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

   1 #include <linux/serial.h>
   2 #include <asm/dma.h>
   3 #include <asm/portmux.h>
   4
   5 #define NR_PORTS                1
   6
   7 #define OFFSET_THR              0x00    /* Transmit Holding register            */
   8 #define OFFSET_RBR              0x00    /* Receive Buffer register              */
   9 #define OFFSET_DLL              0x00    /* Divisor Latch (Low-Byte)             */
  10 #define OFFSET_IER              0x04    /* Interrupt Enable Register            */
  11 #define OFFSET_DLH              0x04    /* Divisor Latch (High-Byte)            */
  12 #define OFFSET_IIR              0x08    /* Interrupt Identification Register    */
  13 #define OFFSET_LCR              0x0C    /* Line Control Register                */
  14 #define OFFSET_MCR              0x10    /* Modem Control Register               */
  15 #define OFFSET_LSR              0x14    /* Line Status Register                 */
  16 #define OFFSET_MSR              0x18    /* Modem Status Register                */
  17 #define OFFSET_SCR              0x1C    /* SCR Scratch Register                 */
  18 #define OFFSET_GCTL             0x24    /* Global Control Register              */
  19
  20 #define UART_GET_CHAR(uart)     bfin_read16(((uart)->port.membase + OFFSET_RBR))
  21 #define UART_GET_DLL(uart)      bfin_read16(((uart)->port.membase + OFFSET_DLL))
  22 #define UART_GET_IER(uart)      bfin_read16(((uart)->port.membase + OFFSET_IER))
  23 #define UART_GET_DLH(uart)      bfin_read16(((uart)->port.membase + OFFSET_DLH))
  24 #define UART_GET_IIR(uart)      bfin_read16(((uart)->port.membase + OFFSET_IIR))
  25 #define UART_GET_LCR(uart)      bfin_read16(((uart)->port.membase + OFFSET_LCR))
  26 #define UART_GET_GCTL(uart)     bfin_read16(((uart)->port.membase + OFFSET_GCTL))
  27
  28 #define UART_PUT_CHAR(uart,v)   bfin_write16(((uart)->port.membase + OFFSET_THR),v)
  29 #define UART_PUT_DLL(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_DLL),v)
  30 #define UART_PUT_IER(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_IER),v)
  31 #define UART_PUT_DLH(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_DLH),v)
  32 #define UART_PUT_LCR(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_LCR),v)
  33 #define UART_PUT_GCTL(uart,v)   bfin_write16(((uart)->port.membase + OFFSET_GCTL),v)
  34
  35 #ifdef CONFIG_BFIN_UART0_CTSRTS
  36 # define CONFIG_SERIAL_BFIN_CTSRTS
  37 # ifndef CONFIG_UART0_CTS_PIN
  38 #  define CONFIG_UART0_CTS_PIN -1
  39 # endif
  40 # ifndef CONFIG_UART0_RTS_PIN
  41 #  define CONFIG_UART0_RTS_PIN -1
  42 # endif
  43 #endif
  44
  45 struct bfin_serial_port {
  46         struct uart_port        port;
  47         unsigned int            old_status;
  48         unsigned int lsr;
  49 #ifdef CONFIG_SERIAL_BFIN_DMA
  50         int                     tx_done;
  51         int                     tx_count;
  52         struct circ_buf         rx_dma_buf;
  53         struct timer_list       rx_dma_timer;
  54         int                     rx_dma_nrows;
  55         unsigned int            tx_dma_channel;
  56         unsigned int            rx_dma_channel;
  57         struct work_struct      tx_dma_workqueue;
  58 #else
  59 # if ANOMALY_05000230
  60         unsigned int anomaly_threshold;
  61 # endif
  62 #endif
  63 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
  64         struct work_struct      cts_workqueue;
  65         int                     cts_pin;
  66         int                     rts_pin;
  67 #endif
  68 };
  69
  70 /* The hardware clears the LSR bits upon read, so we need to cache
  71  * some of the more fun bits in software so they don't get lost
  72  * when checking the LSR in other code paths (TX).
  73  */
  74 static inline unsigned int UART_GET_LSR(struct bfin_serial_port *uart)
  75 {
  76         unsigned int lsr = bfin_read16(uart->port.membase + OFFSET_LSR);
  77         uart->lsr |= (lsr & (BI|FE|PE|OE));
  78         return lsr | uart->lsr;
  79 }
  80
  81 static inline void UART_CLEAR_LSR(struct bfin_serial_port *uart)
  82 {
  83         uart->lsr = 0;
  84         bfin_write16(uart->port.membase + OFFSET_LSR, -1);
  85 }
  86
  87 struct bfin_serial_port bfin_serial_ports[NR_PORTS];
  88 struct bfin_serial_res {
  89         unsigned long   uart_base_addr;
  90         int             uart_irq;
  91 #ifdef CONFIG_SERIAL_BFIN_DMA
  92         unsigned int    uart_tx_dma_channel;
  93         unsigned int    uart_rx_dma_channel;
  94 #endif
  95 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
  96         int             uart_cts_pin;
  97         int             uart_rts_pin;
  98 #endif
  99 };
 100
 101 struct bfin_serial_res bfin_serial_resource[] = {
 102         {
 103         0xFFC00400,
 104         IRQ_UART_RX,
 105 #ifdef CONFIG_SERIAL_BFIN_DMA
 106         CH_UART_TX,
 107         CH_UART_RX,
 108 #endif
 109 #ifdef CONFIG_BFIN_UART0_CTSRTS
 110         CONFIG_UART0_CTS_PIN,
 111         CONFIG_UART0_RTS_PIN,
 112 #endif
 113         }
 114 };
 115
 116 #define DRIVER_NAME "bfin-uart"
 117
 118 int nr_ports = NR_PORTS;
 119 static void bfin_serial_hw_init(struct bfin_serial_port *uart)
 120 {
 121
 122 #ifdef CONFIG_SERIAL_BFIN_UART0
 123         peripheral_request(P_UART0_TX, DRIVER_NAME);
 124         peripheral_request(P_UART0_RX, DRIVER_NAME);
 125 #endif
 126
 127 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 128         if (uart->cts_pin >= 0) {
 129                 gpio_request(uart->cts_pin, DRIVER_NAME);
 130                 gpio_direction_input(uart->cts_pin);
 131         }
 132         if (uart->rts_pin >= 0) {
 133                 gpio_request(uart->rts_pin, DRIVER_NAME);
 134                 gpio_direction_input(uart->rts_pin, 0);
 135         }
 136 #endif
 137 }