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> |
9899995e | 22 | #include <linux/property.h> |
568a60ed | 23 | |
ca632f55 | 24 | #include "spi-dw.h" |
f7b6fd6d JHD |
25 | |
26 | #define DRIVER_NAME "dw_spi_mmio" | |
27 | ||
28 | struct dw_spi_mmio { | |
0a4c1d7d JHD |
29 | struct dw_spi dws; |
30 | struct clk *clk; | |
f7b6fd6d JHD |
31 | }; |
32 | ||
fd4a319b | 33 | static int dw_spi_mmio_probe(struct platform_device *pdev) |
f7b6fd6d JHD |
34 | { |
35 | struct dw_spi_mmio *dwsmmio; | |
36 | struct dw_spi *dws; | |
04f421e7 | 37 | struct resource *mem; |
f7b6fd6d | 38 | int ret; |
22dae17e | 39 | int num_cs; |
f7b6fd6d | 40 | |
04f421e7 BS |
41 | dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio), |
42 | GFP_KERNEL); | |
43 | if (!dwsmmio) | |
44 | return -ENOMEM; | |
f7b6fd6d JHD |
45 | |
46 | dws = &dwsmmio->dws; | |
47 | ||
48 | /* Get basic io resource and map it */ | |
49 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
50 | if (!mem) { | |
51 | dev_err(&pdev->dev, "no mem resource?\n"); | |
04f421e7 | 52 | return -EINVAL; |
f7b6fd6d JHD |
53 | } |
54 | ||
04f421e7 BS |
55 | dws->regs = devm_ioremap_resource(&pdev->dev, mem); |
56 | if (IS_ERR(dws->regs)) { | |
57 | dev_err(&pdev->dev, "SPI region map failed\n"); | |
58 | return PTR_ERR(dws->regs); | |
f7b6fd6d JHD |
59 | } |
60 | ||
61 | dws->irq = platform_get_irq(pdev, 0); | |
62 | if (dws->irq < 0) { | |
63 | dev_err(&pdev->dev, "no irq resource?\n"); | |
04f421e7 | 64 | return dws->irq; /* -ENXIO */ |
f7b6fd6d JHD |
65 | } |
66 | ||
04f421e7 BS |
67 | dwsmmio->clk = devm_clk_get(&pdev->dev, NULL); |
68 | if (IS_ERR(dwsmmio->clk)) | |
69 | return PTR_ERR(dwsmmio->clk); | |
020fe3fe | 70 | ret = clk_prepare_enable(dwsmmio->clk); |
04f421e7 BS |
71 | if (ret) |
72 | return ret; | |
f7b6fd6d | 73 | |
2418991e | 74 | dws->bus_num = pdev->id; |
22dae17e | 75 | |
f7b6fd6d JHD |
76 | dws->max_freq = clk_get_rate(dwsmmio->clk); |
77 | ||
9899995e | 78 | device_property_read_u32(&pdev->dev, "reg-io-width", &dws->reg_io_width); |
c4fe57f7 | 79 | |
22dae17e ST |
80 | num_cs = 4; |
81 | ||
9899995e | 82 | device_property_read_u32(&pdev->dev, "num-cs", &num_cs); |
22dae17e ST |
83 | |
84 | dws->num_cs = num_cs; | |
85 | ||
d9c73bb8 BS |
86 | if (pdev->dev.of_node) { |
87 | int i; | |
88 | ||
89 | for (i = 0; i < dws->num_cs; i++) { | |
90 | int cs_gpio = of_get_named_gpio(pdev->dev.of_node, | |
91 | "cs-gpios", i); | |
92 | ||
93 | if (cs_gpio == -EPROBE_DEFER) { | |
94 | ret = cs_gpio; | |
95 | goto out; | |
96 | } | |
97 | ||
98 | if (gpio_is_valid(cs_gpio)) { | |
99 | ret = devm_gpio_request(&pdev->dev, cs_gpio, | |
100 | dev_name(&pdev->dev)); | |
101 | if (ret) | |
102 | goto out; | |
103 | } | |
104 | } | |
105 | } | |
106 | ||
04f421e7 | 107 | ret = dw_spi_add_host(&pdev->dev, dws); |
f7b6fd6d | 108 | if (ret) |
04f421e7 | 109 | goto out; |
f7b6fd6d JHD |
110 | |
111 | platform_set_drvdata(pdev, dwsmmio); | |
112 | return 0; | |
113 | ||
04f421e7 | 114 | out: |
020fe3fe | 115 | clk_disable_unprepare(dwsmmio->clk); |
f7b6fd6d JHD |
116 | return ret; |
117 | } | |
118 | ||
fd4a319b | 119 | static int dw_spi_mmio_remove(struct platform_device *pdev) |
f7b6fd6d JHD |
120 | { |
121 | struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev); | |
f7b6fd6d | 122 | |
020fe3fe | 123 | clk_disable_unprepare(dwsmmio->clk); |
f7b6fd6d | 124 | dw_spi_remove_host(&dwsmmio->dws); |
f7b6fd6d | 125 | |
f7b6fd6d JHD |
126 | return 0; |
127 | } | |
128 | ||
22dae17e ST |
129 | static const struct of_device_id dw_spi_mmio_of_match[] = { |
130 | { .compatible = "snps,dw-apb-ssi", }, | |
131 | { /* end of table */} | |
132 | }; | |
133 | MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match); | |
134 | ||
f7b6fd6d | 135 | static struct platform_driver dw_spi_mmio_driver = { |
940ab889 | 136 | .probe = dw_spi_mmio_probe, |
fd4a319b | 137 | .remove = dw_spi_mmio_remove, |
f7b6fd6d JHD |
138 | .driver = { |
139 | .name = DRIVER_NAME, | |
22dae17e | 140 | .of_match_table = dw_spi_mmio_of_match, |
f7b6fd6d JHD |
141 | }, |
142 | }; | |
940ab889 | 143 | module_platform_driver(dw_spi_mmio_driver); |
f7b6fd6d JHD |
144 | |
145 | MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>"); | |
146 | MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core"); | |
147 | MODULE_LICENSE("GPL v2"); |