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linux_dsm_epyc7002/drivers/mmc/host/meson-gx-mmc.c
Jerome Brunet f50b7ac5e4 mmc: meson-gx: add signal resampling tuning 
Use signal resampling tuning for the UHS and HS200 modes.
Instead of trying to get the *best* resampling setting with complex
window calculation, we just stop on the first working setting.

If the tuning setting later proves unstable, we will just continue the
tuning where we left it.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2019-05-06 11:55:39 +02:00

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/*
* Amlogic SD/eMMC driver for the GX/S905 family SoCs
*
* Copyright (c) 2016 BayLibre, SAS.
* Author: Kevin Hilman <khilman@baylibre.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
* The full GNU General Public License is included in this distribution
* in the file called COPYING.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/iopoll.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/ioport.h>
#include <linux/dma-mapping.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/interrupt.h>
#include <linux/bitfield.h>
#include <linux/pinctrl/consumer.h>
#define DRIVER_NAME "meson-gx-mmc"
#define SD_EMMC_CLOCK 0x0
#define CLK_DIV_MASK GENMASK(5, 0)
#define CLK_SRC_MASK GENMASK(7, 6)
#define CLK_CORE_PHASE_MASK GENMASK(9, 8)
#define CLK_TX_PHASE_MASK GENMASK(11, 10)
#define CLK_RX_PHASE_MASK GENMASK(13, 12)
#define CLK_PHASE_0 0
#define CLK_PHASE_180 2
#define CLK_V2_TX_DELAY_MASK GENMASK(19, 16)
#define CLK_V2_RX_DELAY_MASK GENMASK(23, 20)
#define CLK_V2_ALWAYS_ON BIT(24)
#define CLK_V3_TX_DELAY_MASK GENMASK(21, 16)
#define CLK_V3_RX_DELAY_MASK GENMASK(27, 22)
#define CLK_V3_ALWAYS_ON BIT(28)
#define CLK_TX_DELAY_MASK(h) (h->data->tx_delay_mask)
#define CLK_RX_DELAY_MASK(h) (h->data->rx_delay_mask)
#define CLK_ALWAYS_ON(h) (h->data->always_on)
#define SD_EMMC_DELAY 0x4
#define SD_EMMC_ADJUST 0x8
#define ADJUST_ADJ_DELAY_MASK GENMASK(21, 16)
#define ADJUST_DS_EN BIT(15)
#define ADJUST_ADJ_EN BIT(13)
#define SD_EMMC_DELAY1 0x4
#define SD_EMMC_DELAY2 0x8
#define SD_EMMC_V3_ADJUST 0xc
#define SD_EMMC_CALOUT 0x10
#define SD_EMMC_START 0x40
#define START_DESC_INIT BIT(0)
#define START_DESC_BUSY BIT(1)
#define START_DESC_ADDR_MASK GENMASK(31, 2)
#define SD_EMMC_CFG 0x44
#define CFG_BUS_WIDTH_MASK GENMASK(1, 0)
#define CFG_BUS_WIDTH_1 0x0
#define CFG_BUS_WIDTH_4 0x1
#define CFG_BUS_WIDTH_8 0x2
#define CFG_DDR BIT(2)
#define CFG_BLK_LEN_MASK GENMASK(7, 4)
#define CFG_RESP_TIMEOUT_MASK GENMASK(11, 8)
#define CFG_RC_CC_MASK GENMASK(15, 12)
#define CFG_STOP_CLOCK BIT(22)
#define CFG_CLK_ALWAYS_ON BIT(18)
#define CFG_CHK_DS BIT(20)
#define CFG_AUTO_CLK BIT(23)
#define CFG_ERR_ABORT BIT(27)
#define SD_EMMC_STATUS 0x48
#define STATUS_BUSY BIT(31)
#define STATUS_DESC_BUSY BIT(30)
#define STATUS_DATI GENMASK(23, 16)
#define SD_EMMC_IRQ_EN 0x4c
#define IRQ_RXD_ERR_MASK GENMASK(7, 0)
#define IRQ_TXD_ERR BIT(8)
#define IRQ_DESC_ERR BIT(9)
#define IRQ_RESP_ERR BIT(10)
#define IRQ_CRC_ERR \
(IRQ_RXD_ERR_MASK | IRQ_TXD_ERR | IRQ_DESC_ERR | IRQ_RESP_ERR)
#define IRQ_RESP_TIMEOUT BIT(11)
#define IRQ_DESC_TIMEOUT BIT(12)
#define IRQ_TIMEOUTS \
(IRQ_RESP_TIMEOUT | IRQ_DESC_TIMEOUT)
#define IRQ_END_OF_CHAIN BIT(13)
#define IRQ_RESP_STATUS BIT(14)
#define IRQ_SDIO BIT(15)
#define IRQ_EN_MASK \
(IRQ_CRC_ERR | IRQ_TIMEOUTS | IRQ_END_OF_CHAIN | IRQ_RESP_STATUS |\
IRQ_SDIO)
#define SD_EMMC_CMD_CFG 0x50
#define SD_EMMC_CMD_ARG 0x54
#define SD_EMMC_CMD_DAT 0x58
#define SD_EMMC_CMD_RSP 0x5c
#define SD_EMMC_CMD_RSP1 0x60
#define SD_EMMC_CMD_RSP2 0x64
#define SD_EMMC_CMD_RSP3 0x68
#define SD_EMMC_RXD 0x94
#define SD_EMMC_TXD 0x94
#define SD_EMMC_LAST_REG SD_EMMC_TXD
#define SD_EMMC_CFG_BLK_SIZE 512 /* internal buffer max: 512 bytes */
#define SD_EMMC_CFG_RESP_TIMEOUT 256 /* in clock cycles */
#define SD_EMMC_CMD_TIMEOUT 1024 /* in ms */
#define SD_EMMC_CMD_TIMEOUT_DATA 4096 /* in ms */
#define SD_EMMC_CFG_CMD_GAP 16 /* in clock cycles */
#define SD_EMMC_DESC_BUF_LEN PAGE_SIZE
#define SD_EMMC_PRE_REQ_DONE BIT(0)
