arch/sh/boards/overdrive/fpga.c

   1 /*
   2  * Copyright (C) 2000 David J. Mckay (david.mckay@st.com)
   3  *
   4  * May be copied or modified under the terms of the GNU General Public
   5  * License.  See linux/COPYING for more information.
   6  *
   7  * This file handles programming up the Altera Flex10K that interfaces to
   8  * the Galileo, and does the PS/2 keyboard and mouse
   9  *
  10  */
  11
  12
  13 #include <linux/config.h>
  14 #include <linux/kernel.h>
  15 #include <linux/smp.h>
  16 #include <linux/smp_lock.h>
  17 #include <linux/init.h>
  18 #include <linux/errno.h>
  19 #include <linux/pci.h>
  20 #include <linux/delay.h>
  21
  22
  23 #include <asm/overdriver/gt64111.h>
  24 #include <asm/overdrive/overdrive.h>
  25 #include <asm/overdrive/fpga.h>
  26
  27 #define FPGA_NotConfigHigh()  (*FPGA_ControlReg) = (*FPGA_ControlReg) | ENABLE_FPGA_BIT
  28 #define FPGA_NotConfigLow()   (*FPGA_ControlReg) = (*FPGA_ControlReg) & RESET_FPGA_MASK
  29
  30 /* I need to find out what (if any) the real delay factor here is */
  31 /* The delay is definately not critical */
  32 #define long_delay() {int i;for(i=0;i<10000;i++);}
  33 #define short_delay() {int i;for(i=0;i<100;i++);}
  34
  35 static void __init program_overdrive_fpga(const unsigned char *fpgacode,
  36                                           int size)
  37 {
  38         int timeout = 0;
  39         int i, j;
  40         unsigned char b;
  41         static volatile unsigned char *FPGA_ControlReg =
  42             (volatile unsigned char *) (OVERDRIVE_CTRL);
  43         static volatile unsigned char *FPGA_ProgramReg =
  44             (volatile unsigned char *) (FPGA_DCLK_ADDRESS);
  45
  46         printk("FPGA:  Commencing FPGA Programming\n");
  47
  48         /* The PCI reset but MUST be low when programming the FPGA !!! */
  49         b = (*FPGA_ControlReg) & RESET_PCI_MASK;
  50
  51         (*FPGA_ControlReg) = b;
  52
  53         /* Prepare FPGA to program */
  54
  55         FPGA_NotConfigHigh();
  56         long_delay();
  57
  58         FPGA_NotConfigLow();
  59         short_delay();
  60
  61         while ((*FPGA_ProgramReg & FPGA_NOT_STATUS) != 0) {
  62                 printk("FPGA:  Waiting for NotStatus to go Low ... \n");
  63         }
  64
  65         FPGA_NotConfigHigh();
  66
  67         /* Wait for FPGA "ready to be programmed" signal */
  68         printk("FPGA:  Waiting for NotStatus to go high (FPGA ready)... \n");
  69
  70         for (timeout = 0;
  71              (((*FPGA_ProgramReg & FPGA_NOT_STATUS) == 0)
  72               && (timeout < FPGA_TIMEOUT)); timeout++);
  73
  74         /* Check if timeout condition occured - i.e. an error */
  75
  76         if (timeout == FPGA_TIMEOUT) {
  77                 printk
  78                     ("FPGA:  Failed to program - Timeout waiting for notSTATUS to go high\n");
  79                 return;
  80         }
  81
  82         printk("FPGA:  Copying data to FPGA ... %d bytes\n", size);
  83
  84         /* Copy array to FPGA - bit at a time */
  85
  86         for (i = 0; i < size; i++) {
  87                 volatile unsigned w = 0;
  88
  89                 for (j = 0; j < 8; j++) {
  90                         *FPGA_ProgramReg = (fpgacode[i] >> j) & 0x01;
  91                         short_delay();
  92                 }
  93                 if ((i & 0x3ff) == 0) {
  94                         printk(".");
  95                 }
  96         }
  97
  98         /* Waiting for CONFDONE to go high - means the program is complete  */
  99
 100         for (timeout = 0;
 101              (((*FPGA_ProgramReg & FPGA_CONFDONE) == 0)
 102               && (timeout < FPGA_TIMEOUT)); timeout++) {
 103
 104                 *FPGA_ProgramReg = 0x0;
 105                 long_delay();
 106         }
 107
 108         if (timeout == FPGA_TIMEOUT) {
 109                 printk
 110                     ("FPGA:  Failed to program - Timeout waiting for CONFDONE to go high\n");
 111                 return;
 112         } else {                /* Clock another 10 times - gets the device into a working state      */
 113                 for (i = 0; i < 10; i++) {
 114                         *FPGA_ProgramReg = 0x0;
 115                         short_delay();
 116                 }
 117         }
 118
 119         printk("FPGA:  Programming complete\n");
 120 }
 121
 122
 123 static const unsigned char __init fpgacode[] = {
 124 #include "./overdrive.ttf"      /* Code from maxplus2 compiler */
 125         , 0, 0
 126 };
 127
 128
 129 int __init init_overdrive_fpga(void)
 130 {
 131         program_overdrive_fpga(fpgacode, sizeof(fpgacode));
 132
 133         return 0;
 134 }