| } |
| } else |
| die("No CAS# latencies compatible with all DIMMs!!\n"); |
| |
| pci_write_config32(MCHDEV, DRT, dram_timing); |
| |
| /* set master DLL reset */ |
| dword = pci_read_config32(MCHDEV, 0x88); |
| dword |= (1 << 26); |
| pci_write_config32(MCHDEV, 0x88, dword); |
| /* patch try register 88 is undocumented tnz */ |
| dword &= 0x0ca17fff; |
| dword |= 0xd14a5000; |
| pci_write_config32(MCHDEV, 0x88, dword); |
| |
| pci_write_config16(MCHDEV, DRDCTL, |
| dram_read_timing); |
| |
| /* clear master DLL reset */ |
| dword = pci_read_config32(MCHDEV, 0x88); |
| dword &= ~(1 << 26); |
| pci_write_config32(MCHDEV, 0x88, dword); |
| |
| return; |
| |
| hw_err: |
| die(SPD_ERROR); |
| } |
| |
| /** |
| * Configure the refresh interval so that we refresh no more often than |
| * required by the "most needy" DIMM. Also disable ECC if any of the DIMMs |
| * don't support it. |
| * |
| * @param ctrl PCI addresses of memory controller functions, and SMBus |
| * addresses of DIMM slots on the mainboard. |
| * @param dimm_mask Bitmask of populated DIMMs, spd_get_supported_dimms(). |
| */ |
| static void configure_e7501_dram_controller_mode(const struct |
| mem_controller *ctrl, |
| uint8_t dimm_mask) |
| { |
| int i; |
| |
| // Initial settings |
| uint32_t controller_mode = |
| pci_read_config32(MCHDEV, DRC); |
| uint32_t system_refresh_mode = (controller_mode >> 8) & 7; |
| |
| // Code below assumes that most aggressive settings are in |
| // force when we are called, either via E7501 reset defaults |
| // or by sdram_set_registers(): |
| // - ECC enabled |
| // - No refresh |
| |
| ASSERT((controller_mode & (3 << 20)) == (2 << 20)); // ECC |
| ASSERT(!(controller_mode & (7 << 8))); // Refresh |
| |
| /* Walk through _all_ dimms and find the least-common denominator for: |
| * - ECC support |
| * - refresh rates |
| */ |
| |
| for (i = 0; i < MAX_DIMM_SOCKETS; i++) { |
| |
| uint32_t dimm_refresh_mode; |
| int value; |
| uint16_t dimm_socket_address; |
| |
| if (!(dimm_mask & (1 << i))) { |
| continue; // This DIMM not usable |
| } |
| |
| if (i < MAX_DIMM_SOCKETS_PER_CHANNEL) |
| dimm_socket_address = ctrl->channel0[i]; |
| else |
| dimm_socket_address = |
| ctrl->channel1[i - |
| MAX_DIMM_SOCKETS_PER_CHANNEL]; |
| |
| // Disable ECC mode if any one of the DIMMs does not support ECC |
| // SJM: Should we just die here? E7501 datasheet says non-ECC DIMMs aren't supported. |
| |
| value = |
| spd_read_byte(dimm_socket_address, |
| SPD_DIMM_CONFIG_TYPE); |
| die_on_spd_error(value); |
| if (value != ERROR_SCHEME_ECC) { |
| controller_mode &= ~(3 << 20); |
| } |
| |
| value = spd_read_byte(dimm_socket_address, SPD_REFRESH); |
| die_on_spd_error(value); |
| value &= 0x7f; // Mask off self-refresh bit |
| if (value > MAX_SPD_REFRESH_RATE) { |
| printk(BIOS_ERR, "unsupported refresh rate\n"); |
| continue; |
| } |
| // Get the appropriate E7501 refresh mode for this DIMM |
