obj-$(CONFIG_MMC_USHC) += ushc.o
obj-$(CONFIG_MMC_WMT) += wmt-sdmmc.o
obj-$(CONFIG_MMC_MESON_GX) += meson-gx-mmc.o
-obj-$(CONFIG_MMC_MESON_MX_SDHC) += meson-mx-sdhc-clkc.o meson-mx-sdhc.o
+meson-mx-sdhc-objs := meson-mx-sdhc-clkc.o meson-mx-sdhc-mmc.o
+obj-$(CONFIG_MMC_MESON_MX_SDHC) += meson-mx-sdhc.o
obj-$(CONFIG_MMC_MESON_MX_SDIO) += meson-mx-sdio.o
obj-$(CONFIG_MMC_MOXART) += moxart-mmc.o
obj-$(CONFIG_MMC_SUNXI) += sunxi-mmc.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Amlogic Meson6/Meson8/Meson8b/Meson8m2 SDHC MMC host controller driver.
+ *
+ * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/types.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/slot-gpio.h>
+
+#include "meson-mx-sdhc.h"
+
+#define MESON_SDHC_NUM_BULK_CLKS 4
+#define MESON_SDHC_MAX_BLK_SIZE 512
+#define MESON_SDHC_NUM_TUNING_TRIES 10
+
+#define MESON_SDHC_WAIT_CMD_READY_SLEEP_US 1
+#define MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US 100000
+#define MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US 1
+#define MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US 200
+
+struct meson_mx_sdhc_data {
+ void (*init_hw)(struct mmc_host *mmc);
+ void (*set_pdma)(struct mmc_host *mmc);
+ void (*wait_before_send)(struct mmc_host *mmc);
+ bool hardware_flush_all_cmds;
+};
+
+struct meson_mx_sdhc_host {
+ struct mmc_host *mmc;
+
+ struct mmc_request *mrq;
+ struct mmc_command *cmd;
+ int error;
+
+ struct regmap *regmap;
+
+ struct clk *pclk;
+ struct clk *sd_clk;
+ struct clk_bulk_data bulk_clks[MESON_SDHC_NUM_BULK_CLKS];
+ bool bulk_clks_enabled;
+
+ const struct meson_mx_sdhc_data *platform;
+};
+
+static const struct regmap_config meson_mx_sdhc_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = MESON_SDHC_CLK2,
+};
+
+static void meson_mx_sdhc_hw_reset(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+ regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_MAIN_CTRL |
+ MESON_SDHC_SRST_RXFIFO | MESON_SDHC_SRST_TXFIFO |
+ MESON_SDHC_SRST_DPHY_RX | MESON_SDHC_SRST_DPHY_TX |
+ MESON_SDHC_SRST_DMA_IF);
+ usleep_range(10, 100);
+
+ regmap_write(host->regmap, MESON_SDHC_SRST, 0);
+ usleep_range(10, 100);
+}
+
+static void meson_mx_sdhc_clear_fifo(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ u32 stat;
+
+ regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
+ if (!FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) &&
+ !FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat))
+ return;
+
+ regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_RXFIFO |
+ MESON_SDHC_SRST_TXFIFO | MESON_SDHC_SRST_MAIN_CTRL);
+ udelay(5);
+
+ regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
+ if (FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) ||
+ FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat))
+ dev_warn(mmc_dev(host->mmc),
+ "Failed to clear FIFOs, RX: %lu, TX: %lu\n",
+ FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat),
+ FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat));
+}
+
+static void meson_mx_sdhc_wait_cmd_ready(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ u32 stat, esta;
+ int ret;
+
+ ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT, stat,
+ !(stat & MESON_SDHC_STAT_CMD_BUSY),
+ MESON_SDHC_WAIT_CMD_READY_SLEEP_US,
+ MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US);
+ if (ret) {
+ dev_warn(mmc_dev(mmc),
+ "Failed to poll for CMD_BUSY while processing CMD%d\n",
+ host->cmd->opcode);
+ meson_mx_sdhc_hw_reset(mmc);
+ }
+
+ ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, esta,
+ !(esta & MESON_SDHC_ESTA_11_13),
+ MESON_SDHC_WAIT_CMD_READY_SLEEP_US,
+ MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US);
+ if (ret) {
+ dev_warn(mmc_dev(mmc),
+ "Failed to poll for ESTA[13:11] while processing CMD%d\n",
+ host->cmd->opcode);
+ meson_mx_sdhc_hw_reset(mmc);
+ }
+}
+
+static void meson_mx_sdhc_start_cmd(struct mmc_host *mmc,
+ struct mmc_command *cmd)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ u32 ictl, send;
+ int pack_len;
+
+ host->cmd = cmd;
+
+ ictl = MESON_SDHC_ICTL_DATA_TIMEOUT | MESON_SDHC_ICTL_DATA_ERR_CRC |
+ MESON_SDHC_ICTL_RXFIFO_FULL | MESON_SDHC_ICTL_TXFIFO_EMPTY |
+ MESON_SDHC_ICTL_RESP_TIMEOUT | MESON_SDHC_ICTL_RESP_ERR_CRC;
+
+ send = FIELD_PREP(MESON_SDHC_SEND_CMD_INDEX, cmd->opcode);
+
+ if (cmd->data) {
+ send |= MESON_SDHC_SEND_CMD_HAS_DATA;
+ send |= FIELD_PREP(MESON_SDHC_SEND_TOTAL_PACK,
+ cmd->data->blocks - 1);
+
+ if (cmd->data->blksz < MESON_SDHC_MAX_BLK_SIZE)
+ pack_len = cmd->data->blksz;
+ else
+ pack_len = 0;
+
+ if (cmd->data->flags & MMC_DATA_WRITE)
+ send |= MESON_SDHC_SEND_DATA_DIR;
+
+ /*
+ * If command with no data, just wait response done
+ * interrupt(int[0]), and if command with data transfer, just
+ * wait dma done interrupt(int[11]), don't need care about
+ * dat0 busy or not.
