2 * linux/arch/m68k/coldfire/config.c
4 * Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
5 * Kurt Mahan kmahan@freescale.com
6 * Matt Waddel Matt.Waddel@freescale.com
7 * Shrek Wu b16972@freescale.com
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/string.h>
18 #include <linux/kernel.h>
19 #include <linux/console.h>
20 #include <linux/bootmem.h>
22 #include <linux/clockchips.h>
23 #include <asm/bootinfo.h>
24 #include <asm/machdep.h>
25 #include <asm/coldfire.h>
26 #include <asm/cfcache.h>
27 #include <asm/cacheflush.h>
29 #include <asm/cfmmu.h>
30 #include <asm/setup.h>
32 #include <asm/traps.h>
36 #include <asm/pgalloc.h>
38 #include <asm/mcfsim.h>
41 #include <asm/bootinfo.h>
42 #include <asm/m5485gpt.h>
44 extern int get_irq_list(struct seq_file *p, void *v);
45 extern char _text, _end;
46 extern char _etext, _edata, __init_begin, __init_end;
47 extern struct console mcfrs_console;
48 extern char m68k_command_line[CL_SIZE];
49 extern unsigned long availmem;
51 static int irq_enable[NR_IRQS];
52 unsigned long num_pages;
54 /* cf dma physical addresses */
55 unsigned long cf_dma_base;
56 unsigned long cf_dma_end;
57 unsigned long cf_dma_size;
58 EXPORT_SYMBOL(cf_dma_base);
59 EXPORT_SYMBOL(cf_dma_end);
60 EXPORT_SYMBOL(cf_dma_size);
62 /* ethernet mac addresses from uboot */
63 unsigned char uboot_enet0[6];
64 unsigned char uboot_enet1[6];
66 void coldfire_sort_memrec(void)
70 /* Sort the m68k_memory records by address */
71 for (i = 0; i < m68k_num_memory; ++i) {
72 for (j = i + 1; j < m68k_num_memory; ++j) {
73 if (m68k_memory[i].addr > m68k_memory[j].addr) {
76 m68k_memory[i] = m68k_memory[j];
81 /* Trim off discontiguous bits */
82 for (i = 1; i < m68k_num_memory; ++i) {
83 if ((m68k_memory[i-1].addr + m68k_memory[i-1].size) !=
84 m68k_memory[i].addr) {
85 printk(KERN_DEBUG "m68k_parse_bootinfo: "
86 "addr gap between 0x%lx & 0x%lx\n",
87 m68k_memory[i-1].addr+m68k_memory[i-1].size,
98 int __init uboot_commandline(char *bootargs)
100 int len = 0, cmd_line_len;
101 static struct uboot_record uboot_info;
102 u32 offset = PAGE_OFFSET_RAW - PHYS_OFFSET;
104 extern unsigned long uboot_info_stk;
106 /* validate address */
107 if ((uboot_info_stk < PAGE_OFFSET_RAW) ||
108 (uboot_info_stk >= (PAGE_OFFSET_RAW + CONFIG_SDRAM_SIZE)))
111 /* Add offset to get post-remapped kernel memory location */
112 uboot_info.bdi = (struct bd_info *)((*(u32 *)(uboot_info_stk))
114 uboot_info.initrd_start = (*(u32 *)(uboot_info_stk+4)) + offset;
115 uboot_info.initrd_end = (*(u32 *)(uboot_info_stk+8)) + offset;
116 uboot_info.cmd_line_start = (*(u32 *)(uboot_info_stk+12)) + offset;
117 uboot_info.cmd_line_stop = (*(u32 *)(uboot_info_stk+16)) + offset;
119 /* copy over mac addresses */
120 memcpy(uboot_enet0, uboot_info.bdi->bi_enet0addr, 6);
121 memcpy(uboot_enet1, uboot_info.bdi->bi_enet1addr, 6);
123 /* copy command line */
124 cmd_line_len = uboot_info.cmd_line_stop - uboot_info.cmd_line_start;
125 if ((cmd_line_len > 0) && (cmd_line_len < CL_SIZE-1))
126 len = (int)strncpy(bootargs, (char *)uboot_info.cmd_line_start,\
133 * This routine does things not done in the bootloader.
