ar71xx: optimize register access in ar724x_pci.c

[openwrt.git] / target / linux / ar71xx / files / arch / mips / pci / pci-ar71xx.c

diff --git a/target/linux/ar71xx/files/arch/mips/pci/pci-ar71xx.c b/target/linux/ar71xx/files/arch/mips/pci/pci-ar71xx.c
index f27c171..ac94da9 100644 (file)
--- a/target/linux/ar71xx/files/arch/mips/pci/pci-ar71xx.c
+++ b/target/linux/ar71xx/files/arch/mips/pci/pci-ar71xx.c
@@ -1,7 +1,7 @@
 /*
  *  Atheros AR71xx PCI host controller driver
  *
- *  Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
+ *  Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
  *
  *  Parts of this file are based on Atheros' 2.6.15 BSP
@@ -17,6 +17,7 @@
 #include <linux/bitops.h>
 #include <linux/pci.h>
 #include <linux/pci_regs.h>
+#include <linux/interrupt.h>
 
 #include <asm/mach-ar71xx/ar71xx.h>
 #include <asm/mach-ar71xx/pci.h>
@@ -36,11 +37,9 @@
 #define PCI_IDSEL_BASE 0
 #endif
 
-static unsigned ar71xx_pci_nr_irqs;
-static struct ar71xx_pci_irq *ar71xx_pci_irq_map __initdata;
 static void __iomem *ar71xx_pcicfg_base;
-
 static DEFINE_SPINLOCK(ar71xx_pci_lock);
+static int ar71xx_pci_fixup_enable;
 
 static inline void ar71xx_pci_delay(void)
 {
@@ -93,7 +92,7 @@ static inline u32 ar71xx_pci_bus_addr(struct pci_bus *bus, unsigned int devfn,
        return ret;
 }
 
-static int __ar71xx_pci_be_handler(int is_fixup)
+int ar71xx_pci_be_handler(int is_fixup)
 {
        u32 pci_err;
        u32 ahb_err;
@@ -135,7 +134,7 @@ static inline int ar71xx_pci_set_cfgaddr(struct pci_bus *bus,
        ar71xx_pcicfg_wr(PCI_REG_CFG_CBE,
                        cmd | ar71xx_pci_get_ble(where, size, 0));
 
-       return __ar71xx_pci_be_handler(1);
+       return ar71xx_pci_be_handler(1);
 }
 
 static int ar71xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
@@ -231,6 +230,9 @@ static void ar71xx_pci_fixup(struct pci_dev *dev)
 {
        u32 t;
 
+       if (!ar71xx_pci_fixup_enable)
+               return;
+
        if (dev->bus->number != 0 || dev->devfn != 0)
                return;
 
@@ -243,10 +245,10 @@ static void ar71xx_pci_fixup(struct pci_dev *dev)
 
        pci_write_config_word(dev, PCI_COMMAND, t);
 }
-
 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ar71xx_pci_fixup);
 
-int __init pcibios_map_irq(const struct pci_dev *dev, uint8_t slot, uint8_t pin)
+int __init ar71xx_pcibios_map_irq(const struct pci_dev *dev, uint8_t slot,
+                                 uint8_t pin)
 {
        int irq = -1;
        int i;
@@ -274,11 +276,6 @@ int __init pcibios_map_irq(const struct pci_dev *dev, uint8_t slot, uint8_t pin)
        return irq;
 }
 
-int pcibios_plat_dev_init(struct pci_dev *dev)
-{
-       return 0;
-}
-
 static struct pci_ops ar71xx_pci_ops = {
        .read   = ar71xx_pci_read_config,
        .write  = ar71xx_pci_write_config,
@@ -304,8 +301,74 @@ static struct pci_controller ar71xx_pci_controller = {
        .io_resource    = &ar71xx_pci_io_resource,
 };
 
