diff options
Diffstat (limited to 'target/linux/ifxmips/files/arch/mips/ifxmips/pci.c')
| -rw-r--r-- | target/linux/ifxmips/files/arch/mips/ifxmips/pci.c | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/target/linux/ifxmips/files/arch/mips/ifxmips/pci.c b/target/linux/ifxmips/files/arch/mips/ifxmips/pci.c new file mode 100644 index 000000000..3032d87c2 --- /dev/null +++ b/target/linux/ifxmips/files/arch/mips/ifxmips/pci.c @@ -0,0 +1,319 @@ +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/mm.h> +#include <asm/ifxmips/ifxmips.h> +#include <asm/ifxmips/ifxmips_irq.h> +#include <asm/addrspace.h> +#include <linux/vmalloc.h> + +#define IFXMIPS_PCI_MEM_BASE 0x18000000 +#define IFXMIPS_PCI_MEM_SIZE 0x02000000 +#define IFXMIPS_PCI_IO_BASE 0x1AE00000 +#define IFXMIPS_PCI_IO_SIZE 0x00200000 + +#define IFXMIPS_PCI_CFG_BUSNUM_SHF 16 +#define IFXMIPS_PCI_CFG_DEVNUM_SHF 11 +#define IFXMIPS_PCI_CFG_FUNNUM_SHF 8 + +#define PCI_ACCESS_READ 0 +#define PCI_ACCESS_WRITE 1 + +static int ifxmips_pci_read_config_dword(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val); +static int ifxmips_pci_write_config_dword(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val); + +struct pci_ops ifxmips_pci_ops = { + .read = ifxmips_pci_read_config_dword, + .write = ifxmips_pci_write_config_dword +}; + +static struct resource pci_io_resource = { + .name = "io pci IO space", + .start = IFXMIPS_PCI_IO_BASE, + .end = IFXMIPS_PCI_IO_BASE + IFXMIPS_PCI_IO_SIZE - 1, + .flags = IORESOURCE_IO +}; + +static struct resource pci_mem_resource = { + .name = "ext pci memory space", + .start = IFXMIPS_PCI_MEM_BASE, + .end = IFXMIPS_PCI_MEM_BASE + IFXMIPS_PCI_MEM_SIZE - 1, + .flags = IORESOURCE_MEM +}; + +static struct pci_controller ifxmips_pci_controller = { + .pci_ops = &ifxmips_pci_ops, + .mem_resource = &pci_mem_resource, + .mem_offset = 0x00000000UL, + .io_resource = &pci_io_resource, + .io_offset = 0x00000000UL, +}; + +static u32 ifxmips_pci_mapped_cfg; + +static int +ifxmips_pci_config_access(unsigned char access_type, + struct pci_bus *bus, unsigned int devfn, unsigned int where, u32 *data) +{ + unsigned long cfg_base; + unsigned long flags; + + u32 temp; + + /* IFXMips support slot from 0 to 15 */ + /* dev_fn 0&0x68 (AD29) is ifxmips itself */ + if ((bus->number != 0) || ((devfn & 0xf8) > 0x78) + || ((devfn & 0xf8) == 0) || ((devfn & 0xf8) == 0x68)) + return 1; + + local_irq_save(flags); + + cfg_base = ifxmips_pci_mapped_cfg; + cfg_base |= (bus->number << IFXMIPS_PCI_CFG_BUSNUM_SHF) | (devfn << + IFXMIPS_PCI_CFG_FUNNUM_SHF) | (where & ~0x3); + + /* Perform access */ + if (access_type == PCI_ACCESS_WRITE) + { +#ifdef CONFIG_IFXMIPS_PCI_HW_SWAP + writel(swab32(*data), ((u32*)cfg_base)); +#else + writel(*data, ((u32*)cfg_base)); +#endif + } else { + *data = readl(((u32*)(cfg_base))); +#ifdef CONFIG_IFXMIPS_PCI_HW_SWAP + *data = swab32(*data); +#endif + } + wmb(); + + /* clean possible Master abort */ + cfg_base = (ifxmips_pci_mapped_cfg | (0x0 << IFXMIPS_PCI_CFG_FUNNUM_SHF)) + 4; + temp = readl(((u32*)(cfg_base))); +#ifdef CONFIG_IFXMIPS_PCI_HW_SWAP + temp = swab32 (temp); +#endif + cfg_base = (ifxmips_pci_mapped_cfg | (0x68 << IFXMIPS_PCI_CFG_FUNNUM_SHF)) + 4; + writel(temp, ((u32*)cfg_base)); + + local_irq_restore(flags); + + if (((*data) == 0xffffffff) && (access_type == PCI_ACCESS_READ)) + return 