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

   1 /*
   2  * Blackfin Infra-red Driver
   3  *
   4  * Copyright 2006-2008 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 <asm/dma.h>
  14 #include <asm/portmux.h>
  15
  16 #define SIR_UART_GET_CHAR(port)   bfin_read16((port)->membase + OFFSET_RBR)
  17 #define SIR_UART_GET_DLL(port)    bfin_read16((port)->membase + OFFSET_DLL)
  18 #define SIR_UART_GET_IER(port)    bfin_read16((port)->membase + OFFSET_IER)
  19 #define SIR_UART_GET_DLH(port)    bfin_read16((port)->membase + OFFSET_DLH)
  20 #define SIR_UART_GET_IIR(port)    bfin_read16((port)->membase + OFFSET_IIR)
  21 #define SIR_UART_GET_LCR(port)    bfin_read16((port)->membase + OFFSET_LCR)
  22 #define SIR_UART_GET_GCTL(port)   bfin_read16((port)->membase + OFFSET_GCTL)
  23
  24 #define SIR_UART_PUT_CHAR(port, v) bfin_write16(((port)->membase + OFFSET_THR), v)
  25 #define SIR_UART_PUT_DLL(port, v)  bfin_write16(((port)->membase + OFFSET_DLL), v)
  26 #define SIR_UART_PUT_IER(port, v)  bfin_write16(((port)->membase + OFFSET_IER), v)
  27 #define SIR_UART_PUT_DLH(port, v)  bfin_write16(((port)->membase + OFFSET_DLH), v)
  28 #define SIR_UART_PUT_LCR(port, v)  bfin_write16(((port)->membase + OFFSET_LCR), v)
  29 #define SIR_UART_PUT_GCTL(port, v) bfin_write16(((port)->membase + OFFSET_GCTL), v)
  30
  31 #ifdef CONFIG_SIR_BFIN_DMA
  32 struct dma_rx_buf {
  33         char *buf;
  34         int head;
  35         int tail;
  36         };
  37 #endif /* CONFIG_SIR_BFIN_DMA */
  38
  39 struct bfin_sir_port {
  40         unsigned char __iomem   *membase;
  41         unsigned int            irq;
  42         unsigned int            lsr;
  43         unsigned long           clk;
  44         struct net_device       *dev;
  45 #ifdef CONFIG_SIR_BFIN_DMA
  46         int                     tx_done;
  47         struct dma_rx_buf       rx_dma_buf;
  48         struct timer_list       rx_dma_timer;
  49         int                     rx_dma_nrows;
  50 #endif /* CONFIG_SIR_BFIN_DMA */
  51         unsigned int            tx_dma_channel;
  52         unsigned int            rx_dma_channel;
  53 };
  54
  55 struct bfin_sir_port sir_ports[BFIN_UART_NR_PORTS];
  56
  57 struct bfin_sir_port_res {
  58         unsigned long   base_addr;
  59         int             irq;
  60         unsigned int    rx_dma_channel;
  61         unsigned int    tx_dma_channel;
  62 };
  63
  64 struct bfin_sir_port_res bfin_sir_port_resource[] = {
  65 #ifdef CONFIG_BFIN_SIR0
  66         {
  67         0xFFC00400,
  68         IRQ_UART_RX,
  69         CH_UART_RX,
  70         CH_UART_TX,
  71         },
  72 #endif
  73 };
  74
  75 int nr_sirs = ARRAY_SIZE(bfin_sir_port_resource);
  76
  77 struct bfin_sir_self {
  78         struct bfin_sir_port    *sir_port;
  79         spinlock_t              lock;
  80         unsigned int            open;
  81         int                     speed;
  82         int                     newspeed;
  83
  84         struct sk_buff          *txskb;
  85         struct sk_buff          *rxskb;
  86         struct net_device_stats stats;
  87         struct device           *dev;
  88         struct irlap_cb         *irlap;
  89         struct qos_info         qos;
  90
  91         iobuff_t                tx_buff;
  92         iobuff_t                rx_buff;
  93
  94         struct work_struct      work;
  95         int                     mtt;
  96 };
  97
  98 static inline unsigned int SIR_UART_GET_LSR(struct bfin_sir_port *port)
  99 {
 100         unsigned int lsr = bfin_read16(port->membase + OFFSET_LSR);
 101         port->lsr |= (lsr & (BI|FE|PE|OE));
 102         return lsr | port->lsr;
 103 }
 104
 105 static inline void SIR_UART_CLEAR_LSR(struct bfin_sir_port *port)
 106 {
 107         port->lsr = 0;
 108         bfin_read16(port->membase + OFFSET_LSR);
 109 }
 110
 111 #define DRIVER_NAME "bfin_sir"
 112
 113 static int bfin_sir_hw_init(void)
 114 {
 115         int ret = -ENODEV;
 116 #ifdef CONFIG_BFIN_SIR0
 117         ret = peripheral_request(P_UART0_TX, DRIVER_NAME);
 118         if (ret)
 119                 return ret;
 120         ret = peripheral_request(P_UART0_RX, DRIVER_NAME);
 121         if (ret)
 122                 return ret;
 123 #endif
 124         return ret;
 125 }