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* [RFC PATCH V3 17/21] mmc: sdhci: UHS-II support, implement operations as a module
@ 2020-07-10 11:12 Ben Chuang
  0 siblings, 0 replies; only message in thread
From: Ben Chuang @ 2020-07-10 11:12 UTC (permalink / raw)
  To: adrian.hunter, ulf.hansson
  Cc: linux-mmc, linux-kernel, ben.chuang, takahiro.akashi, greg.tu,
	Ben Chuang

From: AKASHI Takahiro <takahiro.akashi@linaro.org>

All the UHS-II operations in struct sdhci_uhs2_ops are implemented here
and exported as a kernel module.

Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
---
 drivers/mmc/host/Makefile     |   1 +
 drivers/mmc/host/sdhci-uhs2.c | 794 ++++++++++++++++++++++++++++++++++
 2 files changed, 795 insertions(+)
 create mode 100644 drivers/mmc/host/sdhci-uhs2.c

diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 4d5bcb0144a0..e51430d8f85d 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_MMC_PXA)		+= pxamci.o
 obj-$(CONFIG_MMC_MXC)		+= mxcmmc.o
 obj-$(CONFIG_MMC_MXS)		+= mxs-mmc.o
 obj-$(CONFIG_MMC_SDHCI)		+= sdhci.o
+obj-$(CONFIG_MMC_SDHCI_UHS2)	+= sdhci-uhs2.o
 obj-$(CONFIG_MMC_SDHCI_PCI)	+= sdhci-pci.o
 sdhci-pci-y			+= sdhci-pci-core.o sdhci-pci-o2micro.o sdhci-pci-arasan.o \
 				   sdhci-pci-dwc-mshc.o sdhci-pci-gli.o
diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
new file mode 100644
index 000000000000..3cb13071dd9d
--- /dev/null
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -0,0 +1,794 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  linux/drivers/mmc/host/sdhci_uhs2.c - Secure Digital Host Controller
+ *  Interface driver
+ *
+ *  Copyright (C) 2014 Intel Corp, All Rights Reserved.
+ *  Copyright (C) 2020 Genesys Logic, Inc.
+ *  Authors: Ben Chuang <ben.chuang@genesyslogic.com.tw>
+ *  Copyright (C) 2020 Linaro Limited
+ *  Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
+ */
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/mmc/mmc.h>
+
+#include "sdhci.h"
+#include "sdhci-uhs2.h"
+
+#define DRIVER_NAME "sdhci_uhs2"
+#define DBG(f, x...) \
+	pr_debug(DRIVER_NAME " [%s()]: " f, __func__, ## x)
+
+static void sdhci_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set)
+{
+	u32 ier;
+
+	ier = sdhci_readl(host, SDHCI_INT_ENABLE);
+	ier &= ~clear;
+	ier |= set;
+	sdhci_writel(host, ier, SDHCI_INT_ENABLE);
+	sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE);
+}
+
+/**
+ * sdhci_uhs2_clear_set_irqs - set Error Interrupt Status Enable register
+ * @host:	SDHCI host
+ * @clear:	bit-wise clear mask
+ * @set:	bit-wise set mask
+ *
+ * Set/unset bits in UHS-II Error Interrupt Status Enable register
+ */
+void sdhci_uhs2_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set)
+{
+	u32 ier;
+
+	ier = sdhci_readl(host, SDHCI_UHS2_ERR_INT_STATUS_EN);
+	ier &= ~clear;
+	ier |= set;
+	sdhci_writel(host, ier, SDHCI_UHS2_ERR_INT_STATUS_EN);
+	sdhci_writel(host, ier, SDHCI_UHS2_ERR_INT_SIG_EN);
+}
+EXPORT_SYMBOL_GPL(sdhci_uhs2_clear_set_irqs);
+
+/**
+ * sdhci_uhs2_reset - invoke SW reset
+ * @host: SDHCI host
+ * @mask: Control mask
+ *
+ * Invoke SW reset, depending on a bit in @mask and wait for completion.
