1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) 2 // 3 // This file is provided under a dual BSD/GPLv2 license. When using or 4 // redistributing this file, you may do so under either license. 5 // 6 // Copyright(c) 2021 Advanced Micro Devices, Inc. 7 // 8 // Authors: Balakishore Pati <Balakishore.pati@amd.com> 9 // Ajit Kumar Pandey <AjitKumar.Pandey@amd.com> 10 11 /* ACP-specific SOF IPC code */ 12 13 #include <linux/module.h> 14 #include "../ops.h" 15 #include "acp.h" 16 #include "acp-dsp-offset.h" 17 18 void acp_mailbox_write(struct snd_sof_dev *sdev, u32 offset, void *message, size_t bytes) 19 { 20 memcpy_to_scratch(sdev, offset, message, bytes); 21 } 22 EXPORT_SYMBOL_NS(acp_mailbox_write, SND_SOC_SOF_AMD_COMMON); 23 24 void acp_mailbox_read(struct snd_sof_dev *sdev, u32 offset, void *message, size_t bytes) 25 { 26 memcpy_from_scratch(sdev, offset, message, bytes); 27 } 28 EXPORT_SYMBOL_NS(acp_mailbox_read, SND_SOC_SOF_AMD_COMMON); 29 30 static void acpbus_trigger_host_to_dsp_swintr(struct acp_dev_data *adata) 31 { 32 struct snd_sof_dev *sdev = adata->dev; 33 const struct sof_amd_acp_desc *desc = get_chip_info(sdev->pdata); 34 u32 swintr_trigger; 35 36 swintr_trigger = snd_sof_dsp_read(sdev, ACP_DSP_BAR, desc->dsp_intr_base + 37 DSP_SW_INTR_TRIG_OFFSET); 38 swintr_trigger |= 0x01; 39 snd_sof_dsp_write(sdev, ACP_DSP_BAR, desc->dsp_intr_base + DSP_SW_INTR_TRIG_OFFSET, 40 swintr_trigger); 41 } 42 43 static void acp_ipc_host_msg_set(struct snd_sof_dev *sdev) 44 { 45 unsigned int host_msg = sdev->debug_box.offset + 46 offsetof(struct scratch_ipc_conf, sof_host_msg_write); 47 48 snd_sof_dsp_write(sdev, ACP_DSP_BAR, ACP_SCRATCH_REG_0 + host_msg, 1); 49 } 50 51 static void acp_dsp_ipc_host_done(struct snd_sof_dev *sdev) 52 { 53 unsigned int dsp_msg = sdev->debug_box.offset + 54 offsetof(struct scratch_ipc_conf, sof_dsp_msg_write); 55 56 snd_sof_dsp_write(sdev, ACP_DSP_BAR, ACP_SCRATCH_REG_0 + dsp_msg, 0); 57 } 58 59 static void acp_dsp_ipc_dsp_done(struct snd_sof_dev *sdev) 60 { 61 unsigned int dsp_ack = sdev->debug_box.offset + 62 offsetof(struct scratch_ipc_conf, sof_dsp_ack_write); 63 64 snd_sof_dsp_write(sdev, ACP_DSP_BAR, ACP_SCRATCH_REG_0 + dsp_ack, 0); 65 } 66 67 int acp_sof_ipc_send_msg(struct snd_sof_dev *sdev, struct snd_sof_ipc_msg *msg) 68 { 69 struct acp_dev_data *adata = sdev->pdata->hw_pdata; 70 const struct sof_amd_acp_desc *desc = get_chip_info(sdev->pdata); 71 unsigned int offset = sdev->host_box.offset; 72 unsigned int count = ACP_HW_SEM_RETRY_COUNT; 73 74 while (snd_sof_dsp_read(sdev, ACP_DSP_BAR, desc->hw_semaphore_offset)) { 75 /* Wait until acquired HW Semaphore Lock or timeout*/ 76 count--; 77 if (!count) { 78 dev_err(sdev->dev, "%s: Failed to acquire HW lock\n", __func__); 79 return -EINVAL; 80 } 81 } 82 83 acp_mailbox_write(sdev, offset, msg->msg_data, msg->msg_size); 84 acp_ipc_host_msg_set(sdev); 85 86 /* Trigger host to dsp interrupt for the msg */ 87 acpbus_trigger_host_to_dsp_swintr(adata); 88 89 /* Unlock or Release HW Semaphore */ 90 snd_sof_dsp_write(sdev, ACP_DSP_BAR, desc->hw_semaphore_offset, 0x0); 91 92 return 0; 93 } 94 EXPORT_SYMBOL_NS(acp_sof_ipc_send_msg, SND_SOC_SOF_AMD_COMMON); 95 96 static void acp_dsp_ipc_get_reply(struct snd_sof_dev *sdev) 97 { 98 struct snd_sof_ipc_msg *msg = sdev->msg; 99 struct sof_ipc_reply reply; 100 struct sof_ipc_cmd_hdr *hdr; 101 unsigned int offset = sdev->host_box.offset; 102 int ret = 0; 103 104 /* 105 * Sometimes, there is unexpected reply ipc arriving. The reply 106 * ipc belongs to none of the ipcs sent from driver. 