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authorSimon Glass <sjg@chromium.org>2015-11-19 20:26:59 -0700
committerSimon Glass <sjg@chromium.org>2015-12-01 06:26:36 -0700
commit9289db6c60bc9caa285fc6459db9236d92ba94f6 (patch)
tree6c97113a29067d087d2a0f0c68c57253a5756e3d /include/pci.h
parent9526d83ac5a39bfa3dc4c07a242aa052093744b5 (diff)
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dm: pci: Add functions to emulate 8- and 16-bit access
Provide a few functions to support using 32-bit access to emulate 8- and 16-bit access. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Stephen Warren <swarren@nvidia.com> Tested-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'include/pci.h')
-rw-r--r--include/pci.h31
1 files changed, 31 insertions, 0 deletions
diff --git a/include/pci.h b/include/pci.h
index ed135a5..ec2d104 100644
--- a/include/pci.h
+++ b/include/pci.h
@@ -1092,6 +1092,37 @@ static inline int pci_read_config_byte(pci_dev_t pcidev, int offset,
}
/**
+ * pci_conv_32_to_size() - convert a 32-bit read value to the given size
+ *
+ * Some PCI buses must always perform 32-bit reads. The data must then be
+ * shifted and masked to reflect the required access size and offset. This
+ * function performs this transformation.
+ *
+ * @value: Value to transform (32-bit value read from @offset & ~3)
+ * @offset: Register offset that was read
+ * @size: Required size of the result
+ * @return the value that would have been obtained if the read had been
+ * performed at the given offset with the correct size
+ */
+ulong pci_conv_32_to_size(ulong value, uint offset, enum pci_size_t size);
+
+/**
+ * pci_conv_size_to_32() - update a 32-bit value to prepare for a write
+ *
+ * Some PCI buses must always perform 32-bit writes. To emulate a smaller
+ * write the old 32-bit data must be read, updated with the required new data
+ * and written back as a 32-bit value. This function performs the
+ * transformation from the old value to the new value.
+ *
+ * @value: Value to transform (32-bit value read from @offset & ~3)
+ * @offset: Register offset that should be written
+ * @size: Required size of the write
+ * @return the value that should be written as a 32-bit access to @offset & ~3.
+ */
+ulong pci_conv_size_to_32(ulong old, ulong value, uint offset,
+ enum pci_size_t size);
+
+/**
* struct dm_pci_emul_ops - PCI device emulator operations
*/
struct dm_pci_emul_ops {