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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> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
e24c7452 FT |
23 | #include <linux/spi/dw_spi.h> |
24 | #include <linux/spi/spi.h> | |
25 | ||
26 | #define DRIVER_NAME "dw_spi_pci" | |
27 | ||
28 | struct dw_spi_pci { | |
29 | struct pci_dev *pdev; | |
30 | struct dw_spi dws; | |
31 | }; | |
32 | ||
33 | static 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; | |
552e4509 | 77 | dws->fifo_len = 40; /* FIFO has 40 words buffer */ |
e24c7452 FT |
78 | |
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 | ||
87 | err_unmap: | |
88 | iounmap(dws->regs); | |
89 | err_release_reg: | |
90 | pci_release_region(pdev, pci_bar); | |
91 | err_kfree: | |
92 | kfree(dwpci); | |
93 | err_disable: | |
94 | pci_disable_device(pdev); | |
95 | return ret; | |
96 | } | |
97 | ||
98 | static 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); | |
51f921c1 | 103 | dw_spi_remove_host(&dwpci->dws); |
e24c7452 FT |
104 | iounmap(dwpci->dws.regs); |
105 | pci_release_region(pdev, 0); | |
106 | kfree(dwpci); | |
107 | pci_disable_device(pdev); | |
108 | } | |
109 | ||
110 | #ifdef CONFIG_PM | |
111 | static 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 | ||
125 | static 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 | ||
142 | static 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 | ||
148 | static 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 | ||
157 | static int __init mrst_spi_init(void) | |
158 | { | |
159 | return pci_register_driver(&dw_spi_driver); | |
160 | } | |
161 | ||
162 | static void __exit mrst_spi_exit(void) | |
163 | { | |
164 | pci_unregister_driver(&dw_spi_driver); | |
165 | } | |
166 | ||
167 | module_init(mrst_spi_init); | |
168 | module_exit(mrst_spi_exit); | |
169 | ||
170 | MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>"); | |
171 | MODULE_DESCRIPTION("PCI interface driver for DW SPI Core"); | |
172 | MODULE_LICENSE("GPL v2"); |