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132 lines
3.1 KiB
132 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* QNAP Turbo NAS Board power off. Can also be used on Synology devices. |
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* |
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* Copyright (C) 2012 Andrew Lunn <[email protected]> |
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* |
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* Based on the code from: |
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* |
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* Copyright (C) 2009 Martin Michlmayr <[email protected]> |
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* Copyright (C) 2008 Byron Bradley <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/serial_reg.h> |
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#include <linux/of.h> |
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#include <linux/io.h> |
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#include <linux/clk.h> |
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#define UART1_REG(x) (base + ((UART_##x) << 2)) |
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struct power_off_cfg { |
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u32 baud; |
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char cmd; |
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}; |
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static const struct power_off_cfg qnap_power_off_cfg = { |
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.baud = 19200, |
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.cmd = 'A', |
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}; |
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static const struct power_off_cfg synology_power_off_cfg = { |
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.baud = 9600, |
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.cmd = '1', |
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}; |
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static const struct of_device_id qnap_power_off_of_match_table[] = { |
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{ .compatible = "qnap,power-off", |
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.data = &qnap_power_off_cfg, |
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}, |
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{ .compatible = "synology,power-off", |
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.data = &synology_power_off_cfg, |
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}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, qnap_power_off_of_match_table); |
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static void __iomem *base; |
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static unsigned long tclk; |
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static const struct power_off_cfg *cfg; |
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static void qnap_power_off(void) |
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{ |
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const unsigned divisor = ((tclk + (8 * cfg->baud)) / (16 * cfg->baud)); |
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pr_err("%s: triggering power-off...\n", __func__); |
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/* hijack UART1 and reset into sane state */ |
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writel(0x83, UART1_REG(LCR)); |
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writel(divisor & 0xff, UART1_REG(DLL)); |
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writel((divisor >> 8) & 0xff, UART1_REG(DLM)); |
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writel(0x03, UART1_REG(LCR)); |
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writel(0x00, UART1_REG(IER)); |
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writel(0x00, UART1_REG(FCR)); |
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writel(0x00, UART1_REG(MCR)); |
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/* send the power-off command to PIC */ |
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writel(cfg->cmd, UART1_REG(TX)); |
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} |
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static int qnap_power_off_probe(struct platform_device *pdev) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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struct resource *res; |
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struct clk *clk; |
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const struct of_device_id *match = |
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of_match_node(qnap_power_off_of_match_table, np); |
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cfg = match->data; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!res) { |
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dev_err(&pdev->dev, "Missing resource"); |
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return -EINVAL; |
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} |
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base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); |
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if (!base) { |
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dev_err(&pdev->dev, "Unable to map resource"); |
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return -EINVAL; |
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} |
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/* We need to know tclk in order to calculate the UART divisor */ |
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clk = devm_clk_get(&pdev->dev, NULL); |
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if (IS_ERR(clk)) { |
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dev_err(&pdev->dev, "Clk missing"); |
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return PTR_ERR(clk); |
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} |
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tclk = clk_get_rate(clk); |
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/* Check that nothing else has already setup a handler */ |
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if (pm_power_off) { |
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dev_err(&pdev->dev, "pm_power_off already claimed for %ps", |
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pm_power_off); |
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return -EBUSY; |
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} |
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pm_power_off = qnap_power_off; |
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return 0; |
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} |
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static int qnap_power_off_remove(struct platform_device *pdev) |
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{ |
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pm_power_off = NULL; |
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return 0; |
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} |
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static struct platform_driver qnap_power_off_driver = { |
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.probe = qnap_power_off_probe, |
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.remove = qnap_power_off_remove, |
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.driver = { |
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.name = "qnap_power_off", |
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.of_match_table = of_match_ptr(qnap_power_off_of_match_table), |
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}, |
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}; |
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module_platform_driver(qnap_power_off_driver); |
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MODULE_AUTHOR("Andrew Lunn <[email protected]>"); |
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MODULE_DESCRIPTION("QNAP Power off driver"); |
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MODULE_LICENSE("GPL v2");
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