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
  17 struct 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
  45 struct 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
  58 struct 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
  91 static inline int serial_in(struct uart_8250_port *up, int offset)
  92 {
  93         return up->port.serial_in(&up->port, offset);
  94 }
  95
  96 static 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
 101 void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p);
 102
 103 static inline int serial_dl_read(struct uart_8250_port *up)
 104 {
 105         return up->dl_read(up);
 106 }
 107
 108 static 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
 125 int serial8250_pnp_init(void);
 126 void serial8250_pnp_exit(void);
 127 #else
 128 static inline int serial8250_pnp_init(void) { return 0; }
 129 static inline void serial8250_pnp_exit(void) { }
 130 #endif
 131
 132 #ifdef CONFIG_ARCH_OMAP1
 133 static 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
 151 static 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
 159 static inline int is_omap1_8250(struct uart_8250_port *pt)
 160 {
 161         return 0;
 162 }
 163 static inline int is_omap1510_8250(struct uart_8250_port *pt)
 164 {
 165         return 0;
 166 }
 167 #endif
 168
 169 #ifdef CONFIG_SERIAL_8250_DMA
 170 extern int serial8250_tx_dma(struct uart_8250_port *);
 171 extern int serial8250_rx_dma(struct uart_8250_port *, unsigned int iir);
 172 extern int serial8250_request_dma(struct uart_8250_port *);
 173 extern void serial8250_release_dma(struct uart_8250_port *);
 174 #else
 175 static inline int serial8250_tx_dma(struct uart_8250_port *p)
 176 {
 177         return -1;
 178 }
 179 static inline int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
 180 {
 181         return -1;
 182 }
 183 static inline int serial8250_request_dma(struct uart_8250_port *p)
 184 {
 185         return -1;
 186 }
 187 static inline void serial8250_release_dma(struct uart_8250_port *p) { }
 188 #endif