drivers/tty/serial/pic32_uart.h

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * PIC32 Integrated Serial Driver.
   4  *
   5  * Copyright (C) 2015 Microchip Technology, Inc.
   6  *
   7  * Authors:
   8  *   Sorin-Andrei Pistirica <andrei.pistirica@microchip.com>
   9  */
  10 #ifndef __DT_PIC32_UART_H__
  11 #define __DT_PIC32_UART_H__
  12
  13 #define PIC32_UART_DFLT_BRATE           (9600)
  14 #define PIC32_UART_TX_FIFO_DEPTH        (8)
  15 #define PIC32_UART_RX_FIFO_DEPTH        (8)
  16
  17 #define PIC32_UART_MODE         0x00
  18 #define PIC32_UART_STA          0x10
  19 #define PIC32_UART_TX           0x20
  20 #define PIC32_UART_RX           0x30
  21 #define PIC32_UART_BRG          0x40
  22
  23 struct pic32_console_opt {
  24         int baud;
  25         int parity;
  26         int bits;
  27         int flow;
  28 };
  29
  30 /* struct pic32_sport - pic32 serial port descriptor
  31  * @port: uart port descriptor
  32  * @idx: port index
  33  * @irq_fault: virtual fault interrupt number
  34  * @irqflags_fault: flags related to fault irq
  35  * @irq_fault_name: irq fault name
  36  * @irq_rx: virtual rx interrupt number
  37  * @irqflags_rx: flags related to rx irq
  38  * @irq_rx_name: irq rx name
  39  * @irq_tx: virtual tx interrupt number
  40  * @irqflags_tx: : flags related to tx irq
  41  * @irq_tx_name: irq tx name
  42  * @cts_gpio: clear to send gpio
  43  * @dev: device descriptor
  44  **/
  45 struct pic32_sport {
  46         struct uart_port port;
  47         struct pic32_console_opt opt;
  48         int idx;
  49
  50         int irq_fault;
  51         int irqflags_fault;
  52         const char *irq_fault_name;
  53         int irq_rx;
  54         int irqflags_rx;
  55         const char *irq_rx_name;
  56         int irq_tx;
  57         int irqflags_tx;
  58         const char *irq_tx_name;
  59         u8 enable_tx_irq;
  60
  61         bool hw_flow_ctrl;
  62         int cts_gpio;
  63
  64         int ref_clk;
  65         struct clk *clk;
  66
  67         struct device *dev;
  68 };
  69 #define to_pic32_sport(c) container_of(c, struct pic32_sport, port)
  70 #define pic32_get_port(sport) (&sport->port)
  71 #define pic32_get_opt(sport) (&sport->opt)
  72 #define tx_irq_enabled(sport) (sport->enable_tx_irq)
  73
  74 static inline void pic32_uart_writel(struct pic32_sport *sport,
  75                                         u32 reg, u32 val)
  76 {
  77         struct uart_port *port = pic32_get_port(sport);
  78
  79         __raw_writel(val, port->membase + reg);
  80 }
  81
  82 static inline u32 pic32_uart_readl(struct pic32_sport *sport, u32 reg)
  83 {
  84         struct uart_port *port = pic32_get_port(sport);
  85
  86         return  __raw_readl(port->membase + reg);
  87 }
  88
  89 /* pic32 uart mode register bits */
  90 #define PIC32_UART_MODE_ON        BIT(15)
  91 #define PIC32_UART_MODE_FRZ       BIT(14)
  92 #define PIC32_UART_MODE_SIDL      BIT(13)
  93 #define PIC32_UART_MODE_IREN      BIT(12)
  94 #define PIC32_UART_MODE_RTSMD     BIT(11)
  95 #define PIC32_UART_MODE_RESV1     BIT(10)
  96 #define PIC32_UART_MODE_UEN1      BIT(9)
  97 #define PIC32_UART_MODE_UEN0      BIT(8)
  98 #define PIC32_UART_MODE_WAKE      BIT(7)
  99 #define PIC32_UART_MODE_LPBK      BIT(6)
 100 #define PIC32_UART_MODE_ABAUD     BIT(5)
 101 #define PIC32_UART_MODE_RXINV     BIT(4)
 102 #define PIC32_UART_MODE_BRGH      BIT(3)
 103 #define PIC32_UART_MODE_PDSEL1    BIT(2)
 104 #define PIC32_UART_MODE_PDSEL0    BIT(1)
 105 #define PIC32_UART_MODE_STSEL     BIT(0)
 106
 107 /* pic32 uart status register bits */
 108 #define PIC32_UART_STA_UTXISEL1   BIT(15)
 109 #define PIC32_UART_STA_UTXISEL0   BIT(14)
 110 #define PIC32_UART_STA_UTXINV     BIT(13)
 111 #define PIC32_UART_STA_URXEN      BIT(12)
 112 #define PIC32_UART_STA_UTXBRK     BIT(11)
 113 #define PIC32_UART_STA_UTXEN      BIT(10)
 114 #define PIC32_UART_STA_UTXBF      BIT(9)
 115 #define PIC32_UART_STA_TRMT       BIT(8)
 116 #define PIC32_UART_STA_URXISEL1   BIT(7)
 117 #define PIC32_UART_STA_URXISEL0   BIT(6)
 118 #define PIC32_UART_STA_ADDEN      BIT(5)
 119 #define PIC32_UART_STA_RIDLE      BIT(4)
 120 #define PIC32_UART_STA_PERR       BIT(3)
 121 #define PIC32_UART_STA_FERR       BIT(2)
 122 #define PIC32_UART_STA_OERR       BIT(1)
 123 #define PIC32_UART_STA_URXDA      BIT(0)
 124
 125 #endif /* __DT_PIC32_UART_H__ */