pci_st40.c
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上传日期:2013-04-10
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- /*
- * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
- *
- * May be copied or modified under the terms of the GNU General Public
- * License. See linux/COPYING for more information.
- *
- * Support functions for the ST40 PCI hardware.
- */
- #include <linux/config.h>
- #include <linux/kernel.h>
- #include <linux/smp.h>
- #include <linux/smp_lock.h>
- #include <linux/init.h>
- #include <linux/errno.h>
- #include <linux/pci.h>
- #include <linux/delay.h>
- #include <linux/types.h>
- #include <asm/pci.h>
- #include <linux/irq.h>
- #include "pci_st40.h"
- /* This is in P2 of course */
- #define ST40PCI_BASE_ADDRESS (0xb0000000)
- #define ST40PCI_MEM_ADDRESS (ST40PCI_BASE_ADDRESS+0x0)
- #define ST40PCI_IO_ADDRESS (ST40PCI_BASE_ADDRESS+0x06000000)
- #define ST40PCI_REG_ADDRESS (ST40PCI_BASE_ADDRESS+0x07000000)
- #define ST40PCI_REG(x) (ST40PCI_REG_ADDRESS+(ST40PCI_##x))
- #define ST40PCI_WRITE(reg,val) writel((val),ST40PCI_REG(reg))
- #define ST40PCI_WRITE_SHORT(reg,val) writew((val),ST40PCI_REG(reg))
- #define ST40PCI_WRITE_BYTE(reg,val) writeb((val),ST40PCI_REG(reg))
- #define ST40PCI_READ(reg) readl(ST40PCI_REG(reg))
- #define ST40PCI_READ_SHORT(reg) readw(ST40PCI_REG(reg))
- #define ST40PCI_READ_BYTE(reg) readb(ST40PCI_REG(reg))
- #define ST40PCI_SERR_IRQ 64
- #define ST40PCI_SERR_INT_GROUP 0
- #define ST40PCI_SERR_INT_POS 0
- #define ST40PCI_SERR_INT_PRI 15
- #define ST40PCI_ERR_IRQ 65
- #define ST40PCI_ERR_INT_GROUP 1
- #define ST40PCI_ERR_INT_POS 1
- #define ST40PCI_ERR_INT_PRI 14
- /* Macros to extract PLL params */
- #define PLL_MDIV(reg) ( ((unsigned)reg) & 0xff )
- #define PLL_NDIV(reg) ( (((unsigned)reg)>>8) & 0xff )
- #define PLL_PDIV(reg) ( (((unsigned)reg)>>16) & 0x3 )
- #define PLL_SETUP(reg) ( (((unsigned)reg)>>19) & 0x1ff )
- /* Build up the appropriate settings */
- #define PLL_SET(mdiv,ndiv,pdiv,setup)
- ( ((mdiv)&0xff) | (((ndiv)&0xff)<<8) | (((pdiv)&3)<<16)| (((setup)&0x1ff)<<19))
- #define PLLPCICR (0xbb040000+0x10)
- #define PLLPCICR_POWERON (1<<28)
- #define PLLPCICR_OUT_EN (1<<29)
- #define PLLPCICR_LOCKSELECT (1<<30)
- #define PLLPCICR_LOCK (1<<31)
- #define PLL_25MHZ 0x793c8512
- #define PLL_33MHZ PLL_SET(18,88,3,295)
- static __init void SetPCIPLL(void)
- {
- /* Stop the PLL */
- writel(0, PLLPCICR);
- /* Always run at 33Mhz. The PCI clock is totally async
- * to the rest of the system
- */
- writel(PLL_33MHZ | PLLPCICR_POWERON, PLLPCICR);
- printk("ST40PCI: Waiting for PCI PLL to lockn");
- while ((readl(PLLPCICR) & PLLPCICR_LOCK) == 0);
- writel(readl(PLLPCICR) | PLLPCICR_OUT_EN, PLLPCICR);
- }
- static void st40_pci_irq(int irq, void *dev_instance, struct pt_regs *regs)
- {
- unsigned pci_int, pci_air, pci_cir, pci_aint;
- pci_int = ST40PCI_READ(INT);
- pci_cir = ST40PCI_READ(CIR);
- pci_air = ST40PCI_READ(AIR);
- if (pci_int) {
- printk("PCI INTERRUPT!n");
- printk("PCI INT -> 0x%xn", pci_int & 0xffff);
- printk("PCI AIR -> 0x%xn", pci_air);
- printk("PCI CIR -> 0x%xn", pci_cir);
- ST40PCI_WRITE(INT, ~0);
- }
- pci_aint = ST40PCI_READ(AINT);
- if (pci_aint) {
- printk("PCI ARB INTERRUPT!n");
- printk("PCI AINT -> 0x%xn", pci_aint);
- printk("PCI AIR -> 0x%xn", pci_air);
- printk("PCI CIR -> 0x%xn", pci_cir);
- ST40PCI_WRITE(AINT, ~0);
- }
- }
- /* Rounds a number UP to the nearest power of two. Used for
- * sizing the PCI window.
