drivers/net/irda/bfin_sir.h

   1 /*
   2  * Blackfin Infra-red Driver
   3  *
   4  * Copyright 2006-2009 Analog Devices Inc.
   5  *
   6  * Enter bugs at http://blackfin.uclinux.org/
   7  *
   8  * Licensed under the GPL-2 or later.
   9  *
  10  */
  11
  12 #include <linux/serial.h>
  13 #include <linux/module.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/delay.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/slab.h>
  20
  21 #include <net/irda/irda.h>
  22 #include <net/irda/wrapper.h>
  23 #include <net/irda/irda_device.h>
  24
  25 #include <asm/irq.h>
  26 #include <asm/cacheflush.h>
  27 #include <asm/dma.h>
  28 #include <asm/portmux.h>
  29
  30 #ifdef CONFIG_SIR_BFIN_DMA
  31 struct dma_rx_buf {
  32         char *buf;
  33         int head;
  34         int tail;
  35 };
  36 #endif
  37
  38 struct bfin_sir_port {
  39         unsigned char __iomem   *membase;
  40         unsigned int            irq;
  41         unsigned int            lsr;
  42         unsigned long           clk;
  43         struct net_device       *dev;
  44 #ifdef CONFIG_SIR_BFIN_DMA
  45         int                     tx_done;
  46         struct dma_rx_buf       rx_dma_buf;
  47         struct timer_list       rx_dma_timer;
  48         int                     rx_dma_nrows;
  49 #endif
  50         unsigned int            tx_dma_channel;
  51         unsigned int            rx_dma_channel;
  52 };
  53
  54 struct bfin_sir_port_res {
  55         unsigned long   base_addr;
  56         int             irq;
  57         unsigned int    rx_dma_channel;
  58         unsigned int    tx_dma_channel;
  59 };
  60
  61 struct bfin_sir_self {
  62         struct bfin_sir_port    *sir_port;
  63         spinlock_t              lock;
  64         unsigned int            open;
  65         int                     speed;
  66         int                     newspeed;
  67
  68         struct sk_buff          *txskb;
  69         struct sk_buff          *rxskb;
  70         struct net_device_stats stats;
  71         struct device           *dev;
  72         struct irlap_cb         *irlap;
  73         struct qos_info         qos;
  74
  75         iobuff_t                tx_buff;
  76         iobuff_t                rx_buff;
  77
  78         struct work_struct      work;
  79         int                     mtt;
  80 };
  81
  82 #define DRIVER_NAME "bfin_sir"
  83
  84 #define SIR_UART_GET_CHAR(port)    bfin_read16((port)->membase + OFFSET_RBR)
  85 #define SIR_UART_GET_DLL(port)     bfin_read16((port)->membase + OFFSET_DLL)
  86 #define SIR_UART_GET_DLH(port)     bfin_read16((port)->membase + OFFSET_DLH)
  87 #define SIR_UART_GET_LCR(port)     bfin_read16((port)->membase + OFFSET_LCR)
  88 #define SIR_UART_GET_GCTL(port)    bfin_read16((port)->membase + OFFSET_GCTL)
  89
  90 #define SIR_UART_PUT_CHAR(port, v) bfin_write16(((port)->membase + OFFSET_THR), v)
  91 #define SIR_UART_PUT_DLL(port, v)  bfin_write16(((port)->membase + OFFSET_DLL), v)
  92 #define SIR_UART_PUT_DLH(port, v)  bfin_write16(((port)->membase + OFFSET_DLH), v)
  93 #define SIR_UART_PUT_LCR(port, v)  bfin_write16(((port)->membase + OFFSET_LCR), v)