| dimm_refresh_mode = refresh_rate_map[value]; |
| if (dimm_refresh_mode > 7) { |
| printk(BIOS_ERR, "unsupported refresh rate\n"); |
| continue; |
| } |
| // If this DIMM requires more frequent refresh than others, |
| // update the system setting |
| if (refresh_frequency[dimm_refresh_mode] > |
| refresh_frequency[system_refresh_mode]) |
| system_refresh_mode = dimm_refresh_mode; |
| |
| #ifdef SUSPICIOUS_LOOKING_CODE |
| // SJM NOTE: This code doesn't look right. SPD values are an order of magnitude smaller |
| // than the clock period of the memory controller. Also, no other northbridge |
| // looks at SPD_CMD_SIGNAL_INPUT_HOLD_TIME. |
| |
| // Switch to 2 clocks for address/command if required by any one of the DIMMs |
| // NOTE: At 133 MHz, 1 clock == 7.52 ns |
| value = |
| spd_read_byte(dimm_socket_address, |
| SPD_CMD_SIGNAL_INPUT_HOLD_TIME); |
| die_on_spd_error(value); |
| if (value >= 0xa0) { /* At 133MHz this constant should be 0x75 */ |
| controller_mode &= ~(1 << 16); /* Use two clock cyles instead of one */ |
| } |
| #endif |
| |
| /* go to the next DIMM */ |
| } |
| |
| controller_mode |= (system_refresh_mode << 8); |
| |
| // Configure the E7501 |
| pci_write_config32(MCHDEV, DRC, controller_mode); |
| } |
| |
| /** |
| * Configure the E7501's DRAM Row Attributes (DRA) registers based on DIMM |
| * parameters read via SPD. This tells the controller the width of the SDRAM |
| * chips on each DIMM side (x4 or x8) and the page size of each DIMM side |
| * (4, 8, 16, or 32 KB). |
| * |
| * @param ctrl PCI addresses of memory controller functions, and SMBus |
| * addresses of DIMM slots on the mainboard. |
| * @param dimm_mask Bitmask of populated DIMMs, spd_get_supported_dimms(). |
| */ |
| static void configure_e7501_row_attributes(const struct mem_controller |
| *ctrl, uint8_t dimm_mask) |
| { |
| int i; |
| uint32_t row_attributes = 0; |
| |
| for (i = 0; i < MAX_DIMM_SOCKETS_PER_CHANNEL; i++) { |
| |
| uint16_t dimm_socket_address = ctrl->channel0[i]; |
| struct dimm_size page_size; |
| struct dimm_size sdram_width; |
| |
| if (!(dimm_mask & (1 << i))) |
| continue; // This DIMM not usable |
| |
| // Get the relevant parameters via SPD |
| page_size = sdram_spd_get_page_size(dimm_socket_address); |
| sdram_width = sdram_spd_get_width(dimm_socket_address); |
| |
| // Update the DRAM Row Attributes. |
| // Page size is encoded as log2(page size in bits) - log2(8 Kb) |
| // NOTE: 8 Kb = 2^13 |
| row_attributes |= (page_size.side1 - 13) << (i << 3); // Side 1 of each DIMM is an EVEN row |
| |
| if (sdram_width.side2 > 0) |
| row_attributes |= (page_size.side2 - 13) << ((i << 3) + 4); // Side 2 is ODD |
| |
| // Set x4 flags if appropriate |
| if (sdram_width.side1 == 4) { |
| row_attributes |= 0x08 << (i << 3); |
| } |
| |
| if (sdram_width.side2 == 4) { |
| row_attributes |= 0x08 << ((i << 3) + 4); |
| } |
| |
| /* go to the next DIMM */ |
| } |