+ */
+ if (host->platform->hardware_flush_all_cmds ||
+ cmd->data->flags & MMC_DATA_WRITE)
+ /* hardware flush: */
+ ictl |= MESON_SDHC_ICTL_DMA_DONE;
+ else
+ /* software flush: */
+ ictl |= MESON_SDHC_ICTL_DATA_XFER_OK;
+ } else {
+ pack_len = 0;
+
+ ictl |= MESON_SDHC_ICTL_RESP_OK;
+ }
+
+ if (cmd->opcode == MMC_STOP_TRANSMISSION)
+ send |= MESON_SDHC_SEND_DATA_STOP;
+
+ if (cmd->flags & MMC_RSP_PRESENT)
+ send |= MESON_SDHC_SEND_CMD_HAS_RESP;
+
+ if (cmd->flags & MMC_RSP_136) {
+ send |= MESON_SDHC_SEND_RESP_LEN;
+ send |= MESON_SDHC_SEND_RESP_NO_CRC;
+ }
+
+ if (!(cmd->flags & MMC_RSP_CRC))
+ send |= MESON_SDHC_SEND_RESP_NO_CRC;
+
+ if (cmd->flags & MMC_RSP_BUSY)
+ send |= MESON_SDHC_SEND_R1B;
+
+ /* enable the new IRQs and mask all pending ones */
+ regmap_write(host->regmap, MESON_SDHC_ICTL, ictl);
+ regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS);
+
+ regmap_write(host->regmap, MESON_SDHC_ARGU, cmd->arg);
+
+ regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
+ MESON_SDHC_CTRL_PACK_LEN,
+ FIELD_PREP(MESON_SDHC_CTRL_PACK_LEN, pack_len));
+
+ if (cmd->data)
+ regmap_write(host->regmap, MESON_SDHC_ADDR,
+ sg_dma_address(cmd->data->sg));
+
+ meson_mx_sdhc_wait_cmd_ready(mmc);
+
+ if (cmd->data)
+ host->platform->set_pdma(mmc);
+
+ if (host->platform->wait_before_send)
+ host->platform->wait_before_send(mmc);
+
+ regmap_write(host->regmap, MESON_SDHC_SEND, send);
+}
+
+static void meson_mx_sdhc_disable_clks(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+ if (!host->bulk_clks_enabled)
+ return;
+
+ clk_bulk_disable_unprepare(MESON_SDHC_NUM_BULK_CLKS, host->bulk_clks);
+
+ host->bulk_clks_enabled = false;
+}
+
+static int meson_mx_sdhc_enable_clks(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ int ret;
+
+ if (host->bulk_clks_enabled)
+ return 0;
+
+ ret = clk_bulk_prepare_enable(MESON_SDHC_NUM_BULK_CLKS,
+ host->bulk_clks);
+ if (ret)
+ return ret;
+
+ host->bulk_clks_enabled = true;
+
+ return 0;
+}
+
+static int meson_mx_sdhc_set_clk(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ u32 rx_clk_phase;
+ int ret;
+
+ meson_mx_sdhc_disable_clks(mmc);
+
+ if (ios->clock) {
+ ret = clk_set_rate(host->sd_clk, ios->clock);
+ if (ret) {
+ dev_warn(mmc_dev(mmc),
+ "Failed to set MMC clock to %uHz: %d\n",
+ ios->clock, host->error);
+ return ret;
+ }
+
+ ret = meson_mx_sdhc_enable_clks(mmc);
+ if (ret)
+ return ret;
+
+ mmc->actual_clock = clk_get_rate(host->sd_clk);
+
+ /*
+ * according to Amlogic the following latching points are
+ * selected with empirical values, there is no (known) formula
+ * to calculate these.
+ */
+ if (mmc->actual_clock > 100000000) {
+ rx_clk_phase = 1;
+ } else if (mmc->actual_clock > 45000000) {
+ if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
+ rx_clk_phase = 15;
+ else
+ rx_clk_phase = 11;
+ } else if (mmc->actual_clock >= 25000000) {
+ rx_clk_phase = 15;
+ } else if (mmc->actual_clock > 5000000) {
+ rx_clk_phase = 23;
+ } else if (mmc->actual_clock > 1000000) {
+ rx_clk_phase = 55;
+ } else {
+ rx_clk_phase = 1061;
+ }
+
+ regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
+ MESON_SDHC_CLK2_RX_CLK_PHASE,
+ FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
+ rx_clk_phase));
+ } else {
+ mmc->actual_clock = 0;
+ }
+
+ return 0;
+}
+
+static void meson_mx_sdhc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ unsigned short vdd = ios->vdd;
+
+ switch (ios->power_mode) {
+ case MMC_POWER_OFF:
+ vdd = 0;
+ fallthrough;
+
+ case MMC_POWER_UP:
+ if (!IS_ERR(mmc->supply.vmmc)) {
+ host->error = mmc_regulator_set_ocr(mmc,
+ mmc->supply.vmmc,
+ vdd);
+ if (host->error)
+ return;
+ }
+
+ break;
+
+ case MMC_POWER_ON:
+ break;
+ }
+
+ host->error = meson_mx_sdhc_set_clk(mmc, ios);
+ if (host->error)
+ return;
+
+ switch (ios->bus_width) {
+ case MMC_BUS_WIDTH_1:
+ regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
+ MESON_SDHC_CTRL_DAT_TYPE,
+ FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 0));
+ break;
+
+ case MMC_BUS_WIDTH_4:
+ regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
+ MESON_SDHC_CTRL_DAT_TYPE,
+ FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 1));
+ break;
+
+ case MMC_BUS_WIDTH_8:
+ regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
+ MESON_SDHC_CTRL_DAT_TYPE,
+ FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 2));
+ break;
+
+ default:
+ dev_err(mmc_dev(mmc), "unsupported bus width: %d\n",
+ ios->bus_width);
+ host->error = -EINVAL;
+ return;
+ }
+}
+
+static int meson_mx_sdhc_map_dma(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct mmc_data *data = mrq->data;
+ int dma_len;
+
+ if (!data)
+ return 0;
+
+ dma_len = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len,
+ mmc_get_dma_dir(data));
+ if (dma_len <= 0) {
+ dev_err(mmc_dev(mmc), "dma_map_sg failed\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void meson_mx_sdhc_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ struct mmc_command *cmd = mrq->cmd;
+
+ if (!host->error)
+ host->error = meson_mx_sdhc_map_dma(mmc, mrq);
+
+ if (host->error) {
+ cmd->error = host->error;
+ mmc_request_done(mmc, mrq);
+ return;
+ }
+
+ host->mrq = mrq;
+
+ meson_mx_sdhc_start_cmd(mmc, mrq->cmd);
+}
+
+static int meson_mx_sdhc_card_busy(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ u32 stat;
+
+ regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
+ return FIELD_GET(MESON_SDHC_STAT_DAT3_0, stat) == 0;
+}
+
+static bool meson_mx_sdhc_tuning_point_matches(struct mmc_host *mmc,
+ u32 opcode)
+{
+ unsigned int i, num_matches = 0;
+ int ret;
+
+ for (i = 0; i < MESON_SDHC_NUM_TUNING_TRIES; i++) {
+ ret = mmc_send_tuning(mmc, opcode, NULL);
+ if (!ret)
+ num_matches++;
+ }
+
+ return num_matches == MESON_SDHC_NUM_TUNING_TRIES;
+}
+
+static int meson_mx_sdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ int div, start, len, best_start, best_len;
+ int curr_phase, old_phase, new_phase;
+ u32 val;
+
+ len = 0;
+ start = 0;
+ best_len = 0;
+
+ regmap_read(host->regmap, MESON_SDHC_CLK2, &val);
+ old_phase = FIELD_GET(MESON_SDHC_CLK2_RX_CLK_PHASE, val);
+
+ regmap_read(host->regmap, MESON_SDHC_CLKC, &val);
+ div = FIELD_GET(MESON_SDHC_CLKC_CLK_DIV, val);
+
+ for (curr_phase = 0; curr_phase <= div; curr_phase++) {
+ regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
+ MESON_SDHC_CLK2_RX_CLK_PHASE,
+ FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
+ curr_phase));
+
+ if (meson_mx_sdhc_tuning_point_matches(mmc, opcode)) {
+ if (!len) {
+ start = curr_phase;
+
+ dev_dbg(mmc_dev(mmc),
+ "New RX phase window starts at %u\n",
+ start);
+ }
+
+ len++;
+ } else {
+ if (len > best_len) {
+ best_start = start;
+ best_len = len;
+
+ dev_dbg(mmc_dev(mmc),
+ "New best RX phase window: %u - %u\n",
+ best_start, best_start + best_len);
+ }
+
+ /* reset the current window */
+ len = 0;
+ }
+ }
+
+ if (len > best_len)
+ /* the last window is the best (or possibly only) window */
+ new_phase = start + (len / 2);
+ else if (best_len)
+ /* there was a better window than the last */
+ new_phase = best_start + (best_len / 2);
+ else
+ /* no window was found at all, reset to the original phase */
+ new_phase = old_phase;
+
+ regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
+ MESON_SDHC_CLK2_RX_CLK_PHASE,
+ FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
