This interface will be used to configure properly some pins on
Merrifield that are shared with SCU.
scu_ipc_raw_command() writes SPTR and DPTR registers before sending
a command to SCU.
This code has been ported from Linux work done by Andy Shevchenko.
Signed-off-by: Georgii Staroselskii <georgii.starosels...@emlid.com>
---
arch/x86/include/asm/scu.h | 4 ++++
arch/x86/lib/scu.c | 35 +++++++++++++++++++++++++++++++++++
2 files changed, 39 insertions(+)
diff --git a/arch/x86/include/asm/scu.h b/arch/x86/include/asm/scu.h
index 7ce5824..f5ec5a1 100644
--- a/arch/x86/include/asm/scu.h
+++ b/arch/x86/include/asm/scu.h
@@ -6,6 +6,8 @@
#define _X86_ASM_SCU_IPC_H_
/* IPC defines the following message types */
+#define IPCMSG_INDIRECT_READ 0x02
+#define IPCMSG_INDIRECT_WRITE 0x05
#define IPCMSG_WARM_RESET 0xf0
#define IPCMSG_COLD_RESET 0xf1
#define IPCMSG_SOFT_RESET 0xf2
@@ -23,5 +25,7 @@ struct ipc_ifwi_version {
/* Issue commands to the SCU with or without data */
int scu_ipc_simple_command(u32 cmd, u32 sub);
int scu_ipc_command(u32 cmd, u32 sub, u32 *in, int inlen, u32 *out, int
outlen);
+int scu_ipc_raw_command(u32 cmd, u32 sub, u32 *in, int inlen, u32 *out,
+ int outlen, u32 dptr, u32 sptr);
#endif /* _X86_ASM_SCU_IPC_H_ */
diff --git a/arch/x86/lib/scu.c b/arch/x86/lib/scu.c
index caa04c6..847bb77 100644
--- a/arch/x86/lib/scu.c
+++ b/arch/x86/lib/scu.c
@@ -101,6 +101,41 @@ static int scu_ipc_cmd(struct ipc_regs *regs, u32 cmd, u32
sub,
return err;
}
+int scu_ipc_raw_command(u32 cmd, u32 sub, u32 *in, int inlen, u32 *out,
+ int outlen, u32 dptr, u32 sptr)
+{
+ int inbuflen = DIV_ROUND_UP(inlen, 4);
+ struct udevice *dev;
+ struct scu *scu;
+ int ret;
+
+ ret = syscon_get_by_driver_data(X86_SYSCON_SCU, &dev);
+ if (ret)
+ return ret;
+
+ scu = dev_get_priv(dev);
+
+ /* Up to 16 bytes */
+ if (inbuflen > 4)
+ return -EINVAL;
+
+ writel(dptr, &scu->regs->dptr);
+ writel(sptr, &scu->regs->sptr);
+
+ /*
+ * SRAM controller doesn't support 8-bit writes, it only
+ * supports 32-bit writes, so we have to copy input data into
+ * the temporary buffer, and SCU FW will use the inlen to
+ * determine the actual input data length in the temporary
+ * buffer.
+ */
+
+ u32 inbuf[4] = {0};
+
+ memcpy(inbuf, in, inlen);
+
+ return scu_ipc_cmd(scu->regs, cmd, sub, inbuf, inlen, out, outlen);
+}
/**
* scu_ipc_simple_command() - send a simple command
* @cmd: command
--
2.7.4
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