path: root/target/linux/ar71xx/patches-3.8/017-MIPS-pci-ar724x-use-dynamically-allocated-PCI-contro.patch

From 21b3cafae425cf2e317a22292a9a5773ff0e2e5e Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Sun, 3 Feb 2013 09:58:38 +0000
Subject: [PATCH] MIPS: pci-ar724x: use dynamically allocated PCI controller
 structure

commit 908339ef25b1d5e80f1c6fab22b9958174708b4a upstream.

The current code uses static variables to store the
PCI controller specific data. This works if the system
contains one PCI controller only, however it becomes
impractical when multiple PCI controllers are present.

Move the variables into a dynamically allocated controller
specific structure, and use that instead of the static
variables.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4912/
Signed-off-by: John Crispin <blogic@openwrt.org>
---
 arch/mips/pci/pci-ar724x.c |  129 ++++++++++++++++++++++++++++----------------
 1 file changed, 82 insertions(+), 47 deletions(-)

--- a/arch/mips/pci/pci-ar724x.c
+++ b/arch/mips/pci/pci-ar724x.c
@@ -9,6 +9,7 @@
  *  by the Free Software Foundation.
  */
 
+#include <linux/spinlock.h>
 #include <linux/irq.h>
 #include <linux/pci.h>
 #include <linux/module.h>
@@ -28,38 +29,56 @@
 
 #define AR7240_BAR0_WAR_VALUE	0xffff
 
-static DEFINE_SPINLOCK(ar724x_pci_lock);
-static void __iomem *ar724x_pci_devcfg_base;
-static void __iomem *ar724x_pci_ctrl_base;
-
-static u32 ar724x_pci_bar0_value;
-static bool ar724x_pci_bar0_is_cached;
-static bool ar724x_pci_link_up;
+struct ar724x_pci_controller {
+	void __iomem *devcfg_base;
+	void __iomem *ctrl_base;
 
-static inline bool ar724x_pci_check_link(void)
+	int irq;
+
+	bool link_up;
+	bool bar0_is_cached;
+	u32  bar0_value;
+
+	spinlock_t lock;
+
+	struct pci_controller pci_controller;
+};
+
+static inline bool ar724x_pci_check_link(struct ar724x_pci_controller *apc)
 {
 	u32 reset;
 
-	reset = __raw_readl(ar724x_pci_ctrl_base + AR724X_PCI_REG_RESET);
+	reset = __raw_readl(apc->ctrl_base + AR724X_PCI_REG_RESET);
 	return reset & AR724X_PCI_RESET_LINK_UP;
 }
 
+static inline struct ar724x_pci_controller *
+pci_bus_to_ar724x_controller(struct pci_bus *bus)
+{
+	struct pci_controller *hose;
+
+	hose = (struct pci_controller *) bus->sysdata;
+	return container_of(hose, struct ar724x_pci_controller, pci_controller);
+}
+
 static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where,
 			    int size, uint32_t *value)
 {
+	struct ar724x_pci_controller *apc;
 	unsigned long flags;
 	void __iomem *base;
 	u32 data;
 
-	if (!ar724x_pci_link_up)
+	apc = pci_bus_to_ar724x_controller(bus);
+	if (!apc->link_up)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
 	if (devfn)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
-	base = ar724x_pci_devcfg_base;
+	base = apc->devcfg_base;
 
-	spin_lock_irqsave(&ar724x_pci_lock, flags);
+	spin_lock_irqsave(&apc->lock, flags);
 	data = __raw_readl(base + (where & ~3));
 
 	switch (size) {
@@ -78,17 +97,17 @@ static int ar724x_pci_read(struct pci_bu
 	case 4:
 		break;
 	default:
-		spin_unlock_irqrestore(&ar724x_pci_lock, flags);
+		spin_unlock_irqrestore(&apc->lock, flags);
 
