summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/chrp/pci.c
blob: ac224876ce5943f999a0def0007f7214cd35ff9a (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
/*
 * CHRP pci routines.
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/ide.h>

#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/hydra.h>
#include <asm/prom.h>
#include <asm/gg2.h>
#include <asm/machdep.h>
#include <asm/sections.h>
#include <asm/pci-bridge.h>
#include <asm/open_pic.h>
#include <asm/grackle.h>
#include <asm/rtas.h>

#include "chrp.h"

/* LongTrail */
void __iomem *gg2_pci_config_base;

/*
 * The VLSI Golden Gate II has only 512K of PCI configuration space, so we
 * limit the bus number to 3 bits
 */

int gg2_read_config(struct pci_bus *bus, unsigned int devfn, int off,
			   int len, u32 *val)
{
	volatile void __iomem *cfg_data;
	struct pci_controller *hose = bus->sysdata;

	if (bus->number > 7)
		return PCIBIOS_DEVICE_NOT_FOUND;
	/*
	 * Note: the caller has already checked that off is
	 * suitably aligned and that len is 1, 2 or 4.
	 */
	cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
	switch (len) {
	case 1:
		*val =  in_8(cfg_data);
		break;
	case 2:
		*val = in_le16(cfg_data);
		break;
	default:
		*val = in_le32(cfg_data);
		break;
	}
	return PCIBIOS_SUCCESSFUL;
}

int gg2_write_config(struct pci_bus *bus, unsigned int devfn, int off,
			    int len, u32 val)
{
	volatile void __iomem *cfg_data;
	struct pci_controller *hose = bus->sysdata;

	if (bus->number > 7)
		return PCIBIOS_DEVICE_NOT_FOUND;
	/*
	 * Note: the caller has already checked that off is
	 * suitably aligned and that len is 1, 2 or 4.
	 */
	cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
	switch (len) {
	case 1:
		out_8(cfg_data, val);
		break;
	case 2:
		out_le16(cfg_data, val);
		break;
	default:
		out_le32(cfg_data, val);
		break;
	}
	return PCIBIOS_SUCCESSFUL;
}

static struct pci_ops gg2_pci_ops =
{
	gg2_read_config,
	gg2_write_config
};

/*
 * Access functions for PCI config space using RTAS calls.
 */
int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
		     int len, u32 *val)
{
	struct pci_controller *hose = bus->sysdata;
	unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
		| (((bus->number - hose->first_busno) & 0xff) << 16)
		| (hose->index << 24);
        int ret = -1;
	int rval;

	rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
	*val = ret;
	return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
}

int rtas_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
		      int len, u32 val)
{
	struct pci_controller *hose = bus->sysdata;
	unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
		| (((bus->number - hose->first_busno) & 0xff) << 16)
		| (hose->index << 24);
	int rval;

	rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
			 addr, len, val);
	return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
}

static struct pci_ops rtas_pci_ops =
{
	rtas_read_config,
	rtas_write_config
};

volatile struct Hydra __iomem *Hydra = NULL;

int __init
hydra_init(void)
{
	struct device_node *np;
	struct resource r;

	np = find_devices("mac-io");
	if (np == NULL || of_address_to_resource(np, 0, &r))
		return 0;
	Hydra = ioremap(r.start, r.end-r.start);
	printk("Hydra Mac I/O at %lx\n", r.start);
	printk("Hydra Feature_Control was %x",
	       in_le32(&Hydra->Feature_Control));
	out_le32(&Hydra->Feature_Control, (HYDRA_FC_SCC_CELL_EN |
					   HYDRA_FC_SCSI_CELL_EN |
					   HYDRA_FC_SCCA_ENABLE |
					   HYDRA_FC_SCCB_ENABLE |
					   HYDRA_FC_ARB_BYPASS |
					   HYDRA_FC_MPIC_ENABLE |
					   HYDRA_FC_SLOW_SCC_PCLK |
					   HYDRA_FC_MPIC_IS_MASTER));
	printk(", now %x\n", in_le32(&Hydra->Feature_Control));
	return 1;
}

void __init
chrp_pcibios_fixup(void)
{
	struct pci_dev *dev = NULL;
	struct device_node *np;

	/* PCI interrupts are controlled by the OpenPIC */
	for_each_pci_dev(dev) {
		np = pci_device_to_OF_node(dev);
		if ((np != 0) && (np->n_intrs > 0) && (np->intrs[0].line != 0))
			dev->irq = np->intrs[0].line;
		pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
	}
}

#define PRG_CL_RESET_VALID 0x00010000

static void __init
setup_python(struct pci_controller *hose, struct device_node *dev)
{
	u32 __iomem *reg;
	u32 val;
	struct resource r;

	if (of_address_to_resource(dev, 0, &r)) {
		printk(KERN_ERR "No address for Python PCI controller\n");
		return;
	}

