summaryrefslogtreecommitdiffstats
path: root/arch/ppc/platforms/prpmc750.c
blob: 93bd593cf957b3d57bd41cf413d0e5e66b796796 (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
/*
 * Board setup routines for Motorola PrPMC750
 *
 * Author: Matt Porter <mporter@mvista.com>
 *
 * 2001-2004 (c) MontaVista, Software, Inc.  This file is licensed under
 * the terms of the GNU General Public License version 2.  This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/reboot.h>
#include <linux/pci.h>
#include <linux/kdev_t.h>
#include <linux/types.h>
#include <linux/major.h>
#include <linux/initrd.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/slab.h>
#include <linux/serial_reg.h>

#include <asm/byteorder.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/machdep.h>
#include <asm/pci-bridge.h>
#include <asm/uaccess.h>
#include <asm/time.h>
#include <asm/open_pic.h>
#include <asm/bootinfo.h>
#include <asm/hawk.h>

#include "prpmc750.h"

extern unsigned long loops_per_jiffy;

extern void gen550_progress(char *, unsigned short);

static u_char prpmc750_openpic_initsenses[] __initdata =
{
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_HOSTINT0 */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_UART */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_DEBUGINT */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_HAWK_WDT */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_UNUSED */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_ABORT */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_HOSTINT1 */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_HOSTINT2 */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_HOSTINT3 */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_PMC_INTA */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_PMC_INTB */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_PMC_INTC */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_PMC_INTD */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_UNUSED */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_UNUSED */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* PRPMC750_INT_UNUSED */
};

/*
 * Motorola PrPMC750/PrPMC800 in PrPMCBASE or PrPMC-Carrier
 * Combined irq tables.  Only Base has IDSEL 14, only Carrier has 21 and 22.
 */
static inline int
prpmc_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
{
	static char pci_irq_table[][4] =
	/*
	 *      PCI IDSEL/INTPIN->INTLINE
	 *      A       B       C       D
	 */
	{
		{12,	0,	0,	0},  /* IDSEL 14 - Ethernet, base */
		{0,	0,	0,	0},  /* IDSEL 15 - unused */
		{10,	11,	12,	9},  /* IDSEL 16 - PMC A1, PMC1 */
		{10,	11,	12,	9},  /* IDSEL 17 - PrPMC-A-B, PMC2-B */
		{11,	12,	9,	10}, /* IDSEL 18 - PMC A1-B, PMC1-B */
		{0,	0,	0,	0},  /* IDSEL 19 - unused */
		{9,	10,	11,	12}, /* IDSEL 20 - P2P Bridge */
		{11,	12,	9,	10}, /* IDSEL 21 - PMC A2, carrier */
		{12,	9,	10,	11}, /* IDSEL 22 - PMC A2-B, carrier */
	};
	const long min_idsel = 14, max_idsel = 22, irqs_per_slot = 4;
	return PCI_IRQ_TABLE_LOOKUP;
};

static void __init prpmc750_pcibios_fixup(void)
{
	struct pci_dev *dev;
	unsigned short wtmp;

	/*
	 * Kludge to clean up after PPC6BUG which doesn't
	 * configure the CL5446 VGA card.  Also the
	 * resource subsystem doesn't fixup the
	 * PCI mem resources on the CL5446.
	 */
	if ((dev = pci_get_device(PCI_VENDOR_ID_CIRRUS,
				   PCI_DEVICE_ID_CIRRUS_5446, 0))) {
		dev->resource[0].start += PRPMC750_PCI_PHY_MEM_OFFSET;
		dev->resource[0].end += PRPMC750_PCI_PHY_MEM_OFFSET;
		pci_read_config_word(dev, PCI_COMMAND, &wtmp);
		pci_write_config_word(dev, PCI_COMMAND, wtmp | 3);
		/* Enable Color mode in MISC reg */
		outb(0x03, 0x3c2);
		/* Select DRAM config reg */
		outb(0x0f, 0x3c4);
		/* Set proper DRAM config */
		outb(0xdf, 0x3c5);
		pci_dev_put(dev);
	}
}

