From: Jean Pihet <j-pihet@xxxxxx> Created arch/arm/plat-omap/omap-pm-constraints.c file from arch/arm/plat-omap/omap-pm-noop.c and the associated Kconfig option OMAP_PM_CONSTRAINTS. Based on the original patch from Vishwanath, cf. https://patchwork.kernel.org/patch/327312/ Cc: Vishwanath BS <vishwanath.bs@xxxxxx> Signed-off-by: Jean Pihet <j-pihet@xxxxxx> --- arch/arm/plat-omap/Kconfig | 7 + arch/arm/plat-omap/Makefile | 1 + arch/arm/plat-omap/omap-pm-constraints.c | 363 ++++++++++++++++++++++++++++++ 3 files changed, 371 insertions(+), 0 deletions(-) create mode 100644 arch/arm/plat-omap/omap-pm-constraints.c diff --git a/arch/arm/plat-omap/Kconfig b/arch/arm/plat-omap/Kconfig index cd5f993..54eb965 100644 --- a/arch/arm/plat-omap/Kconfig +++ b/arch/arm/plat-omap/Kconfig @@ -215,6 +215,13 @@ config OMAP_PM_NONE config OMAP_PM_NOOP bool "No-op/debug PM layer" +config OMAP_PM_CONSTRAINTS + depends on PM + bool "Per device constraints" + help + Select this option to enable the PM layer plugin for + the per-device constraints support + endchoice endmenu diff --git a/arch/arm/plat-omap/Makefile b/arch/arm/plat-omap/Makefile index a4a1285..a293367 100644 --- a/arch/arm/plat-omap/Makefile +++ b/arch/arm/plat-omap/Makefile @@ -32,3 +32,4 @@ obj-y += $(i2c-omap-m) $(i2c-omap-y) obj-$(CONFIG_OMAP_MBOX_FWK) += mailbox.o obj-$(CONFIG_OMAP_PM_NOOP) += omap-pm-noop.o +obj-$(CONFIG_OMAP_PM_CONSTRAINTS) += omap-pm-constraints.o diff --git a/arch/arm/plat-omap/omap-pm-constraints.c b/arch/arm/plat-omap/omap-pm-constraints.c new file mode 100644 index 0000000..c8b4e4c --- /dev/null +++ b/arch/arm/plat-omap/omap-pm-constraints.c @@ -0,0 +1,363 @@ +/* + * omap-pm.c - OMAP power management interface + * + * This code implements the OMAP power management interface to + * drivers, CPUIdle, CPUFreq, and DSP Bridge. + * + * Copyright (C) 2008-2009 Texas Instruments, Inc. + * Copyright (C) 2008-2009 Nokia Corporation + * Paul Walmsley + * + * Interface developed by (in alphabetical order): + * Karthik Dasu, Tony Lindgren, Jean Pihet, Rajendra Nayak, Sakari Poussa, + * Veeramanikandan Raju, Anand Sawant, Igor Stoppa, Paul Walmsley, + * Richard Woodruff + */ + +#undef DEBUG + +#include <linux/init.h> +#include <linux/cpufreq.h> +#include <linux/device.h> +#include <linux/platform_device.h> + +/* Interface documentation is in mach/omap-pm.h */ +#include <plat/omap-pm.h> +#include <plat/omap_device.h> + +static bool off_mode_enabled; +static u32 dummy_context_loss_counter; + +/* + * Device-driver-originated constraints (via board-*.c files) + */ + +int omap_pm_set_max_mpu_wakeup_lat(struct device *dev, long t) +{ + if (!dev || t < -1) { + WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__); + return -EINVAL; + }; + + if (t == -1) + pr_debug("OMAP PM: remove max MPU wakeup latency constraint: " + "dev %s\n", dev_name(dev)); + else + pr_debug("OMAP PM: add max MPU wakeup latency constraint: " + "dev %s, t = %ld usec\n", dev_name(dev), t); + + /* + * For current Linux, this needs to map the MPU to a + * powerdomain, then go through the list of current max lat + * constraints on the MPU and find the smallest. If + * the latency constraint has changed, the code should + * recompute the state to enter for the next powerdomain + * state. + * + * TI CDP code can call constraint_set here. + */ + + return 0; +} + +int omap_pm_set_min_bus_tput(struct device *dev, u8 agent_id, unsigned long r) +{ + if (!dev || (agent_id != OCP_INITIATOR_AGENT && + agent_id != OCP_TARGET_AGENT)) { + WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__); + return -EINVAL; + }; + + if (r == 