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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
19#include "spi-dw.h"
20
21#define DRIVER_NAME "dw_spi_mmio"
22
23struct dw_spi_mmio {
24 struct dw_spi dws;
25 struct clk *clk;
26};
27
28static int __devinit dw_spi_mmio_probe(struct platform_device *pdev)
29{
30 struct dw_spi_mmio *dwsmmio;
31 struct dw_spi *dws;
32 struct resource *mem, *ioarea;
33 int ret;
34
35 dwsmmio = kzalloc(sizeof(struct dw_spi_mmio), GFP_KERNEL);
36 if (!dwsmmio) {
37 ret = -ENOMEM;
38 goto err_end;
39 }
40
41 dws = &dwsmmio->dws;
42
43 /* Get basic io resource and map it */
44 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
45 if (!mem) {
46 dev_err(&pdev->dev, "no mem resource?\n");
47 ret = -EINVAL;
48 goto err_kfree;
49 }
50
51 ioarea = request_mem_region(mem->start, resource_size(mem),
52 pdev->name);
53 if (!ioarea) {
54 dev_err(&pdev->dev, "SPI region already claimed\n");
55 ret = -EBUSY;
56 goto err_kfree;
57 }
58
59 dws->regs = ioremap_nocache(mem->start, resource_size(mem));
60 if (!dws->regs) {
61 dev_err(&pdev->dev, "SPI region already mapped\n");
62 ret = -ENOMEM;
63 goto err_release_reg;
64 }
65
66 dws->irq = platform_get_irq(pdev, 0);
67 if (dws->irq < 0) {
68 dev_err(&pdev->dev, "no irq resource?\n");
69 ret = dws->irq; /* -ENXIO */
70 goto err_unmap;
71 }
72
73 dwsmmio->clk = clk_get(&pdev->dev, NULL);
74 if (IS_ERR(dwsmmio->clk)) {
75 ret = PTR_ERR(dwsmmio->clk);
76 goto err_irq;
77 }
78 clk_enable(dwsmmio->clk);
79
80 dws->parent_dev = &pdev->dev;
81 dws->bus_num = 0;
82 dws->num_cs = 4;
83 dws->max_freq = clk_get_rate(dwsmmio->clk);
84
85 ret = dw_spi_add_host(dws);
86 if (ret)
87 goto err_clk;
88
89 platform_set_drvdata(pdev, dwsmmio);
90 return 0;
91
92err_clk:
93 clk_disable(dwsmmio->clk);
94 clk_put(dwsmmio->clk);
95 dwsmmio->clk = NULL;
96err_irq:
97 free_irq(dws->irq, dws);
98err_unmap:
99 iounmap(dws->regs);
100err_release_reg:
101 release_mem_region(mem->start, resource_size(mem));
102err_kfree:
103 kfree(dwsmmio);
104err_end:
105 return ret;
106}
107
108static int __devexit dw_spi_mmio_remove(struct platform_device *pdev)
109{
110 struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
111 struct resource *mem;
112
113 platform_set_drvdata(pdev, NULL);
114
115 clk_disable(dwsmmio->clk);
116 clk_put(dwsmmio->clk);
117 dwsmmio->clk = NULL;
118
119 free_irq(dwsmmio->dws.irq, &dwsmmio->dws);
120 dw_spi_remove_host(&dwsmmio->dws);
121 iounmap(dwsmmio->dws.regs);
122 kfree(dwsmmio);
123
124 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
125 release_mem_region(mem->start, resource_size(mem));
126 return 0;
127}
128
129static struct platform_driver dw_spi_mmio_driver = {
130 .remove = __devexit_p(dw_spi_mmio_remove),
131 .driver = {
132 .name = DRIVER_NAME,
133 .owner = THIS_MODULE,
134 },
135};
136
137static int __init dw_spi_mmio_init(void)
138{
139 return platform_driver_probe(&dw_spi_mmio_driver, dw_spi_mmio_probe);
140}
141module_init(dw_spi_mmio_init);
142
143static void __exit dw_spi_mmio_exit(void)
144{
145 platform_driver_unregister(&dw_spi_mmio_driver);
