| Message ID | 20210315095710.7140-4-henning.schild@siemens.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | add device drivers for Siemens Industrial PCs | expand |
On 3/15/21 2:57 AM, Henning Schild wrote: > This driver adds initial support for several devices from Siemens. It is > based on a platform driver introduced in an earlier commit. > > Signed-off-by: Henning Schild <henning.schild@siemens.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> > --- > drivers/watchdog/Kconfig | 11 ++ > drivers/watchdog/Makefile | 1 + > drivers/watchdog/simatic-ipc-wdt.c | 215 +++++++++++++++++++++++++++++ > 3 files changed, 227 insertions(+) > create mode 100644 drivers/watchdog/simatic-ipc-wdt.c > > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig > index 1fe0042a48d2..948497eb4bef 100644 > --- a/drivers/watchdog/Kconfig > +++ b/drivers/watchdog/Kconfig > @@ -1575,6 +1575,17 @@ config NIC7018_WDT > To compile this driver as a module, choose M here: the module will be > called nic7018_wdt. > > +config SIEMENS_SIMATIC_IPC_WDT > + tristate "Siemens Simatic IPC Watchdog" > + depends on SIEMENS_SIMATIC_IPC > + select WATCHDOG_CORE > + help > + This driver adds support for several watchdogs found in Industrial > + PCs from Siemens. > + > + To compile this driver as a module, choose M here: the module will be > + called simatic-ipc-wdt. > + > # M68K Architecture > > config M54xx_WATCHDOG > diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile > index f3a6540e725e..7f5c73ec058c 100644 > --- a/drivers/watchdog/Makefile > +++ b/drivers/watchdog/Makefile > @@ -142,6 +142,7 @@ obj-$(CONFIG_NI903X_WDT) += ni903x_wdt.o > obj-$(CONFIG_NIC7018_WDT) += nic7018_wdt.o > obj-$(CONFIG_MLX_WDT) += mlx_wdt.o > obj-$(CONFIG_KEEMBAY_WATCHDOG) += keembay_wdt.o > +obj-$(CONFIG_SIEMENS_SIMATIC_IPC_WDT) += simatic-ipc-wdt.o > > # M68K Architecture > obj-$(CONFIG_M54xx_WATCHDOG) += m54xx_wdt.o > diff --git a/drivers/watchdog/simatic-ipc-wdt.c b/drivers/watchdog/simatic-ipc-wdt.c > new file mode 100644 > index 000000000000..f0f948968db3 > --- /dev/null > +++ b/drivers/watchdog/simatic-ipc-wdt.c > @@ -0,0 +1,215 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Siemens SIMATIC IPC driver for Watchdogs > + * > + * Copyright (c) Siemens AG, 2020-2021 > + * > + * Authors: > + * Gerd Haeussler <gerd.haeussler.ext@siemens.com> > + */ > + > +#include <linux/device.h> > +#include <linux/errno.h> > +#include <linux/init.h> > +#include <linux/io.h> > +#include <linux/ioport.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/pci.h> > +#include <linux/platform_data/x86/simatic-ipc-base.h> > +#include <linux/platform_device.h> > +#include <linux/sizes.h> > +#include <linux/util_macros.h> > +#include <linux/watchdog.h> > + > +#define WD_ENABLE_IOADR 0x62 > +#define WD_TRIGGER_IOADR 0x66 > +#define GPIO_COMMUNITY0_PORT_ID 0xaf > +#define PAD_CFG_DW0_GPP_A_23 0x4b8 > +#define SAFE_EN_N_427E 0x01 > +#define SAFE_EN_N_227E 0x04 > +#define WD_ENABLED 0x01 > +#define WD_TRIGGERED 0x80 > +#define WD_MACROMODE 0x02 > + > +#define