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 <linux/io.h>
  26 #include <linux/irqchip/arm-vic.h>
  27 #include <linux/reboot.h>
  28 #include <mach/hardware.h>
  29 #include <asm/mach/map.h>
  30 #include <mach/netx-regs.h>
  31 #include <asm/mach/irq.h>
  32
  33 static struct map_desc netx_io_desc[] __initdata = {
  34         {
  35                 .virtual        = NETX_IO_VIRT,
  36                 .pfn            = __phys_to_pfn(NETX_IO_PHYS),
  37                 .length         = NETX_IO_SIZE,
  38                 .type           = MT_DEVICE
  39         }
  40 };
  41
  42 void __init netx_map_io(void)
  43 {
  44         iotable_init(netx_io_desc, ARRAY_SIZE(netx_io_desc));
  45 }
  46
  47 static struct resource netx_rtc_resources[] = {
  48         [0] = {
  49                 .start  = 0x00101200,
  50                 .end    = 0x00101220,
  51                 .flags  = IORESOURCE_MEM,
  52         },
  53 };
  54
  55 static struct platform_device netx_rtc_device = {
  56         .name           = "netx-rtc",
  57         .id             = 0,
  58         .num_resources  = ARRAY_SIZE(netx_rtc_resources),
  59         .resource       = netx_rtc_resources,
  60 };
  61
  62 static struct platform_device *devices[] __initdata = {
  63         &netx_rtc_device,
  64 };
  65
  66 #if 0
  67 #define DEBUG_IRQ(fmt...)       printk(fmt)
  68 #else
  69 #define DEBUG_IRQ(fmt...)       while (0) {}
  70 #endif
  71
  72 static void
  73 netx_hif_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
  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         while (stat) {
  82                 if (stat & 1) {
  83                         DEBUG_IRQ("handling irq %d\n", irq);
  84                         generic_handle_irq(irq);
  85                 }
  86                 irq++;
  87                 stat >>= 1;
  88         }
  89 }
  90
  91 static int
  92 netx_hif_irq_type(struct irq_data *d, unsigned int type)
  93 {
  94         unsigned int val, irq;
  95
  96         val = readl(NETX_DPMAS_IF_CONF1);
  97
  98         irq = d->irq - NETX_IRQ_HIF_CHAINED(0);
  99
 100         if (type & IRQ_TYPE_EDGE_RISING) {
 101                 DEBUG_IRQ("rising edges\n");
 102                 val |= (1 << 26) << irq;
 103         }
 104         if (type & IRQ_TYPE_EDGE_FALLING) {
 105                 DEBUG_IRQ("falling edges\n");
 106                 val &= ~((1 << 26) << irq);
 107         }
 108         if (type & IRQ_TYPE_LEVEL_LOW) {
 109                 DEBUG_IRQ("low level\n");
 110                 val &= ~((1 << 26) << irq);
 111         }
 112         if (type & IRQ_TYPE_LEVEL_HIGH) {
 113                 DEBUG_IRQ("high level\n");
 114                 val |= (1 << 26) << irq;
 115         }
 116
 117         writel(val, NETX_DPMAS_IF_CONF1);
 118
 119         return 0;
 120 }
 121
 122 static void
 123 netx_hif_ack_irq(struct irq_data *d)
 124 {
 125         unsigned int val, irq;
 126
 127         irq = d->irq - NETX_IRQ_HIF_CHAINED(0);
 128         writel((1 << 24) << irq, NETX_DPMAS_INT_STAT);
 129
 130         val = readl(NETX_DPMAS_INT_EN);
 131         val &= ~((1 << 24) << irq);
 132         writel(val, NETX_DPMAS_INT_EN);
 133
 134         DEBUG_IRQ("%s: irq %d\n", __func__, d->irq);
 135 }
 136
 137 static void
 138 netx_hif_mask_irq(struct irq_data *d)
 139 {
 140         unsigned int val, irq;
 141
 142         irq = d->irq - NETX_IRQ_HIF_CHAINED(0);
 143         val = readl(NETX_DPMAS_INT_EN);
 144         val &= ~((1 << 24) << irq);
 145         writel(val, NETX_DPMAS_INT_EN);
 146         DEBUG_IRQ("%s: irq %d\n", __func__, d->irq);
 147 }
 148
 149 static void
 150 netx_hif_unmask_irq(struct irq_data *d)
 151 {
 152         unsigned int val, irq;
 153
 154         irq = d->irq - NETX_IRQ_HIF_CHAINED(0);
 155         val = readl(NETX_DPMAS_INT_EN);
 156         val |= (1 << 24) << irq;
 157         writel(val, NETX_DPMAS_INT_EN);
 158         DEBUG_IRQ("%s: irq %d\n", __func__, d->irq);
 159 }
 160
 161 static struct irq_chip netx_hif_chip = {
 162         .irq_ack = netx_hif_ack_irq,
 163         .irq_mask = netx_hif_mask_irq,
 164         .irq_unmask = netx_hif_unmask_irq,
 165         .irq_set_type = netx_hif_irq_type,
 166 };
 167
 168 void __init netx_init_irq(void)
 169 {
 170         int irq;
 171
 172         vic_init(io_p2v(NETX_PA_VIC), NETX_IRQ_VIC_START, ~0, 0);
 173
 174         for (irq = NETX_IRQ_HIF_CHAINED(0); irq <= NETX_IRQ_HIF_LAST; irq++) {
 175                 irq_set_chip_and_handler(irq, &netx_hif_chip,
 176                                          handle_level_irq);
 177                 set_irq_flags(irq, IRQF_VALID);
 178         }
 179
 180         writel(NETX_DPMAS_INT_EN_GLB_EN, NETX_DPMAS_INT_EN);
 181         irq_set_chained_handler(NETX_IRQ_HIF, netx_hif_demux_handler);
 182 }
 183
 184 static int __init netx_init(void)
 185 {
 186         return platform_add_devices(devices, ARRAY_SIZE(devices));
 187 }
 188
 189 subsys_initcall(netx_init);
 190
 191 void netx_restart(enum reboot_mode mode, const char *cmd)
 192 {
 193         writel(NETX_SYSTEM_RES_CR_FIRMW_RES_EN | NETX_SYSTEM_RES_CR_FIRMW_RES,
 194                NETX_SYSTEM_RES_CR);
 195 }