| |
| /* Write the new row attributes register */ |
| pci_write_config32(MCHDEV, DRA, row_attributes); |
| } |
| |
| /* |
| * Enable clock signals for populated DIMM sockets and disable them for |
| * unpopulated sockets (to reduce EMI). |
| * |
| * @param dimm_mask Bitmask of populated DIMMs, see spd_get_supported_dimms(). |
| */ |
| static void enable_e7501_clocks(uint8_t dimm_mask) |
| { |
| int i; |
| uint8_t clock_disable = pci_read_config8(MCHDEV, CKDIS); |
| |
| pci_write_config8(MCHDEV, 0x8e, 0xb0); |
| |
| for (i = 0; i < MAX_DIMM_SOCKETS_PER_CHANNEL; i++) { |
| |
| uint8_t socket_mask = 1 << i; |
| |
| if (dimm_mask & socket_mask) |
| clock_disable &= ~socket_mask; // DIMM present, enable clock |
| else |
| clock_disable |= socket_mask; // DIMM absent, disable clock |
| } |
| |
| pci_write_config8(MCHDEV, CKDIS, clock_disable); |
| } |
| |
| /* DIMM-dedependent configuration functions */ |
| |
| /** |
| * DDR Receive FIFO RE-Sync (?) |
| */ |
| static void RAM_RESET_DDR_PTR(void) |
| { |
| uint8_t byte; |
| byte = pci_read_config8(MCHDEV, 0x88); |
| byte |= (1 << 4); |
| pci_write_config8(MCHDEV, 0x88, byte); |
| |
| byte = pci_read_config8(MCHDEV, 0x88); |
| byte &= ~(1 << 4); |
| pci_write_config8(MCHDEV, 0x88, byte); |
| } |
| |
| /** |
| * Copy 64 bytes from one location to another. |
| * |
| * @param src_addr TODO |
| * @param dst_addr TODO |
| */ |
| static void write_8dwords(const uint32_t *src_addr, u8 *dst_addr) |
| { |
| int i; |
| for (i = 0; i < 8; i++) { |
| write32(dst_addr, *src_addr); |
| src_addr++; |
| dst_addr += sizeof(uint32_t); |
| } |
| } |
| |
| /** |
| * Set the E7501's (undocumented) RCOMP registers. |
| * |
| * Per the 855PM datasheet and IXP2800 HW Initialization Reference Manual, |
| * RCOMP registers appear to affect drive strength, pullup/pulldown offset, |
| * and slew rate of various signal groups. |
| * |
| * Comments below are conjecture based on apparent similarity between the |
| * E7501 and these two chips. |
| */ |
| static void rcomp_copy_registers(void) |
| { |
| uint32_t dword; |
| uint8_t strength_control; |
| |
| RAM_DEBUG_MESSAGE("Setting RCOMP registers.\n"); |
| |
| /* Begin to write the RCOMP registers */ |
| write8(RCOMP_MMIO + 0x2c, 0x0); |
| |
| // Set CMD and DQ/DQS strength to 2x (?) |
| strength_control = read8(RCOMP_MMIO + DQCMDSTR) & 0x88; |
| strength_control |= 0x40; |
| write8(RCOMP_MMIO + DQCMDSTR, strength_control); |
| write_8dwords(slew_2x, RCOMP_MMIO + 0x80); |
| write16(RCOMP_MMIO + 0x42, 0); |
| |
| // Set CMD and DQ/DQS strength to 2x (?) |
| strength_control = read8(RCOMP_MMIO + DQCMDSTR) & 0xF8; |
| strength_control |= 0x04; |
| write8(RCOMP_MMIO + DQCMDSTR, strength_control); |
| write_8dwords(slew_2x, RCOMP_MMIO + 0x60); |
| write16(RCOMP_MMIO + 0x40, 0); |
| |
| // Set RCVEnOut# strength to 2x (?) |
| strength_control = read8(RCOMP_MMIO + RCVENSTR) & 0xF8; |
| strength_control |= 0x04; |
