diff options
Diffstat (limited to 'arch/mips/pci/pci-ar724x.c')
| -rw-r--r-- | arch/mips/pci/pci-ar724x.c | 304 |
1 files changed, 217 insertions, 87 deletions
diff --git a/arch/mips/pci/pci-ar724x.c b/arch/mips/pci/pci-ar724x.c index c11c75be2d7..8a0700d448f 100644 --- a/arch/mips/pci/pci-ar724x.c +++ b/arch/mips/pci/pci-ar724x.c @@ -9,19 +9,13 @@ * by the Free Software Foundation. */ +#include <linux/spinlock.h> #include <linux/irq.h> #include <linux/pci.h> +#include <linux/module.h> +#include <linux/platform_device.h> #include <asm/mach-ath79/ath79.h> #include <asm/mach-ath79/ar71xx_regs.h> -#include <asm/mach-ath79/pci.h> - -#define AR724X_PCI_CFG_BASE 0x14000000 -#define AR724X_PCI_CFG_SIZE 0x1000 -#define AR724X_PCI_CTRL_BASE (AR71XX_APB_BASE + 0x000f0000) -#define AR724X_PCI_CTRL_SIZE 0x100 - -#define AR724X_PCI_MEM_BASE 0x10000000 -#define AR724X_PCI_MEM_SIZE 0x04000000 #define AR724X_PCI_REG_RESET 0x18 #define AR724X_PCI_REG_INT_STATUS 0x4c @@ -35,38 +29,112 @@ #define AR7240_BAR0_WAR_VALUE 0xffff -static DEFINE_SPINLOCK(ar724x_pci_lock); -static void __iomem *ar724x_pci_devcfg_base; -static void __iomem *ar724x_pci_ctrl_base; +#define AR724X_PCI_CMD_INIT (PCI_COMMAND_MEMORY | \ + PCI_COMMAND_MASTER | \ + PCI_COMMAND_INVALIDATE | \ + PCI_COMMAND_PARITY | \ + PCI_COMMAND_SERR | \ + PCI_COMMAND_FAST_BACK) + +struct ar724x_pci_controller { + void __iomem *devcfg_base; + void __iomem *ctrl_base; + void __iomem *crp_base; + + int irq; + int irq_base; + + bool link_up; + bool bar0_is_cached; + u32 bar0_value; -static u32 ar724x_pci_bar0_value; -static bool ar724x_pci_bar0_is_cached; -static bool ar724x_pci_link_up; + spinlock_t lock; -static inline bool ar724x_pci_check_link(void) + struct pci_controller pci_controller; + struct resource io_res; + struct resource mem_res; +}; + +static inline bool ar724x_pci_check_link(struct ar724x_pci_controller *apc) { u32 reset; - reset = __raw_readl(ar724x_pci_ctrl_base + AR724X_PCI_REG_RESET); + reset = __raw_readl(apc->ctrl_base + AR724X_PCI_REG_RESET); return reset & AR724X_PCI_RESET_LINK_UP; } +static inline struct ar724x_pci_controller * +pci_bus_to_ar724x_controller(struct pci_bus *bus) +{ + struct pci_controller *hose; + + hose = (struct pci_controller *) bus->sysdata; + return container_of(hose, struct ar724x_pci_controller, pci_controller); +} + +static int ar724x_pci_local_write(struct ar724x_pci_controller *apc, + int where, int size, u32 value) +{ + unsigned long flags; + void __iomem *base; + u32 data; + int s; + + WARN_ON(where & (size - 1)); + + if (!apc->link_up) + return PCIBIOS_DEVICE_NOT_FOUND; + + base = apc->crp_base; + + spin_lock_irqsave(&apc->lock, flags); + data = __raw_readl(base + (where & ~3)); + + switch (size) { + case 1: + s = ((where & 3) * 8); + data &= ~(0xff << s); + data |= ((value & 0xff) << s); + break; + case 2: + s = ((where & 2) * 8); + data &= ~(0xffff << s); + data |= ((value & 0xffff) << s); + break; + case 4: + data = value; + break; + default: + spin_unlock_irqrestore(&apc->lock, flags); + return PCIBIOS_BAD_REGISTER_NUMBER; + } + + __raw_writel(data, base + (where & ~3)); + /* flush write */ + __raw_readl(base + (where & ~3)); + spin_unlock_irqrestore(&apc->lock, flags); + + return PCIBIOS_SUCCESSFUL; +} + static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, uint32_t *value) { + struct ar724x_pci_controller *apc; unsigned long flags; void __iomem *base; u32 data; - if (!ar724x_pci_link_up) + apc = pci_bus_to_ar724x_controller(bus); + if (!apc->link_up) return PCIBIOS_DEVICE_NOT_FOUND; if (devfn) return PCIBIOS_DEVICE_NOT_FOUND; - base = ar724x_pci_devcfg_base; + base = apc->devcfg_base; - spin_lock_irqsave(&ar724x_pci_lock, flags); + spin_lock_irqsave(&apc->lock, flags); data = __raw_readl(base + (where & ~3)); switch (size) { @@ -85,17 +153,17 @@ static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where, case 4: break; default: - spin_unlock_irqrestore(&ar724x_pci_lock, flags); + spin_unlock_irqrestore(&apc->lock, flags); return PCIBIOS_BAD_REGISTER_NUMBER; } - spin_unlock_irqrestore(&ar724x_pci_lock, flags); + spin_unlock_irqrestore(&apc->lock, flags); if (where == PCI_BASE_ADDRESS_0 && size == 4 && - ar724x_pci_bar0_is_cached) { + apc->bar0_is_cached) { /* use the cached value */ - *value = ar724x_pci_bar0_value; + *value = apc->bar0_value; } else { *value = data; } @@ -106,12 +174,14 @@ static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where, static int ar724x_pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, uint32_t value) { + struct ar724x_pci_controller *apc; unsigned long flags; void __iomem *base; u32 data; int s; - if (!ar724x_pci_link_up) + apc = pci_bus_to_ar724x_controller(bus); + if (!apc->link_up) return PCIBIOS_DEVICE_NOT_FOUND; if (devfn) @@ -129,18 +199,18 @@ static int ar724x_pci_write(struct pci_bus *bus, unsigned int devfn, int where, * BAR0 register in order to make the device memory * accessible. */ - ar724x_pci_bar0_is_cached = true; - ar724x_pci_bar0_value = value; + apc->bar0_is_cached = true; + apc->bar0_value = value; value = AR7240_BAR0_WAR_VALUE; } else { - ar724x_pci_bar0_is_cached = false; + apc->bar0_is_cached = false; } } - base = ar724x_pci_devcfg_base; + base = apc->devcfg_base; - spin_lock_irqsave(&ar724x_pci_lock, flags); + spin_lock_irqsave(&apc->lock, flags); data = __raw_readl(base + (where & ~3)); switch (size) { @@ -158,7 +228,7 @@ static int ar724x_pci_write(struct pci_bus *bus, unsigned int devfn, int where, data = value; break; default: - spin_unlock_irqrestore(&ar724x_pci_lock, flags); + spin_unlock_irqrestore(&apc->lock, flags); return PCIBIOS_BAD_REGISTER_NUMBER; } @@ -166,7 +236,7 @@ static int ar724x_pci_write(struct pci_bus *bus, unsigned int devfn, int where, __raw_writel(data, base + (where & ~3)); /* flush write */ __raw_readl(base + (where & ~3)); - spin_unlock_irqrestore(&ar724x_pci_lock, flags); + spin_unlock_irqrestore(&apc->lock, flags); return PCIBIOS_SUCCESSFUL; } @@ -176,38 +246,20 @@ static struct pci_ops ar724x_pci_ops = { .write = ar724x_pci_write, }; -static struct resource ar724x_io_resource = { - .name = "PCI IO space", - .start = 0, - .end = 0, - .flags = IORESOURCE_IO, -}; - -static struct resource ar724x_mem_resource = { - .name = "PCI memory space", - .start = AR724X_PCI_MEM_BASE, - .end = AR724X_PCI_MEM_BASE + AR724X_PCI_MEM_SIZE - 1, - .flags = IORESOURCE_MEM, -}; - -static struct pci_controller ar724x_pci_controller = { - .pci_ops = &ar724x_pci_ops, - .io_resource = &ar724x_io_resource, - .mem_resource = &ar724x_mem_resource, -}; - static void ar724x_pci_irq_handler(unsigned int irq, struct irq_desc *desc) { + struct ar724x_pci_controller *apc; void __iomem *base; u32 pending; - base = ar724x_pci_ctrl_base; + apc = irq_get_handler_data(irq); + base = apc->ctrl_base; 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(ATH79_PCI_IRQ(0)); + generic_handle_irq(apc->irq_base + 0); else spurious_interrupt(); @@ -215,13 +267,17 @@ static void ar724x_pci_irq_handler(unsigned int irq, struct irq_desc *desc) static void ar724x_pci_irq_unmask(struct irq_data *d) { + struct ar724x_pci_controller *apc; void __iomem *base; + int offset; u32 t; - base = ar724x_pci_ctrl_base; + apc = irq_data_get_irq_chip_data(d); + base = apc->ctrl_base; + offset = apc->irq_base - d->irq; - switch (d->irq) { - case ATH79_PCI_IRQ(0): + switch (offset) { + case 0: t = __raw_readl(base + AR724X_PCI_REG_INT_MASK); __raw_writel(t | AR724X_PCI_INT_DEV0, base + AR724X_PCI_REG_INT_MASK); @@ -232,13 +288,17 @@ static void ar724x_pci_irq_unmask(struct irq_data *d) static void ar724x_pci_irq_mask(struct irq_data *d) { + struct