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/err.h>
13 #include <linux/interrupt.h>
14 #include <linux/platform_device.h>
15 #include <linux/slab.h>
16 #include <linux/spi/dw_spi.h>
17 #include <linux/spi/spi.h>
19 #define DRIVER_NAME "dw_spi_mmio"
26 static int __devinit dw_spi_mmio_probe(struct platform_device *pdev)
28 struct dw_spi_mmio *dwsmmio;
30 struct resource *mem, *ioarea;
33 dwsmmio = kzalloc(sizeof(struct dw_spi_mmio), GFP_KERNEL);
41 /* Get basic io resource and map it */
42 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
44 dev_err(&pdev->dev, "no mem resource?\n");
49 ioarea = request_mem_region(mem->start, resource_size(mem),
52 dev_err(&pdev->dev, "SPI region already claimed\n");
57 dws->regs = ioremap_nocache(mem->start, resource_size(mem));
59 dev_err(&pdev->dev, "SPI region already mapped\n");
64 dws->irq = platform_get_irq(pdev, 0);
66 dev_err(&pdev->dev, "no irq resource?\n");
67 ret = dws->irq; /* -ENXIO */
71 dwsmmio->clk = clk_get(&pdev->dev, NULL);
72 if (IS_ERR(dwsmmio->clk)) {
73 ret = PTR_ERR(dwsmmio->clk);
76 clk_enable(dwsmmio->clk);
78 dws->parent_dev = &pdev->dev;
81 dws->max_freq = clk_get_rate(dwsmmio->clk);
83 ret = dw_spi_add_host(dws);
87 platform_set_drvdata(pdev, dwsmmio);
91 clk_disable(dwsmmio->clk);
92 clk_put(dwsmmio->clk);
95 free_irq(dws->irq, dws);
99 release_mem_region(mem->start, resource_size(mem));
106 static int __devexit dw_spi_mmio_remove(struct platform_device *pdev)
108 struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
109 struct resource *mem;
111 platform_set_drvdata(pdev, NULL);
113 clk_disable(dwsmmio->clk);
114 clk_put(dwsmmio->clk);
117 free_irq(dwsmmio->dws.irq, &dwsmmio->dws);
118 dw_spi_remove_host(&dwsmmio->dws);
119 iounmap(dwsmmio->dws.regs);
122 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
123 release_mem_region(mem->start, resource_size(mem));
127 static struct platform_driver dw_spi_mmio_driver = {
128 .remove = __devexit_p(dw_spi_mmio_remove),
131 .owner = THIS_MODULE,
135 static int __init dw_spi_mmio_init(void)
137 return platform_driver_probe(&dw_spi_mmio_driver, dw_spi_mmio_probe);
139 module_init(dw_spi_mmio_init);
141 static void __exit dw_spi_mmio_exit(void)
143 platform_driver_unregister(&dw_spi_mmio_driver);
145 module_exit(dw_spi_mmio_exit);
147 MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>");
148 MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core");
149 MODULE_LICENSE("GPL v2");