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rtsx_pci_sdmmc.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/* Realtek PCI-Express SD/MMC Card Interface driver
*
* Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
*
* Author:
* Wei WANG <wei_wang@realsil.com.cn>
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/card.h>
#include <linux/rtsx_pci.h>
#include <asm/unaligned.h>
struct realtek_pci_sdmmc {
struct platform_device *pdev;
struct rtsx_pcr *pcr;
struct mmc_host *mmc;
struct mmc_request *mrq;
#define SDMMC_WORKQ_NAME "rtsx_pci_sdmmc_workq"
struct work_struct work;
struct mutex host_mutex;
u8 ssc_depth;
unsigned int clock;
bool vpclk;
bool double_clk;
bool eject;
bool initial_mode;
int power_state;
#define SDMMC_POWER_ON 1
#define SDMMC_POWER_OFF 0
int sg_count;
s32 cookie;
int cookie_sg_count;
bool using_cookie;
};
static inline struct device *sdmmc_dev(struct realtek_pci_sdmmc *host)
{
return &(host->pdev->dev);
}
static inline void sd_clear_error(struct realtek_pci_sdmmc *host)
{
rtsx_pci_write_register(host->pcr, CARD_STOP,
SD_STOP | SD_CLR_ERR, SD_STOP | SD_CLR_ERR);
}
#ifdef DEBUG
static void dump_reg_range(struct realtek_pci_sdmmc *host, u16 start, u16 end)
{
u16 len = end - start + 1;
int i;
u8 data[8];
for (i = 0; i < len; i += 8) {
int j;
int n = min(8, len - i);
memset(&data, 0, sizeof(data));
for (j = 0; j < n; j++)
rtsx_pci_read_register(host->pcr, start + i + j,
data + j);
dev_dbg(sdmmc_dev(host), "0x%04X(%d): %8ph\n",
start + i, n, data);
}
}
static void sd_print_debug_regs(struct realtek_pci_sdmmc *host)
{
dump_reg_range(host, 0xFDA0, 0xFDB3);
dump_reg_range(host, 0xFD52, 0xFD69);
}
#else
#define sd_print_debug_regs(host)
#endif /* DEBUG */
static inline int sd_get_cd_int(struct realtek_pci_sdmmc *host)
{
return rtsx_pci_readl(host->pcr, RTSX_BIPR) & SD_EXIST;
}
static void sd_cmd_set_sd_cmd(struct rtsx_pcr *pcr, struct mmc_command *cmd)
{
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CMD0, 0xFF,
SD_CMD_START | cmd->opcode);
rtsx_pci_write_be32(pcr, SD_CMD1, cmd->arg);
}
static void sd_cmd_set_data_len(struct rtsx_pcr *pcr, u16 blocks, u16 blksz)
{
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_BLOCK_CNT_L, 0xFF, blocks);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_BLOCK_CNT_H, 0xFF, blocks >> 8);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, blksz);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_BYTE_CNT_H, 0xFF, blksz >> 8);
}
static int sd_response_type(struct mmc_command *cmd)
{
switch (mmc_resp_type(cmd)) {
case MMC_RSP_NONE:
return SD_RSP_TYPE_R0;
case MMC_RSP_R1:
return SD_RSP_TYPE_R1;
case MMC_RSP_R1_NO_CRC:
return SD_RSP_TYPE_R1 | SD_NO_CHECK_CRC7;
case MMC_RSP_R1B:
return SD_RSP_TYPE_R1b;
case MMC_RSP_R2:
return SD_RSP_TYPE_R2;
case MMC_RSP_R3:
return SD_RSP_TYPE_R3;
default:
return -EINVAL;
}
}
static int sd_status_index(int resp_type)
{
if (resp_type == SD_RSP_TYPE_R0)
return 0;
else if (resp_type == SD_RSP_TYPE_R2)
return 16;
return 5;
