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openwrt_archive/target/linux/ar71xx/patches-3.3/149-MIPS-pci-ar724x-use-dynamically-allocated-PCI-contro.patch
Gabor Juhos c3cc780b52 ar71xx: refactor PCI code to allow registering multiple PCI controllers 
SVN-Revision: 32605
2012-07-05 08:26:45 +00:00

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From 242aedf3246dc5085271aca56134ac455bfb64b5 Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Sun, 24 Jun 2012 11:51:34 +0200
Subject: [PATCH 10/34] MIPS: pci-ar724x: use dynamically allocated PCI controller structure
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
---
arch/mips/pci/pci-ar724x.c | 129 ++++++++++++++++++++++++++++----------------
1 files 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 __devinit ar724x_pci_irq_init(int irq)
+static void __devinit 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 __devinit ar724x_pci_irq_ini
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 __devinit 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;
}
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