Date:   Thu, 29 Jun 2017 19:47:40 +0530
From:   Sricharan R <sricharan@...eaurora.org>
To:     ohad@...ery.com, bjorn.andersson@...aro.org, robh+dt@...nel.org,
        mark.rutland@....com, andy.gross@...aro.org,
        david.brown@...aro.org, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org
Cc:     sricharan@...eaurora.org
Subject: [PATCH 2/3] drivers: remoteproc: Add Hexagon Q6 - WCSS integrated core driver

IPQ8074 has an integrated Hexagon dsp core Q6v5 and a wireless lan
(Lithium) IP. This patch adds the remoteproc driver to reset, load
and boot Q6 firmware.

Signed-off-by: Sricharan R <sricharan@...eaurora.org>
---
 drivers/remoteproc/Kconfig     |  13 +
 drivers/remoteproc/Makefile    |   1 +
 drivers/remoteproc/q6v5-wcss.c | 784 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 798 insertions(+)
 create mode 100644 drivers/remoteproc/q6v5-wcss.c

diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index faad69a..a08eb1d 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -114,6 +114,19 @@ config QCOM_WCNSS_PIL
 	  Say y here to support the Peripheral Image Loader for the Qualcomm
 	  Wireless Connectivity Subsystem.
 
+config QCOM_Q6V5_WCNSS_PIL
+	tristate "Qualcomm Q6V5-WCNSS Peripheral Image Loader"
+	depends on OF && ARCH_QCOM
+	depends on RPMSG_QCOM_SMD || (COMPILE_TEST && RPMSG_QCOM_SMD=n)
+	depends on QCOM_SMEM
+	depends on REMOTEPROC
+	select QCOM_MDT_LOADER
+	select QCOM_RPROC_COMMON
+	select QCOM_SCM
+	help
+	  Say y here to support the Peripheral Image Loader for the Qualcomm
+	  Hexagon V5 + Wireless Connectivity Subsystem.
+
 config ST_REMOTEPROC
 	tristate "ST remoteproc support"
 	depends on ARCH_STI
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index ffc5e43..ebe339f 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_QCOM_ADSP_PIL)		+= qcom_adsp_pil.o
 obj-$(CONFIG_QCOM_RPROC_COMMON)		+= qcom_common.o
 obj-$(CONFIG_QCOM_Q6V5_PIL)		+= qcom_q6v5_pil.o
 obj-$(CONFIG_QCOM_WCNSS_PIL)		+= qcom_wcnss_pil.o
+obj-$(CONFIG_QCOM_Q6V5_WCNSS_PIL)	+= q6v5-wcss.o
 qcom_wcnss_pil-y			+= qcom_wcnss.o
 qcom_wcnss_pil-y			+= qcom_wcnss_iris.o
 obj-$(CONFIG_ST_REMOTEPROC)		+= st_remoteproc.o
diff --git a/drivers/remoteproc/q6v5-wcss.c b/drivers/remoteproc/q6v5-wcss.c
new file mode 100644
index 0000000..52bdc71
--- /dev/null
+++ b/drivers/remoteproc/q6v5-wcss.c
@@ -0,0 +1,784 @@
+/*
+ * Qualcomm q6v5-wcss Peripheral Image Loader
+ *
+ * Copyright (c) 2017, The Linux Foundation. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/elf.h>
+#include <linux/err.h>
+#include <linux/firmware.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/qcom_scm.h>
+#include <linux/regmap.h>
+#include <linux/remoteproc.h>
+#include <linux/reset.h>
+#include <linux/soc/qcom/mdt_loader.h>
+#include <linux/soc/qcom/smem.h>
+#include <linux/soc/qcom/smem_state.h>
+
+#include "qcom_common.h"
+#include "remoteproc_internal.h"
+
+#define WCSS_CRASH_REASON_SMEM 421
+#define WCNSS_PAS_ID		6
+#define STOP_ACK_TIMEOUT_MS 10000
+