}
/*
* sd_pre_dma_transfer - do dma_map_sg() or using cookie
*
* @pre: if called in pre_req()
* return:
* 0 - do dma_map_sg()
* 1 - using cookie
*/
static int sd_pre_dma_transfer(struct realtek_pci_sdmmc *host,
struct mmc_data *data, bool pre)
{
struct rtsx_pcr *pcr = host->pcr;
int read = data->flags & MMC_DATA_READ;
int count = 0;
int using_cookie = 0;
if (!pre && data->host_cookie && data->host_cookie != host->cookie) {
dev_err(sdmmc_dev(host),
"error: data->host_cookie = %d, host->cookie = %d\n",
data->host_cookie, host->cookie);
data->host_cookie = 0;
}
if (pre || data->host_cookie != host->cookie) {
count = rtsx_pci_dma_map_sg(pcr, data->sg, data->sg_len, read);
} else {
count = host->cookie_sg_count;
using_cookie = 1;
}
if (pre) {
host->cookie_sg_count = count;
if (++host->cookie < 0)
host->cookie = 1;
data->host_cookie = host->cookie;
} else {
host->sg_count = count;
}
return using_cookie;
}
static void sdmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct realtek_pci_sdmmc *host = mmc_priv(mmc);
struct mmc_data *data = mrq->data;
if (data->host_cookie) {
dev_err(sdmmc_dev(host),
"error: reset data->host_cookie = %d\n",
data->host_cookie);
data->host_cookie = 0;
}
sd_pre_dma_transfer(host, data, true);
dev_dbg(sdmmc_dev(host), "pre dma sg: %d\n", host->cookie_sg_count);
}
static void sdmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
int err)
{
struct realtek_pci_sdmmc *host = mmc_priv(mmc);
struct rtsx_pcr *pcr = host->pcr;
struct mmc_data *data = mrq->data;
int read = data->flags & MMC_DATA_READ;
rtsx_pci_dma_unmap_sg(pcr, data->sg, data->sg_len, read);
data->host_cookie = 0;
}
static void sd_send_cmd_get_rsp(struct realtek_pci_sdmmc *host,
struct mmc_command *cmd)
{
struct rtsx_pcr *pcr = host->pcr;
u8 cmd_idx = (u8)cmd->opcode;
u32 arg = cmd->arg;
int err = 0;
int timeout = 100;
int i;
u8 *ptr;
int rsp_type;
int stat_idx;
bool clock_toggled = false;
dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
__func__, cmd_idx, arg);
rsp_type = sd_response_type(cmd);
if (rsp_type < 0)
goto out;
stat_idx = sd_status_index(rsp_type);
if (rsp_type == SD_RSP_TYPE_R1b)
timeout = cmd->busy_timeout ? cmd->busy_timeout : 3000;
if (cmd->opcode == SD_SWITCH_VOLTAGE) {
err = rtsx_pci_write_register(pcr, SD_BUS_STAT,
0xFF, SD_CLK_TOGGLE_EN);
if (err < 0)
goto out;
clock_toggled = true;
}
rtsx_pci_init_cmd(pcr);
sd_cmd_set_sd_cmd(pcr, cmd);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF, rsp_type);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_DATA_SOURCE,
0x01, PINGPONG_BUFFER);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER,
0xFF, SD_TM_CMD_RSP | SD_TRANSFER_START);
rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
SD_TRANSFER_END | SD_STAT_IDLE,
SD_TRANSFER_END | SD_STAT_IDLE);
if (rsp_type == SD_RSP_TYPE_R2) {
/* Read data from ping-pong buffer */
for (i = PPBUF_BASE2; i < PPBUF_BASE2 + 16; i++)
rtsx_pci_add_cmd(pcr, READ_REG_CMD, (u16)i, 0, 0);
} else if (rsp_type != SD_RSP_TYPE_R0) {
