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![Sudeep Holla](/assets/img/avatar_default.png)
Commit c31e73121f
("base: soc: Handle custom soc information sysfs
entries") introduced custom soc attribute group in soc_device_attribute
structure but there are no users treewide. While trying to understand
the motivation and tried to use it, it was found lot of existing custom
attributes can moved to use it instead of device_create_file.
Though most of these never remove/cleanup the custom attribute as they
never call soc_device_unregister, using these custom attribute group
eliminate the need for any cleanup as the driver infrastructure will
take care of that.
Let us remove device_create_file and start using the custom attribute
group in soc_device_attribute.
Link: https://lore.kernel.org/r/20200523170859.50003-7-sudeep.holla@arm.com
Cc: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
227 lines
5 KiB
C
227 lines
5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/sys_soc.h>
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#include <asm/cputype.h>
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#include <asm/tlbflush.h>
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#include <asm/cacheflush.h>
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#include <asm/mach/map.h>
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/**
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* struct dbx500_asic_id - fields of the ASIC ID
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* @process: the manufacturing process, 0x40 is 40 nm 0x00 is "standard"
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* @partnumber: hithereto 0x8500 for DB8500
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* @revision: version code in the series
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*/
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struct dbx500_asic_id {
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u16 partnumber;
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u8 revision;
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u8 process;
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};
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static struct dbx500_asic_id dbx500_id;
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static unsigned int __init ux500_read_asicid(phys_addr_t addr)
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{
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void __iomem *virt = ioremap(addr, 4);
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unsigned int asicid;
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if (!virt)
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return 0;
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asicid = readl(virt);
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iounmap(virt);
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return asicid;
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}
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static void ux500_print_soc_info(unsigned int asicid)
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{
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unsigned int rev = dbx500_id.revision;
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pr_info("DB%4x ", dbx500_id.partnumber);
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if (rev == 0x01)
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pr_cont("Early Drop");
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else if (rev >= 0xA0)
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pr_cont("v%d.%d" , (rev >> 4) - 0xA + 1, rev & 0xf);
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else
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pr_cont("Unknown");
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pr_cont(" [%#010x]\n", asicid);
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}
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static unsigned int partnumber(unsigned int asicid)
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{
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return (asicid >> 8) & 0xffff;
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}
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/*
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* SOC MIDR ASICID ADDRESS ASICID VALUE
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* DB8500ed 0x410fc090 0x9001FFF4 0x00850001
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* DB8500v1 0x411fc091 0x9001FFF4 0x008500A0
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* DB8500v1.1 0x411fc091 0x9001FFF4 0x008500A1
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* DB8500v2 0x412fc091 0x9001DBF4 0x008500B0
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* DB8520v2.2 0x412fc091 0x9001DBF4 0x008500B2
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* DB5500v1 0x412fc091 0x9001FFF4 0x005500A0
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* DB9540 0x413fc090 0xFFFFDBF4 0x009540xx
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*/
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static void __init ux500_setup_id(void)
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{
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unsigned int cpuid = read_cpuid_id();
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unsigned int asicid = 0;
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phys_addr_t addr = 0;
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switch (cpuid) {
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case 0x410fc090: /* DB8500ed */
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case 0x411fc091: /* DB8500v1 */
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addr = 0x9001FFF4;
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break;
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case 0x412fc091: /* DB8520 / DB8500v2 / DB5500v1 */
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asicid = ux500_read_asicid(0x9001DBF4);
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if (partnumber(asicid) == 0x8500 ||
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partnumber(asicid) == 0x8520)
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/* DB8500v2 */
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break;
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/* DB5500v1 */
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addr = 0x9001FFF4;
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break;
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case 0x413fc090: /* DB9540 */
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addr = 0xFFFFDBF4;
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break;
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}
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if (addr)
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asicid = ux500_read_asicid(addr);
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if (!asicid) {
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pr_err("Unable to identify SoC\n");
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BUG();
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}
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dbx500_id.process = asicid >> 24;
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dbx500_id.partnumber = partnumber(asicid);
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dbx500_id.revision = asicid & 0xff;
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ux500_print_soc_info(asicid);
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}
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static const char * __init ux500_get_machine(void)
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{
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return kasprintf(GFP_KERNEL, "DB%4x", dbx500_id.partnumber);
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}
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static const char * __init ux500_get_family(void)
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{
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return kasprintf(GFP_KERNEL, "ux500");
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}
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static const char * __init ux500_get_revision(void)
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{
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unsigned int rev = dbx500_id.revision;
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if (rev == 0x01)
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return kasprintf(GFP_KERNEL, "%s", "ED");
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else if (rev >= 0xA0)
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return kasprintf(GFP_KERNEL, "%d.%d",
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(rev >> 4) - 0xA + 1, rev & 0xf);
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return kasprintf(GFP_KERNEL, "%s", "Unknown");
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}
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static ssize_t
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process_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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if (dbx500_id.process == 0x00)
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return sprintf(buf, "Standard\n");
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return sprintf(buf, "%02xnm\n", dbx500_id.process);
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}
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static DEVICE_ATTR_RO(process);
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static struct attribute *ux500_soc_attrs[] = {
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&dev_attr_process.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(ux500_soc);
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static const char *db8500_read_soc_id(struct device_node *backupram)
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{
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void __iomem *base;
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void __iomem *uid;
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const char *retstr;
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base = of_iomap(backupram, 0);
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if (!base)
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return NULL;
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uid = base + 0x1fc0;
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/* Throw these device-specific numbers into the entropy pool */
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add_device_randomness(uid, 0x14);
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retstr = kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x",
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readl((u32 *)uid+0),
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readl((u32 *)uid+1), readl((u32 *)uid+2),
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readl((u32 *)uid+3), readl((u32 *)uid+4));
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iounmap(base);
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return retstr;
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}
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static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,
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struct device_node *backupram)
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{
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soc_dev_attr->soc_id = db8500_read_soc_id(backupram);
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soc_dev_attr->machine = ux500_get_machine();
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soc_dev_attr->family = ux500_get_family();
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soc_dev_attr->revision = ux500_get_revision();
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soc_dev_attr->custom_attr_group = ux500_soc_groups[0];
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}
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static int __init ux500_soc_device_init(void)
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{
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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 *backupram;
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backupram = of_find_compatible_node(NULL, NULL, "ste,dbx500-backupram");
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if (!backupram)
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return 0;
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ux500_setup_id();
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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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of_node_put(backupram);
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return -ENOMEM;
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}
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soc_info_populate(soc_dev_attr, backupram);
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of_node_put(backupram);
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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 PTR_ERR(soc_dev);
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}
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return 0;
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}
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subsys_initcall(ux500_soc_device_init);
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