+#define QDSP6SS_RST_EVB 0x10
+#define QDSP6SS_RESET 0x14
+#define QDSP6SS_DBG_CFG 0x18
+#define QDSP6SS_XO_CBCR 0x38
+#define QDSP6SS_MEM_PWR_CTL 0xb0
+#define QDSP6SS_BHS_STATUS 0x78
+#define TCSR_GLOBAL_CFG0 0x0
+#define TCSR_GLOBAL_CFG1 0x4
+
+#define QDSP6SS_GFMUX_CTL 0x20
+#define QDSP6SS_PWR_CTL 0x30
+#define TCSR_HALTREQ 0x0
+#define TCSR_HALTACK 0x4
+#define TCSR_Q6_HALTREQ 0x0
+#define TCSR_Q6_HALTACK 0x4
+#define SSCAON_CONFIG 0x8
+#define SSCAON_STATUS 0xc
+#define HALTACK BIT(0)
+#define BHS_EN_REST_ACK BIT(0)
+
+struct q6v5 {
+	struct device *dev;
+	struct qcom_rproc_subdev smd_subdev;
+	phys_addr_t mem_phys;
+	size_t	mem_size;
+	void *mem_region;
+	void __iomem *q6_base;
+	void __iomem *mpm_base;
+	struct regmap *tcsr;
+	unsigned int halt_gbl;
+	unsigned int halt_q6;
+	unsigned int halt_wcss;
+	struct rproc *rproc;
+	struct completion start_done;
+	struct completion stop_done;
+	struct qcom_smem_state *state;
+	unsigned int stop_bit;
+	unsigned int shutdown_bit;
+	bool running;
+	struct clk **clks;
+	int clk_cnt;
+	struct reset_control *wcss_aon_reset;
+	struct reset_control *wcss_reset;
+	struct reset_control *wcss_q6_reset;
+};
+
+static struct resource_table *q6v5_find_rsc_table(struct rproc *rproc,
+						  const struct firmware *fw,
+						  int *tablesz)
+{
+	static struct resource_table table = { .ver = 1, };
+
+	*tablesz = sizeof(table);
+	return &table;
+}
+
+static int q6v5_init_clocks(struct device *dev, struct q6v5 *qproc)
+{
+	int i;
+	const char *cname;
+	struct property *prop;
+
+	qproc->clk_cnt = of_property_count_strings(dev->of_node,
+						   "clock-names");
+
+	if (!qproc->clk_cnt)
+		return 0;
+
+	qproc->clks = devm_kzalloc(dev, sizeof(*qproc->clks) * qproc->clk_cnt,
+				   GFP_KERNEL);
+
+	of_property_for_each_string(dev->of_node, "clock-names", prop, cname) {
+		struct clk *c = devm_clk_get(dev, cname);
+
+		if (IS_ERR_OR_NULL(c)) {
+			if (PTR_ERR(c) != -EPROBE_DEFER)
+				dev_err(dev, "Failed to get %s clock\n", cname);
+
+			return PTR_ERR(c);
+		}
+
+		qproc->clks[i++] = c;
+	}
+
+	return 0;
+}
+
+static int q6v5_clk_enable(struct q6v5 *qproc)
+{
+	int rc;
+	int i;
+
+	for (i = 0; i < qproc->clk_cnt; i++) {
+		rc = clk_prepare_enable(qproc->clks[i]);
+		if (rc)
+			goto err;
+	}
+
+	return 0;
+err:
+	for (i--; i >= 0; i--)
+		clk_disable_unprepare(qproc->clks[i]);
+
+	return rc;
+}
+
+static int wcss_powerdown(struct q6v5 *qproc)
+{
+	unsigned int nretry = 0;
+	unsigned int val = 0;
+	int ret;
+
+	/* Assert WCSS/Q6 HALTREQ - 1 */
+	nretry = 0;
+
+	ret = regmap_update_bits(qproc->tcsr, qproc->halt_wcss + TCSR_HALTREQ,
+				 1, 1);
+	if (ret)
+		return ret;
+
+	while (1) {
+		regmap_read(qproc->tcsr, qproc->halt_wcss + TCSR_HALTACK,
+			    &val);
+		if (val & HALTACK)
+			break;
+		mdelay(1);
+		nretry++;
+		if (nretry >= 10) {
+			pr_warn("can't get TCSR haltACK\n");
+			break;
+		}
+	}
+
+	/* Check HALTACK */
+	/* Set MPM_SSCAON_CONFIG 13 - 2 */
+	val = readl(qproc->mpm_base + SSCAON_CONFIG);
+	val |= BIT(13);