+ new_phase));
+
+ if (!len && !best_len)
+ return -EIO;
+
+ dev_dbg(mmc_dev(mmc), "Tuned RX clock phase to %u\n", new_phase);
+
+ return 0;
+}
+
+static const struct mmc_host_ops meson_mx_sdhc_ops = {
+ .hw_reset = meson_mx_sdhc_hw_reset,
+ .request = meson_mx_sdhc_request,
+ .set_ios = meson_mx_sdhc_set_ios,
+ .card_busy = meson_mx_sdhc_card_busy,
+ .execute_tuning = meson_mx_sdhc_execute_tuning,
+ .get_cd = mmc_gpio_get_cd,
+ .get_ro = mmc_gpio_get_ro,
+};
+
+static void meson_mx_sdhc_request_done(struct meson_mx_sdhc_host *host)
+{
+ struct mmc_request *mrq = host->mrq;
+ struct mmc_host *mmc = host->mmc;
+
+ /* disable interrupts and mask all pending ones */
+ regmap_update_bits(host->regmap, MESON_SDHC_ICTL,
+ MESON_SDHC_ICTL_ALL_IRQS, 0);
+ regmap_update_bits(host->regmap, MESON_SDHC_ISTA,
+ MESON_SDHC_ISTA_ALL_IRQS, MESON_SDHC_ISTA_ALL_IRQS);
+
+ host->mrq = NULL;
+ host->cmd = NULL;
+
+ mmc_request_done(mmc, mrq);
+}
+
+static u32 meson_mx_sdhc_read_response(struct meson_mx_sdhc_host *host, u8 idx)
+{
+ u32 val;
+
+ regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_DMA_MODE, 0);
+
+ regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_PIO_RDRESP,
+ FIELD_PREP(MESON_SDHC_PDMA_PIO_RDRESP, idx));
+
+ regmap_read(host->regmap, MESON_SDHC_ARGU, &val);
+
+ return val;
+}
+
+static irqreturn_t meson_mx_sdhc_irq(int irq, void *data)
+{
+ struct meson_mx_sdhc_host *host = data;
+ struct mmc_command *cmd = host->cmd;
+ u32 ictl, ista;
+
+ regmap_read(host->regmap, MESON_SDHC_ICTL, &ictl);
+ regmap_read(host->regmap, MESON_SDHC_ISTA, &ista);
+
+ if (!(ictl & ista))
+ return IRQ_NONE;
+
+ if (ista & MESON_SDHC_ISTA_RXFIFO_FULL ||
+ ista & MESON_SDHC_ISTA_TXFIFO_EMPTY)
+ cmd->error = -EIO;
+ else if (ista & MESON_SDHC_ISTA_RESP_ERR_CRC)
+ cmd->error = -EILSEQ;
+ else if (ista & MESON_SDHC_ISTA_RESP_TIMEOUT)
+ cmd->error = -ETIMEDOUT;
+
+ if (cmd->data) {
+ if (ista & MESON_SDHC_ISTA_DATA_ERR_CRC)
+ cmd->data->error = -EILSEQ;
+ else if (ista & MESON_SDHC_ISTA_DATA_TIMEOUT)
+ cmd->data->error = -ETIMEDOUT;
+ }
+
+ if (cmd->error || (cmd->data && cmd->data->error))
+ dev_dbg(mmc_dev(host->mmc), "CMD%d error, ISTA: 0x%08x\n",
+ cmd->opcode, ista);
+
+ return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t meson_mx_sdhc_irq_thread(int irq, void *irq_data)
+{
+ struct meson_mx_sdhc_host *host = irq_data;
+ struct mmc_command *cmd;
+ u32 val;
+
+ cmd = host->cmd;
+ if (WARN_ON(!cmd))
+ return IRQ_HANDLED;
+
+ if (cmd->data && !cmd->data->error) {
+ if (!host->platform->hardware_flush_all_cmds &&
+ cmd->data->flags & MMC_DATA_READ) {
+ meson_mx_sdhc_wait_cmd_ready(host->mmc);
+
+ val = FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
+ 2);
+ regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
+ val);
+ }
+
+ dma_unmap_sg(mmc_dev(host->mmc), cmd->data->sg,
+ cmd->data->sg_len, mmc_get_dma_dir(cmd->data));
+
+ cmd->data->bytes_xfered = cmd->data->blksz * cmd->data->blocks;
+ }
+
+ meson_mx_sdhc_wait_cmd_ready(host->mmc);
+
+ if (cmd->flags & MMC_RSP_136) {
+ cmd->resp[0] = meson_mx_sdhc_read_response(host, 4);
+ cmd->resp[1] = meson_mx_sdhc_read_response(host, 3);
+ cmd->resp[2] = meson_mx_sdhc_read_response(host, 2);
+ cmd->resp[3] = meson_mx_sdhc_read_response(host, 1);
+ } else {
+ cmd->resp[0] = meson_mx_sdhc_read_response(host, 0);
+ }
+
+ if (cmd->error == -EIO || cmd->error == -ETIMEDOUT)
+ meson_mx_sdhc_hw_reset(host->mmc);
+ else if (cmd->data)
+ /*
+ * Clear the FIFOs after completing data transfers to prevent
+ * corrupting data on write access. It's not clear why this is
+ * needed (for reads and writes), but it mimics what the BSP
+ * kernel did.
+ */
+ meson_mx_sdhc_clear_fifo(host->mmc);
+
+ meson_mx_sdhc_request_done(host);
+
+ return IRQ_HANDLED;
+}
+
+static void meson_mx_sdhc_init_hw_meson8(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+ regmap_write(host->regmap, MESON_SDHC_MISC,
+ FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 7) |
+ FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) |
+ FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2));
+
+ regmap_write(host->regmap, MESON_SDHC_ENHC,
+ FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 63) |
+ MESON_SDHC_ENHC_MESON6_DMA_WR_RESP |
+ FIELD_PREP(MESON_SDHC_ENHC_MESON6_RX_TIMEOUT, 255) |
+ FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12));
+};
+
+static void meson_mx_sdhc_set_pdma_meson8(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+ if (host->cmd->data->flags & MMC_DATA_WRITE)
+ regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_DMA_MODE |
+ MESON_SDHC_PDMA_RD_BURST |
+ MESON_SDHC_PDMA_TXFIFO_FILL,
+ MESON_SDHC_PDMA_DMA_MODE |
+ FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 31) |
+ MESON_SDHC_PDMA_TXFIFO_FILL);
+ else
+ regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_DMA_MODE |
+ MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
+ MESON_SDHC_PDMA_DMA_MODE |
+ FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
+ 1));
+
+ if (host->cmd->data->flags & MMC_DATA_WRITE)
+ regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_RD_BURST,
+ FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15));
+}
+
+static void meson_mx_sdhc_wait_before_send_meson8(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+ u32 val;
+ int ret;
+
+ ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, val,
+ val == 0,
+ MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US,
+ MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US);
+ if (ret)
+ dev_warn(mmc_dev(mmc),
+ "Failed to wait for ESTA to clear: 0x%08x\n", val);
+
+ if (host->cmd->data && host->cmd->data->flags & MMC_DATA_WRITE) {
+ ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT,
+ val, val & MESON_SDHC_STAT_TXFIFO_CNT,
+ MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US,
+ MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US);
+ if (ret)
+ dev_warn(mmc_dev(mmc),
+ "Failed to wait for TX FIFO to fill\n");
+ }
+}
+
+static void meson_mx_sdhc_init_hw_meson8m2(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+ regmap_write(host->regmap, MESON_SDHC_MISC,
+ FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 6) |
+ FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) |
+ FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2));
+
+ regmap_write(host->regmap, MESON_SDHC_ENHC,
+ FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 64) |
+ FIELD_PREP(MESON_SDHC_ENHC_MESON8M2_DEBUG, 1) |
+ MESON_SDHC_ENHC_MESON8M2_WRRSP_MODE |
+ FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12));
+}
+
+static void meson_mx_sdhc_set_pdma_meson8m2(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+ regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_DMA_MODE, MESON_SDHC_PDMA_DMA_MODE);
+}
+
+static void meson_mx_sdhc_init_hw(struct mmc_host *mmc)
+{
+ struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+
+ meson_mx_sdhc_hw_reset(mmc);
+
+ regmap_write(host->regmap, MESON_SDHC_CTRL,
+ FIELD_PREP(MESON_SDHC_CTRL_RX_PERIOD, 0xf) |
+ FIELD_PREP(MESON_SDHC_CTRL_RX_TIMEOUT, 0x7f) |
+ FIELD_PREP(MESON_SDHC_CTRL_RX_ENDIAN, 0x7) |
+ FIELD_PREP(MESON_SDHC_CTRL_TX_ENDIAN, 0x7));
+
+ /*
+ * start with a valid divider and enable the memory (un-setting
+ * MESON_SDHC_CLKC_MEM_PWR_OFF).
