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Date: Fri, 4 Nov 2011 16:14:25 -0500 From: Scott Wood <scottwood@...escale.com> To: Zhao Chenhui <chenhui.zhao@...escale.com> CC: <linuxppc-dev@...ts.ozlabs.org>, <netdev@...r.kernel.org> Subject: Re: [PATCH 6/7] fsl_pmc: Add API to enable device as wakeup event source On 11/04/2011 07:39 AM, Zhao Chenhui wrote: > @@ -45,6 +46,72 @@ static int has_lossless; > * code can be compatible with both 32-bit & 36-bit */ > extern void mpc85xx_enter_deep_sleep(u64 ccsrbar, u32 powmgtreq); > > +#ifdef CONFIG_FSL_PMC > +/** > + * pmc_enable_wake - enable OF device as wakeup event source > + * @pdev: platform device affected > + * @state: PM state from which device will issue wakeup events > + * @enable: True to enable event generation; false to disable > + * > + * This enables the device as a wakeup event source, or disables it. > + * > + * RETURN VALUE: > + * 0 is returned on success > + * -EINVAL is returned if device is not supposed to wake up the system > + * Error code depending on the platform is returned if both the platform and > + * the native mechanism fail to enable the generation of wake-up events > + */ > +int pmc_enable_wake(struct platform_device *pdev, > + suspend_state_t state, bool enable) "pmc" is too generic for a global function. If this can be either enable or disable, perhaps it should be something like mpc85xx_pmc_set_wake(). > +{ > + int ret = 0; > + struct device_node *clk_np; > + u32 *pmcdr_mask; > + > + if (!pmc_regs) { > + printk(KERN_WARNING "PMC is unavailable\n"); > + return -ENOMEM; > + } -ENOMEM is not appropriate here, maybe -ENODEV? Should print __func__ so the user knows what's complaining. > + if (enable && !device_may_wakeup(&pdev->dev)) > + return -EINVAL; > + > + clk_np = of_parse_phandle(pdev->dev.of_node, "clk-handle", 0); > + if (!clk_np) > + return -EINVAL; > + > + pmcdr_mask = (u32 *)of_get_property(clk_np, "fsl,pmcdr-mask", NULL); > + if (!pmcdr_mask) { > + ret = -EINVAL; > + goto out; > + } > + > + /* clear to enable clock in low power mode */ > + if (enable) > + clrbits32(&pmc_regs->pmcdr, *pmcdr_mask); > + else > + setbits32(&pmc_regs->pmcdr, *pmcdr_mask); We should probably initialize PMCDR to all bits set (or at least all ones we know are valid) -- the default should be "not a wakeup source". > +/** > + * pmc_enable_lossless - enable lossless ethernet in low power mode > + * @enable: True to enable event generation; false to disable > + */ > +void pmc_enable_lossless(int enable) > +{ > + if (enable && has_lossless) > + setbits32(&pmc_regs->pmcsr, PMCSR_LOSSLESS); > + else > + clrbits32(&pmc_regs->pmcsr, PMCSR_LOSSLESS); > +} > +EXPORT_SYMBOL_GPL(pmc_enable_lossless); > +#endif Won't we overwrite this later? -Scott -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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