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 #include "../serial_mctrl_gpio.h"
  19
  20 struct uart_8250_dma {
  21         int (*tx_dma)(struct uart_8250_port *p);
  22         int (*rx_dma)(struct uart_8250_port *p);
  23
  24         /* Filter function */
  25         dma_filter_fn           fn;
  26         /* Parameter to the filter function */
  27         void                    *rx_param;
  28         void                    *tx_param;
  29
  30         struct dma_slave_config rxconf;
  31         struct dma_slave_config txconf;
  32
  33         struct dma_chan         *rxchan;
  34         struct dma_chan         *txchan;
  35
  36         dma_addr_t              rx_addr;
  37         dma_addr_t              tx_addr;
  38
  39         dma_cookie_t            rx_cookie;
  40         dma_cookie_t            tx_cookie;
  41
  42         void                    *rx_buf;
  43
  44         size_t                  rx_size;
  45         size_t                  tx_size;
  46
  47         unsigned char           tx_running;
  48         unsigned char           tx_err;
  49         unsigned char           rx_running;
  50 };
  51
  52 struct old_serial_port {
  53         unsigned int uart;
  54         unsigned int baud_base;
  55         unsigned int port;
  56         unsigned int irq;
  57         upf_t        flags;
  58         unsigned char io_type;
  59         unsigned char __iomem *iomem_base;
  60         unsigned short iomem_reg_shift;
  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
  88 #ifdef CONFIG_SERIAL_8250_SHARE_IRQ
  89 #define SERIAL8250_SHARE_IRQS 1
  90 #else
  91 #define SERIAL8250_SHARE_IRQS 0
  92 #endif
  93
  94 #define SERIAL8250_PORT_FLAGS(_base, _irq, _flags)              \
  95         {                                                       \
  96                 .iobase         = _base,                        \
  97                 .irq            = _irq,                         \
  98                 .uartclk        = 1843200,                      \
  99                 .iotype         = UPIO_PORT,                    \
 100                 .flags          = UPF_BOOT_AUTOCONF | (_flags), \
 101         }
 102
 103 #define SERIAL8250_PORT(_base, _irq) SERIAL8250_PORT_FLAGS(_base, _irq, 0)
 104
 105
 106 static inline int serial_in(struct uart_8250_port *up, int offset)
 107 {
 108         return up->port.serial_in(&up->port, offset);
 109 }
 110
 111 static inline void serial_out(struct uart_8250_port *up, int offset, int value)
 112 {
 113         up->port.serial_out(&up->port, offset, value);
 114 }
 115
 116 void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p);
 117
 118 static inline int serial_dl_read(struct uart_8250_port *up)
 119 {
 120         return up->dl_read(up);
 121 }
 122
 123 static inline void serial_dl_write(struct uart_8250_port *up, int value)
 124 {
 125         up->dl_write(up, value);
 126 }
 127
 128 struct uart_8250_port *serial8250_get_port(int line);
 129 void serial8250_rpm_get(struct uart_8250_port *p);
 130 void serial8250_rpm_put(struct uart_8250_port *p);
 131 int serial8250_em485_init(struct uart_8250_port *p);
 132 void serial8250_em485_destroy(struct uart_8250_port *p);
 133
 134 static inline void serial8250_out_MCR(struct uart_8250_port *up, int value)
 135 {
 136         int mctrl_gpio = 0;
 137
 138         serial_out(up, UART_MCR, value);
 139
 140         if (value & UART_MCR_RTS)
 141                 mctrl_gpio |= TIOCM_RTS;
 142         if (value & UART_MCR_DTR)
 143                 mctrl_gpio |= TIOCM_DTR;
 144
 145         mctrl_gpio_set(up->gpios, mctrl_gpio);
 146 }
 147
 148 static inline int serial8250_in_MCR(struct uart_8250_port *up)
 149 {
 150         int mctrl, mctrl_gpio = 0;
 151
 152         mctrl = serial_in(up, UART_MCR);
 153
 154         /* save current MCR values */
 155         if (mctrl & UART_MCR_RTS)
 156                 mctrl_gpio |= TIOCM_RTS;
 157         if (mctrl & UART_MCR_DTR)
 158                 mctrl_gpio |= TIOCM_DTR;
 159
 160         mctrl_gpio = mctrl_gpio_get_outputs(up->gpios, &mctrl_gpio);
 161
 162         if (mctrl_gpio & TIOCM_RTS)
 163                 mctrl |= UART_MCR_RTS;
 164         else
 165                 mctrl &= ~UART_MCR_RTS;
 166
 167         if (mctrl_gpio & TIOCM_DTR)
 168                 mctrl |= UART_MCR_DTR;
 169         else
 170                 mctrl &= ~UART_MCR_DTR;
 171
 172         return mctrl;
 173 }
 174
 175 #if defined(__alpha__) && !defined(CONFIG_PCI)
 176 /*
 177  * Digital did something really horribly wrong with the OUT1 and OUT2
 178  * lines on at least some ALPHA's.  The failure mode is that if either
 179  * is cleared, the machine locks up with endless interrupts.
