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linux/drivers/mmc/host/meson-gx-mmc.c
Jerome Brunet fe0e58048f Revert "mmc: meson-gx: include tx phase in the tuning process" 
This reverts commit 0a44697627.

This commit was initially intended to fix problems with hs200 and hs400
on some boards, mainly the odroid-c2. The OC2 (Rev 0.2) I have performs
well in this modes, so I could not confirm these issues.

We've had several reports about the issues being still present on (some)
OC2, so apparently, this change does not do what it was supposed to do.
Maybe the eMMC signal quality is on the edge on the board. This may
explain the variability we see in term of stability, but this is just a
guess. Lowering the max_frequency to 100Mhz seems to do trick for those
affected by the issue

Worse, the commit created new issues (CRC errors and hangs) on other
boards, such as the kvim 1 and 2, the p200 or the libretech-cc.

According to amlogic, the Tx phase should not be tuned and left in its
default configuration, so it is best to just revert the commit.

Fixes: 0a44697627 ("mmc: meson-gx: include tx phase in the tuning process")
Cc: <stable@vger.kernel.org> # 4.14+
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2018-02-14 11:30:03 +01:00

1341 lines
35 KiB
C
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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/device.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/ioport.h>
#include <linux/spinlock.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/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_TX_DELAY_MASK GENMASK(19, 16)
#define CLK_RX_DELAY_MASK GENMASK(23, 20)
#define CLK_DELAY_STEP_PS 200
#define CLK_PHASE_STEP 30
#define CLK_PHASE_POINT_NUM (360 / CLK_PHASE_STEP)
#define CLK_ALWAYS_ON BIT(24)
#define SD_EMMC_DELAY 0x4
#define SD_EMMC_ADJUST 0x8
#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 SD_EMMC_STATUS 0x48
#define STATUS_BUSY BIT(31)
#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 sd_emmc_desc {
u32 cmd_cfg;
u32 cmd_arg;
u32 cmd_data;
u32 cmd_resp;
};
struct meson_host {
struct device *dev;
struct mmc_host *mmc;
struct mmc_command *cmd;
spinlock_t lock;
void __iomem *regs;
struct clk *core_clk;
struct clk *mmc_clk;
struct clk *rx_clk;
struct clk *tx_clk;
unsigned long req_rate;
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;
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)
struct meson_mmc_phase {
struct clk_hw hw;
void __iomem *reg;
unsigned long phase_mask;
unsigned long delay_mask;
unsigned int delay_step_ps;
};
#define to_meson_mmc_phase(_hw) container_of(_hw, struct meson_mmc_phase, hw)
static int meson_mmc_clk_get_phase(struct clk_hw *hw)
{
struct meson_mmc_phase *mmc = to_meson_mmc_phase(hw);
unsigned int phase_num = 1 << hweight_long(mmc->phase_mask);
unsigned long period_ps, p, d;
int degrees;
u32 val;
val = readl(mmc->reg);
p = (val & mmc->phase_mask) >> __ffs(mmc->phase_mask);
degrees = p * 360 / phase_num;
if (mmc->delay_mask) {
period_ps = DIV_ROUND_UP((unsigned long)NSEC_PER_SEC * 1000,
clk_get_rate(hw->clk));
d = (val & mmc->delay_mask) >> __ffs(mmc->delay_mask);
degrees += d * mmc->delay_step_ps * 360 / period_ps;
degrees %= 360;
}
return degrees;
}
static void meson_mmc_apply_phase_delay(struct meson_mmc_phase *mmc,
unsigned int phase,
unsigned int delay)
{
u32 val;
val = readl(mmc->reg);
val &= ~mmc->phase_mask;
val |= phase << __ffs(mmc->phase_mask);
if (mmc->delay_mask) {
val &= ~mmc->delay_mask;
val |= delay << __ffs(mmc->delay_mask);
}
writel(val, mmc->reg);
}
static int meson_mmc_clk_set_phase(struct clk_hw *hw, int degrees)
{
struct meson_mmc_phase *mmc = to_meson_mmc_phase(hw);
unsigned int phase_num = 1 << hweight_long(mmc->phase_mask);
unsigned long period_ps, d = 0, r;
uint64_t p;
p = degrees % 360;
if (!mmc->delay_mask) {
p = DIV_ROUND_CLOSEST_ULL(p, 360 / phase_num);
} else {
period_ps = DIV_ROUND_UP((unsigned long)NSEC_PER_SEC * 1000,
clk_get_rate(hw->clk));
/* First compute the phase index (p), the remainder (r) is the
* part we'll try to acheive using the delays (d).