#define SD_EMMC_DESC_CHAIN_MODE BIT(1)
#define MUX_CLK_NUM_PARENTS 2
struct meson_mmc_data {
unsigned int tx_delay_mask;
unsigned int rx_delay_mask;
unsigned int always_on;
unsigned int adjust;
};
struct sd_emmc_desc {
u32 cmd_cfg;
u32 cmd_arg;
u32 cmd_data;
u32 cmd_resp;
};
struct meson_host {
struct device *dev;
struct meson_mmc_data *data;
struct mmc_host *mmc;
struct mmc_command *cmd;
void __iomem *regs;
struct clk *core_clk;
struct clk *mux_clk;
struct clk *mmc_clk;
unsigned long req_rate;
bool ddr;
struct pinctrl *pinctrl;
struct pinctrl_state *pins_default;
struct pinctrl_state *pins_clk_gate;
unsigned int bounce_buf_size;
void *bounce_buf;
dma_addr_t bounce_dma_addr;
struct sd_emmc_desc *descs;
dma_addr_t descs_dma_addr;
int irq;
bool vqmmc_enabled;
};
#define CMD_CFG_LENGTH_MASK GENMASK(8, 0)
#define CMD_CFG_BLOCK_MODE BIT(9)
#define CMD_CFG_R1B BIT(10)
#define CMD_CFG_END_OF_CHAIN BIT(11)
#define CMD_CFG_TIMEOUT_MASK GENMASK(15, 12)
#define CMD_CFG_NO_RESP BIT(16)
#define CMD_CFG_NO_CMD BIT(17)
#define CMD_CFG_DATA_IO BIT(18)
#define CMD_CFG_DATA_WR BIT(19)
#define CMD_CFG_RESP_NOCRC BIT(20)
#define CMD_CFG_RESP_128 BIT(21)
#define CMD_CFG_RESP_NUM BIT(22)
#define CMD_CFG_DATA_NUM BIT(23)
#define CMD_CFG_CMD_INDEX_MASK GENMASK(29, 24)
#define CMD_CFG_ERROR BIT(30)
#define CMD_CFG_OWNER BIT(31)
#define CMD_DATA_MASK GENMASK(31, 2)
#define CMD_DATA_BIG_ENDIAN BIT(1)
#define CMD_DATA_SRAM BIT(0)
#define CMD_RESP_MASK GENMASK(31, 1)
#define CMD_RESP_SRAM BIT(0)
static unsigned int meson_mmc_get_timeout_msecs(struct mmc_data *data)
{
unsigned int timeout = data->timeout_ns / NSEC_PER_MSEC;
if (!timeout)
return SD_EMMC_CMD_TIMEOUT_DATA;
timeout = roundup_pow_of_two(timeout);
return min(timeout, 32768U); /* max. 2^15 ms */
}
static struct mmc_command *meson_mmc_get_next_command(struct mmc_command *cmd)
{
if (cmd->opcode == MMC_SET_BLOCK_COUNT && !cmd->error)
return cmd->mrq->cmd;
else if (mmc_op_multi(cmd->opcode) &&
(!cmd->mrq->sbc || cmd->error || cmd->data->error))
return cmd->mrq->stop;
else
return NULL;
}
static void meson_mmc_get_transfer_mode(struct mmc_host *mmc,
struct mmc_request *mrq)
{
struct mmc_data *data = mrq->data;
struct scatterlist *sg;
int i;
bool use_desc_chain_mode = true;
/*
* Broken SDIO with AP6255-based WiFi on Khadas VIM Pro has been
* reported. For some strange reason this occurs in descriptor
* chain mode only. So let's fall back to bounce buffer mode
* for command SD_IO_RW_EXTENDED.
*/
if (mrq->cmd->opcode == SD_IO_RW_EXTENDED)
return;
for_each_sg(data->sg, sg, data->sg_len, i)
/* check for 8 byte alignment */
if (sg->offset & 7) {
WARN_ONCE(1, "unaligned scatterlist buffer\n");
use_desc_chain_mode = false;
break;
}
if (use_desc_chain_mode)
data->host_cookie |= SD_EMMC_DESC_CHAIN_MODE;
}
static inline bool meson_mmc_desc_chain_mode(const struct mmc_data *data)
{
return data->host_cookie & SD_EMMC_DESC_CHAIN_MODE;
}
static inline bool meson_mmc_bounce_buf_read(const struct mmc_data *data)
{
return data && data->flags & MMC_DATA_READ &&
!meson_mmc_desc_chain_mode(data);
}
static void meson_mmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct mmc_data *data = mrq->data;
if (!data)
return;
meson_mmc_get_transfer_mode(mmc, mrq);
data->host_cookie |= SD_EMMC_PRE_REQ_DONE;
if (!meson_mmc_desc_chain_mode(data))
return;
data->sg_count = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len,
mmc_get_dma_dir(data));
if (!data->sg_count)
dev_err(mmc_dev(mmc), "dma_map_sg failed");
}
static void meson_mmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
int err)
{
struct mmc_data *data = mrq->data;
if (data && meson_mmc_desc_chain_mode(data) && data->sg_count)
dma_unmap_sg(mmc_dev(mmc), data->sg, data->sg_len,
mmc_get_dma_dir(data));
}
/*
* Gating the clock on this controller is tricky. It seems the mmc clock
* is also used by the controller. It may crash during some operation if the
* clock is stopped. The safest thing to do, whenever possible, is to keep
* clock running at stop it at the pad using the pinmux.
