Adds init/change_level/validate_level calls for latency
resources on OMAP3
Signed-off-by: Rajendra Nayak <[EMAIL PROTECTED]>
---
arch/arm/mach-omap2/resource34xx.c | 126 +++++++++++++++++++++++++++++++++++++
1 files changed, 126 insertions(+)
Index: linux-omap-2.6/arch/arm/mach-omap2/resource34xx.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-omap-2.6/arch/arm/mach-omap2/resource34xx.c 2008-10-16
18:07:14.000000000 +0530
@@ -0,0 +1,126 @@
+/*
+ * linux/arch/arm/mach-omap2/resource34xx.c
+ * OMAP3 resource init/change_level/validate_level functions
+ *
+ * Copyright (C) 2007-2008 Texas Instruments, Inc.
+ * Rajendra Nayak <[EMAIL PROTECTED]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * History:
+ *
+ */
+
+#include <linux/pm_qos_params.h>
+#include <mach/powerdomain.h>
+#include <mach/clockdomain.h>
+#include "resource34xx.h"
+
+int set_pwrdm_state(struct powerdomain *pwrdm, u32 state);
+
+/**
+ * init_latency - Initializes the mpu/core latency resource.
+ * @resp: Latency resource to be initalized
+ *
+ * No return value.
+ */
+void init_latency(struct shared_resource *resp)
+{
+ resp->no_of_users = 0;
+ resp->curr_level = RES_DEFAULTLEVEL;
+ *((u8 *)resp->resource_data) = 0;
+ return;
+}
+
+/**
+ * set_latency - Adds/Updates and removes the CPU_DMA_LATENCY in
*pm_qos_params.
+ * @resp: resource pointer
+ * @latency: target latency to be set
+ *
+ * Returns 0 on success, or error values as returned by
+ * pm_qos_update_requirement/pm_qos_add_requirement.
+ */
+int set_latency(struct shared_resource *resp, u32 latency)
+{
+ u8 *pm_qos_req_added;
+
+ if (resp->curr_level == latency)
+ return 0;
+ else
+ /* Update the resources current level */
+ resp->curr_level = latency;
+
+ pm_qos_req_added = resp->resource_data;
+ if (latency == RES_DEFAULTLEVEL)
+ /* No more users left, remove the pm_qos_req if present */
+ if (*pm_qos_req_added) {
+ pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
+ resp->name);
+ *pm_qos_req_added = 0;
+ return 0;
+ }
+
+ if (*pm_qos_req_added) {
+ return pm_qos_update_requirement(PM_QOS_CPU_DMA_LATENCY,
+ resp->name, latency);
+ } else {
+ *pm_qos_req_added = 1;
+ return pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
+ resp->name, latency);
+ }
+}
+
+/**
+ * init_pd_latency - Initializes the power domain latency resource.
+ * @resp: Power Domain Latency resource to be initialized.
+ *
+ * No return value.
+ */
+void init_pd_latency(struct shared_resource *resp)
+{
+ struct pd_latency_db *pd_lat_db;
+
+ resp->no_of_users = 0;
+ resp->curr_level = PD_LATENCY_OFF;
+ pd_lat_db = resp->resource_data;
+ /* Populate the power domain associated with the latency resource */
+ pd_lat_db->pd = pwrdm_lookup(pd_lat_db->pwrdm_name);
+ return;
+}
+
+/**
+ * set_pd_latency - Updates the curr_level of the power domain resource.
+ * @resp: Power domain latency resource.
+ * @latency: New latency value acceptable.
+ *
+ * This function maps the latency in microsecs to the acceptable
+ * Power domain state using the latency DB.
+ * It then programs the power domain to enter the target state.
+ * Always returns 0.
+ */
+int set_pd_latency(struct shared_resource *resp, u32 latency)
+{
+ u32 pd_lat_level, ind;
+ struct pd_latency_db *pd_lat_db;
+ struct powerdomain *pwrdm;
+
+ pd_lat_db = resp->resource_data;
+ pwrdm = pd_lat_db->pd;
+ pd_lat_level = PD_LATENCY_OFF;
+ /* using the latency db map to the appropriate PD state */
+ for (ind = 0; ind < PD_LATENCY_MAXLEVEL; ind++) {
+ if (pd_lat_db->latency[ind] < latency) {
+ pd_lat_level = ind;
+ break;
+ }
+ }
+
+ resp->curr_level = pd_lat_level;
+ set_pwrdm_state(pwrdm, pd_lat_level);
+ return 0;
+}
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