+ */
+void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask)
+{
+	unsigned long timeout;
+
+	if (!(host->mmc->caps & MMC_CAP_UHS2))
+		return;
+
+	sdhci_writew(host, mask, SDHCI_UHS2_SW_RESET);
+
+	if (mask & SDHCI_UHS2_SW_RESET_FULL) {
+		host->clock = 0;
+		/* Reset-all turns off SD Bus Power */
+		if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
+			sdhci_runtime_pm_bus_off(host);
+	}
+
+	/* Wait max 100 ms */
+	timeout = 10000;
+
+	/* hw clears the bit when it's done */
+	while (sdhci_readw(host, SDHCI_UHS2_SW_RESET) & mask) {
+		if (timeout == 0) {
+			pr_err("%s: %s: Reset 0x%x never completed.\n",
+			       __func__, mmc_hostname(host->mmc), (int)mask);
+			pr_err("%s: clean reset bit\n",
+			       mmc_hostname(host->mmc));
+			sdhci_writeb(host, 0, SDHCI_UHS2_SW_RESET);
+			return;
+		}
+		timeout--;
+		udelay(10);
+	}
+}
+EXPORT_SYMBOL_GPL(sdhci_uhs2_reset);
+
+static u8 sdhci_calc_timeout_uhs2(struct sdhci_host *host, u8 *cmd_res,
+				  u8 *dead_lock)
+{
+	u8 count;
+	unsigned int cmd_res_timeout, dead_lock_timeout, current_timeout;
+
+	/*
+	 * If the host controller provides us with an incorrect timeout
+	 * value, just skip the check and use 0xE.  The hardware may take
+	 * longer to time out, but that's much better than having a too-short
+	 * timeout value.
+	 */
+	if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL) {
+		*cmd_res = 0xE;
+		*dead_lock = 0xE;
+		return 0xE;
+	}
+
+	/* timeout in us */
+	cmd_res_timeout = 5 * 1000;
+	dead_lock_timeout = 1 * 1000 * 1000;
+
+	/*
+	 * Figure out needed cycles.
+	 * We do this in steps in order to fit inside a 32 bit int.
+	 * The first step is the minimum timeout, which will have a
+	 * minimum resolution of 6 bits:
+	 * (1) 2^13*1000 > 2^22,
+	 * (2) host->timeout_clk < 2^16
+	 *     =>
+	 *     (1) / (2) > 2^6
+	 */
+	count = 0;
+	current_timeout = (1 << 13) * 1000 / host->timeout_clk;
+	while (current_timeout < cmd_res_timeout) {
+		count++;
+		current_timeout <<= 1;
+		if (count >= 0xF)
+			break;
+	}
+
+	if (count >= 0xF) {
+		DBG("%s: Too large timeout 0x%x requested for CMD_RES!\n",
+		    mmc_hostname(host->mmc), count);
+		count = 0xE;
+	}
+	*cmd_res = count;
+
+	count = 0;
+	current_timeout = (1 << 13) * 1000 / host->timeout_clk;
+	while (current_timeout < dead_lock_timeout) {
+		count++;
+		current_timeout <<= 1;
+		if (count >= 0xF)
+			break;
+	}
+
+	if (count >= 0xF) {
+		DBG("%s: Too large timeout 0x%x requested for DEADLOCK!\n",
+		    mmc_hostname(host->mmc), count);
+		count = 0xE;
+	}
+	*dead_lock = count;
+
+	return count;
+}
+
+static void sdhci_uhs2_set_timeout(struct sdhci_host *host)
+{
+	u8 cmd_res, dead_lock;
+
+	sdhci_calc_timeout_uhs2(host, &cmd_res, &dead_lock);
+	cmd_res |= dead_lock << SDHCI_UHS2_TIMER_CTRL_DEADLOCK_SHIFT;
+	sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL);
+}
+
+static void sdhci_uhs2_set_transfer_mode(struct sdhci_host *host,
+					 struct mmc_command *cmd)
+{
+	u16 mode;
+	struct mmc_data *data = cmd->data;
+	u16 arg;
+
+	if (!data) {
+		/* clear Auto CMD settings for no data CMDs */
+		arg = cmd->uhs2_cmd->arg;
+		if ((((arg & 0xF) << 8) | ((arg >> 8) & 0xFF)) ==
+		       UHS2_DEV_CMD_TRANS_ABORT) {
+			mode =  0;
+		} else {
+			mode = sdhci_readw(host, SDHCI_UHS2_TRANS_MODE);
+			if (cmd->opcode == MMC_STOP_TRANSMISSION ||
+			    cmd->opcode == MMC_ERASE)
+				mode |= SDHCI_UHS2_TRNS_WAIT_EBSY;
+			else
+				/* send status mode */
+				if (cmd->opcode == MMC_SEND_STATUS)
+					mode = 0;
+		}
+
+		if (IS_ENABLED(CONFIG_MMC_DEBUG))
