This adds support for a Rockchip derivation of the DWCMSHC controller which itself is a SDHCI controller found on some Rockchip SoCs like the RK3568. Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> Link: https://lore.barebox.org/20210607104411.23071-13-s.hauer@xxxxxxxxxxxxxx Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> --- drivers/mci/Kconfig | 7 + drivers/mci/Makefile | 1 + drivers/mci/rockchip-dwcmshc-sdhci.c | 377 +++++++++++++++++++++++++++ 3 files changed, 385 insertions(+) create mode 100644 drivers/mci/rockchip-dwcmshc-sdhci.c diff --git a/drivers/mci/Kconfig b/drivers/mci/Kconfig index 7d4e72138d..e1fcd41271 100644 --- a/drivers/mci/Kconfig +++ b/drivers/mci/Kconfig @@ -79,6 +79,13 @@ config MCI_MXS Enable this entry to add support to read and write SD cards on a i.MX23/i.MX28 based system. +config MCI_ROCKCHIP_DWCMSHC + bool "MCI sdhc support for Rockchip SoCs" + select MCI_SDHCI + help + Enable this entry to add support for a Rockchip derivation of the + DWCMSHC controller found on some Rockchip SoCs like the RK3568. + config MCI_S3C bool "S3C" depends on ARCH_S3C24xx diff --git a/drivers/mci/Makefile b/drivers/mci/Makefile index 60dc100c37..b113b1c732 100644 --- a/drivers/mci/Makefile +++ b/drivers/mci/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_MCI_MXS) += mxs.o obj-$(CONFIG_MCI_OMAP_HSMMC) += omap_hsmmc.o obj-$(CONFIG_MCI_PXA) += pxamci.o obj-$(CONFIG_MCI_S3C) += s3c.o +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 diff --git a/drivers/mci/rockchip-dwcmshc-sdhci.c b/drivers/mci/rockchip-dwcmshc-sdhci.c new file mode 100644 index 0000000000..164f662552 --- /dev/null +++ b/drivers/mci/rockchip-dwcmshc-sdhci.c @@ -0,0 +1,377 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <clock.h> +#include <common.h> +#include <driver.h> +#include <init.h> +#include <linux/clk.h> +#include <mci.h> +#include <dma.h> +#include <linux/iopoll.h> + +#include "sdhci.h" + +/* DWCMSHC specific Mode Select value */ +#define DWCMSHC_CTRL_HS400 0x7 + +#define DWCMSHC_VER_ID 0x500 +#define DWCMSHC_VER_TYPE 0x504 +#define DWCMSHC_HOST_CTRL3 0x508 +#define DWCMSHC_EMMC_CONTROL 0x52c +#define DWCMSHC_EMMC_ATCTRL 0x540 + +/* Rockchip specific Registers */ +#define DWCMSHC_EMMC_DLL_CTRL 0x800 +#define DWCMSHC_EMMC_DLL_RXCLK 0x804 +#define DWCMSHC_EMMC_DLL_TXCLK 0x808 +#define DWCMSHC_EMMC_DLL_STRBIN 0x80c +#define DWCMSHC_EMMC_DLL_STATUS0 0x840 +#define DWCMSHC_EMMC_DLL_START BIT(0) +#define DWCMSHC_EMMC_DLL_RXCLK_SRCSEL 29 +#define DWCMSHC_EMMC_DLL_START_POINT 16 +#define DWCMSHC_EMMC_DLL_INC 8 +#define DWCMSHC_EMMC_DLL_DLYENA BIT(27) +#define DLL_TXCLK_TAPNUM_DEFAULT 0x8 +#define DLL_STRBIN_TAPNUM_DEFAULT 0x8 +#define DLL_TXCLK_TAPNUM_FROM_SW BIT(24) +#define DLL_STRBIN_TAPNUM_FROM_SW BIT(24) +#define DWCMSHC_EMMC_DLL_LOCKED BIT(8) +#define