1 /*
2  *  linux/arch/m68k/sun3/config.c
3  *
4  *  Copyright (C) 1996,1997 Pekka Pietik{inen
5  *
6  * This file is subject to the terms and conditions of the GNU General Public
7  * License.  See the file COPYING in the main directory of this archive
8  * for more details.
9  */
10 
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/mm.h>
14 #include <linux/seq_file.h>
15 #include <linux/tty.h>
16 #include <linux/console.h>
17 #include <linux/init.h>
18 #include <linux/memblock.h>
19 #include <linux/platform_device.h>
20 
21 #include <asm/oplib.h>
22 #include <asm/setup.h>
23 #include <asm/contregs.h>
24 #include <asm/movs.h>
25 #include <asm/pgalloc.h>
26 #include <asm/sun3-head.h>
27 #include <asm/sun3mmu.h>
28 #include <asm/machdep.h>
29 #include <asm/machines.h>
30 #include <asm/idprom.h>
31 #include <asm/intersil.h>
32 #include <asm/irq.h>
33 #include <asm/sections.h>
34 #include <asm/sun3ints.h>
35 
36 char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
37 
38 static void sun3_sched_init(void);
39 extern void sun3_get_model (char* model);
40 extern int sun3_hwclk(int set, struct rtc_time *t);
41 
42 volatile char* clock_va;
43 extern unsigned long availmem;
44 unsigned long num_pages;
45 
sun3_get_hardware_list(struct seq_file * m)46 static void sun3_get_hardware_list(struct seq_file *m)
47 {
48 	seq_printf(m, "PROM Revision:\t%s\n", romvec->pv_monid);
49 }
50 
sun3_init(void)51 void __init sun3_init(void)
52 {
53 	unsigned char enable_register;
54 	int i;
55 
56 	m68k_machtype= MACH_SUN3;
57 	m68k_cputype = CPU_68020;
58 	m68k_fputype = FPU_68881; /* mc68881 actually */
59 	m68k_mmutype = MMU_SUN3;
60 	clock_va    =          (char *) 0xfe06000;	/* dark  */
61 	sun3_intreg = (unsigned char *) 0xfe0a000;	/* magic */
62 	sun3_disable_interrupts();
63 
64 	prom_init((void *)LINUX_OPPROM_BEGVM);
65 
66 	GET_CONTROL_BYTE(AC_SENABLE,enable_register);
67 	enable_register |= 0x50; /* Enable FPU */
68 	SET_CONTROL_BYTE(AC_SENABLE,enable_register);
69 	GET_CONTROL_BYTE(AC_SENABLE,enable_register);
70 
71 	/* This code looks suspicious, because it doesn't subtract
72            memory belonging to the kernel from the available space */
73 
74 
75 	memset(sun3_reserved_pmeg, 0, sizeof(sun3_reserved_pmeg));
76 
77 	/* Reserve important PMEGS */
78 	/* FIXME: These should be probed instead of hardcoded */
79 
80 	for (i=0; i<8; i++)		/* Kernel PMEGs */
81 		sun3_reserved_pmeg[i] = 1;
82 
83 	sun3_reserved_pmeg[247] = 1;	/* ROM mapping  */
84 	sun3_reserved_pmeg[248] = 1;	/* AMD Ethernet */
85 	sun3_reserved_pmeg[251] = 1;	/* VB area      */
86 	sun3_reserved_pmeg[254] = 1;	/* main I/O     */
87 
88 	sun3_reserved_pmeg[249] = 1;
89 	sun3_reserved_pmeg[252] = 1;
90 	sun3_reserved_pmeg[253] = 1;
91 	set_fc(USER_DATA);
92 }
93 
94 /* Without this, Bad Things happen when something calls arch_reset. */
sun3_reboot(void)95 static void sun3_reboot (void)
96 {
97 	prom_reboot ("vmlinux");
98 }
99 
sun3_halt(void)100 static void sun3_halt (void)
101 {
102 	prom_halt ();
103 }
104 
105 /* sun3 bootmem allocation */
106 
sun3_bootmem_alloc(unsigned long memory_start,unsigned long memory_end)107 static void __init sun3_bootmem_alloc(unsigned long memory_start,
108 				      unsigned long memory_end)
109 {