*/
static void meson_mmc_clk_gate(struct meson_host *host)
{
u32 cfg;
if (host->pins_clk_gate) {
pinctrl_select_state(host->pinctrl, host->pins_clk_gate);
} else {
/*
* If the pinmux is not provided - default to the classic and
* unsafe method
*/
cfg = readl(host->regs + SD_EMMC_CFG);
cfg |= CFG_STOP_CLOCK;
writel(cfg, host->regs + SD_EMMC_CFG);
}
}
static void meson_mmc_clk_ungate(struct meson_host *host)
{
u32 cfg;
if (host->pins_clk_gate)
pinctrl_select_state(host->pinctrl, host->pins_default);
/* Make sure the clock is not stopped in the controller */
cfg = readl(host->regs + SD_EMMC_CFG);
cfg &= ~CFG_STOP_CLOCK;
writel(cfg, host->regs + SD_EMMC_CFG);
}
static int meson_mmc_clk_set(struct meson_host *host, unsigned long rate,
bool ddr)
{
struct mmc_host *mmc = host->mmc;
int ret;
u32 cfg;
/* Same request - bail-out */
if (host->ddr == ddr && host->req_rate == rate)
return 0;
/* stop clock */
meson_mmc_clk_gate(host);
host->req_rate = 0;
mmc->actual_clock = 0;
/* return with clock being stopped */
if (!rate)
return 0;
/* Stop the clock during rate change to avoid glitches */
cfg = readl(host->regs + SD_EMMC_CFG);
cfg |= CFG_STOP_CLOCK;
writel(cfg, host->regs + SD_EMMC_CFG);
if (ddr) {
/* DDR modes require higher module clock */
rate <<= 1;
cfg |= CFG_DDR;
} else {
cfg &= ~CFG_DDR;
}
writel(cfg, host->regs + SD_EMMC_CFG);
host->ddr = ddr;
ret = clk_set_rate(host->mmc_clk, rate);
if (ret) {
dev_err(host->dev, "Unable to set cfg_div_clk to %lu. ret=%d\n",
rate, ret);
return ret;
}
host->req_rate = rate;
mmc->actual_clock = clk_get_rate(host->mmc_clk);
/* We should report the real output frequency of the controller */
if (ddr) {
host->req_rate >>= 1;
mmc->actual_clock >>= 1;
}
dev_dbg(host->dev, "clk rate: %u Hz\n", mmc->actual_clock);
if (rate != mmc->actual_clock)
dev_dbg(host->dev, "requested rate was %lu\n", rate);
/* (re)start clock */
meson_mmc_clk_ungate(host);
return 0;
}
/*
* The SD/eMMC IP block has an internal mux and divider used for
* generating the MMC clock. Use the clock framework to create and
* manage these clocks.
*/
static int meson_mmc_clk_init(struct meson_host *host)
{
struct clk_init_data init;
struct clk_mux *mux;
struct clk_divider *div;
char clk_name[32];
int i, ret = 0;
const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
const char *clk_parent[1];
u32 clk_reg;
/* init SD_EMMC_CLOCK to sane defaults w/min clock rate */
clk_reg = CLK_ALWAYS_ON(host);
clk_reg |= CLK_DIV_MASK;
clk_reg |= FIELD_PREP(CLK_CORE_PHASE_MASK, CLK_PHASE_180);
clk_reg |= FIELD_PREP(CLK_TX_PHASE_MASK, CLK_PHASE_0);
clk_reg |= FIELD_PREP(CLK_RX_PHASE_MASK, CLK_PHASE_0);
writel(clk_reg, host->regs + SD_EMMC_CLOCK);
/* get the mux parents */
for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
struct clk *clk;
char name[16];
snprintf(name, sizeof(name), "clkin%d", i);
clk = devm_clk_get(host->dev, name);
if (IS_ERR(clk)) {
if (clk != ERR_PTR(-EPROBE_DEFER))
dev_err(host->dev, "Missing clock %s\n", name);
return PTR_ERR(clk);
}
mux_parent_names[i] = __clk_get_name(clk);
}
/* create the mux */
mux = devm_kzalloc(host->dev, sizeof(*mux), GFP_KERNEL);
if (!mux)
return -ENOMEM;
snprintf(clk_name, sizeof(clk_name), "%s#mux", dev_name(host->dev));
init.name = clk_name;
init.ops = &clk_mux_ops;
init.flags = 0;
