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99 lines
2.5 KiB
99 lines
2.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (c) 2017-18 Linaro Limited |
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#include <linux/delay.h> |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_platform.h> |
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#include <linux/platform_device.h> |
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#include <linux/reboot.h> |
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#include <linux/reboot-mode.h> |
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#include <linux/regmap.h> |
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#define PON_SOFT_RB_SPARE 0x8f |
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#define GEN1_REASON_SHIFT 2 |
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#define GEN2_REASON_SHIFT 1 |
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struct pm8916_pon { |
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struct device *dev; |
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struct regmap *regmap; |
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u32 baseaddr; |
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struct reboot_mode_driver reboot_mode; |
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long reason_shift; |
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}; |
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static int pm8916_reboot_mode_write(struct reboot_mode_driver *reboot, |
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unsigned int magic) |
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{ |
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struct pm8916_pon *pon = container_of |
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(reboot, struct pm8916_pon, reboot_mode); |
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int ret; |
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ret = regmap_update_bits(pon->regmap, |
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pon->baseaddr + PON_SOFT_RB_SPARE, |
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GENMASK(7, pon->reason_shift), |
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magic << pon->reason_shift); |
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if (ret < 0) |
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dev_err(pon->dev, "update reboot mode bits failed\n"); |
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return ret; |
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} |
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static int pm8916_pon_probe(struct platform_device *pdev) |
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{ |
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struct pm8916_pon *pon; |
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int error; |
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pon = devm_kzalloc(&pdev->dev, sizeof(*pon), GFP_KERNEL); |
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if (!pon) |
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return -ENOMEM; |
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pon->dev = &pdev->dev; |
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pon->regmap = dev_get_regmap(pdev->dev.parent, NULL); |
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if (!pon->regmap) { |
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dev_err(&pdev->dev, "failed to locate regmap\n"); |
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return -ENODEV; |
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} |
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error = of_property_read_u32(pdev->dev.of_node, "reg", |
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&pon->baseaddr); |
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if (error) |
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return error; |
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pon->reboot_mode.dev = &pdev->dev; |
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pon->reason_shift = (long)of_device_get_match_data(&pdev->dev); |
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pon->reboot_mode.write = pm8916_reboot_mode_write; |
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error = devm_reboot_mode_register(&pdev->dev, &pon->reboot_mode); |
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if (error) { |
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dev_err(&pdev->dev, "can't register reboot mode\n"); |
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return error; |
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} |
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platform_set_drvdata(pdev, pon); |
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return devm_of_platform_populate(&pdev->dev); |
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} |
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static const struct of_device_id pm8916_pon_id_table[] = { |
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{ .compatible = "qcom,pm8916-pon", .data = (void *)GEN1_REASON_SHIFT }, |
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{ .compatible = "qcom,pms405-pon", .data = (void *)GEN1_REASON_SHIFT }, |
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{ .compatible = "qcom,pm8998-pon", .data = (void *)GEN2_REASON_SHIFT }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, pm8916_pon_id_table); |
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static struct platform_driver pm8916_pon_driver = { |
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.probe = pm8916_pon_probe, |
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.driver = { |
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.name = "pm8916-pon", |
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.of_match_table = of_match_ptr(pm8916_pon_id_table), |
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}, |
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}; |
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module_platform_driver(pm8916_pon_driver); |
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MODULE_DESCRIPTION("pm8916 Power On driver"); |
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MODULE_LICENSE("GPL v2");
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