| Message ID | 1515449444-5274-1-git-send-email-jollys@xilinx.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, 2018-01-08 at 14:10 -0800, Jolly Shah wrote: > Add ZynqMP PM driver. PM driver provides power management > support for ZynqMP. > > Signed-off-by: Jolly Shah <jollys@xilinx.com> > Signed-off-by: Rajan Vaja <rajanv@xilinx.com> > --- > .../bindings/soc/xilinx/xlnx,zynqmp-pm.txt | 15 ++ The patch should be split into two: one is for dt-bindings part and the other is for driver part. Where dt-binding part should require additionally to send to Rob and Cc. devicetree@vger.kernel.org. > drivers/soc/Kconfig | 1 + > drivers/soc/Makefile | 1 + > drivers/soc/xilinx/Kconfig | 4 + > drivers/soc/xilinx/Makefile | 4 + > drivers/soc/xilinx/zynqmp/Kconfig | 15 ++ > drivers/soc/xilinx/zynqmp/Makefile | 1 + > drivers/soc/xilinx/zynqmp/pm.c | 265 +++++++++++++++++++++ > 8 files changed, 306 insertions(+) > create mode 100644 Documentation/devicetree/bindings/soc/xilinx/xlnx,zynqmp-pm.txt > create mode 100644 drivers/soc/xilinx/Kconfig > create mode 100644 drivers/soc/xilinx/Makefile > create mode 100644 drivers/soc/xilinx/zynqmp/Kconfig > create mode 100644 drivers/soc/xilinx/zynqmp/Makefile > create mode 100644 drivers/soc/xilinx/zynqmp/pm.c > > diff --git a/Documentation/devicetree/bindings/soc/xilinx/xlnx,zynqmp-pm.txt b/Documentation/devicetree/bindings/soc/xilinx/xlnx,zynqmp-pm.txt > new file mode 100644 > index 0000000..9cfb40d > --- /dev/null > +++ b/Documentation/devicetree/bindings/soc/xilinx/xlnx,zynqmp-pm.txt > @@ -0,0 +1,15 @@ > +Xilinx Zynq MPSoC Power Management Device Tree Bindings > + > +The zynqmp-pm node describes the power management configurations. > + > +Required properties: > + - compatible : Must contain: "xlnx,zynqmp-pm" > + - interrupt-parent : Interrupt controller the interrupt is routed through > + - interrupts : Interrupt specifier > + > +Examples: > + zynqmp-firmware { > + compatible = "xlnx,zynqmp-pm"; > + interrupt-parent = <&gic>; > + interrupts = <0 35 4>; > + }; > diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig > index fc9e980..c07b4a8 100644 > --- a/drivers/soc/Kconfig > +++ b/drivers/soc/Kconfig > @@ -16,6 +16,7 @@ source "drivers/soc/tegra/Kconfig" > source "drivers/soc/ti/Kconfig" > source "drivers/soc/ux500/Kconfig" > source "drivers/soc/versatile/Kconfig" > +source "drivers/soc/xilinx/Kconfig" > source "drivers/soc/zte/Kconfig" > > endmenu > diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile > index deecb16..abb019a 100644 > --- a/drivers/soc/Makefile > +++ b/drivers/soc/Makefile > @@ -19,6 +19,7 @@ obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/ > obj-$(CONFIG_SOC_SAMSUNG) += samsung/ > obj-$(CONFIG_ARCH_SUNXI) += sunxi/ > obj-$(CONFIG_ARCH_TEGRA) += tegra/ > +obj-$(CONFIG_ARCH_ZYNQMP) += xilinx/ > obj-$(CONFIG_SOC_TI) += ti/ > obj-$(CONFIG_ARCH_U8500) += ux500/ > obj-$(CONFIG_PLAT_VERSATILE) += versatile/ > diff --git a/drivers/soc/xilinx/Kconfig b/drivers/soc/xilinx/Kconfig > new file mode 100644 > index 0000000..190add7 > --- /dev/null > +++ b/drivers/soc/xilinx/Kconfig > @@ -0,0 +1,4 @@ > +# SPDX-License-Identifier: GPL-2.0+ > +# Kconfig for Xilinx SoCs > + > +source "drivers/soc/xilinx/zynqmp/Kconfig" > diff --git a/drivers/soc/xilinx/Makefile b/drivers/soc/xilinx/Makefile > new file mode 100644 > index 