summaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/85xx/mpc85xx_cds.c
blob: 13a8d1a3d55cb8f3a5369cb704d13ee2a5c99ebe (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
/*
 * MPC85xx setup and early boot code plus other random bits.
 *
 * Maintained by Kumar Gala (see MAINTAINERS for contact information)
 *
 * Copyright 2005, 2011-2012 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/init.h>
#include <linux/errno.h>
#include <linux/reboot.h>
#include <linux/pci.h>
#include <linux/kdev_t.h>
#include <linux/major.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/seq_file.h>
#include <linux/initrd.h>
#include <linux/interrupt.h>
#include <linux/fsl_devices.h>
#include <linux/of_platform.h>

#include <asm/pgtable.h>
#include <asm/page.h>
#include <linux/atomic.h>
#include <asm/time.h>
#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/ipic.h>
#include <asm/pci-bridge.h>
#include <asm/irq.h>
#include <mm/mmu_decl.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/mpic.h>
#include <asm/i8259.h>

#include <sysdev/fsl_soc.h>
#include <sysdev/fsl_pci.h>

#include "mpc85xx.h"

/*
 * The CDS board contains an FPGA/CPLD called "Cadmus", which collects
 * various logic and performs system control functions.
 * Here is the FPGA/CPLD register map.
 */
struct cadmus_reg {
	u8 cm_ver;		/* Board version */
	u8 cm_csr;		/* General control/status */
	u8 cm_rst;		/* Reset control */
	u8 cm_hsclk;	/* High speed clock */
	u8 cm_hsxclk;	/* High speed clock extended */
	u8 cm_led;		/* LED data */
	u8 cm_pci;		/* PCI control/status */
	u8 cm_dma;		/* DMA control */
	u8 res[248];	/* Total 256 bytes */
};

static struct cadmus_reg *cadmus;

#ifdef CONFIG_PCI

#define ARCADIA_HOST_BRIDGE_IDSEL	17
#define ARCADIA_2ND_BRIDGE_IDSEL	3

static int mpc85xx_exclude_device(struct pci_controller *hose,
				  u_char bus, u_char devfn)
{
	/* We explicitly do not go past the Tundra 320 Bridge */
	if ((bus == 1) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
		return PCIBIOS_DEVICE_NOT_FOUND;
	if ((bus == 0) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
		return PCIBIOS_DEVICE_NOT_FOUND;
	else
		return PCIBIOS_SUCCESSFUL;
}

static void mpc85xx_cds_restart(char *cmd)
{
	struct pci_dev *dev;
	u_char tmp;

	if ((dev = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686,
					NULL))) {

		/* Use the VIA Super Southbridge to force a PCI reset */
		pci_read_config_byte(dev, 0x47, &tmp);
		pci_write_config_byte(dev, 0x47, tmp | 1);

		/* Flush the outbound PCI write queues */
		pci_read_config_byte(dev, 0x47, &tmp);

		/*
		 *  At this point, the harware reset should have triggered.
		 *  However, if it doesn't work for some mysterious reason,
		 *  just fall through to the default reset below.
		 */

		pci_dev_put(dev);
	}

	/*
	 *  If we can't find the VIA chip (maybe the P2P bridge is disabled)
	 *  or the VIA chip reset didn't work, just use the default reset.
	 */
	fsl_rstcr_restart(NULL);
}

static void __init mpc85xx_cds_pci_irq_fixup(struct pci_dev *dev)
{
	u_char c;
	if (dev->vendor == PCI_VENDOR_ID_VIA) {
		switch (dev->device) {
		case PCI_DEVICE_ID_VIA_82C586_1:
			/*
			 * U-Boot does not set the enable bits
			 * for the IDE device. Force them on here.
			 */
			pci_read_config_byte(dev, 0x40, &c);
			c |= 0x03; /* IDE: Chip Enable Bits */
			pci_write_config_byte(dev, 0x40, c);

