aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/86xx/pci.c
blob: 73cd5b05a84eb49b92270fbeaa71168671fc64fa (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
/*
 * MPC86XX pci setup code
 *
 * Recode: ZHANG WEI <wei.zhang@freescale.com>
 * Initial author: Xianghua Xiao <x.xiao@freescale.com>
 *
 * Copyright 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/types.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/serial.h>

#include <asm/system.h>
#include <asm/atomic.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <sysdev/fsl_soc.h>
#include <sysdev/fsl_pcie.h>

#include "mpc86xx.h"

#undef DEBUG

#ifdef DEBUG
#define DBG(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
#else
#define DBG(fmt, args...)
#endif

struct pcie_outbound_window_regs {
	uint    pexotar;               /* 0x.0 - PCI Express outbound translation address register */
	uint    pexotear;              /* 0x.4 - PCI Express outbound translation extended address register */
	uint    pexowbar;              /* 0x.8 - PCI Express outbound window base address register */
	char    res1[4];
	uint    pexowar;               /* 0x.10 - PCI Express outbound window attributes register */
	char    res2[12];
};

struct pcie_inbound_window_regs {
	uint    pexitar;               /* 0x.0 - PCI Express inbound translation address register */
	char    res1[4];
	uint    pexiwbar;              /* 0x.8 - PCI Express inbound window base address register */
	uint    pexiwbear;             /* 0x.c - PCI Express inbound window base extended address register */
	uint    pexiwar;               /* 0x.10 - PCI Express inbound window attributes register */
	char    res2[12];
};

static void __init setup_pcie_atmu(struct pci_controller *hose, struct resource *rsrc)
{
	volatile struct ccsr_pex *pcie;
	volatile struct pcie_outbound_window_regs *pcieow;
	volatile struct pcie_inbound_window_regs *pcieiw;
	int i = 0;

	DBG("PCIE memory map start 0x%x, size 0x%x\n", rsrc->start,
			rsrc->end - rsrc->start + 1);
	pcie = ioremap(rsrc->start, rsrc->end - rsrc->start + 1);

	/* Disable all windows (except pexowar0 since its ignored) */
	pcie->pexowar1 = 0;
	pcie->pexowar2 = 0;
 	pcie->pexowar3 = 0;
 	pcie->pexowar4 = 0;
 	pcie->pexiwar1 = 0;
 	pcie->pexiwar2 = 0;
 	pcie->pexiwar3 = 0;

 	pcieow = (struct pcie_outbound_window_regs *)&pcie->pexotar1;
 	pcieiw = (struct pcie_inbound_window_regs *)&pcie->pexitar1;

 	/* Setup outbound MEM window */
 	for(i = 0; i < 3; i++)
 		if (hose->mem_resources[i].flags & IORESOURCE_MEM){
 			DBG("PCIE MEM resource start 0x%08x, size 0x%08x.\n",
 				hose->mem_resources[i].start,
 				hose->mem_resources[i].end
 				  - hose->mem_resources[i].start + 1);
 			pcieow->pexotar = (hose->mem_resources[i].start) >> 12
 				& 0x000fffff;
 			pcieow->pexotear = 0;
 			pcieow->pexowbar = (hose->mem_resources[i].start) >> 12
 				& 0x000fffff;
 			/* Enable, Mem R/W */
 			pcieow->pexowar = 0x80044000 |
 				(__ilog2(hose->mem_resources[i].end
 					 - hose->mem_resources[i].start + 1)
 				 - 1);
 			pcieow++;
 		}

 	/* Setup outbound IO window */
 	if (hose->io_resource.flags & IORESOURCE_IO){
 		DBG("PCIE IO resource start 0x%08x, size 0x%08x, phy base 0x%08x.\n",
 			hose->io_resource.start,
 			hose->io_resource.end - hose->io_resource.start + 1,
 			hose->io_base_phys);
 		pcieow->pexotar = (hose->io_resource.start) >> 12 & 0x000fffff;
 		pcieow->pexotear = 0;
 		pcieow->pexowbar = (hose->io_base_phys) >> 12 & 0x000fffff;
 		/* Enable, IO R/W */
 		pcieow->pexowar = 0x80088000 | (__ilog2(hose->io_resource.end
 					- hose->io_resource.start + 1) - 1);
 	}

