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/slab.h>
15 #include <linux/spi/dw_spi.h>
16 #include <linux/spi/spi.h>
18 #define DRIVER_NAME "dw_spi_mmio"
25 static int __devinit dw_spi_mmio_probe(struct platform_device *pdev)
27 struct dw_spi_mmio *dwsmmio;
29 struct resource *mem, *ioarea;
32 dwsmmio = kzalloc(sizeof(struct dw_spi_mmio), GFP_KERNEL);
40 /* Get basic io resource and map it */
41 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
43 dev_err(&pdev->dev, "no mem resource?\n");
48 ioarea = request_mem_region(mem->start, resource_size(mem),
51 dev_err(&pdev->dev, "SPI region already claimed\n");
56 dws->regs = ioremap_nocache(mem->start, resource_size(mem));
58 dev_err(&pdev->dev, "SPI region already mapped\n");
63 dws->irq = platform_get_irq(pdev, 0);
65 dev_err(&pdev->dev, "no irq resource?\n");
66 ret = dws->irq; /* -ENXIO */
70 dwsmmio->clk = clk_get(&pdev->dev, NULL);
75 clk_enable(dwsmmio->clk);
77 dws->parent_dev = &pdev->dev;
80 dws->max_freq = clk_get_rate(dwsmmio->clk);
82 ret = dw_spi_add_host(dws);
86 platform_set_drvdata(pdev, dwsmmio);
90 clk_disable(dwsmmio->clk);
91 clk_put(dwsmmio->clk);
94 free_irq(dws->irq, dws);
98 release_mem_region(mem->start, resource_size(mem));
105 static int __devexit dw_spi_mmio_remove(struct platform_device *pdev)
107 struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
108 struct resource *mem;
110 platform_set_drvdata(pdev, NULL);
112 clk_disable(dwsmmio->clk);
113 clk_put(dwsmmio->clk);
116 free_irq(dwsmmio->dws.irq, &dwsmmio->dws);
117 dw_spi_remove_host(&dwsmmio->dws);
118 iounmap(dwsmmio->dws.regs);
121 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
122 release_mem_region(mem->start, resource_size(mem));
126 static struct platform_driver dw_spi_mmio_driver = {
127 .remove = __devexit_p(dw_spi_mmio_remove),
130 .owner = THIS_MODULE,
134 static int __init dw_spi_mmio_init(void)
136 return platform_driver_probe(&dw_spi_mmio_driver, dw_spi_mmio_probe);
138 module_init(dw_spi_mmio_init);
140 static void __exit dw_spi_mmio_exit(void)
142 platform_driver_unregister(&dw_spi_mmio_driver);
144 module_exit(dw_spi_mmio_exit);
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");