projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| c20b3b80 | 2 | /* |
| c20b3b80 HM |
3 | * |
| 4 | * Copyright (C) 2011-2015 John Crispin <[email protected]> | |
| 5 | * Copyright (C) 2015 Martin Blumenstingl <[email protected]> | |
| 6 | * Copyright (C) 2017 Hauke Mehrtens <[email protected]> | |
| 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; | |
| c20b3b80 HM |
31 | struct regmap *rcu_regmap; |
| 32 | void __iomem *xbar_membase; | |
| 33 | u32 rcu_ahb_endianness_reg_offset; | |
| 34 | int ret; | |
| 35 | ||
| 23c25c73 | 36 | xbar_membase = devm_platform_ioremap_resource(pdev, 0); |
| c20b3b80 HM |
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 | ||
| 66 | static const struct of_device_id ltq_fpi_match[] = { | |
| 67 | { .compatible = "lantiq,xrx200-fpi" }, | |
| 68 | {}, | |
| 69 | }; | |
| 70 | MODULE_DEVICE_TABLE(of, ltq_fpi_match); | |
| 71 | ||
| 72 | static 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 | ||
| 80 | module_platform_driver(ltq_fpi_driver); | |
| 81 | ||
| 82 | MODULE_DESCRIPTION("Lantiq FPI bus driver"); | |
| 83 | MODULE_LICENSE("GPL"); |