diff options
Diffstat (limited to 'arch/arm/mach-omap2/sr_device.c')
| -rw-r--r-- | arch/arm/mach-omap2/sr_device.c | 177 |
1 files changed, 177 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 000000000..d7cff2632 --- /dev/null +++ b/arch/arm/mach-omap2/sr_device.c @@ -0,0 +1,177 @@ +/* + * 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_warn("%s: Could not build omap_device for %s: %s\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); +} |