1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * eisa.c - provide support for EISA adapters in PA-RISC machines
5 * Copyright (c) 2001 Matthew Wilcox for Hewlett Packard
6 * Copyright (c) 2001 Daniel Engstrom <5116@telia.com>
8 * There are two distinct EISA adapters. Mongoose is found in machines
9 * before the 712; then the Wax ASIC is used. To complicate matters, the
10 * Wax ASIC also includes a PS/2 and RS-232 controller, but those are
11 * dealt with elsewhere; this file is concerned only with the EISA portions
16 * To allow an ISA card to work properly in the EISA slot you need to
17 * set an edge trigger level. This may be done on the palo command line
18 * by adding the kernel parameter "eisa_irq_edge=n,n2,[...]]", with
19 * n and n2 as the irq levels you want to use.
21 * Example: "eisa_irq_edge=10,11" allows ISA cards to operate at
22 * irq levels 10 and 11.
25 #include <linux/init.h>
26 #include <linux/ioport.h>
27 #include <linux/interrupt.h>
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/pci.h>
31 #include <linux/spinlock.h>
32 #include <linux/eisa.h>
34 #include <asm/byteorder.h>
36 #include <asm/hardware.h>
37 #include <asm/processor.h>
38 #include <asm/parisc-device.h>
39 #include <asm/delay.h>
40 #include <asm/eisa_bus.h>
41 #include <asm/eisa_eeprom.h>
46 #define EISA_DBG(msg, arg...) printk(KERN_DEBUG "eisa: " msg, ## arg)
48 #define EISA_DBG(msg, arg...)
51 #define SNAKES_EEPROM_BASE_ADDR 0xF0810400
52 #define MIRAGE_EEPROM_BASE_ADDR 0xF00C0400
54 static DEFINE_SPINLOCK(eisa_irq_lock);
56 void __iomem *eisa_eeprom_addr __read_mostly;
58 /* We can only have one EISA adapter in the system because neither
59 * implementation can be flexed.
61 static struct eisa_ba {
62 struct pci_hba_data hba;
63 unsigned long eeprom_addr;
64 struct eisa_root_device root;
69 static inline unsigned long eisa_permute(unsigned short port)
72 return 0xfc000000 | ((port & 0xfc00) >> 6)
73 | ((port & 0x3f8) << 9) | (port & 7);
75 return 0xfc000000 | port;
79 unsigned char eisa_in8(unsigned short port)
82 return gsc_readb(eisa_permute(port));
86 unsigned short eisa_in16(unsigned short port)
89 return le16_to_cpu(gsc_readw(eisa_permute(port)));
93 unsigned int eisa_in32(unsigned short port)
96 return le32_to_cpu(gsc_readl(eisa_permute(port)));
100 void eisa_out8(unsigned char data, unsigned short port)
103 gsc_writeb(data, eisa_permute(port));
106 void eisa_out16(unsigned short data, unsigned short port)
109 gsc_writew(cpu_to_le16(data), eisa_permute(port));
112 void eisa_out32(unsigned int data, unsigned short port)
115 gsc_writel(cpu_to_le32(data), eisa_permute(port));
119 /* We call these directly without PCI. See asm/io.h. */
120 EXPORT_SYMBOL(eisa_in8);
121 EXPORT_SYMBOL(eisa_in16);
122 EXPORT_SYMBOL(eisa_in32);
123 EXPORT_SYMBOL(eisa_out8);
124 EXPORT_SYMBOL(eisa_out16);
125 EXPORT_SYMBOL(eisa_out32);
128 /* Interrupt handling */
130 /* cached interrupt mask registers */
131 static int master_mask;
132 static int slave_mask;
134 /* the trig level can be set with the
135 * eisa_irq_edge=n,n,n commandline parameter
136 * We should really read this from the EEPROM
139 /* irq 13,8,2,1,0 must be edge */
140 static unsigned int eisa_irq_level __read_mostly; /* default to edge triggered */
143 /* called by free irq */
144 static void eisa_mask_irq(struct irq_data *d)
146 unsigned int irq = d->irq;
149 EISA_DBG("disable irq %d\n", irq);
150 /* just mask for now */
151 spin_lock_irqsave(&eisa_irq_lock, flags);
153 slave_mask |= (1 << (irq&7));
154 eisa_out8(slave_mask, 0xa1);
156 master_mask |= (1 << (irq&7));
157 eisa_out8(master_mask, 0x21);
