On Mon, Nov 30, 2020 at 11:40:25AM +0800, Tzung-Bi Shih wrote: > Reads the IPI buffer offset from the FW binary. The information resides > in addr of .ipi_buffer section. > > Moves scp_ipi_init() to scp_load() 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. > > Signed-off-by: Tzung-Bi Shih <tzungbi@xxxxxxxxxx> > --- > Previous discussion: > https://patchwork.kernel.org/project/linux-remoteproc/patch/20201127092941.1646260-1-tzungbi@xxxxxxxxxx/ > > Changes from v2: > - to backward-compatible, reads the default offset if the firmware doesn't > have it > > drivers/remoteproc/mtk_common.h | 2 + > drivers/remoteproc/mtk_scp.c | 79 +++++++++++++++++++++++---------- > 2 files changed, 57 insertions(+), 24 deletions(-) > > diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h > index b3397d327786..5169ddce2dc7 100644 > --- a/drivers/remoteproc/mtk_common.h > +++ b/drivers/remoteproc/mtk_common.h > @@ -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 { > diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c > index 5f42b9ce7185..5392c2fff682 100644 > --- a/drivers/remoteproc/mtk_scp.c > +++ b/drivers/remoteproc/mtk_scp.c > @@ -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 */ > @@ -350,11 +389,15 @@ static int scp_load(struct rproc *rproc, const struct firmware *fw) > > ret = scp->data->scp_before_load(scp); > if (ret < 0) > - return ret; > + goto leave; > > ret = scp_elf_load_segments(rproc, fw); > - clk_disable_unprepare(scp->clk); > + if (ret) > + goto leave; > > + ret = scp_ipi_init(scp, fw); This version is much better. Since this is effectively what is going on, please put this (along with clock related requirements) in rproc_ops::parse_fw. Thanks, Mathieu > +leave: > + clk_disable_unprepare(scp->clk); > return ret; > } > > @@ -680,19 +723,6 @@ 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) { > @@ -760,6 +790,7 @@ 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 = { > -- > 2.29.2.454.gaff20da3a2-goog >
