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author | Gabor Juhos <juhosg@openwrt.org> | 2012-01-22 22:38:11 +0000 |
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committer | Gabor Juhos <juhosg@openwrt.org> | 2012-01-22 22:38:11 +0000 |
commit | 2899e54bd7c81bb820e15e6afb8f78305ff637fb (patch) | |
tree | f60488ea3f321808d90711807b8a352e1f476b03 /target/linux/ar71xx/files-2.6.39/arch/mips/pci/pci-ar724x.c | |
parent | 31ac2df9466a254771c962d3aed989a036704e4b (diff) | |
download | master-187ad058-2899e54bd7c81bb820e15e6afb8f78305ff637fb.tar.gz master-187ad058-2899e54bd7c81bb820e15e6afb8f78305ff637fb.tar.bz2 master-187ad058-2899e54bd7c81bb820e15e6afb8f78305ff637fb.zip |
ar71xx: move arch specific files to files-2.6.39
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@29867 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/ar71xx/files-2.6.39/arch/mips/pci/pci-ar724x.c')
-rw-r--r-- | target/linux/ar71xx/files-2.6.39/arch/mips/pci/pci-ar724x.c | 389 |
1 files changed, 389 insertions, 0 deletions
diff --git a/target/linux/ar71xx/files-2.6.39/arch/mips/pci/pci-ar724x.c b/target/linux/ar71xx/files-2.6.39/arch/mips/pci/pci-ar724x.c new file mode 100644 index 0000000000..57daa06148 --- /dev/null +++ b/target/linux/ar71xx/files-2.6.39/arch/mips/pci/pci-ar724x.c @@ -0,0 +1,389 @@ +/* + * Atheros AR724x PCI host controller driver + * + * Copyright (C) 2009-2010 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 <linux/interrupt.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 void __iomem *ar724x_pci_ctrl_base; +static int ar724x_pci_fixup_enable; + +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) << 3); + 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)) { + u32 val; + val = (ar71xx_soc == AR71XX_SOC_AR7240) ? 0xffff : 0x1000ffff; + ar724x_pci_write(ar724x_pci_devcfg_base, where, size, val); + } + + 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; +} + +static void ar724x_pci_fixup(struct pci_dev *dev) +{ + u16 cmd; + + if (!ar724x_pci_fixup_enable) + return; + + if (dev->bus->number != 0 || dev->devfn != 0) + return; + + /* setup COMMAND register */ + 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, cmd); +} +DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ar724x_pci_fixup); + +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, +}; + +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(struct irq_data *d) +{ + void __iomem *base = ar724x_pci_ctrl_base; + u32 t; + + switch (d->irq) { + case AR71XX_PCI_IRQ_DEV0: + 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(struct irq_data *d) +{ + void __iomem *base = ar724x_pci_ctrl_base; + u32 t; + + switch (d->irq) { + case AR71XX_PCI_IRQ_DEV0: + 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 ", + .irq_mask = ar724x_pci_irq_mask, + .irq_unmask = ar724x_pci_irq_unmask, + .irq_mask_ack = ar724x_pci_irq_mask, +}; + +static void __init ar724x_pci_irq_init(int irq) +{ + 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_set_chip_and_handler(i, &ar724x_pci_irq_chip, + handle_level_irq); + + irq_set_chained_handler(irq, ar724x_pci_irq_handler); +} + +int __init ar724x_pcibios_init(int irq) +{ + 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; + + 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_reset(); + ret = ar724x_pci_setup(); + if (ret) + goto err_unmap_ctrl; + + ar724x_pci_fixup_enable = 1; + ar724x_pci_irq_init(irq); + 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; +} |