From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757311AbaIKP4k (ORCPT ); Thu, 11 Sep 2014 11:56:40 -0400 Received: from top.free-electrons.com ([176.31.233.9]:47784 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756862AbaIKPyS (ORCPT ); Thu, 11 Sep 2014 11:54:18 -0400 From: Alexandre Belloni To: Nicolas Ferre Cc: Jean-Christophe Plagniol-Villard , Boris Brezillon , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Alexandre Belloni , Mike Turquette Subject: [PATCH 2/7] clk: at91: add a driver for the h32mx clock Date: Thu, 11 Sep 2014 17:54:07 +0200 Message-Id: <1410450852-1834-3-git-send-email-alexandre.belloni@free-electrons.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1410450852-1834-1-git-send-email-alexandre.belloni@free-electrons.com> References: <1410450852-1834-1-git-send-email-alexandre.belloni@free-electrons.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Alexandre Belloni --- Cc: Mike Turquette .../devicetree/bindings/clock/at91-clock.txt | 15 +++ arch/arm/mach-at91/Kconfig | 3 + drivers/clk/at91/Makefile | 1 + drivers/clk/at91/clk-h32mx.c | 121 +++++++++++++++++++++ drivers/clk/at91/pmc.c | 6 + drivers/clk/at91/pmc.h | 5 + include/linux/clk/at91_pmc.h | 1 + 7 files changed, 152 insertions(+) create mode 100644 drivers/clk/at91/clk-h32mx.c diff --git a/Documentation/devicetree/bindings/clock/at91-clock.txt b/Documentation/devicetree/bindings/clock/at91-clock.txt index b3d544ca522a..c8dcbbd242e5 100644 --- a/Documentation/devicetree/bindings/clock/at91-clock.txt +++ b/Documentation/devicetree/bindings/clock/at91-clock.txt @@ -74,6 +74,9 @@ Required properties: "atmel,at91sam9x5-clk-utmi": at91 utmi clock + "atmel,sama5d4-clk-h32mx": + at91 h32mx clock + Required properties for SCKC node: - reg : defines the IO memory reserved for the SCKC. - #size-cells : shall be 0 (reg is used to encode clk id). @@ -447,3 +450,15 @@ For example: #clock-cells = <0>; clocks = <&main>; }; + +Required properties for h32mx clock: +- #clock-cells : from common clock binding; shall be set to 0. +- clocks : shall be the master clock source phandle. + +For example: + h32ck: h32mxck { + #clock-cells = <0>; + compatible = "atmel,sama5d4-clk-h32mx"; + clocks = <&mck>; + }; + diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig index 6eb3c658761d..a2c8ecb10730 100644 --- a/arch/arm/mach-at91/Kconfig +++ b/arch/arm/mach-at91/Kconfig @@ -39,6 +39,9 @@ config AT91_SAM9_TIME config HAVE_AT91_SMD bool +config HAVE_AT91_H64MX + bool + config SOC_AT91SAM9 bool select AT91_SAM9_TIME diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile index 4998aee59267..b2d43ff8112b 100644 --- a/drivers/clk/at91/Makefile +++ b/drivers/clk/at91/Makefile @@ -9,3 +9,4 @@ obj-y += clk-system.o clk-peripheral.o clk-programmable.o obj-$(CONFIG_HAVE_AT91_UTMI) += clk-utmi.o obj-$(CONFIG_HAVE_AT91_USB_CLK) += clk-usb.o obj-$(CONFIG_HAVE_AT91_SMD) += clk-smd.o +obj-$(CONFIG_HAVE_AT91_H64MX) += clk-h32mx.o diff --git a/drivers/clk/at91/clk-h32mx.c b/drivers/clk/at91/clk-h32mx.c new file mode 100644 index 000000000000..21a2f3630a43 --- /dev/null +++ b/drivers/clk/at91/clk-h32mx.c @@ -0,0 +1,121 @@ +/* + * drivers/clk/at91/clk-h32mx.c + * + * Copyright (C) 2014 Atmel + * + * Alexandre Belloni + * + * 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 +#include +#include +#include +#include +#include + +#include "pmc.h" + +struct clk_sama5d4_h32mx { + struct clk_hw hw; + struct at91_pmc *pmc; +}; + +#define