[PATCH v6 2/2] mmc: add new Alcor Micro Cardreader SD/MMC driver
From: Oleksij Rempel
Date: Sun Dec 02 2018 - 05:31:28 EST
This driver provides support for Alcor Micro AU6601 and AU6621
SD/MMC controller.
Signed-off-by: Oleksij Rempel <linux@xxxxxxxxxxxxxxxx>
---
drivers/mmc/host/Kconfig | 7 +
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/alcor.c | 1165 +++++++++++++++++++++++++++++++++++++
3 files changed, 1173 insertions(+)
create mode 100644 drivers/mmc/host/alcor.c
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 1b58739d9744..e64e5a59387f 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -441,6 +441,13 @@ config MMC_WBSD
If unsure, say N.
+config MMC_ALCOR
+ tristate "Alcor Micro/Alcor Link SD/MMC controller"
+ depends on MISC_ALCOR_PCI
+ help
+ Say Y here to include driver code to support SD/MMC card interface
+ of Alcor Micro PCI-E card reader
+
config MMC_AU1X
tristate "Alchemy AU1XX0 MMC Card Interface support"
depends on MIPS_ALCHEMY
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 720d37777098..0a38e654a2ce 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_MMC_SDHCI_F_SDH30) += sdhci_f_sdh30.o
obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o
obj-$(CONFIG_MMC_WBSD) += wbsd.o
obj-$(CONFIG_MMC_AU1X) += au1xmmc.o
+obj-$(CONFIG_MMC_ALCOR) += alcor.o
obj-$(CONFIG_MMC_MTK) += mtk-sd.o
obj-$(CONFIG_MMC_OMAP) += omap.o
obj-$(CONFIG_MMC_OMAP_HS) += omap_hsmmc.o
diff --git a/drivers/mmc/host/alcor.c b/drivers/mmc/host/alcor.c
new file mode 100644
index 000000000000..f729a649d7c0
--- /dev/null
+++ b/drivers/mmc/host/alcor.c
@@ -0,0 +1,1165 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Oleksij Rempel <linux@xxxxxxxxxxxxxxxx>
+ *
+ * Driver for Alcor Micro AU6601 and AU6621 controllers
+ */
+
+/* Note: this driver was created without any documentation. Based
+ * on sniffing, testing and in some cases mimic of original driver.
+ * As soon as some one with documentation or more experience in SD/MMC, or
+ * reverse engineering then me, please review this driver and question every
+ * thing what I did. 2018 Oleksij Rempel <linux@xxxxxxxxxxxxxxxx>
+ */
+
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/pm.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+
+#include <linux/alcor_pci.h>
+
+enum alcor_cookie {
+ COOKIE_UNMAPPED,
+ COOKIE_PRE_MAPPED,
+ COOKIE_MAPPED,
+};
+
+struct alcor_pll_conf {
+ unsigned int clk_src_freq;
+ unsigned int clk_src_reg;
+ unsigned int min_div;
+ unsigned int max_div;
+};
+
+struct alcor_sdmmc_host {
+ struct device *dev;
+ struct alcor_pci_priv *alcor_pci;
+
+ struct mmc_host *mmc;
+ struct mmc_request *mrq;
+ struct mmc_command *cmd;
+ struct mmc_data *data;
+ unsigned int dma_on:1;
+ unsigned int early_data:1;
+
+ struct mutex cmd_mutex;
+
+ struct delayed_work timeout_work;
+
+ struct sg_mapping_iter sg_miter; /* SG state for PIO */
+ struct scatterlist *sg;
+ unsigned int blocks; /* remaining PIO blocks */
+ int sg_count;
+
+ u32 irq_status_sd;
+ unsigned char cur_power_mode;
+};
+
+static const struct alcor_pll_conf alcor_pll_cfg[] = {
+ /* MHZ, CLK src, max div, min div */
+ { 31250000, AU6601_CLK_31_25_MHZ, 1, 511},
+ { 48000000, AU6601_CLK_48_MHZ, 1, 511},
+ {125000000, AU6601_CLK_125_MHZ, 1, 511},
+ {384000000, AU6601_CLK_384_MHZ, 1, 511},
+};
+
+static inline void alcor_rmw8(struct alcor_sdmmc_host *host, unsigned int addr,
+ u8 clear, u8 set)
+{
+ struct alcor_pci_priv *priv = host->alcor_pci;
+ u32 var;
+
+ var = alcor_read8(priv, addr);
+ var &= ~clear;
+ var |= set;
+ alcor_write8(priv, var, addr);
+}
+
+/* As soon as irqs are masked, some status updates may be missed.
+ * Use this with care.