159 spin_unlock_irqrestore(&eisa_irq_lock, flags);
160 EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
161 EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
164 /* called by request irq */
165 static void eisa_unmask_irq(struct irq_data *d)
167 unsigned int irq = d->irq;
169 EISA_DBG("enable irq %d\n", irq);
171 spin_lock_irqsave(&eisa_irq_lock, flags);
173 slave_mask &= ~(1 << (irq&7));
174 eisa_out8(slave_mask, 0xa1);
176 master_mask &= ~(1 << (irq&7));
177 eisa_out8(master_mask, 0x21);
179 spin_unlock_irqrestore(&eisa_irq_lock, flags);
180 EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
181 EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
184 static struct irq_chip eisa_interrupt_type = {
186 .irq_unmask = eisa_unmask_irq,
187 .irq_mask = eisa_mask_irq,
190 static irqreturn_t eisa_irq(int wax_irq, void *intr_dev)
192 int irq = gsc_readb(0xfc01f000); /* EISA supports 16 irqs */
195 spin_lock_irqsave(&eisa_irq_lock, flags);
196 /* read IRR command */
197 eisa_out8(0x0a, 0x20);
198 eisa_out8(0x0a, 0xa0);
200 EISA_DBG("irq IAR %02x 8259-1 irr %02x 8259-2 irr %02x\n",
201 irq, eisa_in8(0x20), eisa_in8(0xa0));
203 /* read ISR command */
204 eisa_out8(0x0a, 0x20);
205 eisa_out8(0x0a, 0xa0);
206 EISA_DBG("irq 8259-1 isr %02x imr %02x 8259-2 isr %02x imr %02x\n",
207 eisa_in8(0x20), eisa_in8(0x21), eisa_in8(0xa0), eisa_in8(0xa1));
211 /* mask irq and write eoi */
213 slave_mask |= (1 << (irq&7));
214 eisa_out8(slave_mask, 0xa1);
215 eisa_out8(0x60 | (irq&7),0xa0);/* 'Specific EOI' to slave */
216 eisa_out8(0x62, 0x20); /* 'Specific EOI' to master-IRQ2 */
219 master_mask |= (1 << (irq&7));
220 eisa_out8(master_mask, 0x21);
221 eisa_out8(0x60|irq, 0x20); /* 'Specific EOI' to master */
223 spin_unlock_irqrestore(&eisa_irq_lock, flags);
225 generic_handle_irq(irq);
227 spin_lock_irqsave(&eisa_irq_lock, flags);
230 slave_mask &= ~(1 << (irq&7));
231 eisa_out8(slave_mask, 0xa1);
233 master_mask &= ~(1 << (irq&7));
234 eisa_out8(master_mask, 0x21);
236 spin_unlock_irqrestore(&eisa_irq_lock, flags);
240 static irqreturn_t dummy_irq2_handler(int _, void *dev)
242 printk(KERN_ALERT "eisa: uhh, irq2?\n");
246 static void init_eisa_pic(void)
250 spin_lock_irqsave(&eisa_irq_lock, flags);
252 eisa_out8(0xff, 0x21); /* mask during init */
253 eisa_out8(0xff, 0xa1); /* mask during init */
256 eisa_out8(0x11, 0x20); /* ICW1 */
257 eisa_out8(0x00, 0x21); /* ICW2 */
258 eisa_out8(0x04, 0x21); /* ICW3 */
259 eisa_out8(0x01, 0x21); /* ICW4 */
260 eisa_out8(0x40, 0x20); /* OCW2 */
263 eisa_out8(0x11, 0xa0); /* ICW1 */
264 eisa_out8(0x08, 0xa1); /* ICW2 */
265 eisa_out8(0x02, 0xa1); /* ICW3 */
266 eisa_out8(0x01, 0xa1); /* ICW4 */
267 eisa_out8(0x40, 0xa0); /* OCW2 */
273 eisa_out8(slave_mask, 0xa1); /* OCW1 */
274 eisa_out8(master_mask, 0x21); /* OCW1 */
276 /* setup trig level */
277 EISA_DBG("EISA edge/level %04x\n", eisa_irq_level);
279 eisa_out8(eisa_irq_level&0xff, 0x4d0); /* Set all irq's to edge */
280 eisa_out8((eisa_irq_level >> 8) & 0xff, 0x4d1);
282 EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
283 EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
284 EISA_DBG("pic0 edge/level %02x\n", eisa_in8(0x4d0));
285 EISA_DBG("pic1 edge/level %02x\n", eisa_in8(0x4d1));
287 spin_unlock_irqrestore(&eisa_irq_lock, flags);
290 /* Device initialisation */
292 #define is_mongoose(dev) (dev->id.sversion == 0x00076)
294 static int __init eisa_probe(struct parisc_device *dev)
298 char *name = is_mongoose(dev) ? "Mongoose" : "Wax";
300 printk(KERN_INFO "%s EISA Adapter found at 0x%08lx\n",
301 name, (unsigned long)dev->hpa.start);
303 eisa_dev.hba.dev = dev;
