v4.19.13 snapshot.
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
new file mode 100644
index 0000000..1841d25
--- /dev/null
+++ b/drivers/mmc/host/mmci.c
@@ -0,0 +1,2000 @@
+/*
+ * linux/drivers/mmc/host/mmci.c - ARM PrimeCell MMCI PL180/1 driver
+ *
+ * Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
+ * Copyright (C) 2010 ST-Ericsson SA
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/highmem.h>
+#include <linux/log2.h>
+#include <linux/mmc/pm.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/slot-gpio.h>
+#include <linux/amba/bus.h>
+#include <linux/clk.h>
+#include <linux/scatterlist.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/regulator/consumer.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/amba/mmci.h>
+#include <linux/pm_runtime.h>
+#include <linux/types.h>
+#include <linux/pinctrl/consumer.h>
+
+#include <asm/div64.h>
+#include <asm/io.h>
+
+#include "mmci.h"
+#include "mmci_qcom_dml.h"
+
+#define DRIVER_NAME "mmci-pl18x"
+
+static unsigned int fmax = 515633;
+
+static struct variant_data variant_arm = {
+ .fifosize = 16 * 4,
+ .fifohalfsize = 8 * 4,
+ .datalength_bits = 16,
+ .pwrreg_powerup = MCI_PWR_UP,
+ .f_max = 100000000,
+ .reversed_irq_handling = true,
+ .mmcimask1 = true,
+ .start_err = MCI_STARTBITERR,
+ .opendrain = MCI_ROD,
+};
+
+static struct variant_data variant_arm_extended_fifo = {
+ .fifosize = 128 * 4,
+ .fifohalfsize = 64 * 4,
+ .datalength_bits = 16,
+ .pwrreg_powerup = MCI_PWR_UP,
+ .f_max = 100000000,
+ .mmcimask1 = true,
+ .start_err = MCI_STARTBITERR,
+ .opendrain = MCI_ROD,
+};
+
+static struct variant_data variant_arm_extended_fifo_hwfc = {
+ .fifosize = 128 * 4,
+ .fifohalfsize = 64 * 4,
+ .clkreg_enable = MCI_ARM_HWFCEN,
+ .datalength_bits = 16,
+ .pwrreg_powerup = MCI_PWR_UP,
+ .f_max = 100000000,
+ .mmcimask1 = true,
+ .start_err = MCI_STARTBITERR,
+ .opendrain = MCI_ROD,
+};
+
+static struct variant_data variant_u300 = {
+ .fifosize = 16 * 4,
+ .fifohalfsize = 8 * 4,
+ .clkreg_enable = MCI_ST_U300_HWFCEN,
+ .clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
+ .datalength_bits = 16,
+ .datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
+ .st_sdio = true,
+ .pwrreg_powerup = MCI_PWR_ON,
+ .f_max = 100000000,
+ .signal_direction = true,
+ .pwrreg_clkgate = true,
+ .pwrreg_nopower = true,
+ .mmcimask1 = true,
+ .start_err = MCI_STARTBITERR,
+ .opendrain = MCI_OD,
+};
+
+static struct variant_data variant_nomadik = {
+ .fifosize = 16 * 4,
+ .fifohalfsize = 8 * 4,
+ .clkreg = MCI_CLK_ENABLE,
+ .clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
+ .datalength_bits = 24,
+ .datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
+ .st_sdio = true,
+ .st_clkdiv = true,
+ .pwrreg_powerup = MCI_PWR_ON,
+ .f_max = 100000000,
+ .signal_direction = true,
+ .pwrreg_clkgate = true,
+ .pwrreg_nopower = true,
+ .mmcimask1 = true,
+ .start_err = MCI_STARTBITERR,
+ .opendrain = MCI_OD,
+};
+
+static struct variant_data variant_ux500 = {
+ .fifosize = 30 * 4,
+ .fifohalfsize = 8 * 4,
+ .clkreg = MCI_CLK_ENABLE,
+ .clkreg_enable = MCI_ST_UX500_HWFCEN,
+ .clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
+ .clkreg_neg_edge_enable = MCI_ST_UX500_NEG_EDGE,
+ .datalength_bits = 24,
+ .datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
+ .st_sdio = true,
+ .st_clkdiv = true,
+ .pwrreg_powerup = MCI_PWR_ON,
+ .f_max = 100000000,
+ .signal_direction = true,
+ .pwrreg_clkgate = true,
+ .busy_detect = true,
+ .busy_dpsm_flag = MCI_DPSM_ST_BUSYMODE,
+ .busy_detect_flag = MCI_ST_CARDBUSY,
+ .busy_detect_mask = MCI_ST_BUSYENDMASK,
+ .pwrreg_nopower = true,
+ .mmcimask1 = true,
+ .start_err = MCI_STARTBITERR,
+ .opendrain = MCI_OD,
+};
+
+static struct variant_data variant_ux500v2 = {
+ .fifosize = 30 * 4,
+ .fifohalfsize = 8 * 4,
+ .clkreg = MCI_CLK_ENABLE,
+ .clkreg_enable = MCI_ST_UX500_HWFCEN,
+ .clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
+ .clkreg_neg_edge_enable = MCI_ST_UX500_NEG_EDGE,
+ .datactrl_mask_ddrmode = MCI_DPSM_ST_DDRMODE,
+ .datalength_bits = 24,
+ .datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
+ .st_sdio = true,
+ .st_clkdiv = true,
+ .blksz_datactrl16 = true,
+ .pwrreg_powerup = MCI_PWR_ON,
+ .f_max = 100000000,
+ .signal_direction = true,
+ .pwrreg_clkgate = true,
+ .busy_detect = true,
+ .busy_dpsm_flag = MCI_DPSM_ST_BUSYMODE,
+ .busy_detect_flag = MCI_ST_CARDBUSY,
+ .busy_detect_mask = MCI_ST_BUSYENDMASK,
+ .pwrreg_nopower = true,
+ .mmcimask1 = true,
+ .start_err = MCI_STARTBITERR,
+ .opendrain = MCI_OD,
+};
+
+static struct variant_data variant_stm32 = {
+ .fifosize = 32 * 4,
+ .fifohalfsize = 8 * 4,
+ .clkreg = MCI_CLK_ENABLE,
+ .clkreg_enable = MCI_ST_UX500_HWFCEN,
+ .clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
+ .clkreg_neg_edge_enable = MCI_ST_UX500_NEG_EDGE,
+ .datalength_bits = 24,
+ .datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
+ .st_sdio = true,
+ .st_clkdiv = true,
+ .pwrreg_powerup = MCI_PWR_ON,
+ .f_max = 48000000,
+ .pwrreg_clkgate = true,
+ .pwrreg_nopower = true,
+};
+
+static struct variant_data variant_qcom = {
+ .fifosize = 16 * 4,
+ .fifohalfsize = 8 * 4,
+ .clkreg = MCI_CLK_ENABLE,
+ .clkreg_enable = MCI_QCOM_CLK_FLOWENA |
+ MCI_QCOM_CLK_SELECT_IN_FBCLK,
+ .clkreg_8bit_bus_enable = MCI_QCOM_CLK_WIDEBUS_8,
+ .datactrl_mask_ddrmode = MCI_QCOM_CLK_SELECT_IN_DDR_MODE,
+ .data_cmd_enable = MCI_CPSM_QCOM_DATCMD,
+ .blksz_datactrl4 = true,
+ .datalength_bits = 24,
+ .pwrreg_powerup = MCI_PWR_UP,
+ .f_max = 208000000,
+ .explicit_mclk_control = true,
+ .qcom_fifo = true,
+ .qcom_dml = true,
+ .mmcimask1 = true,
+ .start_err = MCI_STARTBITERR,
+ .opendrain = MCI_ROD,
+ .init = qcom_variant_init,
+};
+
+/* Busy detection for the ST Micro variant */
+static int mmci_card_busy(struct mmc_host *mmc)
+{
+ struct mmci_host *host = mmc_priv(mmc);
+ unsigned long flags;
+ int busy = 0;
+
+ spin_lock_irqsave(&host->lock, flags);
+ if (readl(host->base + MMCISTATUS) & host->variant->busy_detect_flag)
+ busy = 1;
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ return busy;
+}
+
+/*
+ * Validate mmc prerequisites
+ */
+static int mmci_validate_data(struct mmci_host *host,
+ struct mmc_data *data)
+{
+ if (!data)
+ return 0;
+
+ if (!is_power_of_2(data->blksz)) {
+ dev_err(mmc_dev(host->mmc),
+ "unsupported block size (%d bytes)\n", data->blksz);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void mmci_reg_delay(struct mmci_host *host)
+{
+ /*
+ * According to the spec, at least three feedback clock cycles
+ * of max 52 MHz must pass between two writes to the MMCICLOCK reg.
