Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 1 | /* |
Wendy Liang | c31c48b | 2019-01-21 13:45:48 +0530 | [diff] [blame] | 2 | * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved. |
Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | /* |
| 8 | * Top-level SMC handler for ZynqMP IPI Mailbox doorbell functions. |
| 9 | */ |
| 10 | |
Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 11 | #include <errno.h> |
Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 12 | #include <string.h> |
Antonio Nino Diaz | e0f9063 | 2018-12-14 00:18:21 +0000 | [diff] [blame] | 13 | |
| 14 | #include <common/debug.h> |
| 15 | #include <common/runtime_svc.h> |
| 16 | #include <lib/bakery_lock.h> |
| 17 | #include <lib/mmio.h> |
Jolly Shah | c2583ab | 2019-01-08 11:31:49 -0800 | [diff] [blame] | 18 | |
| 19 | #include <ipi.h> |
Jolly Shah | 4c17237 | 2019-01-08 11:21:29 -0800 | [diff] [blame] | 20 | #include <plat_ipi.h> |
Jolly Shah | 0bfd700 | 2019-01-08 11:10:47 -0800 | [diff] [blame] | 21 | #include <plat_private.h> |
Antonio Nino Diaz | e0f9063 | 2018-12-14 00:18:21 +0000 | [diff] [blame] | 22 | |
Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 23 | #include "ipi_mailbox_svc.h" |
Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 24 | |
| 25 | /********************************************************************* |
| 26 | * Macros definitions |
| 27 | ********************************************************************/ |
| 28 | |
| 29 | /* IPI SMC calls macros: */ |
| 30 | #define IPI_SMC_OPEN_IRQ_MASK 0x00000001U /* IRQ enable bit in IPI |
| 31 | * open SMC call |
| 32 | */ |
| 33 | #define IPI_SMC_NOTIFY_BLOCK_MASK 0x00000001U /* Flag to indicate if |
| 34 | * IPI notification needs |
| 35 | * to be blocking. |
| 36 | */ |
| 37 | #define IPI_SMC_ENQUIRY_DIRQ_MASK 0x00000001U /* Flag to indicate if |
| 38 | * notification interrupt |
| 39 | * to be disabled. |
| 40 | */ |
| 41 | #define IPI_SMC_ACK_EIRQ_MASK 0x00000001U /* Flag to indicate if |
| 42 | * notification interrupt |
| 43 | * to be enable. |
| 44 | */ |
| 45 | |
| 46 | #define UNSIGNED32_MASK 0xFFFFFFFFU /* 32bit mask */ |
| 47 | |
| 48 | /** |
| 49 | * ipi_smc_handler() - SMC handler for IPI SMC calls |
| 50 | * |
| 51 | * @smc_fid - Function identifier |
| 52 | * @x1 - x4 - Arguments |
| 53 | * @cookie - Unused |
| 54 | * @handler - Pointer to caller's context structure |
| 55 | * |
| 56 | * @return - Unused |
| 57 | * |
| 58 | * Determines that smc_fid is valid and supported PM SMC Function ID from the |
| 59 | * list of pm_api_ids, otherwise completes the request with |
| 60 | * the unknown SMC Function ID |
| 61 | * |
| 62 | * The SMC calls for PM service are forwarded from SIP Service SMC handler |
| 63 | * function with rt_svc_handle signature |
| 64 | */ |
| 65 | uint64_t ipi_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2, |
Venkatesh Yadav Abbarapu | d3c0eb4 | 2022-05-24 14:02:52 +0530 | [diff] [blame] | 66 | uint64_t x3, uint64_t x4, const void *cookie, |
Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 67 | void *handle, uint64_t flags) |
| 68 | { |
Venkatesh Yadav Abbarapu | e7c4538 | 2022-05-19 14:49:49 +0530 | [diff] [blame] | 69 | int32_t ret; |
Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 70 | uint32_t ipi_local_id; |
| 71 | uint32_t ipi_remote_id; |
