| /* |
| * OMAP3/OMAP4 Voltage Management Routines |
| * |
| * Author: Thara Gopinath <thara@ti.com> |
| * |
| * Copyright (C) 2007 Texas Instruments, Inc. |
| * Rajendra Nayak <rnayak@ti.com> |
| * Lesly A M <x0080970@ti.com> |
| * |
| * Copyright (C) 2008, 2011 Nokia Corporation |
| * Kalle Jokiniemi |
| * Paul Walmsley |
| * |
| * Copyright (C) 2010 Texas Instruments, Inc. |
| * Thara Gopinath <thara@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/delay.h> |
| #include <linux/io.h> |
| #include <linux/clk.h> |
| #include <linux/err.h> |
| #include <linux/debugfs.h> |
| #include <linux/slab.h> |
| |
| #include <plat/common.h> |
| |
| #include "prm-regbits-34xx.h" |
| #include "prm-regbits-44xx.h" |
| #include "prm44xx.h" |
| #include "prcm44xx.h" |
| #include "prminst44xx.h" |
| #include "control.h" |
| |
| #include "voltage.h" |
| |
| #include "vc.h" |
| #include "vp.h" |
| |
| #define VOLTAGE_DIR_SIZE 16 |
| |
| |
| static struct omap_vdd_info **vdd_info; |
| |
| /* |
| * Number of scalable voltage domains. |
| */ |
| static int nr_scalable_vdd; |
| |
| /* XXX document */ |
| static s16 prm_mod_offs; |
| static s16 prm_irqst_ocp_mod_offs; |
| |
| static struct dentry *voltage_dir; |
| |
| /* Init function pointers */ |
| static int vp_forceupdate_scale_voltage(struct omap_vdd_info *vdd, |
| unsigned long target_volt); |
| |
| static u32 omap3_voltage_read_reg(u16 mod, u8 offset) |
| { |
| return omap2_prm_read_mod_reg(mod, offset); |
| } |
| |
| static void omap3_voltage_write_reg(u32 val, u16 mod, u8 offset) |
| { |
| omap2_prm_write_mod_reg(val, mod, offset); |
| } |
| |
| static u32 omap4_voltage_read_reg(u16 mod, u8 offset) |
| { |
| return omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, |
| mod, offset); |
| } |
| |
| static void omap4_voltage_write_reg(u32 val, u16 mod, u8 offset) |
| { |
| omap4_prminst_write_inst_reg(val, OMAP4430_PRM_PARTITION, mod, offset); |
| } |
| |
| static int __init _config_common_vdd_data(struct omap_vdd_info *vdd) |
| { |
| char *sys_ck_name; |
| struct clk *sys_ck; |
| u32 sys_clk_speed, timeout_val, waittime; |
| |
| /* |
| * XXX Clockfw should handle this, or this should be in a |
| * struct record |
| */ |
| if (cpu_is_omap24xx() || cpu_is_omap34xx()) |
| sys_ck_name = "sys_ck"; |
| else if (cpu_is_omap44xx()) |
| sys_ck_name = "sys_clkin_ck"; |
| else |
| return -EINVAL; |
| |
| /* |
| * Sys clk rate is require to calculate vp timeout value and |
| * smpswaittimemin and smpswaittimemax. |
| */ |
| sys_ck = clk_get(NULL, sys_ck_name); |
| if (IS_ERR(sys_ck)) { |
| pr_warning("%s: Could not get the sys clk to calculate" |
| "various vdd_%s params\n", __func__, vdd->voltdm.name); |
| return -EINVAL; |
| } |
| sys_clk_speed = clk_get_rate(sys_ck); |
| clk_put(sys_ck); |
| /* Divide to avoid overflow */ |
| sys_clk_speed /= 1000; |
| |
| /* Generic voltage parameters */ |
| vdd->curr_volt = 1200000; |
| vdd->volt_scale = vp_forceupdate_scale_voltage; |
| vdd->vp_enabled = false; |
| |
| vdd->vp_rt_data.vpconfig_erroroffset = |
| (vdd->pmic_info->vp_erroroffset << |
| vdd->vp_data->vp_common->vpconfig_erroroffset_shift); |
| |
| timeout_val = (sys_clk_speed * vdd->pmic_info->vp_timeout_us) / 1000; |
| vdd->vp_rt_data.vlimitto_timeout = timeout_val; |
| vdd->vp_rt_data.vlimitto_vddmin = vdd->pmic_info->vp_vddmin; |
| vdd->vp_rt_data.vlimitto_vddmax = vdd->pmic_info->vp_vddmax; |
| |
| waittime = ((vdd->pmic_info->step_size / vdd->pmic_info->slew_rate) * |
| sys_clk_speed) / 1000; |
| vdd->vp_rt_data.vstepmin_smpswaittimemin = waittime; |
| vdd->vp_rt_data.vstepmax_smpswaittimemax = waittime; |
| vdd->vp_rt_data.vstepmin_stepmin = vdd->pmic_info->vp_vstepmin; |
| vdd->vp_rt_data.vstepmax_stepmax = vdd->pmic_info->vp_vstepmax; |
| |
| return 0; |
| } |
| |
| /* Voltage debugfs support */ |
| static int vp_volt_debug_get(void *data, u64 *val) |
| { |
| struct omap_vdd_info *vdd = (struct omap_vdd_info *) data; |
| u8 vsel; |
| |
| if (!vdd) { |
| pr_warning("Wrong paramater passed\n"); |
| return -EINVAL; |
| } |
| |
| vsel = vdd->read_reg(prm_mod_offs, vdd->vp_data->voltage); |
| pr_notice("curr_vsel = %x\n", vsel); |
| |
| if (!vdd->pmic_info->vsel_to_uv) { |
| pr_warning("PMIC function to convert vsel to voltage" |
| "in uV not registerd\n"); |
| return -EINVAL; |
| } |
| |
| *val = vdd->pmic_info->vsel_to_uv(vsel); |
| return 0; |
| } |
| |
| static int nom_volt_debug_get(void *data, u64 *val) |
