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Subject[PATCH v4 6/6] remoteproc/mediatek: Load ELF instead of bin file for mtk_scp.
Date
For better flexibility on loading firmware image, change firmware load
for mtk_scp from a plain binary file to ELF format instead.

Signed-off-by: Pi-Hsun Shih <pihsun@chromium.org>
---
Changes from v3:
- New patch to load ELF instead of plain bin file.
---
drivers/remoteproc/mtk_common.h | 2 ++
drivers/remoteproc/mtk_scp.c | 59 ++++++++++++++++++++++++++++++--
drivers/remoteproc/mtk_scp_ipi.c | 11 ++++--
3 files changed, 68 insertions(+), 4 deletions(-)

diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index 7efe2e7374e5ec..dffca9fbea9f1e 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -73,4 +73,6 @@ struct share_obj {
u8 share_buf[288];
};

+void scp_memcpy_aligned(void *dst, const void *src, unsigned int len);
+
#endif
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index c0375119c53289..314ae3f8a82cf7 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -140,6 +140,62 @@ static irqreturn_t scp_irq_handler(int irq, void *priv)
return IRQ_HANDLED;
}

+int scp_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
+{
+ struct device *dev = &rproc->dev;
+ struct elf32_hdr *ehdr;
+ struct elf32_phdr *phdr;
+ int i, ret = 0;
+ const u8 *elf_data = fw->data;
+
+ ehdr = (struct elf32_hdr *)elf_data;
+ phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff);
+
+ /* go through the available ELF segments */
+ for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
+ u32 da = phdr->p_paddr;
+ u32 memsz = phdr->p_memsz;
+ u32 filesz = phdr->p_filesz;
+ u32 offset = phdr->p_offset;
+ void __iomem *ptr;
+
+ if (phdr->p_type != PT_LOAD)
+ continue;
+
+ dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n",
+ phdr->p_type, da, memsz, filesz);
+
+ if (filesz > memsz) {
+ dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n",
+ filesz, memsz);
+ ret = -EINVAL;
+ break;
+ }
+
+ if (offset + filesz > fw->size) {
+ dev_err(dev, "truncated fw: need 0x%x avail 0x%zx\n",
+ offset + filesz, fw->size);
+ ret = -EINVAL;
+ break;
+ }
+
+ /* grab the kernel address for this device address */
+ ptr = rproc_da_to_va(rproc, da, memsz);
+ if (!ptr) {
+ dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz);
+ ret = -EINVAL;
+ break;
+ }
+
+ /* put the segment where the remote processor expects it */
+ if (phdr->p_filesz)
+ scp_memcpy_aligned(ptr, elf_data + phdr->p_offset,
+ filesz);
+ }
+
+ return ret;
+}
+
static int mtk_scp_load(struct rproc *rproc, const struct firmware *fw)
{
const struct mtk_scp *scp = rproc->priv;
@@ -157,8 +213,7 @@ static int mtk_scp_load(struct rproc *rproc, const struct firmware *fw)

writel(0x0, scp->reg_base + MT8183_SCP_SRAM_PDN);

- memcpy(scp->sram_base, fw->data, fw->size);
- return ret;
+ return scp_elf_load_segments(rproc, fw);
}

static int mtk_scp_start(struct rproc *rproc)
diff --git a/drivers/remoteproc/mtk_scp_ipi.c b/drivers/remoteproc/mtk_scp_ipi.c
index 1026089335a5c3..b6b248c9da50ac 100644
--- a/drivers/remoteproc/mtk_scp_ipi.c
+++ b/drivers/remoteproc/mtk_scp_ipi.c
@@ -55,7 +55,13 @@ void scp_ipi_unregister(struct platform_device *pdev, enum scp_ipi_id id)
}
EXPORT_SYMBOL_GPL(scp_ipi_unregister);

-static void memcpy_aligned(void *dst, const void *src, unsigned int len)
+/*
+ * Copy src to dst, where dst is in SCP SRAM region.
+ * Since AP access of SCP SRAM don't support byte write, this always write a
+ * full word at a time, and may cause some extra bytes to be written at the
+ * beginning & ending of dst.
+ */
+void scp_memcpy_aligned(void *dst, const void *src, unsigned int len)
{
void *ptr;
u32 val;
@@ -80,6 +86,7 @@ static void memcpy_aligned(void *dst, const void *src, unsigned int len)
writel_relaxed(val, dst + i);
}
}
+EXPORT_SYMBOL_GPL(scp_memcpy_aligned);

int scp_ipi_send(struct platform_device *pdev,
enum scp_ipi_id id,
@@ -117,7 +124,7 @@ int scp_ipi_send(struct platform_device *pdev,
}
} while (readl(scp->reg_base + MT8183_HOST_TO_SCP));

- memcpy_aligned(send_obj->share_buf, buf, len);
+ scp_memcpy_aligned(send_obj->share_buf, buf, len);

send_obj->len = len;
send_obj->id = id;
--
2.20.1.611.gfbb209baf1-goog
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