TIMEOUT_MIN 2 > +#define TIMEOUT_DEF 64 > +#define TIMEOUT_MAX 64 > + > +#define GP_STATUS_REG_227E 0x404D /* IO PORT for SAFE_EN_N on 227E */ > + > +static bool nowayout = WATCHDOG_NOWAYOUT; > +module_param(nowayout, bool, 0000); > +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" > + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); > + > +static struct resource gp_status_reg_227e_res = > + DEFINE_RES_IO_NAMED(GP_STATUS_REG_227E, SZ_1, KBUILD_MODNAME); > + > +static struct resource io_resource = > + DEFINE_RES_IO_NAMED(WD_ENABLE_IOADR, SZ_1, > + KBUILD_MODNAME " WD_ENABLE_IOADR"); > + > +/* the actual start will be discovered with pci, 0 is a placeholder */ > +static struct resource mem_resource = > + DEFINE_RES_MEM_NAMED(0, SZ_4, "WD_RESET_BASE_ADR"); > + > +static u32 wd_timeout_table[] = {2, 4, 6, 8, 16, 32, 48, 64 }; > +static void __iomem *wd_reset_base_addr; > + > +static int wd_start(struct watchdog_device *wdd) > +{ > + outb(inb(WD_ENABLE_IOADR) | WD_ENABLED, WD_ENABLE_IOADR); > + return 0; > +} > + > +static int wd_stop(struct watchdog_device *wdd) > +{ > + outb(inb(WD_ENABLE_IOADR) & ~WD_ENABLED, WD_ENABLE_IOADR); > + return 0; > +} > + > +static int wd_ping(struct watchdog_device *wdd) > +{ > + inb(WD_TRIGGER_IOADR); > + return 0; > +} > + > +static int wd_set_timeout(struct watchdog_device *wdd, unsigned int t) > +{ > + int timeout_idx = find_closest(t, wd_timeout_table, > + ARRAY_SIZE(wd_timeout_table)); > + > + outb((inb(WD_ENABLE_IOADR) & 0xc7) | timeout_idx << 3, WD_ENABLE_IOADR); > + wdd->timeout = wd_timeout_table[timeout_idx]; > + return 0; > +} > + > +static const struct watchdog_info wdt_ident = { > + .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | > + WDIOF_SETTIMEOUT, > + .identity = KBUILD_MODNAME, > +}; > + > +static const struct watchdog_ops wdt_ops = { > + .owner = THIS_MODULE, > + .start = wd_start, > + .stop = wd_stop, > + .ping = wd_ping, > + .set_timeout = wd_set_timeout, > +}; > + > +static void wd_secondary_enable(u32 wdtmode) > +{ > + u16 resetbit; > + > + /* set safe_en_n so we are not just WDIOF_ALARMONLY */ > + if (wdtmode == SIMATIC_IPC_DEVICE_227E) { > + /* enable SAFE_EN_N on GP_STATUS_REG_227E */ > + resetbit = inw(GP_STATUS_REG_227E); > + outw(resetbit & ~SAFE_EN_N_227E, GP_STATUS_REG_227E); > + } else { > + /* enable SAFE_EN_N on PCH D1600 */ > + resetbit = ioread16(wd_reset_base_addr); > + iowrite16(resetbit & ~SAFE_EN_N_427E, wd_reset_base_addr); > + } > +} > + > +static int wd_setup(u32 wdtmode) > +{ > + unsigned int bootstatus = 0; > + int timeout_idx; > + > + timeout_idx = find_closest(TIMEOUT_DEF, wd_timeout_table, > + ARRAY_SIZE(wd_timeout_table)); > + > + if (inb(WD_ENABLE_IOADR) & WD_TRIGGERED) > + bootstatus |= WDIOF_CARDRESET; > + > + /* reset alarm bit, set macro mode, and set timeout */ > + outb(WD_TRIGGERED | WD_MACROMODE | timeout_idx << 3, WD_ENABLE_IOADR); > + > + wd_secondary_enable(wdtmode); > + > + return bootstatus; > +} > + > +static struct watchdog_device wdd_data = { > + .info = &wdt_ident, > + .ops = &wdt_ops, > + .min_timeout = TIMEOUT_MIN, > + .max_timeout = TIMEOUT_MAX > +}; > + > +static int simatic_ipc_wdt_probe(struct platform_device *pdev) > +{ > + struct simatic_ipc_platform *plat = pdev->dev.platform_data; > + struct device *dev = &pdev->dev; > + struct resource *res; > + > + switch (plat->devmode) { > + case SIMATIC_IPC_DEVICE_227E: > + if (!devm_request_region(dev, gp_status_reg_227e_res.start, > + resource_size(&gp_status_reg_227e_res), > + KBUILD_MODNAME)) { > + dev_err(dev, > + "Unable to register IO resource at %pR\n", > + &gp_status_reg_227e_res); > + return -EBUSY; > + } > + fallthrough; > + case SIMATIC_IPC_DEVICE_427E: > + wdd_data.parent = dev; > + break; > + default: > + return -EINVAL; > + } > + > + if (!devm_request_region(dev, io_resource.start, > + resource_size(&io_resource), > + io_resource.name)) { > + dev_err(dev, > + "Unable to register IO resource at %#x\n", > + WD_ENABLE_IOADR); > + return -EBUSY; > + } > + > + if (plat->devmode == SIMATIC_IPC_DEVICE_427E) { > + res = &mem_resource; > + > + /* get GPIO base from PCI */ > + res->start = simatic_ipc_get_membase0(PCI_DEVFN(0x1f, 1)); > + if (res->start == 0) > + return -ENODEV; > + > + /* do the final address calculation */ > + res->start = res->start + (GPIO_COMMUNITY0_PORT_ID << 16) + > + PAD_CFG_DW0_GPP_A_23; > + res->end += res->start; > + > + wd_reset_base_addr = devm_ioremap_resource(dev, res); > + if (IS_ERR(wd_reset_base_addr)) > + return PTR_ERR(wd_reset_base_addr); > + } > + > + wdd_data.bootstatus = wd_setup(plat->devmode); > + if (wdd_data.bootstatus) > + dev_warn(dev, "last reboot caused by watchdog reset\n"); > + > + watchdog_set_nowayout(&wdd_data, nowayout); > + watchdog_stop_on_reboot(&wdd_data); > + return devm_watchdog_register_device(dev, &wdd_data); > +} > + > +static struct platform_driver wdt_driver = { > + .probe = simatic_ipc_wdt_probe, > + .driver = { > + .name = KBUILD_MODNAME, > + }, > +}; > + > +module_platform_driver(wdt_driver); > + > +MODULE_LICENSE("GPL v2"); > +MODULE_ALIAS("platform:" KBUILD_MODNAME); > +MODULE_AUTHOR("Gerd Haeussler <gerd.haeussler.ext@siemens.com>"); >
Am Mon, 15 Mar 2021 08:10:25 -0700 schrieb Guenter Roeck <linux@roeck-us.net>: > On 3/15/21 2:57 AM, Henning Schild wrote: > > This driver adds initial support for several devices from Siemens. > > It is based on a platform driver introduced in an earlier commit. > > > > Signed-off-by: Henning Schild <henning.schild@siemens.com> > > Reviewed-by: Guenter Roeck <linux@roeck-us.net> I assume that means i should insert this into v3, will do. The diff between v2 and v3 is only going to be a name change -module_platform_driver(wdt_driver); +module_platform_driver(simatic_ipc_wdt_driver); Henning > > --- > > drivers/watchdog/Kconfig | 11 ++ > > drivers/watchdog/Makefile | 1 + > > drivers/watchdog/simatic-ipc-wdt.c | 215 > > +++++++++++++++++++++++++++++ 3 files changed, 227 insertions(+) > > create mode 100644 drivers/watchdog/simatic-ipc-wdt.c > > > > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig > > index 1fe0042a48d2..948497eb4bef 