9f467393e2
There is no need to have the 'struct regmap *syscon_regmap' variable static since new value always be assigned before use it. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: YueHaibing <yuehaibing@huawei.com> Link: https://lore.kernel.org/r/20200715024701.28356-1-yuehaibing@huawei.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2014 Linaro Ltd.
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*
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*/
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/sys_soc.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include <linux/of.h>
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#define INTEGRATOR_HDR_ID_OFFSET 0x00
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static u32 integrator_coreid;
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static const struct of_device_id integrator_cm_match[] = {
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{ .compatible = "arm,core-module-integrator", },
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{ }
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};
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static const char *integrator_arch_str(u32 id)
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{
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switch ((id >> 16) & 0xff) {
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case 0x00:
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return "ASB little-endian";
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case 0x01:
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return "AHB little-endian";
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case 0x03:
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return "AHB-Lite system bus, bi-endian";
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case 0x04:
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return "AHB";
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case 0x08:
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return "AHB system bus, ASB processor bus";
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default:
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return "Unknown";
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}
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}
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static const char *integrator_fpga_str(u32 id)
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{
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switch ((id >> 12) & 0xf) {
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case 0x01:
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return "XC4062";
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case 0x02:
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return "XC4085";
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case 0x03:
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return "XVC600";
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case 0x04:
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return "EPM7256AE (Altera PLD)";
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default:
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return "Unknown";
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}
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}
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static ssize_t
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manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%02x\n", integrator_coreid >> 24);
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}
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static DEVICE_ATTR_RO(manufacturer);
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static ssize_t
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arch_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%s\n", integrator_arch_str(integrator_coreid));
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}
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static DEVICE_ATTR_RO(arch);
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static ssize_t
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fpga_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%s\n", integrator_fpga_str(integrator_coreid));
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}
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static DEVICE_ATTR_RO(fpga);
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static ssize_t
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build_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%02x\n", (integrator_coreid >> 4) & 0xFF);
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}
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static DEVICE_ATTR_RO(build);
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static struct attribute *integrator_attrs[] = {
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&dev_attr_manufacturer.attr,
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&dev_attr_arch.attr,
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&dev_attr_fpga.attr,
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&dev_attr_build.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(integrator);
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static int __init integrator_soc_init(void)
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{
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struct regmap *syscon_regmap;
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struct soc_device *soc_dev;
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struct soc_device_attribute *soc_dev_attr;
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struct device_node *np;
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struct device *dev;
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u32 val;
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int ret;
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np = of_find_matching_node(NULL, integrator_cm_match);
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if (!np)
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return -ENODEV;
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syscon_regmap = syscon_node_to_regmap(np);
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if (IS_ERR(syscon_regmap))
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return PTR_ERR(syscon_regmap);
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ret = regmap_read(syscon_regmap, INTEGRATOR_HDR_ID_OFFSET,
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&val);
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if (ret)
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return -ENODEV;
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integrator_coreid = val;
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soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
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if (!soc_dev_attr)
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return -ENOMEM;
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soc_dev_attr->soc_id = "Integrator";
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soc_dev_attr->machine = "Integrator";
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soc_dev_attr->family = "Versatile";
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soc_dev_attr->custom_attr_group = integrator_groups[0];
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soc_dev = soc_device_register(soc_dev_attr);
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if (IS_ERR(soc_dev)) {
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kfree(soc_dev_attr);
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return -ENODEV;
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}
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dev = soc_device_to_device(soc_dev);
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dev_info(dev, "Detected ARM core module:\n");
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dev_info(dev, " Manufacturer: %02x\n", (val >> 24));
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dev_info(dev, " Architecture: %s\n", integrator_arch_str(val));
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dev_info(dev, " FPGA: %s\n", integrator_fpga_str(val));
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dev_info(dev, " Build: %02x\n", (val >> 4) & 0xFF);
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dev_info(dev, " Rev: %c\n", ('A' + (val & 0x03)));
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return 0;
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}
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device_initcall(integrator_soc_init);
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