209 lines
6.7 KiB
C
209 lines
6.7 KiB
C
#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/mm.h>
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#include <asm/addrspace.h>
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#include <linux/vmalloc.h>
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#include <ifxmips.h>
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#include <ifxmips_irq.h>
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#include <ifxmips_cgu.h>
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#define IFXMIPS_PCI_MEM_BASE 0x18000000
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#define IFXMIPS_PCI_MEM_SIZE 0x02000000
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#define IFXMIPS_PCI_IO_BASE 0x1AE00000
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#define IFXMIPS_PCI_IO_SIZE 0x00200000
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extern int ifxmips_pci_read_config_dword(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val);
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extern int ifxmips_pci_write_config_dword(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val);
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struct pci_ops ifxmips_pci_ops =
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{
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.read = ifxmips_pci_read_config_dword,
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.write = ifxmips_pci_write_config_dword
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};
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static struct resource pci_io_resource =
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{
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.name = "io pci IO space",
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.start = IFXMIPS_PCI_IO_BASE,
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.end = IFXMIPS_PCI_IO_BASE + IFXMIPS_PCI_IO_SIZE - 1,
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.flags = IORESOURCE_IO
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};
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static struct resource pci_mem_resource =
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{
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.name = "ext pci memory space",
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.start = IFXMIPS_PCI_MEM_BASE,
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.end = IFXMIPS_PCI_MEM_BASE + IFXMIPS_PCI_MEM_SIZE - 1,
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.flags = IORESOURCE_MEM
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};
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static struct pci_controller ifxmips_pci_controller =
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{
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.pci_ops = &ifxmips_pci_ops,
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.mem_resource = &pci_mem_resource,
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.mem_offset = 0x00000000UL,
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.io_resource = &pci_io_resource,
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.io_offset = 0x00000000UL,
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};
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/* the cpu can can generate the 33Mhz or rely on an external clock the cgu needs the
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proper setting, otherwise the cpu hangs. we have no way of runtime detecting this */
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u32 ifxmips_pci_mapped_cfg;
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int ifxmips_pci_external_clock = 0;
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/* Since the PCI REQ pins can be reused for other functionality, make it possible
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to exclude those from interpretation by the PCI controller */
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int ifxmips_pci_req_mask = 0xf;
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static int __init
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ifxmips_pci_set_external_clk(char *str)
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{
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printk("cgu: setting up external pci clock\n");
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ifxmips_pci_external_clock = 1;
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return 1;
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}
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__setup("pci_external_clk", ifxmips_pci_set_external_clk);
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int
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pcibios_plat_dev_init(struct pci_dev *dev)
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{
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u8 pin;
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pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
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switch(pin)
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{
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case 0:
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break;
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case 1:
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//falling edge level triggered:0x4, low level:0xc, rising edge:0x2
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ifxmips_w32(ifxmips_r32(IFXMIPS_EBU_PCC_CON) | 0xc, IFXMIPS_EBU_PCC_CON);
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ifxmips_w32(ifxmips_r32(IFXMIPS_EBU_PCC_IEN) | 0x10, IFXMIPS_EBU_PCC_IEN);
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break;
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case 2:
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case 3:
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case 4:
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printk ("WARNING: interrupt pin %d not supported yet!\n", pin);
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default:
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printk ("WARNING: invalid interrupt pin %d\n", pin);
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return 1;
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}
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return 0;
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}
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static u32 calc_bar11mask(void)
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{
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u32 mem, bar11mask;
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/* BAR11MASK value depends on available memory on system. */
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mem = num_physpages * PAGE_SIZE;
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bar11mask = (0x0ffffff0 & ~((1 << (fls(mem) -1)) -1)) | 8;
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return bar11mask;
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}
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static void __init
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ifxmips_pci_startup(void)
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{
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u32 temp_buffer;
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cgu_setup_pci_clk(ifxmips_pci_external_clock);
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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_OUT) | (1 << 5), IFXMIPS_GPIO_P1_OUT);
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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_OD) | (1 << 5), IFXMIPS_GPIO_P1_OD);
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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_DIR) | (1 << 5), IFXMIPS_GPIO_P1_DIR);
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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_ALTSEL1) & ~(1 << 5), IFXMIPS_GPIO_P1_ALTSEL1);