+	writel(val, qproc->mpm_base + SSCAON_CONFIG);
+
+	/* Set MPM_SSCAON_CONFIG 15 - 3 */
+	val = readl(qproc->mpm_base + SSCAON_CONFIG);
+	val |= BIT(15);
+	val &= ~(BIT(16));
+	val &= ~(BIT(17));
+	val &= ~(BIT(18));
+	writel(val, qproc->mpm_base + SSCAON_CONFIG);
+
+	/* Set MPM_SSCAON_CONFIG 1 - 4 */
+	val = readl(qproc->mpm_base + SSCAON_CONFIG);
+	val |= BIT(1);
+	writel(val, qproc->mpm_base + SSCAON_CONFIG);
+
+	/* wait for SSCAON_STATUS to be 0x400 - 5 */
+	nretry = 0;
+	while (1) {
+		val = readl(qproc->mpm_base + SSCAON_STATUS);
+		/* ignore bits 16 to 31 */
+		val &= 0xffff;
+		if (val == BIT(10))
+			break;
+		nretry++;
+		mdelay(1);
+		if (nretry == 10) {
+			pr_warn("can't get SSCAON_STATUS\n");
+			break;
+		}
+	}
+
+	/* Enable Q6/WCSS BLOCK ARES - 6 */
+	reset_control_assert(qproc->wcss_aon_reset);
+
+	/* Enable MPM_WCSSAON_CONFIG 13 - 7 */
+	val = readl(qproc->mpm_base + SSCAON_CONFIG);
+	val &= (~(BIT(13)));
+	writel(val, qproc->mpm_base + SSCAON_CONFIG);
+
+	/* Enable A2AB/ACMT/ECHAB ARES - 8 */
+	/* De-assert WCSS/Q6 HALTREQ - 8 */
+	reset_control_assert(qproc->wcss_reset);
+
+	ret = regmap_update_bits(qproc->tcsr, qproc->halt_wcss + TCSR_HALTREQ,
+				 1, 0);
+
+	return ret;
+}
+
+static int q6_powerdown(struct q6v5 *qproc)
+{
+	int i = 0, ret;
+	unsigned int nretry = 0;
+	unsigned int val = 0;
+
+	/* Halt Q6 bus interface - 9*/
+	ret = regmap_update_bits(qproc->tcsr, qproc->halt_q6 + TCSR_Q6_HALTREQ,
+				 1, 1);
+	if (ret)
+		return ret;
+
+	nretry = 0;
+	while (1) {
+		regmap_read(qproc->tcsr, qproc->halt_q6 + TCSR_Q6_HALTACK,
+			    &val);
+		if (val & HALTACK)
+			break;
+		mdelay(1);
+		nretry++;
+		if (nretry >= 10) {
+			pr_err("can't get TCSR Q6 haltACK\n");
+			break;
+		}
+	}
+
+	/* Disable Q6 Core clock - 10 */
+	val = readl(qproc->q6_base + QDSP6SS_GFMUX_CTL);
+	val &= (~(BIT(1)));
+	writel(val, qproc->q6_base + QDSP6SS_GFMUX_CTL);
+
+	/* Clamp I/O - 11 */
+	val = readl(qproc->q6_base + QDSP6SS_PWR_CTL);
+	val |= BIT(20);
+	writel(val, qproc->q6_base + QDSP6SS_PWR_CTL);
+
+	/* Clamp WL - 12 */
+	val = readl(qproc->q6_base + QDSP6SS_PWR_CTL);
+	val |= BIT(21);
+	writel(val, qproc->q6_base + QDSP6SS_PWR_CTL);
+
+	/* Clear Erase standby - 13 */
+	val = readl(qproc->q6_base + QDSP6SS_PWR_CTL);
+	val &= (~(BIT(18)));
+	writel(val, qproc->q6_base + QDSP6SS_PWR_CTL);
+
+	/* Clear Sleep RTN - 14 */
+	val = readl(qproc->q6_base + QDSP6SS_PWR_CTL);
+	val &= (~(BIT(19)));
+	writel(val, qproc->q6_base + QDSP6SS_PWR_CTL);
+
+	/* turn off QDSP6 memory foot/head switch one bank at a time - 15*/
+	for (i = 0; i < 20; i++) {
+		val = readl(qproc->q6_base + QDSP6SS_MEM_PWR_CTL);
+		val &= (~(BIT(i)));
+		writel(val, qproc->q6_base + QDSP6SS_MEM_PWR_CTL);
+		mdelay(1);
+	}
+
+	/* Assert QMC memory RTN - 16 */
+	val = readl(qproc->q6_base + QDSP6SS_PWR_CTL);
+	val |= BIT(22);
+	writel(val, qproc->q6_base + QDSP6SS_PWR_CTL);
+
+	/* Turn off BHS - 17 */
+	val = readl(qproc->q6_base + QDSP6SS_PWR_CTL);
+	val &= (~(BIT(24)));
