soc: fsl: add RCPM driver (3b8db034) · Commits · 戴 / test

drivers/soc/fsl/Kconfig

+10 −0

Original line number	Diff line number	Diff line
		@@ -40,4 +40,14 @@ config DPAA2_CONSOLE
		/dev/dpaa2_mc_console and /dev/dpaa2_aiop_console,
		which can be used to dump the Management Complex and AIOP
		firmware logs.

		config FSL_RCPM
		bool "Freescale RCPM support"
		depends on PM_SLEEP && (ARM \|\| ARM64)
		help
		The NXP QorIQ Processors based on ARM Core have RCPM module
		(Run Control and Power Management), which performs all device-level
		tasks associated with power management, such as wakeup source control.
		Note that currently this driver will not support PowerPC based
		QorIQ processor.
		endmenu

drivers/soc/fsl/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -6,6 +6,7 @@
		obj-$(CONFIG_FSL_DPAA) += qbman/
		obj-$(CONFIG_QUICC_ENGINE) += qe/
		obj-$(CONFIG_CPM) += qe/
		obj-$(CONFIG_FSL_RCPM) += rcpm.o
		obj-$(CONFIG_FSL_GUTS) += guts.o
		obj-$(CONFIG_FSL_MC_DPIO) += dpio/
		obj-$(CONFIG_DPAA2_CONSOLE) += dpaa2-console.o

drivers/soc/fsl/rcpm.c

0 → 100644

+151 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		//
		// rcpm.c - Freescale QorIQ RCPM driver
		//
		// Copyright 2019 NXP
		//
		// Author: Ran Wang <ran.wang_1@nxp.com>

		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/platform_device.h>
		#include <linux/of_address.h>
		#include <linux/slab.h>
		#include <linux/suspend.h>
		#include <linux/kernel.h>

		#define RCPM_WAKEUP_CELL_MAX_SIZE 7

		struct rcpm {
		unsigned int wakeup_cells;
		void __iomem *ippdexpcr_base;
		bool little_endian;
		};

		/**
		* rcpm_pm_prepare - performs device-level tasks associated with power
		* management, such as programming related to the wakeup source control.
		* @dev: Device to handle.
		*
		*/
		static int rcpm_pm_prepare(struct device *dev)
		{
		int i, ret, idx;
		void __iomem *base;
		struct wakeup_source *ws;
		struct rcpm *rcpm;
		struct device_node *np = dev->of_node;
		u32 value[RCPM_WAKEUP_CELL_MAX_SIZE + 1];
		u32 setting[RCPM_WAKEUP_CELL_MAX_SIZE] = {0};

		rcpm = dev_get_drvdata(dev);
		if (!rcpm)
		return -EINVAL;

		base = rcpm->ippdexpcr_base;
		idx = wakeup_sources_read_lock();

		/* Begin with first registered wakeup source */
		for_each_wakeup_source(ws) {

		/* skip object which is not attached to device */
		if (!ws->dev \|\| !ws->dev->parent)
		continue;

		ret = device_property_read_u32_array(ws->dev->parent,
		"fsl,rcpm-wakeup", value,
		rcpm->wakeup_cells + 1);

		/* Wakeup source should refer to current rcpm device */
		if (ret \|\| (np->phandle != value[0]))
		continue;

		/* Property "#fsl,rcpm-wakeup-cells" of rcpm node defines the
		* number of IPPDEXPCR register cells, and "fsl,rcpm-wakeup"
		* of wakeup source IP contains an integer array: <phandle to
		* RCPM node, IPPDEXPCR0 setting, IPPDEXPCR1 setting,
		* IPPDEXPCR2 setting, etc>.
		*
		* So we will go thought them to collect setting data.
		*/
		for (i = 0; i < rcpm->wakeup_cells; i++)
		setting[i] \|= value[i + 1];
		}

		wakeup_sources_read_unlock(idx);

		/* Program all IPPDEXPCRn once */
		for (i = 0; i < rcpm->wakeup_cells; i++) {
		u32 tmp = setting[i];
		void __iomem address = base + i 4;

		if (!tmp)
		continue;

		/* We can only OR related bits */
		if (rcpm->little_endian) {
		tmp \|= ioread32(address);
		iowrite32(tmp, address);
		} else {
		tmp \|= ioread32be(address);
		iowrite32be(tmp, address);
		}
		}

		return 0;
		}

		static const struct dev_pm_ops rcpm_pm_ops = {
		.prepare = rcpm_pm_prepare,
		};

		static int rcpm_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct resource *r;
		struct rcpm *rcpm;
		int ret;

		rcpm = devm_kzalloc(dev, sizeof(*rcpm), GFP_KERNEL);
		if (!rcpm)
		return -ENOMEM;

		r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (!r)
		return -ENODEV;

		rcpm->ippdexpcr_base = devm_ioremap_resource(&pdev->dev, r);
		if (IS_ERR(rcpm->ippdexpcr_base)) {
		ret = PTR_ERR(rcpm->ippdexpcr_base);
		return ret;
		}

		rcpm->little_endian = device_property_read_bool(
		&pdev->dev, "little-endian");

		ret = device_property_read_u32(&pdev->dev,
		"#fsl,rcpm-wakeup-cells", &rcpm->wakeup_cells);
		if (ret)
		return ret;

		dev_set_drvdata(&pdev->dev, rcpm);

		return 0;
		}

		static const struct of_device_id rcpm_of_match[] = {
		{ .compatible = "fsl,qoriq-rcpm-2.1+", },
		{}
		};
		MODULE_DEVICE_TABLE(of, rcpm_of_match);

		static struct platform_driver rcpm_driver = {
		.driver = {
		.name = "rcpm",
		.of_match_table = rcpm_of_match,
		.pm = &rcpm_pm_ops,
		},
		.probe = rcpm_probe,
		};

		module_platform_driver(rcpm_driver);

Admin message