Initial import

1 files changed, 414 insertions, 0 deletions

diff --git a/arch/mips/pci/pci-ar71xx.c b/arch/mips/pci/pci-ar71xx.c
new file mode 100644
index 000000000..9e62ad31d
--- /dev/null
+++ b/arch/mips/pci/pci-ar71xx.c
@@ -0,0 +1,414 @@
+/*
+ *  Atheros AR71xx PCI host controller driver
+ *
+ *  Copyright (C) 2008-2011 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
+ *
+ *  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 <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <asm/mach-ath79/ar71xx_regs.h>
+#include <asm/mach-ath79/ath79.h>
+
+#define AR71XX_PCI_REG_CRP_AD_CBE	0x00
+#define AR71XX_PCI_REG_CRP_WRDATA	0x04
+#define AR71XX_PCI_REG_CRP_RDDATA	0x08
+#define AR71XX_PCI_REG_CFG_AD		0x0c
+#define AR71XX_PCI_REG_CFG_CBE		0x10
+#define AR71XX_PCI_REG_CFG_WRDATA	0x14
+#define AR71XX_PCI_REG_CFG_RDDATA	0x18
+#define AR71XX_PCI_REG_PCI_ERR		0x1c
+#define AR71XX_PCI_REG_PCI_ERR_ADDR	0x20
+#define AR71XX_PCI_REG_AHB_ERR		0x24
+#define AR71XX_PCI_REG_AHB_ERR_ADDR	0x28
+
+#define AR71XX_PCI_CRP_CMD_WRITE	0x00010000
+#define AR71XX_PCI_CRP_CMD_READ		0x00000000
+#define AR71XX_PCI_CFG_CMD_READ		0x0000000a
+#define AR71XX_PCI_CFG_CMD_WRITE	0x0000000b
+
+#define AR71XX_PCI_INT_CORE		BIT(4)
+#define AR71XX_PCI_INT_DEV2		BIT(2)
+#define AR71XX_PCI_INT_DEV1		BIT(1)
+#define AR71XX_PCI_INT_DEV0		BIT(0)
+
+#define AR71XX_PCI_IRQ_COUNT		5
+
+struct ar71xx_pci_controller {
+	void __iomem *cfg_base;
+	int irq;
+	int irq_base;
+	struct pci_controller pci_ctrl;
+	struct resource io_res;
+	struct resource mem_res;
+};
+
+/* Byte lane enable bits */
+static const u8 ar71xx_pci_ble_table[4][4] = {
+	{0x0, 0xf, 0xf, 0xf},
+	{0xe, 0xd, 0xb, 0x7},
+	{0xc, 0xf, 0x3, 0xf},
+	{0xf, 0xf, 0xf, 0xf},
+};
+
+static const u32 ar71xx_pci_read_mask[8] = {
+	0, 0xff, 0xffff, 0, 0xffffffff, 0, 0, 0
+};
+
+static inline u32 ar71xx_pci_get_ble(int where, int size, int local)
+{
+	u32 t;
+
+	t = ar71xx_pci_ble_table[size & 3][where & 3];
+	BUG_ON(t == 0xf);
+	t <<= (local) ? 20 : 4;
+
+	return t;
+}
+
+static inline u32 ar71xx_pci_bus_addr(struct pci_bus *bus, unsigned int devfn,
+				      int where)
+{
+	u32 ret;
+
+	if (!bus->number) {
+		/* type 0 */
+		ret = (1 << PCI_SLOT(devfn)) | (PCI_FUNC(devfn) << 8) |
+		      (where & ~3);
+	} else {
+		/* type 1 */
+		ret = (bus->number << 16) | (PCI_SLOT(devfn) << 11) |
+		      (PCI_FUNC(devfn) << 8) | (where & ~3) | 1;
+	}
+
+	return ret;
+}
+
+static inline struct ar71xx_pci_controller *
+pci_bus_to_ar71xx_controller(struct pci_bus *bus)
+{
+	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;
+
+	pci_err = __raw_readl(base + AR71XX_PCI_REG_PCI_ERR) & 3;
+	if (pci_err) {
+		if (!quiet) {
+			u32 addr;
+
+			addr = __raw_readl(base + AR71XX_PCI_REG_PCI_ERR_ADDR);
+			pr_crit("ar71xx: %s bus error %d at addr 0x%x\n",
+				"PCI", pci_err, addr);
+		}
+
+		/* clear PCI error status */
+		__raw_writel(pci_err, base + AR71XX_PCI_REG_PCI_ERR);
+	}
+
+	ahb_err = __raw_readl(base + AR71XX_PCI_REG_AHB_ERR) & 1;
+	if (ahb_err) {
+		if (!quiet) {
+			u32 addr;
+
+			addr = __raw_readl(base + AR71XX_PCI_REG_AHB_ERR_ADDR);
+			pr_crit("ar71xx: %s bus error %d at addr 0x%x\n",
+				"AHB", ahb_err, addr);
+		}
+
+		/* clear AHB error status */
+		__raw_writel(ahb_err, base + AR71XX_PCI_REG_AHB_ERR);
+	}
+
+	return !!(ahb_err | pci_err);
+}
+
+static inline void ar71xx_pci_local_write(struct ar71xx_pci_controller *apc,
+					  int where, int size, u32 value)
+{
+	void __iomem *base = apc->cfg_base;
+	u32 ad_cbe;
+
