// SPDX-License-Identifier: GPL-2.0-only /* * * Copyright (C) 2011-2015 John Crispin <blogic@phrozen.org> * Copyright (C) 2015 Martin Blumenstingl <martin.blumenstingl@googlemail.com> * Copyright (C) 2017 Hauke Mehrtens <hauke@hauke-m.de> */ #include <linux/device.h> #include <linux/err.h> #include <linux/mfd/syscon.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/property.h> #include <linux/regmap.h> #include <lantiq_soc.h> #define XBAR_ALWAYS_LAST 0x430 #define XBAR_FPI_BURST_EN BIT(1) #define XBAR_AHB_BURST_EN BIT(2) #define RCU_VR9_BE_AHB1S 0x00000008 static int ltq_fpi_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; struct regmap *rcu_regmap; void __iomem *xbar_membase; u32 rcu_ahb_endianness_reg_offset; int ret; xbar_membase = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(xbar_membase)) return PTR_ERR(xbar_membase); /* RCU configuration is optional */ rcu_regmap = syscon_regmap_lookup_by_phandle(np, "lantiq,rcu"); if (IS_ERR(rcu_regmap)) return PTR_ERR(rcu_regmap); ret = device_property_read_u32(dev, "lantiq,offset-endianness", &rcu_ahb_endianness_reg_offset); if (ret) { dev_err(&pdev->dev, "Failed to get RCU reg offset\n"); return ret; } ret = regmap_update_bits(rcu_regmap, rcu_ahb_endianness_reg_offset, RCU_VR9_BE_AHB1S, RCU_VR9_BE_AHB1S); if (ret) { dev_warn(&pdev->dev, "Failed to configure RCU AHB endianness\n"); return ret; } /* disable fpi burst */ ltq_w32_mask(XBAR_FPI_BURST_EN, 0, xbar_membase + XBAR_ALWAYS_LAST); return of_platform_populate(dev->of_node, NULL, NULL, dev); } static const struct of_device_id ltq_fpi_match[] = { { .compatible = "lantiq,xrx200-fpi" }, {}, }; MODULE_DEVICE_TABLE(of, ltq_fpi_match); static struct platform_driver ltq_fpi_driver = { .probe = ltq_fpi_probe, .driver = { .name = "fpi-xway", .of_match_table = ltq_fpi_match, }, }; module_platform_driver(ltq_fpi_driver); MODULE_DESCRIPTION("Lantiq FPI bus driver"); MODULE_LICENSE("GPL");