[PATCH v4] remoteproc/mediatek: read IPI buffer offset from FW
Tzung-Bi Shih
tzungbi at google.com
Tue Dec 1 23:46:09 EST 2020
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.
Signed-off-by: Tzung-Bi Shih <tzungbi at google.com>
---
Changes from v3[2]:
- move scp_ipi_init() to rproc_ops::parse_fw()
- separate error handling fixing if scp_before_load() fails to standalone
patch
Changes from v2[1]:
- to backward-compatible, reads the default offset if the firmware doesn't
have it
[1]: https://patchwork.kernel.org/project/linux-remoteproc/patch/20201127092941.1646260-1-tzungbi@google.com/
[2]: https://patchwork.kernel.org/project/linux-remoteproc/patch/20201130034025.3232229-1-tzungbi@google.com/
drivers/remoteproc/mtk_common.h | 2 +
drivers/remoteproc/mtk_scp.c | 89 +++++++++++++++++++++++++--------
2 files changed, 69 insertions(+), 22 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 c7d49c861adb..7c2dd1b5dd12 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 */
@@ -358,6 +397,23 @@ static int scp_load(struct rproc *rproc, const struct firmware *fw)
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;
@@ -461,6 +517,7 @@ 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,
};
/**
@@ -680,19 +737,6 @@ 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 +804,7 @@ 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
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