11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * i2c-pca-isa.c driver for PCA9564 on ISA boards 31da177e4SLinus Torvalds * Copyright (C) 2004 Arcom Control Systems 4c01b0831SWolfram Sang * Copyright (C) 2008 Pengutronix 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 71da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 81da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 91da177e4SLinus Torvalds * (at your option) any later version. 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, 121da177e4SLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 131da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 141da177e4SLinus Torvalds * GNU General Public License for more details. 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 171da177e4SLinus Torvalds * along with this program; if not, write to the Free Software 181da177e4SLinus Torvalds * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 191da177e4SLinus Torvalds */ 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds #include <linux/kernel.h> 221da177e4SLinus Torvalds #include <linux/ioport.h> 231da177e4SLinus Torvalds #include <linux/module.h> 241da177e4SLinus Torvalds #include <linux/moduleparam.h> 251da177e4SLinus Torvalds #include <linux/delay.h> 261da177e4SLinus Torvalds #include <linux/init.h> 271da177e4SLinus Torvalds #include <linux/interrupt.h> 281da177e4SLinus Torvalds #include <linux/wait.h> 295cedb05dSJean Delvare #include <linux/isa.h> 301da177e4SLinus Torvalds #include <linux/i2c.h> 311da177e4SLinus Torvalds #include <linux/i2c-algo-pca.h> 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds #include <asm/io.h> 341da177e4SLinus Torvalds #include <asm/irq.h> 351da177e4SLinus Torvalds 36c01b0831SWolfram Sang #define DRIVER "i2c-pca-isa" 371da177e4SLinus Torvalds #define IO_SIZE 4 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds static unsigned long base = 0x330; 401da177e4SLinus Torvalds static int irq = 10; 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds /* Data sheet recommends 59kHz for 100kHz operation due to variation 431da177e4SLinus Torvalds * in the actual clock rate */ 441da177e4SLinus Torvalds static int clock = I2C_PCA_CON_59kHz; 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds static wait_queue_head_t pca_wait; 471da177e4SLinus Torvalds 48c01b0831SWolfram Sang static void pca_isa_writebyte(void *pd, int reg, int val) 491da177e4SLinus Torvalds { 501da177e4SLinus Torvalds #ifdef DEBUG_IO 511da177e4SLinus Torvalds static char *names[] = { "T/O", "DAT", "ADR", "CON" }; 521da177e4SLinus Torvalds printk("*** write %s at %#lx <= %#04x\n", names[reg], base+reg, val); 531da177e4SLinus Torvalds #endif 541da177e4SLinus Torvalds outb(val, base+reg); 551da177e4SLinus Torvalds } 561da177e4SLinus Torvalds 57c01b0831SWolfram Sang static int pca_isa_readbyte(void *pd, int reg) 581da177e4SLinus Torvalds { 591da177e4SLinus Torvalds int res = inb(base+reg); 601da177e4SLinus Torvalds #ifdef DEBUG_IO 611da177e4SLinus Torvalds { 621da177e4SLinus Torvalds static char *names[] = { "STA", "DAT", "ADR", "CON" }; 631da177e4SLinus Torvalds printk("*** read %s => %#04x\n", names[reg], res); 641da177e4SLinus Torvalds } 651da177e4SLinus Torvalds #endif 661da177e4SLinus Torvalds return res; 671da177e4SLinus Torvalds } 681da177e4SLinus Torvalds 69c01b0831SWolfram Sang static int pca_isa_waitforcompletion(void *pd) 701da177e4SLinus Torvalds { 711da177e4SLinus Torvalds int ret = 0; 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds if (irq > -1) { 741da177e4SLinus Torvalds ret = wait_event_interruptible(pca_wait, 75c01b0831SWolfram Sang pca_isa_readbyte(pd, I2C_PCA_CON) & I2C_PCA_CON_SI); 761da177e4SLinus Torvalds } else { 77c01b0831SWolfram Sang while ((pca_isa_readbyte(pd, I2C_PCA_CON) & I2C_PCA_CON_SI) == 0) 781da177e4SLinus Torvalds udelay(100); 791da177e4SLinus Torvalds } 801da177e4SLinus Torvalds return ret; 811da177e4SLinus Torvalds } 821da177e4SLinus Torvalds 83c01b0831SWolfram Sang static void pca_isa_resetchip(void *pd) 84c01b0831SWolfram Sang { 85c01b0831SWolfram Sang /* apparently only an external reset will do it. not a lot can be done */ 86c01b0831SWolfram Sang printk(KERN_WARNING DRIVER ": Haven't figured out how to do a reset yet\n"); 87c01b0831SWolfram Sang } 88c01b0831SWolfram Sang 897d12e780SDavid Howells static irqreturn_t pca_handler(int this_irq, void *dev_id) { 901da177e4SLinus Torvalds wake_up_interruptible(&pca_wait); 911da177e4SLinus Torvalds return IRQ_HANDLED; 921da177e4SLinus Torvalds } 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds static struct i2c_algo_pca_data pca_isa_data = { 95c01b0831SWolfram Sang /* .data intentionally left NULL, not needed with ISA */ 