---

yaml
---
r: 304168
b: refs/heads/master
c: 1bb2687
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 107afb7a50726cb8ea9ed74d62311ddc59fef1da
+refs/heads/master: 1bb2687c3bad13a061e98887bdfb1a6b9ad79542

trunk/drivers/tty/serial/68328serial.c

@@ -57,18 +57,91 @@
 #endif /* CONFIG_M68VZ328 */
 #endif /* CONFIG_M68EZ328 */
 
-#include "68328serial.h"
-
 /* Turn off usage of real serial interrupt code, to "support" Copilot */
 #ifdef CONFIG_XCOPILOT_BUGS
 #undef USE_INTS
 #else
 #define USE_INTS
 #endif
 
+/*
+ * I believe this is the optimal setting that reduces the number of interrupts.
+ * At high speeds the output might become a little "bursted" (use USTCNT_TXHE
+ * if that bothers you), but in most cases it will not, since we try to
+ * transmit characters every time rs_interrupt is called. Thus, quite often
+ * you'll see that a receive interrupt occures before the transmit one.
+ *                                  -- Vladimir Gurevich
+ */
+#define USTCNT_TX_INTR_MASK (USTCNT_TXEE)
+
+/*
+ * 68328 and 68EZ328 UARTS are a little bit different. EZ328 has special
+ * "Old data interrupt" which occures whenever the data stay in the FIFO
+ * longer than 30 bits time. This allows us to use FIFO without compromising
+ * latency. '328 does not have this feature and without the real  328-based
+ * board I would assume that RXRE is the safest setting.
+ *
+ * For EZ328 I use RXHE (Half empty) interrupt to reduce the number of
+ * interrupts. RXFE (receive queue full) causes the system to lose data
+ * at least at 115200 baud
+ *
+ * If your board is busy doing other stuff, you might consider to use
+ * RXRE (data ready intrrupt) instead.
+ *
+ * The other option is to make these INTR masks run-time configurable, so
+ * that people can dynamically adapt them according to the current usage.
+ *                                  -- Vladimir Gurevich
+ */
+
+/* (es) */
+#if defined(CONFIG_M68EZ328) || defined(CONFIG_M68VZ328)
+#define USTCNT_RX_INTR_MASK (USTCNT_RXHE | USTCNT_ODEN)
+#elif defined(CONFIG_M68328)
+#define USTCNT_RX_INTR_MASK (USTCNT_RXRE)
+#else
+#error Please, define the Rx interrupt events for your CPU
+#endif
+/* (/es) */
+
+/*
+ * This is our internal structure for each serial port's state.
+ *
+ * For definitions of the flags field, see serial.h
+ */
+struct m68k_serial {
+	char			is_cons;	/* Is this our console. */
+	int			magic;
+	int			baud_base;
+	int			port;
+	int			irq;
+	int			flags;		/* defined in tty.h */
+	int			type;		/* UART type */
+	struct tty_struct	*tty;
+	int			custom_divisor;
+	int			x_char;		/* xon/xoff character */
+	int			close_delay;
+	unsigned short		closing_wait;
+	int			line;
+	int			count;		/* # of fd on device */
+	int			blocked_open;	/* # of blocked opens */
+	unsigned char		*xmit_buf;
+	int			xmit_head;
+	int			xmit_tail;
+	int			xmit_cnt;
+	wait_queue_head_t	open_wait;
+	wait_queue_head_t	close_wait;
+};
+
+#define SERIAL_MAGIC 0x5301
+
+/*
+ * Define the number of ports supported and their irqs.
+ */
+#define NR_PORTS 1
+
 static struct m68k_serial m68k_soft[NR_PORTS];
 
-static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS;
+static unsigned int uart_irqs[NR_PORTS] = { UART_IRQ_NUM };
 
 /* multiple ports are contiguous in memory */
 m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;