+			DBG("UHS2 no data trans mode is 0x%x.\n", mode);
+
+		sdhci_writew(host, mode, SDHCI_UHS2_TRANS_MODE);
+		return;
+	}
+
+	WARN_ON(!host->data);
+
+	mode = SDHCI_UHS2_TRNS_BLK_CNT_EN | SDHCI_UHS2_TRNS_WAIT_EBSY;
+	if (data->flags & MMC_DATA_WRITE)
+		mode |= SDHCI_UHS2_TRNS_DATA_TRNS_WRT;
+
+	if (data->blocks == 1 &&
+	    data->blksz != 512 &&
+	    cmd->opcode != MMC_READ_SINGLE_BLOCK &&
+	    cmd->opcode != MMC_WRITE_BLOCK) {
+		mode &= ~SDHCI_UHS2_TRNS_BLK_CNT_EN;
+		mode |= SDHCI_UHS2_TRNS_BLK_BYTE_MODE;
+	}
+
+	if (host->flags & SDHCI_REQ_USE_DMA)
+		mode |= SDHCI_UHS2_TRNS_DMA;
+
+	if ((host->mmc->flags & MMC_UHS2_2L_HD) && !cmd->uhs2_tmode0_flag)
+		mode |= SDHCI_UHS2_TRNS_2L_HD;
+
+	sdhci_writew(host, mode, SDHCI_UHS2_TRANS_MODE);
+
+	if (IS_ENABLED(CONFIG_MMC_DEBUG))
+		DBG("UHS2 trans mode is 0x%x.\n", mode);
+}
+
+static void sdhci_uhs2_send_command(struct sdhci_host *host,
+				    struct mmc_command *cmd)
+{
+	int i, j;
+	int cmd_reg;
+
+	if (host->mmc->flags & MMC_UHS2_INITIALIZED) {
+		if (!cmd->uhs2_cmd) {
+			pr_err("%s: fatal error, no uhs2_cmd!\n",
+			       mmc_hostname(host->mmc));
+			return;
+		}
+	}
+
+	i = 0;
+	sdhci_writel(host,
+		     ((u32)cmd->uhs2_cmd->arg << 16) |
+				(u32)cmd->uhs2_cmd->header,
+		     SDHCI_UHS2_CMD_PACKET + i);
+	i += 4;
+
+	/*
+	 * Per spec, playload (config) should be MSB before sending out.
+	 * But we don't need convert here because had set payload as
+	 * MSB when preparing config read/write commands.
+	 */
+	for (j = 0; j < cmd->uhs2_cmd->payload_len / sizeof(u32); j++) {
+		sdhci_writel(host, *(cmd->uhs2_cmd->payload + j),
+			     SDHCI_UHS2_CMD_PACKET + i);
+		i += 4;
+	}
+
+	for ( ; i < SDHCI_UHS2_CMD_PACK_MAX_LEN; i += 4)
+		sdhci_writel(host, 0, SDHCI_UHS2_CMD_PACKET + i);
+
+	if (IS_ENABLED(CONFIG_MMC_DEBUG)) {
+		DBG("UHS2 CMD packet_len = %d.\n", cmd->uhs2_cmd->packet_len);
+		for (i = 0; i < cmd->uhs2_cmd->packet_len; i++)
+			DBG("UHS2 CMD_PACKET[%d] = 0x%x.\n", i,
+			    sdhci_readb(host, SDHCI_UHS2_CMD_PACKET + i));
+	}
+
+	cmd_reg = cmd->uhs2_cmd->packet_len <<
+		SDHCI_UHS2_COMMAND_PACK_LEN_SHIFT;
+	if ((cmd->flags & MMC_CMD_MASK) == MMC_CMD_ADTC)
+		cmd_reg |= SDHCI_UHS2_COMMAND_DATA;
+	if (cmd->opcode == MMC_STOP_TRANSMISSION)
+		cmd_reg |= SDHCI_UHS2_COMMAND_CMD12;
+
+	/* UHS2 Native ABORT */
+	if ((cmd->uhs2_cmd->header & UHS2_NATIVE_PACKET) &&
+	    ((((cmd->uhs2_cmd->arg & 0xF) << 8) |
+	    ((cmd->uhs2_cmd->arg >> 8) & 0xFF)) == UHS2_DEV_CMD_TRANS_ABORT))
+		cmd_reg |= SDHCI_UHS2_COMMAND_TRNS_ABORT;
+
+	/* UHS2 Native DORMANT */
+	if ((cmd->uhs2_cmd->header & UHS2_NATIVE_PACKET) &&
+	    ((((cmd->uhs2_cmd->arg & 0xF) << 8) |
+	     ((cmd->uhs2_cmd->arg >> 8) & 0xFF)) ==
+				UHS2_DEV_CMD_GO_DORMANT_STATE))
+		cmd_reg |= SDHCI_UHS2_COMMAND_DORMANT;
+
+	DBG("0x%x is set to UHS2 CMD register.\n", cmd_reg);
+
+	sdhci_writew(host, cmd_reg, SDHCI_UHS2_COMMAND);
+}
+
+static void sdhci_uhs2_finish_command(struct sdhci_host *host)
+{
+	int i;
+	bool b_read_a0 = 0;
+
+	if (host->mmc->flags & MMC_UHS2_INITIALIZED) {
+		u8 resp;
+		u8 ecode;
+
+		resp = sdhci_readb(host, SDHCI_UHS2_RESPONSE + 2);
+		if (resp & UHS2_RES_NACK_MASK) {
+			ecode = (resp >> UHS2_RES_ECODE_POS) &
+				UHS2_RES_ECODE_MASK;
+			pr_err("%s: NACK is got, ECODE=0x%x.\n",
+			       mmc_hostname(host->mmc), ecode);
+		}
+		b_read_a0 = 1;
+	}
+
+	if (host->cmd->uhs2_resp &&
+	    host->cmd->uhs2_resp_len &&
+	    host->cmd->uhs2_resp_len <= 20) {
+		/* Get whole response of some native CCMD, like
+		 * DEVICE_INIT, ENUMERATE.
