/*
* Copyright (C) 2000 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.
*
* This file contains the PCI routines required for the Galileo GT6411
* PCI bridge as used on the Orion and Overdrive boards.
*
*/
#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 <linux/ioport.h>
#include <asm/overdrive/overdrive.h>
#include <asm/overdrive/gt64111.h>
/* After boot, we shift the Galileo registers so that they appear
* in BANK6, along with IO space. This means we can have one contingous
* lump of PCI address space without these registers appearing in the
* middle of them
*/
#define GT64111_BASE_ADDRESS 0xbb000000
#define GT64111_IO_BASE_ADDRESS 0x1000
/* The GT64111 registers appear at this address to the SH4 after reset */
#define RESET_GT64111_BASE_ADDRESS 0xb4000000
/* Macros used to access the Galileo registers */
#define RESET_GT64111_REG(x) (RESET_GT64111_BASE_ADDRESS+x)
#define GT64111_REG(x) (GT64111_BASE_ADDRESS+x)
#define RESET_GT_WRITE(x,v) writel((v),RESET_GT64111_REG(x))
#define RESET_GT_READ(x) readl(RESET_GT64111_REG(x))
#define GT_WRITE(x,v) writel((v),GT64111_REG(x))
#define GT_WRITE_BYTE(x,v) writeb((v),GT64111_REG(x))
#define GT_WRITE_SHORT(x,v) writew((v),GT64111_REG(x))
#define GT_READ(x) readl(GT64111_REG(x))
#define GT_READ_BYTE(x) readb(GT64111_REG(x))
#define GT_READ_SHORT(x) readw(GT64111_REG(x))
/* Where the various SH banks start at */
#define SH_BANK4_ADR 0xb0000000
#define SH_BANK5_ADR 0xb4000000
#define SH_BANK6_ADR 0xb8000000
/* Masks out everything but lines 28,27,26 */
#define BANK_SELECT_MASK 0x1c000000
#define SH4_TO_BANK(x) ( (x) & BANK_SELECT_MASK)
/*
* Masks used for address conversaion. Bank 6 is used for IO and
* has all the address bits zeroed by the FPGA. Special case this
*/
#define MEMORY_BANK_MASK 0x1fffffff
#define IO_BANK_MASK 0x03ffffff
/* Mark bank 6 as the bank used for IO. You can change this in the FPGA code
* if you want
*/
#define IO_BANK_ADR PCI_GTIO_BASE
/* Will select the correct mask to apply depending on the SH$ address */
#define SELECT_BANK_MASK(x) \
( (SH4_TO_BANK(x)==SH4_TO_BANK(IO_BANK_ADR)) ? IO_BANK_MASK : MEMORY_BANK_MASK)
/* Converts between PCI space and P2 region */
#define SH4_TO_PCI(x) ((x)&SELECT_BANK_MASK(x))
/* Various macros for figuring out what to stick in the Galileo registers.
* You *really* don't want to figure this stuff out by hand, you always get
* it wrong
*/
#define GT_MEM_LO_ADR(x) ((((unsigned)((x)&SELECT_BANK_MASK(x)))>>21)&0x7ff)
#define GT_MEM_HI_ADR(x) ((((unsigned)((x)&SELECT_BANK_MASK(x)))>>21)&0x7f)
#define GT_MEM_SUB_ADR(x) ((((unsigned)((x)&SELECT_BANK_MASK(x)))>>20)&0xff)
#define PROGRAM_HI_LO(block,a,s) \
GT_WRITE(block##_LO_DEC_ADR,GT_MEM_LO_ADR(a));\
GT_WRITE(block##_HI_DEC_ADR,GT_MEM_HI_ADR(a+s-1))
#define PROGRAM_SUB_HI_LO(block,a,s) \
GT_WRITE(block##_LO_DEC_ADR,GT_MEM_SUB_ADR(a));\
GT_WRITE(block##_HI_DEC_ADR,GT_MEM_SUB_ADR(a+s-1))
/* We need to set the size, and the offset register */
#define GT_BAR_MASK(x) ((x)&~0xfff)
/* Macro to set up the BAR in the Galileo. Essentially used for the DRAM */
#define PROGRAM_GT_BAR(block,a,s) \
GT_WRITE(PCI_##block##_BANK_SIZE,GT_BAR_MASK((s-1)));\
write_config_to_galileo(PCI_CONFIG_##block##_BASE_ADR,\
GT_BAR_MASK(a))
#define DISABLE_GT_BAR(block) \
GT_WRITE(PCI_##block##_BANK_SIZE,0),\
GT_CONFIG_WRITE(PCI_CONFIG_##block##_BASE_ADR,\
0x80000000)
