/*
* CHRP pci routines.
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/ide.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/hydra.h>
#include <asm/prom.h>
#include <asm/gg2.h>
#include <asm/machdep.h>
#include <asm/sections.h>
#include <asm/pci-bridge.h>
#include <asm/open_pic.h>
#include <asm/grackle.h>
#include <asm/rtas.h>
/* LongTrail */
void __iomem *gg2_pci_config_base;
/*
* The VLSI Golden Gate II has only 512K of PCI configuration space, so we
* limit the bus number to 3 bits
*/
int gg2_read_config(struct pci_bus *bus, unsigned int devfn, int off,
int len, u32 *val)
{
volatile void __iomem *cfg_data;
struct pci_controller *hose = bus->sysdata;
if (bus->number > 7)
return PCIBIOS_DEVICE_NOT_FOUND;
/*
* Note: the caller has already checked that off is
* suitably aligned and that len is 1, 2 or 4.
*/
cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
switch (len) {
case 1:
*val = in_8(cfg_data);
break;
case 2:
*val = in_le16(cfg_data);
break;
default:
*val = in_le32(cfg_data);
break;
}
return PCIBIOS_SUCCESSFUL;
}
int gg2_write_config(struct pci_bus *bus, unsigned int devfn, int off,
int len, u32 val)
{
volatile void __iomem *cfg_data;
struct pci_controller *hose = bus->sysdata;
if (bus->number > 7)
return PCIBIOS_DEVICE_NOT_FOUND;
/*
* Note: the caller has already checked that off is
* suitably aligned and that len is 1, 2 or 4.
*/
cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
switch (len) {
case 1:
out_8(cfg_data, val);
break;
case 2:
out_le16(cfg_data, val);
break;
default:
out_le32(cfg_data, val);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops gg2_pci_ops =
{
gg2_read_config,
gg2_write_config
};
/*
* Access functions for PCI config space using RTAS calls.
*/
int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
int len, u32 *val)
{
struct pci_controller *hose = bus->sysdata;
unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
| (((bus->number - hose->first_busno) & 0xff) << 16)
| (hose->index << 24);
int ret = -1;
int rval;
rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
*val = ret;
return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
}
int rtas_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
int len, u32 val)
{
struct pci_controller *hose = bus->sysdata;
unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
| (((bus->number - hose->first_busno) & 0xff) << 16)
| (hose->index << 24);
int rval;
rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
addr, len, val);
return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
}
static struct pci_ops rtas_pci_ops =
{
rtas_read_config,
rtas_write_config
};
volatile struct Hydra __iomem *Hydra = NULL;
int __init
hydra_init(void)
{
struct device_node *np;
np = find_devices("mac-io");
if (np == NULL || np->n_addrs == 0)
return 0;
Hydra = ioremap(np->addrs[0].address, np->addrs[0].size);
printk("Hydra Mac I/O at %lx\n", np->addrs[0].address);
printk("Hydra Feature_Control was %x",
in_le32(&Hydra->Feature_Control));
out_le32(&Hydra->Feature_Control, (HYDRA_FC_SCC_CELL_EN |
HYDRA_FC_SCSI_CELL_EN |
HYDRA_FC_SCCA_ENABLE |
HYDRA_FC_SCCB_ENABLE |
HYDRA_FC_ARB_BYPASS |
HYDRA_FC_MPIC_ENABLE |
HYDRA_FC_SLOW_SCC_PCLK |
HYDRA_FC_MPIC_IS_MASTER));
printk(", now %x\n", in_le32(&Hydra->Feature_Control));
return 1;
}
void __init
chrp_pcibios_fixup(void)
{
struct pci_dev *dev = NULL;
struct device_node *np;
/* PCI interrupts are controlled by the OpenPIC */
for_each_pci_dev(dev) {
np = pci_device_to_OF_node(dev);
if ((np != 0) && (np->n_intrs > 0) && (np->intrs[0].line != 0))
dev->irq = np->intrs[0].line;
pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
}
}
#define PRG_CL_RESET_VALID 0x00010000
static void __init
setup_python(struct pci_controller *hose, struct device_node *dev)
{
u32 __iomem *reg;
u32 val;
unsigned long addr = dev->addrs[0].address;
setup_indirect_pci(hose, addr + 0xf8000, addr + 0xf8010);
/* Clear the magic go-slow bit */
reg = ioremap(dev->addrs[0].address + 0xf6000, 0x40);
val = in_be32(®[12]);
if (val & PRG_CL_RESET_VALID) {
out_be32(®[12], val & ~PRG_CL_RESET_VALID);
in_be32(®[12]);
}
iounmap(reg);
}
/* Marvell Discovery II based Pegasos 2 */
static void __init setup_peg2(struct pci_controller *hose, struct device_node *dev)
{
struct device_node *root = find_path_device("/");
struct device_node *rtas;
rtas = of_find_node_by_name (root, "rtas");
if (rtas) {
hose->ops = &rtas_pci_ops;
} else {
printk ("RTAS supporting Pegasos OF not found, please upgrade"
" your firmware\n");
}
pci_assign_all_buses = 1;
}
void __init
chrp_find_bridges(void)
{
struct device_node *dev;
int *bus_range;
int len, index = -1;
struct pci_controller *hose;
unsigned int *dma;
char *model, *machine;
int is_longtrail = 0, is_mot = 0, is_pegasos = 0;
struct device_node *root = find_path_device("/");
/*
* The PCI host bridge nodes on some machines don't have
* properties to adequately identify them, so we have to
* look at what sort of machine this is as well.
