Release 4.14 arch/powerpc/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 <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 <asm/mpic.h>
#include <asm/ppc-pci.h>
#include <asm/eeh.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 inline int config_access_valid(struct pci_dn *dn, int where)
{
if (where < 256)
return 1;
if (where < 4096 && dn->pci_ext_config_space)
return 1;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arnd Bergmann | 38 | 95.00% | 1 | 33.33% |
| Paul Mackerras | 1 | 2.50% | 1 | 33.33% |
| Linas Vepstas | 1 | 2.50% | 1 | 33.33% |
| Total | 40 | 100.00% | 3 | 100.00% |
int rtas_read_config(struct pci_dn *pdn, int where, int size, u32 *val)
{
int returnval = -1;
unsigned long buid, addr;
int ret;
if (!pdn)
return PCIBIOS_DEVICE_NOT_FOUND;
if (!config_access_valid(pdn, where))
return PCIBIOS_BAD_REGISTER_NUMBER;
#ifdef CONFIG_EEH
if (pdn->edev && pdn->edev->pe &&
(pdn->edev->pe->state & EEH_PE_CFG_BLOCKED))
return PCIBIOS_SET_FAILED;
#endif
addr = rtas_config_addr(pdn->busno, pdn->devfn, where);
buid = pdn->phb->buid;
if (buid) {
ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
addr, BUID_HI(buid), BUID_LO(buid), size);
} else {
ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
}
*val = returnval;
if (ret)
return PCIBIOS_DEVICE_NOT_FOUND;
return PCIBIOS_SUCCESSFUL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arnd Bergmann | 131 | 72.38% | 1 | 20.00% |
| Gavin Shan | 32 | 17.68% | 1 | 20.00% |
| Linas Vepstas | 9 | 4.97% | 1 | 20.00% |
| Michael Ellerman | 5 | 2.76% | 1 | 20.00% |
| Paul Mackerras | 4 | 2.21% | 1 | 20.00% |
| Total | 181 | 100.00% | 5 | 100.00% |
static int rtas_pci_read_config(struct pci_bus *bus,
unsigned int devfn,
int where, int size, u32 *val)
{
struct pci_dn *pdn;
int ret;
*val = 0xFFFFFFFF;
pdn = pci_get_pdn_by_devfn(bus, devfn);
/* Validity of pdn is checked in here */
ret = rtas_read_config(pdn, where, size, val);
if (*val == EEH_IO_ERROR_VALUE(size) &&
eeh_dev_check_failure(pdn_to_eeh_dev(pdn)))
return PCIBIOS_DEVICE_NOT_FOUND;
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arnd Bergmann | 39 | 45.88% | 1 | 14.29% |
| Gavin Shan | 38 | 44.71% | 2 | 28.57% |
| Bryant G. Ly | 4 | 4.71% | 1 | 14.29% |
| Linas Vepstas | 2 | 2.35% | 1 | 14.29% |
| Jake Moilanen | 1 | 1.18% | 1 | 14.29% |
| Paul Mackerras | 1 | 1.18% | 1 | 14.29% |
| Total | 85 | 100.00% | 7 | 100.00% |
int rtas_write_config(struct pci_dn *pdn, int where, int size, u32 val)
{
unsigned long buid, addr;
int ret;
if (!pdn)
return PCIBIOS_DEVICE_NOT_FOUND;
if (!config_access_valid(pdn, where))
return PCIBIOS_BAD_REGISTER_NUMBER;
#ifdef CONFIG_EEH
if (pdn->edev && pdn->edev->pe &&
(pdn->edev->pe->state & EEH_PE_CFG_BLOCKED))
return PCIBIOS_SET_FAILED;
#endif
addr = rtas_config_addr(pdn->busno, pdn->devfn, where);
buid = pdn->phb->buid;
if (buid) {
ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr,
BUID_HI(buid), BUID_LO(buid), 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arnd Bergmann | 127 | 71.75% | 1 | 20.00% |
| Gavin Shan | 32 | 18.08% | 1 | 20.00% |
| Linas Vepstas | 9 | 5.08% | 1 | 20.00% |
| Michael Ellerman | 5 | 2.82% | 1 | 20.00% |
| Paul Mackerras | 4 | 2.26% | 1 | 20.00% |
| Total | 177 | 100.00% | 5 | 100.00% |
static int rtas_pci_write_config(struct pci_bus *bus,
unsigned int devfn,
int where, int size, u32 val)
{
struct pci_dn *pdn;
pdn = pci_get_pdn_by_devfn(bus, devfn);
/* Validity of pdn is checked in here. */
return rtas_write_config(pdn, where, size, val);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arnd Bergmann | 37 | 72.55% | 1 | 16.67% |
| Gavin Shan | 6 | 11.76% | 1 | 16.67% |
| Bryant G. Ly | 4 | 7.84% | 1 | 16.67% |
