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261 lines
7.2 KiB
Diff
261 lines
7.2 KiB
Diff
From 466743ec93a99240c1a5a04d65f490fd8370fbc3 Mon Sep 17 00:00:00 2001
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From: notro <notro@tronnes.org>
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Date: Sun, 6 Jul 2014 12:09:30 +0200
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Subject: [PATCH 048/114] BCM2708: Migrate to the Common Clock Framework
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As part of moving towards using Device Tree, the Common Clock Framework
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has to be used instead of the BCM2708 clock implementation.
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Selecting COMMON_CLK removes the need to set CLKDEV_LOOKUP and HAVE_CLK explicitly.
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CONFIG_ARCH_BCM2708_CHIPIT #ifdef's are removed. They are no longer in use.
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Signed-off-by: Noralf Tronnes <notro@tronnes.org>
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---
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arch/arm/Kconfig | 3 +-
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arch/arm/mach-bcm2708/Makefile | 2 +-
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arch/arm/mach-bcm2708/bcm2708.c | 79 +++++++++++++++++------------------------
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arch/arm/mach-bcm2708/clock.c | 61 -------------------------------
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arch/arm/mach-bcm2708/clock.h | 24 -------------
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5 files changed, 34 insertions(+), 135 deletions(-)
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delete mode 100644 arch/arm/mach-bcm2708/clock.c
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delete mode 100644 arch/arm/mach-bcm2708/clock.h
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--- a/arch/arm/Kconfig
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+++ b/arch/arm/Kconfig
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@@ -385,11 +385,10 @@ config ARCH_BCM2708
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bool "Broadcom BCM2708 family"
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select CPU_V6
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select ARM_AMBA
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- select HAVE_CLK
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select HAVE_SCHED_CLOCK
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select NEED_MACH_GPIO_H
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select NEED_MACH_MEMORY_H
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- select CLKDEV_LOOKUP
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+ select COMMON_CLK
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select ARCH_HAS_CPUFREQ
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select GENERIC_CLOCKEVENTS
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select ARM_ERRATA_411920
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--- a/arch/arm/mach-bcm2708/Makefile
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+++ b/arch/arm/mach-bcm2708/Makefile
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@@ -2,6 +2,6 @@
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# Makefile for the linux kernel.
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#
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-obj-$(CONFIG_MACH_BCM2708) += clock.o bcm2708.o armctrl.o vcio.o power.o dma.o
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+obj-$(CONFIG_MACH_BCM2708) += bcm2708.o armctrl.o vcio.o power.o dma.o
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obj-$(CONFIG_BCM2708_GPIO) += bcm2708_gpio.o
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obj-$(CONFIG_BCM2708_VCMEM) += vc_mem.o
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--- a/arch/arm/mach-bcm2708/bcm2708.c
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+++ b/arch/arm/mach-bcm2708/bcm2708.c
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@@ -27,6 +27,8 @@
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#include <linux/interrupt.h>
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#include <linux/amba/bus.h>
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#include <linux/amba/clcd.h>
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+#include <linux/clk-provider.h>
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+#include <linux/clkdev.h>
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#include <linux/clockchips.h>
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#include <linux/cnt32_to_63.h>
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#include <linux/io.h>
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@@ -58,7 +60,6 @@
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#include "bcm2708.h"
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#include "armctrl.h"
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-#include "clock.h"
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#ifdef CONFIG_BCM_VC_CMA
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#include <linux/broadcom/vc_cma.h>
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@@ -84,7 +85,7 @@
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/* command line parameters */
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static unsigned boardrev, serial;
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-static unsigned uart_clock;
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+static unsigned uart_clock = UART0_CLOCK;
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static unsigned disk_led_gpio = 16;
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static unsigned disk_led_active_low = 1;
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static unsigned reboot_part = 0;
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@@ -196,51 +197,39 @@ static void __init bcm2708_clocksource_i
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}
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}
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+struct clk __init *bcm2708_clk_register(const char *name, unsigned long fixed_rate)
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+{
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+ struct clk *clk;
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-/*
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- * These are fixed clocks.