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 	}
 
-	spin_unlock_irqrestore(&ar724x_pci_lock, flags);
+	spin_unlock_irqrestore(&apc->lock, flags);
 
 	if (where == PCI_BASE_ADDRESS_0 && size == 4 &&
-	    ar724x_pci_bar0_is_cached) {
+	    apc->bar0_is_cached) {
 		/* use the cached value */
-		*value = ar724x_pci_bar0_value;
+		*value = apc->bar0_value;
 	} else {
 		*value = data;
 	}
@@ -99,12 +118,14 @@ static int ar724x_pci_read(struct pci_bu
 static int ar724x_pci_write(struct pci_bus *bus, unsigned int devfn, int where,
 			     int size, uint32_t value)
 {
+	struct ar724x_pci_controller *apc;
 	unsigned long flags;
 	void __iomem *base;
 	u32 data;
 	int s;
 
-	if (!ar724x_pci_link_up)
+	apc = pci_bus_to_ar724x_controller(bus);
+	if (!apc->link_up)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
 	if (devfn)
@@ -122,18 +143,18 @@ static int ar724x_pci_write(struct pci_b
 			 * BAR0 register in order to make the device memory
 			 * accessible.
 			 */
-			ar724x_pci_bar0_is_cached = true;
-			ar724x_pci_bar0_value = value;
+			apc->bar0_is_cached = true;
+			apc->bar0_value = value;
 
 			value = AR7240_BAR0_WAR_VALUE;
 		} else {
-			ar724x_pci_bar0_is_cached = false;
+			apc->bar0_is_cached = false;
 		}
 	}
 
-	base = ar724x_pci_devcfg_base;
+	base = apc->devcfg_base;
 
-	spin_lock_irqsave(&ar724x_pci_lock, flags);
+	spin_lock_irqsave(&apc->lock, flags);
 	data = __raw_readl(base + (where & ~3));
 
 	switch (size) {
@@ -151,7 +172,7 @@ static int ar724x_pci_write(struct pci_b
 		data = value;
 		break;
 	default:
-		spin_unlock_irqrestore(&ar724x_pci_lock, flags);
+		spin_unlock_irqrestore(&apc->lock, flags);
 
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 	}
@@ -159,7 +180,7 @@ static int ar724x_pci_write(struct pci_b
 	__raw_writel(data, base + (where & ~3));
 	/* flush write */
 	__raw_readl(base + (where & ~3));
-	spin_unlock_irqrestore(&ar724x_pci_lock, flags);
+	spin_unlock_irqrestore(&apc->lock, flags);
 
 	return PCIBIOS_SUCCESSFUL;
 }
@@ -183,18 +204,14 @@ static struct resource ar724x_mem_resour
 	.flags  = IORESOURCE_MEM,
 };
 
-static struct pci_controller ar724x_pci_controller = {
-	.pci_ops        = &ar724x_pci_ops,
-	.io_resource    = &ar724x_io_resource,
-	.mem_resource	= &ar724x_mem_resource,
-};
-
 static void ar724x_pci_irq_handler(unsigned int irq, struct irq_desc *desc)
 {
+	struct ar724x_pci_controller *apc;
 	void __iomem *base;
 	u32 pending;
 
-	base = ar724x_pci_ctrl_base;
+	apc = irq_get_handler_data(irq);
+	base = apc->ctrl_base;
 
 	pending = __raw_readl(base + AR724X_PCI_REG_INT_STATUS) &
 		  __raw_readl(base + AR724X_PCI_REG_INT_MASK);
@@ -208,10 +225,12 @@ static void ar724x_pci_irq_handler(unsig
 
 static void ar724x_pci_irq_unmask(struct irq_data *d)
 {
+	struct ar724x_pci_controller *apc;
 	void __iomem *base;
 	u32 t;
 
-	base = ar724x_pci_ctrl_base;
+	apc = irq_data_get_irq_chip_data(d);
+	base = apc->ctrl_base;
 
 	switch (d->irq) {
 	case ATH79_PCI_IRQ(0):
@@ -225,10 +244,12 @@ static void ar724x_pci_irq_unmask(struct
 
 static void ar724x_pci_irq_mask(struct irq_data *d)
 {
+	struct ar724x_pci_controller *apc;
 	void __iomem *base;
 	u32 t;
 