| { |
| struct omap_vdd_info *vdd = (struct omap_vdd_info *) data; |
| |
| if (!vdd) { |
| pr_warning("Wrong paramater passed\n"); |
| return -EINVAL; |
| } |
| |
| *val = omap_voltage_get_nom_volt(&vdd->voltdm); |
| |
| return 0; |
| } |
| |
| DEFINE_SIMPLE_ATTRIBUTE(vp_volt_debug_fops, vp_volt_debug_get, NULL, "%llu\n"); |
| DEFINE_SIMPLE_ATTRIBUTE(nom_volt_debug_fops, nom_volt_debug_get, NULL, |
| "%llu\n"); |
| static void vp_latch_vsel(struct omap_vdd_info *vdd) |
| { |
| u32 vpconfig; |
| unsigned long uvdc; |
| char vsel; |
| |
| uvdc = omap_voltage_get_nom_volt(&vdd->voltdm); |
| if (!uvdc) { |
| pr_warning("%s: unable to find current voltage for vdd_%s\n", |
| __func__, vdd->voltdm.name); |
| return; |
| } |
| |
| if (!vdd->pmic_info || !vdd->pmic_info->uv_to_vsel) { |
| pr_warning("%s: PMIC function to convert voltage in uV to" |
| " vsel not registered\n", __func__); |
| return; |
| } |
| |
| vsel = vdd->pmic_info->uv_to_vsel(uvdc); |
| |
| vpconfig = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig); |
| vpconfig &= ~(vdd->vp_data->vp_common->vpconfig_initvoltage_mask | |
| vdd->vp_data->vp_common->vpconfig_initvdd); |
| vpconfig |= vsel << vdd->vp_data->vp_common->vpconfig_initvoltage_shift; |
| |
| vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); |
| |
| /* Trigger initVDD value copy to voltage processor */ |
| vdd->write_reg((vpconfig | vdd->vp_data->vp_common->vpconfig_initvdd), |
| prm_mod_offs, vdd->vp_data->vpconfig); |
| |
| /* Clear initVDD copy trigger bit */ |
| vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); |
| } |
| |
| /* Generic voltage init functions */ |
| static void __init vp_init(struct omap_vdd_info *vdd) |
| { |
| u32 vp_val; |
| |
| if (!vdd->read_reg || !vdd->write_reg) { |
| pr_err("%s: No read/write API for accessing vdd_%s regs\n", |
| __func__, vdd->voltdm.name); |
| return; |
| } |
| |
| vp_val = vdd->vp_rt_data.vpconfig_erroroffset | |
| (vdd->vp_rt_data.vpconfig_errorgain << |
| vdd->vp_data->vp_common->vpconfig_errorgain_shift) | |
| vdd->vp_data->vp_common->vpconfig_timeouten; |
| vdd->write_reg(vp_val, prm_mod_offs, vdd->vp_data->vpconfig); |
| |
| vp_val = ((vdd->vp_rt_data.vstepmin_smpswaittimemin << |
| vdd->vp_data->vp_common->vstepmin_smpswaittimemin_shift) | |
| (vdd->vp_rt_data.vstepmin_stepmin << |
| vdd->vp_data->vp_common->vstepmin_stepmin_shift)); |
| vdd->write_reg(vp_val, prm_mod_offs, vdd->vp_data->vstepmin); |
| |
| vp_val = ((vdd->vp_rt_data.vstepmax_smpswaittimemax << |
| vdd->vp_data->vp_common->vstepmax_smpswaittimemax_shift) | |
| (vdd->vp_rt_data.vstepmax_stepmax << |
| vdd->vp_data->vp_common->vstepmax_stepmax_shift)); |
| vdd->write_reg(vp_val, prm_mod_offs, vdd->vp_data->vstepmax); |
| |
| vp_val = ((vdd->vp_rt_data.vlimitto_vddmax << |
| vdd->vp_data->vp_common->vlimitto_vddmax_shift) | |
| (vdd->vp_rt_data.vlimitto_vddmin << |
| vdd->vp_data->vp_common->vlimitto_vddmin_shift) | |
| (vdd->vp_rt_data.vlimitto_timeout << |
| vdd->vp_data->vp_common->vlimitto_timeout_shift)); |
| vdd->write_reg(vp_val, prm_mod_offs, vdd->vp_data->vlimitto); |
| } |
| |
| static void __init vdd_debugfs_init(struct omap_vdd_info *vdd) |
| { |
| char *name; |
| |
| name = kzalloc(VOLTAGE_DIR_SIZE, GFP_KERNEL); |
| if (!name) { |
| pr_warning("%s: Unable to allocate memory for debugfs" |
| " directory name for vdd_%s", |
| __func__, vdd->voltdm.name); |
| return; |
| } |
| strcpy(name, "vdd_"); |
| strcat(name, vdd->voltdm.name); |
| |
| vdd->debug_dir = debugfs_create_dir(name, voltage_dir); |
| kfree(name); |
| if (IS_ERR(vdd->debug_dir)) { |
| pr_warning("%s: Unable to create debugfs directory for" |
| " vdd_%s\n", __func__, vdd->voltdm.name); |
| vdd->debug_dir = NULL; |
| return; |
| } |
| |
| (void) debugfs_create_x16("vp_errorgain", S_IRUGO, vdd->debug_dir, |
| &(vdd->vp_rt_data.vpconfig_errorgain)); |
| (void) debugfs_create_x16("vp_smpswaittimemin", S_IRUGO, |
| vdd->debug_dir, |
| &(vdd->vp_rt_data.vstepmin_smpswaittimemin)); |
| (void) debugfs_create_x8("vp_stepmin", S_IRUGO, vdd->debug_dir, |
| &(vdd->vp_rt_data.vstepmin_stepmin)); |
| (void) debugfs_create_x16("vp_smpswaittimemax", S_IRUGO, |
| vdd->debug_dir, |
| &(vdd->vp_rt_data.vstepmax_smpswaittimemax)); |
| (void) debugfs_create_x8("vp_stepmax", S_IRUGO, vdd->debug_dir, |
| &(vdd->vp_rt_data.vstepmax_stepmax)); |
| (void) debugfs_create_x8("vp_vddmax", S_IRUGO, vdd->debug_dir, |
