uart: pl011: Add support to ZTE ZX296702 uart

Support ZTE uart with some registers differing offset.
Probe as platform device for not AMBA IP ID is
available on ZTE uart.
Signed-off-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/Kconfig

@@ -47,12 +47,12 @@ config SERIAL_AMBA_PL010_CONSOLE
 
 config SERIAL_AMBA_PL011
 	tristate "ARM AMBA PL011 serial port support"
-	depends on ARM_AMBA
+	depends on ARM_AMBA || SOC_ZX296702
 	select SERIAL_CORE
 	help
 	  This selects the ARM(R) AMBA(R) PrimeCell PL011 UART.  If you have
 	  an Integrator/PP2, Integrator/CP or Versatile platform, say Y or M
-	  here.
+	  here. Say Y or M if you have SOC_ZX296702.
 
 	  If unsure, say N.
 

include/linux/amba/serial.h

@@ -33,12 +33,14 @@
 #define UART01x_DR		0x00	/* Data read or written from the interface. */
 #define UART01x_RSR		0x04	/* Receive status register (Read). */
 #define UART01x_ECR		0x04	/* Error clear register (Write). */
+#define ZX_UART01x_DR		0x04	/* Data read or written from the interface. */
 #define UART010_LCRH		0x08	/* Line control register, high byte. */
 #define ST_UART011_DMAWM	0x08    /* DMA watermark configure register. */
 #define UART010_LCRM		0x0C	/* Line control register, middle byte. */
 #define ST_UART011_TIMEOUT	0x0C    /* Timeout period register. */
 #define UART010_LCRL		0x10	/* Line control register, low byte. */
 #define UART010_CR		0x14	/* Control register. */
+#define ZX_UART01x_FR		0x14	/* Flag register (Read only). */
 #define UART01x_FR		0x18	/* Flag register (Read only). */
 #define UART010_IIR		0x1C	/* Interrupt identification register (Read). */
 #define UART010_ICR		0x1C	/* Interrupt clear register (Write). */
@@ -49,13 +51,21 @@
 #define UART011_LCRH		0x2c	/* Line control register. */
 #define ST_UART011_LCRH_TX	0x2c    /* Tx Line control register. */
 #define UART011_CR		0x30	/* Control register. */
+#define ZX_UART011_LCRH_TX	0x30    /* Tx Line control register. */
 #define UART011_IFLS		0x34	/* Interrupt fifo level select. */
+#define ZX_UART011_CR		0x34	/* Control register. */
+#define ZX_UART011_IFLS		0x38	/* Interrupt fifo level select. */
 #define UART011_IMSC		0x38	/* Interrupt mask. */
 #define UART011_RIS		0x3c	/* Raw interrupt status. */
 #define UART011_MIS		0x40	/* Masked interrupt status. */
+#define ZX_UART011_IMSC		0x40	/* Interrupt mask. */
 #define UART011_ICR		0x44	/* Interrupt clear register. */
+#define ZX_UART011_RIS		0x44	/* Raw interrupt status. */
 #define UART011_DMACR		0x48	/* DMA control register. */
+#define ZX_UART011_MIS		0x48	/* Masked interrupt status. */
+#define ZX_UART011_ICR		0x4c	/* Interrupt clear register. */
 #define ST_UART011_XFCR		0x50	/* XON/XOFF control register. */
+#define ZX_UART011_DMACR	0x50	/* DMA control register. */
 #define ST_UART011_XON1		0x54	/* XON1 register. */
 #define ST_UART011_XON2		0x58	/* XON2 register. */
 #define ST_UART011_XOFF1	0x5C	/* XON1 register. */
@@ -75,15 +85,19 @@
 #define UART01x_RSR_PE 		0x02
 #define UART01x_RSR_FE 		0x01
 
+#define ZX_UART01x_FR_BUSY	0x300
 #define UART011_FR_RI		0x100
 #define UART011_FR_TXFE		0x080
 #define UART011_FR_RXFF		0x040
 #define UART01x_FR_TXFF		0x020
 #define UART01x_FR_RXFE		0x010
 #define UART01x_FR_BUSY		0x008
+#define ZX_UART01x_FR_DSR       0x008
 #define UART01x_FR_DCD 		0x004
 #define UART01x_FR_DSR 		0x002
+#define ZX_UART01x_FR_CTS	0x002
 #define UART01x_FR_CTS 		0x001
+#define ZX_UART011_FR_RI	0x001
 #define UART01x_FR_TMSK		(UART01x_FR_TXFF + UART01x_FR_BUSY)
 
 #define UART011_CR_CTSEN	0x8000	/* CTS hardware flow control */