remoteproc: Introduce Qualcomm ADSP PIL

The Qualcomm ADSP Peripheral Image Loader is used on a variety of
different Qualcomm platforms for loading firmware into and controlling
the Hexagon based ADSP.
Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/remoteproc/Kconfig

@@ -77,6 +77,17 @@ config DA8XX_REMOTEPROC
 	  It's safe to say n here if you're not interested in multimedia
 	  offloading.
 
+config QCOM_ADSP_PIL
+	tristate "Qualcomm ADSP Peripheral Image Loader"
+	depends on OF && ARCH_QCOM
+	depends on QCOM_SMEM
+	select MFD_SYSCON
+	select QCOM_MDT_LOADER
+	select REMOTEPROC
+	help
+	  Say y here to support the TrustZone based Peripherial Image Loader
+	  for the Qualcomm ADSP remote processors.
+
 config QCOM_MDT_LOADER
 	tristate
 

drivers/remoteproc/Makefile

@@ -12,6 +12,7 @@ obj-$(CONFIG_OMAP_REMOTEPROC)		+= omap_remoteproc.o
 obj-$(CONFIG_STE_MODEM_RPROC)	 	+= ste_modem_rproc.o
 obj-$(CONFIG_WKUP_M3_RPROC)		+= wkup_m3_rproc.o
 obj-$(CONFIG_DA8XX_REMOTEPROC)		+= da8xx_remoteproc.o
+obj-$(CONFIG_QCOM_ADSP_PIL)		+= qcom_adsp_pil.o
 obj-$(CONFIG_QCOM_MDT_LOADER)		+= qcom_mdt_loader.o
 obj-$(CONFIG_QCOM_Q6V5_PIL)		+= qcom_q6v5_pil.o
 obj-$(CONFIG_QCOM_WCNSS_PIL)		+= qcom_wcnss_pil.o

