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Linux/arch/h8300/kernel/setup.c

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  1 /*
  2  *  linux/arch/h8300/kernel/setup.c
  3  *
  4  *  Copyleft  ()) 2000       James D. Schettine {james@telos-systems.com}
  5  *  Copyright (C) 1999,2000  Greg Ungerer (gerg@snapgear.com)
  6  *  Copyright (C) 1998,1999  D. Jeff Dionne <jeff@lineo.ca>
  7  *  Copyright (C) 1998       Kenneth Albanowski <kjahds@kjahds.com>
  8  *  Copyright (C) 1995       Hamish Macdonald
  9  *  Copyright (C) 2000       Lineo Inc. (www.lineo.com) 
 10  *  Copyright (C) 2001       Lineo, Inc. <www.lineo.com>
 11  *
 12  *  H8/300 porting Yoshinori Sato <ysato@users.sourceforge.jp>
 13  */
 14 
 15 /*
 16  * This file handles the architecture-dependent parts of system setup
 17  */
 18 
 19 #include <linux/kernel.h>
 20 #include <linux/sched.h>
 21 #include <linux/delay.h>
 22 #include <linux/interrupt.h>
 23 #include <linux/mm.h>
 24 #include <linux/fs.h>
 25 #include <linux/fb.h>
 26 #include <linux/console.h>
 27 #include <linux/genhd.h>
 28 #include <linux/errno.h>
 29 #include <linux/string.h>
 30 #include <linux/major.h>
 31 #include <linux/bootmem.h>
 32 #include <linux/seq_file.h>
 33 #include <linux/init.h>
 34 
 35 #include <asm/setup.h>
 36 #include <asm/irq.h>
 37 #include <asm/pgtable.h>
 38 #include <asm/sections.h>
 39 
 40 #if defined(__H8300H__)
 41 #define CPU "H8/300H"
 42 #include <asm/regs306x.h>
 43 #endif
 44 
 45 #if defined(__H8300S__)
 46 #define CPU "H8S"
 47 #include <asm/regs267x.h>
 48 #endif
 49 
 50 #define STUBSIZE 0xc000
 51 
 52 unsigned long rom_length;
 53 unsigned long memory_start;
 54 unsigned long memory_end;
 55 
 56 char __initdata command_line[COMMAND_LINE_SIZE];
 57 
 58 extern int _ramstart, _ramend;
 59 extern char _target_name[];
 60 extern void h8300_gpio_init(void);
 61 
 62 #if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) \
 63     && defined(CONFIG_GDB_MAGICPRINT)
 64 /* printk with gdb service */
 65 static void gdb_console_output(struct console *c, const char *msg, unsigned len)
 66 {
 67         for (; len > 0; len--) {
 68                 asm("mov.w %0,r2\n\t"
 69                     "jsr @0xc4"::"r"(*msg++):"er2");
 70         }
 71 }
 72 
 73 /*
 74  *      Setup initial baud/bits/parity. We do two things here:
 75  *      - construct a cflag setting for the first rs_open()
 76  *      - initialize the serial port
 77  *      Return non-zero if we didn't find a serial port.
 78  */
 79 static int __init gdb_console_setup(struct console *co, char *options)
 80 {
 81         return 0;
 82 }
 83 
 84 static const struct console gdb_console = {
 85         .name           = "gdb_con",
 86         .write          = gdb_console_output,
 87         .device         = NULL,
 88         .setup          = gdb_console_setup,
 89         .flags          = CON_PRINTBUFFER,
 90         .index          = -1,
 91 };
 92 #endif
 93 
 94 void __init setup_arch(char **cmdline_p)
 95 {
 96         int bootmap_size;
 97 
 98         memory_start = (unsigned long) &_ramstart;
 99 
100         /* allow for ROMFS on the end of the kernel */
101         if (memcmp((void *)memory_start, "-rom1fs-", 8) == 0) {
102 #if defined(CONFIG_BLK_DEV_INITRD)
103                 initrd_start = memory_start;
104                 initrd_end = memory_start += be32_to_cpu(((unsigned long *) (memory_start))[2]);
105 #else
106                 memory_start += be32_to_cpu(((unsigned long *) memory_start)[2]);
107 #endif
108         }
109         memory_start = PAGE_ALIGN(memory_start);
110 #if !defined(CONFIG_BLKDEV_RESERVE)
111         memory_end = (unsigned long) &_ramend; /* by now the stack is part of the init task */
112 #if defined(CONFIG_GDB_DEBUG)
113         memory_end -= STUBSIZE;
114 #endif
115 #else
116         if ((memory_end < CONFIG_BLKDEV_RESERVE_ADDRESS) && 
117             (memory_end > CONFIG_BLKDEV_RESERVE_ADDRESS))
118             /* overlap userarea */
119             memory_end = CONFIG_BLKDEV_RESERVE_ADDRESS; 
120 #endif
121 
122         init_mm.start_code = (unsigned long) _stext;
123         init_mm.end_code = (unsigned long) _etext;
124         init_mm.end_data = (unsigned long) _edata;
125         init_mm.brk = (unsigned long) 0; 
126 
127 #if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) && defined(CONFIG_GDB_MAGICPRINT)