1; + + return 0; +} + +static int ifxmips_pci_read_config_dword(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 * val) +{ + u32 data = 0; + + if (ifxmips_pci_config_access(PCI_ACCESS_READ, bus, devfn, where, &data)) + return PCIBIOS_DEVICE_NOT_FOUND; + + if (size == 1) + *val = (data >> ((where & 3) << 3)) & 0xff; + else if (size == 2) + *val = (data >> ((where & 3) << 3)) & 0xffff; + else + *val = data; + + return PCIBIOS_SUCCESSFUL; +} + +static int ifxmips_pci_write_config_dword(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 val) +{ + u32 data = 0; + + if (size == 4) + { + data = val; + } else { + if (ifxmips_pci_config_access(PCI_ACCESS_READ, bus, devfn, where, &data)) + return PCIBIOS_DEVICE_NOT_FOUND; + + if (size == 1) + data = (data & ~(0xff << ((where & 3) << 3))) | + (val << ((where & 3) << 3)); + else if (size == 2) + data = (data & ~(0xffff << ((where & 3) << 3))) | + (val << ((where & 3) << 3)); + } + + if (ifxmips_pci_config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data)) + return PCIBIOS_DEVICE_NOT_FOUND; + + return PCIBIOS_SUCCESSFUL; +} + + +int pcibios_plat_dev_init(struct pci_dev *dev){ + u8 pin; + + pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); + + switch(pin) { + case 0: + break; + case 1: + //falling edge level triggered:0x4, low level:0xc, rising edge:0x2 + printk("%s:%s[%d] %08X \n", __FILE__, __func__, __LINE__, dev->irq); + writel(readl(IFXMIPS_EBU_PCC_CON) | 0xc, IFXMIPS_EBU_PCC_CON); + writel(readl(IFXMIPS_EBU_PCC_IEN) | 0x10, IFXMIPS_EBU_PCC_IEN); + break; + case 2: + case 3: + case 4: + printk ("WARNING: interrupt pin %d not supported yet!\n", pin); + default: + printk ("WARNING: invalid interrupt pin %d\n", pin); + return 1; + } + + return 0; +} + +static void __init ifxmips_pci_startup (void){ + /*initialize the first PCI device--ifxmips itself */ + u32 temp_buffer; + /*TODO: trigger reset */ + writel(readl(IFXMIPS_CGU_IFCCR) & ~0xf00000, IFXMIPS_CGU_IFCCR); + writel(readl(IFXMIPS_CGU_IFCCR) | 0x800000, IFXMIPS_CGU_IFCCR); + /* PCIS of IF_CLK of CGU : 1 =>PCI Clock output + 0 =>clock input + PADsel of PCI_CR of CGU : 1 =>From CGU + : 0 =>From pad + */ + writel(readl(IFXMIPS_CGU_IFCCR) | (1 << 16), IFXMIPS_CGU_IFCCR); + writel((1 << 31) | (1 << 30), IFXMIPS_CGU_PCICR); + + /* prepare GPIO */ + /* PCI_RST: P1.5 ALT 01 */ + //pliu20060613: start + writel(readl(IFXMIPS_GPIO_P1_OUT) | (1 << 5), IFXMIPS_GPIO_P1_OUT); + writel(readl(IFXMIPS_GPIO_P1_OD) | (1 << 5), IFXMIPS_GPIO_P1_OD); + writel(readl(IFXMIPS_GPIO_P1_DIR) | (1 << 5), IFXMIPS_GPIO_P1_DIR); + writel(readl(IFXMIPS_GPIO_P1_ALTSEL1) & ~(1 << 5), IFXMIPS_GPIO_P1_ALTSEL1); + writel(readl(IFXMIPS_GPIO_P1_ALTSEL0) & ~(1 << 5), IFXMIPS_GPIO_P1_ALTSEL0); + //pliu20060613: end + /* PCI_REQ1: P1.13 ALT 01 */ + /* PCI_GNT1: P1.14 ALT 01 */ + writel(readl(IFXMIPS_GPIO_P1_DIR) & ~0x2000, IFXMIPS_GPIO_P1_DIR); + writel(readl(IFXMIPS_GPIO_P1_DIR) | 0x4000, IFXMIPS_GPIO_P1_DIR); + writel(readl(IFXMIPS_GPIO_P1_ALTSEL1) & ~0x6000, IFXMIPS_GPIO_P1_ALTSEL1); + writel(readl(IFXMIPS_GPIO_P1_ALTSEL0) | 0x6000, IFXMIPS_GPIO_P1_ALTSEL0); + /* PCI_REQ2: P1.15 ALT 10 */ + /* PCI_GNT2: P1.7 ALT 10 */ + + + /* enable auto-switching between PCI and EBU */ + writel(0xa, PCI_CR_CLK_CTRL); + /* busy, i.e. configuration is not done, PCI access has to be retried */ + writel(readl(PCI_CR_PCI_MOD) & ~(1 << 24), PCI_CR_PCI_MOD); + wmb (); + /* BUS Master/IO/MEM access */ + writel(readl(PCI_CS_STS_CMD) | 7, PCI_CS_STS_CMD); + + temp_buffer = readl(PCI_CR_PC_ARB); + /* enable external 2 PCI masters */ + temp_buffer &= (~(0xf << 16)); + /* enable internal arbiter */ + temp_buffer |= (1 << INTERNAL_ARB_ENABLE_BIT); + /* enable internal PCI master reqest */ + temp_buffer &= (~(3 << PCI_MASTER0_REQ_MASK_2BITS)); + + /* enable EBU reqest */ + temp_buffer &= (~(3 << PCI_MASTER1_REQ_MASK_2BITS)); + + /* enable all external masters request */ + temp_buffer &= (~(3 << PCI_MASTER2_REQ_MASK_2BITS)); + writel(temp_buffer, PCI_CR_PC_ARB); + + wmb (); + + /* FPI ==> PCI MEM address mapping */ + /* base: 0xb8000000 == > 0x18000000 */ + /* size: 8x4M = 32M */ + writel(0x18000000, PCI_CR_FCI_ADDR_MAP0); + writel(0x18400000, PCI_CR_FCI_ADDR_MAP1); + writel(0x18800000, PCI_CR_FCI_ADDR_MAP2); + writel(0x18c00000, PCI_CR_FCI_ADDR_MAP3); + writel(0x19000000, PCI_CR_FCI_ADDR_MAP4); + writel(0x19400000, PCI_CR_FCI_ADDR_MAP5); + writel(0x19800000, PCI_CR_FCI_ADDR_MAP6); + writel(0x19c00000, PCI_CR_FCI_ADDR_MAP7); + + /* FPI ==> PCI IO address mapping */ + /* base: 0xbAE00000 == > 0xbAE00000 */ + /* size: 2M */ + writel(0xbae00000, PCI_CR_FCI_ADDR_MAP11hg); + + /* PCI ==> FPI address mapping */ + /* base: 0x0 ==> 0x0 */ + /* size: 32M */ + /* BAR1 32M map to SDR address */ + writel(0x0e000008, PCI_CR_BAR11MASK); + writel(0, PCI_CR_PCI_ADDR_MAP11); + writel(0, PCI_CS_BASE_ADDR1); +#ifdef CONFIG_IFXMIPS_PCI_HW_SWAP + /* both TX and RX endian swap are enabled */ + IFXMIPS_PCI_REG32 (PCI_CR_PCI_EOI_REG) |= 3; + wmb (); +#endif + /*TODO: disable BAR2 & BAR3 - why was this in the origianl infineon code */ + writel(readl(PCI_CR_BAR12MASK) | 0x80000000, PCI_CR_BAR12MASK); + writel(readl(PCI_CR_BAR13MASK) | 0x80000000, PCI_CR_BAR13MASK); + /*use 8 dw burse length */ + writel(0x303, PCI_CR_FCI_BURST_LENGTH); + + writel(readl(PCI_CR_PCI_MOD) | (1 << 24), PCI_CR_PCI_MOD); + wmb(); + writel(readl(IFXMIPS_GPIO_P1_OUT) & ~(1 << 5), IFXMIPS_GPIO_P1_OUT); + wmb(); + mdelay (1); + writel(readl(IFXMIPS_GPIO_P1_OUT) | (1 << 5), IFXMIPS_GPIO_P1_OUT); +} + +int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin){ + printk("\n\n\n%s:%s[%d] %d %d\n", __FILE__, __func__, __LINE__, slot, pin); + switch (slot) { + case 13: + /* IDSEL = AD29 --> USB Host Controller */ + return (INT_NUM_IM1_IRL0 + 17); + case 14: + /* IDSEL = AD30 --> mini PCI connector */ + //return (INT_NUM_IM1_IRL0 + 14); + return (INT_NUM_IM0_IRL0 + 22); + default: + printk("Warning: no IRQ found for PCI device in slot %d, pin %d\n", slot, pin); + return 0; + } +} + +int pcibios_init(void){ + extern int pci_probe_only; + + pci_probe_only = 0; + printk ("PCI: Probing PCI hardware on host bus 0.\n"); + + ifxmips_pci_startup (); + + // IFXMIPS_PCI_REG32(PCI_CR_CLK_CTRL_REG) &= (~8); + ifxmips_pci_mapped_cfg = ioremap_nocache(0x17000000, 0x800 * 16); + printk("IFXMips PCI mapped to 0x%08X\n", (unsigned long)ifxmips_pci_mapped_cfg); + + ifxmips_pci_controller.io_map_base = (unsigned long)ioremap(IFXMIPS_PCI_IO_BASE, IFXMIPS_PCI_IO_SIZE - 1); + + printk("IFXMips PCI I/O mapped to 0x%08X\n", (unsigned long)ifxmips_pci_controller.io_map_base); + + register_pci_controller(&ifxmips_pci_controller); + + return 0; +} + +arch_initcall(pcibios_init); |