Commit 3efa0ea7 authored by Tzung-Bi Shih's avatar Tzung-Bi Shih Committed by Bjorn Andersson
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remoteproc/mediatek: read IPI buffer offset from FW 



Reads the IPI buffer offset from the FW binary.  The information resides
in addr of .ipi_buffer section.

Moves scp_ipi_init() to rproc_ops::parse_fw() phase.  The IPI buffer can
be initialized only if the offset is clear.

To backward compatible to MT8183 SCP, specify the offset in the board
specific mtk_scp_of_data.  Reads the default offset if the firmware
doesn't have it.

Reviewed-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: default avatarTzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20201202044609.2501913-1-tzungbi@google.com


Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
parent 22c3df6f

drivers/remoteproc/mtk_common.h

+2 −0
Original line number Diff line number Diff line
@@ -78,6 +78,8 @@ struct mtk_scp_of_data { 


	u32 host_to_scp_reg;

	u32 host_to_scp_int_bit;



	size_t ipi_buf_offset;

};



struct mtk_scp {

drivers/remoteproc/mtk_scp.c

+67 −22
Original line number Diff line number Diff line
@@ -21,7 +21,7 @@ 
#include "remoteproc_internal.h"



#define MAX_CODE_SIZE 0x500000

#define SCP_FW_END 0x7C000

#define SECTION_NAME_IPI_BUFFER ".ipi_buffer"



/**

 * scp_get() - get a reference to SCP.
@@ -119,16 +119,29 @@ static void scp_ipi_handler(struct mtk_scp *scp) 
	wake_up(&scp->ack_wq);

}



static int scp_ipi_init(struct mtk_scp *scp)

static int scp_elf_read_ipi_buf_addr(struct mtk_scp *scp,

				     const struct firmware *fw,

				     size_t *offset);



static int scp_ipi_init(struct mtk_scp *scp, const struct firmware *fw)

{

	size_t send_offset = SCP_FW_END - sizeof(struct mtk_share_obj);

	size_t recv_offset = send_offset - sizeof(struct mtk_share_obj);

	int ret;

	size_t offset;



	/* read the ipi buf addr from FW itself first */

	ret = scp_elf_read_ipi_buf_addr(scp, fw, &offset);

	if (ret) {

		/* use default ipi buf addr if the FW doesn't have it */

		offset = scp->data->ipi_buf_offset;

		if (!offset)

			return ret;

	}

	dev_info(scp->dev, "IPI buf addr %#010zx\n", offset);



	/* shared buffer initialization */

	scp->recv_buf =

		(struct mtk_share_obj __iomem *)(scp->sram_base + recv_offset);

	scp->send_buf =

		(struct mtk_share_obj __iomem *)(scp->sram_base + send_offset);

	scp->recv_buf = (struct mtk_share_obj __iomem *)

			(scp->sram_base + offset);

	scp->send_buf = (struct mtk_share_obj __iomem *)

			(scp->sram_base + offset + sizeof(*scp->recv_buf));

	memset_io(scp->recv_buf, 0, sizeof(*scp->recv_buf));

	memset_io(scp->send_buf, 0, sizeof(*scp->send_buf));
@@ -271,6 +284,32 @@ static int scp_elf_load_segments(struct rproc *rproc, const struct firmware *fw) 
	return ret;

}



static int scp_elf_read_ipi_buf_addr(struct mtk_scp *scp,

				     const struct firmware *fw,

				     size_t *offset)

{

	struct elf32_hdr *ehdr;

	struct elf32_shdr *shdr, *shdr_strtab;

	int i;

	const u8 *elf_data = fw->data;

	const char *strtab;



	ehdr = (struct elf32_hdr *)elf_data;

	shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff);

	shdr_strtab = shdr + ehdr->e_shstrndx;

	strtab = (const char *)(elf_data + shdr_strtab->sh_offset);



	for (i = 0; i < ehdr->e_shnum; i++, shdr++) {

		if (strcmp(strtab + shdr->sh_name,

			   SECTION_NAME_IPI_BUFFER) == 0) {

			*offset = shdr->sh_addr;

			return 0;

		}

	}



	return -ENOENT;

}



static int mt8183_scp_before_load(struct mtk_scp *scp)

{

	/* Clear SCP to host interrupt */
@@ -359,6 +398,23 @@ leave: 
	return ret;

}



static int scp_parse_fw(struct rproc *rproc, const struct firmware *fw)

{

	struct mtk_scp *scp = rproc->priv;

	struct device *dev = scp->dev;

	int ret;



	ret = clk_prepare_enable(scp->clk);

	if (ret) {

		dev_err(dev, "failed to enable clocks\n");

		return ret;

	}



	ret = scp_ipi_init(scp, fw);

	clk_disable_unprepare(scp->clk);

	return ret;

}



static int scp_start(struct rproc *rproc)

{

	struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
@@ -462,6 +518,7 @@ static const struct rproc_ops scp_ops = { 
	.stop		= scp_stop,

	.load		= scp_load,

	.da_to_va	= scp_da_to_va,

	.parse_fw	= scp_parse_fw,

};



/**
@@ -681,19 +738,6 @@ static int scp_probe(struct platform_device *pdev) 
		goto release_dev_mem;

	}



	ret = clk_prepare_enable(scp->clk);

	if (ret) {

		dev_err(dev, "failed to enable clocks\n");

		goto release_dev_mem;

	}



	ret = scp_ipi_init(scp);

	clk_disable_unprepare(scp->clk);

	if (ret) {

		dev_err(dev, "Failed to init ipi\n");

		goto release_dev_mem;

	}



	/* register SCP initialization IPI */

	ret = scp_ipi_register(scp, SCP_IPI_INIT, scp_init_ipi_handler, scp);

	if (ret) {
@@ -761,6 +805,7 @@ static const struct mtk_scp_of_data mt8183_of_data = { 
	.scp_stop = mt8183_scp_stop,

	.host_to_scp_reg = MT8183_HOST_TO_SCP,

	.host_to_scp_int_bit = MT8183_HOST_IPC_INT_BIT,

	.ipi_buf_offset = 0x7bdb0,

};



static const struct mtk_scp_of_data mt8192_of_data = {

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