diff options
Diffstat (limited to 'target/linux/adm8668/files/arch/mips/adm8668/pci.c')
| -rw-r--r-- | target/linux/adm8668/files/arch/mips/adm8668/pci.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/target/linux/adm8668/files/arch/mips/adm8668/pci.c b/target/linux/adm8668/files/arch/mips/adm8668/pci.c new file mode 100644 index 000000000..2bf119297 --- /dev/null +++ b/target/linux/adm8668/files/arch/mips/adm8668/pci.c @@ -0,0 +1,171 @@ +/* + * Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us> + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/types.h> +#include <asm/byteorder.h> +#include <asm/pci.h> +#include <adm8668.h> + +volatile u32* pci_config_address_reg = (volatile u32*)KSEG1ADDR(PCICFG_BASE); +volatile u32* pci_config_data_reg = (volatile u32*)KSEG1ADDR(PCIDAT_BASE); + +#define PCI_ENABLE 0x80000000 +#define ADMPCI_IO_BASE 0x12600000 +#define ADMPCI_IO_SIZE 0x1fffff +#define ADMPCI_MEM_BASE 0x16000000 +#define ADMPCI_MEM_SIZE 0x7ffffff +#define PCI_CMM_IOACC_EN 0x1 +#define PCI_CMM_MEMACC_EN 0x2 +#define PCI_CMM_MASTER_EN 0x4 +#define PCI_CMM_DEF (PCI_CMM_IOACC_EN | PCI_CMM_MEMACC_EN | PCI_CMM_MASTER_EN) + +#define PCI_DEF_CACHE_LINE_SZ 0 +#define PCI_DEF_LATENCY_TIMER 0x20 +#define PCI_DEF_CACHE_LATENCY ((PCI_DEF_LATENCY_TIMER << 8) | PCI_DEF_CACHE_LINE_SZ) + + +#define cfgaddr(bus, devfn, where) ( \ + (bus ? ((bus->number & 0xff) << 0x10) : 0) | \ + ((devfn & 0xff) << 0x08) | \ + (where & 0xfc)) | PCI_ENABLE + +/* assumed little endian */ +static int adm8668_read_config(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 *val) +{ + switch (size) + { + case 1: + *pci_config_address_reg = cfgaddr(bus, devfn, where); + *val = (le32_to_cpu(*pci_config_data_reg) >> ((where&3)<<3)) & 0xff; + break; + case 2: + if (where & 1) + return PCIBIOS_BAD_REGISTER_NUMBER; + *pci_config_address_reg = cfgaddr(bus, devfn, where); + *val = (le32_to_cpu(*pci_config_data_reg) >> ((where&3)<<3)) & 0xffff; + break; + case 4: + if (where & 3) + return PCIBIOS_BAD_REGISTER_NUMBER; + *pci_config_address_reg = cfgaddr(bus, devfn, where); + *val = le32_to_cpu(*pci_config_data_reg); + break; + } + + return PCIBIOS_SUCCESSFUL; +} + +static int adm8668_write_config(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 val) +{ + switch (size) + { + case 1: + *pci_config_address_reg = cfgaddr(bus, devfn, where); + *(volatile u8 *)(((int)pci_config_data_reg) + (where & 3)) = val; + break; + case 2: + if (where & 1) + return PCIBIOS_BAD_REGISTER_NUMBER; + *pci_config_address_reg = cfgaddr(bus, devfn, where); + *(volatile u16 *)(((int)pci_config_data_reg) + (where & 2)) = val; + break; + case 4: + if (where & 3) + return PCIBIOS_BAD_REGISTER_NUMBER; + *pci_config_address_reg = cfgaddr(bus, devfn, where); + *pci_config_data_reg = (val); + } + + return PCIBIOS_SUCCESSFUL; +} + + +struct pci_ops adm8668_pci_ops = { + .read = adm8668_read_config, + .write = adm8668_write_config +}; + + +struct resource pciioport_resource = { + .name = "adm8668_pci", + .start = ADMPCI_IO_BASE, + .end = ADMPCI_IO_BASE + ADMPCI_IO_SIZE, + .flags = IORESOURCE_IO +}; + + +struct resource pciiomem_resource = { + .name = "adm8668_pci", + .start = ADMPCI_MEM_BASE, + .end = ADMPCI_MEM_BASE + ADMPCI_MEM_SIZE, + .flags = IORESOURCE_MEM +}; + +#ifdef CONFIG_ADM8668_DISABLE_PCI +struct pci_controller mips_pci_channels[] = { + { NULL, NULL, NULL , NULL , NULL} +}; +#else +struct pci_controller mips_pci_channels = { + .pci_ops = &adm8668_pci_ops, + .io_resource = &pciioport_resource, + .mem_resource = &pciiomem_resource, +}; +#endif + +int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) +{ + switch (slot) + { + case 1: + return 14; + case 2: + return 13; + case 3: + return 12; + default: + return dev->irq; + } +} + +int pcibios_plat_dev_init(struct pci_dev *dev) +{ + return 0; +} + +static int __init adm8668_pci_init(void) +{ + void __iomem *io_map_base; + + printk("adm8668_pci_init()\n"); + + /* what's an io port? this is MIPS... *shrug* */ + ioport_resource.start = ADMPCI_IO_BASE; + ioport_resource.end = ADMPCI_IO_BASE + ADMPCI_IO_SIZE; + + io_map_base = ioremap(ADMPCI_IO_BASE, ADMPCI_IO_SIZE); + if (!io_map_base) + printk("io_map_base didn't work.\n"); + mips_pci_channels.io_map_base = (unsigned long)io_map_base; + register_pci_controller(&mips_pci_channels); + + /* this needed? linksys' gpl 2.4 did it... */ + adm8668_write_config(NULL, 0, PCI_CACHE_LINE_SIZE, 2, 0); + adm8668_write_config(NULL, 0, PCI_BASE_ADDRESS_0, 4, 0); + adm8668_write_config(NULL, 0, PCI_BASE_ADDRESS_1, 4, 0); + adm8668_write_config(NULL, 0, PCI_COMMAND, 4, PCI_CMM_DEF); + + return 0; +} + +arch_initcall(adm8668_pci_init); |