*/
r = do_div(p, 360 / phase_num);
d = DIV_ROUND_CLOSEST(r * period_ps,
360 * mmc->delay_step_ps);
d = min(d, mmc->delay_mask >> __ffs(mmc->delay_mask));
}
meson_mmc_apply_phase_delay(mmc, p, d);
return 0;
}
static const struct clk_ops meson_mmc_clk_phase_ops = {
.get_phase = meson_mmc_clk_get_phase,
.set_phase = meson_mmc_clk_set_phase,
};
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));
}
static bool meson_mmc_timing_is_ddr(struct mmc_ios *ios)
{
if (ios->timing == MMC_TIMING_MMC_DDR52 ||
ios->timing == MMC_TIMING_UHS_DDR50 ||
ios->timing == MMC_TIMING_MMC_HS400)
return true;
return false;
}
/*
* 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, struct mmc_ios *ios)
{
struct mmc_host *mmc = host->mmc;
unsigned long rate = ios->clock;
int ret;
u32 cfg;
/* DDR modes require higher module clock */
if (meson_mmc_timing_is_ddr(ios))
rate <<= 1;
/* Same request - bail-out */
if (host->req_rate == rate)
return 0;
/* stop clock */
meson_mmc_clk_gate(host);
host->req_rate = 0;
if (!rate) {
mmc->actual_clock = 0;
/* return with clock being stopped */
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);
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 (meson_mmc_timing_is_ddr(ios))
mmc->actual_clock >>= 1;
dev_dbg(host->dev, "clk rate: %u Hz\n", mmc->actual_clock);
if (ios->clock != mmc->actual_clock)
dev_dbg(host->dev, "requested rate was %u\n", ios->clock);
/* (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;
struct meson_mmc_phase *core, *tx, *rx;
struct clk *clk;
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 = 0;
clk_reg |= CLK_ALWAYS_ON;
clk_reg |= CLK_DIV_MASK;
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;
clk = devm_clk_register(host->dev, &mux->hw);
if (WARN_ON(IS_ERR(clk)))
return PTR_ERR(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(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;
clk = devm_clk_register(host->dev, &div->hw);
if (WARN_ON(IS_ERR(clk)))
return PTR_ERR(clk);
/* create the mmc core clock */
core = devm_kzalloc(host->dev, sizeof(*core), GFP_KERNEL);
if (!core)
return -ENOMEM;
snprintf(clk_name, sizeof(clk_name), "%s#core", dev_name(host->dev));
init.name = clk_name;
init.ops = &meson_mmc_clk_phase_ops;
init.flags = CLK_SET_RATE_PARENT;
clk_parent[0] = __clk_get_name(clk);
init.parent_names = clk_parent;
init.num_parents = 1;
core->reg = host->regs + SD_EMMC_CLOCK;
core->phase_mask = CLK_CORE_PHASE_MASK;
core->hw.init = &init;
host->mmc_clk = devm_clk_register(host->dev, &core->hw);
if (WARN_ON(PTR_ERR_OR_ZERO(host->mmc_clk)))
return PTR_ERR(host->mmc_clk);
/* create the mmc tx clock */
tx = devm_kzalloc(host->dev, sizeof(*tx), GFP_KERNEL);
if (!tx)
return -ENOMEM;
snprintf(clk_name, sizeof(clk_name), "%s#tx", dev_name(host->dev));
init.name = clk_name;
init.ops = &meson_mmc_clk_phase_ops;
init.flags = 0;
clk_parent[0] = __clk_get_name(host->mmc_clk);
init.parent_names = clk_parent;
init.num_parents = 1;
tx->reg = host->regs + SD_EMMC_CLOCK;
tx->phase_mask = CLK_TX_PHASE_MASK;
tx->delay_mask = CLK_TX_DELAY_MASK;
tx->delay_step_ps = CLK_DELAY_STEP_PS;
tx->hw.init = &init;
host->tx_clk = devm_clk_register(host->dev, &tx->hw);
if (WARN_ON(PTR_ERR_OR_ZERO(host->tx_clk)))
return PTR_ERR(host->tx_clk);
