[PATCH v2 7/7] mci: Add dwcmshc-sdhci driver
Jules Maselbas
jmaselbas at kalray.eu
Wed Aug 16 02:39:45 PDT 2023
The dwcmshc driver started as a modification of the dove-sdhci driver.
This new dwcmshc driver has been heavily reworked to be closer to the
rockchip-dwcmshc-sdhci driver, both drivers are for the same IP from
Synopsys DesignWare Cores.
This new dwcmshc driver use new features introduced in common sdhci code,
mainly to support v4_mode and 64-bit DMA.
Signed-off-by: Jules Maselbas <jmaselbas at kalray.eu>
---
changes in v2:
- squashed both driver commit into one: the driver is introduced after
the common sdhci code is modified.
drivers/mci/Kconfig | 8 +
drivers/mci/Makefile | 1 +
drivers/mci/dwcmshc-sdhci.c | 360 ++++++++++++++++++++++++++++++++++++
3 files changed, 369 insertions(+)
create mode 100644 drivers/mci/dwcmshc-sdhci.c
diff --git a/drivers/mci/Kconfig b/drivers/mci/Kconfig
index bbdca67e9d..1fde0c8ffe 100644
--- a/drivers/mci/Kconfig
+++ b/drivers/mci/Kconfig
@@ -58,6 +58,14 @@ config MCI_MMC_GPP_PARTITIONS
comment "--- MCI host drivers ---"
+config MCI_DWC_MSHC
+ bool "Synopsys DesignWare Cores MSHC"
+ depends on HAS_DMA
+ select MCI_SDHCI
+ help
+ This selects support for the Synopsys DesignWare Mobile Storage Host Controller
+ block (DWC_mshc), this provides host support for SD/eMMC interfaces, in SDMA mode.
+
config MCI_DW
bool "Synopsys DesignWare Memory Card Interface"
depends on HAS_DMA
diff --git a/drivers/mci/Makefile b/drivers/mci/Makefile
index e3dc5ad8ae..35d11fb439 100644
--- a/drivers/mci/Makefile
+++ b/drivers/mci/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_MCI_ROCKCHIP_DWCMSHC) += rockchip-dwcmshc-sdhci.o
obj-$(CONFIG_MCI_TEGRA) += tegra-sdmmc.o
obj-$(CONFIG_MCI_SPI) += mci_spi.o
obj-$(CONFIG_MCI_DW) += dw_mmc.o
+obj-$(CONFIG_MCI_DWC_MSHC) += dwcmshc-sdhci.o
obj-$(CONFIG_MCI_MMCI) += mmci.o
obj-$(CONFIG_MCI_STM32_SDMMC2) += stm32_sdmmc2.o
obj-pbl-$(CONFIG_MCI_SDHCI) += sdhci.o
diff --git a/drivers/mci/dwcmshc-sdhci.c b/drivers/mci/dwcmshc-sdhci.c
new file mode 100644
index 0000000000..a95e3bd1e9
--- /dev/null
+++ b/drivers/mci/dwcmshc-sdhci.c
@@ -0,0 +1,360 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// SPDX-FileCopyrightText: 2019 Yann Sionneau, Kalray Inc.
+// SPDX-FileCopyrightText: 2023 Jules Maselbas, Kalray Inc.
