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Commit | Line | Data |
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f7b6fd6d | 1 | /* |
ca632f55 | 2 | * Memory-mapped interface driver for DW SPI Core |
f7b6fd6d JHD |
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 | 17 | #include <linux/scatterlist.h> |
d7614de4 | 18 | #include <linux/module.h> |
568a60ed | 19 | |
ca632f55 | 20 | #include "spi-dw.h" |
f7b6fd6d JHD |
21 | |
22 | #define DRIVER_NAME "dw_spi_mmio" | |
23 | ||
24 | struct dw_spi_mmio { | |
0a4c1d7d JHD |
25 | struct dw_spi dws; |
26 | struct clk *clk; | |
f7b6fd6d JHD |
27 | }; |
28 | ||
fd4a319b | 29 | static int dw_spi_mmio_probe(struct platform_device *pdev) |
f7b6fd6d JHD |
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); | |
50c01fc3 JI |
75 | if (IS_ERR(dwsmmio->clk)) { |
76 | ret = PTR_ERR(dwsmmio->clk); | |
1e0d191f | 77 | goto err_unmap; |
f7b6fd6d JHD |
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; | |
f7b6fd6d JHD |
97 | err_unmap: |
98 | iounmap(dws->regs); | |
99 | err_release_reg: | |
100 | release_mem_region(mem->start, resource_size(mem)); | |
101 | err_kfree: | |
102 | kfree(dwsmmio); | |
103 | err_end: | |
104 | return ret; | |
105 | } | |
106 | ||
fd4a319b | 107 | static int dw_spi_mmio_remove(struct platform_device *pdev) |
f7b6fd6d JHD |
108 | { |
109 | struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev); | |
110 | struct resource *mem; | |
111 | ||
f7b6fd6d JHD |
112 | clk_disable(dwsmmio->clk); |
113 | clk_put(dwsmmio->clk); | |
114 | dwsmmio->clk = NULL; | |
115 | ||
f7b6fd6d JHD |
116 | dw_spi_remove_host(&dwsmmio->dws); |
117 | iounmap(dwsmmio->dws.regs); | |
118 | kfree(dwsmmio); | |
119 | ||
120 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
121 | release_mem_region(mem->start, resource_size(mem)); | |
122 | return 0; | |
123 | } | |
124 | ||
125 | static struct platform_driver dw_spi_mmio_driver = { | |
940ab889 | 126 | .probe = dw_spi_mmio_probe, |
fd4a319b | 127 | .remove = dw_spi_mmio_remove, |
f7b6fd6d JHD |
128 | .driver = { |
129 | .name = DRIVER_NAME, | |
130 | .owner = THIS_MODULE, | |
131 | }, | |
132 | }; | |
940ab889 | 133 | module_platform_driver(dw_spi_mmio_driver); |
f7b6fd6d JHD |
134 | |
135 | MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>"); | |
136 | MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core"); | |
137 | MODULE_LICENSE("GPL v2"); |