remoteproc: Supply controller driver for ST's Remote Processors (63edb031) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/remoteproc/Kconfig

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Original line number	Diff line number	Diff line
		@@ -77,4 +77,13 @@ config DA8XX_REMOTEPROC
		It's safe to say n here if you're not interested in multimedia
		offloading.

		config ST_REMOTEPROC
		tristate "ST remoteproc support"
		depends on ARCH_STI
		select REMOTEPROC
		help
		Say y here to support ST's adjunct processors via the remote
		processor framework.
		This can be either built-in or a loadable module.

		endmenu

drivers/remoteproc/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -11,3 +11,4 @@ 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_ST_REMOTEPROC) += st_remoteproc.o

drivers/remoteproc/st_remoteproc.c

0 → 100644

+297 −0

Original line number	Diff line number	Diff line
		/*
		* ST's Remote Processor Control Driver
		*
		* Copyright (C) 2015 STMicroelectronics - All Rights Reserved
		*
		* Author: Ludovic Barre <ludovic.barre@st.com>
		*
		* 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/clk.h>
		#include <linux/dma-mapping.h>
		#include <linux/err.h>
		#include <linux/interrupt.h>
		#include <linux/kernel.h>
		#include <linux/mfd/syscon.h>
		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/of_device.h>
		#include <linux/of_reserved_mem.h>
		#include <linux/platform_device.h>
		#include <linux/regmap.h>
		#include <linux/remoteproc.h>
		#include <linux/reset.h>

		struct st_rproc_config {
		bool sw_reset;
		bool pwr_reset;
		unsigned long bootaddr_mask;
		};

		struct st_rproc {
		struct st_rproc_config *config;
		struct reset_control *sw_reset;
		struct reset_control *pwr_reset;
		struct clk *clk;
		u32 clk_rate;
		struct regmap *boot_base;
		u32 boot_offset;
		};

		static int st_rproc_start(struct rproc *rproc)
		{
		struct st_rproc *ddata = rproc->priv;
		int err;

		regmap_update_bits(ddata->boot_base, ddata->boot_offset,
		ddata->config->bootaddr_mask, rproc->bootaddr);

		err = clk_enable(ddata->clk);
		if (err) {
		dev_err(&rproc->dev, "Failed to enable clock\n");
		return err;
		}

		if (ddata->config->sw_reset) {
		err = reset_control_deassert(ddata->sw_reset);
		if (err) {
		dev_err(&rproc->dev, "Failed to deassert S/W Reset\n");
		goto sw_reset_fail;
		}
		}

		if (ddata->config->pwr_reset) {
		err = reset_control_deassert(ddata->pwr_reset);
		if (err) {
		dev_err(&rproc->dev, "Failed to deassert Power Reset\n");
		goto pwr_reset_fail;
		}
		}

		dev_info(&rproc->dev, "Started from 0x%x\n", rproc->bootaddr);

		return 0;


		pwr_reset_fail:
		if (ddata->config->pwr_reset)
		reset_control_assert(ddata->sw_reset);
		sw_reset_fail:
		clk_disable(ddata->clk);

		return err;
		}

		static int st_rproc_stop(struct rproc *rproc)
		{
		struct st_rproc *ddata = rproc->priv;
		int sw_err = 0, pwr_err = 0;

		if (ddata->config->sw_reset) {
		sw_err = reset_control_assert(ddata->sw_reset);
		if (sw_err)
		dev_err(&rproc->dev, "Failed to assert S/W Reset\n");
		}

		if (ddata->config->pwr_reset) {
		pwr_err = reset_control_assert(ddata->pwr_reset);
		if (pwr_err)
		dev_err(&rproc->dev, "Failed to assert Power Reset\n");
		}

		clk_disable(ddata->clk);

		return sw_err ?: pwr_err;
		}

		static struct rproc_ops st_rproc_ops = {
		.start = st_rproc_start,
		.stop = st_rproc_stop,
		};