/* create the mmc rx clock */
rx = devm_kzalloc(host->dev, sizeof(*rx), GFP_KERNEL);
if (!rx)
return -ENOMEM;
snprintf(clk_name, sizeof(clk_name), "%s#rx", dev_name(host->dev));
init.name = clk_name;
init.ops = &meson_mmc_clk_phase_ops;
init.flags = 0;
clk_parent[0] = __clk_get_name(host->mmc_clk);
init.parent_names = clk_parent;
init.num_parents = 1;
rx->reg = host->regs + SD_EMMC_CLOCK;
rx->phase_mask = CLK_RX_PHASE_MASK;
rx->delay_mask = CLK_RX_DELAY_MASK;
rx->delay_step_ps = CLK_DELAY_STEP_PS;
rx->hw.init = &init;
host->rx_clk = devm_clk_register(host->dev, &rx->hw);
if (WARN_ON(PTR_ERR_OR_ZERO(host->rx_clk)))
return PTR_ERR(host->rx_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;
/*
* Set phases : These values are mostly the datasheet recommended ones
* except for the Tx phase. Datasheet recommends 180 but some cards
* fail at initialisation with it. 270 works just fine, it fixes these
* initialisation issues and enable eMMC DDR52 mode.
*/
clk_set_phase(host->mmc_clk, 180);
clk_set_phase(host->tx_clk, 270);
clk_set_phase(host->rx_clk, 0);
return clk_prepare_enable(host->mmc_clk);
}
static void meson_mmc_shift_map(unsigned long *map, unsigned long shift)
{
DECLARE_BITMAP(left, CLK_PHASE_POINT_NUM);
DECLARE_BITMAP(right, CLK_PHASE_POINT_NUM);
/*
* shift the bitmap right and reintroduce the dropped bits on the left
* of the bitmap
*/
bitmap_shift_right(right, map, shift, CLK_PHASE_POINT_NUM);
bitmap_shift_left(left, map, CLK_PHASE_POINT_NUM - shift,
CLK_PHASE_POINT_NUM);
bitmap_or(map, left, right, CLK_PHASE_POINT_NUM);
}
static void meson_mmc_find_next_region(unsigned long *map,
unsigned long *start,
unsigned long *stop)
{
*start = find_next_bit(map, CLK_PHASE_POINT_NUM, *start);
*stop = find_next_zero_bit(map, CLK_PHASE_POINT_NUM, *start);
}
static int meson_mmc_find_tuning_point(unsigned long *test)
{
unsigned long shift, stop, offset = 0, start = 0, size = 0;
/* Get the all good/all bad situation out the way */
if (bitmap_full(test, CLK_PHASE_POINT_NUM))
return 0; /* All points are good so point 0 will do */
else if (bitmap_empty(test, CLK_PHASE_POINT_NUM))
return -EIO; /* No successful tuning point */
/*
* Now we know there is a least one region find. Make sure it does
* not wrap by the shifting the bitmap if necessary
*/
shift = find_first_zero_bit(test, CLK_PHASE_POINT_NUM);
if (shift != 0)
meson_mmc_shift_map(test, shift);
while (start < CLK_PHASE_POINT_NUM) {
meson_mmc_find_next_region(test, &start, &stop);
if ((stop - start) > size) {
offset = start;
size = stop - start;
}
start = stop;
}
/* Get the center point of the region */
offset += (size / 2);
/* Shift the result back */
offset = (offset + shift) % CLK_PHASE_POINT_NUM;
return offset;
}
static int meson_mmc_clk_phase_tuning(struct mmc_host *mmc, u32 opcode,
struct clk *clk)
{
int point, ret;
DECLARE_BITMAP(test, CLK_PHASE_POINT_NUM);
dev_dbg(mmc_dev(mmc), "%s phase/delay tunning...\n",
__clk_get_name(clk));
bitmap_zero(test, CLK_PHASE_POINT_NUM);
/* Explore tuning points */
for (point = 0; point < CLK_PHASE_POINT_NUM; point++) {
clk_set_phase(clk, point * CLK_PHASE_STEP);
ret = mmc_send_tuning(mmc, opcode, NULL);
if (!ret)
set_bit(point, test);
}
/* Find the optimal tuning point and apply it */
