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![Suzuki K Poulose](/assets/img/avatar_default.png)
The driver_find_device() accepts a match function pointer to filter the devices for lookup, similar to bus/class_find_device(). However, there is a minor difference in the prototype for the match parameter for driver_find_device() with the now unified version accepted by {bus/class}_find_device(), where it doesn't accept a "const" qualifier for the data argument. This prevents us from reusing the generic match functions for driver_find_device(). For this reason, change the prototype of the driver_find_device() to make the "match" parameter in line with {bus/class}_find_device() and adjust its callers to use the const qualifier. Also, we could now promote the "data" parameter to const as we pass it down as a const parameter to the match functions. Cc: Corey Minyard <minyard@acm.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: Will Deacon <will.deacon@arm.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: Peter Oberparleiter <oberpar@linux.ibm.com> Cc: Sebastian Ott <sebott@linux.ibm.com> Cc: David Airlie <airlied@linux.ie> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Nehal Shah <nehal-bakulchandra.shah@amd.com> Cc: Shyam Sundar S K <shyam-sundar.s-k@amd.com> Cc: Lee Jones <lee.jones@linaro.org> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
211 lines
5.3 KiB
C
211 lines
5.3 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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* @base : the base address for the System Manager
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*/
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struct altr_sysmgr {
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struct regmap *regmap;
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resource_size_t *base;
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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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* sysmgr_match_phandle
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* Matching function used by driver_find_device().
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* Return: True if match is found, otherwise false.
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*/
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static int sysmgr_match_phandle(struct device *dev, const void *data)
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{
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return dev->of_node == (const struct device_node *)data;
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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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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(&altr_sysmgr_driver.driver, NULL,
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(void *)sysmgr_np, sysmgr_match_phandle);
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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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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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/* Need physical address for SMCC call */
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sysmgr->base = (resource_size_t *)res->start;
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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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regmap = devm_regmap_init(dev, NULL, sysmgr->base,
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&sysmgr_config);
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} else {
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sysmgr->base = devm_ioremap(dev, res->start,
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resource_size(res));
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if (!sysmgr->base)
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return -ENOMEM;
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sysmgr_config.max_register = res->end - res->start - 3;
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regmap = devm_regmap_init_mmio(dev, sysmgr->base,
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&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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