128         register_console((struct console *)&gdb_console);
129 #endif
130 
131         printk(KERN_INFO "\r\n\nuClinux " CPU "\n");
132         printk(KERN_INFO "Target Hardware: %s\n",_target_name);
133         printk(KERN_INFO "Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
134         printk(KERN_INFO "H8/300 series support by Yoshinori Sato <ysato@users.sourceforge.jp>\n");
135 
136 #ifdef DEBUG
137         printk(KERN_DEBUG "KERNEL -> TEXT=0x%p-0x%p DATA=0x%p-0x%p "
138                 "BSS=0x%p-0x%p\n", _stext, _etext, _sdata, _edata, __bss_start,
139                 __bss_stop);
140         printk(KERN_DEBUG "KERNEL -> ROMFS=0x%p-0x%06lx MEM=0x%06lx-0x%06lx "
141                 "STACK=0x%06lx-0x%p\n", __bss_stop, memory_start, memory_start,
142                 memory_end, memory_end, &_ramend);
143 #endif
144 
145 #ifdef CONFIG_DEFAULT_CMDLINE
146         /* set from default command line */
147         if (*command_line == '\0')
148                 strcpy(command_line,CONFIG_KERNEL_COMMAND);
149 #endif
150         /* Keep a copy of command line */
151         *cmdline_p = &command_line[0];
152         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
153         boot_command_line[COMMAND_LINE_SIZE-1] = 0;
154 
155 #ifdef DEBUG
156         if (strlen(*cmdline_p)) 
157                 printk(KERN_DEBUG "Command line: '%s'\n", *cmdline_p);
158 #endif
159 
160         /*
161          * give all the memory to the bootmap allocator,  tell it to put the
162          * boot mem_map at the start of memory
163          */
164         bootmap_size = init_bootmem_node(
165                         NODE_DATA(0),
166                         memory_start >> PAGE_SHIFT, /* map goes here */
167                         PAGE_OFFSET >> PAGE_SHIFT,      /* 0 on coldfire */
168                         memory_end >> PAGE_SHIFT);
169         /*
170          * free the usable memory,  we have to make sure we do not free
171          * the bootmem bitmap so we then reserve it after freeing it :-)
172          */
173         free_bootmem(memory_start, memory_end - memory_start);
174         reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT);
175         /*
176          * get kmalloc into gear
177          */
178         paging_init();
179         h8300_gpio_init();
180 #if defined(CONFIG_H8300_AKI3068NET) && defined(CONFIG_IDE)
181         {
182 #define AREABIT(addr) (1 << (((addr) >> 21) & 7))
183                 /* setup BSC */
184                 volatile unsigned char *abwcr = (volatile unsigned char *)ABWCR;
185                 volatile unsigned char *cscr = (volatile unsigned char *)CSCR;
186                 *abwcr &= ~(AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT));
187                 *cscr  |= (AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT)) | 0x0f;
188         }
189 #endif
190 #ifdef DEBUG
191         printk(KERN_DEBUG "Done setup_arch\n");
192 #endif
193 }
194 
195 /*
196  *      Get CPU information for use by the procfs.
197  */
198 
199 static int show_cpuinfo(struct seq_file *m, void *v)
200 {
201     char *cpu;
202     int mode;
203     u_long clockfreq;
204 
205     cpu = CPU;
206     mode = *(volatile unsigned char *)MDCR & 0x07;
207 
208     clockfreq = CONFIG_CPU_CLOCK;
209 
210     seq_printf(m,  "CPU:\t\t%s (mode:%d)\n"
211                    "Clock:\t\t%lu.%1luMHz\n"
212                    "BogoMips:\t%lu.%02lu\n"
213                    "Calibration:\t%lu loops\n",
214                    cpu,mode,
215                    clockfreq/1000,clockfreq%1000,
216                    (loops_per_jiffy*HZ)/500000,((loops_per_jiffy*HZ)/5000)%100,
217                    (loops_per_jiffy*HZ));
218 
219     return 0;
220 }
221 
222 static void *c_start(struct seq_file *m, loff_t *pos)
223 {
224         return *pos < NR_CPUS ? ((void *) 0x12345678) : NULL;
225 }
226 
227 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
228 {
229         ++*pos;
230         return c_start(m, pos);
231 }
232 
233 static void c_stop(struct seq_file *m, void *v)
234 {
235 }
236 
237 const struct seq_operations cpuinfo_op = {
238         .start  = c_start,
239         .next   = c_next,
240         .stop   = c_stop,
241         .show   = show_cpuinfo,
242 };
243 

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