Merge tag 'reset-for-4.5-2' of git://git.pengutronix.de/git/pza/linux into next/drivers

Merge "Reset controller changes for v4.5 v2" from Philipp Zabel:

- oftree support for getting reset devices by index
- fixed return value consistency of of_reset_control_get
- added support for STi co-processor resets
- added STi status callback
- added HiSilicon Hi6220 reset driver
- added ath79 system restart support
- various fixes

* tag 'reset-for-4.5-2' of git://git.pengutronix.de/git/pza/linux:
  reset: ath79: Add system restart support
  arm64: dts: Add reset dts config for Hisilicon Hi6220 SoC
  reset: hi6220: Reset driver for hisilicon hi6220 SoC
  reset: hisilicon: document hisi-hi6220 reset controllers bindings
  reset: remove unused device pointer from struct reset_control

Documentation/devicetree/bindings/reset/hisilicon,hi6220-reset.txt

+Hisilicon System Reset Controller
+======================================
+
+Please also refer to reset.txt in this directory for common reset
+controller binding usage.
+
+The reset controller registers are part of the system-ctl block on
+hi6220 SoC.
+
+Required properties:
+- compatible: may be "hisilicon,hi6220-sysctrl"
+- reg: should be register base and length as documented in the
+  datasheet
+- #reset-cells: 1, see below
+
+Example:
+sys_ctrl: sys_ctrl@f7030000 {
+	compatible = "hisilicon,hi6220-sysctrl", "syscon";
+	reg = <0x0 0xf7030000 0x0 0x2000>;
+	#clock-cells = <1>;
+	#reset-cells = <1>;
+};
+
+Specifying reset lines connected to IP modules
+==============================================
+example:
+
+        uart1: serial@..... {
+                ...
+                resets = <&sys_ctrl PERIPH_RSTEN3_UART1>;
+                ...
+        };
+
+The index could be found in <dt-bindings/reset/hisi,hi6220-resets.h>.

arch/arm64/boot/dts/hisilicon/hi6220.dtsi

@@ -147,6 +147,7 @@ sys_ctrl: sys_ctrl@f7030000 {
 			compatible = "hisilicon,hi6220-sysctrl", "syscon";
 			reg = <0x0 0xf7030000 0x0 0x2000>;
 			#clock-cells = <1>;
+			#reset-cells = <1>;
 		};
 
 		media_ctrl: media_ctrl@f4410000 {

drivers/reset/Kconfig

@@ -13,3 +13,4 @@ menuconfig RESET_CONTROLLER
 	  If unsure, say no.
 
 source "drivers/reset/sti/Kconfig"
+source "drivers/reset/hisilicon/Kconfig"

drivers/reset/Makefile

@@ -4,5 +4,6 @@ obj-$(CONFIG_ARCH_SOCFPGA) += reset-socfpga.o
 obj-$(CONFIG_ARCH_BERLIN) += reset-berlin.o
 obj-$(CONFIG_ARCH_SUNXI) += reset-sunxi.o
 obj-$(CONFIG_ARCH_STI) += sti/
+obj-$(CONFIG_ARCH_HISI) += hisilicon/
 obj-$(CONFIG_ARCH_ZYNQ) += reset-zynq.o
 obj-$(CONFIG_ATH79) += reset-ath79.o

drivers/reset/core.c

@@ -30,7 +30,6 @@ static LIST_HEAD(reset_controller_list);
  */
 struct reset_control {
 	struct reset_controller_dev *rcdev;
-	struct device *dev;
 	unsigned int id;
 };
 
@@ -236,16 +235,10 @@ EXPORT_SYMBOL_GPL(of_reset_control_get);
  */
 struct reset_control *reset_control_get(struct device *dev, const char *id)
 {
-	struct reset_control *rstc;
-
 	if (!dev)
 		return ERR_PTR(-EINVAL);
 
-	rstc = of_reset_control_get(dev->of_node, id);
-	if (!IS_ERR(rstc))
-		rstc->dev = dev;
-
-	return rstc;
+	return of_reset_control_get(dev->of_node, id);
 }
 EXPORT_SYMBOL_GPL(reset_control_get);
 

drivers/reset/hisilicon/Kconfig

+config COMMON_RESET_HI6220
+	tristate "Hi6220 Reset Driver"
+	depends on (ARCH_HISI && RESET_CONTROLLER)
+	help
+	  Build the Hisilicon Hi6220 reset driver.

