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
 33static 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
 42void __init netx_map_io(void)
 43{
 44	iotable_init(netx_io_desc, ARRAY_SIZE(netx_io_desc));
 45}
 46
 47static struct resource netx_rtc_resources[] = {
 48	[0] = {
 49		.start	= 0x00101200,
 50		.end	= 0x00101220,
 51		.flags	= IORESOURCE_MEM,
 52	},
 53};
 54
 55static 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
 62static 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
 72static void netx_hif_demux_handler(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
 90static int
 91netx_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
121static void
122netx_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
136static void
137netx_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
148static void
149netx_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
160static 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
167void __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		irq_clear_status_flags(irq, IRQ_NOREQUEST);
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
183static int __init netx_init(void)
184{
185	return platform_add_devices(devices, ARRAY_SIZE(devices));
186}
187
188subsys_initcall(netx_init);
189
190void netx_restart(enum reboot_mode 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}