Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755878Ab3FGOah (ORCPT ); Fri, 7 Jun 2013 10:30:37 -0400 Received: from 12.mo1.mail-out.ovh.net ([87.98.162.229]:43920 "EHLO mo1.mail-out.ovh.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755650Ab3FGOaf (ORCPT ); Fri, 7 Jun 2013 10:30:35 -0400 From: Boris BREZILLON To: Mike Turquette , Jean-Christophe Plagniol-Villard , Nicolas Ferre , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Boris BREZILLON X-Ovh-Mailout: 178.32.228.1 (mo1.mail-out.ovh.net) Subject: [RFC PATCH 02/50] ARM: at91: add PMC main clock Date: Fri, 7 Jun 2013 16:24:10 +0200 Message-Id: <1370615115-16979-3-git-send-email-b.brezillon@overkiz.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1370615115-16979-1-git-send-email-b.brezillon@overkiz.com> References: <1370615115-16979-1-git-send-email-b.brezillon@overkiz.com> X-Ovh-Tracer-Id: 17156181305877640220 X-Ovh-Remote: 80.245.18.66 () X-Ovh-Local: 213.186.33.20 (ns0.ovh.net) X-OVH-SPAMSTATE: OK X-OVH-SPAMSCORE: -100 X-OVH-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeeiiedrgedtucetufdoteggodetrfcurfhrohhfihhlvgemucfqggfjnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd X-Spam-Check: DONE|U 0.5/N X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeeiiedrgedtucetufdoteggodetrfcurfhrohhfihhlvgemucfqggfjnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4390 Lines: 171 This is the at91 main oscillator clock implementation using common clk framework. If rate is not provided during clock registraction it is computed using the slow clock (main clk parent in this case) rate and the MCFR register. Signed-off-by: Boris BREZILLON --- drivers/clk/at91/Makefile | 5 ++ drivers/clk/at91/clk-main.c | 106 +++++++++++++++++++++++++++++++++++++++++++ include/linux/clk/at91.h | 10 ++++ 3 files changed, 121 insertions(+) diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile new file mode 100644 index 0000000..42c084e --- /dev/null +++ b/drivers/clk/at91/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for at91 specific clk +# + +obj-y += clk-main.o diff --git a/drivers/clk/at91/clk-main.c b/drivers/clk/at91/clk-main.c new file mode 100644 index 0000000..738fa39 --- /dev/null +++ b/drivers/clk/at91/clk-main.c @@ -0,0 +1,106 @@ +/* + * drivers/clk/at91/clk-main.c + * + * Copyright (C) 2013 Boris BREZILLON + * + * This mainram 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 + +#define to_clk_main(hw) container_of(hw, struct clk_main, hw) +struct clk_main { + struct clk_hw hw; + unsigned long rate; +}; + +static unsigned long clk_main_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + u32 tmp; + struct clk_main *clkmain = to_clk_main(hw); + if (clkmain->rate) + return clkmain->rate; + while ((tmp = at91_pmc_read(AT91_CKGR_MCFR)) & AT91_PMC_MAINRDY) + ; + tmp &= AT91_PMC_MAINF; + clkmain->rate = (tmp * parent_rate) / 16; + return clkmain->rate; +} + +static const struct clk_ops main_ops = { + .recalc_rate = clk_main_recalc_rate, +}; + +struct clk * __init +at91_clk_register_main(const char *name, + const char *parent_name, + unsigned long rate) +{ + struct clk_main *clkmain; + struct clk *clk = NULL; + struct clk_init_data init; + + if (!rate && !parent_name) + return ERR_PTR(-EINVAL); + + clkmain = kzalloc(sizeof(*clkmain), GFP_KERNEL); + if (!clkmain) + return ERR_PTR(-ENOMEM); + + init.name = name; + init.ops = &main_ops; + init.parent_names = parent_name ? &parent_name : NULL; + init.num_parents = parent_name ? 1 : 0; + init.flags = parent_name ? 0 : CLK_IS_ROOT; + + clkmain->hw.init = &init; + clkmain->rate = rate; + + clk = clk_register(NULL, &clkmain->hw); + + if (IS_ERR(clk)) + kfree(clkmain); + + return clk; +} + + + +#if defined(CONFIG_OF) +static void __init +of_at91_clk_main_setup(struct device_node *np) +{ + struct clk *clk; + const char *parent_name; + const char *name = np->name; + u32 rate = 0; + + parent_name = of_clk_get_parent_name(np, 0); + of_property_read_string(np, "clock-output-names", &name); + of_property_read_u32(np, "clock-frequency", &rate); + + clk = at91_clk_register_main(name, parent_name, rate); + + if (!IS_ERR(clk)) + return; + + of_clk_add_provider(np, of_clk_src_simple_get, clk); +} + +static void __init of_at91rm9200_clk_main_setup(struct device_node *np) +{ + of_at91_clk_main_setup(np); +} +CLK_OF_DECLARE(at91rm9200_clk_main, "atmel,at91rm9200-clk-main", + of_at91rm9200_clk_main_setup); +#endif diff --git a/include/linux/clk/at91.h b/include/linux/clk/at91.h index 58b1eba..c0801e7 100644 --- a/include/linux/clk/at91.h +++ b/include/linux/clk/at91.h @@ -16,6 +16,8 @@ #ifndef AT91_PMC_H #define AT91_PMC_H +#include + #ifndef __ASSEMBLY__ extern void __iomem *at91_pmc_base; @@ -184,4 +186,12 @@ extern void __iomem *at91_pmc_base; #define AT91_PMC_PCR_DIV8 0x8 /* Peripheral clock is MCK/8 */ #define AT91_PMC_PCR_EN (0x1 << 28) /* Enable */ + + + +struct clk * __init +at91_clk_register_main(const char *name, + const char *parent_name, + unsigned long rate); + #endif -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/