2 * linux/arch/arm/mach-h720x/common.c
4 * Copyright (C) 2003 Thomas Gleixner <tglx@linutronix.de>
5 * 2003 Robert Schwebel <r.schwebel@pengutronix.de>
6 * 2004 Sascha Hauer <s.hauer@pengutronix.de>
8 * common stuff for Hynix h720x processors
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
16 #include <linux/sched.h>
17 #include <linux/slab.h>
18 #include <linux/mman.h>
19 #include <linux/init.h>
20 #include <linux/interrupt.h>
24 #include <asm/pgtable.h>
26 #include <mach/hardware.h>
28 #include <asm/mach/irq.h>
29 #include <asm/mach/map.h>
30 #include <mach/irqs.h>
32 #include <asm/mach/dma.h>
35 #define IRQDBG(args...) printk(args)
37 #define IRQDBG(args...) do {} while(0)
40 void __init arch_dma_init(dma_t *dma)
45 * Return usecs since last timer reload
46 * (timercount * (usecs perjiffie)) / (ticks per jiffie)
48 unsigned long h720x_gettimeoffset(void)
50 return (CPU_REG (TIMER_VIRT, TM0_COUNT) * tick_usec) / LATCH;
56 static void mask_global_irq (unsigned int irq )
58 CPU_REG (IRQC_VIRT, IRQC_IER) &= ~(1 << irq);
64 static void unmask_global_irq (unsigned int irq )
66 CPU_REG (IRQC_VIRT, IRQC_IER) |= (1 << irq);
72 * Ack only for edge triggered int's valid
74 static void inline ack_gpio_irq(u32 irq)
76 u32 reg_base = GPIO_VIRT(IRQ_TO_REGNO(irq));
77 u32 bit = IRQ_TO_BIT(irq);
78 if ( (CPU_REG (reg_base, GPIO_EDGE) & bit))
79 CPU_REG (reg_base, GPIO_CLR) = bit;
85 static void inline mask_gpio_irq(u32 irq)
87 u32 reg_base = GPIO_VIRT(IRQ_TO_REGNO(irq));
88 u32 bit = IRQ_TO_BIT(irq);
89 CPU_REG (reg_base, GPIO_MASK) &= ~bit;
95 static void inline unmask_gpio_irq(u32 irq)
97 u32 reg_base = GPIO_VIRT(IRQ_TO_REGNO(irq));
98 u32 bit = IRQ_TO_BIT(irq);
99 CPU_REG (reg_base, GPIO_MASK) |= bit;
103 h720x_gpio_handler(unsigned int mask, unsigned int irq,
104 struct irq_desc *desc)
106 IRQDBG("%s irq: %d\n", __func__, irq);
109 IRQDBG("handling irq %d\n", irq);
110 generic_handle_irq(irq);
118 h720x_gpioa_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
120 unsigned int mask, irq;
122 mask = CPU_REG(GPIO_A_VIRT,GPIO_STAT);
123 irq = IRQ_CHAINED_GPIOA(0);
124 IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
125 h720x_gpio_handler(mask, irq, desc);
129 h720x_gpiob_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
131 unsigned int mask, irq;
132 mask = CPU_REG(GPIO_B_VIRT,GPIO_STAT);
133 irq = IRQ_CHAINED_GPIOB(0);
134 IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
135 h720x_gpio_handler(mask, irq, desc);
139 h720x_gpioc_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
141 unsigned int mask, irq;
143 mask = CPU_REG(GPIO_C_VIRT,GPIO_STAT);
144 irq = IRQ_CHAINED_GPIOC(0);
145 IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
146 h720x_gpio_handler(mask, irq, desc);
150 h720x_gpiod_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
152 unsigned int mask, irq;
154 mask = CPU_REG(GPIO_D_VIRT,GPIO_STAT);
155 irq = IRQ_CHAINED_GPIOD(0);
156 IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
157 h720x_gpio_handler(mask, irq, desc);
160 #ifdef CONFIG_CPU_H7202
162 h720x_gpioe_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
164 unsigned int mask, irq;
166 mask = CPU_REG(GPIO_E_VIRT,GPIO_STAT);
167 irq = IRQ_CHAINED_GPIOE(0);
168 IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
169 h720x_gpio_handler(mask, irq, desc);
173 static struct irq_chip h720x_global_chip = {
174 .ack = mask_global_irq,
175 .mask = mask_global_irq,
176 .unmask = unmask_global_irq,
179 static struct irq_chip h720x_gpio_chip = {
181 .mask = mask_gpio_irq,
182 .unmask = unmask_gpio_irq,
186 * Initialize IRQ's, mask all, enable multiplexed irq's
188 void __init h720x_init_irq (void)
192 /* Mask global irq's */
193 CPU_REG (IRQC_VIRT, IRQC_IER) = 0x0;
195 /* Mask all multiplexed irq's */
196 CPU_REG (GPIO_A_VIRT, GPIO_MASK) = 0x0;
197 CPU_REG (GPIO_B_VIRT, GPIO_MASK) = 0x0;
198 CPU_REG (GPIO_C_VIRT, GPIO_MASK) = 0x0;
199 CPU_REG (GPIO_D_VIRT, GPIO_MASK) = 0x0;
201 /* Initialize global IRQ's, fast path */
202 for (irq = 0; irq < NR_GLBL_IRQS; irq++) {
203 set_irq_chip(irq, &h720x_global_chip);
204 set_irq_handler(irq, handle_level_irq);
205 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
208 /* Initialize multiplexed IRQ's, slow path */
209 for (irq = IRQ_CHAINED_GPIOA(0) ; irq <= IRQ_CHAINED_GPIOD(31); irq++) {
210 set_irq_chip(irq, &h720x_gpio_chip);
211 set_irq_handler(irq, handle_edge_irq);
212 set_irq_flags(irq, IRQF_VALID );
214 set_irq_chained_handler(IRQ_GPIOA, h720x_gpioa_demux_handler);
215 set_irq_chained_handler(IRQ_GPIOB, h720x_gpiob_demux_handler);
216 set_irq_chained_handler(IRQ_GPIOC, h720x_gpioc_demux_handler);
217 set_irq_chained_handler(IRQ_GPIOD, h720x_gpiod_demux_handler);
219 #ifdef CONFIG_CPU_H7202
220 for (irq = IRQ_CHAINED_GPIOE(0) ; irq <= IRQ_CHAINED_GPIOE(31); irq++) {
221 set_irq_chip(irq, &h720x_gpio_chip);
222 set_irq_handler(irq, handle_edge_irq);
223 set_irq_flags(irq, IRQF_VALID );
225 set_irq_chained_handler(IRQ_GPIOE, h720x_gpioe_demux_handler);
228 /* Enable multiplexed irq's */
229 CPU_REG (IRQC_VIRT, IRQC_IER) = IRQ_ENA_MUX;
232 static struct map_desc h720x_io_desc[] __initdata = {
235 .pfn = __phys_to_pfn(IO_PHYS),
241 /* Initialize io tables */
242 void __init h720x_map_io(void)
244 iotable_init(h720x_io_desc,ARRAY_SIZE(h720x_io_desc));