arch/blackfin/mach-bf533/include/mach/bfin_serial_5xx.h

   1 /*
   2  * file:        include/asm-blackfin/mach-bf533/bfin_serial_5xx.h
   3  * based on:
   4  * author:
   5  *
   6  * created:
   7  * description:
   8  *      blackfin serial driver head file
   9  * rev:
  10  *
  11  * modified:
  12  *
  13  *
  14  * bugs:         enter bugs at http://blackfin.uclinux.org/
  15  *
  16  * this program is free software; you can redistribute it and/or modify
  17  * it under the terms of the gnu general public license as published by
  18  * the free software foundation; either version 2, or (at your option)
  19  * any later version.
  20  *
  21  * this program is distributed in the hope that it will be useful,
  22  * but without any warranty; without even the implied warranty of
  23  * merchantability or fitness for a particular purpose.  see the
  24  * gnu general public license for more details.
  25  *
  26  * you should have received a copy of the gnu general public license
  27  * along with this program; see the file copying.
  28  * if not, write to the free software foundation,
  29  * 59 temple place - suite 330, boston, ma 02111-1307, usa.
  30  */
  31
  32 #include <linux/serial.h>
  33 #include <asm/dma.h>
  34 #include <asm/portmux.h>
  35
  36 #define UART_GET_CHAR(uart)     bfin_read16(((uart)->port.membase + OFFSET_RBR))
  37 #define UART_GET_DLL(uart)      bfin_read16(((uart)->port.membase + OFFSET_DLL))
  38 #define UART_GET_IER(uart)      bfin_read16(((uart)->port.membase + OFFSET_IER))
  39 #define UART_GET_DLH(uart)      bfin_read16(((uart)->port.membase + OFFSET_DLH))
  40 #define UART_GET_IIR(uart)      bfin_read16(((uart)->port.membase + OFFSET_IIR))
  41 #define UART_GET_LCR(uart)      bfin_read16(((uart)->port.membase + OFFSET_LCR))
  42 #define UART_GET_GCTL(uart)     bfin_read16(((uart)->port.membase + OFFSET_GCTL))
  43
  44 #define UART_PUT_CHAR(uart,v)   bfin_write16(((uart)->port.membase + OFFSET_THR),v)
  45 #define UART_PUT_DLL(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_DLL),v)
  46 #define UART_PUT_IER(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_IER),v)
  47 #define UART_SET_IER(uart,v)    UART_PUT_IER(uart, UART_GET_IER(uart) | (v))
  48 #define UART_CLEAR_IER(uart,v)  UART_PUT_IER(uart, UART_GET_IER(uart) & ~(v))
  49 #define UART_PUT_DLH(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_DLH),v)
  50 #define UART_PUT_LCR(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_LCR),v)
  51 #define UART_PUT_GCTL(uart,v)   bfin_write16(((uart)->port.membase + OFFSET_GCTL),v)
  52
  53 #define UART_SET_DLAB(uart)     do { UART_PUT_LCR(uart, UART_GET_LCR(uart) | DLAB); SSYNC(); } while (0)
  54 #define UART_CLEAR_DLAB(uart)   do { UART_PUT_LCR(uart, UART_GET_LCR(uart) & ~DLAB); SSYNC(); } while (0)
  55
  56 #define UART_GET_CTS(x) gpio_get_value(x->cts_pin)
  57 #define UART_SET_RTS(x) gpio_set_value(x->rts_pin, 1)
  58 #define UART_CLEAR_RTS(x) gpio_set_value(x->rts_pin, 0)
  59 #define UART_ENABLE_INTS(x, v) UART_PUT_IER(x, v)
  60 #define UART_DISABLE_INTS(x) UART_PUT_IER(x, 0)
  61
  62 #ifdef CONFIG_BFIN_UART0_CTSRTS
  63 # define CONFIG_SERIAL_BFIN_CTSRTS
  64 # ifndef CONFIG_UART0_CTS_PIN
  65 #  define CONFIG_UART0_CTS_PIN -1
  66 # endif
  67 # ifndef CONFIG_UART0_RTS_PIN
  68 #  define CONFIG_UART0_RTS_PIN -1
  69 # endif
  70 #endif
  71
  72 #define BFIN_UART_TX_FIFO_SIZE  2
  73
  74 struct bfin_serial_port {
  75         struct uart_port        port;
  76         unsigned int            old_status;
  77         unsigned int lsr;
  78 #ifdef CONFIG_SERIAL_BFIN_DMA
  79         int                     tx_done;
  80         int                     tx_count;
  81         struct circ_buf         rx_dma_buf;
  82         struct timer_list       rx_dma_timer;
  83         int                     rx_dma_nrows;
  84         unsigned int            tx_dma_channel;
  85         unsigned int            rx_dma_channel;
  86         struct work_struct      tx_dma_workqueue;
  87 #else
  88 # if ANOMALY_05000230
  89         unsigned int anomaly_threshold;
  90 # endif
  91 #endif
  92 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
  93         struct timer_list       cts_timer;
  94         int                     cts_pin;
  95         int                     rts_pin;
  96 #endif
  97 };
  98
  99 /* The hardware clears the LSR bits upon read, so we need to cache
 100  * some of the more fun bits in software so they don't get lost
 101  * when checking the LSR in other code paths (TX).
 102  */
 103 static inline unsigned int UART_GET_LSR(struct bfin_serial_port *uart)
 104 {
 105         unsigned int lsr = bfin_read16(uart->port.membase + OFFSET_LSR);
 106         uart->lsr |= (lsr & (BI|FE|PE|OE));
 107         return lsr | uart->lsr;
 108 }
 109
 110 static inline void UART_CLEAR_LSR(struct bfin_serial_port *uart)
 111 {
 112         uart->lsr = 0;
 113         bfin_write16(uart->port.membase + OFFSET_LSR, -1);
 114 }
 115
 116 struct bfin_serial_res {
 117         unsigned long   uart_base_addr;
 118         int             uart_irq;
 119 #ifdef CONFIG_SERIAL_BFIN_DMA
 120         unsigned int    uart_tx_dma_channel;
 121         unsigned int    uart_rx_dma_channel;
 122 #endif
 123 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 124         int             uart_cts_pin;
 125         int             uart_rts_pin;
 126 #endif
 127 };
 128
 129 struct bfin_serial_res bfin_serial_resource[] = {
 130         {
 131         0xFFC00400,
 132         IRQ_UART_RX,
 133 #ifdef CONFIG_SERIAL_BFIN_DMA
 134         CH_UART_TX,
 135         CH_UART_RX,
 136 #endif
 137 #ifdef CONFIG_BFIN_UART0_CTSRTS
 138         CONFIG_UART0_CTS_PIN,
 139         CONFIG_UART0_RTS_PIN,
 140 #endif
 141         }
 142 };
 143
 144 #define DRIVER_NAME "bfin-uart"
 145
 146 static void bfin_serial_hw_init(struct bfin_serial_port *uart)
 147 {
 148
 149 #ifdef CONFIG_SERIAL_BFIN_UART0
 150         peripheral_request(P_UART0_TX, DRIVER_NAME);
 151         peripheral_request(P_UART0_RX, DRIVER_NAME);
 152 #endif
 153
 154 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 155         if (uart->cts_pin >= 0) {
 156                 gpio_request(uart->cts_pin, DRIVER_NAME);
 157                 gpio_direction_input(uart->cts_pin);
 158         }
 159         if (uart->rts_pin >= 0) {
 160                 gpio_request(uart->rts_pin, DRIVER_NAME);
 161                 gpio_direction_input(uart->rts_pin, 0);
 162         }
 163 #endif
 164 }