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Release 4.14 drivers/reset/reset-socfpga.c

Directory: drivers/reset
/*
 * Socfpga Reset Controller Driver
 *
 * Copyright 2014 Steffen Trumtrar <s.trumtrar@pengutronix.de>
 *
 * based on
 * Allwinner SoCs Reset Controller driver
 *
 * Copyright 2013 Maxime Ripard
 *
 * Maxime Ripard <maxime.ripard@free-electrons.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/spinlock.h>
#include <linux/types.h>


#define BANK_INCREMENT		4

#define NR_BANKS		8


struct socfpga_reset_data {
	
spinlock_t			lock;
	
void __iomem			*membase;
	
struct reset_controller_dev	rcdev;
};


static int socfpga_reset_assert(struct reset_controller_dev *rcdev, unsigned long id) { struct socfpga_reset_data *data = container_of(rcdev, struct socfpga_reset_data, rcdev); int reg_width = sizeof(u32); int bank = id / (reg_width * BITS_PER_BYTE); int offset = id % (reg_width * BITS_PER_BYTE); unsigned long flags; u32 reg; spin_lock_irqsave(&data->lock, flags); reg = readl(data->membase + (bank * BANK_INCREMENT)); writel(reg | BIT(offset), data->membase + (bank * BANK_INCREMENT)); spin_unlock_irqrestore(&data->lock, flags); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Trumtrar10584.00%133.33%
Dinh Nguyen1814.40%133.33%
Rojhalat Ibrahim21.60%133.33%
Total125100.00%3100.00%


static int socfpga_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id) { struct socfpga_reset_data *data = container_of(rcdev, struct socfpga_reset_data, rcdev); int reg_width = sizeof(u32); int bank = id / (reg_width * BITS_PER_BYTE); int offset = id % (reg_width * BITS_PER_BYTE); unsigned long flags; u32 reg; spin_lock_irqsave(&data->lock, flags); reg = readl(data->membase + (bank * BANK_INCREMENT)); writel(reg & ~BIT(offset), data->membase + (bank * BANK_INCREMENT)); spin_unlock_irqrestore(&data->lock, flags); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Trumtrar10684.13%133.33%
Dinh Nguyen1814.29%133.33%
Rojhalat Ibrahim21.59%133.33%
Total126100.00%3100.00%


static int socfpga_reset_status(struct reset_controller_dev *rcdev, unsigned long id) { struct socfpga_reset_data *data = container_of(rcdev, struct socfpga_reset_data, rcdev); int reg_width = sizeof(u32); int bank = id / (reg_width * BITS_PER_BYTE); int offset = id % (reg_width * BITS_PER_BYTE); u32 reg; reg = readl(data->membase + (bank * BANK_INCREMENT)); return !(reg & BIT(offset)); }

Contributors

PersonTokensPropCommitsCommitProp
Dinh Nguyen8898.88%266.67%
Rojhalat Ibrahim11.12%133.33%
Total89100.00%3100.00%

static const struct reset_control_ops socfpga_reset_ops = { .assert = socfpga_reset_assert, .deassert = socfpga_reset_deassert, .status = socfpga_reset_status, };
static int socfpga_reset_probe(struct platform_device *pdev) { struct socfpga_reset_data *data; struct resource *res; struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; u32 modrst_offset; /* * The binding was mainlined without the required property. * Do not continue, when we encounter an old DT. */ if (!of_find_property(pdev->dev.of_node, "#reset-cells", NULL)) { dev_err(&pdev->dev, "%pOF missing #reset-cells property\n", pdev->dev.of_node); return -EINVAL; } data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); data->membase = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(data->membase)) return PTR_ERR(data->membase); if (of_property_read_u32(np, "altr,modrst-offset", &modrst_offset)) { dev_warn(dev, "missing altr,modrst-offset property, assuming 0x10!\n"); modrst_offset = 0x10; } data->membase += modrst_offset; spin_lock_init(&data->lock); data->rcdev.owner = THIS_MODULE; data->rcdev.nr_resets = NR_BANKS * (sizeof(u32) * BITS_PER_BYTE); data->rcdev.ops = &socfpga_reset_ops; data->rcdev.of_node = pdev->dev.of_node; return devm_reset_controller_register(dev, &data->rcdev); }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Trumtrar18173.28%114.29%
Dinh Nguyen5221.05%228.57%
Philipp Zabel93.64%114.29%
Masahiro Yamada41.62%228.57%
Rob Herring10.40%114.29%
Total247100.00%7100.00%

static const struct of_device_id socfpga_reset_dt_ids[] = { { .compatible = "altr,rst-mgr", }, { /* sentinel */ }, }; static struct platform_driver socfpga_reset_driver = { .probe = socfpga_reset_probe, .driver = { .name = "socfpga-reset", .of_match_table = socfpga_reset_dt_ids, }, }; builtin_platform_driver(socfpga_reset_driver);

Overall Contributors

PersonTokensPropCommitsCommitProp
Steffen Trumtrar50370.65%19.09%
Dinh Nguyen18125.42%327.27%
Philipp Zabel101.40%218.18%
Rojhalat Ibrahim101.40%19.09%
Masahiro Yamada40.56%218.18%
Paul Gortmaker30.42%19.09%
Rob Herring10.14%19.09%
Total712100.00%11100.00%
Directory: drivers/reset
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