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175 lines
4.3 KiB
175 lines
4.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Gemini power management controller |
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* Copyright (C) 2017 Linus Walleij <[email protected]> |
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* |
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* Inspired by code from the SL3516 board support by Jason Lee |
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* Inspired by code from Janos Laube <[email protected]> |
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*/ |
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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/pm.h> |
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#include <linux/bitops.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/reboot.h> |
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#define GEMINI_PWC_ID 0x00010500 |
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#define GEMINI_PWC_IDREG 0x00 |
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#define GEMINI_PWC_CTRLREG 0x04 |
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#define GEMINI_PWC_STATREG 0x08 |
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#define GEMINI_CTRL_SHUTDOWN BIT(0) |
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#define GEMINI_CTRL_ENABLE BIT(1) |
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#define GEMINI_CTRL_IRQ_CLR BIT(2) |
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#define GEMINI_STAT_CIR BIT(4) |
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#define GEMINI_STAT_RTC BIT(5) |
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#define GEMINI_STAT_POWERBUTTON BIT(6) |
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struct gemini_powercon { |
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struct device *dev; |
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void __iomem *base; |
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}; |
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static irqreturn_t gemini_powerbutton_interrupt(int irq, void *data) |
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{ |
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struct gemini_powercon *gpw = data; |
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u32 val; |
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/* ACK the IRQ */ |
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val = readl(gpw->base + GEMINI_PWC_CTRLREG); |
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val |= GEMINI_CTRL_IRQ_CLR; |
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writel(val, gpw->base + GEMINI_PWC_CTRLREG); |
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val = readl(gpw->base + GEMINI_PWC_STATREG); |
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val &= 0x70U; |
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switch (val) { |
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case GEMINI_STAT_CIR: |
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/* |
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* We do not yet have a driver for the infrared |
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* controller so it can cause spurious poweroff |
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* events. Ignore those for now. |
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*/ |
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dev_info(gpw->dev, "infrared poweroff - ignored\n"); |
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break; |
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case GEMINI_STAT_RTC: |
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dev_info(gpw->dev, "RTC poweroff\n"); |
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orderly_poweroff(true); |
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break; |
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case GEMINI_STAT_POWERBUTTON: |
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dev_info(gpw->dev, "poweroff button pressed\n"); |
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orderly_poweroff(true); |
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break; |
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default: |
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dev_info(gpw->dev, "other power management IRQ\n"); |
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break; |
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} |
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return IRQ_HANDLED; |
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} |
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/* This callback needs this static local as it has void as argument */ |
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static struct gemini_powercon *gpw_poweroff; |
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static void gemini_poweroff(void) |
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{ |
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struct gemini_powercon *gpw = gpw_poweroff; |
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u32 val; |
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dev_crit(gpw->dev, "Gemini power off\n"); |
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val = readl(gpw->base + GEMINI_PWC_CTRLREG); |
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val |= GEMINI_CTRL_ENABLE | GEMINI_CTRL_IRQ_CLR; |
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writel(val, gpw->base + GEMINI_PWC_CTRLREG); |
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val &= ~GEMINI_CTRL_ENABLE; |
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val |= GEMINI_CTRL_SHUTDOWN; |
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writel(val, gpw->base + GEMINI_PWC_CTRLREG); |
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} |
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static int gemini_poweroff_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct resource *res; |
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struct gemini_powercon *gpw; |
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u32 val; |
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int irq; |
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int ret; |
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gpw = devm_kzalloc(dev, sizeof(*gpw), GFP_KERNEL); |
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if (!gpw) |
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return -ENOMEM; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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gpw->base = devm_ioremap_resource(dev, res); |
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if (IS_ERR(gpw->base)) |
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return PTR_ERR(gpw->base); |
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irq = platform_get_irq(pdev, 0); |
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if (!irq) |
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return -EINVAL; |
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gpw->dev = dev; |
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val = readl(gpw->base + GEMINI_PWC_IDREG); |
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val &= 0xFFFFFF00U; |
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if (val != GEMINI_PWC_ID) { |
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dev_err(dev, "wrong power controller ID: %08x\n", |
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val); |
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return -ENODEV; |
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} |
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/* |
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* Enable the power controller. This is crucial on Gemini |
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* systems: if this is not done, pressing the power button |
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* will result in unconditional poweroff without any warning. |
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* This makes the kernel handle the poweroff. |
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*/ |
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val = readl(gpw->base + GEMINI_PWC_CTRLREG); |
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val |= GEMINI_CTRL_ENABLE; |
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writel(val, gpw->base + GEMINI_PWC_CTRLREG); |
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/* Clear the IRQ */ |
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val = readl(gpw->base + GEMINI_PWC_CTRLREG); |
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val |= GEMINI_CTRL_IRQ_CLR; |
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writel(val, gpw->base + GEMINI_PWC_CTRLREG); |
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/* Wait for this to clear */ |
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val = readl(gpw->base + GEMINI_PWC_STATREG); |
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while (val & 0x70U) |
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val = readl(gpw->base + GEMINI_PWC_STATREG); |
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/* Clear the IRQ again */ |
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val = readl(gpw->base + GEMINI_PWC_CTRLREG); |
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val |= GEMINI_CTRL_IRQ_CLR; |
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writel(val, gpw->base + GEMINI_PWC_CTRLREG); |
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ret = devm_request_irq(dev, irq, gemini_powerbutton_interrupt, 0, |
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"poweroff", gpw); |
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if (ret) |
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return ret; |
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pm_power_off = gemini_poweroff; |
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gpw_poweroff = gpw; |
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dev_info(dev, "Gemini poweroff driver registered\n"); |
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return 0; |
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} |
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static const struct of_device_id gemini_poweroff_of_match[] = { |
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{ |
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.compatible = "cortina,gemini-power-controller", |
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}, |
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{} |
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}; |
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static struct platform_driver gemini_poweroff_driver = { |
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.probe = gemini_poweroff_probe, |
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.driver = { |
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.name = "gemini-poweroff", |
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.of_match_table = gemini_poweroff_of_match, |
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}, |
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}; |
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builtin_platform_driver(gemini_poweroff_driver);
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