From patchwork Mon Aug 31 10:18:05 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sekhar Nori X-Patchwork-Id: 44848 Received: from bear.ext.ti.com (bear.ext.ti.com [192.94.94.41]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n7VAKHPw019240 for ; Mon, 31 Aug 2009 10:20:17 GMT Received: from dlep35.itg.ti.com ([157.170.170.118]) by bear.ext.ti.com (8.13.7/8.13.7) with ESMTP id n7VAKCAr021261 for ; Mon, 31 Aug 2009 05:20:17 -0500 Received: from linux.omap.com (localhost [127.0.0.1]) by dlep35.itg.ti.com (8.13.7/8.13.7) with ESMTP id n7VAK728024532 for ; Mon, 31 Aug 2009 05:20:07 -0500 (CDT) Received: from linux.omap.com (localhost [127.0.0.1]) by linux.omap.com (Postfix) with ESMTP id 52811808AA for ; Mon, 31 Aug 2009 05:19:34 -0500 (CDT) X-Original-To: davinci-linux-open-source@linux.davincidsp.com Delivered-To: davinci-linux-open-source@linux.davincidsp.com Received: from dbdp31.itg.ti.com (dbdp31.itg.ti.com [172.24.170.98]) by linux.omap.com (Postfix) with ESMTP id 245BA8062F for ; Mon, 31 Aug 2009 05:18:11 -0500 (CDT) Received: from psplinux051.india.ti.com (localhost [127.0.0.1]) by dbdp31.itg.ti.com (8.13.8/8.13.8) with ESMTP id n7VAI8sV001144; Mon, 31 Aug 2009 15:48:08 +0530 (IST) Received: from psplinux051.india.ti.com (localhost [127.0.0.1]) by psplinux051.india.ti.com (8.13.1/8.13.1) with ESMTP id n7VAI811003011; Mon, 31 Aug 2009 15:48:08 +0530 Received: (from a0875516@localhost) by psplinux051.india.ti.com (8.13.1/8.13.1/Submit) id n7VAI85F003008; Mon, 31 Aug 2009 15:48:08 +0530 From: Sekhar Nori To: davinci-linux-open-source@linux.davincidsp.com Date: Mon, 31 Aug 2009 15:48:05 +0530 Message-Id: <1251713887-2824-8-git-send-email-nsekhar@ti.com> X-Mailer: git-send-email 1.6.2.4 In-Reply-To: <1251713887-2824-7-git-send-email-nsekhar@ti.com> References: <1251713887-2824-1-git-send-email-nsekhar@ti.com> <1251713887-2824-2-git-send-email-nsekhar@ti.com> <1251713887-2824-3-git-send-email-nsekhar@ti.com> <1251713887-2824-4-git-send-email-nsekhar@ti.com> <1251713887-2824-5-git-send-email-nsekhar@ti.com> <1251713887-2824-6-git-send-email-nsekhar@ti.com> <1251713887-2824-7-git-send-email-nsekhar@ti.com> Cc: Subject: [PATCH v4 08/10] davinci: DA850/OMAP-L138: allow async3 source to be changed X-BeenThere: davinci-linux-open-source@linux.davincidsp.com X-Mailman-Version: 2.1.4 Precedence: list List-Id: davinci-linux-open-source.linux.davincidsp.com List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: davinci-linux-open-source-bounces+patchwork-davinci=patchwork.kernel.org@linux.davincidsp.com Errors-To: davinci-linux-open-source-bounces+patchwork-davinci=patchwork.kernel.org@linux.davincidsp.com The patch allows Async3 clock source to be selected between PLL1 SYSCLK2 and PLL0 SYSCLK2. Having Async3 source from PLL1 SYSCLK2 allows peripherals on that domain to remain unaffected by frequency scaling on PLL0. Signed-off-by: Sekhar Nori --- arch/arm/mach-davinci/clock.h | 4 +- arch/arm/mach-davinci/da850.c | 40 ++++++++++++++++++++++++++++ arch/arm/mach-davinci/include/mach/da8xx.h | 1 + 3 files changed, 43 insertions(+), 2 deletions(-) diff --git a/arch/arm/mach-davinci/clock.h b/arch/arm/mach-davinci/clock.h index a75d3f7..d45dc69 100644 --- a/arch/arm/mach-davinci/clock.h +++ b/arch/arm/mach-davinci/clock.h @@ -69,9 +69,9 @@ struct clk { const char *name; unsigned long rate; u8 usecount; - u8 flags; u8 lpsc; u8 psc_ctlr; + u32 flags; struct clk *parent; struct list_head children; /* list of children */ struct list_head childnode; /* parent's child list node */ @@ -82,7 +82,7 @@ struct clk { int (*round_rate) (struct clk *clk, unsigned long rate); }; -/* Clock flags */ +/* Clock flags: SoC-specific flags start at BIT(16) */ #define ALWAYS_ENABLED BIT(1) #define CLK_PSC BIT(2) #define PSC_DSP BIT(3) /* PSC uses DSP domain, not ARM */ diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c index f5c3a6a..2162b86 100644 --- a/arch/arm/mach-davinci/da850.c +++ b/arch/arm/mach-davinci/da850.c @@ -30,12 +30,17 @@ #include "clock.h" #include "mux.h" +/* SoC specific clock flags */ +#define DA850_CLK_ASYNC3 BIT(16) + #define DA850_PLL1_BASE 0x01e1a000 #define DA850_TIMER64P2_BASE 0x01f0c000 #define DA850_TIMER64P3_BASE 0x01f0d000 #define DA850_REF_FREQ 24000000 +#define CFGCHIP3_ASYNC3_CLKSRC BIT(4) + static struct pll_data pll0_data = { .num = 1, .phys_base = DA8XX_PLL0_BASE, @@ -232,6 +237,7 @@ static struct clk uart1_clk = { .name = "uart1", .parent = &pll0_sysclk2, .lpsc = DA8XX_LPSC1_UART1, + .flags = DA850_CLK_ASYNC3, .psc_ctlr = 1, }; @@ -239,6 +245,7 @@ static struct clk uart2_clk = { .name = "uart2", .parent = &pll0_sysclk2, .lpsc = DA8XX_LPSC1_UART2, + .flags = DA850_CLK_ASYNC3, .psc_ctlr = 1, }; @@ -790,6 +797,30 @@ static struct davinci_timer_info da850_timer_info = { .clocksource_id = T0_TOP, }; +static void da850_set_async3_src(int pllnum) +{ + struct clk *clk, *newparent = pllnum ? &pll1_sysclk2 : &pll0_sysclk2; + struct davinci_clk *c; + unsigned int v; + int ret; + + for (c = da850_clks; c->lk.clk; c++) { + clk = c->lk.clk; + if (clk->flags & DA850_CLK_ASYNC3) { + ret = clk_set_parent(clk, newparent); + WARN(ret, "DA850: unable to re-parent clock %s", + clk->name); + } + } + + v = __raw_readl(DA8XX_SYSCFG_VIRT(DA8XX_CFGCHIP3_REG)); + if (pllnum) + v |= CFGCHIP3_ASYNC3_CLKSRC; + else + v &= ~CFGCHIP3_ASYNC3_CLKSRC; + __raw_writel(v, DA8XX_SYSCFG_VIRT(DA8XX_CFGCHIP3_REG)); +} + static struct davinci_soc_info davinci_soc_info_da850 = { .io_desc = da850_io_desc, .io_desc_num = ARRAY_SIZE(da850_io_desc), @@ -823,4 +854,13 @@ void __init da850_init(void) davinci_soc_info_da850.pinmux_base = DA8XX_SYSCFG_VIRT(0x120); davinci_common_init(&davinci_soc_info_da850); + + /* + * Move the clock source of Async3 domain to PLL1 SYSCLK2. + * This helps keeping the peripherals on this domain insulated + * from CPU frequency changes caused by DVFS. The firmware sets + * both PLL0 and PLL1 to the same frequency so, there should not + * be any noticible change even in non-DVFS use cases. + */ + da850_set_async3_src(1); } diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h b/arch/arm/mach-davinci/include/mach/da8xx.h index 6cee01d..325c15e 100644 --- a/arch/arm/mach-davinci/include/mach/da8xx.h +++ b/arch/arm/mach-davinci/include/mach/da8xx.h @@ -34,6 +34,7 @@ extern void __iomem *da8xx_syscfg_base; #define DA8XX_SYSCFG_BASE (IO_PHYS + 0x14000) #define DA8XX_SYSCFG_VIRT(x) (da8xx_syscfg_base + (x)) #define DA8XX_JTAG_ID_REG 0x18 +#define DA8XX_CFGCHIP3_REG 0x188 #define DA8XX_PSC0_BASE 0x01c10000 #define DA8XX_PLL0_BASE 0x01c11000