0000000..bc9d560 > --- /dev/null > +++ b/drivers/soc/xilinx/Makefile > @@ -0,0 +1,4 @@ > +# SPDX-License-Identifier: GPL-2.0+ > +# Makefile for Xilinx SoCs > + > +obj-$(CONFIG_ARCH_ZYNQMP) += zynqmp/ > diff --git a/drivers/soc/xilinx/zynqmp/Kconfig b/drivers/soc/xilinx/zynqmp/Kconfig > new file mode 100644 > index 0000000..d3c784d > --- /dev/null > +++ b/drivers/soc/xilinx/zynqmp/Kconfig > @@ -0,0 +1,15 @@ > +# SPDX-License-Identifier: GPL-2.0+ > +# Kconfig for Xilinx zynqmp SoC > +# > +menu "Zynq MPSoC SoC Drivers" > + depends on ARCH_ZYNQMP > + > + > +config ZYNQMP_PM > + bool "Enable Xilinx Zynq MPSoC Power Management" > + depends on PM > + help > + Say yes to enable power management support for > + ZyqnMP SoC. In doubt, say N. > + > +endmenu > diff --git a/drivers/soc/xilinx/zynqmp/Makefile b/drivers/soc/xilinx/zynqmp/Makefile > new file mode 100644 > index 0000000..98034f7 > --- /dev/null > +++ b/drivers/soc/xilinx/zynqmp/Makefile > @@ -0,0 +1 @@ > +obj-$(CONFIG_ZYNQMP_PM) += pm.o > diff --git a/drivers/soc/xilinx/zynqmp/pm.c b/drivers/soc/xilinx/zynqmp/pm.c > new file mode 100644 > index 0000000..7178fb5 > --- /dev/null > +++ b/drivers/soc/xilinx/zynqmp/pm.c > @@ -0,0 +1,265 @@ > +/* > + * Xilinx Zynq MPSoC Power Management > + * > + * Copyright (C) 2014-2017 Xilinx, Inc. should include 2018 ? > + * > + * Davorin Mista <davorin.mista@aggios.com> > + * Jolly Shah <jollys@xilinx.com> > + * Rajan Vaja <rajanv@xilinx.com> > + * > + * SPDX-License-Identifier: GPL-2.0+ > + */ > + > +#include <linux/compiler.h> > +#include <linux/arm-smccc.h> > +#include <linux/of.h> > +#include <linux/init.h> > +#include <linux/module.h> > +#include <linux/slab.h> > +#include <linux/interrupt.h> > +#include <linux/uaccess.h> > +#include <linux/platform_device.h> > +#include <linux/debugfs.h> > +#include <linux/reboot.h> > +#include <linux/suspend.h> > +#include <linux/firmware/xilinx/zynqmp/firmware.h> > + > +#define DRIVER_NAME "zynqmp_pm" > + > +/** > + * struct zynqmp_pm_work_struct - Wrapper for struct work_struct > + * @callback_work: Work structure > + * @args: Callback arguments > + */ > +struct zynqmp_pm_work_struct { > + struct work_struct callback_work; > + u32 args[CB_ARG_CNT]; > +}; > + > +static struct zynqmp_pm_work_struct *zynqmp_pm_init_suspend_work; > + > +enum pm_suspend_mode { > + PM_SUSPEND_MODE_STD, > + PM_SUSPEND_MODE_POWER_OFF, > +}; > + > +#define PM_SUSPEND_MODE_FIRST PM_SUSPEND_MODE_STD > + > +static const char *const suspend_modes[] = { > + [PM_SUSPEND_MODE_STD] = "standard", > + [PM_SUSPEND_MODE_POWER_OFF] = "power-off", > +}; > + > +static enum pm_suspend_mode suspend_mode = PM_SUSPEND_MODE_STD; > + > +enum pm_api_cb_id { > + PM_INIT_SUSPEND_CB = 30, > + PM_ACKNOWLEDGE_CB, > + PM_NOTIFY_CB, > +}; > + > +static irqreturn_t zynqmp_pm_isr(int irq, void *data) > +{ > + u32 payload[CB_PAYLOAD_SIZE]; > + const struct zynqmp_eemi_ops *eemi_ops = get_eemi_ops(); > + > + if (!eemi_ops || !eemi_ops->get_callback_data) > + return IRQ_NONE; > + > + eemi_ops->get_callback_data(payload); > + > + if (!payload[0]) > + return IRQ_NONE; > + > + /* First element is callback API ID, others are callback arguments */ > + if (payload[0] == PM_INIT_SUSPEND_CB) { > + if (work_pending(&zynqmp_pm_init_suspend_work->callback_work)) > + goto done; > + > + /* Copy callback arguments into