| Linas Vepstas | 2 | 3.92% | 1 | 16.67% |
| Paul Mackerras | 1 | 1.96% | 1 | 16.67% |
| Jake Moilanen | 1 | 1.96% | 1 | 16.67% |
| Total | 51 | 100.00% | 6 | 100.00% |
static struct pci_ops rtas_pci_ops = {
.read = rtas_pci_read_config,
.write = rtas_pci_write_config,
};
static int is_python(struct device_node *dev)
{
const char *model = of_get_property(dev, "model", NULL);
if (model && strstr(model, "Python"))
return 1;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arnd Bergmann | 39 | 92.86% | 1 | 25.00% |
| Jeremy Kerr | 1 | 2.38% | 1 | 25.00% |
| Michael Ellerman | 1 | 2.38% | 1 | 25.00% |
| Stephen Rothwell | 1 | 2.38% | 1 | 25.00% |
| Total | 42 | 100.00% | 4 | 100.00% |
static void python_countermeasures(struct device_node *dev)
{
struct resource registers;
void __iomem *chip_regs;
volatile u32 val;
if (of_address_to_resource(dev, 0, ®isters)) {
printk(KERN_ERR "Can't get address for Python workarounds !\n");
return;
}
/* Python's register file is 1 MB in size. */
chip_regs = ioremap(registers.start & ~(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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arnd Bergmann | 110 | 87.30% | 1 | 33.33% |
| Benjamin Herrenschmidt | 15 | 11.90% | 1 | 33.33% |
| Linas Vepstas | 1 | 0.79% | 1 | 33.33% |
| Total | 126 | 100.00% | 3 | 100.00% |
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");
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arnd Bergmann | 36 | 100.00% | 1 | 100.00% |
| Total | 36 | 100.00% | 1 | 100.00% |
unsigned long get_phb_buid(struct device_node *phb)
{
struct resource r;
if (ibm_read_pci_config == -1)
return 0;
if (of_address_to_resource(phb, 0, &r))
return 0;
return r.start;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arnd Bergmann | 36 | 80.00% | 1 | 50.00% |
| Benjamin Herrenschmidt | 9 | 20.00% | 1 | 50.00% |
| Total | 45 | 100.00% | 2 | 100.00% |
static int phb_set_bus_ranges(struct device_node *dev,
struct pci_controller *phb)
{
const __be32 *bus_range;
unsigned int len;
bus_range = of_get_property(dev, "bus-range", &len);
if (bus_range == NULL || len < 2 * sizeof(int)) {
return 1;
}
phb->first_busno = be32_to_cpu(bus_range[0]);
phb->last_busno = be32_to_cpu(bus_range[1]);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arnd Bergmann | 75 | 89.29% | 1 | 25.00% |
| Cédric Le Goater | 7 | 8.33% | 1 | 25.00% |
| Stephen Rothwell | 1 | 1.19% | 1 | 25.00% |
| Jeremy Kerr | 1 | 1.19% | 1 | 25.00% |
| Total | 84 | 100.00% | 4 | 100.00% |
int rtas_setup_phb(struct pci_controller *phb)
{
struct device_node *dev = phb->dn;
if (is_python(dev))
python_countermeasures(dev);
if (phb_set_bus_ranges(dev, phb))
return 1;
phb->ops = &rtas_pci_ops;
phb->buid = get_phb_buid(dev);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arnd Bergmann | 52 | 83.87% | 1 | 33.33% |
| Benjamin Herrenschmidt | 9 | 14.52% | 1 | 33.33% |
| Stephen Rothwell | 1 | 1.61% | 1 | 33.33% |
| Total | 62 | 100.00% | 3 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arnd Bergmann | 789 | 77.96% | 1 | 4.55% |
| Gavin Shan | 108 | 10.67% | 3 | 13.64% |
| Benjamin Herrenschmidt | 36 | 3.56% | 4 | 18.18% |
| Linas Vepstas | 24 | 2.37% | 1 | 4.55% |
| Michael Ellerman | 12 | 1.19% | 2 | 9.09% |
| Paul Mackerras | 11 | 1.09% | 1 | 4.55% |
| Bryant G. Ly | 8 | 0.79% | 1 | 4.55% |
| Cédric Le Goater | 7 | 0.69% | 1 | 4.55% |
| Nathan T. Lynch | 7 | 0.69% | 1 | 4.55% |
| Stephen Rothwell | 5 | 0.49% | 4 | 18.18% |
| Jake Moilanen | 2 | 0.20% | 1 | 4.55% |
| Jeremy Kerr | 2 | 0.20% | 1 | 4.55% |
| Jon Mason | 1 | 0.10% | 1 | 4.55% |
| Total | 1012 | 100.00% | 22 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.