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sh: pci: Use a generic raw spinlock for PCI config access locking.

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This copies the pci_config_lock idea from x86 over, allowing us to kill
off a couple of existing private locks. At the same time, these need to
be converted to raw spinlocks for -rt kernels, so we make that change at
the same time. This should make it easier for future parts to get the
locking right instead of inevitable ending up with lock type mismatches.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2010-09-20 18:56:13 +09:00
parent c524ebf5a6
commit 39a90865f0
4 changed files with 17 additions and 12 deletions
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11
arch/sh/drivers/pci/ops-sh4.c
View file

@ -9,6 +9,7 @@
*/
#include <linux/pci.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <asm/addrspace.h>
#include "pci-sh4.h"
@ -18,8 +19,6 @@
#define CONFIG_CMD(bus, devfn, where) \
(0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))
static DEFINE_SPINLOCK(sh4_pci_lock);
/*
* Functions for accessing PCI configuration space with type 1 accesses
*/
@ -34,10 +33,10 @@ static int sh4_pci_read(struct pci_bus *bus, unsigned int devfn,
* PCIPDR may only be accessed as 32 bit words,
* so we must do byte alignment by hand
*/
spin_lock_irqsave(&sh4_pci_lock, flags);
raw_spin_lock_irqsave(&pci_config_lock, flags);
pci_write_reg(chan, CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
data = pci_read_reg(chan, SH4_PCIPDR);
spin_unlock_irqrestore(&sh4_pci_lock, flags);
raw_spin_unlock_irqrestore(&pci_config_lock, flags);
switch (size) {
case 1:
@ -69,10 +68,10 @@ static int sh4_pci_write(struct pci_bus *bus, unsigned int devfn,
int shift;
u32 data;
spin_lock_irqsave(&sh4_pci_lock, flags);
raw_spin_lock_irqsave(&pci_config_lock, flags);
pci_write_reg(chan, CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
data = pci_read_reg(chan, SH4_PCIPDR);
spin_unlock_irqrestore(&sh4_pci_lock, flags);
raw_spin_unlock_irqrestore(&pci_config_lock, flags);
switch (size) {
case 1:

10
arch/sh/drivers/pci/ops-sh7786.c
View file

@ -19,8 +19,6 @@ enum {
PCI_ACCESS_WRITE,
};
static DEFINE_SPINLOCK(sh7786_pcie_lock);
static int sh7786_pcie_config_access(unsigned char access_type,
struct pci_bus *bus, unsigned int devfn, int where, u32 *data)
{
@ -103,7 +101,7 @@ static int sh7786_pcie_read(struct pci_bus *bus, unsigned int devfn,
else if ((size == 4) && (where & 3))
return PCIBIOS_BAD_REGISTER_NUMBER;
spin_lock_irqsave(&sh7786_pcie_lock, flags);
raw_spin_lock_irqsave(&pci_config_lock, flags);
ret = sh7786_pcie_config_access(PCI_ACCESS_READ, bus,
devfn, where, &data);
if (ret != PCIBIOS_SUCCESSFUL) {
@ -123,7 +121,7 @@ static int sh7786_pcie_read(struct pci_bus *bus, unsigned int devfn,
devfn, where, size, (unsigned long)*val);
out:
spin_unlock_irqrestore(&sh7786_pcie_lock, flags);
raw_spin_unlock_irqrestore(&pci_config_lock, flags);
return ret;
}
@ -139,7 +137,7 @@ static int sh7786_pcie_write(struct pci_bus *bus, unsigned int devfn,
else if ((size == 4) && (where & 3))
return PCIBIOS_BAD_REGISTER_NUMBER;
spin_lock_irqsave(&sh7786_pcie_lock, flags);
raw_spin_lock_irqsave(&pci_config_lock, flags);
ret = sh7786_pcie_config_access(PCI_ACCESS_READ, bus,
devfn, where, &data);
if (ret != PCIBIOS_SUCCESSFUL)
@ -163,7 +161,7 @@ static int sh7786_pcie_write(struct pci_bus *bus, unsigned int devfn,
ret = sh7786_pcie_config_access(PCI_ACCESS_WRITE, bus,
devfn, where, &data);
out:
spin_unlock_irqrestore(&sh7786_pcie_lock, flags);
raw_spin_unlock_irqrestore(&pci_config_lock, flags);
return ret;
}

6
arch/sh/drivers/pci/pci.c
View file

@ -19,6 +19,7 @@
#include <linux/dma-debug.h>
#include <linux/io.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
unsigned long PCIBIOS_MIN_IO = 0x0000;
unsigned long PCIBIOS_MIN_MEM = 0;
@ -56,6 +57,11 @@ static void __devinit pcibios_scanbus(struct pci_channel *hose)
}
}
/*
* This interrupt-safe spinlock protects all accesses to PCI
* configuration space.
*/
DEFINE_RAW_SPINLOCK(pci_config_lock);
static DEFINE_MUTEX(pci_scan_mutex);
int __devinit register_pci_controller(struct pci_channel *hose)

2
arch/sh/include/asm/pci.h
View file

@ -37,6 +37,8 @@ struct pci_channel {
};
/* arch/sh/drivers/pci/pci.c */
extern raw_spinlock_t pci_config_lock;
extern int register_pci_controller(struct pci_channel *hose);
extern void pcibios_report_status(unsigned int status_mask, int warn);