openwrtv3/target/linux/brcm2708/patches-3.10/0031-Add-cpufreq-driver.patch
Florian Fainelli 6918ea2484 brcm2708: update 3.10 patches with raspberrypi/rpi-3.10.y of 27 Apr. 2014
Update the 3.10 rasperry patches by rebasing raspberry/rpi-3.10-y
against linux-stable/v3.10.49.

Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 42678
2014-09-27 19:10:51 +00:00

301 lines
10 KiB
Diff

From 083183f7770ae4fb6f23c99a64a3c5058b9b3b40 Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Sat, 2 Nov 2013 22:44:41 +0000
Subject: [PATCH 031/196] Add cpufreq driver
---
arch/arm/Kconfig | 1 +
drivers/cpufreq/Kconfig.arm | 8 ++
drivers/cpufreq/Makefile | 1 +
drivers/cpufreq/bcm2835-cpufreq.c | 239 ++++++++++++++++++++++++++++++++++++++
4 files changed, 249 insertions(+)
create mode 100755 drivers/cpufreq/bcm2835-cpufreq.c
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 5468f1f..4e36ccd 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -369,6 +369,7 @@ config ARCH_BCM2708
select HAVE_SCHED_CLOCK
select NEED_MACH_MEMORY_H
select CLKDEV_LOOKUP
+ select ARCH_HAS_CPUFREQ
select GENERIC_CLOCKEVENTS
select ARM_ERRATA_411920
select MACH_BCM2708
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 6e57543..bf40783 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -150,3 +150,11 @@ config ARM_SPEAR_CPUFREQ
default y
help
This adds the CPUFreq driver support for SPEAr SOCs.
+
+config ARM_BCM2835_CPUFREQ
+ bool "BCM2835 Driver"
+ default y
+ help
+ This adds the CPUFreq driver for BCM2835
+
+ If in doubt, say N.
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 3b95322..3a30bab 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -72,6 +72,7 @@ obj-$(CONFIG_ARM_SA1100_CPUFREQ) += sa1100-cpufreq.o
obj-$(CONFIG_ARM_SA1110_CPUFREQ) += sa1110-cpufreq.o
obj-$(CONFIG_ARM_SPEAR_CPUFREQ) += spear-cpufreq.o
obj-$(CONFIG_ARCH_TEGRA) += tegra-cpufreq.o
+obj-$(CONFIG_ARM_BCM2835_CPUFREQ) += bcm2835-cpufreq.o
##################################################################################
# PowerPC platform drivers
diff --git a/drivers/cpufreq/bcm2835-cpufreq.c b/drivers/cpufreq/bcm2835-cpufreq.c
new file mode 100755
index 0000000..822139a
--- /dev/null
+++ b/drivers/cpufreq/bcm2835-cpufreq.c
@@ -0,0 +1,239 @@
+/*****************************************************************************
+* Copyright 2011 Broadcom Corporation. All rights reserved.
+*
+* Unless you and Broadcom execute a separate written software license
+* agreement governing use of this software, this software is licensed to you
+* under the terms of the GNU General Public License version 2, available at
+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+*
+* Notwithstanding the above, under no circumstances may you combine this
+* software in any way with any other Broadcom software provided under a
+* license other than the GPL, without Broadcom's express prior written
+* consent.
+*****************************************************************************/
+
+/*****************************************************************************
+* FILENAME: bcm2835-cpufreq.h
+* DESCRIPTION: This driver dynamically manages the CPU Frequency of the ARM
+* processor. Messages are sent to Videocore either setting or requesting the
+* frequency of the ARM in order to match an appropiate frequency to the current
+* usage of the processor. The policy which selects the frequency to use is
+* defined in the kernel .config file, but can be changed during runtime.
+*****************************************************************************/
+
+/* ---------- INCLUDES ---------- */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/cpufreq.h>
+#include <mach/vcio.h>
+
+/* ---------- DEFINES ---------- */
+/*#define CPUFREQ_DEBUG_ENABLE*/ /* enable debugging */
+#define MODULE_NAME "bcm2835-cpufreq"
+
+#define VCMSG_ID_ARM_CLOCK 0x000000003 /* Clock/Voltage ID's */
+
+/* debug printk macros */
+#ifdef CPUFREQ_DEBUG_ENABLE
+#define print_debug(fmt,...) pr_debug("%s:%s:%d: "fmt, MODULE_NAME, __func__, __LINE__, ##__VA_ARGS__)
+#else
+#define print_debug(fmt,...)
