drivers/tty/serial/pic32_uart.h

   1 /*
   2  * PIC32 Integrated Serial Driver.
   3  *
   4  * Copyright (C) 2015 Microchip Technology, Inc.
   5  *
   6  * Authors:
   7  *   Sorin-Andrei Pistirica <andrei.pistirica@microchip.com>
   8  *
   9  * Licensed under GPLv2 or later.
  10  */
  11 #ifndef __DT_PIC32_UART_H__
  12 #define __DT_PIC32_UART_H__
  13
  14 #define PIC32_UART_DFLT_BRATE           (9600)
  15 #define PIC32_UART_TX_FIFO_DEPTH        (8)
  16 #define PIC32_UART_RX_FIFO_DEPTH        (8)
  17
  18 #define PIC32_UART_MODE         0x00
  19 #define PIC32_UART_STA          0x10
  20 #define PIC32_UART_TX           0x20
  21 #define PIC32_UART_RX           0x30
  22 #define PIC32_UART_BRG          0x40
  23
  24 struct pic32_console_opt {
  25         int baud;
  26         int parity;
  27         int bits;
  28         int flow;
  29 };
  30
  31 /* struct pic32_sport - pic32 serial port descriptor
  32  * @port: uart port descriptor
  33  * @idx: port index
  34  * @irq_fault: virtual fault interrupt number
  35  * @irqflags_fault: flags related to fault irq
  36  * @irq_fault_name: irq fault name
  37  * @irq_rx: virtual rx interrupt number
  38  * @irqflags_rx: flags related to rx irq
  39  * @irq_rx_name: irq rx name
  40  * @irq_tx: virtual tx interrupt number
  41  * @irqflags_tx: : flags related to tx irq
  42  * @irq_tx_name: irq tx name
  43  * @cts_gpio: clear to send gpio
  44  * @dev: device descriptor
  45  **/
  46 struct pic32_sport {
  47         struct uart_port port;
  48         struct pic32_console_opt opt;
  49         int idx;
  50
  51         int irq_fault;
  52         int irqflags_fault;
  53         const char *irq_fault_name;
  54         int irq_rx;
  55         int irqflags_rx;
  56         const char *irq_rx_name;
  57         int irq_tx;
  58         int irqflags_tx;
  59         const char *irq_tx_name;
  60         u8 enable_tx_irq;
  61
  62         bool hw_flow_ctrl;
  63         int cts_gpio;
  64
  65         int ref_clk;
  66         struct clk *clk;
  67
  68         struct device *dev;
  69 };
  70 #define to_pic32_sport(c) container_of(c, struct pic32_sport, port)
  71 #define pic32_get_port(sport) (&sport->port)
  72 #define pic32_get_opt(sport) (&sport->opt)
  73 #define tx_irq_enabled(sport) (sport->enable_tx_irq)
  74
  75 static inline void pic32_uart_writel(struct pic32_sport *sport,
  76                                         u32 reg, u32 val)
  77 {
  78         struct uart_port *port = pic32_get_port(sport);
  79
  80         __raw_writel(val, port->membase + reg);
  81 }
  82
  83 static inline u32 pic32_uart_readl(struct pic32_sport *sport, u32 reg)
  84 {
  85         struct uart_port *port = pic32_get_port(sport);
  86
  87         return  __raw_readl(port->membase + reg);
  88 }
  89
  90 /* pic32 uart mode register bits */
  91 #define PIC32_UART_MODE_ON        BIT(15)
  92 #define PIC32_UART_MODE_FRZ       BIT(14)
  93 #define PIC32_UART_MODE_SIDL      BIT(13)
  94 #define PIC32_UART_MODE_IREN      BIT(12)
  95 #define PIC32_UART_MODE_RTSMD     BIT(11)
  96 #define PIC32_UART_MODE_RESV1     BIT(10)
  97 #define PIC32_UART_MODE_UEN1      BIT(9)
  98 #define PIC32_UART_MODE_UEN0      BIT(8)
  99 #define PIC32_UART_MODE_WAKE      BIT(7)
 100 #define PIC32_UART_MODE_LPBK      BIT(6)
 101 #define PIC32_UART_MODE_ABAUD     BIT(5)
 102 #define PIC32_UART_MODE_RXINV     BIT(4)
 103 #define PIC32_UART_MODE_BRGH      BIT(3)
 104 #define PIC32_UART_MODE_PDSEL1    BIT(2)
 105 #define PIC32_UART_MODE_PDSEL0    BIT(1)
 106 #define PIC32_UART_MODE_STSEL     BIT(0)
 107
 108 /* pic32 uart status register bits */
 109 #define PIC32_UART_STA_UTXISEL1   BIT(15)
 110 #define PIC32_UART_STA_UTXISEL0   BIT(14)
 111 #define PIC32_UART_STA_UTXINV     BIT(13)
 112 #define PIC32_UART_STA_URXEN      BIT(12)
 113 #define PIC32_UART_STA_UTXBRK     BIT(11)
 114 #define PIC32_UART_STA_UTXEN      BIT(10)
 115 #define PIC32_UART_STA_UTXBF      BIT(9)
 116 #define PIC32_UART_STA_TRMT       BIT(8)
 117 #define PIC32_UART_STA_URXISEL1   BIT(7)
 118 #define PIC32_UART_STA_URXISEL0   BIT(6)
 119 #define PIC32_UART_STA_ADDEN      BIT(5)
 120 #define PIC32_UART_STA_RIDLE      BIT(4)
 121 #define PIC32_UART_STA_PERR       BIT(3)
 122 #define PIC32_UART_STA_FERR       BIT(2)
 123 #define PIC32_UART_STA_OERR       BIT(1)
 124 #define PIC32_UART_STA_URXDA      BIT(0)
 125
 126 #endif /* __DT_PIC32_UART_H__ */