0) + pr_debug("OMAP PM: remove min bus tput constraint: " + "dev %s for agent_id %d\n", dev_name(dev), agent_id); + else + pr_debug("OMAP PM: add min bus tput constraint: " + "dev %s for agent_id %d: rate %ld KiB\n", + dev_name(dev), agent_id, r); + + /* + * This code should model the interconnect and compute the + * required clock frequency, convert that to a VDD2 OPP ID, then + * set the VDD2 OPP appropriately. + * + * TI CDP code can call constraint_set here on the VDD2 OPP. + */ + + return 0; +} + +int omap_pm_set_max_dev_wakeup_lat(struct device *req_dev, struct device *dev, + long t) +{ + if (!req_dev || !dev || t < -1) { + WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__); + return -EINVAL; + }; + + if (t == -1) + pr_debug("OMAP PM: remove max device latency constraint: " + "dev %s\n", dev_name(dev)); + else + pr_debug("OMAP PM: add max device latency constraint: " + "dev %s, t = %ld usec\n", dev_name(dev), t); + + /* + * For current Linux, this needs to map the device to a + * powerdomain, then go through the list of current max lat + * constraints on that powerdomain and find the smallest. If + * the latency constraint has changed, the code should + * recompute the state to enter for the next powerdomain + * state. Conceivably, this code should also determine + * whether to actually disable the device clocks or not, + * depending on how long it takes to re-enable the clocks. + * + * TI CDP code can call constraint_set here. + */ + + return 0; +} + +int omap_pm_set_max_sdma_lat(struct device *dev, long t) +{ + if (!dev || t < -1) { + WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__); + return -EINVAL; + }; + + if (t == -1) + pr_debug("OMAP PM: remove max DMA latency constraint: " + "dev %s\n", dev_name(dev)); + else + pr_debug("OMAP PM: add max DMA latency constraint: " + "dev %s, t = %ld usec\n", dev_name(dev), t); + + /* + * For current Linux PM QOS params, this code should scan the + * list of maximum CPU and DMA latencies and select the + * smallest, then set cpu_dma_latency pm_qos_param + * accordingly. + * + * For future Linux PM QOS params, with separate CPU and DMA + * latency params, this code should just set the dma_latency param. + * + * TI CDP code can call constraint_set here. + */ + + return 0; +} + +int omap_pm_set_min_clk_rate(struct device *dev, struct clk *c, long r) +{ + if (!dev || !c || r < 0) { + WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__); + return -EINVAL; + } + + if (r == 0) + pr_debug("OMAP PM: remove min clk rate constraint: " + "dev %s\n", dev_name(dev)); + else + pr_debug("OMAP PM: add min clk rate constraint: " + "dev %s, rate = %ld Hz\n", dev_name(dev), r); + + /* + * Code in a real implementation should keep track of these + * constraints on the clock, and determine the highest minimum + * clock rate. It should iterate over each OPP and determine + * whether the OPP will result in a clock rate that would + * satisfy this constraint (and any other PM constraint in effect + * at that time). Once it finds the lowest-voltage OPP that + * meets those conditions, it should switch to it, or return + * an error if the code is not capable of doing so. + */ + + return 0; +} + +/* + * DSP Bridge-specific constraints + */ + +const struct omap_opp *omap_pm_dsp_get_opp_table(void) +{ + pr_debug("OMAP PM: DSP request for OPP table\n"); + + /* + * Return DSP frequency table here: The final item in the + * array should have .rate = .opp_id = 0. + */ + + return NULL; +} + +void omap_pm_dsp_set_min_opp(u8 opp_id) +{ + if (opp_id == 0) { + WARN_ON(1); + return; + } + + pr_debug("OMAP PM: DSP requests