From patchwork Tue Jun 28 10:08:11 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rafael Wysocki X-Patchwork-Id: 924122 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter2.kernel.org (8.14.4/8.14.4) with ESMTP id p5SAQ4Eb025456 for ; Tue, 28 Jun 2011 10:26:04 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755437Ab1F1KIL (ORCPT ); Tue, 28 Jun 2011 06:08:11 -0400 Received: from ogre.sisk.pl ([217.79.144.158]:35855 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756448Ab1F1KHN (ORCPT ); Tue, 28 Jun 2011 06:07:13 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by ogre.sisk.pl (Postfix) with ESMTP id 3AA331B34C3; Tue, 28 Jun 2011 11:44:43 +0200 (CEST) Received: from ogre.sisk.pl ([127.0.0.1]) by localhost (ogre.sisk.pl [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 18304-05; Tue, 28 Jun 2011 11:44:21 +0200 (CEST) Received: from ferrari.rjw.lan (220-bem-13.acn.waw.pl [82.210.184.220]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ogre.sisk.pl (Postfix) with ESMTP id 509D11B0DA1; Tue, 28 Jun 2011 11:44:21 +0200 (CEST) From: "Rafael J. Wysocki" To: Magnus Damm Subject: Re: [PATCH 10/10 v6] ARM / shmobile: Support for I/O power domains for SH7372 (v8) Date: Tue, 28 Jun 2011 12:08:11 +0200 User-Agent: KMail/1.13.6 (Linux/3.0.0-rc4+; KDE/4.6.0; x86_64; ; ) Cc: Linux PM mailing list , "Greg Kroah-Hartman" , Paul Walmsley , Kevin Hilman , Alan Stern , LKML , linux-sh@vger.kernel.org, Paul Mundt References: <201106112223.04972.rjw@sisk.pl> <201106272125.12700.rjw@sisk.pl> In-Reply-To: MIME-Version: 1.0 Message-Id: <201106281208.11618.rjw@sisk.pl> X-Virus-Scanned: amavisd-new at ogre.sisk.pl using MkS_Vir for Linux Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter2.kernel.org [140.211.167.43]); Tue, 28 Jun 2011 10:26:04 +0000 (UTC) On Tuesday, June 28, 2011, Magnus Damm wrote: > On Tue, Jun 28, 2011 at 4:25 AM, Rafael J. Wysocki wrote: > > On Monday, June 27, 2011, Magnus Damm wrote: > >> On Sun, Jun 26, 2011 at 6:31 AM, Rafael J. Wysocki wrote: > >> > From: Rafael J. Wysocki > >> > > >> > Use the generic power domains support introduced by the previous > >> > patch to implement support for power domains on SH7372. > >> > > >> > Signed-off-by: Rafael J. Wysocki > >> > Acked-by: Paul Mundt > >> > --- > >> > >> Hi Rafael, > >> > >> Thanks for your work on this. I've been working on up-porting my A3RV > >> prototype, and I came across these minor details: > >> > >> > --- linux-2.6.orig/arch/arm/mach-shmobile/board-mackerel.c > >> > +++ linux-2.6/arch/arm/mach-shmobile/board-mackerel.c > >> > @@ -1582,6 +1582,10 @@ static void __init mackerel_init(void) > >> > > >> > platform_add_devices(mackerel_devices, ARRAY_SIZE(mackerel_devices)); > >> > > >> > + sh7372_init_pm_domain(SH7372_A4LC); > >> > + sh7372_add_device_to_domain(SH7372_A4LC, &lcdc_device); > >> > + sh7372_add_device_to_domain(SH7372_A4LC, &hdmi_lcdc_device); > >> > + > >> > hdmi_init_pm_clock(); > >> > sh7372_pm_init(); > >> > } > >> > Index: linux-2.6/arch/arm/mach-shmobile/include/mach/sh7372.h > >> > =================================================================== > >> > --- linux-2.6.orig/arch/arm/mach-shmobile/include/mach/sh7372.h > >> > +++ linux-2.6/arch/arm/mach-shmobile/include/mach/sh7372.h > >> > @@ -12,6 +12,7 @@ > >> > #define __ASM_SH7372_H__ > >> > > >> > #include > >> > +#include > >> > > >> > /* > >> > * Pin Function Controller: > >> > @@ -470,4 +471,31 @@ extern struct clk sh7372_fsibck_clk; > >> > extern struct clk sh7372_fsidiva_clk; > >> > extern struct clk sh7372_fsidivb_clk; > >> > > >> > +struct platform_device; > >> > + > >> > +struct