+		 */
+		for (i = 0; i < host->cmd->uhs2_resp_len; i++)
+			host->cmd->uhs2_resp[i] =
+				sdhci_readb(host,
+					    SDHCI_UHS2_RESPONSE + i);
+	} else {
+		/* Get SD CMD response and Payload for some read
+		 * CCMD, like INQUIRY_CFG.
+		 */
+		/* Per spec (p136), payload field is divided into
+		 * a unit of DWORD and transmission order within
+		 * a DWORD is big endian.
+		 */
+		if (!b_read_a0)
+			sdhci_readl(host, SDHCI_UHS2_RESPONSE);
+		for (i = 4; i < 20; i += 4) {
+			host->cmd->resp[i / 4 - 1] =
+				(sdhci_readb(host,
+					     SDHCI_UHS2_RESPONSE + i) << 24) |
+				(sdhci_readb(host,
+					     SDHCI_UHS2_RESPONSE + i + 1)
+					<< 16) |
+				(sdhci_readb(host,
+					     SDHCI_UHS2_RESPONSE + i + 2)
+					<< 8) |
+				sdhci_readb(host, SDHCI_UHS2_RESPONSE + i + 3);
+		}
+	}
+}
+
+static void sdhci_uhs2_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
+{
+	u8 cmd_res, dead_lock;
+	u16 ctrl_2;
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	/* UHS2 Timeout Control */
+	sdhci_calc_timeout_uhs2(host, &cmd_res, &dead_lock);
+
+	/* change to use calculate value */
+	cmd_res |= dead_lock << SDHCI_UHS2_TIMER_CTRL_DEADLOCK_SHIFT;
+
+	sdhci_uhs2_clear_set_irqs(host,
+				  SDHCI_UHS2_ERR_INT_STATUS_RES_TIMEOUT |
+				  SDHCI_UHS2_ERR_INT_STATUS_DEADLOCK_TIMEOUT,
+				  0);
+	sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL);
+	sdhci_uhs2_clear_set_irqs(host, 0,
+				  SDHCI_UHS2_ERR_INT_STATUS_RES_TIMEOUT |
+				  SDHCI_UHS2_ERR_INT_STATUS_DEADLOCK_TIMEOUT);
+
+	/* UHS2 timing */
+	ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+	if (ios->timing == MMC_TIMING_UHS2)
+		ctrl_2 |= SDHCI_CTRL_UHS_2 | SDHCI_CTRL_UHS2_INTERFACE_EN;
+	else
+		ctrl_2 &= ~(SDHCI_CTRL_UHS_2 | SDHCI_CTRL_UHS2_INTERFACE_EN);
+	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
+
+	if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
+		sdhci_enable_preset_value(host, true);
+
+	/* Set VDD2 */
+	ios->vdd = fls(host->mmc->ocr_avail) - 1;
+	ios->vdd2 = fls(host->mmc->ocr_avail_uhs2) - 1;
+
+	sdhci_set_power(host, ios->power_mode, ios->vdd, ios->vdd2);
+	udelay(100);
+
+	host->timing = ios->timing;
+	sdhci_set_clock(host, host->clock);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static int sdhci_uhs2_interface_detect(struct sdhci_host *host)
+{
+	int timeout = 100;
+
+	udelay(200); /* wait for 200us before check */
+
+	while (!(sdhci_readl(host, SDHCI_PRESENT_STATE) &
+		SDHCI_UHS2_IF_DETECT)) {
+		if (timeout == 0) {
+			pr_warn("%s: not detect UHS2 interface in 200us.\n",
+				mmc_hostname(host->mmc));
+			sdhci_dumpregs(host);
+			return -EIO;
+		}
+		timeout--;
+		mdelay(1);
+	}
+
+	/* Enable UHS2 error interrupts */
+	sdhci_uhs2_clear_set_irqs(host, SDHCI_INT_ALL_MASK,
+				  SDHCI_UHS2_ERR_INT_STATUS_MASK);
+
+	timeout = 150;
+	while (!(sdhci_readl(host, SDHCI_PRESENT_STATE) &
+		SDHCI_UHS2_LANE_SYNC)) {
+		if (timeout == 0) {
+			pr_warn("%s: UHS2 Lane sync fail in 150ms.\n",
+				mmc_hostname(host->mmc));
+			sdhci_dumpregs(host);
+			return -EIO;
+		}
+		timeout--;
+		mdelay(1);
+	}
+
+	DBG("%s: UHS2 Lane synchronized in UHS2 mode, PHY is initialized.\n",
+	    mmc_hostname(host->mmc));
+	return 0;
+}
+
+static int sdhci_uhs2_init(struct sdhci_host *host)
+{
+	u16 caps_ptr = 0;
+	u32 caps_gen = 0;
+	u32 caps_phy = 0;
+	u32 caps_tran[2] = {0, 0};
+	struct mmc_host *mmc = host->mmc;
+
+	/*
+	 * TODO: may add corresponding members in sdhci_host to
+	 * keep these caps.
