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216 lines
5.1 KiB
216 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* OMAP3/OMAP4 smartreflex device file |
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* |
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* Author: Thara Gopinath <[email protected]> |
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* |
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* Based originally on code from smartreflex.c |
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* Copyright (C) 2010 Texas Instruments, Inc. |
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* Thara Gopinath <[email protected]> |
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* |
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* Copyright (C) 2008 Nokia Corporation |
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* Kalle Jokiniemi |
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* |
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* Copyright (C) 2007 Texas Instruments, Inc. |
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* Lesly A M <[email protected]> |
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*/ |
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#include <linux/power/smartreflex.h> |
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#include <linux/err.h> |
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#include <linux/slab.h> |
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#include <linux/io.h> |
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#include "soc.h" |
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#include "omap_device.h" |
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#include "voltage.h" |
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#include "control.h" |
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#include "pm.h" |
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static bool sr_enable_on_init; |
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/* Read EFUSE values from control registers for OMAP3430 */ |
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static void __init sr_set_nvalues(struct omap_volt_data *volt_data, |
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struct omap_sr_data *sr_data) |
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{ |
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struct omap_sr_nvalue_table *nvalue_table; |
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int i, j, count = 0; |
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sr_data->nvalue_count = 0; |
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sr_data->nvalue_table = NULL; |
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while (volt_data[count].volt_nominal) |
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count++; |
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nvalue_table = kcalloc(count, sizeof(*nvalue_table), GFP_KERNEL); |
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if (!nvalue_table) |
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return; |
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for (i = 0, j = 0; i < count; i++) { |
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u32 v; |
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/* |
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* In OMAP4 the efuse registers are 24 bit aligned. |
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* A readl_relaxed will fail for non-32 bit aligned address |
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* and hence the 8-bit read and shift. |
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*/ |
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if (cpu_is_omap44xx()) { |
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u16 offset = volt_data[i].sr_efuse_offs; |
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v = omap_ctrl_readb(offset) | |
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omap_ctrl_readb(offset + 1) << 8 | |
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omap_ctrl_readb(offset + 2) << 16; |
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} else { |
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v = omap_ctrl_readl(volt_data[i].sr_efuse_offs); |
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} |
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/* |
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* Many OMAP SoCs don't have the eFuse values set. |
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* For example, pretty much all OMAP3xxx before |
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* ES3.something. |
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* |
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* XXX There needs to be some way for board files or |
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* userspace to add these in. |
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*/ |
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if (v == 0) |
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continue; |
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nvalue_table[j].nvalue = v; |
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nvalue_table[j].efuse_offs = volt_data[i].sr_efuse_offs; |
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nvalue_table[j].errminlimit = volt_data[i].sr_errminlimit; |
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nvalue_table[j].volt_nominal = volt_data[i].volt_nominal; |
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j++; |
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} |
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sr_data->nvalue_table = nvalue_table; |
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sr_data->nvalue_count = j; |
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} |
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extern struct omap_sr_data omap_sr_pdata[]; |
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static int __init sr_init_by_name(const char *name, const char *voltdm) |
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{ |
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struct omap_sr_data *sr_data = NULL; |
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struct omap_volt_data *volt_data; |
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static int i; |
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if (!strncmp(name, "smartreflex_mpu_iva", 20) || |
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!strncmp(name, "smartreflex_mpu", 16)) |
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sr_data = &omap_sr_pdata[OMAP_SR_MPU]; |
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else if (!strncmp(name, "smartreflex_core", 17)) |
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sr_data = &omap_sr_pdata[OMAP_SR_CORE]; |
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else if (!strncmp(name, "smartreflex_iva", 16)) |
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sr_data = &omap_sr_pdata[OMAP_SR_IVA]; |
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if (!sr_data) { |
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pr_err("%s: Unknown instance %s\n", __func__, name); |
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return -EINVAL; |
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} |
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sr_data->name = name; |
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if (cpu_is_omap343x()) |
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sr_data->ip_type = 1; |
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else |
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sr_data->ip_type = 2; |
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sr_data->senn_mod = 0x1; |
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sr_data->senp_mod = 0x1; |
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if (cpu_is_omap34xx() || cpu_is_omap44xx()) { |
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sr_data->err_weight = OMAP3430_SR_ERRWEIGHT; |
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sr_data->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT; |
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sr_data->accum_data = OMAP3430_SR_ACCUMDATA; |
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if (!(strcmp(sr_data->name, "smartreflex_mpu"))) { |
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sr_data->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT; |
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sr_data->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT; |
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} else { |
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sr_data->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT; |
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sr_data->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT; |
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} |
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} |
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sr_data->voltdm = voltdm_lookup(voltdm); |
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if (!sr_data->voltdm) { |
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pr_err("%s: Unable to get voltage domain pointer for VDD %s\n", |
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__func__, voltdm); |
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goto exit; |
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} |
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omap_voltage_get_volttable(sr_data->voltdm, &volt_data); |
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if (!volt_data) { |
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pr_err("%s: No Voltage table registered for VDD%d\n", |
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__func__, i + 1); |
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goto exit; |
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} |
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sr_set_nvalues(volt_data, sr_data); |
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sr_data->enable_on_init = sr_enable_on_init; |
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exit: |
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i++; |
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return 0; |
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} |
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static int __init sr_dev_init(struct omap_hwmod *oh, void *user) |
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{ |
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struct omap_smartreflex_dev_attr *sr_dev_attr; |
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sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr; |
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if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) { |
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pr_err("%s: No voltage domain specified for %s. Cannot initialize\n", |
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__func__, oh->name); |
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return 0; |
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} |
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return sr_init_by_name(oh->name, sr_dev_attr->sensor_voltdm_name); |
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} |
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/* |
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* API to be called from board files to enable smartreflex |
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* autocompensation at init. |
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*/ |
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void __init omap_enable_smartreflex_on_init(void) |
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{ |
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sr_enable_on_init = true; |
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} |
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static const char * const omap4_sr_instances[] = { |
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"mpu", |
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"iva", |
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"core", |
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}; |
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static const char * const dra7_sr_instances[] = { |
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"mpu", |
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"core", |
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}; |
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int __init omap_devinit_smartreflex(void) |
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{ |
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const char * const *sr_inst = NULL; |
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int i, nr_sr = 0; |
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if (soc_is_omap44xx()) { |
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sr_inst = omap4_sr_instances; |
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nr_sr = ARRAY_SIZE(omap4_sr_instances); |
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} else if (soc_is_dra7xx()) { |
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sr_inst = dra7_sr_instances; |
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nr_sr = ARRAY_SIZE(dra7_sr_instances); |
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} |
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if (nr_sr) { |
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const char *name, *voltdm; |
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for (i = 0; i < nr_sr; i++) { |
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name = kasprintf(GFP_KERNEL, "smartreflex_%s", sr_inst[i]); |
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voltdm = sr_inst[i]; |
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sr_init_by_name(name, voltdm); |
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} |
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return 0; |
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} |
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return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL); |
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}
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