^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Allwinner sunXi SoCs Security ID support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2013 Oliver Schinagl <oliver@schinagl.nl>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2014 Maxime Ripard <maxime.ripard@free-electrons.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/iopoll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/nvmem-provider.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/random.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /* Registers and special values for doing register-based SID readout on H3 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define SUN8I_SID_PRCTL 0x40
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define SUN8I_SID_RDKEY 0x60
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define SUN8I_SID_OFFSET_MASK 0x1FF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define SUN8I_SID_OFFSET_SHIFT 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define SUN8I_SID_OP_LOCK (0xAC << 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define SUN8I_SID_READ BIT(1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct sunxi_sid_cfg {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) u32 value_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) u32 size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) bool need_register_readout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct sunxi_sid {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) u32 value_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static int sunxi_sid_read(void *context, unsigned int offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) void *val, size_t bytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct sunxi_sid *sid = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) memcpy_fromio(val, sid->base + sid->value_offset + offset, bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static int sun8i_sid_register_readout(const struct sunxi_sid *sid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) const unsigned int offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) u32 *out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) u32 reg_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /* Set word, lock access, and set read command */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) reg_val = (offset & SUN8I_SID_OFFSET_MASK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) << SUN8I_SID_OFFSET_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) reg_val |= SUN8I_SID_OP_LOCK | SUN8I_SID_READ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) writel(reg_val, sid->base + SUN8I_SID_PRCTL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) ret = readl_poll_timeout(sid->base + SUN8I_SID_PRCTL, reg_val,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) !(reg_val & SUN8I_SID_READ), 100, 250000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) *out = readl(sid->base + SUN8I_SID_RDKEY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) writel(0, sid->base + SUN8I_SID_PRCTL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * On Allwinner H3, the value on the 0x200 offset of the SID controller seems
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * to be not reliable at all.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * Read by the registers instead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static int sun8i_sid_read_by_reg(void *context, unsigned int offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) void *val, size_t bytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) struct sunxi_sid *sid = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) u32 word;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) /* .stride = 4 so offset is guaranteed to be aligned */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) while (bytes >= 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) ret = sun8i_sid_register_readout(sid, offset, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) val += 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) offset += 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) bytes -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (!bytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /* Handle any trailing bytes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) ret = sun8i_sid_register_readout(sid, offset, &word);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) memcpy(val, &word, bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static int sunxi_sid_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) struct resource *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct nvmem_config *nvmem_cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) struct nvmem_device *nvmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) struct sunxi_sid *sid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) char *randomness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) const struct sunxi_sid_cfg *cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) sid = devm_kzalloc(dev, sizeof(*sid), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (!sid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) cfg = of_device_get_match_data(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (!cfg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) sid->value_offset = cfg->value_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) sid->base = devm_ioremap_resource(dev, res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (IS_ERR(sid->base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) return PTR_ERR(sid->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) size = cfg->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) nvmem_cfg = devm_kzalloc(dev, sizeof(*nvmem_cfg), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (!nvmem_cfg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) nvmem_cfg->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) nvmem_cfg->name = "sunxi-sid";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) nvmem_cfg->read_only = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) nvmem_cfg->size = cfg->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) nvmem_cfg->word_size = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) nvmem_cfg->stride = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) nvmem_cfg->priv = sid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (cfg->need_register_readout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) nvmem_cfg->reg_read = sun8i_sid_read_by_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) nvmem_cfg->reg_read = sunxi_sid_read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) nvmem = devm_nvmem_register(dev, nvmem_cfg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (IS_ERR(nvmem))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return PTR_ERR(nvmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) randomness = kzalloc(size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (!randomness)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) nvmem_cfg->reg_read(sid, 0, randomness, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) add_device_randomness(randomness, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) kfree(randomness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) platform_set_drvdata(pdev, nvmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) static const struct sunxi_sid_cfg sun4i_a10_cfg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) .size = 0x10,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static const struct sunxi_sid_cfg sun7i_a20_cfg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) .size = 0x200,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) static const struct sunxi_sid_cfg sun8i_h3_cfg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) .value_offset = 0x200,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) .size = 0x100,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) .need_register_readout = true,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) static const struct sunxi_sid_cfg sun50i_a64_cfg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) .value_offset = 0x200,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) .size = 0x100,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) .need_register_readout = true,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static const struct sunxi_sid_cfg sun50i_h6_cfg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) .value_offset = 0x200,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) .size = 0x200,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static const struct of_device_id sunxi_sid_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) { .compatible = "allwinner,sun4i-a10-sid", .data = &sun4i_a10_cfg },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) { .compatible = "allwinner,sun7i-a20-sid", .data = &sun7i_a20_cfg },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) { .compatible = "allwinner,sun8i-a83t-sid", .data = &sun50i_a64_cfg },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) { .compatible = "allwinner,sun8i-h3-sid", .data = &sun8i_h3_cfg },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) { .compatible = "allwinner,sun50i-a64-sid", .data = &sun50i_a64_cfg },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) { .compatible = "allwinner,sun50i-h5-sid", .data = &sun50i_a64_cfg },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) { .compatible = "allwinner,sun50i-h6-sid", .data = &sun50i_h6_cfg },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {/* sentinel */},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) MODULE_DEVICE_TABLE(of, sunxi_sid_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) static struct platform_driver sunxi_sid_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) .probe = sunxi_sid_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) .name = "eeprom-sunxi-sid",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) .of_match_table = sunxi_sid_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) module_platform_driver(sunxi_sid_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) MODULE_AUTHOR("Oliver Schinagl <oliver@schinagl.nl>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) MODULE_DESCRIPTION("Allwinner sunxi security id driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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