100644 > > --- a/drivers/watchdog/Kconfig > > +++ b/drivers/watchdog/Kconfig > > @@ -1575,6 +1575,17 @@ config NIC7018_WDT > > To compile this driver as a module, choose M here: the > > module will be called nic7018_wdt. > > > > +config SIEMENS_SIMATIC_IPC_WDT > > + tristate "Siemens Simatic IPC Watchdog" > > + depends on SIEMENS_SIMATIC_IPC > > + select WATCHDOG_CORE > > + help > > + This driver adds support for several watchdogs found in > > Industrial > > + PCs from Siemens. > > + > > + To compile this driver as a module, choose M here: the > > module will be > > + called simatic-ipc-wdt. > > + > > # M68K Architecture > > > > config M54xx_WATCHDOG > > diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile > > index f3a6540e725e..7f5c73ec058c 100644 > > --- a/drivers/watchdog/Makefile > > +++ b/drivers/watchdog/Makefile > > @@ -142,6 +142,7 @@ obj-$(CONFIG_NI903X_WDT) += ni903x_wdt.o > > obj-$(CONFIG_NIC7018_WDT) += nic7018_wdt.o > > obj-$(CONFIG_MLX_WDT) += mlx_wdt.o > > obj-$(CONFIG_KEEMBAY_WATCHDOG) += keembay_wdt.o > > +obj-$(CONFIG_SIEMENS_SIMATIC_IPC_WDT) += simatic-ipc-wdt.o > > > > # M68K Architecture > > obj-$(CONFIG_M54xx_WATCHDOG) += m54xx_wdt.o > > diff --git a/drivers/watchdog/simatic-ipc-wdt.c > > b/drivers/watchdog/simatic-ipc-wdt.c new file mode 100644 > > index 000000000000..f0f948968db3 > > --- /dev/null > > +++ b/drivers/watchdog/simatic-ipc-wdt.c > > @@ -0,0 +1,215 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * Siemens SIMATIC IPC driver for Watchdogs > > + * > > + * Copyright (c) Siemens AG, 2020-2021 > > + * > > + * Authors: > > + * Gerd Haeussler <gerd.haeussler.ext@siemens.com> > > + */ > > + > > +#include <linux/device.h> > > +#include <linux/errno.h> > > +#include <linux/init.h> > > +#include <linux/io.h> > > +#include <linux/ioport.h> > > +#include <linux/kernel.h> > > +#include <linux/module.h> > > +#include <linux/pci.h> > > +#include <linux/platform_data/x86/simatic-ipc-base.h> > > +#include <linux/platform_device.h> > > +#include <linux/sizes.h> > > +#include <linux/util_macros.h> > > +#include <linux/watchdog.h> > > + > > +#define WD_ENABLE_IOADR 0x62 > > +#define WD_TRIGGER_IOADR 0x66 > > +#define GPIO_COMMUNITY0_PORT_ID 0xaf > > +#define PAD_CFG_DW0_GPP_A_23 0x4b8 > > +#define SAFE_EN_N_427E 0x01 > > +#define SAFE_EN_N_227E 0x04 > > +#define WD_ENABLED 0x01 > > +#define WD_TRIGGERED 0x80 > > +#define WD_MACROMODE 0x02 > > + > > +#define TIMEOUT_MIN 2 > > +#define TIMEOUT_DEF 64 > > +#define TIMEOUT_MAX 64 > > + > > +#define GP_STATUS_REG_227E 0x404D /* IO PORT for > > SAFE_EN_N on 227E */ + > > +static bool nowayout = WATCHDOG_NOWAYOUT; > > +module_param(nowayout, bool, 0000); > > +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once > > started (default=" > > + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); > > + > > +static struct resource gp_status_reg_227e_res = > > + DEFINE_RES_IO_NAMED(GP_STATUS_REG_227E, SZ_1, > > KBUILD_MODNAME); + > > +static struct resource io_resource = > > + DEFINE_RES_IO_NAMED(WD_ENABLE_IOADR, SZ_1, > > + KBUILD_MODNAME " WD_ENABLE_IOADR"); > > + > > +/* the actual start will be discovered with pci, 0 is a > > placeholder */ +static struct resource mem_resource = > > + DEFINE_RES_MEM_NAMED(0, SZ_4, "WD_RESET_BASE_ADR"); > > + > > +static u32 wd_timeout_table[] = {2, 4, 6, 8, 16, 32, 48, 64 }; > > +static void __iomem *wd_reset_base_addr; > > + > > +static int wd_start(struct watchdog_device *wdd) > > +{ > > + outb(inb(WD_ENABLE_IOADR) | WD_ENABLED, WD_ENABLE_IOADR); > > + return 0; > > +} > > + > > +static int wd_stop(struct watchdog_device *wdd) > > +{ > > + outb(inb(WD_ENABLE_IOADR) & ~WD_ENABLED, WD_ENABLE_IOADR); > > + return 0; > > +} > > + > > +static int wd_ping(struct watchdog_device *wdd) > > +{ > > + inb(WD_TRIGGER_IOADR); > > + return 0; > > +} > > + > > +static int wd_set_timeout(struct watchdog_device *wdd, unsigned > > int t) +{ > > + int timeout_idx = find_closest(t, wd_timeout_table, > > + > > ARRAY_SIZE(wd_timeout_table)); + > > + outb((inb(WD_ENABLE_IOADR) & 0xc7) | timeout_idx << 3, > > WD_ENABLE_IOADR); > > + wdd->timeout = wd_timeout_table[timeout_idx]; > > + return 0; > > +} > > + > > +static const struct watchdog_info wdt_ident = { > > + .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | > > + WDIOF_SETTIMEOUT, > > + .identity = KBUILD_MODNAME, > > +}; > > + > > +static const struct watchdog_ops wdt_ops = { > > + .owner = THIS_MODULE, > > + .start = wd_start, > > + .stop = wd_stop, > > + .ping = wd_ping, > > + .set_timeout = wd_set_timeout, > > +}; > > + > > +static void wd_secondary_enable(u32 wdtmode) > > +{ > > + u16 resetbit; > > + > > + /* set safe_en_n so we are not just WDIOF_ALARMONLY */ > > + if (wdtmode == SIMATIC_IPC_DEVICE_227E) { > > + /* enable SAFE_EN_N on GP_STATUS_REG_227E */ > > + resetbit = inw(GP_STATUS_REG_227E); > > + outw(resetbit & ~SAFE_EN_N_227E, > > GP_STATUS_REG_227E); > > + } else { > > + /* enable SAFE_EN_N on PCH D1600 */ > > + resetbit = ioread16(wd_reset_base_addr); > > + iowrite16(resetbit & ~SAFE_EN_N_427E, > > wd_reset_base_addr); > > + } > > +} > > + > > +static int wd_setup(u32 wdtmode) > > +{ > > + unsigned int bootstatus = 0; > > + int timeout_idx; > > + > > + timeout_idx = find_closest(TIMEOUT_DEF, wd_timeout_table, > > + ARRAY_SIZE(wd_timeout_table)); > > + > > + if (inb(WD_ENABLE_IOADR) & WD_TRIGGERED) > > + bootstatus |= WDIOF_CARDRESET; > > + > > + /* reset alarm bit, set macro mode, and set timeout */ > > + outb(WD_TRIGGERED | WD_MACROMODE | timeout_idx << 3, > > WD_ENABLE_IOADR); + > > + wd_secondary_enable(wdtmode); > > + > > + return bootstatus; > > +} > > + > > +static struct watchdog_device wdd_data = { > > + .info = &wdt_ident, > > + .ops = &wdt_ops, > > + .min_timeout = TIMEOUT_MIN, > > + .max_timeout = TIMEOUT_MAX > > +}; > > + > > +static int simatic_ipc_wdt_probe(struct platform_device *pdev) > > +{ > > + struct simatic_ipc_platform *plat = > > pdev->dev.platform_data; > > + struct device *dev = &pdev->dev; > > + struct resource *res; > > + > > + switch (plat->devmode) { > > + case SIMATIC_IPC_DEVICE_227E: > > + if (!devm_request_region(dev, > > gp_status_reg_227e_res.start, > > + > > resource_size(&gp_status_reg_227e_res), > > + KBUILD_MODNAME)) { > > + dev_err(dev, > > + "Unable to register IO resource at > > %pR\n", > > + &gp_status_reg_227e_res); > > + return -EBUSY; > > + } > > + fallthrough; > > + case SIMATIC_IPC_DEVICE_427E: > > + wdd_data.parent = dev; > > + break; > > + default: > > + return -EINVAL; > > + } > > + > > + if (!devm_request_region(dev, io_resource.start, > > + resource_size(&io_resource), > > + io_resource.name)) { > > + dev_err(dev, > > + "Unable to register IO resource at %#x\n", > > + WD_ENABLE_IOADR); > > + return -EBUSY; > > + } > > + > > + if (plat->devmode == SIMATIC_IPC_DEVICE_427E) { > > + res = &mem_resource; > > + > > + /* get GPIO base from PCI */ > > + res->start = > > simatic_ipc_get_membase0(PCI_DEVFN(0x1f, 1)); > > + if (res->start == 0) > > + return -ENODEV; > > + > > + /* do the final address calculation */ > > + res->start = res->start + (GPIO_COMMUNITY0_PORT_ID > > << 16) + > > + PAD_CFG_DW0_GPP_A_23; > > + res->end += res->start; > > + > > + wd_reset_base_addr = devm_ioremap_resource(dev, > > res); > > + if (IS_ERR(wd_reset_base_addr)) > > + return PTR_ERR(wd_reset_base_addr); > > + } > > + > > + wdd_data.bootstatus = wd_setup(plat->devmode); > > + if (wdd_data.bootstatus) > > + dev_warn(dev, "last reboot caused by watchdog > > reset\n"); + > > + watchdog_set_nowayout(&wdd_data, nowayout); > > + watchdog_stop_on_reboot(&wdd_data); > > + return devm_watchdog_register_device(dev, &wdd_data); > > +} > > + > > +static struct platform_driver wdt_driver = { > > + .probe = simatic_ipc_wdt_probe, > > + .driver = { > > + .name = KBUILD_MODNAME, > > + }, > > +}; > > + > > +module_platform_driver(wdt_driver); > > + > > +MODULE_LICENSE("GPL v2"); > > +MODULE_ALIAS("platform:" KBUILD_MODNAME); > > +MODULE_AUTHOR("Gerd Haeussler <gerd.haeussler.ext@siemens.com>"); > > >
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 1fe0042a48d2..948497eb4bef 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -1575,6 +1575,17 @@ config NIC7018_WDT To compile this driver as a module, choose M here: the module will be called nic7018_wdt. +config SIEMENS_SIMATIC_IPC_WDT + tristate "Siemens Simatic IPC Watchdog" + depends on SIEMENS_SIMATIC_IPC + select WATCHDOG_CORE + help + This driver adds support for several watchdogs found in Industrial + PCs from Siemens. + + To compile this driver as a module, choose M here: the module will be + called simatic-ipc-wdt. + # M68K Architecture config M54xx_WATCHDOG diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index f3a6540e725e..7f5c73ec058c 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -142,6 +142,7 @@ obj-$(CONFIG_NI903X_WDT) += ni903x_wdt.o obj-$(CONFIG_NIC7018_WDT) += nic7018_wdt.o obj-$(CONFIG_MLX_WDT) += mlx_wdt.o obj-$(CONFIG_KEEMBAY_WATCHDOG) += keembay_wdt.o +obj-$(CONFIG_SIEMENS_SIMATIC_IPC_WDT) += simatic-ipc-wdt.o # M68K Architecture obj-$(CONFIG_M54xx_WATCHDOG) += m54xx_wdt.o diff --git a/drivers/watchdog/simatic-ipc-wdt.c b/drivers/watchdog/simatic-ipc-wdt.c new file mode 100644 index 000000000000..f0f948968db3 --- /dev/null +++ b/drivers/watchdog/simatic-ipc-wdt.c @@ -0,0 +1,215 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Siemens SIMATIC IPC driver for Watchdogs + * + * Copyright (c) Siemens AG, 2020-2021 + * + * Authors: + * Gerd Haeussler <gerd.haeussler.ext@siemens.com> + */ + +#include <linux/device.