platform:x86: Add Intel telemetry platform device

Telemetry Device is created by the pmc_ipc driver. Resources
are populated according SSRAM region as indicated by the BIOS tables.

Signed-off-by: Souvik Kumar Chakravarty <souvik.k.chakravarty@intel.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

1 files changed, 96 insertions, 0 deletions

diff --git a/drivers/platform/x86/intel_pmc_ipc.c b/drivers/platform/x86/intel_pmc_ipc.c
index ca69135dc2dc..092519e37de6 100644
--- a/drivers/platform/x86/intel_pmc_ipc.c
+++ b/drivers/platform/x86/intel_pmc_ipc.c
@@ -70,6 +70,7 @@
 #define PLAT_RESOURCE_GCR_SIZE          0x1000
 #define PLAT_RESOURCE_BIOS_DATA_INDEX   1
 #define PLAT_RESOURCE_BIOS_IFACE_INDEX  2
+#define PLAT_RESOURCE_TELEM_SSRAM_INDEX 3
 #define PLAT_RESOURCE_ISP_DATA_INDEX    4
 #define PLAT_RESOURCE_ISP_IFACE_INDEX   5
 #define PLAT_RESOURCE_GTD_DATA_INDEX    6
@@ -88,6 +89,10 @@
 #define TCO_BASE_OFFSET                 0x60
 #define TCO_REGS_SIZE                   16
 #define PUNIT_DEVICE_NAME               "intel_punit_ipc"
+#define TELEMETRY_DEVICE_NAME           "intel_telemetry"
+#define TELEM_SSRAM_SIZE                240
+#define TELEM_PMC_SSRAM_OFFSET          0x1B00
+#define TELEM_PUNIT_SSRAM_OFFSET        0x1A00
 
 static const int iTCO_version = 3;
 
@@ -110,6 +115,14 @@ static struct intel_pmc_ipc_dev {
 
         /* punit */
         struct platform_device *punit_dev;
+
+        /* Telemetry */
+        resource_size_t telem_pmc_ssram_base;
+        resource_size_t telem_punit_ssram_base;
+        int telem_pmc_ssram_size;
+        int telem_punit_ssram_size;
+        u8 telem_res_inval;
+        struct platform_device *telemetry_dev;
 } ipcdev;
 
 static char *ipc_err_sources[] = {
@@ -491,6 +504,18 @@ static struct itco_wdt_platform_data tco_info = {
         .version = 3,
 };
 
+#define TELEMETRY_RESOURCE_PUNIT_SSRAM  0
+#define TELEMETRY_RESOURCE_PMC_SSRAM    1
+static struct resource telemetry_res[] = {
+        /*Telemetry*/
+        {
+                .flags = IORESOURCE_MEM,
+        },
+        {
+                .flags = IORESOURCE_MEM,
+        },
+};
+
 static int ipc_create_punit_device(void)
 {
         struct platform_device *pdev;
@@ -574,6 +599,51 @@ err:
         return ret;
 }
 
+static int ipc_create_telemetry_device(void)
+{
+        struct platform_device *pdev;
+        struct resource *res;
+        int ret;
+
+        pdev = platform_device_alloc(TELEMETRY_DEVICE_NAME, -1);
+        if (!pdev) {
+                dev_err(ipcdev.dev,
+                        "Failed to allocate telemetry platform device\n");
+                return -ENOMEM;
+        }
+
+        pdev->dev.parent = ipcdev.dev;
+
+        res = telemetry_res + TELEMETRY_RESOURCE_PUNIT_SSRAM;
+        res->start = ipcdev.telem_punit_ssram_base;
+        res->end = res->start + ipcdev.telem_punit_ssram_size - 1;
+
+        res = telemetry_res + TELEMETRY_RESOURCE_PMC_SSRAM;
+        res->start = ipcdev.telem_pmc_ssram_base;
+        res->end = res->start + ipcdev.telem_pmc_ssram_size - 1;
+
+        ret = platform_device_add_resources(pdev, telemetry_res,
+                                            ARRAY_SIZE(telemetry_res));
+        if (ret) {
+                dev_err(ipcdev.dev,
+                        "Failed to add telemetry platform resources\n");
+                goto err;
+        }
+
+        ret = platform_device_add(pdev);
+        if (ret) {
+                dev_err(ipcdev.dev,
+                        "Failed to add telemetry platform device\n");
+                goto err;
+        }
+        ipcdev.telemetry_dev = pdev;
+
+        return 0;
+err:
+        platform_device_put(pdev);
+        return ret;
+}
+
 static int ipc_create_pmc_devices(void)
 {
         int ret;
@@ -588,6 +658,14 @@ static int ipc_create_pmc_devices(void)
                 dev_err(ipcdev.dev, "Failed to add punit platform device\n");
                 platform_device_unregister(ipcdev.tco_dev);
         }
+
+        if (!ipcdev.telem_res_inval) {
+                ret = ipc_create_telemetry_device();
+                if (ret)
+                        dev_warn(ipcdev.dev,
+                                "Failed to add telemetry platform device\n");
+        }
+
         return ret;
 }
 
@@ -692,6 +770,22 @@ static int ipc_plat_get_res(struct platform_device *pdev)
         ipcdev.gcr_size = PLAT_RESOURCE_GCR_SIZE;
         dev_info(&pdev->dev, "ipc res: %pR\n", res);
 
+        ipcdev.telem_res_inval = 0;
+        res = platform_get_resource(pdev, IORESOURCE_MEM,
+                                    PLAT_RESOURCE_TELEM_SSRAM_INDEX);
+        if (!res) {
+                dev_err(&pdev->dev, "Failed to get telemetry ssram resource\n");
+                ipcdev.telem_res_inval = 1;
+        } else {
+                ipcdev.telem_punit_ssram_base = res->start +
+                                                TELEM_PUNIT_SSRAM_OFFSET;
+                ipcdev.telem_punit_ssram_size = TELEM_SSRAM_SIZE;
+                ipcdev.telem_pmc_ssram_base = res->start +
+                                                TELEM_PMC_SSRAM_OFFSET;
+                ipcdev.telem_pmc_ssram_size = TELEM_SSRAM_SIZE;
+                dev_info(&pdev->dev, "telemetry ssram res: %pR\n", res);
+        }
+
         return 0;
 }
 
@@ -749,6 +843,7 @@ err_sys:
 err_irq:
         platform_device_unregister(ipcdev.tco_dev);
         platform_device_unregister(ipcdev.punit_dev);
+        platform_device_unregister(ipcdev.telemetry_dev);
 err_device:
         iounmap(ipcdev.ipc_base);
         res = platform_get_resource(pdev, IORESOURCE_MEM,
@@ -766,6 +861,7 @@ static int ipc_plat_remove(struct platform_device *pdev)
         free_irq(ipcdev.irq, &ipcdev);
         platform_device_unregister(ipcdev.tco_dev);
         platform_device_unregister(ipcdev.punit_dev);
+        platform_device_unregister(ipcdev.telemetry_dev);
         iounmap(ipcdev.ipc_base);
         res = platform_get_resource(pdev, IORESOURCE_MEM,
                                     PLAT_RESOURCE_IPC_INDEX);