Adds SRF calls into OMAP PM skeleton layer developed by Paul W.
Signed-off-by: Rajendra Nayak <rnayak@xxxxxx>
---
arch/arm/mach-omap2/Makefile | 1
arch/arm/mach-omap2/clockdomain.c | 7
arch/arm/plat-omap/Kconfig | 3
arch/arm/plat-omap/Makefile | 4
arch/arm/plat-omap/omap-pm-srf.c | 367 ++++++++++++++++++++++++++++++++
include/asm-arm/arch-omap/powerdomain.h | 1
include/asm-arm/arch-omap/resource.h | 1
7 files changed, 383 insertions(+), 1 deletion(-)
Index: linux-omap-2.6/arch/arm/plat-omap/omap-pm-srf.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-omap-2.6/arch/arm/plat-omap/omap-pm-srf.c 2008-08-11
17:38:37.000000000 +0530
@@ -0,0 +1,367 @@
+/*
+ * omap-pm-srf.c - OMAP power management interface implemented
+ * using Shared resource framework
+ *
+ * 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 Texas Instruments, Inc.
+ * Copyright (C) 2008 Nokia Corporation
+ * Paul Walmsley
+ *
+ * Interface developed by (in alphabetical order):
+ * Karthik Dasu, Amish Lakhani, Tony Lindgren, Rajendra Nayak, Sakari
+ * Poussa, Veeramanikandan Raju, Igor Stoppa, Paul Walmsley, Richard
+ * Woodruff
+ *
+ * Interfaces defined by Paul Walmsley
+ * Updated with SRF calls by Rajendra Nayak
+ */
+
+#undef DEBUG
+
+#include <linux/init.h>
+#include <linux/cpufreq.h>
+#include <linux/device.h>
+
+/* Interface documentation is in asm/arch/omap-pm.h */
+#include <asm/arch/omap-pm.h>
+
+#include <asm/arch/powerdomain.h>
+#include <asm/arch/resource.h>
+/*
+#include <asm/arch/tiocp.h>
+*/
+
+#define LAT_RES_POSTAMBLE "_latency"
+char latency_res_name[30];
+/* lat_name_mutex protects latency_res_name*/
+static DEFINE_MUTEX(lat_name_mutex);
+
+
+/**
+ * get_lat_res_name - gets the latency resource name given a power domain name
+ * @pwrdm_name: Name of the power domain.
+ *
+ * Returns a pointer to the latency resource name.
+ */
+static char *get_lat_res_name(const char *pwrdm_name)
+{
+ strcpy(latency_res_name, "");
+ if (!(in_atomic() || irqs_disabled()))
+ mutex_lock(&lat_name_mutex);
+ WARN_ON(strlen(pwrdm_name) + strlen(LAT_RES_POSTAMBLE) >
+ sizeof(latency_res_name));
+ strcpy(latency_res_name, pwrdm_name);
+ strcat(latency_res_name, LAT_RES_POSTAMBLE);
+ if (!(in_atomic() || irqs_disabled()))
+ mutex_unlock(&lat_name_mutex);
+ return latency_res_name;
+}
+
+static struct omap_opp *dsp_opps;
+static struct omap_opp *mpu_opps;
+
+/*
+ * Device-driver-originated constraints (via board-*.c files)
+ */
+
+void omap_pm_set_max_mpu_wakeup_lat(struct device *dev, long t)
+{
+ if (!dev || t < -1) {
+ WARN_ON(1);
+ return;
+ };
+
+ if (t == -1) {
+ pr_debug("OMAP PM: remove max MPU wakeup latency constraint: "
+ "dev %s\n", dev_name(dev));
+ resource_release("mpu_latency", dev);
+ } else {
+ pr_debug("OMAP PM: add max MPU wakeup latency constraint: "
+ "dev %s, t = %ld usec\n", dev_name(dev), t);
+ resource_request("mpu_latency", dev, t);
+ }
+}
+
+void 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_ON(1);
+ return;
+ };
+
+ 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.