135 #define DEFAULT_COMMAND_LINE \
136 "debug root=/dev/nfs rw \
137 nfsroot=172.27.155.1:/tftpboot/rigo/rootfs/ \
138 ip=172.27.155.75:172.27.155.1"
140 asmlinkage void __init cf_early_init(void)
142 struct bi_record *record = (struct bi_record *) &_end;
146 SET_VBR((void *)MCF_RAMBAR0);
148 /* Mask all interrupts */
149 MCF_IMRL = 0xFFFFFFFF;
150 MCF_IMRH = 0xFFFFFFFF;
152 m68k_machtype = MACH_CFMMU;
153 m68k_fputype = FPU_CFV4E;
154 m68k_mmutype = MMU_CFV4E;
155 m68k_cputype = CPU_CFV4E;
158 m68k_memory[m68k_num_memory].addr = CONFIG_SDRAM_BASE;
159 m68k_memory[m68k_num_memory++].size = CONFIG_SDRAM_SIZE;
161 if (!uboot_commandline(m68k_command_line)) {
162 #if defined(CONFIG_BOOTPARAM)
163 strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE-1);
165 strcpy(m68k_command_line, DEFAULT_COMMAND_LINE);
169 #if defined(CONFIG_BLK_DEV_INITRD)
170 /* add initrd image */
171 record = (struct bi_record *) ((void *)record + record->size);
172 record->tag = BI_RAMDISK;
173 record->size = sizeof(record->tag) + sizeof(record->size)
174 + sizeof(record->data[0]) + sizeof(record->data[1]);
177 /* Mark end of tags. */
178 record = (struct bi_record *) ((void *) record + record->size);
182 record->size = sizeof(record->tag) + sizeof(record->size)
183 + sizeof(record->data[0]) + sizeof(record->data[1]);
185 /* Invalidate caches via CACR */
187 cacr_set(CACHE_DISABLE_MODE);
189 /* Turn on caches via CACR, enable EUSP */
190 cacr_set(CACHE_INITIAL_MODE);
194 /* Assembler routines */
195 asmlinkage void buserr(void);
196 asmlinkage void trap(void);
197 asmlinkage void system_call(void);
198 asmlinkage void inthandler(void);
200 void __init coldfire_trap_init(void)
205 vectors = (e_vector *)MCF_RAMBAR0;
207 * There is a common trap handler and common interrupt
208 * handler that handle almost every vector. We treat
209 * the system call and bus error special, they get their
210 * own first level handlers.
212 for (i = 3; (i <= 23); i++)
214 for (i = 33; (i <= 63); i++)
216 for (i = 24; (i <= 31); i++)
217 vectors[i] = inthandler;
218 for (i = 64; (i < 255); i++)
219 vectors[i] = inthandler;
223 vectors[32] = system_call;
226 #ifndef CONFIG_GENERIC_CLOCKEVENTS
227 void coldfire_tick(void)
229 /* Reset the ColdFire timer */
230 MCF_SSR(0) = MCF_SSR_ST;
233 void __init coldfire_sched_init(irq_handler_t handler)
235 int irq = ISC_SLTn(0);
238 MCF_ICR(irq) = ILP_SLT0;
239 request_irq(64 + irq, handler, IRQF_DISABLED, "ColdFire Timer 0", NULL);
240 MCF_SLTCNT(0) = MCF_BUSCLK / HZ;
241 MCF_SCR(0) |= MCF_SCR_TEN | MCF_SCR_IEN | MCF_SCR_RUN;
244 unsigned long coldfire_gettimeoffset(void)
246 volatile unsigned long trr, tcn, offset;
250 offset = (trr - tcn) * ((1000000 >> 3) / HZ) / (trr >> 3);
251 if (MCF_SSR(0) & MCF_SSR_ST)
252 offset += 1000000 / HZ;
257 static unsigned long long sched_dtim_clk_val;
259 unsigned long long sched_clock(void)
262 unsigned long long cycles;
263 volatile unsigned long trr, tcn, offset;
265 local_irq_save(flags);
268 offset = (trr - tcn);
269 cycles = sched_dtim_clk_val;
270 local_irq_restore(flags);
272 return cycles + offset;
275 unsigned long long sys_dtim2_read(void)
278 unsigned long long cycles;
279 volatile unsigned long trr, tcn, offset;
281 local_irq_save(flags);
284 offset = (trr - tcn);
285 cycles = sched_dtim_clk_val;
286 local_irq_restore(flags);
288 return cycles + offset;
291 static irqreturn_t coldfire_dtim_clk_irq(int irq, void *dev)
293 struct clock_event_device *evt =
294 (struct clock_event_device *)dev;
296 MCF_SSR(0) = MCF_SSR_ST;
297 sched_dtim_clk_val += (MCF_BUSCLK) / HZ;;
298 evt->event_handler(evt);
302 void sys_dtim2_init(struct clock_event_device *evt)