drivers/remoteproc/qcom_adsp_pil.c

+/*
+ * Qualcomm ADSP Peripheral Image Loader for MSM8974 and MSM8996
+ *
+ * Copyright (C) 2016 Linaro Ltd
+ * Copyright (C) 2014 Sony Mobile Communications AB
+ * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
+ *
+ * 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.
+ *
+ * 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/firmware.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.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/regulator/consumer.h>
+#include <linux/remoteproc.h>
+#include <linux/soc/qcom/smem.h>
+#include <linux/soc/qcom/smem_state.h>
+
+#include "qcom_mdt_loader.h"
+#include "remoteproc_internal.h"
+
+#define ADSP_CRASH_REASON_SMEM		423
+#define ADSP_FIRMWARE_NAME		"adsp.mdt"
+#define ADSP_PAS_ID			1
+
+struct qcom_adsp {
+	struct device *dev;
+	struct rproc *rproc;
+
+	int wdog_irq;
+	int fatal_irq;
+	int ready_irq;
+	int handover_irq;
+	int stop_ack_irq;
+
+	struct qcom_smem_state *state;
+	unsigned stop_bit;
+
+	struct regulator *cx_supply;
+
+	struct completion start_done;
+	struct completion stop_done;
+
+	phys_addr_t mem_phys;
+	phys_addr_t mem_reloc;
+	void *mem_region;
+	size_t mem_size;
+};
+
+static int adsp_load(struct rproc *rproc, const struct firmware *fw)
+{
+	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
+	phys_addr_t fw_addr;
+	size_t fw_size;
+	bool relocate;
+	int ret;
+
+	ret = qcom_scm_pas_init_image(ADSP_PAS_ID, fw->data, fw->size);
+	if (ret) {
+		dev_err(&rproc->dev, "invalid firmware metadata\n");
+		return ret;
+	}
+
+	ret = qcom_mdt_parse(fw, &fw_addr, &fw_size, &relocate);
+	if (ret) {
+		dev_err(&rproc->dev, "failed to parse mdt header\n");
+		return ret;
+	}
+
+	if (relocate) {
+		adsp->mem_reloc = fw_addr;
+
+		ret = qcom_scm_pas_mem_setup(ADSP_PAS_ID, adsp->mem_phys, fw_size);
+		if (ret) {
+			dev_err(&rproc->dev, "unable to setup memory for image\n");
+			return ret;
+		}
+	}
+
+	return qcom_mdt_load(rproc, fw, rproc->firmware);
+}
+
+static const struct rproc_fw_ops adsp_fw_ops = {
+	.find_rsc_table = qcom_mdt_find_rsc_table,
+	.load = adsp_load,
+};
+
+static int adsp_start(struct rproc *rproc)
+{
+	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
+	int ret;
+
+	ret = regulator_enable(adsp->cx_supply);
+	if (ret)
+		return ret;
+
+	ret = qcom_scm_pas_auth_and_reset(ADSP_PAS_ID);
+	if (ret) {
+		dev_err(adsp->dev,
+			"failed to authenticate image and release reset\n");
+		goto disable_regulators;
+	}
+
+	ret = wait_for_completion_timeout(&adsp->start_done,
+					  msecs_to_jiffies(5000));
+	if (!ret) {
+		dev_err(adsp->dev, "start timed out\n");
+		qcom_scm_pas_shutdown(ADSP_PAS_ID);
+		ret = -ETIMEDOUT;
+		goto disable_regulators;
+	}
+
+	ret = 0;
+
+disable_regulators:
+	regulator_disable(adsp->cx_supply);
+
+	return ret;
+}
+
+static int adsp_stop(struct rproc *rproc)
+{
+	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
+	int ret;
+
+	qcom_smem_state_update_bits(adsp->state,
+				    BIT(adsp->stop_bit),
+				    BIT(adsp->stop_bit));
+
+	ret = wait_for_completion_timeout(&adsp->stop_done,
+					  msecs_to_jiffies(5000));
+	if (ret == 0)
+		dev_err(adsp->dev, "timed out on wait\n");
+
+	qcom_smem_state_update_bits(adsp->state,
+				    BIT(adsp->stop_bit),
+				    0);
+
+	ret = qcom_scm_pas_shutdown(ADSP_PAS_ID);
+	if (ret)
+		dev_err(adsp->dev, "failed to shutdown: %d\n", ret);
+
+	return ret;
+}
+
+static void *adsp_da_to_va(struct rproc *rproc, u64 da, int len)
+{
+	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
+	int offset;
+
+	offset = da - adsp->mem_reloc;
+	if (offset < 0 || offset + len > adsp->mem_size)
+		return NULL;
+
+	return adsp->mem_region + offset;
+}
+
+static const struct rproc_ops adsp_ops = {
+	.start = adsp_start,
+	.stop = adsp_stop,
+	.da_to_va = adsp_da_to_va,
+};
+
+static irqreturn_t adsp_wdog_interrupt(int irq, void *dev)
+{
+	struct qcom_adsp *adsp = dev;
+
+	rproc_report_crash(adsp->rproc, RPROC_WATCHDOG);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t adsp_fatal_interrupt(int irq, void *dev)
+{
+	struct qcom_adsp *adsp = dev;
+	size_t len;
+	char *msg;
+
+	msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, ADSP_CRASH_REASON_SMEM, &len);
+	if (!IS_ERR(msg) && len > 0 && msg[0])
+		dev_err(adsp->dev, "fatal error received: %s\n", msg);
