/* * Copyright (C) ST-Ericsson SA 2010 * * License Terms: GNU General Public License v2 * Authors: Sundar Iyer for ST-Ericsson * Bengt Jonsson for ST-Ericsson * * Power domain regulators on DB8500 */ #include #include #include #include #include #include #include #include #include #include /* * power state reference count */ static int power_state_active_cnt; /* will initialize to zero */ static DEFINE_SPINLOCK(power_state_active_lock); static void power_state_active_enable(void) { unsigned long flags; spin_lock_irqsave(&power_state_active_lock, flags); power_state_active_cnt++; spin_unlock_irqrestore(&power_state_active_lock, flags); } static int power_state_active_disable(void) { int ret = 0; unsigned long flags; spin_lock_irqsave(&power_state_active_lock, flags); if (power_state_active_cnt <= 0) { pr_err("power state: unbalanced enable/disable calls\n"); ret = -EINVAL; goto out; } power_state_active_cnt--; out: spin_unlock_irqrestore(&power_state_active_lock, flags); return ret; } /* * Exported interface for CPUIdle only. This function is called when interrupts * are turned off. Hence, no locking. */ int power_state_active_is_enabled(void) { return (power_state_active_cnt > 0); } /** * struct db8500_regulator_info - db8500 regulator information * @dev: device pointer * @desc: regulator description * @rdev: regulator device pointer * @is_enabled: status of the regulator * @epod_id: id for EPOD (power domain) * @is_ramret: RAM retention switch for EPOD (power domain) * @operating_point: operating point (only for vape, to be removed) * */ struct db8500_regulator_info { struct device *dev; struct regulator_desc desc; struct regulator_dev *rdev; bool is_enabled; u16 epod_id; bool is_ramret; bool exclude_from_power_state; unsigned int operating_point; }; static int db8500_regulator_enable(struct regulator_dev *rdev) { struct db8500_regulator_info *info = rdev_get_drvdata(rdev); if (info == NULL) return -EINVAL; dev_vdbg(rdev_get_dev(rdev), "regulator-%s-enable\n", info->desc.name); info->is_enabled = true; if (!info->exclude_from_power_state) power_state_active_enable(); return 0; } static int db8500_regulator_disable(struct regulator_dev *rdev) { struct db8500_regulator_info *info = rdev_get_drvdata(rdev); int ret = 0; if (info == NULL) return -EINVAL; dev_vdbg(rdev_get_dev(rdev), "regulator-%s-disable\n", info->desc.name); info->is_enabled = false; if (!info->exclude_from_power_state) ret = power_state_active_disable(); return ret; } static int db8500_regulator_is_enabled(struct regulator_dev *rdev) { struct db8500_regulator_info *info = rdev_get_drvdata(rdev); if (info == NULL) return -EINVAL; dev_vdbg(rdev_get_dev(rdev), "regulator-%s-is_enabled (is_enabled):" " %i\n", info->desc.name, info->is_enabled); return info->is_enabled; } /* db8500 regulator operations */ static struct regulator_ops db8500_regulator_ops = { .enable = db8500_regulator_enable, .disable = db8500_regulator_disable, .is_enabled = db8500_regulator_is_enabled, }; /* * EPOD control */ static bool epod_on[NUM_EPOD_ID]; static bool epod_ramret[NUM_EPOD_ID]; static int enable_epod(u16 epod_id, bool ramret) { int ret; if (ramret) { if (!epod_on[epod_id]) { ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET); if (ret < 0) return ret; } epod_ramret[epod_id] = true; } else { ret = prcmu_set_epod(epod_id, EPOD_STATE_ON); if (ret < 0) return ret; epod_on[epod_id] = true; } return 0; } static int disable_epod(u16 epod_id, bool ramret) { int ret; if (ramret) { if (!epod_on[epod_id]) { ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF); if (ret < 0) return ret; } epod_ramret[epod_id] = false; } else { if (epod_ramret[epod_id]) { ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET); if (ret < 0) return ret; } else { ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF); if (ret < 0) return ret; } epod_on[epod_id] = false; } return 0; } /* * Regulator switch */ static int