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 #include <mach/bfin_serial_5xx.h>
  30 #undef DRIVER_NAME
  31
  32 #ifdef CONFIG_SIR_BFIN_DMA
  33 struct dma_rx_buf {
  34         char *buf;
  35         int head;
  36         int tail;
  37 };
  38 #endif
  39
  40 struct bfin_sir_port {
  41         unsigned char __iomem   *membase;
  42         unsigned int            irq;
  43         unsigned int            lsr;
  44         unsigned long           clk;
  45         struct net_device       *dev;
  46 #ifdef CONFIG_SIR_BFIN_DMA
  47         int                     tx_done;
  48         struct dma_rx_buf       rx_dma_buf;
  49         struct timer_list       rx_dma_timer;
  50         int                     rx_dma_nrows;
  51 #endif
  52         unsigned int            tx_dma_channel;
  53         unsigned int            rx_dma_channel;
  54 };
  55
  56 struct bfin_sir_port_res {
  57         unsigned long   base_addr;
  58         int             irq;
  59         unsigned int    rx_dma_channel;
  60         unsigned int    tx_dma_channel;
  61 };
  62
  63 struct bfin_sir_self {
  64         struct bfin_sir_port    *sir_port;
  65         spinlock_t              lock;
  66         unsigned int            open;
  67         int                     speed;
  68         int                     newspeed;
  69
  70         struct sk_buff          *txskb;
  71         struct sk_buff          *rxskb;
  72         struct net_device_stats stats;
  73         struct device           *dev;
  74         struct irlap_cb         *irlap;
  75         struct qos_info         qos;
  76
  77         iobuff_t                tx_buff;
  78         iobuff_t                rx_buff;
  79
  80         struct work_struct      work;
  81         int                     mtt;
  82 };
  83
  84 #define DRIVER_NAME "bfin_sir"
  85
  86 #define SIR_UART_GET_CHAR(port)    bfin_read16((port)->membase + OFFSET_RBR)
  87 #define SIR_UART_GET_DLL(port)     bfin_read16((port)->membase + OFFSET_DLL)
  88 #define SIR_UART_GET_DLH(port)     bfin_read16((port)->membase + OFFSET_DLH)
  89 #define SIR_UART_GET_LCR(port)     bfin_read16((port)->membase + OFFSET_LCR)
  90 #define SIR_UART_GET_GCTL(port)    bfin_read16((port)->membase + OFFSET_GCTL)
  91
  92 #define SIR_UART_PUT_CHAR(port, v) bfin_write16(((port)->membase + OFFSET_THR), v)
  93 #define SIR_UART_PUT_DLL(port, v)  bfin_write16(((port)->membase + OFFSET_DLL), v)
  94 #define SIR_UART_PUT_DLH(port, v)  bfin_write16(((port)->membase + OFFSET_DLH), v)
  95 #define SIR_UART_PUT_LCR(port, v)  bfin_write16(((port)->membase + OFFSET_LCR), v)
  96 #define SIR_UART_PUT_GCTL(port, v) bfin_write16(((port)->membase + OFFSET_GCTL), v)
  97
  98 #ifdef CONFIG_BF54x
  99 #define SIR_UART_GET_LSR(port)     bfin_read16((port)->membase + OFFSET_LSR)
 100 #define SIR_UART_GET_IER(port)     bfin_read16((port)->membase + OFFSET_IER_SET)
 101 #define SIR_UART_SET_IER(port, v)  bfin_write16(((port)->membase + OFFSET_IER_SET), v)
 102 #define SIR_UART_CLEAR_IER(port, v) bfin_write16(((port)->membase + OFFSET_IER_CLEAR), v)
 103 #define SIR_UART_PUT_LSR(port, v)  bfin_write16(((port)->membase + OFFSET_LSR), v)
 104 #define SIR_UART_CLEAR_LSR(port)   bfin_write16(((port)->membase + OFFSET_LSR), -1)
 105
 106 #define SIR_UART_SET_DLAB(port)
 107 #define SIR_UART_CLEAR_DLAB(port)
 108
 109 #define SIR_UART_ENABLE_INTS(port, v) SIR_UART_SET_IER(port, v)
 110 #define SIR_UART_DISABLE_INTS(port)   SIR_UART_CLEAR_IER(port, 0xF)
 111 #define SIR_UART_STOP_TX(port)     do { SIR_UART_PUT_LSR(port, TFI); SIR_UART_CLEAR_IER(port, ETBEI); } while (0)
 112 #define SIR_UART_ENABLE_TX(port)   do { SIR_UART_SET_IER(port, ETBEI); } while (0)
 113 #define SIR_UART_STOP_RX(port)     do { SIR_UART_CLEAR_IER(port, ERBFI); } while (0)
 114 #define SIR_UART_ENABLE_RX(port)   do { SIR_UART_SET_IER(port, ERBFI); } while (0)
 115 #else
 116
 117 #define SIR_UART_GET_IIR(port)     bfin_read16((port)->membase + OFFSET_IIR)
 118 #define SIR_UART_GET_IER(port)     bfin_read16((port)->membase + OFFSET_IER)
 119 #define SIR_UART_PUT_IER(port, v)  bfin_write16(((port)->membase + OFFSET_IER), v)
 120
 121 #define SIR_UART_SET_DLAB(port)    do { SIR_UART_PUT_LCR(port, SIR_UART_GET_LCR(port) | DLAB); } while (0)
 122 #define SIR_UART_CLEAR_DLAB(port)  do { SIR_UART_PUT_LCR(port, SIR_UART_GET_LCR(port) & ~DLAB); } while (0)
 123
 124 #define SIR_UART_ENABLE_INTS(port, v) SIR_UART_PUT_IER(port, v)
 125 #define SIR_UART_DISABLE_INTS(port)   SIR_UART_PUT_IER(port, 0)
 126 #define SIR_UART_STOP_TX(port)     do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) & ~ETBEI); } while (0)
 127 #define SIR_UART_ENABLE_TX(port)   do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) | ETBEI); } while (0)
 128 #define SIR_UART_STOP_RX(port)     do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) & ~ERBFI); } while (0)
 129 #define SIR_UART_ENABLE_RX(port)   do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) | ERBFI); } while (0)
 130
 131 static inline unsigned int SIR_UART_GET_LSR(struct bfin_sir_port *port)
 132 {
 133         unsigned int lsr = bfin_read16(port->membase + OFFSET_LSR);
 134         port->lsr |= (lsr & (BI|FE|PE|OE));
 135         return lsr | port->lsr;
 136 }
 137
 138 static inline void SIR_UART_CLEAR_LSR(struct bfin_sir_port *port)
 139 {
 140         port->lsr = 0;
 141         bfin_read16(port->membase + OFFSET_LSR);
 142 }
 143 #endif
 144
 145 static const unsigned short per[][4] = {
 146         /* rx pin      tx pin     NULL  uart_number */
 147         {P_UART0_RX, P_UART0_TX,    0,    0},
 148         {P_UART1_RX, P_UART1_TX,    0,    1},
 149         {P_UART2_RX, P_UART2_TX,    0,    2},
 150         {P_UART3_RX, P_UART3_TX,    0,    3},
 151 };