#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/mach-ifxmips/cgu.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

extern int ifxmips_pci_read_config_dword(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val);
extern 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,
};

u32 ifxmips_pci_mapped_cfg;
int ifxmips_pci_external_clock = 0;

static int __init
ifxmips_pci_set_external_clk(char *str)
{
	printk("cgu: setting up external pci clock\n");
	ifxmips_pci_external_clock = 1;
	return 1;
}
__setup("pci_external_clk", ifxmips_pci_set_external_clk);

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
			ifxmips_w32(ifxmips_r32(IFXMIPS_EBU_PCC_CON) | 0xc, IFXMIPS_EBU_PCC_CON);
			ifxmips_w32(ifxmips_r32(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)
{
	u32 temp_buffer;

	cgu_setup_pci_clk(ifxmips_pci_external_clock);

	ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_OUT) | (1 << 5), IFXMIPS_GPIO_P1_OUT);
	ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_OD) | (1 << 5), IFXMIPS_GPIO_P1_OD);
	ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_DIR) | (1 << 5), IFXMIPS_GPIO_P1_DIR);
	ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_ALTSEL1) & ~(1 << 5), IFXMIPS_GPIO_P1_ALTSEL1);
	ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_ALTSEL0) & ~(1 << 5), IFXMIPS_GPIO_P1_ALTSEL0);
	ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_DIR) & ~0x2000, IFXMIPS_GPIO_P1_DIR);
	ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_DIR) | 0x4000, IFXMIPS_GPIO_P1_DIR);
	ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_ALTSEL1) & ~0x6000, IFXMIPS_GPIO_P1_ALTSEL1);
	ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_ALTSEL0) | 0x6000, IFXMIPS_GPIO_P1_ALTSEL0);
	/* enable auto-switching between PCI and EBU */
	ifxmips_w32(0xa, PCI_CR_CLK_CTRL);
	/* busy, i.e. configuration is not done, PCI access has to be retried */
	ifxmips_w32(ifxmips_r32(PCI_CR_PCI_MOD) & ~(1 << 24), PCI_CR_PCI_MOD);
	wmb ();
	/* BUS Master/IO/MEM access */
	ifxmips_w32(ifxmips_r32(PCI_CS_STS_CMD) | 7, PCI_CS_STS_CMD);

	/* enable external 2 PCI masters */
	temp_buffer = ifxmips_r32(PCI_CR_PC_ARB);
	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));
	ifxmips_w32(temp_buffer, PCI_CR_PC_ARB);
	wmb ();

	ifxmips_w32(0x18000000, PCI_CR_FCI_ADDR_MAP0);
	ifxmips_w32(0x18400000, PCI_CR_FCI_ADDR_MAP1);
	ifxmips_w32(0x18800000, PCI_CR_FCI_ADDR_MAP2);
	ifxmips_w32(0x18c00000, PCI_CR_FCI_ADDR_MAP3);
	ifxmips_w32(0x19000000, PCI_CR_FCI_ADDR_MAP4);
	ifxmips_w32(0x19400000, PCI_CR_FCI_ADDR_MAP5);
	ifxmips_w32(0x19800000, PCI_CR_FCI_ADDR_MAP6);
	ifxmips_w32(0x19c00000, PCI_CR_FCI_ADDR_MAP7);
	ifxmips_w32(0x1ae00000, PCI_CR_FCI_ADDR_MAP11hg);
	ifxmips_w32(0x0e000008, PCI_CR_BAR11MASK);
	ifxmips_w32(0, PCI_CR_PCI_ADDR_MAP11);
	ifxmips_w32(0, PCI_CS_BASE_ADDR1);
#ifdef CONFIG_SWAP_IO_SPACE
	/* both TX and RX endian swap are enabled */
	ifxmips_w32(ifxmips_r32(PCI_CR_PCI_EOI) | 3, PCI_CR_PCI_EOI);
	wmb ();
#endif
	/*TODO: disable BAR2 & BAR3 - why was this in the origianl infineon code */
	ifxmips_w32(ifxmips_r32(PCI_CR_BAR12MASK) | 0x80000000, PCI_CR_BAR12MASK);
	ifxmips_w32(ifxmips_r32(PCI_CR_BAR13MASK) | 0x80000000, PCI_CR_BAR13MASK);
	/*use 8 dw burst length */
	ifxmips_w32(0x303, PCI_CR_FCI_BURST_LENGTH);
	ifxmips_w32(ifxmips_r32(PCI_CR_PCI_MOD) | (1 << 24), PCI_CR_PCI_MOD);
	wmb();
	ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_OUT) & ~(1 << 5), IFXMIPS_GPIO_P1_OUT);
	wmb();
	mdelay(1);
	ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P1_OUT) | (1 << 5), IFXMIPS_GPIO_P1_OUT);
}

int __init
pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 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_IM0_IRL0 + 22);
		default:
			printk("Warning: no IRQ found for PCI device in slot %d, pin %d\n", slot, pin);
			return 0;
	}
}

int __init
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_mapped_cfg = (u32)ioremap_nocache(0x17000000, 0x800 * 16);
	printk("IFXMips PCI mapped to 0x%08lX\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%08lX\n", (unsigned long)ifxmips_pci_controller.io_map_base);
	register_pci_controller(&ifxmips_pci_controller);
	return 0;
}

arch_initcall(pcibios_init);