mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 17:54:13 +08:00
0d5a6db3aa
This commit adds a very basic registry of msi_chip structures, so that an IRQ controller driver can register an msi_chip, and a PCIe host controller can find it, based on a 'struct device_node'. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
#include <linux/kernel.h>
|
|
#include <linux/export.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_pci.h>
|
|
#include <asm/prom.h>
|
|
|
|
static inline int __of_pci_pci_compare(struct device_node *node,
|
|
unsigned int data)
|
|
{
|
|
int devfn;
|
|
|
|
devfn = of_pci_get_devfn(node);
|
|
if (devfn < 0)
|
|
return 0;
|
|
|
|
return devfn == data;
|
|
}
|
|
|
|
struct device_node *of_pci_find_child_device(struct device_node *parent,
|
|
unsigned int devfn)
|
|
{
|
|
struct device_node *node, *node2;
|
|
|
|
for_each_child_of_node(parent, node) {
|
|
if (__of_pci_pci_compare(node, devfn))
|
|
return node;
|
|
/*
|
|
* Some OFs create a parent node "multifunc-device" as
|
|
* a fake root for all functions of a multi-function
|
|
* device we go down them as well.
|
|
*/
|
|
if (!strcmp(node->name, "multifunc-device")) {
|
|
for_each_child_of_node(node, node2) {
|
|
if (__of_pci_pci_compare(node2, devfn)) {
|
|
of_node_put(node);
|
|
return node2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_pci_find_child_device);
|
|
|
|
/**
|
|
* of_pci_get_devfn() - Get device and function numbers for a device node
|
|
* @np: device node
|
|
*
|
|
* Parses a standard 5-cell PCI resource and returns an 8-bit value that can
|
|
* be passed to the PCI_SLOT() and PCI_FUNC() macros to extract the device
|
|
* and function numbers respectively. On error a negative error code is
|
|
* returned.
|
|
*/
|
|
int of_pci_get_devfn(struct device_node *np)
|
|
{
|
|
unsigned int size;
|
|
const __be32 *reg;
|
|
|
|
reg = of_get_property(np, "reg", &size);
|
|
|
|
if (!reg || size < 5 * sizeof(__be32))
|
|
return -EINVAL;
|
|
|
|
return (be32_to_cpup(reg) >> 8) & 0xff;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_pci_get_devfn);
|
|
|
|
/**
|
|
* of_pci_parse_bus_range() - parse the bus-range property of a PCI device
|
|
* @node: device node
|
|
* @res: address to a struct resource to return the bus-range
|
|
*
|
|
* Returns 0 on success or a negative error-code on failure.
|
|
*/
|
|
int of_pci_parse_bus_range(struct device_node *node, struct resource *res)
|
|
{
|
|
const __be32 *values;
|
|
int len;
|
|
|
|
values = of_get_property(node, "bus-range", &len);
|
|
if (!values || len < sizeof(*values) * 2)
|
|
return -EINVAL;
|
|
|
|
res->name = node->name;
|
|
res->start = be32_to_cpup(values++);
|
|
res->end = be32_to_cpup(values);
|
|
res->flags = IORESOURCE_BUS;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
|
|
|
|
#ifdef CONFIG_PCI_MSI
|
|
|
|
static LIST_HEAD(of_pci_msi_chip_list);
|
|
static DEFINE_MUTEX(of_pci_msi_chip_mutex);
|
|
|
|
int of_pci_msi_chip_add(struct msi_chip *chip)
|
|
{
|
|
if (!of_property_read_bool(chip->of_node, "msi-controller"))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&of_pci_msi_chip_mutex);
|
|
list_add(&chip->list, &of_pci_msi_chip_list);
|
|
mutex_unlock(&of_pci_msi_chip_mutex);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_pci_msi_chip_add);
|
|
|
|
void of_pci_msi_chip_remove(struct msi_chip *chip)
|
|
{
|
|
mutex_lock(&of_pci_msi_chip_mutex);
|
|
list_del(&chip->list);
|
|
mutex_unlock(&of_pci_msi_chip_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_pci_msi_chip_remove);
|
|
|
|
struct msi_chip *of_pci_find_msi_chip_by_node(struct device_node *of_node)
|
|
{
|
|
struct msi_chip *c;
|
|
|
|
mutex_lock(&of_pci_msi_chip_mutex);
|
|
list_for_each_entry(c, &of_pci_msi_chip_list, list) {
|
|
if (c->of_node == of_node) {
|
|
mutex_unlock(&of_pci_msi_chip_mutex);
|
|
return c;
|
|
}
|
|
}
|
|
mutex_unlock(&of_pci_msi_chip_mutex);
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node);
|
|
|
|
#endif /* CONFIG_PCI_MSI */
|