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1// SPDX-License-Identifier: GPL-2.0-only2/*3 *4 * Copyright (C) 2011-2015 John Crispin <blogic@phrozen.org>5 * Copyright (C) 2015 Martin Blumenstingl <martin.blumenstingl@googlemail.com>6 * Copyright (C) 2017 Hauke Mehrtens <hauke@hauke-m.de>7 */8 9#include <linux/device.h>10#include <linux/err.h>11#include <linux/mfd/syscon.h>12#include <linux/module.h>13#include <linux/of.h>14#include <linux/of_platform.h>15#include <linux/platform_device.h>16#include <linux/property.h>17#include <linux/regmap.h>18 19#include <lantiq_soc.h>20 21#define XBAR_ALWAYS_LAST 0x43022#define XBAR_FPI_BURST_EN BIT(1)23#define XBAR_AHB_BURST_EN BIT(2)24 25#define RCU_VR9_BE_AHB1S 0x0000000826 27static int ltq_fpi_probe(struct platform_device *pdev)28{29 struct device *dev = &pdev->dev;30 struct device_node *np = dev->of_node;31 struct regmap *rcu_regmap;32 void __iomem *xbar_membase;33 u32 rcu_ahb_endianness_reg_offset;34 int ret;35 36 xbar_membase = devm_platform_ioremap_resource(pdev, 0);37 if (IS_ERR(xbar_membase))38 return PTR_ERR(xbar_membase);39 40 /* RCU configuration is optional */41 rcu_regmap = syscon_regmap_lookup_by_phandle(np, "lantiq,rcu");42 if (IS_ERR(rcu_regmap))43 return PTR_ERR(rcu_regmap);44 45 ret = device_property_read_u32(dev, "lantiq,offset-endianness",46 &rcu_ahb_endianness_reg_offset);47 if (ret) {48 dev_err(&pdev->dev, "Failed to get RCU reg offset\n");49 return ret;50 }51 52 ret = regmap_update_bits(rcu_regmap, rcu_ahb_endianness_reg_offset,53 RCU_VR9_BE_AHB1S, RCU_VR9_BE_AHB1S);54 if (ret) {55 dev_warn(&pdev->dev,56 "Failed to configure RCU AHB endianness\n");57 return ret;58 }59 60 /* disable fpi burst */61 ltq_w32_mask(XBAR_FPI_BURST_EN, 0, xbar_membase + XBAR_ALWAYS_LAST);62 63 return of_platform_populate(dev->of_node, NULL, NULL, dev);64}65 66static const struct of_device_id ltq_fpi_match[] = {67 { .compatible = "lantiq,xrx200-fpi" },68 {},69};70MODULE_DEVICE_TABLE(of, ltq_fpi_match);71 72static struct platform_driver ltq_fpi_driver = {73 .probe = ltq_fpi_probe,74 .driver = {75 .name = "fpi-xway",76 .of_match_table = ltq_fpi_match,77 },78};79 80module_platform_driver(ltq_fpi_driver);81 82MODULE_DESCRIPTION("Lantiq FPI bus driver");83MODULE_LICENSE("GPL");84