point = meson_mmc_find_tuning_point(test);
if (point < 0)
return point; /* tuning failed */
clk_set_phase(clk, point * CLK_PHASE_STEP);
dev_dbg(mmc_dev(mmc), "success with phase: %d\n",
clk_get_phase(clk));
return 0;
}
static int meson_mmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
struct meson_host *host = mmc_priv(mmc);
return meson_mmc_clk_phase_tuning(mmc, opcode, host->rx_clk);
}
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);
/* Reset rx phase */
clk_set_phase(host->rx_clk, 0);
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);
val &= ~CFG_DDR;
if (meson_mmc_timing_is_ddr(ios))
val |= CFG_DDR;
val &= ~CFG_CHK_DS;
if (ios->timing == MMC_TIMING_MMC_HS400)
val |= CFG_CHK_DS;
err = meson_mmc_clk_set(host, ios);
if (err)
dev_err(host->dev, "Failed to set clock: %d\n,", err);
writel(val, host->regs + SD_EMMC_CFG);
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 */
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;
if (WARN_ON(!host) || WARN_ON(!host->cmd))
return IRQ_NONE;
spin_lock(&host->lock);
cmd = host->cmd;
data = cmd->data;
irq_en = readl(host->regs + SD_EMMC_IRQ_EN);
raw_status = readl(host->regs + SD_EMMC_STATUS);
status = raw_status & irq_en;
cmd->error = 0;
if (status & IRQ_CRC_ERR) {
dev_dbg(host->dev, "CRC Error - status 0x%08x\n", status);
cmd->error = -EILSEQ;
ret = IRQ_HANDLED;
goto out;
}
if (status & IRQ_TIMEOUTS) {
dev_dbg(host->dev, "Timeout - status 0x%08x\n", status);
cmd->error = -ETIMEDOUT;
ret = IRQ_HANDLED;
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:
/* ack all enabled interrupts */
writel(irq_en, host->regs + SD_EMMC_STATUS);
if (ret == IRQ_HANDLED)
meson_mmc_request_done(host->mmc, cmd->mrq);
else if (ret == IRQ_NONE)
dev_warn(host->dev,
"Unexpected IRQ! status=0x%08x, irq_en=0x%08x\n",
raw_status, irq_en);
spin_unlock(&host->lock);
return ret;
}
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;
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));
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_execute_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, irq;
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);
spin_lock_init(&host->lock);
/* 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;
}
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;
}
irq = platform_get_irq(pdev, 0);
if (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 = devm_request_threaded_irq(&pdev->dev, irq, meson_mmc_irq,
meson_mmc_irq_thread, IRQF_SHARED,
NULL, 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;
/* 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_init_clk;
}
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_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);
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 of_device_id meson_mmc_of_match[] = {
{ .compatible = "amlogic,meson-gx-mmc", },
{ .compatible = "amlogic,meson-gxbb-mmc", },
{ .compatible = "amlogic,meson-gxl-mmc", },
{ .compatible = "amlogic,meson-gxm-mmc", },
{}
};
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* SD/eMMC driver");
MODULE_AUTHOR("Kevin Hilman <khilman@baylibre.com>");
MODULE_LICENSE("GPL v2");
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