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dm: pci: Provide friendly config access functions

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At present there are no PCI functions which allow access to PCI
configuration using a struct udevice. This is a sad situation for driver
model as it makes use of PCI harder. Add these functions.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2015-08-10 07:05:03 -06:00
parent da60fb7934
commit 66afb4ed92
2 changed files with 94 additions and 0 deletions
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76
drivers/pci/pci-uclass.c
View file

@ -210,6 +210,17 @@ int pci_write_config(pci_dev_t bdf, int offset, unsigned long value,
return pci_bus_write_config(bus, bdf, offset, value, size);
}
int dm_pci_write_config(struct udevice *dev, int offset, unsigned long value,
enum pci_size_t size)
{
struct udevice *bus;
for (bus = dev; device_get_uclass_id(bus->parent) == UCLASS_PCI;)
bus = bus->parent;
return pci_bus_write_config(bus, pci_get_bdf(dev), offset, value, size);
}
int pci_write_config32(pci_dev_t bdf, int offset, u32 value)
{
return pci_write_config(bdf, offset, value, PCI_SIZE_32);
@ -225,6 +236,21 @@ int pci_write_config8(pci_dev_t bdf, int offset, u8 value)
return pci_write_config(bdf, offset, value, PCI_SIZE_8);
}
int dm_pci_write_config8(struct udevice *dev, int offset, u8 value)
{
return dm_pci_write_config(dev, offset, value, PCI_SIZE_8);
}
int dm_pci_write_config16(struct udevice *dev, int offset, u16 value)
{
return dm_pci_write_config(dev, offset, value, PCI_SIZE_16);
}
int dm_pci_write_config32(struct udevice *dev, int offset, u32 value)
{
return dm_pci_write_config(dev, offset, value, PCI_SIZE_32);
}
int pci_bus_read_config(struct udevice *bus, pci_dev_t bdf, int offset,
unsigned long *valuep, enum pci_size_t size)
{
@ -249,6 +275,17 @@ int pci_read_config(pci_dev_t bdf, int offset, unsigned long *valuep,
return pci_bus_read_config(bus, bdf, offset, valuep, size);
}
int dm_pci_read_config(struct udevice *dev, int offset, unsigned long *valuep,
enum pci_size_t size)
{
struct udevice *bus;
for (bus = dev; device_get_uclass_id(bus->parent) == UCLASS_PCI;)
bus = bus->parent;
return pci_bus_read_config(bus, pci_get_bdf(dev), offset, valuep,
size);
}
int pci_read_config32(pci_dev_t bdf, int offset, u32 *valuep)
{
unsigned long value;
@ -288,6 +325,45 @@ int pci_read_config8(pci_dev_t bdf, int offset, u8 *valuep)
return 0;
}
int dm_pci_read_config8(struct udevice *dev, int offset, u8 *valuep)
{
unsigned long value;
int ret;
ret = dm_pci_read_config(dev, offset, &value, PCI_SIZE_8);
if (ret)
return ret;
*valuep = value;
return 0;
}
int dm_pci_read_config16(struct udevice *dev, int offset, u16 *valuep)
{
unsigned long value;
int ret;
ret = dm_pci_read_config(dev, offset, &value, PCI_SIZE_16);
if (ret)
return ret;
*valuep = value;
return 0;
}
int dm_pci_read_config32(struct udevice *dev, int offset, u32 *valuep)
{
unsigned long value;
int ret;
ret = dm_pci_read_config(dev, offset, &value, PCI_SIZE_32);
if (ret)
return ret;
*valuep = value;
return 0;
}
int pci_auto_config_devices(struct udevice *bus)
{
struct pci_controller *hose = bus->uclass_priv;

18
include/pci.h
View file

@ -988,6 +988,24 @@ int pci_bus_read_config(struct udevice *bus, pci_dev_t bdf, int offset,
int pci_bus_write_config(struct udevice *bus, pci_dev_t bdf, int offset,
unsigned long value, enum pci_size_t size);
/**
* Driver model PCI config access functions. Use these in preference to others
* when you have a valid device
*/
int dm_pci_read_config(struct udevice *dev, int offset, unsigned long *valuep,
enum pci_size_t size);
int dm_pci_read_config8(struct udevice *dev, int offset, u8 *valuep);
int dm_pci_read_config16(struct udevice *dev, int offset, u16 *valuep);
int dm_pci_read_config32(struct udevice *dev, int offset, u32 *valuep);
int dm_pci_write_config(struct udevice *dev, int offset, unsigned long value,
enum pci_size_t size);
int dm_pci_write_config8(struct udevice *dev, int offset, u8 value);
int dm_pci_write_config16(struct udevice *dev, int offset, u16 value);
int dm_pci_write_config32(struct udevice *dev, int offset, u32 value);
/*
* The following functions provide access to the above without needing the
* size parameter. We are trying to encourage the use of the 8/16/32-style