minimum VDD1 OPP to be %d\n", opp_id); + + /* + * + * For l-o dev tree, our VDD1 clk is keyed on OPP ID, so we + * can just test to see which is higher, the CPU's desired OPP + * ID or the DSP's desired OPP ID, and use whichever is + * highest. + * + * In CDP12.14+, the VDD1 OPP custom clock that controls the DSP + * rate is keyed on MPU speed, not the OPP ID. So we need to + * map the OPP ID to the MPU speed for use with clk_set_rate() + * if it is higher than the current OPP clock rate. + * + */ +} + + +u8 omap_pm_dsp_get_opp(void) +{ + pr_debug("OMAP PM: DSP requests current DSP OPP ID\n"); + + /* + * For l-o dev tree, call clk_get_rate() on VDD1 OPP clock + * + * CDP12.14+: + * Call clk_get_rate() on the OPP custom clock, map that to an + * OPP ID using the tables defined in board-*.c/chip-*.c files. + */ + + return 0; +} + +/* + * CPUFreq-originated constraint + * + * In the future, this should be handled by custom OPP clocktype + * functions. + */ + +struct cpufreq_frequency_table **omap_pm_cpu_get_freq_table(void) +{ + pr_debug("OMAP PM: CPUFreq request for frequency table\n"); + + /* + * Return CPUFreq frequency table here: loop over + * all VDD1 clkrates, pull out the mpu_ck frequencies, build + * table + */ + + return NULL; +} + +void omap_pm_cpu_set_freq(unsigned long f) +{ + if (f == 0) { + WARN_ON(1); + return; + } + + pr_debug("OMAP PM: CPUFreq requests CPU frequency to be set to %lu\n", + f); + + /* + * For l-o dev tree, determine whether MPU freq or DSP OPP id + * freq is higher. Find the OPP ID corresponding to the + * higher frequency. Call clk_round_rate() and clk_set_rate() + * on the OPP custom clock. + * + * CDP should just be able to set the VDD1 OPP clock rate here. + */ +} + +unsigned long omap_pm_cpu_get_freq(void) +{ + pr_debug("OMAP PM: CPUFreq requests current CPU frequency\n"); + + /* + * Call clk_get_rate() on the mpu_ck. + */ + + return 0; +} + +/** + * omap_pm_enable_off_mode - notify OMAP PM that off-mode is enabled + * + * Intended for use only by OMAP PM core code to notify this layer + * that off mode has been enabled. + */ +void omap_pm_enable_off_mode(void) +{ + off_mode_enabled = true; +} + +/** + * omap_pm_disable_off_mode - notify OMAP PM that off-mode is disabled + * + * Intended for use only by OMAP PM core code to notify this layer + * that off mode has been disabled. + */ +void omap_pm_disable_off_mode(void) +{ + off_mode_enabled = false; +} + +/* + * Device context loss tracking + */ + +#ifdef CONFIG_ARCH_OMAP2PLUS + +u32 omap_pm_get_dev_context_loss_count(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + u32 count; + + if (WARN_ON(!dev)) + return 0; + + if (dev->parent == &omap_device_parent) { + count = omap_device_get_context_loss_count(pdev); + } else { + WARN_ONCE(off_mode_enabled, "omap_pm: using dummy context " + "loss counter; device %s should be converted to " + "omap_device", dev_name(dev)); + if (off_mode_enabled) + dummy_context_loss_counter++; + count = dummy_context_loss_counter; + } + + pr_debug("OMAP PM: context loss count for dev %s = %d\n", + dev_name(dev), count); + + return count; +} + +#else + +u32 omap_pm_get_dev_context_loss_count(struct device *dev) +{ + return dummy_context_loss_counter; +} + +#endif + +/* Should be called before clk framework init */ +int __init omap_pm_if_early_init(void) +{ + return 0; +} + +/* Must be called after clock framework is initialized */ +int __init omap_pm_if_init(void) +{ + return 0; +} + +void omap_pm_if_exit(void) +{ + /* Deallocate CPUFreq frequency table here */ +} + -- 1.7.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