- */
- static u32 __init r2p2(u32 num)
- {
- int i = 31;
- u32 tmp = num;
- if (num == 0)
- return 0;
- do {
- if (tmp & (1 << 31))
- break;
- i--;
- tmp <<= 1;
- } while (i >= 0);
- tmp = 1 << i;
- /* If the original number isn't a power of 2, round it up */
- if (tmp != num)
- tmp <<= 1;
- return tmp;
- }
- static void __init pci_fixup_ide_bases(struct pci_dev *d)
- {
- int i;
- /*
- * PCI IDE controllers use non-standard I/O port decoding, respect it.
- */
- if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
- return;
- printk("PCI: IDE base address fixup for %sn", d->slot_name);
- for(i=0; i<4; i++) {
- struct resource *r = &d->resource[i];
- if ((r->start & ~0x80) == 0x374) {
- r->start |= 2;
- r->end = r->start;
- }
- }
- }
- /* Add future fixups here... */
- struct pci_fixup pcibios_fixups[] = {
- { PCI_FIXUP_HEADER, PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases },
- { 0 }
- };
- int __init st40pci_init(unsigned memStart, unsigned memSize)
- {
- u32 lsr0;
- SetPCIPLL();
- /* Initialises the ST40 pci subsystem, performing a reset, then programming
- * up the address space decoders appropriately
- */
- /* Should reset core here as well methink */
- ST40PCI_WRITE(CR, CR_LOCK_MASK | CR_SOFT_RESET);
- /* Loop while core resets */
- while (ST40PCI_READ(CR) & CR_SOFT_RESET);
- /* Now, lets reset all the cards on the bus with extreme prejudice */
- ST40PCI_WRITE(CR, CR_LOCK_MASK | CR_RSTCTL);
- udelay(250);
- /* Set bus active, take it out of reset */
- ST40PCI_WRITE(CR, CR_LOCK_MASK | CR_CFINT | CR_PFCS | CR_PFE);
- /* The PCI spec says that no access must be made to the bus until 1 second
- * after reset. This seem ludicrously long, but some delay is needed here
- */
- mdelay(1000);
- /* Switch off interrupts */
- ST40PCI_WRITE(INTM, 0);
- ST40PCI_WRITE(AINT, 0);
- /* Allow it to be a master */
- ST40PCI_WRITE_SHORT(CSR_CMD,
- PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
- PCI_COMMAND_IO);
- /* Accesse to the 0xb0000000 -> 0xb6000000 area will go through to 0x10000000 -> 0x16000000
- * on the PCI bus. This allows a nice 1-1 bus to phys mapping.
