Release 4.14 arch/powerpc/platforms/pasemi/pci.c
/*
* Copyright (C) 2006 PA Semi, Inc
*
* Authors: Kip Walker, PA Semi
* Olof Johansson, PA Semi
*
* Maintained by: Olof Johansson <olof@lixom.net>
*
* Based on arch/powerpc/platforms/maple/pci.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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/pci.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/ppc-pci.h>
#include "pasemi.h"
#define PA_PXP_CFA(bus, devfn, off) (((bus) << 20) | ((devfn) << 12) | (off))
static inline int pa_pxp_offset_valid(u8 bus, u8 devfn, int offset)
{
/* Device 0 Function 0 is special: It's config space spans function 1 as
* well, so allow larger offset. It's really a two-function device but the
* second function does not probe.
*/
if (bus == 0 && devfn == 0)
return offset < 8192;
else
return offset < 4096;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Olof Johansson | 38 | 100.00% | 2 | 100.00% |
| Total | 38 | 100.00% | 2 | 100.00% |
static void volatile __iomem *pa_pxp_cfg_addr(struct pci_controller *hose,
u8 bus, u8 devfn, int offset)
{
return hose->cfg_data + PA_PXP_CFA(bus, devfn, offset);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Olof Johansson | 33 | 89.19% | 1 | 50.00% |
| Al Viro | 4 | 10.81% | 1 | 50.00% |
| Total | 37 | 100.00% | 2 | 100.00% |
static inline int is_root_port(int busno, int devfn)
{
return ((busno == 0) && (PCI_FUNC(devfn) < 4) &&
((PCI_SLOT(devfn) == 16) || (PCI_SLOT(devfn) == 17)));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Olof Johansson | 51 | 100.00% | 1 | 100.00% |
| Total | 51 | 100.00% | 1 | 100.00% |
static inline int is_5945_reg(int reg)
{
return (((reg >= 0x18) && (reg < 0x34)) ||
((reg >= 0x158) && (reg < 0x178)));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Olof Johansson | 41 | 100.00% | 1 | 100.00% |
| Total | 41 | 100.00% | 1 | 100.00% |
static int workaround_5945(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 *val)
{
struct pci_controller *hose;
void volatile __iomem *addr, *dummy;
int byte;
u32 tmp;
if (!is_root_port(bus->number, devfn) || !is_5945_reg(offset))
return 0;
hose = pci_bus_to_host(bus);
addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset & ~0x3);
byte = offset & 0x3;
/* Workaround bug 5945: write 0 to a dummy register before reading,
* and write back what we read. We must read/write the full 32-bit
* contents so we need to shift and mask by hand.
*/
dummy = pa_pxp_cfg_addr(hose, bus->number, devfn, 0x10);
out_le32(dummy, 0);
tmp = in_le32(addr);
out_le32(addr, tmp);
switch (len) {
case 1:
*val = (tmp >> (8*byte)) & 0xff;
break;
case 2:
if (byte == 0)
*val = tmp & 0xffff;
else
*val = (tmp >> 16) & 0xffff;
break;
default:
*val = tmp;
break;
}
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Olof Johansson | 198 | 100.00% | 1 | 100.00% |
| Total | 198 | 100.00% | 1 | 100.00% |
static int pa_pxp_read_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 *val)
{
struct pci_controller *hose;
void volatile __iomem *addr;
hose = pci_bus_to_host(bus);
if (!hose)
return PCIBIOS_DEVICE_NOT_FOUND;
if (!pa_pxp_offset_valid(bus->number, devfn, offset))
return PCIBIOS_BAD_REGISTER_NUMBER;
if (workaround_5945(bus, devfn, offset, len, val))
return PCIBIOS_SUCCESSFUL;
addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset);
/*
* Note: the caller has already checked that offset is
* suitably aligned and that len is 1, 2 or 4.