 180  */
 181 #define ALPHA_KLUDGE_MCR  (UART_MCR_OUT2 | UART_MCR_OUT1)
 182 #else
 183 #define ALPHA_KLUDGE_MCR 0
 184 #endif
 185
 186 #ifdef CONFIG_SERIAL_8250_PNP
 187 int serial8250_pnp_init(void);
 188 void serial8250_pnp_exit(void);
 189 #else
 190 static inline int serial8250_pnp_init(void) { return 0; }
 191 static inline void serial8250_pnp_exit(void) { }
 192 #endif
 193
 194 #ifdef CONFIG_SERIAL_8250_FINTEK
 195 int fintek_8250_probe(struct uart_8250_port *uart);
 196 #else
 197 static inline int fintek_8250_probe(struct uart_8250_port *uart) { return 0; }
 198 #endif
 199
 200 #ifdef CONFIG_ARCH_OMAP1
 201 static inline int is_omap1_8250(struct uart_8250_port *pt)
 202 {
 203         int res;
 204
 205         switch (pt->port.mapbase) {
 206         case OMAP1_UART1_BASE:
 207         case OMAP1_UART2_BASE:
 208         case OMAP1_UART3_BASE:
 209                 res = 1;
 210                 break;
 211         default:
 212                 res = 0;
 213                 break;
 214         }
 215
 216         return res;
 217 }
 218
 219 static inline int is_omap1510_8250(struct uart_8250_port *pt)
 220 {
 221         if (!cpu_is_omap1510())
 222                 return 0;
 223
 224         return is_omap1_8250(pt);
 225 }
 226 #else
 227 static inline int is_omap1_8250(struct uart_8250_port *pt)
 228 {
 229         return 0;
 230 }
 231 static inline int is_omap1510_8250(struct uart_8250_port *pt)
 232 {
 233         return 0;
 234 }
 235 #endif
 236
 237 #ifdef CONFIG_SERIAL_8250_DMA
 238 extern int serial8250_tx_dma(struct uart_8250_port *);
 239 extern int serial8250_rx_dma(struct uart_8250_port *);
 240 extern void serial8250_rx_dma_flush(struct uart_8250_port *);
 241 extern int serial8250_request_dma(struct uart_8250_port *);
 242 extern void serial8250_release_dma(struct uart_8250_port *);
 243 #else
 244 static inline int serial8250_tx_dma(struct uart_8250_port *p)
 245 {
 246         return -1;
 247 }
 248 static inline int serial8250_rx_dma(struct uart_8250_port *p)
 249 {
 250         return -1;
 251 }
 252 static inline void serial8250_rx_dma_flush(struct uart_8250_port *p) { }
 253 static inline int serial8250_request_dma(struct uart_8250_port *p)
 254 {
 255         return -1;
 256 }
 257 static inline void serial8250_release_dma(struct uart_8250_port *p) { }
 258 #endif
 259
 260 static inline int ns16550a_goto_highspeed(struct uart_8250_port *up)
 261 {
 262         unsigned char status;
 263
 264         status = serial_in(up, 0x04); /* EXCR2 */
 265 #define PRESL(x) ((x) & 0x30)
 266         if (PRESL(status) == 0x10) {
 267                 /* already in high speed mode */
 268                 return 0;
 269         } else {
 270                 status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
 271                 status |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */
 272                 serial_out(up, 0x04, status);
 273         }
 274         return 1;
 275 }
 276
 277 static inline int serial_index(struct uart_port *port)
 278 {
 279         return port->minor - 64;
 280 }