msm: copper: Low Power Resource manager driver
Code changes to add support for Low Power Resource Manager Driver.
This code will manage PXO, VDD dig and Vdd mem based on the idle
mode the kernel chooses and updates the RPM sleep vote accordingly.
Change-Id: If3af14920e17c010c8e77b550ab57d532b32e6cd
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>
diff --git a/arch/arm/mach-msm/lpm_resources.h b/arch/arm/mach-msm/lpm_resources.h
new file mode 100644
index 0000000..9973fbf
--- /dev/null
+++ b/arch/arm/mach-msm/lpm_resources.h
@@ -0,0 +1,128 @@
+/* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __ARCH_ARM_MACH_MSM_LPM_RESOURCES_H
+#define __ARCH_ARM_MACH_MSM_LPM_RESOURCES_H
+
+#include "pm.h"
+
+enum {
+ MSM_LPM_PXO_OFF = 0,
+ MSM_LPM_PXO_ON = 1,
+};
+
+enum {
+ MSM_LPM_L2_CACHE_HSFS_OPEN = 0,
+ MSM_LPM_L2_CACHE_GDHS = 1,
+ MSM_LPM_L2_CACHE_RETENTION = 2,
+ MSM_LPM_L2_CACHE_ACTIVE = 3,
+};
+
+struct msm_rpmrs_limits {
+ uint32_t pxo;
+ uint32_t l2_cache;
+ uint32_t vdd_mem_upper_bound;
+ uint32_t vdd_mem_lower_bound;
+ uint32_t vdd_dig_upper_bound;
+ uint32_t vdd_dig_lower_bound;
+
+ uint32_t latency_us[NR_CPUS];
+ uint32_t power[NR_CPUS];
+};
+
+struct msm_rpmrs_level {
+ enum msm_pm_sleep_mode sleep_mode;
+ struct msm_rpmrs_limits rs_limits;
+ bool available;
+ uint32_t latency_us;
+ uint32_t steady_state_power;
+ uint32_t energy_overhead;
+ uint32_t time_overhead_us;
+};
+
+#ifdef CONFIG_MSM_RPM_SMD
+
+/**
+ * msm_lpm_level_beyond_limit() - Check if the resources in a low power level
+ * is beyond the limits of the driver votes received for those resources.This
+ * function is used by lpm_levels to eliminate any low power level that cannot
+ * be entered.
+ *
+ * @limits: pointer to the resource limits of a low power level.
+ *
+ * returns true if the resource limits are beyond driver resource votes.
+ * false otherwise.
+ */
+bool msm_lpm_level_beyond_limit(struct msm_rpmrs_limits *limits);
+
+/**
+ * msm_lpmrs_enter_sleep() - Enter sleep flushes the sleep votes of low power
+ * resources to the RPM driver, also configure the MPM if needed depending
+ * on the low power mode being entered. L2 low power mode is also set in
+ * this function.
+
+ * @limits: pointer to the resource limits of the low power mode being entered.
+ * @from_idle: bool to determine if this call being made as a part of
+ * idle power collapse.
+ * @notify_rpm: bool that informs if this is an RPM notified power collapse.
+ *
+ * returns 0 on success.
+ */
+int msm_lpmrs_enter_sleep(struct msm_rpmrs_limits *limits,
+ bool from_idle, bool notify_rpm);
+
+/**
+ * msm_lpmrs_exit_sleep() - Exit sleep, reset the MPM and L2 mode.
+ * @ sclk_count - Sleep Clock count.
+ * @ limits: pointer to resource limits of the most recent low power mode.
+ * @from_idle: bool to determine if this call being made as a part of
+ * idle power collapse.
+ * @notify_rpm: bool that informs if this is an RPM notified power collapse.
+ */
+void msm_lpmrs_exit_sleep(uint32_t sclk_count, struct msm_rpmrs_limits *limits,
+ bool from_idle, bool notify_rpm);
+/**
+ * msm_lpmrs_module_init() - Init function that parses the device tree to
+ * get the low power resource attributes and registers with RPM driver for
+ * callback notification.
+ *
+ * returns 0 on success.
+ */
+int __init msm_lpmrs_module_init(void);
+
+#else
+static inline bool msm_lpm_level_beyond_limit(struct msm_rpmrs_limits *limits)
+{
+ return true;
+}
+
+static inline int msm_lpmrs_enter_sleep(struct msm_rpmrs_limits *limits,
+ bool from_idle, bool notify_rpm)
+{
+ return 0;
+}
+
+static inline void msm_lpmrs_exit_sleep(uint32_t sclk_count,
+ struct msm_rpmrs_limits *limits, bool from_idle,
+ bool notify_rpm)
+{
+ return;
+}
+
+static inline int __init msm_lpmrs_module_init(void)
+{
+ return 0;
+}
+#endif /* CONFIG_MSM_RPM_SMD */
+
+#endif