+ */
+static inline void alcor_mask_sd_irqs(struct alcor_sdmmc_host *host)
+{
+ struct alcor_pci_priv *priv = host->alcor_pci;
+
+ alcor_write32(priv, 0, AU6601_REG_INT_ENABLE);
+}
+
+static inline void alcor_unmask_sd_irqs(struct alcor_sdmmc_host *host)
+{
+ struct alcor_pci_priv *priv = host->alcor_pci;
+
+ alcor_write32(priv, AU6601_INT_CMD_MASK | AU6601_INT_DATA_MASK |
+ AU6601_INT_CARD_INSERT | AU6601_INT_CARD_REMOVE |
+ AU6601_INT_OVER_CURRENT_ERR,
+ AU6601_REG_INT_ENABLE);
+}
+
+static void alcor_reset(struct alcor_sdmmc_host *host, u8 val)
+{
+ struct alcor_pci_priv *priv = host->alcor_pci;
+ int i;
+
+ alcor_write8(priv, val | AU6601_BUF_CTRL_RESET,
+ AU6601_REG_SW_RESET);
+ for (i = 0; i < 100; i++) {
+ if (!(alcor_read8(priv, AU6601_REG_SW_RESET) & val))
+ return;
+ udelay(50);
+ }
+ dev_err(host->dev, "%s: timeout\n", __func__);
+}
+
+static void alcor_data_set_dma(struct alcor_sdmmc_host *host)
+{
+ struct alcor_pci_priv *priv = host->alcor_pci;
+ u32 addr, len;
+
+ if (!host->sg_count)
+ return;
+
+ if (!host->sg) {
+ dev_err(host->dev, "have blocks, but no SG\n");
+ return;
+ }
+
+ if (!sg_dma_len(host->sg)) {
+ dev_err(host->dev, "DMA SG len == 0\n");
+ return;
+ }
+
+
+ addr = (u32)sg_dma_address(host->sg);
+ len = sg_dma_len(host->sg);
+
+ alcor_write32(priv, addr, AU6601_REG_SDMA_ADDR);
+ host->sg = sg_next(host->sg);
+ host->sg_count--;
+}
+
+static void alcor_trigger_data_transfer(struct alcor_sdmmc_host *host,
+ bool early)
+{
+ struct alcor_pci_priv *priv = host->alcor_pci;
+ struct mmc_data *data = host->data;
+ u8 ctrl = 0;
+
+ if (data->flags & MMC_DATA_WRITE)
+ ctrl |= AU6601_DATA_WRITE;
+
+ if (data->host_cookie == COOKIE_MAPPED) {
+ if (host->early_data) {
+ host->early_data = false;
+ return;
+ }
+
+ host->early_data = early;
+
+ alcor_data_set_dma(host);
+ ctrl |= AU6601_DATA_DMA_MODE;
+ host->dma_on = 1;
+ alcor_write32(priv, data->sg_count * 0x1000,
+ AU6601_REG_BLOCK_SIZE);
+ } else {
+ alcor_write32(priv, data->blksz, AU6601_REG_BLOCK_SIZE);
+ }
+
+ alcor_write8(priv, ctrl | AU6601_DATA_START_XFER,
+ AU6601_DATA_XFER_CTRL);
+}
+
+static void alcor_trf_block_pio(struct alcor_sdmmc_host *host, bool read)
+{
+ struct alcor_pci_priv *priv = host->alcor_pci;
+ size_t blksize, len;
+ u8 *buf;
+
+ if (!host->blocks)
+ return;
+
+ if (host->dma_on) {
+ dev_err(host->dev, "configured DMA but got PIO request.\n");
+ return;
+ }
+
+ if (!!(host->data->flags & MMC_DATA_READ) != read) {
+ dev_err(host->dev, "got unexpected direction %i != %i\n",
+ !!(host->data->flags & MMC_DATA_READ), read);
+ }
+
+ if (!sg_miter_next(&host->sg_miter))
+ return;
+
+ blksize = host->data->blksz;
+ len = min(host->sg_miter.length, blksize);
+
+ dev_dbg(host->dev, "PIO, %s block size: 0x%zx\n",
+ read ? "read" : "write", blksize);
+
+ host->sg_miter.consumed = len;
+ host->blocks--;
+
+ buf = host->sg_miter.addr;
+
+ if (read)
+ ioread32_rep(priv->iobase + AU6601_REG_BUFFER, buf, len >> 2);
+ else
+ iowrite32_rep(priv->iobase + AU6601_REG_BUFFER, buf, len >> 2);
+
+ sg_miter_stop(&host->sg_miter);
+}
+
+static void alcor_prepare_sg_miter(struct alcor_sdmmc_host *host)
+{
+ unsigned int flags = SG_MITER_ATOMIC;
+ struct mmc_data *data = host->data;
+
+ 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);
+}
+
+static void alcor_prepare_data(struct alcor_sdmmc_host *host,
+ struct mmc_command *cmd)
+{
+ struct mmc_data *data = cmd->data;
+
+ if (!data)
+ return;
+
+
+ host->data = data;
+ host->data->bytes_xfered = 0;
+ host->blocks = data->blocks;
+ host->sg = data->sg;
+ host->sg_count = data->sg_count;
+ dev_dbg(host->dev, "prepare DATA: sg %i, blocks: %i\n",
+ host->sg_count, host->blocks);
+
+ if (data->host_cookie != COOKIE_MAPPED)
+ alcor_prepare_sg_miter(host);
+
+ alcor_trigger_data_transfer(host, true);
+}
+
+static void alcor_send_cmd(struct alcor_sdmmc_host *host,
+ struct mmc_command *cmd, bool set_timeout)
+{
+ struct alcor_pci_priv *priv = host->alcor_pci;
+ unsigned long timeout = 0;
+ u8 ctrl = 0;
+
+ host->cmd = cmd;
+ alcor_prepare_data(host, cmd);
+
+ dev_dbg(host->dev, "send CMD. opcode: 0x%02x, arg; 0x%08x\n",
+ cmd->opcode, cmd->arg);
+ alcor_write8(priv, cmd->opcode | 0x40, AU6601_REG_CMD_OPCODE);
+ alcor_write32be(priv, cmd->arg, AU6601_REG_CMD_ARG);
+
+ switch (mmc_resp_type(cmd)) {
+ case MMC_RSP_NONE:
+ ctrl = AU6601_CMD_NO_RESP;
+ break;
+ case MMC_RSP_R1:
+ ctrl = AU6601_CMD_6_BYTE_CRC;
+ break;
+ case MMC_RSP_R1B:
+ ctrl = AU6601_CMD_6_BYTE_CRC | AU6601_CMD_STOP_WAIT_RDY;
