1 // SPDX-License-Identifier: GPL-2.0-only
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>
9 #include <linux/device.h>
10 #include <linux/err.h>
11 #include <linux/mfd/syscon.h>
12 #include <linux/module.h>
14 #include <linux/of_platform.h>
15 #include <linux/platform_device.h>
16 #include <linux/property.h>
17 #include <linux/regmap.h>
19 #include <lantiq_soc.h>
21 #define XBAR_ALWAYS_LAST 0x430
22 #define XBAR_FPI_BURST_EN BIT(1)
23 #define XBAR_AHB_BURST_EN BIT(2)
25 #define RCU_VR9_BE_AHB1S 0x00000008
27 static int ltq_fpi_probe(struct platform_device *pdev)
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;
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);
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);
47 ret = device_property_read_u32(dev, "lantiq,offset-endianness",
48 &rcu_ahb_endianness_reg_offset);
50 dev_err(&pdev->dev, "Failed to get RCU reg offset\n");
54 ret = regmap_update_bits(rcu_regmap, rcu_ahb_endianness_reg_offset,
55 RCU_VR9_BE_AHB1S, RCU_VR9_BE_AHB1S);
58 "Failed to configure RCU AHB endianness\n");
62 /* disable fpi burst */
63 ltq_w32_mask(XBAR_FPI_BURST_EN, 0, xbar_membase + XBAR_ALWAYS_LAST);
65 return of_platform_populate(dev->of_node, NULL, NULL, dev);
68 static const struct of_device_id ltq_fpi_match[] = {
69 { .compatible = "lantiq,xrx200-fpi" },
72 MODULE_DEVICE_TABLE(of, ltq_fpi_match);
74 static struct platform_driver ltq_fpi_driver = {
75 .probe = ltq_fpi_probe,
78 .of_match_table = ltq_fpi_match,
82 module_platform_driver(ltq_fpi_driver);
84 MODULE_DESCRIPTION("Lantiq FPI bus driver");
85 MODULE_LICENSE("GPL");