diff options
Diffstat (limited to 'drivers/reset/hisilicon/hi6220_reset.c')
| -rw-r--r-- | drivers/reset/hisilicon/hi6220_reset.c | 80 |
1 files changed, 72 insertions, 8 deletions
diff --git a/drivers/reset/hisilicon/hi6220_reset.c b/drivers/reset/hisilicon/hi6220_reset.c index d5e5229308f2..65aa5ff5ed82 100644 --- a/drivers/reset/hisilicon/hi6220_reset.c +++ b/drivers/reset/hisilicon/hi6220_reset.c @@ -1,14 +1,11 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Hisilicon Hi6220 reset controller driver * * Copyright (c) 2016 Linaro Limited. - * Copyright (c) 2015-2016 Hisilicon Limited. + * Copyright (c) 2015-2016 HiSilicon Limited. * * Author: Feng Chen <puck.chen@hisilicon.com> - * - * 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. */ #include <linux/io.h> @@ -16,7 +13,6 @@ #include <linux/module.h> #include <linux/bitops.h> #include <linux/of.h> -#include <linux/of_device.h> #include <linux/regmap.h> #include <linux/mfd/syscon.h> #include <linux/reset-controller.h> @@ -36,6 +32,7 @@ enum hi6220_reset_ctrl_type { PERIPHERAL, MEDIA, + AO, }; struct hi6220_reset_data { @@ -95,6 +92,65 @@ static const struct reset_control_ops hi6220_media_reset_ops = { .deassert = hi6220_media_deassert, }; +#define AO_SCTRL_SC_PW_CLKEN0 0x800 +#define AO_SCTRL_SC_PW_CLKDIS0 0x804 + +#define AO_SCTRL_SC_PW_RSTEN0 0x810 +#define AO_SCTRL_SC_PW_RSTDIS0 0x814 + +#define AO_SCTRL_SC_PW_ISOEN0 0x820 +#define AO_SCTRL_SC_PW_ISODIS0 0x824 +#define AO_MAX_INDEX 12 + +static int hi6220_ao_assert(struct reset_controller_dev *rc_dev, + unsigned long idx) +{ + struct hi6220_reset_data *data = to_reset_data(rc_dev); + struct regmap *regmap = data->regmap; + int ret; + + ret = regmap_write(regmap, AO_SCTRL_SC_PW_RSTEN0, BIT(idx)); + if (ret) + return ret; + + ret = regmap_write(regmap, AO_SCTRL_SC_PW_ISOEN0, BIT(idx)); + if (ret) + return ret; + + ret = regmap_write(regmap, AO_SCTRL_SC_PW_CLKDIS0, BIT(idx)); + return ret; +} + +static int hi6220_ao_deassert(struct reset_controller_dev *rc_dev, + unsigned long idx) +{ + struct hi6220_reset_data *data = to_reset_data(rc_dev); + struct regmap *regmap = data->regmap; + int ret; + + /* + * It was suggested to disable isolation before enabling + * the clocks and deasserting reset, to avoid glitches. + * But this order is preserved to keep it matching the + * vendor code. + */ + ret = regmap_write(regmap, AO_SCTRL_SC_PW_RSTDIS0, BIT(idx)); + if (ret) + return ret; + + ret = regmap_write(regmap, AO_SCTRL_SC_PW_ISODIS0, BIT(idx)); + if (ret) + return ret; + + ret = regmap_write(regmap, AO_SCTRL_SC_PW_CLKEN0, BIT(idx)); + return ret; +} + +static const struct reset_control_ops hi6220_ao_reset_ops = { + .assert = hi6220_ao_assert, + .deassert = hi6220_ao_deassert, +}; + static int hi6220_reset_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; @@ -107,7 +163,7 @@ static int hi6220_reset_probe(struct platform_device *pdev) if (!data) return -ENOMEM; - type = (enum hi6220_reset_ctrl_type)of_device_get_match_data(dev); + type = (uintptr_t)of_device_get_match_data(dev); regmap = syscon_node_to_regmap(np); if (IS_ERR(regmap)) { @@ -120,9 +176,12 @@ static int hi6220_reset_probe(struct platform_device *pdev) if (type == MEDIA) { data->rc_dev.ops = &hi6220_media_reset_ops; data->rc_dev.nr_resets = MEDIA_MAX_INDEX; - } else { + } else if (type == PERIPHERAL) { data->rc_dev.ops = &hi6220_peripheral_reset_ops; data->rc_dev.nr_resets = PERIPH_MAX_INDEX; + } else { + data->rc_dev.ops = &hi6220_ao_reset_ops; + data->rc_dev.nr_resets = AO_MAX_INDEX; } return reset_controller_register(&data->rc_dev); @@ -137,6 +196,10 @@ static const struct of_device_id hi6220_reset_match[] = { .compatible = "hisilicon,hi6220-mediactrl", .data = (void *)MEDIA, }, + { + .compatible = "hisilicon,hi6220-aoctrl", + .data = (void *)AO, + }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, hi6220_reset_match); @@ -156,4 +219,5 @@ static int __init hi6220_reset_init(void) postcore_initcall(hi6220_reset_init); +MODULE_DESCRIPTION("Hisilicon Hi6220 reset controller driver"); MODULE_LICENSE("GPL v2"); |