Commit | Line | Data |
---|---|---|
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> |
d9c73bb8 | 19 | #include <linux/of_gpio.h> |
568a60ed | 20 | |
ca632f55 | 21 | #include "spi-dw.h" |
f7b6fd6d JHD |
22 | |
23 | #define DRIVER_NAME "dw_spi_mmio" | |
24 | ||
25 | struct dw_spi_mmio { | |
0a4c1d7d JHD |
26 | struct dw_spi dws; |
27 | struct clk *clk; | |
f7b6fd6d JHD |
28 | }; |
29 | ||
fd4a319b | 30 | static int dw_spi_mmio_probe(struct platform_device *pdev) |
f7b6fd6d JHD |
31 | { |
32 | struct dw_spi_mmio *dwsmmio; | |
33 | struct dw_spi *dws; | |
04f421e7 | 34 | struct resource *mem; |
f7b6fd6d JHD |
35 | int ret; |
36 | ||
04f421e7 BS |
37 | dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio), |
38 | GFP_KERNEL); | |
39 | if (!dwsmmio) | |
40 | return -ENOMEM; | |
f7b6fd6d JHD |
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"); | |
04f421e7 | 48 | return -EINVAL; |
f7b6fd6d JHD |
49 | } |
50 | ||
04f421e7 BS |
51 | dws->regs = devm_ioremap_resource(&pdev->dev, mem); |
52 | if (IS_ERR(dws->regs)) { | |
53 | dev_err(&pdev->dev, "SPI region map failed\n"); | |
54 | return PTR_ERR(dws->regs); | |
f7b6fd6d JHD |
55 | } |
56 | ||
57 | dws->irq = platform_get_irq(pdev, 0); | |
58 | if (dws->irq < 0) { | |
59 | dev_err(&pdev->dev, "no irq resource?\n"); | |
04f421e7 | 60 | return dws->irq; /* -ENXIO */ |
f7b6fd6d JHD |
61 | } |
62 | ||
04f421e7 BS |
63 | dwsmmio->clk = devm_clk_get(&pdev->dev, NULL); |
64 | if (IS_ERR(dwsmmio->clk)) | |
65 | return PTR_ERR(dwsmmio->clk); | |
020fe3fe | 66 | ret = clk_prepare_enable(dwsmmio->clk); |
04f421e7 BS |
67 | if (ret) |
68 | return ret; | |
f7b6fd6d | 69 | |
2418991e | 70 | dws->bus_num = pdev->id; |
f7b6fd6d JHD |
71 | dws->num_cs = 4; |
72 | dws->max_freq = clk_get_rate(dwsmmio->clk); | |
73 | ||
d9c73bb8 BS |
74 | if (pdev->dev.of_node) { |
75 | int i; | |
76 | ||
77 | for (i = 0; i < dws->num_cs; i++) { | |
78 | int cs_gpio = of_get_named_gpio(pdev->dev.of_node, | |
79 | "cs-gpios", i); | |
80 | ||
81 | if (cs_gpio == -EPROBE_DEFER) { | |
82 | ret = cs_gpio; | |
83 | goto out; | |
84 | } | |
85 | ||
86 | if (gpio_is_valid(cs_gpio)) { | |
87 | ret = devm_gpio_request(&pdev->dev, cs_gpio, | |
88 | dev_name(&pdev->dev)); | |
89 | if (ret) | |
90 | goto out; | |
91 | } | |
92 | } | |
93 | } | |
94 | ||
04f421e7 | 95 | ret = dw_spi_add_host(&pdev->dev, dws); |
f7b6fd6d | 96 | if (ret) |
04f421e7 | 97 | goto out; |
f7b6fd6d JHD |
98 | |
99 | platform_set_drvdata(pdev, dwsmmio); | |
100 | return 0; | |
101 | ||
04f421e7 | 102 | out: |
020fe3fe | 103 | clk_disable_unprepare(dwsmmio->clk); |
f7b6fd6d JHD |
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); | |
f7b6fd6d | 110 | |
020fe3fe | 111 | clk_disable_unprepare(dwsmmio->clk); |
f7b6fd6d | 112 | dw_spi_remove_host(&dwsmmio->dws); |
f7b6fd6d | 113 | |
f7b6fd6d JHD |
114 | return 0; |
115 | } | |
116 | ||
117 | static struct platform_driver dw_spi_mmio_driver = { | |
940ab889 | 118 | .probe = dw_spi_mmio_probe, |
fd4a319b | 119 | .remove = dw_spi_mmio_remove, |
f7b6fd6d JHD |
120 | .driver = { |
121 | .name = DRIVER_NAME, | |
122 | .owner = THIS_MODULE, | |
123 | }, | |
124 | }; | |
940ab889 | 125 | module_platform_driver(dw_spi_mmio_driver); |
f7b6fd6d JHD |
126 | |
127 | MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>"); | |
128 | MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core"); | |
129 | MODULE_LICENSE("GPL v2"); |