[ar71xx] add AR7240 specific PCI code

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@16674 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 201 insertions, 0 deletions

diff --git a/target/linux/ar71xx/files/arch/mips/pci/pci-ar724x.c b/target/linux/ar71xx/files/arch/mips/pci/pci-ar724x.c
new file mode 100644
index 000000000..0f9bd2f22
--- /dev/null
+++ b/target/linux/ar71xx/files/arch/mips/pci/pci-ar724x.c
@@ -0,0 +1,201 @@
+/*
+ *  Atheros AR724x PCI host controller driver
+ *
+ *  Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
+ *
+ *  Parts of this file are based on Atheros' 2.6.15 BSP
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#include <linux/resource.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+#include <linux/pci.h>
+#include <linux/pci_regs.h>
+
+#include <asm/mach-ar71xx/ar71xx.h>
+#include <asm/mach-ar71xx/pci.h>
+
+#undef DEBUG
+#ifdef DEBUG
+#define DBG(fmt, args...)	printk(KERN_INFO fmt, ## args)
+#else
+#define DBG(fmt, args...)
+#endif
+
+static void __iomem *ar724x_pci_localcfg_base;
+static void __iomem *ar724x_pci_devcfg_base;
+
+static DEFINE_SPINLOCK(ar724x_pci_lock);
+
+static void ar724x_pci_read(void __iomem *base, int where, int size, u32 *value)
+{
+	unsigned long flags;
+	u32 data;
+
+	spin_lock_irqsave(&ar724x_pci_lock, flags);
+	data = __raw_readl(base + (where & ~3));
+
+	switch (size) {
+	case 1:
+		if (where & 1)
+			data >>= 8;
+		if (where & 2)
+			data >>= 16;
+		data &= 0xFF;
+		break;
+	case 2:
+		if (where & 2)
+			data >>= 16;
+		data &= 0xFFFF;
+		break;
+	}
+
+	*value = data;
+	spin_unlock_irqrestore(&ar724x_pci_lock, flags);
+}
+
+static void ar724x_pci_write(void __iomem *base, int where, int size, u32 value)
+{
+	unsigned long flags;
+	u32 data;
+	int s;
+
+	spin_lock_irqsave(&ar724x_pci_lock, flags);
+	data = __raw_readl(base + (where & ~3));
+
+	switch (size) {
+	case 1:
+		s = ((where & 3) << 3);
+		data &= ~(0xFF << s);
+		data |= ((value & 0xFF) << s);
+		break;
+	case 2:
+		s = ((where & 2) << 4);
+		data &= ~(0xFFFF << s);
+		data |= ((value & 0xFFFF) << s);
+		break;
+	case 4:
+		data = value;
+		break;
+	}
+
+	__raw_writel(data, base + (where & ~3));
+	/* flush write */
+	(void)__raw_readl(base + (where & ~3));
+	spin_unlock_irqrestore(&ar724x_pci_lock, flags);
+}
+
+static int ar724x_pci_read_config(struct pci_bus *bus, unsigned int devfn,
+				  int where, int size, u32 *value)
+{
+
+	if (bus->number != 0 || devfn != 0)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	ar724x_pci_read(ar724x_pci_devcfg_base, where, size, value);
+
+	DBG("PCI: read config: %02x:%02x.%01x/%02x:%01d, value=%08x\n",
+			bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
+			where, size, *value);
+
+	/*
+	 * WAR for BAR issue - We are unable to access the PCI device space
+	 * if we set the BAR with proper base address
+	 */
+	if ((where == 0x10) && (size == 4))
+		ar724x_pci_write(ar724x_pci_devcfg_base, where, size, 0xffff);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int ar724x_pci_write_config(struct pci_bus *bus, unsigned int devfn,
+				   int where, int size, u32 value)
+{
+	if (bus->number != 0 || devfn != 0)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	DBG("PCI: write config: %02x:%02x.%01x/%02x:%01d, value=%08x\n",
+		bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
+		where, size, value);
+
+	ar724x_pci_write(ar724x_pci_devcfg_base, where, size, value);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+int __init ar724x_pcibios_map_irq(const struct pci_dev *dev, uint8_t slot,
+				  uint8_t pin)
+{
+	int irq = -1;
+	int i;
+
+	for (i = 0; i < ar71xx_pci_nr_irqs; i++) {
+		struct ar71xx_pci_irq *entry;
+		entry = &ar71xx_pci_irq_map[i];
+
+		if (entry->slot == slot && entry->pin == pin) {
+			irq = entry->irq;
+			break;
+		}
+	}
+
+	if (irq < 0)
+		printk(KERN_ALERT "PCI: no irq found for pin%u@%s\n",
+				pin, pci_name((struct pci_dev *)dev));
+	else
+		printk(KERN_INFO "PCI: mapping irq %d to pin%u@%s\n",
+				irq, pin, pci_name((struct pci_dev *)dev));
+
+	return irq;
+}
+
+static struct pci_ops ar724x_pci_ops = {
+	.read	= ar724x_pci_read_config,
+	.write	= ar724x_pci_write_config,
+};
+
+static struct resource ar724x_pci_io_resource = {
+	.name		= "PCI IO space",
+	.start		= 0,
+	.end		= 0,
+	.flags		= IORESOURCE_IO,
+};
+
+static struct resource ar724x_pci_mem_resource = {
+	.name		= "PCI memory space",
+	.start		= AR71XX_PCI_MEM_BASE,
+	.end		= AR71XX_PCI_MEM_BASE + AR71XX_PCI_MEM_SIZE - 1,
+	.flags		= IORESOURCE_MEM
+};
+
+static struct pci_controller ar724x_pci_controller = {
+	.pci_ops	= &ar724x_pci_ops,
+	.mem_resource	= &ar724x_pci_mem_resource,
+	.io_resource	= &ar724x_pci_io_resource,
+};
+
+int __init ar724x_pcibios_init(void)
+{
+	u32 t;
+
+	ar724x_pci_localcfg_base = ioremap_nocache(AR724X_PCI_CRP_BASE,
+						   AR724X_PCI_CRP_SIZE);
+
+	ar724x_pci_devcfg_base = ioremap_nocache(AR724X_PCI_CFG_BASE,
+						 AR724X_PCI_CFG_SIZE);
+
+	/* setup COMMAND register */
+	t = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE |
+	    PCI_COMMAND_PARITY | PCI_COMMAND_SERR | PCI_COMMAND_FAST_BACK;
+
+	ar724x_pci_write(ar724x_pci_localcfg_base, PCI_COMMAND, 4, t);
+
+	register_pci_controller(&ar724x_pci_controller);
+
+	return 0;
+}