aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/pci/pci-lantiq.c
blob: 95681789b51e44978c5725701e889abf28da1b00 (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
/*
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License version 2 as published
 *  by the Free Software Foundation.
 *
 *  Copyright (C) 2010 John Crispin <blogic@openwrt.org>
 */

#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/of_pci.h>

#include <asm/pci.h>
#include <asm/gpio.h>
#include <asm/addrspace.h>

#include <lantiq_soc.h>
#include <lantiq_irq.h>

#include "pci-lantiq.h"

#define PCI_CR_FCI_ADDR_MAP0		0x00C0
#define PCI_CR_FCI_ADDR_MAP1		0x00C4
#define PCI_CR_FCI_ADDR_MAP2		0x00C8
#define PCI_CR_FCI_ADDR_MAP3		0x00CC
#define PCI_CR_FCI_ADDR_MAP4		0x00D0
#define PCI_CR_FCI_ADDR_MAP5		0x00D4
#define PCI_CR_FCI_ADDR_MAP6		0x00D8
#define PCI_CR_FCI_ADDR_MAP7		0x00DC
#define PCI_CR_CLK_CTRL			0x0000
#define PCI_CR_PCI_MOD			0x0030
#define PCI_CR_PC_ARB			0x0080
#define PCI_CR_FCI_ADDR_MAP11hg		0x00E4
#define PCI_CR_BAR11MASK		0x0044
#define PCI_CR_BAR12MASK		0x0048
#define PCI_CR_BAR13MASK		0x004C
#define PCI_CS_BASE_ADDR1		0x0010
#define PCI_CR_PCI_ADDR_MAP11		0x0064
#define PCI_CR_FCI_BURST_LENGTH		0x00E8
#define PCI_CR_PCI_EOI			0x002C
#define PCI_CS_STS_CMD			0x0004

#define PCI_MASTER0_REQ_MASK_2BITS	8
#define PCI_MASTER1_REQ_MASK_2BITS	10
#define PCI_MASTER2_REQ_MASK_2BITS	12
#define INTERNAL_ARB_ENABLE_BIT		0

#define LTQ_CGU_IFCCR		0x0018
#define LTQ_CGU_PCICR		0x0034

#define ltq_pci_w32(x, y)	ltq_w32((x), ltq_pci_membase + (y))
#define ltq_pci_r32(x)		ltq_r32(ltq_pci_membase + (x))

#define ltq_pci_cfg_w32(x, y)	ltq_w32((x), ltq_pci_mapped_cfg + (y))
#define ltq_pci_cfg_r32(x)	ltq_r32(ltq_pci_mapped_cfg + (x))

__iomem void *ltq_pci_mapped_cfg;
static __iomem void *ltq_pci_membase;

static int reset_gpio;
static struct clk *clk_pci, *clk_external;
static struct resource pci_io_resource;
static struct resource pci_mem_resource;
static struct pci_ops pci_ops = {
	.read	= ltq_pci_read_config_dword,
	.write	= ltq_pci_write_config_dword
};

static struct pci_controller pci_controller = {
	.pci_ops	= &pci_ops,
	.mem_resource	= &pci_mem_resource,
	.mem_offset	= 0x00000000UL,
	.io_resource	= &pci_io_resource,
	.io_offset	= 0x00000000UL,
};

static inline u32 ltq_calc_bar11mask(void)
{
	u32 mem, bar11mask;

	/* BAR11MASK value depends on available memory on system. */
	mem = num_physpages * PAGE_SIZE;
	bar11mask = (0x0ffffff0 & ~((1 << (fls(mem) - 1)) - 1)) | 8;

	return bar11mask;
}

static int ltq_pci_startup(struct platform_device *pdev)
{
	struct device_node *node = pdev->dev.of_node;
	const __be32 *req_mask, *bus_clk;
	u32 temp_buffer;

	/* get our clocks */
	clk_pci = clk_get(&pdev->dev, NULL);
	if (IS_ERR(clk_pci)) {
		dev_err(&pdev->dev, "failed to get pci clock\n");
		return PTR_ERR(clk_pci);
	}

	clk_external = clk_get(&pdev->dev, "external");
	if (IS_ERR(clk_external)) {
		clk_put(clk_pci);
		dev_err(&pdev->dev, "failed to get external pci clock\n");
		return PTR_ERR(clk_external);
	}

	/* read the bus speed that we want */
	bus_clk = of_get_property(node, "lantiq,bus-clock", NULL);
	if (bus_clk)
		clk_set_rate(clk_pci, *bus_clk);

	/* and enable the clocks */
	clk_enable(clk_pci);
	if (of_find_property(node, "lantiq,external-clock", NULL))
		clk_enable(clk_external);
	else
		clk_disable(clk_external);

	/* setup reset gpio used by pci */
	reset_gpio = of_get_named_gpio(node, "gpio-reset", 0);
	if (gpio_is_valid(reset_gpio))
		devm_gpio_request(&pdev->dev, reset_gpio, "pci-reset");

	/* enable auto-switching between PCI and EBU */
	ltq_pci_w32(0xa, PCI_CR_CLK_CTRL);

