[U-Boot] [PATCH 1/5] dm: reset: add BCM6345 reset driver

Álvaro Fernández Rojas
2017-05-03T13:10:21Z

This is a simplified version of linux/arch/mips/bcm63xx/reset.c

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
---
drivers/reset/Kconfig | 6 +++
drivers/reset/Makefile | 1 +
drivers/reset/reset-bcm6345.c | 89 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 96 insertions(+)
create mode 100644 drivers/reset/reset-bcm6345.c

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index fa77ee4..822d7f1 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -42,6 +42,12 @@ config TEGRA186_RESET
Enable support for manipulating Tegra's on-SoC reset signals via IPC
requests to the BPMP (Boot and Power Management Processor).

+config RESET_BCM6345
+ bool "Reset controller driver for BCM6345"
+ depends on DM_RESET && ARCH_BMIPS
+ help
+ Support reset controller on BCM6345.
+
config RESET_UNIPHIER
bool "Reset controller driver for UniPhier SoCs"
depends on ARCH_UNIPHIER
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 2b96396..f29fb20 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -8,4 +8,5 @@ obj-$(CONFIG_SANDBOX_MBOX) += sandbox-reset-test.o
obj-$(CONFIG_STI_RESET) += sti-reset.o
obj-$(CONFIG_TEGRA_CAR_RESET) += tegra-car-reset.o
obj-$(CONFIG_TEGRA186_RESET) += tegra186-reset.o
+obj-$(CONFIG_RESET_BCM6345) += reset-bcm6345.o
obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o
diff --git a/drivers/reset/reset-bcm6345.c b/drivers/reset/reset-bcm6345.c
new file mode 100644
index 0000000..774c2a7
--- /dev/null
+++ b/drivers/reset/reset-bcm6345.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
+ *
+ * Derived from linux/arch/mips/bcm63xx/reset.c:
+ * Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <reset-uclass.h>
+#include <asm/io.h>
+
+#define MAX_RESETS 32
+
+struct bcm6345_reset_priv {
+ void __iomem *regs;
+};
+
+static int bcm6345_reset_assert(struct reset_ctl *rst)
+{
+ struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
+
+ clrbits_be32(priv->regs, BIT(rst->id));
+ mdelay(20);
+
+ return 0;
+}
+
+static int bcm6345_reset_deassert(struct reset_ctl *rst)
+{
+ struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
+
+ setbits_be32(priv->regs, BIT(rst->id));
+ mdelay(20);
+
+ return 0;
+}
+
+static int bcm6345_reset_free(struct reset_ctl *rst)
+{
+ return 0;
+}
+
+static int bcm6345_reset_request(struct reset_ctl *rst)
+{
+ if (rst->id >= MAX_RESETS)
+ return -EINVAL;
+
+ return bcm6345_reset_assert(rst);
+}
+
+struct reset_ops bcm6345_reset_reset_ops = {
+ .free = bcm6345_reset_free,
+ .request = bcm6345_reset_request,
+ .rst_assert = bcm6345_reset_assert,
+ .rst_deassert = bcm6345_reset_deassert,
+};
+
+static const struct udevice_id bcm6345_reset_ids[] = {
+ { .compatible = "brcm,bcm6345-reset" },
+ { /* sentinel */ }
+};
+
+static int bcm6345_reset_probe(struct udevice *dev)
+{
+ struct bcm6345_reset_priv *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;
+}
+
+U_BOOT_DRIVER(bcm6345_reset) = {
+ .name = "bcm6345-reset",
+ .id = UCLASS_RESET,
+ .of_match = bcm6345_reset_ids,
+ .ops = &bcm6345_reset_reset_ops,
+ .probe = bcm6345_reset_probe,
+ .priv_auto_alloc_size = sizeof(struct bcm6345_reset_priv),
+};
--
2.1.4