/*
* arch/ppc64/kernel/rtas_pci.c
*
* Copyright (C) 2001 Dave Engebretsen, IBM Corporation
* Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
*
* RTAS specific routines for PCI.
*
* Based on code from pci.c, chrp_pci.c and pSeries_pci.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/threads.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/pci-bridge.h>
#include <asm/iommu.h>
#include <asm/rtas.h>
#include "mpic.h"
#include "pci.h"
/* RTAS tokens */
static int read_pci_config;
static int write_pci_config;
static int ibm_read_pci_config;
static int ibm_write_pci_config;
static int config_access_valid(struct device_node *dn, int where)
{
if (where < 256)
return 1;
if (where < 4096 && dn->pci_ext_config_space)
return 1;
return 0;
}
static int rtas_read_config(struct device_node *dn, int where, int size, u32 *val)
{
int returnval = -1;
unsigned long buid, addr;
int ret;
if (!dn)
return PCIBIOS_DEVICE_NOT_FOUND;
if (!config_access_valid(dn, where))
return PCIBIOS_BAD_REGISTER_NUMBER;
addr = ((where & 0xf00) << 20) | (dn->busno << 16) |
(dn->devfn << 8) | (where & 0xff);
buid = dn->phb->buid;
if (buid) {
ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
addr, buid >> 32, buid & 0xffffffff, size);
} else {
ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
}
*val = returnval;
if (ret)
return PCIBIOS_DEVICE_NOT_FOUND;
if (returnval == EEH_IO_ERROR_VALUE(size)
&& eeh_dn_check_failure (dn, NULL))
return PCIBIOS_DEVICE_NOT_FOUND;
return PCIBIOS_SUCCESSFUL;
}
static int rtas_pci_read_config(struct pci_bus *bus,
unsigned int devfn,
int where, int size, u32 *val)
{
struct device_node *busdn, *dn;
if (bus->self)
busdn = pci_device_to_OF_node(bus->self);
else
busdn = bus->sysdata; /* must be a phb */
/* Search only direct children of the bus */
for (dn = busdn->child; dn; dn = dn->sibling)
if (dn->devfn == devfn)
return rtas_read_config(dn, where, size, val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
static int rtas_write_config(struct device_node *dn, int where, int size, u32 val)
{
unsigned long buid, addr;
int ret;
if (!dn)
return PCIBIOS_DEVICE_NOT_FOUND;
if (!config_access_valid(dn, where))
return PCIBIOS_BAD_REGISTER_NUMBER;
addr = ((where & 0xf00) << 20) | (dn->busno << 16) |
(dn->devfn << 8) | (where & 0xff);
buid = dn->phb->buid;
if (buid) {
ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr, buid >> 32, buid & 0xffffffff, size, (ulong) val);
} else {
ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
}
if (ret)
return PCIBIOS_DEVICE_NOT_FOUND;
return PCIBIOS_SUCCESSFUL;
}
static int rtas_pci_write_config(struct pci_bus *bus,
unsigned int devfn,
int where, int size, u32 val)
{
struct device_node *busdn, *dn;
if (bus->self)
busdn = pci_device_to_OF_node(bus->self);
else
busdn = bus->sysdata; /* must be a phb */
/* Search only direct children of the bus */
for (dn = busdn->child; dn; dn = dn->sibling)
if (dn->devfn == devfn)
return rtas_write_config(dn, where, size, val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
struct pci_ops rtas_pci_ops = {
rtas_pci_read_config,
rtas_pci_write_config
};
int is_python(struct device_node *dev)
{
char *model = (char *)get_property(dev, "model", NULL);
if (model && strstr(model, "Python"))
return 1;
return 0;
}
static int get_phb_reg_prop(struct device_node *dev,
unsigned int addr_size_words,
struct reg_property64 *reg)
{
unsigned int *ui_ptr = NULL, len;
/* Found a PHB, now figure out where his registers are mapped. */
