2 * eisa.c - provide support for EISA adapters in PA-RISC machines
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Copyright (c) 2001 Matthew Wilcox for Hewlett Packard
10 * Copyright (c) 2001 Daniel Engstrom <5116@telia.com>
12 * There are two distinct EISA adapters. Mongoose is found in machines
13 * before the 712; then the Wax ASIC is used. To complicate matters, the
14 * Wax ASIC also includes a PS/2 and RS-232 controller, but those are
15 * dealt with elsewhere; this file is concerned only with the EISA portions
21 * To allow an ISA card to work properly in the EISA slot you need to
22 * set an edge trigger level. This may be done on the palo command line
23 * by adding the kernel parameter "eisa_irq_edge=n,n2,[...]]", with
24 * n and n2 as the irq levels you want to use.
26 * Example: "eisa_irq_edge=10,11" allows ISA cards to operate at
27 * irq levels 10 and 11.
30 #include <linux/init.h>
31 #include <linux/ioport.h>
32 #include <linux/interrupt.h>
33 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/pci.h>
36 #include <linux/sched.h>
37 #include <linux/spinlock.h>
38 #include <linux/eisa.h>
40 #include <asm/byteorder.h>
42 #include <asm/hardware.h>
43 #include <asm/processor.h>
44 #include <asm/parisc-device.h>
45 #include <asm/delay.h>
46 #include <asm/eisa_bus.h>
47 #include <asm/eisa_eeprom.h>
50 #define EISA_DBG(msg, arg... ) printk(KERN_DEBUG "eisa: " msg , ## arg )
52 #define EISA_DBG(msg, arg... )
55 #define SNAKES_EEPROM_BASE_ADDR 0xF0810400
56 #define MIRAGE_EEPROM_BASE_ADDR 0xF00C0400
58 static DEFINE_SPINLOCK(eisa_irq_lock);
60 void __iomem *eisa_eeprom_addr;
62 /* We can only have one EISA adapter in the system because neither
63 * implementation can be flexed.
65 static struct eisa_ba {
66 struct pci_hba_data hba;
67 unsigned long eeprom_addr;
68 struct eisa_root_device root;
73 static inline unsigned long eisa_permute(unsigned short port)
76 return 0xfc000000 | ((port & 0xfc00) >> 6)
77 | ((port & 0x3f8) << 9) | (port & 7);
79 return 0xfc000000 | port;
83 unsigned char eisa_in8(unsigned short port)
86 return gsc_readb(eisa_permute(port));
90 unsigned short eisa_in16(unsigned short port)
93 return le16_to_cpu(gsc_readw(eisa_permute(port)));
97 unsigned int eisa_in32(unsigned short port)
100 return le32_to_cpu(gsc_readl(eisa_permute(port)));
104 void eisa_out8(unsigned char data, unsigned short port)
107 gsc_writeb(data, eisa_permute(port));
110 void eisa_out16(unsigned short data, unsigned short port)
113 gsc_writew(cpu_to_le16(data), eisa_permute(port));
116 void eisa_out32(unsigned int data, unsigned short port)
119 gsc_writel(cpu_to_le32(data), eisa_permute(port));
123 /* We call these directly without PCI. See asm/io.h. */
124 EXPORT_SYMBOL(eisa_in8);
125 EXPORT_SYMBOL(eisa_in16);
126 EXPORT_SYMBOL(eisa_in32);
127 EXPORT_SYMBOL(eisa_out8);
128 EXPORT_SYMBOL(eisa_out16);
129 EXPORT_SYMBOL(eisa_out32);
132 /* Interrupt handling */
134 /* cached interrupt mask registers */
135 static int master_mask;
136 static int slave_mask;
138 /* the trig level can be set with the
139 * eisa_irq_edge=n,n,n commandline parameter
140 * We should really read this from the EEPROM
143 /* irq 13,8,2,1,0 must be edge */
144 static unsigned int eisa_irq_level; /* default to edge triggered */
147 /* called by free irq */
148 static void eisa_disable_irq(unsigned int irq)
152 EISA_DBG("disable irq %d\n", irq);
153 /* just mask for now */
154 spin_lock_irqsave(&eisa_irq_lock, flags);
156 slave_mask |= (1 << (irq&7));
157 eisa_out8(slave_mask, 0xa1);
159 master_mask |= (1 << (irq&7));
160 eisa_out8(master_mask, 0x21);