init.parent_names = mux_parent_names;
init.num_parents = MUX_CLK_NUM_PARENTS;
mux->reg = host->regs + SD_EMMC_CLOCK;
mux->shift = __ffs(CLK_SRC_MASK);
mux->mask = CLK_SRC_MASK >> mux->shift;
mux->hw.init = &init;
host->mux_clk = devm_clk_register(host->dev, &mux->hw);
if (WARN_ON(IS_ERR(host->mux_clk)))
return PTR_ERR(host->mux_clk);
/* create the divider */
div = devm_kzalloc(host->dev, sizeof(*div), GFP_KERNEL);
if (!div)
return -ENOMEM;
snprintf(clk_name, sizeof(clk_name), "%s#div", dev_name(host->dev));
init.name = clk_name;
init.ops = &clk_divider_ops;
init.flags = CLK_SET_RATE_PARENT;
clk_parent[0] = __clk_get_name(host->mux_clk);
init.parent_names = clk_parent;
init.num_parents = 1;
div->reg = host->regs + SD_EMMC_CLOCK;
div->shift = __ffs(CLK_DIV_MASK);
div->width = __builtin_popcountl(CLK_DIV_MASK);
div->hw.init = &init;
div->flags = CLK_DIVIDER_ONE_BASED;
host->mmc_clk = devm_clk_register(host->dev, &div->hw);
if (WARN_ON(IS_ERR(host->mmc_clk)))
return PTR_ERR(host->mmc_clk);
/* init SD_EMMC_CLOCK to sane defaults w/min clock rate */
host->mmc->f_min = clk_round_rate(host->mmc_clk, 400000);
ret = clk_set_rate(host->mmc_clk, host->mmc->f_min);
if (ret)
return ret;
return clk_prepare_enable(host->mmc_clk);
}
static void meson_mmc_disable_resampling(struct meson_host *host)
{
unsigned int val = readl(host->regs + host->data->adjust);
val &= ~ADJUST_ADJ_EN;
writel(val, host->regs + host->data->adjust);
}
static void meson_mmc_reset_resampling(struct meson_host *host)
{
unsigned int val;
meson_mmc_disable_resampling(host);
val = readl(host->regs + host->data->adjust);
val &= ~ADJUST_ADJ_DELAY_MASK;
writel(val, host->regs + host->data->adjust);
}
static int meson_mmc_resampling_tuning(struct mmc_host *mmc, u32 opcode)
{
struct meson_host *host = mmc_priv(mmc);
unsigned int val, dly, max_dly, i;
int ret;
/* Resampling is done using the source clock */
max_dly = DIV_ROUND_UP(clk_get_rate(host->mux_clk),
clk_get_rate(host->mmc_clk));
val = readl(host->regs + host->data->adjust);
val |= ADJUST_ADJ_EN;
writel(val, host->regs + host->data->adjust);
if (mmc->doing_retune)
dly = FIELD_GET(ADJUST_ADJ_DELAY_MASK, val) + 1;
else
dly = 0;
for (i = 0; i < max_dly; i++) {
val &= ~ADJUST_ADJ_DELAY_MASK;
val |= FIELD_PREP(ADJUST_ADJ_DELAY_MASK, (dly + i) % max_dly);
writel(val, host->regs + host->data->adjust);
ret = mmc_send_tuning(mmc, opcode, NULL);
if (!ret) {
dev_dbg(mmc_dev(mmc), "resampling delay: %u\n",
(dly + i) % max_dly);
return 0;
}
}
meson_mmc_reset_resampling(host);
return -EIO;
}
static int meson_mmc_prepare_ios_clock(struct meson_host *host,
struct mmc_ios *ios)
{
bool ddr;
switch (ios->timing) {
case MMC_TIMING_MMC_DDR52:
case MMC_TIMING_UHS_DDR50:
ddr = true;
break;
default:
ddr = false;
break;
}
return meson_mmc_clk_set(host, ios->clock, ddr);
}
static void meson_mmc_check_resampling(struct meson_host *host,
struct mmc_ios *ios)
{
switch (ios->timing) {
case MMC_TIMING_LEGACY:
case MMC_TIMING_MMC_HS:
case MMC_TIMING_SD_HS:
case MMC_TIMING_MMC_DDR52:
meson_mmc_disable_resampling(host);
break;
}
}
static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct meson_host *host = mmc_priv(mmc);
u32 bus_width, val;
int err;
/*
* GPIO regulator, only controls switching between 1v8 and
* 3v3, doesn't support MMC_POWER_OFF, MMC_POWER_ON.