+ * Three MCLK clock cycles must pass between two MMCIPOWER reg writes.
+ * Worst delay time during card init is at 100 kHz => 30 us.
+ * Worst delay time when up and running is at 25 MHz => 120 ns.
+ */
+ if (host->cclk < 25000000)
+ udelay(30);
+ else
+ ndelay(120);
+}
+
+/*
+ * This must be called with host->lock held
+ */
+static void mmci_write_clkreg(struct mmci_host *host, u32 clk)
+{
+ if (host->clk_reg != clk) {
+ host->clk_reg = clk;
+ writel(clk, host->base + MMCICLOCK);
+ }
+}
+
+/*
+ * This must be called with host->lock held
+ */
+static void mmci_write_pwrreg(struct mmci_host *host, u32 pwr)
+{
+ if (host->pwr_reg != pwr) {
+ host->pwr_reg = pwr;
+ writel(pwr, host->base + MMCIPOWER);
+ }
+}
+
+/*
+ * This must be called with host->lock held
+ */
+static void mmci_write_datactrlreg(struct mmci_host *host, u32 datactrl)
+{
+ /* Keep busy mode in DPSM if enabled */
+ datactrl |= host->datactrl_reg & host->variant->busy_dpsm_flag;
+
+ if (host->datactrl_reg != datactrl) {
+ host->datactrl_reg = datactrl;
+ writel(datactrl, host->base + MMCIDATACTRL);
+ }
+}
+
+/*
+ * This must be called with host->lock held
+ */
+static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
+{
+ struct variant_data *variant = host->variant;
+ u32 clk = variant->clkreg;
+
+ /* Make sure cclk reflects the current calculated clock */
+ host->cclk = 0;
+
+ if (desired) {
+ if (variant->explicit_mclk_control) {
+ host->cclk = host->mclk;
+ } else if (desired >= host->mclk) {
+ clk = MCI_CLK_BYPASS;
+ if (variant->st_clkdiv)
+ clk |= MCI_ST_UX500_NEG_EDGE;
+ host->cclk = host->mclk;
+ } else if (variant->st_clkdiv) {
+ /*
+ * DB8500 TRM says f = mclk / (clkdiv + 2)
+ * => clkdiv = (mclk / f) - 2
+ * Round the divider up so we don't exceed the max
+ * frequency
+ */
+ clk = DIV_ROUND_UP(host->mclk, desired) - 2;
+ if (clk >= 256)
+ clk = 255;
+ host->cclk = host->mclk / (clk + 2);
+ } else {
+ /*
+ * PL180 TRM says f = mclk / (2 * (clkdiv + 1))
+ * => clkdiv = mclk / (2 * f) - 1
+ */
+ clk = host->mclk / (2 * desired) - 1;
+ if (clk >= 256)
+ clk = 255;
+ host->cclk = host->mclk / (2 * (clk + 1));
+ }
+
+ clk |= variant->clkreg_enable;
+ clk |= MCI_CLK_ENABLE;
+ /* This hasn't proven to be worthwhile */
+ /* clk |= MCI_CLK_PWRSAVE; */
+ }
+
+ /* Set actual clock for debug */
+ host->mmc->actual_clock = host->cclk;
+
+ if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4)
+ clk |= MCI_4BIT_BUS;
+ if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8)
+ clk |= variant->clkreg_8bit_bus_enable;
+
+ if (host->mmc->ios.timing == MMC_TIMING_UHS_DDR50 ||
+ host->mmc->ios.timing == MMC_TIMING_MMC_DDR52)
+ clk |= variant->clkreg_neg_edge_enable;
+
+ mmci_write_clkreg(host, clk);
+}
+
+static void
+mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
+{
+ writel(0, host->base + MMCICOMMAND);
+
+ BUG_ON(host->data);
+
+ host->mrq = NULL;
+ host->cmd = NULL;
+
+ mmc_request_done(host->mmc, mrq);
+}
+
+static void mmci_set_mask1(struct mmci_host *host, unsigned int mask)
+{
+ void __iomem *base = host->base;
+ struct variant_data *variant = host->variant;
+
+ if (host->singleirq) {
+ unsigned int mask0 = readl(base + MMCIMASK0);
+
+ mask0 &= ~MCI_IRQ1MASK;
+ mask0 |= mask;
+
+ writel(mask0, base + MMCIMASK0);
+ }
+
+ if (variant->mmcimask1)
+ writel(mask, base + MMCIMASK1);
+
+ host->mask1_reg = mask;
+}
+
+static void mmci_stop_data(struct mmci_host *host)
+{
+ mmci_write_datactrlreg(host, 0);
+ mmci_set_mask1(host, 0);
+ host->data = NULL;
+}
+
+static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)
+{
+ unsigned int flags = SG_MITER_ATOMIC;
+
+ if (data->flags & MMC_DATA_READ)
+ flags |= SG_MITER_TO_SG;
+ else
+ flags |= SG_MITER_FROM_SG;
+
+ sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
+}
+
+/*
+ * All the DMA operation mode stuff goes inside this ifdef.
+ * This assumes that you have a generic DMA device interface,
+ * no custom DMA interfaces are supported.
+ */
+#ifdef CONFIG_DMA_ENGINE
+static void mmci_dma_setup(struct mmci_host *host)
+{
+ const char *rxname, *txname;
+
+ host->dma_rx_channel = dma_request_slave_channel(mmc_dev(host->mmc), "rx");
+ host->dma_tx_channel = dma_request_slave_channel(mmc_dev(host->mmc), "tx");
+
+ /* initialize pre request cookie */
+ host->next_data.cookie = 1;
+
+ /*
+ * If only an RX channel is specified, the driver will
+ * attempt to use it bidirectionally, however if it is
+ * is specified but cannot be located, DMA will be disabled.
+ */
+ if (host->dma_rx_channel && !host->dma_tx_channel)
+ host->dma_tx_channel = host->dma_rx_channel;
+
+ if (host->dma_rx_channel)
+ rxname = dma_chan_name(host->dma_rx_channel);
+ else
+ rxname = "none";
+
+ if (host->dma_tx_channel)
+ txname = dma_chan_name(host->dma_tx_channel);
+ else
+ txname = "none";
+
+ dev_info(mmc_dev(host->mmc), "DMA channels RX %s, TX %s\n",
+ rxname, txname);
+
+ /*
+ * Limit the maximum segment size in any SG entry according to
+ * the parameters of the DMA engine device.
+ */
+ if (host->dma_tx_channel) {
+ struct device *dev = host->dma_tx_channel->device->dev;
+ unsigned int max_seg_size = dma_get_max_seg_size(dev);
+
+ if (max_seg_size < host->mmc->max_seg_size)
+ host->mmc->max_seg_size = max_seg_size;
+ }
+ if (host->dma_rx_channel) {
+ struct device *dev = host->dma_rx_channel->device->dev;
+ unsigned int max_seg_size = dma_get_max_seg_size(dev);
+
+ if (max_seg_size < host->mmc->max_seg_size)
+ host->mmc->max_seg_size = max_seg_size;
+ }
+
+ if (host->ops && host->ops->dma_setup)
+ host->ops->dma_setup(host);
+}
+
+/*
+ * This is used in or so inline it
+ * so it can be discarded.