+	value = value << (8 * (where & 3));
+
+	ad_cbe = AR71XX_PCI_CRP_CMD_WRITE | (where & ~3);
+	ad_cbe |= ar71xx_pci_get_ble(where, size, 1);
+
+	__raw_writel(ad_cbe, base + AR71XX_PCI_REG_CRP_AD_CBE);
+	__raw_writel(value, base + AR71XX_PCI_REG_CRP_WRDATA);
+}
+
+static inline int ar71xx_pci_set_cfgaddr(struct pci_bus *bus,
+					 unsigned int devfn,
+					 int where, int size, u32 cmd)
+{
+	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);
+
+	__raw_writel(addr, base + AR71XX_PCI_REG_CFG_AD);
+	__raw_writel(cmd | ar71xx_pci_get_ble(where, size, 0),
+		     base + AR71XX_PCI_REG_CFG_CBE);
+
+	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)
+{
+	struct ar71xx_pci_controller *apc = pci_bus_to_ar71xx_controller(bus);
+	void __iomem *base = apc->cfg_base;
+	u32 data;
+	int err;
+	int ret;
+
+	ret = PCIBIOS_SUCCESSFUL;
+	data = ~0;
+
+	err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
+				     AR71XX_PCI_CFG_CMD_READ);
+	if (err)
+		ret = PCIBIOS_DEVICE_NOT_FOUND;
+	else
+		data = __raw_readl(base + AR71XX_PCI_REG_CFG_RDDATA);
+
+	*value = (data >> (8 * (where & 3))) & ar71xx_pci_read_mask[size & 7];
+
+	return ret;
+}
+
+static int ar71xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
+				   int where, int size, u32 value)
+{
+	struct ar71xx_pci_controller *apc = pci_bus_to_ar71xx_controller(bus);
+	void __iomem *base = apc->cfg_base;
+	int err;
+	int ret;
+
+	value = value << (8 * (where & 3));
+	ret = PCIBIOS_SUCCESSFUL;
+
+	err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
+				     AR71XX_PCI_CFG_CMD_WRITE);
+	if (err)
+		ret = PCIBIOS_DEVICE_NOT_FOUND;
+	else
+		__raw_writel(value, base + AR71XX_PCI_REG_CFG_WRDATA);
+
+	return ret;
+}
+
+static struct pci_ops ar71xx_pci_ops = {
+	.read	= ar71xx_pci_read_config,
+	.write	= ar71xx_pci_write_config,
+};
+
+static void ar71xx_pci_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct ar71xx_pci_controller *apc;
+	void __iomem *base = ath79_reset_base;
+	u32 pending;
+
+	apc = irq_get_handler_data(irq);
+
+	pending = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_STATUS) &
+		  __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
+
+	if (pending & AR71XX_PCI_INT_DEV0)
+		generic_handle_irq(apc->irq_base + 0);
+
+	else if (pending & AR71XX_PCI_INT_DEV1)
+		generic_handle_irq(apc->irq_base + 1);
+
+	else if (pending & AR71XX_PCI_INT_DEV2)
+		generic_handle_irq(apc->irq_base + 2);
+
+	else if (pending & AR71XX_PCI_INT_CORE)
+		generic_handle_irq(apc->irq_base + 4);
+
+	else
+		spurious_interrupt();
+}
+
+static void ar71xx_pci_irq_unmask(struct irq_data *d)
+{
+	struct ar71xx_pci_controller *apc;
+	unsigned int irq;
+	void __iomem *base = ath79_reset_base;
+	u32 t;
+
+	apc = irq_data_get_irq_chip_data(d);
+	irq = d->irq - apc->irq_base;
+
+	t = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
+	__raw_writel(t | (1 << irq), base + AR71XX_RESET_REG_PCI_INT_ENABLE);
+
+	/* flush write */
+	__raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
+}
+
+static void ar71xx_pci_irq_mask(struct irq_data *d)
+{
+	struct ar71xx_pci_controller *apc;
+	unsigned int irq;
+	void __iomem *base = ath79_reset_base;
+	u32 t;
+
+	apc = irq_data_get_irq_chip_data(d);
+	irq = d->irq - apc->irq_base;
+
+	t = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
+	__raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_PCI_INT_ENABLE);
+
+	/* flush write */
+	__raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
+}
+
+static struct irq_chip ar71xx_pci_irq_chip = {