*/
switch (ios->power_mode) {
case MMC_POWER_OFF:
if (!IS_ERR(mmc->supply.vmmc))
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
if (!IS_ERR(mmc->supply.vqmmc) && host->vqmmc_enabled) {
regulator_disable(mmc->supply.vqmmc);
host->vqmmc_enabled = false;
}
break;
case MMC_POWER_UP:
if (!IS_ERR(mmc->supply.vmmc))
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
break;
case MMC_POWER_ON:
if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) {
int ret = regulator_enable(mmc->supply.vqmmc);
if (ret < 0)
dev_err(host->dev,
"failed to enable vqmmc regulator\n");
else
host->vqmmc_enabled = true;
}
break;
}
/* Bus width */
switch (ios->bus_width) {
case MMC_BUS_WIDTH_1:
bus_width = CFG_BUS_WIDTH_1;
break;
case MMC_BUS_WIDTH_4:
bus_width = CFG_BUS_WIDTH_4;
break;
case MMC_BUS_WIDTH_8:
bus_width = CFG_BUS_WIDTH_8;
break;
default:
dev_err(host->dev, "Invalid ios->bus_width: %u. Setting to 4.\n",
ios->bus_width);
bus_width = CFG_BUS_WIDTH_4;
}
val = readl(host->regs + SD_EMMC_CFG);
val &= ~CFG_BUS_WIDTH_MASK;
val |= FIELD_PREP(CFG_BUS_WIDTH_MASK, bus_width);
writel(val, host->regs + SD_EMMC_CFG);
meson_mmc_check_resampling(host, ios);
err = meson_mmc_prepare_ios_clock(host, ios);
if (err)
dev_err(host->dev, "Failed to set clock: %d\n,", err);
dev_dbg(host->dev, "SD_EMMC_CFG: 0x%08x\n", val);
}
static void meson_mmc_request_done(struct mmc_host *mmc,
struct mmc_request *mrq)
{
struct meson_host *host = mmc_priv(mmc);
host->cmd = NULL;
mmc_request_done(host->mmc, mrq);
}
static void meson_mmc_set_blksz(struct mmc_host *mmc, unsigned int blksz)
{
struct meson_host *host = mmc_priv(mmc);
u32 cfg, blksz_old;
cfg = readl(host->regs + SD_EMMC_CFG);
blksz_old = FIELD_GET(CFG_BLK_LEN_MASK, cfg);
if (!is_power_of_2(blksz))
dev_err(host->dev, "blksz %u is not a power of 2\n", blksz);
blksz = ilog2(blksz);
/* check if block-size matches, if not update */
if (blksz == blksz_old)
return;
dev_dbg(host->dev, "%s: update blk_len %d -> %d\n", __func__,
blksz_old, blksz);
cfg &= ~CFG_BLK_LEN_MASK;
cfg |= FIELD_PREP(CFG_BLK_LEN_MASK, blksz);
writel(cfg, host->regs + SD_EMMC_CFG);
}
static void meson_mmc_set_response_bits(struct mmc_command *cmd, u32 *cmd_cfg)
{
if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136)
*cmd_cfg |= CMD_CFG_RESP_128;
*cmd_cfg |= CMD_CFG_RESP_NUM;
if (!(cmd->flags & MMC_RSP_CRC))
*cmd_cfg |= CMD_CFG_RESP_NOCRC;
if (cmd->flags & MMC_RSP_BUSY)
*cmd_cfg |= CMD_CFG_R1B;
} else {
*cmd_cfg |= CMD_CFG_NO_RESP;
}
}
static void meson_mmc_desc_chain_transfer(struct mmc_host *mmc, u32 cmd_cfg)
{
struct meson_host *host = mmc_priv(mmc);
struct sd_emmc_desc *desc = host->descs;
struct mmc_data *data = host->cmd->data;
struct scatterlist *sg;
u32 start;
int i;
if (data->flags & MMC_DATA_WRITE)
cmd_cfg |= CMD_CFG_DATA_WR;
if (data->blocks > 1) {
cmd_cfg |= CMD_CFG_BLOCK_MODE;
meson_mmc_set_blksz(mmc, data->blksz);
}
for_each_sg(data->sg, sg, data->sg_count, i) {
unsigned int len = sg_dma_len(sg);
if (data->blocks > 1)
len /= data->blksz;
desc[i].cmd_cfg = cmd_cfg;
desc[i].cmd_cfg |= FIELD_PREP(CMD_CFG_LENGTH_MASK, len);
if (i > 0)
desc[i].cmd_cfg |= CMD_CFG_NO_CMD;
desc[i].cmd_arg = host->cmd->arg;
desc[i].cmd_resp = 0;
desc[i].cmd_data = sg_dma_address(sg);
}
desc[data->sg_count - 1].cmd_cfg |= CMD_CFG_END_OF_CHAIN;
dma_wmb(); /* ensure descriptor is written before kicked */
start = host->descs_dma_addr | START_DESC_BUSY;
writel(start, host->regs + SD_EMMC_START);
}
static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
{
struct meson_host *host = mmc_priv(mmc);
struct mmc_data *data = cmd->data;
u32 cmd_cfg = 0, cmd_data = 0;
unsigned int xfer_bytes = 0;
/* Setup descriptors */
dma_rmb();
host->cmd = cmd;
cmd_cfg |= FIELD_PREP(CMD_CFG_CMD_INDEX_MASK, cmd->opcode);
cmd_cfg |= CMD_CFG_OWNER; /* owned by CPU */
cmd_cfg |= CMD_CFG_ERROR; /* stop in case of error */
meson_mmc_set_response_bits(cmd, &cmd_cfg);
/* data? */
if (data) {
data->bytes_xfered = 0;
cmd_cfg |= CMD_CFG_DATA_IO;
