forked from Minki/linux
c20b3b8019
Instead of hacking the configuration of the FPI bus into the arch code add an own bus driver for this internal bus. The FPI bus is the main bus of the SoC. This bus driver makes sure the bus is configured correctly before the child drivers are getting initialized. This driver will probably also be used on different SoCs later. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Acked-by: Rob Herring <robh@kernel.org> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: john@phrozen.org Cc: p.zabel@pengutronix.de Cc: kishon@ti.com Cc: mark.rutland@arm.com Cc: linux-mips@linux-mips.org Cc: linux-mtd@lists.infradead.org Cc: linux-watchdog@vger.kernel.org Cc: devicetree@vger.kernel.org Cc: linux-spi@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/17122/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/*
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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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