From bcd6f569e87471d7f104bd9497f0b516a3b12e32 Mon Sep 17 00:00:00 2001 From: Pawel Moll Date: Tue, 18 Sep 2012 15:17:48 +0100 Subject: [PATCH] clk: Common clocks implementation for Versatile Express This patch adds a DT and non-DT based implementation of the common clock infrastructure for Versatile Express platform. It registers (statically or using DT) all required fixed clocks, initialises motherboard's SP810 cell (that provides clocks for SP804 timers) and explicitly registers VE "osc" driver, to make the clock generators available early. Signed-off-by: Pawel Moll Signed-off-by: Mike Turquette --- arch/arm/include/asm/hardware/sp810.h | 2 + drivers/clk/Kconfig | 8 +- drivers/clk/versatile/Makefile | 1 + drivers/clk/versatile/clk-vexpress.c | 142 ++++++++++++++++++++++++++ 4 files changed, 150 insertions(+), 3 deletions(-) create mode 100644 drivers/clk/versatile/clk-vexpress.c diff --git a/arch/arm/include/asm/hardware/sp810.h b/arch/arm/include/asm/hardware/sp810.h index 6b9b077d86b3..afd7e916472f 100644 --- a/arch/arm/include/asm/hardware/sp810.h +++ b/arch/arm/include/asm/hardware/sp810.h @@ -56,6 +56,8 @@ #define SCCTRL_TIMEREN1SEL_REFCLK (0 << 17) #define SCCTRL_TIMEREN1SEL_TIMCLK (1 << 17) +#define SCCTRL_TIMERENnSEL_SHIFT(n) (15 + ((n) * 2)) + static inline void sysctl_soft_reset(void __iomem *base) { /* switch to slow mode */ diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 3d0b78438521..823f62d900ba 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -42,10 +42,12 @@ config COMMON_CLK_WM831X config COMMON_CLK_VERSATILE bool "Clock driver for ARM Reference designs" - depends on ARCH_INTEGRATOR || ARCH_REALVIEW + depends on ARCH_INTEGRATOR || ARCH_REALVIEW || ARCH_VEXPRESS ---help--- - Supports clocking on ARM Reference designs Integrator/AP, - Integrator/CP, RealView PB1176, EB, PB11MP and PBX. + Supports clocking on ARM Reference designs: + - Integrator/AP and Integrator/CP + - RealView PB1176, EB, PB11MP and PBX + - Versatile Express config COMMON_CLK_MAX77686 tristate "Clock driver for Maxim 77686 MFD" diff --git a/drivers/clk/versatile/Makefile b/drivers/clk/versatile/Makefile index 1e49a7afcf44..c776053e5bb4 100644 --- a/drivers/clk/versatile/Makefile +++ b/drivers/clk/versatile/Makefile @@ -2,4 +2,5 @@ obj-$(CONFIG_ICST) += clk-icst.o obj-$(CONFIG_ARCH_INTEGRATOR) += clk-integrator.o obj-$(CONFIG_ARCH_REALVIEW) += clk-realview.o +obj-$(CONFIG_ARCH_VEXPRESS) += clk-vexpress.o obj-$(CONFIG_VEXPRESS_CONFIG) += clk-vexpress-osc.o diff --git a/drivers/clk/versatile/clk-vexpress.c b/drivers/clk/versatile/clk-vexpress.c new file mode 100644 index 000000000000..c742ac7c60bb --- /dev/null +++ b/drivers/clk/versatile/clk-vexpress.c @@ -0,0 +1,142 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * Copyright (C) 2012 ARM Limited + */ + +#include +#include +#include +#include +#include +#include + +#include + +static struct clk *vexpress_sp810_timerclken[4]; +static DEFINE_SPINLOCK(vexpress_sp810_lock); + +static void __init vexpress_sp810_init(void __iomem *base) +{ + int i; + + if (WARN_ON(!base)) + return; + + for (i = 0; i < ARRAY_SIZE(vexpress_sp810_timerclken); i++) { + char name[12]; + const char *parents[] = { + "v2m:refclk32khz", /* REFCLK */ + "v2m:refclk1mhz" /* TIMCLK */ + }; + + snprintf(name, ARRAY_SIZE(name), "timerclken%d", i); + + vexpress_sp810_timerclken[i] = clk_register_mux(NULL, name, + parents, 2, 0, base + SCCTRL, + SCCTRL_TIMERENnSEL_SHIFT(i), 1, + 0, &vexpress_sp810_lock); + + if (WARN_ON(IS_ERR(vexpress_sp810_timerclken[i]))) + break; + } +} + + +static const char * const vexpress_clk_24mhz_periphs[] __initconst = { + "mb:uart0", "mb:uart1", "mb:uart2", "mb:uart3", + "mb:mmci", "mb:kmi0", "mb:kmi1" +}; + +void __init vexpress_clk_init(void __iomem *sp810_base) +{ + struct clk *clk; + int i; + + clk = clk_register_fixed_rate(NULL, "dummy_apb_pclk", NULL, + CLK_IS_ROOT, 0); + WARN_ON(clk_register_clkdev(clk, "apb_pclk", NULL)); + + clk = clk_register_fixed_rate(NULL, "v2m:clk_24mhz", NULL, + CLK_IS_ROOT, 24000000); + for (i = 0; i < ARRAY_SIZE(vexpress_clk_24mhz_periphs); i++) + WARN_ON(clk_register_clkdev(clk, NULL, + vexpress_clk_24mhz_periphs[i])); + + clk = clk_register_fixed_rate(NULL, "v2m:refclk32khz", NULL, + CLK_IS_ROOT, 32768); + WARN_ON(clk_register_clkdev(clk, NULL, "v2m:wdt")); + + clk = clk_register_fixed_rate(NULL, "v2m:refclk1mhz", NULL, + CLK_IS_ROOT, 1000000); + + vexpress_sp810_init(sp810_base); + + for (i = 0; i < ARRAY_SIZE(vexpress_sp810_timerclken); i++) + WARN_ON(clk_set_parent(vexpress_sp810_timerclken[i], clk)); + + WARN_ON(clk_register_clkdev(vexpress_sp810_timerclken[0], + "v2m-timer0", "sp804")); + WARN_ON(clk_register_clkdev(vexpress_sp810_timerclken[1], + "v2m-timer1", "sp804")); +} + +#if defined(CONFIG_OF) + +struct clk *vexpress_sp810_of_get(struct of_phandle_args *clkspec, void *data) +{ + if (WARN_ON(clkspec->args_count != 1 || clkspec->args[0] > + ARRAY_SIZE(vexpress_sp810_timerclken))) + return NULL; + + return vexpress_sp810_timerclken[clkspec->args[0]]; +} + +static const __initconst struct of_device_id vexpress_fixed_clk_match[] = { + { .compatible = "fixed-clock", .data = of_fixed_clk_setup, }, + { .compatible = "arm,vexpress-osc", .data = vexpress_osc_of_setup, }, + {} +}; + +void __init vexpress_clk_of_init(void) +{ + struct device_node *node; + struct clk *clk; + struct clk *refclk, *timclk; + + of_clk_init(vexpress_fixed_clk_match); + + node = of_find_compatible_node(NULL, NULL, "arm,sp810"); + vexpress_sp810_init(of_iomap(node, 0)); + of_clk_add_provider(node, vexpress_sp810_of_get, NULL); + + /* Select "better" (faster) parent for SP804 timers */ + refclk = of_clk_get_by_name(node, "refclk"); + timclk = of_clk_get_by_name(node, "timclk"); + if (!WARN_ON(IS_ERR(refclk) || IS_ERR(timclk))) { + int i = 0; + + if (clk_get_rate(refclk) > clk_get_rate(timclk)) + clk = refclk; + else + clk = timclk; + + for (i = 0; i < ARRAY_SIZE(vexpress_sp810_timerclken); i++) + WARN_ON(clk_set_parent(vexpress_sp810_timerclken[i], + clk)); + } + + WARN_ON(clk_register_clkdev(vexpress_sp810_timerclken[0], + "v2m-timer0", "sp804")); + WARN_ON(clk_register_clkdev(vexpress_sp810_timerclken[1], + "v2m-timer1", "sp804")); +} + +#endif