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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/mfd/bcm2835-pm.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/mfd/bcm2835-pm.c')
-rw-r--r--drivers/mfd/bcm2835-pm.c125
1 files changed, 125 insertions, 0 deletions
diff --git a/drivers/mfd/bcm2835-pm.c b/drivers/mfd/bcm2835-pm.c
new file mode 100644
index 0000000000..3cb2b94231
--- /dev/null
+++ b/drivers/mfd/bcm2835-pm.c
@@ -0,0 +1,125 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * PM MFD driver for Broadcom BCM2835
+ *
+ * This driver binds to the PM block and creates the MFD device for
+ * the WDT and power drivers.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/mfd/bcm2835-pm.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+
+static const struct mfd_cell bcm2835_pm_devs[] = {
+ { .name = "bcm2835-wdt" },
+};
+
+static const struct mfd_cell bcm2835_power_devs[] = {
+ { .name = "bcm2835-power" },
+};
+
+static int bcm2835_pm_get_pdata(struct platform_device *pdev,
+ struct bcm2835_pm *pm)
+{
+ if (of_property_present(pm->dev->of_node, "reg-names")) {
+ struct resource *res;
+
+ pm->base = devm_platform_ioremap_resource_byname(pdev, "pm");
+ if (IS_ERR(pm->base))
+ return PTR_ERR(pm->base);
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "asb");
+ if (res) {
+ pm->asb = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(pm->asb))
+ pm->asb = NULL;
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "rpivid_asb");
+ if (res) {
+ pm->rpivid_asb = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(pm->rpivid_asb))
+ pm->rpivid_asb = NULL;
+ }
+
+ return 0;
+ }
+
+ /* If no 'reg-names' property is found we can assume we're using old DTB. */
+ pm->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(pm->base))
+ return PTR_ERR(pm->base);
+
+ pm->asb = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(pm->asb))
+ pm->asb = NULL;
+
+ pm->rpivid_asb = devm_platform_ioremap_resource(pdev, 2);
+ if (IS_ERR(pm->rpivid_asb))
+ pm->rpivid_asb = NULL;
+
+ return 0;
+}
+
+static int bcm2835_pm_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct bcm2835_pm *pm;
+ int ret;
+
+ pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL);
+ if (!pm)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, pm);
+
+ pm->dev = dev;
+
+ ret = bcm2835_pm_get_pdata(pdev, pm);
+ if (ret)
+ return ret;
+
+ ret = devm_mfd_add_devices(dev, -1,
+ bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs),
+ NULL, 0, NULL);
+ if (ret)
+ return ret;
+
+ /*
+ * We'll use the presence of the AXI ASB regs in the
+ * bcm2835-pm binding as the key for whether we can reference
+ * the full PM register range and support power domains.
+ */
+ if (pm->asb)
+ return devm_mfd_add_devices(dev, -1, bcm2835_power_devs,
+ ARRAY_SIZE(bcm2835_power_devs),
+ NULL, 0, NULL);
+ return 0;
+}
+
+static const struct of_device_id bcm2835_pm_of_match[] = {
+ { .compatible = "brcm,bcm2835-pm-wdt", },
+ { .compatible = "brcm,bcm2835-pm", },
+ { .compatible = "brcm,bcm2711-pm", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
+
+static struct platform_driver bcm2835_pm_driver = {
+ .probe = bcm2835_pm_probe,
+ .driver = {
+ .name = "bcm2835-pm",
+ .of_match_table = bcm2835_pm_of_match,
+ },
+};
+module_platform_driver(bcm2835_pm_driver);
+
+MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
+MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");