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>
22 #define DRIVER_NAME "dw_spi_mmio"
29 static int dw_spi_mmio_probe(struct platform_device *pdev)
31 struct dw_spi_mmio *dwsmmio;
33 struct resource *mem, *ioarea;
36 dwsmmio = kzalloc(sizeof(struct dw_spi_mmio), GFP_KERNEL);
44 /* Get basic io resource and map it */
45 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
47 dev_err(&pdev->dev, "no mem resource?\n");
52 ioarea = request_mem_region(mem->start, resource_size(mem),
55 dev_err(&pdev->dev, "SPI region already claimed\n");
60 dws->regs = ioremap_nocache(mem->start, resource_size(mem));
62 dev_err(&pdev->dev, "SPI region already mapped\n");
67 dws->irq = platform_get_irq(pdev, 0);
69 dev_err(&pdev->dev, "no irq resource?\n");
70 ret = dws->irq; /* -ENXIO */
74 dwsmmio->clk = clk_get(&pdev->dev, NULL);
75 if (IS_ERR(dwsmmio->clk)) {
76 ret = PTR_ERR(dwsmmio->clk);
79 clk_enable(dwsmmio->clk);
81 dws->parent_dev = &pdev->dev;
84 dws->max_freq = clk_get_rate(dwsmmio->clk);
86 ret = dw_spi_add_host(dws);
90 platform_set_drvdata(pdev, dwsmmio);
94 clk_disable(dwsmmio->clk);
95 clk_put(dwsmmio->clk);
98 free_irq(dws->irq, dws);
102 release_mem_region(mem->start, resource_size(mem));
109 static int dw_spi_mmio_remove(struct platform_device *pdev)
111 struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
112 struct resource *mem;
114 clk_disable(dwsmmio->clk);
115 clk_put(dwsmmio->clk);
118 free_irq(dwsmmio->dws.irq, &dwsmmio->dws);
119 dw_spi_remove_host(&dwsmmio->dws);
120 iounmap(dwsmmio->dws.regs);
123 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
124 release_mem_region(mem->start, resource_size(mem));
128 static struct platform_driver dw_spi_mmio_driver = {
129 .probe = dw_spi_mmio_probe,
130 .remove = dw_spi_mmio_remove,
133 .owner = THIS_MODULE,
136 module_platform_driver(dw_spi_mmio_driver);
138 MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>");
139 MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core");
140 MODULE_LICENSE("GPL v2");