| Hector Martin | 7466b6d | 2025-04-20 13:58:05 +0200 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0+ OR MIT |
| 2 | /* |
| 3 | * Copyright The Asahi Linux Contributors |
| 4 | */ |
| 5 | |
| 6 | #include <dm.h> |
| 7 | #include <mailbox.h> |
| 8 | #include <mapmem.h> |
| 9 | #include <reset.h> |
| 10 | |
| 11 | #include <asm/io.h> |
| 12 | #include <asm/arch/rtkit.h> |
| 13 | #include <linux/iopoll.h> |
| 14 | |
| 15 | /* ASC registers */ |
| 16 | #define REG_CPU_CTRL 0x0044 |
| 17 | #define REG_CPU_CTRL_RUN BIT(4) |
| 18 | |
| 19 | struct rtkit_helper_priv { |
| 20 | void *asc; /* ASC registers */ |
| 21 | struct mbox_chan chan; |
| 22 | struct apple_rtkit *rtk; |
| 23 | }; |
| 24 | |
| 25 | static int rtkit_helper_probe(struct udevice *dev) |
| 26 | { |
| 27 | struct rtkit_helper_priv *priv = dev_get_priv(dev); |
| 28 | u32 ctrl; |
| 29 | int ret; |
| 30 | |
| 31 | priv->asc = dev_read_addr_ptr(dev); |
| 32 | if (!priv->asc) |
| 33 | return -EINVAL; |
| 34 | |
| 35 | ret = mbox_get_by_index(dev, 0, &priv->chan); |
| 36 | if (ret < 0) |
| 37 | return ret; |
| 38 | |
| 39 | ctrl = readl(priv->asc + REG_CPU_CTRL); |
| 40 | writel(ctrl | REG_CPU_CTRL_RUN, priv->asc + REG_CPU_CTRL); |
| 41 | |
| 42 | priv->rtk = apple_rtkit_init(&priv->chan, priv, NULL, NULL); |
| 43 | if (!priv->rtk) |
| 44 | return -ENOMEM; |
| 45 | |
| 46 | ret = apple_rtkit_boot(priv->rtk); |
| 47 | if (ret < 0) { |
| 48 | printf("%s: Helper apple_rtkit_boot returned: %d\n", __func__, ret); |
| 49 | return ret; |
| 50 | } |
| 51 | |
| 52 | ret = apple_rtkit_set_ap_power(priv->rtk, APPLE_RTKIT_PWR_STATE_ON); |
| 53 | if (ret < 0) { |
| 54 | printf("%s: Helper apple_rtkit_set_ap_power returned: %d\n", __func__, ret); |
| 55 | return ret; |
| 56 | } |
| 57 | |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | static int rtkit_helper_remove(struct udevice *dev) |
| 62 | { |
| 63 | struct rtkit_helper_priv *priv = dev_get_priv(dev); |
| 64 | u32 ctrl; |
| 65 | |
| 66 | apple_rtkit_shutdown(priv->rtk, APPLE_RTKIT_PWR_STATE_QUIESCED); |
| 67 | |
| 68 | ctrl = readl(priv->asc + REG_CPU_CTRL); |
| 69 | writel(ctrl & ~REG_CPU_CTRL_RUN, priv->asc + REG_CPU_CTRL); |
| 70 | |
| 71 | apple_rtkit_free(priv->rtk); |
| 72 | priv->rtk = NULL; |
| 73 | |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | int apple_rtkit_helper_poll(struct udevice *dev, ulong timeout) |
| 78 | { |
| 79 | struct rtkit_helper_priv *priv = dev_get_priv(dev); |
| 80 | |
| 81 | return apple_rtkit_poll(priv->rtk, timeout); |
| 82 | } |
| 83 | |
| 84 | static const struct udevice_id rtkit_helper_ids[] = { |
| 85 | { .compatible = "apple,rtk-helper-asc4" }, |
| 86 | { /* sentinel */ } |
| 87 | }; |
| 88 | |
| 89 | U_BOOT_DRIVER(rtkit_helper) = { |
| 90 | .name = "rtkit_helper", |
| 91 | .id = UCLASS_MISC, |
| 92 | .of_match = rtkit_helper_ids, |
| 93 | .priv_auto = sizeof(struct rtkit_helper_priv), |
| 94 | .probe = rtkit_helper_probe, |
| 95 | .remove = rtkit_helper_remove, |
| 96 | .flags = DM_FLAG_OS_PREPARE, |
| 97 | }; |