-	base = ar724x_pci_ctrl_base;
+	apc = irq_data_get_irq_chip_data(d);
+	base = apc->ctrl_base;
 
 	switch (d->irq) {
 	case ATH79_PCI_IRQ(0):
@@ -255,12 +276,12 @@ static struct irq_chip ar724x_pci_irq_ch
 	.irq_mask_ack	= ar724x_pci_irq_mask,
 };
 
-static void ar724x_pci_irq_init(int irq)
+static void ar724x_pci_irq_init(struct ar724x_pci_controller *apc)
 {
 	void __iomem *base;
 	int i;
 
-	base = ar724x_pci_ctrl_base;
+	base = apc->ctrl_base;
 
 	__raw_writel(0, base + AR724X_PCI_REG_INT_MASK);
 	__raw_writel(0, base + AR724X_PCI_REG_INT_STATUS);
@@ -268,45 +289,59 @@ static void ar724x_pci_irq_init(int irq)
 	BUILD_BUG_ON(ATH79_PCI_IRQ_COUNT < AR724X_PCI_IRQ_COUNT);
 
 	for (i = ATH79_PCI_IRQ_BASE;
-	     i < ATH79_PCI_IRQ_BASE + AR724X_PCI_IRQ_COUNT; i++)
+	     i < ATH79_PCI_IRQ_BASE + AR724X_PCI_IRQ_COUNT; i++) {
 		irq_set_chip_and_handler(i, &ar724x_pci_irq_chip,
 					 handle_level_irq);
+		irq_set_chip_data(i, apc);
+	}
 
-	irq_set_chained_handler(irq, ar724x_pci_irq_handler);
+	irq_set_handler_data(apc->irq, apc);
+	irq_set_chained_handler(apc->irq, ar724x_pci_irq_handler);
 }
 
 static int ar724x_pci_probe(struct platform_device *pdev)
 {
+	struct ar724x_pci_controller *apc;
 	struct resource *res;
-	int irq;
+
+	apc = devm_kzalloc(&pdev->dev, sizeof(struct ar724x_pci_controller),
+			    GFP_KERNEL);
+	if (!apc)
+		return -ENOMEM;
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl_base");
 	if (!res)
 		return -EINVAL;
 
-	ar724x_pci_ctrl_base = devm_request_and_ioremap(&pdev->dev, res);
-	if (ar724x_pci_ctrl_base == NULL)
+	apc->ctrl_base = devm_request_and_ioremap(&pdev->dev, res);
+	if (apc->ctrl_base == NULL)
 		return -EBUSY;
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg_base");
 	if (!res)
 		return -EINVAL;
 
-	ar724x_pci_devcfg_base = devm_request_and_ioremap(&pdev->dev, res);
-	if (!ar724x_pci_devcfg_base)
+	apc->devcfg_base = devm_request_and_ioremap(&pdev->dev, res);
+	if (!apc->devcfg_base)
 		return -EBUSY;
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
+	apc->irq = platform_get_irq(pdev, 0);
+	if (apc->irq < 0)
 		return -EINVAL;
 
-	ar724x_pci_link_up = ar724x_pci_check_link();
-	if (!ar724x_pci_link_up)
+	spin_lock_init(&apc->lock);
+
+	apc->pci_controller.pci_ops = &ar724x_pci_ops;
+	apc->pci_controller.io_resource = &ar724x_io_resource;
+	apc->pci_controller.mem_resource = &ar724x_mem_resource;
+
+	apc->link_up = ar724x_pci_check_link(apc);
+	if (!apc->link_up)
 		dev_warn(&pdev->dev, "PCIe link is down\n");
 
-	ar724x_pci_irq_init(irq);
+	ar724x_pci_irq_init(apc);
 
-	register_pci_controller(&ar724x_pci_controller);
+	register_pci_controller(&apc->pci_controller);
 
 	return 0;
 }