1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com> 4 * 5 * Derived from linux/arch/mips/bcm63xx/cpu.c: 6 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr> 7 * Copyright (C) 2009 Florian Fainelli <florian@openwrt.org> 8 */ 9 10 #include <common.h> 11 #include <dm.h> 12 #include <errno.h> 13 #include <ram.h> 14 #include <asm/io.h> 15 16 #define SDRAM_CFG_REG 0x0 17 #define SDRAM_CFG_COL_SHIFT 4 18 #define SDRAM_CFG_COL_MASK (0x3 << SDRAM_CFG_COL_SHIFT) 19 #define SDRAM_CFG_ROW_SHIFT 6 20 #define SDRAM_CFG_ROW_MASK (0x3 << SDRAM_CFG_ROW_SHIFT) 21 #define SDRAM_CFG_32B_SHIFT 10 22 #define SDRAM_CFG_32B_MASK (1 << SDRAM_CFG_32B_SHIFT) 23 #define SDRAM_CFG_BANK_SHIFT 13 24 #define SDRAM_CFG_BANK_MASK (1 << SDRAM_CFG_BANK_SHIFT) 25 #define SDRAM_6318_SPACE_SHIFT 4 26 #define SDRAM_6318_SPACE_MASK (0xf << SDRAM_6318_SPACE_SHIFT) 27 28 #define MEMC_CFG_REG 0x4 29 #define MEMC_CFG_32B_SHIFT 1 30 #define MEMC_CFG_32B_MASK (1 << MEMC_CFG_32B_SHIFT) 31 #define MEMC_CFG_COL_SHIFT 3 32 #define MEMC_CFG_COL_MASK (0x3 << MEMC_CFG_COL_SHIFT) 33 #define MEMC_CFG_ROW_SHIFT 6 34 #define MEMC_CFG_ROW_MASK (0x3 << MEMC_CFG_ROW_SHIFT) 35 36 #define DDR_CSEND_REG 0x8 37 38 struct bmips_ram_priv; 39 40 struct bmips_ram_hw { 41 ulong (*get_ram_size)(struct bmips_ram_priv *); 42 }; 43 44 struct bmips_ram_priv { 45 void __iomem *regs; 46 const struct bmips_ram_hw *hw; 47 }; 48 49 static ulong bcm6318_get_ram_size(struct bmips_ram_priv *priv) 50 { 51 u32 val; 52 53 val = readl_be(priv->regs + SDRAM_CFG_REG); 54 val = (val & SDRAM_6318_SPACE_MASK) >> SDRAM_6318_SPACE_SHIFT; 55 56 return (1 << (val + 20)); 57 } 58 59 static ulong bcm6328_get_ram_size(struct bmips_ram_priv *priv) 60 { 61 return readl_be(priv->regs + DDR_CSEND_REG) << 24; 62 } 63 64 static ulong bmips_dram_size(unsigned int cols, unsigned int rows, 65 unsigned int is_32b, unsigned int banks) 66 { 67 rows += 11; /* 0 => 11 address bits ... 2 => 13 address bits */ 68 cols += 8; /* 0 => 8 address bits ... 2 => 10 address bits */ 69 is_32b += 1; 70 71 return 1 << (cols + rows + is_32b + banks); 72 } 73 74 static ulong bcm6338_get_ram_size(struct bmips_ram_priv *priv) 75 { 76 unsigned int cols = 0, rows = 0, is_32b = 0, banks = 0; 77 u32 val; 78 79 val = readl_be(priv->regs + SDRAM_CFG_REG); 80 rows = (val & SDRAM_CFG_ROW_MASK) >> SDRAM_CFG_ROW_SHIFT; 81 cols = (val & SDRAM_CFG_COL_MASK) >> SDRAM_CFG_COL_SHIFT; 82 is_32b = (val & SDRAM_CFG_32B_MASK) ? 1 : 0; 83 banks = (val & SDRAM_CFG_BANK_MASK) ? 2 : 1; 84 85 return bmips_dram_size(cols, rows, is_32b, banks); 86 } 87 88 static ulong bcm6358_get_ram_size(struct bmips_ram_priv *priv) 89 { 90 unsigned int cols = 0, rows = 0, is_32b = 0; 91 u32 val; 92 93 val = readl_be(priv->regs + MEMC_CFG_REG); 94 rows = (val & MEMC_CFG_ROW_MASK) >> MEMC_CFG_ROW_SHIFT; 95 cols = (val & MEMC_CFG_COL_MASK) >> MEMC_CFG_COL_SHIFT; 96 is_32b = (val & MEMC_CFG_32B_MASK) ? 0 : 1; 97 98 return bmips_dram_size(cols, rows, is_32b, 2); 99 } 100 101 static int bmips_ram_get_info(struct udevice *dev, struct ram_info *info) 102 { 103 struct bmips_ram_priv *priv = dev_get_priv(dev); 104 const struct bmips_ram_hw *hw = priv->hw; 105 106 info->base = 0x80000000; 107 info->size = hw->get_ram_size(priv); 108 109 return 0; 110 } 111 112 static const struct ram_ops bmips_ram_ops = { 113 .get_info = bmips_ram_get_info, 114 }; 115 116 static const struct bmips_ram_hw bmips_ram_bcm6318 = { 117 .get_ram_size = bcm6318_get_ram_size, 118 }; 119 120 static const struct bmips_ram_hw bmips_ram_bcm6328 = { 121 .get_ram_size = bcm6328_get_ram_size, 122 }; 123 124 static const struct bmips_ram_hw bmips_ram_bcm6338 = { 125 .get_ram_size = bcm6338_get_ram_size, 126 }; 127 128 static const struct bmips_ram_hw bmips_ram_bcm6358 = { 129 .get_ram_size = bcm6358_get_ram_size, 130 }; 131 132 static const struct udevice_id bmips_ram_ids[] = { 133 { 134 .compatible = "brcm,bcm6318-mc", 135 .data = (ulong)&bmips_ram_bcm6318, 136 }, { 137 .compatible = "brcm,bcm6328-mc", 138 .data = (ulong)&bmips_ram_bcm6328, 139 }, { 140 .compatible = "brcm,bcm6338-mc", 141 .data = (ulong)&bmips_ram_bcm6338, 142 }, { 143 .compatible = "brcm,bcm6358-mc", 144 .data = (ulong)&bmips_ram_bcm6358, 145 }, { /* sentinel */ } 146 }; 147 148 static int bmips_ram_probe(struct udevice *dev) 149 { 150 struct bmips_ram_priv *priv = dev_get_priv(dev); 151 const struct bmips_ram_hw *hw = 152 (const struct bmips_ram_hw *)dev_get_driver_data(dev); 153 154 priv->regs = dev_remap_addr(dev); 155 if (!priv->regs) 156 return -EINVAL; 157 158 priv->hw = hw; 159 160 return 0; 161 } 162 163 U_BOOT_DRIVER(bmips_ram) = { 164 .name = "bmips-mc", 165 .id = UCLASS_RAM, 166 .of_match = bmips_ram_ids, 167 .probe = bmips_ram_probe, 168 .priv_auto_alloc_size = sizeof(struct bmips_ram_priv), 169 .ops = &bmips_ram_ops, 170 .flags = DM_FLAG_PRE_RELOC, 171 }; 172