Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / arch / arm / mach-omap2 / sr_device.c

diff --git a/arch/arm/mach-omap2/sr_device.c b/arch/arm/mach-omap2/sr_device.c
new file mode 100644 (file)
index 0000000..b1e0af1
--- /dev/null
+++ b/arch/arm/mach-omap2/sr_device.c
@@ -0,0 +1,147 @@
+/*
+ * 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 <linux/io.h>
+
+#include <plat/omap_device.h>
+#include <plat/smartreflex.h>
+#include <plat/voltage.h>
+
+#include "control.h"
+#include "pm.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;
+               /*
+                * In OMAP4 the efuse registers are 24 bit aligned.
+                * A __raw_readl will fail for non-32 bit aligned address
+                * and hence the 8-bit read and shift.
+                */
+               if (cpu_is_omap44xx()) {
+                       u16 offset = volt_data[i].sr_efuse_offs;
+
+                       v = omap_ctrl_readb(offset) |
+                               omap_ctrl_readb(offset + 1) << 8 |
+                               omap_ctrl_readb(offset + 2) << 16;
+               } else {
+                        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);
+}