 	/* Setup 2G inbound Memory Window @ 0 */
 	pcieiw->pexitar = 0x00000000;
 	pcieiw->pexiwbar = 0x00000000;
 	/* Enable, Prefetch, Local Mem, Snoop R/W, 2G */
 	pcieiw->pexiwar = 0xa0f5501e;
}

static void __init
mpc86xx_setup_pcie(struct pci_controller *hose, u32 pcie_offset, u32 pcie_size)
{
	u16 cmd;

	DBG("PCIE host controller register offset 0x%08x, size 0x%08x.\n",
			pcie_offset, pcie_size);

	early_read_config_word(hose, 0, 0, PCI_COMMAND, &cmd);
	cmd |= PCI_COMMAND_SERR | PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY
	    | PCI_COMMAND_IO;
	early_write_config_word(hose, 0, 0, PCI_COMMAND, cmd);

	early_write_config_byte(hose, 0, 0, PCI_LATENCY_TIMER, 0x80);
}

static void __devinit quirk_fsl_pcie_transparent(struct pci_dev *dev)
{
	struct resource *res;
	int i, res_idx = PCI_BRIDGE_RESOURCES;
	struct pci_controller *hose;

	/*
	 * Make the bridge be transparent.
	 */
	dev->transparent = 1;

	hose = pci_bus_to_host(dev->bus);
	if (!hose) {
		printk(KERN_ERR "Can't find hose for bus %d\n",
		       dev->bus->number);
		return;
	}

	if (hose->io_resource.flags) {
		res = &dev->resource[res_idx++];
		res->start = hose->io_resource.start;
		res->end = hose->io_resource.end;
		res->flags = hose->io_resource.flags;
	}

	for (i = 0; i < 3; i++) {
		res = &dev->resource[res_idx + i];
		res->start = hose->mem_resources[i].start;
		res->end = hose->mem_resources[i].end;
		res->flags = hose->mem_resources[i].flags;
	}
}


DECLARE_PCI_FIXUP_EARLY(0x1957, 0x7010, quirk_fsl_pcie_transparent);
DECLARE_PCI_FIXUP_EARLY(0x1957, 0x7011, quirk_fsl_pcie_transparent);

#define PCIE_LTSSM	0x404	/* PCIe Link Training and Status */
#define PCIE_LTSSM_L0	0x16	/* L0 state */

int __init mpc86xx_add_bridge(struct device_node *dev)
{
	int len;
	struct pci_controller *hose;
	struct resource rsrc;
	const int *bus_range;
	int has_address = 0;
	int primary = 0;
	u16 val;

	DBG("Adding PCIE host bridge %s\n", dev->full_name);

	/* Fetch host bridge registers address */
	has_address = (of_address_to_resource(dev, 0, &rsrc) == 0);

	/* Get bus range if any */
	bus_range = of_get_property(dev, "bus-range", &len);
	if (bus_range == NULL || len < 2 * sizeof(int))
		printk(KERN_WARNING "Can't get bus-range for %s, assume"
		       " bus 0\n", dev->full_name);

	pci_assign_all_buses = 1;
	hose = pcibios_alloc_controller(dev);
	if (!hose)
		return -ENOMEM;

	hose->indirect_type = PPC_INDIRECT_TYPE_EXT_REG |
				PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS;

	hose->first_busno = bus_range ? bus_range[0] : 0x0;
	hose->last_busno = bus_range ? bus_range[1] : 0xff;

	setup_indirect_pci(hose, rsrc.start, rsrc.start + 0x4);

	/* Probe the hose link training status */
	early_read_config_word(hose, 0, 0, PCIE_LTSSM, &val);
	if (val < PCIE_LTSSM_L0)
		return -ENXIO;

	/* Setup the PCIE host controller. */
	mpc86xx_setup_pcie(hose, rsrc.start, rsrc.end - rsrc.start + 1);

	if ((rsrc.start & 0xfffff) == 0x8000)
		primary = 1;

	printk(KERN_INFO "Found MPC86xx PCIE host bridge at 0x%08lx. "
	       "Firmware bus number: %d->%d\n",
	       (unsigned long) rsrc.start,
	       hose->first_busno, hose->last_busno);

	DBG(" ->Hose at 0x%p, cfg_addr=0x%p,cfg_data=0x%p\n",
		hose, hose->cfg_addr, hose->cfg_data);

	/* Interpret the "ranges" property */
	/* This also maps the I/O region and sets isa_io/mem_base */
	pci_process_bridge_OF_ranges(hose, dev, primary);

	/* Setup PEX window registers */
	setup_pcie_atmu(hose, &rsrc);

	return 0;
}