+#endif
+#define print_err(fmt,...) pr_err("%s:%s:%d: "fmt, MODULE_NAME, __func__,__LINE__, ##__VA_ARGS__)
+#define print_info(fmt,...) pr_info("%s: "fmt, MODULE_NAME, ##__VA_ARGS__)
+
+/* tag part of the message */
+struct vc_msg_tag {
+ uint32_t tag_id; /* the message id */
+ uint32_t buffer_size; /* size of the buffer (which in this case is always 8 bytes) */
+ uint32_t data_size; /* amount of data being sent or received */
+ uint32_t dev_id; /* the ID of the clock/voltage to get or set */
+ uint32_t val; /* the value (e.g. rate (in Hz)) to set */
+};
+
+/* message structure to be sent to videocore */
+struct vc_msg {
+ uint32_t msg_size; /* simply, sizeof(struct vc_msg) */
+ uint32_t request_code; /* holds various information like the success and number of bytes returned (refer to mailboxes wiki) */
+ struct vc_msg_tag tag; /* the tag structure above to make */
+ uint32_t end_tag; /* an end identifier, should be set to NULL */
+};
+
+/* ---------- GLOBALS ---------- */
+static struct cpufreq_driver bcm2835_cpufreq_driver; /* the cpufreq driver global */
+
+/*
+ ===============================================
+ clk_rate either gets or sets the clock rates.
+ ===============================================
+*/
+static uint32_t bcm2835_cpufreq_set_clock(int cur_rate, int arm_rate)
+{
+ int s, actual_rate=0;
+ struct vc_msg msg;
+
+ /* wipe all previous message data */
+ memset(&msg, 0, sizeof msg);
+
+ msg.msg_size = sizeof msg;
+
+ msg.tag.tag_id = VCMSG_SET_CLOCK_RATE;
+ msg.tag.buffer_size = 8;
+ msg.tag.data_size = 8; /* we're sending the clock ID and the new rates which is a total of 2 words */
+ msg.tag.dev_id = VCMSG_ID_ARM_CLOCK;
+ msg.tag.val = arm_rate * 1000;
+
+ /* send the message */
+ s = bcm_mailbox_property(&msg, sizeof msg);
+
+ /* check if it was all ok and return the rate in KHz */
+ if (s == 0 && (msg.request_code & 0x80000000))
+ actual_rate = msg.tag.val/1000;
+
+ print_debug("Setting new frequency = %d -> %d (actual %d)\n", cur_rate, arm_rate, actual_rate);
+ return actual_rate;
+}
+
+static uint32_t bcm2835_cpufreq_get_clock(int tag)
+{
+ int s;
+ int arm_rate = 0;
+ struct vc_msg msg;
+
+ /* wipe all previous message data */
+ memset(&msg, 0, sizeof msg);
+
+ msg.msg_size = sizeof msg;
+ msg.tag.tag_id = tag;
+ msg.tag.buffer_size = 8;
+ msg.tag.data_size = 4; /* we're just sending the clock ID which is one word long */
+ msg.tag.dev_id = VCMSG_ID_ARM_CLOCK;
+
+ /* send the message */
+ s = bcm_mailbox_property(&msg, sizeof msg);
+
+ /* check if it was all ok and return the rate in KHz */
+ if (s == 0 && (msg.request_code & 0x80000000))
+ arm_rate = msg.tag.val/1000;
+
+ print_debug("%s frequency = %d\n",
+ tag == VCMSG_GET_CLOCK_RATE ? "Current":
+ tag == VCMSG_GET_MIN_CLOCK ? "Min":
+ tag == VCMSG_GET_MAX_CLOCK ? "Max":
+ "Unexpected", arm_rate);
+
+ return arm_rate;
+}
+
+/*
+ ====================================================
+ Module Initialisation registers the cpufreq driver
+ ====================================================
+*/
+static int __init bcm2835_cpufreq_module_init(void)
+{
+ print_debug("IN\n");
+ return cpufreq_register_driver(&bcm2835_cpufreq_driver);
+}
+
+/*
+ =============
+ Module exit
+ =============
+*/
+static void __exit bcm2835_cpufreq_module_exit(void)
+{
+ print_debug("IN\n");
