/* * PIC32 deadman timer driver * * Purna Chandra Mandal * Copyright (c) 2016, Microchip Technology Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include #include #include #include #include #include #include #include #include #include #include #include /* Deadman Timer Regs */ #define DMTCON_REG 0x00 #define DMTPRECLR_REG 0x10 #define DMTCLR_REG 0x20 #define DMTSTAT_REG 0x30 #define DMTCNT_REG 0x40 #define DMTPSCNT_REG 0x60 #define DMTPSINTV_REG 0x70 /* Deadman Timer Regs fields */ #define DMT_ON BIT(15) #define DMT_STEP1_KEY BIT(6) #define DMT_STEP2_KEY BIT(3) #define DMTSTAT_WINOPN BIT(0) #define DMTSTAT_EVENT BIT(5) #define DMTSTAT_BAD2 BIT(6) #define DMTSTAT_BAD1 BIT(7) /* Reset Control Register fields for watchdog */ #define RESETCON_DMT_TIMEOUT BIT(5) struct pic32_dmt { void __iomem *regs; struct clk *clk; }; static inline void dmt_enable(struct pic32_dmt *dmt) { writel(DMT_ON, PIC32_SET(dmt->regs + DMTCON_REG)); } static inline void dmt_disable(struct pic32_dmt *dmt) { writel(DMT_ON, PIC32_CLR(dmt->regs + DMTCON_REG)); /* * Cannot touch registers in the CPU cycle following clearing the * ON bit. */ nop(); } static inline int dmt_bad_status(struct pic32_dmt *dmt) { u32 val; val = readl(dmt->regs + DMTSTAT_REG); val &= (DMTSTAT_BAD1 | DMTSTAT_BAD2 | DMTSTAT_EVENT); if (val) return -EAGAIN; return 0; } static inline int dmt_keepalive(struct pic32_dmt *dmt) { u32 v; u32 timeout = 500; /* set pre-clear key */ writel(DMT_STEP1_KEY << 8, dmt->regs + DMTPRECLR_REG); /* wait for DMT window to open */ while (--timeout) { v = readl(dmt->regs + DMTSTAT_REG) & DMTSTAT_WINOPN; if (v == DMTSTAT_WINOPN) break; } /* apply key2 */ writel(DMT_STEP2_KEY, dmt->regs + DMTCLR_REG); /* check whether keys are latched correctly */ return dmt_bad_status(dmt); } static inline u32 pic32_dmt_get_timeout_secs(struct pic32_dmt *dmt) { unsigned long rate; rate = clk_get_rate(dmt->clk); if (rate) return readl(dmt->regs + DMTPSCNT_REG) / rate; return 0; } static inline u32 pic32_dmt_bootstatus(struct pic32_dmt *dmt) { u32 v; void __iomem *rst_base; rst_base = ioremap(PIC32_BASE_RESET, 0x10); if (!rst_base) return 0; v = readl(rst_base); writel(RESETCON_DMT_TIMEOUT, PIC32_CLR(rst_base)); iounmap(rst_base); return v & RESETCON_DMT_TIMEOUT; } static int pic32_dmt_start(struct watchdog_device *wdd) { struct pic32_dmt *dmt = watchdog_get_drvdata(wdd); dmt_enable(dmt); return dmt_keepalive(dmt); } static int pic32_dmt_stop(struct watchdog_device *wdd) { struct pic32_dmt *dmt = watchdog_get_drvdata(wdd); dmt_disable(dmt); return 0; } static int pic32_dmt_ping(struct watchdog_device *wdd) { struct pic32_dmt *dmt = watchdog_get_drvdata(wdd); return dmt_keepalive(dmt); } static const struct watchdog_ops pic32_dmt_fops = { .owner = THIS_MODULE, .start = pic32_dmt_start, .stop = pic32_dmt_stop, .ping = pic32_dmt_ping, }; static const struct watchdog_info pic32_dmt_ident = { .options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, .identity = "PIC32 Deadman Timer", }; static struct watchdog_device pic32_dmt_wdd = { .info = &pic32_dmt_ident, .ops = &pic32_dmt_fops, }; static int pic32_dmt_probe(struct platform_device *pdev) { int ret; struct pic32_dmt *dmt; struct resource *mem; struct watchdog_device *wdd = &pic32_dmt_wdd; dmt = devm_kzalloc(&pdev->dev, sizeof(*dmt), GFP_KERNEL); if (!dmt) return -ENOMEM; mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); dmt->regs = devm_ioremap_resource(&pdev->dev, mem); if (IS_ERR(dmt->regs)) return PTR_ERR(dmt->regs); dmt->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(dmt->clk)) { dev_err(&pdev->dev, "clk not found\n"); return PTR_ERR(dmt->clk); } ret = clk_prepare_enable(dmt->clk); if (ret) return ret; wdd->timeout = pic32_dmt_get_timeout_secs(dmt); if (!wdd->timeout) { dev_err(&pdev->dev, "failed to read watchdog register timeout\n"); ret = -EINVAL; goto out_disable_clk; } dev_info(&pdev->dev, "timeout %d\n", wdd->timeout); wdd->bootstatus = pic32_dmt_bootstatus(dmt) ? WDIOF_CARDRESET : 0; watchdog_set_nowayout(wdd, WATCHDOG_NOWAYOUT); watchdog_set_drvdata(wdd, dmt); ret = watchdog_register_device(wdd); if (ret) { dev_err(&pdev->dev, "watchdog register failed, err %d\n", ret); goto out_disable_clk; } platform_set_drvdata(pdev, wdd); return 0; out_disable_clk: clk_disable_unprepare(dmt->clk); return ret; } static int pic32_dmt_remove(struct platform_device *pdev) { struct watchdog_device *wdd = platform_get_drvdata(pdev); struct pic32_dmt *dmt = watchdog_get_drvdata(wdd); watchdog_unregister_device(wdd); clk_disable_unprepare(dmt->clk); return 0; } static const struct of_device_id pic32_dmt_of_ids[] = { { .compatible = "microchip,pic32mzda-dmt",}, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, pic32_dmt_of_ids); static struct platform_driver pic32_dmt_driver = { .probe = pic32_dmt_probe, .remove = pic32_dmt_remove, .driver = { .name = "pic32-dmt", .of_match_table = of_match_ptr(pic32_dmt_of_ids), } }; module_platform_driver(pic32_dmt_driver); MODULE_AUTHOR("Purna Chandra Mandal "); MODULE_DESCRIPTION("Microchip PIC32 DMT Driver"); MODULE_LICENSE("GPL"); -remove&id=424414947da3dd5cb0d60e4f299f7c51e472ae77'>a4067480c4256c80ae8f8438a3e4bb88e32050bc /include/net/ip6_tunnel.h parenta3683e0c1410c5c8136a7a93b0336ce88d3b893a (diff)parentd07830db1bdb254e4b50d366010b219286b8c937 (diff)
Merge tag 'usb-serial-4.10-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial into usb-linus
Johan writes: USB-serial fixes for v4.10-rc7 One more device ID for pl2303. Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'include/net/ip6_tunnel.h')