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);
  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 io_type;
  57         unsigned char __iomem *iomem_base;
  58         unsigned short iomem_reg_shift;
  59 };
  60
  61 struct serial8250_config {
  62         const char      *name;
  63         unsigned short  fifo_size;
  64         unsigned short  tx_loadsz;
  65         unsigned char   fcr;
  66         unsigned char   rxtrig_bytes[UART_FCR_R_TRIG_MAX_STATE];
  67         unsigned int    flags;
  68 };
  69
  70 #define UART_CAP_FIFO   (1 << 8)        /* UART has FIFO */
  71 #define UART_CAP_EFR    (1 << 9)        /* UART has EFR */
  72 #define UART_CAP_SLEEP  (1 << 10)       /* UART has IER sleep */
  73 #define UART_CAP_AFE    (1 << 11)       /* MCR-based hw flow control */
  74 #define UART_CAP_UUE    (1 << 12)       /* UART needs IER bit 6 set (Xscale) */
  75 #define UART_CAP_RTOIE  (1 << 13)       /* UART needs IER bit 4 set (Xscale, Tegra) */
  76 #define UART_CAP_HFIFO  (1 << 14)       /* UART has a "hidden" FIFO */
  77 #define UART_CAP_RPM    (1 << 15)       /* Runtime PM is active while idle */
  78
  79 #define UART_BUG_QUOT   (1 << 0)        /* UART has buggy quot LSB */
  80 #define UART_BUG_TXEN   (1 << 1)        /* UART has buggy TX IIR status */
  81 #define UART_BUG_NOMSR  (1 << 2)        /* UART has buggy MSR status bits (Au1x00) */
  82 #define UART_BUG_THRE   (1 << 3)        /* UART has buggy THRE reassertion */
  83 #define UART_BUG_PARITY (1 << 4)        /* UART mishandles parity if FIFO enabled */
  84
  85
  86 #ifdef CONFIG_SERIAL_8250_SHARE_IRQ
  87 #define SERIAL8250_SHARE_IRQS 1
  88 #else
  89 #define SERIAL8250_SHARE_IRQS 0
  90 #endif
  91
  92 #define SERIAL8250_PORT_FLAGS(_base, _irq, _flags)              \
  93         {                                                       \
  94                 .iobase         = _base,                        \
  95                 .irq            = _irq,                         \
  96                 .uartclk        = 1843200,                      \
  97                 .iotype         = UPIO_PORT,                    \
  98                 .flags          = UPF_BOOT_AUTOCONF | (_flags), \
  99         }
 100
 101 #define SERIAL8250_PORT(_base, _irq) SERIAL8250_PORT_FLAGS(_base, _irq, 0)
 102
 103
 104 static inline int serial_in(struct uart_8250_port *up, int offset)
 105 {
 106         return up->port.serial_in(&up->port, offset);
 107 }
 108
 109 static inline void serial_out(struct uart_8250_port *up, int offset, int value)
 110 {
 111         up->port.serial_out(&up->port, offset, value);
 112 }
 113
 114 void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p);
 115
 116 static inline int serial_dl_read(struct uart_8250_port *up)
 117 {
 118         return up->dl_read(up);
 119 }
 120
 121 static inline void serial_dl_write(struct uart_8250_port *up, int value)
 122 {
 123         up->dl_write(up, value);
 124 }
 125
 126 struct uart_8250_port *serial8250_get_port(int line);
 127 void serial8250_rpm_get(struct uart_8250_port *p);
 128 void serial8250_rpm_put(struct uart_8250_port *p);
 129 int serial8250_em485_init(struct uart_8250_port *p);
 130 void serial8250_em485_destroy(struct uart_8250_port *p);
 131
 132 static inline void serial8250_out_MCR(struct uart_8250_port *up, int value)
 133 {
 134         serial_out(up, UART_MCR, value);
 135 }
 136
 137 static inline int serial8250_in_MCR(struct uart_8250_port *up)
 138 {
 139         return serial_in(up, UART_MCR);
 140 }
 141
 142 #if defined(__alpha__) && !defined(CONFIG_PCI)
 143 /*
 144  * Digital did something really horribly wrong with the OUT1 and OUT2
 145  * lines on at least some ALPHA's.  The failure mode is that if either
 146  * is cleared, the machine locks up with endless interrupts.
