platform/x86: Revert intel_pmc_ipc: Use MFD framework to create dependent devices

Heikki discovered a runtime issue with this patch. Taking into
consideration we have no time to test any fix right now, revert the
commit 43aaf4f0.
Reported-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/x86/intel_pmc_ipc.c

@@ -20,7 +20,6 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/device.h>
-#include <linux/mfd/core.h>
 #include <linux/pm.h>
 #include <linux/pci.h>
 #include <linux/platform_device.h>
@@ -89,7 +88,6 @@
 #define PLAT_RESOURCE_ISP_IFACE_INDEX	5
 #define PLAT_RESOURCE_GTD_DATA_INDEX	6
 #define PLAT_RESOURCE_GTD_IFACE_INDEX	7
-#define PLAT_RESOURCE_MEM_MAX_INDEX	8
 #define PLAT_RESOURCE_ACPI_IO_INDEX	0
 
 /*
@@ -108,6 +106,8 @@
 #define TELEM_SSRAM_SIZE		240
 #define TELEM_PMC_SSRAM_OFFSET		0x1B00
 #define TELEM_PUNIT_SSRAM_OFFSET	0x1A00
+#define TCO_PMC_OFFSET			0x8
+#define TCO_PMC_SIZE			0x4
 
 /* PMC register bit definitions */
 
@@ -124,10 +124,26 @@ static struct intel_pmc_ipc_dev {
 	int cmd;
 	struct completion cmd_complete;
 
+	/* The following PMC BARs share the same ACPI device with the IPC */
+	resource_size_t acpi_io_base;
+	int acpi_io_size;
+	struct platform_device *tco_dev;
+
 	/* gcr */
 	void __iomem *gcr_mem_base;
 	bool has_gcr_regs;
 	spinlock_t gcr_lock;
+
+	/* 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[] = {
@@ -492,7 +508,7 @@ static int ipc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	ret = devm_request_irq(&pdev->dev, pdev->irq, ioc, 0, "intel_pmc_ipc",
 				pmc);
 	if (ret) {
-		dev_err(&pdev->dev, "Failed to request IRQ\n");
+		dev_err(&pdev->dev, "Failed to request irq\n");
 		return ret;
 	}
 
@@ -577,6 +593,44 @@ static const struct attribute_group intel_ipc_group = {
 	.attrs = intel_ipc_attrs,
 };
 
+static struct resource punit_res_array[] = {
+	/* Punit BIOS */
+	{
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.flags = IORESOURCE_MEM,
+	},
+	/* Punit ISP */
+	{
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.flags = IORESOURCE_MEM,
+	},
+	/* Punit GTD */
+	{
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.flags = IORESOURCE_MEM,
+	},
+};
+
+#define TCO_RESOURCE_ACPI_IO		0
+#define TCO_RESOURCE_SMI_EN_IO		1
+#define TCO_RESOURCE_GCR_MEM		2
+static struct resource tco_res[] = {
+	/* ACPI - TCO */
+	{
+		.flags = IORESOURCE_IO,
+	},
+	/* ACPI - SMI */
+	{
+		.flags = IORESOURCE_IO,
+	},
+};
+
 static struct itco_wdt_platform_data tco_info = {
 	.name = "Apollo Lake SoC",
 	.version = 5,
@@ -584,177 +638,234 @@ static struct itco_wdt_platform_data tco_info = {
 	.update_no_reboot_bit = update_no_reboot_bit,
 };
 
-static int ipc_create_punit_device(struct platform_device *pdev)
-{
-	struct resource punit_res[PLAT_RESOURCE_MEM_MAX_INDEX];
-	struct mfd_cell punit_cell;
-	struct resource *res;
-	int mindex, pindex = 0;
-
-	for (mindex = 0; mindex <= PLAT_RESOURCE_MEM_MAX_INDEX; mindex++) {
-
-		res = platform_get_resource(pdev, IORESOURCE_MEM, mindex);
+#define TELEMETRY_RESOURCE_PUNIT_SSRAM	0
+#define TELEMETRY_RESOURCE_PMC_SSRAM	1
+static struct resource telemetry_res[] = {
+	/*Telemetry*/
+	{
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.flags = IORESOURCE_MEM,
+	},
+};
 
