eisa.c
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上传日期:2013-04-10
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文件大小:12k
- /*
- * eisa.c - provide support for EISA adapters in PA-RISC machines
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * Copyright (c) 2001 Matthew Wilcox for Hewlett Packard
- * Copyright (c) 2001 Daniel Engstrom <5116@telia.com>
- *
- * There are two distinct EISA adapters. Mongoose is found in machines
- * before the 712; then the Wax ASIC is used. To complicate matters, the
- * Wax ASIC also includes a PS/2 and RS-232 controller, but those are
- * dealt with elsewhere; this file is concerned only with the EISA portions
- * of Wax.
- *
- *
- * HINT:
- * -----
- * To allow an ISA card to work properly in the EISA slot you need to
- * set an edge trigger level. This may be done on the palo command line
- * by adding the kernel parameter "eisa_irq_edge=n,n2,[...]]", with
- * n and n2 as the irq levels you want to use.
- *
- * Example: "eisa_irq_edge=10,11" allows ISA cards to operate at
- * irq levels 10 and 11.
- */
- #include <linux/init.h>
- #include <linux/ioport.h>
- #include <linux/irq.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/pci.h>
- #include <linux/sched.h>
- #include <linux/spinlock.h>
- #include <asm/byteorder.h>
- #include <asm/gsc.h>
- #include <asm/hardware.h>
- #include <asm/processor.h>
- #include <asm/delay.h>
- #include <asm/eisa_bus.h>
- #if 0
- #define EISA_DBG(msg, arg... ) printk(KERN_DEBUG "eisa: " msg , ## arg )
- #else
- #define EISA_DBG(msg, arg... )
- #endif
- #define SNAKES_EEPROM_BASE_ADDR 0xF0810400
- #define MIRAGE_EEPROM_BASE_ADDR 0xF00C0400
- static spinlock_t eisa_irq_lock = SPIN_LOCK_UNLOCKED;
- /* We can only have one EISA adapter in the system because neither
- * implementation can be flexed.
- */
- static struct eisa_ba {
- struct pci_hba_data hba;
- unsigned long eeprom_addr;
- } eisa_dev;
- /* Port ops */
- static inline unsigned long eisa_permute(unsigned short port)
- {
- if (port & 0x300) {
- return 0xfc000000 | ((port & 0xfc00) >> 6)
- | ((port & 0x3f8) << 9) | (port & 7);
- } else {
- return 0xfc000000 | port;
- }
- }
- unsigned char eisa_in8(unsigned short port)
- {
- if (EISA_bus)
- return gsc_readb(eisa_permute(port));
- return 0xff;
- }
- unsigned short eisa_in16(unsigned short port)
- {
- if (EISA_bus)
- return le16_to_cpu(gsc_readw(eisa_permute(port)));
- return 0xffff;
- }
- unsigned int eisa_in32(unsigned short port)
- {
- if (EISA_bus)
- return le32_to_cpu(gsc_readl(eisa_permute(port)));
- return 0xffffffff;
- }
- void eisa_out8(unsigned char data, unsigned short port)
- {
- if (EISA_bus)
- gsc_writeb(data, eisa_permute(port));
- }
- void eisa_out16(unsigned short data, unsigned short port)
- {
- if (EISA_bus)
- gsc_writew(cpu_to_le16(data), eisa_permute(port));
- }
- void eisa_out32(unsigned int data, unsigned short port)
- {
- if (EISA_bus)
- gsc_writel(cpu_to_le32(data), eisa_permute(port));
- }
- /* Interrupt handling */
- /* cached interrupt mask registers */
- static int master_mask;
- static int slave_mask;
- /* the trig level can be set with the
- * eisa_irq_edge=n,n,n commandline parameter
- * We should really read this from the EEPROM
- * in the furure.