+ */
+ regmap_write(host->regmap, MESON_SDHC_CLKC, MESON_SDHC_CLKC_CLK_DIV);
+
+ regmap_write(host->regmap, MESON_SDHC_CLK2,
+ FIELD_PREP(MESON_SDHC_CLK2_SD_CLK_PHASE, 1));
+
+ regmap_write(host->regmap, MESON_SDHC_PDMA,
+ MESON_SDHC_PDMA_DMA_URGENT |
+ FIELD_PREP(MESON_SDHC_PDMA_WR_BURST, 7) |
+ FIELD_PREP(MESON_SDHC_PDMA_TXFIFO_TH, 49) |
+ FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15) |
+ FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_TH, 7));
+
+ /* some initialization bits depend on the SoC: */
+ host->platform->init_hw(mmc);
+
+ /* disable and mask all interrupts: */
+ regmap_write(host->regmap, MESON_SDHC_ICTL, 0);
+ regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS);
+}
+
+static int meson_mx_sdhc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct meson_mx_sdhc_host *host;
+ struct mmc_host *mmc;
+ void __iomem *base;
+ int ret, irq;
+
+ mmc = mmc_alloc_host(sizeof(*host), dev);
+ if (!mmc)
+ return -ENOMEM;
+
+ ret = devm_add_action_or_reset(dev, (void(*)(void *))mmc_free_host,
+ mmc);
+ if (ret) {
+ dev_err(dev, "Failed to register mmc_free_host action\n");
+ return ret;
+ }
+
+ host = mmc_priv(mmc);
+ host->mmc = mmc;
+
+ platform_set_drvdata(pdev, host);
+
+ host->platform = device_get_match_data(dev);
+ if (!host->platform)
+ return -EINVAL;
+
+ base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ host->regmap = devm_regmap_init_mmio(dev, base,
+ &meson_mx_sdhc_regmap_config);
+ if (IS_ERR(host->regmap))
+ return PTR_ERR(host->regmap);
+
+ host->pclk = devm_clk_get(dev, "pclk");
+ if (IS_ERR(host->pclk))
+ return PTR_ERR(host->pclk);
+
+ /* accessing any register requires the module clock to be enabled: */
+ ret = clk_prepare_enable(host->pclk);
+ if (ret) {
+ dev_err(dev, "Failed to enable 'pclk' clock\n");
+ return ret;
+ }
+
+ meson_mx_sdhc_init_hw(mmc);
+
+ ret = meson_mx_sdhc_register_clkc(dev, base, host->bulk_clks);
+ if (ret)
+ goto err_disable_pclk;
+
+ host->sd_clk = host->bulk_clks[1].clk;
+
+ /* Get regulators and the supported OCR mask */
+ ret = mmc_regulator_get_supply(mmc);
+ if (ret)
+ goto err_disable_pclk;
+
+ mmc->max_req_size = SZ_128K;
+ mmc->max_seg_size = mmc->max_req_size;
+ mmc->max_blk_count = FIELD_GET(MESON_SDHC_SEND_TOTAL_PACK, ~0);
+ mmc->max_blk_size = MESON_SDHC_MAX_BLK_SIZE;
+ mmc->max_busy_timeout = 30 * MSEC_PER_SEC;
+ mmc->f_min = clk_round_rate(host->sd_clk, 1);
+ mmc->f_max = clk_round_rate(host->sd_clk, ULONG_MAX);
+ mmc->max_current_180 = 300;
+ mmc->max_current_330 = 300;
+ mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_HW_RESET;
+ mmc->ops = &meson_mx_sdhc_ops;
+
+ ret = mmc_of_parse(mmc);
+ if (ret)
+ goto err_disable_pclk;
+
+ irq = platform_get_irq(pdev, 0);
+ ret = devm_request_threaded_irq(dev, irq, meson_mx_sdhc_irq,
+ meson_mx_sdhc_irq_thread, IRQF_ONESHOT,
+ NULL, host);
+ if (ret)
+ goto err_disable_pclk;
+
+ ret = mmc_add_host(mmc);
+ if (ret)
+ goto err_disable_pclk;
+
+ return 0;
+
+err_disable_pclk:
+ clk_disable_unprepare(host->pclk);
+ return ret;
+}
+
+static int meson_mx_sdhc_remove(struct platform_device *pdev)
+{
+ struct meson_mx_sdhc_host *host = platform_get_drvdata(pdev);
+
+ mmc_remove_host(host->mmc);
+
+ meson_mx_sdhc_disable_clks(host->mmc);
+
+ clk_disable_unprepare(host->pclk);
+
+ return 0;
+}
+
+static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8 = {
+ .init_hw = meson_mx_sdhc_init_hw_meson8,
+ .set_pdma = meson_mx_sdhc_set_pdma_meson8,
+ .wait_before_send = meson_mx_sdhc_wait_before_send_meson8,
+ .hardware_flush_all_cmds = false,
+};
+
+static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8m2 = {
+ .init_hw = meson_mx_sdhc_init_hw_meson8m2,
+ .set_pdma = meson_mx_sdhc_set_pdma_meson8m2,
+ .hardware_flush_all_cmds = true,
+};
+
+static const struct of_device_id meson_mx_sdhc_of_match[] = {
+ {
+ .compatible = "amlogic,meson8-sdhc",
+ .data = &meson_mx_sdhc_data_meson8
+ },
+ {
+ .compatible = "amlogic,meson8b-sdhc",
+ .data = &meson_mx_sdhc_data_meson8
+ },
+ {
+ .compatible = "amlogic,meson8m2-sdhc",
+ .data = &meson_mx_sdhc_data_meson8m2
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, meson_mx_sdhc_of_match);
+
+static struct platform_driver meson_mx_sdhc_driver = {
+ .probe = meson_mx_sdhc_probe,
+ .remove = meson_mx_sdhc_remove,
+ .driver = {
+ .name = "meson-mx-sdhc",
+ .of_match_table = of_match_ptr(meson_mx_sdhc_of_match),
+ },
+};
+
+module_platform_driver(meson_mx_sdhc_driver);
+
+MODULE_DESCRIPTION("Meson6, Meson8, Meson8b and Meson8m2 SDHC Host Driver");
+MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
+MODULE_LICENSE("GPL v2");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Amlogic Meson6/Meson8/Meson8b/Meson8m2 SDHC MMC host controller driver.