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/ioport.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/platform_data/x86/simatic-ipc-base.h> +#include <linux/platform_device.h> +#include <linux/sizes.h> +#include <linux/util_macros.h> +#include <linux/watchdog.h> + +#define WD_ENABLE_IOADR 0x62 +#define WD_TRIGGER_IOADR 0x66 +#define GPIO_COMMUNITY0_PORT_ID 0xaf +#define PAD_CFG_DW0_GPP_A_23 0x4b8 +#define SAFE_EN_N_427E 0x01 +#define SAFE_EN_N_227E 0x04 +#define WD_ENABLED 0x01 +#define WD_TRIGGERED 0x80 +#define WD_MACROMODE 0x02 + +#define TIMEOUT_MIN 2 +#define TIMEOUT_DEF 64 +#define TIMEOUT_MAX 64 + +#define GP_STATUS_REG_227E 0x404D /* IO PORT for SAFE_EN_N on 227E */ + +static bool nowayout = WATCHDOG_NOWAYOUT; +module_param(nowayout, bool, 0000); +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); + +static struct resource gp_status_reg_227e_res = + DEFINE_RES_IO_NAMED(GP_STATUS_REG_227E, SZ_1, KBUILD_MODNAME); + +static struct resource io_resource = + DEFINE_RES_IO_NAMED(WD_ENABLE_IOADR, SZ_1, + KBUILD_MODNAME " WD_ENABLE_IOADR"); + +/* the actual start will be discovered with pci, 0 is a placeholder */ +static struct resource mem_resource = + DEFINE_RES_MEM_NAMED(0, SZ_4, "WD_RESET_BASE_ADR"); + +static u32 wd_timeout_table[] = {2, 4, 6, 8, 16, 32, 48, 64 }; +static void __iomem *wd_reset_base_addr; + +static int wd_start(struct watchdog_device *wdd) +{ + outb(inb(WD_ENABLE_IOADR) | WD_ENABLED, WD_ENABLE_IOADR); + return 0; +} + +static int wd_stop(struct watchdog_device *wdd) +{ + outb(inb(WD_ENABLE_IOADR) & ~WD_ENABLED, WD_ENABLE_IOADR); + return 0; +} + +static int wd_ping(struct watchdog_device *wdd) +{ + inb(WD_TRIGGER_IOADR); + return 0; +} + +static int wd_set_timeout(struct watchdog_device *wdd, unsigned int t) +{ + int timeout_idx = find_closest(t, wd_timeout_table, + ARRAY_SIZE(wd_timeout_table)); + + outb((inb(WD_ENABLE_IOADR) & 0xc7) | timeout_idx << 3, WD_ENABLE_IOADR); + wdd->timeout = wd_timeout_table[timeout_idx]; + return 0; +} + +static const struct watchdog_info wdt_ident = { + .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | + WDIOF_SETTIMEOUT, + .identity = KBUILD_MODNAME, +}; + +static const struct watchdog_ops wdt_ops = { + .owner = THIS_MODULE, + .start = wd_start, + .stop = wd_stop, + .ping = wd_ping, + .set_timeout = wd_set_timeout, +}; + +static void wd_secondary_enable(u32 wdtmode) +{ + u16 resetbit; + + /* set safe_en_n so we are not just WDIOF_ALARMONLY */ + if (wdtmode == SIMATIC_IPC_DEVICE_227E) { + /* enable SAFE_EN_N on GP_STATUS_REG_227E */ + resetbit = inw(GP_STATUS_REG_227E); + outw(resetbit & ~SAFE_EN_N_227E, GP_STATUS_REG_227E); + } else { + /* enable