| write8(RCOMP_MMIO + RCVENSTR, strength_control); |
| write_8dwords(slew_2x, RCOMP_MMIO + 0x1c0); |
| write16(RCOMP_MMIO + 0x50, 0); |
| |
| // Set CS# strength for x4 SDRAM to 2x (?) |
| strength_control = read8(RCOMP_MMIO + CSBSTR) & 0x88; |
| strength_control |= 0x04; |
| write8(RCOMP_MMIO + CSBSTR, strength_control); |
| write_8dwords(slew_2x, RCOMP_MMIO + 0x140); |
| write16(RCOMP_MMIO + 0x48, 0); |
| |
| // Set CS# strength for x4 SDRAM to 2x (?) |
| strength_control = read8(RCOMP_MMIO + CSBSTR) & 0x8F; |
| strength_control |= 0x40; |
| write8(RCOMP_MMIO + CSBSTR, strength_control); |
| write_8dwords(slew_2x, RCOMP_MMIO + 0x160); |
| write16(RCOMP_MMIO + 0x4a, 0); |
| |
| // Set CKE strength for x4 SDRAM to 2x (?) |
| strength_control = read8(RCOMP_MMIO + CKESTR) & 0x88; |
| strength_control |= 0x04; |
| write8(RCOMP_MMIO + CKESTR, strength_control); |
| write_8dwords(slew_2x, RCOMP_MMIO + 0xa0); |
| write16(RCOMP_MMIO + 0x44, 0); |
| |
| // Set CKE strength for x4 SDRAM to 2x (?) |
| strength_control = read8(RCOMP_MMIO + CKESTR) & 0x8F; |
| strength_control |= 0x40; |
| write8(RCOMP_MMIO + CKESTR, strength_control); |
| write_8dwords(slew_2x, RCOMP_MMIO + 0xc0); |
| write16(RCOMP_MMIO + 0x46, 0); |
| |
| // Set CK strength for x4 SDRAM to 1x (?) |
| strength_control = read8(RCOMP_MMIO + CKSTR) & 0x88; |
| strength_control |= 0x01; |
| write8(RCOMP_MMIO + CKSTR, strength_control); |
| write_8dwords(pull_updown_offset_table, RCOMP_MMIO + 0x180); |
| write16(RCOMP_MMIO + 0x4c, 0); |
| |
| // Set CK strength for x4 SDRAM to 1x (?) |
| strength_control = read8(RCOMP_MMIO + CKSTR) & 0x8F; |
| strength_control |= 0x10; |
| write8(RCOMP_MMIO + CKSTR, strength_control); |
| write_8dwords(pull_updown_offset_table, RCOMP_MMIO + 0x1a0); |
| write16(RCOMP_MMIO + 0x4e, 0); |
| |
| dword = read32(RCOMP_MMIO + 0x400); |
| dword &= 0x7f7fffff; |
| write32(RCOMP_MMIO + 0x400, dword); |
| |
| dword = read32(RCOMP_MMIO + 0x408); |
| dword &= 0x7f7fffff; |
| write32(RCOMP_MMIO + 0x408, dword); |
| } |
| |
| static void ram_set_rcomp_regs(void) |
| { |
| /* Set the RCOMP MMIO base address */ |
| mchtest_control(RCOMP_BAR_ENABLE); |
| pci_write_config32(MCHDEV, SMRBASE, (uintptr_t)RCOMP_MMIO); |
| |
| /* Block RCOMP updates while we configure the registers */ |
| rcomp_smr_control(RCOMP_HOLD); |
| rcomp_copy_registers(); |
| d060_control(D060_CMD_0); |
| mchtest_control(MCHTST_CMD_0); |
| |
| uint8_t revision = pci_read_config8(MCHDEV, 0x08); |
| if (revision >= 3) { |
| rcomp_smr_control(RCOMP_SMR_00); |
| rcomp_smr_control(RCOMP_SMR_01); |
| } |
| rcomp_smr_control(RCOMP_RELEASE); |
| |
| /* Wait 40 usec */ |
| SLOW_DOWN_IO; |
| |
| /* Clear the RCOMP MMIO base address */ |
| pci_write_config32(MCHDEV, SMRBASE, 0); |
| mchtest_control(RCOMP_BAR_DISABLE); |
| } |
| |
| /*----------------------------------------------------------------------------- |
| Public interface: |
