2 * file: include/asm-blackfin/mach-bf561/bfin_serial_5xx.h
8 * blackfin serial driver head file
14 * bugs: enter bugs at http://blackfin.uclinux.org/
16 * this program is free software; you can redistribute it and/or modify
17 * it under the terms of the gnu general public license as published by
18 * the free software foundation; either version 2, or (at your option)
21 * this program is distributed in the hope that it will be useful,
22 * but without any warranty; without even the implied warranty of
23 * merchantability or fitness for a particular purpose. see the
24 * gnu general public license for more details.
26 * you should have received a copy of the gnu general public license
27 * along with this program; see the file copying.
28 * if not, write to the free software foundation,
29 * 59 temple place - suite 330, boston, ma 02111-1307, usa.
32 #include <linux/serial.h>
34 #include <asm/portmux.h>
36 #define UART_GET_CHAR(uart) bfin_read16(((uart)->port.membase + OFFSET_RBR))
37 #define UART_GET_DLL(uart) bfin_read16(((uart)->port.membase + OFFSET_DLL))
38 #define UART_GET_IER(uart) bfin_read16(((uart)->port.membase + OFFSET_IER))
39 #define UART_GET_DLH(uart) bfin_read16(((uart)->port.membase + OFFSET_DLH))
40 #define UART_GET_IIR(uart) bfin_read16(((uart)->port.membase + OFFSET_IIR))
41 #define UART_GET_LCR(uart) bfin_read16(((uart)->port.membase + OFFSET_LCR))
42 #define UART_GET_GCTL(uart) bfin_read16(((uart)->port.membase + OFFSET_GCTL))
44 #define UART_PUT_CHAR(uart,v) bfin_write16(((uart)->port.membase + OFFSET_THR),v)
45 #define UART_PUT_DLL(uart,v) bfin_write16(((uart)->port.membase + OFFSET_DLL),v)
46 #define UART_PUT_IER(uart,v) bfin_write16(((uart)->port.membase + OFFSET_IER),v)
47 #define UART_PUT_DLH(uart,v) bfin_write16(((uart)->port.membase + OFFSET_DLH),v)
48 #define UART_PUT_LCR(uart,v) bfin_write16(((uart)->port.membase + OFFSET_LCR),v)
49 #define UART_PUT_GCTL(uart,v) bfin_write16(((uart)->port.membase + OFFSET_GCTL),v)
51 #ifdef CONFIG_BFIN_UART0_CTSRTS
52 # define CONFIG_SERIAL_BFIN_CTSRTS
53 # ifndef CONFIG_UART0_CTS_PIN
54 # define CONFIG_UART0_CTS_PIN -1
56 # ifndef CONFIG_UART0_RTS_PIN
57 # define CONFIG_UART0_RTS_PIN -1
61 struct bfin_serial_port
{
62 struct uart_port port
;
63 unsigned int old_status
;
65 #ifdef CONFIG_SERIAL_BFIN_DMA
68 struct circ_buf rx_dma_buf
;
69 struct timer_list rx_dma_timer
;
71 unsigned int tx_dma_channel
;
72 unsigned int rx_dma_channel
;
73 struct work_struct tx_dma_workqueue
;
76 unsigned int anomaly_threshold
;
79 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
80 struct work_struct cts_workqueue
;
86 /* The hardware clears the LSR bits upon read, so we need to cache
87 * some of the more fun bits in software so they don't get lost
88 * when checking the LSR in other code paths (TX).
90 static inline unsigned int UART_GET_LSR(struct bfin_serial_port
*uart
)
92 unsigned int lsr
= bfin_read16(uart
->port
.membase
+ OFFSET_LSR
);
93 uart
->lsr
|= (lsr
& (BI
|FE
|PE
|OE
));
94 return lsr
| uart
->lsr
;
97 static inline void UART_CLEAR_LSR(struct bfin_serial_port
*uart
)
100 bfin_write16(uart
->port
.membase
+ OFFSET_LSR
, -1);
103 struct bfin_serial_port bfin_serial_ports
[BFIN_UART_NR_PORTS
];
104 struct bfin_serial_res
{
105 unsigned long uart_base_addr
;
107 #ifdef CONFIG_SERIAL_BFIN_DMA
108 unsigned int uart_tx_dma_channel
;
109 unsigned int uart_rx_dma_channel
;
111 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
117 struct bfin_serial_res bfin_serial_resource
[] = {
121 #ifdef CONFIG_SERIAL_BFIN_DMA
125 #ifdef CONFIG_BFIN_UART0_CTSRTS
126 CONFIG_UART0_CTS_PIN
,
127 CONFIG_UART0_RTS_PIN
,
132 #define DRIVER_NAME "bfin-uart"
134 int nr_ports
= BFIN_UART_NR_PORTS
;
135 static void bfin_serial_hw_init(struct bfin_serial_port
*uart
)
138 #ifdef CONFIG_SERIAL_BFIN_UART0
139 peripheral_request(P_UART0_TX
, DRIVER_NAME
);
140 peripheral_request(P_UART0_RX
, DRIVER_NAME
);
143 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
144 if (uart
->cts_pin
>= 0) {
145 gpio_request(uart
->cts_pin
, DRIVER_NAME
);
146 gpio_direction_input(uart
->cts_pin
);
148 if (uart
->rts_pin
>= 0) {
149 gpio_request(uart
->rts_pin
, DRIVER_NAME
);
150 gpio_direction_input(uart
->rts_pin
, 0);