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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_ALTSEL0) & ~(1 << 5), IFXMIPS_GPIO_P1_ALTSEL0);
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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_DIR) & ~0x2000, IFXMIPS_GPIO_P1_DIR);
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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_DIR) | 0x4000, IFXMIPS_GPIO_P1_DIR);
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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_ALTSEL1) & ~0x6000, IFXMIPS_GPIO_P1_ALTSEL1);
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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_ALTSEL0) | 0x6000, IFXMIPS_GPIO_P1_ALTSEL0);
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/* enable auto-switching between PCI and EBU */
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ifxmips_w32(0xa, PCI_CR_CLK_CTRL);
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/* busy, i.e. configuration is not done, PCI access has to be retried */
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ifxmips_w32(ifxmips_r32(PCI_CR_PCI_MOD) & ~(1 << 24), PCI_CR_PCI_MOD);
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wmb ();
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/* BUS Master/IO/MEM access */
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ifxmips_w32(ifxmips_r32(PCI_CS_STS_CMD) | 7, PCI_CS_STS_CMD);
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/* enable external 2 PCI masters */
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temp_buffer = ifxmips_r32(PCI_CR_PC_ARB);
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temp_buffer &= (~(ifxmips_pci_req_mask << 16));
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/* enable internal arbiter */
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temp_buffer |= (1 << INTERNAL_ARB_ENABLE_BIT);
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/* enable internal PCI master reqest */
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temp_buffer &= (~(3 << PCI_MASTER0_REQ_MASK_2BITS));
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/* enable EBU reqest */
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temp_buffer &= (~(3 << PCI_MASTER1_REQ_MASK_2BITS));
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/* enable all external masters request */
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temp_buffer &= (~(3 << PCI_MASTER2_REQ_MASK_2BITS));
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ifxmips_w32(temp_buffer, PCI_CR_PC_ARB);
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wmb ();
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ifxmips_w32(0x18000000, PCI_CR_FCI_ADDR_MAP0);
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ifxmips_w32(0x18400000, PCI_CR_FCI_ADDR_MAP1);
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ifxmips_w32(0x18800000, PCI_CR_FCI_ADDR_MAP2);
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ifxmips_w32(0x18c00000, PCI_CR_FCI_ADDR_MAP3);
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ifxmips_w32(0x19000000, PCI_CR_FCI_ADDR_MAP4);
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ifxmips_w32(0x19400000, PCI_CR_FCI_ADDR_MAP5);
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ifxmips_w32(0x19800000, PCI_CR_FCI_ADDR_MAP6);
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ifxmips_w32(0x19c00000, PCI_CR_FCI_ADDR_MAP7);
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ifxmips_w32(0x1ae00000, PCI_CR_FCI_ADDR_MAP11hg);
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ifxmips_w32(calc_bar11mask(), PCI_CR_BAR11MASK);
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ifxmips_w32(0, PCI_CR_PCI_ADDR_MAP11);
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ifxmips_w32(0, PCI_CS_BASE_ADDR1);
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#ifdef CONFIG_SWAP_IO_SPACE
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/* both TX and RX endian swap are enabled */
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ifxmips_w32(ifxmips_r32(PCI_CR_PCI_EOI) | 3, PCI_CR_PCI_EOI);
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wmb ();
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#endif
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/*TODO: disable BAR2 & BAR3 - why was this in the origianl infineon code */
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ifxmips_w32(ifxmips_r32(PCI_CR_BAR12MASK) | 0x80000000, PCI_CR_BAR12MASK);
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ifxmips_w32(ifxmips_r32(PCI_CR_BAR13MASK) | 0x80000000, PCI_CR_BAR13MASK);
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/*use 8 dw burst length */
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ifxmips_w32(0x303, PCI_CR_FCI_BURST_LENGTH);
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ifxmips_w32(ifxmips_r32(PCI_CR_PCI_MOD) | (1 << 24), PCI_CR_PCI_MOD);
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wmb();
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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_OUT) & ~(1 << 5), IFXMIPS_GPIO_P1_OUT);
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wmb();
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mdelay(1);
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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_OUT) | (1 << 5), IFXMIPS_GPIO_P1_OUT);
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}
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int __init
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pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin){
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switch(slot)
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{
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case 13:
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/* IDSEL = AD29 --> USB Host Controller */
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return (INT_NUM_IM1_IRL0 + 17);
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case 14:
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/* IDSEL = AD30 --> mini PCI connector */
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return (INT_NUM_IM0_IRL0 + 22);
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default:
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printk("Warning: no IRQ found for PCI device in slot %d, pin %d\n", slot, pin);
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return 0;
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}
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}
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int __init
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pcibios_init(void)
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{
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extern int pci_probe_only;
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pci_probe_only = 0;
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printk("PCI: Probing PCI hardware on host bus 0.\n");
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ifxmips_pci_startup ();
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ifxmips_pci_mapped_cfg = (u32)ioremap_nocache(0x17000000, 0x800 * 16);
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printk("IFXMips PCI mapped to 0x%08lX\n", (unsigned long)ifxmips_pci_mapped_cfg);
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ifxmips_pci_controller.io_map_base = (unsigned long)ioremap(IFXMIPS_PCI_IO_BASE, IFXMIPS_PCI_IO_SIZE - 1);
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printk("IFXMips PCI I/O mapped to 0x%08lX\n", (unsigned long)ifxmips_pci_controller.io_map_base);
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register_pci_controller(&ifxmips_pci_controller);
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return 0;
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}
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arch_initcall(pcibios_init);
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