+ */
+static inline void mmci_dma_release(struct mmci_host *host)
+{
+ if (host->dma_rx_channel)
+ dma_release_channel(host->dma_rx_channel);
+ if (host->dma_tx_channel)
+ dma_release_channel(host->dma_tx_channel);
+ host->dma_rx_channel = host->dma_tx_channel = NULL;
+}
+
+static void mmci_dma_data_error(struct mmci_host *host)
+{
+ dev_err(mmc_dev(host->mmc), "error during DMA transfer!\n");
+ dmaengine_terminate_all(host->dma_current);
+ host->dma_in_progress = false;
+ host->dma_current = NULL;
+ host->dma_desc_current = NULL;
+ host->data->host_cookie = 0;
+}
+
+static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
+{
+ struct dma_chan *chan;
+
+ if (data->flags & MMC_DATA_READ)
+ chan = host->dma_rx_channel;
+ else
+ chan = host->dma_tx_channel;
+
+ dma_unmap_sg(chan->device->dev, data->sg, data->sg_len,
+ mmc_get_dma_dir(data));
+}
+
+static void mmci_dma_finalize(struct mmci_host *host, struct mmc_data *data)
+{
+ u32 status;
+ int i;
+
+ /* Wait up to 1ms for the DMA to complete */
+ for (i = 0; ; i++) {
+ status = readl(host->base + MMCISTATUS);
+ if (!(status & MCI_RXDATAAVLBLMASK) || i >= 100)
+ break;
+ udelay(10);
+ }
+
+ /*
+ * Check to see whether we still have some data left in the FIFO -
+ * this catches DMA controllers which are unable to monitor the
+ * DMALBREQ and DMALSREQ signals while allowing us to DMA to non-
+ * contiguous buffers. On TX, we'll get a FIFO underrun error.
+ */
+ if (status & MCI_RXDATAAVLBLMASK) {
+ mmci_dma_data_error(host);
+ if (!data->error)
+ data->error = -EIO;
+ }
+
+ if (!data->host_cookie)
+ mmci_dma_unmap(host, data);
+
+ /*
+ * Use of DMA with scatter-gather is impossible.
+ * Give up with DMA and switch back to PIO mode.
+ */
+ if (status & MCI_RXDATAAVLBLMASK) {
+ dev_err(mmc_dev(host->mmc), "buggy DMA detected. Taking evasive action.\n");
+ mmci_dma_release(host);
+ }
+
+ host->dma_in_progress = false;
+ host->dma_current = NULL;
+ host->dma_desc_current = NULL;
+}
+
+/* prepares DMA channel and DMA descriptor, returns non-zero on failure */
+static int __mmci_dma_prep_data(struct mmci_host *host, struct mmc_data *data,
+ struct dma_chan **dma_chan,
+ struct dma_async_tx_descriptor **dma_desc)
+{
+ struct variant_data *variant = host->variant;
+ struct dma_slave_config conf = {
+ .src_addr = host->phybase + MMCIFIFO,
+ .dst_addr = host->phybase + MMCIFIFO,
+ .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+ .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+ .src_maxburst = variant->fifohalfsize >> 2, /* # of words */
+ .dst_maxburst = variant->fifohalfsize >> 2, /* # of words */
+ .device_fc = false,
+ };
+ struct dma_chan *chan;
+ struct dma_device *device;
+ struct dma_async_tx_descriptor *desc;
+ int nr_sg;
+ unsigned long flags = DMA_CTRL_ACK;
+
+ if (data->flags & MMC_DATA_READ) {
+ conf.direction = DMA_DEV_TO_MEM;
+ chan = host->dma_rx_channel;
+ } else {
+ conf.direction = DMA_MEM_TO_DEV;
+ chan = host->dma_tx_channel;
+ }
+
+ /* If there's no DMA channel, fall back to PIO */
+ if (!chan)
+ return -EINVAL;
+
+ /* If less than or equal to the fifo size, don't bother with DMA */
+ if (data->blksz * data->blocks <= variant->fifosize)
+ return -EINVAL;
+
+ device = chan->device;
+ nr_sg = dma_map_sg(device->dev, data->sg, data->sg_len,
+ mmc_get_dma_dir(data));
+ if (nr_sg == 0)
+ return -EINVAL;
+
+ if (host->variant->qcom_dml)
+ flags |= DMA_PREP_INTERRUPT;
+
+ dmaengine_slave_config(chan, &conf);
+ desc = dmaengine_prep_slave_sg(chan, data->sg, nr_sg,
+ conf.direction, flags);
+ if (!desc)
+ goto unmap_exit;
+
+ *dma_chan = chan;
+ *dma_desc = desc;
+
+ return 0;
+
+ unmap_exit:
+ dma_unmap_sg(device->dev, data->sg, data->sg_len,
+ mmc_get_dma_dir(data));
+ return -ENOMEM;
+}
+
+static inline int mmci_dma_prep_data(struct mmci_host *host,
+ struct mmc_data *data)
+{
+ /* Check if next job is already prepared. */
+ if (host->dma_current && host->dma_desc_current)
+ return 0;
+
+ /* No job were prepared thus do it now. */
+ return __mmci_dma_prep_data(host, data, &host->dma_current,
+ &host->dma_desc_current);
+}
+
+static inline int mmci_dma_prep_next(struct mmci_host *host,
+ struct mmc_data *data)
+{
+ struct mmci_host_next *nd = &host->next_data;
+ return __mmci_dma_prep_data(host, data, &nd->dma_chan, &nd->dma_desc);
+}
+
+static int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
+{
+ int ret;
+ struct mmc_data *data = host->data;
+
+ ret = mmci_dma_prep_data(host, host->data);
+ if (ret)
+ return ret;
+
+ /* Okay, go for it. */
+ dev_vdbg(mmc_dev(host->mmc),
+ "Submit MMCI DMA job, sglen %d blksz %04x blks %04x flags %08x\n",
+ data->sg_len, data->blksz, data->blocks, data->flags);
+ host->dma_in_progress = true;
+ dmaengine_submit(host->dma_desc_current);
+ dma_async_issue_pending(host->dma_current);
+
+ if (host->variant->qcom_dml)
+ dml_start_xfer(host, data);
+
+ datactrl |= MCI_DPSM_DMAENABLE;
+
+ /* Trigger the DMA transfer */
+ mmci_write_datactrlreg(host, datactrl);
+
+ /*
+ * Let the MMCI say when the data is ended and it's time
+ * to fire next DMA request. When that happens, MMCI will
+ * call mmci_data_end()
+ */
+ writel(readl(host->base + MMCIMASK0) | MCI_DATAENDMASK,
+ host->base + MMCIMASK0);
+ return 0;
+}
+
+static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data)
+{
+ struct mmci_host_next *next = &host->next_data;
+
+ WARN_ON(data->host_cookie && data->host_cookie != next->cookie);
+ WARN_ON(!data->host_cookie && (next->dma_desc || next->dma_chan));
+
+ host->dma_desc_current = next->dma_desc;
+ host->dma_current = next->dma_chan;
+ next->dma_desc = NULL;
+ next->dma_chan = NULL;
+}
+
+static void mmci_pre_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct mmci_host *host = mmc_priv(mmc);
+ struct mmc_data *data = mrq->data;
+ struct mmci_host_next *nd = &host->next_data;
+
+ if (!data)
+ return;
+
+ BUG_ON(data->host_cookie);
+
+ if (mmci_validate_data(host, data))
+ return;
+
+ if (!mmci_dma_prep_next(host, data))
+ data->host_cookie = ++nd->cookie < 0 ? 1 : nd->cookie;
+}
+
+static void mmci_post_request(struct mmc_host *mmc, struct mmc_request *mrq,
+ int err)
+{
+ struct mmci_host *host = mmc_priv(mmc);
+ struct mmc_data *data = mrq->data;
+
+ if (!data || !data->host_cookie)
+ return;
+
+ mmci_dma_unmap(host, data);
+
+ if (err) {
+ struct mmci_host_next *next = &host->next_data;
+ struct dma_chan *chan;
+ if (data->flags & MMC_DATA_READ)
+ chan = host->dma_rx_channel;
+ else
+ chan = host->dma_tx_channel;
+ dmaengine_terminate_all(chan);
+
+ if (host->dma_desc_current == next->dma_desc)
+ host->dma_desc_current = NULL;
+
