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>
19 #include <linux/slab.h>
21 #include <net/irda/irda.h>
22 #include <net/irda/wrapper.h>
23 #include <net/irda/irda_device.h>
26 #include <asm/cacheflush.h>
28 #include <asm/portmux.h>
29 /* Some transitional glue */
30 #include <linux/serial_core.h>
31 #include <linux/circ_buf.h>
32 #include <mach/bfin_serial_5xx.h>
35 #ifdef CONFIG_SIR_BFIN_DMA
43 struct bfin_sir_port {
44 unsigned char __iomem *membase;
48 struct net_device *dev;
49 #ifdef CONFIG_SIR_BFIN_DMA
51 struct dma_rx_buf rx_dma_buf;
52 struct timer_list rx_dma_timer;
55 unsigned int tx_dma_channel;
56 unsigned int rx_dma_channel;
59 struct bfin_sir_port_res {
60 unsigned long base_addr;
62 unsigned int rx_dma_channel;
63 unsigned int tx_dma_channel;
66 struct bfin_sir_self {
67 struct bfin_sir_port *sir_port;
73 struct sk_buff *txskb;
74 struct sk_buff *rxskb;
75 struct net_device_stats stats;
77 struct irlap_cb *irlap;
83 struct work_struct work;
87 #define DRIVER_NAME "bfin_sir"
89 #define SIR_UART_GET_CHAR(port) bfin_read16((port)->membase + OFFSET_RBR)
90 #define SIR_UART_GET_DLL(port) bfin_read16((port)->membase + OFFSET_DLL)
91 #define SIR_UART_GET_DLH(port) bfin_read16((port)->membase + OFFSET_DLH)
92 #define SIR_UART_GET_LCR(port) bfin_read16((port)->membase + OFFSET_LCR)
93 #define SIR_UART_GET_GCTL(port) bfin_read16((port)->membase + OFFSET_GCTL)
95 #define SIR_UART_PUT_CHAR(port, v) bfin_write16(((port)->membase + OFFSET_THR), v)
96 #define SIR_UART_PUT_DLL(port, v) bfin_write16(((port)->membase + OFFSET_DLL), v)
97 #define SIR_UART_PUT_DLH(port, v) bfin_write16(((port)->membase + OFFSET_DLH), v)
98 #define SIR_UART_PUT_LCR(port, v) bfin_write16(((port)->membase + OFFSET_LCR), v)
99 #define SIR_UART_PUT_GCTL(port, v) bfin_write16(((port)->membase + OFFSET_GCTL), v)
102 #define SIR_UART_GET_LSR(port) bfin_read16((port)->membase + OFFSET_LSR)
103 #define SIR_UART_GET_IER(port) bfin_read16((port)->membase + OFFSET_IER_SET)
104 #define SIR_UART_SET_IER(port, v) bfin_write16(((port)->membase + OFFSET_IER_SET), v)
105 #define SIR_UART_CLEAR_IER(port, v) bfin_write16(((port)->membase + OFFSET_IER_CLEAR), v)
106 #define SIR_UART_PUT_LSR(port, v) bfin_write16(((port)->membase + OFFSET_LSR), v)
107 #define SIR_UART_CLEAR_LSR(port) bfin_write16(((port)->membase + OFFSET_LSR), -1)
109 #define SIR_UART_SET_DLAB(port)
110 #define SIR_UART_CLEAR_DLAB(port)
112 #define SIR_UART_ENABLE_INTS(port, v) SIR_UART_SET_IER(port, v)
113 #define SIR_UART_DISABLE_INTS(port) SIR_UART_CLEAR_IER(port, 0xF)
114 #define SIR_UART_STOP_TX(port) do { SIR_UART_PUT_LSR(port, TFI); SIR_UART_CLEAR_IER(port, ETBEI); } while (0)
115 #define SIR_UART_ENABLE_TX(port) do { SIR_UART_SET_IER(port, ETBEI); } while (0)
116 #define SIR_UART_STOP_RX(port) do { SIR_UART_CLEAR_IER(port, ERBFI); } while (0)
117 #define SIR_UART_ENABLE_RX(port) do { SIR_UART_SET_IER(port, ERBFI); } while (0)
120 #define SIR_UART_GET_IIR(port) bfin_read16((port)->membase + OFFSET_IIR)
121 #define SIR_UART_GET_IER(port) bfin_read16((port)->membase + OFFSET_IER)
122 #define SIR_UART_PUT_IER(port, v) bfin_write16(((port)->membase + OFFSET_IER), v)
124 #define SIR_UART_SET_DLAB(port) do { SIR_UART_PUT_LCR(port, SIR_UART_GET_LCR(port) | DLAB); } while (0)
125 #define SIR_UART_CLEAR_DLAB(port) do { SIR_UART_PUT_LCR(port, SIR_UART_GET_LCR(port) & ~DLAB); } while (0)
127 #define SIR_UART_ENABLE_INTS(port, v) SIR_UART_PUT_IER(port, v)
128 #define SIR_UART_DISABLE_INTS(port) SIR_UART_PUT_IER(port, 0)
129 #define SIR_UART_STOP_TX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) & ~ETBEI); } while (0)
130 #define SIR_UART_ENABLE_TX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) | ETBEI); } while (0)
131 #define SIR_UART_STOP_RX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) & ~ERBFI); } while (0)
132 #define SIR_UART_ENABLE_RX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) | ERBFI); } while (0)
134 static inline unsigned int SIR_UART_GET_LSR(struct bfin_sir_port *port)
136 unsigned int lsr = bfin_read16(port->membase + OFFSET_LSR);
137 port->lsr |= (lsr & (BI|FE|PE|OE));
138 return lsr | port->lsr;
141 static inline void SIR_UART_CLEAR_LSR(struct bfin_sir_port *port)
144 bfin_read16(port->membase + OFFSET_LSR);
148 static const unsigned short per[][4] = {
149 /* rx pin tx pin NULL uart_number */
150 {P_UART0_RX, P_UART0_TX, 0, 0},
151 {P_UART1_RX, P_UART1_TX, 0, 1},
152 {P_UART2_RX, P_UART2_TX, 0, 2},
153 {P_UART3_RX, P_UART3_TX, 0, 3},