summaryrefslogtreecommitdiffstats
path: root/drivers/pci/host/pci-layerscape.c
blob: 6537079963424b09bba4df9f0de93bd2a1e5820e (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
/*
 * PCIe host controller driver for Freescale Layerscape SoCs
 *
 * Copyright (C) 2014 Freescale Semiconductor.
 *
 * Author: Minghuan Lian <Minghuan.Lian@freescale.com>
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/resource.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>

#include "pcie-designware.h"

/* PEX1/2 Misc Ports Status Register */
#define SCFG_PEXMSCPORTSR(pex_idx)	(0x94 + (pex_idx) * 4)
#define LTSSM_STATE_SHIFT	20
#define LTSSM_STATE_MASK	0x3f
#define LTSSM_PCIE_L0		0x11 /* L0 state */

/* PEX Internal Configuration Registers */
#define PCIE_STRFMR1		0x71c /* Symbol Timer & Filter Mask Register1 */
#define PCIE_DBI_RO_WR_EN	0x8bc /* DBI Read-Only Write Enable Register */

/* PEX LUT registers */
#define PCIE_LUT_DBG		0x7FC /* PEX LUT Debug Register */

struct ls_pcie_drvdata {
	u32 lut_offset;
	u32 ltssm_shift;
	struct pcie_host_ops *ops;
};

struct ls_pcie {
	struct pcie_port pp;		/* pp.dbi_base is DT regs */
	void __iomem *lut;
	struct regmap *scfg;
	const struct ls_pcie_drvdata *drvdata;
	int index;
};

#define to_ls_pcie(x)	container_of(x, struct ls_pcie, pp)

static bool ls_pcie_is_bridge(struct ls_pcie *pcie)
{
	u32 header_type;

	header_type = ioread8(pcie->pp.dbi_base + PCI_HEADER_TYPE);
	header_type &= 0x7f;

	return header_type == PCI_HEADER_TYPE_BRIDGE;
}

/* Clear multi-function bit */
static void ls_pcie_clear_multifunction(struct ls_pcie *pcie)
{
	iowrite8(PCI_HEADER_TYPE_BRIDGE, pcie->pp.dbi_base + PCI_HEADER_TYPE);
}

/* Fix class value */
static void ls_pcie_fix_class(struct ls_pcie *pcie)
{
	iowrite16(PCI_CLASS_BRIDGE_PCI, pcie->pp.dbi_base + PCI_CLASS_DEVICE);
}

/* Drop MSG TLP except for Vendor MSG */
static void ls_pcie_drop_msg_tlp(struct ls_pcie *pcie)
{
	u32 val;

	val = ioread32(pcie->pp.dbi_base + PCIE_STRFMR1);
	val &= 0xDFFFFFFF;
	iowrite32(val, pcie->pp.dbi_base + PCIE_STRFMR1);
}

static int ls1021_pcie_link_up(struct pcie_port *pp)
{
	u32 state;
	struct ls_pcie *pcie = to_ls_pcie(pp);

	if (!pcie->scfg)
		return 0;

	regmap_read(pcie->scfg, SCFG_PEXMSCPORTSR(pcie->index), &state);
	state = (state >> LTSSM_STATE_SHIFT) & LTSSM_STATE_MASK;

	if (state < LTSSM_PCIE_L0)
		return 0;

	return 1;
}

static void ls1021_pcie_host_init(struct pcie_port *pp)
{
	struct device *dev = pp->dev;
	struct ls_pcie *pcie = to_ls_pcie(pp);
	u32 index[2];

	pcie->scfg = syscon_regmap_lookup_by_phandle(dev->of_node,
						     "fsl,pcie-scfg");
	if (IS_ERR(pcie->scfg)) {
		dev_err(dev, "No syscfg phandle specified\n");
		pcie->scfg = NULL;
		return;
	}

	if (of_property_read_u32_array(dev->of_node,
				       "fsl,pcie-scfg", index, 2)) {
		pcie->scfg = NULL;
		return;
	}
	pcie->index = index[1];

	dw_pcie_setup_rc(pp);

	ls_pcie_drop_msg_tlp(pcie);
}

static int ls_pcie_link_up(struct pcie_port *pp)
{
	struct ls_pcie *pcie = to_ls_pcie(pp);
	u32 state;

	state = (ioread32(pcie->lut + PCIE_LUT_DBG) >>
		 pcie->drvdata->ltssm_shift) &
		 LTSSM_STATE_MASK;

