Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933876Ab3HHH0C (ORCPT ); Thu, 8 Aug 2013 03:26:02 -0400 Received: from 5.mo4.mail-out.ovh.net ([188.165.44.50]:59945 "EHLO mo4.mail-out.ovh.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933637Ab3HHH0A (ORCPT ); Thu, 8 Aug 2013 03:26:00 -0400 X-Greylist: delayed 7800 seconds by postgrey-1.27 at vger.kernel.org; Thu, 08 Aug 2013 03:26:00 EDT From: Boris BREZILLON To: Grant Likely , Rob Herring , Rob Landley , Andrew Victor , Nicolas Ferre , Jean-Christophe Plagniol-Villard , Russell King , Mike Turquette , Felipe Balbi , Greg Kroah-Hartman , Ludovic Desroches , Josh Wu , Richard Genoud Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Boris BREZILLON X-Ovh-Mailout: 178.32.228.4 (mo4.mail-out.ovh.net) Subject: [PATCH v3 16/19] clk: at91: add PMC smd clock Date: Thu, 8 Aug 2013 09:17:23 +0200 Message-Id: <1375946243-9736-1-git-send-email-b.brezillon@overkiz.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1375937608-3773-1-git-send-email-b.brezillon@overkiz.com> References: <1375937608-3773-1-git-send-email-b.brezillon@overkiz.com> X-Ovh-Tracer-Id: 5105674603293079600 X-Ovh-Remote: 78.236.240.82 (cha74-5-78-236-240-82.fbx.proxad.net) X-Ovh-Local: 213.186.33.20 (ns0.ovh.net) X-OVH-SPAMSTATE: OK X-OVH-SPAMSCORE: -100 X-OVH-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeeikedrtdehucetufdoteggodetrfcurfhrohhfihhlvgemucfqggfjnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd X-Spam-Check: DONE|U 0.5/N X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeeikedrtdehucetufdoteggodetrfcurfhrohhfihhlvgemucfqggfjnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7406 Lines: 271 This patch adds at91 smd (Soft Modem) clock implementation using common clk framework. Not used by any driver right now. Signed-off-by: Boris BREZILLON --- arch/arm/mach-at91/Kconfig | 5 ++ drivers/clk/at91/Makefile | 1 + drivers/clk/at91/clk-smd.c | 171 ++++++++++++++++++++++++++++++++++++++++++++ drivers/clk/at91/pmc.c | 7 ++ drivers/clk/at91/pmc.h | 5 ++ 5 files changed, 189 insertions(+) create mode 100644 drivers/clk/at91/clk-smd.c diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig index b76dc4c..97033f7 100644 --- a/arch/arm/mach-at91/Kconfig +++ b/arch/arm/mach-at91/Kconfig @@ -39,6 +39,9 @@ config AT91_SAM9G45_RESET config AT91_SAM9_TIME bool +config HAVE_AT91_SMD + bool + config SOC_AT91SAM9 bool select AT91_SAM9_TIME @@ -85,6 +88,7 @@ config SOC_SAMA5D3 select HAVE_AT91_DBGU1 select AT91_USE_OLD_CLK select HAVE_AT91_UTMI + select HAVE_AT91_SMD select HAVE_AT91_USB_CLK help Select this if you are using one of Atmel's SAMA5D3 family SoC. @@ -157,6 +161,7 @@ config SOC_AT91SAM9X5 select SOC_AT91SAM9 select AT91_USE_OLD_CLK select HAVE_AT91_UTMI + select HAVE_AT91_SMD select HAVE_AT91_USB_CLK help Select this if you are using one of Atmel's AT91SAM9x5 family SoC. diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile index 61db058..0e92b71 100644 --- a/drivers/clk/at91/Makefile +++ b/drivers/clk/at91/Makefile @@ -9,3 +9,4 @@ obj-y += clk-system.o clk-peripheral.o obj-$(CONFIG_AT91_PROGRAMMABLE_CLOCKS) += clk-programmable.o obj-$(CONFIG_HAVE_AT91_UTMI) += clk-utmi.o obj-$(CONFIG_HAVE_AT91_USB_CLK) += clk-usb.o +obj-$(CONFIG_HAVE_AT91_SMD) += clk-smd.o diff --git a/drivers/clk/at91/clk-smd.c b/drivers/clk/at91/clk-smd.c new file mode 100644 index 0000000..a7cf14a --- /dev/null +++ b/drivers/clk/at91/clk-smd.c @@ -0,0 +1,171 @@ +/* + * drivers/clk/at91/clk-smd.c + * + * Copyright (C) 2013 Boris BREZILLON + * + * This program 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 + +#include "pmc.h" + +#define SMD_SOURCE_MAX 2 + +#define to_at91sam9x5_clk_smd(hw) \ + container_of(hw, struct at91sam9x5_clk_smd, hw) +struct at91sam9x5_clk_smd { + struct clk_hw hw; + struct at91_pmc *pmc; +}; + +static unsigned long at91sam9x5_clk_smd_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + u32 tmp; + u8 smddiv; + struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw); + struct at91_pmc *pmc = smd->pmc; + + tmp = pmc_read(pmc, AT91_PMC_SMD); + smddiv = (tmp & AT91_PMC_SMD_DIV) >> 