drivers/tty/serial/cpm_uart.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  Driver for CPM (SCC/SMC) serial ports
   4  *
   5  *  Copyright (C) 2004 Freescale Semiconductor, Inc.
   6  *
   7  *  2006 (c) MontaVista Software, Inc.
   8  *      Vitaly Bordug <vbordug@ru.mvista.com>
   9  */
  10 #ifndef CPM_UART_H
  11 #define CPM_UART_H
  12
  13 #include <linux/platform_device.h>
  14
  15 struct gpio_desc;
  16
  17 #if defined(CONFIG_CPM2)
  18 #include "asm/cpm2.h"
  19 #elif defined(CONFIG_CPM1)
  20 #include "asm/cpm1.h"
  21 #endif
  22
  23 #define DPRAM_BASE      ((u8 __iomem *)cpm_muram_addr(0))
  24
  25 #define SERIAL_CPM_MAJOR        204
  26 #define SERIAL_CPM_MINOR        46
  27
  28 #define IS_SMC(pinfo)           (pinfo->flags & FLAG_SMC)
  29 #define FLAG_SMC        0x00000002
  30 #define FLAG_CONSOLE    0x00000001
  31
  32 #define UART_NR         6
  33
  34 #define RX_NUM_FIFO     4
  35 #define RX_BUF_SIZE     32
  36 #define TX_NUM_FIFO     4
  37 #define TX_BUF_SIZE     32
  38
  39 #define GPIO_CTS        0
  40 #define GPIO_RTS        1
  41 #define GPIO_DCD        2
  42 #define GPIO_DSR        3
  43 #define GPIO_DTR        4
  44 #define GPIO_RI         5
  45
  46 #define NUM_GPIOS       (GPIO_RI+1)
  47
  48 struct uart_cpm_port {
  49         struct uart_port        port;
  50         u16                     rx_nrfifos;
  51         u16                     rx_fifosize;
  52         u16                     tx_nrfifos;
  53         u16                     tx_fifosize;
  54         smc_t __iomem           *smcp;
  55         smc_uart_t __iomem      *smcup;
  56         scc_t __iomem           *sccp;
  57         scc_uart_t __iomem      *sccup;
  58         cbd_t __iomem           *rx_bd_base;
  59         cbd_t __iomem           *rx_cur;
  60         cbd_t __iomem           *tx_bd_base;
  61         cbd_t __iomem           *tx_cur;
  62         unsigned char           *tx_buf;
  63         unsigned char           *rx_buf;
  64         u32                     flags;
  65         struct clk              *clk;
  66         u8                      brg;
  67         uint                     dp_addr;
  68         void                    *mem_addr;
  69         dma_addr_t               dma_addr;
  70         u32                     mem_size;
  71         /* wait on close if needed */
  72         int                     wait_closing;
  73         /* value to combine with opcode to form cpm command */
  74         u32                     command;
  75         struct gpio_desc        *gpios[NUM_GPIOS];
  76 };
  77
  78 /*
  79    virtual to phys transtalion
  80 */
  81 static inline unsigned long cpu2cpm_addr(void *addr,
  82                                          struct uart_cpm_port *pinfo)
  83 {
  84         int offset;
  85         u32 val = (u32)addr;
  86         u32 mem = (u32)pinfo->mem_addr;
  87         /* sane check */
  88         if (likely(val >= mem && val < mem + pinfo->mem_size)) {
  89                 offset = val - mem;
  90                 return pinfo->dma_addr + offset;
  91         }
  92         /* something nasty happened */
  93         BUG();
  94         return 0;
  95 }
  96
  97 static inline void *cpm2cpu_addr(unsigned long addr,
  98                                  struct uart_cpm_port *pinfo)
  99 {
 100         int offset;
 101         u32 val = addr;
 102         u32 dma = (u32)pinfo->dma_addr;
 103         /* sane check */
 104         if (likely(val >= dma && val < dma + pinfo->mem_size)) {
 105                 offset = val - dma;
 106                 return pinfo->mem_addr + offset;
 107         }
 108         /* something nasty happened */
 109         BUG();
 110         return NULL;
 111 }
 112
 113
 114 #endif /* CPM_UART_H */