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/serial_reg.h>
  16#include <linux/dmaengine.h>
  17
  18struct uart_8250_dma {
  19        int (*tx_dma)(struct uart_8250_port *p);
  20        int (*rx_dma)(struct uart_8250_port *p);
  21
  22        /* Filter function */
  23        dma_filter_fn           fn;
  24        /* Parameter to the filter function */
  25        void                    *rx_param;
  26        void                    *tx_param;
  27
  28        struct dma_slave_config rxconf;
  29        struct dma_slave_config txconf;
  30
  31        struct dma_chan         *rxchan;
  32        struct dma_chan         *txchan;
  33
  34        /* Device address base for DMA operations */
  35        phys_addr_t             rx_dma_addr;
  36        phys_addr_t             tx_dma_addr;
  37
  38        /* DMA address of the buffer in memory */
  39        dma_addr_t              rx_addr;
  40        dma_addr_t              tx_addr;
  41
  42        dma_cookie_t            rx_cookie;
  43        dma_cookie_t            tx_cookie;
  44
  45        void                    *rx_buf;
  46
  47        size_t                  rx_size;
  48        size_t                  tx_size;
  49
  50        unsigned char           tx_running;
  51        unsigned char           tx_err;
  52        unsigned char           rx_running;
  53};
  54
  55struct old_serial_port {
  56        unsigned int uart;
  57        unsigned int baud_base;
  58        unsigned int port;
  59        unsigned int irq;
  60        upf_t        flags;
  61        unsigned char io_type;
  62        unsigned char __iomem *iomem_base;
  63        unsigned short iomem_reg_shift;
  64};
  65
  66struct serial8250_config {
  67        const char      *name;
  68        unsigned short  fifo_size;
  69        unsigned short  tx_loadsz;
  70        unsigned char   fcr;
  71        unsigned char   rxtrig_bytes[UART_FCR_R_TRIG_MAX_STATE];
  72        unsigned int    flags;
  73};
  74
  75#define UART_CAP_FIFO   (1 << 8)        /* UART has FIFO */
  76#define UART_CAP_EFR    (1 << 9)        /* UART has EFR */
  77#define UART_CAP_SLEEP  (1 << 10)       /* UART has IER sleep */
  78#define UART_CAP_AFE    (1 << 11)       /* MCR-based hw flow control */
  79#define UART_CAP_UUE    (1 << 12)       /* UART needs IER bit 6 set (Xscale) */
  80#define UART_CAP_RTOIE  (1 << 13)       /* UART needs IER bit 4 set (Xscale, Tegra) */
  81#define UART_CAP_HFIFO  (1 << 14)       /* UART has a "hidden" FIFO */
  82#define UART_CAP_RPM    (1 << 15)       /* Runtime PM is active while idle */
  83#define UART_CAP_IRDA   (1 << 16)       /* UART supports IrDA line discipline */
  84#define UART_CAP_MINI   (1 << 17)       /* Mini UART on BCM283X family lacks:
  85                                         * STOP PARITY EPAR SPAR WLEN5 WLEN6
  86                                         */
  87
  88#define UART_BUG_QUOT   (1 << 0)        /* UART has buggy quot LSB */
  89#define UART_BUG_TXEN   (1 << 1)        /* UART has buggy TX IIR status */
  90#define UART_BUG_NOMSR  (1 << 2)        /* UART has buggy MSR status bits (Au1x00) */
  91#define UART_BUG_THRE   (1 << 3)        /* UART has buggy THRE reassertion */
  92#define UART_BUG_PARITY (1 << 4)        /* UART mishandles parity if FIFO enabled */
  93
  94
  95#ifdef CONFIG_SERIAL_8250_SHARE_IRQ
  96#define SERIAL8250_SHARE_IRQS 1
  97#else
  98#define SERIAL8250_SHARE_IRQS 0
  99#endif
 100
 101#define SERIAL8250_PORT_FLAGS(_base, _irq, _flags)              \
 102        {                                                       \
 103                .iobase         = _base,                        \
 104                .irq            = _irq,                         \
 105                .uartclk        = 1843200,                      \
 106                .iotype         = UPIO_PORT,                    \
 107                .flags          = UPF_BOOT_AUTOCONF | (_flags), \
 108        }
 109
 110#define SERIAL8250_PORT(_base, _irq) SERIAL8250_PORT_FLAGS(_base, _irq, 0)
 111
 112
 113static inline int serial_in(struct uart_8250_port *up, int offset)
 114{
 115        return up->port.serial_in(&up->port, offset);
 116}
 117
 118static inline void serial_out(struct uart_8250_port *up, int offset, int value)
 119{
 120        up->port.serial_out(&up->port, offset, value);
 121}
 122
 123void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p);
 124
 125static inline int serial_dl_read(struct uart_8250_port *up)
 126{
 127        return up->dl_read(up);
 128}
 129
 130static inline void serial_dl_write(struct uart_8250_port *up, int value)
 131{
 132        up->dl_write(up, value);
 133}
 134
 135struct uart_8250_port *serial8250_get_port(int line);
 136
 137void serial8250_rpm_get(struct uart_8250_port *p);
 138void serial8250_rpm_put(struct uart_8250_port *p);
 139
 140void serial8250_rpm_get_tx(struct uart_8250_port *p);
 141void serial8250_rpm_put_tx(struct uart_8250_port *p);
 142
 143int serial8250_em485_init(struct uart_8250_port *p);
 144void serial8250_em485_destroy(struct uart_8250_port *p);
 145
 146static inline void serial8250_out_MCR(struct uart_8250_port *up, int value)
 147{
 148        serial_out(up, UART_MCR, value);
 149}
 150
 151static inline int serial8250_in_MCR(struct uart_8250_port *up)
 152{
 153        return serial_in(up, UART_MCR);
 154}
 155
 156#if defined(__alpha__) && !defined(CONFIG_PCI)
 157/*
 158 * Digital did something really horribly wrong with the OUT1 and OUT2
 159 * lines on at least some ALPHA's.  The failure mode is that if either
 160 * is cleared, the machine locks up with endless interrupts.