| -----------------------------------------------------------------------------*/ |
| |
| /** |
| * Go through the JEDEC initialization sequence for all DIMMs, then enable |
| * refresh and initialize ECC and memory to zero. Upon exit, SDRAM is up |
| * and running. |
| * |
| * @param ctrl PCI addresses of memory controller functions, and SMBus |
| * addresses of DIMM slots on the mainboard. |
| */ |
| static void sdram_enable(const struct mem_controller *ctrl) |
| { |
| uint8_t dimm_mask = pci_read_config16(MCHDEV, SKPD); |
| uint32_t dram_controller_mode; |
| |
| if (dimm_mask == 0) |
| return; |
| |
| /* 1 & 2 Power up and start clocks */ |
| RAM_DEBUG_MESSAGE("Ram Enable 1\n"); |
| RAM_DEBUG_MESSAGE("Ram Enable 2\n"); |
| |
| /* A 200us delay is needed */ |
| DO_DELAY; EXTRA_DELAY; |
| |
| /* 3. Apply NOP */ |
| RAM_DEBUG_MESSAGE("Ram Enable 3\n"); |
| do_ram_command(RAM_COMMAND_NOP, 0); |
| |
| /* 4 Precharge all */ |
| RAM_DEBUG_MESSAGE("Ram Enable 4\n"); |
| do_ram_command(RAM_COMMAND_PRECHARGE, 0); |
| /* wait until the all banks idle state... */ |
| |
| /* 5. Issue EMRS to enable DLL */ |
| RAM_DEBUG_MESSAGE("Ram Enable 5\n"); |
| do_ram_command(RAM_COMMAND_EMRS, |
| SDRAM_EXTMODE_DLL_ENABLE | |
| SDRAM_EXTMODE_DRIVE_NORMAL); |
| |
| /* 6. Reset DLL */ |
| RAM_DEBUG_MESSAGE("Ram Enable 6\n"); |
| set_ram_mode(E7501_SDRAM_MODE | SDRAM_MODE_DLL_RESET); |
| EXTRA_DELAY; |
| /* Ensure a 200us delay between the DLL reset in step 6 and the final |
| * mode register set in step 9. |
| * Infineon needs this before any other command is sent to the ram. |
| */ |
| DO_DELAY; EXTRA_DELAY; |
| |
| /* 7 Precharge all */ |
| RAM_DEBUG_MESSAGE("Ram Enable 7\n"); |
| do_ram_command(RAM_COMMAND_PRECHARGE, 0); |
| |
| /* 8 Now we need 2 AUTO REFRESH / CBR cycles to be performed */ |
| /* And for good luck 6 more CBRs */ |
| RAM_DEBUG_MESSAGE("Ram Enable 8\n"); |
| int i; |
| for(i=0; i<8; i++) |
| do_ram_command(RAM_COMMAND_CBR, 0); |
| |
| /* 9 mode register set */ |
| RAM_DEBUG_MESSAGE("Ram Enable 9\n"); |
| set_ram_mode(E7501_SDRAM_MODE | SDRAM_MODE_NORMAL); |
| |
| /* 10 DDR Receive FIFO RE-Sync */ |
| RAM_DEBUG_MESSAGE("Ram Enable 10\n"); |
| RAM_RESET_DDR_PTR(); |
| EXTRA_DELAY; |
| |
| /* 11 normal operation */ |
| RAM_DEBUG_MESSAGE("Ram Enable 11\n"); |
| do_ram_command(RAM_COMMAND_NORMAL, 0); |
| |
| // Reconfigure the row boundaries and Top of Low Memory |
| // to match the true size of the DIMMs |
| configure_e7501_ram_addresses(ctrl, dimm_mask); |
| |
| /* Finally enable refresh */ |
| dram_controller_mode = pci_read_config32(MCHDEV, DRC); |
| dram_controller_mode |= (1 << 29); |
| pci_write_config32(MCHDEV, DRC, dram_controller_mode); |
| EXTRA_DELAY; |
| } |
| |
| /** |
| * @param ctrl PCI addresses of memory controller functions, and SMBus |
| * addresses of DIMM slots on the mainboard. |
| */ |
| static void sdram_post_ecc(const struct mem_controller *ctrl) |