+ cpufreq_unregister_driver(&bcm2835_cpufreq_driver);
+ return;
+}
+
+/*
+ ==============================================================
+ Initialisation function sets up the CPU policy for first use
+ ==============================================================
+*/
+static int bcm2835_cpufreq_driver_init(struct cpufreq_policy *policy)
+{
+ /* measured value of how long it takes to change frequency */
+ policy->cpuinfo.transition_latency = 355000; /* ns */
+
+ /* now find out what the maximum and minimum frequencies are */
+ policy->min = policy->cpuinfo.min_freq = bcm2835_cpufreq_get_clock(VCMSG_GET_MIN_CLOCK);
+ policy->max = policy->cpuinfo.max_freq = bcm2835_cpufreq_get_clock(VCMSG_GET_MAX_CLOCK);
+ policy->cur = bcm2835_cpufreq_get_clock(VCMSG_GET_CLOCK_RATE);
+
+ print_info("min=%d max=%d cur=%d\n", policy->min, policy->max, policy->cur);
+ return 0;
+}
+
+/*
+ =================================================================================
+ Target function chooses the most appropriate frequency from the table to enable
+ =================================================================================
+*/
+
+static int bcm2835_cpufreq_driver_target(struct cpufreq_policy *policy, unsigned int target_freq, unsigned int relation)
+{
+ unsigned int target = target_freq;
+ unsigned int cur = policy->cur;
+ print_debug("%s: min=%d max=%d cur=%d target=%d\n",policy->governor->name,policy->min,policy->max,policy->cur,target_freq);
+
+ /* if we are above min and using ondemand, then just use max */
+ if (strcmp("ondemand", policy->governor->name)==0 && target > policy->min)
+ target = policy->max;
+ /* if the frequency is the same, just quit */
+ if (target == policy->cur)
+ return 0;
+
+ /* otherwise were good to set the clock frequency */
+ policy->cur = bcm2835_cpufreq_set_clock(policy->cur, target);
+
+ if (!policy->cur)
+ {
+ print_err("Error occurred setting a new frequency (%d)!\n", target);
+ policy->cur = bcm2835_cpufreq_get_clock(VCMSG_GET_CLOCK_RATE);
+ return -EINVAL;
+ }
+ print_debug("Freq %d->%d (min=%d max=%d target=%d request=%d)\n", cur, policy->cur, policy->min, policy->max, target_freq, target);
+ return 0;
+}
+
+static unsigned int bcm2835_cpufreq_driver_get(unsigned int cpu)
+{
+ unsigned int actual_rate = bcm2835_cpufreq_get_clock(VCMSG_GET_CLOCK_RATE);
+ print_debug("cpu=%d\n", actual_rate);
+ return actual_rate;
+}
+
+/*
+ =================================================================================
+ Verify ensures that when a policy is changed, it is suitable for the CPU to use
+ =================================================================================
+*/
+
+static int bcm2835_cpufreq_driver_verify(struct cpufreq_policy *policy)
+{
+ print_info("switching to governor %s\n", policy->governor->name);
+ return 0;
+}
+
+
+/* the CPUFreq driver */
+static struct cpufreq_driver bcm2835_cpufreq_driver = {
+ .name = "BCM2835 CPUFreq",
+ .owner = THIS_MODULE,
+ .init = bcm2835_cpufreq_driver_init,
+ .verify = bcm2835_cpufreq_driver_verify,
+ .target = bcm2835_cpufreq_driver_target,
+ .get = bcm2835_cpufreq_driver_get
+};
+
+MODULE_AUTHOR("Dorian Peake and Dom Cobley");
+MODULE_DESCRIPTION("CPU frequency driver for BCM2835 chip");
+MODULE_LICENSE("GPL");
+
+module_init(bcm2835_cpufreq_module_init);
+module_exit(bcm2835_cpufreq_module_exit);
+
--
1.9.1