*/
machine = get_property(root, "model", NULL);
if (machine != NULL) {
is_longtrail = strncmp(machine, "IBM,LongTrail", 13) == 0;
is_mot = strncmp(machine, "MOT", 3) == 0;
if (strncmp(machine, "Pegasos2", 8) == 0)
is_pegasos = 2;
else if (strncmp(machine, "Pegasos", 7) == 0)
is_pegasos = 1;
}
for (dev = root->child; dev != NULL; dev = dev->sibling) {
if (dev->type == NULL || strcmp(dev->type, "pci") != 0)
continue;
++index;
/* The GG2 bridge on the LongTrail doesn't have an address */
if (dev->n_addrs < 1 && !is_longtrail) {
printk(KERN_WARNING "Can't use %s: no address\n",
dev->full_name);
continue;
}
bus_range = (int *) get_property(dev, "bus-range", &len);
if (bus_range == NULL || len < 2 * sizeof(int)) {
printk(KERN_WARNING "Can't get bus-range for %s\n",
dev->full_name);
continue;
}
if (bus_range[1] == bus_range[0])
printk(KERN_INFO "PCI bus %d", bus_range[0]);
else
printk(KERN_INFO "PCI buses %d..%d",
bus_range[0], bus_range[1]);
printk(" controlled by %s", dev->type);
if (dev->n_addrs > 0)
printk(" at %lx", dev->addrs[0].address);
printk("\n");
hose = pcibios_alloc_controller();
if (!hose) {
printk("Can't allocate PCI controller structure for %s\n",
dev->full_name);
continue;
}
hose->arch_data = dev;
hose->first_busno = bus_range[0];
hose->last_busno = bus_range[1];
model = get_property(dev, "model", NULL);
if (model == NULL)
model = "<none>";
if (device_is_compatible(dev, "IBM,python")) {
setup_python(hose, dev);
} else if (is_mot
|| strncmp(model, "Motorola, Grackle", 17) == 0) {
setup_grackle(hose);
} else if (is_longtrail) {
void __iomem *p = ioremap(GG2_PCI_CONFIG_BASE, 0x80000);
hose->ops = &gg2_pci_ops;
hose->cfg_data = p;
gg2_pci_config_base = p;
} else if (is_pegasos == 1) {
setup_indirect_pci(hose, 0xfec00cf8, 0xfee00cfc);
} else if (is_pegasos == 2) {
setup_peg2(hose, dev);
} else {
printk("No methods for %s (model %s), using RTAS\n",
dev->full_name, model);
hose->ops = &rtas_pci_ops;
}
pci_process_bridge_OF_ranges(hose, dev, index == 0);
/* check the first bridge for a property that we can
use to set pci_dram_offset */
dma = (unsigned int *)
get_property(dev, "ibm,dma-ranges", &len);
if (index == 0 && dma != NULL && len >= 6 * sizeof(*dma)) {
pci_dram_offset = dma[2] - dma[3];
printk("pci_dram_offset = %lx\n", pci_dram_offset);
}
}
/* Do not fixup interrupts from OF tree on pegasos */
if (is_pegasos == 0)
ppc_md.pcibios_fixup = chrp_pcibios_fixup;
}
