1 // SPDX-License-Identifier: GPL-2.0
21  * scp_ipi_register() - register an ipi function
24  * @id:		IPI ID
25  * @handler:	IPI handler
26  * @priv:	private data for IPI handler
28  * Register an ipi function to receive ipi interrupt from SCP.
30  * Return: 0 if ipi registers successfully, -error on error.
33 		     u32 id,  in scp_ipi_register()  argument
38 		return -EPROBE_DEFER;  in scp_ipi_register()
40 	if (WARN_ON(id >= SCP_IPI_MAX) || WARN_ON(handler == NULL))  in scp_ipi_register()
41 		return -EINVAL;  in scp_ipi_register()
43 	scp_ipi_lock(scp, id);  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()
46 	scp_ipi_unlock(scp, id);  in scp_ipi_register()
53  * scp_ipi_unregister() - unregister an ipi function
56  * @id:		IPI ID
58  * Unregister an ipi function to receive ipi interrupt from SCP.
60 void scp_ipi_unregister(struct mtk_scp *scp, u32 id)  in scp_ipi_unregister()  argument
65 	if (WARN_ON(id >= SCP_IPI_MAX))  in scp_ipi_unregister()
68 	scp_ipi_lock(scp, id);  in scp_ipi_unregister()
69 	scp->ipi_desc[id].handler = NULL;  in scp_ipi_unregister()
70 	scp->ipi_desc[id].priv = NULL;  in scp_ipi_unregister()
71 	scp_ipi_unlock(scp, id);  in scp_ipi_unregister()
76  * scp_memcpy_aligned() - Copy src to dst, where dst is in SCP SRAM region.
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
115  * @id:		IPI ID
119 void scp_ipi_lock(struct mtk_scp *scp, u32 id)  in scp_ipi_lock()  argument
121 	if (WARN_ON(id >= SCP_IPI_MAX))  in scp_ipi_lock()
123 	mutex_lock(&scp->ipi_desc[id].lock);  in scp_ipi_lock()
128  * scp_ipi_unlock() - Unlock after operations of an IPI ID
131  * @id:		IPI ID
135 void scp_ipi_unlock(struct mtk_scp *scp, u32 id)  in scp_ipi_unlock()  argument
137 	if (WARN_ON(id >= SCP_IPI_MAX))  in scp_ipi_unlock()
139 	mutex_unlock(&scp->ipi_desc[id].lock);  in scp_ipi_unlock()
144  * scp_ipi_send() - send data from AP to scp.
147  * @id:		IPI ID
152  * This function is thread-safe. When this function returns,
154  * When the processing completes, IPI handler registered
157  * Return: 0 if sending data successfully, -error on error.
159 int scp_ipi_send(struct mtk_scp *scp, u32 id, void *buf, unsigned int len,  in scp_ipi_send()  argument
162 	struct mtk_share_obj __iomem *send_obj = scp->send_buf;  in scp_ipi_send()
166 	if (WARN_ON(id <= SCP_IPI_INIT) || WARN_ON(id >= SCP_IPI_MAX) ||  in scp_ipi_send()
167 	    WARN_ON(id == SCP_IPI_NS_SERVICE) ||  in scp_ipi_send()
168 	    WARN_ON(len > sizeof(send_obj->share_buf)) || WARN_ON(!buf))  in scp_ipi_send()
169 		return -EINVAL;  in scp_ipi_send()
171 	ret = clk_prepare_enable(scp->clk);  in scp_ipi_send()
173 		dev_err(scp->dev, "failed to enable clock\n");  in scp_ipi_send()
177 	mutex_lock(&scp->send_lock);  in scp_ipi_send()
180 	ret = readl_poll_timeout_atomic(scp->reg_base + scp->data->host_to_scp_reg,  in scp_ipi_send()
183 		dev_err(scp->dev, "%s: IPI timeout!\n", __func__);  in scp_ipi_send()
187 	scp_memcpy_aligned(send_obj->share_buf, buf, len);  in scp_ipi_send()
189 	writel(len, &send_obj->len);  in scp_ipi_send()
190 	writel(id, &send_obj->id);  in scp_ipi_send()
192 	scp->ipi_id_ack[id] = false;  in scp_ipi_send()
194 	writel(scp->data->host_to_scp_int_bit,  in scp_ipi_send()
195 	       scp->reg_base + scp->data->host_to_scp_reg);  in scp_ipi_send()
199 		ret = wait_event_timeout(scp->ack_wq,  in scp_ipi_send()
200 					 scp->ipi_id_ack[id],  in scp_ipi_send()
202 		scp->ipi_id_ack[id] = false;  in scp_ipi_send()
203 		if (WARN(!ret, "scp ipi %d ack time out !", id))  in scp_ipi_send()
204 			ret = -EIO;  in scp_ipi_send()
210 	mutex_unlock(&scp->send_lock);  in scp_ipi_send()
211 	clk_disable_unprepare(scp->clk);  in scp_ipi_send()
218 MODULE_DESCRIPTION("MediaTek scp IPI interface");