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/* SPDX-License-Identifier: GPL-2.0-only */
#include <assert.h>
#include <console/console.h>
#include <device/mmio.h>
#include <soc/flash_controller.h>
#include <spi_flash.h>
#include <spi-generic.h>
#include <stdint.h>
#include <string.h>
#include <timer.h>
#include <types.h>
#define GET_NTH_BYTE(d, n) ((d >> (8 * n)) & 0xff)
static int polling_cmd(u32 val)
{
struct stopwatch sw;
stopwatch_init_usecs_expire(&sw, SFLASH_POLLINGREG_US);
while ((read32(&mt8192_nor->cmd) & val) != 0) {
if (stopwatch_expired(&sw))
return -1;
}
return 0;
}
static int mt8192_nor_execute_cmd(u8 cmdval)
{
u8 val = cmdval & ~SFLASH_AUTOINC;
write8(&mt8192_nor->cmd, cmdval);
return polling_cmd(val);
}
static int sflashhw_read_flash_status(u8 *value)
{
if (mt8192_nor_execute_cmd(SFLASH_READSTATUS))
return -1;
*value = read8(&mt8192_nor->rdsr);
return 0;
}
static int wait_for_write_done(void)
{
struct stopwatch sw;
u8 reg;
stopwatch_init_usecs_expire(&sw, SFLASH_POLLINGREG_US);
while (sflashhw_read_flash_status(®) == 0) {
if (!(reg & SFLASH_WRITE_IN_PROGRESS))
return 0;
if (stopwatch_expired(&sw))
return -1;
}
return -1;
}
/* set serial flash program address */
static void set_sfpaddr(u32 addr)
{
write8(&mt8192_nor->radr[2], GET_NTH_BYTE(addr, 2));
write8(&mt8192_nor->radr[1], GET_NTH_BYTE(addr, 1));
write8(&mt8192_nor->radr[0], GET_NTH_BYTE(addr, 0));
}
static int sector_erase(int offset)
{
if (wait_for_write_done())
return -1;
write8(&mt8192_nor->prgdata[5], SFLASH_OP_WREN);
write8(&mt8192_nor->cnt, 8);
mt8192_nor_execute_cmd(SFLASH_PRG_CMD);
write8(&mt8192_nor->prgdata[5], SECTOR_ERASE_CMD);
write8(&mt8192_nor->prgdata[4], GET_NTH_BYTE(offset, 2));
write8(&mt8192_nor->prgdata[3], GET_NTH_BYTE(offset, 1));
write8(&mt8192_nor->prgdata[2], GET_NTH_BYTE(offset, 0));
write8(&mt8192_nor->cnt, 32);
mt8192_nor_execute_cmd(SFLASH_PRG_CMD);
if (wait_for_write_done())
return -1;
return 0;
}
static int pio_read(u32 addr, u8 *buf, u32 len)
{
set_sfpaddr(addr);
while (len) {
if (mt8192_nor_execute_cmd(SFLASH_RD_TRIGGER | SFLASH_AUTOINC))
return -1;
*buf++ = read8(&mt8192_nor->rdata);
len--;
}
return 0;
}
static int nor_read(const struct spi_flash *flash, u32 addr, size_t len,
void *buf)
{
if (pio_read(addr, buf, len))
return -1;
return 0;
}
static int nor_write(const struct spi_flash *flash, u32 addr, size_t len,
const void *buf)
{
const u8 *buffer = (const u8 *)buf;
set_sfpaddr(addr);
while (len) {
write8(&mt8192_nor->wdata, *buffer);
if (mt8192_nor_execute_cmd(SFLASH_WR_TRIGGER | SFLASH_AUTOINC))
return -1;
if (wait_for_write_done())
return -1;
buffer++;
len--;
}
return 0;
}
static int nor_erase(const struct spi_flash *flash, u32 offset, size_t len)
{
int sector_start = offset;
int sector_num = (u32)len / flash->sector_size;
while (sector_num) {
if (!sector_erase(sector_start)) {
sector_start += flash->sector_size;
sector_num--;
} else {
printk(BIOS_WARNING, "Erase failed at %#x!\n",
sector_start);
return -1;
}
}
return 0;
}
const struct spi_flash_ops spi_flash_ops = {
.read = nor_read,
.write = nor_write,
.erase = nor_erase,
};
int mtk_spi_flash_probe(const struct spi_slave *spi,
struct spi_flash *flash)
{
write32(&mt8192_nor->wrprot, SFLASH_COMMAND_ENABLE);
memcpy(&flash->spi, spi, sizeof(*spi));
flash->sector_size = 0x1000;
flash->erase_cmd = SECTOR_ERASE_CMD;
flash->size = CONFIG_ROM_SIZE;
flash->ops = &spi_flash_ops;
return 0;
}
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