1/*
2 * COM1 NS16550 support
3 */
4
5#include <linux/types.h>
6#include <linux/serial.h>
7#include <linux/serial_reg.h>
8#include <asm/serial.h>
9
10#if defined(CONFIG_XILINX_VIRTEX)
11#include <platforms/4xx/xparameters/xparameters.h>
12#endif
13#include "nonstdio.h"
14#include "serial.h"
15
16#define SERIAL_BAUD	9600
17
18extern unsigned long ISA_io;
19
20static struct serial_state rs_table[RS_TABLE_SIZE] = {
21	SERIAL_PORT_DFNS	/* Defined in <asm/serial.h> */
22};
23
24static int shift;
25
26unsigned long serial_init(int chan, void *ignored)
27{
28	unsigned long com_port, base_baud;
29	unsigned char lcr, dlm;
30
31	/* We need to find out which type io we're expecting.  If it's
32	 * 'SERIAL_IO_PORT', we get an offset from the isa_io_base.
33	 * If it's 'SERIAL_IO_MEM', we can the exact location.  -- Tom */
34	switch (rs_table[chan].io_type) {
35		case SERIAL_IO_PORT:
36			com_port = rs_table[chan].port;
37			break;
38		case SERIAL_IO_MEM:
39			com_port = (unsigned long)rs_table[chan].iomem_base;
40			break;
41		default:
42			/* We can't deal with it. */
43			return -1;
44	}
45
46	/* How far apart the registers are. */
47	shift = rs_table[chan].iomem_reg_shift;
48	/* Base baud.. */
49	base_baud = rs_table[chan].baud_base;
50
51	/* save the LCR */
52	lcr = inb(com_port + (UART_LCR << shift));
53	/* Access baud rate */
54	outb(com_port + (UART_LCR << shift), 0x80);
55	dlm = inb(com_port + (UART_DLM << shift));
56	/*
57	 * Test if serial port is unconfigured.
58	 * We assume that no-one uses less than 110 baud or
59	 * less than 7 bits per character these days.
60	 *  -- paulus.
61	 */
62
63	if ((dlm <= 4) && (lcr & 2))
64		/* port is configured, put the old LCR back */
65		outb(com_port + (UART_LCR << shift), lcr);
66	else {
67		/* Input clock. */
68		outb(com_port + (UART_DLL << shift),
69		     (base_baud / SERIAL_BAUD) & 0xFF);
70		outb(com_port + (UART_DLM << shift),
71		     (base_baud / SERIAL_BAUD) >> 8);
72		/* 8 data, 1 stop, no parity */
73		outb(com_port + (UART_LCR << shift), 0x03);
74		/* RTS/DTR */
75		outb(com_port + (UART_MCR << shift), 0x03);
76	}
77	/* Clear & enable FIFOs */
78	outb(com_port + (UART_FCR << shift), 0x07);
79
80	return (com_port);
81}
82
83void
84serial_putc(unsigned long com_port, unsigned char c)
85{
86	while ((inb(com_port + (UART_LSR << shift)) & UART_LSR_THRE) == 0)
87		;
88	outb(com_port, c);
89}
90
91unsigned char
92serial_getc(unsigned long com_port)
93{
94	while ((inb(com_port + (UART_LSR << shift)) & UART_LSR_DR) == 0)
95		;
96	return inb(com_port);
97}
98
99int
100serial_tstc(unsigned long com_port)
101{
102	return ((inb(com_port + (UART_LSR << shift)) & UART_LSR_DR) != 0);
103}
104