+ if (host->dma_current == next->dma_chan) {
+ host->dma_in_progress = false;
+ host->dma_current = NULL;
+ }
+
+ next->dma_desc = NULL;
+ next->dma_chan = NULL;
+ data->host_cookie = 0;
+ }
+}
+
+#else
+/* Blank functions if the DMA engine is not available */
+static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data)
+{
+}
+static inline void mmci_dma_setup(struct mmci_host *host)
+{
+}
+
+static inline void mmci_dma_release(struct mmci_host *host)
+{
+}
+
+static inline void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
+{
+}
+
+static inline void mmci_dma_finalize(struct mmci_host *host,
+ struct mmc_data *data)
+{
+}
+
+static inline void mmci_dma_data_error(struct mmci_host *host)
+{
+}
+
+static inline int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
+{
+ return -ENOSYS;
+}
+
+#define mmci_pre_request NULL
+#define mmci_post_request NULL
+
+#endif
+
+static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
+{
+ struct variant_data *variant = host->variant;
+ unsigned int datactrl, timeout, irqmask;
+ unsigned long long clks;
+ void __iomem *base;
+ int blksz_bits;
+
+ dev_dbg(mmc_dev(host->mmc), "blksz %04x blks %04x flags %08x\n",
+ data->blksz, data->blocks, data->flags);
+
+ host->data = data;
+ host->size = data->blksz * data->blocks;
+ data->bytes_xfered = 0;
+
+ clks = (unsigned long long)data->timeout_ns * host->cclk;
+ do_div(clks, NSEC_PER_SEC);
+
+ timeout = data->timeout_clks + (unsigned int)clks;
+
+ base = host->base;
+ writel(timeout, base + MMCIDATATIMER);
+ writel(host->size, base + MMCIDATALENGTH);
+
+ blksz_bits = ffs(data->blksz) - 1;
+ BUG_ON(1 << blksz_bits != data->blksz);
+
+ if (variant->blksz_datactrl16)
+ datactrl = MCI_DPSM_ENABLE | (data->blksz << 16);
+ else if (variant->blksz_datactrl4)
+ datactrl = MCI_DPSM_ENABLE | (data->blksz << 4);
+ else
+ datactrl = MCI_DPSM_ENABLE | blksz_bits << 4;
+
+ if (data->flags & MMC_DATA_READ)
+ datactrl |= MCI_DPSM_DIRECTION;
+
+ if (host->mmc->card && mmc_card_sdio(host->mmc->card)) {
+ u32 clk;
+
+ datactrl |= variant->datactrl_mask_sdio;
+
+ /*
+ * The ST Micro variant for SDIO small write transfers
+ * needs to have clock H/W flow control disabled,
+ * otherwise the transfer will not start. The threshold
+ * depends on the rate of MCLK.
+ */
+ if (variant->st_sdio && data->flags & MMC_DATA_WRITE &&
+ (host->size < 8 ||
+ (host->size <= 8 && host->mclk > 50000000)))
+ clk = host->clk_reg & ~variant->clkreg_enable;
+ else
+ clk = host->clk_reg | variant->clkreg_enable;
+
+ mmci_write_clkreg(host, clk);
+ }
+
+ if (host->mmc->ios.timing == MMC_TIMING_UHS_DDR50 ||
+ host->mmc->ios.timing == MMC_TIMING_MMC_DDR52)
+ datactrl |= variant->datactrl_mask_ddrmode;
+
+ /*
+ * Attempt to use DMA operation mode, if this
+ * should fail, fall back to PIO mode
+ */
+ if (!mmci_dma_start_data(host, datactrl))
+ return;
+
+ /* IRQ mode, map the SG list for CPU reading/writing */
+ mmci_init_sg(host, data);
+
+ if (data->flags & MMC_DATA_READ) {
+ irqmask = MCI_RXFIFOHALFFULLMASK;
+
+ /*
+ * If we have less than the fifo 'half-full' threshold to
+ * transfer, trigger a PIO interrupt as soon as any data
+ * is available.
+ */
+ if (host->size < variant->fifohalfsize)
+ irqmask |= MCI_RXDATAAVLBLMASK;
+ } else {
+ /*
+ * We don't actually need to include "FIFO empty" here
+ * since its implicit in "FIFO half empty".
+ */
+ irqmask = MCI_TXFIFOHALFEMPTYMASK;
+ }
+
+ mmci_write_datactrlreg(host, datactrl);
+ writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
+ mmci_set_mask1(host, irqmask);
+}
+
+static void
+mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
+{
+ void __iomem *base = host->base;
+
+ dev_dbg(mmc_dev(host->mmc), "op %02x arg %08x flags %08x\n",
+ cmd->opcode, cmd->arg, cmd->flags);
+
+ if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
+ writel(0, base + MMCICOMMAND);
+ mmci_reg_delay(host);
+ }
+
+ c |= cmd->opcode | MCI_CPSM_ENABLE;
+ if (cmd->flags & MMC_RSP_PRESENT) {
+ if (cmd->flags & MMC_RSP_136)
+ c |= MCI_CPSM_LONGRSP;
+ c |= MCI_CPSM_RESPONSE;
+ }
+ if (/*interrupt*/0)
+ c |= MCI_CPSM_INTERRUPT;
+
+ if (mmc_cmd_type(cmd) == MMC_CMD_ADTC)
+ c |= host->variant->data_cmd_enable;
+
+ host->cmd = cmd;
+
+ writel(cmd->arg, base + MMCIARGUMENT);
+ writel(c, base + MMCICOMMAND);
+}
+
+static void
+mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
+ unsigned int status)
+{
+ /* Make sure we have data to handle */
+ if (!data)
+ return;
+
+ /* First check for errors */
+ if (status & (MCI_DATACRCFAIL | MCI_DATATIMEOUT |
+ host->variant->start_err |
+ MCI_TXUNDERRUN | MCI_RXOVERRUN)) {
+ u32 remain, success;
+
+ /* Terminate the DMA transfer */
+ if (dma_inprogress(host)) {
+ mmci_dma_data_error(host);
+ mmci_dma_unmap(host, data);
+ }
+
+ /*
+ * Calculate how far we are into the transfer. Note that
+ * the data counter gives the number of bytes transferred
+ * on the MMC bus, not on the host side. On reads, this
+ * can be as much as a FIFO-worth of data ahead. This
+ * matters for FIFO overruns only.
+ */
+ remain = readl(host->base + MMCIDATACNT);
+ success = data->blksz * data->blocks - remain;
+
+ dev_dbg(mmc_dev(host->mmc), "MCI ERROR IRQ, status 0x%08x at 0x%08x\n",
+ status, success);
+ if (status & MCI_DATACRCFAIL) {
+ /* Last block was not successful */
+ success -= 1;
+ data->error = -EILSEQ;
+ } else if (status & MCI_DATATIMEOUT) {
+ data->error = -ETIMEDOUT;
+ } else if (status & MCI_STARTBITERR) {
+ data->error = -ECOMM;
+ } else if (status & MCI_TXUNDERRUN) {
+ data->error = -EIO;
+ } else if (status & MCI_RXOVERRUN) {
+ if (success > host->variant->fifosize)
+ success -= host->variant->fifosize;
+ else
+ success = 0;
+ data->error = -EIO;
+ }
+ data->bytes_xfered = round_down(success, data->blksz);
+ }
+
+ if (status & MCI_DATABLOCKEND)
+ dev_err(mmc_dev(host->mmc), "stray MCI_DATABLOCKEND interrupt\n");
+
+ if (status & MCI_DATAEND || data->error) {
+ if (dma_inprogress(host))
+ mmci_dma_finalize(host, data);
+ mmci_stop_data(host);
+
+ if (!data->error)
+ /* The error clause is handled above, success! */
+ data->bytes_xfered = data->blksz * data->blocks;
+
+ if (!data->stop || host->mrq->sbc) {
+ mmci_request_end(host, data->mrq);
+ } else {
+ mmci_start_command(host, data->stop, 0);
+ }
+ }
+}
+
+static void
+mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
+ unsigned int status)
+{
+ void __iomem *base = host->base;
+ bool sbc;
+
+ if (!cmd)
+ return;
+
+ sbc = (cmd == host->mrq->sbc);
+
+ /*
+ * We need to be one of these interrupts to be considered worth
+ * handling. Note that we tag on any latent IRQs postponed
+ * due to waiting for busy status.