| &(vdd->vp_rt_data.vlimitto_vddmax)); |
| (void) debugfs_create_x8("vp_vddmin", S_IRUGO, vdd->debug_dir, |
| &(vdd->vp_rt_data.vlimitto_vddmin)); |
| (void) debugfs_create_x16("vp_timeout", S_IRUGO, vdd->debug_dir, |
| &(vdd->vp_rt_data.vlimitto_timeout)); |
| (void) debugfs_create_file("curr_vp_volt", S_IRUGO, vdd->debug_dir, |
| (void *) vdd, &vp_volt_debug_fops); |
| (void) debugfs_create_file("curr_nominal_volt", S_IRUGO, |
| vdd->debug_dir, (void *) vdd, |
| &nom_volt_debug_fops); |
| } |
| |
| /* Voltage scale and accessory APIs */ |
| static int _pre_volt_scale(struct omap_vdd_info *vdd, |
| unsigned long target_volt, u8 *target_vsel, u8 *current_vsel) |
| { |
| struct omap_volt_data *volt_data; |
| const struct omap_vc_common_data *vc_common; |
| const struct omap_vp_common_data *vp_common; |
| u32 vc_cmdval, vp_errgain_val; |
| |
| vc_common = vdd->vc_data->vc_common; |
| vp_common = vdd->vp_data->vp_common; |
| |
| /* Check if suffiecient pmic info is available for this vdd */ |
| if (!vdd->pmic_info) { |
| pr_err("%s: Insufficient pmic info to scale the vdd_%s\n", |
| __func__, vdd->voltdm.name); |
| return -EINVAL; |
| } |
| |
| if (!vdd->pmic_info->uv_to_vsel) { |
| pr_err("%s: PMIC function to convert voltage in uV to" |
| "vsel not registered. Hence unable to scale voltage" |
| "for vdd_%s\n", __func__, vdd->voltdm.name); |
| return -ENODATA; |
| } |
| |
| if (!vdd->read_reg || !vdd->write_reg) { |
| pr_err("%s: No read/write API for accessing vdd_%s regs\n", |
| __func__, vdd->voltdm.name); |
| return -EINVAL; |
| } |
| |
| /* Get volt_data corresponding to target_volt */ |
| volt_data = omap_voltage_get_voltdata(&vdd->voltdm, target_volt); |
| if (IS_ERR(volt_data)) |
| volt_data = NULL; |
| |
| *target_vsel = vdd->pmic_info->uv_to_vsel(target_volt); |
| *current_vsel = vdd->read_reg(prm_mod_offs, vdd->vp_data->voltage); |
| |
| /* Setting the ON voltage to the new target voltage */ |
| vc_cmdval = vdd->read_reg(prm_mod_offs, vdd->vc_data->cmdval_reg); |
| vc_cmdval &= ~vc_common->cmd_on_mask; |
| vc_cmdval |= (*target_vsel << vc_common->cmd_on_shift); |
| vdd->write_reg(vc_cmdval, prm_mod_offs, vdd->vc_data->cmdval_reg); |
| |
| /* Setting vp errorgain based on the voltage */ |
| if (volt_data) { |
| vp_errgain_val = vdd->read_reg(prm_mod_offs, |
| vdd->vp_data->vpconfig); |
| vdd->vp_rt_data.vpconfig_errorgain = volt_data->vp_errgain; |
| vp_errgain_val &= ~vp_common->vpconfig_errorgain_mask; |
| vp_errgain_val |= vdd->vp_rt_data.vpconfig_errorgain << |
| vp_common->vpconfig_errorgain_shift; |
| vdd->write_reg(vp_errgain_val, prm_mod_offs, |
| vdd->vp_data->vpconfig); |
| } |
| |
| return 0; |
| } |
| |
| static void _post_volt_scale(struct omap_vdd_info *vdd, |
| unsigned long target_volt, u8 target_vsel, u8 current_vsel) |
| { |
| u32 smps_steps = 0, smps_delay = 0; |
| |
| smps_steps = abs(target_vsel - current_vsel); |
| /* SMPS slew rate / step size. 2us added as buffer. */ |
| smps_delay = ((smps_steps * vdd->pmic_info->step_size) / |
| vdd->pmic_info->slew_rate) + 2; |
| udelay(smps_delay); |
| |
| vdd->curr_volt = target_volt; |
| } |
| |
| /* vc_bypass_scale_voltage - VC bypass method of voltage scaling */ |
| static int vc_bypass_scale_voltage(struct omap_vdd_info *vdd, |
| unsigned long target_volt) |
| { |
| u32 loop_cnt = 0, retries_cnt = 0; |
| u32 vc_valid, vc_bypass_val_reg, vc_bypass_value; |
| u8 target_vsel, current_vsel; |
| int ret; |
| |
| ret = _pre_volt_scale(vdd, target_volt, &target_vsel, ¤t_vsel); |
| if (ret) |
| return ret; |
| |
| vc_valid = vdd->vc_data->vc_common->valid; |
| vc_bypass_val_reg = vdd->vc_data->vc_common->bypass_val_reg; |
| vc_bypass_value = (target_vsel << vdd->vc_data->vc_common->data_shift) | |
| (vdd->pmic_info->pmic_reg << |
| vdd->vc_data->vc_common->regaddr_shift) | |
| (vdd->pmic_info->i2c_slave_addr << |
| vdd->vc_data->vc_common->slaveaddr_shift); |
| |
| vdd->write_reg(vc_bypass_value, prm_mod_offs, vc_bypass_val_reg); |
| vdd->write_reg(vc_bypass_value | vc_valid, prm_mod_offs, |
| vc_bypass_val_reg); |
| |
| vc_bypass_value = vdd->read_reg(prm_mod_offs, vc_bypass_val_reg); |
| /* |
| * Loop till the bypass command is acknowledged from the SMPS. |
| * NOTE: This is legacy code. The loop count and retry count needs |
| * to be revisited. |
| */ |
| while (!(vc_bypass_value & vc_valid)) { |
| loop_cnt++; |
| |
| if (retries_cnt > 10) { |
