LXR linux/drivers/tty/serial/pic32

   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
  24struct 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 **/
  46struct 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
  75static 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
  83static 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__ */
 127