	/* busy, i.e. configuration is not done, PCI access has to be retried */
	ltq_pci_w32(ltq_pci_r32(PCI_CR_PCI_MOD) & ~(1 << 24), PCI_CR_PCI_MOD);
	wmb();
	/* BUS Master/IO/MEM access */
	ltq_pci_cfg_w32(ltq_pci_cfg_r32(PCI_CS_STS_CMD) | 7, PCI_CS_STS_CMD);

	/* enable external 2 PCI masters */
	temp_buffer = ltq_pci_r32(PCI_CR_PC_ARB);
	/* setup the request mask */
	req_mask = of_get_property(node, "req-mask", NULL);
	if (req_mask)
		temp_buffer &= ~((*req_mask & 0xf) << 16);
	else
		temp_buffer &= ~0xf0000;
	/* enable internal arbiter */
	temp_buffer |= (1 << INTERNAL_ARB_ENABLE_BIT);
	/* enable internal PCI master reqest */
	temp_buffer &= (~(3 << PCI_MASTER0_REQ_MASK_2BITS));

	/* enable EBU request */
	temp_buffer &= (~(3 << PCI_MASTER1_REQ_MASK_2BITS));

	/* enable all external masters request */
	temp_buffer &= (~(3 << PCI_MASTER2_REQ_MASK_2BITS));
	ltq_pci_w32(temp_buffer, PCI_CR_PC_ARB);
	wmb();

	/* setup BAR memory regions */
	ltq_pci_w32(0x18000000, PCI_CR_FCI_ADDR_MAP0);
	ltq_pci_w32(0x18400000, PCI_CR_FCI_ADDR_MAP1);
	ltq_pci_w32(0x18800000, PCI_CR_FCI_ADDR_MAP2);
	ltq_pci_w32(0x18c00000, PCI_CR_FCI_ADDR_MAP3);
	ltq_pci_w32(0x19000000, PCI_CR_FCI_ADDR_MAP4);
	ltq_pci_w32(0x19400000, PCI_CR_FCI_ADDR_MAP5);
	ltq_pci_w32(0x19800000, PCI_CR_FCI_ADDR_MAP6);
	ltq_pci_w32(0x19c00000, PCI_CR_FCI_ADDR_MAP7);
	ltq_pci_w32(0x1ae00000, PCI_CR_FCI_ADDR_MAP11hg);
	ltq_pci_w32(ltq_calc_bar11mask(), PCI_CR_BAR11MASK);
	ltq_pci_w32(0, PCI_CR_PCI_ADDR_MAP11);
	ltq_pci_w32(0, PCI_CS_BASE_ADDR1);
	/* both TX and RX endian swap are enabled */
	ltq_pci_w32(ltq_pci_r32(PCI_CR_PCI_EOI) | 3, PCI_CR_PCI_EOI);
	wmb();
	ltq_pci_w32(ltq_pci_r32(PCI_CR_BAR12MASK) | 0x80000000,
		PCI_CR_BAR12MASK);
	ltq_pci_w32(ltq_pci_r32(PCI_CR_BAR13MASK) | 0x80000000,
		PCI_CR_BAR13MASK);
	/*use 8 dw burst length */
	ltq_pci_w32(0x303, PCI_CR_FCI_BURST_LENGTH);
	ltq_pci_w32(ltq_pci_r32(PCI_CR_PCI_MOD) | (1 << 24), PCI_CR_PCI_MOD);
	wmb();

	/* setup irq line */
	ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_PCC_CON) | 0xc, LTQ_EBU_PCC_CON);
	ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_PCC_IEN) | 0x10, LTQ_EBU_PCC_IEN);

	/* toggle reset pin */
	if (gpio_is_valid(reset_gpio)) {
		__gpio_set_value(reset_gpio, 0);
		wmb();
		mdelay(1);
		__gpio_set_value(reset_gpio, 1);
	}
	return 0;
}

static int ltq_pci_probe(struct platform_device *pdev)
{
	struct resource *res_cfg, *res_bridge;

	pci_clear_flags(PCI_PROBE_ONLY);

	res_cfg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	res_bridge = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (!res_cfg || !res_bridge) {
		dev_err(&pdev->dev, "missing memory reources\n");
		return -EINVAL;
	}

	ltq_pci_membase = devm_request_and_ioremap(&pdev->dev, res_bridge);
	ltq_pci_mapped_cfg = devm_request_and_ioremap(&pdev->dev, res_cfg);

	if (!ltq_pci_membase || !ltq_pci_mapped_cfg) {
		dev_err(&pdev->dev, "failed to remap resources\n");
		return -ENOMEM;
	}

	ltq_pci_startup(pdev);

	pci_load_of_ranges(&pci_controller, pdev->dev.of_node);
	register_pci_controller(&pci_controller);
	return 0;
}

static const struct of_device_id ltq_pci_match[] = {
	{ .compatible = "lantiq,pci-xway" },
	{},
};
MODULE_DEVICE_TABLE(of, ltq_pci_match);

static struct platform_driver ltq_pci_driver = {
	.probe = ltq_pci_probe,
	.driver = {
		.name = "pci-xway",
		.owner = THIS_MODULE,
		.of_match_table = ltq_pci_match,
	},
};

int __init pcibios_init(void)
{
	int ret = platform_driver_register(&ltq_pci_driver);
	if (ret)
		pr_info("pci-xway: Error registering platform driver!");
	return ret;
}

arch_initcall(pcibios_init);