- compatible: Must contain: "xlnx,zynqmp-power"
- interrupts: Interrupt specifier
--------
-Example
--------
+Optional properties:
+ - mbox-names : Name given to channels seen in the 'mboxes' property.
+ "tx" - Mailbox corresponding to transmit path
+ "rx" - Mailbox corresponding to receive path
+ - mboxes : Standard property to specify a Mailbox. Each value of
+ the mboxes property should contain a phandle to the
+ mailbox controller device node and an args specifier
+ that will be the phandle to the intended sub-mailbox
+ child node to be used for communication. See
+ Documentation/devicetree/bindings/mailbox/mailbox.txt
+ for more details about the generic mailbox controller
+ and client driver bindings. Also see
+ Documentation/devicetree/bindings/mailbox/ \
+ xlnx,zynqmp-ipi-mailbox.txt for typical controller that
+ is used to communicate with this System controllers.
+
+--------
+Examples
+--------
+
+Example with interrupt method:
+
+firmware {
+ zynqmp_firmware: zynqmp-firmware {
+ compatible = "xlnx,zynqmp-firmware";
+ method = "smc";
+
+ zynqmp_power: zynqmp-power {
+ compatible = "xlnx,zynqmp-power";
+ interrupts = <0 35 4>;
+ };
+ };
+};
+
+Example with IPI mailbox method:
firmware {
zynqmp_firmware: zynqmp-firmware {
zynqmp_power: zynqmp-power {
compatible = "xlnx,zynqmp-power";
+ interrupt-parent = <&gic>;
interrupts = <0 35 4>;
+ mboxes = <&ipi_mailbox_pmu0 0>,
+ <&ipi_mailbox_pmu0 1>;
+ mbox-names = "tx", "rx";
};
};
};
static const struct zynqmp_eemi_ops *eemi_ops_tbl;
+static bool feature_check_enabled;
+static u32 zynqmp_pm_features[PM_API_MAX];
+
static const struct mfd_cell firmware_devs[] = {
{
.name = "zynqmp_power_controller",
case XST_PM_SUCCESS:
case XST_PM_DOUBLE_REQ:
return 0;
+ case XST_PM_NO_FEATURE:
+ return -ENOTSUPP;
case XST_PM_NO_ACCESS:
return -EACCES;
case XST_PM_ABORT_SUSPEND:
}
/**
+ * zynqmp_pm_feature() - Check weather given feature is supported or not
+ * @api_id: API ID to check
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_feature(u32 api_id)
+{
+ int ret;
+ u32 ret_payload[PAYLOAD_ARG_CNT];
+ u64 smc_arg[2];
+
+ if (!feature_check_enabled)
+ return 0;
+
+ /* Return value if feature is already checked */
+ if (zynqmp_pm_features[api_id] != PM_FEATURE_UNCHECKED)
+ return zynqmp_pm_features[api_id];
+
+ smc_arg[0] = PM_SIP_SVC | PM_FEATURE_CHECK;
+ smc_arg[1] = api_id;
+
+ ret = do_fw_call(smc_arg[0], smc_arg[1], 0, ret_payload);
+ if (ret) {
+ zynqmp_pm_features[api_id] = PM_FEATURE_INVALID;
+ return PM_FEATURE_INVALID;
+ }
+
+ zynqmp_pm_features[api_id] = ret_payload[1];
+
+ return zynqmp_pm_features[api_id];
+}
+
+/**
* zynqmp_pm_invoke_fn() - Invoke the system-level platform management layer
* caller function depending on the configuration
* @pm_api_id: Requested PM-API call
*/
u64 smc_arg[4];
+ if (zynqmp_pm_feature(pm_api_id) == PM_FEATURE_INVALID)
+ return -ENOTSUPP;
+
smc_arg[0] = PM_SIP_SVC | pm_api_id;
smc_arg[1] = ((u64)arg1 << 32) | arg0;
smc_arg[2] = ((u64)arg3 << 32) | arg2;
np = of_find_compatible_node(NULL, NULL, "xlnx,versal");
if (!np)
return 0;
+
+ feature_check_enabled = true;
}
of_node_put(np);
/*
* Xilinx Zynq MPSoC Power Management
*
- * Copyright (C) 2014-2018 Xilinx, Inc.
+ * Copyright (C) 2014-2019 Xilinx, Inc.
*
* Davorin Mista <davorin.mista@aggios.com>
* Jolly Shah <jollys@xilinx.com>
#include <linux/suspend.h>
#include <linux/firmware/xlnx-zynqmp.h>
+#include <linux/mailbox/zynqmp-ipi-message.h>
+
+/**
+ * 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;
+static struct mbox_chan *rx_chan;
+static const struct zynqmp_eemi_ops *eemi_ops;
enum pm_suspend_mode {
PM_SUSPEND_MODE_FIRST = 0,
};
static enum pm_suspend_mode suspend_mode = PM_SUSPEND_MODE_STD;
-static const struct zynqmp_eemi_ops *eemi_ops;
enum pm_api_cb_id {
PM_INIT_SUSPEND_CB = 30,
return IRQ_HANDLED;
}
+static void ipi_receive_callback(struct mbox_client *cl, void *data)
+{
+ struct zynqmp_ipi_message *msg = (struct zynqmp_ipi_message *)data;
+ u32 payload[CB_PAYLOAD_SIZE];
+ int ret;
+
+ memcpy(payload, msg->data, sizeof(msg->len));
+ /* 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))
+ return;
+
+ /* 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);
+
+ /* Send NULL message to mbox controller to ack the message */
+ ret = mbox_send_message(rx_chan, NULL);
+ if (ret)
+ pr_err("IPI ack failed. Error %d\n", ret);
+ }
+}
+
+/**
+ * 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] == SUSPEND_SYSTEM_SHUTDOWN) {
+ orderly_poweroff(true);
+ } else if (pm_work->args[0] == SUSPEND_POWER_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)
{
{
int ret, irq;
u32 pm_api_version;
+ struct mbox_client *client;
eemi_ops = zynqmp_pm_get_eemi_ops();
if (IS_ERR(eemi_ops))
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;
+ if (of_find_property(pdev->dev.of_node, "mboxes", NULL)) {
+ zynqmp_pm_init_suspend_work =
+ devm_kzalloc(&pdev->dev,
+ sizeof(struct zynqmp_pm_work_struct),
+ GFP_KERNEL);
+ if (!zynqmp_pm_init_suspend_work)
+ return -ENOMEM;
+
+ INIT_WORK(&zynqmp_pm_init_suspend_work->callback_work,
+ zynqmp_pm_init_suspend_work_fn);
+ client = devm_kzalloc(&pdev->dev, sizeof(*client), GFP_KERNEL);
+ if (!client)
+ return -ENOMEM;
+
+ client->dev = &pdev->dev;
+ client->rx_callback = ipi_receive_callback;
+
+ rx_chan = mbox_request_channel_byname(client, "rx");
+ if (IS_ERR(rx_chan)) {
+ dev_err(&pdev->dev, "Failed to request rx channel\n");
+ return IS_ERR(rx_chan);
+ }
+ } else if (of_find_property(pdev->dev.of_node, "interrupts", NULL)) {
+ 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;
+ }
+ } else {
+ dev_err(&pdev->dev, "Required property not found in DT node\n");
+ return -ENOENT;
}
ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
{
sysfs_remove_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
+ if (!rx_chan)
+ mbox_free_channel(rx_chan);
+
return 0;
}