+
+	rproc_report_crash(adsp->rproc, RPROC_FATAL_ERROR);
+
+	if (!IS_ERR(msg))
+		msg[0] = '\0';
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t adsp_ready_interrupt(int irq, void *dev)
+{
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t adsp_handover_interrupt(int irq, void *dev)
+{
+	struct qcom_adsp *adsp = dev;
+
+	complete(&adsp->start_done);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t adsp_stop_ack_interrupt(int irq, void *dev)
+{
+	struct qcom_adsp *adsp = dev;
+
+	complete(&adsp->stop_done);
+
+	return IRQ_HANDLED;
+}
+
+static int adsp_init_regulator(struct qcom_adsp *adsp)
+{
+	adsp->cx_supply = devm_regulator_get(adsp->dev, "cx");
+	if (IS_ERR(adsp->cx_supply))
+		return PTR_ERR(adsp->cx_supply);
+
+	regulator_set_load(adsp->cx_supply, 100000);
+
+	return 0;
+}
+
+static int adsp_request_irq(struct qcom_adsp *adsp,
+			     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_ONESHOT,
+					"adsp", adsp);
+	if (ret)
+		dev_err(&pdev->dev, "request %s IRQ failed\n", name);
+
+	return ret;
+}
+
+static int adsp_alloc_memory_region(struct qcom_adsp *adsp)
+{
+	struct device_node *node;
+	struct resource r;
+	int ret;
+
+	node = of_parse_phandle(adsp->dev->of_node, "memory-region", 0);
+	if (!node) {
+		dev_err(adsp->dev, "no memory-region specified\n");
+		return -EINVAL;
+	}
+
+	ret = of_address_to_resource(node, 0, &r);
+	if (ret)
+		return ret;
+
+	adsp->mem_phys = adsp->mem_reloc = r.start;
+	adsp->mem_size = resource_size(&r);
+	adsp->mem_region = devm_ioremap_wc(adsp->dev, adsp->mem_phys, adsp->mem_size);
+	if (!adsp->mem_region) {
+		dev_err(adsp->dev, "unable to map memory region: %pa+%zx\n",
+			&r.start, adsp->mem_size);
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+static int adsp_probe(struct platform_device *pdev)
+{
+	struct qcom_adsp *adsp;
+	struct rproc *rproc;
+	int ret;
+
+	if (!qcom_scm_is_available())
+		return -EPROBE_DEFER;
+
+	if (!qcom_scm_pas_supported(ADSP_PAS_ID)) {
+		dev_err(&pdev->dev, "PAS is not available for ADSP\n");
+		return -ENXIO;
+	}
+
+	rproc = rproc_alloc(&pdev->dev, pdev->name, &adsp_ops,
+			    ADSP_FIRMWARE_NAME, sizeof(*adsp));
+	if (!rproc) {
+		dev_err(&pdev->dev, "unable to allocate remoteproc\n");
+		return -ENOMEM;
+	}
+
+	rproc->fw_ops = &adsp_fw_ops;
+
+	adsp = (struct qcom_adsp *)rproc->priv;
+	adsp->dev = &pdev->dev;
+	adsp->rproc = rproc;
+	platform_set_drvdata(pdev, adsp);
+
+	init_completion(&adsp->start_done);
+	init_completion(&adsp->stop_done);
+
+	ret = adsp_alloc_memory_region(adsp);
+	if (ret)
+		goto free_rproc;
+
+	ret = adsp_init_regulator(adsp);
+	if (ret)
+		goto free_rproc;
+
+	ret = adsp_request_irq(adsp, pdev, "wdog", adsp_wdog_interrupt);
+	if (ret < 0)
+		goto free_rproc;
+	adsp->wdog_irq = ret;
+
+	ret = adsp_request_irq(adsp, pdev, "fatal", adsp_fatal_interrupt);
+	if (ret < 0)
+		goto free_rproc;
+	adsp->fatal_irq = ret;
+
+	ret = adsp_request_irq(adsp, pdev, "ready", adsp_ready_interrupt);
+	if (ret < 0)
+		goto free_rproc;
+	adsp->ready_irq = ret;
+
+	ret = adsp_request_irq(adsp, pdev, "handover", adsp_handover_interrupt);
+	if (ret < 0)
+		goto free_rproc;
+	adsp->handover_irq = ret;
+
+	ret = adsp_request_irq(adsp, pdev, "stop-ack", adsp_stop_ack_interrupt);
+	if (ret < 0)
+		goto free_rproc;
+	adsp->stop_ack_irq = ret;
+
+	adsp->state = qcom_smem_state_get(&pdev->dev, "stop",
+					  &adsp->stop_bit);
+	if (IS_ERR(adsp->state)) {
+		ret = PTR_ERR(adsp->state);
+		goto free_rproc;
+	}
+
+	ret = rproc_add(rproc);
+	if (ret)
+		goto free_rproc;
+
+	return 0;
+
+free_rproc:
+	rproc_put(rproc);
+
+	return ret;
+}
+
+static int adsp_remove(struct platform_device *pdev)
+{
+	struct qcom_adsp *adsp = platform_get_drvdata(pdev);
+
+	qcom_smem_state_put(adsp->state);
+	rproc_del(adsp->rproc);
+	rproc_put(adsp->rproc);
+
+	return 0;
+}
+
+static const struct of_device_id adsp_of_match[] = {
+	{ .compatible = "qcom,msm8974-adsp-pil" },
+	{ .compatible = "qcom,msm8996-adsp-pil" },
+	{ },
+};
+
+static struct platform_driver adsp_driver = {
+	.probe = adsp_probe,
+	.remove = adsp_remove,
+	.driver = {
+		.name = "qcom_adsp_pil",
+		.of_match_table = adsp_of_match,
+	},
+};
+
+module_platform_driver(adsp_driver);
+MODULE_DESCRIPTION("Qualcomm MSM8974/MSM8996 ADSP Peripherial Image Loader");
+MODULE_LICENSE("GPL v2");