1 // SPDX-License-Identifier: GPL-2.0
21  * scp_ipi_register() - register an ipi function
26  * @priv:	private data for IPI handler
30  * Return: 0 if ipi registers successfully, -error on error.
38 		return -EPROBE_DEFER;  in scp_ipi_register()
41 		return -EINVAL;  in scp_ipi_register()
44 	scp->ipi_desc[id].handler = handler;  in scp_ipi_register()
45 	scp->ipi_desc[id].priv = priv;  in scp_ipi_register()
53  * scp_ipi_unregister() - unregister an ipi function
69 	scp->ipi_desc[id].handler = NULL;  in scp_ipi_unregister()
70 	scp->ipi_desc[id].priv = NULL;  in scp_ipi_unregister()
76  * scp_memcpy_aligned() - Copy src to dst, where dst is in SCP SRAM region.
82  * Since AP access of SCP SRAM don't support byte write, this always write a
94 		i = 4 - (dst - ptr);  in scp_memcpy_aligned()
96 		memcpy((u8 *)&val + (4 - i), src, i);  in scp_memcpy_aligned()
100 	__iowrite32_copy(dst + i, src + i, (len - i) / 4);  in scp_memcpy_aligned()
101 	remain = (len - i) % 4;  in scp_memcpy_aligned()
104 		val = readl_relaxed(dst + len - remain);  in scp_memcpy_aligned()
105 		memcpy(&val, src + len - remain, remain);  in scp_memcpy_aligned()
106 		writel_relaxed(val, dst + len - remain);  in scp_memcpy_aligned()
112  * scp_ipi_lock() - Lock before operations of an IPI ID
123 	mutex_lock(&scp->ipi_desc[id].lock);  in scp_ipi_lock()
128  * scp_ipi_unlock() - Unlock after operations of an IPI ID
139 	mutex_unlock(&scp->ipi_desc[id].lock);  in scp_ipi_unlock()
144  * scp_ipi_send() - send data from AP to scp.
150  * @wait:	number of msecs to wait for ack. 0 to skip waiting.
152  * This function is thread-safe. When this function returns,
157  * Return: 0 if sending data successfully, -error on error.
160 		 unsigned int wait)  in scp_ipi_send()  argument
162 	struct mtk_share_obj __iomem *send_obj = scp->send_buf;  in scp_ipi_send()
167 	scp_sizes = scp->data->scp_sizes;  in scp_ipi_send()
171 	    WARN_ON(len > scp_sizes->ipi_share_buffer_size) || WARN_ON(!buf))  in scp_ipi_send()
172 		return -EINVAL;  in scp_ipi_send()
174 	ret = clk_prepare_enable(scp->clk);  in scp_ipi_send()
176 		dev_err(scp->dev, "failed to enable clock\n");  in scp_ipi_send()
180 	mutex_lock(&scp->send_lock);  in scp_ipi_send()
182 	 /* Wait until SCP receives the last command */  in scp_ipi_send()
183 	ret = readl_poll_timeout_atomic(scp->cluster->reg_base + scp->data->host_to_scp_reg,  in scp_ipi_send()
186 		dev_err(scp->dev, "%s: IPI timeout!\n", __func__);  in scp_ipi_send()
190 	scp_memcpy_aligned(&send_obj->share_buf, buf, len);  in scp_ipi_send()
192 	writel(len, &send_obj->len);  in scp_ipi_send()
193 	writel(id, &send_obj->id);  in scp_ipi_send()
195 	scp->ipi_id_ack[id] = false;  in scp_ipi_send()
197 	writel(scp->data->host_to_scp_int_bit,  in scp_ipi_send()
198 	       scp->cluster->reg_base + scp->data->host_to_scp_reg);  in scp_ipi_send()
200 	if (wait) {  in scp_ipi_send()
201 		/* wait for SCP's ACK */  in scp_ipi_send()
202 		ret = wait_event_timeout(scp->ack_wq,  in scp_ipi_send()
203 					 scp->ipi_id_ack[id],  in scp_ipi_send()
204 					 msecs_to_jiffies(wait));  in scp_ipi_send()
205 		scp->ipi_id_ack[id] = false;  in scp_ipi_send()
206 		if (WARN(!ret, "scp ipi %d ack time out !", id))  in scp_ipi_send()
207 			ret = -EIO;  in scp_ipi_send()
213 	mutex_unlock(&scp->send_lock);  in scp_ipi_send()
214 	clk_disable_unprepare(scp->clk);  in scp_ipi_send()