[U-Boot] [PATCH 5/8] dm: pci: Add functions to emulate 8- and 16-bit access
Simon Glass
sjg at chromium.org
Sat Oct 17 19:50:02 CEST 2015
Provide a few functions to support using 32-bit access to emulate 8- and
16-bit access.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
drivers/pci/pci-uclass.c | 39 +++++++++++++++++++++++++++++++++++++++
include/pci.h | 31 +++++++++++++++++++++++++++++++
2 files changed, 70 insertions(+)
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index a59e468..1c6df0f 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -916,6 +916,45 @@ int pci_find_first_device(struct udevice **devp)
return skip_to_next_device(bus, devp);
}
+ulong pci_conv_32_to_size(ulong value, uint offset, enum pci_size_t size)
+{
+ switch (size) {
+ case PCI_SIZE_8:
+ return (value >> ((offset & 3) * 8)) & 0xff;
+ case PCI_SIZE_16:
+ return (value >> ((offset & 2) * 8)) & 0xffff;
+ default:
+ return value;
+ }
+}
+
+ulong pci_conv_size_to_32(ulong old, ulong value, uint offset,
+ enum pci_size_t size)
+{
+ uint off_mask;
+ uint val_mask, shift;
+ ulong ldata, mask;
+
+ switch (size) {
+ case PCI_SIZE_8:
+ off_mask = 3;
+ val_mask = 0xff;
+ break;
+ case PCI_SIZE_16:
+ off_mask = 2;
+ val_mask = 0xffff;
+ break;
+ default:
+ return value;
+ }
+ shift = (offset & off_mask) * 8;
+ ldata = (value & val_mask) << shift;
+ mask = val_mask << shift;
+ value = (old & ~mask) | ldata;
+
+ return value;
+}
+
UCLASS_DRIVER(pci) = {
.id = UCLASS_PCI,
.name = "pci",
diff --git a/include/pci.h b/include/pci.h
index e24c970..f40a83d 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 {
--
2.6.0.rc2.230.g3dd15c0
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