From 0daa645908304c2447c90b864d7a909f86b9e238 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= Date: Mon, 20 Jul 2015 12:18:36 +0200 Subject: [PATCH 136/222] cpufreq: bcm2835: Use firmware API MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Use the new firmware API instead of the legacy mailbox API. Signed-off-by: Noralf Trønnes --- drivers/cpufreq/bcm2835-cpufreq.c | 117 +++++++++++++++++--------------------- 1 file changed, 53 insertions(+), 64 deletions(-) --- a/drivers/cpufreq/bcm2835-cpufreq.c +++ b/drivers/cpufreq/bcm2835-cpufreq.c @@ -26,7 +26,7 @@ #include #include #include -#include +#include /* ---------- DEFINES ---------- */ /*#define CPUFREQ_DEBUG_ENABLE*/ /* enable debugging */ @@ -43,23 +43,6 @@ #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 */ @@ -74,62 +57,63 @@ static struct cpufreq_frequency_table bc clk_rate either gets or sets the clock rates. =============================================== */ -static uint32_t bcm2835_cpufreq_set_clock(int cur_rate, int arm_rate) + +static int bcm2835_cpufreq_clock_property(u32 tag, u32 id, u32 *val) { - int s, actual_rate=0; - struct vc_msg msg; + 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; - /* wipe all previous message data */ - memset(&msg, 0, sizeof msg); + *val = packet.val; - msg.msg_size = sizeof msg; + return 0; +} - 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; +static uint32_t bcm2835_cpufreq_set_clock(int cur_rate, int arm_rate) +{ + u32 rate = arm_rate * 1000; + int ret; - /* send the message */ - s = bcm_mailbox_property(&msg, sizeof msg); + 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; + } - /* 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; + rate /= 1000; + print_debug("Setting new frequency = %d -> %d (actual %d)\n", cur_rate, arm_rate, rate); - print_debug("Setting new frequency = %d -> %d (actual %d)\n", cur_rate, arm_rate, actual_rate); - return actual_rate; + return 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); + 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 arm_rate; + return rate; } /* @@ -165,9 +149,14 @@ static int bcm2835_cpufreq_driver_init(s /* 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 */ - 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); + bcm2835_freq_table[0].frequency = bcm2835_cpufreq_get_clock(RPI_FIRMWARE_GET_MIN_CLOCK_RATE); + bcm2835_freq_table[1].frequency = bcm2835_cpufreq_get_clock(RPI_FIRMWARE_GET_MAX_CLOCK_RATE); 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); @@ -201,8 +190,8 @@ static int bcm2835_cpufreq_driver_target 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); + 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 <= bcm2835_freq_table[0].frequency ? bcm2835_freq_table[0].frequency : bcm2835_freq_table[1].frequency; }