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openwrt-xburst/target/linux/ar71xx/patches-3.3/153-MIPS-pci-ar71xx-use-dynamically-allocated-PCI-contro.patch
juhosg 97e6f60806 ar71xx: refactor PCI code to allow registering multiple PCI controllers 
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@32605 3c298f89-4303-0410-b956-a3cf2f4a3e73
2012-07-05 08:26:45 +00:00

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From 6c3ef689e4364dca74eaaecd72384be09e5a6bc8 Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Mon, 25 Jun 2012 09:19:08 +0200
Subject: [PATCH 14/34] MIPS: pci-ar71xx: use dynamically allocated PCI controller structure
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
---
arch/mips/pci/pci-ar71xx.c | 84 +++++++++++++++++++++++++++----------------
1 files changed, 53 insertions(+), 31 deletions(-)
--- a/arch/mips/pci/pci-ar71xx.c
+++ b/arch/mips/pci/pci-ar71xx.c
@@ -20,6 +20,7 @@
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
+#include <linux/slab.h>
#include <asm/mach-ath79/ar71xx_regs.h>
#include <asm/mach-ath79/ath79.h>
@@ -48,8 +49,12 @@
#define AR71XX_PCI_IRQ_COUNT 5
-static DEFINE_SPINLOCK(ar71xx_pci_lock);
-static void __iomem *ar71xx_pcicfg_base;
+struct ar71xx_pci_controller {
+ void __iomem *cfg_base;
+ spinlock_t lock;
+ int irq;
+ struct pci_controller pci_ctrl;
+};
/* Byte lane enable bits */
static const u8 ar71xx_pci_ble_table[4][4] = {
@@ -92,9 +97,18 @@ static inline u32 ar71xx_pci_bus_addr(st
return ret;
}
-static int ar71xx_pci_check_error(int quiet)
+static inline struct ar71xx_pci_controller *
+pci_bus_to_ar71xx_controller(struct pci_bus *bus)
{
- void __iomem *base = ar71xx_pcicfg_base;
+ struct pci_controller *hose;
+
+ hose = (struct pci_controller *) bus->sysdata;
+ return container_of(hose, struct ar71xx_pci_controller, pci_ctrl);
+}
+
+static int ar71xx_pci_check_error(struct ar71xx_pci_controller *apc, int quiet)
+{
+ void __iomem *base = apc->cfg_base;
u32 pci_err;
u32 ahb_err;
@@ -129,9 +143,10 @@ static int ar71xx_pci_check_error(int qu
return !!(ahb_err | pci_err);
}
-static inline void ar71xx_pci_local_write(int where, int size, u32 value)
+static inline void ar71xx_pci_local_write(struct ar71xx_pci_controller *apc,
+ int where, int size, u32 value)
{
- void __iomem *base = ar71xx_pcicfg_base;
+ void __iomem *base = apc->cfg_base;
u32 ad_cbe;
value = value << (8 * (where & 3));
@@ -147,7 +162,8 @@ static inline int ar71xx_pci_set_cfgaddr
unsigned int devfn,
int where, int size, u32 cmd)
{
- void __iomem *base = ar71xx_pcicfg_base;
+ struct ar71xx_pci_controller *apc = pci_bus_to_ar71xx_controller(bus);
+ void __iomem *base = apc->cfg_base;
u32 addr;
addr = ar71xx_pci_bus_addr(bus, devfn, where);
@@ -156,13 +172,14 @@ static inline int ar71xx_pci_set_cfgaddr
__raw_writel(cmd | ar71xx_pci_get_ble(where, size, 0),
base + AR71XX_PCI_REG_CFG_CBE);
- return ar71xx_pci_check_error(1);
+ return ar71xx_pci_check_error(apc, 1);
}
static int ar71xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *value)
{
- void __iomem *base = ar71xx_pcicfg_base;
+ struct ar71xx_pci_controller *apc = pci_bus_to_ar71xx_controller(bus);
+ void __iomem *base = apc->cfg_base;
unsigned long flags;
u32 data;
int err;
@@ -171,7 +188,7 @@ static int ar71xx_pci_read_config(struct
ret = PCIBIOS_SUCCESSFUL;
data = ~0;
- spin_lock_irqsave(&ar71xx_pci_lock, flags);
+ spin_lock_irqsave(&apc->lock, flags);
err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
AR71XX_PCI_CFG_CMD_READ);
@@ -180,7 +197,7 @@ static int ar71xx_pci_read_config(struct
else
