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linux/arch/mips/pci/ops-pnx8550.c
Yoann Padioleau 7e5829b56b [MIPS] 0 -> NULL 
When comparing a pointer, it's clearer to compare it to NULL than to 0.

Here is an excerpt of the semantic patch:

@@
expression *E;
@@

  E ==
- 0
+ NULL

@@
expression *E;
@@

  E !=
- 0
+ NULL

Signed-off-by: Yoann Padioleau <padator@wanadoo.fr>
Cc: ralf@linux-mips.org
Cc: linux-mips@linux-mips.org
Cc: akpm@linux-foundation.org
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-07-31 21:35:22 +01:00

285 lines
6.3 KiB
C
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/*
*
* BRIEF MODULE DESCRIPTION
*
* 2.6 port, Embedded Alley Solutions, Inc
*
* Based on:
* Author: source@mvista.com
*
* This program is free software; you can distribute 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 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/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <asm/mach-pnx8550/pci.h>
#include <asm/mach-pnx8550/glb.h>
#include <asm/debug.h>
static inline void clear_status(void)
{
unsigned long pci_stat;
pci_stat = inl(PCI_BASE | PCI_GPPM_STATUS);
outl(pci_stat, PCI_BASE | PCI_GPPM_ICLR);
}
static inline unsigned int
calc_cfg_addr(struct pci_bus *bus, unsigned int devfn, int where)
{
unsigned int addr;
addr = ((bus->number > 0) ? (((bus->number & 0xff) << PCI_CFG_BUS_SHIFT) | 1) : 0);
addr |= ((devfn & 0xff) << PCI_CFG_FUNC_SHIFT) | (where & 0xfc);
return addr;
}
static int
config_access(unsigned int pci_cmd, struct pci_bus *bus, unsigned int devfn, int where, unsigned int pci_mode, unsigned int *val)
{
unsigned int flags;
unsigned long loops = 0;
unsigned long ioaddr = calc_cfg_addr(bus, devfn, where);
local_irq_save(flags);
/*Clear pending interrupt status */
if (inl(PCI_BASE | PCI_GPPM_STATUS)) {
clear_status();
while (!(inl(PCI_BASE | PCI_GPPM_STATUS) == 0)) ;
}
outl(ioaddr, PCI_BASE | PCI_GPPM_ADDR);
if ((pci_cmd == PCI_CMD_IOW) || (pci_cmd == PCI_CMD_CONFIG_WRITE))
outl(*val, PCI_BASE | PCI_GPPM_WDAT);
outl(INIT_PCI_CYCLE | pci_cmd | (pci_mode & PCI_BYTE_ENABLE_MASK),
PCI_BASE | PCI_GPPM_CTRL);
loops =
((loops_per_jiffy *
PCI_IO_JIFFIES_TIMEOUT) >> (PCI_IO_JIFFIES_SHIFT));
while (1) {
if (inl(PCI_BASE | PCI_GPPM_STATUS) & GPPM_DONE) {
if ((pci_cmd == PCI_CMD_IOR) ||
(pci_cmd == PCI_CMD_CONFIG_READ))
*val = inl(PCI_BASE | PCI_GPPM_RDAT);
clear_status();
local_irq_restore(flags);
return PCIBIOS_SUCCESSFUL;
} else if (inl(PCI_BASE | PCI_GPPM_STATUS) & GPPM_R_MABORT) {
break;
}
loops--;
if (loops == 0) {
printk("%s : Arbiter Locked.\n", __FUNCTION__);
}
}
clear_status();
if ((pci_cmd == PCI_CMD_IOR) || (pci_cmd == PCI_CMD_IOW)) {
printk("%s timeout (GPPM_CTRL=%X) ioaddr %lX pci_cmd %X\n",
__FUNCTION__, inl(PCI_BASE | PCI_GPPM_CTRL), ioaddr,
pci_cmd);
}
if ((pci_cmd == PCI_CMD_IOR) || (pci_cmd == PCI_CMD_CONFIG_READ))
*val = 0xffffffff;
local_irq_restore(flags);
return PCIBIOS_DEVICE_NOT_FOUND;
}
/*
* We can't address 8 and 16 bit words directly. Instead we have to
* read/write a 32bit word and mask/modify the data we actually want.
*/
static int