+ */
+}
+
+void omap_pm_set_max_dev_wakeup_lat(struct device *dev, long t)
+{
+ /* struct tiocp *tiocp_dev; */
+ struct powerdomain *pwrdm_dev;
+ char *res_name;
+
+ if (!dev || t < -1) {
+ WARN_ON(1);
+ return;
+ };
+ /* Look for the devices Power Domain */
+ /* TODO: Put this back in once tiocp layer is available
+ tiocp_dev = container_of(dev, struct tiocp, dev);
+ pwrdm_dev = tiocp_dev->pwrdm;
+ */
+
+ if (t == -1) {
+ pr_debug("OMAP PM: remove max device latency constraint: "
+ "dev %s\n", dev_name(dev));
+ res_name = get_lat_res_name(pwrdm_dev->name);
+ resource_release(res_name, dev);
+ } else {
+ pr_debug("OMAP PM: add max device latency constraint: "
+ "dev %s, t = %ld usec\n", dev_name(dev), t);
+ res_name = get_lat_res_name(pwrdm_dev->name);
+ resource_request(res_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.
+ */
+}
+
+void omap_pm_set_max_sdma_lat(struct device *dev, long t)
+{
+ if (!dev || t < -1) {
+ WARN_ON(1);
+ return;
+ };
+
+ if (t == -1) {
+ pr_debug("OMAP PM: remove max DMA latency constraint: "
+ "dev %s\n", dev_name(dev));
+ resource_release("core_latency", dev);
+ } else {
+ pr_debug("OMAP PM: add max DMA latency constraint: "
+ "dev %s, t = %ld usec\n", dev_name(dev), t);
+ resource_request("core_latency", 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.
+ */
+
+}
+
+
+/*
+ * 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;
+}
+
+struct device omap_pm_dev;
+
+/*
+ * Powerdomain usecounting hooks
+ */
+
+void omap_pm_pwrdm_active(struct powerdomain *pwrdm)
+{
+ char *res_name;
+
+ if (!pwrdm) {
+ WARN_ON(1);
+ return;
+ };
+
+ if (!strcmp(pwrdm->name, "wkup_pwrdm") ||
+ !strcmp(pwrdm->name, "core_pwrdm"))
+ return;
+
+ pr_debug("OMAP PM: powerdomain %s is becoming active\n", pwrdm->name);
+
+ res_name = get_lat_res_name(pwrdm->name);
+ /* Request for a zero latency which puts the Power Domain in ON state*/
+ resource_request(res_name, &omap_pm_dev, 0);
+ return;
+}
+
+void omap_pm_pwrdm_inactive(struct powerdomain *pwrdm)
+{
+ char *res_name;
+
+ if (!pwrdm) {
+ WARN_ON(1);
+ return;
+ };
+
+ if (!strcmp(pwrdm->name, "wkup_pwrdm") ||
+ !strcmp(pwrdm->name, "core_pwrdm"))
+ return;
+
+ pr_debug("OMAP PM: powerdomain %s is becoming inactive\n",
+ pwrdm->name);
+
+ res_name = get_lat_res_name(pwrdm->name);
+ /* Release the latency requested */
+ resource_release(res_name, &omap_pm_dev);
+ return;
+}
+
+/*
+ * Should be called before clk framework since clk fw will call
+ * omap_pm_pwrdm_{in,}active()
+ */
+int __init omap_pm_if_early_init(void)
+{
+ return 0;
+}
+
+/* Must be called after clock framework is initialized */
+int __init omap_pm_if_init(struct omap_opp *mpu_opp_table,
+ struct omap_opp *dsp_opp_table)
+{
+ mpu_opps = mpu_opp_table;
+ dsp_opps = dsp_opp_table;
+ resource_init(resources_omap);
+ return 0;
+}
+
+void omap_pm_if_exit(void)
+{
+ /* Deallocate CPUFreq frequency table here */
+}
+
Index: linux-omap-2.6/arch/arm/mach-omap2/clockdomain.c
===================================================================
--- linux-omap-2.6.orig/arch/arm/mach-omap2/clockdomain.c 2008-08-11
17:12:19.000000000 +0530
+++ linux-omap-2.6/arch/arm/mach-omap2/clockdomain.c 2008-08-11
17:14:31.000000000 +0530
@@ -35,6 +35,7 @@
#include <asm/arch/powerdomain.h>
#include <asm/arch/clockdomain.h>
+#include <asm/arch/omap-pm.h>
/* clkdm_list contains all registered struct clockdomains */