void __init prpmc750_find_bridges(void)
{
	struct pci_controller *hose;

	hose = pcibios_alloc_controller();
	if (!hose)
		return;

	hose->first_busno = 0;
	hose->last_busno = 0xff;
	hose->io_base_virt = (void *)PRPMC750_ISA_IO_BASE;
	hose->pci_mem_offset = PRPMC750_PCI_PHY_MEM_OFFSET;

	pci_init_resource(&hose->io_resource,
			  PRPMC750_PCI_IO_START,
			  PRPMC750_PCI_IO_END,
			  IORESOURCE_IO, "PCI host bridge");

	pci_init_resource(&hose->mem_resources[0],
			  PRPMC750_PROC_PCI_MEM_START,
			  PRPMC750_PROC_PCI_MEM_END,
			  IORESOURCE_MEM, "PCI host bridge");

	hose->io_space.start = PRPMC750_PCI_IO_START;
	hose->io_space.end = PRPMC750_PCI_IO_END;
	hose->mem_space.start = PRPMC750_PCI_MEM_START;
	hose->mem_space.end = PRPMC750_PCI_MEM_END - HAWK_MPIC_SIZE;

	if (hawk_init(hose, PRPMC750_HAWK_PPC_REG_BASE,
		      PRPMC750_PROC_PCI_MEM_START,
		      PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE,
		      PRPMC750_PROC_PCI_IO_START, PRPMC750_PROC_PCI_IO_END,
		      PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE + 1)
	    != 0) {
		printk(KERN_CRIT "Could not initialize host bridge\n");
	}

	hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);

	ppc_md.pcibios_fixup = prpmc750_pcibios_fixup;
	ppc_md.pci_swizzle = common_swizzle;
	ppc_md.pci_map_irq = prpmc_map_irq;
}
static int prpmc750_show_cpuinfo(struct seq_file *m)
{
	seq_printf(m, "machine\t\t: PrPMC750\n");

	return 0;
}

static void __init prpmc750_setup_arch(void)
{
	/* init to some ~sane value until calibrate_delay() runs */
	loops_per_jiffy = 50000000 / HZ;

	/* Lookup PCI host bridges */
	prpmc750_find_bridges();

#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_start)
		ROOT_DEV = Root_RAM0;
	else
#endif
#ifdef CONFIG_ROOT_NFS
		ROOT_DEV = Root_NFS;
#else
		ROOT_DEV = Root_SDA2;
#endif

	OpenPIC_InitSenses = prpmc750_openpic_initsenses;
	OpenPIC_NumInitSenses = sizeof(prpmc750_openpic_initsenses);

	printk(KERN_INFO "Port by MontaVista Software, Inc. "
			"(source@mvista.com)\n");
}

/*
 * Compute the PrPMC750's bus speed using the baud clock as a
 * reference.
 */
static unsigned long __init prpmc750_get_bus_speed(void)
{
	unsigned long tbl_start, tbl_end;
	unsigned long current_state, old_state, bus_speed;
	unsigned char lcr, dll, dlm;
	int baud_divisor, count;

	/* Read the UART's baud clock divisor */
	lcr = readb(PRPMC750_SERIAL_0_LCR);
	writeb(lcr | UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
	dll = readb(PRPMC750_SERIAL_0_DLL);
	dlm = readb(PRPMC750_SERIAL_0_DLM);
	writeb(lcr & ~UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
	baud_divisor = (dlm << 8) | dll;

	/*
	 * Use the baud clock divisor and base baud clock
	 * to determine the baud rate and use that as
	 * the number of baud clock edges we use for
	 * the time base sample.  Make it half the baud
	 * rate.
	 */
	count = PRPMC750_BASE_BAUD / (baud_divisor * 16);

