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e24c7452 FT |
1 | /* |
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> | |
22 | #include <linux/spi/dw_spi.h> | |
23 | #include <linux/spi/spi.h> | |
24 | ||
25 | #define DRIVER_NAME "dw_spi_pci" | |
26 | ||
27 | struct dw_spi_pci { | |
28 | struct pci_dev *pdev; | |
29 | struct dw_spi dws; | |
30 | }; | |
31 | ||
32 | static int __devinit spi_pci_probe(struct pci_dev *pdev, | |
33 | const struct pci_device_id *ent) | |
34 | { | |
35 | struct dw_spi_pci *dwpci; | |
36 | struct dw_spi *dws; | |
37 | int pci_bar = 0; | |
38 | int ret; | |
39 | ||
40 | printk(KERN_INFO "DW: found PCI SPI controller(ID: %04x:%04x)\n", | |
41 | pdev->vendor, pdev->device); | |
42 | ||
43 | ret = pci_enable_device(pdev); | |
44 | if (ret) | |
45 | return ret; | |
46 | ||
47 | dwpci = kzalloc(sizeof(struct dw_spi_pci), GFP_KERNEL); | |
48 | if (!dwpci) { | |
49 | ret = -ENOMEM; | |
50 | goto err_disable; | |
51 | } | |
52 | ||
53 | dwpci->pdev = pdev; | |
54 | dws = &dwpci->dws; | |
55 | ||
56 | /* Get basic io resource and map it */ | |
57 | dws->paddr = pci_resource_start(pdev, pci_bar); | |
58 | dws->iolen = pci_resource_len(pdev, pci_bar); | |
59 | ||
60 | ret = pci_request_region(pdev, pci_bar, dev_name(&pdev->dev)); | |
61 | if (ret) | |
62 | goto err_kfree; | |
63 | ||
64 | dws->regs = ioremap_nocache((unsigned long)dws->paddr, | |
65 | pci_resource_len(pdev, pci_bar)); | |
66 | if (!dws->regs) { | |
67 | ret = -ENOMEM; | |
68 | goto err_release_reg; | |
69 | } | |
70 | ||
71 | dws->parent_dev = &pdev->dev; | |
72 | dws->bus_num = 0; | |
73 | dws->num_cs = 4; | |
74 | dws->max_freq = 25000000; /* for Moorestwon */ | |
75 | dws->irq = pdev->irq; | |
76 | ||
77 | ret = dw_spi_add_host(dws); | |
78 | if (ret) | |
79 | goto err_unmap; | |
80 | ||
81 | /* PCI hook and SPI hook use the same drv data */ | |
82 | pci_set_drvdata(pdev, dwpci); | |
83 | return 0; | |
84 | ||
85 | err_unmap: | |
86 | iounmap(dws->regs); | |
87 | err_release_reg: | |
88 | pci_release_region(pdev, pci_bar); | |
89 | err_kfree: | |
90 | kfree(dwpci); | |
91 | err_disable: | |
92 | pci_disable_device(pdev); | |
93 | return ret; | |
94 | } | |
95 | ||
96 | static void __devexit spi_pci_remove(struct pci_dev *pdev) | |
97 | { | |
98 | struct dw_spi_pci *dwpci = pci_get_drvdata(pdev); | |
99 | ||
100 | pci_set_drvdata(pdev, NULL); | |
101 | iounmap(dwpci->dws.regs); | |
102 | pci_release_region(pdev, 0); | |
103 | kfree(dwpci); | |
104 | pci_disable_device(pdev); | |
105 | } | |
106 | ||
107 | #ifdef CONFIG_PM | |
108 | static int spi_suspend(struct pci_dev *pdev, pm_message_t state) | |
109 | { | |
110 | struct dw_spi_pci *dwpci = pci_get_drvdata(pdev); | |
111 | int ret; | |
112 | ||
113 | ret = dw_spi_suspend_host(&dwpci->dws); | |
114 | if (ret) | |
115 | return ret; | |
116 | pci_save_state(pdev); | |
117 | pci_disable_device(pdev); | |
118 | pci_set_power_state(pdev, pci_choose_state(pdev, state)); | |
119 | return ret; | |
120 | } | |
121 | ||
122 | static int spi_resume(struct pci_dev *pdev) | |
123 | { | |
124 | struct dw_spi_pci *dwpci = pci_get_drvdata(pdev); | |
125 | int ret; | |
126 | ||
127 | pci_set_power_state(pdev, PCI_D0); | |
128 | pci_restore_state(pdev); | |
129 | ret = pci_enable_device(pdev); | |
130 | if (ret) | |
131 | return ret; | |
132 | return dw_spi_resume_host(&dwpci->dws); | |
133 | } | |
134 | #else | |
135 | #define spi_suspend NULL | |
136 | #define spi_resume NULL | |
137 | #endif | |
138 | ||
139 | static const struct pci_device_id pci_ids[] __devinitdata = { | |
140 | /* Intel Moorestown platform SPI controller 0 */ | |
141 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) }, | |
142 | {}, | |
143 | }; | |
144 | ||
145 | static struct pci_driver dw_spi_driver = { | |
146 | .name = DRIVER_NAME, | |
147 | .id_table = pci_ids, | |
148 | .probe = spi_pci_probe, | |
149 | .remove = __devexit_p(spi_pci_remove), | |
150 | .suspend = spi_suspend, | |
151 | .resume = spi_resume, | |
152 | }; | |
153 | ||
154 | static int __init mrst_spi_init(void) | |
155 | { | |
156 | return pci_register_driver(&dw_spi_driver); | |
157 | } | |
158 | ||
159 | static void __exit mrst_spi_exit(void) | |
160 | { | |
161 | pci_unregister_driver(&dw_spi_driver); | |
162 | } | |
163 | ||
164 | module_init(mrst_spi_init); | |
165 | module_exit(mrst_spi_exit); | |
166 | ||
167 | MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>"); | |
168 | MODULE_DESCRIPTION("PCI interface driver for DW SPI Core"); | |
169 | MODULE_LICENSE("GPL v2"); |