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Linux/arch/m68k/sun3/config.c

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  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/bootmem.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/pgtable.h>
 26 #include <asm/pgalloc.h>
 27 #include <asm/sun3-head.h>
 28 #include <asm/sun3mmu.h>
 29 #include <asm/machdep.h>
 30 #include <asm/machines.h>
 31 #include <asm/idprom.h>
 32 #include <asm/intersil.h>
 33 #include <asm/irq.h>
 34 #include <asm/sections.h>
 35 #include <asm/segment.h>
 36 #include <asm/sun3ints.h>
 37 
 38 char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
 39 
 40 extern u32 sun3_gettimeoffset(void);
 41 static void sun3_sched_init(irq_handler_t handler);
 42 extern void sun3_get_model (char* model);
 43 extern int sun3_hwclk(int set, struct rtc_time *t);
 44 
 45 volatile char* clock_va;
 46 extern unsigned long availmem;
 47 unsigned long num_pages;
 48 
 49 static void sun3_get_hardware_list(struct seq_file *m)
 50 {
 51         seq_printf(m, "PROM Revision:\t%s\n", romvec->pv_monid);
 52 }
 53 
 54 void __init sun3_init(void)
 55 {
 56         unsigned char enable_register;
 57         int i;
 58 
 59         m68k_machtype= MACH_SUN3;
 60         m68k_cputype = CPU_68020;
 61         m68k_fputype = FPU_68881; /* mc68881 actually */
 62         m68k_mmutype = MMU_SUN3;
 63         clock_va    =          (char *) 0xfe06000;      /* dark  */
 64         sun3_intreg = (unsigned char *) 0xfe0a000;      /* magic */
 65         sun3_disable_interrupts();
 66 
 67         prom_init((void *)LINUX_OPPROM_BEGVM);
 68 
 69         GET_CONTROL_BYTE(AC_SENABLE,enable_register);
 70         enable_register |= 0x50; /* Enable FPU */
 71         SET_CONTROL_BYTE(AC_SENABLE,enable_register);
 72         GET_CONTROL_BYTE(AC_SENABLE,enable_register);
 73 
 74         /* This code looks suspicious, because it doesn't subtract
 75            memory belonging to the kernel from the available space */
 76 
 77 
 78         memset(sun3_reserved_pmeg, 0, sizeof(sun3_reserved_pmeg));
 79 
 80         /* Reserve important PMEGS */
 81         /* FIXME: These should be probed instead of hardcoded */
 82 
 83         for (i=0; i<8; i++)             /* Kernel PMEGs */
 84                 sun3_reserved_pmeg[i] = 1;
 85 
 86         sun3_reserved_pmeg[247] = 1;    /* ROM mapping  */
 87         sun3_reserved_pmeg[248] = 1;    /* AMD Ethernet */
 88         sun3_reserved_pmeg[251] = 1;    /* VB area      */
 89         sun3_reserved_pmeg[254] = 1;    /* main I/O     */
 90 
 91         sun3_reserved_pmeg[249] = 1;
 92         sun3_reserved_pmeg[252] = 1;
 93         sun3_reserved_pmeg[253] = 1;
 94         set_fs(KERNEL_DS);
 95 }
 96 
 97 /* Without this, Bad Things happen when something calls arch_reset. */
 98 static void sun3_reboot (void)
 99 {
100         prom_reboot ("vmlinux");
101 }
102 
103 static void sun3_halt (void)
104 {
105         prom_halt ();
106 }
107 
108 /* sun3 bootmem allocation */
109 
110 static void __init sun3_bootmem_alloc(unsigned long memory_start,
111                                       unsigned long memory_end)
112 {
113         unsigned long start_page;
114 
115         /* align start/end to page boundaries */
116         memory_start = ((memory_start + (PAGE_SIZE-1)) & PAGE_MASK);
117         memory_end = memory_end & PAGE_MASK;
118 
119         start_page = __pa(memory_start) >> PAGE_SHIFT;
120         max_pfn = num_pages = __pa(memory_end) >> PAGE_SHIFT;
121 
122         high_memory = (void *)memory_end;
123         availmem = memory_start;
124 
125         m68k_setup_node(0);