Venkatesh Yadav Abbarapu | e7c4538 | 2022-05-19 14:49:49 +0530 | [diff] [blame] | 72 | uint32_t is_secure; |
Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 73 | |
| 74 | ipi_local_id = x1 & UNSIGNED32_MASK; |
| 75 | ipi_remote_id = x2 & UNSIGNED32_MASK; |
| 76 | |
Akshay Belsare | ac45dbf | 2022-12-15 15:56:23 +0530 | [diff] [blame] | 77 | /* OEN Number 48 to 63 is for Trusted App and OS |
| 78 | * GET_SMC_OEN limits the return value of OEN number to 63 by bitwise |
| 79 | * AND operation with 0x3F. |
| 80 | * Upper limit check for OEN value is not required. |
| 81 | */ |
| 82 | if (GET_SMC_OEN(smc_fid) >= OEN_TAP_START) { |
Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 83 | is_secure = 1; |
Akshay Belsare | 6435ca0 | 2022-12-12 12:13:14 +0530 | [diff] [blame] | 84 | } else { |
Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 85 | is_secure = 0; |
Akshay Belsare | 6435ca0 | 2022-12-12 12:13:14 +0530 | [diff] [blame] | 86 | } |
Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 87 | |
| 88 | /* Validate IPI mailbox access */ |
| 89 | ret = ipi_mb_validate(ipi_local_id, ipi_remote_id, is_secure); |
| 90 | if (ret) |
| 91 | SMC_RET1(handle, ret); |
| 92 | |
Akshay Belsare | 6435ca0 | 2022-12-12 12:13:14 +0530 | [diff] [blame] | 93 | switch (GET_SMC_NUM(smc_fid)) { |
Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 94 | case IPI_MAILBOX_OPEN: |
| 95 | ipi_mb_open(ipi_local_id, ipi_remote_id); |
| 96 | SMC_RET1(handle, 0); |
| 97 | case IPI_MAILBOX_RELEASE: |
| 98 | ipi_mb_release(ipi_local_id, ipi_remote_id); |
| 99 | SMC_RET1(handle, 0); |
| 100 | case IPI_MAILBOX_STATUS_ENQUIRY: |
| 101 | { |
Venkatesh Yadav Abbarapu | e7c4538 | 2022-05-19 14:49:49 +0530 | [diff] [blame] | 102 | int32_t disable_irq; |
Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 103 | |
| 104 | disable_irq = (x3 & IPI_SMC_ENQUIRY_DIRQ_MASK) ? 1 : 0; |
| 105 | ret = ipi_mb_enquire_status(ipi_local_id, ipi_remote_id); |
| 106 | if ((ret & IPI_MB_STATUS_RECV_PENDING) && disable_irq) |
| 107 | ipi_mb_disable_irq(ipi_local_id, ipi_remote_id); |
| 108 | SMC_RET1(handle, ret); |
| 109 | } |
| 110 | case IPI_MAILBOX_NOTIFY: |
| 111 | { |
| 112 | uint32_t is_blocking; |
| 113 | |
| 114 | is_blocking = (x3 & IPI_SMC_NOTIFY_BLOCK_MASK) ? 1 : 0; |
Venkatesh Yadav Abbarapu | efa1d32 | 2021-08-04 21:33:15 -0600 | [diff] [blame] | 115 | ipi_mb_notify(ipi_local_id, ipi_remote_id, is_blocking); |
| 116 | SMC_RET1(handle, 0); |
Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 117 | } |
| 118 | case IPI_MAILBOX_ACK: |
| 119 | { |
Venkatesh Yadav Abbarapu | e7c4538 | 2022-05-19 14:49:49 +0530 | [diff] [blame] | 120 | int32_t enable_irq; |
Wendy Liang | f8fec36 | 2017-09-06 09:39:55 -0700 | [diff] [blame] | 121 | |
| 122 | enable_irq = (x3 & IPI_SMC_ACK_EIRQ_MASK) ? 1 : 0; |
| 123 | ipi_mb_ack(ipi_local_id, ipi_remote_id); |
| 124 | if (enable_irq) |
| 125 | ipi_mb_enable_irq(ipi_local_id, ipi_remote_id); |
| 126 | SMC_RET1(handle, 0); |
| 127 | } |
| 128 | case IPI_MAILBOX_ENABLE_IRQ: |
| 129 | ipi_mb_enable_irq(ipi_local_id, ipi_remote_id); |
| 130 | SMC_RET1(handle, 0); |
| 131 | case IPI_MAILBOX_DISABLE_IRQ: |
| 132 | ipi_mb_disable_irq(ipi_local_id, ipi_remote_id); |
| 133 | SMC_RET1(handle, 0); |
| 134 | default: |
| 135 | WARN("Unimplemented IPI service call: 0x%x\n", smc_fid); |
| 136 | SMC_RET1(handle, SMC_UNK); |
| 137 | } |
| 138 | } |