/* Read data from SD_CMDx registers */
for (i = SD_CMD0; i <= SD_CMD4; i++)
rtsx_pci_add_cmd(pcr, READ_REG_CMD, (u16)i, 0, 0);
}
rtsx_pci_add_cmd(pcr, READ_REG_CMD, SD_STAT1, 0, 0);
err = rtsx_pci_send_cmd(pcr, timeout);
if (err < 0) {
sd_print_debug_regs(host);
sd_clear_error(host);
dev_dbg(sdmmc_dev(host),
"rtsx_pci_send_cmd error (err = %d)\n", err);
goto out;
}
if (rsp_type == SD_RSP_TYPE_R0) {
err = 0;
goto out;
}
/* Eliminate returned value of CHECK_REG_CMD */
ptr = rtsx_pci_get_cmd_data(pcr) + 1;
/* Check (Start,Transmission) bit of Response */
if ((ptr[0] & 0xC0) != 0) {
err = -EILSEQ;
dev_dbg(sdmmc_dev(host), "Invalid response bit\n");
goto out;
}
/* Check CRC7 */
if (!(rsp_type & SD_NO_CHECK_CRC7)) {
if (ptr[stat_idx] & SD_CRC7_ERR) {
err = -EILSEQ;
dev_dbg(sdmmc_dev(host), "CRC7 error\n");
goto out;
}
}
if (rsp_type == SD_RSP_TYPE_R2) {
/*
* The controller offloads the last byte {CRC-7, end bit 1'b1}
* of response type R2. Assign dummy CRC, 0, and end bit to the
* byte(ptr[16], goes into the LSB of resp[3] later).
*/
ptr[16] = 1;
for (i = 0; i < 4; i++) {
cmd->resp[i] = get_unaligned_be32(ptr + 1 + i * 4);
dev_dbg(sdmmc_dev(host), "cmd->resp[%d] = 0x%08x\n",
i, cmd->resp[i]);
}
} else {
cmd->resp[0] = get_unaligned_be32(ptr + 1);
dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
cmd->resp[0]);
}
out:
cmd->error = err;
if (err && clock_toggled)
rtsx_pci_write_register(pcr, SD_BUS_STAT,
SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0);
}
static int sd_read_data(struct realtek_pci_sdmmc *host, struct mmc_command *cmd,
u16 byte_cnt, u8 *buf, int buf_len, int timeout)
{
struct rtsx_pcr *pcr = host->pcr;
int err;
u8 trans_mode;
dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
__func__, cmd->opcode, cmd->arg);
if (!buf)
buf_len = 0;
if (cmd->opcode == MMC_SEND_TUNING_BLOCK)
trans_mode = SD_TM_AUTO_TUNING;
else
trans_mode = SD_TM_NORMAL_READ;
rtsx_pci_init_cmd(pcr);
sd_cmd_set_sd_cmd(pcr, cmd);
sd_cmd_set_data_len(pcr, 1, byte_cnt);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF,
SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_6);
if (trans_mode != SD_TM_AUTO_TUNING)
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
CARD_DATA_SOURCE, 0x01, PINGPONG_BUFFER);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER,
0xFF, trans_mode | SD_TRANSFER_START);
rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
SD_TRANSFER_END, SD_TRANSFER_END);
err = rtsx_pci_send_cmd(pcr, timeout);
if (err < 0) {
sd_print_debug_regs(host);
dev_dbg(sdmmc_dev(host),
"rtsx_pci_send_cmd fail (err = %d)\n", err);
return err;
}
if (buf && buf_len) {
err = rtsx_pci_read_ppbuf(pcr, buf, buf_len);
if (err < 0) {
dev_dbg(sdmmc_dev(host),
"rtsx_pci_read_ppbuf fail (err = %d)\n", err);
return err;
}
}
return 0;
}
static int sd_write_data(struct realtek_pci_sdmmc *host,
struct mmc_command *cmd, u16 byte_cnt, u8 *buf, int buf_len,
int timeout)
{
struct rtsx_pcr *pcr = host->pcr;
int err;
dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
