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This change makes the names of Broadcom targets consistent by using the common notation based on SoC/CPU ID (which is used internally anyway), bcmXXXX instead of brcmXXXX. This is even used for target TITLE in make menuconfig already, only the short target name used brcm so far. Despite, since subtargets range from bcm2708 to bcm2711, it seems appropriate to use bcm27xx instead of bcm2708 (again, as already done for BOARDNAME). This also renames the packages brcm2708-userland and brcm2708-gpu-fw. Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de> Acked-by: Álvaro Fernández Rojas <noltari@gmail.com>
260 lines
8.0 KiB
Diff
260 lines
8.0 KiB
Diff
From 0a248af6e18d7f1ad57fffa7f588bc8a5851832e Mon Sep 17 00:00:00 2001
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From: popcornmix <popcornmix@gmail.com>
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Date: Wed, 3 Jul 2013 00:49:20 +0100
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Subject: [PATCH] Add cpufreq driver
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Signed-off-by: popcornmix <popcornmix@gmail.com>
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bcm2835-cpufreq: Change licence to GPLv2
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Signed-off-by: Eben Upton <eben.upton@broadcom.com>
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Signed-off-by: Dom Cobley <dom@raspberrypi.com>
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---
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drivers/cpufreq/Kconfig.arm | 9 ++
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drivers/cpufreq/Makefile | 1 +
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drivers/cpufreq/bcm2835-cpufreq.c | 210 ++++++++++++++++++++++++++++++
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3 files changed, 220 insertions(+)
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create mode 100644 drivers/cpufreq/bcm2835-cpufreq.c
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--- a/drivers/cpufreq/Kconfig.arm
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+++ b/drivers/cpufreq/Kconfig.arm
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@@ -260,6 +260,15 @@ config ARM_TANGO_CPUFREQ
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depends on CPUFREQ_DT && ARCH_TANGO
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default y
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+config ARM_BCM2835_CPUFREQ
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+ depends on RASPBERRYPI_FIRMWARE
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+ bool "BCM2835 Driver"
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+ default y
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+ help
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+ This adds the CPUFreq driver for BCM2835
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+
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+ If in doubt, say N.
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+
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config ARM_TEGRA20_CPUFREQ
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tristate "Tegra20 CPUFreq support"
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depends on ARCH_TEGRA
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--- a/drivers/cpufreq/Makefile
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+++ b/drivers/cpufreq/Makefile
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@@ -80,6 +80,7 @@ obj-$(CONFIG_ARM_SCPI_CPUFREQ) += scpi-
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obj-$(CONFIG_ARM_SPEAR_CPUFREQ) += spear-cpufreq.o
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obj-$(CONFIG_ARM_STI_CPUFREQ) += sti-cpufreq.o
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obj-$(CONFIG_ARM_TANGO_CPUFREQ) += tango-cpufreq.o
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+obj-$(CONFIG_ARM_BCM2835_CPUFREQ) += bcm2835-cpufreq.o
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obj-$(CONFIG_ARM_TEGRA20_CPUFREQ) += tegra20-cpufreq.o
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obj-$(CONFIG_ARM_TEGRA124_CPUFREQ) += tegra124-cpufreq.o
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obj-$(CONFIG_ARM_TEGRA186_CPUFREQ) += tegra186-cpufreq.o
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--- /dev/null
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+++ b/drivers/cpufreq/bcm2835-cpufreq.c
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@@ -0,0 +1,210 @@
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+/*
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+ * Copyright 2011 Broadcom Corporation.
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * as published by the Free Software Foundation; version 2
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+ * of the License.
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+ *
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+ * This driver dynamically manages the CPU Frequency of the ARM
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+ * processor. Messages are sent to Videocore either setting or requesting the
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+ * frequency of the ARM in order to match an appropiate frequency to the current
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+ * usage of the processor. The policy which selects the frequency to use is
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+ * defined in the kernel .config file, but can be changed during runtime.
