aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/embedded6xx/mpc7448_hpc2.c
blob: cb6f084844f2740800fe7a1b7dea14bc4cb9336d (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
/*
 * mpc7448_hpc2.c
 *
 * Board setup routines for the Freescale mpc7448hpc2(taiga) platform
 *
 * Author: Jacob Pan
 *	 jacob.pan@freescale.com
 * Author: Xianghua Xiao
 *       x.xiao@freescale.com
 * Maintainer: Roy Zang <tie-fei.zang@freescale.com>
 * 	Add Flat Device Tree support fot mpc7448hpc2 board
 *
 * Copyright 2004-2006 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/kdev_t.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/ide.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/serial_core.h>

#include <asm/system.h>
#include <asm/time.h>
#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/tsi108.h>
#include <asm/pci-bridge.h>
#include <asm/reg.h>
#include <mm/mmu_decl.h>
#include "mpc7448_hpc2.h"
#include <asm/tsi108_irq.h>
#include <asm/mpic.h>

#undef DEBUG
#ifdef DEBUG
#define DBG(fmt...) do { printk(fmt); } while(0)
#else
#define DBG(fmt...) do { } while(0)
#endif

#ifndef CONFIG_PCI
isa_io_base = MPC7448_HPC2_ISA_IO_BASE;
isa_mem_base = MPC7448_HPC2_ISA_MEM_BASE;
pci_dram_offset = MPC7448_HPC2_PCI_MEM_OFFSET;
#endif

extern int tsi108_setup_pci(struct device_node *dev);
extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
extern void tsi108_pci_int_init(void);
extern void tsi108_irq_cascade(unsigned int irq, struct irq_desc *desc,
			    struct pt_regs *regs);

int mpc7448_hpc2_exclude_device(u_char bus, u_char devfn)
{
	if (bus == 0 && PCI_SLOT(devfn) == 0)
		return PCIBIOS_DEVICE_NOT_FOUND;
	else
		return PCIBIOS_SUCCESSFUL;
}

/*
 * find pci slot by devfn in interrupt map of OF tree
 */
u8 find_slot_by_devfn(unsigned int *interrupt_map, unsigned int devfn)
{
	int i;
	unsigned int tmp;
	for (i = 0; i < 4; i++){
		tmp = interrupt_map[i*4*7];
		if ((tmp >> 11) == (devfn >> 3))
			return i;
	}
	return i;
}

/*
 * Scans the interrupt map for pci device
 */
void mpc7448_hpc2_fixup_irq(struct pci_dev *dev)
{
	struct pci_controller *hose;
	struct device_node *node;
	const unsigned int *interrupt;
	int busnr;
	int len;
	u8 slot;
	u8 pin;

	/* Lookup the hose */
	busnr = dev->bus->number;
	hose = pci_bus_to_hose(busnr);
	if (!hose)
		printk(KERN_ERR "No pci hose found\n");

	/* Check it has an OF node associated */
	node = (struct device_node *) hose->arch_data;
	if (!node)
		printk(KERN_ERR "No pci node found\n");

	interrupt = get_property(node, "interrupt-map", &len);
	slot = find_slot_by_devfn(interrupt, dev->devfn);
	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
	if (pin == 0 || pin > 4)
		pin = 1;
	pin--;
	dev->irq  = interrupt[slot*4*7 + pin*7 + 5];
	DBG("TSI_PCI: dev->irq = 0x%x\n", dev->irq);
}
/* temporary pci irq map fixup*/

void __init mpc7448_hpc2_pcibios_fixup(void)
{
	struct pci_dev *dev = NULL;
	for_each_pci_dev(dev) {
		mpc7448_hpc2_fixup_irq(dev);
		pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
	}
}

static void __init mpc7448_hpc2_setup_arch(void)
{
	struct device_node *cpu;
	struct device_node *np;
	if (ppc_md.progress)
		ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0);

	cpu = of_find_node_by_type(NULL, "cpu");
	if (cpu != 0) {
		const unsigned int *fp;

		fp = get_property(cpu, "clock-frequency", NULL);
		if (fp != 0)
			loops_per_jiffy = *fp / HZ;
		else
			loops_per_jiffy = 50000000 / HZ;
		of_node_put(cpu);
	}
	tsi108_csr_vir_base = get_vir_csrbase();

#ifdef	CONFIG_ROOT_NFS
	ROOT_DEV = Root_NFS;
#else
	ROOT_DEV = Root_HDA1;
#endif

#ifdef CONFIG_BLK_DEV_INITRD
	ROOT_DEV = Root_RAM0;
#endif

	/* setup PCI host bridge */
#ifdef CONFIG_PCI
	for (np = NULL; (np = of_find_node_by_type(np, "pci")) != NULL;)
		tsi108_setup_pci(np);

	ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
	if (ppc_md.progress)
		ppc_md.progress("tsi108: resources set", 0x100);
#endif

	printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
	printk(KERN_INFO
	       "Jointly ported by Freescale and Tundra Semiconductor\n");
	printk(KERN_INFO
	       "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
}

/*
 * Interrupt setup and service.  Interrrupts on the mpc7448_hpc2 come
 * from the four external INT pins, PCI interrupts are routed via
 * PCI interrupt control registers, it generates internal IRQ23
 *
 * Interrupt routing on the Taiga Board:
 * TSI108:PB_INT[0] -> CPU0:INT#
 * TSI108:PB_INT[1] -> CPU0:MCP#
 * TSI108:PB_INT[2] -> N/C
 * TSI108:PB_INT[3] -> N/C
 */
static void __init mpc7448_hpc2_init_IRQ(void)
{
	struct mpic *mpic;
	phys_addr_t mpic_paddr = 0;
	unsigned int cascade_pci_irq;
	struct device_node *tsi_pci;
	struct device_node *tsi_pic;

	tsi_pic = of_find_node_by_type(NULL, "open-pic");
	if (tsi_pic) {
		unsigned int size;
		void *prop = get_property(tsi_pic, "reg", &size);
		mpic_paddr = of_translate_address(tsi_pic, prop);
	}

	if (mpic_paddr == 0) {
		printk("%s: No tsi108 PIC found !\n", __FUNCTION__);
		return;
	}

	DBG("%s: tsi108pic phys_addr = 0x%x\n", __FUNCTION__,
	    (u32) mpic_paddr);

	mpic = mpic_alloc(tsi_pic, mpic_paddr,
			MPIC_PRIMARY | MPIC_BIG_ENDIAN | MPIC_WANTS_RESET |
			MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
			0, /* num_sources used */
			0, /* num_sources used */
			"Tsi108_PIC");

	BUG_ON(mpic == NULL); /* XXXX */
	mpic_init(mpic);

	tsi_pci = of_find_node_by_type(NULL, "pci");
	if (tsi_pci == 0) {
		printk("%s: No tsi108 pci node found !\n", __FUNCTION__);
		return;
	}

	cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
	set_irq_data(cascade_pci_irq, mpic);
	set_irq_chained_handler(cascade_pci_irq, tsi108_irq_cascade);

	tsi108_pci_int_init();

	/* Configure MPIC outputs to CPU0 */
	tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
	of_node_put(tsi_pic);
}

void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
{
	seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
	seq_printf(m, "machine\t\t: MPC7448hpc2\n");
}

void mpc7448_hpc2_restart(char *cmd)
{
	local_irq_disable();

	/* Set exception prefix high - to the firmware */
	_nmask_and_or_msr(0, MSR_IP);

	for (;;) ;		/* Spin until reset happens */
}

void mpc7448_hpc2_power_off(void)
{
	local_irq_disable();
	for (;;) ;		/* No way to shut power off with software */
}

void mpc7448_hpc2_halt(void)
{
	mpc7448_hpc2_power_off();
}

/*
 * Called very early, device-tree isn't unflattened
 */
static int __init mpc7448_hpc2_probe(void)
{
	unsigned long root = of_get_flat_dt_root();

	if (!of_flat_dt_is_compatible(root, "mpc74xx"))
		return 0;
	return 1;
}

static int mpc7448_machine_check_exception(struct pt_regs *regs)
{
	extern void tsi108_clear_pci_cfg_error(void);
	const struct exception_table_entry *entry;

	/* Are we prepared to handle this fault */
	if ((entry = search_exception_tables(regs->nip)) != NULL) {
		tsi108_clear_pci_cfg_error();
		regs->msr |= MSR_RI;
		regs->nip = entry->fixup;
		return 1;
	}
	return 0;

}

define_machine(mpc7448_hpc2){
	.name 			= "MPC7448 HPC2",
	.probe 			= mpc7448_hpc2_probe,
	.setup_arch 		= mpc7448_hpc2_setup_arch,
	.init_IRQ 		= mpc7448_hpc2_init_IRQ,
	.show_cpuinfo 		= mpc7448_hpc2_show_cpuinfo,
	.get_irq 		= mpic_get_irq,
	.pcibios_fixup 		= mpc7448_hpc2_pcibios_fixup,
	.restart 		= mpc7448_hpc2_restart,
	.calibrate_decr 	= generic_calibrate_decr,
	.machine_check_exception= mpc7448_machine_check_exception,
	.progress 		= udbg_progress,
};