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1 | /* |
2 | * 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/spi.h> |
17 | #include <linux/scatterlist.h> |
18 | #include <linux/module.h> |
19 | |
20 | #include "spi-dw.h" |
21 | |
22 | #define DRIVER_NAME "dw_spi_mmio" |
23 | |
24 | struct dw_spi_mmio { |
25 | struct dw_spi dws; |
26 | struct clk *clk; |
27 | }; |
28 | |
29 | static int dw_spi_mmio_probe(struct platform_device *pdev) |
30 | { |
31 | struct dw_spi_mmio *dwsmmio; |
32 | struct dw_spi *dws; |
33 | struct resource *mem, *ioarea; |
34 | int ret; |
35 | |
36 | dwsmmio = kzalloc(sizeof(struct dw_spi_mmio), GFP_KERNEL); |
37 | if (!dwsmmio) { |
38 | ret = -ENOMEM; |
39 | goto err_end; |
40 | } |
41 | |
42 | dws = &dwsmmio->dws; |
43 | |
44 | /* Get basic io resource and map it */ |
45 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
46 | if (!mem) { |
47 | dev_err(&pdev->dev, "no mem resource?\n"); |
48 | ret = -EINVAL; |
49 | goto err_kfree; |
50 | } |
51 | |
52 | ioarea = request_mem_region(mem->start, resource_size(mem), |
53 | pdev->name); |
54 | if (!ioarea) { |
55 | dev_err(&pdev->dev, "SPI region already claimed\n"); |
56 | ret = -EBUSY; |
57 | goto err_kfree; |
58 | } |
59 | |
60 | dws->regs = ioremap_nocache(mem->start, resource_size(mem)); |
61 | if (!dws->regs) { |
62 | dev_err(&pdev->dev, "SPI region already mapped\n"); |
63 | ret = -ENOMEM; |
64 | goto err_release_reg; |
65 | } |
66 | |
67 | dws->irq = platform_get_irq(pdev, 0); |
68 | if (dws->irq < 0) { |
69 | dev_err(&pdev->dev, "no irq resource?\n"); |
70 | ret = dws->irq; /* -ENXIO */ |
71 | goto err_unmap; |
72 | } |
73 | |
74 | dwsmmio->clk = clk_get(&pdev->dev, NULL); |
75 | if (IS_ERR(dwsmmio->clk)) { |
76 | ret = PTR_ERR(dwsmmio->clk); |
77 | goto err_irq; |
78 | } |
79 | clk_enable(dwsmmio->clk); |
80 | |
81 | dws->parent_dev = &pdev->dev; |
82 | dws->bus_num = 0; |
83 | dws->num_cs = 4; |
84 | dws->max_freq = clk_get_rate(dwsmmio->clk); |
85 | |
86 | ret = dw_spi_add_host(dws); |
87 | if (ret) |
88 | goto err_clk; |
89 | |
90 | platform_set_drvdata(pdev, dwsmmio); |
91 | return 0; |
92 | |
93 | err_clk: |
94 | clk_disable(dwsmmio->clk); |
95 | clk_put(dwsmmio->clk); |
96 | dwsmmio->clk = NULL; |
97 | err_irq: |
98 | free_irq(dws->irq, dws); |
99 | err_unmap: |
100 | iounmap(dws->regs); |
101 | err_release_reg: |
102 | release_mem_region(mem->start, resource_size(mem)); |
103 | err_kfree: |
104 | kfree(dwsmmio); |
105 | err_end: |
106 | return ret; |
107 | } |
108 | |
109 | static int dw_spi_mmio_remove(struct platform_device *pdev) |
110 | { |
111 | struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev); |
112 | struct resource *mem; |
113 | |
114 | platform_set_drvdata(pdev, NULL); |
115 | |
116 | clk_disable(dwsmmio->clk); |
117 | clk_put(dwsmmio->clk); |
118 | dwsmmio->clk = NULL; |
119 | |
120 | free_irq(dwsmmio->dws.irq, &dwsmmio->dws); |
121 | dw_spi_remove_host(&dwsmmio->dws); |
122 | iounmap(dwsmmio->dws.regs); |
123 | kfree(dwsmmio); |
124 | |
125 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
126 | release_mem_region(mem->start, resource_size(mem)); |
127 | return 0; |
128 | } |
129 | |
130 | static struct platform_driver dw_spi_mmio_driver = { |
131 | .probe = dw_spi_mmio_probe, |
132 | .remove = dw_spi_mmio_remove, |
133 | .driver = { |
134 | .name = DRIVER_NAME, |
135 | .owner = THIS_MODULE, |
136 | }, |
137 | }; |
138 | module_platform_driver(dw_spi_mmio_driver); |
139 | |
140 | MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>"); |
141 | MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core"); |
142 | MODULE_LICENSE("GPL v2"); |
143 |
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Tags:
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