ui_ptr = (unsigned int *)get_property(dev, "reg", &len);
if (ui_ptr == NULL)
return 1;
if (addr_size_words == 1) {
reg->address = ((struct reg_property32 *)ui_ptr)->address;
reg->size = ((struct reg_property32 *)ui_ptr)->size;
} else {
*reg = *((struct reg_property64 *)ui_ptr);
}
return 0;
}
static void python_countermeasures(struct device_node *dev,
unsigned int addr_size_words)
{
struct reg_property64 reg_struct;
void __iomem *chip_regs;
volatile u32 val;
if (get_phb_reg_prop(dev, addr_size_words, ®_struct))
return;
/* Python's register file is 1 MB in size. */
chip_regs = ioremap(reg_struct.address & ~(0xfffffUL), 0x100000);
/*
* Firmware doesn't always clear this bit which is critical
* for good performance - Anton
*/
#define PRG_CL_RESET_VALID 0x00010000
val = in_be32(chip_regs + 0xf6030);
if (val & PRG_CL_RESET_VALID) {
printk(KERN_INFO "Python workaround: ");
val &= ~PRG_CL_RESET_VALID;
out_be32(chip_regs + 0xf6030, val);
/*
* We must read it back for changes to
* take effect
*/
val = in_be32(chip_regs + 0xf6030);
printk("reg0: %x\n", val);
}
iounmap(chip_regs);
}
void __init init_pci_config_tokens (void)
{
read_pci_config = rtas_token("read-pci-config");
write_pci_config = rtas_token("write-pci-config");
ibm_read_pci_config = rtas_token("ibm,read-pci-config");
ibm_write_pci_config = rtas_token("ibm,write-pci-config");
}
unsigned long __devinit get_phb_buid (struct device_node *phb)
{
int addr_cells;
unsigned int *buid_vals;
unsigned int len;
unsigned long buid;
if (ibm_read_pci_config == -1) return 0;
/* PHB's will always be children of the root node,
* or so it is promised by the current firmware. */
if (phb->parent == NULL)
return 0;
if (phb->parent->parent)
return 0;
buid_vals = (unsigned int *) get_property(phb, "reg", &len);
if (buid_vals == NULL)
return 0;
addr_cells = prom_n_addr_cells(phb);
if (addr_cells == 1) {
buid = (unsigned long) buid_vals[0];
} else {
buid = (((unsigned long)buid_vals[0]) << 32UL) |
(((unsigned long)buid_vals[1]) & 0xffffffff);
}
return buid;
}
static int phb_set_bus_ranges(struct device_node *dev,
struct pci_controller *phb)
{
int *bus_range;
unsigned int len;
bus_range = (int *) get_property(dev, "bus-range", &len);
if (bus_range == NULL || len < 2 * sizeof(int)) {
return 1;
}
phb->first_busno = bus_range[0];
phb->last_busno = bus_range[1];
return 0;
}
static int __devinit setup_phb(struct device_node *dev,
struct pci_controller *phb,
unsigned int addr_size_words)
{
pci_setup_pci_controller(phb);
if (is_python(dev))
python_countermeasures(dev, addr_size_words);
if (phb_set_bus_ranges(dev, phb))
return 1;
phb->arch_data = dev;
phb->ops = &rtas_pci_ops;
phb->buid = get_phb_buid(dev);
return 0;
}
static void __devinit add_linux_pci_domain(struct device_node *dev,
struct pci_controller *phb,
struct property *of_prop)
{
memset(of_prop, 0, sizeof(struct property));
of_prop->name = "linux,pci-domain";
of_prop->length = sizeof(phb->global_number);
of_prop->value = (unsigned char *)&of_prop[1];
memcpy(of_prop->value, &phb->global_number, sizeof(phb->global_number));
prom_add_property(dev, of_prop);
}
static struct pci_controller * __init alloc_phb(struct device_node *dev,
unsigned int addr_size_words)
{
struct pci_controller *phb;
struct property *of_prop;
phb = alloc_bootmem(sizeof(struct pci_controller));
if (phb == NULL)
return NULL;
of_prop = alloc_bootmem(sizeof(struct property) +
sizeof(phb->global_number));
if (!of_prop)
return NULL;
