X-Git-Url: https://git.rohieb.name/openwrt.git/blobdiff_plain/4f961361c67ed753665460cedf06a660adfc8610..1ff112ddd2ee9f48859bf09e96289acb20bd6ac1:/target/linux/ar71xx/files/arch/mips/pci/pci-ar724x.c diff --git a/target/linux/ar71xx/files/arch/mips/pci/pci-ar724x.c b/target/linux/ar71xx/files/arch/mips/pci/pci-ar724x.c index 139af940a..b63980619 100644 --- a/target/linux/ar71xx/files/arch/mips/pci/pci-ar724x.c +++ b/target/linux/ar71xx/files/arch/mips/pci/pci-ar724x.c @@ -1,7 +1,7 @@ /* * Atheros AR724x PCI host controller driver * - * Copyright (C) 2009 Gabor Juhos + * Copyright (C) 2009-2010 Gabor Juhos * * Parts of this file are based on Atheros' 2.6.15 BSP * @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -29,6 +30,7 @@ static void __iomem *ar724x_pci_localcfg_base; static void __iomem *ar724x_pci_devcfg_base; +static void __iomem *ar724x_pci_ctrl_base; static int ar724x_pci_fixup_enable; static DEFINE_SPINLOCK(ar724x_pci_lock); @@ -108,8 +110,12 @@ static int ar724x_pci_read_config(struct pci_bus *bus, unsigned int devfn, * 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); + if ((where == 0x10) && (size == 4)) { + if (ar71xx_soc == AR71XX_SOC_AR7240) + ar724x_pci_write(ar724x_pci_devcfg_base, where, size, 0xffff); + else + ar724x_pci_write(ar724x_pci_devcfg_base, where, size, 0x1000ffff); + } return PCIBIOS_SUCCESSFUL; } @@ -131,7 +137,7 @@ static int ar724x_pci_write_config(struct pci_bus *bus, unsigned int devfn, static void ar724x_pci_fixup(struct pci_dev *dev) { - u32 t; + u16 cmd; if (!ar724x_pci_fixup_enable) return; @@ -139,14 +145,13 @@ static void ar724x_pci_fixup(struct pci_dev *dev) if (dev->bus->number != 0 || dev->devfn != 0) return; - DBG("PCI: fixup host controller %s (%04x:%04x)\n", pci_name(dev), - dev->vendor, dev->device); - /* setup COMMAND register */ - t = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE - | PCI_COMMAND_PARITY | PCI_COMMAND_SERR | PCI_COMMAND_FAST_BACK; + pci_read_config_word(dev, PCI_COMMAND, &cmd); + cmd |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | + PCI_COMMAND_INVALIDATE | PCI_COMMAND_PARITY | PCI_COMMAND_SERR | + PCI_COMMAND_FAST_BACK; - pci_write_config_word(dev, PCI_COMMAND, t); + pci_write_config_word(dev, PCI_COMMAND, cmd); } DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ar724x_pci_fixup); @@ -201,24 +206,190 @@ static struct pci_controller ar724x_pci_controller = { .io_resource = &ar724x_pci_io_resource, }; -int __init ar724x_pcibios_init(void) +static void __init ar724x_pci_reset(void) +{ + ar71xx_device_stop(AR724X_RESET_PCIE); + ar71xx_device_stop(AR724X_RESET_PCIE_PHY); + ar71xx_device_stop(AR724X_RESET_PCIE_PHY_SERIAL); + udelay(100); + + ar71xx_device_start(AR724X_RESET_PCIE_PHY_SERIAL); + udelay(100); + ar71xx_device_start(AR724X_RESET_PCIE_PHY); + ar71xx_device_start(AR724X_RESET_PCIE); +} + +static int __init ar724x_pci_setup(void) +{ + void __iomem *base = ar724x_pci_ctrl_base; + u32 t; + + /* 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); + ar724x_pci_write(ar724x_pci_localcfg_base, 0x20, 4, 0x1ff01000); + ar724x_pci_write(ar724x_pci_localcfg_base, 0x24, 4, 0x1ff01000); + + t = __raw_readl(base + AR724X_PCI_REG_RESET); + if (t != 0x7) { + udelay(100000); + __raw_writel(0, base + AR724X_PCI_REG_RESET); + udelay(100); + __raw_writel(4, base + AR724X_PCI_REG_RESET); + udelay(100000); + } + + if (ar71xx_soc == AR71XX_SOC_AR7240) + t = AR724X_PCI_APP_LTSSM_ENABLE; + else + t = 0x1ffc1; + __raw_writel(t, base + AR724X_PCI_REG_APP); + /* flush write */ + (void) __raw_readl(base + AR724X_PCI_REG_APP); + udelay(1000); + + t = __raw_readl(base + AR724X_PCI_REG_RESET); + if ((t & AR724X_PCI_RESET_LINK_UP) == 0x0) { + printk(KERN_WARNING "PCI: no PCIe module found\n"); + return -ENODEV; + } + + if (ar71xx_soc == AR71XX_SOC_AR7241 || ar71xx_soc == AR71XX_SOC_AR7242) { + t = __raw_readl(base + AR724X_PCI_REG_APP); + t |= BIT(16); + __raw_writel(t, base + AR724X_PCI_REG_APP); + } + + return 0; +} + +static void ar724x_pci_irq_handler(unsigned int irq, struct irq_desc *desc) +{ + void __iomem *base = ar724x_pci_ctrl_base; + u32 pending; + + pending = __raw_readl(base + AR724X_PCI_REG_INT_STATUS) & + __raw_readl(base + AR724X_PCI_REG_INT_MASK); + + if (pending & AR724X_PCI_INT_DEV0) + generic_handle_irq(AR71XX_PCI_IRQ_DEV0); + + else + spurious_interrupt(); +} + +static void ar724x_pci_irq_unmask(unsigned int irq) +{ + void __iomem *base = ar724x_pci_ctrl_base; + u32 t; + + switch (irq) { + case AR71XX_PCI_IRQ_DEV0: + irq -= AR71XX_PCI_IRQ_BASE; + + t = __raw_readl(base + AR724X_PCI_REG_INT_MASK); + __raw_writel(t | AR724X_PCI_INT_DEV0, + base + AR724X_PCI_REG_INT_MASK); + /* flush write */ + (void) __raw_readl(base + AR724X_PCI_REG_INT_MASK); + } +} + +static void ar724x_pci_irq_mask(unsigned int irq) +{ + void __iomem *base = ar724x_pci_ctrl_base; + u32 t; + + switch (irq) { + case AR71XX_PCI_IRQ_DEV0: + irq -= AR71XX_PCI_IRQ_BASE; + + t = __raw_readl(base + AR724X_PCI_REG_INT_MASK); + __raw_writel(t & ~AR724X_PCI_INT_DEV0, + base + AR724X_PCI_REG_INT_MASK); + + /* flush write */ + (void) __raw_readl(base + AR724X_PCI_REG_INT_MASK); + + t = __raw_readl(base + AR724X_PCI_REG_INT_STATUS); + __raw_writel(t | AR724X_PCI_INT_DEV0, + base + AR724X_PCI_REG_INT_STATUS); + + /* flush write */ + (void) __raw_readl(base + AR724X_PCI_REG_INT_STATUS); + } +} + +static struct irq_chip ar724x_pci_irq_chip = { + .name = "AR724X PCI ", + .mask = ar724x_pci_irq_mask, + .unmask = ar724x_pci_irq_unmask, + .mask_ack = ar724x_pci_irq_mask, +}; + +static void __init ar724x_pci_irq_init(void) { + void __iomem *base = ar724x_pci_ctrl_base; u32 t; + int i; + + t = ar71xx_reset_rr(AR724X_RESET_REG_RESET_MODULE); + if (t & (AR724X_RESET_PCIE | AR724X_RESET_PCIE_PHY | + AR724X_RESET_PCIE_PHY_SERIAL)) { + return; + } + + __raw_writel(0, base + AR724X_PCI_REG_INT_MASK); + __raw_writel(0, base + AR724X_PCI_REG_INT_STATUS); + + 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, &ar724x_pci_irq_chip, + handle_level_irq); + } + + set_irq_chained_handler(AR71XX_CPU_IRQ_IP2, ar724x_pci_irq_handler); +} + +int __init ar724x_pcibios_init(void) +{ + int ret = -ENOMEM; ar724x_pci_localcfg_base = ioremap_nocache(AR724X_PCI_CRP_BASE, AR724X_PCI_CRP_SIZE); + if (ar724x_pci_localcfg_base == NULL) + goto err; ar724x_pci_devcfg_base = ioremap_nocache(AR724X_PCI_CFG_BASE, AR724X_PCI_CFG_SIZE); + if (ar724x_pci_devcfg_base == NULL) + goto err_unmap_localcfg; - /* 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_ctrl_base = ioremap_nocache(AR724X_PCI_CTRL_BASE, + AR724X_PCI_CTRL_SIZE); + if (ar724x_pci_ctrl_base == NULL) + goto err_unmap_devcfg; - ar724x_pci_write(ar724x_pci_localcfg_base, PCI_COMMAND, 4, t); + ar724x_pci_reset(); + ret = ar724x_pci_setup(); + if (ret) + goto err_unmap_ctrl; ar724x_pci_fixup_enable = 1; + ar724x_pci_irq_init(); register_pci_controller(&ar724x_pci_controller); return 0; + + err_unmap_ctrl: + iounmap(ar724x_pci_ctrl_base); + err_unmap_devcfg: + iounmap(ar724x_pci_devcfg_base); + err_unmap_localcfg: + iounmap(ar724x_pci_localcfg_base); + err: + return ret; }