static LIST_HEAD(clkdm_list);
@@ -561,6 +562,9 @@ int omap2_clkdm_clk_enable(struct clockd
else
omap2_clkdm_wakeup(clkdm);
+ /*Hook to inform the OMAP PM layer that the pwrdm has become active */
+ omap_pm_pwrdm_active(clkdm->pwrdm.ptr);
+
return 0;
}
@@ -612,6 +616,9 @@ int omap2_clkdm_clk_disable(struct clock
else
omap2_clkdm_sleep(clkdm);
+ /*Hook to inform the OMAP PM layer that the pwrdm has become inactive */
+ omap_pm_pwrdm_inactive(clkdm->pwrdm.ptr);
+
return 0;
}
Index: linux-omap-2.6/include/asm-arm/arch-omap/powerdomain.h
===================================================================
--- linux-omap-2.6.orig/include/asm-arm/arch-omap/powerdomain.h 2008-08-11
17:12:19.000000000 +0530
+++ linux-omap-2.6/include/asm-arm/arch-omap/powerdomain.h 2008-08-11
17:14:31.000000000 +0530
@@ -148,6 +148,7 @@ int pwrdm_read_next_pwrst(struct powerdo
int pwrdm_read_pwrst(struct powerdomain *pwrdm);
int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm);
int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm);
+int pwrdm_read_pwrst(struct powerdomain *pwrdm);
int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst);
int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst);
Index: linux-omap-2.6/arch/arm/mach-omap2/Makefile
===================================================================
--- linux-omap-2.6.orig/arch/arm/mach-omap2/Makefile 2008-08-11
17:12:19.000000000 +0530
+++ linux-omap-2.6/arch/arm/mach-omap2/Makefile 2008-08-11 17:14:31.000000000
+0530
@@ -34,6 +34,7 @@ obj-$(CONFIG_OMAP_SMARTREFLEX) += smart
# Clock framework
obj-$(CONFIG_ARCH_OMAP2) += clock24xx.o
obj-$(CONFIG_ARCH_OMAP3) += clock34xx.o
+obj-$(CONFIG_OMAP_PM_SRF) += resource34xx.o
# DSP
obj-$(CONFIG_OMAP_MMU_FWK) += mmu_mach.o
Index: linux-omap-2.6/arch/arm/plat-omap/Kconfig
===================================================================
--- linux-omap-2.6.orig/arch/arm/plat-omap/Kconfig 2008-08-11
17:12:25.000000000 +0530
+++ linux-omap-2.6/arch/arm/plat-omap/Kconfig 2008-08-11 17:14:31.000000000 +0530
@@ -258,6 +258,9 @@ config OMAP_PM_NONE
config OMAP_PM_NOOP
bool "No-op/debug PM layer"
+config OMAP_PM_SRF
+ bool "PM layer implemented using SRF"
+
endchoice
endif
Index: linux-omap-2.6/arch/arm/plat-omap/Makefile
===================================================================
--- linux-omap-2.6.orig/arch/arm/plat-omap/Makefile 2008-08-11
17:12:25.000000000 +0530
+++ linux-omap-2.6/arch/arm/plat-omap/Makefile 2008-08-11 17:14:31.000000000 +0530
@@ -29,4 +29,6 @@ obj-$(CONFIG_OMAP_MMU_FWK) += mmu.o
# OMAP mailbox framework
obj-$(CONFIG_OMAP_MBOX_FWK) += mailbox.o
-obj-$(CONFIG_OMAP_PM_NOOP) += omap-pm-noop.o
\ No newline at end of file
+obj-$(CONFIG_OMAP_PM_NOOP) += omap-pm-noop.o
+obj-$(CONFIG_OMAP_PM_SRF) += omap-pm-srf.o \
+ resource.o
Index: linux-omap-2.6/include/asm-arm/arch-omap/resource.h
===================================================================
--- linux-omap-2.6.orig/include/asm-arm/arch-omap/resource.h 2008-08-11
17:12:30.000000000 +0530
+++ linux-omap-2.6/include/asm-arm/arch-omap/resource.h 2008-08-11
17:14:31.000000000 +0530
@@ -85,6 +85,7 @@ struct users_list {
u8 usage;
};
+extern struct shared_resource *resources_omap[];
/* Shared resource Framework API's */
void resource_init(struct shared_resource **resources);
int resource_register(struct shared_resource *res);
--
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