| /* |
| * 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/power/smartreflex.h> |
| |
| #include <linux/err.h> |
| #include <linux/slab.h> |
| #include <linux/io.h> |
| |
| #include "soc.h" |
| #include "omap_device.h" |
| #include "voltage.h" |
| #include "control.h" |
| #include "pm.h" |
| |
| static bool sr_enable_on_init; |
| |
| /* 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, j, count = 0; |
| |
| sr_data->nvalue_count = 0; |
| sr_data->nvalue_table = NULL; |
| |
| while (volt_data[count].volt_nominal) |
| count++; |
| |
| nvalue_table = kzalloc(sizeof(struct omap_sr_nvalue_table)*count, |
| GFP_KERNEL); |
| |
| if (!nvalue_table) { |
| pr_err("OMAP: SmartReflex: cannot allocate memory for n-value table\n"); |
| return; |
| } |
| |
| for (i = 0, j = 0; i < count; i++) { |
| u32 v; |
| |
| /* |
| * In OMAP4 the efuse registers are 24 bit aligned. |
| * A readl_relaxed 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); |
| } |
| |
| /* |
| * Many OMAP SoCs don't have the eFuse values set. |
| * For example, pretty much all OMAP3xxx before |
| * ES3.something. |
| * |
| * XXX There needs to be some way for board files or |
| * userspace to add these in. |
| */ |
| if (v == 0) |
| continue; |
| |
| nvalue_table[j].nvalue = v; |
| nvalue_table[j].efuse_offs = volt_data[i].sr_efuse_offs; |
| nvalue_table[j].errminlimit = volt_data[i].sr_errminlimit; |
| nvalue_table[j].volt_nominal = volt_data[i].volt_nominal; |
| |
| j++; |
| } |
| |
| sr_data->nvalue_table = nvalue_table; |
| sr_data->nvalue_count = j; |
| } |
| |
| static int __init sr_dev_init(struct omap_hwmod *oh, void *user) |
| { |
| struct omap_sr_data *sr_data; |
| struct platform_device *pdev; |
| struct omap_volt_data *volt_data; |
| struct omap_smartreflex_dev_attr *sr_dev_attr; |
| 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\n", |
| __func__, oh->name); |
| return -ENOMEM; |
| } |
| |
| sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr; |
| if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) { |
| pr_err("%s: No voltage domain specified for %s. Cannot initialize\n", |
| __func__, oh->name); |
| goto exit; |
| } |
| |
| sr_data->name = oh->name; |
| sr_data->ip_type = oh->class->rev; |
| sr_data->senn_mod = 0x1; |
| sr_data->senp_mod = 0x1; |
| |
| if (cpu_is_omap34xx() || cpu_is_omap44xx()) { |
| sr_data->err_weight = OMAP3430_SR_ERRWEIGHT; |
| sr_data->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT; |
| sr_data->accum_data = OMAP3430_SR_ACCUMDATA; |
| if (!(strcmp(sr_data->name, "smartreflex_mpu"))) { |
| sr_data->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT; |
| sr_data->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT; |
| } else { |
| sr_data->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT; |
| sr_data->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT; |
| } |
| } |
| |
| sr_data->voltdm = voltdm_lookup(sr_dev_attr->sensor_voltdm_name); |
| if (!sr_data->voltdm) { |
| pr_err("%s: Unable to get voltage domain pointer for VDD %s\n", |
| __func__, sr_dev_attr->sensor_voltdm_name); |
| goto exit; |
| } |
| |
| omap_voltage_get_volttable(sr_data->voltdm, &volt_data); |
| if (!volt_data) { |
| pr_err("%s: No Voltage table registered for VDD%d\n", |
| __func__, i + 1); |
| goto exit; |
| } |
| |
| sr_set_nvalues(volt_data, sr_data); |
| |
| sr_data->enable_on_init = sr_enable_on_init; |
| |
| pdev = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data)); |
| if (IS_ERR(pdev)) |
| 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); |
| } |