work's structure */ > + memcpy(zynqmp_pm_init_suspend_work->args, &payload[1], > + sizeof(zynqmp_pm_init_suspend_work->args)); > + > + queue_work(system_unbound_wq, > + &zynqmp_pm_init_suspend_work->callback_work); > + } > + > +done: > + return IRQ_HANDLED; > +} > + > +static const struct of_device_id pm_of_match[] = { > + { .compatible = "xlnx,zynqmp-pm", }, > + { /* end of table */ }, > +}; > + > +MODULE_DEVICE_TABLE(of, pm_of_match); > + > +/** > + * zynqmp_pm_init_suspend_work_fn - Initialize suspend > + * @work: Pointer to work_struct > + * > + * Bottom-half of PM callback IRQ handler. > + */ > +static void zynqmp_pm_init_suspend_work_fn(struct work_struct *work) > +{ > + struct zynqmp_pm_work_struct *pm_work = > + container_of(work, struct zynqmp_pm_work_struct, callback_work); > + > + if (pm_work->args[0] == ZYNQMP_PM_SUSPEND_REASON_SYSTEM_SHUTDOWN) { > + orderly_poweroff(true); > + } else if (pm_work->args[0] == > + ZYNQMP_PM_SUSPEND_REASON_POWER_UNIT_REQUEST) { > + pm_suspend(PM_SUSPEND_MEM); > + } else { > + pr_err("%s Unsupported InitSuspendCb reason code %d.\n" > + , __func__, pm_work->args[0]); > + } > +} > + > +static ssize_t suspend_mode_show(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + char *s = buf; > + int md; > + > + for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++) > + if (suspend_modes[md]) { > + if (md == suspend_mode) > + s += sprintf(s, "[%s] ", suspend_modes[md]); > + else > + s += sprintf(s, "%s ", suspend_modes[md]); > + } > + > + /* Convert last space to newline */ > + if (s != buf) > + *(s - 1) = '\n'; > + return (s - buf); > +} > + > +static ssize_t suspend_mode_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + int md, ret = -EINVAL; > + const struct zynqmp_eemi_ops *eemi_ops = get_eemi_ops(); > + > + if (!eemi_ops || !eemi_ops->set_suspend_mode) > + return ret; > + > + for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++) > + if (suspend_modes[md] && > + sysfs_streq(suspend_modes[md], buf)) { > + ret = 0; > + break; > + } > + > + if (!ret && md != suspend_mode) { > + ret = eemi_ops->set_suspend_mode(md); > + if (likely(!ret)) > + suspend_mode = md; > + } > + > + return ret ? ret : count; > +} > + > +static DEVICE_ATTR_RW(suspend_mode); > + > +/** > + * zynqmp_pm_sysfs_init - Initialize PM driver sysfs interface > + * @dev: Pointer to device structure > + * > + * Return: 0 on success, negative error code otherwise > + */ > +static int zynqmp_pm_sysfs_init(struct device *dev) > +{ > + return sysfs_create_file(&dev->kobj, &dev_attr_suspend_mode.attr); > +} > + > +/** > + * zynqmp_pm_probe - Probe existence of the PMU Firmware > + * and initialize debugfs interface > + * > + * @pdev: Pointer to the platform_device structure > + * > + * Return: Returns 0 on success > + * Negative error code otherwise > + */ > +static int zynqmp_pm_probe(struct platform_device *pdev) > +{ > + int ret, irq; > + u32 pm_api_version; > + const struct zynqmp_eemi_ops *eemi_ops = get_eemi_ops(); > + > + if (!eemi_ops || !eemi_ops->get_api_version) > + return -ENXIO; > + > + eemi_ops->get_api_version(&pm_api_version); > + > + /* Check PM API version number */ > + if (pm_api_version != ZYNQMP_PM_VERSION) > + return -ENODEV; > + > + irq = platform_get_irq(pdev, 0); > + if (irq <= 0) > + return -ENXIO; > + > + ret = request_irq(irq, zynqmp_pm_isr, IRQF_SHARED, DRIVER_NAME, pdev); > + if (ret) { > + dev_err(&pdev->dev, "request_irq '%d' failed with %d\n", > + irq, ret); > + return ret; > + } how about use devm_request_irq to simplify error path? > + > + zynqmp_pm_init_suspend_work = > + devm_kzalloc(&pdev->dev, sizeof(struct zynqmp_pm_work_struct), > + GFP_KERNEL); > + if (!zynqmp_pm_init_suspend_work) { > + ret = -ENOMEM; > + goto error; > + } > + > + INIT_WORK(&zynqmp_pm_init_suspend_work->callback_work, > + zynqmp_pm_init_suspend_work_fn); > + > + ret = zynqmp_pm_sysfs_init(&pdev->dev); > + if (ret) { > + dev_err(&pdev->dev, "unable to initialize sysfs interface\n"); > + goto error; > + } > + > + dev_info(&pdev->dev, "Power management API v%d.%d\n", > + ZYNQMP_PM_VERSION_MAJOR, ZYNQMP_PM_VERSION_MINOR); > + > + return 0; > + > +error: > + free_irq(irq, 0); > + return ret; > +} > + > +static struct platform_driver zynqmp_pm_platform_driver = { > + .probe = zynqmp_pm_probe, > + .driver = { > + .name = DRIVER_NAME, > + .of_match_table = pm_of_match, > + }, > +}; > +builtin_platform_driver(zynqmp_pm_platform_driver); > + > +/** > + * zynqmp_pm_init - Notify PM firmware that initialization is completed > + * > + * Return: Status returned from the PM firmware > + */ > +static int __init zynqmp_pm_init(void) > +{ > + const struct zynqmp_eemi_ops *eemi_ops = get_eemi_ops(); > + > + if (!eemi_ops || !eemi_ops->init_finalize) > + return -ENXIO; > + > + return eemi_ops->init_finalize(); > +} > + > +late_initcall_sync(zynqmp_pm_init);
Thanks Sean for review, > -----Original Message----- > From: Sean Wang [mailto:sean.wang@mediatek.com] > Sent: Monday, January 08, 2018 7:10 PM > To: Jolly Shah <JOLLYS@xilinx.com> > Cc: matthias.bgg@gmail.com; andy.gross@linaro.org; shawnguo@kernel.org; > geert+renesas@glider.be; bjorn.andersson@linaro.org; > m.szyprowski@samsung.com; michal.simek@xilinx.com; linux-arm- > kernel@lists.infradead.org; linux-kernel@vger.kernel.org; Jolly Shah > <JOLLYS@xilinx.com>; Rajan Vaja <RAJANV@xilinx.com> > Subject: Re: [RFC PATCH] drivers: soc: xilinx: Add ZynqMP PM driver > > On Mon, 2018-01-08 at 14:10 -0800, Jolly Shah wrote: > > Add ZynqMP PM driver. PM driver provides power management support for > > ZynqMP. > > > > Signed-off-by: Jolly Shah <jollys@xilinx.com> > > Signed-off-by: Rajan Vaja <rajanv@xilinx.com> > > --- > > .../bindings/soc/xilinx/xlnx,zynqmp-pm.txt | 15 ++ > > > The patch should be split into two: one is for dt-bindings part and the other is for > driver part. Where dt-binding part should require additionally to send to Rob and > Cc. devicetree@vger.kernel.org. > Sure. Will do it in next version. > > diff --git a/drivers/soc/xilinx/zynqmp/Makefile > > b/drivers/soc/xilinx/zynqmp/Makefile > > new file mode 100644 > > index 0000000..98034f7 > > --- /dev/null > > +++ b/drivers/soc/xilinx/zynqmp/Makefile > > @@ -0,0 +1 @@ > > +obj-$(CONFIG_ZYNQMP_PM) += pm.o > > diff --git a/drivers/soc/xilinx/zynqmp/pm.c > > b/drivers/soc/xilinx/zynqmp/pm.c new file mode 100644 index > > 0000000..7178fb5 > > --- /dev/null > > +++ b/drivers/soc/xilinx/zynqmp/pm.c > > @@ -0,0 +1,265 @@ > > +/* > > + * Xilinx Zynq MPSoC Power Management > > + * > > + * Copyright (C) 2014-2017 Xilinx, Inc. > > should include 2018 ? > Will fix in next version > > + if (!eemi_ops || !eemi_ops->get_api_version) > > + return -ENXIO; > > + > > + eemi_ops->get_api_version(&pm_api_version); > > + > > + /* Check PM API version number */ > > + if (pm_api_version != ZYNQMP_PM_VERSION) > > + return -ENODEV; > > + > > + irq = platform_get_irq(pdev, 0); > > + if (irq <= 0) > > + return -ENXIO; > > + > > + ret = request_irq(irq, zynqmp_pm_isr, IRQF_SHARED, DRIVER_NAME, > pdev); > > + if (ret) { > > + dev_err(&pdev->dev, "request_irq '%d' failed with %d\n", > > + irq, ret); > > + return ret; > > + } > > > how about use devm_request_irq to simplify error path? Will change in next version Thanks, Jolly Shah
diff --git a/Documentation/devicetree/bindings/soc/xilinx/xlnx,zynqmp-pm.txt b/Documentation/devicetree/bindings/soc/xilinx/xlnx,zynqmp-pm.txt new file mode 100644 index 0000000..9cfb40d --- /dev/null +++ b/Documentation/devicetree/bindings/soc/xilinx/xlnx,zynqmp-pm.txt @@ -0,0 +1,15 @@ +Xilinx Zynq MPSoC Power Management Device Tree Bindings + +The zynqmp-pm node describes the power management configurations. + +Required properties: + - compatible : Must contain: "xlnx,zynqmp-pm" + - interrupt-parent : Interrupt controller the interrupt is routed through + - interrupts : Interrupt specifier + +Examples: + zynqmp-firmware { + compatible = "xlnx,zynqmp-pm"; + interrupt-parent = <&gic>; + interrupts = <0 35 4>; + }; diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig index fc9e980..c07b4a8 100644 --- a/drivers/soc/Kconfig +++ b/drivers/soc/Kconfig @@ -16,6 +16,7 @@ source "drivers/soc/tegra/Kconfig" source "drivers/soc/ti/Kconfig" source "drivers/soc/ux500/Kconfig" source "drivers/soc/versatile/Kconfig" +source "drivers/soc/xilinx/Kconfig" source "drivers/soc/zte/Kconfig" endmenu diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile index deecb16..abb019a 100644 --- a/drivers/soc/Makefile +++ b/drivers/soc/Makefile @@ -19,6 +19,7 @@ obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/ obj-$(CONFIG_SOC_SAMSUNG) += samsung/ obj-$(CONFIG_ARCH_SUNXI) += sunxi/ obj-$(CONFIG_ARCH_TEGRA) += tegra/ +obj-$(CONFIG_ARCH_ZYNQMP) += xilinx/ obj-$(CONFIG_SOC_TI) += ti/ obj-$(CONFIG_ARCH_U8500) += ux500/ obj-$(CONFIG_PLAT_VERSATILE) += versatile/ diff --git a/drivers/soc/xilinx/Kconfig b/drivers/soc/xilinx/Kconfig new file mode 100644 index 0000000..190add7 --- /dev/null +++ b/drivers/soc/xilinx/Kconfig @@ -0,0 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0+ +# Kconfig for Xilinx SoCs + +source "drivers/soc/xilinx/zynqmp/Kconfig" diff --git a/drivers/soc/xilinx/Makefile b/drivers/soc/xilinx/Makefile new file mode 100644 index 0000000..bc9d560 --- /dev/null +++ b/drivers/soc/xilinx/Makefile @@ -0,0 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0+ +# Makefile for Xilinx SoCs + +obj-$(CONFIG_ARCH_ZYNQMP) += zynqmp/ diff --git a/drivers/soc/xilinx/zynqmp/Kconfig b/drivers/soc/xilinx/zynqmp/Kconfig new file mode 100644 index 0000000..d3c784d --- /dev/null +++ b/drivers/soc/xilinx/zynqmp/Kconfig @@ -0,0 +1,15 @@ +# SPDX-License-Identifier: GPL-2.0+ +# Kconfig for Xilinx zynqmp SoC +# +menu "Zynq MPSoC SoC Drivers" + depends on ARCH_ZYNQMP + + +config ZYNQMP_PM + bool "Enable Xilinx Zynq MPSoC Power Management" + depends on PM + help + Say yes to enable power management support for + ZyqnMP SoC. In doubt, say N. + +endmenu diff --git a/drivers/soc/xilinx/zynqmp/Makefile