diff options
Diffstat (limited to 'src/northbridge/dmp/vortex86ex/raminit.c')
-rw-r--r-- | src/northbridge/dmp/vortex86ex/raminit.c | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/src/northbridge/dmp/vortex86ex/raminit.c b/src/northbridge/dmp/vortex86ex/raminit.c new file mode 100644 index 0000000000..2382fe2440 --- /dev/null +++ b/src/northbridge/dmp/vortex86ex/raminit.c @@ -0,0 +1,325 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 DMP Electronics Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +static u16 get_mask(u16 bit_width, u16 bit_offset) +{ + u16 mask = (((1 << bit_width) - 1) << bit_offset); + return mask; +} + +static u16 set_bitfield(u16 val, u16 bits, u16 bit_width, u16 bit_offset) +{ + u16 mask = get_mask(bit_width, bit_offset); + val = (val & ~mask) | (bits << bit_offset); + return val; +} + +static u16 get_bitfield(u16 val, u16 bit_width, u16 bit_offset) +{ + u16 mask = get_mask(bit_width, bit_offset); + return (val & mask) >> bit_offset; +} + +static u8 check_address_bit(int addr_bit) +{ + u16 dummy; + *(volatile u16 *)(0) = 0; + dummy = *(volatile u16 *)(0); // read push write + *(volatile u16 *)(1 << addr_bit) = 0x5a5a; + dummy = *(volatile u16 *)(1 << addr_bit); // read push write + if ((*(volatile u16 *)(0)) != 0) + return 0; // address bit wrapped. + return 1; // address bit not wrapped. +} + +static u8 check_dram_side(int addr_bit) +{ + *(volatile u16 *)(1 << addr_bit) = 0x5a5a; + *(volatile u16 *)(0) = 0; + if ((*(volatile u16 *)(1 << addr_bit)) != 0x5a5a) + return 0; // DRAM only one side. + return 1; // two sides. +} + +// DDRIII memory bank register control: +// bit : +// 2 - 0 : DRAMC_COLSIZE : DDRIII Column Address Type : 0 0 0 = 10bit +// : 0 0 1 = 11bit +// 7 - 5 : DRAMC_ROWSIZE : DDRIII Row Address Type : 0 0 0 = 13bit +// : 0 0 1 = 14bit +// : 0 1 0 = 15bit +// : 0 1 1 = 16bit +// 11 - 8 : DRAM_SIZE : DDRIII Size : 0 1 0 1 = 64M +// : 0 1 1 0 = 128M +// : 0 1 1 1 = 256M +// : 1 0 0 0 = 512M +// : 1 0 0 1 = 1GB +// : 1 0 1 0 = 2GB +// 13 : DRAMC_CSMASK : DDRIII CS#[1] Mask : 1 = Mask CS1 enable + +#define DDR3_COL_10BIT 0 +#define DDR3_COL_11BIT 1 +#define DDR3_ROW_13BIT 0 +#define DDR3_ROW_14BIT 1 +#define DDR3_ROW_15BIT 2 +#define DDR3_ROW_16BIT 3 +#define DDR3_SIZE_64M 5 +#define DDR3_SIZE_128M 6 +#define DDR3_SIZE_256M 7 +#define DDR3_SIZE_512M 8 +#define DDR3_SIZE_1GB 9 +#define DDR3_SIZE_2GB 10 +#define DDR3_C1M_ACTIVE 0 +#define DDR3_C1M_MASK 1 + +static u16 set_ddr3_mem_reg_col(u16 reg, u16 col) +{ + return set_bitfield(reg, col, 3, 0); +} + +static u16 get_ddr3_mem_reg_col(u16 reg) +{ + return get_bitfield(reg, 3, 0); +} + +static u16 set_ddr3_mem_reg_row(u16 reg, u16 row) +{ + return set_bitfield(reg, row, 3, 5); +} + +static u16 get_ddr3_mem_reg_row(u16 