diff options
Diffstat (limited to 'arch/mips/pci/pci-ar71xx.c')
| -rw-r--r-- | arch/mips/pci/pci-ar71xx.c | 404 |
1 files changed, 404 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..bdf87b436 --- /dev/null +++ b/arch/mips/pci/pci-ar71xx.c @@ -0,0 +1,404 @@ +/* + * 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/init.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(struct irq_desc *desc) +{ + struct ar71xx_pci_controller *apc; + void __iomem *base = ath79_reset_base; + u32 pending; + + apc = irq_desc_get_handler_data(desc); + + 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_chained_handler_and_data(apc->irq, ar71xx_pci_irq_handler, + apc); +} + +static void ar71xx_pci_reset(void) +{ + 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); + + ath79_ddr_set_pci_windows(); + 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); |