- */
- ST40PCI_WRITE(MBR, 0x10000000);
- /* Always set the max size 128M (actually, it is only 96MB wide) */
- ST40PCI_WRITE(MBMR, 0x07ff0000);
- /* I/O addresses are mapped at 0xb6000000 -> 0xb7000000. These are changed to 0, to
- * allow cards that have legacy io such as vga to function correctly. This gives a
- * maximum of 64K of io/space as only the bottom 16 bits of the address are copied
- * over to the bus when the transaction is made. 64K of io space is more than enough
- */
- ST40PCI_WRITE(IOBR, 0x0);
- /* Set up the 64K window */
- ST40PCI_WRITE(IOBMR, 0x0);
- /* Now we set up the mbars so the PCI bus can see the memory of the machine */
- if (memSize < (64 * 1024)) {
- printk("Ridiculous memory size of 0x%x?n",memSize);
- return 0;
- }
- lsr0 =
- (memSize >
- (512 * 1024 * 1024)) ? 0x1fff0001 : ((r2p2(memSize) -
- 0x10000) | 0x1);
- ST40PCI_WRITE(LSR0, lsr0);
- ST40PCI_WRITE(CSR_MBAR0, memStart);
- ST40PCI_WRITE(LAR0, memStart);
- /* Maximise timeout values */
- ST40PCI_WRITE_BYTE(CSR_TRDY, 0xff);
- ST40PCI_WRITE_BYTE(CSR_RETRY, 0xff);
- ST40PCI_WRITE_BYTE(CSR_MIT, 0xff);
- /* Install the pci interrupt handlers */
- make_intc2_irq(ST40PCI_SERR_IRQ, INTC2_BASE0,
- ST40PCI_SERR_INT_GROUP, ST40PCI_SERR_INT_POS,
- ST40PCI_SERR_INT_PRI);
- make_intc2_irq(ST40PCI_ERR_IRQ, INTC2_BASE0, ST40PCI_ERR_INT_GROUP,
- ST40PCI_ERR_INT_POS, ST40PCI_ERR_INT_PRI);
- return 1;
- }
- char * __init pcibios_setup(char *str)
- {
- return str;
- }
- #define SET_CONFIG_BITS(bus,devfn,where)
- (((bus) << 16) | ((devfn) << 8) | ((where) & ~3) | (bus!=0))
- #define CONFIG_CMD(dev, where) SET_CONFIG_BITS((dev)->bus->number,(dev)->devfn,where)
- static int CheckForMasterAbort(void)
- {
- if (ST40PCI_READ(INT) & INT_MADIM) {
- /* Should we clear config space version as well ??? */
- ST40PCI_WRITE(INT, INT_MADIM);
- ST40PCI_WRITE_SHORT(CSR_STATUS, 0);
- return 1;
- }
- return 0;
- }
- /* Write to config register */
- static int st40pci_read_config_byte(struct pci_dev *dev, int where,
- u8 * val)
- {
- ST40PCI_WRITE(PAR, CONFIG_CMD(dev, where));
- *val = ST40PCI_READ_BYTE(PDR + (where & 3));
- if (CheckForMasterAbort())
- *val = 0xff;
- return PCIBIOS_SUCCESSFUL;
- }
- static int st40pci_read_config_word(struct pci_dev *dev, int where,
- u16 * val)
- {
- ST40PCI_WRITE(PAR, CONFIG_CMD(dev, where));
- *val = ST40PCI_READ_SHORT(PDR + (where & 2));
- if (CheckForMasterAbort())
- *val = 0xffff;
- return PCIBIOS_SUCCESSFUL;
- }
- static int st40pci_read_config_dword(struct pci_dev *dev, int where,
- u32 * val)
- {
- ST40PCI_WRITE(PAR, CONFIG_CMD(dev, where));
- *val = ST40PCI_READ(PDR);
- if (CheckForMasterAbort())
- *val = 0xffffffff;
- return PCIBIOS_SUCCESSFUL;
- }
- static int st40pci_write_config_byte(struct pci_dev *dev, int where,
- u8 val)
- {
- ST40PCI_WRITE(PAR, CONFIG_CMD(dev, where));
- ST40PCI_WRITE_BYTE(PDR + (where & 3), val);
