firmware: xilinx: Expand feature check to support all PLM modules

To support feature check for all modules, append the module id of the API
that is being checked to the feature check API so it could be routed to
the target module for processing.

There is no need to check compatible string because the board information
is taken via firmware interface.

Co-developed-by: Saeed Nowshadi <saeed.nowshadi@amd.com>
Signed-off-by: Saeed Nowshadi <saeed.nowshadi@amd.com>
Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@amd.com>
Link: https://lore.kernel.org/r/20231129112713.22718-3-jay.buddhabhatti@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 2a7fd3fbac8c47d39abdc5059e6f7e7349f64d11..ec77aefee17e45ef13a66c1fe90a660121ef5157 100644 (file)
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -199,9 +199,29 @@ static int __do_feature_check_call(const u32 api_id, u32 *ret_payload)
 {
        int ret;
        u64 smc_arg[2];
+       u32 module_id;
+       u32 feature_check_api_id;
 
-       smc_arg[0] = PM_SIP_SVC | PM_FEATURE_CHECK;
-       smc_arg[1] = api_id;
+       module_id = FIELD_GET(MODULE_ID_MASK, api_id);
+
+       /*
+        * Feature check of APIs belonging to PM, XSEM, and TF-A are handled by calling
+        * PM_FEATURE_CHECK API. For other modules, call PM_API_FEATURES API.
+        */
+       if (module_id == PM_MODULE_ID || module_id == XSEM_MODULE_ID || module_id == TF_A_MODULE_ID)
+               feature_check_api_id = PM_FEATURE_CHECK;
+       else
+               feature_check_api_id = PM_API_FEATURES;
+
+       /*
+        * Feature check of TF-A APIs is done in the TF-A layer and it expects for
+        * MODULE_ID_MASK bits of SMC's arg[0] to be the same as PM_MODULE_ID.
+        */
+       if (module_id == TF_A_MODULE_ID)
+               module_id = PM_MODULE_ID;
+
+       smc_arg[0] = PM_SIP_SVC | FIELD_PREP(MODULE_ID_MASK, module_id) | feature_check_api_id;
+       smc_arg[1] = (api_id & API_ID_MASK);
 
        ret = do_fw_call(ret_payload, 2, smc_arg[0], smc_arg[1]);
        if (ret)
@@ -1904,22 +1924,9 @@ static int zynqmp_firmware_probe(struct platform_device *pdev)
        if (ret)
                return ret;
 
-       np = of_find_compatible_node(NULL, NULL, "xlnx,zynqmp");
-       if (!np) {
-               np = of_find_compatible_node(NULL, NULL, "xlnx,versal");
-               if (!np)
-                       return 0;
-
+       ret = do_feature_check_call(PM_FEATURE_CHECK);
+       if (ret >= 0 && ((ret & FIRMWARE_VERSION_MASK) >= PM_API_VERSION_1))
                feature_check_enabled = true;
-       }
-
-       if (!feature_check_enabled) {
-               ret = do_feature_check_call(PM_FEATURE_CHECK);
-               if (ret >= 0)
-                       feature_check_enabled = true;
-       }
-
-       of_node_put(np);
 
        devinfo = devm_kzalloc(dev, sizeof(*devinfo), GFP_KERNEL);
        if (!devinfo)

diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 41190bbed8edfd51860892627543878610b93ded..e9a7fece5efef5ce2de54e94903f73c19b0ae8ea 100644 (file)
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -32,6 +32,7 @@
 #define PM_SIP_SVC                     0xC2000000
 
 /* PM API versions */
+#define PM_API_VERSION_1       1
 #define PM_API_VERSION_2       2
 
 #define PM_PINCTRL_PARAM_SET_VERSION   2
@@ -47,6 +48,9 @@
 #define FAMILY_CODE_MASK       GENMASK(27, 21)
 #define SUB_FAMILY_CODE_MASK   GENMASK(20, 19)
 
+#define API_ID_MASK            GENMASK(7, 0)
+#define MODULE_ID_MASK         GENMASK(11, 8)
+
 /* ATF only commands */
 #define TF_A_PM_REGISTER_SGI           0xa04
 #define PM_GET_TRUSTZONE_VERSION       0xa03
@@ -112,6 +116,12 @@
 #define XPM_EVENT_ERROR_MASK_NOC_NCR           BIT(13)
 #define XPM_EVENT_ERROR_MASK_NOC_CR            BIT(12)
 
+enum pm_module_id {
+       PM_MODULE_ID = 0x0,
+       XSEM_MODULE_ID = 0x3,
+       TF_A_MODULE_ID = 0xa,
+};
+
 enum pm_api_cb_id {
        PM_INIT_SUSPEND_CB = 30,
        PM_ACKNOWLEDGE_CB = 31,
@@ -119,6 +129,7 @@ enum pm_api_cb_id {
 };
 
 enum pm_api_id {
+       PM_API_FEATURES = 0,
        PM_GET_API_VERSION = 1,
        PM_REGISTER_NOTIFIER = 5,
        PM_FORCE_POWERDOWN = 8,