power: zynqmp: Add power domain driver for ZynqMP

Driver should be enabled by CONFIG_POWER_DOMAIN=y and
CONFIG_ZYNQMP_POWER_DOMAIN=y. Power domain driver doesn't have own DT node
but it uses zynqmp firmware DT node that's why there is a need to bind
driver when firmware node is found.

Driver itself is simple. It is sending pmufw config object overlay for
enabling access to device which is done in ...domain_request().
In ...domain_on() capabilities are passed and node is requested.
This should be bare minimum of required to get power domain driver working.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Link: https://lore.kernel.org/r/f4b9433b91c0b18c375b061c7a4e29d428f70547.1644226055.git.michal.simek@xilinx.com

diff --git a/MAINTAINERS b/MAINTAINERS
index dcdd99e..8bcdea2 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -634,6 +634,7 @@ F:  drivers/mtd/nand/raw/zynq_nand.c
 F:     drivers/net/phy/xilinx_phy.c
 F:     drivers/net/zynq_gem.c
 F:     drivers/phy/phy-zynqmp.c
+F:     drivers/power/domain/zynqmp-power-domain.c
 F:     drivers/serial/serial_zynq.c
 F:     drivers/reset/reset-zynqmp.c
 F:     drivers/rtc/zynqmp_rtc.c

diff --git a/drivers/firmware/firmware-zynqmp.c b/drivers/firmware/firmware-zynqmp.c
index 839203e..8d78888 100644 (file)
--- a/drivers/firmware/firmware-zynqmp.c
+++ b/drivers/firmware/firmware-zynqmp.c
@@ -8,6 +8,7 @@
 #include <common.h>
 #include <cpu_func.h>
 #include <dm.h>
+#include <dm/lists.h>
 #include <log.h>
 #include <zynqmp_firmware.h>
 #include <asm/cache.h>
@@ -226,8 +227,27 @@ static const struct udevice_id zynqmp_firmware_ids[] = {
        { }
 };
 
+static int zynqmp_firmware_bind(struct udevice *dev)
+{
+       int ret;
+       struct udevice *child;
+
+       if (IS_ENABLED(CONFIG_ZYNQMP_POWER_DOMAIN)) {
+               ret = device_bind_driver_to_node(dev, "zynqmp_power_domain",
+                                                "zynqmp_power_domain",
+                                                dev_ofnode(dev), &child);
+               if (ret) {
+                       printf("zynqmp power domain driver is not bound: %d\n", ret);
+                       return ret;
+               }
+       }
+
+       return dm_scan_fdt_dev(dev);
+}
+
 U_BOOT_DRIVER(zynqmp_firmware) = {
        .id = UCLASS_FIRMWARE,
        .name = "zynqmp_firmware",
        .of_match = zynqmp_firmware_ids,
+       .bind = zynqmp_firmware_bind,
 };

diff --git a/drivers/power/domain/Kconfig b/drivers/power/domain/Kconfig
index 9aea5fc..93d2599 100644 (file)
--- a/drivers/power/domain/Kconfig
+++ b/drivers/power/domain/Kconfig
@@ -88,4 +88,13 @@ config TI_POWER_DOMAIN
        help
          Generic power domain implementation for TI K3 devices.
 
+config ZYNQMP_POWER_DOMAIN
+       bool "Enable the Xilinx ZynqMP Power domain driver"
+       depends on POWER_DOMAIN && ZYNQMP_FIRMWARE
+       help
+         Generic power domain implementation for Xilinx ZynqMP devices.
+         The driver should be enabled when system starts in very minimal
+         configuration and it is extended at run time. Then enabling
+         the driver will ensure that PMUFW enable access to requested IP.
+
 endmenu

diff --git a/drivers/power/domain/Makefile b/drivers/power/domain/Makefile
index 530ae35..7c8af67 100644 (file)
--- a/drivers/power/domain/Makefile
+++ b/drivers/power/domain/Makefile
@@ -16,3 +16,4 @@ obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain-test.o
 obj-$(CONFIG_TEGRA186_POWER_DOMAIN) += tegra186-power-domain.o
 obj-$(CONFIG_TI_SCI_POWER_DOMAIN) += ti-sci-power-domain.o
 obj-$(CONFIG_TI_POWER_DOMAIN) += ti-power-domain.o
+obj-$(CONFIG_ZYNQMP_POWER_DOMAIN) += zynqmp-power-domain.o

