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freifunkist-firmware/target/linux/brcm2708/patches-4.14/950-0049-Add-cpufreq-driver...

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brcm2708: add kernel 4.14 support Patch generation process: - rebase rpi/rpi-4.14.y on v4.14.89 from linux-stable - git format-patch v4.14.89 Patches skipped during rebase: - lan78xx: Read MAC address from DT if present - lan78xx: Enable LEDs and auto-negotiation - Revert "softirq: Let ksoftirqd do its job" - sc16is7xx: Fix for multi-channel stall - lan78xx: Ignore DT MAC address if already valid - lan78xx: Simple patch to prevent some crashes - tcp_write_queue_purge clears all the SKBs in the write queue - Revert "lan78xx: Simple patch to prevent some crashes" - lan78xx: Connect phy early - Arm: mm: ftrace: Only set text back to ro after kernel has been marked ro - Revert "Revert "softirq: Let ksoftirqd do its job"" - ASoC: cs4265: SOC_SINGLE register value error fix - Revert "ASoC: cs4265: SOC_SINGLE register value error fix" - Revert "net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends" - Revert "Revert "net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends"" Patches dropped after rebase: - net: Add non-mainline source for rtl8192cu wlan - net: Fix rtl8192cu build errors on other platforms - brcm: adds support for BCM43341 wifi - brcmfmac: Mute expected startup 'errors' - ARM64: Fix build break for RTL8187/RTL8192CU wifi - ARM64: Enable RTL8187/RTL8192CU wifi in build config - This is the driver for Sony CXD2880 DVB-T2/T tuner + demodulator - brcmfmac: add CLM download support - brcmfmac: request_firmware_direct is quieter - Sets the BCDC priority to constant 0 - brcmfmac: Disable ARP offloading when promiscuous - brcmfmac: Avoid possible out-of-bounds read - brcmfmac: Delete redundant length check - net: rtl8192cu: Normalize indentation - net: rtl8192cu: Fix implicit fallthrough warnings - Revert "Sets the BCDC priority to constant 0" - media: cxd2880: Bump to match 4.18.y version - media: cxd2880-spi: Bump to match 4.18.y version - Revert "mm: alloc_contig: re-allow CMA to compact FS pages" - Revert "Revert "mm: alloc_contig: re-allow CMA to compact FS pages"" - cxd2880: CXD2880_SPI_DRV should select DVB_CXD2880 with MEDIA_SUBDRV_AUTOSELECT - 950-0421-HID-hid-bigbenff-driver-for-BigBen-Interactive-PS3OF.patch - 950-0453-Add-hid-bigbenff-to-list-of-have_special_driver-for-.patch Make I2C built-in instead of modular as in upstream defconfig; also the easiest way to get MFD_ARIZONA enabled, which is required by kmod-sound-soc-rpi-cirrus. Add missing compatible strings from 4.9/960-add-rasbperrypi-compatible.patch, using upstream names for compute modules. Add extra patch to enable the LEDs on lan78xx. Compile-tested: bcm2708, bcm2709, bcm2710 (with CONFIG_ALL_KMODS=y) Runtime-tested: bcm2708, bcm2710 Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
6 years ago
From 1466a5baed955602aa2f5283a41b3988794d3caf Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Wed, 3 Jul 2013 00:49:20 +0100
Subject: [PATCH 049/454] 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
@@ -237,6 +237,15 @@ 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
bool "Tegra20 CPUFreq support"
depends on ARCH_TEGRA
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -76,6 +76,7 @@ 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);