diff options
author | Rene Bolldorf <xsecute@googlemail.com> | 2011-11-17 14:25:09 (GMT) |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2011-12-07 22:02:47 (GMT) |
commit | 4ff40d5a7668cfadcfc37c3982caea940ba60d8d (patch) | |
tree | ae3b4246070494db1bb50d99d732f721b97cb7b1 /arch/mips/pci | |
parent | 7e0dde175e5c06c31624e7fb88975eee683d6894 (diff) | |
download | linux-4ff40d5a7668cfadcfc37c3982caea940ba60d8d.tar.xz |
MIPS: Initial PCI support for Atheros 724x SoCs.
[ralf@linux-mips.org: Fixed the odd formatting of all break statements.]
Signed-off-by: Rene Bolldorf <xsecute@googlemail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/3019/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/pci')
-rw-r--r-- | arch/mips/pci/Makefile | 1 | ||||
-rw-r--r-- | arch/mips/pci/pci-ath724x.c | 174 |
2 files changed, 175 insertions, 0 deletions
diff --git a/arch/mips/pci/Makefile b/arch/mips/pci/Makefile index bb82cbd..19cfe04 100644 --- a/arch/mips/pci/Makefile +++ b/arch/mips/pci/Makefile @@ -19,6 +19,7 @@ obj-$(CONFIG_BCM47XX) += pci-bcm47xx.o obj-$(CONFIG_BCM63XX) += pci-bcm63xx.o fixup-bcm63xx.o \ ops-bcm63xx.o obj-$(CONFIG_MIPS_ALCHEMY) += pci-alchemy.o +obj-$(CONFIG_SOC_AR724X) += pci-ath724x.o # # These are still pretty much in the old state, watch, go blind. diff --git a/arch/mips/pci/pci-ath724x.c b/arch/mips/pci/pci-ath724x.c new file mode 100644 index 0000000..a4dd24a --- /dev/null +++ b/arch/mips/pci/pci-ath724x.c @@ -0,0 +1,174 @@ +/* + * Atheros 724x PCI support + * + * Copyright (C) 2011 René Bolldorf <xsecute@googlemail.com> + * + * 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/pci.h> +#include <asm/mach-ath79/pci-ath724x.h> + +#define reg_read(_phys) (*(unsigned int *) KSEG1ADDR(_phys)) +#define reg_write(_phys, _val) ((*(unsigned int *) KSEG1ADDR(_phys)) = (_val)) + +#define ATH724X_PCI_DEV_BASE 0x14000000 +#define ATH724X_PCI_MEM_BASE 0x10000000 +#define ATH724X_PCI_MEM_SIZE 0x08000000 + +static DEFINE_SPINLOCK(ath724x_pci_lock); +static struct ath724x_pci_data *pci_data; +static int pci_data_size; + +static int ath724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where, + int size, uint32_t *value) +{ + unsigned long flags, addr, tval, mask; + + if (devfn) + return PCIBIOS_DEVICE_NOT_FOUND; + + if (where & (size - 1)) + return PCIBIOS_BAD_REGISTER_NUMBER; + + spin_lock_irqsave(&ath724x_pci_lock, flags); + + switch (size) { + case 1: + addr = where & ~3; + mask = 0xff000000 >> ((where % 4) * 8); + tval = reg_read(ATH724X_PCI_DEV_BASE + addr); + tval = tval & ~mask; + *value = (tval >> ((4 - (where % 4))*8)); + break; + case 2: + addr = where & ~3; + mask = 0xffff0000 >> ((where % 4)*8); + tval = reg_read(ATH724X_PCI_DEV_BASE + addr); + tval = tval & ~mask; + *value = (tval >> ((4 - (where % 4))*8)); + break; + case 4: + *value = reg_read(ATH724X_PCI_DEV_BASE + where); + break; + default: + spin_unlock_irqrestore(&ath724x_pci_lock, flags); + + return PCIBIOS_BAD_REGISTER_NUMBER; + } + + spin_unlock_irqrestore(&ath724x_pci_lock, flags); + + return PCIBIOS_SUCCESSFUL; +} + +static int ath724x_pci_write(struct pci_bus *bus, unsigned int devfn, int where, + int size, uint32_t value) +{ + unsigned long flags, tval, addr, mask; + + if (devfn) + return PCIBIOS_DEVICE_NOT_FOUND; + + if (where & (size - 1)) + return PCIBIOS_BAD_REGISTER_NUMBER; + + spin_lock_irqsave(&ath724x_pci_lock, flags); + + switch (size) { + case 1: + addr = (ATH724X_PCI_DEV_BASE + where) & ~3; + mask = 0xff000000 >> ((where % 4)*8); + tval = reg_read(addr); + tval = tval & ~mask; + tval |= (value << ((4 - (where % 4))*8)) & mask; + reg_write(addr, tval); + break; + case 2: + addr = (ATH724X_PCI_DEV_BASE + where) & ~3; + mask = 0xffff0000 >> ((where % 4)*8); + tval = reg_read(addr); + tval = tval & ~mask; + tval |= (value << ((4 - (where % 4))*8)) & mask; + reg_write(addr, tval); + break; + case 4: + reg_write((ATH724X_PCI_DEV_BASE + where), value); + break; + default: + spin_unlock_irqrestore(&ath724x_pci_lock, flags); + + return PCIBIOS_BAD_REGISTER_NUMBER; + } + + spin_unlock_irqrestore(&ath724x_pci_lock, flags); + + return PCIBIOS_SUCCESSFUL; +} + +static struct pci_ops ath724x_pci_ops = { + .read = ath724x_pci_read, + .write = ath724x_pci_write, +}; + +static struct resource ath724x_io_resource = { + .name = "PCI IO space", + .start = 0, + .end = 0, + .flags = IORESOURCE_IO, +}; + +static struct resource ath724x_mem_resource = { + .name = "PCI memory space", + .start = ATH724X_PCI_MEM_BASE, + .end = ATH724X_PCI_MEM_BASE + ATH724X_PCI_MEM_SIZE - 1, + .flags = IORESOURCE_MEM, +}; + +static struct pci_controller ath724x_pci_controller = { + .pci_ops = &ath724x_pci_ops, + .io_resource = &ath724x_io_resource, + .mem_resource = &ath724x_mem_resource, +}; + +void ath724x_pci_add_data(struct ath724x_pci_data *data, int size) +{ + pci_data = data; + pci_data_size = size; +} + +int __init pcibios_map_irq(const struct pci_dev *dev, uint8_t slot, uint8_t pin) +{ + unsigned int devfn = dev->devfn; + int irq = -1; + + if (devfn > pci_data_size - 1) + return irq; + + irq = pci_data[devfn].irq; + + return irq; +} + +int pcibios_plat_dev_init(struct pci_dev *dev) +{ + unsigned int devfn = dev->devfn; + + if (devfn > pci_data_size - 1) + return PCIBIOS_DEVICE_NOT_FOUND; + + dev->dev.platform_data = pci_data[devfn].pdata; + + return PCIBIOS_SUCCESSFUL; +} + +static int __init ath724x_pcibios_init(void) +{ + register_pci_controller(&ath724x_pci_controller); + + return PCIBIOS_SUCCESSFUL; +} + +arch_initcall(ath724x_pcibios_init); |