| { |
| /* Fast CS# Enable. */ |
| uint32_t dram_controller_mode = pci_read_config32(MCHDEV, DRC); |
| dram_controller_mode = pci_read_config32(MCHDEV, DRC); |
| dram_controller_mode |= (1 << 17); |
| pci_write_config32(MCHDEV, DRC, dram_controller_mode); |
| } |
| |
| /** |
| * Configure SDRAM controller parameters that depend on characteristics of the |
| * DIMMs installed in the system. These characteristics are read from the |
| * DIMMs via the standard Serial Presence Detect (SPD) interface. |
| * |
| * @param ctrl PCI addresses of memory controller functions, and SMBus |
| * addresses of DIMM slots on the mainboard. |
| */ |
| static void sdram_set_spd_registers(const struct mem_controller *ctrl) |
| { |
| uint8_t dimm_mask; |
| |
| RAM_DEBUG_MESSAGE("Reading SPD data...\n"); |
| |
| dimm_mask = spd_get_supported_dimms(ctrl); |
| |
| if (dimm_mask == 0) { |
| printk(BIOS_DEBUG, "No usable memory for this controller\n"); |
| } else { |
| enable_e7501_clocks(dimm_mask); |
| |
| RAM_DEBUG_MESSAGE("setting based on SPD data...\n"); |
| |
| configure_e7501_row_attributes(ctrl, dimm_mask); |
| configure_e7501_dram_controller_mode(ctrl, dimm_mask); |
| configure_e7501_cas_latency(ctrl, dimm_mask); |
| RAM_RESET_DDR_PTR(); |
| |
| configure_e7501_dram_timing(ctrl, dimm_mask); |
| DO_DELAY; |
| RAM_DEBUG_MESSAGE("done\n"); |
| } |
| |
| /* NOTE: configure_e7501_ram_addresses() is NOT called here. |
| * We want to keep the default 64 MB/row mapping until sdram_enable() is called, |
| * even though the default mapping is almost certainly incorrect. |
| * The default mapping makes it easy to initialize all of the DIMMs |
| * even if the total system memory is > 4 GB. |
| * |
| * Save the dimm_mask for when sdram_enable is called, so it can call |
| * configure_e7501_ram_addresses() without having to regenerate the bitmask |
| * of usable DIMMs. |
| */ |
| pci_write_config16(MCHDEV, SKPD, dimm_mask); |
| } |
| |
| /** |
| * Do basic RAM setup that does NOT depend on serial presence detect |
| * information (i.e. independent of DIMM specifics). |
| * |
| * @param ctrl PCI addresses of memory controller functions, and SMBus |
| * addresses of DIMM slots on the mainboard. |
| */ |
| static void sdram_set_registers(const struct mem_controller *ctrl) |
| { |
| uint32_t dword; |
| uint16_t word; |
| uint8_t byte; |
| |
| ram_set_rcomp_regs(); |
| |
| /* Enable 0:0.1, 0:2.1 */ |
| word = pci_read_config16(MCHDEV, DVNP); |
| word &= ~0x05; |
| pci_write_config16(MCHDEV, DVNP, word); |
| |
| /* Disable high-memory remap (power-on defaults, really) */ |
| pci_write_config16(MCHDEV, REMAPBASE, 0x03ff); |
| pci_write_config16(MCHDEV, REMAPLIMIT, 0x0); |
| |
| /* Disable legacy MMIO (0xC0000-0xEFFFF is DRAM) */ |
| int i; |
| pci_write_config8(MCHDEV, PAM_0, 0x30); |
| for (i=1; i<=6; i++) |
| pci_write_config8(MCHDEV, PAM_0 + i, 0x33); |
| |
| /* Conservatively say each row has 64MB of ram, we will fix this up later |