		/*
		* Fetch state of the processor: 0 is off, 1 is on.
		*/
		static int st_rproc_state(struct platform_device *pdev)
		{
		struct rproc *rproc = platform_get_drvdata(pdev);
		struct st_rproc *ddata = rproc->priv;
		int reset_sw = 0, reset_pwr = 0;

		if (ddata->config->sw_reset)
		reset_sw = reset_control_status(ddata->sw_reset);

		if (ddata->config->pwr_reset)
		reset_pwr = reset_control_status(ddata->pwr_reset);

		if (reset_sw < 0 \|\| reset_pwr < 0)
		return -EINVAL;

		return !reset_sw && !reset_pwr;
		}

		static const struct st_rproc_config st40_rproc_cfg = {
		.sw_reset = true,
		.pwr_reset = true,
		.bootaddr_mask = GENMASK(28, 1),
		};

		static const struct st_rproc_config st231_rproc_cfg = {
		.sw_reset = true,
		.pwr_reset = false,
		.bootaddr_mask = GENMASK(31, 6),
		};

		static const struct of_device_id st_rproc_match[] = {
		{ .compatible = "st,st40-rproc", .data = &st40_rproc_cfg },
		{ .compatible = "st,st231-rproc", .data = &st231_rproc_cfg },
		{},
		};
		MODULE_DEVICE_TABLE(of, st_rproc_match);

		static int st_rproc_parse_dt(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct rproc *rproc = platform_get_drvdata(pdev);
		struct st_rproc *ddata = rproc->priv;
		struct device_node *np = dev->of_node;
		int err;

		if (ddata->config->sw_reset) {
		ddata->sw_reset = devm_reset_control_get(dev, "sw_reset");
		if (IS_ERR(ddata->sw_reset)) {
		dev_err(dev, "Failed to get S/W Reset\n");
		return PTR_ERR(ddata->sw_reset);
		}
		}

		if (ddata->config->pwr_reset) {
		ddata->pwr_reset = devm_reset_control_get(dev, "pwr_reset");
		if (IS_ERR(ddata->pwr_reset)) {
		dev_err(dev, "Failed to get Power Reset\n");
		return PTR_ERR(ddata->pwr_reset);
		}
		}

		ddata->clk = devm_clk_get(dev, NULL);
		if (IS_ERR(ddata->clk)) {
		dev_err(dev, "Failed to get clock\n");
		return PTR_ERR(ddata->clk);
		}

		err = of_property_read_u32(np, "clock-frequency", &ddata->clk_rate);
		if (err) {
		dev_err(dev, "failed to get clock frequency\n");
		return err;
		}

		ddata->boot_base = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
		if (!ddata->boot_base) {
		dev_err(dev, "Boot base not found\n");
		return -EINVAL;
		}

		err = of_property_read_u32_index(np, "st,syscfg", 1,
		&ddata->boot_offset);
		if (err) {
		dev_err(dev, "Boot offset not found\n");
		return -EINVAL;
		}

		err = of_reserved_mem_device_init(dev);
		if (err) {
		dev_err(dev, "Failed to obtain shared memory\n");
		return err;
		}

		err = clk_prepare(ddata->clk);
		if (err)
		dev_err(dev, "failed to get clock\n");

		return err;
		}

		static int st_rproc_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		const struct of_device_id *match;
		struct st_rproc *ddata;
		struct device_node *np = dev->of_node;
		struct rproc *rproc;
		int enabled;
		int ret;

		match = of_match_device(st_rproc_match, dev);
		if (!match \|\| !match->data) {
		dev_err(dev, "No device match found\n");
		return -ENODEV;
		}

		rproc = rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
		if (!rproc)
		return -ENOMEM;

		rproc->has_iommu = false;
		ddata = rproc->priv;
		ddata->config = (struct st_rproc_config *)match->data;

		platform_set_drvdata(pdev, rproc);

		ret = st_rproc_parse_dt(pdev);
		if (ret)
		goto free_rproc;

		enabled = st_rproc_state(pdev);
		if (enabled < 0)
		goto free_rproc;

		if (enabled) {
		atomic_inc(&rproc->power);
		rproc->state = RPROC_RUNNING;
		} else {
		clk_set_rate(ddata->clk, ddata->clk_rate);
		}

		ret = rproc_add(rproc);
		if (ret)
		goto free_rproc;

		return 0;

		free_rproc:
		rproc_put(rproc);
		return ret;
		}

		static int st_rproc_remove(struct platform_device *pdev)
		{
		struct rproc *rproc = platform_get_drvdata(pdev);
		struct st_rproc *ddata = rproc->priv;

		rproc_del(rproc);

		clk_disable_unprepare(ddata->clk);

		of_reserved_mem_device_release(&pdev->dev);

		rproc_put(rproc);

		return 0;
		}

		static struct platform_driver st_rproc_driver = {
		.probe = st_rproc_probe,
		.remove = st_rproc_remove,
		.driver = {
		.name = "st-rproc",
		.of_match_table = of_match_ptr(st_rproc_match),
		},
		};
		module_platform_driver(st_rproc_driver);

		MODULE_DESCRIPTION("ST Remote Processor Control Driver");
		MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>");
		MODULE_LICENSE("GPL v2");