/arch/sh/cchips/hd6446x/hd64465/setup.c

  1/*
  2 * $Id: setup.c,v 1.4 2003/08/03 03:05:10 lethal Exp $
  3 *
  4 * Setup and IRQ handling code for the HD64465 companion chip.
  5 * by Greg Banks <gbanks@pocketpenguins.com>
  6 * Copyright (c) 2000 PocketPenguins Inc
  7 *
  8 * Derived from setup_hd64461.c which bore the message:
  9 * Copyright (C) 2000 YAEGASHI Takeshi
 10 */
 11
 12#include <linux/config.h>
 13#include <linux/sched.h>
 14#include <linux/module.h>
 15#include <linux/kernel.h>
 16#include <linux/param.h>
 17#include <linux/ioport.h>
 18#include <linux/interrupt.h>
 19#include <linux/init.h>
 20#include <linux/irq.h>
 21
 22#include <asm/io.h>
 23#include <asm/irq.h>
 24
 25#include <asm/hd64465/hd64465.h>
 26
 27static void disable_hd64465_irq(unsigned int irq)
 28{
 29	unsigned long flags;
 30	unsigned short nimr;
 31	unsigned short mask = 1 << (irq - HD64465_IRQ_BASE);
 32
 33    	pr_debug("disable_hd64465_irq(%d): mask=%x\n", irq, mask);
 34	local_irq_save(flags);
 35	nimr = inw(HD64465_REG_NIMR);
 36	nimr |= mask;
 37	outw(nimr, HD64465_REG_NIMR);
 38	local_irq_restore(flags);
 39}
 40
 41
 42static void enable_hd64465_irq(unsigned int irq)
 43{
 44	unsigned long flags;
 45	unsigned short nimr;
 46	unsigned short mask = 1 << (irq - HD64465_IRQ_BASE);
 47
 48    	pr_debug("enable_hd64465_irq(%d): mask=%x\n", irq, mask);
 49	local_irq_save(flags);
 50	nimr = inw(HD64465_REG_NIMR);
 51	nimr &= ~mask;
 52	outw(nimr, HD64465_REG_NIMR);
 53	local_irq_restore(flags);
 54}
 55
 56
 57static void mask_and_ack_hd64465(unsigned int irq)
 58{
 59	disable_hd64465_irq(irq);
 60}
 61
 62
 63static void end_hd64465_irq(unsigned int irq)
 64{
 65	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 66		enable_hd64465_irq(irq);
 67}
 68
 69
 70static unsigned int startup_hd64465_irq(unsigned int irq)
 71{ 
 72	enable_hd64465_irq(irq);
 73	return 0;
 74}
 75
 76
 77static void shutdown_hd64465_irq(unsigned int irq)
 78{
 79	disable_hd64465_irq(irq);
 80}
 81
 82
 83static struct hw_interrupt_type hd64465_irq_type = {
 84	.typename	= "HD64465-IRQ",
 85	.startup	= startup_hd64465_irq,
 86	.shutdown	= shutdown_hd64465_irq,
 87	.enable		= enable_hd64465_irq,
 88	.disable	= disable_hd64465_irq,
 89	.ack		= mask_and_ack_hd64465,
 90	.end		= end_hd64465_irq,
 91};
 92
 93
 94static irqreturn_t hd64465_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 95{
 96	printk(KERN_INFO
 97	       "HD64465: spurious interrupt, nirr: 0x%x nimr: 0x%x\n",
 98	       inw(HD64465_REG_NIRR), inw(HD64465_REG_NIMR));
 99
100	return IRQ_NONE;
101}
102
103
104/*====================================================*/
105
106/*
107 * Support for a secondary IRQ demux step.  This is necessary
108 * because the HD64465 presents a very thin interface to the
109 * PCMCIA bus; a lot of features (such as remapping interrupts)
110 * normally done in hardware by other PCMCIA host bridges is
111 * instead done in software.
112 */
113static struct
114{
115    int (*func)(int, void *);
116    void *dev;
117} hd64465_demux[HD64465_IRQ_NUM];
118
119void hd64465_register_irq_demux(int irq,
120		int (*demux)(int irq, void *dev), void *dev)
121{
122    	hd64465_demux[irq - HD64465_IRQ_BASE].func = demux;
123    	hd64465_demux[irq - HD64465_IRQ_BASE].dev = dev;
124}
125EXPORT_SYMBOL(hd64465_register_irq_demux);
126
127void hd64465_unregister_irq_demux(int irq)
128{
129    	hd64465_demux[irq - HD64465_IRQ_BASE].func = 0;
130}
131EXPORT_SYMBOL(hd64465_unregister_irq_demux);
132
133
134
135int hd64465_irq_demux(int irq)
136{
137	if (irq == CONFIG_HD64465_IRQ) {
138		unsigned short i, bit;
139		unsigned short nirr = inw(HD64465_REG_NIRR);
140		unsigned short nimr = inw(HD64465_REG_NIMR);
141
142    	    	pr_debug("hd64465_irq_demux, nirr=%04x, nimr=%04x\n", nirr, nimr);
143		nirr &= ~nimr;
144		for (bit = 1, i = 0 ; i < HD64465_IRQ_NUM ; bit <<= 1, i++)
145		    if (nirr & bit)
146		    	break;
147
148    	    	if (i < HD64465_IRQ_NUM) {
149		    irq = HD64465_IRQ_BASE + i;
150    	    	    if (hd64465_demux[i].func != 0)
151		    	irq = hd64465_demux[i].func(irq, hd64465_demux[i].dev);
152		}
153	}
154	return irq;
155}
156
157static struct irqaction irq0  = { hd64465_interrupt, SA_INTERRUPT, CPU_MASK_NONE, "HD64465", NULL, NULL};
158
159
160static int __init setup_hd64465(void)
161{
162	int i;
163	unsigned short rev;
164	unsigned short smscr;
165
166	if (!MACH_HD64465)
167		return 0;
168
169	printk(KERN_INFO "HD64465 configured at 0x%x on irq %d(mapped into %d to %d)\n",
170	       CONFIG_HD64465_IOBASE,
171	       CONFIG_HD64465_IRQ,
172	       HD64465_IRQ_BASE,
173	       HD64465_IRQ_BASE+HD64465_IRQ_NUM-1);
174
175	if (inw(HD64465_REG_SDID) != HD64465_SDID) {
176		printk(KERN_ERR "HD64465 device ID not found, check base address\n");
177	}
178
179	rev = inw(HD64465_REG_SRR);
180	printk(KERN_INFO "HD64465 hardware revision %d.%d\n", (rev >> 8) & 0xff, rev & 0xff);
181	       
182	outw(0xffff, HD64465_REG_NIMR); 	/* mask all interrupts */
183
184	for (i = 0; i < HD64465_IRQ_NUM ; i++) {
185		irq_desc[HD64465_IRQ_BASE + i].handler = &hd64465_irq_type;
186	}
187
188	setup_irq(CONFIG_HD64465_IRQ, &irq0);
189
190#ifdef CONFIG_SERIAL
191	/* wake up the UART from STANDBY at this point */
192	smscr = inw(HD64465_REG_SMSCR);
193	outw(smscr & (~HD64465_SMSCR_UARTST), HD64465_REG_SMSCR);
194
195	/* remap IO ports for first ISA serial port to HD64465 UART */
196	hd64465_port_map(0x3f8, 8, CONFIG_HD64465_IOBASE + 0x8000, 1);
197#endif
198
199	return 0;
200}
201
202module_init(setup_hd64465);