blob: 1f52755dc87824e9764b354557c86dfd901dc4a3 [file] [log] [blame]
Feng Tange24c7452009-12-14 14:20:22 -08001/*
2 * mrst_spi_pci.c - PCI interface driver for DW SPI Core
3 *
4 * Copyright (c) 2009, 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 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20#include <linux/interrupt.h>
21#include <linux/pci.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Feng Tange24c7452009-12-14 14:20:22 -080023#include <linux/spi/dw_spi.h>
24#include <linux/spi/spi.h>
25
26#define DRIVER_NAME "dw_spi_pci"
27
28struct dw_spi_pci {
29 struct pci_dev *pdev;
30 struct dw_spi dws;
31};
32
33static int __devinit spi_pci_probe(struct pci_dev *pdev,
34 const struct pci_device_id *ent)
35{
36 struct dw_spi_pci *dwpci;
37 struct dw_spi *dws;
38 int pci_bar = 0;
39 int ret;
40
41 printk(KERN_INFO "DW: found PCI SPI controller(ID: %04x:%04x)\n",
42 pdev->vendor, pdev->device);
43
44 ret = pci_enable_device(pdev);
45 if (ret)
46 return ret;
47
48 dwpci = kzalloc(sizeof(struct dw_spi_pci), GFP_KERNEL);
49 if (!dwpci) {
50 ret = -ENOMEM;
51 goto err_disable;
52 }
53
54 dwpci->pdev = pdev;
55 dws = &dwpci->dws;
56
57 /* Get basic io resource and map it */
58 dws->paddr = pci_resource_start(pdev, pci_bar);
59 dws->iolen = pci_resource_len(pdev, pci_bar);
60
61 ret = pci_request_region(pdev, pci_bar, dev_name(&pdev->dev));
62 if (ret)
63 goto err_kfree;
64
65 dws->regs = ioremap_nocache((unsigned long)dws->paddr,
66 pci_resource_len(pdev, pci_bar));
67 if (!dws->regs) {
68 ret = -ENOMEM;
69 goto err_release_reg;
70 }
71
72 dws->parent_dev = &pdev->dev;
73 dws->bus_num = 0;
74 dws->num_cs = 4;
75 dws->max_freq = 25000000; /* for Moorestwon */
76 dws->irq = pdev->irq;
Feng Tang552e4502010-01-20 13:49:45 -070077 dws->fifo_len = 40; /* FIFO has 40 words buffer */
Feng Tange24c7452009-12-14 14:20:22 -080078
79 ret = dw_spi_add_host(dws);
80 if (ret)
81 goto err_unmap;
82
83 /* PCI hook and SPI hook use the same drv data */
84 pci_set_drvdata(pdev, dwpci);
85 return 0;
86
87err_unmap:
88 iounmap(dws->regs);
89err_release_reg:
90 pci_release_region(pdev, pci_bar);
91err_kfree:
92 kfree(dwpci);
93err_disable:
94 pci_disable_device(pdev);
95 return ret;
96}
97
98static void __devexit spi_pci_remove(struct pci_dev *pdev)
99{
100 struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
101
102 pci_set_drvdata(pdev, NULL);
Feng Tang51f921c2010-01-20 13:49:45 -0700103 dw_spi_remove_host(&dwpci->dws);
Feng Tange24c7452009-12-14 14:20:22 -0800104 iounmap(dwpci->dws.regs);
105 pci_release_region(pdev, 0);
106 kfree(dwpci);
107 pci_disable_device(pdev);
108}
109
110#ifdef CONFIG_PM
111static int spi_suspend(struct pci_dev *pdev, pm_message_t state)
112{
113 struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
114 int ret;
115
116 ret = dw_spi_suspend_host(&dwpci->dws);
117 if (ret)
118 return ret;
119 pci_save_state(pdev);
120 pci_disable_device(pdev);
121 pci_set_power_state(pdev, pci_choose_state(pdev, state));
122 return ret;
123}
124
125static int spi_resume(struct pci_dev *pdev)
126{
127 struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
128 int ret;
129
130 pci_set_power_state(pdev, PCI_D0);
131 pci_restore_state(pdev);
132 ret = pci_enable_device(pdev);
133 if (ret)
134 return ret;
135 return dw_spi_resume_host(&dwpci->dws);
136}
137#else
138#define spi_suspend NULL
139#define spi_resume NULL
140#endif
141
142static const struct pci_device_id pci_ids[] __devinitdata = {
143 /* Intel Moorestown platform SPI controller 0 */
144 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) },
145 {},
146};
147
148static struct pci_driver dw_spi_driver = {
149 .name = DRIVER_NAME,
150 .id_table = pci_ids,
151 .probe = spi_pci_probe,
152 .remove = __devexit_p(spi_pci_remove),
153 .suspend = spi_suspend,
154 .resume = spi_resume,
155};
156
157static int __init mrst_spi_init(void)
158{
159 return pci_register_driver(&dw_spi_driver);
160}
161
162static void __exit mrst_spi_exit(void)
163{
164 pci_unregister_driver(&dw_spi_driver);
165}
166
167module_init(mrst_spi_init);
168module_exit(mrst_spi_exit);
169
170MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
171MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
172MODULE_LICENSE("GPL v2");