-		switch (mindex) {
-		/* Get PUNIT resources */
-		case PLAT_RESOURCE_BIOS_DATA_INDEX:
-		case PLAT_RESOURCE_BIOS_IFACE_INDEX:
-			/* BIOS resources are required, so return error if not
-			 * available
-			 */
-			if (!res) {
-				dev_err(&pdev->dev,
-					"Failed to get PUNIT MEM resource %d\n",
-					pindex);
-				return -ENXIO;
-			}
-		case PLAT_RESOURCE_ISP_DATA_INDEX:
-		case PLAT_RESOURCE_ISP_IFACE_INDEX:
-		case PLAT_RESOURCE_GTD_DATA_INDEX:
-		case PLAT_RESOURCE_GTD_IFACE_INDEX:
-			/* if valid resource found, copy the resource to PUNIT
-			 * resource
-			 */
-			if (res)
-				memcpy(&punit_res[pindex], res, sizeof(*res));
-			punit_res[pindex].flags = IORESOURCE_MEM;
-			dev_dbg(&pdev->dev, "PUNIT memory res: %pR\n",
-				&punit_res[pindex]);
-			pindex++;
-			break;
+static int ipc_create_punit_device(void)
+{
+	struct platform_device *pdev;
+	const struct platform_device_info pdevinfo = {
+		.parent = ipcdev.dev,
+		.name = PUNIT_DEVICE_NAME,
+		.id = -1,
+		.res = punit_res_array,
+		.num_res = ARRAY_SIZE(punit_res_array),
 		};
-	}
 
-	/* Create PUNIT IPC MFD cell */
-	punit_cell.name = PUNIT_DEVICE_NAME;
-	punit_cell.num_resources = ARRAY_SIZE(punit_res);
-	punit_cell.resources = punit_res;
-	punit_cell.ignore_resource_conflicts = 1;
+	pdev = platform_device_register_full(&pdevinfo);
+	if (IS_ERR(pdev))
+		return PTR_ERR(pdev);
 
-	return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
-				    &punit_cell, 1, NULL, 0, NULL);
+	ipcdev.punit_dev = pdev;
+
+	return 0;
 }
 
-static int ipc_create_wdt_device(struct platform_device *pdev)
+static int ipc_create_tco_device(void)
 {
-	static struct resource wdt_ipc_res[2];
+	struct platform_device *pdev;
 	struct resource *res;
-	static struct mfd_cell wdt_cell;
-
-	/* If we have ACPI based watchdog use that instead, othewise create
-	 * a MFD cell for iTCO watchdog
-	 */
-	if (acpi_has_watchdog())
-		return 0;
+	const struct platform_device_info pdevinfo = {
+		.parent = ipcdev.dev,
+		.name = TCO_DEVICE_NAME,
+		.id = -1,
+		.res = tco_res,
+		.num_res = ARRAY_SIZE(tco_res),
+		.data = &tco_info,
+		.size_data = sizeof(tco_info),
+		};
 
-	/* Get iTCO watchdog resources */
-	res = platform_get_resource(pdev, IORESOURCE_IO,
-				    PLAT_RESOURCE_ACPI_IO_INDEX);
-	if (!res) {
-		dev_err(&pdev->dev, "Failed to get WDT resource\n");
-		return -ENXIO;
-	}
+	res = tco_res + TCO_RESOURCE_ACPI_IO;
+	res->start = ipcdev.acpi_io_base + TCO_BASE_OFFSET;
+	res->end = res->start + TCO_REGS_SIZE - 1;
 
-	wdt_ipc_res[0].start = res->start + TCO_BASE_OFFSET;
-	wdt_ipc_res[0].end = res->start +
-		TCO_BASE_OFFSET + TCO_REGS_SIZE - 1;
-	wdt_ipc_res[0].flags = IORESOURCE_IO;
-	wdt_ipc_res[1].start = res->start + SMI_EN_OFFSET;
-	wdt_ipc_res[1].end = res->start +
-		SMI_EN_OFFSET + SMI_EN_SIZE - 1;
-	wdt_ipc_res[1].flags = IORESOURCE_IO;
+	res = tco_res + TCO_RESOURCE_SMI_EN_IO;
+	res->start = ipcdev.acpi_io_base + SMI_EN_OFFSET;
+	res->end = res->start + SMI_EN_SIZE - 1;
 
