drivers: soc: xilinx: Add ZynqMP PM driver

Add ZynqMP PM driver. PM driver provides power management
support for ZynqMP.

Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Signed-off-by: Jolly Shah <jolly.shah@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/drivers/soc/xilinx/Kconfig b/drivers/soc/xilinx/Kconfig
index 687c8f3..5025e0e 100644 (file)
--- a/drivers/soc/xilinx/Kconfig
+++ b/drivers/soc/xilinx/Kconfig
@@ -17,4 +17,15 @@ config XILINX_VCU
          To compile this driver as a module, choose M here: the
          module will be called xlnx_vcu.
 
+config ZYNQMP_POWER
+       bool "Enable Xilinx Zynq MPSoC Power Management driver"
+       depends on PM && ARCH_ZYNQMP
+       default y
+       help
+         Say yes to enable power management support for ZyqnMP SoC.
+         This driver uses firmware driver as an interface for power
+         management request to firmware. It registers isr to handle
+         power management callbacks from firmware.
+         If in doubt, say N.
+
 endmenu

diff --git a/drivers/soc/xilinx/Makefile b/drivers/soc/xilinx/Makefile
index dee8fd5..428b9db 100644 (file)
--- a/drivers/soc/xilinx/Makefile
+++ b/drivers/soc/xilinx/Makefile
@@ -1,2 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_XILINX_VCU)       += xlnx_vcu.o
+obj-$(CONFIG_ZYNQMP_POWER)     += zynqmp_power.o

diff --git a/drivers/soc/xilinx/zynqmp_power.c b/drivers/soc/xilinx/zynqmp_power.c
new file mode 100644 (file)
index 0000000..771cb59
--- /dev/null
+++ b/drivers/soc/xilinx/zynqmp_power.c
@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx Zynq MPSoC Power Management
+ *
+ *  Copyright (C) 2014-2018 Xilinx, Inc.
+ *
+ *  Davorin Mista <davorin.mista@aggios.com>
+ *  Jolly Shah <jollys@xilinx.com>
+ *  Rajan Vaja <rajan.vaja@xilinx.com>
+ */
+
+#include <linux/mailbox_client.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/suspend.h>
+
+#include <linux/firmware/xlnx-zynqmp.h>
+
+enum pm_suspend_mode {
+       PM_SUSPEND_MODE_FIRST = 0,
+       PM_SUSPEND_MODE_STD = PM_SUSPEND_MODE_FIRST,
+       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 void zynqmp_pm_get_callback_data(u32 *buf)
+{
+       zynqmp_pm_invoke_fn(GET_CALLBACK_DATA, 0, 0, 0, 0, buf);
+}
+
+static irqreturn_t zynqmp_pm_isr(int irq, void *data)
+{
+       u32 payload[CB_PAYLOAD_SIZE];
+
+       zynqmp_pm_get_callback_data(payload);
+
+       /* First element is callback API ID, others are callback arguments */
+       if (payload[0] == PM_INIT_SUSPEND_CB) {
+               switch (payload[1]) {
+               case SUSPEND_SYSTEM_SHUTDOWN:
+                       orderly_poweroff(true);
+                       break;
+               case SUSPEND_POWER_REQUEST:
+                       pm_suspend(PM_SUSPEND_MEM);
+                       break;
+               default:
+                       pr_err("%s Unsupported InitSuspendCb reason "
+                               "code %d\n", __func__, payload[1]);
+               }
+       }
+
+       return IRQ_HANDLED;
+}
+
+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 = zynqmp_pm_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);
+
+static int zynqmp_pm_probe(struct platform_device *pdev)
+{
+       int ret, irq;
+       u32 pm_api_version;
+
+       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+       if (!eemi_ops || !eemi_ops->get_api_version || !eemi_ops->init_finalize)
+               return -ENXIO;
+
+       eemi_ops->init_finalize();
+       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 = devm_request_threaded_irq(&pdev->dev, irq, NULL, zynqmp_pm_isr,
+                                       IRQF_NO_SUSPEND | IRQF_ONESHOT,
+                                       dev_name(&pdev->dev), &pdev->dev);
+       if (ret) {
+               dev_err(&pdev->dev, "devm_request_threaded_irq '%d' failed "
+                       "with %d\n", irq, ret);
+               return ret;
+       }
+
+       ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
+       if (ret) {
+               dev_err(&pdev->dev, "unable to create sysfs interface\n");
+               return ret;
+       }
+
+       return 0;
+}
+
+static int zynqmp_pm_remove(struct platform_device *pdev)
+{
+       sysfs_remove_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
+
+       return 0;
+}
+
+static const struct of_device_id pm_of_match[] = {
+       { .compatible = "xlnx,zynqmp-power", },
+       { /* end of table */ },
+};
+MODULE_DEVICE_TABLE(of, pm_of_match);
+
+static struct platform_driver zynqmp_pm_platform_driver = {
+       .probe = zynqmp_pm_probe,
+       .remove = zynqmp_pm_remove,
+       .driver = {
+               .name = "zynqmp_power",
+               .of_match_table = pm_of_match,
+       },
+};
+module_platform_driver(zynqmp_pm_platform_driver);