drivers/tty/serial/cpm_uart/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 #include <linux/fs_uart_pd.h>
  15
  16 struct gpio_desc;
  17
  18 #if defined(CONFIG_CPM2)
  19 #include "cpm_uart_cpm2.h"
  20 #elif defined(CONFIG_CPM1)
  21 #include "cpm_uart_cpm1.h"
  22 #endif
  23
  24 #define SERIAL_CPM_MAJOR        204
  25 #define SERIAL_CPM_MINOR        46
  26
  27 #define IS_SMC(pinfo)           (pinfo->flags & FLAG_SMC)
  28 #define IS_DISCARDING(pinfo)    (pinfo->flags & FLAG_DISCARDING)
  29 #define FLAG_DISCARDING 0x00000004      /* when set, don't discard */
  30 #define FLAG_SMC        0x00000002
  31 #define FLAG_CONSOLE    0x00000001
  32
  33 #define UART_SMC1       fsid_smc1_uart
  34 #define UART_SMC2       fsid_smc2_uart
  35 #define UART_SCC1       fsid_scc1_uart
  36 #define UART_SCC2       fsid_scc2_uart
  37 #define UART_SCC3       fsid_scc3_uart
  38 #define UART_SCC4       fsid_scc4_uart
  39
  40 #define UART_NR         fs_uart_nr
  41
  42 #define RX_NUM_FIFO     4
  43 #define RX_BUF_SIZE     32
  44 #define TX_NUM_FIFO     4
  45 #define TX_BUF_SIZE     32
  46
  47 #define SCC_WAIT_CLOSING 100
  48
  49 #define GPIO_CTS        0
  50 #define GPIO_RTS        1
  51 #define GPIO_DCD        2
  52 #define GPIO_DSR        3
  53 #define GPIO_DTR        4
  54 #define GPIO_RI         5
  55
  56 #define NUM_GPIOS       (GPIO_RI+1)
  57
  58 struct uart_cpm_port {
  59         struct uart_port        port;
  60         u16                     rx_nrfifos;
  61         u16                     rx_fifosize;
  62         u16                     tx_nrfifos;
  63         u16                     tx_fifosize;
  64         smc_t __iomem           *smcp;
  65         smc_uart_t __iomem      *smcup;
  66         scc_t __iomem           *sccp;
  67         scc_uart_t __iomem      *sccup;
  68         cbd_t __iomem           *rx_bd_base;
  69         cbd_t __iomem           *rx_cur;
  70         cbd_t __iomem           *tx_bd_base;
  71         cbd_t __iomem           *tx_cur;
  72         unsigned char           *tx_buf;
  73         unsigned char           *rx_buf;
  74         u32                     flags;
  75         struct clk              *clk;
  76         u8                      brg;
  77         uint                     dp_addr;
  78         void                    *mem_addr;
  79         dma_addr_t               dma_addr;
  80         u32                     mem_size;
  81         /* wait on close if needed */
  82         int                     wait_closing;
  83         /* value to combine with opcode to form cpm command */
  84         u32                     command;
  85         struct gpio_desc        *gpios[NUM_GPIOS];
  86 };
  87
  88 extern int cpm_uart_nr;
  89 extern struct uart_cpm_port cpm_uart_ports[UART_NR];
  90
  91 /* these are located in their respective files */
  92 void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd);
  93 void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
  94                                 struct device_node *np);
  95 void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram);
  96 int cpm_uart_init_portdesc(void);
  97 int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con);
  98 void cpm_uart_freebuf(struct uart_cpm_port *pinfo);
  99
 100 void smc1_lineif(struct uart_cpm_port *pinfo);
 101 void smc2_lineif(struct uart_cpm_port *pinfo);
 102 void scc1_lineif(struct uart_cpm_port *pinfo);
 103 void scc2_lineif(struct uart_cpm_port *pinfo);
 104 void scc3_lineif(struct uart_cpm_port *pinfo);
 105 void scc4_lineif(struct uart_cpm_port *pinfo);
 106
 107 /*
 108    virtual to phys transtalion
 109 */
 110 static inline unsigned long cpu2cpm_addr(void *addr,
 111                                          struct uart_cpm_port *pinfo)
 112 {
 113         int offset;
 114         u32 val = (u32)addr;
 115         u32 mem = (u32)pinfo->mem_addr;
 116         /* sane check */
 117         if (likely(val >= mem && val < mem + pinfo->mem_size)) {
 118                 offset = val - mem;
 119                 return pinfo->dma_addr + offset;
 120         }
 121         /* something nasty happened */
 122         BUG();
 123         return 0;
 124 }
 125
 126 static inline void *cpm2cpu_addr(unsigned long addr,
 127                                  struct uart_cpm_port *pinfo)
 128 {
 129         int offset;
 130         u32 val = addr;
 131         u32 dma = (u32)pinfo->dma_addr;
 132         /* sane check */
 133         if (likely(val >= dma && val < dma + pinfo->mem_size)) {
 134                 offset = val - dma;
 135                 return pinfo->mem_addr + offset;
 136         }
 137         /* something nasty happened */
 138         BUG();
 139         return NULL;
 140 }
 141
 142
 143 #endif /* CPM_UART_H */