2 * Blackfin Infra-red Driver
4 * Copyright 2006-2009 Analog Devices Inc.
6 * Enter bugs at http://blackfin.uclinux.org/
8 * Licensed under the GPL-2 or later.
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>
20 #include <net/irda/irda.h>
21 #include <net/irda/wrapper.h>
22 #include <net/irda/irda_device.h>
25 #include <asm/cacheflush.h>
27 #include <asm/portmux.h>
29 #ifdef CONFIG_SIR_BFIN_DMA
37 struct bfin_sir_port {
38 unsigned char __iomem *membase;
42 struct net_device *dev;
43 #ifdef CONFIG_SIR_BFIN_DMA
45 struct dma_rx_buf rx_dma_buf;
46 struct timer_list rx_dma_timer;
49 unsigned int tx_dma_channel;
50 unsigned int rx_dma_channel;
53 struct bfin_sir_port_res {
54 unsigned long base_addr;
56 unsigned int rx_dma_channel;
57 unsigned int tx_dma_channel;
60 struct bfin_sir_self {
61 struct bfin_sir_port *sir_port;
67 struct sk_buff *txskb;
68 struct sk_buff *rxskb;
69 struct net_device_stats stats;
71 struct irlap_cb *irlap;
77 struct work_struct work;
81 #define DRIVER_NAME "bfin_sir"
83 #define SIR_UART_GET_CHAR(port) bfin_read16((port)->membase + OFFSET_RBR)
84 #define SIR_UART_GET_DLL(port) bfin_read16((port)->membase + OFFSET_DLL)
85 #define SIR_UART_GET_DLH(port) bfin_read16((port)->membase + OFFSET_DLH)
86 #define SIR_UART_GET_LCR(port) bfin_read16((port)->membase + OFFSET_LCR)
87 #define SIR_UART_GET_GCTL(port) bfin_read16((port)->membase + OFFSET_GCTL)
89 #define SIR_UART_PUT_CHAR(port, v) bfin_write16(((port)->membase + OFFSET_THR), v)
90 #define SIR_UART_PUT_DLL(port, v) bfin_write16(((port)->membase + OFFSET_DLL), v)
91 #define SIR_UART_PUT_DLH(port, v) bfin_write16(((port)->membase + OFFSET_DLH), v)
92 #define SIR_UART_PUT_LCR(port, v) bfin_write16(((port)->membase + OFFSET_LCR), v)
93 #define SIR_UART_PUT_GCTL(port, v) bfin_write16(((port)->membase + OFFSET_GCTL), v)
96 #define SIR_UART_GET_LSR(port) bfin_read16((port)->membase + OFFSET_LSR)
97 #define SIR_UART_GET_IER(port) bfin_read16((port)->membase + OFFSET_IER_SET)
98 #define SIR_UART_SET_IER(port, v) bfin_write16(((port)->membase + OFFSET_IER_SET), v)
99 #define SIR_UART_CLEAR_IER(port, v) bfin_write16(((port)->membase + OFFSET_IER_CLEAR), v)
100 #define SIR_UART_PUT_LSR(port, v) bfin_write16(((port)->membase + OFFSET_LSR), v)
101 #define SIR_UART_CLEAR_LSR(port) bfin_write16(((port)->membase + OFFSET_LSR), -1)
103 #define SIR_UART_SET_DLAB(port)
104 #define SIR_UART_CLEAR_DLAB(port)
106 #define SIR_UART_ENABLE_INTS(port, v) SIR_UART_SET_IER(port, v)
107 #define SIR_UART_DISABLE_INTS(port) SIR_UART_CLEAR_IER(port, 0xF)
108 #define SIR_UART_STOP_TX(port) do { SIR_UART_PUT_LSR(port, TFI); SIR_UART_CLEAR_IER(port, ETBEI); } while (0)
109 #define SIR_UART_ENABLE_TX(port) do { SIR_UART_SET_IER(port, ETBEI); } while (0)
110 #define SIR_UART_STOP_RX(port) do { SIR_UART_CLEAR_IER(port, ERBFI); } while (0)
111 #define SIR_UART_ENABLE_RX(port) do { SIR_UART_SET_IER(port, ERBFI); } while (0)
114 #define SIR_UART_GET_IIR(port) bfin_read16((port)->membase + OFFSET_IIR)
115 #define SIR_UART_GET_IER(port) bfin_read16((port)->membase + OFFSET_IER)
116 #define SIR_UART_PUT_IER(port, v) bfin_write16(((port)->membase + OFFSET_IER), v)
118 #define SIR_UART_SET_DLAB(port) do { SIR_UART_PUT_LCR(port, SIR_UART_GET_LCR(port) | DLAB); } while (0)
119 #define SIR_UART_CLEAR_DLAB(port) do { SIR_UART_PUT_LCR(port, SIR_UART_GET_LCR(port) & ~DLAB); } while (0)
121 #define SIR_UART_ENABLE_INTS(port, v) SIR_UART_PUT_IER(port, v)
122 #define SIR_UART_DISABLE_INTS(port) SIR_UART_PUT_IER(port, 0)
123 #define SIR_UART_STOP_TX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) & ~ETBEI); } while (0)
124 #define SIR_UART_ENABLE_TX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) | ETBEI); } while (0)
125 #define SIR_UART_STOP_RX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) & ~ERBFI); } while (0)
126 #define SIR_UART_ENABLE_RX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) | ERBFI); } while (0)
128 static inline unsigned int SIR_UART_GET_LSR(struct bfin_sir_port *port)
130 unsigned int lsr = bfin_read16(port->membase + OFFSET_LSR);
131 port->lsr |= (lsr & (BI|FE|PE|OE));
132 return lsr | port->lsr;
135 static inline void SIR_UART_CLEAR_LSR(struct bfin_sir_port *port)
138 bfin_read16(port->membase + OFFSET_LSR);
142 static const unsigned short per[][4] = {
143 /* rx pin tx pin NULL uart_number */
144 {P_UART0_RX, P_UART0_TX, 0, 0},
145 {P_UART1_RX, P_UART1_TX, 0, 1},
146 {P_UART2_RX, P_UART2_TX, 0, 2},
147 {P_UART3_RX, P_UART3_TX, 0, 3},