			/*
			 * Since only primary interface works, force the
			 * IDE function to standard primary IDE interrupt
			 * w/ 8259 offset
			 */
			dev->irq = 14;
			pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
			break;
		/*
		 * Force legacy USB interrupt routing
		 */
		case PCI_DEVICE_ID_VIA_82C586_2:
		/* There are two USB controllers.
		 * Identify them by functon number
		 */
			if (PCI_FUNC(dev->devfn) == 3)
				dev->irq = 11;
			else
				dev->irq = 10;
			pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
		default:
			break;
		}
	}
}

static void skip_fake_bridge(struct pci_dev *dev)
{
	/* Make it an error to skip the fake bridge
	 * in pci_setup_device() in probe.c */
	dev->hdr_type = 0x7f;
}
DECLARE_PCI_FIXUP_EARLY(0x1957, 0x3fff, skip_fake_bridge);
DECLARE_PCI_FIXUP_EARLY(0x3fff, 0x1957, skip_fake_bridge);
DECLARE_PCI_FIXUP_EARLY(0xff3f, 0x5719, skip_fake_bridge);

#define PCI_DEVICE_ID_IDT_TSI310	0x01a7

/*
 * Fix Tsi310 PCI-X bridge resource.
 * Force the bridge to open a window from 0x0000-0x1fff in PCI I/O space.
 * This allows legacy I/O(i8259, etc) on the VIA southbridge to be accessed.
 */
void mpc85xx_cds_fixup_bus(struct pci_bus *bus)
{
	struct pci_dev *dev = bus->self;
	struct resource *res = bus->resource[0];

	if (dev != NULL &&
	    dev->vendor == PCI_VENDOR_ID_IBM &&
	    dev->device == PCI_DEVICE_ID_IDT_TSI310) {
		if (res) {
			res->start = 0;
			res->end   = 0x1fff;
			res->flags = IORESOURCE_IO;
			pr_info("mpc85xx_cds: PCI bridge resource fixup applied\n");
			pr_info("mpc85xx_cds: %pR\n", res);
		}
	}

	fsl_pcibios_fixup_bus(bus);
}

#ifdef CONFIG_PPC_I8259
static void mpc85xx_8259_cascade_handler(unsigned int __irq,
					 struct irq_desc *desc)
{
	unsigned int irq = irq_desc_get_irq(desc);
	unsigned int cascade_irq = i8259_irq();

	if (cascade_irq != NO_IRQ)
		/* handle an interrupt from the 8259 */
		generic_handle_irq(cascade_irq);

	/* check for any interrupts from the shared IRQ line */
	handle_fasteoi_irq(irq, desc);
}

static irqreturn_t mpc85xx_8259_cascade_action(int irq, void *dev_id)
{
	return IRQ_HANDLED;
}

static struct irqaction mpc85xxcds_8259_irqaction = {
	.handler = mpc85xx_8259_cascade_action,
	.flags = IRQF_SHARED | IRQF_NO_THREAD,
	.name = "8259 cascade",
};
#endif /* PPC_I8259 */
#endif /* CONFIG_PCI */

static void __init mpc85xx_cds_pic_init(void)
{
	struct mpic *mpic;
	mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN,
			0, 256, " OpenPIC  ");
	BUG_ON(mpic == NULL);
	mpic_init(mpic);
}

#if defined(CONFIG_PPC_I8259) && defined(CONFIG_PCI)
static int mpc85xx_cds_8259_attach(void)
{
	int ret;
	struct device_node *np = NULL;
	struct device_node *cascade_node = NULL;
	int cascade_irq;

	/* Initialize the i8259 controller */
	for_each_node_by_type(np, "interrupt-controller")
		if (of_device_is_compatible(np, "chrp,iic")) {
			cascade_node = np;
			break;
		}

	if (cascade_node == NULL) {
		printk(KERN_DEBUG "Could not find i8259 PIC\n");
		return -ENODEV;
	}

	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
	if (cascade_irq == NO_IRQ) {
		printk(KERN_ERR "Failed to map cascade interrupt\n");
		return -ENXIO;
	}

	i8259_init(cascade_node, 0);
	of_node_put(cascade_node);

	/*
	 *  Hook the interrupt to make sure desc->action is never NULL.
	 *  This is required to ensure that the interrupt does not get
	 *  disabled when the last user of the shared IRQ line frees their
	 *  interrupt.
	 */
	if ((ret = setup_irq(cascade_irq, &mpc85xxcds_8259_irqaction))) {
		printk(KERN_ERR "Failed to setup cascade interrupt\n");
		return ret;
	}