126         availmem += init_bootmem(start_page, num_pages);
127         availmem = (availmem + (PAGE_SIZE-1)) & PAGE_MASK;
128 
129         free_bootmem(__pa(availmem), memory_end - (availmem));
130 }
131 
132 
133 void __init config_sun3(void)
134 {
135         unsigned long memory_start, memory_end;
136 
137         printk("ARCH: SUN3\n");
138         idprom_init();
139 
140         /* Subtract kernel memory from available memory */
141 
142         mach_sched_init      =  sun3_sched_init;
143         mach_init_IRQ        =  sun3_init_IRQ;
144         mach_reset           =  sun3_reboot;
145         arch_gettimeoffset   =  sun3_gettimeoffset;
146         mach_get_model       =  sun3_get_model;
147         mach_hwclk           =  sun3_hwclk;
148         mach_halt            =  sun3_halt;
149         mach_get_hardware_list = sun3_get_hardware_list;
150 
151         memory_start = ((((unsigned long)_end) + 0x2000) & ~0x1fff);
152 // PROM seems to want the last couple of physical pages. --m
153         memory_end   = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE;
154 
155         m68k_num_memory=1;
156         m68k_memory[0].size=*(romvec->pv_sun3mem);
157 
158         sun3_bootmem_alloc(memory_start, memory_end);
159 }
160 
161 static void __init sun3_sched_init(irq_handler_t timer_routine)
162 {
163         sun3_disable_interrupts();
164         intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_DISABLE|INTERSIL_24H_MODE);
165         intersil_clock->int_reg=INTERSIL_HZ_100_MASK;
166         intersil_clear();
167         sun3_enable_irq(5);
168         intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE);
169         sun3_enable_interrupts();
170         intersil_clear();
171 }
172 
173 #if IS_ENABLED(CONFIG_SUN3_SCSI)
174 
175 static const struct resource sun3_scsi_vme_rsrc[] __initconst = {
176         {
177                 .flags = IORESOURCE_IRQ,
178                 .start = SUN3_VEC_VMESCSI0,
179                 .end   = SUN3_VEC_VMESCSI0,
180         }, {
181                 .flags = IORESOURCE_MEM,
182                 .start = 0xff200000,
183                 .end   = 0xff200021,
184         }, {
185                 .flags = IORESOURCE_IRQ,
186                 .start = SUN3_VEC_VMESCSI1,
187                 .end   = SUN3_VEC_VMESCSI1,
188         }, {
189                 .flags = IORESOURCE_MEM,
190                 .start = 0xff204000,
191                 .end   = 0xff204021,
192         },
193 };
194 
195 /*
196  * Int: level 2 autovector
197  * IO: type 1, base 0x00140000, 5 bits phys space: A<4..0>
198  */
199 static const struct resource sun3_scsi_rsrc[] __initconst = {
200         {
201                 .flags = IORESOURCE_IRQ,
202                 .start = 2,
203                 .end   = 2,
204         }, {
205                 .flags = IORESOURCE_MEM,
206                 .start = 0x00140000,
207                 .end   = 0x0014001f,
208         },
209 };
210 
211 int __init sun3_platform_init(void)
212 {
213         switch (idprom->id_machtype) {
214         case SM_SUN3 | SM_3_160:
215         case SM_SUN3 | SM_3_260:
216                 platform_device_register_simple("sun3_scsi_vme", -1,
217                         sun3_scsi_vme_rsrc, ARRAY_SIZE(sun3_scsi_vme_rsrc));
218                 break;
219         case SM_SUN3 | SM_3_50:
220         case SM_SUN3 | SM_3_60:
221                 platform_device_register_simple("sun3_scsi", -1,
222                         sun3_scsi_rsrc, ARRAY_SIZE(sun3_scsi_rsrc));
223                 break;
224         }
225         return 0;
226 }
227 
228 arch_initcall(sun3_platform_init);
229 
230 #endif
231 

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