drivers/serial/cpm_uart/cpm_uart.h

   1 /*
   2  *  linux/drivers/serial/cpm_uart.h
   3  *
   4  *  Driver for CPM (SCC/SMC) serial ports
   5  *
   6  *  Copyright (C) 2004 Freescale Semiconductor, Inc.
   7  *
   8  *  2006 (c) MontaVista Software, Inc.
   9  *      Vitaly Bordug <vbordug@ru.mvista.com>
  10  *
  11  * This file is licensed under the terms of the GNU General Public License
  12  * version 2. This program is licensed "as is" without any warranty of any
  13  * kind, whether express or implied.
  14  *
  15  */
  16 #ifndef CPM_UART_H
  17 #define CPM_UART_H
  18
  19 #include <linux/platform_device.h>
  20 #include <linux/fs_uart_pd.h>
  21
  22 #if defined(CONFIG_CPM2)
  23 #include "cpm_uart_cpm2.h"
  24 #elif defined(CONFIG_8xx)
  25 #include "cpm_uart_cpm1.h"
  26 #endif
  27
  28 #define SERIAL_CPM_MAJOR        204
  29 #define SERIAL_CPM_MINOR        46
  30
  31 #define IS_SMC(pinfo)           (pinfo->flags & FLAG_SMC)
  32 #define IS_DISCARDING(pinfo)    (pinfo->flags & FLAG_DISCARDING)
  33 #define FLAG_DISCARDING 0x00000004      /* when set, don't discard */
  34 #define FLAG_SMC        0x00000002
  35 #define FLAG_CONSOLE    0x00000001
  36
  37 #define UART_SMC1       fsid_smc1_uart
  38 #define UART_SMC2       fsid_smc2_uart
  39 #define UART_SCC1       fsid_scc1_uart
  40 #define UART_SCC2       fsid_scc2_uart
  41 #define UART_SCC3       fsid_scc3_uart
  42 #define UART_SCC4       fsid_scc4_uart
  43
  44 #define UART_NR         fs_uart_nr
  45
  46 #define RX_NUM_FIFO     4
  47 #define RX_BUF_SIZE     32
  48 #define TX_NUM_FIFO     4
  49 #define TX_BUF_SIZE     32
  50
  51 #define SCC_WAIT_CLOSING 100
  52
  53 struct uart_cpm_port {
  54         struct uart_port        port;
  55         u16                     rx_nrfifos;
  56         u16                     rx_fifosize;
  57         u16                     tx_nrfifos;
  58         u16                     tx_fifosize;
  59         smc_t __iomem           *smcp;
  60         smc_uart_t __iomem      *smcup;
  61         scc_t __iomem           *sccp;
  62         scc_uart_t __iomem      *sccup;
  63         cbd_t __iomem           *rx_bd_base;
  64         cbd_t __iomem           *rx_cur;
  65         cbd_t __iomem           *tx_bd_base;
  66         cbd_t __iomem           *tx_cur;
  67         unsigned char           *tx_buf;
  68         unsigned char           *rx_buf;
  69         u32                     flags;
  70         void                    (*set_lineif)(struct uart_cpm_port *);
  71         u8                      brg;
  72         uint                     dp_addr;
  73         void                    *mem_addr;
  74         dma_addr_t               dma_addr;
  75         u32                     mem_size;
  76         /* helpers */
  77         int                      baud;
  78         int                      bits;
  79         /* Keep track of 'odd' SMC2 wirings */
  80         int                     is_portb;
  81         /* wait on close if needed */
  82         int                     wait_closing;
  83         /* value to combine with opcode to form cpm command */
  84         u32                     command;
  85 };
  86
  87 #ifndef CONFIG_PPC_CPM_NEW_BINDING
  88 extern int cpm_uart_port_map[UART_NR];
  89 #endif
  90 extern int cpm_uart_nr;
  91 extern struct uart_cpm_port cpm_uart_ports[UART_NR];
  92
  93 /* these are located in their respective files */
  94 void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd);
  95 void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
  96                                 struct device_node *np);
  97 void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram);
  98 int cpm_uart_init_portdesc(void);
  99 int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con);
 100 void cpm_uart_freebuf(struct uart_cpm_port *pinfo);
 101
 102 void smc1_lineif(struct uart_cpm_port *pinfo);
 103 void smc2_lineif(struct uart_cpm_port *pinfo);
 104 void scc1_lineif(struct uart_cpm_port *pinfo);
 105 void scc2_lineif(struct uart_cpm_port *pinfo);
 106 void scc3_lineif(struct uart_cpm_port *pinfo);
 107 void scc4_lineif(struct uart_cpm_port *pinfo);
 108
 109 /*
 110    virtual to phys transtalion
 111 */
 112 static inline unsigned long cpu2cpm_addr(void *addr,
 113                                          struct uart_cpm_port *pinfo)
 114 {
 115         int offset;
 116         u32 val = (u32)addr;
 117         u32 mem = (u32)pinfo->mem_addr;
 118         /* sane check */
 119         if (likely(val >= mem && val < mem + pinfo->mem_size)) {
 120                 offset = val - mem;
 121                 return pinfo->dma_addr + offset;
 122         }
 123         /* something nasty happened */
 124         BUG();
 125         return 0;
 126 }
 127
 128 static inline void *cpm2cpu_addr(unsigned long addr,
 129                                  struct uart_cpm_port *pinfo)
 130 {
 131         int offset;
 132         u32 val = addr;
 133         u32 dma = (u32)pinfo->dma_addr;
 134         /* sane check */
 135         if (likely(val >= dma && val < dma + pinfo->mem_size)) {
 136                 offset = val - dma;
 137                 return pinfo->mem_addr + offset;
 138         }
 139         /* something nasty happened */
 140         BUG();
 141         return NULL;
 142 }
 143
 144
 145 #endif /* CPM_UART_H */