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+ */
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+
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+/* ---------- INCLUDES ---------- */
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+#include <linux/kernel.h>
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+#include <linux/init.h>
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+#include <linux/module.h>
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+#include <linux/cpufreq.h>
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+#include <soc/bcm2835/raspberrypi-firmware.h>
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+
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+/* ---------- DEFINES ---------- */
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+/*#define CPUFREQ_DEBUG_ENABLE*/ /* enable debugging */
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+#define MODULE_NAME "bcm2835-cpufreq"
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+
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+#define VCMSG_ID_ARM_CLOCK 0x000000003 /* Clock/Voltage ID's */
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+
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+/* debug printk macros */
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+#ifdef CPUFREQ_DEBUG_ENABLE
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+#define print_debug(fmt,...) pr_debug("%s:%s:%d: "fmt, MODULE_NAME, __func__, __LINE__, ##__VA_ARGS__)
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+#else
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+#define print_debug(fmt,...)
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+#endif
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+#define print_err(fmt,...) pr_err("%s:%s:%d: "fmt, MODULE_NAME, __func__,__LINE__, ##__VA_ARGS__)
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+#define print_info(fmt,...) pr_info("%s: "fmt, MODULE_NAME, ##__VA_ARGS__)
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+
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+/* ---------- GLOBALS ---------- */
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+static struct cpufreq_driver bcm2835_cpufreq_driver; /* the cpufreq driver global */
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+static unsigned int min_frequency, max_frequency;
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+static struct cpufreq_frequency_table bcm2835_freq_table[3];
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+
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+/*
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+ ===============================================
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+ clk_rate either gets or sets the clock rates.
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+ ===============================================
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+*/
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+
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+static int bcm2835_cpufreq_clock_property(u32 tag, u32 id, u32 *val)
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+{
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+ struct rpi_firmware *fw = rpi_firmware_get(NULL);
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+ struct {
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+ u32 id;
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+ u32 val;
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+ } packet;
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+ int ret;
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+
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+ packet.id = id;
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+ packet.val = *val;
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+ ret = rpi_firmware_property(fw, tag, &packet, sizeof(packet));
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+ if (ret)
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+ return ret;
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+
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+ *val = packet.val;
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+
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+ return 0;
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+}
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+
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+static uint32_t bcm2835_cpufreq_set_clock(int cur_rate, int arm_rate)
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+{
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+ u32 rate = arm_rate * 1000;
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+ int ret;
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+
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+ ret = bcm2835_cpufreq_clock_property(RPI_FIRMWARE_SET_CLOCK_RATE, VCMSG_ID_ARM_CLOCK, &rate);
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+ if (ret) {
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+ print_err("Failed to set clock: %d (%d)\n", arm_rate, ret);
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+ return 0;
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+ }
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+
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+ rate /= 1000;
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+ print_debug("Setting new frequency = %d -> %d (actual %d)\n", cur_rate, arm_rate, rate);
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+
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+ return rate;
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+}
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+
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+static uint32_t bcm2835_cpufreq_get_clock(int tag)
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+{
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+ u32 rate;
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+ int ret;
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+
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+ ret = bcm2835_cpufreq_clock_property(tag, VCMSG_ID_ARM_CLOCK, &rate);
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+ if (ret) {
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+ print_err("Failed to get clock (%d)\n", ret);
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+ return 0;
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+ }
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+
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+ rate /= 1000;
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+ print_debug("%s frequency = %u\n",
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+ tag == RPI_FIRMWARE_GET_CLOCK_RATE ? "Current":
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+ tag == RPI_FIRMWARE_GET_MIN_CLOCK_RATE ? "Min":
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+ tag == RPI_FIRMWARE_GET_MAX_CLOCK_RATE ? "Max":
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+ "Unexpected", rate);
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+
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+ return rate;
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+}
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+
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+/*
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+ ====================================================
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+ Module Initialisation registers the cpufreq driver
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+ ====================================================
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+*/
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+static int __init bcm2835_cpufreq_module_init(void)
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+{
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+ print_debug("IN\n");
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+ return cpufreq_register_driver(&bcm2835_cpufreq_driver);
