diff options
Diffstat (limited to 'target/linux/brcm2708/patches-3.10/0031-Add-cpufreq-driver.patch')
-rw-r--r-- | target/linux/brcm2708/patches-3.10/0031-Add-cpufreq-driver.patch | 301 |
1 files changed, 0 insertions, 301 deletions
diff --git a/target/linux/brcm2708/patches-3.10/0031-Add-cpufreq-driver.patch b/target/linux/brcm2708/patches-3.10/0031-Add-cpufreq-driver.patch deleted file mode 100644 index 0481490a70..0000000000 --- a/target/linux/brcm2708/patches-3.10/0031-Add-cpufreq-driver.patch +++ /dev/null @@ -1,301 +0,0 @@ -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 - |