From patchwork Mon Dec 20 16:59:08 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thara Gopinath X-Patchwork-Id: 421661 X-Patchwork-Delegate: khilman@deeprootsystems.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id oBKGxY65009219 for ; Mon, 20 Dec 2010 16:59:53 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932899Ab0LTQ7s (ORCPT ); Mon, 20 Dec 2010 11:59:48 -0500 Received: from arroyo.ext.ti.com ([192.94.94.40]:57803 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932891Ab0LTQ7r (ORCPT ); Mon, 20 Dec 2010 11:59:47 -0500 Received: from dbdp31.itg.ti.com ([172.24.170.98]) by arroyo.ext.ti.com (8.13.7/8.13.7) with ESMTP id oBKGxPo3004271 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 20 Dec 2010 10:59:27 -0600 Received: from localhost.localdomain (localhost [127.0.0.1]) by dbdp31.itg.ti.com (8.13.8/8.13.8) with ESMTP id oBKGxJuV025246; Mon, 20 Dec 2010 22:29:22 +0530 (IST) From: Thara Gopinath To: linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: khilman@deeprootsystems.com, paul@pwsan.com, b-cousson@ti.com, vishwanath.bs@ti.com, sawant@ti.com, nm@ti.com, Thara Gopinath Subject: [PATCH v6 01/10] OMAP3: PM: Adding voltage driver support. Date: Mon, 20 Dec 2010 22:29:08 +0530 Message-Id: <1292864357-13939-2-git-send-email-thara@ti.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1292864357-13939-1-git-send-email-thara@ti.com> References: <1292864357-13939-1-git-send-email-thara@ti.com> Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter1.kernel.org [140.211.167.41]); Mon, 20 Dec 2010 16:59:53 +0000 (UTC) diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile index 7c79683..5034797 100644 --- a/arch/arm/mach-omap2/Makefile +++ b/arch/arm/mach-omap2/Makefile @@ -57,7 +57,8 @@ endif ifeq ($(CONFIG_PM),y) obj-$(CONFIG_ARCH_OMAP2) += pm24xx.o obj-$(CONFIG_ARCH_OMAP2) += sleep24xx.o pm_bus.o -obj-$(CONFIG_ARCH_OMAP3) += pm34xx.o sleep34xx.o cpuidle34xx.o pm_bus.o +obj-$(CONFIG_ARCH_OMAP3) += pm34xx.o sleep34xx.o voltage.o \ + cpuidle34xx.o pm_bus.o obj-$(CONFIG_ARCH_OMAP4) += pm44xx.o pm_bus.o obj-$(CONFIG_PM_DEBUG) += pm-debug.o diff --git a/arch/arm/mach-omap2/control.h b/arch/arm/mach-omap2/control.h index 5289461..9fe32dc 100644 --- a/arch/arm/mach-omap2/control.h +++ b/arch/arm/mach-omap2/control.h @@ -148,6 +148,15 @@ #define OMAP343X_CONTROL_TEST_KEY_11 (OMAP2_CONTROL_GENERAL + 0x00f4) #define OMAP343X_CONTROL_TEST_KEY_12 (OMAP2_CONTROL_GENERAL + 0x00f8) #define OMAP343X_CONTROL_TEST_KEY_13 (OMAP2_CONTROL_GENERAL + 0x00fc) +#define OMAP343X_CONTROL_FUSE_OPP1_VDD1 (OMAP2_CONTROL_GENERAL + 0x0110) +#define OMAP343X_CONTROL_FUSE_OPP2_VDD1 (OMAP2_CONTROL_GENERAL + 0x0114) +#define OMAP343X_CONTROL_FUSE_OPP3_VDD1 (OMAP2_CONTROL_GENERAL + 0x0118) +#define OMAP343X_CONTROL_FUSE_OPP4_VDD1 (OMAP2_CONTROL_GENERAL + 0x011c) +#define OMAP343X_CONTROL_FUSE_OPP5_VDD1 (OMAP2_CONTROL_GENERAL + 0x0120) +#define OMAP343X_CONTROL_FUSE_OPP1_VDD2 (OMAP2_CONTROL_GENERAL + 0x0124) +#define OMAP343X_CONTROL_FUSE_OPP2_VDD2 (OMAP2_CONTROL_GENERAL + 0x0128) +#define OMAP343X_CONTROL_FUSE_OPP3_VDD2 (OMAP2_CONTROL_GENERAL + 0x012c) +#define OMAP343X_CONTROL_FUSE_SR (OMAP2_CONTROL_GENERAL + 0x0130) #define OMAP343X_CONTROL_IVA2_BOOTADDR (OMAP2_CONTROL_GENERAL + 0x0190) #define OMAP343X_CONTROL_IVA2_BOOTMOD (OMAP2_CONTROL_GENERAL + 0x0194) #define OMAP343X_CONTROL_DEBOBS(i) (OMAP2_CONTROL_GENERAL + 0x01B0 \ @@ -164,6 +173,14 @@ #define OMAP343X_CONTROL_SRAMLDO5 (OMAP2_CONTROL_GENERAL + 0x02C0) #define OMAP343X_CONTROL_CSI (OMAP2_CONTROL_GENERAL + 0x02C4) +/* OMAP3630 only CONTROL_GENERAL register offsets */ +#define OMAP3630_CONTROL_FUSE_OPP1G_VDD1 (OMAP2_CONTROL_GENERAL + 0x0110) +#define OMAP3630_CONTROL_FUSE_OPP50_VDD1 (OMAP2_CONTROL_GENERAL + 0x0114) +#define OMAP3630_CONTROL_FUSE_OPP100_VDD1 (OMAP2_CONTROL_GENERAL + 