*/
switch (len) {
case 1:
*val = in_8(addr);
break;
case 2:
*val = in_le16(addr);
break;
default:
*val = in_le32(addr);
break;
}
return PCIBIOS_SUCCESSFUL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Olof Johansson | 141 | 97.24% | 3 | 75.00% |
| Al Viro | 4 | 2.76% | 1 | 25.00% |
| Total | 145 | 100.00% | 4 | 100.00% |
static int pa_pxp_write_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 val)
{
struct pci_controller *hose;
void volatile __iomem *addr;
hose = pci_bus_to_host(bus);
if (!hose)
return PCIBIOS_DEVICE_NOT_FOUND;
if (!pa_pxp_offset_valid(bus->number, devfn, offset))
return PCIBIOS_BAD_REGISTER_NUMBER;
addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset);
/*
* Note: the caller has already checked that offset is
* suitably aligned and that len is 1, 2 or 4.
*/
switch (len) {
case 1:
out_8(addr, val);
break;
case 2:
out_le16(addr, val);
break;
default:
out_le32(addr, val);
break;
}
return PCIBIOS_SUCCESSFUL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Olof Johansson | 119 | 96.75% | 2 | 66.67% |
| Al Viro | 4 | 3.25% | 1 | 33.33% |
| Total | 123 | 100.00% | 3 | 100.00% |
static struct pci_ops pa_pxp_ops = {
.read = pa_pxp_read_config,
.write = pa_pxp_write_config,
};
static void __init setup_pa_pxp(struct pci_controller *hose)
{
hose->ops = &pa_pxp_ops;
hose->cfg_data = ioremap(0xe0000000, 0x10000000);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Olof Johansson | 30 | 100.00% | 1 | 100.00% |
| Total | 30 | 100.00% | 1 | 100.00% |
static int __init pas_add_bridge(struct device_node *dev)
{
struct pci_controller *hose;
pr_debug("Adding PCI host bridge %pOF\n", dev);
hose = pcibios_alloc_controller(dev);
if (!hose)
return -ENOMEM;
hose->first_busno = 0;
hose->last_busno = 0xff;
hose->controller_ops = pasemi_pci_controller_ops;
setup_pa_pxp(hose);
printk(KERN_INFO "Found PA-PXP PCI host bridge.\n");
/* Interpret the "ranges" property */
pci_process_bridge_OF_ranges(hose, dev, 1);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Olof Johansson | 74 | 90.24% | 1 | 25.00% |
| Daniel Axtens | 6 | 7.32% | 1 | 25.00% |
| Rob Herring | 1 | 1.22% | 1 | 25.00% |
| Arnd Bergmann | 1 | 1.22% | 1 | 25.00% |
| Total | 82 | 100.00% | 4 | 100.00% |
void __init pas_pci_init(void)
{
struct device_node *np, *root;
root = of_find_node_by_path("/");
if (!root) {
printk(KERN_CRIT "pas_pci_init: can't find root "
"of device tree\n");
return;
}
for (np = NULL; (np = of_get_next_child(root, np)) != NULL;)
if (np->name && !strcmp(np->name, "pxp") && !pas_add_bridge(np))
of_node_get(np);
of_node_put(root);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Olof Johansson | 89 | 98.89% | 1 | 50.00% |
| Arnd Bergmann | 1 | 1.11% | 1 | 50.00% |
| Total | 90 | 100.00% | 2 | 100.00% |
void __iomem *pasemi_pci_getcfgaddr(struct pci_dev *dev, int offset)
{
struct pci_controller *hose;
hose = pci_bus_to_host(dev->bus);
return (void __iomem *)pa_pxp_cfg_addr(hose, dev->bus->number, dev->devfn, offset);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Olof Johansson | 52 | 100.00% | 2 | 100.00% |
| Total | 52 | 100.00% | 2 | 100.00% |
struct pci_controller_ops pasemi_pci_controller_ops;
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Olof Johansson | 904 | 96.38% | 4 | 44.44% |
| Daniel Axtens | 13 | 1.39% | 1 | 11.11% |
| Al Viro | 12 | 1.28% | 1 | 11.11% |
| Nathan T. Lynch | 6 | 0.64% | 1 | 11.11% |
| Arnd Bergmann | 2 | 0.21% | 1 | 11.11% |
| Rob Herring | 1 | 0.11% | 1 | 11.11% |
| Total | 938 | 100.00% | 9 | 100.00% |
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