-	dev_dbg(&pdev->dev, "watchdog res 0: %pR\n", &wdt_ipc_res[0]);
-	dev_dbg(&pdev->dev, "watchdog res 1: %pR\n", &wdt_ipc_res[1]);
+	pdev = platform_device_register_full(&pdevinfo);
+	if (IS_ERR(pdev))
+		return PTR_ERR(pdev);
 
-	wdt_cell.name = TCO_DEVICE_NAME;
-	wdt_cell.platform_data = &tco_info;
-	wdt_cell.pdata_size = sizeof(tco_info);
-	wdt_cell.num_resources = ARRAY_SIZE(wdt_ipc_res);
-	wdt_cell.resources = wdt_ipc_res;
-	wdt_cell.ignore_resource_conflicts = 1;
+	ipcdev.tco_dev = pdev;
 
-	return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
-				    &wdt_cell, 1, NULL, 0, NULL);
+	return 0;
 }
 
-static int ipc_create_telemetry_device(struct platform_device *pdev)
+static int ipc_create_telemetry_device(void)
 {
-	struct resource telemetry_ipc_res[2];
-	struct mfd_cell telemetry_cell;
+	struct platform_device *pdev;
 	struct resource *res;
+	const struct platform_device_info pdevinfo = {
+		.parent = ipcdev.dev,
+		.name = TELEMETRY_DEVICE_NAME,
+		.id = -1,
+		.res = telemetry_res,
+		.num_res = ARRAY_SIZE(telemetry_res),
+		};
 
-	/* Get telemetry resources */
-	res = platform_get_resource(pdev, IORESOURCE_MEM,
-				    PLAT_RESOURCE_TELEM_SSRAM_INDEX);
-	if (!res) {
-		dev_err(&pdev->dev, "Failed to get telemetry resource\n");
-		return -ENXIO;
-	}
+	res = telemetry_res + TELEMETRY_RESOURCE_PUNIT_SSRAM;
+	res->start = ipcdev.telem_punit_ssram_base;
+	res->end = res->start + ipcdev.telem_punit_ssram_size - 1;
 
-	telemetry_ipc_res[0].start = res->start + TELEM_PUNIT_SSRAM_OFFSET;
-	telemetry_ipc_res[0].end = res->start +
-		TELEM_PUNIT_SSRAM_OFFSET + TELEM_SSRAM_SIZE - 1;
-	telemetry_ipc_res[0].flags = IORESOURCE_MEM;
-	telemetry_ipc_res[1].start = res->start + TELEM_PMC_SSRAM_OFFSET;
-	telemetry_ipc_res[1].end = res->start +
-		TELEM_PMC_SSRAM_OFFSET + TELEM_SSRAM_SIZE - 1;
-	telemetry_ipc_res[1].flags = IORESOURCE_MEM;
+	res = telemetry_res + TELEMETRY_RESOURCE_PMC_SSRAM;
+	res->start = ipcdev.telem_pmc_ssram_base;
+	res->end = res->start + ipcdev.telem_pmc_ssram_size - 1;
 
-	dev_dbg(&pdev->dev, "Telemetry res 0: %pR\n", &telemetry_ipc_res[0]);
-	dev_dbg(&pdev->dev, "Telemetry res 1: %pR\n", &telemetry_ipc_res[1]);
+	pdev = platform_device_register_full(&pdevinfo);
+	if (IS_ERR(pdev))
+		return PTR_ERR(pdev);
 
-	telemetry_cell.name = TELEMETRY_DEVICE_NAME;
-	telemetry_cell.num_resources = ARRAY_SIZE(telemetry_ipc_res);
-	telemetry_cell.resources = telemetry_ipc_res;
-	telemetry_cell.ignore_resource_conflicts = 1;
+	ipcdev.telemetry_dev = pdev;
 
-	return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
-				    &telemetry_cell, 1, NULL, 0, NULL);
+	return 0;
 }
 
-static int ipc_create_pmc_devices(struct platform_device *pdev)
+static int ipc_create_pmc_devices(void)
 {
 	int ret;
 