- */
- /* irq 13,8,2,1,0 must be edge */
- static unsigned int eisa_irq_level; /* default to edge triggered */
- /* called by free irq */
- static void eisa_disable_irq(void *irq_dev, int irq)
- {
- unsigned long flags;
- EISA_DBG("disable irq %dn", irq);
- /* just mask for now */
- spin_lock_irqsave(&eisa_irq_lock, flags);
- if (irq & 8) {
- slave_mask |= (1 << (irq&7));
- eisa_out8(slave_mask, 0xa1);
- } else {
- master_mask |= (1 << (irq&7));
- eisa_out8(master_mask, 0x21);
- }
- spin_unlock_irqrestore(&eisa_irq_lock, flags);
- EISA_DBG("pic0 mask %02xn", eisa_in8(0x21));
- EISA_DBG("pic1 mask %02xn", eisa_in8(0xa1));
- }
- /* called by request irq */
- static void eisa_enable_irq(void *irq_dev, int irq)
- {
- unsigned long flags;
- EISA_DBG("enable irq %dn", irq);
-
- spin_lock_irqsave(&eisa_irq_lock, flags);
- if (irq & 8) {
- slave_mask &= ~(1 << (irq&7));
- eisa_out8(slave_mask, 0xa1);
- } else {
- master_mask &= ~(1 << (irq&7));
- eisa_out8(master_mask, 0x21);
- }
- spin_unlock_irqrestore(&eisa_irq_lock, flags);
- EISA_DBG("pic0 mask %02xn", eisa_in8(0x21));
- EISA_DBG("pic1 mask %02xn", eisa_in8(0xa1));
- }
- static void eisa_mask_irq(void *irq_dev, int irq)
- {
- unsigned long flags;
- EISA_DBG("mask irq %dn", irq);
-
- /* mask irq */
- spin_lock_irqsave(&eisa_irq_lock, flags);
- if (irq & 8) {
- slave_mask |= (1 << (irq&7));
- eisa_out8(slave_mask, 0xa1);
- } else {
- master_mask |= (1 << (irq&7));
- eisa_out8(master_mask, 0x21);
- }
- spin_unlock_irqrestore(&eisa_irq_lock, flags);
- }
- static void eisa_unmask_irq(void *irq_dev, int irq)
- {
- unsigned long flags;
- EISA_DBG("unmask irq %dn", irq);
-
- /* unmask */
- spin_lock_irqsave(&eisa_irq_lock, flags);
- if (irq & 8) {
- slave_mask &= ~(1 << (irq&7));
- eisa_out8(slave_mask, 0xa1);
- } else {
- master_mask &= ~(1 << (irq&7));
- eisa_out8(master_mask, 0x21);
- }
- spin_unlock_irqrestore(&eisa_irq_lock, flags);
- }
- static struct irqaction action[IRQ_PER_REGION];
- /* EISA needs to be fixed at IRQ region #0 (EISA_IRQ_REGION) */
- static struct irq_region eisa_irq_region = {
- ops: { eisa_disable_irq, eisa_enable_irq, eisa_mask_irq, eisa_unmask_irq },
- data: { name: "EISA", irqbase: 0 },
- action: action,
- };
- static void eisa_irq(int _, void *intr_dev, struct pt_regs *regs)
- {
- extern void do_irq(struct irqaction *a, int i, struct pt_regs *p);
- int irq = gsc_readb(0xfc01f000); /* EISA supports 16 irqs */
- unsigned long flags;
-
- spin_lock_irqsave(&eisa_irq_lock, flags);
- /* read IRR command */
- eisa_out8(0x0a, 0x20);
- eisa_out8(0x0a, 0xa0);
- EISA_DBG("irq IAR %02x 8259-1 irr %02x 8259-2 irr %02xn",
- irq, eisa_in8(0x20), eisa_in8(0xa0));
-
- /* read ISR command */
- eisa_out8(0x0a, 0x20);
- eisa_out8(0x0a, 0xa0);
- EISA_DBG("irq 8259-1 isr %02x imr %02x 8259-2 isr %02x imr %02xn",
- eisa_in8(0x20), eisa_in8(0x21), eisa_in8(0xa0), eisa_in8(0xa1));
-
- irq &= 0xf;