+
+#include <clock.h>
+#include <common.h>
+#include <init.h>
+#include <io.h>
+#include <dma.h>
+#include <malloc.h>
+#include <mci.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+
+#include "sdhci.h"
+
+#define CARD_STATUS_MASK (0x1e00)
+#define CARD_STATUS_TRAN (4 << 9)
+static int dwcmshc_mci_send_cmd(struct mci_host *mci, struct mci_cmd *cmd,
+ struct mci_data *data);
+
+struct dwcmshc_host {
+ struct mci_host mci;
+ struct sdhci sdhci;
+ unsigned int in_abort_sequence;
+};
+
+#define priv_from_mci_host(h) container_of(h, struct dwcmshc_host, mci)
+
+static void mci_setup_cmd(struct mci_cmd *p, unsigned int cmd, unsigned int arg,
+ unsigned int response)
+{
+ p->cmdidx = cmd;
+ p->cmdarg = arg;
+ p->resp_type = response;
+}
+
+static int do_abort_sequence(struct mci_host *mci, struct mci_cmd *current_cmd)
+{
+ int ret = 0;
+ struct dwcmshc_host *host = priv_from_mci_host(mci);
+ struct mci_cmd cmd;
+ u64 start;
+
+ host->in_abort_sequence = 1;
+
+ mci_setup_cmd(&cmd, MMC_CMD_STOP_TRANSMISSION, 0, MMC_RSP_R1b);
+ ret = dwcmshc_mci_send_cmd(mci, &cmd, NULL);
+ if (ret) {
+ dev_err(host->mci.hw_dev, "Abort failed at first cmd12!\n");
+ goto out;
+ }
+ mci_setup_cmd(&cmd, MMC_CMD_SEND_STATUS, mci->mci->rca << 16,
+ MMC_RSP_R1);
+ ret = dwcmshc_mci_send_cmd(mci, &cmd, NULL);
+ if (ret) {
+ dev_err(host->mci.hw_dev, "Abort failed at first cmd13!\n");
+ goto out;
+ }
+
+ if ((cmd.response[0] & CARD_STATUS_MASK) == CARD_STATUS_TRAN)
+ goto out; /* All is OK! */
+
+ mci_setup_cmd(&cmd, MMC_CMD_STOP_TRANSMISSION, 0, MMC_RSP_R1b);
+ ret = dwcmshc_mci_send_cmd(mci, &cmd, NULL);
+ if (ret) {
+ dev_err(host->mci.hw_dev, "Abort failed at second cmd12!\n");
+ goto out;
+ }
+
+ mci_setup_cmd(&cmd, MMC_CMD_SEND_STATUS, mci->mci->rca << 16,
+ MMC_RSP_R1);
+ ret = dwcmshc_mci_send_cmd(mci, &cmd, NULL);
+ if (ret) {
+ dev_err(host->mci.hw_dev, "Abort failed at second cmd13!\n");
+ goto out;
+ }
+
+ if ((cmd.response[0] & CARD_STATUS_MASK) == CARD_STATUS_TRAN) {
+ goto out; /* All is OK! */
+ } else {
+ dev_err(host->mci.hw_dev,
+ "Abort sequence failed to put card in TRAN state!\n");
+ ret = 1;
+ goto out;
+ }
+
+out:
+ /* Perform SW reset if in abort sequence */
+ sdhci_write8(&host->sdhci, SDHCI_SOFTWARE_RESET,
+ SDHCI_RESET_DATA | SDHCI_RESET_CMD);
+ start = get_time_ns();
+ while (sdhci_read8(&host->sdhci, SDHCI_SOFTWARE_RESET) != 0) {
+ if (is_timeout(start, 50 * MSECOND)) {
+ dev_err(host->mci.hw_dev,
+ "SDHCI data reset timeout\n");
+ break;
+ }
+ }
+ host->in_abort_sequence = 0;
+ return ret;
+}
+
+static int dwcmshc_mci_send_cmd(struct mci_host *mci, struct mci_cmd *cmd,
+ struct mci_data *data)
+{
+ struct dwcmshc_host *host = priv_from_mci_host(mci);
+ dma_addr_t dma = SDHCI_NO_DMA;
+ u32 mask, command, xfer;
+ int ret;
+
+ if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION
+ && host->in_abort_sequence == 0)
+ return do_abort_sequence(mci, cmd);
+
+ /* Do not wait for CMD_INHIBIT_DAT on stop commands */
+ mask = SDHCI_CMD_INHIBIT_CMD;
+ if (cmd->cmdidx != MMC_CMD_STOP_TRANSMISSION)
+ mask |= SDHCI_CMD_INHIBIT_DATA;
+