107 * In this case, the driver must ignore the ipc. 108 */ 109 if (!msg) { 110 dev_warn(sdev->dev, "unexpected ipc interrupt raised!\n"); 111 return; 112 } 113 hdr = msg->msg_data; 114 if (hdr->cmd == (SOF_IPC_GLB_PM_MSG | SOF_IPC_PM_CTX_SAVE) || 115 hdr->cmd == (SOF_IPC_GLB_PM_MSG | SOF_IPC_PM_GATE)) { 116 /* 117 * memory windows are powered off before sending IPC reply, 118 * so we can't read the mailbox for CTX_SAVE and PM_GATE 119 * replies. 120 */ 121 reply.error = 0; 122 reply.hdr.cmd = SOF_IPC_GLB_REPLY; 123 reply.hdr.size = sizeof(reply); 124 memcpy(msg->reply_data, &reply, sizeof(reply)); 125 goto out; 126 } 127 /* get IPC reply from DSP in the mailbox */ 128 acp_mailbox_read(sdev, offset, &reply, sizeof(reply)); 129 if (reply.error < 0) { 130 memcpy(msg->reply_data, &reply, sizeof(reply)); 131 ret = reply.error; 132 } else { 133 /* reply correct size ? */ 134 if (reply.hdr.size != msg->reply_size && 135 !(reply.hdr.cmd & SOF_IPC_GLB_PROBE)) { 136 dev_err(sdev->dev, "reply expected %zu got %u bytes\n", 137 msg->reply_size, reply.hdr.size); 138 ret = -EINVAL; 139 } 140 /* read the message */ 141 if (msg->reply_size > 0) 142 acp_mailbox_read(sdev, offset, msg->reply_data, msg->reply_size); 143 } 144 out: 145 msg->reply_error = ret; 146 } 147 148 irqreturn_t acp_sof_ipc_irq_thread(int irq, void *context) 149 { 150 struct snd_sof_dev *sdev = context; 151 unsigned int dsp_msg_write = sdev->debug_box.offset + 152 offsetof(struct scratch_ipc_conf, sof_dsp_msg_write); 153 unsigned int dsp_ack_write = sdev->debug_box.offset + 154 offsetof(struct scratch_ipc_conf, sof_dsp_ack_write); 155 bool ipc_irq = false; 156 int dsp_msg, dsp_ack; 157 158 if (sdev->first_boot && sdev->fw_state != SOF_FW_BOOT_COMPLETE) { 159 snd_sof_ipc_msgs_rx(sdev); 160 acp_dsp_ipc_host_done(sdev); 161 return IRQ_HANDLED; 162 } 163 164 dsp_msg = snd_sof_dsp_read(sdev, ACP_DSP_BAR, ACP_SCRATCH_REG_0 + dsp_msg_write); 165 if (dsp_msg) { 166 snd_sof_ipc_msgs_rx(sdev); 167 acp_dsp_ipc_host_done(sdev); 168 ipc_irq = true; 169 } 170 171 dsp_ack = snd_sof_dsp_read(sdev, ACP_DSP_BAR, ACP_SCRATCH_REG_0 + dsp_ack_write); 172 if (dsp_ack) { 173 spin_lock_irq(&sdev->ipc_lock); 174 /* handle immediate reply from DSP core */ 175 acp_dsp_ipc_get_reply(sdev); 176 snd_sof_ipc_reply(sdev, 0); 177 /* set the done bit */ 178 acp_dsp_ipc_dsp_done(sdev); 179 spin_unlock_irq(&sdev->ipc_lock); 180 ipc_irq = true; 181 } 182 183 if (!ipc_irq) 184 dev_dbg_ratelimited(sdev->dev, "nothing to do in IPC IRQ thread\n"); 185 186 return IRQ_HANDLED; 187 } 188 EXPORT_SYMBOL_NS(acp_sof_ipc_irq_thread, SND_SOC_SOF_AMD_COMMON); 189 190 int acp_sof_ipc_msg_data(struct snd_sof_dev *sdev, struct snd_pcm_substream *substream, 191 void *p, size_t sz) 192 { 193 unsigned int offset = sdev->dsp_box.offset; 194 195 if (!substream || !sdev->stream_box.size) 196 acp_mailbox_read(sdev, offset, p, sz); 197 198 return 0; 199 } 200 EXPORT_SYMBOL_NS(acp_sof_ipc_msg_data, SND_SOC_SOF_AMD_COMMON); 201 202 int acp_sof_ipc_get_mailbox_offset(struct snd_sof_dev *sdev) 203 { 204 const struct sof_amd_acp_desc *desc = get_chip_info(sdev->pdata); 205 206 return desc->sram_pte_offset; 207 } 208 EXPORT_SYMBOL_NS(acp_sof_ipc_get_mailbox_offset, SND_SOC_SOF_AMD_COMMON); 209 210 int acp_sof_ipc_get_window_offset(struct snd_sof_dev *sdev, u32 id) 211 { 212 return 0; 213 } 214 EXPORT_SYMBOL_NS(acp_sof_ipc_get_window_offset, SND_SOC_SOF_AMD_COMMON); 215 216 MODULE_DESCRIPTION("AMD ACP sof-ipc driver"); 217