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         int (*tx_dma)(struct uart_8250_port *p);
  20         int (*rx_dma)(struct uart_8250_port *p, unsigned int iir);
  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         dma_addr_t              rx_addr;
  35         dma_addr_t              tx_addr;
  36
  37         dma_cookie_t            rx_cookie;
  38         dma_cookie_t            tx_cookie;
  39
  40         void                    *rx_buf;
  41
  42         size_t                  rx_size;
  43         size_t                  tx_size;
  44
  45         unsigned char           tx_running;
  46         unsigned char           tx_err;
  47         unsigned char           rx_running;
  48 };
  49
  50 struct old_serial_port {
  51         unsigned int uart;
  52         unsigned int baud_base;
  53         unsigned int port;
  54         unsigned int irq;
  55         upf_t        flags;
  56         unsigned char hub6;
  57         unsigned char io_type;
  58         unsigned char __iomem *iomem_base;
  59         unsigned short iomem_reg_shift;
  60         unsigned long irqflags;
  61 };
  62
  63 struct serial8250_config {
  64         const char      *name;
  65         unsigned short  fifo_size;
  66         unsigned short  tx_loadsz;
  67         unsigned char   fcr;
  68         unsigned char   rxtrig_bytes[UART_FCR_R_TRIG_MAX_STATE];
  69         unsigned int    flags;
  70 };
  71
  72 #define UART_CAP_FIFO   (1 << 8)        /* UART has FIFO */
  73 #define UART_CAP_EFR    (1 << 9)        /* UART has EFR */
  74 #define UART_CAP_SLEEP  (1 << 10)       /* UART has IER sleep */
  75 #define UART_CAP_AFE    (1 << 11)       /* MCR-based hw flow control */
  76 #define UART_CAP_UUE    (1 << 12)       /* UART needs IER bit 6 set (Xscale) */
  77 #define UART_CAP_RTOIE  (1 << 13)       /* UART needs IER bit 4 set (Xscale, Tegra) */
  78 #define UART_CAP_HFIFO  (1 << 14)       /* UART has a "hidden" FIFO */
  79 #define UART_CAP_RPM    (1 << 15)       /* Runtime PM is active while idle */
  80
  81 #define UART_BUG_QUOT   (1 << 0)        /* UART has buggy quot LSB */
  82 #define UART_BUG_TXEN   (1 << 1)        /* UART has buggy TX IIR status */
  83 #define UART_BUG_NOMSR  (1 << 2)        /* UART has buggy MSR status bits (Au1x00) */
  84 #define UART_BUG_THRE   (1 << 3)        /* UART has buggy THRE reassertion */
  85 #define UART_BUG_PARITY (1 << 4)        /* UART mishandles parity if FIFO enabled */
  86
  87 #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
  88
  89 #ifdef CONFIG_SERIAL_8250_SHARE_IRQ
  90 #define SERIAL8250_SHARE_IRQS 1
  91 #else
  92 #define SERIAL8250_SHARE_IRQS 0
  93 #endif
  94
  95 #define SERIAL8250_PORT_FLAGS(_base, _irq, _flags)              \
  96         {                                                       \
  97                 .iobase         = _base,                        \
  98                 .irq            = _irq,                         \
  99                 .uartclk        = 1843200,                      \
 100                 .iotype         = UPIO_PORT,                    \
 101                 .flags          = UPF_BOOT_AUTOCONF | (_flags), \
 102         }
 103
 104 #define SERIAL8250_PORT(_base, _irq) SERIAL8250_PORT_FLAGS(_base, _irq, 0)
 105
 106
 107 static inline int serial_in(struct uart_8250_port *up, int offset)
 108 {
 109         return up->port.serial_in(&up->port, offset);
 110 }
 111
 112 static inline void serial_out(struct uart_8250_port *up, int offset, int value)
 113 {
 114         up->port.serial_out(&up->port, offset, value);
 115 }
 116
 117 void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p);
 118
 119 static inline int serial_dl_read(struct uart_8250_port *up)
 120 {
 121         return up->dl_read(up);
 122 }
 123
 124 static inline void serial_dl_write(struct uart_8250_port *up, int value)
 125 {
 126         up->dl_write(up, value);
 127 }
 128
 129 struct uart_8250_port *serial8250_get_port(int line);
 130 void serial8250_rpm_get(struct uart_8250_port *p);
 131 void serial8250_rpm_put(struct uart_8250_port *p);
 132 int serial8250_em485_init(struct uart_8250_port *p);
 133 void serial8250_em485_destroy(struct uart_8250_port *p);
 134
 135 #if defined(__alpha__) && !defined(CONFIG_PCI)
 136 /*
 137  * Digital did something really horribly wrong with the OUT1 and OUT2
 138  * lines on at least some ALPHA's.  The failure mode is that if either
 139  * is cleared, the machine locks up with endless interrupts.
