diff options
Diffstat (limited to 'arch/arm/mach-omap2/voltage.c')
| -rw-r--r-- | arch/arm/mach-omap2/voltage.c | 1108 |
1 files changed, 1108 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/voltage.c b/arch/arm/mach-omap2/voltage.c new file mode 100644 index 000000000000..c6facf7becf8 --- /dev/null +++ b/arch/arm/mach-omap2/voltage.c @@ -0,0 +1,1108 @@ +/* + * 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 expecially + * 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 + * sucess. 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; +} |