drivers/serial/serial_xuartlite.c

   1 /*
   2  * (C) Copyright 2008-2011 Michal Simek <monstr@monstr.eu>
   3  * Clean driver and add xilinx constant from header file
   4  *
   5  * (C) Copyright 2004 Atmark Techno, Inc.
   6  * Yasushi SHOJI <yashi@atmark-techno.com>
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <config.h>
  28 #include <common.h>
  29 #include <asm/io.h>
  30 #include <linux/compiler.h>
  31 #include <serial.h>
  32
  33 #define SR_TX_FIFO_FULL         0x08 /* transmit FIFO full */
  34 #define SR_RX_FIFO_VALID_DATA   0x01 /* data in receive FIFO */
  35 #define SR_RX_FIFO_FULL         0x02 /* receive FIFO full */
  36
  37 struct uartlite {
  38         unsigned int rx_fifo;
  39         unsigned int tx_fifo;
  40         unsigned int status;
  41 };
  42
  43 static struct uartlite *userial_ports[4] = {
  44 #ifdef XILINX_UARTLITE_BASEADDR
  45         [0] = (struct uartlite *)XILINX_UARTLITE_BASEADDR,
  46 #endif
  47 #ifdef XILINX_UARTLITE_BASEADDR1
  48         [1] = (struct uartlite *)XILINX_UARTLITE_BASEADDR1,
  49 #endif
  50 #ifdef XILINX_UARTLITE_BASEADDR2
  51         [2] = (struct uartlite *)XILINX_UARTLITE_BASEADDR2,
  52 #endif
  53 #ifdef XILINX_UARTLITE_BASEADDR3
  54         [3] = (struct uartlite *)XILINX_UARTLITE_BASEADDR3
  55 #endif
  56 };
  57
  58 void uartlite_serial_putc(const char c, const int port)
  59 {
  60         struct uartlite *regs = userial_ports[port];
  61
  62         if (c == '\n')
  63                 uartlite_serial_putc('\r', port);
  64
  65         while (in_be32(&regs->status) & SR_TX_FIFO_FULL)
  66                 ;
  67         out_be32(&regs->tx_fifo, c & 0xff);
  68 }
  69
  70 void uartlite_serial_puts(const char *s, const int port)
  71 {
  72         while (*s)
  73                 uartlite_serial_putc(*s++, port);
  74 }
  75
  76 int uartlite_serial_getc(const int port)
  77 {
  78         struct uartlite *regs = userial_ports[port];
  79
  80         while (!(in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA))
  81                 ;
  82         return in_be32(&regs->rx_fifo) & 0xff;
  83 }
  84
  85 int uartlite_serial_tstc(const int port)
  86 {
  87         struct uartlite *regs = userial_ports[port];
  88
  89         return in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA;
  90 }
  91
  92 static int uartlite_serial_init(const int port)
  93 {
  94         if (userial_ports[port])
  95                 return 0;
  96         return -1;
  97 }
  98
  99 /* Multi serial device functions */
 100 #define DECLARE_ESERIAL_FUNCTIONS(port) \
 101         int userial##port##_init(void) \
 102                                 { return uartlite_serial_init(port); } \
 103         void userial##port##_setbrg(void) {} \
 104         int userial##port##_getc(void) \
 105                                 { return uartlite_serial_getc(port); } \
 106         int userial##port##_tstc(void) \
 107                                 { return uartlite_serial_tstc(port); } \
 108         void userial##port##_putc(const char c) \
 109                                 { uartlite_serial_putc(c, port); } \
 110         void userial##port##_puts(const char *s) \
 111                                 { uartlite_serial_puts(s, port); }
 112
 113 /* Serial device descriptor */
 114 #define INIT_ESERIAL_STRUCTURE(port, __name) {  \
 115         .name   = __name,                       \
 116         .start  = userial##port##_init,         \
 117         .stop   = NULL,                         \
 118         .setbrg = userial##port##_setbrg,       \
 119         .getc   = userial##port##_getc,         \
 120         .tstc   = userial##port##_tstc,         \
 121         .putc   = userial##port##_putc,         \
 122         .puts   = userial##port##_puts,         \
 123 }
 124
 125 DECLARE_ESERIAL_FUNCTIONS(0);
 126 struct serial_device uartlite_serial0_device =
 127         INIT_ESERIAL_STRUCTURE(0, "ttyUL0");
 128 DECLARE_ESERIAL_FUNCTIONS(1);
 129 struct serial_device uartlite_serial1_device =
 130         INIT_ESERIAL_STRUCTURE(1, "ttyUL1");
 131 DECLARE_ESERIAL_FUNCTIONS(2);
 132 struct serial_device uartlite_serial2_device =
 133         INIT_ESERIAL_STRUCTURE(2, "ttyUL2");
 134 DECLARE_ESERIAL_FUNCTIONS(3);
 135 struct serial_device uartlite_serial3_device =
 136         INIT_ESERIAL_STRUCTURE(3, "ttyUL3");
 137
 138 __weak struct serial_device *default_serial_console(void)
 139 {
 140         if (userial_ports[0])
 141                 return &uartlite_serial0_device;
 142         if (userial_ports[1])
 143                 return &uartlite_serial1_device;
 144         if (userial_ports[2])
 145                 return &uartlite_serial2_device;
 146         if (userial_ports[3])
 147                 return &uartlite_serial3_device;
 148
 149         return NULL;
 150 }
 151
 152 void uartlite_serial_initialize(void)
 153 {
 154 #ifdef XILINX_UARTLITE_BASEADDR
 155         serial_register(&uartlite_serial0_device);
 156 #endif /* XILINX_UARTLITE_BASEADDR */
 157 #ifdef XILINX_UARTLITE_BASEADDR1
 158         serial_register(&uartlite_serial1_device);
 159 #endif /* XILINX_UARTLITE_BASEADDR1 */
 160 #ifdef XILINX_UARTLITE_BASEADDR2
 161         serial_register(&uartlite_serial2_device);
 162 #endif /* XILINX_UARTLITE_BASEADDR2 */
 163 #ifdef XILINX_UARTLITE_BASEADDR3
 164         serial_register(&uartlite_serial3_device);
 165 #endif /* XILINX_UARTLITE_BASEADDR3 */
 166 }