  94 #define SIR_UART_PUT_GCTL(port, v) bfin_write16(((port)->membase + OFFSET_GCTL), v)
  95
  96 #ifdef CONFIG_BF54x
  97 #define SIR_UART_GET_LSR(port)     bfin_read16((port)->membase + OFFSET_LSR)
  98 #define SIR_UART_GET_IER(port)     bfin_read16((port)->membase + OFFSET_IER_SET)
  99 #define SIR_UART_SET_IER(port, v)  bfin_write16(((port)->membase + OFFSET_IER_SET), v)
 100 #define SIR_UART_CLEAR_IER(port, v) bfin_write16(((port)->membase + OFFSET_IER_CLEAR), v)
 101 #define SIR_UART_PUT_LSR(port, v)  bfin_write16(((port)->membase + OFFSET_LSR), v)
 102 #define SIR_UART_CLEAR_LSR(port)   bfin_write16(((port)->membase + OFFSET_LSR), -1)
 103
 104 #define SIR_UART_SET_DLAB(port)
 105 #define SIR_UART_CLEAR_DLAB(port)
 106
 107 #define SIR_UART_ENABLE_INTS(port, v) SIR_UART_SET_IER(port, v)
 108 #define SIR_UART_DISABLE_INTS(port)   SIR_UART_CLEAR_IER(port, 0xF)
 109 #define SIR_UART_STOP_TX(port)     do { SIR_UART_PUT_LSR(port, TFI); SIR_UART_CLEAR_IER(port, ETBEI); } while (0)
 110 #define SIR_UART_ENABLE_TX(port)   do { SIR_UART_SET_IER(port, ETBEI); } while (0)
 111 #define SIR_UART_STOP_RX(port)     do { SIR_UART_CLEAR_IER(port, ERBFI); } while (0)
 112 #define SIR_UART_ENABLE_RX(port)   do { SIR_UART_SET_IER(port, ERBFI); } while (0)
 113 #else
 114
 115 #define SIR_UART_GET_IIR(port)     bfin_read16((port)->membase + OFFSET_IIR)
 116 #define SIR_UART_GET_IER(port)     bfin_read16((port)->membase + OFFSET_IER)
 117 #define SIR_UART_PUT_IER(port, v)  bfin_write16(((port)->membase + OFFSET_IER), v)
 118
 119 #define SIR_UART_SET_DLAB(port)    do { SIR_UART_PUT_LCR(port, SIR_UART_GET_LCR(port) | DLAB); } while (0)
 120 #define SIR_UART_CLEAR_DLAB(port)  do { SIR_UART_PUT_LCR(port, SIR_UART_GET_LCR(port) & ~DLAB); } while (0)
 121
 122 #define SIR_UART_ENABLE_INTS(port, v) SIR_UART_PUT_IER(port, v)
 123 #define SIR_UART_DISABLE_INTS(port)   SIR_UART_PUT_IER(port, 0)
 124 #define SIR_UART_STOP_TX(port)     do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) & ~ETBEI); } while (0)
 125 #define SIR_UART_ENABLE_TX(port)   do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) | ETBEI); } while (0)
 126 #define SIR_UART_STOP_RX(port)     do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) & ~ERBFI); } while (0)
 127 #define SIR_UART_ENABLE_RX(port)   do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) | ERBFI); } while (0)
 128
 129 static inline unsigned int SIR_UART_GET_LSR(struct bfin_sir_port *port)
 130 {
 131         unsigned int lsr = bfin_read16(port->membase + OFFSET_LSR);
 132         port->lsr |= (lsr & (BI|FE|PE|OE));
 133         return lsr | port->lsr;
 134 }
 135
 136 static inline void SIR_UART_CLEAR_LSR(struct bfin_sir_port *port)
 137 {
 138         port->lsr = 0;
 139         bfin_read16(port->membase + OFFSET_LSR);
 140 }
 141 #endif
 142
 143 static const unsigned short per[][4] = {
 144         /* rx pin      tx pin     NULL  uart_number */
 145         {P_UART0_RX, P_UART0_TX,    0,    0},
 146         {P_UART1_RX, P_UART1_TX,    0,    1},
 147         {P_UART2_RX, P_UART2_TX,    0,    2},
 148         {P_UART3_RX, P_UART3_TX,    0,    3},
 149 };