- *
- * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
- */
-
-#include <linux/clk.h>
-#include <linux/device.h>
-#include <linux/dma-mapping.h>
-#include <linux/interrupt.h>
-#include <linux/iopoll.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-#include <linux/property.h>
-#include <linux/regmap.h>
-#include <linux/regulator/consumer.h>
-#include <linux/types.h>
-
-#include <linux/mmc/host.h>
-#include <linux/mmc/mmc.h>
-#include <linux/mmc/sdio.h>
-#include <linux/mmc/slot-gpio.h>
-
-#include "meson-mx-sdhc.h"
-
-#define MESON_SDHC_NUM_BULK_CLKS 4
-#define MESON_SDHC_MAX_BLK_SIZE 512
-#define MESON_SDHC_NUM_TUNING_TRIES 10
-
-#define MESON_SDHC_WAIT_CMD_READY_SLEEP_US 1
-#define MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US 100000
-#define MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US 1
-#define MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US 200
-
-struct meson_mx_sdhc_data {
- void (*init_hw)(struct mmc_host *mmc);
- void (*set_pdma)(struct mmc_host *mmc);
- void (*wait_before_send)(struct mmc_host *mmc);
- bool hardware_flush_all_cmds;
-};
-
-struct meson_mx_sdhc_host {
- struct mmc_host *mmc;
-
- struct mmc_request *mrq;
- struct mmc_command *cmd;
- int error;
-
- struct regmap *regmap;
-
- struct clk *pclk;
- struct clk *sd_clk;
- struct clk_bulk_data bulk_clks[MESON_SDHC_NUM_BULK_CLKS];
- bool bulk_clks_enabled;
-
- const struct meson_mx_sdhc_data *platform;
-};
-
-static const struct regmap_config meson_mx_sdhc_regmap_config = {
- .reg_bits = 8,
- .val_bits = 32,
- .reg_stride = 4,
- .max_register = MESON_SDHC_CLK2,
-};
-
-static void meson_mx_sdhc_hw_reset(struct mmc_host *mmc)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
-
- regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_MAIN_CTRL |
- MESON_SDHC_SRST_RXFIFO | MESON_SDHC_SRST_TXFIFO |
- MESON_SDHC_SRST_DPHY_RX | MESON_SDHC_SRST_DPHY_TX |
- MESON_SDHC_SRST_DMA_IF);
- usleep_range(10, 100);
-
- regmap_write(host->regmap, MESON_SDHC_SRST, 0);
- usleep_range(10, 100);
-}
-
-static void meson_mx_sdhc_clear_fifo(struct mmc_host *mmc)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
- u32 stat;
-
- regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
- if (!FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) &&
- !FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat))
- return;
-
- regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_RXFIFO |
- MESON_SDHC_SRST_TXFIFO | MESON_SDHC_SRST_MAIN_CTRL);
- udelay(5);
-
- regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
- if (FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) ||
- FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat))
- dev_warn(mmc_dev(host->mmc),
- "Failed to clear FIFOs, RX: %lu, TX: %lu\n",
- FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat),
- FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat));
-}
-
-static void meson_mx_sdhc_wait_cmd_ready(struct mmc_host *mmc)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
- u32 stat, esta;
- int ret;
-
- ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT, stat,
- !(stat & MESON_SDHC_STAT_CMD_BUSY),
- MESON_SDHC_WAIT_CMD_READY_SLEEP_US,
- MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US);
- if (ret) {
- dev_warn(mmc_dev(mmc),
- "Failed to poll for CMD_BUSY while processing CMD%d\n",
- host->cmd->opcode);
- meson_mx_sdhc_hw_reset(mmc);
- }
-
- ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, esta,
- !(esta & MESON_SDHC_ESTA_11_13),
- MESON_SDHC_WAIT_CMD_READY_SLEEP_US,
- MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US);
- if (ret) {
- dev_warn(mmc_dev(mmc),
- "Failed to poll for ESTA[13:11] while processing CMD%d\n",
- host->cmd->opcode);
- meson_mx_sdhc_hw_reset(mmc);
- }
-}
-
-static void meson_mx_sdhc_start_cmd(struct mmc_host *mmc,
- struct mmc_command *cmd)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
- u32 ictl, send;
- int pack_len;
-
- host->cmd = cmd;
-
- ictl = MESON_SDHC_ICTL_DATA_TIMEOUT | MESON_SDHC_ICTL_DATA_ERR_CRC |
- MESON_SDHC_ICTL_RXFIFO_FULL | MESON_SDHC_ICTL_TXFIFO_EMPTY |
- MESON_SDHC_ICTL_RESP_TIMEOUT | MESON_SDHC_ICTL_RESP_ERR_CRC;
-
- send = FIELD_PREP(MESON_SDHC_SEND_CMD_INDEX, cmd->opcode);
-
- if (cmd->data) {
- send |= MESON_SDHC_SEND_CMD_HAS_DATA;
- send |= FIELD_PREP(MESON_SDHC_SEND_TOTAL_PACK,
- cmd->data->blocks - 1);
-
- if (cmd->data->blksz < MESON_SDHC_MAX_BLK_SIZE)
- pack_len = cmd->data->blksz;
- else
- pack_len = 0;
-
- if (cmd->data->flags & MMC_DATA_WRITE)
- send |= MESON_SDHC_SEND_DATA_DIR;
-
- /*
- * If command with no data, just wait response done
- * interrupt(int[0]), and if command with data transfer, just
- * wait dma done interrupt(int[11]), don't need care about
- * dat0 busy or not.
