2 * dw_spi_mmio.c - 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/interrupt.h>
13 #include <linux/platform_device.h>
14 #include <linux/spi/dw_spi.h>
15 #include <linux/spi/spi.h>
17 #define DRIVER_NAME "dw_spi_mmio"
24 static int __devinit dw_spi_mmio_probe(struct platform_device *pdev)
26 struct dw_spi_mmio *dwsmmio;
28 struct resource *mem, *ioarea;
31 dwsmmio = kzalloc(sizeof(struct dw_spi_mmio), GFP_KERNEL);
39 /* Get basic io resource and map it */
40 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
42 dev_err(&pdev->dev, "no mem resource?\n");
47 ioarea = request_mem_region(mem->start, resource_size(mem),
50 dev_err(&pdev->dev, "SPI region already claimed\n");
55 dws->regs = ioremap_nocache(mem->start, resource_size(mem));
57 dev_err(&pdev->dev, "SPI region already mapped\n");
62 dws->irq = platform_get_irq(pdev, 0);
64 dev_err(&pdev->dev, "no irq resource?\n");
65 ret = dws->irq; /* -ENXIO */
69 dwsmmio->clk = clk_get(&pdev->dev, NULL);
74 clk_enable(dwsmmio->clk);
76 dws->parent_dev = &pdev->dev;
79 dws->max_freq = clk_get_rate(dwsmmio->clk);
81 ret = dw_spi_add_host(dws);
85 platform_set_drvdata(pdev, dwsmmio);
89 clk_disable(dwsmmio->clk);
90 clk_put(dwsmmio->clk);
93 free_irq(dws->irq, dws);
97 release_mem_region(mem->start, resource_size(mem));
104 static int __devexit dw_spi_mmio_remove(struct platform_device *pdev)
106 struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
107 struct resource *mem;
109 platform_set_drvdata(pdev, NULL);
111 clk_disable(dwsmmio->clk);
112 clk_put(dwsmmio->clk);
115 free_irq(dwsmmio->dws.irq, &dwsmmio->dws);
116 dw_spi_remove_host(&dwsmmio->dws);
117 iounmap(dwsmmio->dws.regs);
120 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
121 release_mem_region(mem->start, resource_size(mem));
125 static struct platform_driver dw_spi_mmio_driver = {
126 .remove = __devexit_p(dw_spi_mmio_remove),
129 .owner = THIS_MODULE,
133 static int __init dw_spi_mmio_init(void)
135 return platform_driver_probe(&dw_spi_mmio_driver, dw_spi_mmio_probe);
137 module_init(dw_spi_mmio_init);
139 static void __exit dw_spi_mmio_exit(void)
141 platform_driver_unregister(&dw_spi_mmio_driver);
143 module_exit(dw_spi_mmio_exit);
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");