-
- /* mask irq and write eoi */
- if (irq & 8) {
- slave_mask |= (1 << (irq&7));
- eisa_out8(slave_mask, 0xa1);
- eisa_out8(0x60 | (irq&7),0xa0);/* 'Specific EOI' to slave */
- eisa_out8(0x62,0x20); /* 'Specific EOI' to master-IRQ2 */
-
- } else {
- master_mask |= (1 << (irq&7));
- eisa_out8(master_mask, 0x21);
- eisa_out8(0x60|irq,0x20); /* 'Specific EOI' to master */
- }
- spin_unlock_irqrestore(&eisa_irq_lock, flags);
-
- do_irq(&eisa_irq_region.action[irq], EISA_IRQ_REGION + irq, regs);
-
- spin_lock_irqsave(&eisa_irq_lock, flags);
- /* unmask */
- if (irq & 8) {
- slave_mask &= ~(1 << (irq&7));
- eisa_out8(slave_mask, 0xa1);
- } else {
- master_mask &= ~(1 << (irq&7));
- eisa_out8(master_mask, 0x21);
- }
- spin_unlock_irqrestore(&eisa_irq_lock, flags);
- }
- static void dummy_irq2_handler(int _, void *dev, struct pt_regs *regs)
- {
- printk(KERN_ALERT "eisa: uhh, irq2?n");
- }
- static void init_eisa_pic(void)
- {
- unsigned long flags;
-
- spin_lock_irqsave(&eisa_irq_lock, flags);
- eisa_out8(0xff, 0x21); /* mask during init */
- eisa_out8(0xff, 0xa1); /* mask during init */
-
- /* master pic */
- eisa_out8(0x11,0x20); /* ICW1 */
- eisa_out8(0x00,0x21); /* ICW2 */
- eisa_out8(0x04,0x21); /* ICW3 */
- eisa_out8(0x01,0x21); /* ICW4 */
- eisa_out8(0x40,0x20); /* OCW2 */
-
- /* slave pic */
- eisa_out8(0x11,0xa0); /* ICW1 */
- eisa_out8(0x08,0xa1); /* ICW2 */
- eisa_out8(0x02,0xa1); /* ICW3 */
- eisa_out8(0x01,0xa1); /* ICW4 */
- eisa_out8(0x40,0xa0); /* OCW2 */
-
- udelay(100);
-
- slave_mask = 0xff;
- master_mask = 0xfb;
- eisa_out8(slave_mask, 0xa1); /* OCW1 */
- eisa_out8(master_mask, 0x21); /* OCW1 */
-
- /* setup trig level */
- EISA_DBG("EISA edge/level %04xn", eisa_irq_level);
-
- eisa_out8(eisa_irq_level&0xff, 0x4d0); /* Set all irq's to edge */
- eisa_out8((eisa_irq_level >> 8) & 0xff, 0x4d1);
-
- EISA_DBG("pic0 mask %02xn", eisa_in8(0x21));
- EISA_DBG("pic1 mask %02xn", eisa_in8(0xa1));
- EISA_DBG("pic0 edge/level %02xn", eisa_in8(0x4d0));
- EISA_DBG("pic1 edge/level %02xn", eisa_in8(0x4d1));
-
- spin_unlock_irqrestore(&eisa_irq_lock, flags);
- }
- /* Device initialisation */
- #define is_mongoose(dev) (dev->id.sversion == 0x00076)
- static int __devinit eisa_probe(struct parisc_device *dev)
- {
- int result;
- char *name = is_mongoose(dev) ? "Mongoose" : "Wax";
- printk(KERN_INFO "%s EISA Adapter found at 0x%08lxn",
- name, dev->hpa);
- eisa_dev.hba.dev = dev;
- eisa_dev.hba.iommu = ccio_get_iommu(dev);
- eisa_dev.hba.lmmio_space.name = "EISA";
- eisa_dev.hba.lmmio_space.start = (unsigned long) 0xfffffffffc000000;
- eisa_dev.hba.lmmio_space.end = (unsigned long) 0xffffffffffbfffff;
- eisa_dev.hba.lmmio_space.flags = IORESOURCE_MEM;
- result = ccio_request_resource(dev, &eisa_dev.hba.lmmio_space);
- if (result < 0) {
- printk(KERN_ERR "EISA: failed to claim EISA Bus address space!n");
- return result;
- }