- */
- if (host->platform->hardware_flush_all_cmds ||
- cmd->data->flags & MMC_DATA_WRITE)
- /* hardware flush: */
- ictl |= MESON_SDHC_ICTL_DMA_DONE;
- else
- /* software flush: */
- ictl |= MESON_SDHC_ICTL_DATA_XFER_OK;
- } else {
- pack_len = 0;
-
- ictl |= MESON_SDHC_ICTL_RESP_OK;
- }
-
- if (cmd->opcode == MMC_STOP_TRANSMISSION)
- send |= MESON_SDHC_SEND_DATA_STOP;
-
- if (cmd->flags & MMC_RSP_PRESENT)
- send |= MESON_SDHC_SEND_CMD_HAS_RESP;
-
- if (cmd->flags & MMC_RSP_136) {
- send |= MESON_SDHC_SEND_RESP_LEN;
- send |= MESON_SDHC_SEND_RESP_NO_CRC;
- }
-
- if (!(cmd->flags & MMC_RSP_CRC))
- send |= MESON_SDHC_SEND_RESP_NO_CRC;
-
- if (cmd->flags & MMC_RSP_BUSY)
- send |= MESON_SDHC_SEND_R1B;
-
- /* enable the new IRQs and mask all pending ones */
- regmap_write(host->regmap, MESON_SDHC_ICTL, ictl);
- regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS);
-
- regmap_write(host->regmap, MESON_SDHC_ARGU, cmd->arg);
-
- regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
- MESON_SDHC_CTRL_PACK_LEN,
- FIELD_PREP(MESON_SDHC_CTRL_PACK_LEN, pack_len));
-
- if (cmd->data)
- regmap_write(host->regmap, MESON_SDHC_ADDR,
- sg_dma_address(cmd->data->sg));
-
- meson_mx_sdhc_wait_cmd_ready(mmc);
-
- if (cmd->data)
- host->platform->set_pdma(mmc);
-
- if (host->platform->wait_before_send)
- host->platform->wait_before_send(mmc);
-
- regmap_write(host->regmap, MESON_SDHC_SEND, send);
-}
-
-static void meson_mx_sdhc_disable_clks(struct mmc_host *mmc)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
-
- if (!host->bulk_clks_enabled)
- return;
-
- clk_bulk_disable_unprepare(MESON_SDHC_NUM_BULK_CLKS, host->bulk_clks);
-
- host->bulk_clks_enabled = false;
-}
-
-static int meson_mx_sdhc_enable_clks(struct mmc_host *mmc)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
- int ret;
-
- if (host->bulk_clks_enabled)
- return 0;
-
- ret = clk_bulk_prepare_enable(MESON_SDHC_NUM_BULK_CLKS,
- host->bulk_clks);
- if (ret)
- return ret;
-
- host->bulk_clks_enabled = true;
-
- return 0;
-}
-
-static int meson_mx_sdhc_set_clk(struct mmc_host *mmc, struct mmc_ios *ios)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
- u32 rx_clk_phase;
- int ret;
-
- meson_mx_sdhc_disable_clks(mmc);
-
- if (ios->clock) {
- ret = clk_set_rate(host->sd_clk, ios->clock);
- if (ret) {
- dev_warn(mmc_dev(mmc),
- "Failed to set MMC clock to %uHz: %d\n",
- ios->clock, host->error);
- return ret;
- }
-
- ret = meson_mx_sdhc_enable_clks(mmc);
- if (ret)
- return ret;
-
- mmc->actual_clock = clk_get_rate(host->sd_clk);
-
- /*
- * according to Amlogic the following latching points are
- * selected with empirical values, there is no (known) formula
- * to calculate these.
- */
- if (mmc->actual_clock > 100000000) {
- rx_clk_phase = 1;
- } else if (mmc->actual_clock > 45000000) {
- if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
- rx_clk_phase = 15;
- else
- rx_clk_phase = 11;
- } else if (mmc->actual_clock >= 25000000) {
- rx_clk_phase = 15;
- } else if (mmc->actual_clock > 5000000) {
- rx_clk_phase = 23;
- } else if (mmc->actual_clock > 1000000) {
- rx_clk_phase = 55;
- } else {
- rx_clk_phase = 1061;
- }
-
- regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
- MESON_SDHC_CLK2_RX_CLK_PHASE,
- FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
- rx_clk_phase));
- } else {
- mmc->actual_clock = 0;
- }
-
- return 0;
-}
-
-static void meson_mx_sdhc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
- unsigned short vdd = ios->vdd;
-
- switch (ios->power_mode) {
- case MMC_POWER_OFF:
- vdd = 0;
- fallthrough;
-
- case MMC_POWER_UP:
- if (!IS_ERR(mmc->supply.vmmc)) {
- host->error = mmc_regulator_set_ocr(mmc,
- mmc->supply.vmmc,
- vdd);
- if (host->error)
- return;
- }
-
- break;
-
- case MMC_POWER_ON:
- break;
- }
-
- host->error = meson_mx_sdhc_set_clk(mmc, ios);
- if (host->error)
- return;
-
- switch (ios->bus_width) {
- case MMC_BUS_WIDTH_1:
- regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
- MESON_SDHC_CTRL_DAT_TYPE,
- FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 0));
- break;
-
- case MMC_BUS_WIDTH_4:
- regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
- MESON_SDHC_CTRL_DAT_TYPE,
- FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 1));
- break;
-
- case MMC_BUS_WIDTH_8:
- regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
- MESON_SDHC_CTRL_DAT_TYPE,
- FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 2));
- break;
-
- default:
- dev_err(mmc_dev(mmc), "unsupported bus width: %d\n",
- ios->bus_width);
- host->error = -EINVAL;
- return;
- }
-}
-
-static int meson_mx_sdhc_map_dma(struct mmc_host *mmc, struct mmc_request *mrq)
-{
- struct mmc_data *data = mrq->data;
- int dma_len;
-
- if (!data)
- return 0;
-
- dma_len = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len,
- mmc_get_dma_dir(data));
- if (dma_len <= 0) {
- dev_err(mmc_dev(mmc), "dma_map_sg failed\n");
- return -ENOMEM;
- }
-
- return 0;
-}
-
-static void meson_mx_sdhc_request(struct mmc_host *mmc, struct mmc_request *mrq)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
- struct mmc_command *cmd = mrq->cmd;
-
- if (!host->error)
- host->error = meson_mx_sdhc_map_dma(mmc, mrq);
-
- if (host->error) {
- cmd->error = host->error;
- mmc_request_done(mmc, mrq);
- return;
- }
-
- host->mrq = mrq;
-
- meson_mx_sdhc_start_cmd(mmc, mrq->cmd);
-}
-
-static int meson_mx_sdhc_card_busy(struct mmc_host *mmc)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
- u32 stat;
-
- regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
- return FIELD_GET(MESON_SDHC_STAT_DAT3_0, stat) == 0;
-}
-
-static bool meson_mx_sdhc_tuning_point_matches(struct mmc_host *mmc,
- u32 opcode)
-{
- unsigned int i, num_matches = 0;
- int ret;
-
- for (i = 0; i < MESON_SDHC_NUM_TUNING_TRIES; i++) {
- ret = mmc_send_tuning(mmc, opcode, NULL);
- if (!ret)
- num_matches++;
- }
-
- return num_matches == MESON_SDHC_NUM_TUNING_TRIES;
-}
-
-static int meson_mx_sdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
- int div, start, len, best_start, best_len;
- int curr_phase, old_phase, new_phase;
- u32 val;
-
- len = 0;
- start = 0;
- best_len = 0;
-
- regmap_read(host->regmap, MESON_SDHC_CLK2, &val);
- old_phase = FIELD_GET(MESON_SDHC_CLK2_RX_CLK_PHASE, val);
-
- regmap_read(host->regmap, MESON_SDHC_CLKC, &val);
- div = FIELD_GET(MESON_SDHC_CLKC_CLK_DIV, val);
-
- for (curr_phase = 0; curr_phase <= div; curr_phase++) {
- regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
- MESON_SDHC_CLK2_RX_CLK_PHASE,
- FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
- curr_phase));
-
- if (meson_mx_sdhc_tuning_point_matches(mmc, opcode)) {
- if (!len) {
- start = curr_phase;
-
- dev_dbg(mmc_dev(mmc),
- "New RX phase window starts at %u\n",
- start);
- }
-
- len++;
- } else {
- if (len > best_len) {
- best_start = start;
- best_len = len;
-
- dev_dbg(mmc_dev(mmc),
- "New best RX phase window: %u - %u\n",
- best_start, best_start + best_len);
- }
-
- /* reset the current window */
- len = 0;
- }
- }
-
- if (len > best_len)
- /* the last window is the best (or possibly only) window */
- new_phase = start + (len / 2);
- else if (best_len)
- /* there was a better window than the last */
- new_phase = best_start + (best_len / 2);
- else
- /* no window was found at all, reset to the original phase */
- new_phase = old_phase;
-
- regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
- MESON_SDHC_CLK2_RX_CLK_PHASE,
- FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
- new_phase));
-