SAFE_EN_N on PCH D1600 */ + resetbit = ioread16(wd_reset_base_addr); + iowrite16(resetbit & ~SAFE_EN_N_427E, wd_reset_base_addr); + } +} + +static int wd_setup(u32 wdtmode) +{ + unsigned int bootstatus = 0; + int timeout_idx; + + timeout_idx = find_closest(TIMEOUT_DEF, wd_timeout_table, + ARRAY_SIZE(wd_timeout_table)); + + if (inb(WD_ENABLE_IOADR) & WD_TRIGGERED) + bootstatus |= WDIOF_CARDRESET; + + /* reset alarm bit, set macro mode, and set timeout */ + outb(WD_TRIGGERED | WD_MACROMODE | timeout_idx << 3, WD_ENABLE_IOADR); + + wd_secondary_enable(wdtmode); + + return bootstatus; +} + +static struct watchdog_device wdd_data = { + .info = &wdt_ident, + .ops = &wdt_ops, + .min_timeout = TIMEOUT_MIN, + .max_timeout = TIMEOUT_MAX +}; + +static int simatic_ipc_wdt_probe(struct platform_device *pdev) +{ + struct simatic_ipc_platform *plat = pdev->dev.platform_data; + struct device *dev = &pdev->dev; + struct resource *res; + + switch (plat->devmode) { + case SIMATIC_IPC_DEVICE_227E: + if (!devm_request_region(dev, gp_status_reg_227e_res.start, + resource_size(&gp_status_reg_227e_res), + KBUILD_MODNAME)) { + dev_err(dev, + "Unable to register IO resource at %pR\n", + &gp_status_reg_227e_res); + return -EBUSY; + } + fallthrough; + case SIMATIC_IPC_DEVICE_427E: + wdd_data.parent = dev; + break; + default: + return -EINVAL; + } + + if (!devm_request_region(dev, io_resource.start, + resource_size(&io_resource), + io_resource.name)) { + dev_err(dev, + "Unable to register IO resource at %#x\n", + WD_ENABLE_IOADR); + return -EBUSY; + } + + if (plat->devmode == SIMATIC_IPC_DEVICE_427E) { + res = &mem_resource; + + /* get GPIO base from PCI */ + res->start = simatic_ipc_get_membase0(PCI_DEVFN(0x1f, 1)); + if (res->start == 0) + return -ENODEV; + + /* do the final address calculation */ + res->start = res->start + (GPIO_COMMUNITY0_PORT_ID << 16) + + PAD_CFG_DW0_GPP_A_23; + res->end += res->start; + + wd_reset_base_addr = devm_ioremap_resource(dev, res); + if (IS_ERR(wd_reset_base_addr)) + return PTR_ERR(wd_reset_base_addr); + } + + wdd_data.bootstatus = wd_setup(plat->devmode); + if (wdd_data.bootstatus) + dev_warn(dev, "last reboot caused by watchdog reset\n"); + + watchdog_set_nowayout(&wdd_data, nowayout); + watchdog_stop_on_reboot(&wdd_data); + return devm_watchdog_register_device(dev, &wdd_data); +} + +static struct platform_driver wdt_driver = { + .probe = simatic_ipc_wdt_probe, + .driver = { + .name = KBUILD_MODNAME, + }, +}; + +module_platform_driver(wdt_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" KBUILD_MODNAME); +MODULE_AUTHOR("Gerd Haeussler <gerd.haeussler.ext@siemens.com>");
This driver adds initial support for several devices from Siemens. It is based on a platform driver introduced in an earlier commit. Signed-off-by: Henning Schild <henning.schild@siemens.com> --- drivers/watchdog/Kconfig | 11 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/simatic-ipc-wdt.c | 215 +++++++++++++++++++++++++++++ 3 files changed, 227 insertions(+) create mode 100644 drivers/watchdog/simatic-ipc-wdt.c