reg) +{ + return get_bitfield(reg, 3, 5); +} + +static u16 set_ddr3_mem_reg_size(u16 reg, u16 size) +{ + return set_bitfield(reg, size, 4, 8); +} + +static u16 get_ddr3_mem_reg_size(u16 reg) +{ + return get_bitfield(reg, 4, 8); +} + +static u16 set_ddr3_mem_reg_c1m(u16 reg, u16 c1m) +{ + return set_bitfield(reg, c1m, 1, 13); +} + +static u16 get_ddr3_mem_reg_c1m(u16 reg) +{ + return get_bitfield(reg, 1, 13); +} + +static u16 auto_set_ddr3_mem_reg_size(u16 reg) +{ + u8 ss = 0; + // If reg is the minimum DRAM size, + // SS is also the minimum size 128M. + // If size in reg is bigger, SS is also bigger. + ss += get_ddr3_mem_reg_col(reg); + ss += get_ddr3_mem_reg_row(reg); + ss += (1 - get_ddr3_mem_reg_c1m(reg)); + ss += DDR3_SIZE_128M; + return set_ddr3_mem_reg_size(reg, ss); +} + +static u16 get_ddr3_mem_reg(u16 col, u16 row, u16 c1m) +{ + u16 reg; + reg = 0; + reg = set_ddr3_mem_reg_col(reg, col); + reg = set_ddr3_mem_reg_row(reg, row); + reg = set_ddr3_mem_reg_c1m(reg, c1m); + reg = auto_set_ddr3_mem_reg_size(reg); + return reg; +} + +static void ddr3_phy_reset(void) +{ + // PCI N/B reg FAh bit 6 = RST_DRAM_PHY. + pci_write_config8(NB1, NB1_REG_RESET_DRAMC_PHY, 0x40); + while ((pci_read_config8(NB1, NB1_REG_RESET_DRAMC_PHY) & 0x40) == 0x40) { + } + // reload mode. + u32 ddr3_cfg = pci_read_config32(NB, NB_REG_DDR3_CFG); + pci_write_config32(NB, NB_REG_DDR3_CFG, ddr3_cfg); +} + +static u8 detect_ddr3_dram_cs(u16 reg, u8 base_addr_bit) +{ + reg = set_ddr3_mem_reg_c1m(reg, DDR3_C1M_ACTIVE); + reg = auto_set_ddr3_mem_reg_size(reg); + pci_write_config16(NB, NB_REG_MBR, reg); + if (check_dram_side(base_addr_bit + 1)) { + base_addr_bit += 1; + return 0; + } + + reg = set_ddr3_mem_reg_c1m(reg, DDR3_C1M_MASK); + reg = auto_set_ddr3_mem_reg_size(reg); + pci_write_config16(NB, NB_REG_MBR, reg); + // no need to check CS = 0. + // Need to reset DDR3 PHY. + ddr3_phy_reset(); + return 0; +} + +static u8 detect_ddr3_dram_row(u16 reg, u8 base_addr_bit) +{ + reg = set_ddr3_mem_reg_row(reg, DDR3_ROW_16BIT); + reg = auto_set_ddr3_mem_reg_size(reg); + pci_write_config16(NB, NB_REG_MBR, reg); + if (check_address_bit(base_addr_bit + 16)) { + base_addr_bit += 16; + return detect_ddr3_dram_cs(reg, base_addr_bit); + } + + reg = set_ddr3_mem_reg_row(reg, DDR3_ROW_15BIT); + reg = auto_set_ddr3_mem_reg_size(reg); + pci_write_config16(NB, NB_REG_MBR, reg); + if (check_address_bit(base_addr_bit + 15)) { + base_addr_bit += 15; + return detect_ddr3_dram_cs(reg, base_addr_bit); + } + + reg = set_ddr3_mem_reg_row(reg, DDR3_ROW_14BIT); + reg = auto_set_ddr3_mem_reg_size(reg); + pci_write_config16(NB, NB_REG_MBR, reg); + if (check_address_bit(base_addr_bit + 14)) { + base_addr_bit += 14; + return detect_ddr3_dram_cs(reg, base_addr_bit); + } + + reg = set_ddr3_mem_reg_row(reg, DDR3_ROW_13BIT); + reg = auto_set_ddr3_mem_reg_size(reg); + pci_write_config16(NB, NB_REG_MBR, reg); + if (check_address_bit(base_addr_bit + 13)) { + base_addr_bit += 13; + return detect_ddr3_dram_cs(reg, base_addr_bit); + } + // row test error. + return 1; +} + +static u8 detect_ddr3_dram_bank(u16 reg, u8 base_addr_bit) +{ + /* DDR3 is always 3 bank bits */ + base_addr_bit += 3; + return detect_ddr3_dram_row(reg, base_addr_bit); +} + +static u8 detect_ddr3_dram_col(u16 reg, u8 base_addr_bit) +{ + reg = set_ddr3_mem_reg_col(reg, DDR3_COL_11BIT); + reg = auto_set_ddr3_mem_reg_size(reg); + pci_write_config16(NB, NB_REG_MBR, reg); + if (check_address_bit(base_addr_bit + 11)) { + base_addr_bit += 11; + return detect_ddr3_dram_bank(reg, base_addr_bit); + } + + reg = set_ddr3_mem_reg_col(reg, DDR3_COL_10BIT); + reg = auto_set_ddr3_mem_reg_size(reg); + pci_write_config16(NB, NB_REG_MBR, reg); + if (check_address_bit(base_addr_bit + 10)) { + base_addr_bit += 10; + return detect_ddr3_dram_bank(reg, base_addr_bit); + } + // col test error. + return 1; +} + +static u8 detect_ddr3_dram_size(void) +{ + u16 reg; + u8 base_addr_bit = 0; + reg = get_ddr3_mem_reg(DDR3_COL_10BIT, DDR3_ROW_13BIT, DDR3_C1M_MASK); + return detect_ddr3_dram_col(reg, base_addr_bit); +} + +static void print_ddr3_memory_setup(void) +{ +#if CONFIG_DEBUG_RAM_SETUP + print_debug("DDR3 Timing Reg 0-3:\n"); + print_debug("NB 6e : "); + print_debug_hex16(pci_read_config16(NB, 0x6e)); + print_debug("\nNB 74 : "); + print_debug_hex32(pci_read_config32(NB, 0x74)); + print_debug("\nNB 78 : "); + print_debug_hex32(pci_read_config32(NB, 0x78)); + print_debug("\nNB 7c : "); + print_debug_hex32(pci_read_config32(NB, 0x7c)); + u16 mbr = pci_read_config16(NB, 0x6c); + print_debug("\nNB 6c(MBR) : "); + print_debug_hex16(mbr); + const char *s; + u8 col = get_ddr3_mem_reg_col(mbr); + if (col == DDR3_COL_10BIT) + s = " (COL=10"; + else + s = " (COL=11"; + print_debug(s); + u8 row = get_ddr3_mem_reg_row(mbr); + switch (row) { + case DDR3_ROW_13BIT: + s = ", ROW = 13"; + break; + case DDR3_ROW_14BIT: + s = ", ROW = 14"; + break; + case DDR3_ROW_15BIT: + s = ", ROW = 15"; + break; + default: + s = ", ROW = 16"; + break; + } + print_debug(s); + u8 size = get_ddr3_mem_reg_size(mbr); + switch (size) { + case DDR3_SIZE_64M: + s = ", 64M"; + break; + case DDR3_SIZE_128M: + s = ", 128M"; + break; + case DDR3_SIZE_256M: + s = ", 256M"; + break; + case DDR3_SIZE_512M: + s = ", 512M"; + break; + case DDR3_SIZE_1GB: + s = ", 1GB"; + break; + case DDR3_SIZE_2GB: + s = ", 2GB"; + break; + } + print_debug(s); + u8 mask = get_ddr3_mem_reg_c1m(mbr); + if (mask == DDR3_C1M_ACTIVE) + s = ", CS MASK Enable)\n"; + else + s = ", CS Mask Disable)\n"; + print_debug(s); +#endif +} |