	/* Clear the magic go-slow bit */
	reg = ioremap(r.start + 0xf6000, 0x40);
	BUG_ON(!reg); 
	val = in_be32(&reg[12]);
	if (val & PRG_CL_RESET_VALID) {
		out_be32(&reg[12], val & ~PRG_CL_RESET_VALID);
		in_be32(&reg[12]);
	}
	iounmap(reg);

	setup_indirect_pci(hose, r.start + 0xf8000, r.start + 0xf8010);
}

/* Marvell Discovery II based Pegasos 2 */
static void __init setup_peg2(struct pci_controller *hose, struct device_node *dev)
{
	struct device_node *root = find_path_device("/");
	struct device_node *rtas;

	of_node_get(root);
	rtas = of_find_node_by_name (root, "rtas");
	if (rtas) {
		hose->ops = &rtas_pci_ops;
		of_node_put(rtas);
	} else {
		printk ("RTAS supporting Pegasos OF not found, please upgrade"
			" your firmware\n");
	}
	pci_assign_all_buses = 1;
}

void __init
chrp_find_bridges(void)
{
	struct device_node *dev;
	int *bus_range;
	int len, index = -1;
	struct pci_controller *hose;
	unsigned int *dma;
	char *model, *machine;
	int is_longtrail = 0, is_mot = 0, is_pegasos = 0;
	struct device_node *root = find_path_device("/");
	struct resource r;
	/*
	 * The PCI host bridge nodes on some machines don't have
	 * properties to adequately identify them, so we have to
	 * look at what sort of machine this is as well.
	 */
	machine = get_property(root, "model", NULL);
	if (machine != NULL) {
		is_longtrail = strncmp(machine, "IBM,LongTrail", 13) == 0;
		is_mot = strncmp(machine, "MOT", 3) == 0;
		if (strncmp(machine, "Pegasos2", 8) == 0)
			is_pegasos = 2;
		else if (strncmp(machine, "Pegasos", 7) == 0)
			is_pegasos = 1;
	}
	for (dev = root->child; dev != NULL; dev = dev->sibling) {
		if (dev->type == NULL || strcmp(dev->type, "pci") != 0)
			continue;
		++index;
		/* The GG2 bridge on the LongTrail doesn't have an address */
		if (of_address_to_resource(dev, 0, &r) && !is_longtrail) {
			printk(KERN_WARNING "Can't use %s: no address\n",
			       dev->full_name);
			continue;
		}
		bus_range = (int *) get_property(dev, "bus-range", &len);
		if (bus_range == NULL || len < 2 * sizeof(int)) {
			printk(KERN_WARNING "Can't get bus-range for %s\n",
				dev->full_name);
			continue;
		}
		if (bus_range[1] == bus_range[0])
			printk(KERN_INFO "PCI bus %d", bus_range[0]);
		else
			printk(KERN_INFO "PCI buses %d..%d",
			       bus_range[0], bus_range[1]);
		printk(" controlled by %s", dev->type);
		if (!is_longtrail)
			printk(" at %lx", r.start);
		printk("\n");

		hose = pcibios_alloc_controller();
		if (!hose) {
			printk("Can't allocate PCI controller structure for %s\n",
				dev->full_name);
			continue;
		}
		hose->arch_data = dev;
		hose->first_busno = bus_range[0];
		hose->last_busno = bus_range[1];

		model = get_property(dev, "model", NULL);
		if (model == NULL)
			model = "<none>";
		if (device_is_compatible(dev, "IBM,python")) {
			setup_python(hose, dev);
		} else if (is_mot
			   || strncmp(model, "Motorola, Grackle", 17) == 0) {
			setup_grackle(hose);
		} else if (is_longtrail) {
			void __iomem *p = ioremap(GG2_PCI_CONFIG_BASE, 0x80000);
			hose->ops = &gg2_pci_ops;
			hose->cfg_data = p;
			gg2_pci_config_base = p;
		} else if (is_pegasos == 1) {
			setup_indirect_pci(hose, 0xfec00cf8, 0xfee00cfc);
		} else if (is_pegasos == 2) {
			setup_peg2(hose, dev);
		} else {
			printk("No methods for %s (model %s), using RTAS\n",
			       dev->full_name, model);
			hose->ops = &rtas_pci_ops;
		}

		pci_process_bridge_OF_ranges(hose, dev, index == 0);

		/* check the first bridge for a property that we can
		   use to set pci_dram_offset */
		dma = (unsigned int *)
			get_property(dev, "ibm,dma-ranges", &len);
		if (index == 0 && dma != NULL && len >= 6 * sizeof(*dma)) {
			pci_dram_offset = dma[2] - dma[3];
			printk("pci_dram_offset = %lx\n", pci_dram_offset);
		}
	}

	/* Do not fixup interrupts from OF tree on pegasos */
	if (is_pegasos)
		ppc_md.pcibios_fixup = NULL;
}
OpenPOWER on IntegriCloud