arch/arm/mach-netx/generic.c

   1 /*
   2  * arch/arm/mach-netx/generic.c
   3  *
   4  * Copyright (C) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #include <linux/device.h>
  21 #include <linux/init.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <asm/hardware.h>
  26 #include <asm/mach/map.h>
  27 #include <asm/hardware/vic.h>
  28 #include <asm/io.h>
  29 #include <asm/arch/netx-regs.h>
  30 #include <asm/mach/irq.h>
  31
  32 static struct map_desc netx_io_desc[] __initdata = {
  33         {
  34                 .virtual        = NETX_IO_VIRT,
  35                 .pfn            = __phys_to_pfn(NETX_IO_PHYS),
  36                 .length         = NETX_IO_SIZE,
  37                 .type           = MT_DEVICE
  38         }
  39 };
  40
  41 void __init netx_map_io(void)
  42 {
  43         iotable_init(netx_io_desc, ARRAY_SIZE(netx_io_desc));
  44 }
  45
  46 static struct resource netx_rtc_resources[] = {
  47         [0] = {
  48                 .start  = 0x00101200,
  49                 .end    = 0x00101220,
  50                 .flags  = IORESOURCE_MEM,
  51         },
  52 };
  53
  54 static struct platform_device netx_rtc_device = {
  55         .name           = "netx-rtc",
  56         .id             = 0,
  57         .num_resources  = ARRAY_SIZE(netx_rtc_resources),
  58         .resource       = netx_rtc_resources,
  59 };
  60
  61 static struct platform_device *devices[] __initdata = {
  62         &netx_rtc_device,
  63 };
  64
  65 #if 0
  66 #define DEBUG_IRQ(fmt...)       printk(fmt)
  67 #else
  68 #define DEBUG_IRQ(fmt...)       while (0) {}
  69 #endif
  70
  71 static void
  72 netx_hif_demux_handler(unsigned int irq_unused, struct irqdesc *desc,
  73                         struct pt_regs *regs)
  74 {
  75         unsigned int irq = NETX_IRQ_HIF_CHAINED(0);
  76         unsigned int stat;
  77
  78         stat = ((readl(NETX_DPMAS_INT_EN) &
  79                 readl(NETX_DPMAS_INT_STAT)) >> 24) & 0x1f;
  80
  81         desc = irq_desc + NETX_IRQ_HIF_CHAINED(0);
  82
  83         while (stat) {
  84                 if (stat & 1) {
  85                         DEBUG_IRQ("handling irq %d\n", irq);
  86                         desc_handle_irq(irq, desc, regs);
  87                 }
  88                 irq++;
  89                 desc++;
  90                 stat >>= 1;
  91         }
  92 }
  93
  94 static int
  95 netx_hif_irq_type(unsigned int _irq, unsigned int type)
  96 {
  97         unsigned int val, irq;
  98
  99         val = readl(NETX_DPMAS_IF_CONF1);
 100
 101         irq = _irq - NETX_IRQ_HIF_CHAINED(0);
 102
 103         if (type & __IRQT_RISEDGE) {
 104                 DEBUG_IRQ("rising edges\n");
 105                 val |= (1 << 26) << irq;
 106         }
 107         if (type & __IRQT_FALEDGE) {
 108                 DEBUG_IRQ("falling edges\n");
 109                 val &= ~((1 << 26) << irq);
 110         }
 111         if (type & __IRQT_LOWLVL) {
 112                 DEBUG_IRQ("low level\n");
 113                 val &= ~((1 << 26) << irq);
 114         }
 115         if (type & __IRQT_HIGHLVL) {
 116                 DEBUG_IRQ("high level\n");
 117                 val |= (1 << 26) << irq;
 118         }
 119
 120         writel(val, NETX_DPMAS_IF_CONF1);
 121
 122         return 0;
 123 }
 124
 125 static void
 126 netx_hif_ack_irq(unsigned int _irq)
 127 {
 128         unsigned int val, irq;
 129
 130         irq = _irq - NETX_IRQ_HIF_CHAINED(0);
 131         writel((1 << 24) << irq, NETX_DPMAS_INT_STAT);
 132
 133         val = readl(NETX_DPMAS_INT_EN);
 134         val &= ~((1 << 24) << irq);
 135         writel(val, NETX_DPMAS_INT_EN);
 136
 137         DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, _irq);
 138 }
 139
 140 static void
 141 netx_hif_mask_irq(unsigned int _irq)
 142 {
 143         unsigned int val, irq;
 144
 145         irq = _irq - NETX_IRQ_HIF_CHAINED(0);
 146         val = readl(NETX_DPMAS_INT_EN);
 147         val &= ~((1 << 24) << irq);
 148         writel(val, NETX_DPMAS_INT_EN);
 149         DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, _irq);
 150 }
 151
 152 static void
 153 netx_hif_unmask_irq(unsigned int _irq)
 154 {
 155         unsigned int val, irq;
 156
 157         irq = _irq - NETX_IRQ_HIF_CHAINED(0);
 158         val = readl(NETX_DPMAS_INT_EN);
 159         val |= (1 << 24) << irq;
 160         writel(val, NETX_DPMAS_INT_EN);
 161         DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, _irq);
 162 }
 163
 164 static struct irqchip netx_hif_chip = {
 165         .ack = netx_hif_ack_irq,
 166         .mask = netx_hif_mask_irq,
 167         .unmask = netx_hif_unmask_irq,
 168         .set_type = netx_hif_irq_type,
 169 };
 170
 171 void __init netx_init_irq(void)
 172 {
 173         int irq;
 174
 175         vic_init(__io(io_p2v(NETX_PA_VIC)), 0, ~0);
 176
 177         for (irq = NETX_IRQ_HIF_CHAINED(0); irq <= NETX_IRQ_HIF_LAST; irq++) {
 178                 set_irq_chip(irq, &netx_hif_chip);
 179                 set_irq_handler(irq, do_level_IRQ);
 180                 set_irq_flags(irq, IRQF_VALID);
 181         }
 182
 183         writel(NETX_DPMAS_INT_EN_GLB_EN, NETX_DPMAS_INT_EN);
 184         set_irq_chained_handler(NETX_IRQ_HIF, netx_hif_demux_handler);
 185 }
 186
 187 static int __init netx_init(void)
 188 {
 189         return platform_add_devices(devices, ARRAY_SIZE(devices));
 190 }
 191
 192 subsys_initcall(netx_init);
 193