| pr_warning("%s: Retry count exceeded\n", __func__); |
| return -ETIMEDOUT; |
| } |
| |
| if (loop_cnt > 50) { |
| retries_cnt++; |
| loop_cnt = 0; |
| udelay(10); |
| } |
| vc_bypass_value = vdd->read_reg(prm_mod_offs, |
| vc_bypass_val_reg); |
| } |
| |
| _post_volt_scale(vdd, target_volt, target_vsel, current_vsel); |
| return 0; |
| } |
| |
| /* VP force update method of voltage scaling */ |
| static int vp_forceupdate_scale_voltage(struct omap_vdd_info *vdd, |
| unsigned long target_volt) |
| { |
| u32 vpconfig; |
| u8 target_vsel, current_vsel, prm_irqst_reg; |
| int ret, timeout = 0; |
| |
| ret = _pre_volt_scale(vdd, target_volt, &target_vsel, ¤t_vsel); |
| if (ret) |
| return ret; |
| |
| prm_irqst_reg = vdd->vp_data->prm_irqst_data->prm_irqst_reg; |
| |
| /* |
| * Clear all pending TransactionDone interrupt/status. Typical latency |
| * is <3us |
| */ |
| while (timeout++ < VP_TRANXDONE_TIMEOUT) { |
| vdd->write_reg(vdd->vp_data->prm_irqst_data->tranxdone_status, |
| prm_irqst_ocp_mod_offs, prm_irqst_reg); |
| if (!(vdd->read_reg(prm_irqst_ocp_mod_offs, prm_irqst_reg) & |
| vdd->vp_data->prm_irqst_data->tranxdone_status)) |
| break; |
| udelay(1); |
| } |
| if (timeout >= VP_TRANXDONE_TIMEOUT) { |
| pr_warning("%s: vdd_%s TRANXDONE timeout exceeded." |
| "Voltage change aborted", __func__, vdd->voltdm.name); |
| return -ETIMEDOUT; |
| } |
| |
| /* Configure for VP-Force Update */ |
| vpconfig = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig); |
| vpconfig &= ~(vdd->vp_data->vp_common->vpconfig_initvdd | |
| vdd->vp_data->vp_common->vpconfig_forceupdate | |
| vdd->vp_data->vp_common->vpconfig_initvoltage_mask); |
| vpconfig |= ((target_vsel << |
| vdd->vp_data->vp_common->vpconfig_initvoltage_shift)); |
| vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); |
| |
| /* Trigger initVDD value copy to voltage processor */ |
| vpconfig |= vdd->vp_data->vp_common->vpconfig_initvdd; |
| vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); |
| |
| /* Force update of voltage */ |
| vpconfig |= vdd->vp_data->vp_common->vpconfig_forceupdate; |
| vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); |
| |
| /* |
| * Wait for TransactionDone. Typical latency is <200us. |
| * Depends on SMPSWAITTIMEMIN/MAX and voltage change |
| */ |
| timeout = 0; |
| omap_test_timeout((vdd->read_reg(prm_irqst_ocp_mod_offs, prm_irqst_reg) & |
| vdd->vp_data->prm_irqst_data->tranxdone_status), |
| VP_TRANXDONE_TIMEOUT, timeout); |
| if (timeout >= VP_TRANXDONE_TIMEOUT) |
| pr_err("%s: vdd_%s TRANXDONE timeout exceeded." |
| "TRANXDONE never got set after the voltage update\n", |
| __func__, vdd->voltdm.name); |
| |
| _post_volt_scale(vdd, target_volt, target_vsel, current_vsel); |
| |
| /* |
| * Disable TransactionDone interrupt , clear all status, clear |
| * control registers |
| */ |
| timeout = 0; |
| while (timeout++ < VP_TRANXDONE_TIMEOUT) { |
| vdd->write_reg(vdd->vp_data->prm_irqst_data->tranxdone_status, |
| prm_irqst_ocp_mod_offs, prm_irqst_reg); |
| if (!(vdd->read_reg(prm_irqst_ocp_mod_offs, prm_irqst_reg) & |
| vdd->vp_data->prm_irqst_data->tranxdone_status)) |
| break; |
| udelay(1); |
| } |
| |
| if (timeout >= VP_TRANXDONE_TIMEOUT) |
| pr_warning("%s: vdd_%s TRANXDONE timeout exceeded while trying" |
| "to clear the TRANXDONE status\n", |
| __func__, vdd->voltdm.name); |
| |
| vpconfig = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig); |
| /* Clear initVDD copy trigger bit */ |
| vpconfig &= ~vdd->vp_data->vp_common->vpconfig_initvdd; |
| vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); |
| /* Clear force bit */ |
| vpconfig &= ~vdd->vp_data->vp_common->vpconfig_forceupdate; |
| vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); |
| |
| return 0; |
| } |
| |
| static void __init omap3_vfsm_init(struct omap_vdd_info *vdd) |
| { |
| /* |
| * Voltage Manager FSM parameters init |
| * XXX This data should be passed in from the board file |
| */ |
| vdd->write_reg(OMAP3_CLKSETUP, prm_mod_offs, OMAP3_PRM_CLKSETUP_OFFSET); |
| vdd->write_reg(OMAP3_VOLTOFFSET, prm_mod_offs, |
| OMAP3_PRM_VOLTOFFSET_OFFSET); |
| vdd->write_reg(OMAP3_VOLTSETUP2, prm_mod_offs, |
| OMAP3_PRM_VOLTSETUP2_OFFSET); |
| } |
| |
| static void __init omap3_vc_init(struct omap_vdd_info *vdd) |
| { |
| static bool is_initialized; |
| u8 on_vsel, onlp_vsel, ret_vsel, off_vsel; |
| u32 vc_val; |
| |
| if (is_initialized) |
