tty: amba-pl011: add support for ZTE UART (EXPERIMENTAL)

Add (incomplete) support for the ZTE UART to the AMBA PL011 driver.
This is similar to the ARM and ST variants, except it has a different
register address layout, and requires 32-bit accesses to the registers.
Use the newly introduced register tables and access size support to
cope with these differences.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/include/linux/amba/serial.h b/include/linux/amba/serial.h
index 0ddb5c02ad8b..d76a19ba2cff 100644
--- a/include/linux/amba/serial.h
+++ b/include/linux/amba/serial.h
@@ -65,6 +65,24 @@
 #define ST_UART011_ABCR         0x100   /* Autobaud control register. */
 #define ST_UART011_ABIMSC       0x15C   /* Autobaud interrupt mask/clear register. */
 
+/*
+ * ZTE UART register offsets.  This UART has a radically different address
+ * allocation from the ARM and ST variants, so we list all registers here.
+ * We assume unlisted registers do not exist.
+ */
+#define ZX_UART011_DR           0x04
+#define ZX_UART011_FR           0x14
+#define ZX_UART011_IBRD         0x24
+#define ZX_UART011_FBRD         0x28
+#define ZX_UART011_LCRH         0x30
+#define ZX_UART011_CR           0x34
+#define ZX_UART011_IFLS         0x38
+#define ZX_UART011_IMSC         0x40
+#define ZX_UART011_RIS          0x44
+#define ZX_UART011_MIS          0x48
+#define ZX_UART011_ICR          0x4c
+#define ZX_UART011_DMACR        0x50
+
 #define UART011_DR_OE           (1 << 11)
 #define UART011_DR_BE           (1 << 10)
 #define UART011_DR_PE           (1 << 9)