0x0118) +#define OMAP3630_CONTROL_FUSE_OPP120_VDD1 (OMAP2_CONTROL_GENERAL + 0x0120) +#define OMAP3630_CONTROL_FUSE_OPP50_VDD2 (OMAP2_CONTROL_GENERAL + 0x0128) +#define OMAP3630_CONTROL_FUSE_OPP100_VDD2 (OMAP2_CONTROL_GENERAL + 0x012C) + /* AM35XX only CONTROL_GENERAL register offsets */ #define AM35XX_CONTROL_MSUSPENDMUX_6 (OMAP2_CONTROL_GENERAL + 0x0038) #define AM35XX_CONTROL_DEVCONF2 (OMAP2_CONTROL_GENERAL + 0x0310) diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c index 227a211..22adfb2 100644 --- a/arch/arm/mach-omap2/pm.c +++ b/arch/arm/mach-omap2/pm.c @@ -17,6 +17,7 @@ #include #include #include +#include #include "powerdomain.h" #include "clockdomain.h" @@ -145,3 +146,10 @@ static int __init omap2_common_pm_init(void) } postcore_initcall(omap2_common_pm_init); +static int __init omap2_common_pm_late_init(void) +{ + omap_voltage_late_init(); + + return 0; +} +late_initcall(omap2_common_pm_late_init); diff --git a/arch/arm/mach-omap2/voltage.c b/arch/arm/mach-omap2/voltage.c new file mode 100644 index 0000000..875667f --- /dev/null +++ b/arch/arm/mach-omap2/voltage.c @@ -0,0 +1,1226 @@ +/* + * OMAP3/OMAP4 Voltage Management Routines + * + * Author: Thara Gopinath + * + * Copyright (C) 2007 Texas Instruments, Inc. + * Rajendra Nayak + * Lesly A M + * + * Copyright (C) 2008 Nokia Corporation + * Kalle Jokiniemi + * + * Copyright (C) 2010 Texas Instruments, Inc. + * Thara Gopinath + * + * 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 +#include +#include +#include +#include +#include + +#include +#include + +#include "prm-regbits-34xx.h" +#include "control.h" + +#define VP_IDLE_TIMEOUT 200 +#define VP_TRANXDONE_TIMEOUT 300 +#define VOLTAGE_DIR_SIZE 16 + +/* Voltage processor register offsets */ +struct vp_reg_offs { + u8 vpconfig; + u8 vstepmin; + u8 vstepmax; + u8 vlimitto; + u8 vstatus; + u8 voltage; +}; + +/* Voltage Processor bit field values, shifts and masks */ +struct vp_reg_val { + /* PRM module */ + u16 prm_mod; + /* VPx_VPCONFIG */ + u32 vpconfig_erroroffset; + u16 vpconfig_errorgain; + u32 vpconfig_errorgain_mask; + u8 vpconfig_errorgain_shift; + u32 vpconfig_initvoltage_mask; + u8 vpconfig_initvoltage_shift; + u32 vpconfig_timeouten; + u32 vpconfig_initvdd; + u32 vpconfig_forceupdate; + u32 vpconfig_vpenable; + /* VPx_VSTEPMIN */ + u8 vstepmin_stepmin; + u16 vstepmin_smpswaittimemin; + u8 vstepmin_stepmin_shift; + u8 vstepmin_smpswaittimemin_shift; + /* VPx_VSTEPMAX */ + u8 vstepmax_stepmax; + u16 vstepmax_smpswaittimemax; + u8 vstepmax_stepmax_shift; + u8 vstepmax_smpswaittimemax_shift; + /* VPx_VLIMITTO */ + u8 vlimitto_vddmin; + u8 vlimitto_vddmax; + u16 vlimitto_timeout; + u8 vlimitto_vddmin_shift; + u8 vlimitto_vddmax_shift; + u8 vlimitto_timeout_shift; + /* PRM_IRQSTATUS*/ + u32 tranxdone_status; +}; + +/* Voltage controller registers and offsets */ +struct vc_reg_info { + /* PRM module */ + u16 prm_mod; + /* VC register offsets */ + u8 smps_sa_reg; + u8 smps_volra_reg; + u8 bypass_val_reg; + u8 cmdval_reg; + u8 voltsetup_reg; + /*VC_SMPS_SA*/ + u8 smps_sa_shift; + u32 smps_sa_mask; + /* VC_SMPS_VOL_RA */ + u8 smps_volra_shift; + u32 smps_volra_mask; + /* VC_BYPASS_VAL */ + u8 data_shift; + u8 slaveaddr_shift; + u8 regaddr_shift; + u32 valid; + /* VC_CMD_VAL */ + u8 cmd_on_shift; + u8 cmd_onlp_shift; + u8 cmd_ret_shift; + u8 cmd_off_shift; + u32 cmd_on_mask; + /* PRM_VOLTSETUP */ + u8 voltsetup_shift; + u32 voltsetup_mask; +}; + +/** + * omap_vdd_info - Per Voltage Domain info + * + * @volt_data : voltage table having the distinct voltages supported + * by the domain and other associated per voltage data. + * @pmic_info : pmic specific parameters which should be populted by + * the pmic drivers. + * @vp_offs : structure containing the offsets for various + * vp registers + * @vp_reg : the register values, shifts, masks