mirror of https://gitee.com/openkylin/linux.git
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* Copyright (C) 2012 John Crispin <blogic@openwrt.org>
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*/
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/of_gpio.h>
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#include <linux/dma-mapping.h>
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#include <lantiq_soc.h>
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static unsigned int *cp1_base;
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unsigned int *ltq_get_cp1_base(void)
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{
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if (!cp1_base)
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panic("no cp1 base was set\n");
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return cp1_base;
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}
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EXPORT_SYMBOL(ltq_get_cp1_base);
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static int vmmc_probe(struct platform_device *pdev)
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{
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#define CP1_SIZE (1 << 20)
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int gpio_count;
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dma_addr_t dma;
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cp1_base =
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(void *) CPHYSADDR(dma_alloc_coherent(NULL, CP1_SIZE,
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&dma, GFP_ATOMIC));
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gpio_count = of_gpio_count(pdev->dev.of_node);
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while (gpio_count > 0) {
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enum of_gpio_flags flags;
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int gpio = of_get_gpio_flags(pdev->dev.of_node,
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--gpio_count, &flags);
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if (gpio_request(gpio, "vmmc-relay"))
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continue;
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dev_info(&pdev->dev, "requested GPIO %d\n", gpio);
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gpio_direction_output(gpio,
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(flags & OF_GPIO_ACTIVE_LOW) ? (0) : (1));
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}
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dev_info(&pdev->dev, "reserved %dMB at 0x%p", CP1_SIZE >> 20, cp1_base);
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return 0;
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}
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static const struct of_device_id vmmc_match[] = {
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{ .compatible = "lantiq,vmmc-xway" },
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{},
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};
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MODULE_DEVICE_TABLE(of, vmmc_match);
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static struct platform_driver vmmc_driver = {
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.probe = vmmc_probe,
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.driver = {
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.name = "lantiq,vmmc",
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.of_match_table = vmmc_match,
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},
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};
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module_platform_driver(vmmc_driver);
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