serial: sh-sci: Add BRG register definitions
Add register definitions for the Baud Rate Generator for External Clock
(BRG), as found in some SCIF and in HSCIF, including a new regtype for
the "SH-4(A)"-derived SCIF variant with BRG.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/sh-sci.h b/drivers/tty/serial/sh-sci.h
index bf69bbd..fb17602 100644
--- a/drivers/tty/serial/sh-sci.h
+++ b/drivers/tty/serial/sh-sci.h
@@ -27,6 +27,8 @@
HSSRR, /* Sampling Rate Register */
SCPCR, /* Serial Port Control Register */
SCPDR, /* Serial Port Data Register */
+ SCDL, /* BRG Frequency Division Register */
+ SCCKS, /* BRG Clock Select Register */
SCIx_NR_REGS,
};
@@ -109,6 +111,14 @@
#define SCPDR_RTSD BIT(4) /* Serial Port RTS Output Pin Data */
#define SCPDR_CTSD BIT(3) /* Serial Port CTS Input Pin Data */
+/*
+ * BRG Clock Select Register (Some SCIF and HSCIF)
+ * The Baud Rate Generator for external clock can provide a clock source for
+ * the sampling clock. It outputs either its frequency divided clock, or the
+ * (undivided) (H)SCK external clock.
+ */
+#define SCCKS_CKS BIT(15) /* Select (H)SCK (1) or divided SC_CLK (0) */
+#define SCCKS_XIN BIT(14) /* SC_CLK uses bus clock (1) or SCIF_CLK (0) */
#define SCxSR_TEND(port) (((port)->type == PORT_SCI) ? SCI_TEND : SCIF_TEND)
#define SCxSR_RDxF(port) (((port)->type == PORT_SCI) ? SCI_RDRF : SCIF_RDF)