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