OMAP3: PM: Adding smartreflex device file.

This patch adds support for device registration of various
smartreflex module present in the system. This patch introduces
the platform data for smartreflex devices which include
the efused n-target vaules, a parameter to indicate
whether smartreflex autocompensation needs to be
enabled on init or not. An API
omap_enable_smartreflex_on_init is provided for the
board files to enable smartreflex autocompensation during
system boot up.

Signed-off-by: Thara Gopinath <thara@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 131 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/sr_device.c b/arch/arm/mach-omap2/sr_device.c
new file mode 100644
index 000000000000..9a3538fb633a
--- /dev/null
+++ b/arch/arm/mach-omap2/sr_device.c
@@ -0,0 +1,131 @@
+/*
+ * OMAP3/OMAP4 smartreflex device file
+ *
+ * Author: Thara Gopinath       <thara@ti.com>
+ *
+ * Based originally on code from smartreflex.c
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ * Thara Gopinath <thara@ti.com>
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ * Kalle Jokiniemi
+ *
+ * Copyright (C) 2007 Texas Instruments, Inc.
+ * Lesly A M <x0080970@ti.com>
+ *
+ * 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.
+ */
+
+#include <linux/err.h>
+#include <linux/slab.h>
+
+#include <plat/omap_device.h>
+#include <plat/smartreflex.h>
+#include <plat/voltage.h>
+
+#include "control.h"
+
+static bool sr_enable_on_init;
+
+static struct omap_device_pm_latency omap_sr_latency[] = {
+        {
+                .deactivate_func = omap_device_idle_hwmods,
+                .activate_func   = omap_device_enable_hwmods,
+                .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST
+        },
+};
+
+/* Read EFUSE values from control registers for OMAP3430 */
+static void __init sr_set_nvalues(struct omap_volt_data *volt_data,
+                                struct omap_sr_data *sr_data)
+{
+        struct omap_sr_nvalue_table *nvalue_table;
+        int i, count = 0;
+
+        while (volt_data[count].volt_nominal)
+                count++;
+
+        nvalue_table = kzalloc(sizeof(struct omap_sr_nvalue_table)*count,
+                        GFP_KERNEL);
+
+        for (i = 0; i < count; i++) {
+                u32 v = omap_ctrl_readl(volt_data[i].sr_efuse_offs);
+
+                nvalue_table[i].efuse_offs = volt_data[i].sr_efuse_offs;
+                nvalue_table[i].nvalue = v;
+        }
+
+        sr_data->nvalue_table = nvalue_table;
+        sr_data->nvalue_count = count;
+}
+
+static int sr_dev_init(struct omap_hwmod *oh, void *user)
+{
+        struct omap_sr_data *sr_data;
+        struct omap_device *od;
+        struct omap_volt_data *volt_data;
+        char *name = "smartreflex";
+        static int i;
+
+        sr_data = kzalloc(sizeof(struct omap_sr_data), GFP_KERNEL);
+        if (!sr_data) {
+                pr_err("%s: Unable to allocate memory for %s sr_data.Error!\n",
+                        __func__, oh->name);
+                return -ENOMEM;
+        }
+
+        if (!oh->vdd_name) {
+                pr_err("%s: No voltage domain specified for %s."
+                        "Cannot initialize\n", __func__, oh->name);
+                goto exit;
+        }
+
+        sr_data->ip_type = oh->class->rev;
+        sr_data->senn_mod = 0x1;
+        sr_data->senp_mod = 0x1;
+
+        sr_data->voltdm = omap_voltage_domain_lookup(oh->vdd_name);
+        if (IS_ERR(sr_data->voltdm)) {
+                pr_err("%s: Unable to get voltage domain pointer for VDD %s\n",
+                        __func__, oh->vdd_name);
+                goto exit;
+        }
+
+        omap_voltage_get_volttable(sr_data->voltdm, &volt_data);
+        if (!volt_data) {
+                pr_warning("%s: No Voltage table registerd fo VDD%d."
+                        "Something really wrong\n\n", __func__, i + 1);
+                goto exit;
+        }
+
+        sr_set_nvalues(volt_data, sr_data);
+
+        sr_data->enable_on_init = sr_enable_on_init;
+
+        od = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data),
+                               omap_sr_latency,
+                               ARRAY_SIZE(omap_sr_latency), 0);
+        if (IS_ERR(od))
+                pr_warning("%s: Could not build omap_device for %s: %s.\n\n",
+                        __func__, name, oh->name);
+exit:
+        i++;
+        kfree(sr_data);
+        return 0;
+}
+
+/*
+ * API to be called from board files to enable smartreflex
+ * autocompensation at init.
+ */
+void __init omap_enable_smartreflex_on_init(void)
+{
+        sr_enable_on_init = true;
+}
+
+int __init omap_devinit_smartreflex(void)
+{
+        return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);
+}