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-rw-r--r--target/linux/bcm27xx/patches-4.19/950-0051-Add-cpufreq-driver.patch259
1 files changed, 0 insertions, 259 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0051-Add-cpufreq-driver.patch b/target/linux/bcm27xx/patches-4.19/950-0051-Add-cpufreq-driver.patch
deleted file mode 100644
index b9cf14453c..0000000000
--- a/target/linux/bcm27xx/patches-4.19/950-0051-Add-cpufreq-driver.patch
+++ /dev/null
@@ -1,259 +0,0 @@
-From 0a248af6e18d7f1ad57fffa7f588bc8a5851832e Mon Sep 17 00:00:00 2001
-From: popcornmix <popcornmix@gmail.com>
-Date: Wed, 3 Jul 2013 00:49:20 +0100
-Subject: [PATCH] Add cpufreq driver
-
-Signed-off-by: popcornmix <popcornmix@gmail.com>
-
-bcm2835-cpufreq: Change licence to GPLv2
-
-Signed-off-by: Eben Upton <eben.upton@broadcom.com>
-Signed-off-by: Dom Cobley <dom@raspberrypi.com>
----
- drivers/cpufreq/Kconfig.arm | 9 ++
- drivers/cpufreq/Makefile | 1 +
- drivers/cpufreq/bcm2835-cpufreq.c | 210 ++++++++++++++++++++++++++++++
- 3 files changed, 220 insertions(+)
- create mode 100644 drivers/cpufreq/bcm2835-cpufreq.c
-
---- a/drivers/cpufreq/Kconfig.arm
-+++ b/drivers/cpufreq/Kconfig.arm
-@@ -260,6 +260,15 @@ config ARM_TANGO_CPUFREQ
- depends on CPUFREQ_DT && ARCH_TANGO
- default y
-
-+config ARM_BCM2835_CPUFREQ
-+ depends on RASPBERRYPI_FIRMWARE
-+ bool "BCM2835 Driver"
-+ default y
-+ help
-+ This adds the CPUFreq driver for BCM2835
-+
-+ If in doubt, say N.
-+
- config ARM_TEGRA20_CPUFREQ
- tristate "Tegra20 CPUFreq support"
- depends on ARCH_TEGRA
---- a/drivers/cpufreq/Makefile
-+++ b/drivers/cpufreq/Makefile
-@@ -80,6 +80,7 @@ obj-$(CONFIG_ARM_SCPI_CPUFREQ) += scpi-
- obj-$(CONFIG_ARM_SPEAR_CPUFREQ) += spear-cpufreq.o
- obj-$(CONFIG_ARM_STI_CPUFREQ) += sti-cpufreq.o
- obj-$(CONFIG_ARM_TANGO_CPUFREQ) += tango-cpufreq.o
-+obj-$(CONFIG_ARM_BCM2835_CPUFREQ) += bcm2835-cpufreq.o
- obj-$(CONFIG_ARM_TEGRA20_CPUFREQ) += tegra20-cpufreq.o
- obj-$(CONFIG_ARM_TEGRA124_CPUFREQ) += tegra124-cpufreq.o
- obj-$(CONFIG_ARM_TEGRA186_CPUFREQ) += tegra186-cpufreq.o
---- /dev/null
-+++ b/drivers/cpufreq/bcm2835-cpufreq.c
-@@ -0,0 +1,210 @@
-+/*
-+ * Copyright 2011 Broadcom Corporation.
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; version 2
-+ * of the License.
-+ *
-+ * 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 <soc/bcm2835/raspberrypi-firmware.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__)
-+
-+/* ---------- GLOBALS ---------- */
-+static struct cpufreq_driver bcm2835_cpufreq_driver; /* the cpufreq driver global */
-+static unsigned int min_frequency, max_frequency;
-+static struct cpufreq_frequency_table bcm2835_freq_table[3];
-+
-+/*
-+ ===============================================
-+ clk_rate either gets or sets the clock rates.
-+ ===============================================
-+*/
-+
-+static int bcm2835_cpufreq_clock_property(u32 tag, u32 id, u32 *val)
-+{
-+ struct rpi_firmware *fw = rpi_firmware_get(NULL);
-+ struct {
-+ u32 id;
-+ u32 val;
-+ } packet;
-+ int ret;
-+
-+ packet.id = id;
-+ packet.val = *val;
-+ ret = rpi_firmware_property(fw, tag, &packet, sizeof(packet));
-+ if (ret)
-+ return ret;
-+
-+ *val = packet.val;
-+
-+ return 0;
-+}
-+
-+static uint32_t bcm2835_cpufreq_set_clock(int cur_rate, int arm_rate)
-+{
-+ u32 rate = arm_rate * 1000;
-+ int ret;
-+
-+ ret = bcm2835_cpufreq_clock_property(RPI_FIRMWARE_SET_CLOCK_RATE, VCMSG_ID_ARM_CLOCK, &rate);
-+ if (ret) {
-+ print_err("Failed to set clock: %d (%d)\n", arm_rate, ret);
-+ return 0;
-+ }
-+
-+ rate /= 1000;
-+ print_debug("Setting new frequency = %d -> %d (actual %d)\n", cur_rate, arm_rate, rate);
-+
-+ return rate;
-+}
-+
-+static uint32_t bcm2835_cpufreq_get_clock(int tag)
-+{
-+ u32 rate;
-+ int ret;
-+
-+ ret = bcm2835_cpufreq_clock_property(tag, VCMSG_ID_ARM_CLOCK, &rate);
-+ if (ret) {
-+ print_err("Failed to get clock (%d)\n", ret);
-+ return 0;
-+ }
-+
-+ rate /= 1000;
-+ print_debug("%s frequency = %u\n",
-+ tag == RPI_FIRMWARE_GET_CLOCK_RATE ? "Current":
-+ tag == RPI_FIRMWARE_GET_MIN_CLOCK_RATE ? "Min":
-+ tag == RPI_FIRMWARE_GET_MAX_CLOCK_RATE ? "Max":
-+ "Unexpected", rate);
-+
-+ return 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 */
-+
-+ if (!rpi_firmware_get(NULL)) {
-+ print_err("Firmware is not available\n");
-+ return -ENODEV;
-+ }
-+
-+ /* now find out what the maximum and minimum frequencies are */
-+ min_frequency = bcm2835_cpufreq_get_clock(RPI_FIRMWARE_GET_MIN_CLOCK_RATE);
-+ max_frequency = bcm2835_cpufreq_get_clock(RPI_FIRMWARE_GET_MAX_CLOCK_RATE);
-+
-+ if (min_frequency == max_frequency) {
-+ bcm2835_freq_table[0].frequency = min_frequency;
-+ bcm2835_freq_table[1].frequency = CPUFREQ_TABLE_END;
-+ } else {
-+ bcm2835_freq_table[0].frequency = min_frequency;
-+ bcm2835_freq_table[1].frequency = max_frequency;
-+ bcm2835_freq_table[2].frequency = CPUFREQ_TABLE_END;
-+ }
-+
-+ print_info("min=%d max=%d\n", min_frequency, max_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 = state == 0 ? min_frequency : max_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(RPI_FIRMWARE_GET_CLOCK_RATE);
-+ print_debug("cpu%d: freq=%d\n", cpu, actual_rate);
-+ return actual_rate <= min_frequency ? min_frequency : max_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);
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