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201 lines
5.0 KiB
201 lines
5.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2018-2019, Intel Corporation. |
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* Copyright (C) 2012 Freescale Semiconductor, Inc. |
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* Copyright (C) 2012 Linaro Ltd. |
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* |
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* Based on syscon driver. |
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*/ |
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#include <linux/arm-smccc.h> |
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#include <linux/err.h> |
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#include <linux/io.h> |
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#include <linux/mfd/altera-sysmgr.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/of_platform.h> |
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#include <linux/regmap.h> |
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#include <linux/slab.h> |
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/** |
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* struct altr_sysmgr - Altera SOCFPGA System Manager |
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* @regmap: the regmap used for System Manager accesses. |
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*/ |
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struct altr_sysmgr { |
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struct regmap *regmap; |
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}; |
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static struct platform_driver altr_sysmgr_driver; |
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/** |
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* s10_protected_reg_write |
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* Write to a protected SMC register. |
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* @base: Base address of System Manager |
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* @reg: Address offset of register |
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* @val: Value to write |
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* Return: INTEL_SIP_SMC_STATUS_OK (0) on success |
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* INTEL_SIP_SMC_REG_ERROR on error |
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* INTEL_SIP_SMC_RETURN_UNKNOWN_FUNCTION if not supported |
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*/ |
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static int s10_protected_reg_write(void *base, |
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unsigned int reg, unsigned int val) |
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{ |
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struct arm_smccc_res result; |
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unsigned long sysmgr_base = (unsigned long)base; |
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arm_smccc_smc(INTEL_SIP_SMC_REG_WRITE, sysmgr_base + reg, |
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val, 0, 0, 0, 0, 0, &result); |
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return (int)result.a0; |
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} |
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/** |
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* s10_protected_reg_read |
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* Read the status of a protected SMC register |
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* @base: Base address of System Manager. |
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* @reg: Address of register |
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* @val: Value read. |
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* Return: INTEL_SIP_SMC_STATUS_OK (0) on success |
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* INTEL_SIP_SMC_REG_ERROR on error |
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* INTEL_SIP_SMC_RETURN_UNKNOWN_FUNCTION if not supported |
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*/ |
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static int s10_protected_reg_read(void *base, |
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unsigned int reg, unsigned int *val) |
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{ |
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struct arm_smccc_res result; |
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unsigned long sysmgr_base = (unsigned long)base; |
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arm_smccc_smc(INTEL_SIP_SMC_REG_READ, sysmgr_base + reg, |
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0, 0, 0, 0, 0, 0, &result); |
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*val = (unsigned int)result.a1; |
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return (int)result.a0; |
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} |
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static struct regmap_config altr_sysmgr_regmap_cfg = { |
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.name = "altr_sysmgr", |
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.reg_bits = 32, |
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.reg_stride = 4, |
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.val_bits = 32, |
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.fast_io = true, |
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.use_single_read = true, |
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.use_single_write = true, |
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}; |
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/** |
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* altr_sysmgr_regmap_lookup_by_phandle |
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* Find the sysmgr previous configured in probe() and return regmap property. |
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* Return: regmap if found or error if not found. |
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* |
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* @np: Pointer to device's Device Tree node |
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* @property: Device Tree property name which references the sysmgr |
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*/ |
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struct regmap *altr_sysmgr_regmap_lookup_by_phandle(struct device_node *np, |
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const char *property) |
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{ |
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struct device *dev; |
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struct altr_sysmgr *sysmgr; |
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struct device_node *sysmgr_np; |
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if (property) |
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sysmgr_np = of_parse_phandle(np, property, 0); |
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else |
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sysmgr_np = np; |
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if (!sysmgr_np) |
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return ERR_PTR(-ENODEV); |
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dev = driver_find_device_by_of_node(&altr_sysmgr_driver.driver, |
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(void *)sysmgr_np); |
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of_node_put(sysmgr_np); |
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if (!dev) |
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return ERR_PTR(-EPROBE_DEFER); |
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sysmgr = dev_get_drvdata(dev); |
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return sysmgr->regmap; |
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} |
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EXPORT_SYMBOL_GPL(altr_sysmgr_regmap_lookup_by_phandle); |
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static int sysmgr_probe(struct platform_device *pdev) |
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{ |
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struct altr_sysmgr *sysmgr; |
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struct regmap *regmap; |
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struct resource *res; |
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struct regmap_config sysmgr_config = altr_sysmgr_regmap_cfg; |
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struct device *dev = &pdev->dev; |
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struct device_node *np = dev->of_node; |
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void __iomem *base; |
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sysmgr = devm_kzalloc(dev, sizeof(*sysmgr), GFP_KERNEL); |
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if (!sysmgr) |
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return -ENOMEM; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!res) |
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return -ENOENT; |
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sysmgr_config.max_register = resource_size(res) - |
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sysmgr_config.reg_stride; |
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if (of_device_is_compatible(np, "altr,sys-mgr-s10")) { |
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sysmgr_config.reg_read = s10_protected_reg_read; |
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sysmgr_config.reg_write = s10_protected_reg_write; |
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/* Need physical address for SMCC call */ |
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regmap = devm_regmap_init(dev, NULL, |
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(void *)(uintptr_t)res->start, |
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&sysmgr_config); |
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} else { |
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base = devm_ioremap(dev, res->start, resource_size(res)); |
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if (!base) |
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return -ENOMEM; |
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sysmgr_config.max_register = resource_size(res) - 3; |
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regmap = devm_regmap_init_mmio(dev, base, &sysmgr_config); |
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} |
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if (IS_ERR(regmap)) { |
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pr_err("regmap init failed\n"); |
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return PTR_ERR(regmap); |
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} |
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sysmgr->regmap = regmap; |
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platform_set_drvdata(pdev, sysmgr); |
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return 0; |
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} |
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static const struct of_device_id altr_sysmgr_of_match[] = { |
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{ .compatible = "altr,sys-mgr" }, |
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{ .compatible = "altr,sys-mgr-s10" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, altr_sysmgr_of_match); |
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static struct platform_driver altr_sysmgr_driver = { |
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.probe = sysmgr_probe, |
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.driver = { |
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.name = "altr,system_manager", |
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.of_match_table = altr_sysmgr_of_match, |
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}, |
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}; |
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static int __init altr_sysmgr_init(void) |
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{ |
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return platform_driver_register(&altr_sysmgr_driver); |
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} |
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core_initcall(altr_sysmgr_init); |
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static void __exit altr_sysmgr_exit(void) |
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{ |
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platform_driver_unregister(&altr_sysmgr_driver); |
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} |
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module_exit(altr_sysmgr_exit); |
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MODULE_AUTHOR("Thor Thayer <>"); |
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MODULE_DESCRIPTION("SOCFPGA System Manager driver"); |
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MODULE_LICENSE("GPL v2");
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