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191 lines
4.3 KiB
191 lines
4.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2017, 2020-2021, The Linux Foundation. All rights reserved. |
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*/ |
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#include <linux/device.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_platform.h> |
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#include <linux/nvmem-provider.h> |
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#include <linux/regmap.h> |
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#define SDAM_MEM_START 0x40 |
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#define REGISTER_MAP_ID 0x40 |
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#define REGISTER_MAP_VERSION 0x41 |
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#define SDAM_SIZE 0x44 |
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#define SDAM_PBS_TRIG_SET 0xE5 |
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#define SDAM_PBS_TRIG_CLR 0xE6 |
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struct sdam_chip { |
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struct regmap *regmap; |
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struct nvmem_config sdam_config; |
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unsigned int base; |
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unsigned int size; |
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}; |
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/* read only register offsets */ |
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static const u8 sdam_ro_map[] = { |
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REGISTER_MAP_ID, |
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REGISTER_MAP_VERSION, |
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SDAM_SIZE |
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}; |
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static bool sdam_is_valid(struct sdam_chip *sdam, unsigned int offset, |
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size_t len) |
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{ |
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unsigned int sdam_mem_end = SDAM_MEM_START + sdam->size - 1; |
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if (!len) |
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return false; |
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if (offset >= SDAM_MEM_START && offset <= sdam_mem_end |
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&& (offset + len - 1) <= sdam_mem_end) |
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return true; |
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else if ((offset == SDAM_PBS_TRIG_SET || offset == SDAM_PBS_TRIG_CLR) |
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&& (len == 1)) |
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return true; |
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return false; |
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} |
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static bool sdam_is_ro(unsigned int offset, size_t len) |
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{ |
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int i; |
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for (i = 0; i < ARRAY_SIZE(sdam_ro_map); i++) |
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if (offset <= sdam_ro_map[i] && (offset + len) > sdam_ro_map[i]) |
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return true; |
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return false; |
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} |
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static int sdam_read(void *priv, unsigned int offset, void *val, |
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size_t bytes) |
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{ |
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struct sdam_chip *sdam = priv; |
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struct device *dev = sdam->sdam_config.dev; |
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int rc; |
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if (!sdam_is_valid(sdam, offset, bytes)) { |
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dev_err(dev, "Invalid SDAM offset %#x len=%zd\n", |
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offset, bytes); |
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return -EINVAL; |
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} |
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rc = regmap_bulk_read(sdam->regmap, sdam->base + offset, val, bytes); |
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if (rc < 0) |
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dev_err(dev, "Failed to read SDAM offset %#x len=%zd, rc=%d\n", |
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offset, bytes, rc); |
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return rc; |
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} |
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static int sdam_write(void *priv, unsigned int offset, void *val, |
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size_t bytes) |
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{ |
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struct sdam_chip *sdam = priv; |
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struct device *dev = sdam->sdam_config.dev; |
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int rc; |
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if (!sdam_is_valid(sdam, offset, bytes)) { |
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dev_err(dev, "Invalid SDAM offset %#x len=%zd\n", |
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offset, bytes); |
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return -EINVAL; |
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} |
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if (sdam_is_ro(offset, bytes)) { |
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dev_err(dev, "Invalid write offset %#x len=%zd\n", |
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offset, bytes); |
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return -EINVAL; |
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} |
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rc = regmap_bulk_write(sdam->regmap, sdam->base + offset, val, bytes); |
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if (rc < 0) |
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dev_err(dev, "Failed to write SDAM offset %#x len=%zd, rc=%d\n", |
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offset, bytes, rc); |
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return rc; |
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} |
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static int sdam_probe(struct platform_device *pdev) |
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{ |
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struct sdam_chip *sdam; |
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struct nvmem_device *nvmem; |
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unsigned int val; |
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int rc; |
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sdam = devm_kzalloc(&pdev->dev, sizeof(*sdam), GFP_KERNEL); |
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if (!sdam) |
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return -ENOMEM; |
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sdam->regmap = dev_get_regmap(pdev->dev.parent, NULL); |
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if (!sdam->regmap) { |
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dev_err(&pdev->dev, "Failed to get regmap handle\n"); |
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return -ENXIO; |
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} |
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rc = of_property_read_u32(pdev->dev.of_node, "reg", &sdam->base); |
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if (rc < 0) { |
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dev_err(&pdev->dev, "Failed to get SDAM base, rc=%d\n", rc); |
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return -EINVAL; |
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} |
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rc = regmap_read(sdam->regmap, sdam->base + SDAM_SIZE, &val); |
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if (rc < 0) { |
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dev_err(&pdev->dev, "Failed to read SDAM_SIZE rc=%d\n", rc); |
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return -EINVAL; |
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} |
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sdam->size = val * 32; |
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sdam->sdam_config.dev = &pdev->dev; |
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sdam->sdam_config.name = "spmi_sdam"; |
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sdam->sdam_config.id = NVMEM_DEVID_AUTO; |
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sdam->sdam_config.owner = THIS_MODULE, |
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sdam->sdam_config.stride = 1; |
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sdam->sdam_config.word_size = 1; |
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sdam->sdam_config.reg_read = sdam_read; |
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sdam->sdam_config.reg_write = sdam_write; |
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sdam->sdam_config.priv = sdam; |
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nvmem = devm_nvmem_register(&pdev->dev, &sdam->sdam_config); |
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if (IS_ERR(nvmem)) { |
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dev_err(&pdev->dev, |
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"Failed to register SDAM nvmem device rc=%ld\n", |
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PTR_ERR(nvmem)); |
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return -ENXIO; |
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} |
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dev_dbg(&pdev->dev, |
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"SDAM base=%#x size=%u registered successfully\n", |
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sdam->base, sdam->size); |
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return 0; |
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} |
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static const struct of_device_id sdam_match_table[] = { |
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{ .compatible = "qcom,spmi-sdam" }, |
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{}, |
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}; |
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static struct platform_driver sdam_driver = { |
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.driver = { |
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.name = "qcom,spmi-sdam", |
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.of_match_table = sdam_match_table, |
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}, |
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.probe = sdam_probe, |
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}; |
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static int __init sdam_init(void) |
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{ |
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return platform_driver_register(&sdam_driver); |
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} |
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subsys_initcall(sdam_init); |
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static void __exit sdam_exit(void) |
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{ |
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return platform_driver_unregister(&sdam_driver); |
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} |
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module_exit(sdam_exit); |
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MODULE_DESCRIPTION("QCOM SPMI SDAM driver"); |
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MODULE_LICENSE("GPL v2");
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