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Subject[PATCH 12/13] devres: implement pcim_iomap_regions()
Date
From
Implement pcim_iomap_regions().  This function takes mask of BARs to
request and iomap. No BAR should have length of zero. BARs are
iomapped using pcim_iomap_table().

Signed-off-by: Tejun Heo <htejun@gmail.com>
---
include/linux/io.h | 2 +
lib/iomap.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 55 insertions(+), 0 deletions(-)
diff --git a/include/linux/io.h b/include/linux/io.h
index f5edf9c..45a9c94 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -45,6 +45,8 @@ void __iomem * pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen);
void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr);
void __iomem * const * pcim_iomap_table(struct pci_dev *pdev);

+int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name);
+
/**
* check_signature - find BIOS signatures
* @io_addr: mmio address to check
diff --git a/lib/iomap.c b/lib/iomap.c
index 3214028..4990c73 100644
--- a/lib/iomap.c
+++ b/lib/iomap.c
@@ -498,3 +498,56 @@ void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
WARN_ON(1);
}
EXPORT_SYMBOL(pcim_iounmap);
+
+/**
+ * pcim_iomap_regions - Request and iomap PCI BARs
+ * @pdev: PCI device to map IO resources for
+ * @mask: Mask of BARs to request and iomap
+ * @name: Name used when requesting regions
+ *
+ * Request and iomap regions specified by @mask.
+ */
+int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name)
+{
+ void __iomem * const *iomap;
+ int i, rc;
+
+ iomap = pcim_iomap_table(pdev);
+ if (!iomap)
+ return -ENOMEM;
+
+ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+ unsigned long len;
+
+ if (!(mask & (1 << i)))
+ continue;
+
+ rc = -EINVAL;
+ len = pci_resource_len(pdev, i);
+ if (!len)
+ goto err_inval;
+
+ rc = pci_request_region(pdev, i, name);
+ if (rc)
+ goto err_region;
+
+ rc = -ENOMEM;
+ if (!pcim_iomap(pdev, i, 0))
+ goto err_iomap;
+ }
+
+ return 0;
+
+ err_iomap:
+ pcim_iounmap(pdev, iomap[i]);
+ err_region:
+ pci_release_region(pdev, i);
+ err_inval:
+ while (--i >= 0) {
+ pcim_iounmap(pdev, iomap[i]);
+ pci_release_region(pdev, i);
+ }
+
+ return rc;
+}
+EXPORT_SYMBOL(pcim_iomap_regions);
--
1.4.4.3

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