tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 spi_pci_desc {
27 int (*setup)(struct dw_spi *);
28 u16 num_cs;
29 u16 bus_num;
30};
31
32static struct spi_pci_desc spi_pci_mid_desc_1 = {
33 .setup = dw_spi_mid_init,
34 .num_cs = 5,
35 .bus_num = 0,
36};
37
38static struct spi_pci_desc spi_pci_mid_desc_2 = {
39 .setup = dw_spi_mid_init,
40 .num_cs = 2,
41 .bus_num = 1,
42};
43
44static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
45{
46 struct dw_spi *dws;
47 struct spi_pci_desc *desc = (struct spi_pci_desc *)ent->driver_data;
48 int pci_bar = 0;
49 int ret;
50
51 ret = pcim_enable_device(pdev);
52 if (ret)
53 return ret;
54
55 dws = devm_kzalloc(&pdev->dev, sizeof(*dws), GFP_KERNEL);
56 if (!dws)
57 return -ENOMEM;
58
59 /* Get basic io resource and map it */
60 dws->paddr = pci_resource_start(pdev, pci_bar);
61
62 ret = pcim_iomap_regions(pdev, 1 << pci_bar, pci_name(pdev));
63 if (ret)
64 return ret;
65
66 dws->regs = pcim_iomap_table(pdev)[pci_bar];
67 dws->irq = pdev->irq;
68
69 /*
70 * Specific handling for paltforms, like dma setup,
71 * clock rate, FIFO depth.
72 */
73 if (desc) {
74 dws->num_cs = desc->num_cs;
75 dws->bus_num = desc->bus_num;
76
77 if (desc->setup) {
78 ret = desc->setup(dws);
79 if (ret)
80 return ret;
81 }
82 } else {
83 return -ENODEV;
84 }
85
86 ret = dw_spi_add_host(&pdev->dev, dws);
87 if (ret)
88 return ret;
89
90 /* PCI hook and SPI hook use the same drv data */
91 pci_set_drvdata(pdev, dws);
92
93 dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n",
94 pdev->vendor, pdev->device);
95
96 return 0;
97}
98
99static void spi_pci_remove(struct pci_dev *pdev)
100{
101 struct dw_spi *dws = pci_get_drvdata(pdev);
102
103 dw_spi_remove_host(dws);
104}
105
106#ifdef CONFIG_PM_SLEEP
107static int spi_suspend(struct device *dev)
108{
109 struct pci_dev *pdev = to_pci_dev(dev);
110 struct dw_spi *dws = pci_get_drvdata(pdev);
111
112 return dw_spi_suspend_host(dws);
113}
114
115static int spi_resume(struct device *dev)
116{
117 struct pci_dev *pdev = to_pci_dev(dev);
118 struct dw_spi *dws = pci_get_drvdata(pdev);
119
120 return dw_spi_resume_host(dws);
121}
122#endif
123
124static SIMPLE_DEV_PM_OPS(dw_spi_pm_ops, spi_suspend, spi_resume);
125
126static const struct pci_device_id pci_ids[] = {
127 /* Intel MID platform SPI controller 0 */
128 /*
129 * The access to the device 8086:0801 is disabled by HW, since it's
130 * exclusively used by SCU to communicate with MSIC.
131 */
132 /* Intel MID platform SPI controller 1 */
133 { PCI_VDEVICE(INTEL, 0x0800), (kernel_ulong_t)&spi_pci_mid_desc_1},
134 /* Intel MID platform SPI controller 2 */
135 { PCI_VDEVICE(INTEL, 0x0812), (kernel_ulong_t)&spi_pci_mid_desc_2},
136 {},
137};
138
139static struct pci_driver dw_spi_driver = {
140 .name = DRIVER_NAME,
141 .id_table = pci_ids,
142 .probe = spi_pci_probe,
143 .remove = spi_pci_remove,
144 .driver = {
145 .pm = &dw_spi_pm_ops,
146 },
147};
148
149module_pci_driver(dw_spi_driver);
150
151MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
152MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
153MODULE_LICENSE("GPL v2");