__func__, cmd->opcode, cmd->arg);
if (!buf)
buf_len = 0;
sd_send_cmd_get_rsp(host, cmd);
if (cmd->error)
return cmd->error;
if (buf && buf_len) {
err = rtsx_pci_write_ppbuf(pcr, buf, buf_len);
if (err < 0) {
dev_dbg(sdmmc_dev(host),
"rtsx_pci_write_ppbuf fail (err = %d)\n", err);
return err;
}
}
rtsx_pci_init_cmd(pcr);
sd_cmd_set_data_len(pcr, 1, byte_cnt);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF,
SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_0);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
SD_TRANSFER_START | SD_TM_AUTO_WRITE_3);
rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
SD_TRANSFER_END, SD_TRANSFER_END);
err = rtsx_pci_send_cmd(pcr, timeout);
if (err < 0) {
sd_print_debug_regs(host);
dev_dbg(sdmmc_dev(host),
"rtsx_pci_send_cmd fail (err = %d)\n", err);
return err;
}
return 0;
}
static int sd_read_long_data(struct realtek_pci_sdmmc *host,
struct mmc_request *mrq)
{
struct rtsx_pcr *pcr = host->pcr;
struct mmc_host *mmc = host->mmc;
struct mmc_card *card = mmc->card;
struct mmc_command *cmd = mrq->cmd;
struct mmc_data *data = mrq->data;
int uhs = mmc_card_uhs(card);
u8 cfg2 = 0;
int err;
int resp_type;
size_t data_len = data->blksz * data->blocks;
dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
__func__, cmd->opcode, cmd->arg);
resp_type = sd_response_type(cmd);
if (resp_type < 0)
return resp_type;
if (!uhs)
cfg2 |= SD_NO_CHECK_WAIT_CRC_TO;
rtsx_pci_init_cmd(pcr);
sd_cmd_set_sd_cmd(pcr, cmd);
sd_cmd_set_data_len(pcr, data->blocks, data->blksz);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, IRQSTAT0,
DMA_DONE_INT, DMA_DONE_INT);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC3,
0xFF, (u8)(data_len >> 24));
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC2,
0xFF, (u8)(data_len >> 16));
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC1,
0xFF, (u8)(data_len >> 8));
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC0, 0xFF, (u8)data_len);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMACTL,
0x03 | DMA_PACK_SIZE_MASK,
DMA_DIR_FROM_CARD | DMA_EN | DMA_512);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_DATA_SOURCE,
0x01, RING_BUFFER);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF, cfg2 | resp_type);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
SD_TRANSFER_START | SD_TM_AUTO_READ_2);
rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
SD_TRANSFER_END, SD_TRANSFER_END);
rtsx_pci_send_cmd_no_wait(pcr);
err = rtsx_pci_dma_transfer(pcr, data->sg, host->sg_count, 1, 10000);
if (err < 0) {
sd_print_debug_regs(host);
sd_clear_error(host);
return err;
}
return 0;
}
static int sd_write_long_data(struct realtek_pci_sdmmc *host,
struct mmc_request *mrq)
{
struct rtsx_pcr *pcr = host->pcr;
struct mmc_host *mmc = host->mmc;
struct mmc_card *card = mmc->card;
struct mmc_command *cmd = mrq->cmd;
struct mmc_data *data = mrq->data;
int uhs = mmc_card_uhs(card);
u8 cfg2;
int err;
size_t data_len = data->blksz * data->blocks;