DWCMSHC_EMMC_DLL_TIMEOUT BIT(9) +#define DLL_RXCLK_NO_INVERTER 1 +#define DLL_RXCLK_INVERTER 0 +#define DWCMSHC_ENHANCED_STROBE BIT(8) +#define DLL_LOCK_WO_TMOUT(x) \ + ((((x) & DWCMSHC_EMMC_DLL_LOCKED) == DWCMSHC_EMMC_DLL_LOCKED) && \ + (((x) & DWCMSHC_EMMC_DLL_TIMEOUT) == 0)) + +#define SDHCI_DWCMSHC_INT_DATA_MASK SDHCI_INT_XFER_COMPLETE | \ + SDHCI_INT_DMA | \ + SDHCI_INT_SPACE_AVAIL | \ + SDHCI_INT_DATA_AVAIL | \ + SDHCI_INT_DATA_TIMEOUT | \ + SDHCI_INT_DATA_CRC | \ + SDHCI_INT_DATA_END_BIT + +#define SDHCI_DWCMSHC_INT_CMD_MASK SDHCI_INT_CMD_COMPLETE | \ + SDHCI_INT_TIMEOUT | \ + SDHCI_INT_CRC | \ + SDHCI_INT_END_BIT | \ + SDHCI_INT_INDEX + +enum { + CLK_CORE, + CLK_BUS, + CLK_AXI, + CLK_BLOCK, + CLK_TIMER, + CLK_MAX, +}; + +struct rk_sdhci_host { + struct mci_host mci; + struct sdhci sdhci; + struct clk_bulk_data clks[CLK_MAX]; +}; + + +static inline +struct rk_sdhci_host *to_rk_sdhci_host(struct mci_host *mci) +{ + return container_of(mci, struct rk_sdhci_host, mci); +} + +static int rk_sdhci_card_present(struct mci_host *mci) +{ + struct rk_sdhci_host *host = to_rk_sdhci_host(mci); + + return !!(sdhci_read32(&host->sdhci, SDHCI_PRESENT_STATE) & SDHCI_CARD_DETECT); +} + +static int rk_sdhci_reset(struct rk_sdhci_host *host, u8 mask) +{ + sdhci_write8(&host->sdhci, SDHCI_SOFTWARE_RESET, mask); + + /* wait for reset completion */ + if (wait_on_timeout(100 * MSECOND, + !(sdhci_read8(&host->sdhci, SDHCI_SOFTWARE_RESET) & mask))){ + dev_err(host->mci.hw_dev, "SDHCI reset timeout\n"); + return -ETIMEDOUT; + } + + return 0; +} + +static int rk_sdhci_init(struct mci_host *mci, struct device_d *dev) +{ + struct rk_sdhci_host *host = to_rk_sdhci_host(mci); + int ret; + + ret = rk_sdhci_reset(host, SDHCI_RESET_ALL); + if (ret) + return ret; + + sdhci_write8(&host->sdhci, SDHCI_POWER_CONTROL, + SDHCI_BUS_VOLTAGE_330 | SDHCI_BUS_POWER_EN); + udelay(400); + + sdhci_write32(&host->sdhci, SDHCI_INT_ENABLE, + SDHCI_DWCMSHC_INT_DATA_MASK | + SDHCI_DWCMSHC_INT_CMD_MASK); + sdhci_write32(&host->sdhci, SDHCI_SIGNAL_ENABLE, 0x00); + + /* Disable cmd conflict check */ + sdhci_write32(&host->sdhci, DWCMSHC_HOST_CTRL3, 0x0); + /* Reset previous settings */ + sdhci_write32(&host->sdhci, DWCMSHC_EMMC_DLL_TXCLK, 0); + sdhci_write32(&host->sdhci, DWCMSHC_EMMC_DLL_STRBIN, 0); + + return 0; +} + +static void rk_sdhci_set_clock(struct rk_sdhci_host *host, unsigned int clock) +{ + u32 txclk_tapnum = DLL_TXCLK_TAPNUM_DEFAULT, extra; + int err; + + host->mci.clock = 0; + + /* DO NOT TOUCH THIS SETTING */ + extra = DWCMSHC_EMMC_DLL_DLYENA | + DLL_RXCLK_NO_INVERTER << DWCMSHC_EMMC_DLL_RXCLK_SRCSEL; + sdhci_write32(&host->sdhci, DWCMSHC_EMMC_DLL_RXCLK, extra); + + if (clock == 0) + return; + + /* Rockchip platform only support 375KHz for identify mode */ + if (clock <= 400000) + clock = 