-	ret = ipc_create_punit_device(pdev);
-	if (ret < 0)
+	/* If we have ACPI based watchdog use that instead */
+	if (!acpi_has_watchdog()) {
+		ret = ipc_create_tco_device();
+		if (ret) {
+			dev_err(ipcdev.dev, "Failed to add tco platform device\n");
 			return ret;
+		}
+	}
 
-	ret = ipc_create_wdt_device(pdev);
-	if (ret < 0)
-		return ret;
+	ret = ipc_create_punit_device();
+	if (ret) {
+		dev_err(ipcdev.dev, "Failed to add punit platform device\n");
+		platform_device_unregister(ipcdev.tco_dev);
+	}
 
-	ret = ipc_create_telemetry_device(pdev);
-	if (ret < 0)
-		return ret;
+	if (!ipcdev.telem_res_inval) {
+		ret = ipc_create_telemetry_device();
+		if (ret)
+			dev_warn(ipcdev.dev,
+				"Failed to add telemetry platform device\n");
+	}
 
-	return 0;
+	return ret;
 }
 
 static int ipc_plat_get_res(struct platform_device *pdev)
 {
-	struct resource *res;
+	struct resource *res, *punit_res;
 	void __iomem *addr;
+	int size;
 
-	/* Get IPC resources */
+	res = platform_get_resource(pdev, IORESOURCE_IO,
+				    PLAT_RESOURCE_ACPI_IO_INDEX);
+	if (!res) {
+		dev_err(&pdev->dev, "Failed to get io resource\n");
+		return -ENXIO;
+	}
+	size = resource_size(res);
+	ipcdev.acpi_io_base = res->start;
+	ipcdev.acpi_io_size = size;
+	dev_info(&pdev->dev, "io res: %pR\n", res);
+
+	punit_res = punit_res_array;
+	/* This is index 0 to cover BIOS data register */
 	res = platform_get_resource(pdev, IORESOURCE_MEM,
-				    PLAT_RESOURCE_IPC_INDEX);
+				    PLAT_RESOURCE_BIOS_DATA_INDEX);
 	if (!res) {
-		dev_err(&pdev->dev, "Failed to get IPC resources\n");
+		dev_err(&pdev->dev, "Failed to get res of punit BIOS data\n");
 		return -ENXIO;
 	}
+	*punit_res = *res;
+	dev_info(&pdev->dev, "punit BIOS data res: %pR\n", res);
 
-	res->end = res->start +
-		   PLAT_RESOURCE_IPC_SIZE + PLAT_RESOURCE_GCR_SIZE - 1;
+	/* This is index 1 to cover BIOS interface register */
+	res = platform_get_resource(pdev, IORESOURCE_MEM,
+				    PLAT_RESOURCE_BIOS_IFACE_INDEX);
+	if (!res) {
+		dev_err(&pdev->dev, "Failed to get res of punit BIOS iface\n");
+		return -ENXIO;
+	}
+	*++punit_res = *res;
+	dev_info(&pdev->dev, "punit BIOS interface res: %pR\n", res);
+
+	/* This is index 2 to cover ISP data register, optional */
+	res = platform_get_resource(pdev, IORESOURCE_MEM,
+				    PLAT_RESOURCE_ISP_DATA_INDEX);
+	++punit_res;
+	if (res) {
+		*punit_res = *res;
+		dev_info(&pdev->dev, "punit ISP data res: %pR\n", res);
+	}
+
+	/* This is index 3 to cover ISP interface register, optional */
+	res = platform_get_resource(pdev, IORESOURCE_MEM,
+				    PLAT_RESOURCE_ISP_IFACE_INDEX);
+	++punit_res;
+	if (res) {
+		*punit_res = *res;
+		dev_info(&pdev->dev, "punit ISP interface res: %pR\n", res);
+	}
+
+	/* This is index 4 to cover GTD data register, optional */
+	res = platform_get_resource(pdev, IORESOURCE_MEM,
+				    PLAT_RESOURCE_GTD_DATA_INDEX);
+	++punit_res;
+	if (res) {
+		*punit_res = *res;
+		dev_info(&pdev->dev, "punit GTD data res: %pR\n", res);
+	}
+
+	/* This is index 5 to cover GTD interface register, optional */
+	res = platform_get_resource(pdev, IORESOURCE_MEM,
+				    PLAT_RESOURCE_GTD_IFACE_INDEX);
+	++punit_res;
+	if (res) {
+		*punit_res = *res;
+		dev_info(&pdev->dev, "punit GTD interface res: %pR\n", res);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM,
+				    PLAT_RESOURCE_IPC_INDEX);
+	if (!res) {
+		dev_err(&pdev->dev, "Failed to get ipc resource\n");
+		return -ENXIO;
+	}
+	size = PLAT_RESOURCE_IPC_SIZE + PLAT_RESOURCE_GCR_SIZE;
+	res->end = res->start + size - 1;
 
