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Source at commit 6c17a31f1fc515425221067cb3ece599c09dbc5d created 12 years 8 months ago. By Werner Almesberger, atusb, atben: moved from spi/ to ieee802154/; renamed atusb to spi_atusb | |
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1 | /* |
2 | * dw_spi_mmio.c - Memory-mapped interface driver for DW SPI Core |
3 | * |
4 | * Copyright (c) 2010, Octasic semiconductor. |
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 | |
11 | #include <linux/clk.h> |
12 | #include <linux/err.h> |
13 | #include <linux/interrupt.h> |
14 | #include <linux/platform_device.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/spi/dw_spi.h> |
17 | #include <linux/spi/spi.h> |
18 | |
19 | #define DRIVER_NAME "dw_spi_mmio" |
20 | |
21 | struct dw_spi_mmio { |
22 | struct dw_spi dws; |
23 | struct clk *clk; |
24 | }; |
25 | |
26 | static int __devinit dw_spi_mmio_probe(struct platform_device *pdev) |
27 | { |
28 | struct dw_spi_mmio *dwsmmio; |
29 | struct dw_spi *dws; |
30 | struct resource *mem, *ioarea; |
31 | int ret; |
32 | |
33 | dwsmmio = kzalloc(sizeof(struct dw_spi_mmio), GFP_KERNEL); |
34 | if (!dwsmmio) { |
35 | ret = -ENOMEM; |
36 | goto err_end; |
37 | } |
38 | |
39 | dws = &dwsmmio->dws; |
40 | |
41 | /* Get basic io resource and map it */ |
42 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
43 | if (!mem) { |
44 | dev_err(&pdev->dev, "no mem resource?\n"); |
45 | ret = -EINVAL; |
46 | goto err_kfree; |
47 | } |
48 | |
49 | ioarea = request_mem_region(mem->start, resource_size(mem), |
50 | pdev->name); |
51 | if (!ioarea) { |
52 | dev_err(&pdev->dev, "SPI region already claimed\n"); |
53 | ret = -EBUSY; |
54 | goto err_kfree; |
55 | } |
56 | |
57 | dws->regs = ioremap_nocache(mem->start, resource_size(mem)); |
58 | if (!dws->regs) { |
59 | dev_err(&pdev->dev, "SPI region already mapped\n"); |
60 | ret = -ENOMEM; |
61 | goto err_release_reg; |
62 | } |
63 | |
64 | dws->irq = platform_get_irq(pdev, 0); |
65 | if (dws->irq < 0) { |
66 | dev_err(&pdev->dev, "no irq resource?\n"); |
67 | ret = dws->irq; /* -ENXIO */ |
68 | goto err_unmap; |
69 | } |
70 | |
71 | dwsmmio->clk = clk_get(&pdev->dev, NULL); |
72 | if (IS_ERR(dwsmmio->clk)) { |
73 | ret = PTR_ERR(dwsmmio->clk); |
74 | goto err_irq; |
75 | } |
76 | clk_enable(dwsmmio->clk); |
77 | |
78 | dws->parent_dev = &pdev->dev; |
79 | dws->bus_num = 0; |
80 | dws->num_cs = 4; |
81 | dws->max_freq = clk_get_rate(dwsmmio->clk); |
82 | |
83 | ret = dw_spi_add_host(dws); |
84 | if (ret) |
85 | goto err_clk; |
86 | |
87 | platform_set_drvdata(pdev, dwsmmio); |
88 | return 0; |
89 | |
90 | err_clk: |
91 | clk_disable(dwsmmio->clk); |
92 | clk_put(dwsmmio->clk); |
93 | dwsmmio->clk = NULL; |
94 | err_irq: |
95 | free_irq(dws->irq, dws); |
96 | err_unmap: |
97 | iounmap(dws->regs); |
98 | err_release_reg: |
99 | release_mem_region(mem->start, resource_size(mem)); |
100 | err_kfree: |
101 | kfree(dwsmmio); |
102 | err_end: |
103 | return ret; |
104 | } |
105 | |
106 | static int __devexit dw_spi_mmio_remove(struct platform_device *pdev) |
107 | { |
108 | struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev); |
109 | struct resource *mem; |
110 | |
111 | platform_set_drvdata(pdev, NULL); |
112 | |
113 | clk_disable(dwsmmio->clk); |
114 | clk_put(dwsmmio->clk); |
115 | dwsmmio->clk = NULL; |
116 | |
117 | free_irq(dwsmmio->dws.irq, &dwsmmio->dws); |
118 | dw_spi_remove_host(&dwsmmio->dws); |
119 | iounmap(dwsmmio->dws.regs); |
120 | kfree(dwsmmio); |
121 | |
122 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
123 | release_mem_region(mem->start, resource_size(mem)); |
124 | return 0; |
125 | } |
126 | |
127 | static struct platform_driver dw_spi_mmio_driver = { |
128 | .remove = __devexit_p(dw_spi_mmio_remove), |
129 | .driver = { |
130 | .name = DRIVER_NAME, |
131 | .owner = THIS_MODULE, |
132 | }, |
133 | }; |
134 | |
135 | static int __init dw_spi_mmio_init(void) |
136 | { |
137 | return platform_driver_probe(&dw_spi_mmio_driver, dw_spi_mmio_probe); |
138 | } |
139 | module_init(dw_spi_mmio_init); |
140 | |
141 | static void __exit dw_spi_mmio_exit(void) |
142 | { |
143 | platform_driver_unregister(&dw_spi_mmio_driver); |
144 | } |
145 | module_exit(dw_spi_mmio_exit); |
146 | |
147 | MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>"); |
148 | MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core"); |
149 | MODULE_LICENSE("GPL v2"); |
150 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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