+ break;
+ case MMC_RSP_R2:
+ ctrl = AU6601_CMD_17_BYTE_CRC;
+ break;
+ case MMC_RSP_R3:
+ ctrl = AU6601_CMD_6_BYTE_WO_CRC;
+ break;
+ default:
+ dev_err(host->dev, "%s: cmd->flag (0x%02x) is not valid\n",
+ mmc_hostname(host->mmc), mmc_resp_type(cmd));
+ break;
+ }
+
+ if (set_timeout) {
+ if (!cmd->data && cmd->busy_timeout)
+ timeout = cmd->busy_timeout;
+ else
+ timeout = 10000;
+
+ schedule_delayed_work(&host->timeout_work,
+ msecs_to_jiffies(timeout));
+ }
+
+ dev_dbg(host->dev, "xfer ctrl: 0x%02x; timeout: %lu\n", ctrl, timeout);
+ alcor_write8(priv, ctrl | AU6601_CMD_START_XFER,
+ AU6601_CMD_XFER_CTRL);
+}
+
+static void alcor_request_complete(struct alcor_sdmmc_host *host,
+ bool cancel_timeout)
+{
+ struct mmc_request *mrq;
+
+ /*
+ * If this work gets rescheduled while running, it will
+ * be run again afterwards but without any active request.
+ */
+ if (!host->mrq)
+ return;
+
+ if (cancel_timeout)
+ cancel_delayed_work(&host->timeout_work);
+
+ mrq = host->mrq;
+
+ host->mrq = NULL;
+ host->cmd = NULL;
+ host->data = NULL;
+ host->dma_on = 0;
+
+ mmc_request_done(host->mmc, mrq);
+}
+
+static void alcor_finish_data(struct alcor_sdmmc_host *host)
+{
+ struct mmc_data *data;
+
+ data = host->data;
+ host->data = NULL;
+ host->dma_on = 0;
+
+ /*
+ * The specification states that the block count register must
+ * be updated, but it does not specify at what point in the
+ * data flow. That makes the register entirely useless to read
+ * back so we have to assume that nothing made it to the card
+ * in the event of an error.
+ */
+ if (data->error)
+ data->bytes_xfered = 0;
+ else
+ data->bytes_xfered = data->blksz * data->blocks;
+
+ /*
+ * Need to send CMD12 if -
+ * a) open-ended multiblock transfer (no CMD23)
+ * b) error in multiblock transfer
+ */
+ if (data->stop &&
+ (data->error ||
+ !host->mrq->sbc)) {
+
+ /*
+ * The controller needs a reset of internal state machines
+ * upon error conditions.
+ */
+ if (data->error)
+ alcor_reset(host, AU6601_RESET_CMD | AU6601_RESET_DATA);
+
+ alcor_unmask_sd_irqs(host);
+ alcor_send_cmd(host, data->stop, false);
+ return;
+ }
+
+ alcor_request_complete(host, 1);
+}
+
+static void alcor_err_irq(struct alcor_sdmmc_host *host, u32 intmask)
+{
+ dev_dbg(host->dev, "ERR IRQ %x\n", intmask);
+
+ if (host->cmd) {
+ if (intmask & AU6601_INT_CMD_TIMEOUT_ERR)
+ host->cmd->error = -ETIMEDOUT;
+ else
+ host->cmd->error = -EILSEQ;
+ }
+
+ if (host->data) {
+ if (intmask & AU6601_INT_DATA_TIMEOUT_ERR)
+ host->data->error = -ETIMEDOUT;
+ else
+ host->data->error = -EILSEQ;
+
+ host->data->bytes_xfered = 0;
+ }
+
+ alcor_reset(host, AU6601_RESET_CMD | AU6601_RESET_DATA);
+ alcor_request_complete(host, 1);
+}
+
+static int alcor_cmd_irq_done(struct alcor_sdmmc_host *host, u32 intmask)
+{
+ struct alcor_pci_priv *priv = host->alcor_pci;
+
+ intmask &= AU6601_INT_CMD_END;
+
+ if (!intmask)
+ return true;
+
+ /* got CMD_END but no CMD is in progress, wake thread an process the
+ * error
+ */
+ if (!host->cmd)
+ return false;
+
+ if (host->cmd->flags & MMC_RSP_PRESENT) {
+ struct mmc_command *cmd = host->cmd;
+
+ cmd->resp[0] = alcor_read32be(priv, AU6601_REG_CMD_RSP0);
+ dev_dbg(host->dev, "RSP0: 0x%04x\n", cmd->resp[0]);
+ if (host->cmd->flags & MMC_RSP_136) {
+ cmd->resp[1] =
+ alcor_read32be(priv, AU6601_REG_CMD_RSP1);
+ cmd->resp[2] =
+ alcor_read32be(priv, AU6601_REG_CMD_RSP2);
+ cmd->resp[3] =
+ alcor_read32be(priv, AU6601_REG_CMD_RSP3);
+ dev_dbg(host->dev, "RSP1,2,3: 0x%04x 0x%04x 0x%04x\n",
+ cmd->resp[1], cmd->resp[2], cmd->resp[3]);
+ }
+
+ }
+
+ host->cmd->error = 0;
+
+ /* Processed actual command. */
+ if (!host->data)
+ return false;
+
+ alcor_trigger_data_transfer(host, false);
+ host->cmd = NULL;
+ return true;
+}
+
+static void alcor_cmd_irq_thread(struct alcor_sdmmc_host *host, u32 intmask)
+{
+ intmask &= AU6601_INT_CMD_END;
+
+ if (!intmask)
+ return;
+
+ if (!host->cmd && intmask & AU6601_INT_CMD_END) {
+ dev_dbg(host->dev, "Got command interrupt 0x%08x even though no command operation was in progress.\n",
+ intmask);
+ }
+
+ /* Processed actual command. */
+ if (!host->data)
+ alcor_request_complete(host, 1);
+ else
+ alcor_trigger_data_transfer(host, false);
+ host->cmd = NULL;
+}
+
+static int alcor_data_irq_done(struct alcor_sdmmc_host *host, u32 intmask)
+{
+ u32 tmp;
+
+ intmask &= AU6601_INT_DATA_MASK;
+
+ /* nothing here to do */
+ if (!intmask)
+ return 1;
+
+ /* we was too fast and got DATA_END after it was processed?