146}
147module_exit(dw_spi_mmio_exit);
148
149MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>");
150MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core");
151MODULE_LICENSE("GPL v2");
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#include <linux/of.h>
20#include <linux/of_gpio.h>
21#include <linux/of_platform.h>
22#include <linux/property.h>
23
24#include "spi-dw.h"
25
26#define DRIVER_NAME "dw_spi_mmio"
27
28struct dw_spi_mmio {
29 struct dw_spi dws;
30 struct clk *clk;
31};
32
33static int dw_spi_mmio_probe(struct platform_device *pdev)
34{
35 struct dw_spi_mmio *dwsmmio;
36 struct dw_spi *dws;
37 struct resource *mem;
38 int ret;
39 int num_cs;
40
41 dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio),
42 GFP_KERNEL);
43 if (!dwsmmio)
44 return -ENOMEM;
45
46 dws = &dwsmmio->dws;
47
48 /* Get basic io resource and map it */
49 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
50 dws->regs = devm_ioremap_resource(&pdev->dev, mem);
51 if (IS_ERR(dws->regs)) {
52 dev_err(&pdev->dev, "SPI region map failed\n");
53 return PTR_ERR(dws->regs);
54 }
55
56 dws->irq = platform_get_irq(pdev, 0);
57 if (dws->irq < 0) {
58 dev_err(&pdev->dev, "no irq resource?\n");
59 return dws->irq; /* -ENXIO */
60 }
61
62 dwsmmio->clk = devm_clk_get(&pdev->dev, NULL);
63 if (IS_ERR(dwsmmio->clk))
64 return PTR_ERR(dwsmmio->clk);
65 ret = clk_prepare_enable(dwsmmio->clk);
66 if (ret)
67 return ret;
68
69 dws->bus_num = pdev->id;
70
71 dws->max_freq = clk_get_rate(dwsmmio->clk);
72
73 device_property_read_u32(&pdev->dev, "reg-io-width", &dws->reg_io_width);
74
75 num_cs = 4;
76
77 device_property_read_u32(&pdev->dev, "num-cs", &num_cs);
78
79 dws->num_cs = num_cs;
80
81 if (pdev->dev.of_node) {
82 int i;
83
84 for (i = 0; i < dws->num_cs; i++) {
85 int cs_gpio = of_get_named_gpio(pdev->dev.of_node,
86 "cs-gpios", i);
87
88 if (cs_gpio == -EPROBE_DEFER) {
89 ret = cs_gpio;
90 goto out;
91 }
92
93 if (gpio_is_valid(cs_gpio)) {
94 ret = devm_gpio_request(&pdev->dev, cs_gpio,
95 dev_name(&pdev->dev));
96 if (ret)
97 goto out;
98 }
99 }
100 }
101
102 ret = dw_spi_add_host(&pdev->dev, dws);
103 if (ret)
104 goto out;
105
106 platform_set_drvdata(pdev, dwsmmio);
107 return 0;
108
109out:
110 clk_disable_unprepare(dwsmmio->clk);
111 return ret;
112}
113
114static int dw_spi_mmio_remove(struct platform_device *pdev)
115{
116 struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
117
118 clk_disable_unprepare(dwsmmio->clk);
119 dw_spi_remove_host(&dwsmmio->dws);
120
121 return 0;
122}
123
124static const struct of_device_id dw_spi_mmio_of_match[] = {
125 { .compatible = "snps,dw-apb-ssi", },
126 { /* end of table */}
127};
128MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
129
130static 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 .of_match_table = dw_spi_mmio_of_match,
136 },
137};
138module_platform_driver(dw_spi_mmio_driver);
139
140MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>");
141MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core");
142MODULE_LICENSE("GPL v2");