110 	unsigned long start_page;
111 
112 	/* align start/end to page boundaries */
113 	memory_start = ((memory_start + (PAGE_SIZE-1)) & PAGE_MASK);
114 	memory_end = memory_end & PAGE_MASK;
115 
116 	start_page = __pa(memory_start) >> PAGE_SHIFT;
117 	max_pfn = num_pages = __pa(memory_end) >> PAGE_SHIFT;
118 
119 	high_memory = (void *)memory_end;
120 	availmem = memory_start;
121 
122 	m68k_setup_node(0);
123 }
124 
125 
config_sun3(void)126 void __init config_sun3(void)
127 {
128 	unsigned long memory_start, memory_end;
129 
130 	pr_info("ARCH: SUN3\n");
131 	idprom_init();
132 
133 	/* Subtract kernel memory from available memory */
134 
135         mach_sched_init      =  sun3_sched_init;
136         mach_init_IRQ        =  sun3_init_IRQ;
137         mach_reset           =  sun3_reboot;
138 	mach_get_model	     =  sun3_get_model;
139 	mach_hwclk           =  sun3_hwclk;
140 	mach_halt	     =  sun3_halt;
141 	mach_get_hardware_list = sun3_get_hardware_list;
142 
143 	memory_start = ((((unsigned long)_end) + 0x2000) & ~0x1fff);
144 // PROM seems to want the last couple of physical pages. --m
145 	memory_end   = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE;
146 
147 	m68k_num_memory=1;
148         m68k_memory[0].size=*(romvec->pv_sun3mem);
149 
150 	sun3_bootmem_alloc(memory_start, memory_end);
151 }
152 
sun3_sched_init(void)153 static void __init sun3_sched_init(void)
154 {
155 	sun3_disable_interrupts();
156         intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_DISABLE|INTERSIL_24H_MODE);
157         intersil_clock->int_reg=INTERSIL_HZ_100_MASK;
158 	intersil_clear();
159         sun3_enable_irq(5);
160         intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE);
161         sun3_enable_interrupts();
162         intersil_clear();
163 }
164 
165 #if IS_ENABLED(CONFIG_SUN3_SCSI)
166 
167 static const struct resource sun3_scsi_vme_rsrc[] __initconst = {
168 	{
169 		.flags = IORESOURCE_IRQ,
170 		.start = SUN3_VEC_VMESCSI0,
171 		.end   = SUN3_VEC_VMESCSI0,
172 	}, {
173 		.flags = IORESOURCE_MEM,
174 		.start = 0xff200000,
175 		.end   = 0xff200021,
176 	}, {
177 		.flags = IORESOURCE_IRQ,
178 		.start = SUN3_VEC_VMESCSI1,
179 		.end   = SUN3_VEC_VMESCSI1,
180 	}, {
181 		.flags = IORESOURCE_MEM,
182 		.start = 0xff204000,
183 		.end   = 0xff204021,
184 	},
185 };
186 
187 /*
188  * Int: level 2 autovector
189  * IO: type 1, base 0x00140000, 5 bits phys space: A<4..0>
190  */
191 static const struct resource sun3_scsi_rsrc[] __initconst = {
192 	{
193 		.flags = IORESOURCE_IRQ,
194 		.start = 2,
195 		.end   = 2,
196 	}, {
197 		.flags = IORESOURCE_MEM,
198 		.start = 0x00140000,
199 		.end   = 0x0014001f,
200 	},
201 };
202 
sun3_platform_init(void)203 int __init sun3_platform_init(void)
204 {
205 	switch (idprom->id_machtype) {
206 	case SM_SUN3 | SM_3_160:
207 	case SM_SUN3 | SM_3_260:
208 		platform_device_register_simple("sun3_scsi_vme", -1,
209 			sun3_scsi_vme_rsrc, ARRAY_SIZE(sun3_scsi_vme_rsrc));
210 		break;
211 	case SM_SUN3 | SM_3_50:
212 	case SM_SUN3 | SM_3_60:
213 		platform_device_register_simple("sun3_scsi", -1,
214 			sun3_scsi_rsrc, ARRAY_SIZE(sun3_scsi_rsrc));
215 		break;
216 	}
217 	return 0;
218 }
219 
220 arch_initcall(sun3_platform_init);
221 
222 #endif
223