arch/blackfin/mach-bf518/include/mach/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_UART0_RX,
  69         CH_UART0_RX,
  70         CH_UART0_TX,
  71         },
  72 #endif
  73 #ifdef CONFIG_BFIN_SIR1
  74         {
  75         0xFFC02000,
  76         IRQ_UART1_RX,
  77         CH_UART1_RX,
  78         CH_UART1_TX,
  79         },
  80 #endif
  81 };
  82
  83 int nr_sirs = ARRAY_SIZE(bfin_sir_port_resource);
  84
  85 struct bfin_sir_self {
  86         struct bfin_sir_port    *sir_port;
  87         spinlock_t              lock;
  88         unsigned int            open;
  89         int                     speed;
  90         int                     newspeed;
  91
  92         struct sk_buff          *txskb;
  93         struct sk_buff          *rxskb;
  94         struct net_device_stats stats;
  95         struct device           *dev;
  96         struct irlap_cb         *irlap;
  97         struct qos_info         qos;
  98
  99         iobuff_t                tx_buff;
 100         iobuff_t                rx_buff;
 101
 102         struct work_struct      work;
 103         int                     mtt;
 104 };
 105
 106 static inline unsigned int SIR_UART_GET_LSR(struct bfin_sir_port *port)
 107 {
 108         unsigned int lsr = bfin_read16(port->membase + OFFSET_LSR);
 109         port->lsr |= (lsr & (BI|FE|PE|OE));
 110         return lsr | port->lsr;
 111 }
 112
 113 static inline void SIR_UART_CLEAR_LSR(struct bfin_sir_port *port)
 114 {
 115         port->lsr = 0;
 116         bfin_read16(port->membase + OFFSET_LSR);
 117 }
 118
 119 #define DRIVER_NAME "bfin_sir"
 120
 121 static int bfin_sir_hw_init(void)
 122 {
 123         int ret = -ENODEV;
 124 #ifdef CONFIG_BFIN_SIR0
 125         ret = peripheral_request(P_UART0_TX, DRIVER_NAME);
 126         if (ret)
 127                 return ret;
 128         ret = peripheral_request(P_UART0_RX, DRIVER_NAME);
 129         if (ret)
 130                 return ret;
 131 #endif
 132
 133 #ifdef CONFIG_BFIN_SIR1
 134         ret = peripheral_request(P_UART1_TX, DRIVER_NAME);
 135         if (ret)
 136                 return ret;
 137         ret = peripheral_request(P_UART1_RX, DRIVER_NAME);
 138         if (ret)
 139                 return ret;
 140 #endif
 141         return ret;
 142 }