961da177e4SLinus Torvalds .write_byte = pca_isa_writebyte, 971da177e4SLinus Torvalds .read_byte = pca_isa_readbyte, 98c01b0831SWolfram Sang .wait_for_completion = pca_isa_waitforcompletion, 99c01b0831SWolfram Sang .reset_chip = pca_isa_resetchip, 1001da177e4SLinus Torvalds }; 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds static struct i2c_adapter pca_isa_ops = { 1031da177e4SLinus Torvalds .owner = THIS_MODULE, 1041da177e4SLinus Torvalds .id = I2C_HW_A_ISA, 1051da177e4SLinus Torvalds .algo_data = &pca_isa_data, 1061da177e4SLinus Torvalds .name = "PCA9564 ISA Adapter", 107c01b0831SWolfram Sang .timeout = 100, 1081da177e4SLinus Torvalds }; 1091da177e4SLinus Torvalds 1105cedb05dSJean Delvare static int __devinit pca_isa_probe(struct device *dev, unsigned int id) 1111da177e4SLinus Torvalds { 1121da177e4SLinus Torvalds init_waitqueue_head(&pca_wait); 1131da177e4SLinus Torvalds 1145cedb05dSJean Delvare dev_info(dev, "i/o base %#08lx. irq %d\n", base, irq); 1151da177e4SLinus Torvalds 11668e1ee62SKumar Gala #ifdef CONFIG_PPC 117104cb574SChristian Krafft if (check_legacy_ioport(base)) { 118104cb574SChristian Krafft dev_err(dev, "I/O address %#08lx is not available\n", base); 119104cb574SChristian Krafft goto out; 120104cb574SChristian Krafft } 121104cb574SChristian Krafft #endif 122104cb574SChristian Krafft 1231da177e4SLinus Torvalds if (!request_region(base, IO_SIZE, "i2c-pca-isa")) { 1245cedb05dSJean Delvare dev_err(dev, "I/O address %#08lx is in use\n", base); 1251da177e4SLinus Torvalds goto out; 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds if (irq > -1) { 1291da177e4SLinus Torvalds if (request_irq(irq, pca_handler, 0, "i2c-pca-isa", &pca_isa_ops) < 0) { 1305cedb05dSJean Delvare dev_err(dev, "Request irq%d failed\n", irq); 1311da177e4SLinus Torvalds goto out_region; 1321da177e4SLinus Torvalds } 1331da177e4SLinus Torvalds } 1341da177e4SLinus Torvalds 135c01b0831SWolfram Sang pca_isa_data.i2c_clock = clock; 1361da177e4SLinus Torvalds if (i2c_pca_add_bus(&pca_isa_ops) < 0) { 1375cedb05dSJean Delvare dev_err(dev, "Failed to add i2c bus\n"); 1381da177e4SLinus Torvalds goto out_irq; 1391da177e4SLinus Torvalds } 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds return 0; 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds out_irq: 1441da177e4SLinus Torvalds if (irq > -1) 1451da177e4SLinus Torvalds free_irq(irq, &pca_isa_ops); 1461da177e4SLinus Torvalds out_region: 1471da177e4SLinus Torvalds release_region(base, IO_SIZE); 1481da177e4SLinus Torvalds out: 1491da177e4SLinus Torvalds return -ENODEV; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds 1525cedb05dSJean Delvare static int __devexit pca_isa_remove(struct device *dev, unsigned int id) 1531da177e4SLinus Torvalds { 1543269711bSJean Delvare i2c_del_adapter(&pca_isa_ops); 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds if (irq > 0) { 1571da177e4SLinus Torvalds disable_irq(irq); 1581da177e4SLinus Torvalds free_irq(irq, &pca_isa_ops); 1591da177e4SLinus Torvalds } 1601da177e4SLinus Torvalds release_region(base, IO_SIZE); 1615cedb05dSJean Delvare 1625cedb05dSJean Delvare return 0; 1635cedb05dSJean Delvare } 1645cedb05dSJean Delvare 1655cedb05dSJean Delvare static struct isa_driver pca_isa_driver = { 1665cedb05dSJean Delvare .probe = pca_isa_probe, 1675cedb05dSJean Delvare .remove = __devexit_p(pca_isa_remove), 1685cedb05dSJean Delvare .driver = { 1695cedb05dSJean Delvare .owner = THIS_MODULE, 170c01b0831SWolfram Sang .name = DRIVER, 1715cedb05dSJean Delvare } 1725cedb05dSJean Delvare }; 1735cedb05dSJean Delvare 1745cedb05dSJean Delvare static int __init pca_isa_init(void) 1755cedb05dSJean Delvare { 1765cedb05dSJean Delvare return isa_register_driver(&pca_isa_driver, 1); 1775cedb05dSJean Delvare } 1785cedb05dSJean Delvare 1795cedb05dSJean Delvare static void __exit pca_isa_exit(void) 1805cedb05dSJean Delvare { 1815cedb05dSJean Delvare isa_unregister_driver(&pca_isa_driver); 1821da177e4SLinus Torvalds } 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>"); 1851da177e4SLinus Torvalds MODULE_DESCRIPTION("ISA base PCA9564 driver"); 1861da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds module_param(base, ulong, 0); 1891da177e4SLinus Torvalds MODULE_PARM_DESC(base, "I/O base address"); 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds module_param(irq, int, 0); 1921da177e4SLinus Torvalds MODULE_PARM_DESC(irq, "IRQ"); 1931da177e4SLinus Torvalds module_param(clock, int, 0); 1941da177e4SLinus Torvalds MODULE_PARM_DESC(clock, "Clock rate as described in table 1 of PCA9564 datasheet"); 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds module_init(pca_isa_init); 1971da177e4SLinus Torvalds module_exit(pca_isa_exit); 198