summaryrefslogtreecommitdiffstats
path: root/arch/ppc/syslib/m8xx_setup.c
blob: 4c888da89b3c117c4aa709fc94a36b1165a7e150 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
/*
 *  arch/ppc/kernel/setup.c
 *
 *  Copyright (C) 1995  Linus Torvalds
 *  Adapted from 'alpha' version by Gary Thomas
 *  Modified by Cort Dougan (cort@cs.nmt.edu)
 *  Modified for MBX using prep/chrp/pmac functions by Dan (dmalek@jlc.net)
 *  Further modified for generic 8xx by Dan.
 */

/*
 * bootup setup stuff..
 */

#include <linux/config.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/tty.h>
#include <linux/major.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/initrd.h>
#include <linux/ioport.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>

#include <asm/mmu.h>
#include <asm/reg.h>
#include <asm/residual.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/mpc8xx.h>
#include <asm/8xx_immap.h>
#include <asm/machdep.h>
#include <asm/bootinfo.h>
#include <asm/time.h>
#include <asm/xmon.h>

#include "ppc8xx_pic.h"

static int m8xx_set_rtc_time(unsigned long time);
static unsigned long m8xx_get_rtc_time(void);
void m8xx_calibrate_decr(void);

unsigned char __res[sizeof(bd_t)];

extern void m8xx_ide_init(void);

extern unsigned long find_available_memory(void);
extern void m8xx_cpm_reset(void);
extern void m8xx_wdt_handler_install(bd_t *bp);
extern void rpxfb_alloc_pages(void);
extern void cpm_interrupt_init(void);

void __attribute__ ((weak))
board_init(void)
{
}

void __init
m8xx_setup_arch(void)
{
	/* Reset the Communication Processor Module.
	*/
	m8xx_cpm_reset();

#ifdef CONFIG_FB_RPX
	rpxfb_alloc_pages();
#endif

#ifdef notdef
	ROOT_DEV = Root_HDA1; /* hda1 */
#endif

#ifdef CONFIG_BLK_DEV_INITRD
#if 0
	ROOT_DEV = Root_FD0; /* floppy */
	rd_prompt = 1;
	rd_doload = 1;
	rd_image_start = 0;
#endif
#if 0	/* XXX this may need to be updated for the new bootmem stuff,
	   or possibly just deleted (see set_phys_avail() in init.c).
	   - paulus. */
	/* initrd_start and size are setup by boot/head.S and kernel/head.S */
	if ( initrd_start )
	{
		if (initrd_end > *memory_end_p)
		{
			printk("initrd extends beyond end of memory "
			       "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
			       initrd_end,*memory_end_p);
			initrd_start = 0;
		}
	}
#endif
#endif
	board_init();
}

void
abort(void)
{
#ifdef CONFIG_XMON
	xmon(0);
#endif
	machine_restart(NULL);

	/* not reached */
	for (;;);
}

/* A place holder for time base interrupts, if they are ever enabled. */
irqreturn_t timebase_interrupt(int irq, void * dev, struct pt_regs * regs)
{
	printk ("timebase_interrupt()\n");

	return IRQ_HANDLED;
}

static struct irqaction tbint_irqaction = {
	.handler = timebase_interrupt,
	.mask = CPU_MASK_NONE,
	.name = "tbint",
};

/* The decrementer counts at the system (internal) clock frequency divided by
 * sixteen, or external oscillator divided by four.  We force the processor
 * to use system clock divided by sixteen.
 */
void __init m8xx_calibrate_decr(void)
{
	bd_t	*binfo = (bd_t *)__res;
	int freq, fp, divisor;

	/* Unlock the SCCR. */
	((volatile immap_t *)IMAP_ADDR)->im_clkrstk.cark_sccrk = ~KAPWR_KEY;
	((volatile immap_t *)IMAP_ADDR)->im_clkrstk.cark_sccrk = KAPWR_KEY;

	/* Force all 8xx processors to use divide by 16 processor clock. */
	((volatile immap_t *)IMAP_ADDR)->im_clkrst.car_sccr |= 0x02000000;

	/* Processor frequency is MHz.
	 * The value 'fp' is the number of decrementer ticks per second.
	 */
	fp = binfo->bi_intfreq / 16;
	freq = fp*60;	/* try to make freq/1e6 an integer */
        divisor = 60;
        printk("Decrementer Frequency = %d/%d\n", freq, divisor);
        tb_ticks_per_jiffy = freq / HZ / divisor;
	tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);