ar724x_pci_controller *apc; void __iomem *base; + int offset; u32 t; - base = ar724x_pci_ctrl_base; + apc = irq_data_get_irq_chip_data(d); + base = apc->ctrl_base; + offset = apc->irq_base - d->irq; - switch (d->irq) { - case ATH79_PCI_IRQ(0): + switch (offset) { + case 0: t = __raw_readl(base + AR724X_PCI_REG_INT_MASK); __raw_writel(t & ~AR724X_PCI_INT_DEV0, base + AR724X_PCI_REG_INT_MASK); @@ -262,53 +322,123 @@ static struct irq_chip ar724x_pci_irq_chip = { .irq_mask_ack = ar724x_pci_irq_mask, }; -static void __init ar724x_pci_irq_init(int irq) +static void ar724x_pci_irq_init(struct ar724x_pci_controller *apc, + int id) { void __iomem *base; int i; - base = ar724x_pci_ctrl_base; + base = apc->ctrl_base; __raw_writel(0, base + AR724X_PCI_REG_INT_MASK); __raw_writel(0, base + AR724X_PCI_REG_INT_STATUS); - BUILD_BUG_ON(ATH79_PCI_IRQ_COUNT < AR724X_PCI_IRQ_COUNT); + apc->irq_base = ATH79_PCI_IRQ_BASE + (id * AR724X_PCI_IRQ_COUNT); - for (i = ATH79_PCI_IRQ_BASE; - i < ATH79_PCI_IRQ_BASE + AR724X_PCI_IRQ_COUNT; i++) + for (i = apc->irq_base; + i < apc->irq_base + AR724X_PCI_IRQ_COUNT; i++) { irq_set_chip_and_handler(i, &ar724x_pci_irq_chip, handle_level_irq); + irq_set_chip_data(i, apc); + } - irq_set_chained_handler(irq, ar724x_pci_irq_handler); + irq_set_handler_data(apc->irq, apc); + irq_set_chained_handler(apc->irq, ar724x_pci_irq_handler); } -int __init ar724x_pcibios_init(int irq) +static int ar724x_pci_probe(struct platform_device *pdev) { - int ret; + struct ar724x_pci_controller *apc; + struct resource *res; + int id; - ret = -ENOMEM; + id = pdev->id; + if (id == -1) + id = 0; - ar724x_pci_devcfg_base = ioremap(AR724X_PCI_CFG_BASE, - AR724X_PCI_CFG_SIZE); - if (ar724x_pci_devcfg_base == NULL) - goto err; + apc = devm_kzalloc(&pdev->dev, sizeof(struct ar724x_pci_controller), + GFP_KERNEL); + if (!apc) + return -ENOMEM; - ar724x_pci_ctrl_base = ioremap(AR724X_PCI_CTRL_BASE, - AR724X_PCI_CTRL_SIZE); - if (ar724x_pci_ctrl_base == NULL) - goto err_unmap_devcfg; + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl_base"); + if (!res) + return -EINVAL; - ar724x_pci_link_up = ar724x_pci_check_link(); - if (!ar724x_pci_link_up) - pr_warn("ar724x: PCIe link is down\n"); + apc->ctrl_base = devm_request_and_ioremap(&pdev->dev, res); + if (apc->ctrl_base == NULL) + return -EBUSY; - ar724x_pci_irq_init(irq); - register_pci_controller(&ar724x_pci_controller); + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg_base"); + if (!res) + return -EINVAL; - return PCIBIOS_SUCCESSFUL; + apc->devcfg_base = devm_request_and_ioremap(&pdev->dev, res); + if (!apc->devcfg_base) + return -EBUSY; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "crp_base"); + if (!res) + return -EINVAL; -err_unmap_devcfg: - iounmap(ar724x_pci_devcfg_base); -err: - return ret; + apc->crp_base = devm_request_and_ioremap(&pdev->dev, res); + if (apc->crp_base == NULL) + return -EBUSY; + + apc->irq = platform_get_irq(pdev, 0); + if (apc->irq < 0) + return -EINVAL; + + spin_lock_init(&apc->lock); + + 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; + + apc->pci_controller.pci_ops = &ar724x_pci_ops; + apc->pci_controller.io_resource = &apc->io_res; + apc->pci_controller.mem_resource = &apc->mem_res; + + apc->link_up = ar724x_pci_check_link(apc); + if (!apc->link_up) + dev_warn(&pdev->dev, "PCIe link is down\n"); + + ar724x_pci_irq_init(apc, id); + + ar724x_pci_local_write(apc, PCI_COMMAND, 4, AR724X_PCI_CMD_INIT); + + register_pci_controller(&apc->pci_controller); + + return 0; } + +static struct platform_driver ar724x_pci_driver = { + .probe = ar724x_pci_probe, + .driver = { + .name = "ar724x-pci", + .owner = THIS_MODULE, + }, +}; + +static int __init ar724x_pci_init(void) +{ + return platform_driver_register(&ar724x_pci_driver); +} + +postcore_initcall(ar724x_pci_init); |