data = __raw_readl(base + AR71XX_PCI_REG_CFG_RDDATA);
- spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
+ spin_unlock_irqrestore(&apc->lock, flags);
*value = (data >> (8 * (where & 3))) & ar71xx_pci_read_mask[size & 7];
@@ -190,7 +207,8 @@ static int ar71xx_pci_read_config(struct
static int ar71xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 value)
{
- void __iomem *base = ar71xx_pcicfg_base;
+ struct ar71xx_pci_controller *apc = pci_bus_to_ar71xx_controller(bus);
+ void __iomem *base = apc->cfg_base;
unsigned long flags;
int err;
int ret;
@@ -198,7 +216,7 @@ static int ar71xx_pci_write_config(struc
value = value << (8 * (where & 3));
ret = PCIBIOS_SUCCESSFUL;
- spin_lock_irqsave(&ar71xx_pci_lock, flags);
+ spin_lock_irqsave(&apc->lock, flags);
err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
AR71XX_PCI_CFG_CMD_WRITE);
@@ -207,7 +225,7 @@ static int ar71xx_pci_write_config(struc
else
__raw_writel(value, base + AR71XX_PCI_REG_CFG_WRDATA);
- spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
+ spin_unlock_irqrestore(&apc->lock, flags);
return ret;
}
@@ -231,12 +249,6 @@ static struct resource ar71xx_pci_mem_re
.flags = IORESOURCE_MEM
};
-static struct pci_controller ar71xx_pci_controller = {
- .pci_ops = &ar71xx_pci_ops,
- .mem_resource = &ar71xx_pci_mem_resource,
- .io_resource = &ar71xx_pci_io_resource,
-};
-
static void ar71xx_pci_irq_handler(unsigned int irq, struct irq_desc *desc)
{
void __iomem *base = ath79_reset_base;
@@ -294,7 +306,7 @@ static struct irq_chip ar71xx_pci_irq_ch
.irq_mask_ack = ar71xx_pci_irq_mask,
};
-static __devinit void ar71xx_pci_irq_init(int irq)
+static __devinit void ar71xx_pci_irq_init(struct ar71xx_pci_controller *apc)
{
void __iomem *base = ath79_reset_base;
int i;
@@ -309,7 +321,7 @@ static __devinit void ar71xx_pci_irq_ini
irq_set_chip_and_handler(i, &ar71xx_pci_irq_chip,
handle_level_irq);
- irq_set_chained_handler(irq, ar71xx_pci_irq_handler);
+ irq_set_chained_handler(apc->irq, ar71xx_pci_irq_handler);
}
static __devinit void ar71xx_pci_reset(void)
@@ -336,20 +348,26 @@ static __devinit void ar71xx_pci_reset(v
static int __devinit ar71xx_pci_probe(struct platform_device *pdev)
{
+ struct ar71xx_pci_controller *apc;
struct resource *res;
- int irq;
u32 t;
+ apc = kzalloc(sizeof(struct ar71xx_pci_controller), GFP_KERNEL);
+ if (!apc)
+ return -ENOMEM;
+
+ spin_lock_init(&apc->lock);
+
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg_base");
if (!res)
return -EINVAL;
- ar71xx_pcicfg_base = devm_request_and_ioremap(&pdev->dev, res);
- if (!ar71xx_pcicfg_base)
+ apc->cfg_base = devm_request_and_ioremap(&pdev->dev, res);
+ if (!apc->cfg_base)
return -ENOMEM;
- irq = platform_get_irq(pdev, 0);
- if (irq < 0)
+ apc->irq = platform_get_irq(pdev, 0);
+ if (apc->irq < 0)
return -EINVAL;
ar71xx_pci_reset();
@@ -357,14 +375,18 @@ static int __devinit ar71xx_pci_probe(st
/* setup COMMAND register */
t = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE
| PCI_COMMAND_PARITY | PCI_COMMAND_SERR | PCI_COMMAND_FAST_BACK;
- ar71xx_pci_local_write(PCI_COMMAND, 4, t);
+ ar71xx_pci_local_write(apc, PCI_COMMAND, 4, t);
/* clear bus errors */
- ar71xx_pci_check_error(1);
+ ar71xx_pci_check_error(apc, 1);
+
+ ar71xx_pci_irq_init(apc);
- ar71xx_pci_irq_init(irq);
+ apc->pci_ctrl.pci_ops = &ar71xx_pci_ops;
+ apc->pci_ctrl.mem_resource = &ar71xx_pci_mem_resource;
+ apc->pci_ctrl.io_resource = &ar71xx_pci_io_resource;
- register_pci_controller(&ar71xx_pci_controller);
+ register_pci_controller(&apc->pci_ctrl);
return 0;
}
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