- if (!len && !best_len)
- return -EIO;
-
- dev_dbg(mmc_dev(mmc), "Tuned RX clock phase to %u\n", new_phase);
-
- return 0;
-}
-
-static const struct mmc_host_ops meson_mx_sdhc_ops = {
- .hw_reset = meson_mx_sdhc_hw_reset,
- .request = meson_mx_sdhc_request,
- .set_ios = meson_mx_sdhc_set_ios,
- .card_busy = meson_mx_sdhc_card_busy,
- .execute_tuning = meson_mx_sdhc_execute_tuning,
- .get_cd = mmc_gpio_get_cd,
- .get_ro = mmc_gpio_get_ro,
-};
-
-static void meson_mx_sdhc_request_done(struct meson_mx_sdhc_host *host)
-{
- struct mmc_request *mrq = host->mrq;
- struct mmc_host *mmc = host->mmc;
-
- /* disable interrupts and mask all pending ones */
- regmap_update_bits(host->regmap, MESON_SDHC_ICTL,
- MESON_SDHC_ICTL_ALL_IRQS, 0);
- regmap_update_bits(host->regmap, MESON_SDHC_ISTA,
- MESON_SDHC_ISTA_ALL_IRQS, MESON_SDHC_ISTA_ALL_IRQS);
-
- host->mrq = NULL;
- host->cmd = NULL;
-
- mmc_request_done(mmc, mrq);
-}
-
-static u32 meson_mx_sdhc_read_response(struct meson_mx_sdhc_host *host, u8 idx)
-{
- u32 val;
-
- regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
- MESON_SDHC_PDMA_DMA_MODE, 0);
-
- regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
- MESON_SDHC_PDMA_PIO_RDRESP,
- FIELD_PREP(MESON_SDHC_PDMA_PIO_RDRESP, idx));
-
- regmap_read(host->regmap, MESON_SDHC_ARGU, &val);
-
- return val;
-}
-
-static irqreturn_t meson_mx_sdhc_irq(int irq, void *data)
-{
- struct meson_mx_sdhc_host *host = data;
- struct mmc_command *cmd = host->cmd;
- u32 ictl, ista;
-
- regmap_read(host->regmap, MESON_SDHC_ICTL, &ictl);
- regmap_read(host->regmap, MESON_SDHC_ISTA, &ista);
-
- if (!(ictl & ista))
- return IRQ_NONE;
-
- if (ista & MESON_SDHC_ISTA_RXFIFO_FULL ||
- ista & MESON_SDHC_ISTA_TXFIFO_EMPTY)
- cmd->error = -EIO;
- else if (ista & MESON_SDHC_ISTA_RESP_ERR_CRC)
- cmd->error = -EILSEQ;
- else if (ista & MESON_SDHC_ISTA_RESP_TIMEOUT)
- cmd->error = -ETIMEDOUT;
-
- if (cmd->data) {
- if (ista & MESON_SDHC_ISTA_DATA_ERR_CRC)
- cmd->data->error = -EILSEQ;
- else if (ista & MESON_SDHC_ISTA_DATA_TIMEOUT)
- cmd->data->error = -ETIMEDOUT;
- }
-
- if (cmd->error || (cmd->data && cmd->data->error))
- dev_dbg(mmc_dev(host->mmc), "CMD%d error, ISTA: 0x%08x\n",
- cmd->opcode, ista);
-
- return IRQ_WAKE_THREAD;
-}
-
-static irqreturn_t meson_mx_sdhc_irq_thread(int irq, void *irq_data)
-{
- struct meson_mx_sdhc_host *host = irq_data;
- struct mmc_command *cmd;
- u32 val;
-
- cmd = host->cmd;
- if (WARN_ON(!cmd))
- return IRQ_HANDLED;
-
- if (cmd->data && !cmd->data->error) {
- if (!host->platform->hardware_flush_all_cmds &&
- cmd->data->flags & MMC_DATA_READ) {
- meson_mx_sdhc_wait_cmd_ready(host->mmc);
-
- val = FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
- 2);
- regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
- MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
- val);
- }
-
- dma_unmap_sg(mmc_dev(host->mmc), cmd->data->sg,
- cmd->data->sg_len, mmc_get_dma_dir(cmd->data));
-
- cmd->data->bytes_xfered = cmd->data->blksz * cmd->data->blocks;
- }
-
- meson_mx_sdhc_wait_cmd_ready(host->mmc);
-
- if (cmd->flags & MMC_RSP_136) {
- cmd->resp[0] = meson_mx_sdhc_read_response(host, 4);
- cmd->resp[1] = meson_mx_sdhc_read_response(host, 3);
- cmd->resp[2] = meson_mx_sdhc_read_response(host, 2);
- cmd->resp[3] = meson_mx_sdhc_read_response(host, 1);
- } else {
- cmd->resp[0] = meson_mx_sdhc_read_response(host, 0);
- }
-
- if (cmd->error == -EIO || cmd->error == -ETIMEDOUT)
- meson_mx_sdhc_hw_reset(host->mmc);
- else if (cmd->data)
- /*
- * Clear the FIFOs after completing data transfers to prevent
- * corrupting data on write access. It's not clear why this is
- * needed (for reads and writes), but it mimics what the BSP
- * kernel did.
- */
- meson_mx_sdhc_clear_fifo(host->mmc);
-
- meson_mx_sdhc_request_done(host);
-
- return IRQ_HANDLED;
-}
-
-static void meson_mx_sdhc_init_hw_meson8(struct mmc_host *mmc)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
-
- regmap_write(host->regmap, MESON_SDHC_MISC,
- FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 7) |
- FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) |
- FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2));
-
- regmap_write(host->regmap, MESON_SDHC_ENHC,
- FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 63) |
- MESON_SDHC_ENHC_MESON6_DMA_WR_RESP |
- FIELD_PREP(MESON_SDHC_ENHC_MESON6_RX_TIMEOUT, 255) |
- FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12));
-};
-
-static void meson_mx_sdhc_set_pdma_meson8(struct mmc_host *mmc)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
-
- if (host->cmd->data->flags & MMC_DATA_WRITE)
- regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
- MESON_SDHC_PDMA_DMA_MODE |
- MESON_SDHC_PDMA_RD_BURST |
- MESON_SDHC_PDMA_TXFIFO_FILL,
- MESON_SDHC_PDMA_DMA_MODE |
- FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 31) |
- MESON_SDHC_PDMA_TXFIFO_FILL);
- else
- regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
- MESON_SDHC_PDMA_DMA_MODE |
- MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
- MESON_SDHC_PDMA_DMA_MODE |
- FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
- 1));
-
- if (host->cmd->data->flags & MMC_DATA_WRITE)
- regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
- MESON_SDHC_PDMA_RD_BURST,
- FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15));
-}
-
-static void meson_mx_sdhc_wait_before_send_meson8(struct mmc_host *mmc)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
- u32 val;
- int ret;
-
- ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, val,
- val == 0,
- MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US,
- MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US);
- if (ret)
- dev_warn(mmc_dev(mmc),
- "Failed to wait for ESTA to clear: 0x%08x\n", val);
-
- if (host->cmd->data && host->cmd->data->flags & MMC_DATA_WRITE) {
- ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT,
- val, val & MESON_SDHC_STAT_TXFIFO_CNT,
- MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US,
- MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US);
- if (ret)
- dev_warn(mmc_dev(mmc),
- "Failed to wait for TX FIFO to fill\n");
- }
-}
-
-static void meson_mx_sdhc_init_hw_meson8m2(struct mmc_host *mmc)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
-
- regmap_write(host->regmap, MESON_SDHC_MISC,
- FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 6) |
- FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) |
- FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2));
-
- regmap_write(host->regmap, MESON_SDHC_ENHC,
- FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 64) |
- FIELD_PREP(MESON_SDHC_ENHC_MESON8M2_DEBUG, 1) |
- MESON_SDHC_ENHC_MESON8M2_WRRSP_MODE |
- FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12));
-}
-
-static void meson_mx_sdhc_set_pdma_meson8m2(struct mmc_host *mmc)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
-
- regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
- MESON_SDHC_PDMA_DMA_MODE, MESON_SDHC_PDMA_DMA_MODE);
-}
-
-static void meson_mx_sdhc_init_hw(struct mmc_host *mmc)
-{
- struct meson_mx_sdhc_host *host = mmc_priv(mmc);
-
- meson_mx_sdhc_hw_reset(mmc);
-
- regmap_write(host->regmap, MESON_SDHC_CTRL,
- FIELD_PREP(MESON_SDHC_CTRL_RX_PERIOD, 0xf) |
- FIELD_PREP(MESON_SDHC_CTRL_RX_TIMEOUT, 0x7f) |
- FIELD_PREP(MESON_SDHC_CTRL_RX_ENDIAN, 0x7) |
- FIELD_PREP(MESON_SDHC_CTRL_TX_ENDIAN, 0x7));
-
- /*
- * start with a valid divider and enable the memory (un-setting
- * MESON_SDHC_CLKC_MEM_PWR_OFF).
