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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
23#include "spi-dw.h"
24
25#define DRIVER_NAME "dw_spi_mmio"
26
27struct dw_spi_mmio {
28 struct dw_spi dws;
29 struct clk *clk;
30};
31
32static int dw_spi_mmio_probe(struct platform_device *pdev)
33{
34 struct dw_spi_mmio *dwsmmio;
35 struct dw_spi *dws;
36 struct resource *mem;
37 int ret;
38 int num_cs;
39
40 dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio),
41 GFP_KERNEL);
42 if (!dwsmmio)
43 return -ENOMEM;
44
45 dws = &dwsmmio->dws;
46
47
48 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
49 if (!mem) {
50 dev_err(&pdev->dev, "no mem resource?\n");
51 return -EINVAL;
52 }
53
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);
58 }
59
60 dws->irq = platform_get_irq(pdev, 0);
61 if (dws->irq < 0) {
62 dev_err(&pdev->dev, "no irq resource?\n");
63 return dws->irq;
64 }
65
66 dwsmmio->clk = devm_clk_get(&pdev->dev, NULL);
67 if (IS_ERR(dwsmmio->clk))
68 return PTR_ERR(dwsmmio->clk);
69 ret = clk_prepare_enable(dwsmmio->clk);
70 if (ret)
71 return ret;
72
73 dws->bus_num = pdev->id;
74
75 dws->max_freq = clk_get_rate(dwsmmio->clk);
76
77 of_property_read_u32(pdev->dev.of_node, "reg-io-width",
78 &dws->reg_io_width);
79
80 num_cs = 4;
81
82 if (pdev->dev.of_node)
83 of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
84
85 dws->num_cs = num_cs;
86
87 if (pdev->dev.of_node) {
88 int i;
89
90 for (i = 0; i < dws->num_cs; i++) {
91 int cs_gpio = of_get_named_gpio(pdev->dev.of_node,
92 "cs-gpios", i);
93
94 if (cs_gpio == -EPROBE_DEFER) {
95 ret = cs_gpio;
96 goto out;
97 }
98
99 if (gpio_is_valid(cs_gpio)) {
100 ret = devm_gpio_request(&pdev->dev, cs_gpio,
101 dev_name(&pdev->dev));
102 if (ret)
103 goto out;
104 }
105 }
106 }
107
108 ret = dw_spi_add_host(&pdev->dev, dws);
109 if (ret)
110 goto out;
111
112 platform_set_drvdata(pdev, dwsmmio);
113 return 0;
114
115out:
116 clk_disable_unprepare(dwsmmio->clk);
117 return ret;
118}
119
120static int dw_spi_mmio_remove(struct platform_device *pdev)
121{
122 struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
123
124 clk_disable_unprepare(dwsmmio->clk);
125 dw_spi_remove_host(&dwsmmio->dws);
126
127 return 0;
128}
129
130static const struct of_device_id dw_spi_mmio_of_match[] = {
131 { .compatible = "snps,dw-apb-ssi", },
132 { }
133};
134MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
135
136static struct platform_driver dw_spi_mmio_driver = {
137 .probe = dw_spi_mmio_probe,
138 .remove = dw_spi_mmio_remove,
139 .driver = {
140 .name = DRIVER_NAME,
141 .of_match_table = dw_spi_mmio_of_match,
142 },
143};
144module_platform_driver(dw_spi_mmio_driver);
145
146MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>");
147MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core");
148MODULE_LICENSE("GPL v2");
149