1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * arch/xtensa/platforms/xt2000/setup.c
4  *
5  * Platform specific functions for the XT2000 board.
6  *
7  * Authors:	Chris Zankel <chris@zankel.net>
8  *		Joe Taylor <joe@tensilica.com>
9  *
10  * Copyright 2001 - 2004 Tensilica Inc.
11  */
12 #include <linux/stddef.h>
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/errno.h>
16 #include <linux/reboot.h>
17 #include <linux/kdev_t.h>
18 #include <linux/types.h>
19 #include <linux/major.h>
20 #include <linux/console.h>
21 #include <linux/delay.h>
22 #include <linux/stringify.h>
23 #include <linux/platform_device.h>
24 #include <linux/serial.h>
25 #include <linux/serial_8250.h>
26 #include <linux/timer.h>
27 
28 #include <asm/processor.h>
29 #include <asm/platform.h>
30 #include <asm/bootparam.h>
31 #include <platform/hardware.h>
32 #include <platform/serial.h>
33 
34 /* Assumes s points to an 8-chr string.  No checking for NULL. */
35 
36 static void led_print (int f, char *s)
37 {
38 	unsigned long* led_addr = (unsigned long*) (XT2000_LED_ADDR + 0xE0) + f;
39 	int i;
40 	for (i = f; i < 8; i++)
41 		if ((*led_addr++ = *s++) == 0)
42 		    break;
43 }
44 
45 void platform_halt(void)
46 {
47 	led_print (0, "  HALT  ");
48 	local_irq_disable();
49 	while (1);
50 }
51 
52 void platform_power_off(void)
53 {
54 	led_print (0, "POWEROFF");
55 	local_irq_disable();
56 	while (1);
57 }
58 
59 static int xt2000_restart(struct notifier_block *this,
60 			  unsigned long event, void *ptr)
61 {
62 	/* Flush and reset the mmu, simulate a processor reset, and
63 	 * jump to the reset vector. */
64 	cpu_reset();
65 
66 	return NOTIFY_DONE;
67 }
68 
69 static struct notifier_block xt2000_restart_block = {
70 	.notifier_call = xt2000_restart,
71 };
72 
73 void __init platform_setup(char** cmdline)
74 {
75 	led_print (0, "LINUX   ");
76 }
77 
78 /* Heartbeat. Let the LED blink. */
79 
80 static void xt2000_heartbeat(struct timer_list *unused);
81 
82 static DEFINE_TIMER(heartbeat_timer, xt2000_heartbeat);
83 
84 static void xt2000_heartbeat(struct timer_list *unused)
85 {
86 	static int i;
87 
88 	led_print(7, i ? "." : " ");
89 	i ^= 1;
90 	mod_timer(&heartbeat_timer, jiffies + HZ / 2);
91 }
92 
93 //#define RS_TABLE_SIZE 2
94 
95 #define _SERIAL_PORT(_base,_irq)					\
96 {									\
97 	.mapbase	= (_base),					\
98 	.membase	= (void*)(_base),				\
99 	.irq		= (_irq),					\
100 	.uartclk	= DUART16552_XTAL_FREQ,				\
101 	.iotype		= UPIO_MEM,					\
102 	.flags		= UPF_BOOT_AUTOCONF,				\
103 	.regshift	= 2,						\
104 }
105 
106 static struct plat_serial8250_port xt2000_serial_data[] = {
107 #if XCHAL_HAVE_BE
108 	_SERIAL_PORT(DUART16552_1_ADDR + 3, DUART16552_1_INTNUM),
109 	_SERIAL_PORT(DUART16552_2_ADDR + 3, DUART16552_2_INTNUM),
110 #else
111 	_SERIAL_PORT(DUART16552_1_ADDR, DUART16552_1_INTNUM),
112 	_SERIAL_PORT(DUART16552_2_ADDR, DUART16552_2_INTNUM),
113 #endif
114 	{ }
115 };
116 
117 static struct platform_device xt2000_serial8250_device = {
118 	.name		= "serial8250",
119 	.id		= PLAT8250_DEV_PLATFORM,
120 	.dev		= {
121 	    .platform_data = xt2000_serial_data,
122 	},
123 };
124 
125 static struct resource xt2000_sonic_res[] = {
126 	{
127 		.start = SONIC83934_ADDR,
128 		.end   = SONIC83934_ADDR + 0xff,
129 		.flags = IORESOURCE_MEM,
130 	},
131 	{
132 		.start = SONIC83934_INTNUM,
133 		.end = SONIC83934_INTNUM,
134 		.flags = IORESOURCE_IRQ,
135 	},
136 };
137 
138 static struct platform_device xt2000_sonic_device = {
139 	.name		= "xtsonic",
140 	.num_resources	= ARRAY_SIZE(xt2000_sonic_res),
141 	.resource		= xt2000_sonic_res,
142 };
143 
144 static int __init xt2000_setup_devinit(void)
145 {
146 	platform_device_register(&xt2000_serial8250_device);
147 	platform_device_register(&xt2000_sonic_device);
148 	mod_timer(&heartbeat_timer, jiffies + HZ / 2);
149 	register_restart_handler(&xt2000_restart_block);
150 	return 0;
151 }
152 
153 device_initcall(xt2000_setup_devinit);
154