304 int irq = ISC_SLTn(0);
306 sched_dtim_clk_val = 0;
308 MCF_ICR(irq) = ILP_SLT0;
309 request_irq(64 + irq, coldfire_dtim_clk_irq, IRQF_DISABLED,
310 "ColdFire Timer 0", (void *)evt);
311 MCF_SLTCNT(0) = MCF_BUSCLK / HZ;
312 MCF_SCR(0) |= MCF_SCR_TEN | MCF_SCR_IEN | MCF_SCR_RUN;
316 void coldfire_reboot(void)
318 /* disable interrupts and enable the watchdog */
319 printk(KERN_INFO "Rebooting\n");
320 asm("movew #0x2700, %sr\n");
321 MCF_GPT_GMS0 = MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS(4);
324 static void coldfire_get_model(char *model)
326 sprintf(model, "Version 4 ColdFire");
330 coldfire_bootmem_alloc(unsigned long memory_start, unsigned long memory_end)
332 unsigned long base_pfn;
334 /* compute total pages in system */
335 num_pages = PAGE_ALIGN(memory_end - PAGE_OFFSET) >> PAGE_SHIFT;
337 /* align start/end to page boundries */
338 memory_start = PAGE_ALIGN(memory_start);
339 memory_end = memory_end & PAGE_MASK;
342 base_pfn = __pa(PAGE_OFFSET) >> PAGE_SHIFT;
343 min_low_pfn = __pa(memory_start) >> PAGE_SHIFT;
344 max_low_pfn = __pa(memory_end) >> PAGE_SHIFT;
346 high_memory = (void *)memory_end;
347 availmem = memory_start;
349 /* setup bootmem data */
351 availmem += init_bootmem_node(NODE_DATA(0), min_low_pfn,
352 base_pfn, max_low_pfn);
353 availmem = PAGE_ALIGN(availmem);
355 printk(KERN_INFO "** availmem=0x%lx pa(am)=0x%lx\n",
356 availmem, __pa(availmem));
357 printk(KERN_INFO "** mstart=0x%lx mend=0x%lx\n",
358 memory_start, memory_end);
359 printk(KERN_INFO "bpfn=0x%lx minpfn=0x%lx maxpfn=0x%lx\n",
360 base_pfn, min_low_pfn, max_low_pfn);
362 /* turn over physram */
363 free_bootmem(__pa(availmem), memory_end - (availmem));
365 /* configure physical dma area */
366 cf_dma_base = __pa(PAGE_ALIGN(memory_start));
367 cf_dma_size = CONFIG_DMA_SIZE;
368 cf_dma_end = CONFIG_SDRAM_BASE + cf_dma_size - 1;
370 printk(KERN_INFO "dma: phys base=0x%lx phys end=0x%lx virt base=0x%x\n",
371 cf_dma_base, cf_dma_end, CONFIG_DMA_BASE);
373 printk(KERN_INFO "mdma=0x%x pa(mdma)=0x%lx\n",
374 MAX_DMA_ADDRESS, __pa(MAX_DMA_ADDRESS));
377 void __init config_coldfire(void)
379 unsigned long endmem, startmem;
383 * Calculate endmem from m68k_memory, assume all are contiguous
385 startmem = ((((int) &_end) + (PAGE_SIZE - 1)) & PAGE_MASK);
386 endmem = PAGE_OFFSET;
387 for (i = 0; i < m68k_num_memory; ++i)
388 endmem += m68k_memory[i].size;
390 printk(KERN_INFO "starting up linux startmem 0x%lx, endmem 0x%lx, \
391 size %luMB\n", startmem, endmem, (endmem - startmem) >> 20);
393 memset(irq_enable, 0, sizeof(irq_enable));
396 * Setup coldfire mach-specific handlers
398 mach_max_dma_address = 0xffffffff;
399 #ifndef CONFIG_GENERIC_CLOCKEVENTS
400 mach_sched_init = coldfire_sched_init;
401 mach_tick = coldfire_tick;
402 mach_gettimeoffset = coldfire_gettimeoffset;
404 mach_reset = coldfire_reboot;
405 /* mach_hwclk = coldfire_hwclk; to be done */
406 mach_get_model = coldfire_get_model;
408 coldfire_bootmem_alloc(startmem, endmem-1);
413 /* #ifdef CONFIG_BLK_DEV_INITRD
414 if (m68k_ramdisk.size) {
415 reserve_bootmem (__pa(m68k_ramdisk.addr), m68k_ramdisk.size);
416 initrd_start = (unsigned long) m68k_ramdisk.addr;
417 initrd_end = initrd_start + m68k_ramdisk.size;
418 printk (KERN_DEBUG "initrd: %08lx - %08lx\n", initrd_start,
423 #if defined(CONFIG_DUMMY_CONSOLE) || defined(CONFIG_FRAMEBUFFER_CONSOLE)
424 conswitchp = &dummy_con;
427 #if defined(CONFIG_SERIAL_COLDFIRE)
429 * This causes trouble when it is re-registered later.
430 * Currently this is fixed by conditionally commenting
431 * out the register_console in mcf_serial.c
433 register_console(&mcfrs_console);