sh7372_pm_domain { > >> > + struct generic_pm_domain genpd; > >> > + unsigned int bit_shift; > >> > +}; > >> > + > >> > +static inline struct sh7372_pm_domain *to_sh7372_pd(struct generic_pm_domain *d) > >> > +{ > >> > + return container_of(d, struct sh7372_pm_domain, genpd); > >> > +} > >> > + > >> > +#ifdef CONFIG_PM > >> > +extern struct sh7372_pm_domain sh7372_a4lc_domain; > >> > +#define SH7372_A4LC (&sh7372_a4lc_domain) > >> > + > >> > +extern void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd); > >> > +extern void sh7372_add_device_to_domain(struct sh7372_pm_domain *sh7372_pd, > >> > + struct platform_device *pdev); > >> > +#else > >> > +#define SH7372_A4LC NULL > >> > + > >> > +static inline void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd) {} > >> > +static inline void sh7372_add_device_to_domain(struct sh7372_pm_domain *pd, > >> > + struct platform_device *pdev) {} > >> > +#endif /* CONFIG_PM */ > >> > + > >> > #endif /* __ASM_SH7372_H__ */ > >> > >> Wouldn't it be easier to simply get rid of SH7372_A4LC? > > > > Not really, because the code won't build for both CONFIG_PM_RUNTIME and > > CONFIG_SUSPEND unset (resulting in CONFIG_PM unset). > > > >> Perhaps you have some special intention behind your #define, but for me the > >> following change is working just fine: > > > > Well, if CONFIG_PM is unset, sh7372_a4lc is not defined. > > True, but in the CONFIG_PM=n case sh7372_a4lc is never used by > sh7372_init_pm_domain() or sh7372_add_device_to_domain(). > > How about letting the preprocessor do the work for us instead? This > certainly builds without SH7372_A4LC in case of CONFIG_PM=n: > > #else > #define sh7372_init_pm_domain(pd) do { } while(0) > #define sh7372_add_device_to_domain(pd, pdev) do { } while(0) > #endif /* CONFIG_PM */ Yes, we can do that too, if you prefer it. Update patch is appended. Thanks, Rafael --- From: Rafael J. Wysocki Subject: ARM / shmobile: Support for I/O power domains for SH7372 (v9) Use the generic power domains support introduced by the previous patch to implement support for power domains on SH7372. Signed-off-by: Rafael J. Wysocki Acked-by: Paul Mundt --- arch/arm/Kconfig | 1 arch/arm/mach-shmobile/board-mackerel.c | 4 + arch/arm/mach-shmobile/include/mach/sh7372.h | 24 ++++++ arch/arm/mach-shmobile/pm-sh7372.c | 96 +++++++++++++++++++++++++++ 4 files changed, 125 insertions(+) -- To unsubscribe from this list: send the line "unsubscribe linux-sh" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Index: linux-2.6/arch/arm/mach-shmobile/board-mackerel.c =================================================================== --- linux-2.6.orig/arch/arm/mach-shmobile/board-mackerel.c +++ linux-2.6/arch/arm/mach-shmobile/board-mackerel.c @@ -1582,6 +1582,10 @@ static void __init mackerel_init(void) platform_add_devices(mackerel_devices, ARRAY_SIZE(mackerel_devices)); + sh7372_init_pm_domain(&sh7372_a4lc); + sh7372_add_device_to_domain(&sh7372_a4lc, &lcdc_device); + sh7372_add_device_to_domain(&sh7372_a4lc, &hdmi_lcdc_device); + hdmi_init_pm_clock(); sh7372_pm_init(); } Index: linux-2.6/arch/arm/mach-shmobile/include/mach/sh7372.h =================================================================== --- linux-2.6.orig/arch/arm/mach-shmobile/include/mach/sh7372.h +++ linux-2.6/arch/arm/mach-shmobile/include/mach/sh7372.h @@ -12,6 +12,7 @@ #define __ASM_SH7372_H__ #include +#include /* * Pin Function Controller: @@ -470,4 +471,27 @@ extern struct clk sh7372_fsibck_clk; extern struct clk sh7372_fsidiva_clk; extern struct clk sh7372_fsidivb_clk; +struct platform_device; + +struct