147 lines
3.2 KiB
C
147 lines
3.2 KiB
C
/*
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* Memory-mapped interface driver for DW SPI Core
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*
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* Copyright (c) 2010, Octasic semiconductor.
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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 and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include <linux/scatterlist.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/of_platform.h>
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#include "spi-dw.h"
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#define DRIVER_NAME "dw_spi_mmio"
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struct dw_spi_mmio {
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struct dw_spi dws;
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struct clk *clk;
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};
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static int dw_spi_mmio_probe(struct platform_device *pdev)
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{
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struct dw_spi_mmio *dwsmmio;
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struct dw_spi *dws;
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struct resource *mem;
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int ret;
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int num_cs;
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dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio),
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GFP_KERNEL);
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if (!dwsmmio)
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return -ENOMEM;
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dws = &dwsmmio->dws;
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/* Get basic io resource and map it */
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!mem) {
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dev_err(&pdev->dev, "no mem resource?\n");
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return -EINVAL;
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}
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dws->regs = devm_ioremap_resource(&pdev->dev, mem);
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if (IS_ERR(dws->regs)) {
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dev_err(&pdev->dev, "SPI region map failed\n");
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return PTR_ERR(dws->regs);
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}
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dws->irq = platform_get_irq(pdev, 0);
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if (dws->irq < 0) {
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dev_err(&pdev->dev, "no irq resource?\n");
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return dws->irq; /* -ENXIO */
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}
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dwsmmio->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(dwsmmio->clk))
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return PTR_ERR(dwsmmio->clk);
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ret = clk_prepare_enable(dwsmmio->clk);
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if (ret)
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return ret;
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dws->bus_num = pdev->id;
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dws->max_freq = clk_get_rate(dwsmmio->clk);
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num_cs = 4;
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if (pdev->dev.of_node)
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of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
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dws->num_cs = num_cs;
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if (pdev->dev.of_node) {
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int i;
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for (i = 0; i < dws->num_cs; i++) {
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int cs_gpio = of_get_named_gpio(pdev->dev.of_node,
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"cs-gpios", i);
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if (cs_gpio == -EPROBE_DEFER) {
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ret = cs_gpio;
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goto out;
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}
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if (gpio_is_valid(cs_gpio)) {
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ret = devm_gpio_request(&pdev->dev, cs_gpio,
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dev_name(&pdev->dev));
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if (ret)
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goto out;
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}
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}
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}
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ret = dw_spi_add_host(&pdev->dev, dws);
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if (ret)
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goto out;
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platform_set_drvdata(pdev, dwsmmio);
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return 0;
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out:
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clk_disable_unprepare(dwsmmio->clk);
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return ret;
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}
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static int dw_spi_mmio_remove(struct platform_device *pdev)
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{
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struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
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clk_disable_unprepare(dwsmmio->clk);
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dw_spi_remove_host(&dwsmmio->dws);
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return 0;
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}
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static const struct of_device_id dw_spi_mmio_of_match[] = {
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{ .compatible = "snps,dw-apb-ssi", },
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{ /* end of table */}
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};
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MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
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static struct platform_driver dw_spi_mmio_driver = {
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.probe = dw_spi_mmio_probe,
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.remove = dw_spi_mmio_remove,
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.driver = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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.of_match_table = dw_spi_mmio_of_match,
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},
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};
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module_platform_driver(dw_spi_mmio_driver);
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MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>");
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MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core");
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MODULE_LICENSE("GPL v2");
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