LXR linux/drivers/tty/serial/8250/8250.h

   1/*
   2 *  Driver for 8250/16550-type serial ports
   3 *
   4 *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
   5 *
   6 *  Copyright (C) 2001 Russell King.
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 */
  13
  14#include <linux/serial_8250.h>
  15#include <linux/dmaengine.h>
  16
  17struct uart_8250_dma {
  18        dma_filter_fn           fn;
  19        void                    *rx_param;
  20        void                    *tx_param;
  21
  22        int                     rx_chan_id;
  23        int                     tx_chan_id;
  24
  25        struct dma_slave_config rxconf;
  26        struct dma_slave_config txconf;
  27
  28        struct dma_chan         *rxchan;
  29        struct dma_chan         *txchan;
  30
  31        dma_addr_t              rx_addr;
  32        dma_addr_t              tx_addr;
  33
  34        dma_cookie_t            rx_cookie;
  35        dma_cookie_t            tx_cookie;
  36
  37        void                    *rx_buf;
  38
  39        size_t                  rx_size;
  40        size_t                  tx_size;
  41
  42        unsigned char           tx_running:1;
  43};
  44
  45struct old_serial_port {
  46        unsigned int uart;
  47        unsigned int baud_base;
  48        unsigned int port;
  49        unsigned int irq;
  50        unsigned int flags;
  51        unsigned char hub6;
  52        unsigned char io_type;
  53        unsigned char *iomem_base;
  54        unsigned short iomem_reg_shift;
  55        unsigned long irqflags;
  56};
  57
  58struct serial8250_config {
  59        const char      *name;
  60        unsigned short  fifo_size;
  61        unsigned short  tx_loadsz;
  62        unsigned char   fcr;
  63        unsigned int    flags;
  64};
  65
  66#define UART_CAP_FIFO   (1 << 8)        /* UART has FIFO */
  67#define UART_CAP_EFR    (1 << 9)        /* UART has EFR */
  68#define UART_CAP_SLEEP  (1 << 10)       /* UART has IER sleep */
  69#define UART_CAP_AFE    (1 << 11)       /* MCR-based hw flow control */
  70#define UART_CAP_UUE    (1 << 12)       /* UART needs IER bit 6 set (Xscale) */
  71#define UART_CAP_RTOIE  (1 << 13)       /* UART needs IER bit 4 set (Xscale, Tegra) */
  72#define UART_CAP_HFIFO  (1 << 14)       /* UART has a "hidden" FIFO */
  73
  74#define UART_BUG_QUOT   (1 << 0)        /* UART has buggy quot LSB */
  75#define UART_BUG_TXEN   (1 << 1)        /* UART has buggy TX IIR status */
  76#define UART_BUG_NOMSR  (1 << 2)        /* UART has buggy MSR status bits (Au1x00) */
  77#define UART_BUG_THRE   (1 << 3)        /* UART has buggy THRE reassertion */
  78#define UART_BUG_PARITY (1 << 4)        /* UART mishandles parity if FIFO enabled */
  79
  80#define PROBE_RSA       (1 << 0)
  81#define PROBE_ANY       (~0)
  82
  83#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
  84
  85#ifdef CONFIG_SERIAL_8250_SHARE_IRQ
  86#define SERIAL8250_SHARE_IRQS 1
  87#else
  88#define SERIAL8250_SHARE_IRQS 0
  89#endif
  90
  91static inline int serial_in(struct uart_8250_port *up, int offset)
  92{
  93        return up->port.serial_in(&up->port, offset);
  94}
  95
  96static inline void serial_out(struct uart_8250_port *up, int offset, int value)
  97{
  98        up->port.serial_out(&up->port, offset, value);
  99}
 100
 101void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p);
 102
 103static inline int serial_dl_read(struct uart_8250_port *up)
 104{
 105        return up->dl_read(up);
 106}
 107
 108static inline void serial_dl_write(struct uart_8250_port *up, int value)
 109{
 110        up->dl_write(up, value);
 111}
 112
 113#if defined(__alpha__) && !defined(CONFIG_PCI)
 114/*
 115 * Digital did something really horribly wrong with the OUT1 and OUT2
 116 * lines on at least some ALPHA's.  The failure mode is that if either
 117 * is cleared, the machine locks up with endless interrupts.
 118 */
 119#define ALPHA_KLUDGE_MCR  (UART_MCR_OUT2 | UART_MCR_OUT1)
 120#else
 121#define ALPHA_KLUDGE_MCR 0
 122#endif
 123
 124#ifdef CONFIG_SERIAL_8250_PNP
 125int serial8250_pnp_init(void);
 126void serial8250_pnp_exit(void);
 127#else
 128static inline int serial8250_pnp_init(void) { return 0; }
 129static inline void serial8250_pnp_exit(void) { }
 130#endif
 131
 132#ifdef CONFIG_ARCH_OMAP1
 133static inline int is_omap1_8250(struct uart_8250_port *pt)
 134{
 135        int res;
 136
 137        switch (pt->port.mapbase) {
 138        case OMAP1_UART1_BASE:
 139        case OMAP1_UART2_BASE:
 140        case OMAP1_UART3_BASE:
 141                res = 1;
 142                break;
 143        default:
 144                res = 0;
 145                break;
 146        }
 147
 148        return res;
 149}
 150
 151static inline int is_omap1510_8250(struct uart_8250_port *pt)
 152{
 153        if (!cpu_is_omap1510())
 154                return 0;
 155
 156        return is_omap1_8250(pt);
 157}
 158#else
 159static inline int is_omap1_8250(struct uart_8250_port *pt)
 160{
 161        return 0;
 162}
 163static inline int is_omap1510_8250(struct uart_8250_port *pt)
 164{
 165        return 0;
 166}
 167#endif
 168
 169#ifdef CONFIG_SERIAL_8250_DMA
 170extern int serial8250_tx_dma(struct uart_8250_port *);
 171extern int serial8250_rx_dma(struct uart_8250_port *, unsigned int iir);
 172extern int serial8250_request_dma(struct uart_8250_port *);
 173extern void serial8250_release_dma(struct uart_8250_port *);
 174#else
 175static inline int serial8250_tx_dma(struct uart_8250_port *p)
 176{
 177        return -1;
 178}
 179static inline int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
 180{
 181        return -1;
 182}
 183static inline int serial8250_request_dma(struct uart_8250_port *p)
 184{
 185        return -1;
 186}
 187static inline void serial8250_release_dma(struct uart_8250_port *p) { }
 188#endif
 189