+	writel(val, qproc->q6_base + QDSP6SS_PWR_CTL);
+	udelay(1);
+	/* Wait till BHS Reset is done */
+	nretry = 0;
+	while (1) {
+		val = readl(qproc->q6_base + QDSP6SS_BHS_STATUS);
+		if (!(val & BHS_EN_REST_ACK))
+			break;
+		mdelay(1);
+		nretry++;
+		if (nretry >= 10) {
+			pr_err("BHS_STATUS not OFF\n");
+			break;
+		}
+	}
+
+	/* HALT CLEAR - 18 */
+	ret = regmap_update_bits(qproc->tcsr, qproc->halt_q6 + TCSR_Q6_HALTREQ,
+				 1, 0);
+	if (ret)
+		return ret;
+
+	/* Enable Q6 Block reset - 19 */
+	reset_control_assert(qproc->wcss_q6_reset);
+
+	return 0;
+}
+
+static int q6_rproc_stop(struct rproc *rproc)
+{
+	struct q6v5 *qproc = rproc->priv;
+	int ret = 0;
+
+	qproc->running = false;
+
+	/* WCSS powerdown */
+	qcom_smem_state_update_bits(qproc->state, BIT(qproc->stop_bit),
+				    BIT(qproc->stop_bit));
+
+	ret = wait_for_completion_timeout(&qproc->stop_done,
+					  msecs_to_jiffies(5000));
+	if (ret == 0) {
+		dev_err(qproc->dev, "timed out on wait\n");
+		return -ETIMEDOUT;
+	}
+
+	qcom_smem_state_update_bits(qproc->state, BIT(qproc->stop_bit), 0);
+
+	ret = wcss_powerdown(qproc);
+	if (ret)
+		return ret;
+
+	/* Q6 Power down */
+	ret = q6_powerdown(qproc);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int q6_rproc_start(struct rproc *rproc)
+{
+	struct q6v5 *qproc = rproc->priv;
+	int temp = 19;
+	unsigned long val = 0;
+	unsigned int nretry = 0;
+	int ret = 0;
+
+	ret = q6v5_clk_enable(qproc);
+	if (ret) {
+		dev_err(qproc->dev, "failed to enable clocks\n");
+		return ret;
+	}
+
+	/* Release Q6 and WCSS reset */
+	reset_control_deassert(qproc->wcss_reset);
+	reset_control_deassert(qproc->wcss_q6_reset);
+
+	/* Lithium configuration - clock gating and bus arbitration */
+	ret = regmap_update_bits(qproc->tcsr,
+				 qproc->halt_gbl + TCSR_GLOBAL_CFG0,
+				 0x1F, 0x14);
+	if (ret)
+		return ret;
+
+	ret = regmap_update_bits(qproc->tcsr,
+				 qproc->halt_gbl + TCSR_GLOBAL_CFG1,
+				 1, 0);
+	if (ret)
+		return ret;
+
+	/* Write bootaddr to EVB so that Q6WCSS will jump there after reset */
+	writel(rproc->bootaddr >> 4, qproc->q6_base + QDSP6SS_RST_EVB);
+	/* Turn on XO clock. It is required for BHS and memory operation */
+	writel(0x1, qproc->q6_base + QDSP6SS_XO_CBCR);
+	/* Turn on BHS */
+	writel(0x1700000, qproc->q6_base + QDSP6SS_PWR_CTL);
+	udelay(1);
+
+	/* Wait till BHS Reset is done */
+	while (1) {
+		val = readl(qproc->q6_base + QDSP6SS_BHS_STATUS);
+		if (val & BHS_EN_REST_ACK)
+			break;
+		mdelay(1);
+		nretry++;
+		if (nretry >= 10) {
+			pr_err("BHS_STATUS not ON\n");
+			break;
+		}
+	}
+
+	/* Put LDO in bypass mode */
+	writel(0x3700000, qproc->q6_base + QDSP6SS_PWR_CTL);
+	/* De-assert QDSP6 complier memory clamp */
+	writel(0x3300000, qproc->q6_base + QDSP6SS_PWR_CTL);
+	/* De-assert memory peripheral sleep and L2 memory standby */
+	writel(0x33c0000, qproc->q6_base + QDSP6SS_PWR_CTL);
+
+	/* turn on QDSP6 memory foot/head switch one bank at a time */
+	while  (temp >= 0) {
+		val = readl(qproc->q6_base + QDSP6SS_MEM_PWR_CTL);
