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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2018 Rockchip Electronics Co. Ltd. */
#include <linux/kernel.h>
#include <linux/mtd/cfi.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "sfc_nor.h"
#include "rkflash_blk.h"
#include "rkflash_debug.h"
static struct mtd_partition nor_parts[MAX_PART_COUNT];
static inline struct SFNOR_DEV *mtd_to_sfc(struct mtd_info *ptr_mtd)
{
return (struct SFNOR_DEV *)((char *)ptr_mtd -
offsetof(struct SFNOR_DEV, mtd));
}
static int sfc_erase_mtd(struct mtd_info *mtd, struct erase_info *instr)
{
int ret;
struct SFNOR_DEV *p_dev = mtd_to_sfc(mtd);
u32 addr, len;
u32 rem;
if ((instr->addr + instr->len) > p_dev->capacity << 9)
return -EINVAL;
div_u64_rem(instr->len, mtd->erasesize, &rem);
if (rem)
return -EINVAL;
mutex_lock(&p_dev->lock);
addr = instr->addr;
len = instr->len;
if (len == p_dev->mtd.size) {
ret = snor_erase(p_dev, 0, CMD_CHIP_ERASE);
if (ret) {
PRINT_SFC_E("snor_erase CHIP 0x%x ret=%d\n",
addr, ret);
instr->state = MTD_ERASE_FAILED;
mutex_unlock(&p_dev->lock);
return -EIO;
}
} else {
while (len > 0) {
ret = snor_erase(p_dev, addr, ERASE_BLOCK64K);
if (ret) {
PRINT_SFC_E("snor_erase 0x%x ret=%d\n",
addr, ret);
instr->state = MTD_ERASE_FAILED;
mutex_unlock(&p_dev->lock);
return -EIO;
}
addr += mtd->erasesize;
len -= mtd->erasesize;
}
}
mutex_unlock(&p_dev->lock);
instr->state = MTD_ERASE_DONE;
mtd_erase_callback(instr);
return 0;
}
static int sfc_write_mtd(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
int status;
u32 addr, size, chunk, padding;
u32 page_align;
struct SFNOR_DEV *p_dev = mtd_to_sfc(mtd);
if ((to + len) > p_dev->capacity << 9)
return -EINVAL;
mutex_lock(&p_dev->lock);
addr = to;
size = len;
while (size > 0) {
page_align = addr & (NOR_PAGE_SIZE - 1);
chunk = size;
if (chunk > (NOR_PAGE_SIZE - page_align))
chunk = NOR_PAGE_SIZE - page_align;
memcpy(p_dev->dma_buf, buf, chunk);
padding = 0;
if (chunk < NOR_PAGE_SIZE) {
/* 4 bytes algin */
padding = ((chunk + 3) & 0xFFFC) - chunk;
memset(p_dev->dma_buf + chunk, 0xFF, padding);
}
status = snor_prog_page(p_dev, addr, p_dev->dma_buf,
chunk + padding);
if (status != SFC_OK) {
PRINT_SFC_E("snor_prog_page %x ret= %d\n",
addr, status);
*retlen = len - size;
mutex_unlock(&p_dev->lock);
return status;
}
size -= chunk;
addr += chunk;
buf += chunk;
}
*retlen = len;
mutex_unlock(&p_dev->lock);
return 0;
}
static int sfc_read_mtd(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
u32 addr, size, chunk;
u8 *p_buf = (u8 *)buf;
int ret = SFC_OK;
struct SFNOR_DEV *p_dev = mtd_to_sfc(mtd);
if ((from + len) > p_dev->capacity << 9)
return -EINVAL;
mutex_lock(&p_dev->lock);
addr = from;
size = len;
while (size > 0) {
chunk = (size < NOR_PAGE_SIZE) ? size : NOR_PAGE_SIZE;
ret = snor_read_data(p_dev, addr, p_dev->dma_buf, chunk);
if (ret != SFC_OK) {
PRINT_SFC_E("snor_read_data %x ret=%d\n", addr, ret);
*retlen = len - size;
mutex_unlock(&p_dev->lock);
return ret;
}
memcpy(p_buf, p_dev->dma_buf, chunk);
size -= chunk;
addr += chunk;
p_buf += chunk;
}
*retlen = len;
mutex_unlock(&p_dev->lock);
return 0;
}
/*
* if not support rk_partition and partition is confirmed, you can define
* strust def_nor_part by adding new partition like following example:
* {"u-boot", 0x1000 * 512, 0x2000 * 512},
* Note.
* 1. New partition format {name. size, offset}
* 2. Unit:Byte
* 3. Last partition 'size' can be set 0xFFFFFFFFF to fully user left space.
*/
struct mtd_partition def_nor_part[] = {};
int sfc_nor_mtd_init(struct SFNOR_DEV *p_dev)
{
int ret, i, part_num = 0;
int capacity;
struct STRUCT_PART_INFO *g_part; /* size 2KB */
capacity = p_dev->capacity;
p_dev->mtd.name = "sfc_nor";
p_dev->mtd.type = MTD_NORFLASH;
p_dev->mtd.writesize = 1;
p_dev->mtd.flags = MTD_CAP_NORFLASH;
/* see snor_write */
p_dev->mtd.size = capacity << 9;
p_dev->mtd._erase = sfc_erase_mtd;
p_dev->mtd._read = sfc_read_mtd;
p_dev->mtd._write = sfc_write_mtd;
p_dev->mtd.erasesize = g_spi_flash_info->block_size << 9;
p_dev->mtd.writebufsize = NOR_PAGE_SIZE;
p_dev->dma_buf = kmalloc(NOR_PAGE_SIZE, GFP_KERNEL | GFP_DMA);
if (!p_dev->dma_buf) {
PRINT_SFC_E("kmalloc size=0x%x failed\n", NOR_PAGE_SIZE);
ret = -ENOMEM;
goto out;
}
g_part = kmalloc(sizeof(*g_part), GFP_KERNEL | GFP_DMA);
if (!g_part) {
ret = -ENOMEM;
goto free_dma_buf;
}
part_num = 0;
if (snor_read(p_dev, 0, 4, g_part) == 4) {
if (g_part->hdr.ui_fw_tag == RK_PARTITION_TAG) {
part_num = g_part->hdr.ui_part_entry_count;
for (i = 0; i < part_num; i++) {
nor_parts[i].name =
kstrdup(g_part->part[i].sz_name,
GFP_KERNEL);
if (g_part->part[i].ui_pt_sz == 0xFFFFFFFF)
g_part->part[i].ui_pt_sz = capacity -
g_part->part[i].ui_pt_off;
nor_parts[i].offset =
(u64)g_part->part[i].ui_pt_off << 9;
nor_parts[i].size =
(u64)g_part->part[i].ui_pt_sz << 9;
nor_parts[i].mask_flags = 0;
}
} else {
part_num = ARRAY_SIZE(def_nor_part);
for (i = 0; i < part_num; i++) {
nor_parts[i].name =
kstrdup(def_nor_part[i].name,
GFP_KERNEL);
if (def_nor_part[i].size == 0xFFFFFFFF)
def_nor_part[i].size = (capacity << 9) -
def_nor_part[i].offset;
nor_parts[i].offset =
def_nor_part[i].offset;
nor_parts[i].size =
def_nor_part[i].size;
nor_parts[i].mask_flags = 0;
}
}
}
kfree(g_part);
ret = mtd_device_register(&p_dev->mtd, nor_parts, part_num);
if (ret != 0)
goto free_dma_buf;
return ret;
free_dma_buf:
kfree(p_dev->dma_buf);
out:
return ret;
}
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