diff --git a/drivers/power/domain/zynqmp-power-domain.c b/drivers/power/domain/zynqmp-power-domain.c
new file mode 100644 (file)
index 0000000..5383d09
--- /dev/null
+++ b/drivers/power/domain/zynqmp-power-domain.c
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021, Xilinx. Inc.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <log.h>
+#include <malloc.h>
+#include <misc.h>
+#include <power-domain-uclass.h>
+#include <linux/bitops.h>
+
+#include <zynqmp_firmware.h>
+
+#define NODE_ID_LOCATION       5
+
+static unsigned int xpm_configobject[] = {
+       /* HEADER */
+       2,      /* Number of remaining words in the header */
+       1,      /* Number of sections included in config object */
+       PM_CONFIG_OBJECT_TYPE_OVERLAY,  /* Type of Config object as overlay */
+       /* SLAVE SECTION */
+
+       PM_CONFIG_SLAVE_SECTION_ID,     /* Section ID */
+       1,                              /* Number of slaves */
+
+       0, /* Node ID which will be changed below */
+       PM_SLAVE_FLAG_IS_SHAREABLE,
+       PM_CONFIG_IPI_PSU_CORTEXA53_0_MASK |
+       PM_CONFIG_IPI_PSU_CORTEXR5_0_MASK |
+       PM_CONFIG_IPI_PSU_CORTEXR5_1_MASK, /* IPI Mask */
+};
+
+static int zynqmp_pm_request_node(const u32 node, const u32 capabilities,
+                                 const u32 qos, const enum zynqmp_pm_request_ack ack)
+{
+       return xilinx_pm_request(PM_REQUEST_NODE, node, capabilities,
+                                  qos, ack, NULL);
+}
+
+static int zynqmp_power_domain_request(struct power_domain *power_domain)
+{
+       /* Record power domain id */
+       xpm_configobject[NODE_ID_LOCATION] = power_domain->id;
+
+       zynqmp_pmufw_load_config_object(xpm_configobject, sizeof(xpm_configobject));
+
+       return 0;
+}
+
+static int zynqmp_power_domain_free(struct power_domain *power_domain)
+{
+       /* nop now */
+       return 0;
+}
+
+static int zynqmp_power_domain_on(struct power_domain *power_domain)
+{
+       return zynqmp_pm_request_node(power_domain->id,
+                                     ZYNQMP_PM_CAPABILITY_ACCESS,
+                                     ZYNQMP_PM_MAX_QOS,
+                                     ZYNQMP_PM_REQUEST_ACK_BLOCKING);
+}
+
+static int zynqmp_power_domain_off(struct power_domain *power_domain)
+{
+       /* nop now */
+       return 0;
+}
+
+struct power_domain_ops zynqmp_power_domain_ops = {
+       .request = zynqmp_power_domain_request,
+       .rfree = zynqmp_power_domain_free,
+       .on = zynqmp_power_domain_on,
+       .off = zynqmp_power_domain_off,
+};
+
+static int zynqmp_power_domain_probe(struct udevice *dev)
+{
+       return 0;
+}
+
+U_BOOT_DRIVER(zynqmp_power_domain) = {
+       .name = "zynqmp_power_domain",
+       .id = UCLASS_POWER_DOMAIN,
+       .probe = zynqmp_power_domain_probe,
+       .ops = &zynqmp_power_domain_ops,
+};

diff --git a/include/zynqmp_firmware.h b/include/zynqmp_firmware.h
index cfd92d3..19c004e 100644 (file)
--- a/include/zynqmp_firmware.h
+++ b/include/zynqmp_firmware.h
@@ -371,4 +371,35 @@ void zynqmp_pmufw_load_config_object(const void *cfg_obj, size_t size);
 int xilinx_pm_request(u32 api_id, u32 arg0, u32 arg1, u32 arg2,
                      u32 arg3, u32 *ret_payload);
 
+/* Type of Config Object */
+#define PM_CONFIG_OBJECT_TYPE_BASE     0x1U
+#define PM_CONFIG_OBJECT_TYPE_OVERLAY  0x2U
+
+/* Section Id */
+#define PM_CONFIG_SLAVE_SECTION_ID     0x102U
+#define PM_CONFIG_SET_CONFIG_SECTION_ID        0x107U
+
+/* Flag Option */
+#define PM_SLAVE_FLAG_IS_SHAREABLE     0x1U
+#define PM_MASTER_USING_SLAVE_MASK     0x2U
+
+/* IPI Mask for Master */
+#define PM_CONFIG_IPI_PSU_CORTEXA53_0_MASK     0x00000001
+#define PM_CONFIG_IPI_PSU_CORTEXR5_0_MASK      0x00000100
+#define PM_CONFIG_IPI_PSU_CORTEXR5_1_MASK      0x00000200
+
+enum zynqmp_pm_request_ack {
+       ZYNQMP_PM_REQUEST_ACK_NO = 1,
+       ZYNQMP_PM_REQUEST_ACK_BLOCKING = 2,
+       ZYNQMP_PM_REQUEST_ACK_NON_BLOCKING = 3,
+};
+
+/* Node capabilities */
+#define ZYNQMP_PM_CAPABILITY_ACCESS    0x1U
+#define ZYNQMP_PM_CAPABILITY_CONTEXT   0x2U
+#define ZYNQMP_PM_CAPABILITY_WAKEUP    0x4U
+#define ZYNQMP_PM_CAPABILITY_UNUSABLE  0x8U
+
+#define ZYNQMP_PM_MAX_QOS              100U
+
 #endif /* _ZYNQMP_FIRMWARE_H_ */