+		val = val | 1 << temp;
+		writel(val, qproc->q6_base + QDSP6SS_MEM_PWR_CTL);
+		val = readl(qproc->q6_base + QDSP6SS_MEM_PWR_CTL);
+		mdelay(10);
+		temp -= 1;
+	}
+	/* Remove the QDSP6 core memory word line clamp */
+	writel(0x31FFFFF, qproc->q6_base + QDSP6SS_PWR_CTL);
+	/* Remove QDSP6 I/O clamp */
+	writel(0x30FFFFF, qproc->q6_base + QDSP6SS_PWR_CTL);
+
+	/* Bring Q6 out of reset and stop the core */
+	writel(0x5, qproc->q6_base + QDSP6SS_RESET);
+
+	/* Retain debugger state during next QDSP6 reset */
+	writel(0x0, qproc->q6_base + QDSP6SS_DBG_CFG);
+	/* Turn on the QDSP6 core clock */
+	writel(0x102, qproc->q6_base + QDSP6SS_GFMUX_CTL);
+	/* Enable the core to run */
+	writel(0x4, qproc->q6_base + QDSP6SS_RESET);
+
+	ret = wait_for_completion_timeout(&qproc->start_done,
+					  msecs_to_jiffies(5000));
+	if (ret == 0) {
+		dev_err(qproc->dev, "start timed out\n");
+		return -ETIMEDOUT;
+	}
+
+	qproc->running = true;
+
+	return 0;
+}
+
+static struct rproc_ops q6v5_rproc_ops = {
+	.start		= q6_rproc_start,
+	.stop		= q6_rproc_stop,
+};
+
+static struct rproc_fw_ops q6_fw_ops;
+
+static int q6v5_request_irq(struct q6v5 *qproc,
+			    struct platform_device *pdev,
+			    const char *name,
+			    irq_handler_t thread_fn)
+{
+	int ret;
+
+	ret = platform_get_irq_byname(pdev, name);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "no %s IRQ defined\n", name);
+		return ret;
+	}
+
+	ret = devm_request_threaded_irq(&pdev->dev, ret,
+					NULL, thread_fn,
+					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+					"q6v5", qproc);
+	if (ret)
+		dev_err(&pdev->dev, "request %s IRQ failed\n", name);
+
+	return ret;
+}
+
+static irqreturn_t q6v5_fatal_interrupt(int irq, void *dev)
+{
+	struct q6v5 *qproc = dev;
+	char *msg;
+	size_t len;
+
+	if (!qproc->running)
+		return IRQ_HANDLED;
+
+	msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, WCSS_CRASH_REASON_SMEM, &len);
+	if (!IS_ERR(msg) && len > 0 && msg[0])
+		dev_err(qproc->dev, "Fatal error from wcss: %s\n", msg);
+	else
+		dev_err(qproc->dev, "Fatal error received no message!\n");
+
+	rproc_report_crash(qproc->rproc, RPROC_FATAL_ERROR);
+
+	if (!IS_ERR(msg))
+		msg[0] = '\0';
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t q6v5_handover_interrupt(int irq, void *dev)
+{
+	struct q6v5 *qproc = dev;
+
+	complete(&qproc->start_done);
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t q6v5_stop_ack_interrupt(int irq, void *dev)
+{
+	struct q6v5 *qproc = dev;
+
+	complete(&qproc->stop_done);
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t q6v5_wdog_interrupt(int irq, void *dev)
+{
+	struct q6v5 *qproc = dev;
+	char *msg;
+	size_t len;
+
+	if (!qproc->running) {
+		complete(&qproc->stop_done);
+		return IRQ_HANDLED;
+	}
+
+	msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, WCSS_CRASH_REASON_SMEM, &len);
+	if (!IS_ERR(msg) && len > 0 && msg[0])
+		dev_err(qproc->dev, "Watchdog bite from wcss %s\n", msg);
+	else
