dm: power: domain: add BCM6328 power domain driver

This allows controlling MISC IDDQ register on BCM6328 SoCs.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

diff --git a/drivers/power/domain/Kconfig b/drivers/power/domain/Kconfig
index 132e33250e8c2d3a8f95edf007d359f51703b0a3..7cfa76149876e72a08f0bca62006995d051dcb3e 100644 (file)
--- a/drivers/power/domain/Kconfig
+++ b/drivers/power/domain/Kconfig
@@ -9,6 +9,13 @@ config POWER_DOMAIN
          domains). This may be used to save power. This API provides the
          means to control such power management hardware.
 
+config BCM6328_POWER_DOMAIN
+       bool "Enable the BCM6328 power domain driver"
+       depends on POWER_DOMAIN && ARCH_BMIPS
+       help
+         Enable support for manipulating BCM6345 power domains via MMIO
+         mapped registers.
+
 config SANDBOX_POWER_DOMAIN
        bool "Enable the sandbox power domain test driver"
        depends on POWER_DOMAIN && SANDBOX

diff --git a/drivers/power/domain/Makefile b/drivers/power/domain/Makefile
index 2c3d92638fbee3002aae593b41353de1d6b76d8c..c7d764440205c9a5b9e99d959cf138a58e9efb36 100644 (file)
--- a/drivers/power/domain/Makefile
+++ b/drivers/power/domain/Makefile
@@ -3,6 +3,7 @@
 # SPDX-License-Identifier: GPL-2.0
 
 obj-$(CONFIG_POWER_DOMAIN) += power-domain-uclass.o
+obj-$(CONFIG_BCM6328_POWER_DOMAIN) += bcm6328-power-domain.o
 obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain.o
 obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain-test.o
 obj-$(CONFIG_TEGRA186_POWER_DOMAIN) += tegra186-power-domain.o

diff --git a/drivers/power/domain/bcm6328-power-domain.c b/drivers/power/domain/bcm6328-power-domain.c
new file mode 100644 (file)
index 0000000..15638bf
--- /dev/null
+++ b/drivers/power/domain/bcm6328-power-domain.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <power-domain-uclass.h>
+#include <asm/io.h>
+
+#define MAX_DOMAINS    32
+
+struct bcm6328_power_domain {
+       void __iomem *regs;
+};
+
+static int bcm6328_power_domain_request(struct power_domain *power_domain)
+{
+       if (power_domain->id >= MAX_DOMAINS)
+               return -EINVAL;
+
+       return 0;
+}
+
+static int bcm6328_power_domain_free(struct power_domain *power_domain)
+{
+       return 0;
+}
+
+static int bcm6328_power_domain_on(struct power_domain *power_domain)
+{
+       struct bcm6328_power_domain *priv = dev_get_priv(power_domain->dev);
+
+       clrbits_be32(priv->regs, BIT(power_domain->id));
+
+       return 0;
+}
+
+static int bcm6328_power_domain_off(struct power_domain *power_domain)
+{
+       struct bcm6328_power_domain *priv = dev_get_priv(power_domain->dev);
+
+       setbits_be32(priv->regs, BIT(power_domain->id));
+
+       return 0;
+}
+
+static int bcm6328_power_domain_probe(struct udevice *dev)
+{
+       struct bcm6328_power_domain *priv = dev_get_priv(dev);
+       fdt_addr_t addr;
+       fdt_size_t size;
+
+       addr = dev_get_addr_size_index(dev, 0, &size);
+       if (addr == FDT_ADDR_T_NONE)
+               return -EINVAL;
+
+       priv->regs = ioremap(addr, size);
+
+       return 0;
+}
+
+static const struct udevice_id bcm6328_power_domain_ids[] = {
+       { .compatible = "brcm,bcm6328-power-domain" },
+       { /* sentinel */ }
+};
+
+struct power_domain_ops bcm6328_power_domain_ops = {
+       .free = bcm6328_power_domain_free,
+       .off = bcm6328_power_domain_off,
+       .on = bcm6328_power_domain_on,
+       .request = bcm6328_power_domain_request,
+};
+
+U_BOOT_DRIVER(bcm6328_power_domain) = {
+       .name = "bcm6328_power_domain",
+       .id = UCLASS_POWER_DOMAIN,
+       .of_match = bcm6328_power_domain_ids,
+       .ops = &bcm6328_power_domain_ops,
+       .priv_auto_alloc_size = sizeof(struct bcm6328_power_domain),
+       .probe = bcm6328_power_domain_probe,
+};