| return; |
| |
| /* Set up the on, inactive, retention and off voltage */ |
| on_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->on_volt); |
| onlp_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->onlp_volt); |
| ret_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->ret_volt); |
| off_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->off_volt); |
| vc_val = ((on_vsel << vdd->vc_data->vc_common->cmd_on_shift) | |
| (onlp_vsel << vdd->vc_data->vc_common->cmd_onlp_shift) | |
| (ret_vsel << vdd->vc_data->vc_common->cmd_ret_shift) | |
| (off_vsel << vdd->vc_data->vc_common->cmd_off_shift)); |
| vdd->write_reg(vc_val, prm_mod_offs, vdd->vc_data->cmdval_reg); |
| |
| /* |
| * Generic VC parameters init |
| * XXX This data should be abstracted out |
| */ |
| vdd->write_reg(OMAP3430_CMD1_MASK | OMAP3430_RAV1_MASK, prm_mod_offs, |
| OMAP3_PRM_VC_CH_CONF_OFFSET); |
| vdd->write_reg(OMAP3430_MCODE_SHIFT | OMAP3430_HSEN_MASK, prm_mod_offs, |
| OMAP3_PRM_VC_I2C_CFG_OFFSET); |
| |
| omap3_vfsm_init(vdd); |
| |
| is_initialized = true; |
| } |
| |
| |
| /* OMAP4 specific voltage init functions */ |
| static void __init omap4_vc_init(struct omap_vdd_info *vdd) |
| { |
| static bool is_initialized; |
| u32 vc_val; |
| |
| if (is_initialized) |
| return; |
| |
| /* TODO: Configure setup times and CMD_VAL values*/ |
| |
| /* |
| * Generic VC parameters init |
| * XXX This data should be abstracted out |
| */ |
| vc_val = (OMAP4430_RAV_VDD_MPU_L_MASK | OMAP4430_CMD_VDD_MPU_L_MASK | |
| OMAP4430_RAV_VDD_IVA_L_MASK | OMAP4430_CMD_VDD_IVA_L_MASK | |
| OMAP4430_RAV_VDD_CORE_L_MASK | OMAP4430_CMD_VDD_CORE_L_MASK); |
| vdd->write_reg(vc_val, prm_mod_offs, OMAP4_PRM_VC_CFG_CHANNEL_OFFSET); |
| |
| /* XXX These are magic numbers and do not belong! */ |
| vc_val = (0x60 << OMAP4430_SCLL_SHIFT | 0x26 << OMAP4430_SCLH_SHIFT); |
| vdd->write_reg(vc_val, prm_mod_offs, OMAP4_PRM_VC_CFG_I2C_CLK_OFFSET); |
| |
| is_initialized = true; |
| } |
| |
| static void __init omap_vc_init(struct omap_vdd_info *vdd) |
| { |
| u32 vc_val; |
| |
| if (!vdd->pmic_info || !vdd->pmic_info->uv_to_vsel) { |
| pr_err("%s: PMIC info requried to configure vc for" |
| "vdd_%s not populated.Hence cannot initialize vc\n", |
| __func__, vdd->voltdm.name); |
| return; |
| } |
| |
| if (!vdd->read_reg || !vdd->write_reg) { |
| pr_err("%s: No read/write API for accessing vdd_%s regs\n", |
| __func__, vdd->voltdm.name); |
| return; |
| } |
| |
| /* Set up the SMPS_SA(i2c slave address in VC */ |
| vc_val = vdd->read_reg(prm_mod_offs, |
| vdd->vc_data->vc_common->smps_sa_reg); |
| vc_val &= ~vdd->vc_data->smps_sa_mask; |
| vc_val |= vdd->pmic_info->i2c_slave_addr << vdd->vc_data->smps_sa_shift; |
| vdd->write_reg(vc_val, prm_mod_offs, |
| vdd->vc_data->vc_common->smps_sa_reg); |
| |
| /* Setup the VOLRA(pmic reg addr) in VC */ |
| vc_val = vdd->read_reg(prm_mod_offs, |
| vdd->vc_data->vc_common->smps_volra_reg); |
| vc_val &= ~vdd->vc_data->smps_volra_mask; |
| vc_val |= vdd->pmic_info->pmic_reg << vdd->vc_data->smps_volra_shift; |
| vdd->write_reg(vc_val, prm_mod_offs, |
| vdd->vc_data->vc_common->smps_volra_reg); |
| |
| /* Configure the setup times */ |
| vc_val = vdd->read_reg(prm_mod_offs, vdd->vfsm->voltsetup_reg); |
| vc_val &= ~vdd->vfsm->voltsetup_mask; |
| vc_val |= vdd->pmic_info->volt_setup_time << |
| vdd->vfsm->voltsetup_shift; |
| vdd->write_reg(vc_val, prm_mod_offs, vdd->vfsm->voltsetup_reg); |
| |
| if (cpu_is_omap34xx()) |
| omap3_vc_init(vdd); |
| else if (cpu_is_omap44xx()) |
| omap4_vc_init(vdd); |
| } |
| |
| static int __init omap_vdd_data_configure(struct omap_vdd_info *vdd) |
| { |
| int ret = -EINVAL; |
| |
| if (!vdd->pmic_info) { |
| pr_err("%s: PMIC info requried to configure vdd_%s not" |
| "populated.Hence cannot initialize vdd_%s\n", |
| __func__, vdd->voltdm.name, vdd->voltdm.name); |
| goto ovdc_out; |
| } |
| |
| if (IS_ERR_VALUE(_config_common_vdd_data(vdd))) |
| goto ovdc_out; |
| |
| if (cpu_is_omap34xx()) { |
| vdd->read_reg = omap3_voltage_read_reg; |
| vdd->write_reg = omap3_voltage_write_reg; |
| ret = 0; |
| } else if (cpu_is_omap44xx()) { |
| vdd->read_reg = omap4_voltage_read_reg; |
| vdd->write_reg = omap4_voltage_write_reg; |
| ret = 0; |
| } |
| |
| ovdc_out: |
| return ret; |
| } |
| |
| /* Public functions */ |
| /** |
| * omap_voltage_get_nom_volt() - Gets the current non-auto-compensated voltage |