for various + * vp registers + * @vc_reg : structure containing various various vc registers, + * shifts, masks etc. + * @voltdm : pointer to the voltage domain structure + * @debug_dir : debug directory for this voltage domain. + * @curr_volt : current voltage for this vdd. + * @ocp_mod : The prm module for accessing the prm irqstatus reg. + * @prm_irqst_reg : prm irqstatus register. + * @vp_enabled : flag to keep track of whether vp is enabled or not + * @volt_scale : API to scale the voltage of the vdd. + */ +struct omap_vdd_info { + struct omap_volt_data *volt_data; + struct omap_volt_pmic_info *pmic_info; + struct vp_reg_offs vp_offs; + struct vp_reg_val vp_reg; + struct vc_reg_info vc_reg; + struct voltagedomain voltdm; + struct dentry *debug_dir; + u32 curr_volt; + u16 ocp_mod; + u8 prm_irqst_reg; + bool vp_enabled; + u32 (*read_reg) (u16 mod, u8 offset); + void (*write_reg) (u32 val, u16 mod, u8 offset); + int (*volt_scale) (struct omap_vdd_info *vdd, + unsigned long target_volt); +}; + +static struct omap_vdd_info *vdd_info; +/* + * Number of scalable voltage domains. + */ +static int nr_scalable_vdd; + +/* OMAP3 VDD sturctures */ +static struct omap_vdd_info omap3_vdd_info[] = { + { + .vp_offs = { + .vpconfig = OMAP3_PRM_VP1_CONFIG_OFFSET, + .vstepmin = OMAP3_PRM_VP1_VSTEPMIN_OFFSET, + .vstepmax = OMAP3_PRM_VP1_VSTEPMAX_OFFSET, + .vlimitto = OMAP3_PRM_VP1_VLIMITTO_OFFSET, + .vstatus = OMAP3_PRM_VP1_STATUS_OFFSET, + .voltage = OMAP3_PRM_VP1_VOLTAGE_OFFSET, + }, + .voltdm = { + .name = "mpu", + }, + }, + { + .vp_offs = { + .vpconfig = OMAP3_PRM_VP2_CONFIG_OFFSET, + .vstepmin = OMAP3_PRM_VP2_VSTEPMIN_OFFSET, + .vstepmax = OMAP3_PRM_VP2_VSTEPMAX_OFFSET, + .vlimitto = OMAP3_PRM_VP2_VLIMITTO_OFFSET, + .vstatus = OMAP3_PRM_VP2_STATUS_OFFSET, + .voltage = OMAP3_PRM_VP2_VOLTAGE_OFFSET, + }, + .voltdm = { + .name = "core", + }, + }, +}; + +#define OMAP3_NR_SCALABLE_VDD ARRAY_SIZE(omap3_vdd_info) + +/* + * Structures containing OMAP3430/OMAP3630 voltage supported and various + * voltage dependent data for each VDD. + */ +#define VOLT_DATA_DEFINE(_v_nom, _efuse_offs, _errminlimit, _errgain) \ +{ \ + .volt_nominal = _v_nom, \ + .sr_efuse_offs = _efuse_offs, \ + .sr_errminlimit = _errminlimit, \ + .vp_errgain = _errgain \ +} + +/* VDD1 */ +static struct omap_volt_data omap34xx_vddmpu_volt_data[] = { + VOLT_DATA_DEFINE(OMAP3430_VDD_MPU_OPP1_UV, OMAP343X_CONTROL_FUSE_OPP1_VDD1, 0xf4, 0x0c), + VOLT_DATA_DEFINE(OMAP3430_VDD_MPU_OPP2_UV, OMAP343X_CONTROL_FUSE_OPP2_VDD1, 0xf4, 0x0c), + VOLT_DATA_DEFINE(OMAP3430_VDD_MPU_OPP3_UV, OMAP343X_CONTROL_FUSE_OPP3_VDD1, 0xf9, 0x18), + VOLT_DATA_DEFINE(OMAP3430_VDD_MPU_OPP4_UV, OMAP343X_CONTROL_FUSE_OPP4_VDD1, 0xf9, 0x18), + VOLT_DATA_DEFINE(OMAP3430_VDD_MPU_OPP5_UV, OMAP343X_CONTROL_FUSE_OPP5_VDD1, 0xf9, 0x18), + VOLT_DATA_DEFINE(0, 0, 0, 0), +}; + +static struct omap_volt_data omap36xx_vddmpu_volt_data[] = { + VOLT_DATA_DEFINE(OMAP3630_VDD_MPU_OPP50_UV, OMAP3630_CONTROL_FUSE_OPP50_VDD1, 0xf4, 0x0c), + VOLT_DATA_DEFINE(OMAP3630_VDD_MPU_OPP100_UV, OMAP3630_CONTROL_FUSE_OPP100_VDD1, 0xf9, 0x16), + VOLT_DATA_DEFINE(OMAP3630_VDD_MPU_OPP120_UV, OMAP3630_CONTROL_FUSE_OPP120_VDD1, 0xfa, 0x23), + VOLT_DATA_DEFINE(OMAP3630_VDD_MPU_OPP1G_UV, OMAP3630_CONTROL_FUSE_OPP1G_VDD1, 0xfa, 0x27), + VOLT_DATA_DEFINE(0, 0, 0, 0), +}; + +/* VDD2 */ +static struct omap_volt_data omap34xx_vddcore_volt_data[] = { + VOLT_DATA_DEFINE(OMAP3430_VDD_CORE_OPP1_UV, OMAP343X_CONTROL_FUSE_OPP1_VDD2, 0xf4, 0x0c), + VOLT_DATA_DEFINE(OMAP3430_VDD_CORE_OPP2_UV, OMAP343X_CONTROL_FUSE_OPP2_VDD2, 0xf4, 0x0c), + VOLT_DATA_DEFINE(OMAP3430_VDD_CORE_OPP3_UV, OMAP343X_CONTROL_FUSE_OPP3_VDD2, 0xf9, 0x18), + VOLT_DATA_DEFINE(0, 0, 0, 0), +}; + +static struct omap_volt_data omap36xx_vddcore_volt_data[] = { + VOLT_DATA_DEFINE(OMAP3630_VDD_CORE_OPP50_UV, OMAP3630_CONTROL_FUSE_OPP50_VDD2, 