162 spin_unlock_irqrestore(&eisa_irq_lock, flags);
163 EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
164 EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
167 /* called by request irq */
168 static void eisa_enable_irq(unsigned int irq)
171 EISA_DBG("enable irq %d\n", irq);
173 spin_lock_irqsave(&eisa_irq_lock, flags);
175 slave_mask &= ~(1 << (irq&7));
176 eisa_out8(slave_mask, 0xa1);
178 master_mask &= ~(1 << (irq&7));
179 eisa_out8(master_mask, 0x21);
181 spin_unlock_irqrestore(&eisa_irq_lock, flags);
182 EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
183 EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
186 static unsigned int eisa_startup_irq(unsigned int irq)
188 eisa_enable_irq(irq);
192 static struct hw_interrupt_type eisa_interrupt_type = {
194 .startup = eisa_startup_irq,
195 .shutdown = eisa_disable_irq,
196 .enable = eisa_enable_irq,
197 .disable = eisa_disable_irq,
202 static irqreturn_t eisa_irq(int wax_irq, void *intr_dev, struct pt_regs *regs)
204 int irq = gsc_readb(0xfc01f000); /* EISA supports 16 irqs */
207 spin_lock_irqsave(&eisa_irq_lock, flags);
208 /* read IRR command */
209 eisa_out8(0x0a, 0x20);
210 eisa_out8(0x0a, 0xa0);
212 EISA_DBG("irq IAR %02x 8259-1 irr %02x 8259-2 irr %02x\n",
213 irq, eisa_in8(0x20), eisa_in8(0xa0));
215 /* read ISR command */
216 eisa_out8(0x0a, 0x20);
217 eisa_out8(0x0a, 0xa0);
218 EISA_DBG("irq 8259-1 isr %02x imr %02x 8259-2 isr %02x imr %02x\n",
219 eisa_in8(0x20), eisa_in8(0x21), eisa_in8(0xa0), eisa_in8(0xa1));
223 /* mask irq and write eoi */
225 slave_mask |= (1 << (irq&7));
226 eisa_out8(slave_mask, 0xa1);
227 eisa_out8(0x60 | (irq&7),0xa0);/* 'Specific EOI' to slave */
228 eisa_out8(0x62,0x20); /* 'Specific EOI' to master-IRQ2 */
231 master_mask |= (1 << (irq&7));
232 eisa_out8(master_mask, 0x21);
233 eisa_out8(0x60|irq,0x20); /* 'Specific EOI' to master */
235 spin_unlock_irqrestore(&eisa_irq_lock, flags);
239 spin_lock_irqsave(&eisa_irq_lock, flags);
242 slave_mask &= ~(1 << (irq&7));
243 eisa_out8(slave_mask, 0xa1);
245 master_mask &= ~(1 << (irq&7));
246 eisa_out8(master_mask, 0x21);
248 spin_unlock_irqrestore(&eisa_irq_lock, flags);
252 static irqreturn_t dummy_irq2_handler(int _, void *dev, struct pt_regs *regs)
254 printk(KERN_ALERT "eisa: uhh, irq2?\n");
258 static struct irqaction irq2_action = {
259 .handler = dummy_irq2_handler,
263 static void init_eisa_pic(void)
267 spin_lock_irqsave(&eisa_irq_lock, flags);
269 eisa_out8(0xff, 0x21); /* mask during init */
270 eisa_out8(0xff, 0xa1); /* mask during init */
273 eisa_out8(0x11,0x20); /* ICW1 */
274 eisa_out8(0x00,0x21); /* ICW2 */
275 eisa_out8(0x04,0x21); /* ICW3 */
276 eisa_out8(0x01,0x21); /* ICW4 */
277 eisa_out8(0x40,0x20); /* OCW2 */
280 eisa_out8(0x11,0xa0); /* ICW1 */
281 eisa_out8(0x08,0xa1); /* ICW2 */
282 eisa_out8(0x02,0xa1); /* ICW3 */
283 eisa_out8(0x01,0xa1); /* ICW4 */
284 eisa_out8(0x40,0xa0); /* OCW2 */
290 eisa_out8(slave_mask, 0xa1); /* OCW1 */
291 eisa_out8(master_mask, 0x21); /* OCW1 */
293 /* setup trig level */
294 EISA_DBG("EISA edge/level %04x\n", eisa_irq_level);
296 eisa_out8(eisa_irq_level&0xff, 0x4d0); /* Set all irq's to edge */
297 eisa_out8((eisa_irq_level >> 8) & 0xff, 0x4d1);
299 EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
300 EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
301 EISA_DBG("pic0 edge/level %02x\n", eisa_in8(0x4d0));
302 EISA_DBG("pic1 edge/level %02x\n", eisa_in8(0x4d1));
304 spin_unlock_irqrestore(&eisa_irq_lock, flags);
307 /* Device initialisation */
309 #define is_mongoose(dev) (dev->id.sversion == 0x00076)
