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drivers/spi/spi-dw-mmio.c
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81f7e3824 Initial Release, ... |
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/* * Memory-mapped interface driver for DW SPI Core * * Copyright (c) 2010, Octasic semiconductor. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. */ #include <linux/clk.h> #include <linux/err.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/spi/spi.h> #include <linux/scatterlist.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_gpio.h> #include <linux/of_platform.h> #include <linux/property.h> #include "spi-dw.h" #define DRIVER_NAME "dw_spi_mmio" struct dw_spi_mmio { struct dw_spi dws; struct clk *clk; }; static int dw_spi_mmio_probe(struct platform_device *pdev) { struct dw_spi_mmio *dwsmmio; struct dw_spi *dws; struct resource *mem; int ret; int num_cs; dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio), GFP_KERNEL); if (!dwsmmio) return -ENOMEM; dws = &dwsmmio->dws; /* Get basic io resource and map it */ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); dws->regs = devm_ioremap_resource(&pdev->dev, mem); if (IS_ERR(dws->regs)) { dev_err(&pdev->dev, "SPI region map failed "); return PTR_ERR(dws->regs); } dws->irq = platform_get_irq(pdev, 0); if (dws->irq < 0) { dev_err(&pdev->dev, "no irq resource? "); return dws->irq; /* -ENXIO */ } dwsmmio->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(dwsmmio->clk)) return PTR_ERR(dwsmmio->clk); ret = clk_prepare_enable(dwsmmio->clk); if (ret) return ret; dws->bus_num = pdev->id; dws->max_freq = clk_get_rate(dwsmmio->clk); device_property_read_u32(&pdev->dev, "reg-io-width", &dws->reg_io_width); num_cs = 4; device_property_read_u32(&pdev->dev, "num-cs", &num_cs); dws->num_cs = num_cs; if (pdev->dev.of_node) { int i; for (i = 0; i < dws->num_cs; i++) { int cs_gpio = of_get_named_gpio(pdev->dev.of_node, "cs-gpios", i); if (cs_gpio == -EPROBE_DEFER) { ret = cs_gpio; goto out; } if (gpio_is_valid(cs_gpio)) { ret = devm_gpio_request(&pdev->dev, cs_gpio, dev_name(&pdev->dev)); if (ret) goto out; } } } ret = dw_spi_add_host(&pdev->dev, dws); if (ret) goto out; platform_set_drvdata(pdev, dwsmmio); return 0; out: clk_disable_unprepare(dwsmmio->clk); return ret; } static int dw_spi_mmio_remove(struct platform_device *pdev) { struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev); dw_spi_remove_host(&dwsmmio->dws); clk_disable_unprepare(dwsmmio->clk); return 0; } static const struct of_device_id dw_spi_mmio_of_match[] = { { .compatible = "snps,dw-apb-ssi", }, { /* end of table */} }; MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match); static struct platform_driver dw_spi_mmio_driver = { .probe = dw_spi_mmio_probe, .remove = dw_spi_mmio_remove, .driver = { .name = DRIVER_NAME, .of_match_table = dw_spi_mmio_of_match, }, }; module_platform_driver(dw_spi_mmio_driver); MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>"); MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core"); MODULE_LICENSE("GPL v2"); |