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#include <linux/aee.h>
#include <linux/atomic.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/memblock.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/proc_fs.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <asm/io.h>
struct dram_console_buffer {
uint32_t sig;
uint32_t start;
uint32_t size;
uint8_t data[0];
};
#define RAM_CONSOLE_SIG (0x43474244) /* DBGC */
static char *ram_console_old_log;
static size_t ram_console_old_log_size;
static struct dram_console_buffer *dram_console_buffer;
static size_t dram_console_buffer_size;
static void dram_console_write(struct console *console, const char *msg, unsigned int count)
{
struct dram_console_buffer *buffer = dram_console_buffer;
int rem;
/* count >= buffer_size, full the buffer */
if (count >= dram_console_buffer_size) {
memcpy(buffer->data, msg + (count - dram_console_buffer_size),
dram_console_buffer_size);
buffer->start = 0;
buffer->size = dram_console_buffer_size;
} else if (count > (dram_console_buffer_size - buffer->start)) /* count > last buffer, full them and fill the head buffer */
{
rem = dram_console_buffer_size - buffer->start;
memcpy(buffer->data + buffer->start, msg, rem);
memcpy(buffer->data, msg + rem, count - rem);
buffer->start = count - rem;
buffer->size = dram_console_buffer_size;
} else /* count <= last buffer, fill in free buffer */
{
memcpy(buffer->data + buffer->start, msg, count); /* count <= last buffer, fill them */
buffer->start += count;
buffer->size += count;
if (buffer->start >= dram_console_buffer_size) {
buffer->start = 0;
}
if (buffer->size > dram_console_buffer_size) {
buffer->size = dram_console_buffer_size;
}
}
}
static struct console dram_console = {
.name = "dram",
.write = dram_console_write,
.flags = CON_PRINTBUFFER | CON_ENABLED | CON_ANYTIME,
.index = -1,
};
static void __init ram_console_save_old(const struct dram_console_buffer *buffer)
{
ram_console_old_log = kmalloc(buffer->size, GFP_KERNEL);
if (ram_console_old_log == NULL) {
LOGE("ram_console: failed to allocate old buffer\n");
return;
}
ram_console_old_log_size = buffer->size;
memcpy(ram_console_old_log, &buffer->data[buffer->start], buffer->size - buffer->start);
memcpy(ram_console_old_log + buffer->size - buffer->start, &buffer->data[0], buffer->start);
}
static int __init ram_console_init(struct dram_console_buffer *buffer, size_t buffer_size)
{
dram_console_buffer = buffer;
dram_console_buffer_size = buffer_size - sizeof(struct dram_console_buffer);
if (buffer->sig == RAM_CONSOLE_SIG) {
if (buffer->size > dram_console_buffer_size || buffer->start > buffer->size)
LOGE("ram_console: found existing invalid "
"buffer, size %d, start %d\n", buffer->size, buffer->start);
else {
LOGE("ram_console: found existing buffer, "
"size %d, start %d\n", buffer->size, buffer->start);
ram_console_save_old(buffer);
}
} else {
LOGE("ram_console: no valid data in buffer " "(sig = 0x%08x)\n", buffer->sig);
}
memset(buffer, 0, buffer_size);
buffer->sig = RAM_CONSOLE_SIG;
register_console(&dram_console);
return 0;
}
static void __init *remap_lowmem(phys_addr_t start, phys_addr_t size)
{
struct page **pages;
phys_addr_t page_start;
unsigned int page_count;
pgprot_t prot;
unsigned int i;
void *vaddr;
page_start = start - offset_in_page(start);
page_count = DIV_ROUND_UP(size + offset_in_page(start), PAGE_SIZE);
prot = pgprot_noncached(PAGE_KERNEL);
pages = kmalloc(sizeof(struct page *) * page_count, GFP_KERNEL);
if (!pages) {
pr_err("%s: Failed to allocate array for %u pages\n", __func__, page_count);
return NULL;
}
for (i = 0; i < page_count; i++) {
phys_addr_t addr = page_start + i * PAGE_SIZE;
pages[i] = pfn_to_page(addr >> PAGE_SHIFT);
}
vaddr = vmap(pages, page_count, VM_MAP, prot);
kfree(pages);
if (!vaddr) {
pr_err("%s: Failed to map %u pages\n", __func__, page_count);
return NULL;
}
return vaddr + offset_in_page(start);
}
static int __init dram_console_early_init(void)
{
struct dram_console_buffer *bufp = NULL;
size_t buffer_size = 0;
bufp = (struct dram_console_buffer *)CONFIG_MTK_AEE_DRAM_CONSOLE_ADDR;
buffer_size = CONFIG_MTK_AEE_DRAM_CONSOLE_SIZE;
bufp = remap_lowmem(CONFIG_MTK_AEE_DRAM_CONSOLE_ADDR, CONFIG_MTK_AEE_DRAM_CONSOLE_SIZE);
if (bufp == NULL) {
LOGE("ioremap failed, no ram console available\n");
return 0;
}
buffer_size = CONFIG_MTK_AEE_DRAM_CONSOLE_SIZE;
LOGE("%s: start: 0x%p, size: %d\n", __func__, bufp, buffer_size);
return ram_console_init(bufp, buffer_size);
}
static ssize_t dram_console_read_old(struct file *file, char __user *buf,
size_t len, loff_t *offset)
{
loff_t pos = *offset;
ssize_t count;
if (pos >= ram_console_old_log_size) {
return 0;
}
count = min(len, (size_t) (ram_console_old_log_size - pos));
if (copy_to_user(buf, ram_console_old_log + pos, count)) {
return -EFAULT;
}
*offset += count;
return count;
}
static const struct file_operations ram_console_file_ops = {
.owner = THIS_MODULE,
.read = dram_console_read_old,
};
void dram_console_init(struct proc_dir_entry *root_entry)
{
struct proc_dir_entry *entry;
if (ram_console_old_log == NULL) {
LOGE("%s: old log is null!\n", KBUILD_MODNAME);
return;
}
entry = create_proc_entry("last_dram_kmsg", S_IFREG | S_IRUGO, root_entry);
if (!entry) {
LOGE("%s: failed to create proc entry\n", __func__);
kfree(ram_console_old_log);
ram_console_old_log = NULL;
return;
}
entry->proc_fops = &ram_console_file_ops;
entry->size = ram_console_old_log_size;
return;
}
void dram_console_done(struct proc_dir_entry *aed_proc_dir)
{
remove_proc_entry("last_dram_kmsg", aed_proc_dir);
}
void aee_dram_console_reserve_memory(void)
{
memblock_reserve(CONFIG_MTK_AEE_DRAM_CONSOLE_ADDR, CONFIG_MTK_AEE_DRAM_CONSOLE_SIZE);
}
console_initcall(dram_console_early_init);
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