0xf4, 0x0c), + VOLT_DATA_DEFINE(OMAP3630_VDD_CORE_OPP100_UV, OMAP3630_CONTROL_FUSE_OPP100_VDD2, 0xf9, 0x16), + VOLT_DATA_DEFINE(0, 0, 0, 0), +}; + +static struct dentry *voltage_dir; + +/* Init function pointers */ +static void (*vc_init) (struct omap_vdd_info *vdd); +static int (*vdd_data_configure) (struct omap_vdd_info *vdd); + +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 void vp_latch_vsel(struct omap_vdd_info *vdd) +{ + u32 vpconfig; + u16 mod; + 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; + } + + mod = vdd->vp_reg.prm_mod; + + vsel = vdd->pmic_info->uv_to_vsel(uvdc); + + vpconfig = vdd->read_reg(mod, vdd->vp_offs.vpconfig); + vpconfig &= ~(vdd->vp_reg.vpconfig_initvoltage_mask | + vdd->vp_reg.vpconfig_initvdd); + vpconfig |= vsel << vdd->vp_reg.vpconfig_initvoltage_shift; + + vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig); + + /* Trigger initVDD value copy to voltage processor */ + vdd->write_reg((vpconfig | vdd->vp_reg.vpconfig_initvdd), mod, + vdd->vp_offs.vpconfig); + + /* Clear initVDD copy trigger bit */ + vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig); +} + +/* Generic voltage init functions */ +static void __init vp_init(struct omap_vdd_info *vdd) +{ + u32 vp_val; + u16 mod; + + 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; + } + + mod = vdd->vp_reg.prm_mod; + + vp_val = vdd->vp_reg.vpconfig_erroroffset | + (vdd->vp_reg.vpconfig_errorgain << + vdd->vp_reg.vpconfig_errorgain_shift) | + vdd->vp_reg.vpconfig_timeouten; + vdd->write_reg(vp_val, mod, vdd->vp_offs.vpconfig); + + vp_val = ((vdd->vp_reg.vstepmin_smpswaittimemin << + vdd->vp_reg.vstepmin_smpswaittimemin_shift) | + (vdd->vp_reg.vstepmin_stepmin << + vdd->vp_reg.vstepmin_stepmin_shift)); + vdd->write_reg(vp_val, mod, vdd->vp_offs.vstepmin); + + vp_val = ((vdd->vp_reg.vstepmax_smpswaittimemax << + vdd->vp_reg.vstepmax_smpswaittimemax_shift) | + (vdd->vp_reg.vstepmax_stepmax << + vdd->vp_reg.vstepmax_stepmax_shift)); + vdd->write_reg(vp_val, mod, vdd->vp_offs.vstepmax); + + vp_val = ((vdd->vp_reg.vlimitto_vddmax << + vdd->vp_reg.vlimitto_vddmax_shift) | + (vdd->vp_reg.vlimitto_vddmin << + vdd->vp_reg.vlimitto_vddmin_shift) | + (vdd->vp_reg.vlimitto_timeout << + vdd->vp_reg.vlimitto_timeout_shift)); + vdd->write_reg(vp_val, mod, vdd->vp_offs.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); + 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; + } +} + +/* 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; + u32 vc_cmdval, vp_errgain_val; + u16 vp_mod, vc_mod; + + /* 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; + } + + vp_mod = vdd->vp_reg.prm_mod; + vc_mod = vdd->vc_reg.prm_mod; + + /* 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(vp_mod, vdd->vp_offs.voltage); + + /* Setting the ON voltage to the new target voltage */ + vc_cmdval = vdd->read_reg(vc_mod, vdd->vc_reg.cmdval_reg); + vc_cmdval &= ~vdd->vc_reg.cmd_on_mask; + vc_cmdval |= (*target_vsel << vdd->vc_reg.cmd_on_shift); + vdd->write_reg(vc_cmdval, vc_mod, vdd->vc_reg.cmdval_reg); + + /* Setting vp errorgain based on the voltage */ + if (volt_data) { + vp_errgain_val = vdd->read_reg(vp_mod, + vdd->vp_offs.vpconfig); + vdd->vp_reg.vpconfig_errorgain = volt_data->vp_errgain; + vp_errgain_val &= ~vdd->vp_reg.vpconfig_errorgain_mask; + vp_errgain_val |= vdd->vp_reg.vpconfig_errorgain << + vdd->vp_reg.vpconfig_errorgain_shift; + vdd->write_reg(vp_errgain_val, vp_mod, + vdd->vp_offs.