+ */
+ if (!((status|host->busy_status) &
+ (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND)))
+ return;
+
+ /*
+ * ST Micro variant: handle busy detection.
+ */
+ if (host->variant->busy_detect) {
+ bool busy_resp = !!(cmd->flags & MMC_RSP_BUSY);
+
+ /* We are busy with a command, return */
+ if (host->busy_status &&
+ (status & host->variant->busy_detect_flag))
+ return;
+
+ /*
+ * We were not busy, but we now got a busy response on
+ * something that was not an error, and we double-check
+ * that the special busy status bit is still set before
+ * proceeding.
+ */
+ if (!host->busy_status && busy_resp &&
+ !(status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT)) &&
+ (readl(base + MMCISTATUS) & host->variant->busy_detect_flag)) {
+
+ /* Clear the busy start IRQ */
+ writel(host->variant->busy_detect_mask,
+ host->base + MMCICLEAR);
+
+ /* Unmask the busy end IRQ */
+ writel(readl(base + MMCIMASK0) |
+ host->variant->busy_detect_mask,
+ base + MMCIMASK0);
+ /*
+ * Now cache the last response status code (until
+ * the busy bit goes low), and return.
+ */
+ host->busy_status =
+ status & (MCI_CMDSENT|MCI_CMDRESPEND);
+ return;
+ }
+
+ /*
+ * At this point we are not busy with a command, we have
+ * not received a new busy request, clear and mask the busy
+ * end IRQ and fall through to process the IRQ.
+ */
+ if (host->busy_status) {
+
+ writel(host->variant->busy_detect_mask,
+ host->base + MMCICLEAR);
+
+ writel(readl(base + MMCIMASK0) &
+ ~host->variant->busy_detect_mask,
+ base + MMCIMASK0);
+ host->busy_status = 0;
+ }
+ }
+
+ host->cmd = NULL;
+
+ if (status & MCI_CMDTIMEOUT) {
+ cmd->error = -ETIMEDOUT;
+ } else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
+ cmd->error = -EILSEQ;
+ } else {
+ cmd->resp[0] = readl(base + MMCIRESPONSE0);
+ cmd->resp[1] = readl(base + MMCIRESPONSE1);
+ cmd->resp[2] = readl(base + MMCIRESPONSE2);
+ cmd->resp[3] = readl(base + MMCIRESPONSE3);
+ }
+
+ if ((!sbc && !cmd->data) || cmd->error) {
+ if (host->data) {
+ /* Terminate the DMA transfer */
+ if (dma_inprogress(host)) {
+ mmci_dma_data_error(host);
+ mmci_dma_unmap(host, host->data);
+ }
+ mmci_stop_data(host);
+ }
+ mmci_request_end(host, host->mrq);
+ } else if (sbc) {
+ mmci_start_command(host, host->mrq->cmd, 0);
+ } else if (!(cmd->data->flags & MMC_DATA_READ)) {
+ mmci_start_data(host, cmd->data);
+ }
+}
+
+static int mmci_get_rx_fifocnt(struct mmci_host *host, u32 status, int remain)
+{
+ return remain - (readl(host->base + MMCIFIFOCNT) << 2);
+}
+
+static int mmci_qcom_get_rx_fifocnt(struct mmci_host *host, u32 status, int r)
+{
+ /*
+ * on qcom SDCC4 only 8 words are used in each burst so only 8 addresses
+ * from the fifo range should be used
+ */
+ if (status & MCI_RXFIFOHALFFULL)
+ return host->variant->fifohalfsize;
+ else if (status & MCI_RXDATAAVLBL)
+ return 4;
+
+ return 0;
+}
+
+static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain)
+{
+ void __iomem *base = host->base;
+ char *ptr = buffer;
+ u32 status = readl(host->base + MMCISTATUS);
+ int host_remain = host->size;
+
+ do {
+ int count = host->get_rx_fifocnt(host, status, host_remain);
+
+ if (count > remain)
+ count = remain;
+
+ if (count <= 0)
+ break;
+
+ /*
+ * SDIO especially may want to send something that is
+ * not divisible by 4 (as opposed to card sectors
+ * etc). Therefore make sure to always read the last bytes
+ * while only doing full 32-bit reads towards the FIFO.
+ */
+ if (unlikely(count & 0x3)) {
+ if (count < 4) {
+ unsigned char buf[4];
+ ioread32_rep(base + MMCIFIFO, buf, 1);
+ memcpy(ptr, buf, count);
+ } else {
+ ioread32_rep(base + MMCIFIFO, ptr, count >> 2);
+ count &= ~0x3;
+ }
+ } else {
+ ioread32_rep(base + MMCIFIFO, ptr, count >> 2);
+ }
+
+ ptr += count;
+ remain -= count;
+ host_remain -= count;
+
+ if (remain == 0)
+ break;
+
+ status = readl(base + MMCISTATUS);
+ } while (status & MCI_RXDATAAVLBL);
+
+ return ptr - buffer;
+}
+
+static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
+{
+ struct variant_data *variant = host->variant;
+ void __iomem *base = host->base;
+ char *ptr = buffer;
+
+ do {
+ unsigned int count, maxcnt;
+
+ maxcnt = status & MCI_TXFIFOEMPTY ?
+ variant->fifosize : variant->fifohalfsize;
+ count = min(remain, maxcnt);
+
+ /*
+ * SDIO especially may want to send something that is
+ * not divisible by 4 (as opposed to card sectors
+ * etc), and the FIFO only accept full 32-bit writes.
+ * So compensate by adding +3 on the count, a single
+ * byte become a 32bit write, 7 bytes will be two
+ * 32bit writes etc.
+ */
+ iowrite32_rep(base + MMCIFIFO, ptr, (count + 3) >> 2);
+
+ ptr += count;
+ remain -= count;
+
+ if (remain == 0)
+ break;
+
+ status = readl(base + MMCISTATUS);
+ } while (status & MCI_TXFIFOHALFEMPTY);
+
+ return ptr - buffer;
+}
+
+/*
+ * PIO data transfer IRQ handler.
+ */
+static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
+{
+ struct mmci_host *host = dev_id;
+ struct sg_mapping_iter *sg_miter = &host->sg_miter;
+ struct variant_data *variant = host->variant;
+ void __iomem *base = host->base;
+ u32 status;
+
+ status = readl(base + MMCISTATUS);
+
+ dev_dbg(mmc_dev(host->mmc), "irq1 (pio) %08x\n", status);
+
+ do {
+ unsigned int remain, len;
+ char *buffer;
+
+ /*
+ * For write, we only need to test the half-empty flag
+ * here - if the FIFO is completely empty, then by
+ * definition it is more than half empty.
+ *
+ * For read, check for data available.
+ */
+ if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
+ break;
+
+ if (!sg_miter_next(sg_miter))
+ break;
+
+ buffer = sg_miter->addr;
+ remain = sg_miter->length;
+
+ len = 0;
+ if (status & MCI_RXACTIVE)
+ len = mmci_pio_read(host, buffer, remain);
+ if (status & MCI_TXACTIVE)
+ len = mmci_pio_write(host, buffer, remain, status);
+
+ sg_miter->consumed = len;
+
+ host->size -= len;
+ remain -= len;
+
+ if (remain)
+ break;
+
+ status = readl(base + MMCISTATUS);
+ } while (1);
+
+ sg_miter_stop(sg_miter);
+
+ /*
+ * If we have less than the fifo 'half-full' threshold to transfer,
+ * trigger a PIO interrupt as soon as any data is available.