cmd_cfg |= FIELD_PREP(CMD_CFG_TIMEOUT_MASK,
ilog2(meson_mmc_get_timeout_msecs(data)));
if (meson_mmc_desc_chain_mode(data)) {
meson_mmc_desc_chain_transfer(mmc, cmd_cfg);
return;
}
if (data->blocks > 1) {
cmd_cfg |= CMD_CFG_BLOCK_MODE;
cmd_cfg |= FIELD_PREP(CMD_CFG_LENGTH_MASK,
data->blocks);
meson_mmc_set_blksz(mmc, data->blksz);
} else {
cmd_cfg |= FIELD_PREP(CMD_CFG_LENGTH_MASK, data->blksz);
}
xfer_bytes = data->blksz * data->blocks;
if (data->flags & MMC_DATA_WRITE) {
cmd_cfg |= CMD_CFG_DATA_WR;
WARN_ON(xfer_bytes > host->bounce_buf_size);
sg_copy_to_buffer(data->sg, data->sg_len,
host->bounce_buf, xfer_bytes);
dma_wmb();
}
cmd_data = host->bounce_dma_addr & CMD_DATA_MASK;
} else {
cmd_cfg |= FIELD_PREP(CMD_CFG_TIMEOUT_MASK,
ilog2(SD_EMMC_CMD_TIMEOUT));
}
/* Last descriptor */
cmd_cfg |= CMD_CFG_END_OF_CHAIN;
writel(cmd_cfg, host->regs + SD_EMMC_CMD_CFG);
writel(cmd_data, host->regs + SD_EMMC_CMD_DAT);
writel(0, host->regs + SD_EMMC_CMD_RSP);
wmb(); /* ensure descriptor is written before kicked */
writel(cmd->arg, host->regs + SD_EMMC_CMD_ARG);
}
static void meson_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct meson_host *host = mmc_priv(mmc);
bool needs_pre_post_req = mrq->data &&
!(mrq->data->host_cookie & SD_EMMC_PRE_REQ_DONE);
if (needs_pre_post_req) {
meson_mmc_get_transfer_mode(mmc, mrq);
if (!meson_mmc_desc_chain_mode(mrq->data))
needs_pre_post_req = false;
}
if (needs_pre_post_req)
meson_mmc_pre_req(mmc, mrq);
/* Stop execution */
writel(0, host->regs + SD_EMMC_START);
meson_mmc_start_cmd(mmc, mrq->sbc ?: mrq->cmd);
if (needs_pre_post_req)
meson_mmc_post_req(mmc, mrq, 0);
}
static void meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
{
struct meson_host *host = mmc_priv(mmc);
if (cmd->flags & MMC_RSP_136) {
cmd->resp[0] = readl(host->regs + SD_EMMC_CMD_RSP3);
cmd->resp[1] = readl(host->regs + SD_EMMC_CMD_RSP2);
cmd->resp[2] = readl(host->regs + SD_EMMC_CMD_RSP1);
cmd->resp[3] = readl(host->regs + SD_EMMC_CMD_RSP);
} else if (cmd->flags & MMC_RSP_PRESENT) {
cmd->resp[0] = readl(host->regs + SD_EMMC_CMD_RSP);
}
}
static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
{
struct meson_host *host = dev_id;
struct mmc_command *cmd;
struct mmc_data *data;
u32 irq_en, status, raw_status;
irqreturn_t ret = IRQ_NONE;
irq_en = readl(host->regs + SD_EMMC_IRQ_EN);
raw_status = readl(host->regs + SD_EMMC_STATUS);
status = raw_status & irq_en;
if (!status) {
dev_dbg(host->dev,
"Unexpected IRQ! irq_en 0x%08x - status 0x%08x\n",
irq_en, raw_status);
return IRQ_NONE;
}
if (WARN_ON(!host) || WARN_ON(!host->cmd))
return IRQ_NONE;
cmd = host->cmd;
data = cmd->data;
cmd->error = 0;
if (status & IRQ_CRC_ERR) {
dev_dbg(host->dev, "CRC Error - status 0x%08x\n", status);
cmd->error = -EILSEQ;
ret = IRQ_WAKE_THREAD;
goto out;
}
if (status & IRQ_TIMEOUTS) {
dev_dbg(host->dev, "Timeout - status 0x%08x\n", status);
cmd->error = -ETIMEDOUT;
ret = IRQ_WAKE_THREAD;
goto out;
}
meson_mmc_read_resp(host->mmc, cmd);
if (status & IRQ_SDIO) {
dev_dbg(host->dev, "IRQ: SDIO TODO.\n");
ret = IRQ_HANDLED;
}
if (status & (IRQ_END_OF_CHAIN | IRQ_RESP_STATUS)) {
if (data && !cmd->error)
data->bytes_xfered = data->blksz * data->blocks;
if (meson_mmc_bounce_buf_read(data) ||
meson_mmc_get_next_command(cmd))
ret = IRQ_WAKE_THREAD;
else
ret = IRQ_HANDLED;
}
out:
if (cmd->error) {
/* Stop desc in case of errors */
u32 start = readl(host->regs + SD_EMMC_START);
start &= ~START_DESC_BUSY;
writel(start, host->regs + SD_EMMC_START);
}
if (ret == IRQ_HANDLED)
meson_mmc_request_done(host->mmc, cmd->mrq);
/* ack all raised interrupts */
writel(status, host->regs + SD_EMMC_STATUS);
return ret;
}
static int meson_mmc_wait_desc_stop(struct meson_host *host)
{
u32 status;
/*
* It may sometimes take a while for it to actually halt. Here, we
* are giving it 5ms to comply
*
* If we don't confirm the descriptor is stopped, it might raise new
* IRQs after we have called mmc_request_done() which is bad.