/* Macros to disable things we are not going to use */
#define DISABLE_DECODE(x) GT_WRITE(x##_LO_DEC_ADR,0x7ff);\
GT_WRITE(x##_HI_DEC_ADR,0x00)
#define DISABLE_SUB_DECODE(x) GT_WRITE(x##_LO_DEC_ADR,0xff);\
GT_WRITE(x##_HI_DEC_ADR,0x00)
static void __init reset_pci(void)
{
/* Set RESET_PCI bit high */
writeb(readb(OVERDRIVE_CTRL) | ENABLE_PCI_BIT, OVERDRIVE_CTRL);
udelay(250);
/* Set RESET_PCI bit low */
writeb(readb(OVERDRIVE_CTRL) & RESET_PCI_MASK, OVERDRIVE_CTRL);
udelay(250);
writeb(readb(OVERDRIVE_CTRL) | ENABLE_PCI_BIT, OVERDRIVE_CTRL);
udelay(250);
}
static int write_config_to_galileo(int where, u32 val);
#define GT_CONFIG_WRITE(where,val) write_config_to_galileo(where,val)
#define ENABLE_PCI_DRAM
#ifdef TEST_DRAM
/* Test function to check out if the PCI DRAM is working OK */
static int /* __init */ test_dram(unsigned *base, unsigned size)
{
unsigned *p = base;
unsigned *end = (unsigned *) (((unsigned) base) + size);
unsigned w;
for (p = base; p < end; p++) {
*p = 0xffffffff;
if (*p != 0xffffffff) {
printk("AAARGH -write failed!!! at %p is %x\n", p,
*p);
return 0;
}
*p = 0x0;
if (*p != 0x0) {
printk("AAARGH -write failed!!!\n");
return 0;
}
}
for (p = base; p < end; p++) {
*p = (unsigned) p;
if (*p != (unsigned) p) {
printk("Failed at 0x%p, actually is 0x%x\n", p,
*p);
return 0;
}
}
for (p = base; p < end; p++) {
w = ((unsigned) p & 0xffff0000);
*p = w | (w >> 16);
}
for (p = base; p < end; p++) {
w = ((unsigned) p & 0xffff0000);
w |= (w >> 16);
if (*p != w) {
printk
("Failed at 0x%p, should be 0x%x actually is 0x%x\n",
p, w, *p);
return 0;
}
}
return 1;
}
#endif
/* Function to set up and initialise the galileo. This sets up the BARS,
* maps the DRAM into the address space etc,etc
*/
int __init galileo_init(void)
{
reset_pci();
/* Now shift the galileo regs into this block */
RESET_GT_WRITE(INTERNAL_SPACE_DEC,
GT_MEM_LO_ADR(GT64111_BASE_ADDRESS));
/* Should have a sanity check here, that you can read back at the new
* address what you just wrote
*/
/* Disable decode for all regions */
DISABLE_DECODE(RAS10);
DISABLE_DECODE(RAS32);
DISABLE_DECODE(CS20);
DISABLE_DECODE(CS3);
DISABLE_DECODE(PCI_IO);
DISABLE_DECODE(PCI_MEM0);
DISABLE_DECODE(PCI_MEM1);
/* Disable all BARS */
GT_WRITE(BAR_ENABLE_ADR, 0x1ff);
DISABLE_GT_BAR(RAS10);
DISABLE_GT_BAR(RAS32);
DISABLE_GT_BAR(CS20);
DISABLE_GT_BAR(CS3);
/* Tell the BAR where the IO registers now are */
GT_CONFIG_WRITE(PCI_CONFIG_INT_REG_IO_ADR,GT_BAR_MASK(
(GT64111_IO_BASE_ADDRESS &
IO_BANK_MASK)));
/* set up a 112 Mb decode */
PROGRAM_HI_LO(PCI_MEM0, SH_BANK4_ADR, 112 * 1024 * 1024);
/* Set up a 32 MB io space decode */
PROGRAM_HI_LO(PCI_IO, IO_BANK_ADR, 32 * 1024 * 1024);
#ifdef ENABLE_PCI_DRAM
/* Program up the DRAM configuration - there is DRAM only in bank 0 */
/* Now set up the DRAM decode */
PROGRAM_HI_LO(RAS10, PCI_DRAM_BASE, PCI_DRAM_SIZE);
/* And the sub decode */
PROGRAM_SUB_HI_LO(RAS0, PCI_DRAM_BASE, PCI_DRAM_SIZE);
DISABLE_SUB_DECODE(RAS1);
/* Set refresh rate */
GT_WRITE(DRAM_BANK0_PARMS, 0x3f);
GT_WRITE(DRAM_CFG, 0x100);
/* we have to lob off the top bits rememeber!! */
PROGRAM_GT_BAR(RAS10, SH4_TO_PCI(PCI_DRAM_BASE), PCI_DRAM_SIZE);
#endif
/* We are only interested in decoding RAS10 and the Galileo's internal
* registers (as IO) on the PCI bus
*/
#ifdef ENABLE_PCI_DRAM
GT_WRITE(BAR_ENABLE_ADR, (~((1 << 8) | (1 << 3))) & 0x1ff);
#else
GT_WRITE(BAR_ENABLE_ADR, (~(1 << 3)) & 0x1ff);