drivers/reset/hisilicon/Makefile

+obj-$(CONFIG_COMMON_RESET_HI6220) += hi6220_reset.o

drivers/reset/hisilicon/hi6220_reset.c

+/*
+ * Hisilicon Hi6220 reset controller driver
+ *
+ * Copyright (c) 2015 Hisilicon Limited.
+ *
+ * Author: Feng Chen <puck.chen@hisilicon.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/of.h>
+#include <linux/reset-controller.h>
+#include <linux/reset.h>
+#include <linux/platform_device.h>
+
+#define ASSERT_OFFSET            0x300
+#define DEASSERT_OFFSET          0x304
+#define MAX_INDEX                0x509
+
+#define to_reset_data(x) container_of(x, struct hi6220_reset_data, rc_dev)
+
+struct hi6220_reset_data {
+	void __iomem			*assert_base;
+	void __iomem			*deassert_base;
+	struct reset_controller_dev	rc_dev;
+};
+
+static int hi6220_reset_assert(struct reset_controller_dev *rc_dev,
+			       unsigned long idx)
+{
+	struct hi6220_reset_data *data = to_reset_data(rc_dev);
+
+	int bank = idx >> 8;
+	int offset = idx & 0xff;
+
+	writel(BIT(offset), data->assert_base + (bank * 0x10));
+
+	return 0;
+}
+
+static int hi6220_reset_deassert(struct reset_controller_dev *rc_dev,
+				 unsigned long idx)
+{
+	struct hi6220_reset_data *data = to_reset_data(rc_dev);
+
+	int bank = idx >> 8;
+	int offset = idx & 0xff;
+
+	writel(BIT(offset), data->deassert_base + (bank * 0x10));
+
+	return 0;
+}
+
+static struct reset_control_ops hi6220_reset_ops = {
+	.assert = hi6220_reset_assert,
+	.deassert = hi6220_reset_deassert,
+};
+
+static int hi6220_reset_probe(struct platform_device *pdev)
+{
+	struct hi6220_reset_data *data;
+	struct resource *res;
+	void __iomem *src_base;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	src_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(src_base))
+		return PTR_ERR(src_base);
+
+	data->assert_base = src_base + ASSERT_OFFSET;
+	data->deassert_base = src_base + DEASSERT_OFFSET;
+	data->rc_dev.nr_resets = MAX_INDEX;
+	data->rc_dev.ops = &hi6220_reset_ops;
+	data->rc_dev.of_node = pdev->dev.of_node;
+
+	reset_controller_register(&data->rc_dev);
+
+	return 0;
+}
+
+static const struct of_device_id hi6220_reset_match[] = {
+	{ .compatible = "hisilicon,hi6220-sysctrl" },
+	{ },
+};
+
+static struct platform_driver hi6220_reset_driver = {
+	.probe = hi6220_reset_probe,
+	.driver = {
+		.name = "reset-hi6220",
+		.of_match_table = hi6220_reset_match,
+	},
+};
+
+static int __init hi6220_reset_init(void)
+{
+	return platform_driver_register(&hi6220_reset_driver);
+}
+
+postcore_initcall(hi6220_reset_init);

drivers/reset/reset-ath79.c

@@ -15,13 +15,17 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/reset-controller.h>
+#include <linux/reboot.h>
 
 struct ath79_reset {
 	struct reset_controller_dev rcdev;
+	struct notifier_block restart_nb;
 	void __iomem *base;
 	spinlock_t lock;
 };
 
+#define FULL_CHIP_RESET 24
+
 static int ath79_reset_update(struct reset_controller_dev *rcdev,
 			unsigned long id, bool assert)
 {
@@ -72,10 +76,22 @@ static struct reset_control_ops ath79_reset_ops = {
 	.status = ath79_reset_status,
 };
 
+static int ath79_reset_restart_handler(struct notifier_block *nb,
+				unsigned long action, void *data)
+{
+	struct ath79_reset *ath79_reset =
+		container_of(nb, struct ath79_reset, restart_nb);
+
+	ath79_reset_assert(&ath79_reset->rcdev, FULL_CHIP_RESET);
+
+	return NOTIFY_DONE;
+}
+
 static int ath79_reset_probe(struct platform_device *pdev)
 {
 	struct ath79_reset *ath79_reset;
 	struct resource *res;
+	int err;
 
 	ath79_reset = devm_kzalloc(&pdev->dev,
 				sizeof(*ath79_reset), GFP_KERNEL);
@@ -96,13 +112,25 @@ static int ath79_reset_probe(struct platform_device *pdev)
 	ath79_reset->rcdev.of_reset_n_cells = 1;
 	ath79_reset->rcdev.nr_resets = 32;
 
-	return reset_controller_register(&ath79_reset->rcdev);
+	err = reset_controller_register(&ath79_reset->rcdev);
+	if (err)
+		return err;
+
+	ath79_reset->restart_nb.notifier_call = ath79_reset_restart_handler;
+	ath79_reset->restart_nb.priority = 128;
+
+	err = register_restart_handler(&ath79_reset->restart_nb);
+	if (err)
+		dev_warn(&pdev->dev, "Failed to register restart handler\n");
+
+	return 0;
 }
 
 static int ath79_reset_remove(struct platform_device *pdev)
 {
 	struct ath79_reset *ath79_reset = platform_get_drvdata(pdev);
 