-static int __init __ar71xx_pci_bios_init(unsigned nr_irqs,
-                                        struct ar71xx_pci_irq *map)
+static void ar71xx_pci_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+       u32 pending;
+
+       pending = ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_STATUS) &
+                 ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_ENABLE);
+
+       if (pending & PCI_INT_DEV0)
+               generic_handle_irq(AR71XX_PCI_IRQ_DEV0);
+
+       else if (pending & PCI_INT_DEV1)
+               generic_handle_irq(AR71XX_PCI_IRQ_DEV1);
+
+       else if (pending & PCI_INT_DEV2)
+               generic_handle_irq(AR71XX_PCI_IRQ_DEV2);
+
+       else if (pending & PCI_INT_CORE)
+               generic_handle_irq(AR71XX_PCI_IRQ_CORE);
+
+       else
+               spurious_interrupt();
+}
+
+static void ar71xx_pci_irq_unmask(unsigned int irq)
+{
+       irq -= AR71XX_PCI_IRQ_BASE;
+       ar71xx_reset_wr(AR71XX_RESET_REG_PCI_INT_ENABLE,
+               ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_ENABLE) | (1 << irq));
+
+       /* flush write */
+       ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_ENABLE);
+}
+
+static void ar71xx_pci_irq_mask(unsigned int irq)
+{
+       irq -= AR71XX_PCI_IRQ_BASE;
+       ar71xx_reset_wr(AR71XX_RESET_REG_PCI_INT_ENABLE,
+               ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_ENABLE) & ~(1 << irq));
+
+       /* flush write */
+       ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_ENABLE);
+}
+
+static struct irq_chip ar71xx_pci_irq_chip = {
+       .name           = "AR71XX PCI ",
+       .mask           = ar71xx_pci_irq_mask,
+       .unmask         = ar71xx_pci_irq_unmask,
+       .mask_ack       = ar71xx_pci_irq_mask,
+};
+
+static void __init ar71xx_pci_irq_init(void)
+{
+       int i;
+
+       ar71xx_reset_wr(AR71XX_RESET_REG_PCI_INT_ENABLE, 0);
+       ar71xx_reset_wr(AR71XX_RESET_REG_PCI_INT_STATUS, 0);
+
+       for (i = AR71XX_PCI_IRQ_BASE;
+            i < AR71XX_PCI_IRQ_BASE + AR71XX_PCI_IRQ_COUNT; i++) {
+               irq_desc[i].status = IRQ_DISABLED;
+               set_irq_chip_and_handler(i, &ar71xx_pci_irq_chip,
+                                        handle_level_irq);
+       }
+
+       set_irq_chained_handler(AR71XX_CPU_IRQ_IP2, ar71xx_pci_irq_handler);
+}
+
+int __init ar71xx_pcibios_init(void)
 {
        ar71xx_device_stop(RESET_MODULE_PCI_BUS | RESET_MODULE_PCI_CORE);
        ar71xx_pci_delay();
@@ -316,32 +379,23 @@ static int __init __ar71xx_pci_bios_init(unsigned nr_irqs,
        ar71xx_pcicfg_base = ioremap_nocache(AR71XX_PCI_CFG_BASE,
                                                AR71XX_PCI_CFG_SIZE);
 
-       ar71xx_ddr_wr(DDR_REG_PCI_WIN0, PCI_WIN0_OFFS);
-       ar71xx_ddr_wr(DDR_REG_PCI_WIN1, PCI_WIN1_OFFS);
-       ar71xx_ddr_wr(DDR_REG_PCI_WIN2, PCI_WIN2_OFFS);
-       ar71xx_ddr_wr(DDR_REG_PCI_WIN3, PCI_WIN3_OFFS);
-       ar71xx_ddr_wr(DDR_REG_PCI_WIN4, PCI_WIN4_OFFS);
-       ar71xx_ddr_wr(DDR_REG_PCI_WIN5, PCI_WIN5_OFFS);
-       ar71xx_ddr_wr(DDR_REG_PCI_WIN6, PCI_WIN6_OFFS);
-       ar71xx_ddr_wr(DDR_REG_PCI_WIN7, PCI_WIN7_OFFS);
+       ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN0, PCI_WIN0_OFFS);
+       ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN1, PCI_WIN1_OFFS);
+       ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN2, PCI_WIN2_OFFS);
+       ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN3, PCI_WIN3_OFFS);
+       ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN4, PCI_WIN4_OFFS);
+       ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN5, PCI_WIN5_OFFS);
+       ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN6, PCI_WIN6_OFFS);
+       ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN7, PCI_WIN7_OFFS);
 
        ar71xx_pci_delay();
 
        /* clear bus errors */
-       (void)__ar71xx_pci_be_handler(1);
-
-       ar71xx_pci_nr_irqs = nr_irqs;
-       ar71xx_pci_irq_map = map;
-       ar71xx_pci_be_handler = __ar71xx_pci_be_handler;
+       (void)ar71xx_pci_be_handler(1);
 
+       ar71xx_pci_fixup_enable = 1;
+       ar71xx_pci_irq_init();
        register_pci_controller(&ar71xx_pci_controller);
 
        return 0;
 }
-
-static int __init __ar71xx_pci_init(void)
-{
-       ar71xx_pci_bios_init = __ar71xx_pci_bios_init;
-       return 0;
-}
-pure_initcall(__ar71xx_pci_init);