375000; + + clk_set_rate(host->clks[CLK_CORE].clk, clock); + + sdhci_set_clock(&host->sdhci, clock, clk_get_rate(host->clks[CLK_CORE].clk)); + + if (clock <= 400000) + return; + + /* Reset DLL */ + sdhci_write32(&host->sdhci, DWCMSHC_EMMC_DLL_CTRL, BIT(1)); + udelay(1); + sdhci_write32(&host->sdhci, DWCMSHC_EMMC_DLL_CTRL, 0x0); + + /* Init DLL settings */ + extra = 0x5 << DWCMSHC_EMMC_DLL_START_POINT | + 0x2 << DWCMSHC_EMMC_DLL_INC | + DWCMSHC_EMMC_DLL_START; + sdhci_write32(&host->sdhci, DWCMSHC_EMMC_DLL_CTRL, extra); + err = readl_poll_timeout(host->sdhci.base + DWCMSHC_EMMC_DLL_STATUS0, + extra, DLL_LOCK_WO_TMOUT(extra), + 500 * USEC_PER_MSEC); + if (err) { + dev_err(host->mci.hw_dev, "DLL lock timeout!\n"); + return; + } + + /* Disable cmd conflict check */ + extra = sdhci_read32(&host->sdhci, DWCMSHC_HOST_CTRL3); + extra &= ~BIT(0); + sdhci_write32(&host->sdhci, DWCMSHC_HOST_CTRL3, extra); + + extra = 0x1 << 16 | /* tune clock stop en */ + 0x2 << 17 | /* pre-change delay */ + 0x3 << 19; /* post-change delay */ + sdhci_write32(&host->sdhci, DWCMSHC_EMMC_ATCTRL, extra); + + extra = DWCMSHC_EMMC_DLL_DLYENA | + DLL_TXCLK_TAPNUM_FROM_SW | + txclk_tapnum; + sdhci_write32(&host->sdhci, DWCMSHC_EMMC_DLL_TXCLK, extra); + + extra = DWCMSHC_EMMC_DLL_DLYENA | + DLL_STRBIN_TAPNUM_DEFAULT | + DLL_STRBIN_TAPNUM_FROM_SW; + sdhci_write32(&host->sdhci, DWCMSHC_EMMC_DLL_STRBIN, extra); +} + +static void rk_sdhci_set_ios(struct mci_host *mci, struct mci_ios *ios) +{ + struct rk_sdhci_host *host = to_rk_sdhci_host(mci); + u16 val; + + /* stop clock */ + sdhci_write16(&host->sdhci, SDHCI_CLOCK_CONTROL, 0); + + if (ios->clock) + rk_sdhci_set_clock(host, ios->clock); + + 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); +} + +static int rk_sdhci_wait_for_done(struct rk_sdhci_host *host, u32 mask) +{ + u64 start = get_time_ns(); + u16 stat; + + do { + stat = sdhci_read16(&host->sdhci, SDHCI_INT_NORMAL_STATUS); + if (stat & SDHCI_INT_ERROR) { + dev_err(host->mci.hw_dev, "SDHCI_INT_ERROR: 0x%08x\n", + sdhci_read16(&host->sdhci, SDHCI_INT_ERROR_STATUS)); + return -EPERM; + } + + if (is_timeout(start, 1000 * MSECOND)) { + dev_err(host->mci.hw_dev, + "SDHCI timeout while waiting for done\n"); + return -ETIMEDOUT; + } + } while ((stat & mask) != mask); + + return 0; +} + +static void print_error(struct rk_sdhci_host *host, int cmdidx) +{ + dev_err(host->mci.hw_dev, + "error while transfering data for command %d\n", cmdidx); + dev_err(host->mci.hw_dev, "state = 0x%08x , interrupt = 0x%08x\n", + sdhci_read32(&host->sdhci, SDHCI_PRESENT_STATE), + sdhci_read32(&host->sdhci, SDHCI_INT_NORMAL_STATUS)); +} + +static int rk_sdhci_send_cmd(struct mci_host *mci, struct mci_cmd *cmd, + struct mci_data *data) +{ + struct rk_sdhci_host *host = to_rk_sdhci_host(mci); + u32 mask, command, xfer; + int ret; + dma_addr_t dma; + + /* Wait for idle before next command */ + mask = SDHCI_CMD_INHIBIT_CMD; + if (cmd->cmdidx != MMC_CMD_STOP_TRANSMISSION) + mask |= SDHCI_CMD_INHIBIT_DATA; + + ret = wait_on_timeout(10 * MSECOND, + !