2 * Memory-mapped interface driver for DW SPI Core
4 * Copyright (c) 2010, Octasic semiconductor.
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.
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>
20 #include <linux/of_gpio.h>
21 #include <linux/of_platform.h>
25 #define DRIVER_NAME "dw_spi_mmio"
32 static int dw_spi_mmio_probe(struct platform_device *pdev)
34 struct dw_spi_mmio *dwsmmio;
40 dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio),
47 /* Get basic io resource and map it */
48 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
50 dev_err(&pdev->dev, "no mem resource?\n");
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);
60 dws->irq = platform_get_irq(pdev, 0);
62 dev_err(&pdev->dev, "no irq resource?\n");
63 return dws->irq; /* -ENXIO */
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);
73 dws->bus_num = pdev->id;
75 dws->max_freq = clk_get_rate(dwsmmio->clk);
77 of_property_read_u32(pdev->dev.of_node, "reg-io-width",
82 if (pdev->dev.of_node)
83 of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
87 if (pdev->dev.of_node) {
90 for (i = 0; i < dws->num_cs; i++) {
91 int cs_gpio = of_get_named_gpio(pdev->dev.of_node,
94 if (cs_gpio == -EPROBE_DEFER) {
99 if (gpio_is_valid(cs_gpio)) {
100 ret = devm_gpio_request(&pdev->dev, cs_gpio,
101 dev_name(&pdev->dev));
108 ret = dw_spi_add_host(&pdev->dev, dws);
112 platform_set_drvdata(pdev, dwsmmio);
116 clk_disable_unprepare(dwsmmio->clk);
120 static int dw_spi_mmio_remove(struct platform_device *pdev)
122 struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
124 clk_disable_unprepare(dwsmmio->clk);
125 dw_spi_remove_host(&dwsmmio->dws);
130 static const struct of_device_id dw_spi_mmio_of_match[] = {
131 { .compatible = "snps,dw-apb-ssi", },
132 { /* end of table */}
134 MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
136 static struct platform_driver dw_spi_mmio_driver = {
137 .probe = dw_spi_mmio_probe,
138 .remove = dw_spi_mmio_remove,
141 .of_match_table = dw_spi_mmio_of_match,
144 module_platform_driver(dw_spi_mmio_driver);
146 MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>");
147 MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core");
148 MODULE_LICENSE("GPL v2");