| Andreas Dannenberg | 24c6e91 | 2018-08-27 15:57:45 +0530 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Texas Instruments System Control Interface (TI SCI) power domain driver |
| 4 | * |
| 5 | * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ |
| 6 | * Andreas Dannenberg <dannenberg@ti.com> |
| 7 | * |
| 8 | * Loosely based on Linux kernel ti_sci_pm_domains.c... |
| 9 | */ |
| 10 | |
| 11 | #include <common.h> |
| 12 | #include <dm.h> |
| 13 | #include <errno.h> |
| 14 | #include <power-domain-uclass.h> |
| 15 | #include <linux/soc/ti/ti_sci_protocol.h> |
| 16 | |
| 17 | /** |
| 18 | * struct ti_sci_power_domain_data - pm domain controller information structure |
| 19 | * @sci: TI SCI handle used for communication with system controller |
| 20 | */ |
| 21 | struct ti_sci_power_domain_data { |
| 22 | const struct ti_sci_handle *sci; |
| 23 | }; |
| 24 | |
| 25 | static int ti_sci_power_domain_probe(struct udevice *dev) |
| 26 | { |
| 27 | struct ti_sci_power_domain_data *data = dev_get_priv(dev); |
| 28 | |
| 29 | debug("%s(dev=%p)\n", __func__, dev); |
| 30 | |
| 31 | if (!data) |
| 32 | return -ENOMEM; |
| 33 | |
| 34 | /* Store handle for communication with the system controller */ |
| 35 | data->sci = ti_sci_get_handle(dev); |
| 36 | if (IS_ERR(data->sci)) |
| 37 | return PTR_ERR(data->sci); |
| 38 | |
| 39 | return 0; |
| 40 | } |
| 41 | |
| 42 | static int ti_sci_power_domain_request(struct power_domain *pd) |
| 43 | { |
| 44 | debug("%s(pd=%p)\n", __func__, pd); |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | static int ti_sci_power_domain_free(struct power_domain *pd) |
| 49 | { |
| 50 | debug("%s(pd=%p)\n", __func__, pd); |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | static int ti_sci_power_domain_on(struct power_domain *pd) |
| 55 | { |
| 56 | struct ti_sci_power_domain_data *data = dev_get_priv(pd->dev); |
| 57 | const struct ti_sci_handle *sci = data->sci; |
| 58 | const struct ti_sci_dev_ops *dops = &sci->ops.dev_ops; |
| 59 | int ret; |
| 60 | |
| 61 | debug("%s(pd=%p)\n", __func__, pd); |
| 62 | |
| 63 | ret = dops->get_device(sci, pd->id); |
| 64 | if (ret) |
| 65 | dev_err(power_domain->dev, "%s: get_device failed (%d)\n", |
| 66 | __func__, ret); |
| 67 | |
| 68 | return ret; |
| 69 | } |
| 70 | |
| 71 | static int ti_sci_power_domain_off(struct power_domain *pd) |
| 72 | { |
| 73 | struct ti_sci_power_domain_data *data = dev_get_priv(pd->dev); |
| 74 | const struct ti_sci_handle *sci = data->sci; |
| 75 | const struct ti_sci_dev_ops *dops = &sci->ops.dev_ops; |
| 76 | int ret; |
| 77 | |
| 78 | debug("%s(pd=%p)\n", __func__, pd); |
| 79 | |
| 80 | ret = dops->put_device(sci, pd->id); |
| 81 | if (ret) |
| 82 | dev_err(power_domain->dev, "%s: put_device failed (%d)\n", |
| 83 | __func__, ret); |
| 84 | |
| 85 | return ret; |
| 86 | } |
| 87 | |
| 88 | static const struct udevice_id ti_sci_power_domain_of_match[] = { |
| 89 | { .compatible = "ti,sci-pm-domain" }, |
| 90 | { /* sentinel */ } |
| 91 | }; |
| 92 | |
| 93 | static struct power_domain_ops ti_sci_power_domain_ops = { |
| 94 | .request = ti_sci_power_domain_request, |
| 95 | .free = ti_sci_power_domain_free, |
| 96 | .on = ti_sci_power_domain_on, |
| 97 | .off = ti_sci_power_domain_off, |
| 98 | }; |
| 99 | |
| 100 | U_BOOT_DRIVER(ti_sci_pm_domains) = { |
| 101 | .name = "ti-sci-pm-domains", |
| 102 | .id = UCLASS_POWER_DOMAIN, |
| 103 | .of_match = ti_sci_power_domain_of_match, |
| 104 | .probe = ti_sci_power_domain_probe, |
| 105 | .priv_auto_alloc_size = sizeof(struct ti_sci_power_domain_data), |
| 106 | .ops = &ti_sci_power_domain_ops, |
| 107 | }; |