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// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/* Copyright(c) 2018-2019 Realtek Corporation
*/
#include <linux/iopoll.h>
#include "main.h"
#include "efuse.h"
#include "reg.h"
#include "debug.h"
#define RTW_EFUSE_BANK_WIFI 0x0
static void switch_efuse_bank(struct rtw_dev *rtwdev)
{
rtw_write32_mask(rtwdev, REG_LDO_EFUSE_CTRL, BIT_MASK_EFUSE_BANK_SEL,
RTW_EFUSE_BANK_WIFI);
}
#define invalid_efuse_header(hdr1, hdr2) \
((hdr1) == 0xff || (((hdr1) & 0x1f) == 0xf && (hdr2) == 0xff))
#define invalid_efuse_content(word_en, i) \
(((word_en) & BIT(i)) != 0x0)
#define get_efuse_blk_idx_2_byte(hdr1, hdr2) \
((((hdr2) & 0xf0) >> 1) | (((hdr1) >> 5) & 0x07))
#define get_efuse_blk_idx_1_byte(hdr1) \
(((hdr1) & 0xf0) >> 4)
#define block_idx_to_logical_idx(blk_idx, i) \
(((blk_idx) << 3) + ((i) << 1))
/* efuse header format
*
* | 7 5 4 0 | 7 4 3 0 | 15 8 7 0 |
* block[2:0] 0 1111 block[6:3] word_en[3:0] byte0 byte1
* | header 1 (optional) | header 2 | word N |
*
* word_en: 4 bits each word. 0 -> write; 1 -> not write
* N: 1~4, depends on word_en
*/
static int rtw_dump_logical_efuse_map(struct rtw_dev *rtwdev, u8 *phy_map,
u8 *log_map)
{
u32 physical_size = rtwdev->efuse.physical_size;
u32 protect_size = rtwdev->efuse.protect_size;
u32 logical_size = rtwdev->efuse.logical_size;
u32 phy_idx, log_idx;
u8 hdr1, hdr2;
u8 blk_idx;
u8 word_en;
int i;
for (phy_idx = 0; phy_idx < physical_size - protect_size;) {
hdr1 = phy_map[phy_idx];
hdr2 = phy_map[phy_idx + 1];
if (invalid_efuse_header(hdr1, hdr2))
break;
if ((hdr1 & 0x1f) == 0xf) {
/* 2-byte header format */
blk_idx = get_efuse_blk_idx_2_byte(hdr1, hdr2);
word_en = hdr2 & 0xf;
phy_idx += 2;
} else {
/* 1-byte header format */
blk_idx = get_efuse_blk_idx_1_byte(hdr1);
word_en = hdr1 & 0xf;
phy_idx += 1;
}
for (i = 0; i < 4; i++) {
if (invalid_efuse_content(word_en, i))
continue;
log_idx = block_idx_to_logical_idx(blk_idx, i);
if (phy_idx + 1 > physical_size - protect_size ||
log_idx + 1 > logical_size)
return -EINVAL;
log_map[log_idx] = phy_map[phy_idx];
log_map[log_idx + 1] = phy_map[phy_idx + 1];
phy_idx += 2;
}
}
return 0;
}
static int rtw_dump_physical_efuse_map(struct rtw_dev *rtwdev, u8 *map)
{
struct rtw_chip_info *chip = rtwdev->chip;
u32 size = rtwdev->efuse.physical_size;
u32 efuse_ctl;
u32 addr;
u32 cnt;
rtw_chip_efuse_grant_on(rtwdev);
switch_efuse_bank(rtwdev);
/* disable 2.5V LDO */
chip->ops->cfg_ldo25(rtwdev, false);
efuse_ctl = rtw_read32(rtwdev, REG_EFUSE_CTRL);
for (addr = 0; addr < size; addr++) {
efuse_ctl &= ~(BIT_MASK_EF_DATA | BITS_EF_ADDR);
efuse_ctl |= (addr & BIT_MASK_EF_ADDR) << BIT_SHIFT_EF_ADDR;
rtw_write32(rtwdev, REG_EFUSE_CTRL, efuse_ctl & (~BIT_EF_FLAG));
cnt = 1000000;
do {
udelay(1);
efuse_ctl = rtw_read32(rtwdev, REG_EFUSE_CTRL);
if (--cnt == 0)
return -EBUSY;
} while (!(efuse_ctl & BIT_EF_FLAG));
*(map + addr) = (u8)(efuse_ctl & BIT_MASK_EF_DATA);
}
rtw_chip_efuse_grant_off(rtwdev);
return 0;
}
int rtw_read8_physical_efuse(struct rtw_dev *rtwdev, u16 addr, u8 *data)
{
u32 efuse_ctl;
int ret;
rtw_write32_mask(rtwdev, REG_EFUSE_CTRL, 0x3ff00, addr);
rtw_write32_clr(rtwdev, REG_EFUSE_CTRL, BIT_EF_FLAG);
ret = read_poll_timeout(rtw_read32, efuse_ctl, efuse_ctl & BIT_EF_FLAG,
1000, 100000, false, rtwdev, REG_EFUSE_CTRL);
if (ret) {
*data = EFUSE_READ_FAIL;
return ret;
}
*data = rtw_read8(rtwdev, REG_EFUSE_CTRL);
return 0;
}
EXPORT_SYMBOL(rtw_read8_physical_efuse);
int rtw_parse_efuse_map(struct rtw_dev *rtwdev)
{
struct rtw_chip_info *chip = rtwdev->chip;
struct rtw_efuse *efuse = &rtwdev->efuse;
u32 phy_size = efuse->physical_size;
u32 log_size = efuse->logical_size;
u8 *phy_map = NULL;
u8 *log_map = NULL;
int ret = 0;
phy_map = kmalloc(phy_size, GFP_KERNEL);
log_map = kmalloc(log_size, GFP_KERNEL);
if (!phy_map || !log_map) {
ret = -ENOMEM;
goto out_free;
}
ret = rtw_dump_physical_efuse_map(rtwdev, phy_map);
if (ret) {
rtw_err(rtwdev, "failed to dump efuse physical map\n");
goto out_free;
}
memset(log_map, 0xff, log_size);
ret = rtw_dump_logical_efuse_map(rtwdev, phy_map, log_map);
if (ret) {
rtw_err(rtwdev, "failed to dump efuse logical map\n");
goto out_free;
}
ret = chip->ops->read_efuse(rtwdev, log_map);
if (ret) {
rtw_err(rtwdev, "failed to read efuse map\n");
goto out_free;
}
out_free:
kfree(log_map);
kfree(phy_map);
return ret;
}
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