arch/sh/boards/se/7751/setup.c

   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
  12 #include <linux/init.h>
  13 #include <linux/irq.h>
  14 #include <linux/ide.h>
  15 #include <asm/io.h>
  16 #include <asm/se7751.h>
  17
  18 void heartbeat_7751se(void);
  19 void init_7751se_IRQ(void);
  20
  21 #ifdef CONFIG_SH_KGDB
  22 #include <asm/kgdb.h>
  23 static int kgdb_uart_setup(void);
  24 static struct kgdb_sermap kgdb_uart_sermap =
  25 { "ttyS", 0, kgdb_uart_setup, NULL };
  26 #endif
  27
  28 /*
  29  * Initialize the board
  30  */
  31 static void __init sh7751se_setup(char **cmdline_p)
  32 {
  33         /* Call init_smsc() replacement to set up SuperIO. */
  34         /* XXX: RTC setting comes here */
  35 #ifdef CONFIG_SH_KGDB
  36         kgdb_register_sermap(&kgdb_uart_sermap);
  37 #endif
  38 }
  39
  40 /*********************************************************************
  41  * Currently a hack (e.g. does not interact well w/serial.c, lots of *
  42  * hardcoded stuff) but may be useful if SCI/F needs debugging.      *
  43  * Mostly copied from x86 code (see files asm-i386/kgdb_local.h and  *
  44  * arch/i386/lib/kgdb_serial.c).                                     *
  45  *********************************************************************/
  46
  47 #ifdef CONFIG_SH_KGDB
  48 #include <linux/types.h>
  49 #include <linux/serial.h>
  50 #include <linux/serialP.h>
  51 #include <linux/serial_reg.h>
  52
  53 #define COM1_PORT 0x3f8  /* Base I/O address */
  54 #define COM1_IRQ  4      /* IRQ not used yet */
  55 #define COM2_PORT 0x2f8  /* Base I/O address */
  56 #define COM2_IRQ  3      /* IRQ not used yet */
  57
  58 #define SB_CLOCK 1843200 /* Serial baud clock */
  59 #define SB_BASE (SB_CLOCK/16)
  60 #define SB_MCR UART_MCR_OUT2 | UART_MCR_DTR | UART_MCR_RTS
  61
  62 struct uart_port {
  63         int base;
  64 };
  65 #define UART_NPORTS 2
  66 struct uart_port uart_ports[] = {
  67         { COM1_PORT },
  68         { COM2_PORT },
  69 };
  70 struct uart_port *kgdb_uart_port;
  71
  72 #define UART_IN(reg)    inb_p(kgdb_uart_port->base + reg)
  73 #define UART_OUT(reg,v) outb_p((v), kgdb_uart_port->base + reg)
  74
  75 /* Basic read/write functions for the UART */
  76 #define UART_LSR_RXCERR    (UART_LSR_BI | UART_LSR_FE | UART_LSR_PE)
  77 static int kgdb_uart_getchar(void)
  78 {
  79         int lsr;
  80         int c = -1;
  81
  82         while (c == -1) {
  83                 lsr = UART_IN(UART_LSR);
  84                 if (lsr & UART_LSR_DR)
  85                         c = UART_IN(UART_RX);
  86                 if ((lsr & UART_LSR_RXCERR))
  87                         c = -1;
  88         }
  89         return c;
  90 }
  91
  92 static void kgdb_uart_putchar(int c)
  93 {
  94         while ((UART_IN(UART_LSR) & UART_LSR_THRE) == 0)
  95                 ;
  96         UART_OUT(UART_TX, c);
  97 }
  98
  99 /*
 100  * Initialize UART to configured/requested values.
 101  * (But we don't interrupts yet, or interact w/serial.c)
 102  */
 103 static int kgdb_uart_setup(void)
 104 {
 105         int port;
 106         int lcr = 0;
 107         int bdiv = 0;
 108
 109         if (kgdb_portnum >= UART_NPORTS) {
 110                 KGDB_PRINTK("uart port %d invalid.\n", kgdb_portnum);
 111                 return -1;
 112         }
 113
 114         kgdb_uart_port = &uart_ports[kgdb_portnum];
 115
 116         /* Init sequence from gdb_hook_interrupt */
 117         UART_IN(UART_RX);
 118         UART_OUT(UART_IER, 0);
 119
 120         UART_IN(UART_RX);       /* Serial driver comments say */
 121         UART_IN(UART_IIR);      /* this clears interrupt regs */
 122         UART_IN(UART_MSR);
 123
 124         /* Figure basic LCR values */
 125         switch (kgdb_bits) {
 126         case '7':
 127                 lcr |= UART_LCR_WLEN7;
 128                 break;
 129         default: case '8':
 130                 lcr |= UART_LCR_WLEN8;
 131                 break;
 132         }
 133         switch (kgdb_parity) {
 134         case 'O':
 135                 lcr |= UART_LCR_PARITY;
 136                 break;
 137         case 'E':
 138                 lcr |= (UART_LCR_PARITY | UART_LCR_EPAR);
 139                 break;
 140         default: break;
 141         }
 142
 143         /* Figure the baud rate divisor */
 144         bdiv = (SB_BASE/kgdb_baud);
 145
 146         /* Set the baud rate and LCR values */
 147         UART_OUT(UART_LCR, (lcr | UART_LCR_DLAB));
 148         UART_OUT(UART_DLL, (bdiv & 0xff));
 149         UART_OUT(UART_DLM, ((bdiv >> 8) & 0xff));
 150         UART_OUT(UART_LCR, lcr);
 151
 152         /* Set the MCR */
 153         UART_OUT(UART_MCR, SB_MCR);
 154
 155         /* Turn off FIFOs for now */
 156         UART_OUT(UART_FCR, 0);
 157
 158         /* Setup complete: initialize function pointers */
 159         kgdb_getchar = kgdb_uart_getchar;
 160         kgdb_putchar = kgdb_uart_putchar;
 161
 162         return 0;
 163 }
 164 #endif /* CONFIG_SH_KGDB */
 165
 166
 167 /*
 168  * The Machine Vector
 169  */
 170
 171 struct sh_machine_vector mv_7751se __initmv = {
 172         .mv_name                = "7751 SolutionEngine",
 173         .mv_setup               = sh7751se_setup,
 174         .mv_nr_irqs             = 72,
 175
 176         .mv_inb                 = sh7751se_inb,
 177         .mv_inw                 = sh7751se_inw,
 178         .mv_inl                 = sh7751se_inl,
 179         .mv_outb                = sh7751se_outb,
 180         .mv_outw                = sh7751se_outw,
 181         .mv_outl                = sh7751se_outl,
 182
 183         .mv_inb_p               = sh7751se_inb_p,
 184         .mv_inw_p               = sh7751se_inw,
 185         .mv_inl_p               = sh7751se_inl,
 186         .mv_outb_p              = sh7751se_outb_p,
 187         .mv_outw_p              = sh7751se_outw,
 188         .mv_outl_p              = sh7751se_outl,
 189
 190         .mv_insl                = sh7751se_insl,
 191         .mv_outsl               = sh7751se_outsl,
 192
 193         .mv_init_irq            = init_7751se_IRQ,
 194 #ifdef CONFIG_HEARTBEAT
 195         .mv_heartbeat           = heartbeat_7751se,
 196 #endif
 197 };
 198 ALIAS_MV(7751se)