+ /* Wait for bus idle */
+ ret = wait_on_timeout(50 * MSECOND,
+ !(sdhci_read16(&host->sdhci, SDHCI_PRESENT_STATE) & mask));
+ if (ret) {
+ dev_err(host->mci.hw_dev, "SDHCI timeout while waiting for idle\n");
+ return -ETIMEDOUT;
+ }
+
+ if (data)
+ dev_dbg(host->mci.hw_dev, "cmd %d arg %d bcnt %d bsize %d\n",
+ cmd->cmdidx, cmd->cmdarg, data->blocks, data->blocksize);
+ else
+ dev_dbg(host->mci.hw_dev, "cmd %d arg %d\n", cmd->cmdidx, cmd->cmdarg);
+
+ sdhci_write32(&host->sdhci, SDHCI_INT_STATUS, ~0);
+
+ sdhci_setup_data_dma(&host->sdhci, data, &dma);
+
+ sdhci_write8(&host->sdhci, SDHCI_TIMEOUT_CONTROL, 0xe);
+
+ sdhci_set_cmd_xfer_mode(&host->sdhci, cmd, data,
+ dma == SDHCI_NO_DMA ? false : true,
+ &command, &xfer);
+
+ sdhci_write16(&host->sdhci, SDHCI_TRANSFER_MODE, xfer);
+
+ sdhci_write32(&host->sdhci, SDHCI_ARGUMENT, cmd->cmdarg);
+ sdhci_write16(&host->sdhci, SDHCI_COMMAND, command);
+
+ ret = sdhci_wait_for_done(&host->sdhci, SDHCI_INT_CMD_COMPLETE);
+ if (ret)
+ goto error;
+
+ sdhci_read_response(&host->sdhci, cmd);
+
+ ret = sdhci_transfer_data(&host->sdhci, data, dma);
+error:
+ if (ret) {
+ sdhci_reset(&host->sdhci, SDHCI_RESET_CMD);
+ sdhci_reset(&host->sdhci, SDHCI_RESET_DATA);
+ }
+
+ sdhci_write32(&host->sdhci, SDHCI_INT_STATUS, ~0);
+ return ret;
+}
+
+static u16 dwcmshc_get_clock_divider(struct dwcmshc_host *host, u32 reqclk)
+{
+ u16 div;
+
+ for (div = 1; div < SDHCI_MAX_DIV_SPEC_300; div += 2)
+ if ((host->sdhci.max_clk / div) <= reqclk)
+ break;
+ div /= 2;
+
+ return div;
+}
+
+static void dwcmshc_mci_set_ios(struct mci_host *mci, struct mci_ios *ios)
+{
+ struct dwcmshc_host *host = priv_from_mci_host(mci);
+ u16 val;
+
+ debug("%s: clock = %u, bus-width = %d, timing = %02x\n", __func__,
+ ios->clock, ios->bus_width, ios->timing);
+
+ /* stop clock */
+ sdhci_write16(&host->sdhci, SDHCI_CLOCK_CONTROL, 0);
+
+ if (!ios->clock)
+ return;
+
+ /* enable bus power */
+ val = SDHCI_BUS_VOLTAGE_330;
+ sdhci_write8(&host->sdhci, SDHCI_POWER_CONTROL, val | SDHCI_BUS_POWER_EN);
+ udelay(400);
+
+ /* set bus width */
+ sdhci_set_bus_width(&host->sdhci, ios->bus_width);
+
+ val = sdhci_read8(&host->sdhci, SDHCI_HOST_CONTROL);
+ if (ios->clock > 26000000)
+ val |= SDHCI_CTRL_HISPD;
+ else
+ val &= ~SDHCI_CTRL_HISPD;
+ sdhci_write8(&host->sdhci, SDHCI_HOST_CONTROL, val);
+
+ /* set bus clock */
+ sdhci_write16(&host->sdhci, SDHCI_CLOCK_CONTROL, 0);
+ val = dwcmshc_get_clock_divider(host, ios->clock);
+ val = SDHCI_CLOCK_INT_EN | SDHCI_FREQ_SEL(val) | ((val & 0x300) >> 2);
+ sdhci_write16(&host->sdhci, SDHCI_CLOCK_CONTROL, val);
+
+ /* wait for internal clock stable */
+ if (wait_on_timeout(20 * MSECOND,
+ sdhci_read16(&host->sdhci, SDHCI_CLOCK_CONTROL)
+ & SDHCI_CLOCK_INT_STABLE)) {
+ dev_err(host->mci.hw_dev, "SDHCI clock stable timeout\n");
+ return;
+ }
+
+ /* enable bus clock */
+ sdhci_write16(&host->sdhci, SDHCI_CLOCK_CONTROL, val | SDHCI_CLOCK_CARD_EN);
+}
+
+static int dwcmshc_mci_init(struct mci_host *mci, struct device *dev)
+{
+ struct dwcmshc_host *host = priv_from_mci_host(mci);
+ u16 ctrl2;
+