- eisa_dev.hba.io_space.name = "EISA";
- eisa_dev.hba.io_space.start = 0;
- eisa_dev.hba.io_space.end = 0xffff;
- eisa_dev.hba.lmmio_space.flags = IORESOURCE_IO;
- result = request_resource(&ioport_resource, &eisa_dev.hba.io_space);
- if (result < 0) {
- printk(KERN_ERR "EISA: failed to claim EISA Bus port space!n");
- return result;
- }
- pcibios_register_hba(&eisa_dev.hba);
- result = request_irq(dev->irq, eisa_irq, SA_SHIRQ, "EISA", NULL);
- if (result) {
- printk(KERN_ERR "EISA: request_irq failed!n");
- return result;
- }
-
- /* Reserve IRQ2 */
- action[2].handler = dummy_irq2_handler;
- action[2].name = "cascade";
-
- eisa_irq_region.data.dev = dev;
- irq_region[0] = &eisa_irq_region;
-
- EISA_bus = 1;
- if (dev->num_addrs) {
- /* newer firmware hand out the eeprom address */
- eisa_dev.eeprom_addr = dev->addr[0];
- } else {
- /* old firmware, need to figure out the box */
- if (is_mongoose(dev)) {
- eisa_dev.eeprom_addr = SNAKES_EEPROM_BASE_ADDR;
- } else {
- eisa_dev.eeprom_addr = MIRAGE_EEPROM_BASE_ADDR;
- }
- }
- eisa_eeprom_init(eisa_dev.eeprom_addr);
- eisa_enumerator(eisa_dev.eeprom_addr, &eisa_dev.hba.io_space, &eisa_dev.hba.lmmio_space);
- init_eisa_pic();
-
- return 0;
- }
- static struct parisc_device_id __devinitdata eisa_tbl[] = {
- { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00076 }, /* Mongoose */
- { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00090 }, /* Wax EISA */
- { 0, }
- };
- MODULE_DEVICE_TABLE(parisc, eisa_tbl);
- static struct parisc_driver eisa_driver = {
- name: "EISA Bus Adapter",
- id_table: eisa_tbl,
- probe: eisa_probe,
- };
- void __init eisa_init(void)
- {
- register_parisc_driver(&eisa_driver);
- }
- static unsigned int eisa_irq_configured;
- void eisa_make_irq_level(int num)
- {
- if (eisa_irq_configured& (1<<num)) {
- printk(KERN_WARNING
- "IRQ %d polarity configured twice (last to level)n",
- num);
- }
- eisa_irq_level |= (1<<num); /* set the corresponding bit */
- eisa_irq_configured |= (1<<num); /* set the corresponding bit */
- }
- void eisa_make_irq_edge(int num)
- {
- if (eisa_irq_configured& (1<<num)) {
- printk(KERN_WARNING
- "IRQ %d polarity configured twice (last to edge)n",
- num);
- }
- eisa_irq_level &= ~(1<<num); /* clear the corresponding bit */
- eisa_irq_configured |= (1<<num); /* set the corresponding bit */
- }
- static int __init eisa_irq_setup(char *str)
- {
- char *cur = str;
- int val;
- EISA_DBG("IRQ setupn");
- while (cur != NULL) {
- char *pe;
-
- val = (int) simple_strtoul(cur, &pe, 0);
- if (val > 15 || val < 0) {
- printk(KERN_ERR "eisa: EISA irq value are 0-15n");
- continue;
- }
- if (val == 2) {
- val = 9;
- }
- eisa_make_irq_edge(val); /* clear the corresponding bit */
- EISA_DBG("setting IRQ %d to edge-triggered moden", val);
-
- if ((cur = strchr(cur, ','))) {
- cur++;
- } else {
- break;
- }
- }
- return 1;
- }
- __setup("eisa_irq_edge=", eisa_irq_setup);