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 irq_desc *desc)
  73 {
  74         unsigned int irq = NETX_IRQ_HIF_CHAINED(0);
  75         unsigned int stat;
  76
  77         stat = ((readl(NETX_DPMAS_INT_EN) &
  78                 readl(NETX_DPMAS_INT_STAT)) >> 24) & 0x1f;
  79
  80         desc = irq_desc + NETX_IRQ_HIF_CHAINED(0);
  81
  82         while (stat) {
  83                 if (stat & 1) {
  84                         DEBUG_IRQ("handling irq %d\n", irq);
  85                         desc_handle_irq(irq, desc);
  86                 }
  87                 irq++;
  88                 desc++;
  89                 stat >>= 1;
  90         }
  91 }
  92
  93 static int
  94 netx_hif_irq_type(unsigned int _irq, unsigned int type)
  95 {
  96         unsigned int val, irq;
  97
  98         val = readl(NETX_DPMAS_IF_CONF1);
  99
 100         irq = _irq - NETX_IRQ_HIF_CHAINED(0);
 101
 102         if (type & __IRQT_RISEDGE) {
 103                 DEBUG_IRQ("rising edges\n");
 104                 val |= (1 << 26) << irq;
 105         }
 106         if (type & __IRQT_FALEDGE) {
 107                 DEBUG_IRQ("falling edges\n");
 108                 val &= ~((1 << 26) << irq);
 109         }
 110         if (type & __IRQT_LOWLVL) {
 111                 DEBUG_IRQ("low level\n");
 112                 val &= ~((1 << 26) << irq);
 113         }
 114         if (type & __IRQT_HIGHLVL) {
 115                 DEBUG_IRQ("high level\n");
 116                 val |= (1 << 26) << irq;
 117         }
 118
 119         writel(val, NETX_DPMAS_IF_CONF1);
 120
 121         return 0;
 122 }
 123
 124 static void
 125 netx_hif_ack_irq(unsigned int _irq)
 126 {
 127         unsigned int val, irq;
 128
 129         irq = _irq - NETX_IRQ_HIF_CHAINED(0);
 130         writel((1 << 24) << irq, NETX_DPMAS_INT_STAT);
 131
 132         val = readl(NETX_DPMAS_INT_EN);
 133         val &= ~((1 << 24) << irq);
 134         writel(val, NETX_DPMAS_INT_EN);
 135
 136         DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, _irq);
 137 }
 138
 139 static void
 140 netx_hif_mask_irq(unsigned int _irq)
 141 {
 142         unsigned int val, irq;
 143
 144         irq = _irq - NETX_IRQ_HIF_CHAINED(0);
 145         val = readl(NETX_DPMAS_INT_EN);
 146         val &= ~((1 << 24) << irq);
 147         writel(val, NETX_DPMAS_INT_EN);
 148         DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, _irq);
 149 }
 150
 151 static void
 152 netx_hif_unmask_irq(unsigned int _irq)
 153 {
 154         unsigned int val, irq;
 155
 156         irq = _irq - NETX_IRQ_HIF_CHAINED(0);
 157         val = readl(NETX_DPMAS_INT_EN);
 158         val |= (1 << 24) << irq;
 159         writel(val, NETX_DPMAS_INT_EN);
 160         DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, _irq);
 161 }
 162
 163 static struct irq_chip netx_hif_chip = {
 164         .ack = netx_hif_ack_irq,
 165         .mask = netx_hif_mask_irq,
 166         .unmask = netx_hif_unmask_irq,
 167         .set_type = netx_hif_irq_type,
 168 };
 169
 170 void __init netx_init_irq(void)
 171 {
 172         int irq;
 173
 174         vic_init(__io(io_p2v(NETX_PA_VIC)), 0, ~0);
 175
 176         for (irq = NETX_IRQ_HIF_CHAINED(0); irq <= NETX_IRQ_HIF_LAST; irq++) {
 177                 set_irq_chip(irq, &netx_hif_chip);
 178                 set_irq_handler(irq, handle_level_irq);
 179                 set_irq_flags(irq, IRQF_VALID);
 180         }
 181
 182         writel(NETX_DPMAS_INT_EN_GLB_EN, NETX_DPMAS_INT_EN);
 183         set_irq_chained_handler(NETX_IRQ_HIF, netx_hif_demux_handler);
 184 }
 185
 186 static int __init netx_init(void)
 187 {
 188         return platform_add_devices(devices, ARRAY_SIZE(devices));
 189 }
 190
 191 subsys_initcall(netx_init);
 192