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   1 /*
   2  * arch/arm/mach-ns9xxx/board-a9m9750dev.c
   3  *
   4  * Copyright (C) 2006,2007 by Digi International Inc.
   5  * All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  */
  11 #include <linux/irq.h>
  12
  13 #include <asm/mach/map.h>
  14 #include <asm/gpio.h>
  15
  16 #include <mach/board.h>
  17 #include <mach/processor-ns9360.h>
  18 #include <mach/regs-sys-ns9360.h>
  19 #include <mach/regs-mem.h>
  20 #include <mach/regs-bbu.h>
  21 #include <mach/regs-board-a9m9750dev.h>
  22
  23 #include "board-a9m9750dev.h"
  24
  25 static struct map_desc board_a9m9750dev_io_desc[] __initdata = {
  26         { /* FPGA on CS0 */
  27                 .virtual = io_p2v(NS9XXX_CSxSTAT_PHYS(0)),
  28                 .pfn = __phys_to_pfn(NS9XXX_CSxSTAT_PHYS(0)),
  29                 .length = NS9XXX_CS0STAT_LENGTH,
  30                 .type = MT_DEVICE,
  31         },
  32 };
  33
  34 void __init board_a9m9750dev_map_io(void)
  35 {
  36         iotable_init(board_a9m9750dev_io_desc,
  37                      ARRAY_SIZE(board_a9m9750dev_io_desc));
  38 }
  39
  40 static void a9m9750dev_fpga_ack_irq(unsigned int irq)
  41 {
  42         /* nothing */
  43 }
  44
  45 static void a9m9750dev_fpga_mask_irq(unsigned int irq)
  46 {
  47         u8 ier;
  48
  49         ier = __raw_readb(FPGA_IER);
  50
  51         ier &= ~(1 << (irq - FPGA_IRQ(0)));
  52
  53         __raw_writeb(ier, FPGA_IER);
  54 }
  55
  56 static void a9m9750dev_fpga_maskack_irq(unsigned int irq)
  57 {
  58         a9m9750dev_fpga_mask_irq(irq);
  59         a9m9750dev_fpga_ack_irq(irq);
  60 }
  61
  62 static void a9m9750dev_fpga_unmask_irq(unsigned int irq)
  63 {
  64         u8 ier;
  65
  66         ier = __raw_readb(FPGA_IER);
  67
  68         ier |= 1 << (irq - FPGA_IRQ(0));
  69
  70         __raw_writeb(ier, FPGA_IER);
  71 }
  72
  73 static struct irq_chip a9m9750dev_fpga_chip = {
  74         .ack            = a9m9750dev_fpga_ack_irq,
  75         .mask           = a9m9750dev_fpga_mask_irq,
  76         .mask_ack       = a9m9750dev_fpga_maskack_irq,
  77         .unmask         = a9m9750dev_fpga_unmask_irq,
  78 };
  79
  80 static void a9m9750dev_fpga_demux_handler(unsigned int irq,
  81                 struct irq_desc *desc)
  82 {
  83         u8 stat = __raw_readb(FPGA_ISR);
  84
  85         desc->chip->mask_ack(irq);
  86
  87         while (stat != 0) {
  88                 int irqno = fls(stat) - 1;
  89                 struct irq_desc *fpgadesc;
  90
  91                 stat &= ~(1 << irqno);
  92
  93                 fpgadesc = irq_desc + FPGA_IRQ(irqno);
  94
  95                 desc_handle_irq(FPGA_IRQ(irqno), fpgadesc);
  96         }
  97
  98         desc->chip->unmask(irq);
  99 }
 100
 101 void __init board_a9m9750dev_init_irq(void)
 102 {
 103         u32 eic;
 104         int i;
 105
 106         if (gpio_request(11, "board a9m9750dev extirq2") == 0)
 107                 ns9360_gpio_configure(11, 0, 1);
 108         else
 109                 printk(KERN_ERR "%s: cannot get gpio 11 for IRQ_NS9XXX_EXT2\n",
 110                                 __func__);
 111
 112         for (i = FPGA_IRQ(0); i <= FPGA_IRQ(7); ++i) {
 113                 set_irq_chip(i, &a9m9750dev_fpga_chip);
 114                 set_irq_handler(i, handle_level_irq);
 115                 set_irq_flags(i, IRQF_VALID);
 116         }
 117
 118         /* IRQ_NS9XXX_EXT2: level sensitive + active low */
 119         eic = __raw_readl(SYS_EIC(2));
 120         REGSET(eic, SYS_EIC, PLTY, AL);
 121         REGSET(eic, SYS_EIC, LVEDG, LEVEL);
 122         __raw_writel(eic, SYS_EIC(2));
 123
 124         set_irq_chained_handler(IRQ_NS9XXX_EXT2,
 125                         a9m9750dev_fpga_demux_handler);
 126 }
 127
 128 void __init board_a9m9750dev_init_machine(void)
 129 {
 130         u32 reg;
 131
 132         /* setup static CS0: memory base ... */
 133         reg = __raw_readl(SYS_SMCSSMB(0));
 134         REGSETIM(reg, SYS_SMCSSMB, CSxB, NS9XXX_CSxSTAT_PHYS(0) >> 12);
 135         __raw_writel(reg, SYS_SMCSSMB(0));
 136
 137         /* ... and mask */
 138         reg = __raw_readl(SYS_SMCSSMM(0));
 139         REGSETIM(reg, SYS_SMCSSMM, CSxM, 0xfffff);
 140         REGSET(reg, SYS_SMCSSMM, CSEx, EN);
 141         __raw_writel(reg, SYS_SMCSSMM(0));
 142
 143         /* setup static CS0: memory configuration */
 144         reg = __raw_readl(MEM_SMC(0));
 145         REGSET(reg, MEM_SMC, PSMC, OFF);
 146         REGSET(reg, MEM_SMC, BSMC, OFF);
 147         REGSET(reg, MEM_SMC, EW, OFF);
 148         REGSET(reg, MEM_SMC, PB, 1);
 149         REGSET(reg, MEM_SMC, PC, AL);
 150         REGSET(reg, MEM_SMC, PM, DIS);
 151         REGSET(reg, MEM_SMC, MW, 8);
 152         __raw_writel(reg, MEM_SMC(0));
 153
 154         /* setup static CS0: timing */
 155         __raw_writel(0x2, MEM_SMWED(0));
 156         __raw_writel(0x2, MEM_SMOED(0));
 157         __raw_writel(0x6, MEM_SMRD(0));
 158         __raw_writel(0x6, MEM_SMWD(0));
 159 }