+		dev_err(qproc->dev, "Watchdog bit received no message!\n");
+
+	rproc_report_crash(qproc->rproc, RPROC_WATCHDOG);
+
+	if (!IS_ERR(msg))
+		msg[0] = '\0';
+
+	return IRQ_HANDLED;
+}
+
+static int q6v5_load(struct rproc *rproc, const struct firmware *fw)
+{
+	struct q6v5 *qproc = (struct q6v5 *)rproc->priv;
+
+	return qcom_mdt_load(qproc->dev, fw, rproc->firmware, WCNSS_PAS_ID,
+			     qproc->mem_region, qproc->mem_phys,
+			     qproc->mem_size, false);
+}
+
+static int q6_alloc_memory_region(struct q6v5 *qproc)
+{
+	struct device_node *node;
+	struct resource r;
+	int ret;
+
+	node = of_parse_phandle(qproc->dev->of_node, "memory-region", 0);
+	if (!node) {
+		dev_err(qproc->dev, "no memory-region specified\n");
+		return -EINVAL;
+	}
+
+	ret = of_address_to_resource(node, 0, &r);
+	if (ret)
+		return ret;
+
+	qproc->mem_phys = r.start;
+	qproc->mem_size = resource_size(&r);
+	qproc->mem_region = devm_ioremap_wc(qproc->dev, qproc->mem_phys,
+					    qproc->mem_size);
+	if (!qproc->mem_region) {
+		dev_err(qproc->dev, "unable to map memory region: %pa+%zx\n",
+			&r.start, qproc->mem_size);
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+static int q6v5_init_mem(struct q6v5 *qproc, struct platform_device *pdev)
+{
+	struct of_phandle_args args;
+	struct resource *res;
+	int ret;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+					   "mpm");
+	if (IS_ERR_OR_NULL(res))
+		return -ENODEV;
+
+	qproc->mpm_base = ioremap(res->start, resource_size(res));
+	if (IS_ERR_OR_NULL(qproc->mpm_base))
+		return PTR_ERR(qproc->mpm_base);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+					   "q6");
+	if (IS_ERR_OR_NULL(res)) {
+		ret = -ENODEV;
+		goto free_mpm;
+	}
+
+	qproc->q6_base = ioremap(res->start, resource_size(res));
+	if (IS_ERR_OR_NULL(qproc->q6_base)) {
+		ret = PTR_ERR(qproc->q6_base);
+		goto free_mpm;
+	}
+
+	ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
+					       "qcom,halt-regs", 3,
+					       0, &args);
+	if (ret < 0)
+		goto free_q6;
+
+	qproc->tcsr = syscon_node_to_regmap(args.np);
+	of_node_put(args.np);
+	if (IS_ERR_OR_NULL(qproc->tcsr)) {
+		ret = PTR_ERR(qproc->tcsr);
+		goto free_q6;
+	}
+
+	qproc->halt_gbl = args.args[0];
+	qproc->halt_q6 = args.args[1];
+	qproc->halt_wcss = args.args[2];
+
+	return 0;
+
+free_q6:
+	iounmap(qproc->q6_base);
+
+free_mpm:
+	iounmap(qproc->mpm_base);
+
+	return ret;
+}
+
+static int q6_rproc_probe(struct platform_device *pdev)
+{
+	struct q6v5 *qproc;
+	struct rproc *rproc;
+	int ret;
+	struct qcom_smem_state *state;
+	unsigned int stop_bit;
+	const char *firmware_name = of_device_get_match_data(&pdev->dev);
+
+	state = qcom_smem_state_get(&pdev->dev, "stop",
+				    &stop_bit);
+	if (IS_ERR(state))
+		/* Wait till SMP2P is registered and up */
+		return -EPROBE_DEFER;
+
+	rproc = rproc_alloc(&pdev->dev, pdev->name, &q6v5_rproc_ops,
+			    firmware_name,
+			    sizeof(*qproc));
+	if (unlikely(!rproc))
+		return -ENOMEM;
+
+	qproc = rproc->priv;
+	qproc->dev = &pdev->dev;
+	qproc->rproc = rproc;