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; + u16 mod; + u8 target_vsel, current_vsel; + int ret; + + ret = _pre_volt_scale(vdd, target_volt, &target_vsel, ¤t_vsel); + if (ret) + return ret; + + mod = vdd->vc_reg.prm_mod; + + vc_valid = vdd->vc_reg.valid; + vc_bypass_val_reg = vdd->vc_reg.bypass_val_reg; + vc_bypass_value = (target_vsel << vdd->vc_reg.data_shift) | + (vdd->pmic_info->pmic_reg << + vdd->vc_reg.regaddr_shift) | + (vdd->pmic_info->i2c_slave_addr << + vdd->vc_reg.slaveaddr_shift); + + vdd->write_reg(vc_bypass_value, mod, vc_bypass_val_reg); + vdd->write_reg(vc_bypass_value | vc_valid, mod, vc_bypass_val_reg); + + vc_bypass_value = vdd->read_reg(mod, 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(mod, 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; + u16 mod, ocp_mod; + 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; + + mod = vdd->vp_reg.prm_mod; + ocp_mod = vdd->ocp_mod; + prm_irqst_reg = vdd->prm_irqst_reg; + + /* + * Clear all pending TransactionDone interrupt/status. Typical latency + * is <3us + */ + while (timeout++ < VP_TRANXDONE_TIMEOUT) { + vdd->write_reg(vdd->vp_reg.tranxdone_status, + ocp_mod, prm_irqst_reg); + if (!(vdd->read_reg(ocp_mod, prm_irqst_reg) & + vdd->vp_reg.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(mod, vdd->vp_offs.vpconfig); + vpconfig &= ~(vdd->vp_reg.vpconfig_initvdd | + vdd->vp_reg.vpconfig_forceupdate | + vdd->vp_reg.vpconfig_initvoltage_mask); + vpconfig |= ((target_vsel << + vdd->vp_reg.vpconfig_initvoltage_shift)); + vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig); + + /* Trigger initVDD value copy to voltage processor */ + vpconfig |= vdd->vp_reg.vpconfig_initvdd; + vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig); + + /* Force update of voltage */ + vpconfig |= vdd->vp_reg.vpconfig_forceupdate; + vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig); + + /* + * Wait for TransactionDone. Typical latency is <200us. + * Depends on SMPSWAITTIMEMIN/MAX and voltage change + */ + timeout = 0; + omap_test_timeout((vdd->read_reg(ocp_mod, prm_irqst_reg) & + vdd->vp_reg.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_reg.tranxdone_status, + ocp_mod, prm_irqst_reg); + if (!(vdd->read_reg(ocp_mod, prm_irqst_reg) & + vdd->vp_reg.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(mod, vdd->vp_offs.vpconfig); + /* Clear initVDD copy trigger bit */ + vpconfig &= ~vdd->vp_reg.vpconfig_initvdd;; + vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig); + /* Clear force bit */ + vpconfig &= ~vdd->vp_reg.vpconfig_forceupdate; + vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig); + + return 0; +} + +/* OMAP3 specific voltage init functions */ + +/* + * Intializes the voltage controller registers with the PMIC and board + * specific parameters and voltage setup times for OMAP3. + */ +static void __init omap3_vc_init(struct omap_vdd_info *vdd) +{ + u32 vc_val; + u16 mod; + u8 on_vsel, onlp_vsel, ret_vsel, off_vsel; + static bool is_initialized; + + 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; + } + + mod = vdd->vc_reg.prm_mod; + + /* Set up the SMPS_SA(i2c slave address in VC */ + vc_val = vdd->read_reg(mod, vdd->vc_reg.smps_sa_reg); + vc_val &= ~vdd->vc_reg.smps_sa_mask; + vc_val |= vdd->pmic_info->i2c_slave_addr << vdd->vc_reg.smps_sa_shift; + vdd->write_reg(vc_val, mod, vdd->vc_reg.smps_sa_reg); + + /* Setup the VOLRA(pmic reg addr) in VC */ + vc_val = vdd->read_reg(mod, vdd->vc_reg.smps_volra_reg); + vc_val &= ~vdd->vc_reg.smps_volra_mask; + vc_val |= vdd->pmic_info->pmic_reg << vdd->vc_reg.smps_volra_shift; + vdd->write_reg(vc_val, mod, vdd->vc_reg.smps_volra_reg); + + /*Configure the setup times */ + vc_val = vdd->read_reg(mod, vdd->vc_reg.voltsetup_reg); + vc_val &= ~vdd->vc_reg.voltsetup_mask; + vc_val |= vdd->pmic_info->volt_setup_time << + vdd->vc_reg.voltsetup_shift; + vdd->write_reg(vc_val, mod, vdd->vc_reg.voltsetup_reg); + + /* 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_reg.cmd_on_shift) | + (onlp_vsel << vdd->vc_reg.cmd_onlp_shift) | + (ret_vsel << vdd->vc_reg.cmd_ret_shift) | + (off_vsel << vdd->vc_reg.cmd_off_shift)); + vdd->write_reg(vc_val, mod, vdd->vc_reg.cmdval_reg); + + if (is_initialized) + return; + + /* Generic VC parameters init */ + vdd->write_reg(OMAP3430_CMD1_MASK | OMAP3430_RAV1_MASK, mod, + OMAP3_PRM_VC_CH_CONF_OFFSET); + vdd->write_reg(OMAP3430_MCODE_SHIFT | OMAP3430_HSEN_MASK, mod, + OMAP3_PRM_VC_I2C_CFG_OFFSET); + vdd->write_reg(OMAP3_CLKSETUP, mod, OMAP3_PRM_CLKSETUP_OFFSET); + vdd->write_reg(OMAP3_VOLTOFFSET, mod, OMAP3_PRM_VOLTOFFSET_OFFSET); + vdd->write_reg(OMAP3_VOLTSETUP2, mod, OMAP3_PRM_VOLTSETUP2_OFFSET); + is_initialized = true; +} + +/* Sets up all the VDD related info for OMAP3 */ +static int __init omap3_vdd_data_configure(struct omap_vdd_info *vdd) +{ + struct clk *sys_ck; + u32 sys_clk_speed, timeout_val, waittime; + + 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); + return -EINVAL; + } + + if (!strcmp(vdd->voltdm.name, "mpu")) { + if (cpu_is_omap3630()) + vdd->volt_data = omap36xx_vddmpu_volt_data; + else + vdd->volt_data = omap34xx_vddmpu_volt_data; + + vdd->vp_reg.tranxdone_status = OMAP3430_VP1_TRANXDONE_ST_MASK; + vdd->vc_reg.cmdval_reg = OMAP3_PRM_VC_CMD_VAL_0_OFFSET; + vdd->vc_reg.smps_sa_shift = OMAP3430_PRM_VC_SMPS_SA_SA0_SHIFT; + vdd->vc_reg.smps_sa_mask = OMAP3430_PRM_VC_SMPS_SA_SA0_MASK; + vdd->vc_reg.smps_volra_shift = OMAP3430_VOLRA0_SHIFT; + vdd->vc_reg.smps_volra_mask = OMAP3430_VOLRA0_MASK; + vdd->vc_reg.voltsetup_shift = OMAP3430_SETUP_TIME1_SHIFT; + vdd->vc_reg.voltsetup_mask = OMAP3430_SETUP_TIME1_MASK; + } else if (!strcmp(vdd->voltdm.name, "core")) { + if (cpu_is_omap3630()) + vdd->volt_data = omap36xx_vddcore_volt_data; + else + vdd->volt_data = omap34xx_vddcore_volt_data; + + vdd->vp_reg.tranxdone_status = OMAP3430_VP2_TRANXDONE_ST_MASK; + vdd->vc_reg.cmdval_reg = OMAP3_PRM_VC_CMD_VAL_1_OFFSET; + vdd->vc_reg.smps_sa_shift = OMAP3430_PRM_VC_SMPS_SA_SA1_SHIFT; + vdd->vc_reg.smps_sa_mask = OMAP3430_PRM_VC_SMPS_SA_SA1_MASK; + vdd->vc_reg.smps_volra_shift = OMAP3430_VOLRA1_SHIFT; + vdd->vc_reg.smps_volra_mask = OMAP3430_VOLRA1_MASK; + vdd->vc_reg.voltsetup_shift = OMAP3430_SETUP_TIME2_SHIFT; + vdd->vc_reg.voltsetup_mask = OMAP3430_SETUP_TIME2_MASK; + } else { + pr_warning("%s: vdd_%s does not exisit in OMAP3\n", + __func__, vdd->voltdm.name); + return -EINVAL; + } + + /* + * Sys clk rate is require to calculate vp timeout value and + * smpswaittimemin and smpswaittimemax. + */ + sys_ck = clk_get(NULL, "sys_ck"); + 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->ocp_mod = OCP_MOD; + vdd->prm_irqst_reg = OMAP3_PRM_IRQSTATUS_MPU_OFFSET; + vdd->read_reg = omap3_voltage_read_reg; + vdd->write_reg = omap3_voltage_write_reg; + vdd->volt_scale = vp_forceupdate_scale_voltage; + vdd->vp_enabled = false; + + /* VC parameters */ + vdd->vc_reg.prm_mod = OMAP3430_GR_MOD; + vdd->vc_reg.smps_sa_reg = OMAP3_PRM_VC_SMPS_SA_OFFSET; + vdd->vc_reg.smps_volra_reg = OMAP3_PRM_VC_SMPS_VOL_RA_OFFSET; + vdd->vc_reg.bypass_val_reg = OMAP3_PRM_VC_BYPASS_VAL_OFFSET; + vdd->vc_reg.voltsetup_reg = OMAP3_PRM_VOLTSETUP1_OFFSET; + vdd->vc_reg.data_shift = OMAP3430_DATA_SHIFT; + vdd->vc_reg.slaveaddr_shift = OMAP3430_SLAVEADDR_SHIFT; + vdd->vc_reg.regaddr_shift = OMAP3430_REGADDR_SHIFT; + vdd->vc_reg.valid = OMAP3430_VALID_MASK; + vdd->vc_reg.cmd_on_shift = OMAP3430_VC_CMD_ON_SHIFT; + vdd->vc_reg.cmd_on_mask = OMAP3430_VC_CMD_ON_MASK; + vdd->vc_reg.cmd_onlp_shift = OMAP3430_VC_CMD_ONLP_SHIFT; + vdd->vc_reg.cmd_ret_shift = OMAP3430_VC_CMD_RET_SHIFT; + vdd->vc_reg.cmd_off_shift = OMAP3430_VC_CMD_OFF_SHIFT; + + vdd->vp_reg.prm_mod = OMAP3430_GR_MOD; + + /* VPCONFIG bit fields */ + vdd->vp_reg.vpconfig_erroroffset = (vdd->pmic_info->vp_erroroffset << + OMAP3430_ERROROFFSET_SHIFT); + vdd->vp_reg.vpconfig_errorgain_mask = OMAP3430_ERRORGAIN_MASK; + vdd->vp_reg.vpconfig_errorgain_shift = OMAP3430_ERRORGAIN_SHIFT; + vdd->vp_reg.vpconfig_initvoltage_shift = OMAP3430_INITVOLTAGE_SHIFT; + vdd->vp_reg.vpconfig_initvoltage_mask = OMAP3430_INITVOLTAGE_MASK; + vdd->vp_reg.vpconfig_timeouten = OMAP3430_TIMEOUTEN_MASK; + vdd->vp_reg.vpconfig_initvdd = OMAP3430_INITVDD_MASK; + vdd->vp_reg.vpconfig_forceupdate = OMAP3430_FORCEUPDATE_MASK; + vdd->vp_reg.vpconfig_vpenable = OMAP3430_VPENABLE_MASK; + + /* VSTEPMIN VSTEPMAX bit fields */ + waittime = ((vdd->pmic_info->step_size / vdd->pmic_info->slew_rate) * + sys_clk_speed) / 1000; + vdd->vp_reg.vstepmin_smpswaittimemin = waittime; + vdd->vp_reg.vstepmax_smpswaittimemax = waittime; + vdd->vp_reg.vstepmin_stepmin = vdd->pmic_info->vp_vstepmin; + vdd->vp_reg.vstepmax_stepmax = vdd->pmic_info->vp_vstepmax; + vdd->vp_reg.vstepmin_smpswaittimemin_shift = + OMAP3430_SMPSWAITTIMEMIN_SHIFT; + vdd->vp_reg.vstepmax_smpswaittimemax_shift = + OMAP3430_SMPSWAITTIMEMAX_SHIFT; + vdd->vp_reg.vstepmin_stepmin_shift = OMAP3430_VSTEPMIN_SHIFT; + vdd->vp_reg.vstepmax_stepmax_shift = OMAP3430_VSTEPMAX_SHIFT; + + /* VLIMITTO bit fields */ + timeout_val = (sys_clk_speed * vdd->pmic_info->vp_timeout_us) / 1000; + vdd->vp_reg.vlimitto_timeout = timeout_val; + vdd->vp_reg.vlimitto_vddmin = vdd->pmic_info->vp_vddmin; + vdd->vp_reg.vlimitto_vddmax = vdd->pmic_info->vp_vddmax; + vdd->vp_reg.vlimitto_vddmin_shift = OMAP3430_VDDMIN_SHIFT; + vdd->vp_reg.vlimitto_vddmax_shift = OMAP3430_VDDMAX_SHIFT; + vdd->vp_reg.vlimitto_timeout_shift = OMAP3430_TIMEOUT_SHIFT; + + return 0; +} + +/* 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(vdd->vp_reg.prm_mod, + vdd->vp_offs.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; + u16 mod; + + 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; + } + + mod = vdd->vp_reg.prm_mod; + + /* If VP is already enabled, do nothing. Return */ + if (vdd->vp_enabled) + return; + + vp_latch_vsel(vdd); + + /* Enable VP */ + vpconfig = vdd->read_reg(mod, vdd->vp_offs.vpconfig); + vpconfig |= vdd->vp_reg.vpconfig_vpenable; + vdd->write_reg(vpconfig, mod, vdd->vp_offs.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; + u16 mod; + 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; + } + + mod = vdd->vp_reg.prm_mod; + + /* 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(mod, vdd->vp_offs.vpconfig); + vpconfig &= ~vdd->vp_reg.vpconfig_vpenable; + vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig); + + /* + * Wait for VP idle Typical latency is <2us. Maximum latency is ~100us + */ + omap_test_timeout((vdd->read_reg(mod, vdd->vp_offs.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 . If it exists, the API returns + * a pointer to the voltage domain structure corresponding to the + * VDD. 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 (vdd_data_configure(&vdd_info[i])) + continue; + vc_init(&vdd_info[i]); + vp_init(&vdd_info[i]); + vdd_debugfs_init(&vdd_info[i]); + } + + return 0; +} + +/** + * omap_voltage_early_init()- Volatage driver early init + */ +static int __init omap_voltage_early_init(void) +{ + if (cpu_is_omap34xx()) { + vdd_info = omap3_vdd_info; + nr_scalable_vdd = OMAP3_NR_SCALABLE_VDD; + vc_init = omap3_vc_init; + vdd_data_configure = omap3_vdd_data_configure; + } else { + pr_warning("%s: voltage driver support not added\n", __func__); + } + + return 0; +} +core_initcall(omap_voltage_early_init); diff --git a/arch/arm/plat-omap/include/plat/voltage.h b/arch/arm/plat-omap/include/plat/voltage.h new file mode 100644 index 0000000..2f4f59a --- /dev/null +++ b/arch/arm/plat-omap/include/plat/voltage.h @@ -0,0 +1,134 @@ +/* + * OMAP Voltage Management Routines + * + * Author: Thara Gopinath + * + * Copyright (C) 2009 Texas Instruments, Inc. + * Thara Gopinath + * + * 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. + */ + +#ifndef __ARCH_ARM_MACH_OMAP2_VOLTAGE_H +#define __ARCH_ARM_MACH_OMAP2_VOLTAGE_H + +#define VOLTSCALE_VPFORCEUPDATE 1 +#define VOLTSCALE_VCBYPASS 2 + +/* + * OMAP3 GENERIC setup times. Revisit to see if these needs to be + * passed from board or PMIC file + */ +#define OMAP3_CLKSETUP 0xff +#define OMAP3_VOLTOFFSET 0xff +#define OMAP3_VOLTSETUP2 0xff + +/* Voltage value defines */ +#define OMAP3430_VDD_MPU_OPP1_UV 975000 +#define OMAP3430_VDD_MPU_OPP2_UV 1075000 +#define OMAP3430_VDD_MPU_OPP3_UV 1200000 +#define OMAP3430_VDD_MPU_OPP4_UV 1270000 +#define OMAP3430_VDD_MPU_OPP5_UV 1350000 + +#define OMAP3430_VDD_CORE_OPP1_UV 975000 +#define OMAP3430_VDD_CORE_OPP2_UV 1050000 +#define OMAP3430_VDD_CORE_OPP3_UV 1150000 + +#define OMAP3630_VDD_MPU_OPP50_UV 1012500 +#define OMAP3630_VDD_MPU_OPP100_UV 1200000 +#define OMAP3630_VDD_MPU_OPP120_UV 1325000 +#define OMAP3630_VDD_MPU_OPP1G_UV 1375000 + +#define OMAP3630_VDD_CORE_OPP50_UV 1000000 +#define OMAP3630_VDD_CORE_OPP100_UV 1200000 + +/** + * struct voltagedomain - omap voltage domain global structure. + * @name: Name of the voltage domain which can be used as a unique + * identifier. + */ +struct voltagedomain { + char *name; +}; + +/* API to get the voltagedomain pointer */ +struct voltagedomain *omap_voltage_domain_lookup(char *name); + +/** + * struct omap_volt_data - Omap voltage specific data. + * @voltage_nominal: The possible voltage value in uV + * @sr_efuse_offs: The offset of the efuse register(from system + * control module base address) from where to read + * the n-target value for the smartreflex module. + * @sr_errminlimit: Error min limit value for smartreflex. This value + * differs at differnet opp and thus is linked + * with voltage. + * @vp_errorgain: Error gain value for the voltage processor. This + * field also differs according to the voltage/opp. + */ +struct omap_volt_data { + u32 volt_nominal; + u32 sr_efuse_offs; + u8 sr_errminlimit; + u8 vp_errgain; +}; + +/** + * struct omap_volt_pmic_info - PMIC specific data required by voltage driver. + * @slew_rate: PMIC slew rate (in uv/us) + * @step_size: PMIC voltage step size (in uv) + * @vsel_to_uv: PMIC API to convert vsel value to actual voltage in uV. + * @uv_to_vsel: PMIC API to convert voltage in uV to vsel value. + */ +struct omap_volt_pmic_info { + int slew_rate; + int step_size; + u32 on_volt; + u32 onlp_volt; + u32 ret_volt; + u32 off_volt; + u16 volt_setup_time; + u8 vp_erroroffset; + u8 vp_vstepmin; + u8 vp_vstepmax; + u8 vp_vddmin; + u8 vp_vddmax; + u8 vp_timeout_us; + u8 i2c_slave_addr; + u8 pmic_reg; + unsigned long (*vsel_to_uv) (const u8 vsel); + u8 (*uv_to_vsel) (unsigned long uV); +}; + +unsigned long omap_vp_get_curr_volt(struct voltagedomain *voltdm); +void omap_vp_enable(struct voltagedomain *voltdm); +void omap_vp_disable(struct voltagedomain *voltdm); +int omap_voltage_scale_vdd(struct voltagedomain *voltdm, + unsigned long target_volt); +void omap_voltage_reset(struct voltagedomain *voltdm); +void omap_voltage_get_volttable(struct voltagedomain *voltdm, + struct omap_volt_data **volt_data); +struct omap_volt_data *omap_voltage_get_voltdata(struct voltagedomain *voltdm, + unsigned long volt); +unsigned long omap_voltage_get_nom_volt(struct voltagedomain *voltdm); +struct dentry *omap_voltage_get_dbgdir(struct voltagedomain *voltdm); +#ifdef CONFIG_PM +int omap_voltage_register_pmic(struct voltagedomain *voltdm, + struct omap_volt_pmic_info *pmic_info); +void omap_change_voltscale_method(struct voltagedomain *voltdm, + int voltscale_method); +int omap_voltage_late_init(void); +#else +static inline int omap_voltage_register_pmic(struct voltagedomain *voltdm, + struct omap_volt_pmic_info *pmic_info) {} +static inline void omap_change_voltscale_method(struct voltagedomain *voltdm, + int voltscale_method) {} +static inline int omap_voltage_late_init(void) +{ + return -EINVAL; +} +#endif + +#endif