#endif
/* Change the class code to host bridge, it actually powers up
* as a memory controller
*/
GT_CONFIG_WRITE(8, 0x06000011);
/* Allow the galileo to master the PCI bus */
GT_CONFIG_WRITE(PCI_COMMAND,
PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
PCI_COMMAND_IO);
#if 0
printk("Testing PCI DRAM - ");
if(test_dram(PCI_DRAM_BASE,PCI_DRAM_SIZE)) {
printk("Passed\n");
}else {
printk("FAILED\n");
}
#endif
return 0;
}
#define SET_CONFIG_BITS(bus,devfn,where)\
((1<<31) | ((bus) << 16) | ((devfn) << 8) | ((where) & ~3))
#define CONFIG_CMD(dev, where) SET_CONFIG_BITS((dev)->bus->number,(dev)->devfn,where)
/* This write to the galileo config registers, unlike the functions below, can
* be used before the PCI subsystem has started up
*/
static int __init write_config_to_galileo(int where, u32 val)
{
GT_WRITE(PCI_CFG_ADR, SET_CONFIG_BITS(0, 0, where));
GT_WRITE(PCI_CFG_DATA, val);
return 0;
}
/* We exclude the galileo and slot 31, the galileo because I don't know how to stop
* the setup code shagging up the setup I have done on it, and 31 because the whole
* thing locks up if you try to access that slot (which doesn't exist of course anyway
*/
#define EXCLUDED_DEV(dev) ((dev->bus->number==0) && ((PCI_SLOT(dev->devfn)==0) || (PCI_SLOT(dev->devfn) == 31)))
static int galileo_read_config_byte(struct pci_dev *dev, int where,
u8 * val)
{
/* I suspect this doesn't work because this drives a special cycle ? */
if (EXCLUDED_DEV(dev)) {
*val = 0xff;
return PCIBIOS_SUCCESSFUL;
}
/* Start the config cycle */
GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
/* Read back the result */
*val = GT_READ_BYTE(PCI_CFG_DATA + (where & 3));
return PCIBIOS_SUCCESSFUL;
}
static int galileo_read_config_word(struct pci_dev *dev, int where,
u16 * val)
{
if (EXCLUDED_DEV(dev)) {
*val = 0xffff;
return PCIBIOS_SUCCESSFUL;
}
GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
*val = GT_READ_SHORT(PCI_CFG_DATA + (where & 2));
return PCIBIOS_SUCCESSFUL;
}
static int galileo_read_config_dword(struct pci_dev *dev, int where,
u32 * val)
{
if (EXCLUDED_DEV(dev)) {
*val = 0xffffffff;
return PCIBIOS_SUCCESSFUL;
}
GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
*val = GT_READ(PCI_CFG_DATA);
return PCIBIOS_SUCCESSFUL;
}
static int galileo_write_config_byte(struct pci_dev *dev, int where,
u8 val)
{
GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
GT_WRITE_BYTE(PCI_CFG_DATA + (where & 3), val);
return PCIBIOS_SUCCESSFUL;
}
static int galileo_write_config_word(struct pci_dev *dev, int where,
u16 val)
{
GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
GT_WRITE_SHORT(PCI_CFG_DATA + (where & 2), val);
return PCIBIOS_SUCCESSFUL;
}
static int galileo_write_config_dword(struct pci_dev *dev, int where,
u32 val)
{
GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
GT_WRITE(PCI_CFG_DATA, val);
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops pci_config_ops = {
galileo_read_config_byte,
galileo_read_config_word,
galileo_read_config_dword,
galileo_write_config_byte,
galileo_write_config_word,
galileo_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);
}
static int __init map_od_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
/* Slot 1: Galileo
* Slot 2: PCI Slot 1
* Slot 3: PCI Slot 2
* Slot 4: ESS
*/
switch (slot) {
case 2:
return OVERDRIVE_PCI_IRQ1;
case 3:
/* Note this assumes you have a hacked card in slot 2 */
