1/*
2 * PCI interface driver for DW SPI Core
3 *
4 * Copyright (c) 2009, 2014 Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13 * more details.
14 */
15
16#include <linux/interrupt.h>
17#include <linux/pci.h>
18#include <linux/slab.h>
19#include <linux/spi/spi.h>
20#include <linux/module.h>
21
22#include "spi-dw.h"
23
24#define DRIVER_NAME "dw_spi_pci"
25
26struct dw_spi_pci {
27	struct pci_dev	*pdev;
28	struct dw_spi	dws;
29};
30
31struct spi_pci_desc {
32	int	(*setup)(struct dw_spi *);
33	u16	num_cs;
34	u16	bus_num;
35};
36
37static struct spi_pci_desc spi_pci_mid_desc_1 = {
38	.setup = dw_spi_mid_init,
39	.num_cs = 5,
40	.bus_num = 0,
41};
42
43static struct spi_pci_desc spi_pci_mid_desc_2 = {
44	.setup = dw_spi_mid_init,
45	.num_cs = 2,
46	.bus_num = 1,
47};
48
49static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
50{
51	struct dw_spi_pci *dwpci;
52	struct dw_spi *dws;
53	struct spi_pci_desc *desc = (struct spi_pci_desc *)ent->driver_data;
54	int pci_bar = 0;
55	int ret;
56
57	ret = pcim_enable_device(pdev);
58	if (ret)
59		return ret;
60
61	dwpci = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_pci),
62			GFP_KERNEL);
63	if (!dwpci)
64		return -ENOMEM;
65
66	dwpci->pdev = pdev;
67	dws = &dwpci->dws;
68
69	/* Get basic io resource and map it */
70	dws->paddr = pci_resource_start(pdev, pci_bar);
71
72	ret = pcim_iomap_regions(pdev, 1 << pci_bar, pci_name(pdev));
73	if (ret)
74		return ret;
75
76	dws->regs = pcim_iomap_table(pdev)[pci_bar];
77
78	dws->irq = pdev->irq;
79
80	/*
81	 * Specific handling for paltforms, like dma setup,
82	 * clock rate, FIFO depth.
83	 */
84	if (desc) {
85		dws->num_cs = desc->num_cs;
86		dws->bus_num = desc->bus_num;
87
88		if (desc->setup) {
89			ret = desc->setup(dws);
90			if (ret)
91				return ret;
92		}
93	} else {
94		return -ENODEV;
95	}
96
97	ret = dw_spi_add_host(&pdev->dev, dws);
98	if (ret)
99		return ret;
100
101	/* PCI hook and SPI hook use the same drv data */
102	pci_set_drvdata(pdev, dwpci);
103
104	dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n",
105		pdev->vendor, pdev->device);
106
107	return 0;
108}
109
110static void spi_pci_remove(struct pci_dev *pdev)
111{
112	struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
113
114	dw_spi_remove_host(&dwpci->dws);
115}
116
117#ifdef CONFIG_PM_SLEEP
118static int spi_suspend(struct device *dev)
119{
120	struct pci_dev *pdev = to_pci_dev(dev);
121	struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
122
123	return dw_spi_suspend_host(&dwpci->dws);
124}
125
126static int spi_resume(struct device *dev)
127{
128	struct pci_dev *pdev = to_pci_dev(dev);
129	struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
130
131	return dw_spi_resume_host(&dwpci->dws);
132}
133#endif
134
135static SIMPLE_DEV_PM_OPS(dw_spi_pm_ops, spi_suspend, spi_resume);
136
137static const struct pci_device_id pci_ids[] = {
138	/* Intel MID platform SPI controller 0 */
139	/*
140	 * The access to the device 8086:0801 is disabled by HW, since it's
141	 * exclusively used by SCU to communicate with MSIC.
142	 */
143	/* Intel MID platform SPI controller 1 */
144	{ PCI_VDEVICE(INTEL, 0x0800), (kernel_ulong_t)&spi_pci_mid_desc_1},
145	/* Intel MID platform SPI controller 2 */
146	{ PCI_VDEVICE(INTEL, 0x0812), (kernel_ulong_t)&spi_pci_mid_desc_2},
147	{},
148};
149
150static struct pci_driver dw_spi_driver = {
151	.name =		DRIVER_NAME,
152	.id_table =	pci_ids,
153	.probe =	spi_pci_probe,
154	.remove =	spi_pci_remove,
155	.driver         = {
156		.pm     = &dw_spi_pm_ops,
157	},
158};
159
160module_pci_driver(dw_spi_driver);
161
162MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
163MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
164MODULE_LICENSE("GPL v2");
165