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 
led_print(int f,char * s)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 
xt2000_power_off(struct sys_off_data * unused)45 static int xt2000_power_off(struct sys_off_data *unused)
46 {
47 	led_print (0, "POWEROFF");
48 	local_irq_disable();
49 	while (1);
50 	return NOTIFY_DONE;
51 }
52 
xt2000_restart(struct notifier_block * this,unsigned long event,void * ptr)53 static int xt2000_restart(struct notifier_block *this,
54 			  unsigned long event, void *ptr)
55 {
56 	/* Flush and reset the mmu, simulate a processor reset, and
57 	 * jump to the reset vector. */
58 	cpu_reset();
59 
60 	return NOTIFY_DONE;
61 }
62 
63 static struct notifier_block xt2000_restart_block = {
64 	.notifier_call = xt2000_restart,
65 };
66 
platform_setup(char ** cmdline)67 void __init platform_setup(char** cmdline)
68 {
69 	led_print (0, "LINUX   ");
70 }
71 
72 /* Heartbeat. Let the LED blink. */
73 
74 static void xt2000_heartbeat(struct timer_list *unused);
75 
76 static DEFINE_TIMER(heartbeat_timer, xt2000_heartbeat);
77 
xt2000_heartbeat(struct timer_list * unused)78 static void xt2000_heartbeat(struct timer_list *unused)
79 {
80 	static int i;
81 
82 	led_print(7, i ? "." : " ");
83 	i ^= 1;
84 	mod_timer(&heartbeat_timer, jiffies + HZ / 2);
85 }
86 
87 //#define RS_TABLE_SIZE 2
88 
89 #define _SERIAL_PORT(_base,_irq)					\
90 {									\
91 	.mapbase	= (_base),					\
92 	.membase	= (void*)(_base),				\
93 	.irq		= (_irq),					\
94 	.uartclk	= DUART16552_XTAL_FREQ,				\
95 	.iotype		= UPIO_MEM,					\
96 	.flags		= UPF_BOOT_AUTOCONF,				\
97 	.regshift	= 2,						\
98 }
99 
100 static struct plat_serial8250_port xt2000_serial_data[] = {
101 #if XCHAL_HAVE_BE
102 	_SERIAL_PORT(DUART16552_1_ADDR + 3, DUART16552_1_INTNUM),
103 	_SERIAL_PORT(DUART16552_2_ADDR + 3, DUART16552_2_INTNUM),
104 #else
105 	_SERIAL_PORT(DUART16552_1_ADDR, DUART16552_1_INTNUM),
106 	_SERIAL_PORT(DUART16552_2_ADDR, DUART16552_2_INTNUM),
107 #endif
108 	{ }
109 };
110 
111 static struct platform_device xt2000_serial8250_device = {
112 	.name		= "serial8250",
113 	.id		= PLAT8250_DEV_PLATFORM,
114 	.dev		= {
115 	    .platform_data = xt2000_serial_data,
116 	},
117 };
118 
119 static struct resource xt2000_sonic_res[] = {
120 	{
121 		.start = SONIC83934_ADDR,
122 		.end   = SONIC83934_ADDR + 0xff,
123 		.flags = IORESOURCE_MEM,
124 	},
125 	{
126 		.start = SONIC83934_INTNUM,
127 		.end = SONIC83934_INTNUM,
128 		.flags = IORESOURCE_IRQ,
129 	},
130 };
131 
132 static struct platform_device xt2000_sonic_device = {
133 	.name		= "xtsonic",
134 	.num_resources	= ARRAY_SIZE(xt2000_sonic_res),
135 	.resource		= xt2000_sonic_res,
136 };
137 
xt2000_setup_devinit(void)138 static int __init xt2000_setup_devinit(void)
139 {
140 	platform_device_register(&xt2000_serial8250_device);
141 	platform_device_register(&xt2000_sonic_device);
142 	mod_timer(&heartbeat_timer, jiffies + HZ / 2);
143 	register_restart_handler(&xt2000_restart_block);
144 	register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
145 				 SYS_OFF_PRIO_DEFAULT,
146 				 xt2000_power_off, NULL);
147 	return 0;
148 }
149 
150 device_initcall(xt2000_setup_devinit);
151