arch/blackfin/mach-bf527/include/mach/bfin_serial_5xx.h

   1 /*
   2  * file:        include/asm-blackfin/mach-bf527/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_DISABLE_RTS(x) gpio_set_value(x->rts_pin, 1)
  58 #define UART_ENABLE_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 #if defined(CONFIG_BFIN_UART0_CTSRTS) || defined(CONFIG_BFIN_UART1_CTSRTS)
  63 # define CONFIG_SERIAL_BFIN_CTSRTS
  64
  65 # ifndef CONFIG_UART0_CTS_PIN
  66 #  define CONFIG_UART0_CTS_PIN -1
  67 # endif
  68
  69 # ifndef CONFIG_UART0_RTS_PIN
  70 #  define CONFIG_UART0_RTS_PIN -1
  71 # endif
  72
  73 # ifndef CONFIG_UART1_CTS_PIN
  74 #  define CONFIG_UART1_CTS_PIN -1
  75 # endif
  76
  77 # ifndef CONFIG_UART1_RTS_PIN
  78 #  define CONFIG_UART1_RTS_PIN -1
  79 # endif
  80 #endif
  81
  82 #define BFIN_UART_TX_FIFO_SIZE  2
  83
  84 /*
  85  * The pin configuration is different from schematic
  86  */
  87 struct bfin_serial_port {
  88         struct uart_port port;
  89         unsigned int old_status;
  90         int status_irq;
  91         unsigned int lsr;
  92 #ifdef CONFIG_SERIAL_BFIN_DMA
  93         int tx_done;
  94         int tx_count;
  95         struct circ_buf rx_dma_buf;
  96         struct timer_list rx_dma_timer;
  97         int rx_dma_nrows;
  98         unsigned int tx_dma_channel;
  99         unsigned int rx_dma_channel;
 100         struct work_struct tx_dma_workqueue;
 101 #endif
 102 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 103         struct timer_list cts_timer;
 104         int cts_pin;
 105         int rts_pin;
 106 #endif
 107 };
 108
 109 /* The hardware clears the LSR bits upon read, so we need to cache
 110  * some of the more fun bits in software so they don't get lost
 111  * when checking the LSR in other code paths (TX).
 112  */
 113 static inline unsigned int UART_GET_LSR(struct bfin_serial_port *uart)
 114 {
 115         unsigned int lsr = bfin_read16(uart->port.membase + OFFSET_LSR);
 116         uart->lsr |= (lsr & (BI|FE|PE|OE));
 117         return lsr | uart->lsr;
 118 }
 119
 120 static inline void UART_CLEAR_LSR(struct bfin_serial_port *uart)
 121 {
 122         uart->lsr = 0;
 123         bfin_write16(uart->port.membase + OFFSET_LSR, -1);
 124 }
 125
 126 struct bfin_serial_res {
 127         unsigned long uart_base_addr;
 128         int uart_irq;
 129         int uart_status_irq;
 130 #ifdef CONFIG_SERIAL_BFIN_DMA
 131         unsigned int uart_tx_dma_channel;
 132         unsigned int uart_rx_dma_channel;
 133 #endif
 134 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 135         int uart_cts_pin;
 136         int uart_rts_pin;
 137 #endif
 138 };
 139
 140 struct bfin_serial_res bfin_serial_resource[] = {
 141 #ifdef CONFIG_SERIAL_BFIN_UART0
 142         {
 143          0xFFC00400,
 144          IRQ_UART0_RX,
 145          IRQ_UART0_ERROR,
 146 #ifdef CONFIG_SERIAL_BFIN_DMA
 147          CH_UART0_TX,
 148          CH_UART0_RX,
 149 #endif
 150 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 151          CONFIG_UART0_CTS_PIN,
 152          CONFIG_UART0_RTS_PIN,
 153 #endif
 154          },
 155 #endif
 156 #ifdef CONFIG_SERIAL_BFIN_UART1
 157         {
 158          0xFFC02000,
 159          IRQ_UART1_RX,
 160          IRQ_UART1_ERROR,
 161 #ifdef CONFIG_SERIAL_BFIN_DMA
 162          CH_UART1_TX,
 163          CH_UART1_RX,
 164 #endif
 165 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 166          CONFIG_UART1_CTS_PIN,
 167          CONFIG_UART1_RTS_PIN,
 168 #endif
 169          },
 170 #endif
 171 };
 172
 173 #define DRIVER_NAME "bfin-uart"