read_config_byte(struct pci_bus *bus, unsigned int devfn, int where, u8 * val)
{
unsigned int data = 0;
int err;
if (bus == NULL)
return -1;
err = config_access(PCI_CMD_CONFIG_READ, bus, devfn, where, ~(1 << (where & 3)), &data);
switch (where & 0x03) {
case 0:
*val = (unsigned char)(data & 0x000000ff);
break;
case 1:
*val = (unsigned char)((data & 0x0000ff00) >> 8);
break;
case 2:
*val = (unsigned char)((data & 0x00ff0000) >> 16);
break;
case 3:
*val = (unsigned char)((data & 0xff000000) >> 24);
break;
}
return err;
}
static int
read_config_word(struct pci_bus *bus, unsigned int devfn, int where, u16 * val)
{
unsigned int data = 0;
int err;
if (bus == NULL)
return -1;
if (where & 0x01)
return PCIBIOS_BAD_REGISTER_NUMBER;
err = config_access(PCI_CMD_CONFIG_READ, bus, devfn, where, ~(3 << (where & 3)), &data);
switch (where & 0x02) {
case 0:
*val = (unsigned short)(data & 0x0000ffff);
break;
case 2:
*val = (unsigned short)((data & 0xffff0000) >> 16);
break;
}
return err;
}
static int
read_config_dword(struct pci_bus *bus, unsigned int devfn, int where, u32 * val)
{
int err;
if (bus == NULL)
return -1;
if (where & 0x03)
return PCIBIOS_BAD_REGISTER_NUMBER;
err = config_access(PCI_CMD_CONFIG_READ, bus, devfn, where, 0, val);
return err;
}
static int
write_config_byte(struct pci_bus *bus, unsigned int devfn, int where, u8 val)
{
unsigned int data = (unsigned int)val;
int err;
if (bus == NULL)
return -1;
switch (where & 0x03) {
case 1:
data = (data << 8);
break;
case 2:
data = (data << 16);
break;
case 3:
data = (data << 24);
break;
default:
break;
}
err = config_access(PCI_CMD_CONFIG_WRITE, bus, devfn, where, ~(1 << (where & 3)), &data);
return err;
}
static int
write_config_word(struct pci_bus *bus, unsigned int devfn, int where, u16 val)
{
unsigned int data = (unsigned int)val;
int err;
if (bus == NULL)
return -1;
if (where & 0x01)
return PCIBIOS_BAD_REGISTER_NUMBER;
switch (where & 0x02) {
case 2:
data = (data << 16);
break;
default:
break;
}
err = config_access(PCI_CMD_CONFIG_WRITE, bus, devfn, where, ~(3 << (where & 3)), &data);
return err;
}
static int
write_config_dword(struct pci_bus *bus, unsigned int devfn, int where, u32 val)
{
int err;
if (bus == NULL)
return -1;
if (where & 0x03)
return PCIBIOS_BAD_REGISTER_NUMBER;
err = config_access(PCI_CMD_CONFIG_WRITE, bus, devfn, where, 0, &val);
return err;
}
static int config_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 * val)
{
switch (size) {
case 1: {
u8 _val;
int rc = read_config_byte(bus, devfn, where, &_val);
*val = _val;
return rc;
}
case 2: {
u16 _val;
int rc = read_config_word(bus, devfn, where, &_val);
*val = _val;
return rc;
}
default:
return read_config_dword(bus, devfn, where, val);
}
}
static int config_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
{
switch (size) {
case 1:
return write_config_byte(bus, devfn, where, (u8) val);
case 2:
return write_config_word(bus, devfn, where, (u16) val);
default:
return write_config_dword(bus, devfn, where, val);
}
}
struct pci_ops pnx8550_pci_ops = {
config_read,
config_write
};
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