	/* Success. Connect our low-level cascade handler. */
	irq_set_handler(cascade_irq, mpc85xx_8259_cascade_handler);

	return 0;
}
machine_device_initcall(mpc85xx_cds, mpc85xx_cds_8259_attach);

#endif /* CONFIG_PPC_I8259 */

static void mpc85xx_cds_pci_assign_primary(void)
{
#ifdef CONFIG_PCI
	struct device_node *np;

	if (fsl_pci_primary)
		return;

	/*
	 * MPC85xx_CDS has ISA bridge but unfortunately there is no
	 * isa node in device tree. We now looking for i8259 node as
	 * a workaround for such a broken device tree. This routine
	 * is for complying to all device trees.
	 */
	np = of_find_node_by_name(NULL, "i8259");
	while ((fsl_pci_primary = of_get_parent(np))) {
		of_node_put(np);
		np = fsl_pci_primary;

		if ((of_device_is_compatible(np, "fsl,mpc8540-pci") ||
		    of_device_is_compatible(np, "fsl,mpc8548-pcie")) &&
		    of_device_is_available(np))
			return;
	}
#endif
}

/*
 * Setup the architecture
 */
static void __init mpc85xx_cds_setup_arch(void)
{
	struct device_node *np;
	int cds_pci_slot;

	if (ppc_md.progress)
		ppc_md.progress("mpc85xx_cds_setup_arch()", 0);

	np = of_find_compatible_node(NULL, NULL, "fsl,mpc8548cds-fpga");
	if (!np) {
		pr_err("Could not find FPGA node.\n");
		return;
	}

	cadmus = of_iomap(np, 0);
	of_node_put(np);
	if (!cadmus) {
		pr_err("Fail to map FPGA area.\n");
		return;
	}

	if (ppc_md.progress) {
		char buf[40];
		cds_pci_slot = ((in_8(&cadmus->cm_csr) >> 6) & 0x3) + 1;
		snprintf(buf, 40, "CDS Version = 0x%x in slot %d\n",
				in_8(&cadmus->cm_ver), cds_pci_slot);
		ppc_md.progress(buf, 0);
	}

#ifdef CONFIG_PCI
	ppc_md.pci_irq_fixup = mpc85xx_cds_pci_irq_fixup;
	ppc_md.pci_exclude_device = mpc85xx_exclude_device;
#endif

	mpc85xx_cds_pci_assign_primary();
	fsl_pci_assign_primary();
}

static void mpc85xx_cds_show_cpuinfo(struct seq_file *m)
{
	uint pvid, svid, phid1;

	pvid = mfspr(SPRN_PVR);
	svid = mfspr(SPRN_SVR);

	seq_printf(m, "Vendor\t\t: Freescale Semiconductor\n");
	seq_printf(m, "Machine\t\t: MPC85xx CDS (0x%x)\n",
			in_8(&cadmus->cm_ver));
	seq_printf(m, "PVR\t\t: 0x%x\n", pvid);
	seq_printf(m, "SVR\t\t: 0x%x\n", svid);

	/* Display cpu Pll setting */
	phid1 = mfspr(SPRN_HID1);
	seq_printf(m, "PLL setting\t: 0x%x\n", ((phid1 >> 24) & 0x3f));
}


/*
 * Called very early, device-tree isn't unflattened
 */
static int __init mpc85xx_cds_probe(void)
{
        unsigned long root = of_get_flat_dt_root();

        return of_flat_dt_is_compatible(root, "MPC85xxCDS");
}

machine_arch_initcall(mpc85xx_cds, mpc85xx_common_publish_devices);

define_machine(mpc85xx_cds) {
	.name		= "MPC85xx CDS",
	.probe		= mpc85xx_cds_probe,
	.setup_arch	= mpc85xx_cds_setup_arch,
	.init_IRQ	= mpc85xx_cds_pic_init,
	.show_cpuinfo	= mpc85xx_cds_show_cpuinfo,
	.get_irq	= mpic_get_irq,
#ifdef CONFIG_PCI
	.restart	= mpc85xx_cds_restart,
	.pcibios_fixup_bus	= mpc85xx_cds_fixup_bus,
	.pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
#else
	.restart	= fsl_rstcr_restart,
#endif
	.calibrate_decr = generic_calibrate_decr,
	.progress	= udbg_progress,
};