- */
- regmap_write(host->regmap, MESON_SDHC_CLKC, MESON_SDHC_CLKC_CLK_DIV);
-
- regmap_write(host->regmap, MESON_SDHC_CLK2,
- FIELD_PREP(MESON_SDHC_CLK2_SD_CLK_PHASE, 1));
-
- regmap_write(host->regmap, MESON_SDHC_PDMA,
- MESON_SDHC_PDMA_DMA_URGENT |
- FIELD_PREP(MESON_SDHC_PDMA_WR_BURST, 7) |
- FIELD_PREP(MESON_SDHC_PDMA_TXFIFO_TH, 49) |
- FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15) |
- FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_TH, 7));
-
- /* some initialization bits depend on the SoC: */
- host->platform->init_hw(mmc);
-
- /* disable and mask all interrupts: */
- regmap_write(host->regmap, MESON_SDHC_ICTL, 0);
- regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS);
-}
-
-static int meson_mx_sdhc_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct meson_mx_sdhc_host *host;
- struct mmc_host *mmc;
- void __iomem *base;
- int ret, irq;
-
- mmc = mmc_alloc_host(sizeof(*host), dev);
- if (!mmc)
- return -ENOMEM;
-
- ret = devm_add_action_or_reset(dev, (void(*)(void *))mmc_free_host,
- mmc);
- if (ret) {
- dev_err(dev, "Failed to register mmc_free_host action\n");
- return ret;
- }
-
- host = mmc_priv(mmc);
- host->mmc = mmc;
-
- platform_set_drvdata(pdev, host);
-
- host->platform = device_get_match_data(dev);
- if (!host->platform)
- return -EINVAL;
-
- base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(base))
- return PTR_ERR(base);
-
- host->regmap = devm_regmap_init_mmio(dev, base,
- &meson_mx_sdhc_regmap_config);
- if (IS_ERR(host->regmap))
- return PTR_ERR(host->regmap);
-
- host->pclk = devm_clk_get(dev, "pclk");
- if (IS_ERR(host->pclk))
- return PTR_ERR(host->pclk);
-
- /* accessing any register requires the module clock to be enabled: */
- ret = clk_prepare_enable(host->pclk);
- if (ret) {
- dev_err(dev, "Failed to enable 'pclk' clock\n");
- return ret;
- }
-
- meson_mx_sdhc_init_hw(mmc);
-
- ret = meson_mx_sdhc_register_clkc(dev, base, host->bulk_clks);
- if (ret)
- goto err_disable_pclk;
-
- host->sd_clk = host->bulk_clks[1].clk;
-
- /* Get regulators and the supported OCR mask */
- ret = mmc_regulator_get_supply(mmc);
- if (ret)
- goto err_disable_pclk;
-
- mmc->max_req_size = SZ_128K;
- mmc->max_seg_size = mmc->max_req_size;
- mmc->max_blk_count = FIELD_GET(MESON_SDHC_SEND_TOTAL_PACK, ~0);
- mmc->max_blk_size = MESON_SDHC_MAX_BLK_SIZE;
- mmc->max_busy_timeout = 30 * MSEC_PER_SEC;
- mmc->f_min = clk_round_rate(host->sd_clk, 1);
- mmc->f_max = clk_round_rate(host->sd_clk, ULONG_MAX);
- mmc->max_current_180 = 300;
- mmc->max_current_330 = 300;
- mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_HW_RESET;
- mmc->ops = &meson_mx_sdhc_ops;
-
- ret = mmc_of_parse(mmc);
- if (ret)
- goto err_disable_pclk;
-
- irq = platform_get_irq(pdev, 0);
- ret = devm_request_threaded_irq(dev, irq, meson_mx_sdhc_irq,
- meson_mx_sdhc_irq_thread, IRQF_ONESHOT,
- NULL, host);
- if (ret)
- goto err_disable_pclk;
-
- ret = mmc_add_host(mmc);
- if (ret)
- goto err_disable_pclk;
-
- return 0;
-
-err_disable_pclk:
- clk_disable_unprepare(host->pclk);
- return ret;
-}
-
-static int meson_mx_sdhc_remove(struct platform_device *pdev)
-{
- struct meson_mx_sdhc_host *host = platform_get_drvdata(pdev);
-
- mmc_remove_host(host->mmc);
-
- meson_mx_sdhc_disable_clks(host->mmc);
-
- clk_disable_unprepare(host->pclk);
-
- return 0;
-}
-
-static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8 = {
- .init_hw = meson_mx_sdhc_init_hw_meson8,
- .set_pdma = meson_mx_sdhc_set_pdma_meson8,
- .wait_before_send = meson_mx_sdhc_wait_before_send_meson8,
- .hardware_flush_all_cmds = false,
-};
-
-static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8m2 = {
- .init_hw = meson_mx_sdhc_init_hw_meson8m2,
- .set_pdma = meson_mx_sdhc_set_pdma_meson8m2,
- .hardware_flush_all_cmds = true,
-};
-
-static const struct of_device_id meson_mx_sdhc_of_match[] = {
- {
- .compatible = "amlogic,meson8-sdhc",
- .data = &meson_mx_sdhc_data_meson8
- },
- {
- .compatible = "amlogic,meson8b-sdhc",
- .data = &meson_mx_sdhc_data_meson8
- },
- {
- .compatible = "amlogic,meson8m2-sdhc",
- .data = &meson_mx_sdhc_data_meson8m2
- },
- { /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, meson_mx_sdhc_of_match);
-
-static struct platform_driver meson_mx_sdhc_driver = {
- .probe = meson_mx_sdhc_probe,
- .remove = meson_mx_sdhc_remove,
- .driver = {
- .name = "meson-mx-sdhc",
- .of_match_table = of_match_ptr(meson_mx_sdhc_of_match),
- },
-};
-
-module_platform_driver(meson_mx_sdhc_driver);
-
-MODULE_DESCRIPTION("Meson6, Meson8, Meson8b and Meson8m2 SDHC Host Driver");
-MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
-MODULE_LICENSE("GPL v2");
projects / kernel.git / commitdiff