serial: sh-sci: Generalize overrun handling.

This consolidates all of the broken out overrun handling and ensures that
we have sensible defaults per-port type, in addition to making sure that
overruns are flagged appropriately in the error mask for parts that
haven't explicitly disabled support for it.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/include/linux/serial_sci.h b/include/linux/serial_sci.h
index a2afc9fbe186..5fac3bccfd87 100644
--- a/include/linux/serial_sci.h
+++ b/include/linux/serial_sci.h
@@ -8,6 +8,8 @@
  * Generic header for SuperH SCI(F) (used by sh/sh64/h8300 and related parts)
  */
 
+#define SCIx_NOT_SUPPORTED      (-1)
+
 enum {
         SCBRR_ALGO_1,           /* ((clk + 16 * bps) / (16 * bps) - 1) */
         SCBRR_ALGO_2,           /* ((clk + 16 * bps) / (32 * bps) - 1) */
@@ -25,6 +27,28 @@ enum {
 #define SCSCR_CKE1      (1 << 1)
 #define SCSCR_CKE0      (1 << 0)
 
+/* SCxSR SCI */
+#define SCI_TDRE  0x80
+#define SCI_RDRF  0x40
+#define SCI_ORER  0x20
+#define SCI_FER   0x10
+#define SCI_PER   0x08
+#define SCI_TEND  0x04
+
+#define SCI_DEFAULT_ERROR_MASK (SCI_PER | SCI_FER)
+
+/* SCxSR SCIF */
+#define SCIF_ER    0x0080
+#define SCIF_TEND  0x0040
+#define SCIF_TDFE  0x0020
+#define SCIF_BRK   0x0010
+#define SCIF_FER   0x0008
+#define SCIF_PER   0x0004
+#define SCIF_RDF   0x0002
+#define SCIF_DR    0x0001
+
+#define SCIF_DEFAULT_ERROR_MASK (SCIF_PER | SCIF_FER | SCIF_ER | SCIF_BRK)
+
 /* Offsets into the sci_port->irqs array */
 enum {
         SCIx_ERI_IRQ,
@@ -56,6 +80,12 @@ struct plat_sci_port {
         unsigned int    scbrr_algo_id;          /* SCBRR calculation algo */
         unsigned int    scscr;                  /* SCSCR initialization */
 
+        /*
+         * Platform overrides if necessary, defaults otherwise.
+         */
+        int             overrun_bit;
+        unsigned int    error_mask;
+
         struct device   *dma_dev;
 
         unsigned int    dma_slave_tx;