1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 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 0x430 22 #define XBAR_FPI_BURST_EN BIT(1) 23 #define XBAR_AHB_BURST_EN BIT(2) 24 25 #define RCU_VR9_BE_AHB1S 0x00000008 26 27 static 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 resource *res_xbar; 32 struct regmap *rcu_regmap; 33 void __iomem *xbar_membase; 34 u32 rcu_ahb_endianness_reg_offset; 35 int ret; 36 37 res_xbar = platform_get_resource(pdev, IORESOURCE_MEM, 0); 38 xbar_membase = devm_ioremap_resource(dev, res_xbar); 39 if (IS_ERR(xbar_membase)) 40 return PTR_ERR(xbar_membase); 41 42 /* RCU configuration is optional */ 43 rcu_regmap = syscon_regmap_lookup_by_phandle(np, "lantiq,rcu"); 44 if (IS_ERR(rcu_regmap)) 45 return PTR_ERR(rcu_regmap); 46 47 ret = device_property_read_u32(dev, "lantiq,offset-endianness", 48 &rcu_ahb_endianness_reg_offset); 49 if (ret) { 50 dev_err(&pdev->dev, "Failed to get RCU reg offset\n"); 51 return ret; 52 } 53 54 ret = regmap_update_bits(rcu_regmap, rcu_ahb_endianness_reg_offset, 55 RCU_VR9_BE_AHB1S, RCU_VR9_BE_AHB1S); 56 if (ret) { 57 dev_warn(&pdev->dev, 58 "Failed to configure RCU AHB endianness\n"); 59 return ret; 60 } 61 62 /* disable fpi burst */ 63 ltq_w32_mask(XBAR_FPI_BURST_EN, 0, xbar_membase + XBAR_ALWAYS_LAST); 64 65 return of_platform_populate(dev->of_node, NULL, NULL, dev); 66 } 67 68 static const struct of_device_id ltq_fpi_match[] = { 69 { .compatible = "lantiq,xrx200-fpi" }, 70 {}, 71 }; 72 MODULE_DEVICE_TABLE(of, ltq_fpi_match); 73 74 static struct platform_driver ltq_fpi_driver = { 75 .probe = ltq_fpi_probe, 76 .driver = { 77 .name = "fpi-xway", 78 .of_match_table = ltq_fpi_match, 79 }, 80 }; 81 82 module_platform_driver(ltq_fpi_driver); 83 84 MODULE_DESCRIPTION("Lantiq FPI bus driver"); 85 MODULE_LICENSE("GPL"); 86