sh7372_pm_domain { + struct generic_pm_domain genpd; + unsigned int bit_shift; +}; + +static inline struct sh7372_pm_domain *to_sh7372_pd(struct generic_pm_domain *d) +{ + return container_of(d, struct sh7372_pm_domain, genpd); +} + +#ifdef CONFIG_PM +extern struct sh7372_pm_domain sh7372_a4lc; + +extern void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd); +extern void sh7372_add_device_to_domain(struct sh7372_pm_domain *sh7372_pd, + struct platform_device *pdev); +#else +#define sh7372_init_pm_domain(pd) do { } while(0) +#define sh7372_add_device_to_domain(pd, pdev) do { } while(0) +#endif /* CONFIG_PM */ + #endif /* __ASM_SH7372_H__ */ Index: linux-2.6/arch/arm/mach-shmobile/pm-sh7372.c =================================================================== --- linux-2.6.orig/arch/arm/mach-shmobile/pm-sh7372.c +++ linux-2.6/arch/arm/mach-shmobile/pm-sh7372.c @@ -15,16 +15,112 @@ #include #include #include +#include +#include +#include #include #include #include #include +#include #define SMFRAM 0xe6a70000 #define SYSTBCR 0xe6150024 #define SBAR 0xe6180020 #define APARMBAREA 0xe6f10020 +#define SPDCR 0xe6180008 +#define SWUCR 0xe6180014 +#define PSTR 0xe6180080 + +#define PSTR_RETRIES 100 +#define PSTR_DELAY_US 10 + +#ifdef CONFIG_PM + +static int pd_power_down(struct generic_pm_domain *genpd) +{ + struct sh7372_pm_domain *sh7372_pd = to_sh7372_pd(genpd); + unsigned int mask = 1 << sh7372_pd->bit_shift; + + if (__raw_readl(PSTR) & mask) { + unsigned int retry_count; + + __raw_writel(mask, SPDCR); + + for (retry_count = PSTR_RETRIES; retry_count; retry_count--) { + if (!(__raw_readl(SPDCR) & mask)) + break; + cpu_relax(); + } + } + + pr_debug("sh7372 power domain down 0x%08x -> PSTR = 0x%08x\n", + mask, __raw_readl(PSTR)); + + return 0; +} + +static int pd_power_up(struct generic_pm_domain *genpd) +{ + struct sh7372_pm_domain *sh7372_pd = to_sh7372_pd(genpd); + unsigned int mask = 1 << sh7372_pd->bit_shift; + unsigned int retry_count; + int ret = 0; + + if (__raw_readl(PSTR) & mask) + goto out; + + __raw_writel(mask, SWUCR); + + for (retry_count = 2 * PSTR_RETRIES; retry_count; retry_count--) { + if (!(__raw_readl(SWUCR) & mask)) + goto out; + if (retry_count > PSTR_RETRIES) + udelay(PSTR_DELAY_US); + else + cpu_relax(); + } + if (__raw_readl(SWUCR) & mask) + ret = -EIO; + + out: + pr_debug("sh7372 power domain up 0x%08x -> PSTR = 0x%08x\n", + mask, __raw_readl(PSTR)); + + return ret; +} + +void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd) +{ + struct generic_pm_domain *genpd = &sh7372_pd->genpd; + + pm_genpd_init(genpd, NULL, false); + genpd->stop_device = pm_clk_suspend; + genpd->start_device = pm_clk_resume; + genpd->power_off = pd_power_down; + genpd->power_on = pd_power_up; + pd_power_up(&sh7372_pd->genpd); +} + +void sh7372_add_device_to_domain(struct sh7372_pm_domain *sh7372_pd, + struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + + if (!dev->power.subsys_data) { + pm_clk_init(dev); + pm_clk_add(dev, NULL); + } + pm_genpd_add_device(&sh7372_pd->genpd, dev); +} + +struct sh7372_pm_domain sh7372_a4lc = { + .bit_shift = 1, +}; + +#endif /* CONFIG_PM */ + static void sh7372_enter_core_standby(void) { void __iomem *smfram = (void __iomem *)SMFRAM; Index: linux-2.6/arch/arm/Kconfig =================================================================== --- linux-2.6.orig/arch/arm/Kconfig +++ linux-2.6/arch/arm/Kconfig @@ -642,6 +642,7 @@ config ARCH_SHMOBILE select NO_IOPORT select SPARSE_IRQ select MULTI_IRQ_HANDLER + select PM_GENERIC_DOMAINS if PM help Support for Renesas's SH-Mobile and R-Mobile ARM platforms.