BCM6318, BCM6328, BCM6362 and BCM63268 SoCs have a power domain controller
to enable/disable certain components in order to save power.
Signed-off-by: Álvaro Fernández Rojas <noltari@xxxxxxxxx>
---
drivers/soc/bcm/Kconfig | 8 +
drivers/soc/bcm/Makefile | 1 +
drivers/soc/bcm/bcm63xx-power.c | 374 ++++++++++++++++++++++++++++++++
3 files changed, 383 insertions(+)
create mode 100644 drivers/soc/bcm/bcm63xx-power.c
diff --git a/drivers/soc/bcm/Kconfig b/drivers/soc/bcm/Kconfig
index 648e32693b7e..a2e60d28370b 100644
--- a/drivers/soc/bcm/Kconfig
+++ b/drivers/soc/bcm/Kconfig
@@ -13,6 +13,14 @@ config BCM2835_POWER
firmware means that Linux usage of the same power domain
must be accessed using the RASPBERRYPI_POWER driver
+config BCM63XX_POWER
+ bool "BCM63xx power domain driver"
+ depends on BMIPS_GENERIC || (COMPILE_TEST && OF)
+ select PM_GENERIC_DOMAINS if PM
+ help
+ This enables support for the BCM63xx power domains controller on
+ BCM6318, BCM6328, BCM6362 and BCM63268 SoCs.
+
config RASPBERRYPI_POWER
bool "Raspberry Pi power domain driver"
depends on ARCH_BCM2835 || (COMPILE_TEST && OF)
diff --git a/drivers/soc/bcm/Makefile b/drivers/soc/bcm/Makefile
index d92268a829a9..e6c3d04a4a83 100644
--- a/drivers/soc/bcm/Makefile
+++ b/drivers/soc/bcm/Makefile
@@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_BCM2835_POWER) += bcm2835-power.o
+obj-$(CONFIG_BCM63XX_POWER) += bcm63xx-power.o
obj-$(CONFIG_RASPBERRYPI_POWER) += raspberrypi-power.o
obj-$(CONFIG_SOC_BRCMSTB) += brcmstb/
diff --git a/drivers/soc/bcm/bcm63xx-power.c b/drivers/soc/bcm/bcm63xx-power.c
new file mode 100644
index 000000000000..b6e51b721f09
--- /dev/null
+++ b/drivers/soc/bcm/bcm63xx-power.c
@@ -0,0 +1,374 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * BCM63xx Power Domain Controller Driver
+ *
+ * Copyright (C) 2020 Álvaro Fernández Rojas <noltari@xxxxxxxxx>
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+struct bcm63xx_power_dev {
+ struct generic_pm_domain genpd;
+ struct bcm63xx_power *power;
+ uint32_t mask;
+};
+
+struct bcm63xx_power {
+ void __iomem *base;
+ spinlock_t lock;
+ struct bcm63xx_power_dev *dev;
+ struct genpd_onecell_data genpd_data;
+ struct generic_pm_domain **genpd;
+};
+
+struct bcm63xx_power_data {
+ const char * const name;
+ uint8_t bit;
+ unsigned int flags;
+};
+
+static int bcm63xx_power_get_state(struct bcm63xx_power_dev *pmd, bool *is_on)
+{
+ struct bcm63xx_power *power = pmd->power;
+
+ if (!pmd->mask) {
+ *is_on = false;
+ return -EINVAL;
+ }
+
+ *is_on = !(__raw_readl(power->base) & pmd->mask);
+
+ return 0;
+}
+
+static int bcm63xx_power_set_state(struct bcm63xx_power_dev *pmd, bool on)
+{
+ struct bcm63xx_power *power = pmd->power;
+ unsigned long flags;
+ uint32_t val;
+
+ if (!pmd->mask)
+ return -EINVAL;
+
+ spin_lock_irqsave(&power->lock, flags);
+ val = __raw_readl(power->base);
+ if (on)