*/
return readl_poll_timeout(host->regs + SD_EMMC_STATUS, status,
!(status & (STATUS_BUSY | STATUS_DESC_BUSY)),
100, 5000);
}
static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id)
{
struct meson_host *host = dev_id;
struct mmc_command *next_cmd, *cmd = host->cmd;
struct mmc_data *data;
unsigned int xfer_bytes;
if (WARN_ON(!cmd))
return IRQ_NONE;
if (cmd->error) {
meson_mmc_wait_desc_stop(host);
meson_mmc_request_done(host->mmc, cmd->mrq);
return IRQ_HANDLED;
}
data = cmd->data;
if (meson_mmc_bounce_buf_read(data)) {
xfer_bytes = data->blksz * data->blocks;
WARN_ON(xfer_bytes > host->bounce_buf_size);
sg_copy_from_buffer(data->sg, data->sg_len,
host->bounce_buf, xfer_bytes);
}
next_cmd = meson_mmc_get_next_command(cmd);
if (next_cmd)
meson_mmc_start_cmd(host->mmc, next_cmd);
else
meson_mmc_request_done(host->mmc, cmd->mrq);
return IRQ_HANDLED;
}
/*
* NOTE: we only need this until the GPIO/pinctrl driver can handle
* interrupts. For now, the MMC core will use this for polling.
*/
static int meson_mmc_get_cd(struct mmc_host *mmc)
{
int status = mmc_gpio_get_cd(mmc);
if (status == -ENOSYS)
return 1; /* assume present */
return status;
}
static void meson_mmc_cfg_init(struct meson_host *host)
{
u32 cfg = 0;
cfg |= FIELD_PREP(CFG_RESP_TIMEOUT_MASK,
ilog2(SD_EMMC_CFG_RESP_TIMEOUT));
cfg |= FIELD_PREP(CFG_RC_CC_MASK, ilog2(SD_EMMC_CFG_CMD_GAP));
cfg |= FIELD_PREP(CFG_BLK_LEN_MASK, ilog2(SD_EMMC_CFG_BLK_SIZE));
/* abort chain on R/W errors */
cfg |= CFG_ERR_ABORT;
writel(cfg, host->regs + SD_EMMC_CFG);
}
static int meson_mmc_card_busy(struct mmc_host *mmc)
{
struct meson_host *host = mmc_priv(mmc);
u32 regval;
regval = readl(host->regs + SD_EMMC_STATUS);
/* We are only interrested in lines 0 to 3, so mask the other ones */
return !(FIELD_GET(STATUS_DATI, regval) & 0xf);
}
static int meson_mmc_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)
{
/* vqmmc regulator is available */
if (!IS_ERR(mmc->supply.vqmmc)) {
/*
* The usual amlogic setup uses a GPIO to switch from one
* regulator to the other. While the voltage ramp up is
* pretty fast, care must be taken when switching from 3.3v
* to 1.8v. Please make sure the regulator framework is aware
* of your own regulator constraints
*/
return mmc_regulator_set_vqmmc(mmc, ios);
}
/* no vqmmc regulator, assume fixed regulator at 3/3.3V */
if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
return 0;
return -EINVAL;
}
static const struct mmc_host_ops meson_mmc_ops = {
.request = meson_mmc_request,
.set_ios = meson_mmc_set_ios,
.get_cd = meson_mmc_get_cd,
.pre_req = meson_mmc_pre_req,
.post_req = meson_mmc_post_req,
.execute_tuning = meson_mmc_resampling_tuning,
.card_busy = meson_mmc_card_busy,
.start_signal_voltage_switch = meson_mmc_voltage_switch,
};
static int meson_mmc_probe(struct platform_device *pdev)
{
struct resource *res;
struct meson_host *host;
struct mmc_host *mmc;
int ret;
mmc = mmc_alloc_host(sizeof(struct meson_host), &pdev->dev);
if (!mmc)
return -ENOMEM;
host = mmc_priv(mmc);
host->mmc = mmc;
host->dev = &pdev->dev;
dev_set_drvdata(&pdev->dev, host);
/* Get regulators and the supported OCR mask */
host->vqmmc_enabled = false;
ret = mmc_regulator_get_supply(mmc);
if (ret)
goto free_host;
ret = mmc_of_parse(mmc);
if (ret) {
if (ret != -EPROBE_DEFER)
dev_warn(&pdev->dev, "error parsing DT: %d\n", ret);
goto free_host;
}
host->data = (struct meson_mmc_data *)
of_device_get_match_data(&pdev->dev);
if (!host->data) {
ret = -EINVAL;
goto free_host;
}
ret = device_reset_optional(&pdev->dev);
if (ret) {
if (ret != -EPROBE_DEFER)
dev_err(&pdev->dev, "device reset failed: %d\n", ret);
return ret;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
host->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(host->regs)) {
ret = PTR_ERR(host->regs);
goto free_host;
}
host->irq = platform_get_irq(pdev, 0);
if (host->irq <= 0) {
dev_err(&pdev->dev, "failed to get interrupt resource.\n");
ret = -EINVAL;
goto free_host;
}
host->pinctrl = devm_pinctrl_get(&pdev->dev);
if (IS_ERR(host->pinctrl)) {
ret = PTR_ERR(host->pinctrl);
goto free_host;
}
host->pins_default = pinctrl_lookup_state(host->pinctrl,
PINCTRL_STATE_DEFAULT);
if (IS_ERR(host->pins_default)) {
ret = PTR_ERR(host->pins_default);
goto free_host;
}
host->pins_clk_gate = pinctrl_lookup_state(host->pinctrl,
"clk-gate");
if (IS_ERR(host->pins_clk_gate)) {
dev_warn(&pdev->dev,
"can't get clk-gate pinctrl, using clk_stop bit\n");
host->pins_clk_gate = NULL;
}
host->core_clk = devm_clk_get(&pdev->dev, "core");
if (IS_ERR(host->core_clk)) {
ret = PTR_ERR(host->core_clk);
goto free_host;
}
ret = clk_prepare_enable(host->core_clk);
if (ret)
goto free_host;
ret = meson_mmc_clk_init(host);
if (ret)
goto err_core_clk;
/* set config to sane default */
meson_mmc_cfg_init(host);
/* Stop execution */
writel(0, host->regs + SD_EMMC_START);
/* clear, ack and enable interrupts */
writel(0, host->regs + SD_EMMC_IRQ_EN);
writel(IRQ_CRC_ERR | IRQ_TIMEOUTS | IRQ_END_OF_CHAIN,
host->regs + SD_EMMC_STATUS);
writel(IRQ_CRC_ERR | IRQ_TIMEOUTS | IRQ_END_OF_CHAIN,
host->regs + SD_EMMC_IRQ_EN);
ret = request_threaded_irq(host->irq, meson_mmc_irq,
meson_mmc_irq_thread, IRQF_ONESHOT,
dev_name(&pdev->dev), host);
if (ret)
goto err_init_clk;
mmc->caps |= MMC_CAP_CMD23;
mmc->max_blk_count = CMD_CFG_LENGTH_MASK;
mmc->max_req_size = mmc->max_blk_count * mmc->max_blk_size;
mmc->max_segs = SD_EMMC_DESC_BUF_LEN / sizeof(struct sd_emmc_desc);
mmc->max_seg_size = mmc->max_req_size;
/*
* At the moment, we don't know how to reliably enable HS400.
