forked from Minki/linux
watchdog: simatic-ipc-wdt: add new driver for Siemens Industrial PCs
This driver adds initial support for several devices from Siemens. It is based on a platform driver introduced in an earlier commit. One of the supported machines does access a GPIO pin to enable the watchdog. Here we poke GPIO memory because pinctrl does not come up. Signed-off-by: Henning Schild <henning.schild@siemens.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20211213120502.20661-4-henning.schild@siemens.com Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Henning Schild
Hans de Goede
parent
8c78e0614e
commit
2ebd32ce2a
@ -1589,6 +1589,17 @@ config NIC7018_WDT
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To compile this driver as a module, choose M here: the module will be
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called nic7018_wdt.
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config SIEMENS_SIMATIC_IPC_WDT
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tristate "Siemens Simatic IPC Watchdog"
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depends on SIEMENS_SIMATIC_IPC
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select WATCHDOG_CORE
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help
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This driver adds support for several watchdogs found in Industrial
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PCs from Siemens.
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To compile this driver as a module, choose M here: the module will be
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called simatic-ipc-wdt.
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# M68K Architecture
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config M54xx_WATCHDOG
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@ -143,6 +143,7 @@ obj-$(CONFIG_NI903X_WDT) += ni903x_wdt.o
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obj-$(CONFIG_NIC7018_WDT) += nic7018_wdt.o
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obj-$(CONFIG_MLX_WDT) += mlx_wdt.o
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obj-$(CONFIG_KEEMBAY_WATCHDOG) += keembay_wdt.o
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obj-$(CONFIG_SIEMENS_SIMATIC_IPC_WDT) += simatic-ipc-wdt.o
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# M68K Architecture
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obj-$(CONFIG_M54xx_WATCHDOG) += m54xx_wdt.o
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228
drivers/watchdog/simatic-ipc-wdt.c
Normal file
228
drivers/watchdog/simatic-ipc-wdt.c
Normal file
@ -0,0 +1,228 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Siemens SIMATIC IPC driver for Watchdogs
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*
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* Copyright (c) Siemens AG, 2020-2021
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*
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* Authors:
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* Gerd Haeussler <gerd.haeussler.ext@siemens.com>
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*/
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/platform_data/x86/simatic-ipc-base.h>
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#include <linux/platform_device.h>
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#include <linux/sizes.h>
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#include <linux/util_macros.h>
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#include <linux/watchdog.h>
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#define WD_ENABLE_IOADR 0x62
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#define WD_TRIGGER_IOADR 0x66
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#define GPIO_COMMUNITY0_PORT_ID 0xaf
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#define PAD_CFG_DW0_GPP_A_23 0x4b8
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#define SAFE_EN_N_427E 0x01
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#define SAFE_EN_N_227E 0x04
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#define WD_ENABLED 0x01
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#define WD_TRIGGERED 0x80
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#define WD_MACROMODE 0x02
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#define TIMEOUT_MIN 2
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#define TIMEOUT_DEF 64
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#define TIMEOUT_MAX 64
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#define GP_STATUS_REG_227E 0x404D /* IO PORT for SAFE_EN_N on 227E */
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0000);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static struct resource gp_status_reg_227e_res =
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DEFINE_RES_IO_NAMED(GP_STATUS_REG_227E, SZ_1, KBUILD_MODNAME);
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static struct resource io_resource_enable =
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DEFINE_RES_IO_NAMED(WD_ENABLE_IOADR, SZ_1,
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KBUILD_MODNAME " WD_ENABLE_IOADR");
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static struct resource io_resource_trigger =
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DEFINE_RES_IO_NAMED(WD_TRIGGER_IOADR, SZ_1,
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KBUILD_MODNAME " WD_TRIGGER_IOADR");
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/* the actual start will be discovered with pci, 0 is a placeholder */
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static struct resource mem_resource =
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DEFINE_RES_MEM_NAMED(0, SZ_4, "WD_RESET_BASE_ADR");
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static u32 wd_timeout_table[] = {2, 4, 6, 8, 16, 32, 48, 64 };
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static void __iomem *wd_reset_base_addr;
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static int wd_start(struct watchdog_device *wdd)
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{
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outb(inb(WD_ENABLE_IOADR) | WD_ENABLED, WD_ENABLE_IOADR);
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return 0;
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}
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static int wd_stop(struct watchdog_device *wdd)
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{
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outb(inb(WD_ENABLE_IOADR) & ~WD_ENABLED, WD_ENABLE_IOADR);
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return 0;
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}
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static int wd_ping(struct watchdog_device *wdd)
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{
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inb(WD_TRIGGER_IOADR);
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return 0;
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}
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static int wd_set_timeout(struct watchdog_device *wdd, unsigned int t)
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{
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int timeout_idx = find_closest(t, wd_timeout_table,
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ARRAY_SIZE(wd_timeout_table));
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outb((inb(WD_ENABLE_IOADR) & 0xc7) | timeout_idx << 3, WD_ENABLE_IOADR);
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wdd->timeout = wd_timeout_table[timeout_idx];
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return 0;
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}
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static const struct watchdog_info wdt_ident = {
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.options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING |
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WDIOF_SETTIMEOUT,
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.identity = KBUILD_MODNAME,
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};
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static const struct watchdog_ops wdt_ops = {
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.owner = THIS_MODULE,
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.start = wd_start,
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.stop = wd_stop,
