1 files changed, 363 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/omap-pm-noop.c b/arch/arm/plat-omap/omap-pm-noop.c
new file mode 100644
index 00000000000..b0471bb2d47
--- /dev/null
+++ b/arch/arm/plat-omap/omap-pm-noop.c
@@ -0,0 +1,363 @@
+/*
+ * omap-pm-noop.c - OMAP power management interface - dummy version
+ *
+ * This code implements the OMAP power management interface to
+ * drivers, CPUIdle, CPUFreq, and DSP Bridge.  It is strictly for
+ * debug/demonstration use, as it does nothing but printk() whenever a
+ * function is called (when DEBUG is defined, below)
+ *
+ * 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, 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 */
+}
+