	/* Perform some more timer/timebase initialization.  This used
	 * to be done elsewhere, but other changes caused it to get
	 * called more than once....that is a bad thing.
	 *
	 * First, unlock all of the registers we are going to modify.
	 * To protect them from corruption during power down, registers
	 * that are maintained by keep alive power are "locked".  To
	 * modify these registers we have to write the key value to
	 * the key location associated with the register.
	 * Some boards power up with these unlocked, while others
	 * are locked.  Writing anything (including the unlock code?)
	 * to the unlocked registers will lock them again.  So, here
	 * we guarantee the registers are locked, then we unlock them
	 * for our use.
	 */
	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbscrk = ~KAPWR_KEY;
	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtcsck = ~KAPWR_KEY;
	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbk    = ~KAPWR_KEY;
	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbscrk =  KAPWR_KEY;
	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtcsck =  KAPWR_KEY;
	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbk    =  KAPWR_KEY;

	/* Disable the RTC one second and alarm interrupts. */
	((volatile immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc &=
						~(RTCSC_SIE | RTCSC_ALE);
	/* Enable the RTC */
	((volatile immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc |=
						(RTCSC_RTF | RTCSC_RTE);

	/* Enabling the decrementer also enables the timebase interrupts
	 * (or from the other point of view, to get decrementer interrupts
	 * we have to enable the timebase).  The decrementer interrupt
	 * is wired into the vector table, nothing to do here for that.
	 */
	((volatile immap_t *)IMAP_ADDR)->im_sit.sit_tbscr =
				((mk_int_int_mask(DEC_INTERRUPT) << 8) |
					 (TBSCR_TBF | TBSCR_TBE));

	if (setup_irq(DEC_INTERRUPT, &tbint_irqaction))
		panic("Could not allocate timer IRQ!");

#ifdef CONFIG_8xx_WDT
	/* Install watchdog timer handler early because it might be
	 * already enabled by the bootloader
	 */
	m8xx_wdt_handler_install(binfo);
#endif
}

/* The RTC on the MPC8xx is an internal register.
 * We want to protect this during power down, so we need to unlock,
 * modify, and re-lock.
 */
static int
m8xx_set_rtc_time(unsigned long time)
{
	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtck = KAPWR_KEY;
	((volatile immap_t *)IMAP_ADDR)->im_sit.sit_rtc = time;
	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtck = ~KAPWR_KEY;
	return(0);
}

static unsigned long
m8xx_get_rtc_time(void)
{
	/* Get time from the RTC. */
	return((unsigned long)(((immap_t *)IMAP_ADDR)->im_sit.sit_rtc));
}

static void
m8xx_restart(char *cmd)
{
	__volatile__ unsigned char dummy;

	local_irq_disable();
	((immap_t *)IMAP_ADDR)->im_clkrst.car_plprcr |= 0x00000080;

	/* Clear the ME bit in MSR to cause checkstop on machine check
	*/
	mtmsr(mfmsr() & ~0x1000);

	dummy = ((immap_t *)IMAP_ADDR)->im_clkrst.res[0];
	printk("Restart failed\n");
	while(1);
}

static void
m8xx_power_off(void)
{
   m8xx_restart(NULL);
}

static void
m8xx_halt(void)
{
   m8xx_restart(NULL);
}


static int
m8xx_show_percpuinfo(struct seq_file *m, int i)
{
	bd_t	*bp;

	bp = (bd_t *)__res;

	seq_printf(m, "clock\t\t: %uMHz\n"
		   "bus clock\t: %uMHz\n",
		   bp->bi_intfreq / 1000000,
		   bp->bi_busfreq / 1000000);

	return 0;
}

#ifdef CONFIG_PCI
static struct irqaction mbx_i8259_irqaction = {
	.handler = mbx_i8259_action,
	.mask = CPU_MASK_NONE,
	.name = "i8259 cascade",
};
#endif

/* Initialize the internal interrupt controller.  The number of
 * interrupts supported can vary with the processor type, and the
 * 82xx family can have up to 64.
 * External interrupts can be either edge or level triggered, and
 * need to be initialized by the appropriate driver.
 */
static void __init
m8xx_init_IRQ(void)
{
	int i;

	for (i = SIU_IRQ_OFFSET ; i < SIU_IRQ_OFFSET + NR_SIU_INTS ; i++)
		irq_desc[i].handler = &ppc8xx_pic;

	cpm_interrupt_init();

#if defined(CONFIG_PCI)
	for (i = I8259_IRQ_OFFSET ; i < I8259_IRQ_OFFSET + NR_8259_INTS ; i++)
		irq_desc[i].handler = &i8259_pic;

	i8259_pic_irq_offset = I8259_IRQ_OFFSET;
	i8259_init(0);

	/* The i8259 cascade interrupt must be level sensitive. */
	((immap_t *)IMAP_ADDR)->im_siu_conf.sc_siel &=
		~(0x80000000 >> ISA_BRIDGE_INT);

	if (setup_irq(ISA_BRIDGE_INT, &mbx_i8259_irqaction))
		enable_irq(ISA_BRIDGE_INT);
#endif	/* CONFIG_PCI */
}