+ * lets ignore it for now.
+ */
+ if (!host->data && intmask == AU6601_INT_DATA_END)
+ return 1;
+
+ /* looks like an error, so lets handle it. */
+ if (!host->data)
+ return 0;
+
+ tmp = intmask & (AU6601_INT_READ_BUF_RDY | AU6601_INT_WRITE_BUF_RDY
+ | AU6601_INT_DMA_END);
+ switch (tmp) {
+ case 0:
+ break;
+ case AU6601_INT_READ_BUF_RDY:
+ alcor_trf_block_pio(host, true);
+ if (!host->blocks)
+ break;
+ alcor_trigger_data_transfer(host, false);
+ return 1;
+ case AU6601_INT_WRITE_BUF_RDY:
+ alcor_trf_block_pio(host, false);
+ if (!host->blocks)
+ break;
+ alcor_trigger_data_transfer(host, false);
+ return 1;
+ case AU6601_INT_DMA_END:
+ if (!host->sg_count)
+ break;
+
+ alcor_data_set_dma(host);
+ break;
+ default:
+ dev_err(host->dev, "Got READ_BUF_RDY and WRITE_BUF_RDY at same time\n");
+ break;
+ }
+
+ if (intmask & AU6601_INT_DATA_END)
+ return 0;
+
+ return 1;
+}
+
+static void alcor_data_irq_thread(struct alcor_sdmmc_host *host, u32 intmask)
+{
+ intmask &= AU6601_INT_DATA_MASK;
+
+ if (!intmask)
+ return;
+
+ if (!host->data) {
+ dev_dbg(host->dev, "Got data interrupt 0x%08x even though no data operation was in progress.\n",
+ intmask);
+ alcor_reset(host, AU6601_RESET_DATA);
+ return;
+ }
+
+ if (alcor_data_irq_done(host, intmask))
+ return;
+
+ if ((intmask & AU6601_INT_DATA_END) || !host->blocks ||
+ (host->dma_on && !host->sg_count))
+ alcor_finish_data(host);
+}
+
+static void alcor_cd_irq(struct alcor_sdmmc_host *host, u32 intmask)
+{
+ dev_dbg(host->dev, "card %s\n",
+ intmask & AU6601_INT_CARD_REMOVE ? "removed" : "inserted");
+
+ if (host->mrq) {
+ dev_dbg(host->dev, "cancel all pending tasks.\n");
+
+ if (host->data)
+ host->data->error = -ENOMEDIUM;
+
+ if (host->cmd)
+ host->cmd->error = -ENOMEDIUM;
+ else
+ host->mrq->cmd->error = -ENOMEDIUM;
+
+ alcor_request_complete(host, 1);
+ }
+
+ mmc_detect_change(host->mmc, msecs_to_jiffies(1));
+}
+
+static irqreturn_t alcor_irq_thread(int irq, void *d)
+{
+ struct alcor_sdmmc_host *host = d;
+ irqreturn_t ret = IRQ_HANDLED;
+ u32 intmask, tmp;
+
+ mutex_lock(&host->cmd_mutex);
+
+ intmask = host->irq_status_sd;
+
+ /* some thing bad */
+ if (unlikely(!intmask || AU6601_INT_ALL_MASK == intmask)) {
+ dev_dbg(host->dev, "unexpected IRQ: 0x%04x\n", intmask);
+ ret = IRQ_NONE;
+ goto exit;
+ }
+
+ tmp = intmask & (AU6601_INT_CMD_MASK | AU6601_INT_DATA_MASK);
+ if (tmp) {
+ if (tmp & AU6601_INT_ERROR_MASK)
+ alcor_err_irq(host, tmp);
+ else {
+ alcor_cmd_irq_thread(host, tmp);
+ alcor_data_irq_thread(host, tmp);
+ }
+ intmask &= ~(AU6601_INT_CMD_MASK | AU6601_INT_DATA_MASK);
+ }
+
+ if (intmask & (AU6601_INT_CARD_INSERT | AU6601_INT_CARD_REMOVE)) {
+ alcor_cd_irq(host, intmask);
+ intmask &= ~(AU6601_INT_CARD_INSERT | AU6601_INT_CARD_REMOVE);
+ }
+
+ if (intmask & AU6601_INT_OVER_CURRENT_ERR) {
+ dev_warn(host->dev,
+ "warning: over current detected!\n");
+ intmask &= ~AU6601_INT_OVER_CURRENT_ERR;
+ }
+
+ if (intmask)
+ dev_dbg(host->dev, "got not handled IRQ: 0x%04x\n", intmask);
+
+exit:
+ mutex_unlock(&host->cmd_mutex);
+ alcor_unmask_sd_irqs(host);
+ return ret;
+}
+
+
+static irqreturn_t alcor_irq(int irq, void *d)
+{
+ struct alcor_sdmmc_host *host = d;
+ struct alcor_pci_priv *priv = host->alcor_pci;
+ u32 status, tmp;
+ irqreturn_t ret;
+ int cmd_done, data_done;
+
+ status = alcor_read32(priv, AU6601_REG_INT_STATUS);
+ if (!status)
+ return IRQ_NONE;
+