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+}
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+
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+/*
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+ =============
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+ Module exit
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+ =============
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+*/
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+static void __exit bcm2835_cpufreq_module_exit(void)
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+{
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+ print_debug("IN\n");
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+ cpufreq_unregister_driver(&bcm2835_cpufreq_driver);
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+ return;
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+}
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+
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+/*
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+ ==============================================================
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+ Initialisation function sets up the CPU policy for first use
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+ ==============================================================
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+*/
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+static int bcm2835_cpufreq_driver_init(struct cpufreq_policy *policy)
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+{
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+ /* measured value of how long it takes to change frequency */
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+ const unsigned int transition_latency = 355000; /* ns */
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+
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+ if (!rpi_firmware_get(NULL)) {
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+ print_err("Firmware is not available\n");
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+ return -ENODEV;
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+ }
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+
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+ /* now find out what the maximum and minimum frequencies are */
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+ min_frequency = bcm2835_cpufreq_get_clock(RPI_FIRMWARE_GET_MIN_CLOCK_RATE);
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+ max_frequency = bcm2835_cpufreq_get_clock(RPI_FIRMWARE_GET_MAX_CLOCK_RATE);
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+
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+ if (min_frequency == max_frequency) {
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+ bcm2835_freq_table[0].frequency = min_frequency;
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+ bcm2835_freq_table[1].frequency = CPUFREQ_TABLE_END;
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+ } else {
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+ bcm2835_freq_table[0].frequency = min_frequency;
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+ bcm2835_freq_table[1].frequency = max_frequency;
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+ bcm2835_freq_table[2].frequency = CPUFREQ_TABLE_END;
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+ }
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+
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+ print_info("min=%d max=%d\n", min_frequency, max_frequency);
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+ return cpufreq_generic_init(policy, bcm2835_freq_table, transition_latency);
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+}
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+
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+/*
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+ =====================================================================
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+ Target index function chooses the requested frequency from the table
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+ =====================================================================
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+*/
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+
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+static int bcm2835_cpufreq_driver_target_index(struct cpufreq_policy *policy, unsigned int state)
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+{
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+ unsigned int target_freq = state == 0 ? min_frequency : max_frequency;
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+ unsigned int cur = bcm2835_cpufreq_set_clock(policy->cur, target_freq);
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+
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+ if (!cur)
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+ {
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+ print_err("Error occurred setting a new frequency (%d)\n", target_freq);
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+ return -EINVAL;
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+ }
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+ print_debug("%s: %i: freq %d->%d\n", policy->governor->name, state, policy->cur, cur);
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+ return 0;
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+}
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+
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+/*
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+ ======================================================
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+ Get function returns the current frequency from table
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+ ======================================================
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+*/
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+
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+static unsigned int bcm2835_cpufreq_driver_get(unsigned int cpu)
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+{
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+ unsigned int actual_rate = bcm2835_cpufreq_get_clock(RPI_FIRMWARE_GET_CLOCK_RATE);
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+ print_debug("cpu%d: freq=%d\n", cpu, actual_rate);
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+ return actual_rate <= min_frequency ? min_frequency : max_frequency;
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+}
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+
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+/* the CPUFreq driver */
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+static struct cpufreq_driver bcm2835_cpufreq_driver = {
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+ .name = "BCM2835 CPUFreq",
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+ .init = bcm2835_cpufreq_driver_init,
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+ .verify = cpufreq_generic_frequency_table_verify,
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+ .target_index = bcm2835_cpufreq_driver_target_index,
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+ .get = bcm2835_cpufreq_driver_get,
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+ .attr = cpufreq_generic_attr,
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+};
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+
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+MODULE_AUTHOR("Dorian Peake and Dom Cobley");
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+MODULE_DESCRIPTION("CPU frequency driver for BCM2835 chip");
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+MODULE_LICENSE("GPL");
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+
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+module_init(bcm2835_cpufreq_module_init);
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+module_exit(bcm2835_cpufreq_module_exit);
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