88 lines
2.3 KiB
C
88 lines
2.3 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) 2011-2015 John Crispin <blogic@phrozen.org>
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* Copyright (C) 2015 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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* Copyright (C) 2017 Hauke Mehrtens <hauke@hauke-m.de>
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*/
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#include <linux/device.h>
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#include <linux/err.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_platform.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/regmap.h>
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#include <lantiq_soc.h>
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#define XBAR_ALWAYS_LAST 0x430
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#define XBAR_FPI_BURST_EN BIT(1)
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#define XBAR_AHB_BURST_EN BIT(2)
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#define RCU_VR9_BE_AHB1S 0x00000008
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static int ltq_fpi_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct resource *res_xbar;
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struct regmap *rcu_regmap;
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void __iomem *xbar_membase;
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u32 rcu_ahb_endianness_reg_offset;
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int ret;
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res_xbar = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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xbar_membase = devm_ioremap_resource(dev, res_xbar);
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if (IS_ERR(xbar_membase))
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return PTR_ERR(xbar_membase);
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/* RCU configuration is optional */
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rcu_regmap = syscon_regmap_lookup_by_phandle(np, "lantiq,rcu");
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if (IS_ERR(rcu_regmap))
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return PTR_ERR(rcu_regmap);
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ret = device_property_read_u32(dev, "lantiq,offset-endianness",
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&rcu_ahb_endianness_reg_offset);
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if (ret) {
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dev_err(&pdev->dev, "Failed to get RCU reg offset\n");
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return ret;
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}
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ret = regmap_update_bits(rcu_regmap, rcu_ahb_endianness_reg_offset,
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RCU_VR9_BE_AHB1S, RCU_VR9_BE_AHB1S);
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if (ret) {
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dev_warn(&pdev->dev,
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"Failed to configure RCU AHB endianness\n");
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return ret;
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}
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/* disable fpi burst */
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ltq_w32_mask(XBAR_FPI_BURST_EN, 0, xbar_membase + XBAR_ALWAYS_LAST);
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return of_platform_populate(dev->of_node, NULL, NULL, dev);
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}
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static const struct of_device_id ltq_fpi_match[] = {
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{ .compatible = "lantiq,xrx200-fpi" },
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{},
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};
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MODULE_DEVICE_TABLE(of, ltq_fpi_match);
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static struct platform_driver ltq_fpi_driver = {
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.probe = ltq_fpi_probe,
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.driver = {
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.name = "fpi-xway",
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.of_match_table = ltq_fpi_match,
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},
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};
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module_platform_driver(ltq_fpi_driver);
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MODULE_DESCRIPTION("Lantiq FPI bus driver");
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MODULE_LICENSE("GPL");
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