311 static int __devinit eisa_probe(struct parisc_device *dev)
315 char *name = is_mongoose(dev) ? "Mongoose" : "Wax";
317 printk(KERN_INFO "%s EISA Adapter found at 0x%08lx\n",
320 eisa_dev.hba.dev = dev;
321 eisa_dev.hba.iommu = ccio_get_iommu(dev);
323 eisa_dev.hba.lmmio_space.name = "EISA";
324 eisa_dev.hba.lmmio_space.start = F_EXTEND(0xfc000000);
325 eisa_dev.hba.lmmio_space.end = F_EXTEND(0xffbfffff);
326 eisa_dev.hba.lmmio_space.flags = IORESOURCE_MEM;
327 result = ccio_request_resource(dev, &eisa_dev.hba.lmmio_space);
329 printk(KERN_ERR "EISA: failed to claim EISA Bus address space!\n");
332 eisa_dev.hba.io_space.name = "EISA";
333 eisa_dev.hba.io_space.start = 0;
334 eisa_dev.hba.io_space.end = 0xffff;
335 eisa_dev.hba.lmmio_space.flags = IORESOURCE_IO;
336 result = request_resource(&ioport_resource, &eisa_dev.hba.io_space);
338 printk(KERN_ERR "EISA: failed to claim EISA Bus port space!\n");
341 pcibios_register_hba(&eisa_dev.hba);
343 result = request_irq(dev->irq, eisa_irq, SA_SHIRQ, "EISA", &eisa_dev);
345 printk(KERN_ERR "EISA: request_irq failed!\n");
350 irq_desc[2].action = &irq2_action;
352 for (i = 0; i < 16; i++) {
353 irq_desc[i].handler = &eisa_interrupt_type;
358 if (dev->num_addrs) {
359 /* newer firmware hand out the eeprom address */
360 eisa_dev.eeprom_addr = dev->addr[0];
362 /* old firmware, need to figure out the box */
363 if (is_mongoose(dev)) {
364 eisa_dev.eeprom_addr = SNAKES_EEPROM_BASE_ADDR;
366 eisa_dev.eeprom_addr = MIRAGE_EEPROM_BASE_ADDR;
369 eisa_eeprom_addr = ioremap(eisa_dev.eeprom_addr, HPEE_MAX_LENGTH);
370 result = eisa_enumerator(eisa_dev.eeprom_addr, &eisa_dev.hba.io_space,
371 &eisa_dev.hba.lmmio_space);
375 /* FIXME : Don't enumerate the bus twice. */
376 eisa_dev.root.dev = &dev->dev;
377 dev->dev.driver_data = &eisa_dev.root;
378 eisa_dev.root.bus_base_addr = 0;
379 eisa_dev.root.res = &eisa_dev.hba.io_space;
380 eisa_dev.root.slots = result;
381 eisa_dev.root.dma_mask = 0xffffffff; /* wild guess */
382 if (eisa_root_register (&eisa_dev.root)) {
383 printk(KERN_ERR "EISA: Failed to register EISA root\n");
391 static struct parisc_device_id eisa_tbl[] = {
392 { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00076 }, /* Mongoose */
393 { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00090 }, /* Wax EISA */
397 MODULE_DEVICE_TABLE(parisc, eisa_tbl);
399 static struct parisc_driver eisa_driver = {
400 .name = "EISA Bus Adapter",
401 .id_table = eisa_tbl,
405 void __init eisa_init(void)
407 register_parisc_driver(&eisa_driver);
411 static unsigned int eisa_irq_configured;
412 void eisa_make_irq_level(int num)
414 if (eisa_irq_configured& (1<<num)) {
416 "IRQ %d polarity configured twice (last to level)\n",
419 eisa_irq_level |= (1<<num); /* set the corresponding bit */
420 eisa_irq_configured |= (1<<num); /* set the corresponding bit */
423 void eisa_make_irq_edge(int num)
425 if (eisa_irq_configured& (1<<num)) {
427 "IRQ %d polarity configured twice (last to edge)\n",
430 eisa_irq_level &= ~(1<<num); /* clear the corresponding bit */
431 eisa_irq_configured |= (1<<num); /* set the corresponding bit */
434 static int __init eisa_irq_setup(char *str)
439 EISA_DBG("IRQ setup\n");
440 while (cur != NULL) {
443 val = (int) simple_strtoul(cur, &pe, 0);
444 if (val > 15 || val < 0) {
445 printk(KERN_ERR "eisa: EISA irq value are 0-15\n");
451 eisa_make_irq_edge(val); /* clear the corresponding bit */
452 EISA_DBG("setting IRQ %d to edge-triggered mode\n", val);
454 if ((cur = strchr(cur, ','))) {
463 __setup("eisa_irq_edge=", eisa_irq_setup);