	/* Find the first edge of the baud clock */
	old_state = readb(PRPMC750_STATUS_REG) & PRPMC750_BAUDOUT_MASK;
	do {
		current_state = readb(PRPMC750_STATUS_REG) &
		    PRPMC750_BAUDOUT_MASK;
	} while (old_state == current_state);

	old_state = current_state;

	/* Get the starting time base value */
	tbl_start = get_tbl();

	/*
	 * Loop until we have found a number of edges equal
	 * to half the count (half the baud rate)
	 */
	do {
		do {
			current_state = readb(PRPMC750_STATUS_REG) &
			    PRPMC750_BAUDOUT_MASK;
		} while (old_state == current_state);
		old_state = current_state;
	} while (--count);

	/* Get the ending time base value */
	tbl_end = get_tbl();

	/* Compute bus speed */
	bus_speed = (tbl_end - tbl_start) * 128;

	return bus_speed;
}

static void __init prpmc750_calibrate_decr(void)
{
	unsigned long freq;
	int divisor = 4;

	freq = prpmc750_get_bus_speed();

	tb_ticks_per_jiffy = freq / (HZ * divisor);
	tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
}

static void prpmc750_restart(char *cmd)
{
	local_irq_disable();
	writeb(PRPMC750_MODRST_MASK, PRPMC750_MODRST_REG);
	while (1) ;
}

static void prpmc750_halt(void)
{
	local_irq_disable();
	while (1) ;
}

static void prpmc750_power_off(void)
{
	prpmc750_halt();
}

static void __init prpmc750_init_IRQ(void)
{
	openpic_init(0);
}

/*
 * Set BAT 3 to map 0xf0000000 to end of physical memory space.
 */
static __inline__ void prpmc750_set_bat(void)
{
	mb();
	mtspr(SPRN_DBAT1U, 0xf0001ffe);
	mtspr(SPRN_DBAT1L, 0xf000002a);
	mb();
}

/*
 * We need to read the Falcon/Hawk memory controller
 * to properly determine this value
 */
static unsigned long __init prpmc750_find_end_of_memory(void)
{
	/* Read the memory size from the Hawk SMC */
	return hawk_get_mem_size(PRPMC750_HAWK_SMC_BASE);
}

static void __init prpmc750_map_io(void)
{
	io_block_mapping(PRPMC750_ISA_IO_BASE, PRPMC750_ISA_IO_BASE,
			 0x10000000, _PAGE_IO);
#if 0
	io_block_mapping(0xf0000000, 0xc0000000, 0x08000000, _PAGE_IO);
#endif
	io_block_mapping(0xf8000000, 0xf8000000, 0x08000000, _PAGE_IO);
}

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

	/* Cover the Hawk registers with a BAT */
	prpmc750_set_bat();

	isa_io_base = PRPMC750_ISA_IO_BASE;
	isa_mem_base = PRPMC750_ISA_MEM_BASE;
	pci_dram_offset = PRPMC750_PCI_DRAM_OFFSET;

	ppc_md.setup_arch = prpmc750_setup_arch;
	ppc_md.show_cpuinfo = prpmc750_show_cpuinfo;
	ppc_md.init_IRQ = prpmc750_init_IRQ;
	ppc_md.get_irq = openpic_get_irq;

	ppc_md.find_end_of_memory = prpmc750_find_end_of_memory;
	ppc_md.setup_io_mappings = prpmc750_map_io;

	ppc_md.restart = prpmc750_restart;
	ppc_md.power_off = prpmc750_power_off;
	ppc_md.halt = prpmc750_halt;

	/* PrPMC750 has no timekeeper part */
	ppc_md.time_init = NULL;
	ppc_md.get_rtc_time = NULL;
	ppc_md.set_rtc_time = NULL;
	ppc_md.calibrate_decr = prpmc750_calibrate_decr;

#ifdef  CONFIG_SERIAL_TEXT_DEBUG
	ppc_md.progress = gen550_progress;
#endif				/* CONFIG_SERIAL_TEXT_DEBUG */
}
OpenPOWER on IntegriCloud