xref: /openbmc/linux/drivers/tty/serial/apbuart.h (revision b2441318)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __GRLIB_APBUART_H__
3 #define __GRLIB_APBUART_H__
4 
5 #include <asm/io.h>
6 
7 #define UART_NR		8
8 static int grlib_apbuart_port_nr;
9 
10 struct grlib_apbuart_regs_map {
11 	u32 data;
12 	u32 status;
13 	u32 ctrl;
14 	u32 scaler;
15 };
16 
17 struct amba_prom_registers {
18 	unsigned int phys_addr;
19 	unsigned int reg_size;
20 };
21 
22 /*
23  *  The following defines the bits in the APBUART Status Registers.
24  */
25 #define UART_STATUS_DR   0x00000001	/* Data Ready */
26 #define UART_STATUS_TSE  0x00000002	/* TX Send Register Empty */
27 #define UART_STATUS_THE  0x00000004	/* TX Hold Register Empty */
28 #define UART_STATUS_BR   0x00000008	/* Break Error */
29 #define UART_STATUS_OE   0x00000010	/* RX Overrun Error */
30 #define UART_STATUS_PE   0x00000020	/* RX Parity Error */
31 #define UART_STATUS_FE   0x00000040	/* RX Framing Error */
32 #define UART_STATUS_ERR  0x00000078	/* Error Mask */
33 
34 /*
35  *  The following defines the bits in the APBUART Ctrl Registers.
36  */
37 #define UART_CTRL_RE     0x00000001	/* Receiver enable */
38 #define UART_CTRL_TE     0x00000002	/* Transmitter enable */
39 #define UART_CTRL_RI     0x00000004	/* Receiver interrupt enable */
40 #define UART_CTRL_TI     0x00000008	/* Transmitter irq */
41 #define UART_CTRL_PS     0x00000010	/* Parity select */
42 #define UART_CTRL_PE     0x00000020	/* Parity enable */
43 #define UART_CTRL_FL     0x00000040	/* Flow control enable */
44 #define UART_CTRL_LB     0x00000080	/* Loopback enable */
45 
46 #define APBBASE(port) ((struct grlib_apbuart_regs_map *)((port)->membase))
47 
48 #define APBBASE_DATA_P(port)	(&(APBBASE(port)->data))
49 #define APBBASE_STATUS_P(port)	(&(APBBASE(port)->status))
50 #define APBBASE_CTRL_P(port)	(&(APBBASE(port)->ctrl))
51 #define APBBASE_SCALAR_P(port)	(&(APBBASE(port)->scaler))
52 
53 #define UART_GET_CHAR(port)	(__raw_readl(APBBASE_DATA_P(port)))
54 #define UART_PUT_CHAR(port, v)	(__raw_writel(v, APBBASE_DATA_P(port)))
55 #define UART_GET_STATUS(port)	(__raw_readl(APBBASE_STATUS_P(port)))
56 #define UART_PUT_STATUS(port, v)(__raw_writel(v, APBBASE_STATUS_P(port)))
57 #define UART_GET_CTRL(port)	(__raw_readl(APBBASE_CTRL_P(port)))
58 #define UART_PUT_CTRL(port, v)	(__raw_writel(v, APBBASE_CTRL_P(port)))
59 #define UART_GET_SCAL(port)	(__raw_readl(APBBASE_SCALAR_P(port)))
60 #define UART_PUT_SCAL(port, v)	(__raw_writel(v, APBBASE_SCALAR_P(port)))
61 
62 #define UART_RX_DATA(s)		(((s) & UART_STATUS_DR) != 0)
63 #define UART_TX_READY(s)	(((s) & UART_STATUS_THE) != 0)
64 
65 #endif /* __GRLIB_APBUART_H__ */
66