sd_send_cmd_get_rsp(host, cmd);
if (cmd->error)
return cmd->error;
dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
__func__, cmd->opcode, cmd->arg);
cfg2 = SD_NO_CALCULATE_CRC7 | SD_CHECK_CRC16 |
SD_NO_WAIT_BUSY_END | SD_NO_CHECK_CRC7 | SD_RSP_LEN_0;
if (!uhs)
cfg2 |= SD_NO_CHECK_WAIT_CRC_TO;
rtsx_pci_init_cmd(pcr);
sd_cmd_set_data_len(pcr, data->blocks, data->blksz);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, IRQSTAT0,
DMA_DONE_INT, DMA_DONE_INT);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC3,
0xFF, (u8)(data_len >> 24));
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC2,
0xFF, (u8)(data_len >> 16));
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC1,
0xFF, (u8)(data_len >> 8));
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC0, 0xFF, (u8)data_len);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMACTL,
0x03 | DMA_PACK_SIZE_MASK,
DMA_DIR_TO_CARD | DMA_EN | DMA_512);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_DATA_SOURCE,
0x01, RING_BUFFER);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF, cfg2);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
SD_TRANSFER_START | SD_TM_AUTO_WRITE_3);
rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
SD_TRANSFER_END, SD_TRANSFER_END);
rtsx_pci_send_cmd_no_wait(pcr);
err = rtsx_pci_dma_transfer(pcr, data->sg, host->sg_count, 0, 10000);
if (err < 0) {
sd_clear_error(host);
return err;
}
return 0;
}
static int sd_rw_multi(struct realtek_pci_sdmmc *host, struct mmc_request *mrq)
{
struct mmc_data *data = mrq->data;
if (host->sg_count < 0) {
data->error = host->sg_count;
dev_dbg(sdmmc_dev(host), "%s: sg_count = %d is invalid\n",
__func__, host->sg_count);
return data->error;
}
if (data->flags & MMC_DATA_READ)
return sd_read_long_data(host, mrq);
return sd_write_long_data(host, mrq);
}
static inline void sd_enable_initial_mode(struct realtek_pci_sdmmc *host)
{
rtsx_pci_write_register(host->pcr, SD_CFG1,
SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_128);
}
static inline void sd_disable_initial_mode(struct realtek_pci_sdmmc *host)
{
rtsx_pci_write_register(host->pcr, SD_CFG1,
SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_0);
}
static void sd_normal_rw(struct realtek_pci_sdmmc *host,
struct mmc_request *mrq)
{
struct mmc_command *cmd = mrq->cmd;
struct mmc_data *data = mrq->data;
u8 *buf;
buf = kzalloc(data->blksz, GFP_NOIO);
if (!buf) {
cmd->error = -ENOMEM;
return;
}
if (data->flags & MMC_DATA_READ) {
if (host->initial_mode)
sd_disable_initial_mode(host);
cmd->error = sd_read_data(host, cmd, (u16)data->blksz, buf,
data->blksz, 200);
if (host->initial_mode)
sd_enable_initial_mode(host);
sg_copy_from_buffer(data->sg, data->sg_len, buf, data->blksz);
} else {
sg_copy_to_buffer(data->sg, data->sg_len, buf, data->blksz);
cmd->error = sd_write_data(host, cmd, (u16)data->blksz, buf,
data->blksz, 200);
}
kfree(buf);
}
static int sd_change_phase(struct realtek_pci_sdmmc *host,
u8 sample_point, bool rx)