 140  */
 141 #define ALPHA_KLUDGE_MCR  (UART_MCR_OUT2 | UART_MCR_OUT1)
 142 #else
 143 #define ALPHA_KLUDGE_MCR 0
 144 #endif
 145
 146 #ifdef CONFIG_SERIAL_8250_PNP
 147 int serial8250_pnp_init(void);
 148 void serial8250_pnp_exit(void);
 149 #else
 150 static inline int serial8250_pnp_init(void) { return 0; }
 151 static inline void serial8250_pnp_exit(void) { }
 152 #endif
 153
 154 #ifdef CONFIG_ARCH_OMAP1
 155 static inline int is_omap1_8250(struct uart_8250_port *pt)
 156 {
 157         int res;
 158
 159         switch (pt->port.mapbase) {
 160         case OMAP1_UART1_BASE:
 161         case OMAP1_UART2_BASE:
 162         case OMAP1_UART3_BASE:
 163                 res = 1;
 164                 break;
 165         default:
 166                 res = 0;
 167                 break;
 168         }
 169
 170         return res;
 171 }
 172
 173 static inline int is_omap1510_8250(struct uart_8250_port *pt)
 174 {
 175         if (!cpu_is_omap1510())
 176                 return 0;
 177
 178         return is_omap1_8250(pt);
 179 }
 180 #else
 181 static inline int is_omap1_8250(struct uart_8250_port *pt)
 182 {
 183         return 0;
 184 }
 185 static inline int is_omap1510_8250(struct uart_8250_port *pt)
 186 {
 187         return 0;
 188 }
 189 #endif
 190
 191 #ifdef CONFIG_SERIAL_8250_DMA
 192 extern int serial8250_tx_dma(struct uart_8250_port *);
 193 extern int serial8250_rx_dma(struct uart_8250_port *, unsigned int iir);
 194 extern int serial8250_request_dma(struct uart_8250_port *);
 195 extern void serial8250_release_dma(struct uart_8250_port *);
 196 #else
 197 static inline int serial8250_tx_dma(struct uart_8250_port *p)
 198 {
 199         return -1;
 200 }
 201 static inline int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
 202 {
 203         return -1;
 204 }
 205 static inline int serial8250_request_dma(struct uart_8250_port *p)
 206 {
 207         return -1;
 208 }
 209 static inline void serial8250_release_dma(struct uart_8250_port *p) { }
 210 #endif
 211
 212 static inline int ns16550a_goto_highspeed(struct uart_8250_port *up)
 213 {
 214         unsigned char status;
 215
 216         status = serial_in(up, 0x04); /* EXCR2 */
 217 #define PRESL(x) ((x) & 0x30)
 218         if (PRESL(status) == 0x10) {
 219                 /* already in high speed mode */
 220                 return 0;
 221         } else {
 222                 status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
 223                 status |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */
 224                 serial_out(up, 0x04, status);
 225         }
 226         return 1;
 227 }
 228
 229 static inline int serial_index(struct uart_port *port)
 230 {
 231         return port->minor - 64;
 232 }
 233
 234 #if 0
 235 #define DEBUG_INTR(fmt...)      printk(fmt)
 236 #else
 237 #define DEBUG_INTR(fmt...)      do { } while (0)
 238 #endif