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 <mach/hardware.h>
  28 #include <asm/mach/map.h>
  29 #include <mach/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         while (stat) {
  81                 if (stat & 1) {
  82                         DEBUG_IRQ("handling irq %d\n", irq);
  83                         generic_handle_irq(irq);
  84                 }
  85                 irq++;
  86                 stat >>= 1;
  87         }
  88 }
  89
  90 static int
  91 netx_hif_irq_type(struct irq_data *d, unsigned int type)
  92 {
  93         unsigned int val, irq;
  94
  95         val = readl(NETX_DPMAS_IF_CONF1);
  96
  97         irq = d->irq - NETX_IRQ_HIF_CHAINED(0);
  98
  99         if (type & IRQ_TYPE_EDGE_RISING) {
 100                 DEBUG_IRQ("rising edges\n");
 101                 val |= (1 << 26) << irq;
 102         }
 103         if (type & IRQ_TYPE_EDGE_FALLING) {
 104                 DEBUG_IRQ("falling edges\n");
 105                 val &= ~((1 << 26) << irq);
 106         }
 107         if (type & IRQ_TYPE_LEVEL_LOW) {
 108                 DEBUG_IRQ("low level\n");
 109                 val &= ~((1 << 26) << irq);
 110         }
 111         if (type & IRQ_TYPE_LEVEL_HIGH) {
 112                 DEBUG_IRQ("high level\n");
 113                 val |= (1 << 26) << irq;
 114         }
 115
 116         writel(val, NETX_DPMAS_IF_CONF1);
 117
 118         return 0;
 119 }
 120
 121 static void
 122 netx_hif_ack_irq(struct irq_data *d)
 123 {
 124         unsigned int val, irq;
 125
 126         irq = d->irq - NETX_IRQ_HIF_CHAINED(0);
 127         writel((1 << 24) << irq, NETX_DPMAS_INT_STAT);
 128
 129         val = readl(NETX_DPMAS_INT_EN);
 130         val &= ~((1 << 24) << irq);
 131         writel(val, NETX_DPMAS_INT_EN);
 132
 133         DEBUG_IRQ("%s: irq %d\n", __func__, d->irq);
 134 }
 135
 136 static void
 137 netx_hif_mask_irq(struct irq_data *d)
 138 {
 139         unsigned int val, irq;
 140
 141         irq = d->irq - NETX_IRQ_HIF_CHAINED(0);
 142         val = readl(NETX_DPMAS_INT_EN);
 143         val &= ~((1 << 24) << irq);
 144         writel(val, NETX_DPMAS_INT_EN);
 145         DEBUG_IRQ("%s: irq %d\n", __func__, d->irq);
 146 }
 147
 148 static void
 149 netx_hif_unmask_irq(struct irq_data *d)
 150 {
 151         unsigned int val, irq;
 152
 153         irq = d->irq - NETX_IRQ_HIF_CHAINED(0);
 154         val = readl(NETX_DPMAS_INT_EN);
 155         val |= (1 << 24) << irq;
 156         writel(val, NETX_DPMAS_INT_EN);
 157         DEBUG_IRQ("%s: irq %d\n", __func__, d->irq);
 158 }
 159
 160 static struct irq_chip netx_hif_chip = {
 161         .irq_ack = netx_hif_ack_irq,
 162         .irq_mask = netx_hif_mask_irq,
 163         .irq_unmask = netx_hif_unmask_irq,
 164         .irq_set_type = netx_hif_irq_type,
 165 };
 166
 167 void __init netx_init_irq(void)
 168 {
 169         int irq;
 170
 171         vic_init(io_p2v(NETX_PA_VIC), NETX_IRQ_VIC_START, ~0, 0);
 172
 173         for (irq = NETX_IRQ_HIF_CHAINED(0); irq <= NETX_IRQ_HIF_LAST; irq++) {
 174                 irq_set_chip_and_handler(irq, &netx_hif_chip,
 175                                          handle_level_irq);
 176                 set_irq_flags(irq, IRQF_VALID);
 177         }
 178
 179         writel(NETX_DPMAS_INT_EN_GLB_EN, NETX_DPMAS_INT_EN);
 180         irq_set_chained_handler(NETX_IRQ_HIF, netx_hif_demux_handler);
 181 }
 182
 183 static int __init netx_init(void)
 184 {
 185         return platform_add_devices(devices, ARRAY_SIZE(devices));
 186 }
 187
 188 subsys_initcall(netx_init);
 189
 190 void netx_restart(char mode, const char *cmd)
 191 {
 192         writel(NETX_SYSTEM_RES_CR_FIRMW_RES_EN | NETX_SYSTEM_RES_CR_FIRMW_RES,
 193                NETX_SYSTEM_RES_CR);
 194 }