304 eisa_dev.hba.iommu = ccio_get_iommu(dev);
306 eisa_dev.hba.lmmio_space.name = "EISA";
307 eisa_dev.hba.lmmio_space.start = F_EXTEND(0xfc000000);
308 eisa_dev.hba.lmmio_space.end = F_EXTEND(0xffbfffff);
309 eisa_dev.hba.lmmio_space.flags = IORESOURCE_MEM;
310 result = ccio_request_resource(dev, &eisa_dev.hba.lmmio_space);
312 printk(KERN_ERR "EISA: failed to claim EISA Bus address space!\n");
315 eisa_dev.hba.io_space.name = "EISA";
316 eisa_dev.hba.io_space.start = 0;
317 eisa_dev.hba.io_space.end = 0xffff;
318 eisa_dev.hba.lmmio_space.flags = IORESOURCE_IO;
319 result = request_resource(&ioport_resource, &eisa_dev.hba.io_space);
321 printk(KERN_ERR "EISA: failed to claim EISA Bus port space!\n");
324 pcibios_register_hba(&eisa_dev.hba);
326 result = request_irq(dev->irq, eisa_irq, IRQF_SHARED, "EISA", &eisa_dev);
328 printk(KERN_ERR "EISA: request_irq failed!\n");
333 if (request_irq(2, dummy_irq2_handler, 0, "cascade", NULL))
334 pr_err("Failed to request irq 2 (cascade)\n");
335 for (i = 0; i < 16; i++) {
336 irq_set_chip_and_handler(i, &eisa_interrupt_type,
342 if (dev->num_addrs) {
343 /* newer firmware hand out the eeprom address */
344 eisa_dev.eeprom_addr = dev->addr[0];
346 /* old firmware, need to figure out the box */
347 if (is_mongoose(dev)) {
348 eisa_dev.eeprom_addr = SNAKES_EEPROM_BASE_ADDR;
350 eisa_dev.eeprom_addr = MIRAGE_EEPROM_BASE_ADDR;
353 eisa_eeprom_addr = ioremap(eisa_dev.eeprom_addr, HPEE_MAX_LENGTH);
354 if (!eisa_eeprom_addr) {
356 printk(KERN_ERR "EISA: ioremap failed!\n");
359 result = eisa_enumerator(eisa_dev.eeprom_addr, &eisa_dev.hba.io_space,
360 &eisa_dev.hba.lmmio_space);
364 /* FIXME : Don't enumerate the bus twice. */
365 eisa_dev.root.dev = &dev->dev;
366 dev_set_drvdata(&dev->dev, &eisa_dev.root);
367 eisa_dev.root.bus_base_addr = 0;
368 eisa_dev.root.res = &eisa_dev.hba.io_space;
369 eisa_dev.root.slots = result;
370 eisa_dev.root.dma_mask = 0xffffffff; /* wild guess */
371 if (eisa_root_register (&eisa_dev.root)) {
372 printk(KERN_ERR "EISA: Failed to register EISA root\n");
381 iounmap(eisa_eeprom_addr);
383 free_irq(dev->irq, &eisa_dev);
385 release_resource(&eisa_dev.hba.io_space);
389 static const struct parisc_device_id eisa_tbl[] __initconst = {
390 { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00076 }, /* Mongoose */
391 { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00090 }, /* Wax EISA */
395 MODULE_DEVICE_TABLE(parisc, eisa_tbl);
397 static struct parisc_driver eisa_driver __refdata = {
399 .id_table = eisa_tbl,
403 void __init eisa_init(void)
405 register_parisc_driver(&eisa_driver);
409 static unsigned int eisa_irq_configured;
410 void eisa_make_irq_level(int num)
412 if (eisa_irq_configured& (1<<num)) {
414 "IRQ %d polarity configured twice (last to level)\n",
417 eisa_irq_level |= (1<<num); /* set the corresponding bit */
418 eisa_irq_configured |= (1<<num); /* set the corresponding bit */
421 void eisa_make_irq_edge(int num)
423 if (eisa_irq_configured& (1<<num)) {
425 "IRQ %d polarity configured twice (last to edge)\n",
428 eisa_irq_level &= ~(1<<num); /* clear the corresponding bit */
429 eisa_irq_configured |= (1<<num); /* set the corresponding bit */
432 static int __init eisa_irq_setup(char *str)
437 EISA_DBG("IRQ setup\n");
438 while (cur != NULL) {
441 val = (int) simple_strtoul(cur, &pe, 0);
442 if (val > 15 || val < 0) {
443 printk(KERN_ERR "eisa: EISA irq value are 0-15\n");
449 eisa_make_irq_edge(val); /* clear the corresponding bit */
450 EISA_DBG("setting IRQ %d to edge-triggered mode\n", val);
452 if ((cur = strchr(cur, ','))) {
461 __setup("eisa_irq_edge=", eisa_irq_setup);