| * @voltdm: pointer to the VDD for which current voltage info is needed |
| * |
| * API to get the current non-auto-compensated voltage for a VDD. |
| * Returns 0 in case of error else returns the current voltage for the VDD. |
| */ |
| unsigned long omap_voltage_get_nom_volt(struct voltagedomain *voltdm) |
| { |
| struct omap_vdd_info *vdd; |
| |
| if (!voltdm || IS_ERR(voltdm)) { |
| pr_warning("%s: VDD specified does not exist!\n", __func__); |
| return 0; |
| } |
| |
| vdd = container_of(voltdm, struct omap_vdd_info, voltdm); |
| |
| return vdd->curr_volt; |
| } |
| |
| /** |
| * omap_vp_get_curr_volt() - API to get the current vp voltage. |
| * @voltdm: pointer to the VDD. |
| * |
| * This API returns the current voltage for the specified voltage processor |
| */ |
| unsigned long omap_vp_get_curr_volt(struct voltagedomain *voltdm) |
| { |
| struct omap_vdd_info *vdd; |
| u8 curr_vsel; |
| |
| if (!voltdm || IS_ERR(voltdm)) { |
| pr_warning("%s: VDD specified does not exist!\n", __func__); |
| return 0; |
| } |
| |
| vdd = container_of(voltdm, struct omap_vdd_info, voltdm); |
| if (!vdd->read_reg) { |
| pr_err("%s: No read API for reading vdd_%s regs\n", |
| __func__, voltdm->name); |
| return 0; |
| } |
| |
| curr_vsel = vdd->read_reg(prm_mod_offs, vdd->vp_data->voltage); |
| |
| if (!vdd->pmic_info || !vdd->pmic_info->vsel_to_uv) { |
| pr_warning("%s: PMIC function to convert vsel to voltage" |
| "in uV not registerd\n", __func__); |
| return 0; |
| } |
| |
| return vdd->pmic_info->vsel_to_uv(curr_vsel); |
| } |
| |
| /** |
| * omap_vp_enable() - API to enable a particular VP |
| * @voltdm: pointer to the VDD whose VP is to be enabled. |
| * |
| * This API enables a particular voltage processor. Needed by the smartreflex |
| * class drivers. |
| */ |
| void omap_vp_enable(struct voltagedomain *voltdm) |
| { |
| struct omap_vdd_info *vdd; |
| u32 vpconfig; |
| |
| if (!voltdm || IS_ERR(voltdm)) { |
| pr_warning("%s: VDD specified does not exist!\n", __func__); |
| return; |
| } |
| |
| vdd = container_of(voltdm, struct omap_vdd_info, voltdm); |
| if (!vdd->read_reg || !vdd->write_reg) { |
| pr_err("%s: No read/write API for accessing vdd_%s regs\n", |
| __func__, voltdm->name); |
| return; |
| } |
| |
| /* If VP is already enabled, do nothing. Return */ |
| if (vdd->vp_enabled) |
| return; |
| |
| vp_latch_vsel(vdd); |
| |
| /* Enable VP */ |
| vpconfig = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig); |
| vpconfig |= vdd->vp_data->vp_common->vpconfig_vpenable; |
| vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); |
| vdd->vp_enabled = true; |
| } |
| |
| /** |
| * omap_vp_disable() - API to disable a particular VP |
| * @voltdm: pointer to the VDD whose VP is to be disabled. |
| * |
| * This API disables a particular voltage processor. Needed by the smartreflex |
| * class drivers. |
| */ |
| void omap_vp_disable(struct voltagedomain *voltdm) |
| { |
| struct omap_vdd_info *vdd; |
| u32 vpconfig; |
| int timeout; |
| |
| if (!voltdm || IS_ERR(voltdm)) { |
| pr_warning("%s: VDD specified does not exist!\n", __func__); |
| return; |
| } |
| |
| vdd = container_of(voltdm, struct omap_vdd_info, voltdm); |
| if (!vdd->read_reg || !vdd->write_reg) { |
| pr_err("%s: No read/write API for accessing vdd_%s regs\n", |
| __func__, voltdm->name); |
| return; |
| } |
| |
| /* If VP is already disabled, do nothing. Return */ |
| if (!vdd->vp_enabled) { |
| pr_warning("%s: Trying to disable VP for vdd_%s when" |
| "it is already disabled\n", __func__, voltdm->name); |
| return; |
| } |
| |
| /* Disable VP */ |
| vpconfig = vdd->read_reg(prm_mod_offs, vdd->vp_data->vpconfig); |
| vpconfig &= ~vdd->vp_data->vp_common->vpconfig_vpenable; |
| vdd->write_reg(vpconfig, prm_mod_offs, vdd->vp_data->vpconfig); |
| |
| /* |
| * Wait for VP idle Typical latency is <2us. Maximum latency is ~100us |
| */ |
| omap_test_timeout((vdd->read_reg(prm_mod_offs, vdd->vp_data->vstatus)), |
| VP_IDLE_TIMEOUT, timeout); |
| |
| if (timeout >= VP_IDLE_TIMEOUT) |
| pr_warning("%s: vdd_%s idle timedout\n", |
| __func__, voltdm->name); |
| |
| vdd->vp_enabled = false; |
| |
| return; |
| } |
| |
| /** |
| * omap_voltage_scale_vdd() - API to scale voltage of a particular |
| * voltage domain. |
| * @voltdm: pointer to the VDD which is to be scaled. |
| * @target_volt: The target voltage of the voltage domain |
| * |
| * This API should be called by the kernel to do the voltage scaling |