{
struct rtsx_pcr *pcr = host->pcr;
u16 SD_VP_CTL = 0;
dev_dbg(sdmmc_dev(host), "%s(%s): sample_point = %d\n",
__func__, rx ? "RX" : "TX", sample_point);
rtsx_pci_write_register(pcr, CLK_CTL, CHANGE_CLK, CHANGE_CLK);
if (rx) {
SD_VP_CTL = SD_VPRX_CTL;
rtsx_pci_write_register(pcr, SD_VPRX_CTL,
PHASE_SELECT_MASK, sample_point);
} else {
SD_VP_CTL = SD_VPTX_CTL;
rtsx_pci_write_register(pcr, SD_VPTX_CTL,
PHASE_SELECT_MASK, sample_point);
}
rtsx_pci_write_register(pcr, SD_VP_CTL, PHASE_NOT_RESET, 0);
rtsx_pci_write_register(pcr, SD_VP_CTL, PHASE_NOT_RESET,
PHASE_NOT_RESET);
rtsx_pci_write_register(pcr, CLK_CTL, CHANGE_CLK, 0);
rtsx_pci_write_register(pcr, SD_CFG1, SD_ASYNC_FIFO_NOT_RST, 0);
return 0;
}
static inline u32 test_phase_bit(u32 phase_map, unsigned int bit)
{
bit %= RTSX_PHASE_MAX;
return phase_map & (1 << bit);
}
static int sd_get_phase_len(u32 phase_map, unsigned int start_bit)
{
int i;
for (i = 0; i < RTSX_PHASE_MAX; i++) {
if (test_phase_bit(phase_map, start_bit + i) == 0)
return i;
}
return RTSX_PHASE_MAX;
}
static u8 sd_search_final_phase(struct realtek_pci_sdmmc *host, u32 phase_map)
{
int start = 0, len = 0;
int start_final = 0, len_final = 0;
u8 final_phase = 0xFF;
if (phase_map == 0) {
dev_err(sdmmc_dev(host), "phase error: [map:%x]\n", phase_map);
return final_phase;
}
while (start < RTSX_PHASE_MAX) {
len = sd_get_phase_len(phase_map, start);
if (len_final < len) {
start_final = start;
len_final = len;
}
start += len ? len : 1;
}
final_phase = (start_final + len_final / 2) % RTSX_PHASE_MAX;
dev_dbg(sdmmc_dev(host), "phase: [map:%x] [maxlen:%d] [final:%d]\n",
phase_map, len_final, final_phase);
return final_phase;
}
static void sd_wait_data_idle(struct realtek_pci_sdmmc *host)
{
int i;
u8 val = 0;
for (i = 0; i < 100; i++) {
rtsx_pci_read_register(host->pcr, SD_DATA_STATE, &val);
if (val & SD_DATA_IDLE)
return;
udelay(100);
}
}
static int sd_tuning_rx_cmd(struct realtek_pci_sdmmc *host,
u8 opcode, u8 sample_point)
{
int err;
struct mmc_command cmd = {};
struct rtsx_pcr *pcr = host->pcr;
sd_change_phase(host, sample_point, true);
rtsx_pci_write_register(pcr, SD_CFG3, SD_RSP_80CLK_TIMEOUT_EN,
SD_RSP_80CLK_TIMEOUT_EN);
cmd.opcode = opcode;
err = sd_read_data(host, &cmd, 0x40, NULL, 0, 100);
if (err < 0) {
/* Wait till SD DATA IDLE */
sd_wait_data_idle(host);
sd_clear_error(host);
rtsx_pci_write_register(pcr, SD_CFG3,
SD_RSP_80CLK_TIMEOUT_EN, 0);
return err;
}
rtsx_pci_write_register(pcr, SD_CFG3, SD_RSP_80CLK_TIMEOUT_EN, 0);
return 0;
}
static int sd_tuning_phase(struct realtek_pci_sdmmc *host,
u8 opcode, u32 *phase_map)
{
int err, i;
u32 raw_phase_map = 0;
for (i = 0; i < RTSX_PHASE_MAX; i++) {
err = sd_tuning_rx_cmd(host, opcode, (u8)i);
if (err == 0)
raw_phase_map |= 1 << i;
}
if (phase_map)
*phase_map = raw_phase_map;
return 0;
}
static int sd_tuning_rx(struct realtek_pci_sdmmc *host, u8 opcode)
{
int err, i;
u32 raw_phase_map[RX_TUNING_CNT] = {0}, phase_map;
u8 final_phase;
for (i = 0; i < RX_TUNING_CNT; i++) {
