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   1 /*
   2  * linux/arch/sh/kernel/setup_7751se.c
   3  *
   4  * Copyright (C) 2000  Kazumoto Kojima
   5  *
   6  * Hitachi SolutionEngine Support.
   7  *
   8  * Modified for 7751 Solution Engine by
   9  * Ian da Silva and Jeremy Siegel, 2001.
  10  */
  11 #include <linux/init.h>
  12 #include <asm/machvec.h>
  13 #include <asm/se7751.h>
  14 #include <asm/io.h>
  15
  16 void heartbeat_7751se(void);
  17 void init_7751se_IRQ(void);
  18
  19 #ifdef CONFIG_SH_KGDB
  20 #include <asm/kgdb.h>
  21 static int kgdb_uart_setup(void);
  22 static struct kgdb_sermap kgdb_uart_sermap =
  23 { "ttyS", 0, kgdb_uart_setup, NULL };
  24 #endif
  25
  26 /*
  27  * Initialize the board
  28  */
  29 static void __init sh7751se_setup(char **cmdline_p)
  30 {
  31         /* Call init_smsc() replacement to set up SuperIO. */
  32         /* XXX: RTC setting comes here */
  33 #ifdef CONFIG_SH_KGDB
  34         kgdb_register_sermap(&kgdb_uart_sermap);
  35 #endif
  36 }
  37
  38 /*********************************************************************
  39  * Currently a hack (e.g. does not interact well w/serial.c, lots of *
  40  * hardcoded stuff) but may be useful if SCI/F needs debugging.      *
  41  * Mostly copied from x86 code (see files asm-i386/kgdb_local.h and  *
  42  * arch/i386/lib/kgdb_serial.c).                                     *
  43  *********************************************************************/
  44
  45 #ifdef CONFIG_SH_KGDB
  46 #include <linux/types.h>
  47 #include <linux/serial.h>
  48 #include <linux/serialP.h>
  49 #include <linux/serial_reg.h>
  50
  51 #define COM1_PORT 0x3f8  /* Base I/O address */
  52 #define COM1_IRQ  4      /* IRQ not used yet */
  53 #define COM2_PORT 0x2f8  /* Base I/O address */
  54 #define COM2_IRQ  3      /* IRQ not used yet */
  55
  56 #define SB_CLOCK 1843200 /* Serial baud clock */
  57 #define SB_BASE (SB_CLOCK/16)
  58 #define SB_MCR UART_MCR_OUT2 | UART_MCR_DTR | UART_MCR_RTS
  59
  60 struct uart_port {
  61         int base;
  62 };
  63 #define UART_NPORTS 2
  64 struct uart_port uart_ports[] = {
  65         { COM1_PORT },
  66         { COM2_PORT },
  67 };
  68 struct uart_port *kgdb_uart_port;
  69
  70 #define UART_IN(reg)    inb_p(kgdb_uart_port->base + reg)
  71 #define UART_OUT(reg,v) outb_p((v), kgdb_uart_port->base + reg)
  72
  73 /* Basic read/write functions for the UART */
  74 #define UART_LSR_RXCERR    (UART_LSR_BI | UART_LSR_FE | UART_LSR_PE)
  75 static int kgdb_uart_getchar(void)
  76 {
  77         int lsr;
  78         int c = -1;
  79
  80         while (c == -1) {
  81                 lsr = UART_IN(UART_LSR);
  82                 if (lsr & UART_LSR_DR)
  83                         c = UART_IN(UART_RX);
  84                 if ((lsr & UART_LSR_RXCERR))
  85                         c = -1;
  86         }
  87         return c;
  88 }
  89
  90 static void kgdb_uart_putchar(int c)
  91 {
  92         while ((UART_IN(UART_LSR) & UART_LSR_THRE) == 0)
  93                 ;
  94         UART_OUT(UART_TX, c);
  95 }
  96
  97 /*
  98  * Initialize UART to configured/requested values.
  99  * (But we don't interrupts yet, or interact w/serial.c)
 100  */
 101 static int kgdb_uart_setup(void)
 102 {
 103         int port;
 104         int lcr = 0;
 105         int bdiv = 0;
 106
 107         if (kgdb_portnum >= UART_NPORTS) {
 108                 KGDB_PRINTK("uart port %d invalid.\n", kgdb_portnum);
 109                 return -1;
 110         }
 111
 112         kgdb_uart_port = &uart_ports[kgdb_portnum];
 113
 114         /* Init sequence from gdb_hook_interrupt */
 115         UART_IN(UART_RX);
 116         UART_OUT(UART_IER, 0);
 117
 118         UART_IN(UART_RX);       /* Serial driver comments say */
 119         UART_IN(UART_IIR);      /* this clears interrupt regs */
 120         UART_IN(UART_MSR);
 121
 122         /* Figure basic LCR values */
 123         switch (kgdb_bits) {
 124         case '7':
 125                 lcr |= UART_LCR_WLEN7;
 126                 break;
 127         default: case '8':
 128                 lcr |= UART_LCR_WLEN8;
 129                 break;
 130         }
 131         switch (kgdb_parity) {
 132         case 'O':
 133                 lcr |= UART_LCR_PARITY;
 134                 break;
 135         case 'E':
 136                 lcr |= (UART_LCR_PARITY | UART_LCR_EPAR);
 137                 break;
 138         default: break;
 139         }
 140
 141         /* Figure the baud rate divisor */
 142         bdiv = (SB_BASE/kgdb_baud);
 143
 144         /* Set the baud rate and LCR values */
 145         UART_OUT(UART_LCR, (lcr | UART_LCR_DLAB));
 146         UART_OUT(UART_DLL, (bdiv & 0xff));
 147         UART_OUT(UART_DLM, ((bdiv >> 8) & 0xff));
 148         UART_OUT(UART_LCR, lcr);
 149
 150         /* Set the MCR */
 151         UART_OUT(UART_MCR, SB_MCR);
 152
 153         /* Turn off FIFOs for now */
 154         UART_OUT(UART_FCR, 0);
 155
 156         /* Setup complete: initialize function pointers */
 157         kgdb_getchar = kgdb_uart_getchar;
 158         kgdb_putchar = kgdb_uart_putchar;
 159
 160         return 0;
 161 }
 162 #endif /* CONFIG_SH_KGDB */
 163
 164
 165 /*
 166  * The Machine Vector
 167  */
 168
 169 struct sh_machine_vector mv_7751se __initmv = {
 170         .mv_name                = "7751 SolutionEngine",
 171         .mv_setup               = sh7751se_setup,
 172         .mv_nr_irqs             = 72,
 173
 174         .mv_inb                 = sh7751se_inb,
 175         .mv_inw                 = sh7751se_inw,
 176         .mv_inl                 = sh7751se_inl,
 177         .mv_outb                = sh7751se_outb,
 178         .mv_outw                = sh7751se_outw,
 179         .mv_outl                = sh7751se_outl,
 180
 181         .mv_inb_p               = sh7751se_inb_p,
 182         .mv_inw_p               = sh7751se_inw,
 183         .mv_inl_p               = sh7751se_inl,
 184         .mv_outb_p              = sh7751se_outb_p,
 185         .mv_outw_p              = sh7751se_outw,
 186         .mv_outl_p              = sh7751se_outl,
 187
 188         .mv_insl                = sh7751se_insl,
 189         .mv_outsl               = sh7751se_outsl,
 190
 191         .mv_init_irq            = init_7751se_IRQ,
 192 #ifdef CONFIG_HEARTBEAT
 193         .mv_heartbeat           = heartbeat_7751se,
 194 #endif
 195 };
 196 ALIAS_MV(7751se)