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Feng Tange24c7452009-12-14 14:20:22 -08001/*
Feng Tang7063c0d2010-12-24 13:59:11 +08002 * dw_spi_pci.c - PCI interface driver for DW SPI Core
Feng Tange24c7452009-12-14 14:20:22 -08003 *
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 {
Feng Tang7063c0d2010-12-24 13:59:11 +080029 struct pci_dev *pdev;
30 struct dw_spi dws;
Feng Tange24c7452009-12-14 14:20:22 -080031};
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;
Feng Tange24c7452009-12-14 14:20:22 -080075 dws->irq = pdev->irq;
Feng Tang7063c0d2010-12-24 13:59:11 +080076
77 /*
78 * Specific handling for Intel MID paltforms, like dma setup,
79 * clock rate, FIFO depth.
80 */
81 if (pdev->device == 0x0800) {
82 ret = dw_spi_mid_init(dws);
83 if (ret)
84 goto err_unmap;
85 }
Feng Tange24c7452009-12-14 14:20:22 -080086
87 ret = dw_spi_add_host(dws);
88 if (ret)
89 goto err_unmap;
90
91 /* PCI hook and SPI hook use the same drv data */
92 pci_set_drvdata(pdev, dwpci);
93 return 0;
94
95err_unmap:
96 iounmap(dws->regs);
97err_release_reg:
98 pci_release_region(pdev, pci_bar);
99err_kfree:
100 kfree(dwpci);
101err_disable:
102 pci_disable_device(pdev);
103 return ret;
104}
105
106static void __devexit spi_pci_remove(struct pci_dev *pdev)
107{
108 struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
109
110 pci_set_drvdata(pdev, NULL);
Feng Tang51f921c2010-01-20 13:49:45 -0700111 dw_spi_remove_host(&dwpci->dws);
Feng Tange24c7452009-12-14 14:20:22 -0800112 iounmap(dwpci->dws.regs);
113 pci_release_region(pdev, 0);
114 kfree(dwpci);
115 pci_disable_device(pdev);
116}
117
118#ifdef CONFIG_PM
119static int spi_suspend(struct pci_dev *pdev, pm_message_t state)
120{
121 struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
122 int ret;
123
124 ret = dw_spi_suspend_host(&dwpci->dws);
125 if (ret)
126 return ret;
127 pci_save_state(pdev);
128 pci_disable_device(pdev);
129 pci_set_power_state(pdev, pci_choose_state(pdev, state));
130 return ret;
131}
132
133static int spi_resume(struct pci_dev *pdev)
134{
135 struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
136 int ret;
137
138 pci_set_power_state(pdev, PCI_D0);
139 pci_restore_state(pdev);
140 ret = pci_enable_device(pdev);
141 if (ret)
142 return ret;
143 return dw_spi_resume_host(&dwpci->dws);
144}
145#else
146#define spi_suspend NULL
147#define spi_resume NULL
148#endif
149
150static const struct pci_device_id pci_ids[] __devinitdata = {
Feng Tang7063c0d2010-12-24 13:59:11 +0800151 /* Intel MID platform SPI controller 0 */
Feng Tange24c7452009-12-14 14:20:22 -0800152 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) },
153 {},
154};
155
156static struct pci_driver dw_spi_driver = {
157 .name = DRIVER_NAME,
158 .id_table = pci_ids,
159 .probe = spi_pci_probe,
160 .remove = __devexit_p(spi_pci_remove),
161 .suspend = spi_suspend,
162 .resume = spi_resume,
163};
164
165static int __init mrst_spi_init(void)
166{
167 return pci_register_driver(&dw_spi_driver);
168}
169
170static void __exit mrst_spi_exit(void)
171{
172 pci_unregister_driver(&dw_spi_driver);
173}
174
175module_init(mrst_spi_init);
176module_exit(mrst_spi_exit);
177
178MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
179MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
180MODULE_LICENSE("GPL v2");