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![Kai Song](/assets/img/avatar_default.png)
The resource_size defines that:
res->end - res->start + 1;
The origin original code is:
sysmgr_config.max_register = res->end - res->start - 3;
So, the correct fix is that:
sysmgr_config.max_register = resource_size(res) - 4;
Fixes: d12edf9661
("mfd: altera-sysmgr: Use resource_size function on resource object")
Signed-off-by: Kai Song <songkai01@inspur.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20211006141926.6120-1-songkai01@inspur.com
201 lines
5 KiB
C
201 lines
5 KiB
C
// 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) - 4;
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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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