/* * Watchdog driver for Renesas WDT watchdog * * Copyright (C) 2015-16 Wolfram Sang, Sang Engineering * Copyright (C) 2015-16 Renesas Electronics Corporation * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #define RWTCNT 0 #define RWTCSRA 4 #define RWTCSRA_WOVF BIT(4) #define RWTCSRA_WRFLG BIT(5) #define RWTCSRA_TME BIT(7) #define RWDT_DEFAULT_TIMEOUT 60U static const unsigned int clk_divs[] = { 1, 4, 16, 32, 64, 128, 1024 }; static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); struct rwdt_priv { void __iomem *base; struct watchdog_device wdev; struct clk *clk; unsigned int clks_per_sec; u8 cks; }; static void rwdt_write(struct rwdt_priv *priv, u32 val, unsigned int reg) { if (reg == RWTCNT) val |= 0x5a5a0000; else val |= 0xa5a5a500; writel_relaxed(val, priv->base + reg); } static int rwdt_init_timeout(struct watchdog_device *wdev) { struct rwdt_priv *priv = watchdog_get_drvdata(wdev); rwdt_write(priv, 65536 - wdev->timeout * priv->clks_per_sec, RWTCNT); return 0; } static int rwdt_start(struct watchdog_device *wdev) { struct rwdt_priv *priv = watchdog_get_drvdata(wdev); clk_prepare_enable(priv->clk); rwdt_write(priv, priv->cks, RWTCSRA); rwdt_init_timeout(wdev); while (readb_relaxed(priv->base + RWTCSRA) & RWTCSRA_WRFLG) cpu_relax(); rwdt_write(priv, priv->cks | RWTCSRA_TME, RWTCSRA); return 0; } static int rwdt_stop(struct watchdog_device *wdev) { struct rwdt_priv *priv = watchdog_get_drvdata(wdev); rwdt_write(priv, priv->cks, RWTCSRA); clk_disable_unprepare(priv->clk); return 0; } static unsigned int rwdt_get_timeleft(struct watchdog_device *wdev) { struct rwdt_priv *priv = watchdog_get_drvdata(wdev); u16 val = readw_relaxed(priv->base + RWTCNT); return DIV_ROUND_CLOSEST(65536 - val, priv->clks_per_sec); } static const struct watchdog_info rwdt_ident = { .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT, .identity = "Renesas WDT Watchdog", }; static const struct watchdog_ops rwdt_ops = { .owner = THIS_MODULE, .start = rwdt_start, .stop = rwdt_stop, .ping = rwdt_init_timeout, .get_timeleft = rwdt_get_timeleft, }; static int rwdt_probe(struct platform_device *pdev) { struct rwdt_priv *priv; struct resource *res; unsigned long rate; unsigned int clks_per_sec; int ret, i; priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); priv->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(priv->base)) return PTR_ERR(priv->base); priv->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(priv->clk)) return PTR_ERR(priv->clk); rate = clk_get_rate(priv->clk); if (!rate) return -ENOENT; for (i = ARRAY_SIZE(clk_divs) - 1; i >= 0; i--) { clks_per_sec = DIV_ROUND_UP(rate, clk_divs[i]); if (clks_per_sec) { priv->clks_per_sec = clks_per_sec; priv->cks = i; break; } } if (!clks_per_sec) { dev_err(&pdev->dev, "Can't find suitable clock divider\n"); return -ERANGE; } pm_runtime_enable(&pdev->dev); pm_runtime_get_sync(&pdev->dev); priv->wdev.info = &rwdt_ident, priv->wdev.ops = &rwdt_ops, priv->wdev.parent = &pdev->dev; priv->wdev.min_timeout = 1; priv->wdev.max_timeout = 65536 / clks_per_sec; priv->wdev.timeout = min(priv->wdev.max_timeout, RWDT_DEFAULT_TIMEOUT); platform_set_drvdata(pdev, priv); watchdog_set_drvdata(&priv->wdev, priv); watchdog_set_nowayout(&priv->wdev, nowayout); /* This overrides the default timeout only if DT configuration was found */ ret = watchdog_init_timeout(&priv->wdev, 0, &pdev->dev); if (ret) dev_warn(&pdev->dev, "Specified timeout value invalid, using default\n"); ret = watchdog_register_device(&priv->wdev); if (ret < 0) { pm_runtime_put(&pdev->dev); pm_runtime_disable(&pdev->dev); return ret; } return 0; } static int rwdt_remove(struct platform_device *pdev) { struct rwdt_priv *priv = platform_get_drvdata(pdev); watchdog_unregister_device(&priv->wdev); pm_runtime_put(&pdev->dev); pm_runtime_disable(&pdev->dev); return 0; } /* * This driver does also fit for R-Car Gen2 (r8a779[0-4]) WDT. However, for SMP * to work there, one also needs a RESET (RST) driver which does not exist yet * due to HW issues. This needs to be solved before adding compatibles here. */ static const struct of_device_id rwdt_ids[] = { { .compatible = "renesas,rcar-gen3-wdt", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, rwdt_ids); static struct platform_driver rwdt_driver = { .driver = { .name = "renesas_wdt", .of_match_table = rwdt_ids, }, .probe = rwdt_probe, .remove = rwdt_remove, }; module_platform_driver(rwdt_driver); MODULE_DESCRIPTION("Renesas WDT Watchdog Driver"); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Wolfram Sang "); 77f91b'>patch) tree098a7c0ca4fceb8a65cb1f693c9d71990388933d /sound/firewire/dice/dice-stream.c parenta0615a16f7d0ceb5804d295203c302d496d8ee91 (diff)
powerpc/mm: Fix spurrious segfaults on radix with autonuma
When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it clears all the protection bits but leave the PTE valid. With the Radix MMU, an attempt at executing from such a PTE will take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G". It is thus incorrect to treat all such faults as errors. We should pass them to handle_mm_fault() for autonuma to deal with. The case of pages that are really not executable is handled by the existing test for VM_EXEC further down. That leaves us with catching the kernel attempts at executing user pages. We can catch that earlier, even before we do find_vma. It is never valid on powerpc for the kernel to take an exec fault to begin with. So fold that test with the existing test for the kernel faulting on kernel addresses to bail out early. Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report") Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'sound/firewire/dice/dice-stream.c')