b/drivers/soc/xilinx/zynqmp/Makefile new file mode 100644 index 0000000..98034f7 --- /dev/null +++ b/drivers/soc/xilinx/zynqmp/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_ZYNQMP_PM) += pm.o diff --git a/drivers/soc/xilinx/zynqmp/pm.c b/drivers/soc/xilinx/zynqmp/pm.c new file mode 100644 index 0000000..7178fb5 --- /dev/null +++ b/drivers/soc/xilinx/zynqmp/pm.c @@ -0,0 +1,265 @@ +/* + * Xilinx Zynq MPSoC Power Management + * + * Copyright (C) 2014-2017 Xilinx, Inc. + * + * Davorin Mista <davorin.mista@aggios.com> + * Jolly Shah <jollys@xilinx.com> + * Rajan Vaja <rajanv@xilinx.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <linux/compiler.h> +#include <linux/arm-smccc.h> +#include <linux/of.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/uaccess.h> +#include <linux/platform_device.h> +#include <linux/debugfs.h> +#include <linux/reboot.h> +#include <linux/suspend.h> +#include <linux/firmware/xilinx/zynqmp/firmware.h> + +#define DRIVER_NAME "zynqmp_pm" + +/** + * struct zynqmp_pm_work_struct - Wrapper for struct work_struct + * @callback_work: Work structure + * @args: Callback arguments + */ +struct zynqmp_pm_work_struct { + struct work_struct callback_work; + u32 args[CB_ARG_CNT]; +}; + +static struct zynqmp_pm_work_struct *zynqmp_pm_init_suspend_work; + +enum pm_suspend_mode { + PM_SUSPEND_MODE_STD, + PM_SUSPEND_MODE_POWER_OFF, +}; + +#define PM_SUSPEND_MODE_FIRST PM_SUSPEND_MODE_STD + +static const char *const suspend_modes[] = { + [PM_SUSPEND_MODE_STD] = "standard", + [PM_SUSPEND_MODE_POWER_OFF] = "power-off", +}; + +static enum pm_suspend_mode suspend_mode = PM_SUSPEND_MODE_STD; + +enum pm_api_cb_id { + PM_INIT_SUSPEND_CB = 30, + PM_ACKNOWLEDGE_CB, + PM_NOTIFY_CB, +}; + +static irqreturn_t zynqmp_pm_isr(int irq, void *data) +{ + u32 payload[CB_PAYLOAD_SIZE]; + const struct zynqmp_eemi_ops *eemi_ops = get_eemi_ops(); + + if (!eemi_ops || !eemi_ops->get_callback_data) + return IRQ_NONE; + + eemi_ops->get_callback_data(payload); + + if (!payload[0]) + return IRQ_NONE; + + /* First element is callback API ID, others are callback arguments */ + if (payload[0] == PM_INIT_SUSPEND_CB) { + if (work_pending(&zynqmp_pm_init_suspend_work->callback_work)) + goto done; + + /* Copy callback arguments into work's structure */ + memcpy(zynqmp_pm_init_suspend_work->args, &payload[1], + sizeof(zynqmp_pm_init_suspend_work->args)); + + queue_work(system_unbound_wq, + &zynqmp_pm_init_suspend_work->callback_work); + } + +done: + return IRQ_HANDLED; +} + +static const struct of_device_id pm_of_match[] = { + { .compatible = "xlnx,zynqmp-pm", }, + { /* end of table */ }, +}; + +MODULE_DEVICE_TABLE(of, pm_of_match); + +/** + * zynqmp_pm_init_suspend_work_fn - Initialize suspend + * @work: Pointer to work_struct + * + * Bottom-half of PM callback IRQ handler. + */ +static void zynqmp_pm_init_suspend_work_fn(struct work_struct *work) +{ + struct zynqmp_pm_work_struct *pm_work = + container_of(work, struct zynqmp_pm_work_struct, callback_work); + + if (pm_work->args[0] == ZYNQMP_PM_SUSPEND_REASON_SYSTEM_SHUTDOWN) { + orderly_poweroff(true); + } else if (pm_work->args[0] == + ZYNQMP_PM_SUSPEND_REASON_POWER_UNIT_REQUEST) { + pm_suspend(PM_SUSPEND_MEM); + } else { + pr_err("%s Unsupported InitSuspendCb reason code %d.