| * Initial TOLM 8 rows 64MB each (1<<3 * 1<<26) >> 16 = 1<<13 |
| * |
| * FIXME: Hard-coded limit to first four rows to prevent overlap! |
| */ |
| pci_write_config32(MCHDEV, DRB_ROW_0, 0x04030201); |
| pci_write_config32(MCHDEV, DRB_ROW_4, 0x04040404); |
| //pci_write_config32(MCHDEV, DRB_ROW_4, 0x08070605); |
| pci_write_config16(MCHDEV, TOLM, (1<<13)); |
| |
| /* DIMM clocks off */ |
| pci_write_config8(MCHDEV, CKDIS, 0xff); |
| |
| /* reset row attributes */ |
| pci_write_config32(MCHDEV, DRA, 0x0); |
| |
| // The only things we need to set here are DRAM idle timer, Back-to-Back Read Turnaround, and |
| // Back-to-Back Write-Read Turnaround. All others are configured based on SPD. |
| dword = pci_read_config32(MCHDEV, DRT); |
| dword &= 0xC7F8FFFF; |
| dword |= (0x28<<24)|(0x03<<16); |
| pci_write_config32(MCHDEV, DRT, dword); |
| |
| dword = pci_read_config32(MCHDEV, DRC); |
| dword &= 0xffcef8f7; |
| dword |= 0x00210008; |
| pci_write_config32(MCHDEV, DRC, dword); |
| |
| /* Undocumented */ |
| pci_write_config8(MCHDEV, 0x88, 0x80); |
| |
| /* Undocumented. Set much later in vendor BIOS. */ |
| byte = pci_read_config8(MCHDEV, 0xd9); |
| byte &= ~0x60; |
| pci_write_config8(MCHDEV, 0xd9, byte); |
| |
| #ifdef SUSPICIOUS_LOOKING_CODE |
| /* This will access D2:F0:0x50, is this correct?? |
| * Vendor BIOS reads Device ID before this is set. |
| * Undocumented in the p64h2 PCI-X bridge datasheet. |
| */ |
| byte = pci_read_config8(PCI_DEV(0,2,0), 0x50); |
| byte &= 0xcf; |
| byte |= 0x30 |
| pci_write_config8(PCI_DEV(0,2,0), 0x50, byte); |
| #endif |
| |
| uint8_t revision = pci_read_config8(MCHDEV, 0x08); |
| if (revision >= 3) |
| d060_control(D060_CMD_1); |
| } |
| |
| /** |
| * |
| * |
| */ |
| void e7505_mch_init(const struct mem_controller *memctrl) |
| { |
| RAM_DEBUG_MESSAGE("Northbridge prior to SDRAM init:\n"); |
| DUMPNORTH(); |
| |
| sdram_set_registers(memctrl); |
| sdram_set_spd_registers(memctrl); |
| sdram_enable(memctrl); |
| } |
| |
| unsigned long get_top_of_ram(void) |
| { |
| u32 tolm = (pci_read_config16(MCHDEV, TOLM) & ~0x7ff) << 16; |
| return (unsigned long) tolm; |
| } |
| |
| /** |
| * Scrub and reset error counts for ECC dimms. |
| * |
| * NOTE: this will invalidate cache and disable XIP cache for the |
| * short remaining part of romstage. |
| */ |
| void e7505_mch_scrub_ecc(unsigned long ret_addr) |
| { |
| unsigned long ret_addr2 = (unsigned long)((unsigned long*)&ret_addr-1); |
| if ((pci_read_config32(MCHDEV, DRC)>>20 & 3) == 2) |
| initialize_ecc(ret_addr, ret_addr2); |
| } |
| |
| void e7505_mch_done(const struct mem_controller *memctrl) |
| { |
| sdram_post_ecc(memctrl); |
| |
| RAM_DEBUG_MESSAGE("Northbridge following SDRAM init:\n"); |
| DUMPNORTH(); |
| } |
| |
| int e7505_mch_is_ready(void) |
| { |
| uint32_t dword = pci_read_config32(MCHDEV, DRC); |
| return !!(dword & DRC_DONE); |
| } |