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218 lines
5.2 KiB
218 lines
5.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// |
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// Copyright (c) 2019 MediaTek Inc. |
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#include <asm/barrier.h> |
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#include <linux/clk.h> |
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#include <linux/err.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/remoteproc/mtk_scp.h> |
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#include "mtk_common.h" |
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/** |
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* scp_ipi_register() - register an ipi function |
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* |
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* @scp: mtk_scp structure |
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* @id: IPI ID |
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* @handler: IPI handler |
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* @priv: private data for IPI handler |
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* |
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* Register an ipi function to receive ipi interrupt from SCP. |
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* |
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* Returns 0 if ipi registers successfully, -error on error. |
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*/ |
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int scp_ipi_register(struct mtk_scp *scp, |
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u32 id, |
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scp_ipi_handler_t handler, |
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void *priv) |
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{ |
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if (!scp) |
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return -EPROBE_DEFER; |
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if (WARN_ON(id >= SCP_IPI_MAX) || WARN_ON(handler == NULL)) |
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return -EINVAL; |
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scp_ipi_lock(scp, id); |
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scp->ipi_desc[id].handler = handler; |
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scp->ipi_desc[id].priv = priv; |
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scp_ipi_unlock(scp, id); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(scp_ipi_register); |
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/** |
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* scp_ipi_unregister() - unregister an ipi function |
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* |
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* @scp: mtk_scp structure |
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* @id: IPI ID |
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* |
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* Unregister an ipi function to receive ipi interrupt from SCP. |
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*/ |
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void scp_ipi_unregister(struct mtk_scp *scp, u32 id) |
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{ |
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if (!scp) |
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return; |
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if (WARN_ON(id >= SCP_IPI_MAX)) |
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return; |
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scp_ipi_lock(scp, id); |
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scp->ipi_desc[id].handler = NULL; |
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scp->ipi_desc[id].priv = NULL; |
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scp_ipi_unlock(scp, id); |
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} |
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EXPORT_SYMBOL_GPL(scp_ipi_unregister); |
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/* |
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* scp_memcpy_aligned() - Copy src to dst, where dst is in SCP SRAM region. |
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* |
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* @dst: Pointer to the destination buffer, should be in SCP SRAM region. |
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* @src: Pointer to the source buffer. |
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* @len: Length of the source buffer to be copied. |
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* |
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* Since AP access of SCP SRAM don't support byte write, this always write a |
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* full word at a time, and may cause some extra bytes to be written at the |
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* beginning & ending of dst. |
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*/ |
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void scp_memcpy_aligned(void __iomem *dst, const void *src, unsigned int len) |
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{ |
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void __iomem *ptr; |
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u32 val; |
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unsigned int i = 0, remain; |
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if (!IS_ALIGNED((unsigned long)dst, 4)) { |
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ptr = (void __iomem *)ALIGN_DOWN((unsigned long)dst, 4); |
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i = 4 - (dst - ptr); |
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val = readl_relaxed(ptr); |
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memcpy((u8 *)&val + (4 - i), src, i); |
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writel_relaxed(val, ptr); |
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} |
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__iowrite32_copy(dst + i, src + i, (len - i) / 4); |
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remain = (len - i) % 4; |
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if (remain > 0) { |
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val = readl_relaxed(dst + len - remain); |
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memcpy(&val, src + len - remain, remain); |
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writel_relaxed(val, dst + len - remain); |
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} |
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} |
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EXPORT_SYMBOL_GPL(scp_memcpy_aligned); |
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/** |
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* scp_ipi_lock() - Lock before operations of an IPI ID |
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* |
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* @scp: mtk_scp structure |
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* @id: IPI ID |
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* |
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* Note: This should not be used by drivers other than mtk_scp. |
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*/ |
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void scp_ipi_lock(struct mtk_scp *scp, u32 id) |
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{ |
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if (WARN_ON(id >= SCP_IPI_MAX)) |
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return; |
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mutex_lock(&scp->ipi_desc[id].lock); |
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} |
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EXPORT_SYMBOL_GPL(scp_ipi_lock); |
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/** |
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* scp_ipi_lock() - Unlock after operations of an IPI ID |
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* |
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* @scp: mtk_scp structure |
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* @id: IPI ID |
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* |
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* Note: This should not be used by drivers other than mtk_scp. |
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*/ |
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void scp_ipi_unlock(struct mtk_scp *scp, u32 id) |
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{ |
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if (WARN_ON(id >= SCP_IPI_MAX)) |
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return; |
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mutex_unlock(&scp->ipi_desc[id].lock); |
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} |
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EXPORT_SYMBOL_GPL(scp_ipi_unlock); |
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/** |
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* scp_ipi_send() - send data from AP to scp. |
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* |
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* @scp: mtk_scp structure |
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* @id: IPI ID |
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* @buf: the data buffer |
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* @len: the data buffer length |
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* @wait: number of msecs to wait for ack. 0 to skip waiting. |
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* |
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* This function is thread-safe. When this function returns, |
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* SCP has received the data and starts the processing. |
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* When the processing completes, IPI handler registered |
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* by scp_ipi_register will be called in interrupt context. |
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* |
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* Returns 0 if sending data successfully, -error on error. |
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**/ |
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int scp_ipi_send(struct mtk_scp *scp, u32 id, void *buf, unsigned int len, |
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unsigned int wait) |
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{ |
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struct mtk_share_obj __iomem *send_obj = scp->send_buf; |
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unsigned long timeout; |
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int ret; |
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if (WARN_ON(id <= SCP_IPI_INIT) || WARN_ON(id >= SCP_IPI_MAX) || |
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WARN_ON(id == SCP_IPI_NS_SERVICE) || |
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WARN_ON(len > sizeof(send_obj->share_buf)) || WARN_ON(!buf)) |
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return -EINVAL; |
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mutex_lock(&scp->send_lock); |
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ret = clk_prepare_enable(scp->clk); |
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if (ret) { |
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dev_err(scp->dev, "failed to enable clock\n"); |
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goto unlock_mutex; |
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} |
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/* Wait until SCP receives the last command */ |
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timeout = jiffies + msecs_to_jiffies(2000); |
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do { |
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if (time_after(jiffies, timeout)) { |
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dev_err(scp->dev, "%s: IPI timeout!\n", __func__); |
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ret = -ETIMEDOUT; |
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goto clock_disable; |
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} |
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} while (readl(scp->reg_base + scp->data->host_to_scp_reg)); |
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scp_memcpy_aligned(send_obj->share_buf, buf, len); |
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writel(len, &send_obj->len); |
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writel(id, &send_obj->id); |
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scp->ipi_id_ack[id] = false; |
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/* send the command to SCP */ |
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writel(scp->data->host_to_scp_int_bit, |
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scp->reg_base + scp->data->host_to_scp_reg); |
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if (wait) { |
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/* wait for SCP's ACK */ |
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timeout = msecs_to_jiffies(wait); |
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ret = wait_event_timeout(scp->ack_wq, |
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scp->ipi_id_ack[id], |
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timeout); |
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scp->ipi_id_ack[id] = false; |
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if (WARN(!ret, "scp ipi %d ack time out !", id)) |
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ret = -EIO; |
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else |
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ret = 0; |
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} |
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clock_disable: |
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clk_disable_unprepare(scp->clk); |
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unlock_mutex: |
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mutex_unlock(&scp->send_lock); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(scp_ipi_send); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("MediaTek scp IPI interface");
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