+ alcor_write32(priv, status, AU6601_REG_INT_STATUS);
+
+ tmp = status & (AU6601_INT_READ_BUF_RDY | AU6601_INT_WRITE_BUF_RDY
+ | AU6601_INT_DATA_END | AU6601_INT_DMA_END
+ | AU6601_INT_CMD_END);
+ if (tmp == status) {
+ cmd_done = alcor_cmd_irq_done(host, tmp);
+ data_done = alcor_data_irq_done(host, tmp);
+ /* use fast path for simple tasks */
+ if (cmd_done && data_done) {
+ ret = IRQ_HANDLED;
+ goto alcor_irq_done;
+ }
+ }
+
+ host->irq_status_sd = status;
+ ret = IRQ_WAKE_THREAD;
+ alcor_mask_sd_irqs(host);
+alcor_irq_done:
+ return ret;
+}
+
+static void alcor_set_clock(struct alcor_sdmmc_host *host, unsigned int clock)
+{
+ struct alcor_pci_priv *priv = host->alcor_pci;
+ unsigned int clock_out = 0;
+ int i, diff = 0x7fffffff, tmp_clock = 0;
+ u16 clk_src = 0;
+ u8 clk_div = 0;
+
+ if (clock == 0) {
+ alcor_write16(priv, 0, AU6601_CLK_SELECT);
+ return;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(alcor_pll_cfg); i++) {
+ unsigned int tmp_div, tmp_diff;
+ const struct alcor_pll_conf *cfg = &alcor_pll_cfg[i];
+
+ tmp_div = DIV_ROUND_UP(cfg->clk_src_freq, clock);
+ if (cfg->min_div > tmp_div || tmp_div > cfg->max_div)
+ continue;
+
+ tmp_clock = DIV_ROUND_UP(cfg->clk_src_freq, tmp_div);
+ tmp_diff = abs(clock - tmp_clock);
+
+ if (tmp_diff >= 0 && tmp_diff < diff) {
+ diff = tmp_diff;
+ clk_src = cfg->clk_src_reg;
+ clk_div = tmp_div;
+ clock_out = tmp_clock;
+ }
+ }
+
+ clk_src |= ((clk_div - 1) << 8);
+ clk_src |= AU6601_CLK_ENABLE;
+
+ dev_dbg(host->dev, "set freq %d cal freq %d, use div %d, mod %x\n",
+ clock, tmp_clock, clk_div, clk_src);
+
+ alcor_write16(priv, clk_src, AU6601_CLK_SELECT);
+
+}
+
+static void alcor_set_timing(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct alcor_sdmmc_host *host = mmc_priv(mmc);
+
+ if (ios->timing == MMC_TIMING_LEGACY) {
+ alcor_rmw8(host, AU6601_CLK_DELAY,
+ AU6601_CLK_POSITIVE_EDGE_ALL, 0);
+ } else {
+ alcor_rmw8(host, AU6601_CLK_DELAY,
+ 0, AU6601_CLK_POSITIVE_EDGE_ALL);
+ }
+}
+
+static void alcor_set_bus_width(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct alcor_sdmmc_host *host = mmc_priv(mmc);
+ struct alcor_pci_priv *priv = host->alcor_pci;
+
+ if (ios->bus_width == MMC_BUS_WIDTH_1) {
+ alcor_write8(priv, 0, AU6601_REG_BUS_CTRL);
+ } else if (ios->bus_width == MMC_BUS_WIDTH_4) {
+ alcor_write8(priv, AU6601_BUS_WIDTH_4BIT,
+ AU6601_REG_BUS_CTRL);
+ } else
+ dev_err(host->dev, "Unknown BUS mode\n");
+
+}
+
+static int alcor_card_busy(struct mmc_host *mmc)
+{
+ struct alcor_sdmmc_host *host = mmc_priv(mmc);
+ struct alcor_pci_priv *priv = host->alcor_pci;
+ u8 status;
+
+ /* Check whether dat[0:3] low */
+ status = alcor_read8(priv, AU6601_DATA_PIN_STATE);
+
+ return !(status & AU6601_BUS_STAT_DAT_MASK);
+}
+
+static int alcor_get_cd(struct mmc_host *mmc)
+{
+ struct alcor_sdmmc_host *host = mmc_priv(mmc);
+ struct alcor_pci_priv *priv = host->alcor_pci;
+ u8 detect;
+
+ detect = alcor_read8(priv, AU6601_DETECT_STATUS)
+ & AU6601_DETECT_STATUS_M;
+ /* check if card is present then send command and data */
+ return (detect == AU6601_SD_DETECTED);
+}
+
+static int alcor_get_ro(struct mmc_host *mmc)
+{
+ struct alcor_sdmmc_host *host = mmc_priv(mmc);
+ struct alcor_pci_priv *priv = host->alcor_pci;
+ u8 status;
+
+ /* get write protect pin status */
+ status = alcor_read8(priv, AU6601_INTERFACE_MODE_CTRL);
+
+ return !!(status & AU6601_SD_CARD_WP);
+}
+