+ */
+ if (status & MCI_RXACTIVE && host->size < variant->fifohalfsize)
+ mmci_set_mask1(host, MCI_RXDATAAVLBLMASK);
+
+ /*
+ * If we run out of data, disable the data IRQs; this
+ * prevents a race where the FIFO becomes empty before
+ * the chip itself has disabled the data path, and
+ * stops us racing with our data end IRQ.
+ */
+ if (host->size == 0) {
+ mmci_set_mask1(host, 0);
+ writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
+ }
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * Handle completion of command and data transfers.
+ */
+static irqreturn_t mmci_irq(int irq, void *dev_id)
+{
+ struct mmci_host *host = dev_id;
+ u32 status;
+ int ret = 0;
+
+ spin_lock(&host->lock);
+
+ do {
+ status = readl(host->base + MMCISTATUS);
+
+ if (host->singleirq) {
+ if (status & host->mask1_reg)
+ mmci_pio_irq(irq, dev_id);
+
+ status &= ~MCI_IRQ1MASK;
+ }
+
+ /*
+ * We intentionally clear the MCI_ST_CARDBUSY IRQ (if it's
+ * enabled) in mmci_cmd_irq() function where ST Micro busy
+ * detection variant is handled. Considering the HW seems to be
+ * triggering the IRQ on both edges while monitoring DAT0 for
+ * busy completion and that same status bit is used to monitor
+ * start and end of busy detection, special care must be taken
+ * to make sure that both start and end interrupts are always
+ * cleared one after the other.
+ */
+ status &= readl(host->base + MMCIMASK0);
+ if (host->variant->busy_detect)
+ writel(status & ~host->variant->busy_detect_mask,
+ host->base + MMCICLEAR);
+ else
+ writel(status, host->base + MMCICLEAR);
+
+ dev_dbg(mmc_dev(host->mmc), "irq0 (data+cmd) %08x\n", status);
+
+ if (host->variant->reversed_irq_handling) {
+ mmci_data_irq(host, host->data, status);
+ mmci_cmd_irq(host, host->cmd, status);
+ } else {
+ mmci_cmd_irq(host, host->cmd, status);
+ mmci_data_irq(host, host->data, status);
+ }
+
+ /*
+ * Don't poll for busy completion in irq context.
+ */
+ if (host->variant->busy_detect && host->busy_status)
+ status &= ~host->variant->busy_detect_flag;
+
+ ret = 1;
+ } while (status);
+
+ spin_unlock(&host->lock);
+
+ return IRQ_RETVAL(ret);
+}
+
+static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct mmci_host *host = mmc_priv(mmc);
+ unsigned long flags;
+
+ WARN_ON(host->mrq != NULL);
+
+ mrq->cmd->error = mmci_validate_data(host, mrq->data);
+ if (mrq->cmd->error) {
+ mmc_request_done(mmc, mrq);
+ return;
+ }
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ host->mrq = mrq;
+
+ if (mrq->data)
+ mmci_get_next_data(host, mrq->data);
+
+ if (mrq->data && mrq->data->flags & MMC_DATA_READ)
+ mmci_start_data(host, mrq->data);
+
+ if (mrq->sbc)
+ mmci_start_command(host, mrq->sbc, 0);
+ else
+ mmci_start_command(host, mrq->cmd, 0);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct mmci_host *host = mmc_priv(mmc);
+ struct variant_data *variant = host->variant;
+ u32 pwr = 0;
+ unsigned long flags;
+ int ret;
+
+ if (host->plat->ios_handler &&
+ host->plat->ios_handler(mmc_dev(mmc), ios))
+ dev_err(mmc_dev(mmc), "platform ios_handler failed\n");
+
+ 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);
+
+ /*
+ * The ST Micro variant doesn't have the PL180s MCI_PWR_UP
+ * and instead uses MCI_PWR_ON so apply whatever value is
+ * configured in the variant data.
+ */
+ pwr |= variant->pwrreg_powerup;
+
+ break;
+ case MMC_POWER_ON:
+ if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) {
+ ret = regulator_enable(mmc->supply.vqmmc);
+ if (ret < 0)
+ dev_err(mmc_dev(mmc),
+ "failed to enable vqmmc regulator\n");
+ else
+ host->vqmmc_enabled = true;
+ }
+
+ pwr |= MCI_PWR_ON;
+ break;
+ }
+
+ if (variant->signal_direction && ios->power_mode != MMC_POWER_OFF) {
+ /*
+ * The ST Micro variant has some additional bits
+ * indicating signal direction for the signals in
+ * the SD/MMC bus and feedback-clock usage.
+ */
+ pwr |= host->pwr_reg_add;
+
+ if (ios->bus_width == MMC_BUS_WIDTH_4)
+ pwr &= ~MCI_ST_DATA74DIREN;
+ else if (ios->bus_width == MMC_BUS_WIDTH_1)
+ pwr &= (~MCI_ST_DATA74DIREN &
+ ~MCI_ST_DATA31DIREN &
+ ~MCI_ST_DATA2DIREN);
+ }
+
+ if (variant->opendrain) {
+ if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
+ pwr |= variant->opendrain;
+ } else {
+ /*
+ * If the variant cannot configure the pads by its own, then we
+ * expect the pinctrl to be able to do that for us
+ */
+ if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
+ pinctrl_select_state(host->pinctrl, host->pins_opendrain);
+ else
+ pinctrl_select_state(host->pinctrl, host->pins_default);
+ }
+
+ /*
+ * If clock = 0 and the variant requires the MMCIPOWER to be used for
+ * gating the clock, the MCI_PWR_ON bit is cleared.
+ */
+ if (!ios->clock && variant->pwrreg_clkgate)
+ pwr &= ~MCI_PWR_ON;
+
+ if (host->variant->explicit_mclk_control &&
+ ios->clock != host->clock_cache) {
+ ret = clk_set_rate(host->clk, ios->clock);
+ if (ret < 0)
+ dev_err(mmc_dev(host->mmc),
+ "Error setting clock rate (%d)\n", ret);
+ else
+ host->mclk = clk_get_rate(host->clk);
+ }
+ host->clock_cache = ios->clock;
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ mmci_set_clkreg(host, ios->clock);
+ mmci_write_pwrreg(host, pwr);
+ mmci_reg_delay(host);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static int mmci_get_cd(struct mmc_host *mmc)
+{
+ struct mmci_host *host = mmc_priv(mmc);
+ struct mmci_platform_data *plat = host->plat;
+ unsigned int status = mmc_gpio_get_cd(mmc);
+
+ if (status == -ENOSYS) {
+ if (!plat->status)
+ return 1; /* Assume always present */
+
+ status = plat->status(mmc_dev(host->mmc));
+ }
+ return status;
+}
+
+static int mmci_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ int ret = 0;
+
+ if (!IS_ERR(mmc->supply.vqmmc)) {
+
+ switch (ios->signal_voltage) {
+ case MMC_SIGNAL_VOLTAGE_330:
+ ret = regulator_set_voltage(mmc->supply.vqmmc,
+ 2700000, 3600000);
+ break;
+ case MMC_SIGNAL_VOLTAGE_180:
+ ret = regulator_set_voltage(mmc->supply.vqmmc,
+ 1700000, 1950000);
+ break;
+ case MMC_SIGNAL_VOLTAGE_120:
+ ret = regulator_set_voltage(mmc->supply.vqmmc,
+ 1100000, 1300000);
+ break;
+ }
+
+ if (ret)
+ dev_warn(mmc_dev(mmc), "Voltage switch failed\n");
+ }
+
+ return ret;
+}
+
+static struct mmc_host_ops mmci_ops = {
+ .request = mmci_request,
+ .pre_req = mmci_pre_request,
+ .post_req = mmci_post_request,
+ .set_ios = mmci_set_ios,
