148 lines
3.3 KiB
C
148 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Memory-mapped interface driver for SUNWAY CHIP3 SPI Core
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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/mfd/syscon.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 <linux/property.h>
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#include <linux/regmap.h>
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#include "spi-chip3.h"
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#define DRIVER_NAME "sunway_chip3_spi"
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struct chip3_spi_mmio {
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struct chip3_spi dws;
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struct clk *clk;
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void *priv;
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};
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static int chip3_spi_mmio_probe(struct platform_device *pdev)
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{
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int (*init_func)(struct platform_device *pdev,
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struct chip3_spi_mmio *dwsmmio);
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struct chip3_spi_mmio *dwsmmio;
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struct chip3_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 chip3_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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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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device_property_read_u32(&pdev->dev, "reg-io-width",
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&dws->reg_io_width);
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num_cs = 4;
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device_property_read_u32(&pdev->dev, "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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init_func = device_get_match_data(&pdev->dev);
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if (init_func) {
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ret = init_func(pdev, dwsmmio);
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if (ret)
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goto out;
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}
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ret = chip3_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 chip3_spi_mmio_remove(struct platform_device *pdev)
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{
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struct chip3_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
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chip3_spi_remove_host(&dwsmmio->dws);
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clk_disable_unprepare(dwsmmio->clk);
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return 0;
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}
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static const struct of_device_id chip3_spi_mmio_of_match[] = {
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{ .compatible = "sunway,chip3-spi", },
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{ /* end of table */}
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};
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MODULE_DEVICE_TABLE(of, chip3_spi_mmio_of_match);
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static struct platform_driver chip3_spi_mmio_driver = {
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.probe = chip3_spi_mmio_probe,
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.remove = chip3_spi_mmio_remove,
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.driver = {
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.name = DRIVER_NAME,
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.of_match_table = chip3_spi_mmio_of_match,
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},
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};
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module_platform_driver(chip3_spi_mmio_driver);
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MODULE_AUTHOR("Platform@wxiat.com");
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MODULE_DESCRIPTION("Memory-mapped I/O interface driver for Sunway CHIP3");
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MODULE_LICENSE("GPL");
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