\n" + , __func__, pm_work->args[0]); + } +} + +static ssize_t suspend_mode_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + char *s = buf; + int md; + + for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++) + if (suspend_modes[md]) { + if (md == suspend_mode) + s += sprintf(s, "[%s] ", suspend_modes[md]); + else + s += sprintf(s, "%s ", suspend_modes[md]); + } + + /* Convert last space to newline */ + if (s != buf) + *(s - 1) = '\n'; + return (s - buf); +} + +static ssize_t suspend_mode_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int md, ret = -EINVAL; + const struct zynqmp_eemi_ops *eemi_ops = get_eemi_ops(); + + if (!eemi_ops || !eemi_ops->set_suspend_mode) + return ret; + + for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++) + if (suspend_modes[md] && + sysfs_streq(suspend_modes[md], buf)) { + ret = 0; + break; + } + + if (!ret && md != suspend_mode) { + ret = eemi_ops->set_suspend_mode(md); + if (likely(!ret)) + suspend_mode = md; + } + + return ret ? ret : count; +} + +static DEVICE_ATTR_RW(suspend_mode); + +/** + * zynqmp_pm_sysfs_init - Initialize PM driver sysfs interface + * @dev: Pointer to device structure + * + * Return: 0 on success, negative error code otherwise + */ +static int zynqmp_pm_sysfs_init(struct device *dev) +{ + return sysfs_create_file(&dev->kobj, &dev_attr_suspend_mode.attr); +} + +/** + * zynqmp_pm_probe - Probe existence of the PMU Firmware + * and initialize debugfs interface + * + * @pdev: Pointer to the platform_device structure + * + * Return: Returns 0 on success + * Negative error code otherwise + */ +static int zynqmp_pm_probe(struct platform_device *pdev) +{ + int ret, irq; + u32 pm_api_version; + const struct zynqmp_eemi_ops *eemi_ops = get_eemi_ops(); + + if (!eemi_ops || !eemi_ops->get_api_version) + return -ENXIO; + + eemi_ops->get_api_version(&pm_api_version); + + /* Check PM API version number */ + if (pm_api_version != ZYNQMP_PM_VERSION) + return -ENODEV; + + irq = platform_get_irq(pdev, 0); + if (irq <= 0) + return -ENXIO; + + ret = request_irq(irq, zynqmp_pm_isr, IRQF_SHARED, DRIVER_NAME, pdev); + if (ret) { + dev_err(&pdev->dev, "request_irq '%d' failed with %d\n", + irq, ret); + return ret; + } + + zynqmp_pm_init_suspend_work = + devm_kzalloc(&pdev->dev, sizeof(struct zynqmp_pm_work_struct), + GFP_KERNEL); + if (!zynqmp_pm_init_suspend_work) { + ret = -ENOMEM; + goto error; + } + + INIT_WORK(&zynqmp_pm_init_suspend_work->callback_work, + zynqmp_pm_init_suspend_work_fn); + + ret = zynqmp_pm_sysfs_init(&pdev->dev); + if (ret) { + dev_err(&pdev->dev, "unable to initialize sysfs interface\n"); + goto error; + } + + dev_info(&pdev->dev, "Power management API v%d.%d\n", + ZYNQMP_PM_VERSION_MAJOR, ZYNQMP_PM_VERSION_MINOR); + + return 0; + +error: + free_irq(irq, 0); + return ret; +} + +static struct platform_driver zynqmp_pm_platform_driver = { + .probe = zynqmp_pm_probe, + .driver = { + .name = DRIVER_NAME, + .of_match_table = pm_of_match, + }, +}; +builtin_platform_driver(zynqmp_pm_platform_driver); + +/** + * zynqmp_pm_init - Notify PM firmware that initialization is completed + * + * Return: Status returned from the PM firmware + */ +static int __init zynqmp_pm_init(void) +{ + const struct zynqmp_eemi_ops *eemi_ops = get_eemi_ops(); + + if (!eemi_ops || !eemi_ops->init_finalize) + return -ENXIO; + + return eemi_ops->init_finalize(); +} + +late_initcall_sync(zynqmp_pm_init);