return OVERDRIVE_PCI_IRQ2;
case 4:
return OVERDRIVE_ESS_IRQ;
default:
/* printk("PCI: Unexpected IRQ mapping request for slot %d\n", slot); */
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;
}
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 %s\n", pci_name(d));
for(i=0; i<4; i++) {
struct resource *r = &d->resource[i];
if ((r->start & ~0x80) == 0x374) {
r->start |= 2;
r->end = r->start;
}
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
void __init pcibios_init(void)
{
static struct resource galio,galmem;
/* Allocate the registers used by the Galileo */
galio.flags = IORESOURCE_IO;
galio.name = "Galileo GT64011";
galmem.flags = IORESOURCE_MEM|IORESOURCE_PREFETCH;
galmem.name = "Galileo GT64011 DRAM";
allocate_resource(&ioport_resource, &galio, 256,
GT64111_IO_BASE_ADDRESS,GT64111_IO_BASE_ADDRESS+256, 256, NULL, NULL);
allocate_resource(&iomem_resource, &galmem,PCI_DRAM_SIZE,
PHYSADDR(PCI_DRAM_BASE), PHYSADDR(PCI_DRAM_BASE)+PCI_DRAM_SIZE,
PCI_DRAM_SIZE, NULL, NULL);
/* 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_od_irq);
#ifdef TEST_DRAM
printk("Testing PCI DRAM - ");
if(test_dram(PCI_DRAM_BASE,PCI_DRAM_SIZE)) {
printk("Passed\n");
}else {
printk("FAILED\n");
}
#endif
}
char * __init pcibios_setup(char *str)
{
return str;
}
int pcibios_enable_device(struct pci_dev *dev)
{
u16 cmd, old_cmd;
int idx;
struct resource *r;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
old_cmd = cmd;
for (idx = 0; idx < 6; idx++) {
r = dev->resource + idx;
if (!r->start && r->end) {
printk(KERN_ERR
"PCI: Device %s not available because"
" of resource collisions\n",
pci_name(dev));
return -EINVAL;
}
if (r->flags & IORESOURCE_IO)
cmd |= PCI_COMMAND_IO;
if (r->flags & IORESOURCE_MEM)
cmd |= PCI_COMMAND_MEMORY;
}
if (cmd != old_cmd) {
printk("PCI: enabling device %s (%04x -> %04x)\n",
pci_name(dev), old_cmd, cmd);
pci_write_config_word(dev, PCI_COMMAND, cmd);
}
return 0;
}
/* We should do some optimisation work here I think. Ok for now though */
void __init pcibios_fixup_bus(struct pci_bus *bus)
{
}
void pcibios_align_resource(void *data, struct resource *res,
resource_size_t size)
{
}
void __init pcibios_update_resource(struct pci_dev *dev, struct resource *root,
struct resource *res, int resource)
{
unsigned long where, size;
u32 reg;
printk("PCI: Assigning %3s %08lx to %s\n",
res->flags & IORESOURCE_IO ? "IO" : "MEM",
res->start, dev->name);
where = PCI_BASE_ADDRESS_0 + resource * 4;
size = res->end - res->start;
pci_read_config_dword(dev, where, ®);
reg = (reg & size) | (((u32) (res->start - root->start)) & ~size);
pci_write_config_dword(dev, where, reg);
}
void __init pcibios_update_irq(struct pci_dev *dev, int irq)
{
printk("PCI: Assigning IRQ %02d to %s\n", irq, dev->name);
pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
}
/*
* If we set up a device for bus mastering, we need to check the latency
* timer as certain crappy BIOSes forget to set it properly.
*/
unsigned int pcibios_max_latency = 255;
void pcibios_set_master(struct pci_dev *dev)
{
u8 lat;
pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
if (lat < 16)
lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
else if (lat > pcibios_max_latency)
lat = pcibios_max_latency;
else
return;
printk("PCI: Setting latency timer of device %s to %d\n", pci_name(dev), lat);
pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
}