+ .get_ro = mmc_gpio_get_ro,
+ .get_cd = mmci_get_cd,
+ .start_signal_voltage_switch = mmci_sig_volt_switch,
+};
+
+static int mmci_of_parse(struct device_node *np, struct mmc_host *mmc)
+{
+ struct mmci_host *host = mmc_priv(mmc);
+ int ret = mmc_of_parse(mmc);
+
+ if (ret)
+ return ret;
+
+ if (of_get_property(np, "st,sig-dir-dat0", NULL))
+ host->pwr_reg_add |= MCI_ST_DATA0DIREN;
+ if (of_get_property(np, "st,sig-dir-dat2", NULL))
+ host->pwr_reg_add |= MCI_ST_DATA2DIREN;
+ if (of_get_property(np, "st,sig-dir-dat31", NULL))
+ host->pwr_reg_add |= MCI_ST_DATA31DIREN;
+ if (of_get_property(np, "st,sig-dir-dat74", NULL))
+ host->pwr_reg_add |= MCI_ST_DATA74DIREN;
+ if (of_get_property(np, "st,sig-dir-cmd", NULL))
+ host->pwr_reg_add |= MCI_ST_CMDDIREN;
+ if (of_get_property(np, "st,sig-pin-fbclk", NULL))
+ host->pwr_reg_add |= MCI_ST_FBCLKEN;
+
+ if (of_get_property(np, "mmc-cap-mmc-highspeed", NULL))
+ mmc->caps |= MMC_CAP_MMC_HIGHSPEED;
+ if (of_get_property(np, "mmc-cap-sd-highspeed", NULL))
+ mmc->caps |= MMC_CAP_SD_HIGHSPEED;
+
+ return 0;
+}
+
+static int mmci_probe(struct amba_device *dev,
+ const struct amba_id *id)
+{
+ struct mmci_platform_data *plat = dev->dev.platform_data;
+ struct device_node *np = dev->dev.of_node;
+ struct variant_data *variant = id->data;
+ struct mmci_host *host;
+ struct mmc_host *mmc;
+ int ret;
+
+ /* Must have platform data or Device Tree. */
+ if (!plat && !np) {
+ dev_err(&dev->dev, "No plat data or DT found\n");
+ return -EINVAL;
+ }
+
+ if (!plat) {
+ plat = devm_kzalloc(&dev->dev, sizeof(*plat), GFP_KERNEL);
+ if (!plat)
+ return -ENOMEM;
+ }
+
+ mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
+ if (!mmc)
+ return -ENOMEM;
+
+ ret = mmci_of_parse(np, mmc);
+ if (ret)
+ goto host_free;
+
+ host = mmc_priv(mmc);
+ host->mmc = mmc;
+
+ /*
+ * Some variant (STM32) doesn't have opendrain bit, nevertheless
+ * pins can be set accordingly using pinctrl
+ */
+ if (!variant->opendrain) {
+ host->pinctrl = devm_pinctrl_get(&dev->dev);
+ if (IS_ERR(host->pinctrl)) {
+ dev_err(&dev->dev, "failed to get pinctrl");
+ ret = PTR_ERR(host->pinctrl);
+ goto host_free;
+ }
+
+ host->pins_default = pinctrl_lookup_state(host->pinctrl,
+ PINCTRL_STATE_DEFAULT);
+ if (IS_ERR(host->pins_default)) {
+ dev_err(mmc_dev(mmc), "Can't select default pins\n");
+ ret = PTR_ERR(host->pins_default);
+ goto host_free;
+ }
+
+ host->pins_opendrain = pinctrl_lookup_state(host->pinctrl,
+ MMCI_PINCTRL_STATE_OPENDRAIN);
+ if (IS_ERR(host->pins_opendrain)) {
+ dev_err(mmc_dev(mmc), "Can't select opendrain pins\n");
+ ret = PTR_ERR(host->pins_opendrain);
+ goto host_free;
+ }
+ }
+
+ host->hw_designer = amba_manf(dev);
+ host->hw_revision = amba_rev(dev);
+ dev_dbg(mmc_dev(mmc), "designer ID = 0x%02x\n", host->hw_designer);
+ dev_dbg(mmc_dev(mmc), "revision = 0x%01x\n", host->hw_revision);
+
+ host->clk = devm_clk_get(&dev->dev, NULL);
+ if (IS_ERR(host->clk)) {
+ ret = PTR_ERR(host->clk);
+ goto host_free;
+ }
+
+ ret = clk_prepare_enable(host->clk);
+ if (ret)
+ goto host_free;
+
+ if (variant->qcom_fifo)
+ host->get_rx_fifocnt = mmci_qcom_get_rx_fifocnt;
+ else
+ host->get_rx_fifocnt = mmci_get_rx_fifocnt;
+
+ host->plat = plat;
+ host->variant = variant;
+ host->mclk = clk_get_rate(host->clk);
+ /*
+ * According to the spec, mclk is max 100 MHz,
+ * so we try to adjust the clock down to this,
+ * (if possible).
+ */
+ if (host->mclk > variant->f_max) {
+ ret = clk_set_rate(host->clk, variant->f_max);
+ if (ret < 0)
+ goto clk_disable;
+ host->mclk = clk_get_rate(host->clk);
+ dev_dbg(mmc_dev(mmc), "eventual mclk rate: %u Hz\n",
+ host->mclk);
+ }
+
+ host->phybase = dev->res.start;
+ host->base = devm_ioremap_resource(&dev->dev, &dev->res);
+ if (IS_ERR(host->base)) {
+ ret = PTR_ERR(host->base);
+ goto clk_disable;
+ }
+
+ if (variant->init)
+ variant->init(host);
+
+ /*
+ * The ARM and ST versions of the block have slightly different
+ * clock divider equations which means that the minimum divider
+ * differs too.
+ * on Qualcomm like controllers get the nearest minimum clock to 100Khz
+ */
+ if (variant->st_clkdiv)
+ mmc->f_min = DIV_ROUND_UP(host->mclk, 257);
+ else if (variant->explicit_mclk_control)
+ mmc->f_min = clk_round_rate(host->clk, 100000);
+ else
+ mmc->f_min = DIV_ROUND_UP(host->mclk, 512);
+ /*
+ * If no maximum operating frequency is supplied, fall back to use
+ * the module parameter, which has a (low) default value in case it
+ * is not specified. Either value must not exceed the clock rate into
+ * the block, of course.
+ */
+ if (mmc->f_max)
+ mmc->f_max = variant->explicit_mclk_control ?
+ min(variant->f_max, mmc->f_max) :
+ min(host->mclk, mmc->f_max);
+ else
+ mmc->f_max = variant->explicit_mclk_control ?
+ fmax : min(host->mclk, fmax);
+
+
+ dev_dbg(mmc_dev(mmc), "clocking block at %u Hz\n", mmc->f_max);
+
+ /* Get regulators and the supported OCR mask */
+ ret = mmc_regulator_get_supply(mmc);
+ if (ret)
+ goto clk_disable;
+
+ if (!mmc->ocr_avail)
+ mmc->ocr_avail = plat->ocr_mask;
+ else if (plat->ocr_mask)
+ dev_warn(mmc_dev(mmc), "Platform OCR mask is ignored\n");
+
+ /* DT takes precedence over platform data. */
+ if (!np) {
+ if (!plat->cd_invert)
+ mmc->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
+ mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
+ }
+
+ /* We support these capabilities. */
+ mmc->caps |= MMC_CAP_CMD23;
+
+ /*
+ * Enable busy detection.
+ */
+ if (variant->busy_detect) {
+ mmci_ops.card_busy = mmci_card_busy;
+ /*
+ * Not all variants have a flag to enable busy detection
+ * in the DPSM, but if they do, set it here.
+ */
+ if (variant->busy_dpsm_flag)
+ mmci_write_datactrlreg(host,
+ host->variant->busy_dpsm_flag);
+ mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
+ mmc->max_busy_timeout = 0;
+ }
+
+ mmc->ops = &mmci_ops;
+
+ /* We support these PM capabilities. */
+ mmc->pm_caps |= MMC_PM_KEEP_POWER;
+
+ /*
+ * We can do SGIO
+ */
+ mmc->max_segs = NR_SG;
+
+ /*
+ * Since only a certain number of bits are valid in the data length
+ * register, we must ensure that we don't exceed 2^num-1 bytes in a
+ * single request.
+ */
+ mmc->max_req_size = (1 << variant->datalength_bits) - 1;
+
+ /*
+ * Set the maximum segment size. Since we aren't doing DMA
+ * (yet) we are only limited by the data length register.