db8500_regulator_switch_enable(struct regulator_dev *rdev) { struct db8500_regulator_info *info = rdev_get_drvdata(rdev); int ret; if (info == NULL) return -EINVAL; dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-enable\n", info->desc.name); ret = enable_epod(info->epod_id, info->is_ramret); if (ret < 0) { dev_err(rdev_get_dev(rdev), "regulator-switch-%s-enable: prcmu call failed\n", info->desc.name); goto out; } info->is_enabled = true; out: return ret; } static int db8500_regulator_switch_disable(struct regulator_dev *rdev) { struct db8500_regulator_info *info = rdev_get_drvdata(rdev); int ret; if (info == NULL) return -EINVAL; dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-disable\n", info->desc.name); ret = disable_epod(info->epod_id, info->is_ramret); if (ret < 0) { dev_err(rdev_get_dev(rdev), "regulator_switch-%s-disable: prcmu call failed\n", info->desc.name); goto out; } info->is_enabled = 0; out: return ret; } static int db8500_regulator_switch_is_enabled(struct regulator_dev *rdev) { struct db8500_regulator_info *info = rdev_get_drvdata(rdev); if (info == NULL) return -EINVAL; dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-is_enabled (is_enabled): %i\n", info->desc.name, info->is_enabled); return info->is_enabled; } static struct regulator_ops db8500_regulator_switch_ops = { .enable = db8500_regulator_switch_enable, .disable = db8500_regulator_switch_disable, .is_enabled = db8500_regulator_switch_is_enabled, }; /* * Regulator information */ static struct db8500_regulator_info db8500_regulator_info[DB8500_NUM_REGULATORS] = { [DB8500_REGULATOR_VAPE] = { .desc = { .name = "db8500-vape", .id = DB8500_REGULATOR_VAPE, .ops = &db8500_regulator_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, }, [DB8500_REGULATOR_VARM] = { .desc = { .name = "db8500-varm", .id = DB8500_REGULATOR_VARM, .ops = &db8500_regulator_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, }, [DB8500_REGULATOR_VMODEM] = { .desc = { .name = "db8500-vmodem", .id = DB8500_REGULATOR_VMODEM, .ops = &db8500_regulator_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, }, [DB8500_REGULATOR_VPLL] = { .desc = { .name = "db8500-vpll", .id = DB8500_REGULATOR_VPLL, .ops = &db8500_regulator_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, }, [DB8500_REGULATOR_VSMPS1] = { .desc = { .name = "db8500-vsmps1", .id = DB8500_REGULATOR_VSMPS1, .ops = &db8500_regulator_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, }, [DB8500_REGULATOR_VSMPS2] = { .desc = { .name = "db8500-vsmps2", .id = DB8500_REGULATOR_VSMPS2, .ops = &db8500_regulator_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, .exclude_from_power_state = true, }, [DB8500_REGULATOR_VSMPS3] = { .desc = { .name = "db8500-vsmps3", .id = DB8500_REGULATOR_VSMPS3, .ops = &db8500_regulator_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, }, [DB8500_REGULATOR_VRF1] = { .desc = { .name = "db8500-vrf1", .id = DB8500_REGULATOR_VRF1, .ops = &db8500_regulator_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, }, [DB8500_REGULATOR_SWITCH_SVAMMDSP] = { .desc = { .name = "db8500-sva-mmdsp", .id = DB8500_REGULATOR_SWITCH_SVAMMDSP, .ops = &db8500_regulator_switch_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, .epod_id = EPOD_ID_SVAMMDSP, }, [DB8500_REGULATOR_SWITCH_SVAMMDSPRET] = { .desc = { .name = "db8500-sva-mmdsp-ret", .id = DB8500_REGULATOR_SWITCH_SVAMMDSPRET, .ops = &db8500_regulator_switch_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, .epod_id = EPOD_ID_SVAMMDSP, .is_ramret = true, }, [DB8500_REGULATOR_SWITCH_SVAPIPE] = { .desc = { .name = "db8500-sva-pipe", .id = DB8500_REGULATOR_SWITCH_SVAPIPE, .ops = &db8500_regulator_switch_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, .epod_id = EPOD_ID_SVAPIPE, }, [DB8500_REGULATOR_SWITCH_SIAMMDSP] = { .desc = { .name = "db8500-sia-mmdsp", .id = DB8500_REGULATOR_SWITCH_SIAMMDSP, .ops = &db8500_regulator_switch_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, .epod_id = EPOD_ID_SIAMMDSP, }, [DB8500_REGULATOR_SWITCH_SIAMMDSPRET] = { .desc = { .name = "db8500-sia-mmdsp-ret", .id = DB8500_REGULATOR_SWITCH_SIAMMDSPRET, .ops = &db8500_regulator_switch_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, .epod_id = EPOD_ID_SIAMMDSP, .is_ramret = true, }, [DB8500_REGULATOR_SWITCH_SIAPIPE] = { .desc = { .name = "db8500-sia-pipe", .id = DB8500_REGULATOR_SWITCH_SIAPIPE, .ops = &db8500_regulator_switch_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, .epod_id = EPOD_ID_SIAPIPE, }, [DB8500_REGULATOR_SWITCH_SGA] = { .desc = { .name = "db8500-sga", .id = DB8500_REGULATOR_SWITCH_SGA, .ops = &db8500_regulator_switch_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, .epod_id = EPOD_ID_SGA, }, [DB8500_REGULATOR_SWITCH_B2R2_MCDE] = { .desc = { .name = "db8500-b2r2-mcde", .id = DB8500_REGULATOR_SWITCH_B2R2_MCDE, .ops = &db8500_regulator_switch_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, .epod_id = EPOD_ID_B2R2_MCDE, }, [DB8500_REGULATOR_SWITCH_ESRAM12] = { .desc = { .name = "db8500-esram12", .id = DB8500_REGULATOR_SWITCH_ESRAM12, .ops = &db8500_regulator_switch_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, .epod_id = EPOD_ID_ESRAM12, .is_enabled = true, }, [DB8500_REGULATOR_SWITCH_ESRAM12RET] = { .desc = { .name = "db8500-esram12-ret", .id = DB8500_REGULATOR_SWITCH_ESRAM12RET, .ops = &db8500_regulator_switch_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, .epod_id = EPOD_ID_ESRAM12, .is_ramret = true, }, [DB8500_REGULATOR_SWITCH_ESRAM34] = { .desc = { .name = "db8500-esram34", .id = DB8500_REGULATOR_SWITCH_ESRAM34, .ops = &db8500_regulator_switch_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, .epod_id = EPOD_ID_ESRAM34, .is_enabled = true, }, [DB8500_REGULATOR_SWITCH_ESRAM34RET] = { .desc = { .name = "db8500-esram34-ret", .id = DB8500_REGULATOR_SWITCH_ESRAM34RET, .ops = &db8500_regulator_switch_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, .epod_id = EPOD_ID_ESRAM34, .is_ramret = true, }, }; static int __devinit db8500_regulator_probe(struct platform_device *pdev) { struct regulator_init_data *db8500_init_data = dev_get_platdata(&pdev->dev); int i, err; /* register all regulators */ for (i = 0; i < ARRAY_SIZE(db8500_regulator_info); i++) { struct db8500_regulator_info *info; struct regulator_init_data *init_data = &db8500_init_data[i]; /* assign per-regulator data */ info = &db8500_regulator_info[i]; info->dev = &pdev->dev; /* register with the regulator framework */ info->rdev = regulator_register(&info->desc, &pdev->dev, init_data, info); if (IS_ERR(info->rdev)) { err = PTR_ERR(info->rdev); dev_err(&pdev->dev, "failed to register %s: err %i\n", info->desc.name, err); /* if failing, unregister all earlier regulators */ while (--i >= 0) { info = &db8500_regulator_info[i]; regulator_unregister(info->rdev); } return err; } dev_dbg(rdev_get_dev(info->rdev), "regulator-%s-probed\n", info->desc.name); } return 0; } static int __exit db8500_regulator_remove(struct platform_device *pdev) { int i; for (i = 0; i < ARRAY_SIZE(db8500_regulator_info); i++) { struct db8500_regulator_info *info; info = &db8500_regulator_info[i]; dev_vdbg(rdev_get_dev(info->rdev), "regulator-%s-remove\n", info->desc.name); regulator_unregister(info->rdev); } return 0; } static struct platform_driver db8500_regulator_driver = { .driver = { .name = "db8500-prcmu-regulators", .owner = THIS_MODULE, }, .probe = db8500_regulator_probe, .remove = __exit_p(db8500_regulator_remove), }; static int __init db8500_regulator_init(void) { return platform_driver_register(&db8500_regulator_driver); } static void __exit db8500_regulator_exit(void) { platform_driver_unregister(&db8500_regulator_driver); } arch_initcall(db8500_regulator_init); module_exit(db8500_regulator_exit); MODULE_AUTHOR("STMicroelectronics/ST-Ericsson"); MODULE_DESCRIPTION("DB8500 regulator driver"); MODULE_LICENSE("GPL v2");