if (setup_phb(dev, phb, addr_size_words))
return NULL;
add_linux_pci_domain(dev, phb, of_prop);
return phb;
}
static struct pci_controller * __devinit alloc_phb_dynamic(struct device_node *dev, unsigned int addr_size_words)
{
struct pci_controller *phb;
phb = (struct pci_controller *)kmalloc(sizeof(struct pci_controller),
GFP_KERNEL);
if (phb == NULL)
return NULL;
if (setup_phb(dev, phb, addr_size_words))
return NULL;
phb->is_dynamic = 1;
/* TODO: linux,pci-domain? */
return phb;
}
unsigned long __init find_and_init_phbs(void)
{
struct device_node *node;
struct pci_controller *phb;
unsigned int root_size_cells = 0;
unsigned int index;
unsigned int *opprop = NULL;
struct device_node *root = of_find_node_by_path("/");
if (ppc64_interrupt_controller == IC_OPEN_PIC) {
opprop = (unsigned int *)get_property(root,
"platform-open-pic", NULL);
}
root_size_cells = prom_n_size_cells(root);
index = 0;
for (node = of_get_next_child(root, NULL);
node != NULL;
node = of_get_next_child(root, node)) {
if (node->type == NULL || strcmp(node->type, "pci") != 0)
continue;
phb = alloc_phb(node, root_size_cells);
if (!phb)
continue;
pci_process_bridge_OF_ranges(phb, node);
pci_setup_phb_io(phb, index == 0);
#ifdef CONFIG_PPC_PSERIES
if (ppc64_interrupt_controller == IC_OPEN_PIC && pSeries_mpic) {
int addr = root_size_cells * (index + 2) - 1;
mpic_assign_isu(pSeries_mpic, index, opprop[addr]);
}
#endif
index++;
}
of_node_put(root);
pci_devs_phb_init();
/*
* pci_probe_only and pci_assign_all_buses can be set via properties
* in chosen.
*/
if (of_chosen) {
int *prop;
prop = (int *)get_property(of_chosen, "linux,pci-probe-only",
NULL);
if (prop)
pci_probe_only = *prop;
prop = (int *)get_property(of_chosen,
"linux,pci-assign-all-buses", NULL);
if (prop)
pci_assign_all_buses = *prop;
}
return 0;
}
struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
{
struct device_node *root = of_find_node_by_path("/");
unsigned int root_size_cells = 0;
struct pci_controller *phb;
struct pci_bus *bus;
int primary;
root_size_cells = prom_n_size_cells(root);
primary = list_empty(&hose_list);
phb = alloc_phb_dynamic(dn, root_size_cells);
if (!phb)
return NULL;
pci_process_bridge_OF_ranges(phb, dn);
pci_setup_phb_io_dynamic(phb, primary);
of_node_put(root);
pci_devs_phb_init_dynamic(phb);
phb->last_busno = 0xff;
bus = pci_scan_bus(phb->first_busno, phb->ops, phb->arch_data);
phb->bus = bus;
phb->last_busno = bus->subordinate;
return phb;
}
EXPORT_SYMBOL(init_phb_dynamic);
/* RPA-specific bits for removing PHBs */
int pcibios_remove_root_bus(struct pci_controller *phb)
{
struct pci_bus *b = phb->bus;
struct resource *res;
int rc, i;
res = b->resource[0];
if (!res->flags) {
printk(KERN_ERR "%s: no IO resource for PHB %s\n", __FUNCTION__,
b->name);
return 1;
}
rc = unmap_bus_range(b);
if (rc) {
printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
__FUNCTION__, b->name);
return 1;
}
if (release_resource(res)) {
printk(KERN_ERR "%s: failed to release IO on bus %s\n",
__FUNCTION__, b->name);
return 1;
}
for (i = 1; i < 3; ++i) {
res = b->resource[i];
if (!res->flags && i == 0) {
printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
__FUNCTION__, b->name);
return 1;
}
if (res->flags && release_resource(res)) {
printk(KERN_ERR
"%s: failed to release IO %d on bus %s\n",
__FUNCTION__, i, b->name);
return 1;
}
}
list_del(&phb->list_node);
if (phb->is_dynamic)
kfree(phb);
return 0;
}
EXPORT_SYMBOL(pcibios_remove_root_bus);