- CheckForMasterAbort();
- return PCIBIOS_SUCCESSFUL;
- }
- static int st40pci_write_config_word(struct pci_dev *dev, int where,
- u16 val)
- {
- ST40PCI_WRITE(PAR, CONFIG_CMD(dev, where));
- ST40PCI_WRITE_SHORT(PDR + (where & 2), val);
- CheckForMasterAbort();
- return PCIBIOS_SUCCESSFUL;
- }
- static int st40pci_write_config_dword(struct pci_dev *dev, int where,
- u32 val)
- {
- ST40PCI_WRITE(PAR, CONFIG_CMD(dev, where));
- ST40PCI_WRITE(PDR, val);
- CheckForMasterAbort();
- return PCIBIOS_SUCCESSFUL;
- }
- static struct pci_ops pci_config_ops = {
- st40pci_read_config_byte,
- st40pci_read_config_word,
- st40pci_read_config_dword,
- st40pci_write_config_byte,
- st40pci_write_config_word,
- st40pci_write_config_dword
- };
- /* Everything hangs off this */
- static struct pci_bus *pci_root_bus;
- static u8 __init no_swizzle(struct pci_dev *dev, u8 * pin)
- {
- return PCI_SLOT(dev->devfn);
- }
- /* This needs to be shunted out of here into the board specific bit */
- #define HARP_PCI_IRQ 1
- #define HARP_BRIDGE_IRQ 2
- #define OVERDRIVE_SLOT0_IRQ 0
- static int __init map_harp_irq(struct pci_dev *dev, u8 slot, u8 pin)
- {
- switch (slot) {
- #ifdef CONFIG_SH_STB1_HARP
- case 2: /*This is the PCI slot on the */
- return HARP_PCI_IRQ;
- case 1: /* this is the bridge */
- return HARP_BRIDGE_IRQ;
- #elif defined(CONFIG_SH_STB1_OVERDRIVE)
- case 1:
- case 2:
- case 3:
- return slot - 1;
- #else
- #error Unknown board
- #endif
- default:
- return -1;
- }
- }
- void __init
- pcibios_fixup_pbus_ranges(struct pci_bus *bus,
- struct pbus_set_ranges_data *ranges)
- {
- ranges->io_start -= bus->resource[0]->start;
- ranges->io_end -= bus->resource[0]->start;
- ranges->mem_start -= bus->resource[1]->start;
- ranges->mem_end -= bus->resource[1]->start;
- }
- void __init pcibios_init(void)
- {
- extern unsigned long memory_start, memory_end;
- if (sh_mv.mv_init_pci != NULL) {
- sh_mv.mv_init_pci();
- }
- /* The pci subsytem needs to know where memory is and how much
- * of it there is. I've simply made these globals. A better mechanism
- * is probably needed.
- */
- st40pci_init(PHYSADDR(memory_start),
- PHYSADDR(memory_end) - PHYSADDR(memory_start));
- if (request_irq(ST40PCI_ERR_IRQ, st40_pci_irq,
- SA_INTERRUPT, "st40pci", NULL)) {
- printk(KERN_ERR "st40pci: Cannot hook interruptn");
- return;
- }
- /* Enable the PCI interrupts on the device */
- ST40PCI_WRITE(INTM, ~0);
- ST40PCI_WRITE(AINT, ~0);
- /* Map the io address apprioately */
- #ifdef CONFIG_HD64465
- hd64465_port_map(PCIBIOS_MIN_IO, (64 * 1024) - PCIBIOS_MIN_IO + 1,
- ST40_IO_ADDR + PCIBIOS_MIN_IO, 0);
- #endif
- /* ok, do the scan man */
- pci_root_bus = pci_scan_bus(0, &pci_config_ops, NULL);
- pci_assign_unassigned_resources();
- pci_fixup_irqs(no_swizzle, map_harp_irq);
- }
- void __init pcibios_fixup_bus(struct pci_bus *bus)
- {
- }