+static void alcor_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct alcor_sdmmc_host *host = mmc_priv(mmc);
+
+ mutex_lock(&host->cmd_mutex);
+
+ host->mrq = mrq;
+
+ /* check if card is present then send command and data */
+ if (alcor_get_cd(mmc))
+ alcor_send_cmd(host, mrq->cmd, true);
+ else {
+ mrq->cmd->error = -ENOMEDIUM;
+ alcor_request_complete(host, 1);
+ }
+
+ mutex_unlock(&host->cmd_mutex);
+}
+
+static void alcor_pre_req(struct mmc_host *mmc,
+ struct mmc_request *mrq)
+{
+ struct alcor_sdmmc_host *host = mmc_priv(mmc);
+ struct mmc_data *data = mrq->data;
+ struct mmc_command *cmd = mrq->cmd;
+ struct scatterlist *sg;
+ unsigned int i, sg_len;
+
+ if (!data || !cmd)
+ return;
+
+ data->host_cookie = COOKIE_UNMAPPED;
+
+ /* FIXME: looks like the DMA engine works only with CMD18 */
+ if (cmd->opcode != 18)
+ return;
+ /*
+ * We don't do DMA on "complex" transfers, i.e. with
+ * non-word-aligned buffers or lengths. Also, we don't bother
+ * with all the DMA setup overhead for short transfers.
+ */
+ if (data->blocks * data->blksz < AU6601_MAX_DMA_BLOCK_SIZE)
+ return;
+
+ if (data->blksz & 3)
+ return;
+
+ for_each_sg(data->sg, sg, data->sg_len, i) {
+ if (sg->length != AU6601_MAX_DMA_BLOCK_SIZE)
+ return;
+ }
+
+ /* This data might be unmapped at this time */
+
+ sg_len = dma_map_sg(host->dev, data->sg, data->sg_len,
+ mmc_get_dma_dir(data));
+ if (sg_len)
+ data->host_cookie = COOKIE_MAPPED;
+
+ data->sg_count = sg_len;
+}
+
+static void alcor_post_req(struct mmc_host *mmc,
+ struct mmc_request *mrq,
+ int err)
+{
+ struct alcor_sdmmc_host *host = mmc_priv(mmc);
+ struct mmc_data *data = mrq->data;
+
+ if (!data)
+ return;
+
+ if (data->host_cookie == COOKIE_MAPPED) {
+ dma_unmap_sg(host->dev,
+ data->sg,
+ data->sg_len,
+ mmc_get_dma_dir(data));
+ }
+
+ data->host_cookie = COOKIE_UNMAPPED;
+}
+
+static void alcor_set_power_mode(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct alcor_sdmmc_host *host = mmc_priv(mmc);
+ struct alcor_pci_priv *priv = host->alcor_pci;
+
+ switch (ios->power_mode) {
+ case MMC_POWER_OFF:
+ alcor_set_clock(host, ios->clock);
+ /* set all pins to input */
+ alcor_write8(priv, 0, AU6601_OUTPUT_ENABLE);
+ /* turn of VDD */
+ alcor_write8(priv, 0, AU6601_POWER_CONTROL);
+ break;
+ case MMC_POWER_UP:
+ break;
+ case MMC_POWER_ON:
+ /* This is most trickiest part. The order and timings of
+ * instructions seems to play important role. Any changes may
+ * confuse internal state engine if this HW.
+ * FIXME: If we will ever get access to documentation, then this
+ * part should be reviewed again.
+ */
+
+ /* enable SD card mode */
+ alcor_write8(priv, AU6601_SD_CARD,
+ AU6601_ACTIVE_CTRL);
+ /* set signal voltage to 3.3V */
+ alcor_write8(priv, 0, AU6601_OPT);
+ /* no documentation about clk delay, for now just try to mimic
+ * original driver.
+ */
+ alcor_write8(priv, 0x20, AU6601_CLK_DELAY);
+ /* set BUS width to 1 bit */
+ alcor_write8(priv, 0, AU6601_REG_BUS_CTRL);
+ /* set CLK first time */
+ alcor_set_clock(host, ios->clock);
+ /* power on VDD */
+ alcor_write8(priv, AU6601_SD_CARD,
+ AU6601_POWER_CONTROL);
+ /* wait until the CLK will get stable */
+ mdelay(20);
+ /* set CLK again, mimic original driver. */
+ alcor_set_clock(host, ios->clock);
+
+ /* enable output */
+ alcor_write8(priv, AU6601_SD_CARD,
+ AU6601_OUTPUT_ENABLE);
+ /* The clk will not work on au6621. We need to trigger data
+ * transfer.