 161 */
 162#define ALPHA_KLUDGE_MCR  (UART_MCR_OUT2 | UART_MCR_OUT1)
 163#else
 164#define ALPHA_KLUDGE_MCR 0
 165#endif
 166
 167#ifdef CONFIG_SERIAL_8250_PNP
 168int serial8250_pnp_init(void);
 169void serial8250_pnp_exit(void);
 170#else
 171static inline int serial8250_pnp_init(void) { return 0; }
 172static inline void serial8250_pnp_exit(void) { }
 173#endif
 174
 175#ifdef CONFIG_SERIAL_8250_FINTEK
 176int fintek_8250_probe(struct uart_8250_port *uart);
 177#else
 178static inline int fintek_8250_probe(struct uart_8250_port *uart) { return 0; }
 179#endif
 180
 181#ifdef CONFIG_ARCH_OMAP1
 182static inline int is_omap1_8250(struct uart_8250_port *pt)
 183{
 184        int res;
 185
 186        switch (pt->port.mapbase) {
 187        case OMAP1_UART1_BASE:
 188        case OMAP1_UART2_BASE:
 189        case OMAP1_UART3_BASE:
 190                res = 1;
 191                break;
 192        default:
 193                res = 0;
 194                break;
 195        }
 196
 197        return res;
 198}
 199
 200static inline int is_omap1510_8250(struct uart_8250_port *pt)
 201{
 202        if (!cpu_is_omap1510())
 203                return 0;
 204
 205        return is_omap1_8250(pt);
 206}
 207#else
 208static inline int is_omap1_8250(struct uart_8250_port *pt)
 209{
 210        return 0;
 211}
 212static inline int is_omap1510_8250(struct uart_8250_port *pt)
 213{
 214        return 0;
 215}
 216#endif
 217
 218#ifdef CONFIG_SERIAL_8250_DMA
 219extern int serial8250_tx_dma(struct uart_8250_port *);
 220extern int serial8250_rx_dma(struct uart_8250_port *);
 221extern void serial8250_rx_dma_flush(struct uart_8250_port *);
 222extern int serial8250_request_dma(struct uart_8250_port *);
 223extern void serial8250_release_dma(struct uart_8250_port *);
 224#else
 225static inline int serial8250_tx_dma(struct uart_8250_port *p)
 226{
 227        return -1;
 228}
 229static inline int serial8250_rx_dma(struct uart_8250_port *p)
 230{
 231        return -1;
 232}
 233static inline void serial8250_rx_dma_flush(struct uart_8250_port *p) { }
 234static inline int serial8250_request_dma(struct uart_8250_port *p)
 235{
 236        return -1;
 237}
 238static inline void serial8250_release_dma(struct uart_8250_port *p) { }
 239#endif
 240
 241static inline int ns16550a_goto_highspeed(struct uart_8250_port *up)
 242{
 243        unsigned char status;
 244
 245        status = serial_in(up, 0x04); /* EXCR2 */
 246#define PRESL(x) ((x) & 0x30)
 247        if (PRESL(status) == 0x10) {
 248                /* already in high speed mode */
 249                return 0;
 250        } else {
 251                status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
 252                status |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */
 253                serial_out(up, 0x04, status);
 254        }
 255        return 1;
 256}
 257
 258static inline int serial_index(struct uart_port *port)
 259{
 260        return port->minor - 64;
 261}
 262