to_clk_sama5d4_h32mx(hw) container_of(hw, struct clk_sama5d4_h32mx, hw) + +static unsigned long clk_sama5d4_h32mx_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_sama5d4_h32mx *h32mxclk = to_clk_sama5d4_h32mx(hw); + + if (pmc_read(h32mxclk->pmc, AT91_PMC_MCKR) & AT91_PMC_H32MXDIV) + return parent_rate / 2; + + if (parent_rate > 90000000) + pr_warn("H32 clock is too fast\n"); + return parent_rate; +} + +static long clk_sama5d4_h32mx_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + unsigned long div; + + if (rate > *parent_rate) + return *parent_rate; + div = *parent_rate / 2; + if (rate < div) + return div; + + if (rate - div < *parent_rate - rate) + return div; + + return *parent_rate; +} + +static int clk_sama5d4_h32mx_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_sama5d4_h32mx *h32mxclk = to_clk_sama5d4_h32mx(hw); + struct at91_pmc *pmc = h32mxclk->pmc; + u32 tmp; + + if (parent_rate != rate && (parent_rate / 2) != rate) + return -EINVAL; + + pmc_lock(pmc); + tmp = pmc_read(pmc, AT91_PMC_MCKR) & ~AT91_PMC_H32MXDIV; + if ((parent_rate / 2) == rate) + tmp |= AT91_PMC_H32MXDIV; + pmc_write(pmc, AT91_PMC_MCKR, tmp); + pmc_unlock(pmc); + + return 0; +} + +static const struct clk_ops h32mx_ops = { + .recalc_rate = clk_sama5d4_h32mx_recalc_rate, + .round_rate = clk_sama5d4_h32mx_round_rate, + .set_rate = clk_sama5d4_h32mx_set_rate, +}; + +void __init of_sama5d4_clk_h32mx_setup(struct device_node *np, + struct at91_pmc *pmc) +{ + struct clk_sama5d4_h32mx *h32mxclk; + struct clk_init_data init; + const char *parent_name; + struct clk *clk; + + h32mxclk = kzalloc(sizeof(*h32mxclk), GFP_KERNEL); + if (!h32mxclk) + return; + + parent_name = of_clk_get_parent_name(np, 0); + + init.name = np->name; + init.ops = &h32mx_ops; + init.parent_names = parent_name ? &parent_name : NULL; + init.num_parents = parent_name ? 1 : 0; + init.flags = CLK_SET_RATE_GATE; + + h32mxclk->hw.init = &init; + h32mxclk->pmc = pmc; + + clk = clk_register(NULL, &h32mxclk->hw); + if (!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 524196bb35a5..0d98b3f2b780 100644 --- a/drivers/clk/at91/pmc.c +++ b/drivers/clk/at91/pmc.c @@ -337,6 +337,12 @@ static const struct of_device_id pmc_clk_ids[] __initconst = { .data = of_at91sam9x5_clk_smd_setup, }, #endif +#if defined(CONFIG_HAVE_AT91_H64MX) + { + .compatible = "atmel,sama5d4-clk-h32mx", + .data = of_sama5d4_clk_h32mx_setup, + }, +#endif { /*sentinel*/ } }; diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h index 6c7625976113..52d2041fa3f6 100644 --- a/drivers/clk/at91/pmc.h +++ b/drivers/clk/at91/pmc.h @@ -120,4 +120,9 @@ extern void __init of_at91sam9x5_clk_smd_setup(struct device_node *np, struct at91_pmc *pmc); #endif +#if defined(CONFIG_HAVE_AT91_SMD) +extern void __init of_sama5d4_clk_h32mx_setup(struct device_node *np, + struct at91_pmc *pmc); +#endif + #endif /* __PMC_H_ */ diff --git a/include/linux/clk/at91_pmc.h b/include/linux/clk/at91_pmc.h index de4268d4987a..c8e3b3d1eded 100644 --- a/include/linux/clk/at91_pmc.h +++ b/include/linux/clk/at91_pmc.h @@ -125,6 +125,7 @@ extern void __iomem *at91_pmc_base; #define AT91_PMC_PLLADIV2 (1 << 12) /* PLLA divisor by 2 [some SAM9 only] */ #define AT91_PMC_PLLADIV2_OFF (0 << 12) #define AT91_PMC_PLLADIV2_ON (1 << 12) +#define AT91_PMC_H32MXDIV BIT(24) #define AT91_PMC_USB 0x38 /* USB Clock Register [some SAM9 only] */ #define AT91_PMC_USBS (0x1 << 0) /* USB OHCI Input clock selection */ -- 1.9.1