+	unregister_restart_handler(&ath79_reset->restart_nb);
 	reset_controller_unregister(&ath79_reset->rcdev);
 
 	return 0;

include/dt-bindings/reset/hisi,hi6220-resets.h

+/**
+ * This header provides index for the reset controller
+ * based on hi6220 SoC.
+ */
+#ifndef _DT_BINDINGS_RESET_CONTROLLER_HI6220
+#define _DT_BINDINGS_RESET_CONTROLLER_HI6220
+
+#define PERIPH_RSTDIS0_MMC0             0x000
+#define PERIPH_RSTDIS0_MMC1             0x001
+#define PERIPH_RSTDIS0_MMC2             0x002
+#define PERIPH_RSTDIS0_NANDC            0x003
+#define PERIPH_RSTDIS0_USBOTG_BUS       0x004
+#define PERIPH_RSTDIS0_POR_PICOPHY      0x005
+#define PERIPH_RSTDIS0_USBOTG           0x006
+#define PERIPH_RSTDIS0_USBOTG_32K       0x007
+#define PERIPH_RSTDIS1_HIFI             0x100
+#define PERIPH_RSTDIS1_DIGACODEC        0x105
+#define PERIPH_RSTEN2_IPF               0x200
+#define PERIPH_RSTEN2_SOCP              0x201
+#define PERIPH_RSTEN2_DMAC              0x202
+#define PERIPH_RSTEN2_SECENG            0x203
+#define PERIPH_RSTEN2_ABB               0x204
+#define PERIPH_RSTEN2_HPM0              0x205
+#define PERIPH_RSTEN2_HPM1              0x206
+#define PERIPH_RSTEN2_HPM2              0x207
+#define PERIPH_RSTEN2_HPM3              0x208
+#define PERIPH_RSTEN3_CSSYS             0x300
+#define PERIPH_RSTEN3_I2C0              0x301
+#define PERIPH_RSTEN3_I2C1              0x302
+#define PERIPH_RSTEN3_I2C2              0x303
+#define PERIPH_RSTEN3_I2C3              0x304
+#define PERIPH_RSTEN3_UART1             0x305
+#define PERIPH_RSTEN3_UART2             0x306
+#define PERIPH_RSTEN3_UART3             0x307
+#define PERIPH_RSTEN3_UART4             0x308
+#define PERIPH_RSTEN3_SSP               0x309
+#define PERIPH_RSTEN3_PWM               0x30a
+#define PERIPH_RSTEN3_BLPWM             0x30b
+#define PERIPH_RSTEN3_TSENSOR           0x30c
+#define PERIPH_RSTEN3_DAPB              0x312
+#define PERIPH_RSTEN3_HKADC             0x313
+#define PERIPH_RSTEN3_CODEC_SSI         0x314
+#define PERIPH_RSTEN3_PMUSSI1           0x316
+#define PERIPH_RSTEN8_RS0               0x400
+#define PERIPH_RSTEN8_RS2               0x401
+#define PERIPH_RSTEN8_RS3               0x402
+#define PERIPH_RSTEN8_MS0               0x403
+#define PERIPH_RSTEN8_MS2               0x405
+#define PERIPH_RSTEN8_XG2RAM0           0x406
+#define PERIPH_RSTEN8_X2SRAM_TZMA       0x407
+#define PERIPH_RSTEN8_SRAM              0x408
+#define PERIPH_RSTEN8_HARQ              0x40a
+#define PERIPH_RSTEN8_DDRC              0x40c
+#define PERIPH_RSTEN8_DDRC_APB          0x40d
+#define PERIPH_RSTEN8_DDRPACK_APB       0x40e
+#define PERIPH_RSTEN8_DDRT              0x411
+#define PERIPH_RSDIST9_CARM_DAP         0x500
+#define PERIPH_RSDIST9_CARM_ATB         0x501
+#define PERIPH_RSDIST9_CARM_LBUS        0x502
+#define PERIPH_RSDIST9_CARM_POR         0x503
+#define PERIPH_RSDIST9_CARM_CORE        0x504
+#define PERIPH_RSDIST9_CARM_DBG         0x505
+#define PERIPH_RSDIST9_CARM_L2          0x506
+#define PERIPH_RSDIST9_CARM_SOCDBG      0x507
+#define PERIPH_RSDIST9_CARM_ETM         0x508
+
+#endif /*_DT_BINDINGS_RESET_CONTROLLER_HI6220*/