diff options
Diffstat (limited to 'drivers/soc/lantiq/fpi-bus.c')
| -rw-r--r-- | drivers/soc/lantiq/fpi-bus.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/drivers/soc/lantiq/fpi-bus.c b/drivers/soc/lantiq/fpi-bus.c new file mode 100644 index 000000000000..a671c9984c4c --- /dev/null +++ b/drivers/soc/lantiq/fpi-bus.c @@ -0,0 +1,87 @@ +/* + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * Copyright (C) 2011-2015 John Crispin <blogic@phrozen.org> + * Copyright (C) 2015 Martin Blumenstingl <martin.blumenstingl@googlemail.com> + * Copyright (C) 2017 Hauke Mehrtens <hauke@hauke-m.de> + */ + +#include <linux/device.h> +#include <linux/err.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/property.h> +#include <linux/regmap.h> + +#include <lantiq_soc.h> + +#define XBAR_ALWAYS_LAST 0x430 +#define XBAR_FPI_BURST_EN BIT(1) +#define XBAR_AHB_BURST_EN BIT(2) + +#define RCU_VR9_BE_AHB1S 0x00000008 + +static int ltq_fpi_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct resource *res_xbar; + struct regmap *rcu_regmap; + void __iomem *xbar_membase; + u32 rcu_ahb_endianness_reg_offset; + int ret; + + res_xbar = platform_get_resource(pdev, IORESOURCE_MEM, 0); + xbar_membase = devm_ioremap_resource(dev, res_xbar); + if (IS_ERR(xbar_membase)) + return PTR_ERR(xbar_membase); + + /* RCU configuration is optional */ + rcu_regmap = syscon_regmap_lookup_by_phandle(np, "lantiq,rcu"); + if (IS_ERR(rcu_regmap)) + return PTR_ERR(rcu_regmap); + + ret = device_property_read_u32(dev, "lantiq,offset-endianness", + &rcu_ahb_endianness_reg_offset); + if (ret) { + dev_err(&pdev->dev, "Failed to get RCU reg offset\n"); + return ret; + } + + ret = regmap_update_bits(rcu_regmap, rcu_ahb_endianness_reg_offset, + RCU_VR9_BE_AHB1S, RCU_VR9_BE_AHB1S); + if (ret) { + dev_warn(&pdev->dev, + "Failed to configure RCU AHB endianness\n"); + return ret; + } + + /* disable fpi burst */ + ltq_w32_mask(XBAR_FPI_BURST_EN, 0, xbar_membase + XBAR_ALWAYS_LAST); + + return of_platform_populate(dev->of_node, NULL, NULL, dev); +} + +static const struct of_device_id ltq_fpi_match[] = { + { .compatible = "lantiq,xrx200-fpi" }, + {}, +}; +MODULE_DEVICE_TABLE(of, ltq_fpi_match); + +static struct platform_driver ltq_fpi_driver = { + .probe = ltq_fpi_probe, + .driver = { + .name = "fpi-xway", + .of_match_table = ltq_fpi_match, + }, +}; + +module_platform_driver(ltq_fpi_driver); + +MODULE_DESCRIPTION("Lantiq FPI bus driver"); +MODULE_LICENSE("GPL"); |