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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 | // SPDX-License-Identifier: GPL-2.0 /* * (C) Copyright 2017 Rockchip Electronics Co., Ltd */ #include <dm.h> #include <log.h> #include <malloc.h> #include <reset-uclass.h> #include <linux/bitops.h> #include <linux/io.h> #include <asm/arch-rockchip/hardware.h> #include <dm/device-internal.h> #include <dm/lists.h> /* * Each reg has 16 bits reset signal for devices * Note: Not including rk2818 and older SoCs */ #define ROCKCHIP_RESET_NUM_IN_REG 16 struct rockchip_reset_priv { void __iomem *base; const int *lut; /* Rockchip reset reg locate at cru controller */ u32 reset_reg_offset; /* Rockchip reset reg number */ u32 reset_reg_num; }; static int rockchip_reset_request(struct reset_ctl *reset_ctl) { struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev); unsigned long id = reset_ctl->id; if (priv->lut) id = priv->lut[id]; debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_num=%d)\n", __func__, reset_ctl, reset_ctl->dev, id, priv->reset_reg_num); if (id / ROCKCHIP_RESET_NUM_IN_REG >= priv->reset_reg_num) return -EINVAL; return 0; } static int rockchip_reset_assert(struct reset_ctl *reset_ctl) { struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev); unsigned long id = reset_ctl->id; int bank, offset; if (priv->lut) id = priv->lut[id]; bank = id / ROCKCHIP_RESET_NUM_IN_REG; offset = id % ROCKCHIP_RESET_NUM_IN_REG; debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__, reset_ctl, reset_ctl->dev, id, priv->base + (bank * 4)); rk_setreg(priv->base + (bank * 4), BIT(offset)); return 0; } static int rockchip_reset_deassert(struct reset_ctl *reset_ctl) { struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev); unsigned long id = reset_ctl->id; int bank, offset; if (priv->lut) id = priv->lut[id]; bank = id / ROCKCHIP_RESET_NUM_IN_REG; offset = id % ROCKCHIP_RESET_NUM_IN_REG; debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__, reset_ctl, reset_ctl->dev, id, priv->base + (bank * 4)); rk_clrreg(priv->base + (bank * 4), BIT(offset)); return 0; } struct reset_ops rockchip_reset_ops = { .request = rockchip_reset_request, .rst_assert = rockchip_reset_assert, .rst_deassert = rockchip_reset_deassert, }; static int rockchip_reset_probe(struct udevice *dev) { struct rockchip_reset_priv *priv = dev_get_priv(dev); fdt_addr_t addr; fdt_size_t size; addr = dev_read_addr_size(dev, &size); if (addr == FDT_ADDR_T_NONE) return -EINVAL; if ((priv->reset_reg_offset == 0) && (priv->reset_reg_num == 0)) return -EINVAL; addr += priv->reset_reg_offset; priv->base = ioremap(addr, size); debug("%s(base=%p) (reg_offset=%x, reg_num=%d)\n", __func__, priv->base, priv->reset_reg_offset, priv->reset_reg_num); return 0; } int rockchip_reset_bind_lut(struct udevice *pdev, const int *lookup_table, u32 reg_offset, u32 reg_number) { struct udevice *rst_dev; struct rockchip_reset_priv *priv; int ret; ret = device_bind_driver_to_node(pdev, "rockchip_reset", "reset", dev_ofnode(pdev), &rst_dev); if (ret) { debug("Warning: No rockchip reset driver: ret=%d\n", ret); return ret; } priv = malloc(sizeof(struct rockchip_reset_priv)); priv->reset_reg_offset = reg_offset; priv->reset_reg_num = reg_number; priv->lut = lookup_table; dev_set_priv(rst_dev, priv); return 0; } int rockchip_reset_bind(struct udevice *pdev, u32 reg_offset, u32 reg_number) { return rockchip_reset_bind_lut(pdev, NULL, reg_offset, reg_number); } U_BOOT_DRIVER(rockchip_reset) = { .name = "rockchip_reset", .id = UCLASS_RESET, .probe = rockchip_reset_probe, .ops = &rockchip_reset_ops, .priv_auto = sizeof(struct rockchip_reset_priv), }; |