202 lines
5.4 KiB
C
202 lines
5.4 KiB
C
/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/module.h>
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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/delay.h>
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#include <linux/workqueue.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/memory_alloc.h>
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#include <linux/notifier.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <mach/scm.h>
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#include <mach/msm_cache_dump.h>
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#include <mach/memory.h>
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#include <mach/msm_iomap.h>
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#include <mach/msm_memory_dump.h>
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#define L2_DUMP_OFFSET 0x14
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static unsigned long msm_cache_dump_addr;
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/*
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* These should not actually be dereferenced. There's no
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* need for a virtual mapping, but the physical address is
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* necessary.
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*/
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static struct l1_cache_dump *l1_dump;
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static struct l2_cache_dump *l2_dump;
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static int use_imem_dump_offset;
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static int msm_cache_dump_panic(struct notifier_block *this,
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unsigned long event, void *ptr)
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{
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#ifdef CONFIG_MSM_CACHE_DUMP_ON_PANIC
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/*
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* Clear the bootloader magic so the dumps aren't overwritten
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*/
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if (use_imem_dump_offset)
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__raw_writel(0, MSM_IMEM_BASE + L2_DUMP_OFFSET);
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scm_call_atomic1(L1C_SERVICE_ID, CACHE_BUFFER_DUMP_COMMAND_ID, 2);
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scm_call_atomic1(L1C_SERVICE_ID, CACHE_BUFFER_DUMP_COMMAND_ID, 1);
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#endif
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return 0;
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}
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static struct notifier_block msm_cache_dump_blk = {
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.notifier_call = msm_cache_dump_panic,
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/*
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* higher priority to ensure this runs before another panic handler
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* flushes the caches.
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*/
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.priority = 1,
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};
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static int msm_cache_dump_probe(struct platform_device *pdev)
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{
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struct msm_cache_dump_platform_data *d = pdev->dev.platform_data;
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struct msm_client_dump l1_dump_entry, l2_dump_entry;
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int ret;
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struct {
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unsigned long buf;
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unsigned long size;
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} l1_cache_data;
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void *temp;
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u32 l1_size, l2_size;
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unsigned long total_size;
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if (pdev->dev.of_node) {
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ret = of_property_read_u32(pdev->dev.of_node,
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"qcom,l1-dump-size", &l1_size);
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if (ret)
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return ret;
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ret = of_property_read_u32(pdev->dev.of_node,
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"qcom,l2-dump-size", &l2_size);
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if (ret)
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return ret;
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use_imem_dump_offset = of_property_read_bool(pdev->dev.of_node,
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"qcom,use-imem-dump-offset");
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} else {
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l1_size = d->l1_size;
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l2_size = d->l2_size;
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/* Non-DT targets assume the IMEM dump offset shall be used */
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use_imem_dump_offset = 1;
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};
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total_size = l1_size + l2_size;
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msm_cache_dump_addr = allocate_contiguous_ebi_nomap(total_size, SZ_4K);
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if (!msm_cache_dump_addr) {
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pr_err("%s: Could not get memory for cache dumping\n",
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__func__);
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return -ENOMEM;
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}
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temp = ioremap(msm_cache_dump_addr, total_size);
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memset(temp, 0xFF, total_size);
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iounmap(temp);
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l1_cache_data.buf = msm_cache_dump_addr;
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l1_cache_data.size = l1_size;
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ret = scm_call(L1C_SERVICE_ID, L1C_BUFFER_SET_COMMAND_ID,
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&l1_cache_data, sizeof(l1_cache_data), NULL, 0);
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if (ret)
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pr_err("%s: could not register L1 buffer ret = %d.\n",
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__func__, ret);
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l1_dump = (struct l1_cache_dump *)msm_cache_dump_addr;
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l2_dump = (struct l2_cache_dump *)(msm_cache_dump_addr + l1_size);
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#if defined(CONFIG_MSM_CACHE_DUMP_ON_PANIC)
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l1_cache_data.buf = msm_cache_dump_addr + l1_size;
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l1_cache_data.size = l2_size;
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ret = scm_call(L1C_SERVICE_ID, L2C_BUFFER_SET_COMMAND_ID,
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&l1_cache_data, sizeof(l1_cache_data), NULL, 0);
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if (ret)
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pr_err("%s: could not register L2 buffer ret = %d.\n",
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__func__, ret);
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#endif
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if (use_imem_dump_offset)
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__raw_writel(msm_cache_dump_addr + l1_size,
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MSM_IMEM_BASE + L2_DUMP_OFFSET);
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else {
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l1_dump_entry.id = MSM_L1_CACHE;
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l1_dump_entry.start_addr = msm_cache_dump_addr;
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l1_dump_entry.end_addr = l1_dump_entry.start_addr + l1_size - 1;
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l2_dump_entry.id = MSM_L2_CACHE;
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l2_dump_entry.start_addr = msm_cache_dump_addr + l1_size;
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l2_dump_entry.end_addr = l2_dump_entry.start_addr + l2_size - 1;
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ret = msm_dump_table_register(&l1_dump_entry);
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if (ret)
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pr_err("Could not register L1 dump area: %d\n", ret);
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ret = msm_dump_table_register(&l2_dump_entry);
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if (ret)
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pr_err("Could not register L2 dump area: %d\n", ret);
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}
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atomic_notifier_chain_register(&panic_notifier_list,
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&msm_cache_dump_blk);
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return 0;
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}
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static int msm_cache_dump_remove(struct platform_device *pdev)
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{
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atomic_notifier_chain_unregister(&panic_notifier_list,
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&msm_cache_dump_blk);
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return 0;
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}
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static struct of_device_id cache_dump_match_table[] = {
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{ .compatible = "qcom,cache_dump", },
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{}
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};
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EXPORT_COMPAT("qcom,cache_dump");
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static struct platform_driver msm_cache_dump_driver = {
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.remove = __devexit_p(msm_cache_dump_remove),
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.driver = {
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.name = "msm_cache_dump",
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.owner = THIS_MODULE,
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.of_match_table = cache_dump_match_table,
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},
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};
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static int __init msm_cache_dump_init(void)
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{
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return platform_driver_probe(&msm_cache_dump_driver,
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msm_cache_dump_probe);
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}
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static void __exit msm_cache_dump_exit(void)
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{
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platform_driver_unregister(&msm_cache_dump_driver);
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}
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late_initcall(msm_cache_dump_init);
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module_exit(msm_cache_dump_exit)
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