+	 */
+	caps_ptr = sdhci_readw(host, SDHCI_UHS2_HOST_CAPS_PTR);
+	if (caps_ptr < 0x100 || caps_ptr > 0x1FF) {
+		pr_err("%s: SDHCI_UHS2_HOST_CAPS_PTR(%d) is wrong.\n",
+		       mmc_hostname(mmc), caps_ptr);
+		return -ENODEV;
+	}
+	caps_gen = sdhci_readl(host,
+			       caps_ptr + SDHCI_UHS2_HOST_CAPS_GEN_OFFSET);
+	caps_phy = sdhci_readl(host,
+			       caps_ptr + SDHCI_UHS2_HOST_CAPS_PHY_OFFSET);
+	caps_tran[0] = sdhci_readl(host,
+				   caps_ptr + SDHCI_UHS2_HOST_CAPS_TRAN_OFFSET);
+	caps_tran[1] = sdhci_readl(host,
+				   caps_ptr
+					+ SDHCI_UHS2_HOST_CAPS_TRAN_1_OFFSET);
+
+	/* General Caps */
+	mmc->uhs2_caps.dap = caps_gen & SDHCI_UHS2_HOST_CAPS_GEN_DAP_MASK;
+	mmc->uhs2_caps.gap = (caps_gen & SDHCI_UHS2_HOST_CAPS_GEN_GAP_MASK) >>
+			     SDHCI_UHS2_HOST_CAPS_GEN_GAP_SHIFT;
+	mmc->uhs2_caps.n_lanes = (caps_gen & SDHCI_UHS2_HOST_CAPS_GEN_LANE_MASK)
+			>> SDHCI_UHS2_HOST_CAPS_GEN_LANE_SHIFT;
+	mmc->uhs2_caps.addr64 =
+		(caps_gen & SDHCI_UHS2_HOST_CAPS_GEN_ADDR_64) ? 1 : 0;
+	mmc->uhs2_caps.card_type =
+		(caps_gen & SDHCI_UHS2_HOST_CAPS_GEN_DEV_TYPE_MASK) >>
+		SDHCI_UHS2_HOST_CAPS_GEN_DEV_TYPE_SHIFT;
+
+	/* PHY Caps */
+	mmc->uhs2_caps.phy_rev = caps_phy & SDHCI_UHS2_HOST_CAPS_PHY_REV_MASK;
+	mmc->uhs2_caps.speed_range =
+		(caps_phy & SDHCI_UHS2_HOST_CAPS_PHY_RANGE_MASK)
+		>> SDHCI_UHS2_HOST_CAPS_PHY_RANGE_SHIFT;
+	mmc->uhs2_caps.n_lss_sync =
+		(caps_phy & SDHCI_UHS2_HOST_CAPS_PHY_N_LSS_SYN_MASK)
+		>> SDHCI_UHS2_HOST_CAPS_PHY_N_LSS_SYN_SHIFT;
+	mmc->uhs2_caps.n_lss_dir =
+		(caps_phy & SDHCI_UHS2_HOST_CAPS_PHY_N_LSS_DIR_MASK)
+		>> SDHCI_UHS2_HOST_CAPS_PHY_N_LSS_DIR_SHIFT;
+	if (mmc->uhs2_caps.n_lss_sync == 0)
+		mmc->uhs2_caps.n_lss_sync = 16 << 2;
+	else
+		mmc->uhs2_caps.n_lss_sync <<= 2;
+	if (mmc->uhs2_caps.n_lss_dir == 0)
+		mmc->uhs2_caps.n_lss_dir = 16 << 3;
+	else
+		mmc->uhs2_caps.n_lss_dir <<= 3;
+
+	/* LINK/TRAN Caps */
+	mmc->uhs2_caps.link_rev =
+		caps_tran[0] & SDHCI_UHS2_HOST_CAPS_TRAN_LINK_REV_MASK;
+	mmc->uhs2_caps.n_fcu =
+		(caps_tran[0] & SDHCI_UHS2_HOST_CAPS_TRAN_N_FCU_MASK)
+		>> SDHCI_UHS2_HOST_CAPS_TRAN_N_FCU_SHIFT;
+	if (mmc->uhs2_caps.n_fcu == 0)
+		mmc->uhs2_caps.n_fcu = 256;
+	mmc->uhs2_caps.host_type =
+		(caps_tran[0] & SDHCI_UHS2_HOST_CAPS_TRAN_HOST_TYPE_MASK)
+		>> SDHCI_UHS2_HOST_CAPS_TRAN_HOST_TYPE_SHIFT;
+	mmc->uhs2_caps.maxblk_len =
+		(caps_tran[0] & SDHCI_UHS2_HOST_CAPS_TRAN_BLK_LEN_MASK)
+		>> SDHCI_UHS2_HOST_CAPS_TRAN_BLK_LEN_SHIFT;
+	mmc->uhs2_caps.n_data_gap =
+		caps_tran[1] & SDHCI_UHS2_HOST_CAPS_TRAN_1_N_DATA_GAP_MASK;
+
+	return 0;
+}
+
+static int sdhci_uhs2_do_detect_init(struct sdhci_host *host)
+{
+	unsigned long flags;
