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> |
22dae17e | 19 | #include <linux/of.h> |
d9c73bb8 | 20 | #include <linux/of_gpio.h> |
22dae17e | 21 | #include <linux/of_platform.h> |
568a60ed | 22 | |
ca632f55 | 23 | #include "spi-dw.h" |
f7b6fd6d JHD |
24 | |
25 | #define DRIVER_NAME "dw_spi_mmio" | |
26 | ||
27 | struct dw_spi_mmio { | |
0a4c1d7d JHD |
28 | struct dw_spi dws; |
29 | struct clk *clk; | |
f7b6fd6d JHD |
30 | }; |
31 | ||
fd4a319b | 32 | static int dw_spi_mmio_probe(struct platform_device *pdev) |
f7b6fd6d JHD |
33 | { |
34 | struct dw_spi_mmio *dwsmmio; | |
35 | struct dw_spi *dws; | |
04f421e7 | 36 | struct resource *mem; |
f7b6fd6d | 37 | int ret; |
22dae17e | 38 | int num_cs; |
f7b6fd6d | 39 | |
04f421e7 BS |
40 | dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio), |
41 | GFP_KERNEL); | |
42 | if (!dwsmmio) | |
43 | return -ENOMEM; | |
f7b6fd6d JHD |
44 | |
45 | dws = &dwsmmio->dws; | |
46 | ||
47 | /* Get basic io resource and map it */ | |
48 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
49 | if (!mem) { | |
50 | dev_err(&pdev->dev, "no mem resource?\n"); | |
04f421e7 | 51 | return -EINVAL; |
f7b6fd6d JHD |
52 | } |
53 | ||
04f421e7 BS |
54 | dws->regs = devm_ioremap_resource(&pdev->dev, mem); |
55 | if (IS_ERR(dws->regs)) { | |
56 | dev_err(&pdev->dev, "SPI region map failed\n"); | |
57 | return PTR_ERR(dws->regs); | |
f7b6fd6d JHD |
58 | } |
59 | ||
60 | dws->irq = platform_get_irq(pdev, 0); | |
61 | if (dws->irq < 0) { | |
62 | dev_err(&pdev->dev, "no irq resource?\n"); | |
04f421e7 | 63 | return dws->irq; /* -ENXIO */ |
f7b6fd6d JHD |
64 | } |
65 | ||
04f421e7 BS |
66 | dwsmmio->clk = devm_clk_get(&pdev->dev, NULL); |
67 | if (IS_ERR(dwsmmio->clk)) | |
68 | return PTR_ERR(dwsmmio->clk); | |
020fe3fe | 69 | ret = clk_prepare_enable(dwsmmio->clk); |
04f421e7 BS |
70 | if (ret) |
71 | return ret; | |
f7b6fd6d | 72 | |
2418991e | 73 | dws->bus_num = pdev->id; |
22dae17e | 74 | |
f7b6fd6d JHD |
75 | dws->max_freq = clk_get_rate(dwsmmio->clk); |
76 | ||
22dae17e ST |
77 | num_cs = 4; |
78 | ||
79 | if (pdev->dev.of_node) | |
80 | of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs); | |
81 | ||
82 | dws->num_cs = num_cs; | |
83 | ||
d9c73bb8 BS |
84 | if (pdev->dev.of_node) { |
85 | int i; | |
86 | ||
87 | for (i = 0; i < dws->num_cs; i++) { | |
88 | int cs_gpio = of_get_named_gpio(pdev->dev.of_node, | |
89 | "cs-gpios", i); | |
90 | ||
91 | if (cs_gpio == -EPROBE_DEFER) { | |
92 | ret = cs_gpio; | |
93 | goto out; | |
94 | } | |
95 | ||
96 | if (gpio_is_valid(cs_gpio)) { | |
97 | ret = devm_gpio_request(&pdev->dev, cs_gpio, | |
98 | dev_name(&pdev->dev)); | |
99 | if (ret) | |
100 | goto out; | |
101 | } | |
102 | } | |
103 | } | |
104 | ||
04f421e7 | 105 | ret = dw_spi_add_host(&pdev->dev, dws); |
f7b6fd6d | 106 | if (ret) |
04f421e7 | 107 | goto out; |
f7b6fd6d JHD |
108 | |
109 | platform_set_drvdata(pdev, dwsmmio); | |
110 | return 0; | |
111 | ||
04f421e7 | 112 | out: |
020fe3fe | 113 | clk_disable_unprepare(dwsmmio->clk); |
f7b6fd6d JHD |
114 | return ret; |
115 | } | |
116 | ||
fd4a319b | 117 | static int dw_spi_mmio_remove(struct platform_device *pdev) |
f7b6fd6d JHD |
118 | { |
119 | struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev); | |
f7b6fd6d | 120 | |
020fe3fe | 121 | clk_disable_unprepare(dwsmmio->clk); |
f7b6fd6d | 122 | dw_spi_remove_host(&dwsmmio->dws); |
f7b6fd6d | 123 | |
f7b6fd6d JHD |
124 | return 0; |
125 | } | |
126 | ||
22dae17e ST |
127 | static const struct of_device_id dw_spi_mmio_of_match[] = { |
128 | { .compatible = "snps,dw-apb-ssi", }, | |
129 | { /* end of table */} | |
130 | }; | |
131 | MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match); | |
132 | ||
f7b6fd6d | 133 | static struct platform_driver dw_spi_mmio_driver = { |
940ab889 | 134 | .probe = dw_spi_mmio_probe, |
fd4a319b | 135 | .remove = dw_spi_mmio_remove, |
f7b6fd6d JHD |
136 | .driver = { |
137 | .name = DRIVER_NAME, | |
138 | .owner = THIS_MODULE, | |
22dae17e | 139 | .of_match_table = dw_spi_mmio_of_match, |
f7b6fd6d JHD |
140 | }, |
141 | }; | |
940ab889 | 142 | module_platform_driver(dw_spi_mmio_driver); |
f7b6fd6d JHD |
143 | |
144 | MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>"); | |
145 | MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core"); | |
146 | MODULE_LICENSE("GPL v2"); |