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 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, index: 0); |
37 | if (IS_ERR(ptr: xbar_membase)) |
38 | return PTR_ERR(ptr: xbar_membase); |
39 | |
40 | /* RCU configuration is optional */ |
41 | rcu_regmap = syscon_regmap_lookup_by_phandle(np, property: "lantiq,rcu" ); |
42 | if (IS_ERR(ptr: rcu_regmap)) |
43 | return PTR_ERR(ptr: rcu_regmap); |
44 | |
45 | ret = device_property_read_u32(dev, propname: "lantiq,offset-endianness" , |
46 | val: &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(map: rcu_regmap, reg: 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(root: dev->of_node, NULL, NULL, parent: 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" ); |
84 | |