+	int ret = -EIO;
+
+	DBG("%s: begin UHS2 init.\n", __func__);
+	spin_lock_irqsave(&host->lock, flags);
+
+	if (sdhci_uhs2_interface_detect(host)) {
+		pr_warn("%s: cannot detect UHS2 interface.\n",
+			mmc_hostname(host->mmc));
+		goto out;
+	}
+
+	if (sdhci_uhs2_init(host)) {
+		pr_warn("%s: UHS2 init fail.\n", mmc_hostname(host->mmc));
+		goto out;
+	}
+
+	/* Init complete, do soft reset and enable UHS2 error irqs. */
+	sdhci_uhs2_reset(host, SDHCI_UHS2_SW_RESET_SD);
+	sdhci_uhs2_clear_set_irqs(host, SDHCI_INT_ALL_MASK,
+				  SDHCI_UHS2_ERR_INT_STATUS_MASK);
+	/*
+	 * !!! SDHCI_INT_ENABLE and SDHCI_SIGNAL_ENABLE was cleared
+	 * by SDHCI_UHS2_SW_RESET_SD
+	 */
+	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
+	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
+
+	ret = 0;
+out:
+	spin_unlock_irqrestore(&host->lock, flags);
+	return ret;
+}
+
+static void sdhci_uhs2_set_config(struct sdhci_host *host)
+{
+	u32 value;
+	u16 sdhci_uhs2_set_ptr = sdhci_readw(host, SDHCI_UHS2_SET_PTR);
+	u16 sdhci_uhs2_gen_set_reg = (sdhci_uhs2_set_ptr + 0);
+	u16 sdhci_uhs2_phy_set_reg = (sdhci_uhs2_set_ptr + 4);
+	u16 sdhci_uhs2_tran_set_reg = (sdhci_uhs2_set_ptr + 8);
+	u16 sdhci_uhs2_tran_set_1_reg = (sdhci_uhs2_set_ptr + 12);
+
+	/* Set Gen Settings */
+	sdhci_writel(host, host->mmc->uhs2_caps.n_lanes_set <<
+		SDHCI_UHS2_GEN_SET_N_LANES_POS, sdhci_uhs2_gen_set_reg);
+
+	/* Set PHY Settings */
+	value = (host->mmc->uhs2_caps.n_lss_dir_set <<
+			SDHCI_UHS2_PHY_SET_N_LSS_DIR_POS) |
+		(host->mmc->uhs2_caps.n_lss_sync_set <<
+			SDHCI_UHS2_PHY_SET_N_LSS_SYN_POS);
+	if (host->mmc->flags & MMC_UHS2_SPEED_B)
+		value |= 1 << SDHCI_UHS2_PHY_SET_SPEED_POS;
+	sdhci_writel(host, value, sdhci_uhs2_phy_set_reg);
+
+	/* Set LINK-TRAN Settings */
+	value = (host->mmc->uhs2_caps.max_retry_set <<
+			SDHCI_UHS2_TRAN_SET_RETRY_CNT_POS) |
+		(host->mmc->uhs2_caps.n_fcu_set <<
+			SDHCI_UHS2_TRAN_SET_N_FCU_POS);
+	sdhci_writel(host, value, sdhci_uhs2_tran_set_reg);
+	sdhci_writel(host, host->mmc->uhs2_caps.n_data_gap_set,
+		     sdhci_uhs2_tran_set_1_reg);
+}
+
+static int sdhci_uhs2_check_dormant(struct sdhci_host *host)
+{
+	int timeout = 100;
+
+	while (!(sdhci_readl(host, SDHCI_PRESENT_STATE) &
+		SDHCI_UHS2_IN_DORMANT_STATE)) {
+		if (timeout == 0) {
+			pr_warn("%s: UHS2 IN_DORMANT fail in 100ms.\n",
+				mmc_hostname(host->mmc));
+			sdhci_dumpregs(host);
+			return -EIO;
+		}
+		timeout--;
+		mdelay(1);
+	}
+	return 0;
+}
+
+static int sdhci_uhs2_do_set_reg(struct sdhci_host *host, enum uhs2_act act)
+{
+	unsigned long flags;
+	int err = 0;
+	u16 sdhci_uhs2_set_ptr = sdhci_readw(host, SDHCI_UHS2_SET_PTR);