8; + return parent_rate / (smddiv + 1); +} + +static long at91sam9x5_clk_smd_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + unsigned long div; + unsigned long bestrate; + unsigned long tmp; + + if (rate >= *parent_rate) + return *parent_rate; + + div = *parent_rate / rate; + if (div > 15) + return *parent_rate / 16; + + bestrate = *parent_rate / div; + tmp = *parent_rate / (div + 1); + if (bestrate - rate > rate - tmp) + bestrate = tmp; + + return bestrate; +} + +static int at91sam9x5_clk_smd_set_parent(struct clk_hw *hw, u8 index) +{ + u32 tmp; + struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw); + struct at91_pmc *pmc = smd->pmc; + + if (index > 1) + return -EINVAL; + tmp = pmc_read(pmc, AT91_PMC_SMD) & ~AT91_PMC_SMDS; + if (index) + tmp |= AT91_PMC_SMDS; + pmc_write(pmc, AT91_PMC_SMD, tmp); + return 0; +} + +static u8 at91sam9x5_clk_smd_get_parent(struct clk_hw *hw) +{ + struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw); + struct at91_pmc *pmc = smd->pmc; + + return pmc_read(pmc, AT91_PMC_SMD) & AT91_PMC_SMDS; +} + +static int at91sam9x5_clk_smd_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + u32 tmp; + struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw); + struct at91_pmc *pmc = smd->pmc; + unsigned long div = parent_rate / rate; + + if (parent_rate % rate || div < 1 || div > 16) + return -EINVAL; + tmp = pmc_read(pmc, AT91_PMC_SMD) & ~AT91_PMC_SMD_DIV; + tmp |= (div - 1) << 8; + pmc_write(pmc, AT91_PMC_SMD, tmp); + + return 0; +} + +static const struct clk_ops at91sam9x5_smd_ops = { + .recalc_rate = at91sam9x5_clk_smd_recalc_rate, + .round_rate = at91sam9x5_clk_smd_round_rate, + .get_parent = at91sam9x5_clk_smd_get_parent, + .set_parent = at91sam9x5_clk_smd_set_parent, + .set_rate = at91sam9x5_clk_smd_set_rate, +}; + +static struct clk * __init +at91sam9x5_clk_register_smd(struct at91_pmc *pmc, const char *name, + const char **parent_names, u8 num_parents) +{ + struct at91sam9x5_clk_smd *smd; + struct clk *clk = NULL; + struct clk_init_data init; + + smd = kzalloc(sizeof(*smd), GFP_KERNEL); + if (!smd) + return ERR_PTR(-ENOMEM); + + init.name = name; + init.ops = &at91sam9x5_smd_ops; + init.parent_names = parent_names; + init.num_parents = num_parents; + init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE; + + smd->hw.init = &init; + smd->pmc = pmc; + + clk = clk_register(NULL, &smd->hw); + + if (IS_ERR(clk)) + kfree(smd); + + return clk; +} + +void __init of_at91sam9x5_clk_smd_setup(struct device_node *np, + struct at91_pmc *pmc) +{ + struct clk *clk; + int i; + int num_parents; + const char *parent_names[SMD_SOURCE_MAX]; + const char *name = np->name; + + num_parents = of_count_phandle_with_args(np, "clocks", "#clock-cells"); + if (num_parents <= 0 || num_parents >= SMD_SOURCE_MAX) + return; + + for (i = 0; i < num_parents; i++) { + parent_names[i] = of_clk_get_parent_name(np, i); + if (!parent_names[i]) + return; + } + + of_property_read_string(np, "clock-output-names", &name); + + clk = at91sam9x5_clk_register_smd(pmc, name, parent_names, + num_parents); + + if (IS_ERR(clk)) + return; + + of_clk_add_provider(np, of_clk_src_simple_get, clk); +} diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c index e46de3d..0a731c8 100644 --- a/drivers/clk/at91/pmc.c +++ b/drivers/clk/at91/pmc.c @@ -298,6 +298,13 @@ static const struct of_device_id pmc_clk_ids[] __initdata = { .data = of_at91sam9x5_clk_usb_setup, }, #endif + /* SMD clock */ +#if defined(CONFIG_HAVE_AT91_SMD) + { + .compatible = "atmel,at91sam9x5-clk-smd", + .data = of_at91sam9x5_clk_smd_setup, + }, +#endif { /*sentinel*/ } }; diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h index b2efff5..43f2516 100644 --- a/drivers/clk/at91/pmc.h +++ b/drivers/clk/at91/pmc.h @@ -103,4 +103,9 @@ extern void __init of_at91sam9x5_clk_usb_setup(struct device_node *np, struct at91_pmc *pmc); #endif +#if defined(CONFIG_HAVE_AT91_SMD) +extern void __init of_at91sam9x5_clk_smd_setup(struct device_node *np, + struct at91_pmc *pmc); +#endif + #endif /* __PMC_H_ */ -- 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/