| Hauke Mehrtens | c20b3b8 | 2017-08-20 00:18:15 +0200 | [diff] [blame] | 1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify it |
| 3 | * under the terms of the GNU General Public License version 2 as published |
| 4 | * by the Free Software Foundation. |
| 5 | * |
| 6 | * Copyright (C) 2011-2015 John Crispin <blogic@phrozen.org> |
| 7 | * Copyright (C) 2015 Martin Blumenstingl <martin.blumenstingl@googlemail.com> |
| 8 | * Copyright (C) 2017 Hauke Mehrtens <hauke@hauke-m.de> |
| 9 | */ |
| 10 | |
| 11 | #include <linux/device.h> |
| 12 | #include <linux/err.h> |
| 13 | #include <linux/mfd/syscon.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/of.h> |
| 16 | #include <linux/of_platform.h> |
| 17 | #include <linux/platform_device.h> |
| 18 | #include <linux/property.h> |
| 19 | #include <linux/regmap.h> |
| 20 | |
| 21 | #include <lantiq_soc.h> |
| 22 | |
| 23 | #define XBAR_ALWAYS_LAST 0x430 |
| 24 | #define XBAR_FPI_BURST_EN BIT(1) |
| 25 | #define XBAR_AHB_BURST_EN BIT(2) |
| 26 | |
| 27 | #define RCU_VR9_BE_AHB1S 0x00000008 |
| 28 | |
| 29 | static int ltq_fpi_probe(struct platform_device *pdev) |
| 30 | { |
| 31 | struct device *dev = &pdev->dev; |
| 32 | struct device_node *np = dev->of_node; |
| 33 | struct resource *res_xbar; |
| 34 | struct regmap *rcu_regmap; |
| 35 | void __iomem *xbar_membase; |
| 36 | u32 rcu_ahb_endianness_reg_offset; |
| 37 | int ret; |
| 38 | |
| 39 | res_xbar = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 40 | xbar_membase = devm_ioremap_resource(dev, res_xbar); |
| 41 | if (IS_ERR(xbar_membase)) |
| 42 | return PTR_ERR(xbar_membase); |
| 43 | |
| 44 | /* RCU configuration is optional */ |
| 45 | rcu_regmap = syscon_regmap_lookup_by_phandle(np, "lantiq,rcu"); |
| 46 | if (IS_ERR(rcu_regmap)) |
| 47 | return PTR_ERR(rcu_regmap); |
| 48 | |
| 49 | ret = device_property_read_u32(dev, "lantiq,offset-endianness", |
| 50 | &rcu_ahb_endianness_reg_offset); |
| 51 | if (ret) { |
| 52 | dev_err(&pdev->dev, "Failed to get RCU reg offset\n"); |
| 53 | return ret; |
| 54 | } |
| 55 | |
| 56 | ret = regmap_update_bits(rcu_regmap, rcu_ahb_endianness_reg_offset, |
| 57 | RCU_VR9_BE_AHB1S, RCU_VR9_BE_AHB1S); |
| 58 | if (ret) { |
| 59 | dev_warn(&pdev->dev, |
| 60 | "Failed to configure RCU AHB endianness\n"); |
| 61 | return ret; |
| 62 | } |
| 63 | |
| 64 | /* disable fpi burst */ |
| 65 | ltq_w32_mask(XBAR_FPI_BURST_EN, 0, xbar_membase + XBAR_ALWAYS_LAST); |
| 66 | |
| 67 | return of_platform_populate(dev->of_node, NULL, NULL, dev); |
| 68 | } |
| 69 | |
| 70 | static const struct of_device_id ltq_fpi_match[] = { |
| 71 | { .compatible = "lantiq,xrx200-fpi" }, |
| 72 | {}, |
| 73 | }; |
| 74 | MODULE_DEVICE_TABLE(of, ltq_fpi_match); |
| 75 | |
| 76 | static struct platform_driver ltq_fpi_driver = { |
| 77 | .probe = ltq_fpi_probe, |
| 78 | .driver = { |
| 79 | .name = "fpi-xway", |
| 80 | .of_match_table = ltq_fpi_match, |
| 81 | }, |
| 82 | }; |
| 83 | |
| 84 | module_platform_driver(ltq_fpi_driver); |
| 85 | |
| 86 | MODULE_DESCRIPTION("Lantiq FPI bus driver"); |
| 87 | MODULE_LICENSE("GPL"); |