err = sd_tuning_phase(host, opcode, &(raw_phase_map[i]));
if (err < 0)
return err;
if (raw_phase_map[i] == 0)
break;
}
phase_map = 0xFFFFFFFF;
for (i = 0; i < RX_TUNING_CNT; i++) {
dev_dbg(sdmmc_dev(host), "RX raw_phase_map[%d] = 0x%08x\n",
i, raw_phase_map[i]);
phase_map &= raw_phase_map[i];
}
dev_dbg(sdmmc_dev(host), "RX phase_map = 0x%08x\n", phase_map);
if (phase_map) {
final_phase = sd_search_final_phase(host, phase_map);
if (final_phase == 0xFF)
return -EINVAL;
err = sd_change_phase(host, final_phase, true);
if (err < 0)
return err;
} else {
return -EINVAL;
}
return 0;
}
static inline int sdio_extblock_cmd(struct mmc_command *cmd,
struct mmc_data *data)
{
return (cmd->opcode == SD_IO_RW_EXTENDED) && (data->blksz == 512);
}
static inline int sd_rw_cmd(struct mmc_command *cmd)
{
return mmc_op_multi(cmd->opcode) ||
(cmd->opcode == MMC_READ_SINGLE_BLOCK) ||
(cmd->opcode == MMC_WRITE_BLOCK);
}
static void sd_request(struct work_struct *work)
{
struct realtek_pci_sdmmc *host = container_of(work,
struct realtek_pci_sdmmc, work);
struct rtsx_pcr *pcr = host->pcr;
struct mmc_host *mmc = host->mmc;
struct mmc_request *mrq = host->mrq;
struct mmc_command *cmd = mrq->cmd;
struct mmc_data *data = mrq->data;
unsigned int data_size = 0;
int err;
if (host->eject || !sd_get_cd_int(host)) {
cmd->error = -ENOMEDIUM;
goto finish;
}
err = rtsx_pci_card_exclusive_check(host->pcr, RTSX_SD_CARD);
if (err) {
cmd->error = err;
goto finish;
}
mutex_lock(&pcr->pcr_mutex);
rtsx_pci_start_run(pcr);
rtsx_pci_switch_clock(pcr, host->clock, host->ssc_depth,
host->initial_mode, host->double_clk, host->vpclk);
rtsx_pci_write_register(pcr, CARD_SELECT, 0x07, SD_MOD_SEL);
rtsx_pci_write_register(pcr, CARD_SHARE_MODE,
CARD_SHARE_MASK, CARD_SHARE_48_SD);
mutex_lock(&host->host_mutex);
host->mrq = mrq;
mutex_unlock(&host->host_mutex);
if (mrq->data)
data_size = data->blocks * data->blksz;
if (!data_size) {
sd_send_cmd_get_rsp(host, cmd);
} else if (sd_rw_cmd(cmd) || sdio_extblock_cmd(cmd, data)) {
cmd->error = sd_rw_multi(host, mrq);
if (!host->using_cookie)
sdmmc_post_req(host->mmc, host->mrq, 0);
if (mmc_op_multi(cmd->opcode) && mrq->stop)
sd_send_cmd_get_rsp(host, mrq->stop);
} else {
sd_normal_rw(host, mrq);
}
if (mrq->data) {
if (cmd->error || data->error)
data->bytes_xfered = 0;
else
data->bytes_xfered = data->blocks * data->blksz;
}
mutex_unlock(&pcr->pcr_mutex);
finish:
if (cmd->error) {
dev_dbg(sdmmc_dev(host), "CMD %d 0x%08x error(%d)\n",
cmd->opcode, cmd->arg, cmd->error);
}
mutex_lock(&host->host_mutex);
host->mrq = NULL;
mutex_unlock(&host->host_mutex);
mmc_request_done(mmc, mrq);
}
static void sdmmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct realtek_pci_sdmmc *host = mmc_priv(mmc);
struct mmc_data *data = mrq->data;
mutex_lock(&host->host_mutex);
host->mrq = mrq;
mutex_unlock(&host->host_mutex);
if (sd_rw_cmd(mrq->cmd) || sdio_extblock_cmd(mrq->cmd, data))
host->using_cookie = sd_pre_dma_transfer(host, data, false);