| * for a particular voltage domain during dvfs or any other situation. |
| */ |
| int omap_voltage_scale_vdd(struct voltagedomain *voltdm, |
| unsigned long target_volt) |
| { |
| struct omap_vdd_info *vdd; |
| |
| if (!voltdm || IS_ERR(voltdm)) { |
| pr_warning("%s: VDD specified does not exist!\n", __func__); |
| return -EINVAL; |
| } |
| |
| vdd = container_of(voltdm, struct omap_vdd_info, voltdm); |
| |
| if (!vdd->volt_scale) { |
| pr_err("%s: No voltage scale API registered for vdd_%s\n", |
| __func__, voltdm->name); |
| return -ENODATA; |
| } |
| |
| return vdd->volt_scale(vdd, target_volt); |
| } |
| |
| /** |
| * omap_voltage_reset() - Resets the voltage of a particular voltage domain |
| * to that of the current OPP. |
| * @voltdm: pointer to the VDD whose voltage is to be reset. |
| * |
| * This API finds out the correct voltage the voltage domain is supposed |
| * to be at and resets the voltage to that level. Should be used especially |
| * while disabling any voltage compensation modules. |
| */ |
| void omap_voltage_reset(struct voltagedomain *voltdm) |
| { |
| unsigned long target_uvdc; |
| |
| if (!voltdm || IS_ERR(voltdm)) { |
| pr_warning("%s: VDD specified does not exist!\n", __func__); |
| return; |
| } |
| |
| target_uvdc = omap_voltage_get_nom_volt(voltdm); |
| if (!target_uvdc) { |
| pr_err("%s: unable to find current voltage for vdd_%s\n", |
| __func__, voltdm->name); |
| return; |
| } |
| |
| omap_voltage_scale_vdd(voltdm, target_uvdc); |
| } |
| |
| /** |
| * omap_voltage_get_volttable() - API to get the voltage table associated with a |
| * particular voltage domain. |
| * @voltdm: pointer to the VDD for which the voltage table is required |
| * @volt_data: the voltage table for the particular vdd which is to be |
| * populated by this API |
| * |
| * This API populates the voltage table associated with a VDD into the |
| * passed parameter pointer. Returns the count of distinct voltages |
| * supported by this vdd. |
| * |
| */ |
| void omap_voltage_get_volttable(struct voltagedomain *voltdm, |
| struct omap_volt_data **volt_data) |
| { |
| struct omap_vdd_info *vdd; |
| |
| if (!voltdm || IS_ERR(voltdm)) { |
| pr_warning("%s: VDD specified does not exist!\n", __func__); |
| return; |
| } |
| |
| vdd = container_of(voltdm, struct omap_vdd_info, voltdm); |
| |
| *volt_data = vdd->volt_data; |
| } |
| |
| /** |
| * omap_voltage_get_voltdata() - API to get the voltage table entry for a |
| * particular voltage |
| * @voltdm: pointer to the VDD whose voltage table has to be searched |
| * @volt: the voltage to be searched in the voltage table |
| * |
| * This API searches through the voltage table for the required voltage |
| * domain and tries to find a matching entry for the passed voltage volt. |
| * If a matching entry is found volt_data is populated with that entry. |
| * This API searches only through the non-compensated voltages int the |
| * voltage table. |
| * Returns pointer to the voltage table entry corresponding to volt on |
| * success. Returns -ENODATA if no voltage table exisits for the passed voltage |
| * domain or if there is no matching entry. |
| */ |
| struct omap_volt_data *omap_voltage_get_voltdata(struct voltagedomain *voltdm, |
| unsigned long volt) |
| { |
| struct omap_vdd_info *vdd; |
| int i; |
| |
| if (!voltdm || IS_ERR(voltdm)) { |
| pr_warning("%s: VDD specified does not exist!\n", __func__); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| vdd = container_of(voltdm, struct omap_vdd_info, voltdm); |
| |
| if (!vdd->volt_data) { |
| pr_warning("%s: voltage table does not exist for vdd_%s\n", |
| __func__, voltdm->name); |
| return ERR_PTR(-ENODATA); |
| } |
| |
| for (i = 0; vdd->volt_data[i].volt_nominal != 0; i++) { |
| if (vdd->volt_data[i].volt_nominal == volt) |
| return &vdd->volt_data[i]; |
| } |
| |
| pr_notice("%s: Unable to match the current voltage with the voltage" |
| "table for vdd_%s\n", __func__, voltdm->name); |
| |
| return ERR_PTR(-ENODATA); |
| } |
| |
| /** |
| * omap_voltage_register_pmic() - API to register PMIC specific data |
| * @voltdm: pointer to the VDD for which the PMIC specific data is |
| * to be registered |
| * @pmic_info: the structure containing pmic info |
| * |
| * This API is to be called by the SOC/PMIC file to specify the |
| * pmic specific info as present in omap_volt_pmic_info structure. |
