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[Blackfin] serial driver: fix bug - cache the bits of the LSR on systems where the...
[~andy/linux] / include / asm-blackfin / mach-bf561 / bfin_serial_5xx.h
1 #include <linux/serial.h>
2 #include <asm/dma.h>
3 #include <asm/portmux.h>
4
5 #define NR_PORTS                1
6
7 #define OFFSET_THR              0x00    /* Transmit Holding register            */
8 #define OFFSET_RBR              0x00    /* Receive Buffer register              */
9 #define OFFSET_DLL              0x00    /* Divisor Latch (Low-Byte)             */
10 #define OFFSET_IER              0x04    /* Interrupt Enable Register            */
11 #define OFFSET_DLH              0x04    /* Divisor Latch (High-Byte)            */
12 #define OFFSET_IIR              0x08    /* Interrupt Identification Register    */
13 #define OFFSET_LCR              0x0C    /* Line Control Register                */
14 #define OFFSET_MCR              0x10    /* Modem Control Register               */
15 #define OFFSET_LSR              0x14    /* Line Status Register                 */
16 #define OFFSET_MSR              0x18    /* Modem Status Register                */
17 #define OFFSET_SCR              0x1C    /* SCR Scratch Register                 */
18 #define OFFSET_GCTL             0x24    /* Global Control Register              */
19
20 #define UART_GET_CHAR(uart)     bfin_read16(((uart)->port.membase + OFFSET_RBR))
21 #define UART_GET_DLL(uart)      bfin_read16(((uart)->port.membase + OFFSET_DLL))
22 #define UART_GET_IER(uart)      bfin_read16(((uart)->port.membase + OFFSET_IER))
23 #define UART_GET_DLH(uart)      bfin_read16(((uart)->port.membase + OFFSET_DLH))
24 #define UART_GET_IIR(uart)      bfin_read16(((uart)->port.membase + OFFSET_IIR))
25 #define UART_GET_LCR(uart)      bfin_read16(((uart)->port.membase + OFFSET_LCR))
26 #define UART_GET_GCTL(uart)     bfin_read16(((uart)->port.membase + OFFSET_GCTL))
27
28 #define UART_PUT_CHAR(uart,v)   bfin_write16(((uart)->port.membase + OFFSET_THR),v)
29 #define UART_PUT_DLL(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_DLL),v)
30 #define UART_PUT_IER(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_IER),v)
31 #define UART_PUT_DLH(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_DLH),v)
32 #define UART_PUT_LCR(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_LCR),v)
33 #define UART_PUT_GCTL(uart,v)   bfin_write16(((uart)->port.membase + OFFSET_GCTL),v)
34
35 #ifdef CONFIG_BFIN_UART0_CTSRTS
36 # define CONFIG_SERIAL_BFIN_CTSRTS
37 # ifndef CONFIG_UART0_CTS_PIN
38 #  define CONFIG_UART0_CTS_PIN -1
39 # endif
40 # ifndef CONFIG_UART0_RTS_PIN
41 #  define CONFIG_UART0_RTS_PIN -1
42 # endif
43 #endif
44
45 struct bfin_serial_port {
46         struct uart_port        port;
47         unsigned int            old_status;
48         unsigned int lsr;
49 #ifdef CONFIG_SERIAL_BFIN_DMA
50         int                     tx_done;
51         int                     tx_count;
52         struct circ_buf         rx_dma_buf;
53         struct timer_list       rx_dma_timer;
54         int                     rx_dma_nrows;
55         unsigned int            tx_dma_channel;
56         unsigned int            rx_dma_channel;
57         struct work_struct      tx_dma_workqueue;
58 #else
59         struct work_struct      cts_workqueue;
60 #endif
61 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
62         int                     cts_pin;
63         int                     rts_pin;
64 #endif
65 };
66
67 /* The hardware clears the LSR bits upon read, so we need to cache
68  * some of the more fun bits in software so they don't get lost
69  * when checking the LSR in other code paths (TX).
70  */
71 static inline unsigned int UART_GET_LSR(struct bfin_serial_port *uart)
72 {
73         unsigned int lsr = bfin_read16(uart->port.membase + OFFSET_LSR);
74         uart->lsr |= (lsr & (BI|FE|PE|OE));
75         return lsr | uart->lsr;
76 }
77
78 static inline void UART_CLEAR_LSR(struct bfin_serial_port *uart)
79 {
80         uart->lsr = 0;
81         bfin_write16(uart->port.membase + OFFSET_LSR, -1);
82 }
83
84 struct bfin_serial_port bfin_serial_ports[NR_PORTS];
85 struct bfin_serial_res {
86         unsigned long   uart_base_addr;
87         int             uart_irq;
88 #ifdef CONFIG_SERIAL_BFIN_DMA
89         unsigned int    uart_tx_dma_channel;
90         unsigned int    uart_rx_dma_channel;
91 #endif
92 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
93         int             uart_cts_pin;
94         int             uart_rts_pin;
95 #endif
96 };
97
98 struct bfin_serial_res bfin_serial_resource[] = {
99         {
100         0xFFC00400,
101         IRQ_UART_RX,
102 #ifdef CONFIG_SERIAL_BFIN_DMA
103         CH_UART_TX,
104         CH_UART_RX,
105 #endif
106 #ifdef CONFIG_BFIN_UART0_CTSRTS
107         CONFIG_UART0_CTS_PIN,
108         CONFIG_UART0_RTS_PIN,
109 #endif
110         }
111 };
112
113 #define DRIVER_NAME "bfin-uart"
114
115 int nr_ports = NR_PORTS;
116 static void bfin_serial_hw_init(struct bfin_serial_port *uart)
117 {
118
119 #ifdef CONFIG_SERIAL_BFIN_UART0
120         peripheral_request(P_UART0_TX, DRIVER_NAME);
121         peripheral_request(P_UART0_RX, DRIVER_NAME);
122 #endif
123
124 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
125         if (uart->cts_pin >= 0) {
126                 gpio_request(uart->cts_pin, DRIVER_NAME);
127                 gpio_direction_input(uart->cts_pin);
128         }
129         if (uart->rts_pin >= 0) {
130                 gpio_request(uart->rts_pin, DRIVER_NAME);
131                 gpio_direction_input(uart->rts_pin, 0);
132         }
133 #endif
134 }