Commit | Line | Data |
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f7b6fd6d JHD |
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> | |
50c01fc3 | 12 | #include <linux/err.h> |
f7b6fd6d JHD |
13 | #include <linux/interrupt.h> |
14 | #include <linux/platform_device.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
f7b6fd6d | 16 | #include <linux/spi/spi.h> |
568a60ed GL |
17 | #include <linux/scatterlist.h> |
18 | ||
19 | #include "dw_spi.h" | |
f7b6fd6d JHD |
20 | |
21 | #define DRIVER_NAME "dw_spi_mmio" | |
22 | ||
23 | struct dw_spi_mmio { | |
0a4c1d7d JHD |
24 | struct dw_spi dws; |
25 | struct clk *clk; | |
f7b6fd6d JHD |
26 | }; |
27 | ||
28 | static int __devinit dw_spi_mmio_probe(struct platform_device *pdev) | |
29 | { | |
30 | struct dw_spi_mmio *dwsmmio; | |
31 | struct dw_spi *dws; | |
32 | struct resource *mem, *ioarea; | |
33 | int ret; | |
34 | ||
35 | dwsmmio = kzalloc(sizeof(struct dw_spi_mmio), GFP_KERNEL); | |
36 | if (!dwsmmio) { | |
37 | ret = -ENOMEM; | |
38 | goto err_end; | |
39 | } | |
40 | ||
41 | dws = &dwsmmio->dws; | |
42 | ||
43 | /* Get basic io resource and map it */ | |
44 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
45 | if (!mem) { | |
46 | dev_err(&pdev->dev, "no mem resource?\n"); | |
47 | ret = -EINVAL; | |
48 | goto err_kfree; | |
49 | } | |
50 | ||
51 | ioarea = request_mem_region(mem->start, resource_size(mem), | |
52 | pdev->name); | |
53 | if (!ioarea) { | |
54 | dev_err(&pdev->dev, "SPI region already claimed\n"); | |
55 | ret = -EBUSY; | |
56 | goto err_kfree; | |
57 | } | |
58 | ||
59 | dws->regs = ioremap_nocache(mem->start, resource_size(mem)); | |
60 | if (!dws->regs) { | |
61 | dev_err(&pdev->dev, "SPI region already mapped\n"); | |
62 | ret = -ENOMEM; | |
63 | goto err_release_reg; | |
64 | } | |
65 | ||
66 | dws->irq = platform_get_irq(pdev, 0); | |
67 | if (dws->irq < 0) { | |
68 | dev_err(&pdev->dev, "no irq resource?\n"); | |
69 | ret = dws->irq; /* -ENXIO */ | |
70 | goto err_unmap; | |
71 | } | |
72 | ||
73 | dwsmmio->clk = clk_get(&pdev->dev, NULL); | |
50c01fc3 JI |
74 | if (IS_ERR(dwsmmio->clk)) { |
75 | ret = PTR_ERR(dwsmmio->clk); | |
f7b6fd6d JHD |
76 | goto err_irq; |
77 | } | |
78 | clk_enable(dwsmmio->clk); | |
79 | ||
80 | dws->parent_dev = &pdev->dev; | |
81 | dws->bus_num = 0; | |
82 | dws->num_cs = 4; | |
83 | dws->max_freq = clk_get_rate(dwsmmio->clk); | |
84 | ||
85 | ret = dw_spi_add_host(dws); | |
86 | if (ret) | |
87 | goto err_clk; | |
88 | ||
89 | platform_set_drvdata(pdev, dwsmmio); | |
90 | return 0; | |
91 | ||
92 | err_clk: | |
93 | clk_disable(dwsmmio->clk); | |
94 | clk_put(dwsmmio->clk); | |
95 | dwsmmio->clk = NULL; | |
96 | err_irq: | |
97 | free_irq(dws->irq, dws); | |
98 | err_unmap: | |
99 | iounmap(dws->regs); | |
100 | err_release_reg: | |
101 | release_mem_region(mem->start, resource_size(mem)); | |
102 | err_kfree: | |
103 | kfree(dwsmmio); | |
104 | err_end: | |
105 | return ret; | |
106 | } | |
107 | ||
108 | static int __devexit dw_spi_mmio_remove(struct platform_device *pdev) | |
109 | { | |
110 | struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev); | |
111 | struct resource *mem; | |
112 | ||
113 | platform_set_drvdata(pdev, NULL); | |
114 | ||
115 | clk_disable(dwsmmio->clk); | |
116 | clk_put(dwsmmio->clk); | |
117 | dwsmmio->clk = NULL; | |
118 | ||
119 | free_irq(dwsmmio->dws.irq, &dwsmmio->dws); | |
120 | dw_spi_remove_host(&dwsmmio->dws); | |
121 | iounmap(dwsmmio->dws.regs); | |
122 | kfree(dwsmmio); | |
123 | ||
124 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
125 | release_mem_region(mem->start, resource_size(mem)); | |
126 | return 0; | |
127 | } | |
128 | ||
129 | static struct platform_driver dw_spi_mmio_driver = { | |
130 | .remove = __devexit_p(dw_spi_mmio_remove), | |
131 | .driver = { | |
132 | .name = DRIVER_NAME, | |
133 | .owner = THIS_MODULE, | |
134 | }, | |
135 | }; | |
136 | ||
137 | static int __init dw_spi_mmio_init(void) | |
138 | { | |
139 | return platform_driver_probe(&dw_spi_mmio_driver, dw_spi_mmio_probe); | |
140 | } | |
0a4c1d7d | 141 | module_init(dw_spi_mmio_init); |
f7b6fd6d JHD |
142 | |
143 | static void __exit dw_spi_mmio_exit(void) | |
144 | { | |
145 | platform_driver_unregister(&dw_spi_mmio_driver); | |
146 | } | |
f7b6fd6d JHD |
147 | module_exit(dw_spi_mmio_exit); |
148 | ||
149 | MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>"); | |
150 | MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core"); | |
151 | MODULE_LICENSE("GPL v2"); |