 147  */
 148 #define ALPHA_KLUDGE_MCR  (UART_MCR_OUT2 | UART_MCR_OUT1)
 149 #else
 150 #define ALPHA_KLUDGE_MCR 0
 151 #endif
 152
 153 #ifdef CONFIG_SERIAL_8250_PNP
 154 int serial8250_pnp_init(void);
 155 void serial8250_pnp_exit(void);
 156 #else
 157 static inline int serial8250_pnp_init(void) { return 0; }
 158 static inline void serial8250_pnp_exit(void) { }
 159 #endif
 160
 161 #ifdef CONFIG_SERIAL_8250_FINTEK
 162 int fintek_8250_probe(struct uart_8250_port *uart);
 163 #else
 164 static inline int fintek_8250_probe(struct uart_8250_port *uart) { return 0; }
 165 #endif
 166
 167 #ifdef CONFIG_ARCH_OMAP1
 168 static inline int is_omap1_8250(struct uart_8250_port *pt)
 169 {
 170         int res;
 171
 172         switch (pt->port.mapbase) {
 173         case OMAP1_UART1_BASE:
 174         case OMAP1_UART2_BASE:
 175         case OMAP1_UART3_BASE:
 176                 res = 1;
 177                 break;
 178         default:
 179                 res = 0;
 180                 break;
 181         }
 182
 183         return res;
 184 }
 185
 186 static inline int is_omap1510_8250(struct uart_8250_port *pt)
 187 {
 188         if (!cpu_is_omap1510())
 189                 return 0;
 190
 191         return is_omap1_8250(pt);
 192 }
 193 #else
 194 static inline int is_omap1_8250(struct uart_8250_port *pt)
 195 {
 196         return 0;
 197 }
 198 static inline int is_omap1510_8250(struct uart_8250_port *pt)
 199 {
 200         return 0;
 201 }
 202 #endif
 203
 204 #ifdef CONFIG_SERIAL_8250_DMA
 205 extern int serial8250_tx_dma(struct uart_8250_port *);
 206 extern int serial8250_rx_dma(struct uart_8250_port *);
 207 extern void serial8250_rx_dma_flush(struct uart_8250_port *);
 208 extern int serial8250_request_dma(struct uart_8250_port *);
 209 extern void serial8250_release_dma(struct uart_8250_port *);
 210 #else
 211 static inline int serial8250_tx_dma(struct uart_8250_port *p)
 212 {
 213         return -1;
 214 }
 215 static inline int serial8250_rx_dma(struct uart_8250_port *p)
 216 {
 217         return -1;
 218 }
 219 static inline void serial8250_rx_dma_flush(struct uart_8250_port *p) { }
 220 static inline int serial8250_request_dma(struct uart_8250_port *p)
 221 {
 222         return -1;
 223 }
 224 static inline void serial8250_release_dma(struct uart_8250_port *p) { }
 225 #endif
 226
 227 static inline int ns16550a_goto_highspeed(struct uart_8250_port *up)
 228 {
 229         unsigned char status;
 230
 231         status = serial_in(up, 0x04); /* EXCR2 */
 232 #define PRESL(x) ((x) & 0x30)
 233         if (PRESL(status) == 0x10) {
 234                 /* already in high speed mode */
 235                 return 0;
 236         } else {
 237                 status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
 238                 status |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */
 239                 serial_out(up, 0x04, status);
 240         }
 241         return 1;
 242 }
 243
 244 static inline int serial_index(struct uart_port *port)
 245 {
 246         return port->minor - 64;
 247 }