+	.name		= "AR71XX PCI",
+	.irq_mask	= ar71xx_pci_irq_mask,
+	.irq_unmask	= ar71xx_pci_irq_unmask,
+	.irq_mask_ack	= ar71xx_pci_irq_mask,
+};
+
+static void ar71xx_pci_irq_init(struct ar71xx_pci_controller *apc)
+{
+	void __iomem *base = ath79_reset_base;
+	int i;
+
+	__raw_writel(0, base + AR71XX_RESET_REG_PCI_INT_ENABLE);
+	__raw_writel(0, base + AR71XX_RESET_REG_PCI_INT_STATUS);
+
+	BUILD_BUG_ON(ATH79_PCI_IRQ_COUNT < AR71XX_PCI_IRQ_COUNT);
+
+	apc->irq_base = ATH79_PCI_IRQ_BASE;
+	for (i = apc->irq_base;
+	     i < apc->irq_base + AR71XX_PCI_IRQ_COUNT; i++) {
+		irq_set_chip_and_handler(i, &ar71xx_pci_irq_chip,
+					 handle_level_irq);
+		irq_set_chip_data(i, apc);
+	}
+
+	irq_set_handler_data(apc->irq, apc);
+	irq_set_chained_handler(apc->irq, ar71xx_pci_irq_handler);
+}
+
+static void ar71xx_pci_reset(void)
+{
+	void __iomem *ddr_base = ath79_ddr_base;
+
+	ath79_device_reset_set(AR71XX_RESET_PCI_BUS | AR71XX_RESET_PCI_CORE);
+	mdelay(100);
+
+	ath79_device_reset_clear(AR71XX_RESET_PCI_BUS | AR71XX_RESET_PCI_CORE);
+	mdelay(100);
+
+	__raw_writel(AR71XX_PCI_WIN0_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN0);
+	__raw_writel(AR71XX_PCI_WIN1_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN1);
+	__raw_writel(AR71XX_PCI_WIN2_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN2);
+	__raw_writel(AR71XX_PCI_WIN3_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN3);
+	__raw_writel(AR71XX_PCI_WIN4_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN4);
+	__raw_writel(AR71XX_PCI_WIN5_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN5);
+	__raw_writel(AR71XX_PCI_WIN6_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN6);
+	__raw_writel(AR71XX_PCI_WIN7_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN7);
+
+	mdelay(100);
+}
+
+static int ar71xx_pci_probe(struct platform_device *pdev)
+{
+	struct ar71xx_pci_controller *apc;
+	struct resource *res;
+	u32 t;
+
+	apc = devm_kzalloc(&pdev->dev, sizeof(struct ar71xx_pci_controller),
+			   GFP_KERNEL);
+	if (!apc)
+		return -ENOMEM;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg_base");
+	apc->cfg_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(apc->cfg_base))
+		return PTR_ERR(apc->cfg_base);
+
+	apc->irq = platform_get_irq(pdev, 0);
+	if (apc->irq < 0)
+		return -EINVAL;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_IO, "io_base");
+	if (!res)
+		return -EINVAL;
+
+	apc->io_res.parent = res;
+	apc->io_res.name = "PCI IO space";
+	apc->io_res.start = res->start;
+	apc->io_res.end = res->end;
+	apc->io_res.flags = IORESOURCE_IO;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem_base");
+	if (!res)
+		return -EINVAL;
+
+	apc->mem_res.parent = res;
+	apc->mem_res.name = "PCI memory space";
+	apc->mem_res.start = res->start;
+	apc->mem_res.end = res->end;
+	apc->mem_res.flags = IORESOURCE_MEM;
+
+	ar71xx_pci_reset();
+
+	/* 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(apc, PCI_COMMAND, 4, t);
+
+	/* clear bus errors */
+	ar71xx_pci_check_error(apc, 1);
+
+	ar71xx_pci_irq_init(apc);
+
+	apc->pci_ctrl.pci_ops = &ar71xx_pci_ops;
+	apc->pci_ctrl.mem_resource = &apc->mem_res;
+	apc->pci_ctrl.io_resource = &apc->io_res;
+
+	register_pci_controller(&apc->pci_ctrl);
+
+	return 0;
+}
+
+static struct platform_driver ar71xx_pci_driver = {
+	.probe = ar71xx_pci_probe,
+	.driver = {
+		.name = "ar71xx-pci",
+	},
+};
+
+static int __init ar71xx_pci_init(void)
+{
+	return platform_driver_register(&ar71xx_pci_driver);
+}
+
+postcore_initcall(ar71xx_pci_init);