+ /* reset mshci controller */
+ sdhci_write8(&host->sdhci, SDHCI_SOFTWARE_RESET, SDHCI_RESET_ALL);
+
+ /* wait for reset completion */
+ if (wait_on_timeout(100 * MSECOND,
+ (sdhci_read8(&host->sdhci, SDHCI_SOFTWARE_RESET)
+ & SDHCI_RESET_ALL) == 0)) {
+ dev_err(dev, "SDHCI reset timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ sdhci_write16(&host->sdhci, SDHCI_INT_ERROR_ENABLE, ~0);
+ sdhci_write16(&host->sdhci, SDHCI_INT_ENABLE, ~0);
+ sdhci_write32(&host->sdhci, SDHCI_INT_STATUS, ~0);
+ sdhci_write32(&host->sdhci, SDHCI_SIGNAL_ENABLE, ~0);
+
+ sdhci_enable_v4_mode(&host->sdhci);
+
+ dev_dbg(host->mci.hw_dev, "host version4: %s\n",
+ ctrl2 & SDHCI_CTRL_V4_MODE ? "enabled" : "disabled");
+
+ return 0;
+}
+
+static int dwcmshc_detect(struct device *dev)
+{
+ struct dwcmshc_host *host = dev->priv;
+
+ return mci_detect_card(&host->mci);
+}
+
+static int dwcmshc_mci_card_present(struct mci_host *mci)
+{
+ struct dwcmshc_host *host = priv_from_mci_host(mci);
+ u32 pstate;
+
+ pstate = sdhci_read32(&host->sdhci, SDHCI_PRESENT_STATE);
+ return pstate & SDHCI_CARD_PRESENT;
+}
+
+static void dwcmshc_set_dma_mask(struct device *dev)
+{
+ struct dwcmshc_host *host = dev->priv;
+
+ if (host->sdhci.caps & SDHCI_CAN_64BIT_V4)
+ dma_set_mask(dev, DMA_BIT_MASK(64));
+ else
+ dma_set_mask(dev, DMA_BIT_MASK(32));
+}
+
+static int dwcmshc_probe(struct device *dev)
+{
+ struct dwcmshc_host *host;
+ struct resource *iores;
+ struct mci_host *mci;
+ struct clk *clk;
+ int ret;
+
+ host = xzalloc(sizeof(*host));
+ mci = &host->mci;
+
+ iores = dev_request_mem_resource(dev, 0);
+ if (IS_ERR(iores)) {
+ ret = PTR_ERR(iores);
+ goto err_mem_req;
+ }
+
+ clk = clk_get(dev, NULL);
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
+ goto err_clk_get;
+ }
+ clk_enable(clk);
+
+ host->sdhci.base = IOMEM(iores->start);
+ host->sdhci.mci = mci;
+ host->sdhci.max_clk = clk_get_rate(clk);
+
+ mci->hw_dev = dev;
+ mci->init = dwcmshc_mci_init;
+ mci->set_ios = dwcmshc_mci_set_ios;
+ mci->send_cmd = dwcmshc_mci_send_cmd;
+ mci->card_present = dwcmshc_mci_card_present;
+
+ mci_of_parse(&host->mci);
+
+ /* Enable host_version4 */
+ sdhci_enable_v4_mode(&host->sdhci);
+ sdhci_setup_host(&host->sdhci);
+
+ mci->max_req_size = 0x8000;
+ mci->f_max = clk_get_rate(clk);
+ mci->f_min = mci->f_max / SDHCI_MAX_DIV_SPEC_300;
+
+ dev->priv = host;
+ dev->detect = dwcmshc_detect;
+
+ dwcmshc_set_dma_mask(dev);
+
+ dev_dbg(host->mci.hw_dev, "host controller version: %u\n",
+ host->sdhci.version);
+
+ ret = mci_register(&host->mci);
+ if (ret)
+ goto err_register;
+
+ return ret;
+
+err_register:
+ clk_disable(clk);
+ clk_put(clk);
+err_clk_get:
+ release_region(iores);
+err_mem_req:
+ free(host);
+
+ return ret;
+}
+
+static struct of_device_id dwcmshc_dt_ids[] = {
+ { .compatible = "snps,dwcmshc-sdhci", },
+ { }
+};
+
+static struct driver dwcmshc_driver = {
+ .name = "dwcmshc-sdhci",
+ .probe = dwcmshc_probe,
+ .of_compatible = DRV_OF_COMPAT(dwcmshc_dt_ids),
+};
+device_platform_driver(dwcmshc_driver);
--
2.41.0
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