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- */
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-static struct clk ref24_clk = {
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- .rate = UART0_CLOCK, /* The UART is clocked at 3MHz via APB_CLK */
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-};
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+ clk = clk_register_fixed_rate(NULL, name, NULL, CLK_IS_ROOT,
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+ fixed_rate);
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+ if (IS_ERR(clk))
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+ pr_err("%s not registered\n", name);
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-static struct clk osc_clk = {
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-#ifdef CONFIG_ARCH_BCM2708_CHIPIT
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- .rate = 27000000,
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-#else
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- .rate = 500000000, /* ARM clock is set from the VideoCore booter */
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-#endif
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-};
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+ return clk;
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+}
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-/* warning - the USB needs a clock > 34MHz */
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+void __init bcm2708_register_clkdev(struct clk *clk, const char *name)
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+{
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+ int ret;
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-static struct clk sdhost_clk = {
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-#ifdef CONFIG_ARCH_BCM2708_CHIPIT
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- .rate = 4000000, /* 4MHz */
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-#else
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- .rate = 250000000, /* 250MHz */
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-#endif
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-};
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+ ret = clk_register_clkdev(clk, NULL, name);
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+ if (ret)
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+ pr_err("%s alias not registered\n", name);
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+}
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-static struct clk_lookup lookups[] = {
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- { /* UART0 */
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- .dev_id = "dev:f1",
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- .clk = &ref24_clk,
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- },
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- { /* USB */
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- .dev_id = "bcm2708_usb",
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- .clk = &osc_clk,
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- }, { /* SPI */
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- .dev_id = "bcm2708_spi.0",
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- .clk = &sdhost_clk,
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- }, { /* BSC0 */
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- .dev_id = "bcm2708_i2c.0",
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- .clk = &sdhost_clk,
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- }, { /* BSC1 */
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- .dev_id = "bcm2708_i2c.1",
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- .clk = &sdhost_clk,
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- }
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-};
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+void __init bcm2708_init_clocks(void)
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+{
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+ struct clk *clk;
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+
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+ clk = bcm2708_clk_register("uart0_clk", uart_clock);
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+ bcm2708_register_clkdev(clk, "dev:f1");
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+
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+ clk = bcm2708_clk_register("sdhost_clk", 250000000);
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+ bcm2708_register_clkdev(clk, "bcm2708_spi.0");
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+ bcm2708_register_clkdev(clk, "bcm2708_i2c.0");
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+ bcm2708_register_clkdev(clk, "bcm2708_i2c.1");
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+}
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#define UART0_IRQ { IRQ_UART, 0 /*NO_IRQ*/ }
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#define UART0_DMA { 15, 14 }
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@@ -755,11 +744,7 @@ void __init bcm2708_init(void)
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printk("bcm2708.uart_clock = %d\n", uart_clock);
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pm_power_off = bcm2708_power_off;
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- if (uart_clock)
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- lookups[0].clk->rate = uart_clock;
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-
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- for (i = 0; i < ARRAY_SIZE(lookups); i++)
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- clkdev_add(&lookups[i]);
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+ bcm2708_init_clocks();
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bcm_register_device(&bcm2708_dmaman_device);
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bcm_register_device(&bcm2708_vcio_device);
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--- a/arch/arm/mach-bcm2708/clock.c
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+++ /dev/null
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@@ -1,61 +0,0 @@
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-/*
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- * linux/arch/arm/mach-bcm2708/clock.c
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- *
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- * Copyright (C) 2010 Broadcom
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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- */
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-#include <linux/module.h>
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-#include <linux/kernel.h>
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-#include <linux/device.h>
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-#include <linux/list.h>
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-#include <linux/errno.h>
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-#include <linux/err.h>
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-#include <linux/string.h>
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-#include <linux/clk.h>
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-#include <linux/mutex.h>
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-
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-#include <asm/clkdev.h>
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-
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-#include "clock.h"
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-
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-int clk_enable(struct clk *clk)
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-{
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- return 0;
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-}
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-EXPORT_SYMBOL(clk_enable);
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-
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-void clk_disable(struct clk *clk)
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-{
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-}
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-EXPORT_SYMBOL(clk_disable);
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-
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-unsigned long clk_get_rate(struct clk *clk)
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-{
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- return clk->rate;
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-}
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-EXPORT_SYMBOL(clk_get_rate);
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-
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-long clk_round_rate(struct clk *clk, unsigned long rate)
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-{
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- return clk->rate;
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-}
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-EXPORT_SYMBOL(clk_round_rate);
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-
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-int clk_set_rate(struct clk *clk, unsigned long rate)
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-{
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- return -EIO;
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-}
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-EXPORT_SYMBOL(clk_set_rate);
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--- a/arch/arm/mach-bcm2708/clock.h
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+++ /dev/null
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@@ -1,24 +0,0 @@
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-/*
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- * linux/arch/arm/mach-bcm2708/clock.h
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- *
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- * Copyright (C) 2010 Broadcom
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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- */
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-struct module;
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-
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-struct clk {
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- unsigned long rate;
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-};
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