1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2003, Axis Communications AB.
6 #include <linux/console.h>
7 #include <linux/kernel.h>
8 #include <linux/init.h>
9 #include <linux/string.h>
10 #include <hwregs/reg_rdwr.h>
11 #include <hwregs/reg_map.h>
12 #include <hwregs/ser_defs.h>
13 #include <hwregs/dma_defs.h>
14 #include <mach/pinmux.h>
19 unsigned long instance;
21 unsigned long baudrate;
26 struct dbg_port ports[] =
60 #if CONFIG_ETRAX_SERIAL_PORTS == 5
72 static struct dbg_port *port =
73 #if defined(CONFIG_ETRAX_DEBUG_PORT0)
75 #elif defined(CONFIG_ETRAX_DEBUG_PORT1)
77 #elif defined(CONFIG_ETRAX_DEBUG_PORT2)
79 #elif defined(CONFIG_ETRAX_DEBUG_PORT3)
85 #ifdef CONFIG_ETRAX_KGDB
86 static struct dbg_port *kgdb_port =
87 #if defined(CONFIG_ETRAX_KGDB_PORT0)
89 #elif defined(CONFIG_ETRAX_KGDB_PORT1)
91 #elif defined(CONFIG_ETRAX_KGDB_PORT2)
93 #elif defined(CONFIG_ETRAX_KGDB_PORT3)
95 #elif defined(CONFIG_ETRAX_KGDB_PORT4)
102 static void start_port(struct dbg_port *p)
104 /* Set up serial port registers */
105 reg_ser_rw_tr_ctrl tr_ctrl = {0};
106 reg_ser_rw_tr_dma_en tr_dma_en = {0};
108 reg_ser_rw_rec_ctrl rec_ctrl = {0};
109 reg_ser_rw_tr_baud_div tr_baud_div = {0};
110 reg_ser_rw_rec_baud_div rec_baud_div = {0};
112 if (!p || p->started)
118 crisv32_pinmux_alloc_fixed(pinmux_ser1);
119 else if (p->nbr == 2)
120 crisv32_pinmux_alloc_fixed(pinmux_ser2);
121 else if (p->nbr == 3)
122 crisv32_pinmux_alloc_fixed(pinmux_ser3);
123 #if CONFIG_ETRAX_SERIAL_PORTS == 5
124 else if (p->nbr == 4)
125 crisv32_pinmux_alloc_fixed(pinmux_ser4);
128 tr_ctrl.base_freq = rec_ctrl.base_freq = regk_ser_f29_493;
129 tr_dma_en.en = rec_ctrl.dma_mode = regk_ser_no;
130 tr_baud_div.div = rec_baud_div.div = 29493000 / p->baudrate / 8;
131 tr_ctrl.en = rec_ctrl.en = 1;
133 if (p->parity == 'O') {
134 tr_ctrl.par_en = regk_ser_yes;
135 tr_ctrl.par = regk_ser_odd;
136 rec_ctrl.par_en = regk_ser_yes;
137 rec_ctrl.par = regk_ser_odd;
138 } else if (p->parity == 'E') {
139 tr_ctrl.par_en = regk_ser_yes;
140 tr_ctrl.par = regk_ser_even;
141 rec_ctrl.par_en = regk_ser_yes;
142 rec_ctrl.par = regk_ser_odd;
146 tr_ctrl.data_bits = regk_ser_bits7;
147 rec_ctrl.data_bits = regk_ser_bits7;
150 REG_WR (ser, p->instance, rw_tr_baud_div, tr_baud_div);
151 REG_WR (ser, p->instance, rw_rec_baud_div, rec_baud_div);
152 REG_WR (ser, p->instance, rw_tr_dma_en, tr_dma_en);
153 REG_WR (ser, p->instance, rw_tr_ctrl, tr_ctrl);
154 REG_WR (ser, p->instance, rw_rec_ctrl, rec_ctrl);
157 #ifdef CONFIG_ETRAX_KGDB
158 /* Use polling to get a single character from the kernel debug port */
159 int getDebugChar(void)
161 reg_ser_rs_stat_din stat;
162 reg_ser_rw_ack_intr ack_intr = { 0 };
165 stat = REG_RD(ser, kgdb_port->instance, rs_stat_din);
168 /* Ack the data_avail interrupt. */
170 REG_WR(ser, kgdb_port->instance, rw_ack_intr, ack_intr);
175 /* Use polling to put a single character to the kernel debug port */
176 void putDebugChar(int val)
178 reg_ser_r_stat_din stat;
180 stat = REG_RD(ser, kgdb_port->instance, r_stat_din);
181 } while (!stat.tr_rdy);
182 REG_WR_INT(ser, kgdb_port->instance, rw_dout, val);
184 #endif /* CONFIG_ETRAX_KGDB */
186 static void __init early_putch(int c)
188 reg_ser_r_stat_din stat;
189 /* Wait until transmitter is ready and send. */
191 stat = REG_RD(ser, port->instance, r_stat_din);
192 while (!stat.tr_rdy);
193 REG_WR_INT(ser, port->instance, rw_dout, c);
197 early_console_write(struct console *con, const char *s, unsigned n)
199 extern void reset_watchdog(void);
203 for (i = 0; i < n; i++) {
204 /* TODO: the '\n' -> '\n\r' translation should be done at the
205 receiver. Remove it when the serial driver removes it. */
213 static struct console early_console_dev __initdata = {
215 .write = early_console_write,
216 .flags = CON_PRINTBUFFER | CON_BOOT,
220 /* Register console for printk's, etc. */
221 int __init init_etrax_debug(void)
225 /* Register an early console if a debug port was chosen. */
226 register_console(&early_console_dev);
228 #ifdef CONFIG_ETRAX_KGDB
229 start_port(kgdb_port);
230 #endif /* CONFIG_ETRAX_KGDB */