 	addr = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(addr))
 		return PTR_ERR(addr);
 
 	ipcdev.ipc_base = addr;
+
 	ipcdev.gcr_mem_base = addr + PLAT_RESOURCE_GCR_OFFSET;
-	dev_dbg(&pdev->dev, "PMC IPC resource %pR\n", res);
+	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;
 }
@@ -800,7 +911,7 @@ static int ipc_plat_probe(struct platform_device *pdev)
 
 	ipcdev.irq = platform_get_irq(pdev, 0);
 	if (ipcdev.irq < 0) {
-		dev_err(&pdev->dev, "Failed to get IRQ\n");
+		dev_err(&pdev->dev, "Failed to get irq\n");
 		return -EINVAL;
 	}
 
@@ -810,38 +921,47 @@ static int ipc_plat_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ret = ipc_create_pmc_devices(pdev);
+	ret = ipc_create_pmc_devices();
 	if (ret) {
-		dev_err(&pdev->dev, "Failed to create PMC devices\n");
+		dev_err(&pdev->dev, "Failed to create pmc devices\n");
 		return ret;
 	}
 
-	ret = devm_request_irq(&pdev->dev, ipcdev.irq, ioc, IRQF_NO_SUSPEND,
-			       "intel_pmc_ipc", &ipcdev);
-	if (ret) {
-		dev_err(&pdev->dev, "Failed to request IRQ\n");
-		return ret;
+	if (devm_request_irq(&pdev->dev, ipcdev.irq, ioc, IRQF_NO_SUSPEND,
+			     "intel_pmc_ipc", &ipcdev)) {
+		dev_err(&pdev->dev, "Failed to request irq\n");
+		ret = -EBUSY;
+		goto err_irq;
 	}
 
 	ret = sysfs_create_group(&pdev->dev.kobj, &intel_ipc_group);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to create sysfs group %d\n",
 			ret);
-		devm_free_irq(&pdev->dev, ipcdev.irq, &ipcdev);
-		return ret;
+		goto err_sys;
 	}
 
 	ipcdev.has_gcr_regs = true;
 
 	return 0;
+err_sys:
+	devm_free_irq(&pdev->dev, ipcdev.irq, &ipcdev);
+err_irq:
+	platform_device_unregister(ipcdev.tco_dev);
+	platform_device_unregister(ipcdev.punit_dev);
+	platform_device_unregister(ipcdev.telemetry_dev);
+
+	return ret;
 }
 
 static int ipc_plat_remove(struct platform_device *pdev)
 {
 	sysfs_remove_group(&pdev->dev.kobj, &intel_ipc_group);
 	devm_free_irq(&pdev->dev, ipcdev.irq, &ipcdev);
+	platform_device_unregister(ipcdev.tco_dev);
+	platform_device_unregister(ipcdev.punit_dev);
+	platform_device_unregister(ipcdev.telemetry_dev);
 	ipcdev.dev = NULL;
-
 	return 0;
 }
 
@@ -860,12 +980,12 @@ static int __init intel_pmc_ipc_init(void)
 
 	ret = platform_driver_register(&ipc_plat_driver);
 	if (ret) {
-		pr_err("Failed to register PMC IPC platform driver\n");
+		pr_err("Failed to register PMC ipc platform driver\n");
 		return ret;
 	}
 	ret = pci_register_driver(&ipc_pci_driver);
 	if (ret) {
-		pr_err("Failed to register PMC IPC PCI driver\n");
+		pr_err("Failed to register PMC ipc pci driver\n");
 		platform_driver_unregister(&ipc_plat_driver);
 		return ret;
 	}