schedule_work(&host->work);
}
static int sd_set_bus_width(struct realtek_pci_sdmmc *host,
unsigned char bus_width)
{
int err = 0;
u8 width[] = {
[MMC_BUS_WIDTH_1] = SD_BUS_WIDTH_1BIT,
[MMC_BUS_WIDTH_4] = SD_BUS_WIDTH_4BIT,
[MMC_BUS_WIDTH_8] = SD_BUS_WIDTH_8BIT,
};
if (bus_width <= MMC_BUS_WIDTH_8)
err = rtsx_pci_write_register(host->pcr, SD_CFG1,
0x03, width[bus_width]);
return err;
}
static int sd_power_on(struct realtek_pci_sdmmc *host)
{
struct rtsx_pcr *pcr = host->pcr;
int err;
if (host->power_state == SDMMC_POWER_ON)
return 0;
rtsx_pci_init_cmd(pcr);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_SELECT, 0x07, SD_MOD_SEL);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_SHARE_MODE,
CARD_SHARE_MASK, CARD_SHARE_48_SD);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_EN,
SD_CLK_EN, SD_CLK_EN);
err = rtsx_pci_send_cmd(pcr, 100);
if (err < 0)
return err;
err = rtsx_pci_card_pull_ctl_enable(pcr, RTSX_SD_CARD);
if (err < 0)
return err;
err = rtsx_pci_card_power_on(pcr, RTSX_SD_CARD);
if (err < 0)
return err;
err = rtsx_pci_write_register(pcr, CARD_OE, SD_OUTPUT_EN, SD_OUTPUT_EN);
if (err < 0)
return err;
host->power_state = SDMMC_POWER_ON;
return 0;
}
static int sd_power_off(struct realtek_pci_sdmmc *host)
{
struct rtsx_pcr *pcr = host->pcr;
int err;
host->power_state = SDMMC_POWER_OFF;
rtsx_pci_init_cmd(pcr);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_EN, SD_CLK_EN, 0);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_OE, SD_OUTPUT_EN, 0);
err = rtsx_pci_send_cmd(pcr, 100);
if (err < 0)
return err;
err = rtsx_pci_card_power_off(pcr, RTSX_SD_CARD);
if (err < 0)
return err;
return rtsx_pci_card_pull_ctl_disable(pcr, RTSX_SD_CARD);
}
static int sd_set_power_mode(struct realtek_pci_sdmmc *host,
unsigned char power_mode)
{
int err;
if (power_mode == MMC_POWER_OFF)
err = sd_power_off(host);
else
err = sd_power_on(host);
return err;
}
static int sd_set_timing(struct realtek_pci_sdmmc *host, unsigned char timing)
{
struct rtsx_pcr *pcr = host->pcr;
int err = 0;
rtsx_pci_init_cmd(pcr);
switch (timing) {
case MMC_TIMING_UHS_SDR104:
case MMC_TIMING_UHS_SDR50:
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG1,
0x0C | SD_ASYNC_FIFO_NOT_RST,
SD_30_MODE | SD_ASYNC_FIFO_NOT_RST);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL,
CLK_LOW_FREQ, CLK_LOW_FREQ);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL, CLK_LOW_FREQ, 0);
break;
case MMC_TIMING_MMC_DDR52:
case MMC_TIMING_UHS_DDR50:
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG1,
0x0C | SD_ASYNC_FIFO_NOT_RST,
SD_DDR_MODE | SD_ASYNC_FIFO_NOT_RST);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL,
CLK_LOW_FREQ, CLK_LOW_FREQ);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL, CLK_LOW_FREQ, 0);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_PUSH_POINT_CTL,
DDR_VAR_TX_CMD_DAT, DDR_VAR_TX_CMD_DAT);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
DDR_VAR_RX_DAT | DDR_VAR_RX_CMD,
DDR_VAR_RX_DAT | DDR_VAR_RX_CMD);
break;