+ val &= ~pmd->mask;
+ else
+ val |= pmd->mask;
+ __raw_writel(val, power->base);
+ spin_unlock_irqrestore(&power->lock, flags);
+
+ return 0;
+}
+
+static int bcm63xx_power_on(struct generic_pm_domain *genpd)
+{
+ struct bcm63xx_power_dev *pmd = container_of(genpd,
+ struct bcm63xx_power_dev, genpd);
+
+ return bcm63xx_power_set_state(pmd, true);
+}
+
+static int bcm63xx_power_off(struct generic_pm_domain *genpd)
+{
+ struct bcm63xx_power_dev *pmd = container_of(genpd,
+ struct bcm63xx_power_dev, genpd);
+
+ return bcm63xx_power_set_state(pmd, false);
+}
+
+static int bcm63xx_power_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct resource *res;
+ const struct bcm63xx_power_data *entry, *table;
+ struct bcm63xx_power *power;
+ unsigned int ndom;
+ uint8_t max_bit = 0;
+ int ret;
+
+ power = devm_kzalloc(dev, sizeof(*power), GFP_KERNEL);
+ if (!power)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ power->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(power->base))
+ return PTR_ERR(power->base);
+
+ table = of_device_get_match_data(dev);
+ if (!table)
+ return -EINVAL;
+
+ power->genpd_data.num_domains = 0;
+ ndom = 0;
+ for (entry = table; entry->name; entry++) {
+ max_bit = max(max_bit, entry->bit);
+ ndom++;
+ }
+
+ if (!ndom)
+ return -ENODEV;
+
+ power->genpd_data.num_domains = max_bit + 1;
+
+ power->dev = devm_kcalloc(dev, power->genpd_data.num_domains,
+ sizeof(struct bcm63xx_power_dev),
+ GFP_KERNEL);
+ if (!power->dev)
+ return -ENOMEM;
+
+ power->genpd = devm_kcalloc(dev, power->genpd_data.num_domains,
+ sizeof(struct generic_pm_domain *),
+ GFP_KERNEL);
+ if (!power->genpd)
+ return -ENOMEM;
+
+ power->genpd_data.domains = power->genpd;
+
+ ndom = 0;
+ for (entry = table; entry->name; entry++) {
+ struct bcm63xx_power_dev *pmd = &power->dev[ndom];
+ bool is_on;
+
+ pmd->power = power;
+ pmd->mask = BIT(entry->bit);
+ pmd->genpd.name = entry->name;
+ pmd->genpd.flags = entry->flags;
+
+ ret = bcm63xx_power_get_state(pmd, &is_on);
+ if (ret)
+ dev_warn(dev, "unable to get current state for %s\n",
+ pmd->genpd.name);
+
+ pmd->genpd.power_on = bcm63xx_power_on;
+ pmd->genpd.power_off = bcm63xx_power_off;
+
+ pm_genpd_init(&pmd->genpd, NULL, !is_on);
+ power->genpd[entry->bit] = &pmd->genpd;
+
+ ndom++;
+ }
+
+ spin_lock_init(&power->lock);
+
+ ret = of_genpd_add_provider_onecell(np, &power->genpd_data);
+ if (ret) {
+ dev_err(dev, "failed to register genpd driver: %d\n", ret);
+ return ret;
+ }
+
+ dev_info(dev, "registered %u power domains\n", ndom);
+
+ return 0;
+}
+
+static const struct bcm63xx_power_data bcm6318_power_domains[] = {
+ {
+ .name = "pcie",
+ .bit = 0,
+ }, {
+ .name = "usb",
+ .bit = 1,
+ }, {
+ .name = "ephy0",
+ .bit = 2,
+ }, {
+ .name = "ephy1",
+ .bit = 3,
+ }, {
+ .name = "ephy2",
+ .bit = 4,
+ }, {
+ .name = "ephy3",
+ .bit = 5,
+ }, {
+ .name = "ldo2p5",
+ .bit = 6,
