Add power management register operations to support reboot and poweroff.
Signed-off-by: Qing Zhang <[email protected]>
---
v7-v8:
delete unnecessary pointer casts
---
drivers/platform/mips/Kconfig | 6 ++++
drivers/platform/mips/Makefile | 1 +
drivers/platform/mips/ls2k-reset.c | 53 ++++++++++++++++++++++++++++++
3 files changed, 60 insertions(+)
create mode 100644 drivers/platform/mips/ls2k-reset.c
diff --git a/drivers/platform/mips/Kconfig b/drivers/platform/mips/Kconfig
index 8ac149173c64..d421e1482395 100644
--- a/drivers/platform/mips/Kconfig
+++ b/drivers/platform/mips/Kconfig
@@ -30,4 +30,10 @@ config RS780E_ACPI
help
Loongson RS780E PCH ACPI Controller driver.
+config LS2K_RESET
+ bool "Loongson-2K1000 Reset Controller"
+ depends on MACH_LOONGSON64 || COMPILE_TEST
+ help
+ Loongson-2K1000 Reset Controller driver.
+
endif # MIPS_PLATFORM_DEVICES
diff --git a/drivers/platform/mips/Makefile b/drivers/platform/mips/Makefile
index 178149098777..4c71444e453a 100644
--- a/drivers/platform/mips/Makefile
+++ b/drivers/platform/mips/Makefile
@@ -1,3 +1,4 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_CPU_HWMON) += cpu_hwmon.o
obj-$(CONFIG_RS780E_ACPI) += rs780e-acpi.o
+obj-$(CONFIG_LS2K_RESET) += ls2k-reset.o
diff --git a/drivers/platform/mips/ls2k-reset.c b/drivers/platform/mips/ls2k-reset.c
new file mode 100644
index 000000000000..b70e7b8a092c
--- /dev/null
+++ b/drivers/platform/mips/ls2k-reset.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021, Qing Zhang <[email protected]>
+ * Loongson-2K1000 reset support
+ */
+
+#include <linux/of_address.h>
+#include <linux/pm.h>
+#include <asm/reboot.h>
+
+#define PM1_STS 0x0c /* Power Management 1 Status Register */
+#define PM1_CNT 0x14 /* Power Management 1 Control Register */
+#define RST_CNT 0x30 /* Reset Control Register */
+
+static void __iomem *base;
+
+static void ls2k_restart(char *command)
+{
+ writel(0x1, base + RST_CNT);
+}
+
+static void ls2k_poweroff(void)
+{
+ /* Clear */
+ writel((readl(base + PM1_STS) & 0xffffffff), base + PM1_STS);
+ /* Sleep Enable | Soft Off*/
+ writel(GENMASK(12, 10) | BIT(13), base + PM1_CNT);
+}
+
+static int ls2k_reset_init(void)
+{
+ struct device_node *np;
+
+ np = of_find_compatible_node(NULL, NULL, "loongson,ls2k-pm");
+ if (!np) {
+ pr_info("Failed to get PM node\n");
+ return -ENODEV;
+ }
+
+ base = of_iomap(np, 0);
+ if (!base) {
+ pr_info("Failed to map PM register base address\n");
+ return -ENOMEM;
+ }
+
+ _machine_restart = ls2k_restart;
+ pm_power_off = ls2k_poweroff;
+
+ of_node_put(np);
+ return 0;
+}
+
+arch_initcall(ls2k_reset_init);
--
2.31.0
The module is now supported, enable it.
Signed-off-by: Qing Zhang <[email protected]>
---
v7-v8:
No change
---
arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi b/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
index 5747f171de29..6004400bb689 100644
--- a/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
+++ b/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
@@ -52,6 +52,11 @@ package0: bus@10000000 {
0 0x40000000 0 0x40000000 0 0x40000000
0xfe 0x00000000 0xfe 0x00000000 0 0x40000000>;
+ pm: power-controller@1fe07000 {
+ compatible = "loongson,ls2k-pm";
+ reg = <0 0x1fe07000 0 0x422>;
+ };
+
liointc0: interrupt-controller@1fe11400 {
compatible = "loongson,liointc-2.0";
reg = <0 0x1fe11400 0 0x40>,
--
2.31.0
Switch the DT binding to a YAML schema to enable the DT validation.
Signed-off-by: Qing Zhang <[email protected]>
---
v7-v8:
No change
---
.../bindings/mips/loongson/ls2k-reset.yaml | 38 +++++++++++++++++++
1 file changed, 38 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mips/loongson/ls2k-reset.yaml
diff --git a/Documentation/devicetree/bindings/mips/loongson/ls2k-reset.yaml b/Documentation/devicetree/bindings/mips/loongson/ls2k-reset.yaml
new file mode 100644
index 000000000000..6016ea756ccd
--- /dev/null
+++ b/Documentation/devicetree/bindings/mips/loongson/ls2k-reset.yaml
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/mips/loongson/ls2k-reset.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Loongson 2K1000 PM Controller
+
+maintainers:
+ - Qing Zhang <[email protected]>
+
+description: |
+ This controller can be found in Loongson-2K1000 Soc systems.
+
+properties:
+ compatible:
+ const: loongson,ls2k-pm
+
+ reg:
+ maxItems: 1
+
+required:
+ - compatible
+ - reg
+
+additionalProperties: false
+
+examples:
+ - |
+ bus {
+ #address-cells = <2>;
+ #size-cells = <2>;
+ pm: power-controller@1fe07000 {
+ compatible = "loongson,ls2k-pm";
+ reg = <0 0x1fe07000 0 0x422>;
+ };
+ };
+...
--
2.31.0
On Thu, 01 Jul 2021 21:14:00 +0800, Qing Zhang wrote:
> Switch the DT binding to a YAML schema to enable the DT validation.
>
> Signed-off-by: Qing Zhang <[email protected]>
> ---
>
> v7-v8:
> No change
> ---
> .../bindings/mips/loongson/ls2k-reset.yaml | 38 +++++++++++++++++++
> 1 file changed, 38 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mips/loongson/ls2k-reset.yaml
>
My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):
yamllint warnings/errors:
dtschema/dtc warnings/errors:
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/mips/loongson/ls2k-reset.example.dt.yaml: power-controller@1fe07000: '#power-domain-cells' is a required property
From schema: /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/power/power-domain.yaml
\ndoc reference errors (make refcheckdocs):
See https://patchwork.ozlabs.org/patch/1499533
This check can fail if there are any dependencies. The base for a patch
series is generally the most recent rc1.
If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:
pip3 install dtschema --upgrade
Please check and re-submit.