(sdhci_read32(&host->sdhci, SDHCI_PRESENT_STATE) & mask)); + + if (ret) { + dev_err(host->mci.hw_dev, + "SDHCI timeout while waiting for idle\n"); + return ret; + } + + sdhci_write32(&host->sdhci, SDHCI_INT_STATUS, ~0); + + sdhci_write8(&host->sdhci, SDHCI_TIMEOUT_CONTROL, 0xe); + + sdhci_setup_data_dma(&host->sdhci, data, &dma); + + 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 = rk_sdhci_wait_for_done(host, SDHCI_INT_CMD_COMPLETE); + if (ret == -EPERM) + goto error; + else if (ret) + return ret; + + sdhci_read_response(&host->sdhci, cmd); + sdhci_write32(&host->sdhci, SDHCI_INT_STATUS, SDHCI_INT_CMD_COMPLETE); + + ret = sdhci_transfer_data_dma(&host->sdhci, data, dma); + +error: + if (ret) { + print_error(host, cmd->cmdidx); + rk_sdhci_reset(host, BIT(1)); /* SDHCI_RESET_CMD */ + rk_sdhci_reset(host, BIT(2)); /* SDHCI_RESET_DATA */ + } + + sdhci_write32(&host->sdhci, SDHCI_INT_STATUS, ~0); + return ret; +} + +static int rk_sdhci_probe(struct device_d *dev) +{ + struct rk_sdhci_host *host; + struct resource *iores; + struct mci_host *mci; + int ret; + + host = xzalloc(sizeof(*host)); + + mci = &host->mci; + + iores = dev_request_mem_resource(dev, 0); + if (IS_ERR(iores)) + return PTR_ERR(iores); + + host->sdhci.base = IOMEM(iores->start); + host->sdhci.mci = mci; + mci->send_cmd = rk_sdhci_send_cmd; + mci->set_ios = rk_sdhci_set_ios; + mci->init = rk_sdhci_init; + mci->card_present = rk_sdhci_card_present; + mci->hw_dev = dev; + + host->clks[CLK_CORE].id = "core"; + host->clks[CLK_BUS].id = "bus"; + host->clks[CLK_AXI].id = "axi"; + host->clks[CLK_BLOCK].id = "block"; + host->clks[CLK_TIMER].id = "timer"; + + ret = clk_bulk_get(host->mci.hw_dev, CLK_MAX, host->clks); + if (ret) { + dev_err(host->mci.hw_dev, "failed to get clocks: %s\n", + strerror(-ret)); + return ret; + } + + ret = clk_bulk_enable(CLK_MAX, host->clks); + if (ret) { + dev_err(host->mci.hw_dev, "failed to enable clocks: %s\n", + strerror(-ret)); + return ret; + } + + host->sdhci.max_clk = clk_get_rate(host->clks[CLK_CORE].clk); + + mci_of_parse(&host->mci); + + sdhci_setup_host(&host->sdhci); + + dev->priv = host; + + return mci_register(&host->mci); +} + +static __maybe_unused struct of_device_id rk_sdhci_compatible[] = { + { + .compatible = "rockchip,rk3568-dwcmshc" + }, { + /* sentinel */ + } +}; + +static struct driver_d rk_sdhci_driver = { + .name = "rk3568-dwcmshc-sdhci", + .probe = rk_sdhci_probe, + .of_compatible = DRV_OF_COMPAT(rk_sdhci_compatible), +}; +device_platform_driver(rk_sdhci_driver); -- 2.29.2 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