+ */
+ mmc->max_seg_size = mmc->max_req_size;
+
+ /*
+ * Block size can be up to 2048 bytes, but must be a power of two.
+ */
+ mmc->max_blk_size = 1 << 11;
+
+ /*
+ * Limit the number of blocks transferred so that we don't overflow
+ * the maximum request size.
+ */
+ mmc->max_blk_count = mmc->max_req_size >> 11;
+
+ spin_lock_init(&host->lock);
+
+ writel(0, host->base + MMCIMASK0);
+
+ if (variant->mmcimask1)
+ writel(0, host->base + MMCIMASK1);
+
+ writel(0xfff, host->base + MMCICLEAR);
+
+ /*
+ * If:
+ * - not using DT but using a descriptor table, or
+ * - using a table of descriptors ALONGSIDE DT, or
+ * look up these descriptors named "cd" and "wp" right here, fail
+ * silently of these do not exist and proceed to try platform data
+ */
+ if (!np) {
+ ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
+ if (ret < 0) {
+ if (ret == -EPROBE_DEFER)
+ goto clk_disable;
+ else if (gpio_is_valid(plat->gpio_cd)) {
+ ret = mmc_gpio_request_cd(mmc, plat->gpio_cd, 0);
+ if (ret)
+ goto clk_disable;
+ }
+ }
+
+ ret = mmc_gpiod_request_ro(mmc, "wp", 0, false, 0, NULL);
+ if (ret < 0) {
+ if (ret == -EPROBE_DEFER)
+ goto clk_disable;
+ else if (gpio_is_valid(plat->gpio_wp)) {
+ ret = mmc_gpio_request_ro(mmc, plat->gpio_wp);
+ if (ret)
+ goto clk_disable;
+ }
+ }
+ }
+
+ ret = devm_request_irq(&dev->dev, dev->irq[0], mmci_irq, IRQF_SHARED,
+ DRIVER_NAME " (cmd)", host);
+ if (ret)
+ goto clk_disable;
+
+ if (!dev->irq[1])
+ host->singleirq = true;
+ else {
+ ret = devm_request_irq(&dev->dev, dev->irq[1], mmci_pio_irq,
+ IRQF_SHARED, DRIVER_NAME " (pio)", host);
+ if (ret)
+ goto clk_disable;
+ }
+
+ writel(MCI_IRQENABLE, host->base + MMCIMASK0);
+
+ amba_set_drvdata(dev, mmc);
+
+ dev_info(&dev->dev, "%s: PL%03x manf %x rev%u at 0x%08llx irq %d,%d (pio)\n",
+ mmc_hostname(mmc), amba_part(dev), amba_manf(dev),
+ amba_rev(dev), (unsigned long long)dev->res.start,
+ dev->irq[0], dev->irq[1]);
+
+ mmci_dma_setup(host);
+
+ pm_runtime_set_autosuspend_delay(&dev->dev, 50);
+ pm_runtime_use_autosuspend(&dev->dev);
+
+ mmc_add_host(mmc);
+
+ pm_runtime_put(&dev->dev);
+ return 0;
+
+ clk_disable:
+ clk_disable_unprepare(host->clk);
+ host_free:
+ mmc_free_host(mmc);
+ return ret;
+}
+
+static int mmci_remove(struct amba_device *dev)
+{
+ struct mmc_host *mmc = amba_get_drvdata(dev);
+
+ if (mmc) {
+ struct mmci_host *host = mmc_priv(mmc);
+ struct variant_data *variant = host->variant;
+
+ /*
+ * Undo pm_runtime_put() in probe. We use the _sync
+ * version here so that we can access the primecell.
+ */
+ pm_runtime_get_sync(&dev->dev);
+
+ mmc_remove_host(mmc);
+
+ writel(0, host->base + MMCIMASK0);
+
+ if (variant->mmcimask1)
+ writel(0, host->base + MMCIMASK1);
+
+ writel(0, host->base + MMCICOMMAND);
+ writel(0, host->base + MMCIDATACTRL);
+
+ mmci_dma_release(host);
+ clk_disable_unprepare(host->clk);
+ mmc_free_host(mmc);
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static void mmci_save(struct mmci_host *host)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ writel(0, host->base + MMCIMASK0);
+ if (host->variant->pwrreg_nopower) {
+ writel(0, host->base + MMCIDATACTRL);
+ writel(0, host->base + MMCIPOWER);
+ writel(0, host->base + MMCICLOCK);
+ }
+ mmci_reg_delay(host);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static void mmci_restore(struct mmci_host *host)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ if (host->variant->pwrreg_nopower) {
+ writel(host->clk_reg, host->base + MMCICLOCK);
+ writel(host->datactrl_reg, host->base + MMCIDATACTRL);
+ writel(host->pwr_reg, host->base + MMCIPOWER);
+ }
+ writel(MCI_IRQENABLE, host->base + MMCIMASK0);
+ mmci_reg_delay(host);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static int mmci_runtime_suspend(struct device *dev)
+{
+ struct amba_device *adev = to_amba_device(dev);
+ struct mmc_host *mmc = amba_get_drvdata(adev);
+
+ if (mmc) {
+ struct mmci_host *host = mmc_priv(mmc);
+ pinctrl_pm_select_sleep_state(dev);
+ mmci_save(host);
+ clk_disable_unprepare(host->clk);
+ }
+
+ return 0;
+}
+
+static int mmci_runtime_resume(struct device *dev)
+{
+ struct amba_device *adev = to_amba_device(dev);
+ struct mmc_host *mmc = amba_get_drvdata(adev);
+
+ if (mmc) {
+ struct mmci_host *host = mmc_priv(mmc);
+ clk_prepare_enable(host->clk);
+ mmci_restore(host);
+ pinctrl_pm_select_default_state(dev);
+ }
+
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops mmci_dev_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+ SET_RUNTIME_PM_OPS(mmci_runtime_suspend, mmci_runtime_resume, NULL)
+};
+
+static const struct amba_id mmci_ids[] = {
+ {
+ .id = 0x00041180,
+ .mask = 0xff0fffff,
+ .data = &variant_arm,
+ },
+ {
+ .id = 0x01041180,
+ .mask = 0xff0fffff,
+ .data = &variant_arm_extended_fifo,
+ },
+ {
+ .id = 0x02041180,
+ .mask = 0xff0fffff,
+ .data = &variant_arm_extended_fifo_hwfc,
+ },
+ {
+ .id = 0x00041181,
+ .mask = 0x000fffff,
+ .data = &variant_arm,
+ },
+ /* ST Micro variants */
+ {
+ .id = 0x00180180,
+ .mask = 0x00ffffff,
+ .data = &variant_u300,
+ },
+ {
+ .id = 0x10180180,
+ .mask = 0xf0ffffff,
+ .data = &variant_nomadik,
+ },
+ {
+ .id = 0x00280180,
+ .mask = 0x00ffffff,
+ .data = &variant_nomadik,
+ },
+ {
+ .id = 0x00480180,
+ .mask = 0xf0ffffff,
+ .data = &variant_ux500,
+ },
+ {
+ .id = 0x10480180,
+ .mask = 0xf0ffffff,
+ .data = &variant_ux500v2,
+ },
+ {
+ .id = 0x00880180,
+ .mask = 0x00ffffff,
+ .data = &variant_stm32,
+ },
+ /* Qualcomm variants */
+ {
+ .id = 0x00051180,
+ .mask = 0x000fffff,
+ .data = &variant_qcom,
+ },
+ { 0, 0 },
+};
+
+MODULE_DEVICE_TABLE(amba, mmci_ids);
+
+static struct amba_driver mmci_driver = {
+ .drv = {
+ .name = DRIVER_NAME,
+ .pm = &mmci_dev_pm_ops,
+ },
+ .probe = mmci_probe,
+ .remove = mmci_remove,
+ .id_table = mmci_ids,
+};
+
+module_amba_driver(mmci_driver);
+
+module_param(fmax, uint, 0444);
+
+MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
+MODULE_LICENSE("GPL");