| */ |
| int omap_voltage_register_pmic(struct voltagedomain *voltdm, |
| struct omap_volt_pmic_info *pmic_info) |
| { |
| struct omap_vdd_info *vdd; |
| |
| if (!voltdm || IS_ERR(voltdm)) { |
| pr_warning("%s: VDD specified does not exist!\n", __func__); |
| return -EINVAL; |
| } |
| |
| vdd = container_of(voltdm, struct omap_vdd_info, voltdm); |
| |
| vdd->pmic_info = pmic_info; |
| |
| return 0; |
| } |
| |
| /** |
| * omap_voltage_get_dbgdir() - API to get pointer to the debugfs directory |
| * corresponding to a voltage domain. |
| * |
| * @voltdm: pointer to the VDD whose debug directory is required. |
| * |
| * This API returns pointer to the debugfs directory corresponding |
| * to the voltage domain. Should be used by drivers requiring to |
| * add any debug entry for a particular voltage domain. Returns NULL |
| * in case of error. |
| */ |
| struct dentry *omap_voltage_get_dbgdir(struct voltagedomain *voltdm) |
| { |
| struct omap_vdd_info *vdd; |
| |
| if (!voltdm || IS_ERR(voltdm)) { |
| pr_warning("%s: VDD specified does not exist!\n", __func__); |
| return NULL; |
| } |
| |
| vdd = container_of(voltdm, struct omap_vdd_info, voltdm); |
| |
| return vdd->debug_dir; |
| } |
| |
| /** |
| * omap_change_voltscale_method() - API to change the voltage scaling method. |
| * @voltdm: pointer to the VDD whose voltage scaling method |
| * has to be changed. |
| * @voltscale_method: the method to be used for voltage scaling. |
| * |
| * This API can be used by the board files to change the method of voltage |
| * scaling between vpforceupdate and vcbypass. The parameter values are |
| * defined in voltage.h |
| */ |
| void omap_change_voltscale_method(struct voltagedomain *voltdm, |
| int voltscale_method) |
| { |
| struct omap_vdd_info *vdd; |
| |
| if (!voltdm || IS_ERR(voltdm)) { |
| pr_warning("%s: VDD specified does not exist!\n", __func__); |
| return; |
| } |
| |
| vdd = container_of(voltdm, struct omap_vdd_info, voltdm); |
| |
| switch (voltscale_method) { |
| case VOLTSCALE_VPFORCEUPDATE: |
| vdd->volt_scale = vp_forceupdate_scale_voltage; |
| return; |
| case VOLTSCALE_VCBYPASS: |
| vdd->volt_scale = vc_bypass_scale_voltage; |
| return; |
| default: |
| pr_warning("%s: Trying to change the method of voltage scaling" |
| "to an unsupported one!\n", __func__); |
| } |
| } |
| |
| /** |
| * omap_voltage_domain_lookup() - API to get the voltage domain pointer |
| * @name: Name of the voltage domain |
| * |
| * This API looks up in the global vdd_info struct for the |
| * existence of voltage domain <name>. If it exists, the API returns |
| * a pointer to the voltage domain structure corresponding to the |
| * VDD<name>. Else retuns error pointer. |
| */ |
| struct voltagedomain *omap_voltage_domain_lookup(char *name) |
| { |
| int i; |
| |
| if (!vdd_info) { |
| pr_err("%s: Voltage driver init not yet happened.Faulting!\n", |
| __func__); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| if (!name) { |
| pr_err("%s: No name to get the votage domain!\n", __func__); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| for (i = 0; i < nr_scalable_vdd; i++) { |
| if (!(strcmp(name, vdd_info[i]->voltdm.name))) |
| return &vdd_info[i]->voltdm; |
| } |
| |
| return ERR_PTR(-EINVAL); |
| } |
| |
| /** |
| * omap_voltage_late_init() - Init the various voltage parameters |
| * |
| * This API is to be called in the later stages of the |
| * system boot to init the voltage controller and |
| * voltage processors. |
| */ |
| int __init omap_voltage_late_init(void) |
| { |
| int i; |
| |
| if (!vdd_info) { |
| pr_err("%s: Voltage driver support not added\n", |
| __func__); |
| return -EINVAL; |
| } |
| |
| voltage_dir = debugfs_create_dir("voltage", NULL); |
| if (IS_ERR(voltage_dir)) |
| pr_err("%s: Unable to create voltage debugfs main dir\n", |
| __func__); |
| for (i = 0; i < nr_scalable_vdd; i++) { |
| if (omap_vdd_data_configure(vdd_info[i])) |
| continue; |
| omap_vc_init(vdd_info[i]); |
| vp_init(vdd_info[i]); |
| vdd_debugfs_init(vdd_info[i]); |
| } |
| |
| return 0; |
| } |
| |
| /* XXX document */ |
| int __init omap_voltage_early_init(s16 prm_mod, s16 prm_irqst_ocp_mod, |
| struct omap_vdd_info *omap_vdd_array[], |
| u8 omap_vdd_count) |
| { |
| prm_mod_offs = prm_mod; |
| prm_irqst_ocp_mod_offs = prm_irqst_ocp_mod; |
| vdd_info = omap_vdd_array; |
| nr_scalable_vdd = omap_vdd_count; |
| return 0; |
| } |