From 1bb2687c3bad13a061e98887bdfb1a6b9ad79542 Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Mon, 2 Apr 2012 13:54:39 +0200 Subject: TTY: 68328serial, remove 68328serial.h All the needed stuff is moved to 68328serial.c now. Signed-off-by: Jiri Slaby Cc: Geert Uytterhoeven Cc: linux-m68k@lists.linux-m68k.org Acked-by: Greg Ungerer Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/68328serial.c | 79 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 76 insertions(+), 3 deletions(-) (limited to 'drivers/tty/serial/68328serial.c') diff --git a/drivers/tty/serial/68328serial.c b/drivers/tty/serial/68328serial.c index f0d5039..116d932 100644 --- a/drivers/tty/serial/68328serial.c +++ b/drivers/tty/serial/68328serial.c @@ -57,8 +57,6 @@ #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 @@ -66,9 +64,84 @@ #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; -- cgit v1.1