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The BCM2712 SoC includes a power management block that serves as the power domain for the V3D graphics block. Unlike other PM blocks in the BCM2835 family, it does not feature an ASB register space. Conditionally register the PM device depending on the SoC variant. Signed-off-by: Phil Elwell <phil@raspberrypi.com> Co-developed-by: Stanimir Varbanov <svarbanov@suse.de> Signed-off-by: Stanimir Varbanov <svarbanov@suse.de> Signed-off-by: Andrea della Porta <andrea.porta@suse.com> Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com> Link: https://patch.msgid.link/c0b5793868f138bf5c928a12b2763d3e183e2e59.1772839224.git.andrea.porta@suse.com Signed-off-by: Lee Jones <lee@kernel.org>
128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* PM MFD driver for Broadcom BCM2835
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*
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* This driver binds to the PM block and creates the MFD device for
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* the WDT and power drivers.
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*/
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/mfd/bcm2835-pm.h>
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#include <linux/mfd/core.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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#include <linux/watchdog.h>
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static const struct mfd_cell bcm2835_pm_devs[] = {
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{ .name = "bcm2835-wdt" },
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};
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static const struct mfd_cell bcm2835_power_devs[] = {
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{ .name = "bcm2835-power" },
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};
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static int bcm2835_pm_get_pdata(struct platform_device *pdev,
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struct bcm2835_pm *pm)
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{
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if (of_property_present(pm->dev->of_node, "reg-names")) {
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struct resource *res;
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pm->base = devm_platform_ioremap_resource_byname(pdev, "pm");
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if (IS_ERR(pm->base))
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return PTR_ERR(pm->base);
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "asb");
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if (res) {
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pm->asb = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(pm->asb))
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pm->asb = NULL;
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}
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
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"rpivid_asb");
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if (res) {
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pm->rpivid_asb = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(pm->rpivid_asb))
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pm->rpivid_asb = NULL;
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}
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return 0;
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}
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/* If no 'reg-names' property is found we can assume we're using old DTB. */
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pm->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(pm->base))
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return PTR_ERR(pm->base);
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pm->asb = devm_platform_ioremap_resource(pdev, 1);
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if (IS_ERR(pm->asb))
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pm->asb = NULL;
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pm->rpivid_asb = devm_platform_ioremap_resource(pdev, 2);
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if (IS_ERR(pm->rpivid_asb))
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pm->rpivid_asb = NULL;
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return 0;
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}
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static int bcm2835_pm_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct bcm2835_pm *pm;
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int ret;
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pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL);
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if (!pm)
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return -ENOMEM;
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platform_set_drvdata(pdev, pm);
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pm->dev = dev;
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pm->soc = (uintptr_t)device_get_match_data(dev);
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ret = bcm2835_pm_get_pdata(pdev, pm);
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if (ret)
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return ret;
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ret = devm_mfd_add_devices(dev, -1,
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bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs),
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NULL, 0, NULL);
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if (ret)
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return ret;
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/*
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* We'll use the presence of the AXI ASB regs in the
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* bcm2835-pm binding as the key for whether we can reference
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* the full PM register range and support power domains.
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*/
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if (pm->asb || pm->soc == BCM2835_PM_SOC_BCM2712)
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return devm_mfd_add_devices(dev, -1, bcm2835_power_devs,
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ARRAY_SIZE(bcm2835_power_devs),
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NULL, 0, NULL);
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return 0;
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}
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static const struct of_device_id bcm2835_pm_of_match[] = {
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{ .compatible = "brcm,bcm2835-pm-wdt", },
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{ .compatible = "brcm,bcm2835-pm", .data = (void *)BCM2835_PM_SOC_BCM2835 },
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{ .compatible = "brcm,bcm2711-pm", .data = (void *)BCM2835_PM_SOC_BCM2711 },
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{ .compatible = "brcm,bcm2712-pm", .data = (void *)BCM2835_PM_SOC_BCM2712 },
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{},
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};
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MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
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static struct platform_driver bcm2835_pm_driver = {
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.probe = bcm2835_pm_probe,
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.driver = {
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.name = "bcm2835-pm",
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.of_match_table = bcm2835_pm_of_match,
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},
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};
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module_platform_driver(bcm2835_pm_driver);
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MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
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MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
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