+ */
+ alcor_write8(priv, AU6601_DATA_WRITE,
+ AU6601_DATA_XFER_CTRL);
+ /* configure timeout. Not clear what exactly it means. */
+ alcor_write8(priv, 0x7d, AU6601_TIME_OUT_CTRL);
+ mdelay(100);
+ break;
+ default:
+ dev_err(host->dev, "Unknown power parameter\n");
+ }
+}
+
+static void alcor_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct alcor_sdmmc_host *host = mmc_priv(mmc);
+
+ mutex_lock(&host->cmd_mutex);
+
+ dev_dbg(host->dev, "set ios. bus width: %x, power mode: %x\n",
+ ios->bus_width, ios->power_mode);
+
+ if (ios->power_mode != host->cur_power_mode) {
+ alcor_set_power_mode(mmc, ios);
+ host->cur_power_mode = ios->power_mode;
+ } else {
+ alcor_set_timing(mmc, ios);
+ alcor_set_bus_width(mmc, ios);
+ alcor_set_clock(host, ios->clock);
+ }
+
+ mutex_unlock(&host->cmd_mutex);
+}
+
+static int alcor_signal_voltage_switch(struct mmc_host *mmc,
+ struct mmc_ios *ios)
+{
+ struct alcor_sdmmc_host *host = mmc_priv(mmc);
+
+ mutex_lock(&host->cmd_mutex);
+
+ switch (ios->signal_voltage) {
+ case MMC_SIGNAL_VOLTAGE_330:
+ alcor_rmw8(host, AU6601_OPT, AU6601_OPT_SD_18V, 0);
+ break;
+ case MMC_SIGNAL_VOLTAGE_180:
+ alcor_rmw8(host, AU6601_OPT, 0, AU6601_OPT_SD_18V);
+ break;
+ default:
+ /* No signal voltage switch required */
+ break;
+ }
+
+ mutex_unlock(&host->cmd_mutex);
+ return 0;
+}
+
+static const struct mmc_host_ops alcor_sdc_ops = {
+ .card_busy = alcor_card_busy,
+ .get_cd = alcor_get_cd,
+ .get_ro = alcor_get_ro,
+ .post_req = alcor_post_req,
+ .pre_req = alcor_pre_req,
+ .request = alcor_request,
+ .set_ios = alcor_set_ios,
+ .start_signal_voltage_switch = alcor_signal_voltage_switch,
+};
+
+static void alcor_timeout_timer(struct work_struct *work)
+{
+ struct delayed_work *d = to_delayed_work(work);
+ struct alcor_sdmmc_host *host = container_of(d, struct alcor_sdmmc_host,
+ timeout_work);
+ mutex_lock(&host->cmd_mutex);
+
+ dev_dbg(host->dev, "triggered timeout\n");
+ if (host->mrq) {
+ dev_err(host->dev, "Timeout waiting for hardware interrupt.\n");
+
+ if (host->data) {
+ host->data->error = -ETIMEDOUT;
+ } else {
+ if (host->cmd)
+ host->cmd->error = -ETIMEDOUT;
+ else
+ host->mrq->cmd->error = -ETIMEDOUT;
+ }
+
+ alcor_reset(host, AU6601_RESET_CMD | AU6601_RESET_DATA);
+ alcor_request_complete(host, 0);
+ }
+
+ mmiowb();
+ mutex_unlock(&host->cmd_mutex);
+}
+
+static void alcor_hw_init(struct alcor_sdmmc_host *host)
+{
+ struct alcor_pci_priv *priv = host->alcor_pci;
+ struct alcor_dev_cfg *cfg = priv->cfg;
+
+ /* FIXME: This part is a mimics HW init of original driver.
+ * If we will ever get access to documentation, then this part
+ * should be reviewed again.
+ */
+
+ /* reset command state engine */
+ alcor_reset(host, AU6601_RESET_CMD);
+
+ alcor_write8(priv, 0, AU6601_DMA_BOUNDARY);
+ /* enable sd card mode */
+ alcor_write8(priv, AU6601_SD_CARD, AU6601_ACTIVE_CTRL);
+
+ /* set BUS width to 1 bit */
+ alcor_write8(priv, 0, AU6601_REG_BUS_CTRL);
+
+ /* reset data state engine */
+ alcor_reset(host, AU6601_RESET_DATA);
+ /* Not sure if a voodoo with AU6601_DMA_BOUNDARY is really needed */
+ alcor_write8(priv, 0, AU6601_DMA_BOUNDARY);
+
+ alcor_write8(priv, 0, AU6601_INTERFACE_MODE_CTRL);
+ /* not clear what we are doing here. */
+ alcor_write8(priv, 0x44, AU6601_PAD_DRIVE0);
+ alcor_write8(priv, 0x44, AU6601_PAD_DRIVE1);
+ alcor_write8(priv, 0x00, AU6601_PAD_DRIVE2);
+
+ /* for 6601 - dma_boundary; for 6621 - dma_page_cnt
+ * exact meaning of this register is not clear.