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.ping = wd_ping,
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.set_timeout = wd_set_timeout,
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};
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static void wd_secondary_enable(u32 wdtmode)
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{
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u16 resetbit;
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/* set safe_en_n so we are not just WDIOF_ALARMONLY */
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if (wdtmode == SIMATIC_IPC_DEVICE_227E) {
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/* enable SAFE_EN_N on GP_STATUS_REG_227E */
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resetbit = inb(GP_STATUS_REG_227E);
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outb(resetbit & ~SAFE_EN_N_227E, GP_STATUS_REG_227E);
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} else {
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/* enable SAFE_EN_N on PCH D1600 */
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resetbit = ioread16(wd_reset_base_addr);
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iowrite16(resetbit & ~SAFE_EN_N_427E, wd_reset_base_addr);
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}
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}
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static int wd_setup(u32 wdtmode)
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{
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unsigned int bootstatus = 0;
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int timeout_idx;
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timeout_idx = find_closest(TIMEOUT_DEF, wd_timeout_table,
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ARRAY_SIZE(wd_timeout_table));
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if (inb(WD_ENABLE_IOADR) & WD_TRIGGERED)
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bootstatus |= WDIOF_CARDRESET;
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/* reset alarm bit, set macro mode, and set timeout */
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outb(WD_TRIGGERED | WD_MACROMODE | timeout_idx << 3, WD_ENABLE_IOADR);
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wd_secondary_enable(wdtmode);
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return bootstatus;
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}
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static struct watchdog_device wdd_data = {
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.info = &wdt_ident,
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.ops = &wdt_ops,
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.min_timeout = TIMEOUT_MIN,
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.max_timeout = TIMEOUT_MAX
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};
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static int simatic_ipc_wdt_probe(struct platform_device *pdev)
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{
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struct simatic_ipc_platform *plat = pdev->dev.platform_data;
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struct device *dev = &pdev->dev;
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struct resource *res;
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switch (plat->devmode) {
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case SIMATIC_IPC_DEVICE_227E:
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if (!devm_request_region(dev, gp_status_reg_227e_res.start,
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resource_size(&gp_status_reg_227e_res),
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KBUILD_MODNAME)) {
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dev_err(dev,
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"Unable to register IO resource at %pR\n",
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&gp_status_reg_227e_res);
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return -EBUSY;
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}
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fallthrough;
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case SIMATIC_IPC_DEVICE_427E:
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wdd_data.parent = dev;
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break;
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default:
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return -EINVAL;
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}
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if (!devm_request_region(dev, io_resource_enable.start,
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resource_size(&io_resource_enable),
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io_resource_enable.name)) {
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dev_err(dev,
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"Unable to register IO resource at %#x\n",
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WD_ENABLE_IOADR);
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return -EBUSY;
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}
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if (!devm_request_region(dev, io_resource_trigger.start,
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resource_size(&io_resource_trigger),
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io_resource_trigger.name)) {
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dev_err(dev,
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"Unable to register IO resource at %#x\n",
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WD_TRIGGER_IOADR);
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return -EBUSY;
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}
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if (plat->devmode == SIMATIC_IPC_DEVICE_427E) {
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res = &mem_resource;
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/* get GPIO base from PCI */
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res->start = simatic_ipc_get_membase0(PCI_DEVFN(0x1f, 1));
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if (res->start == 0)
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return -ENODEV;
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/* do the final address calculation */
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res->start = res->start + (GPIO_COMMUNITY0_PORT_ID << 16) +
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PAD_CFG_DW0_GPP_A_23;
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res->end += res->start;
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wd_reset_base_addr = devm_ioremap_resource(dev, res);
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if (IS_ERR(wd_reset_base_addr))
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return PTR_ERR(wd_reset_base_addr);
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}
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wdd_data.bootstatus = wd_setup(plat->devmode);
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if (wdd_data.bootstatus)
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dev_warn(dev, "last reboot caused by watchdog reset\n");
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watchdog_set_nowayout(&wdd_data, nowayout);
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watchdog_stop_on_reboot(&wdd_data);
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return devm_watchdog_register_device(dev, &wdd_data);
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}
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static struct platform_driver simatic_ipc_wdt_driver = {
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.probe = simatic_ipc_wdt_probe,
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.driver = {
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.name = KBUILD_MODNAME,
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},
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};
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module_platform_driver(simatic_ipc_wdt_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:" KBUILD_MODNAME);
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MODULE_AUTHOR("Gerd Haeussler <gerd.haeussler.ext@siemens.com>");
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