^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Amlogic Meson GX eFuse Driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2016 Endless Computers, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author: Carlo Caione <carlo@endlessm.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/clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/nvmem-provider.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/firmware/meson/meson_sm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static int meson_efuse_read(void *context, unsigned int offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) void *val, size_t bytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) struct meson_sm_firmware *fw = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) return meson_sm_call_read(fw, (u8 *)val, bytes, SM_EFUSE_READ, offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) bytes, 0, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static int meson_efuse_write(void *context, unsigned int offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) void *val, size_t bytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct meson_sm_firmware *fw = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) return meson_sm_call_write(fw, (u8 *)val, bytes, SM_EFUSE_WRITE, offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) bytes, 0, 0, 0);
^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) static const struct of_device_id meson_efuse_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) { .compatible = "amlogic,meson-gxbb-efuse", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) { /* sentinel */ },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) MODULE_DEVICE_TABLE(of, meson_efuse_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static int meson_efuse_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct meson_sm_firmware *fw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct device_node *sm_np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct nvmem_device *nvmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct nvmem_config *econfig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct clk *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) unsigned int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) sm_np = of_parse_phandle(pdev->dev.of_node, "secure-monitor", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) if (!sm_np) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) dev_err(&pdev->dev, "no secure-monitor node\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) fw = meson_sm_get(sm_np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) of_node_put(sm_np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (!fw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return -EPROBE_DEFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) clk = devm_clk_get(dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (IS_ERR(clk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) ret = PTR_ERR(clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (ret != -EPROBE_DEFER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) dev_err(dev, "failed to get efuse gate");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) ret = clk_prepare_enable(clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) dev_err(dev, "failed to enable gate");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) return ret;
^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) ret = devm_add_action_or_reset(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) (void(*)(void *))clk_disable_unprepare,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) dev_err(dev, "failed to add disable callback");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (meson_sm_call(fw, SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) dev_err(dev, "failed to get max user");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (!econfig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) econfig->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) econfig->name = dev_name(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) econfig->stride = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) econfig->word_size = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) econfig->reg_read = meson_efuse_read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) econfig->reg_write = meson_efuse_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) econfig->size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) econfig->priv = fw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) nvmem = devm_nvmem_register(&pdev->dev, econfig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return PTR_ERR_OR_ZERO(nvmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static struct platform_driver meson_efuse_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) .probe = meson_efuse_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) .name = "meson-efuse",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) .of_match_table = meson_efuse_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) module_platform_driver(meson_efuse_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) MODULE_DESCRIPTION("Amlogic Meson GX NVMEM driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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