+	u16 sdhci_uhs2_phy_set_reg = (sdhci_uhs2_set_ptr + 4);
+
+	DBG("Begin sdhci_uhs2_set_reg, act %d.\n", act);
+	spin_lock_irqsave(&host->lock, flags);
+
+	switch (act) {
+	case SET_CONFIG:
+		sdhci_uhs2_set_config(host);
+		break;
+	case ENABLE_INT:
+		sdhci_clear_set_irqs(host, 0, SDHCI_INT_CARD_INT);
+		break;
+	case DISABLE_INT:
+		sdhci_clear_set_irqs(host, SDHCI_INT_CARD_INT, 0);
+		break;
+	case SET_SPEED_B:
+		sdhci_writeb(host, 1 << SDHCI_UHS2_PHY_SET_SPEED_POS,
+			     sdhci_uhs2_phy_set_reg);
+		break;
+	case CHECK_DORMANT:
+		err = sdhci_uhs2_check_dormant(host);
+		break;
+	default:
+		pr_err("%s: input action %d is wrong!\n",
+		       mmc_hostname(host->mmc), act);
+		err = -EIO;
+		break;
+	}
+
+	spin_unlock_irqrestore(&host->lock, flags);
+	return err;
+}
+
+static void sdhci_uhs2_irq(struct sdhci_host *host)
+{
+	u32 uhs2mask;
+	struct mmc_command *cmd = host->cmd;
+
+	uhs2mask = sdhci_readl(host, SDHCI_UHS2_ERR_INT_STATUS);
+	DBG("*** %s got UHS2 interrupt: 0x%08x\n",
+	    mmc_hostname(host->mmc), uhs2mask);
+
+	sdhci_writel(host, uhs2mask & SDHCI_UHS2_ERR_INT_STATUS_MASK,
+		     SDHCI_UHS2_ERR_INT_STATUS);
+
+	if (!(uhs2mask & SDHCI_UHS2_ERR_INT_STATUS_MASK))
+		return;
+
+	if (uhs2mask & SDHCI_UHS2_ERR_INT_STATUS_CMD_MASK) {
+		if (!host->cmd) {
+			pr_err("%s: Got cmd interrupt 0x%08x but no cmd.\n",
+			       mmc_hostname(host->mmc),
+			       (unsigned int)uhs2mask);
+			sdhci_dumpregs(host);
+			return;
+		}
+		host->cmd->error = -EILSEQ;
+		if (uhs2mask & SDHCI_UHS2_ERR_INT_STATUS_RES_TIMEOUT)
+			host->cmd->error = -ETIMEDOUT;
+	}
+
+	if (uhs2mask & SDHCI_UHS2_ERR_INT_STATUS_DATA_MASK) {
+		if (!host->data) {
+			pr_err("%s: Got data interrupt 0x%08x but no data.\n",
+			       mmc_hostname(host->mmc),
+			       (unsigned int)uhs2mask);
+			sdhci_dumpregs(host);
+			return;
+		}
+
+		if (uhs2mask & SDHCI_UHS2_ERR_INT_STATUS_DEADLOCK_TIMEOUT) {
+			pr_err("%s: Got deadlock timeout interrupt 0x%08x\n",
+			       mmc_hostname(host->mmc),
+			       (unsigned int)uhs2mask);
+			host->data->error = -ETIMEDOUT;
+		} else if (uhs2mask & SDHCI_UHS2_ERR_INT_STATUS_ADMA) {
+			pr_err("%s: ADMA error = 0x %x\n",
+			       mmc_hostname(host->mmc),
+			       sdhci_readb(host, SDHCI_ADMA_ERROR));
+			host->data->error = -EIO;
+		} else {
+			host->data->error = -EILSEQ;
+		}
+	}
+
+	if (host->data && host->data->error)
+		sdhci_finish_data(host);
+	else
+		sdhci_finish_mrq(host, cmd->mrq);
+}
+
+static int sdhci_uhs2_add_host(struct sdhci_host *host, u32 caps1)
+{
+	struct mmc_host *mmc;
+	u32 max_current_caps2;
+
+	if (host->version < SDHCI_SPEC_400)
+		return 0;
+
+	mmc = host->mmc;
+