* From the different datasheets, it is not even clear if this mode
* is officially supported by any of the SoCs
*/
mmc->caps2 &= ~MMC_CAP2_HS400;
/* data bounce buffer */
host->bounce_buf_size = mmc->max_req_size;
host->bounce_buf =
dma_alloc_coherent(host->dev, host->bounce_buf_size,
&host->bounce_dma_addr, GFP_KERNEL);
if (host->bounce_buf == NULL) {
dev_err(host->dev, "Unable to map allocate DMA bounce buffer.\n");
ret = -ENOMEM;
goto err_free_irq;
}
host->descs = dma_alloc_coherent(host->dev, SD_EMMC_DESC_BUF_LEN,
&host->descs_dma_addr, GFP_KERNEL);
if (!host->descs) {
dev_err(host->dev, "Allocating descriptor DMA buffer failed\n");
ret = -ENOMEM;
goto err_bounce_buf;
}
mmc->ops = &meson_mmc_ops;
mmc_add_host(mmc);
return 0;
err_bounce_buf:
dma_free_coherent(host->dev, host->bounce_buf_size,
host->bounce_buf, host->bounce_dma_addr);
err_free_irq:
free_irq(host->irq, host);
err_init_clk:
clk_disable_unprepare(host->mmc_clk);
err_core_clk:
clk_disable_unprepare(host->core_clk);
free_host:
mmc_free_host(mmc);
return ret;
}
static int meson_mmc_remove(struct platform_device *pdev)
{
struct meson_host *host = dev_get_drvdata(&pdev->dev);
mmc_remove_host(host->mmc);
/* disable interrupts */
writel(0, host->regs + SD_EMMC_IRQ_EN);
free_irq(host->irq, host);
dma_free_coherent(host->dev, SD_EMMC_DESC_BUF_LEN,
host->descs, host->descs_dma_addr);
dma_free_coherent(host->dev, host->bounce_buf_size,
host->bounce_buf, host->bounce_dma_addr);
clk_disable_unprepare(host->mmc_clk);
clk_disable_unprepare(host->core_clk);
mmc_free_host(host->mmc);
return 0;
}
static const struct meson_mmc_data meson_gx_data = {
.tx_delay_mask = CLK_V2_TX_DELAY_MASK,
.rx_delay_mask = CLK_V2_RX_DELAY_MASK,
.always_on = CLK_V2_ALWAYS_ON,
.adjust = SD_EMMC_ADJUST,
};
static const struct meson_mmc_data meson_axg_data = {
.tx_delay_mask = CLK_V3_TX_DELAY_MASK,
.rx_delay_mask = CLK_V3_RX_DELAY_MASK,
.always_on = CLK_V3_ALWAYS_ON,
.adjust = SD_EMMC_V3_ADJUST,
};
static const struct of_device_id meson_mmc_of_match[] = {
{ .compatible = "amlogic,meson-gx-mmc", .data = &meson_gx_data },
{ .compatible = "amlogic,meson-gxbb-mmc", .data = &meson_gx_data },
{ .compatible = "amlogic,meson-gxl-mmc", .data = &meson_gx_data },
{ .compatible = "amlogic,meson-gxm-mmc", .data = &meson_gx_data },
{ .compatible = "amlogic,meson-axg-mmc", .data = &meson_axg_data },
{}
};
MODULE_DEVICE_TABLE(of, meson_mmc_of_match);
static struct platform_driver meson_mmc_driver = {
.probe = meson_mmc_probe,
.remove = meson_mmc_remove,
.driver = {
.name = DRIVER_NAME,
.of_match_table = of_match_ptr(meson_mmc_of_match),
},
};
module_platform_driver(meson_mmc_driver);
MODULE_DESCRIPTION("Amlogic S905*/GX*/AXG SD/eMMC driver");
MODULE_AUTHOR("Kevin Hilman <khilman@baylibre.com>");
MODULE_LICENSE("GPL v2");
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