/* -------------------------------------------------------------------- */

/*
 * This is a big hack right now, but it may turn into something real
 * someday.
 *
 * For the 8xx boards (at this time anyway), there is nothing to initialize
 * associated the PROM.  Rather than include all of the prom.c
 * functions in the image just to get prom_init, all we really need right
 * now is the initialization of the physical memory region.
 */
static unsigned long __init
m8xx_find_end_of_memory(void)
{
	bd_t	*binfo;
	extern unsigned char __res[];

	binfo = (bd_t *)__res;

	return binfo->bi_memsize;
}

/*
 * Now map in some of the I/O space that is generically needed
 * or shared with multiple devices.
 * All of this fits into the same 4Mbyte region, so it only
 * requires one page table page.  (or at least it used to  -- paulus)
 */
static void __init
m8xx_map_io(void)
{
        io_block_mapping(IMAP_ADDR, IMAP_ADDR, IMAP_SIZE, _PAGE_IO);
#ifdef CONFIG_MBX
        io_block_mapping(NVRAM_ADDR, NVRAM_ADDR, NVRAM_SIZE, _PAGE_IO);
        io_block_mapping(MBX_CSR_ADDR, MBX_CSR_ADDR, MBX_CSR_SIZE, _PAGE_IO);
        io_block_mapping(PCI_CSR_ADDR, PCI_CSR_ADDR, PCI_CSR_SIZE, _PAGE_IO);

	/* Map some of the PCI/ISA I/O space to get the IDE interface.
	*/
        io_block_mapping(PCI_ISA_IO_ADDR, PCI_ISA_IO_ADDR, 0x4000, _PAGE_IO);
        io_block_mapping(PCI_IDE_ADDR, PCI_IDE_ADDR, 0x4000, _PAGE_IO);
#endif
#if defined(CONFIG_RPXLITE) || defined(CONFIG_RPXCLASSIC)
	io_block_mapping(RPX_CSR_ADDR, RPX_CSR_ADDR, RPX_CSR_SIZE, _PAGE_IO);
#if !defined(CONFIG_PCI)
	io_block_mapping(_IO_BASE,_IO_BASE,_IO_BASE_SIZE, _PAGE_IO);
#endif
#endif
#if defined(CONFIG_HTDMSOUND) || defined(CONFIG_RPXTOUCH) || defined(CONFIG_FB_RPX)
	io_block_mapping(HIOX_CSR_ADDR, HIOX_CSR_ADDR, HIOX_CSR_SIZE, _PAGE_IO);
#endif
#ifdef CONFIG_FADS
	io_block_mapping(BCSR_ADDR, BCSR_ADDR, BCSR_SIZE, _PAGE_IO);
#endif
#ifdef CONFIG_PCI
        io_block_mapping(PCI_CSR_ADDR, PCI_CSR_ADDR, PCI_CSR_SIZE, _PAGE_IO);
#endif
#if defined(CONFIG_NETTA)
	io_block_mapping(_IO_BASE,_IO_BASE,_IO_BASE_SIZE, _PAGE_IO);
#endif
}

void __init
platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
		unsigned long r6, unsigned long r7)
{
	parse_bootinfo(find_bootinfo());

	if ( r3 )
		memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );

#ifdef CONFIG_PCI
	m8xx_setup_pci_ptrs();
#endif

#ifdef CONFIG_BLK_DEV_INITRD
	/* take care of initrd if we have one */
	if ( r4 )
	{
		initrd_start = r4 + KERNELBASE;
		initrd_end = r5 + KERNELBASE;
	}
#endif /* CONFIG_BLK_DEV_INITRD */
	/* take care of cmd line */
	if ( r6 )
	{
		*(char *)(r7+KERNELBASE) = 0;
		strcpy(cmd_line, (char *)(r6+KERNELBASE));
	}

	ppc_md.setup_arch		= m8xx_setup_arch;
	ppc_md.show_percpuinfo		= m8xx_show_percpuinfo;
	ppc_md.irq_canonicalize	= NULL;
	ppc_md.init_IRQ			= m8xx_init_IRQ;
	ppc_md.get_irq			= m8xx_get_irq;
	ppc_md.init			= NULL;

	ppc_md.restart			= m8xx_restart;
	ppc_md.power_off		= m8xx_power_off;
	ppc_md.halt			= m8xx_halt;

	ppc_md.time_init		= NULL;
	ppc_md.set_rtc_time		= m8xx_set_rtc_time;
	ppc_md.get_rtc_time		= m8xx_get_rtc_time;
	ppc_md.calibrate_decr		= m8xx_calibrate_decr;

	ppc_md.find_end_of_memory	= m8xx_find_end_of_memory;
	ppc_md.setup_io_mappings	= m8xx_map_io;

#if defined(CONFIG_BLK_DEV_MPC8xx_IDE)
	m8xx_ide_init();
#endif
}