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/*
* Copyright (C) ST-Ericsson SA 2011
*
* License Terms: GNU General Public License v2
* Author: Johan Bjornstedt <johan.bjornstedt@stericsson.com>
*
* Save DBx500 registers in case of kernel crash
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/kdebug.h>
#include <mach/hardware.h>
#include <mach/db8500-regs.h>
#include <mach/db5500-regs.h>
struct dbx500_dump_info {
char *name;
int *data;
int *io_addr;
int phy_addr;
int size;
};
static struct dbx500_dump_info db8500_dump[] = {
{
.name = "prcmu_tcdm",
.phy_addr = U8500_PRCMU_TCDM_BASE,
.size = 0x1000,
},
{
.name = "prcmu_non_sec_1",
.phy_addr = U8500_PRCMU_BASE,
.size = 0x340,
},
{
.name = "prcmu_pmb",
.phy_addr = (U8500_PRCMU_BASE + 0x344),
.size = 0xC,
},
{
.name = "prcmu_thermal",
.phy_addr = (U8500_PRCMU_BASE + 0x3C0),
.size = 0x40,
},
{
.name = "prcmu_non_sec_2",
.phy_addr = (U8500_PRCMU_BASE + 0x404),
.size = 0x1FC,
},
{
.name = "prcmu_icn_pmu",
.phy_addr = (U8500_PRCMU_BASE + 0xE00),
.size = 0x90,
},
{
.name = "db8500_fuses",
.phy_addr = (U8500_BACKUPRAM1_BASE + 0xF70),
.size = 0xc,
},
};
static struct dbx500_dump_info db9540_dump[] = {
{
.name = "prcmu_tcdm",
.phy_addr = U9540_PRCMU_TCDM_BASE,
.size = 0x1000,
},
{
.name = "prcmu_non_sec_1",
.phy_addr = U8500_PRCMU_BASE,
.size = 0x340,
},
{
.name = "prcmu_pmb",
.phy_addr = (U8500_PRCMU_BASE + 0x344),
.size = 0xC,
},
{
.name = "prcmu_thermal",
.phy_addr = (U8500_PRCMU_BASE + 0x3C0),
.size = 0x40,
},
{
.name = "prcmu_non_sec_2",
.phy_addr = (U8500_PRCMU_BASE + 0x404),
.size = 0x1FC,
},
{
.name = "prcmu_icn_pmu",
.phy_addr = (U8500_PRCMU_BASE + 0xE00),
.size = 0x118,
},
};
static struct dbx500_dump_info db5500_dump[] = {
{
.name = "prcmu_tcdm",
.phy_addr = U5500_PRCMU_TCDM_BASE,
.size = 0x5000,
},
{
.name = "prcmu_gpio",
.phy_addr = U5500_GPIO2_BASE,
.size = 0x1000,
},
{
.name = "prcmu_msp1",
.phy_addr = U5500_MSP1_BASE,
.size = 0x1000,
},
{
.name = "prcmu_sec",
.phy_addr = (U5500_PRCMU_BASE + 0x1000),
.size = 0x1000,
},
{
.name = "prcmu_unsec",
.phy_addr = U5500_PRCMU_BASE,
.size = 0x1000,
},
};
static struct dbx500_dump_info *dbx500_dump;
static int dbx500_dump_size;
static bool dbx500_dump_done;
static DEFINE_SPINLOCK(dbx500_dump_lock);
static int crash_notifier(struct notifier_block *nb, unsigned long val,
void *data)
{
int i;
unsigned long flags;
/*
* Since there are two ways into this function (die and panic) we have
* to make sure we only dump the DB registers once
*/
spin_lock_irqsave(&dbx500_dump_lock, flags);
if (dbx500_dump_done)
return NOTIFY_DONE;
pr_info("dbx500_dump notified of crash\n");
for (i = 0; i < dbx500_dump_size; i++) {
memcpy_fromio(dbx500_dump[i].data, dbx500_dump[i].io_addr,
dbx500_dump[i].size);
}
dbx500_dump_done = true;
spin_unlock_irqrestore(&dbx500_dump_lock, flags);
return NOTIFY_DONE;
}
static void __init init_io_addresses(void)
{
int i;
for (i = 0; i < dbx500_dump_size; i++)
dbx500_dump[i].io_addr = ioremap(dbx500_dump[i].phy_addr,
dbx500_dump[i].size);
}
static struct notifier_block die_notifier = {
.notifier_call = crash_notifier,
};
static struct notifier_block panic_notifier = {
.notifier_call = crash_notifier,
};
int __init dbx500_dump_init(void)
{
int err, i;
if (cpu_is_u5500()) {
dbx500_dump = db5500_dump;
dbx500_dump_size = ARRAY_SIZE(db5500_dump);
} else if (cpu_is_u8500()) {
dbx500_dump = db8500_dump;
dbx500_dump_size = ARRAY_SIZE(db8500_dump);
} else if (cpu_is_u9540()) {
dbx500_dump = db9540_dump;
dbx500_dump_size = ARRAY_SIZE(db9540_dump);
} else {
ux500_unknown_soc();
}
for (i = 0; i < dbx500_dump_size; i++) {
dbx500_dump[i].data = kmalloc(dbx500_dump[i].size, GFP_KERNEL);
if (!dbx500_dump[i].data) {
pr_err("dbx500_dump: Could not allocate memory for "
"%s\n", dbx500_dump[i].name);
err = -ENOMEM;
goto free_mem;
}
}
init_io_addresses();
err = atomic_notifier_chain_register(&panic_notifier_list,
&panic_notifier);
if (err != 0) {
pr_err("dbx500_dump: Unable to register a panic notifier %d\n",
err);
goto free_mem;
}
err = register_die_notifier(&die_notifier);
if (err != 0) {
pr_err("dbx500_dump: Unable to register a die notifier %d\n",
err);
goto free_panic_notifier;
}
pr_info("dbx500_dump: driver initialized\n");
return err;
free_panic_notifier:
atomic_notifier_chain_unregister(&panic_notifier_list,
&panic_notifier);
free_mem:
for (i = i - 1; i >= 0; i--)
kfree(dbx500_dump[i].data);
return err;
}
arch_initcall(dbx500_dump_init);
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