+ .flags = GENPD_FLAG_ALWAYS_ON,
+ }, {
+ .name = "ldo2p9",
+ .bit = 7,
+ .flags = GENPD_FLAG_ALWAYS_ON,
+ }, {
+ .name = "sw1p0",
+ .bit = 8,
+ .flags = GENPD_FLAG_ALWAYS_ON,
+ }, {
+ .name = "pad",
+ .bit = 9,
+ .flags = GENPD_FLAG_ALWAYS_ON,
+ }, {
+ /* sentinel */
+ },
+};
+
+static const struct bcm63xx_power_data bcm6328_power_domains[] = {
+ {
+ .name = "adsl2-mips",
+ .bit = 0,
+ }, {
+ .name = "adsl2-phy",
+ .bit = 1,
+ }, {
+ .name = "adsl2-afe",
+ .bit = 2,
+ }, {
+ .name = "sar",
+ .bit = 3,
+ }, {
+ .name = "pcm",
+ .bit = 4,
+ }, {
+ .name = "usbd",
+ .bit = 5,
+ }, {
+ .name = "usbh",
+ .bit = 6,
+ }, {
+ .name = "pcie",
+ .bit = 7,
+ }, {
+ .name = "robosw",
+ .bit = 8,
+ }, {
+ .name = "ephy",
+ .bit = 9,
+ }, {
+ /* sentinel */
+ },
+};
+
+static const struct bcm63xx_power_data bcm6362_power_domains[] = {
+ {
+ .name = "sar",
+ .bit = 0,
+ }, {
+ .name = "ipsec",
+ .bit = 1,
+ }, {
+ .name = "mips",
+ .bit = 2,
+ .flags = GENPD_FLAG_ALWAYS_ON,
+ }, {
+ .name = "dect",
+ .bit = 3,
+ }, {
+ .name = "usbh",
+ .bit = 4,
+ }, {
+ .name = "usbd",
+ .bit = 5,
+ }, {
+ .name = "robosw",
+ .bit = 6,
+ }, {
+ .name = "pcm",
+ .bit = 7,
+ }, {
+ .name = "periph",
+ .bit = 8,
+ .flags = GENPD_FLAG_ALWAYS_ON,
+ }, {
+ .name = "adsl-phy",
+ .bit = 9,
+ }, {
+ .name = "gmii-pads",
+ .bit = 10,
+ }, {
+ .name = "fap",
+ .bit = 11,
+ }, {
+ .name = "pcie",
+ .bit = 12,
+ }, {
+ .name = "wlan-pads",
+ .bit = 13,
+ }, {
+ /* sentinel */
+ },
+};
+
+static const struct bcm63xx_power_data bcm63268_power_domains[] = {
+ {
+ .name = "sar",
+ .bit = 0,
+ }, {
+ .name = "ipsec",
+ .bit = 1,
+ }, {
+ .name = "mips",
+ .bit = 2,
+ .flags = GENPD_FLAG_ALWAYS_ON,
+ }, {
+ .name = "dect",
+ .bit = 3,
+ }, {
+ .name = "usbh",
+ .bit = 4,
+ }, {
+ .name = "usbd",
+ .bit = 5,
+ }, {
+ .name = "robosw",
+ .bit = 6,
+ }, {
+ .name = "pcm",
+ .bit = 7,
+ }, {
+ .name = "periph",
+ .bit = 8,
+ .flags = GENPD_FLAG_ALWAYS_ON,
+ }, {
+ .name = "vdsl-phy",
+ .bit = 9,
+ }, {
+ .name = "vdsl-mips",
+ .bit = 10,
+ }, {
+ .name = "fap",
+ .bit = 11,
+ }, {
+ .name = "pcie",
+ .bit = 12,
+ }, {
+ .name = "wlan-pads",
+ .bit = 13,
+ }, {
+ /* sentinel */
+ },
+};
+
+static const struct of_device_id bcm63xx_power_of_match[] = {
+ {
+ .compatible = "brcm,bcm6318-power-controller",
+ .data = &bcm6318_power_domains,
+ }, {
+ .compatible = "brcm,bcm6328-power-controller",
+ .data = &bcm6328_power_domains,
+ }, {
+ .compatible = "brcm,bcm6362-power-controller",
+ .data = &bcm6362_power_domains,
+ }, {
+ .compatible = "brcm,bcm63268-power-controller",
+ .data = &bcm63268_power_domains,
+ }, {
+ /* sentinel */
+ }
+};
+
+static struct platform_driver bcm63xx_power_driver = {
+ .driver = {
+ .name = "bcm63xx-power-controller",
+ .of_match_table = bcm63xx_power_of_match,
+ },
+ .probe = bcm63xx_power_probe,
+};
+builtin_platform_driver(bcm63xx_power_driver);
--
2.26.2
