brcm2708: add linux 4.1 support

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

SVN-Revision: 46399

1 files changed, 268 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.1/0017-Add-cpufreq-driver.patch b/target/linux/brcm2708/patches-4.1/0017-Add-cpufreq-driver.patch
new file mode 100644
index 0000000000..6da1856d92
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.1/0017-Add-cpufreq-driver.patch
@@ -0,0 +1,268 @@
+From ccdc49f30be0caec97b9b7e4352b8c63eb45acdd Mon Sep 17 00:00:00 2001
+From: popcornmix <popcornmix@gmail.com>
+Date: Wed, 3 Jul 2013 00:49:20 +0100
+Subject: [PATCH 017/121] Add cpufreq driver
+
+Signed-off-by: popcornmix <popcornmix@gmail.com>
+---
+ drivers/cpufreq/Kconfig.arm       |   9 ++
+ drivers/cpufreq/Makefile          |   1 +
+ drivers/cpufreq/bcm2835-cpufreq.c | 224 ++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 234 insertions(+)
+ create mode 100644 drivers/cpufreq/bcm2835-cpufreq.c
+
+--- a/drivers/cpufreq/Kconfig.arm
++++ b/drivers/cpufreq/Kconfig.arm
+@@ -258,6 +258,15 @@ config ARM_SPEAR_CPUFREQ
+ 	help
+ 	  This adds the CPUFreq driver support for SPEAr SOCs.
+ 
++config ARM_BCM2835_CPUFREQ
++	depends on BCM2708_MBOX
++	bool "BCM2835 Driver"
++	default y
++	help
++	  This adds the CPUFreq driver for BCM2835
++
++	  If in doubt, say N.
++
+ config ARM_TEGRA_CPUFREQ
+ 	bool "TEGRA CPUFreq support"
+ 	depends on ARCH_TEGRA
+--- a/drivers/cpufreq/Makefile
++++ b/drivers/cpufreq/Makefile
+@@ -77,6 +77,7 @@ obj-$(CONFIG_ARM_S5PV210_CPUFREQ)	+= s5p
+ obj-$(CONFIG_ARM_SA1100_CPUFREQ)	+= sa1100-cpufreq.o
+ obj-$(CONFIG_ARM_SA1110_CPUFREQ)	+= sa1110-cpufreq.o
+ obj-$(CONFIG_ARM_SPEAR_CPUFREQ)		+= spear-cpufreq.o
++obj-$(CONFIG_ARM_BCM2835_CPUFREQ)	+= bcm2835-cpufreq.o
+ obj-$(CONFIG_ARM_TEGRA_CPUFREQ)		+= tegra-cpufreq.o
+ obj-$(CONFIG_ARM_VEXPRESS_SPC_CPUFREQ)	+= vexpress-spc-cpufreq.o
+ 
+--- /dev/null
++++ b/drivers/cpufreq/bcm2835-cpufreq.c
+@@ -0,0 +1,224 @@
++/*****************************************************************************
++* 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 <linux/platform_data/mailbox-bcm2708.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 */
++
++static struct cpufreq_frequency_table bcm2835_freq_table[] = {
++	{0, 0, 0},
++	{0, 0, 0},
++	{0, 0, CPUFREQ_TABLE_END},
++};
++
++/*
++ ===============================================
++  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 */
++	const unsigned int transition_latency = 355000; /* ns */
++
++	/* now find out what the maximum and minimum frequencies are */
++	bcm2835_freq_table[0].frequency = bcm2835_cpufreq_get_clock(VCMSG_GET_MIN_CLOCK);
++	bcm2835_freq_table[1].frequency = bcm2835_cpufreq_get_clock(VCMSG_GET_MAX_CLOCK);
++
++	print_info("min=%d max=%d\n", bcm2835_freq_table[0].frequency, bcm2835_freq_table[1].frequency);
++	return cpufreq_generic_init(policy, bcm2835_freq_table, transition_latency);
++}
++
++/*
++ =====================================================================
++  Target index function chooses the requested frequency from the table
++ =====================================================================
++*/
++
++static int bcm2835_cpufreq_driver_target_index(struct cpufreq_policy *policy, unsigned int state)
++{
++	unsigned int target_freq = bcm2835_freq_table[state].frequency;
++	unsigned int cur = bcm2835_cpufreq_set_clock(policy->cur, target_freq);
++
++	if (!cur)
++	{
++		print_err("Error occurred setting a new frequency (%d)\n", target_freq);
++		return -EINVAL;
++	}
++	print_debug("%s: %i: freq %d->%d\n", policy->governor->name, state, policy->cur, cur);
++	return 0;
++}
++
++/*
++ ======================================================
++  Get function returns the current frequency from table
++ ======================================================
++*/
++
++static unsigned int bcm2835_cpufreq_driver_get(unsigned int cpu)
++{
++	unsigned int actual_rate = bcm2835_cpufreq_get_clock(VCMSG_GET_CLOCK_RATE);
++	print_debug("%d: freq=%d\n", cpu, actual_rate);
++	return actual_rate <= bcm2835_freq_table[0].frequency ? bcm2835_freq_table[0].frequency : bcm2835_freq_table[1].frequency;
++}
++
++/* the CPUFreq driver */
++static struct cpufreq_driver bcm2835_cpufreq_driver = {
++	.name         = "BCM2835 CPUFreq",
++	.init         = bcm2835_cpufreq_driver_init,
++	.verify       = cpufreq_generic_frequency_table_verify,
++	.target_index = bcm2835_cpufreq_driver_target_index,
++	.get          = bcm2835_cpufreq_driver_get,
++	.attr         = cpufreq_generic_attr,
++};
++
++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);