+	/* Support UHS2 */
+	if (caps1 & SDHCI_SUPPORT_UHS2) {
+		mmc->caps |= MMC_CAP_UHS2;
+		mmc->flags |= MMC_UHS2_SUPPORT;
+	}
+
+	max_current_caps2 = sdhci_readl(host, SDHCI_MAX_CURRENT_1);
+
+	if ((caps1 & SDHCI_SUPPORT_VDD2_180) &&
+	    !max_current_caps2 &&
+	    !IS_ERR(mmc->supply.vmmc2)) {
+		/* UHS2 - VDD2 */
+		int curr = regulator_get_current_limit(mmc->supply.vmmc2);
+
+		if (curr > 0) {
+			/* convert to SDHCI_MAX_CURRENT format */
+			curr = curr / 1000;  /* convert to mA */
+			curr = curr / SDHCI_MAX_CURRENT_MULTIPLIER;
+			curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
+			max_current_caps2 = curr;
+		}
+	}
+
+	if (caps1 & SDHCI_SUPPORT_VDD2_180) {
+		mmc->ocr_avail_uhs2 |= MMC_VDD2_165_195;
+		/*
+		 * UHS2 doesn't require this. Only UHS-I bus needs to set
+		 * max current.
+		 */
+		mmc->max_current_180_vdd2 = (max_current_caps2 &
+					SDHCI_MAX_CURRENT_VDD2_180_MASK) *
+					SDHCI_MAX_CURRENT_MULTIPLIER;
+	} else {
+		mmc->caps &= ~MMC_CAP_UHS2;
+		mmc->flags &= ~MMC_UHS2_SUPPORT;
+	}
+
+	return 0;
+}
+
+static void sdhci_uhs2_remove_host(struct sdhci_host *host, int dead)
+{
+	if (!(host->mmc) || !(host->mmc->flags & MMC_UHS2_SUPPORT))
+		return;
+
+	if (!dead)
+		sdhci_uhs2_reset(host, SDHCI_UHS2_SW_RESET_FULL);
+
+	sdhci_writel(host, 0, SDHCI_UHS2_ERR_INT_STATUS_EN);
+	sdhci_writel(host, 0, SDHCI_UHS2_ERR_INT_SIG_EN);
+	host->mmc->flags &= ~MMC_UHS2_SUPPORT;
+	host->mmc->flags &= ~MMC_UHS2_INITIALIZED;
+}
+
+static int __init sdhci_uhs2_host_init(void)
+{
+	sdhci_uhs2_ops.reset = sdhci_uhs2_reset;
+	sdhci_uhs2_ops.set_timeout = sdhci_uhs2_set_timeout;
+	sdhci_uhs2_ops.set_transfer_mode = sdhci_uhs2_set_transfer_mode;
+	sdhci_uhs2_ops.send_command = sdhci_uhs2_send_command;
+	sdhci_uhs2_ops.finish_command = sdhci_uhs2_finish_command;
+	sdhci_uhs2_ops.do_set_ios = sdhci_uhs2_do_set_ios;
+	sdhci_uhs2_ops.do_detect_init = sdhci_uhs2_do_detect_init;
+	sdhci_uhs2_ops.do_set_reg = sdhci_uhs2_do_set_reg;
+	sdhci_uhs2_ops.irq = sdhci_uhs2_irq;
+	sdhci_uhs2_ops.add_host = sdhci_uhs2_add_host;
+	sdhci_uhs2_ops.remove_host = sdhci_uhs2_remove_host;
+
+	return 0;
+}
+module_init(sdhci_uhs2_host_init);
+
+static void __exit sdhci_uhs2_exit(void)
+{
+	struct sdhci_uhs2_ops nops = {};
+
+	sdhci_uhs2_ops = nops;
+}
+module_exit(sdhci_uhs2_exit);
+
+MODULE_AUTHOR("Intel, Genesys Logic, Linaro");
+MODULE_DESCRIPTION("MMC UHS-II Support");
+MODULE_LICENSE("GPL v2");
-- 
2.27.0


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2020-07-10 11:12 [RFC PATCH V3 17/21] mmc: sdhci: UHS-II support, implement operations as a module Ben Chuang

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