+	rproc->has_iommu = false;
+
+	q6_fw_ops = *rproc->fw_ops;
+	q6_fw_ops.find_rsc_table = q6v5_find_rsc_table;
+	q6_fw_ops.load = q6v5_load;
+
+	q6v5_init_mem(qproc, pdev);
+
+	qproc->wcss_aon_reset = devm_reset_control_get(&pdev->dev,
+						       "wcss_aon_reset");
+	if (IS_ERR(qproc->wcss_aon_reset))
+		return PTR_ERR(qproc->wcss_aon_reset);
+
+	qproc->wcss_reset = devm_reset_control_get(&pdev->dev,
+						   "wcss_reset");
+	if (IS_ERR(qproc->wcss_reset))
+		return PTR_ERR(qproc->wcss_reset);
+
+	qproc->wcss_q6_reset = devm_reset_control_get(&pdev->dev,
+						      "wcss_q6_reset");
+	if (IS_ERR(qproc->wcss_q6_reset))
+		return PTR_ERR(qproc->wcss_q6_reset);
+
+	platform_set_drvdata(pdev, qproc);
+
+	rproc->fw_ops = &q6_fw_ops;
+
+	qproc->state = qcom_smem_state_get(&pdev->dev, "stop",
+					   &qproc->stop_bit);
+	if (IS_ERR(qproc->state)) {
+		pr_err("Can't get stop bit status fro SMP2P\n");
+		goto free_rproc;
+	}
+
+	qproc->state = qcom_smem_state_get(&pdev->dev, "shutdown",
+			&qproc->shutdown_bit);
+	if (IS_ERR(qproc->state)) {
+		pr_err("Can't get shutdown bit status fro SMP2P\n");
+		goto free_rproc;
+	}
+
+	ret = q6v5_init_clocks(&pdev->dev, qproc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to get active clocks.\n");
+		goto free_rproc;
+	}
+
+	ret = q6v5_request_irq(qproc, pdev, "wdog", q6v5_wdog_interrupt);
+	if (ret < 0)
+		goto free_rproc;
+
+	ret = q6v5_request_irq(qproc, pdev, "fatal", q6v5_fatal_interrupt);
+	if (ret < 0)
+		goto free_rproc;
+
+	ret = q6v5_request_irq(qproc, pdev, "handover",
+			       q6v5_handover_interrupt);
+	if (ret < 0)
+		goto free_rproc;
+
+	ret = q6v5_request_irq(qproc, pdev, "stop-ack",
+			       q6v5_stop_ack_interrupt);
+	if (ret < 0)
+		goto free_rproc;
+
+	init_completion(&qproc->start_done);
+	init_completion(&qproc->stop_done);
+
+	ret = q6_alloc_memory_region(qproc);
+	if (ret < 0)
+		goto free_rproc;
+
+	qcom_add_smd_subdev(rproc, &qproc->smd_subdev);
+
+	ret = rproc_add(rproc);
+	if (ret)
+		goto free_rproc;
+
+	qproc->running = false;
+
+	return 0;
+
+free_rproc:
+	rproc_put(rproc);
+	return -EIO;
+}
+
+static int q6_rproc_remove(struct platform_device *pdev)
+{
+	struct q6v5 *qproc;
+	struct rproc *rproc;
+
+	qproc = platform_get_drvdata(pdev);
+	rproc = qproc->rproc;
+
+	rproc_del(rproc);
+	rproc_put(rproc);
+
+	return 0;
+}
+
+static const struct of_device_id q6_match_table[] = {
+	{ .compatible = "q6v5-wcss-pil", .data = "IPQ8074/q6_fw.mdt" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, q6_match_table);
+
+static struct platform_driver q6_rproc_driver = {
+	.probe = q6_rproc_probe,
+	.remove = q6_rproc_remove,
+	.driver = {
+		.name = "q6v5-wcss",
+		.of_match_table = q6_match_table,
+		.owner = THIS_MODULE,
+	},
+};
+module_platform_driver(q6_rproc_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Qualcomm q6v5-wcss remote proc control driver");
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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