	if (state < LTSSM_PCIE_L0)
		return 0;

	return 1;
}

static void ls_pcie_host_init(struct pcie_port *pp)
{
	struct ls_pcie *pcie = to_ls_pcie(pp);

	iowrite32(1, pcie->pp.dbi_base + PCIE_DBI_RO_WR_EN);
	ls_pcie_fix_class(pcie);
	ls_pcie_clear_multifunction(pcie);
	ls_pcie_drop_msg_tlp(pcie);
	iowrite32(0, pcie->pp.dbi_base + PCIE_DBI_RO_WR_EN);
}

static int ls_pcie_msi_host_init(struct pcie_port *pp,
				 struct msi_controller *chip)
{
	struct device *dev = pp->dev;
	struct device_node *np = dev->of_node;
	struct device_node *msi_node;

	/*
	 * The MSI domain is set by the generic of_msi_configure().  This
	 * .msi_host_init() function keeps us from doing the default MSI
	 * domain setup in dw_pcie_host_init() and also enforces the
	 * requirement that "msi-parent" exists.
	 */
	msi_node = of_parse_phandle(np, "msi-parent", 0);
	if (!msi_node) {
		dev_err(dev, "failed to find msi-parent\n");
		return -EINVAL;
	}

	return 0;
}

static struct pcie_host_ops ls1021_pcie_host_ops = {
	.link_up = ls1021_pcie_link_up,
	.host_init = ls1021_pcie_host_init,
	.msi_host_init = ls_pcie_msi_host_init,
};

static struct pcie_host_ops ls_pcie_host_ops = {
	.link_up = ls_pcie_link_up,
	.host_init = ls_pcie_host_init,
	.msi_host_init = ls_pcie_msi_host_init,
};

static struct ls_pcie_drvdata ls1021_drvdata = {
	.ops = &ls1021_pcie_host_ops,
};

static struct ls_pcie_drvdata ls1043_drvdata = {
	.lut_offset = 0x10000,
	.ltssm_shift = 24,
	.ops = &ls_pcie_host_ops,
};

static struct ls_pcie_drvdata ls2080_drvdata = {
	.lut_offset = 0x80000,
	.ltssm_shift = 0,
	.ops = &ls_pcie_host_ops,
};

static const struct of_device_id ls_pcie_of_match[] = {
	{ .compatible = "fsl,ls1021a-pcie", .data = &ls1021_drvdata },
	{ .compatible = "fsl,ls1043a-pcie", .data = &ls1043_drvdata },
	{ .compatible = "fsl,ls2080a-pcie", .data = &ls2080_drvdata },
	{ .compatible = "fsl,ls2085a-pcie", .data = &ls2080_drvdata },
	{ },
};

static int __init ls_add_pcie_port(struct ls_pcie *pcie)
{
	struct pcie_port *pp = &pcie->pp;
	struct device *dev = pp->dev;
	int ret;

	ret = dw_pcie_host_init(pp);
	if (ret) {
		dev_err(dev, "failed to initialize host\n");
		return ret;
	}

	return 0;
}

static int __init ls_pcie_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	const struct of_device_id *match;
	struct ls_pcie *pcie;
	struct pcie_port *pp;
	struct resource *dbi_base;
	int ret;

	match = of_match_device(ls_pcie_of_match, dev);
	if (!match)
		return -ENODEV;

	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
	if (!pcie)
		return -ENOMEM;

	pp = &pcie->pp;
	pp->dev = dev;
	pcie->drvdata = match->data;
	pp->ops = pcie->drvdata->ops;

	dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
	pcie->pp.dbi_base = devm_ioremap_resource(dev, dbi_base);
	if (IS_ERR(pcie->pp.dbi_base)) {
		dev_err(dev, "missing *regs* space\n");
		return PTR_ERR(pcie->pp.dbi_base);
	}

	pcie->lut = pcie->pp.dbi_base + pcie->drvdata->lut_offset;

	if (!ls_pcie_is_bridge(pcie))
		return -ENODEV;

	ret = ls_add_pcie_port(pcie);
	if (ret < 0)
		return ret;

	return 0;
}

static struct platform_driver ls_pcie_driver = {
	.driver = {
		.name = "layerscape-pcie",
		.of_match_table = ls_pcie_of_match,
	},
};
builtin_platform_driver_probe(ls_pcie_driver, ls_pcie_probe);