mfd: lpc_sch: Add support for Intel Quark X1000

Intel Quark X1000 SoC supports IRQ based GPIO. This patch will
enable MFD support for Quark X1000 and provide IRQ resources
to Quark X1000 GPIO device driver.

Signed-off-by: Chang Rebecca Swee Fun <rebecca.swee.fun.chang@intel.com>
Tested-by: Chang Rebecca Swee Fun <rebecca.swee.fun.chang@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/lpc_sch.c

@@ -37,6 +37,9 @@
 #define GPIO_IO_SIZE	64
 #define GPIO_IO_SIZE_CENTERTON	128
 
+/* Intel Quark X1000 GPIO IRQ Number */
+#define GPIO_IRQ_QUARK_X1000	9
+
 #define WDTBASE		0x84
 #define WDT_IO_SIZE	64
 
@@ -44,28 +47,37 @@ enum sch_chipsets {
 	LPC_SCH = 0,		/* Intel Poulsbo SCH */
 	LPC_ITC,		/* Intel Tunnel Creek */
 	LPC_CENTERTON,		/* Intel Centerton */
+	LPC_QUARK_X1000,	/* Intel Quark X1000 */
 };
 
 struct lpc_sch_info {
 	unsigned int io_size_smbus;
 	unsigned int io_size_gpio;
 	unsigned int io_size_wdt;
+	int irq_gpio;
 };
 
 static struct lpc_sch_info sch_chipset_info[] = {
 	[LPC_SCH] = {
 		.io_size_smbus = SMBUS_IO_SIZE,
 		.io_size_gpio = GPIO_IO_SIZE,
+		.irq_gpio = -1,
 	},
 	[LPC_ITC] = {
 		.io_size_smbus = SMBUS_IO_SIZE,
 		.io_size_gpio = GPIO_IO_SIZE,
 		.io_size_wdt = WDT_IO_SIZE,
+		.irq_gpio = -1,
 	},
 	[LPC_CENTERTON] = {
 		.io_size_smbus = SMBUS_IO_SIZE,
 		.io_size_gpio = GPIO_IO_SIZE_CENTERTON,
 		.io_size_wdt = WDT_IO_SIZE,
+		.irq_gpio = -1,
+	},
+	[LPC_QUARK_X1000] = {
+		.io_size_gpio = GPIO_IO_SIZE,
+		.irq_gpio = GPIO_IRQ_QUARK_X1000,
 	},
 };
 
@@ -73,6 +85,7 @@ static const struct pci_device_id lpc_sch_ids[] = {
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC), LPC_SCH },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC), LPC_ITC },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_CENTERTON_ILB), LPC_CENTERTON },
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_QUARK_X1000_ILB), LPC_QUARK_X1000 },
 	{ 0, }
 };
 MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
@@ -110,13 +123,13 @@ static int lpc_sch_get_io(struct pci_dev *pdev, int where, const char *name,
 }
 
 static int lpc_sch_populate_cell(struct pci_dev *pdev, int where,
-				 const char *name, int size, int id,
-				 struct mfd_cell *cell)
+				 const char *name, int size, int irq,
+				 int id, struct mfd_cell *cell)
 {
 	struct resource *res;
 	int ret;
 
-	res = devm_kzalloc(&pdev->dev, sizeof(*res), GFP_KERNEL);
+	res = devm_kcalloc(&pdev->dev, 2, sizeof(*res), GFP_KERNEL);
 	if (!res)
 		return -ENOMEM;
 
@@ -132,6 +145,18 @@ static int lpc_sch_populate_cell(struct pci_dev *pdev, int where,
 	cell->ignore_resource_conflicts = true;
 	cell->id = id;
 
+	/* Check if we need to add an IRQ resource */
+	if (irq < 0)
+		return 0;
+
+	res++;
+
+	res->start = irq;
+	res->end = irq;
+	res->flags = IORESOURCE_IRQ;
+
+	cell->num_resources++;
+
 	return 0;
 }
 
@@ -143,7 +168,7 @@ static int lpc_sch_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	int ret;
 
 	ret = lpc_sch_populate_cell(dev, SMBASE, "isch_smbus",
-				    info->io_size_smbus,
+				    info->io_size_smbus, -1,
 				    id->device, &lpc_sch_cells[cells]);
 	if (ret < 0)
 		return ret;
@@ -151,7 +176,7 @@ static int lpc_sch_probe(struct pci_dev *dev, const struct pci_device_id *id)
 		cells++;
 
 	ret = lpc_sch_populate_cell(dev, GPIOBASE, "sch_gpio",
-				    info->io_size_gpio,
+				    info->io_size_gpio, info->irq_gpio,
 				    id->device, &lpc_sch_cells[cells]);
 	if (ret < 0)
 		return ret;
@@ -159,7 +184,7 @@ static int lpc_sch_probe(struct pci_dev *dev, const struct pci_device_id *id)
 		cells++;
 
 	ret = lpc_sch_populate_cell(dev, WDTBASE, "ie6xx_wdt",
-				    info->io_size_wdt,
+				    info->io_size_wdt, -1,
 				    id->device, &lpc_sch_cells[cells]);
 	if (ret < 0)
 		return ret;