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authorSimon Glass <sjg@chromium.org>2015-01-27 22:13:27 -0700
committerSimon Glass <sjg@chromium.org>2015-02-05 22:16:42 -0700
commit250e039da8c7e485dabdc84f0457b2a901757e28 (patch)
tree0ca867115a43018fa6bb64e43e0791219eb1239c /drivers/pci
parentcfcf8ea2d7d35c25ef9c7d2a6b8063e7123818b7 (diff)
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pci: Add a function to find a device by class
There is an existing function prototype in the header file but it is not implemented. Implement something similar. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/pci.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 950a247..e1296ca 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -15,6 +15,7 @@
#include <common.h>
#include <command.h>
+#include <errno.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <pci.h>
@@ -236,6 +237,48 @@ pci_dev_t pci_find_devices(struct pci_device_id *ids, int index)
return -1;
}
+pci_dev_t pci_find_class(uint find_class, int index)
+{
+ int bus;
+ int devnum;
+ pci_dev_t bdf;
+ uint32_t class;
+
+ for (bus = 0; bus <= pci_last_busno(); bus++) {
+ for (devnum = 0; devnum < PCI_MAX_PCI_DEVICES - 1; devnum++) {
+ pci_read_config_dword(PCI_BDF(bus, devnum, 0),
+ PCI_CLASS_REVISION, &class);
+ if (class >> 16 == 0xffff)
+ continue;
+
+ for (bdf = PCI_BDF(bus, devnum, 0);
+ bdf <= PCI_BDF(bus, devnum,
+ PCI_MAX_PCI_FUNCTIONS - 1);
+ bdf += PCI_BDF(0, 0, 1)) {
+ pci_read_config_dword(bdf, PCI_CLASS_REVISION,
+ &class);
+ class >>= 8;
+
+ if (class != find_class)
+ continue;
+ /*
+ * Decrement the index. We want to return the
+ * correct device, so index is 0 for the first
+ * matching device, 1 for the second, etc.
+ */
+ if (index) {
+ index--;
+ continue;
+ }
+ /* Return index'th controller. */
+ return bdf;
+ }
+ }
+ }
+
+ return -ENODEV;
+}
+
pci_dev_t pci_find_device(unsigned int vendor, unsigned int device, int index)
{
struct pci_device_id ids[2] = { {}, {0, 0} };