drivers: serial: jsm: Add Classic board UART structure

This commit adds the UART structure for the Digi Classic cards. This
code comes from the staging/dgnc driver.

Signed-off-by: Konrad Zapalowicz <bergo.torino@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 58 insertions, 1 deletions

diff --git a/drivers/tty/serial/jsm/jsm.h b/drivers/tty/serial/jsm/jsm.h
index af7013488aeb..9861639d838f 100644
--- a/drivers/tty/serial/jsm/jsm.h
+++ b/drivers/tty/serial/jsm/jsm.h
@@ -222,7 +222,10 @@ struct jsm_channel {
         u8              ch_mostat;      /* FEP output modem status      */
         u8              ch_mistat;      /* FEP input modem status       */
 
-        struct neo_uart_struct __iomem *ch_neo_uart;    /* Pointer to the "mapped" UART struct */
+        /* Pointers to the "mapped" UART structs */
+        struct neo_uart_struct __iomem *ch_neo_uart; /* NEO card */
+        struct cls_uart_struct __iomem *ch_cls_uart; /* Classic card */
+
         u8              ch_cached_lsr;  /* Cached value of the LSR register */
 
         u8              *ch_rqueue;     /* Our read queue buffer - malloc'ed */
@@ -254,6 +257,60 @@ struct jsm_channel {
         u64             ch_xoff_sends;  /* Count of xoffs transmitted */
 };
 
+/************************************************************************
+ * Per channel/port Classic UART structures                             *
+ ************************************************************************
+ *              Base Structure Entries Usage Meanings to Host           *
+ *                                                                      *
+ *      W = read write          R = read only                           *
+ *                      U = Unused.                                     *
+ ************************************************************************/
+
+struct cls_uart_struct {
+        u8 txrx;        /* WR  RHR/THR - Holding Reg */
+        u8 ier;         /* WR  IER - Interrupt Enable Reg */
+        u8 isr_fcr;     /* WR  ISR/FCR - Interrupt Status Reg/Fifo Control Reg*/
+        u8 lcr;         /* WR  LCR - Line Control Reg */
+        u8 mcr;         /* WR  MCR - Modem Control Reg */
+        u8 lsr;         /* WR  LSR - Line Status Reg */
+        u8 msr;         /* WR  MSR - Modem Status Reg */
+        u8 spr;         /* WR  SPR - Scratch Pad Reg */
+};
+
+/* Where to read the interrupt register (8bits) */
+#define UART_CLASSIC_POLL_ADDR_OFFSET   0x40
+
+#define UART_EXAR654_ENHANCED_REGISTER_SET 0xBF
+
+#define UART_16654_FCR_TXTRIGGER_8      0x0
+#define UART_16654_FCR_TXTRIGGER_16     0x10
+#define UART_16654_FCR_TXTRIGGER_32     0x20
+#define UART_16654_FCR_TXTRIGGER_56     0x30
+
+#define UART_16654_FCR_RXTRIGGER_8      0x0
+#define UART_16654_FCR_RXTRIGGER_16     0x40
+#define UART_16654_FCR_RXTRIGGER_56     0x80
+#define UART_16654_FCR_RXTRIGGER_60     0xC0
+
+#define UART_IIR_CTSRTS                 0x20    /* Received CTS/RTS change of state */
+#define UART_IIR_RDI_TIMEOUT            0x0C    /* Receiver data TIMEOUT */
+
+/*
+ * These are the EXTENDED definitions for the Exar 654's Interrupt
+ * Enable Register.
+ */
+#define UART_EXAR654_EFR_ECB      0x10    /* Enhanced control bit */
+#define UART_EXAR654_EFR_IXON     0x2     /* Receiver compares Xon1/Xoff1 */
+#define UART_EXAR654_EFR_IXOFF    0x8     /* Transmit Xon1/Xoff1 */
+#define UART_EXAR654_EFR_RTSDTR   0x40    /* Auto RTS/DTR Flow Control Enable */
+#define UART_EXAR654_EFR_CTSDSR   0x80    /* Auto CTS/DSR Flow COntrol Enable */
+
+#define UART_EXAR654_XOFF_DETECT  0x1     /* Indicates whether chip saw an incoming XOFF char  */
+#define UART_EXAR654_XON_DETECT   0x2     /* Indicates whether chip saw an incoming XON char */
+
+#define UART_EXAR654_IER_XOFF     0x20    /* Xoff Interrupt Enable */
+#define UART_EXAR654_IER_RTSDTR   0x40    /* Output Interrupt Enable */
+#define UART_EXAR654_IER_CTSDSR   0x80    /* Input Interrupt Enable */
 
 /************************************************************************
  * Per channel/port NEO UART structure                                  *