^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * QNAP Turbo NAS Board power off. Can also be used on Synology devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2012 Andrew Lunn <andrew@lunn.ch>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Based on the code from:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Copyright (C) 2009 Martin Michlmayr <tbm@cyrius.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Copyright (C) 2008 Byron Bradley <byron.bbradley@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/serial_reg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/kallsyms.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define UART1_REG(x) (base + ((UART_##x) << 2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct power_off_cfg {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) u32 baud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) char cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static const struct power_off_cfg qnap_power_off_cfg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) .baud = 19200,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) .cmd = 'A',
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static const struct power_off_cfg synology_power_off_cfg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) .baud = 9600,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) .cmd = '1',
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static const struct of_device_id qnap_power_off_of_match_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) { .compatible = "qnap,power-off",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) .data = &qnap_power_off_cfg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) { .compatible = "synology,power-off",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) .data = &synology_power_off_cfg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) MODULE_DEVICE_TABLE(of, qnap_power_off_of_match_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static unsigned long tclk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static const struct power_off_cfg *cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static void qnap_power_off(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) const unsigned divisor = ((tclk + (8 * cfg->baud)) / (16 * cfg->baud));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) pr_err("%s: triggering power-off...\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) /* hijack UART1 and reset into sane state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) writel(0x83, UART1_REG(LCR));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) writel(divisor & 0xff, UART1_REG(DLL));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) writel((divisor >> 8) & 0xff, UART1_REG(DLM));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) writel(0x03, UART1_REG(LCR));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) writel(0x00, UART1_REG(IER));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) writel(0x00, UART1_REG(FCR));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) writel(0x00, UART1_REG(MCR));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /* send the power-off command to PIC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) writel(cfg->cmd, UART1_REG(TX));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static int qnap_power_off_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct device_node *np = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) struct resource *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct clk *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) char symname[KSYM_NAME_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) const struct of_device_id *match =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) of_match_node(qnap_power_off_of_match_table, np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) cfg = match->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (!res) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) dev_err(&pdev->dev, "Missing resource");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (!base) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) dev_err(&pdev->dev, "Unable to map resource");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) /* We need to know tclk in order to calculate the UART divisor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) clk = devm_clk_get(&pdev->dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (IS_ERR(clk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) dev_err(&pdev->dev, "Clk missing");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return PTR_ERR(clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) tclk = clk_get_rate(clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /* Check that nothing else has already setup a handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (pm_power_off) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) lookup_symbol_name((ulong)pm_power_off, symname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) dev_err(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) "pm_power_off already claimed %p %s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) pm_power_off, symname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) pm_power_off = qnap_power_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static int qnap_power_off_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) pm_power_off = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static struct platform_driver qnap_power_off_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) .probe = qnap_power_off_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) .remove = qnap_power_off_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) .name = "qnap_power_off",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) .of_match_table = of_match_ptr(qnap_power_off_of_match_table),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) module_platform_driver(qnap_power_off_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) MODULE_DESCRIPTION("QNAP Power off driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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