+ */
+ alcor_write8(priv, cfg->dma, AU6601_DMA_BOUNDARY);
+
+ /* make sure all pins are set to input and VDD is off */
+ alcor_write8(priv, 0, AU6601_OUTPUT_ENABLE);
+ alcor_write8(priv, 0, AU6601_POWER_CONTROL);
+
+ alcor_write8(priv, AU6601_DETECT_EN, AU6601_DETECT_STATUS);
+ /* now we should be safe to enable IRQs */
+ alcor_unmask_sd_irqs(host);
+}
+
+static void alcor_hw_uninit(struct alcor_sdmmc_host *host)
+{
+ struct alcor_pci_priv *priv = host->alcor_pci;
+
+ alcor_mask_sd_irqs(host);
+ alcor_reset(host, AU6601_RESET_CMD | AU6601_RESET_DATA);
+
+ alcor_write8(priv, 0, AU6601_DETECT_STATUS);
+
+ alcor_write8(priv, 0, AU6601_OUTPUT_ENABLE);
+ alcor_write8(priv, 0, AU6601_POWER_CONTROL);
+
+ alcor_write8(priv, 0, AU6601_OPT);
+}
+
+static void alcor_init_mmc(struct alcor_sdmmc_host *host)
+{
+ struct mmc_host *mmc = host->mmc;
+
+ mmc->f_min = AU6601_MIN_CLOCK;
+ mmc->f_max = AU6601_MAX_CLOCK;
+ mmc->ocr_avail = MMC_VDD_33_34;
+ mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SD_HIGHSPEED
+ | MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | MMC_CAP_UHS_SDR50
+ | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50;
+ mmc->caps2 = MMC_CAP2_NO_SDIO;
+ mmc->ops = &alcor_sdc_ops;
+
+ /* Hardware cannot do scatter lists */
+ mmc->max_segs = AU6601_MAX_DMA_SEGMENTS;
+ mmc->max_seg_size = AU6601_MAX_DMA_BLOCK_SIZE;
+
+ mmc->max_blk_size = mmc->max_seg_size;
+ mmc->max_blk_count = mmc->max_segs;
+
+ mmc->max_req_size = mmc->max_seg_size * mmc->max_segs;
+}
+
+static int alcor_pci_sdmmc_drv_probe(struct platform_device *pdev)
+{
+ struct alcor_pci_priv *priv = pdev->dev.platform_data;
+ struct mmc_host *mmc;
+ struct alcor_sdmmc_host *host;
+ int ret;
+
+ mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
+ if (!mmc) {
+ dev_err(&pdev->dev, "Can't allocate MMC\n");
+ return -ENOMEM;
+ }
+
+ host = mmc_priv(mmc);
+ host->mmc = mmc;
+ host->dev = &pdev->dev;
+ host->cur_power_mode = MMC_POWER_UNDEFINED;
+ host->alcor_pci = priv;
+
+ /* make sure irqs are disabled */
+ alcor_write32(priv, 0, AU6601_REG_INT_ENABLE);
+ alcor_write32(priv, 0, AU6601_MS_INT_ENABLE);
+
+ ret = devm_request_threaded_irq(&pdev->dev, priv->irq,
+ alcor_irq, alcor_irq_thread, IRQF_SHARED,
+ DRV_NAME_ALCOR_PCI_SDMMC, host);
+
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to get irq for data line\n");
+ return ret;
+ }
+
+ mutex_init(&host->cmd_mutex);
+ INIT_DELAYED_WORK(&host->timeout_work, alcor_timeout_timer);
+
+ alcor_init_mmc(host);
+ alcor_hw_init(host);
+
+ dev_set_drvdata(&pdev->dev, host);
+ mmc_add_host(mmc);
+ return 0;
+}
+
+static int alcor_pci_sdmmc_drv_remove(struct platform_device *pdev)
+{
+ struct alcor_sdmmc_host *host = dev_get_drvdata(&pdev->dev);
+
+ if (cancel_delayed_work_sync(&host->timeout_work))
+ alcor_request_complete(host, 0);
+
+ alcor_hw_uninit(host);
+ mmc_remove_host(host->mmc);
+ mmc_free_host(host->mmc);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int alcor_pci_sdmmc_suspend(struct device *dev)
+{
+ struct alcor_sdmmc_host *host = dev_get_drvdata(dev);
+
+ if (cancel_delayed_work_sync(&host->timeout_work))
+ alcor_request_complete(host, 0);
+
+ alcor_hw_uninit(host);
+
+ return 0;
+}
+
+static int alcor_pci_sdmmc_resume(struct device *dev)
+{
+ struct alcor_sdmmc_host *host = dev_get_drvdata(dev);
+
+ alcor_hw_init(host);
+
+ return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static SIMPLE_DEV_PM_OPS(alcor_mmc_pm_ops, alcor_pci_sdmmc_suspend,
+ alcor_pci_sdmmc_resume);
+
+static const struct platform_device_id alcor_pci_sdmmc_ids[] = {
+ {
+ .name = DRV_NAME_ALCOR_PCI_SDMMC,
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(platform, alcor_pci_sdmmc_ids);
+
+static struct platform_driver alcor_pci_sdmmc_driver = {
+ .probe = alcor_pci_sdmmc_drv_probe,
+ .remove = alcor_pci_sdmmc_drv_remove,
+ .id_table = alcor_pci_sdmmc_ids,
+ .driver = {
+ .name = DRV_NAME_ALCOR_PCI_SDMMC,
+ .pm = &alcor_mmc_pm_ops
+ },
+};
+module_platform_driver(alcor_pci_sdmmc_driver);
+
+MODULE_AUTHOR("Oleksij Rempel <linux@xxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("PCI driver for Alcor Micro AU6601 Secure Digital Host Controller Interface");
+MODULE_LICENSE("GPL");
--
2.17.1