Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* ------------------------------------------------------------------------- */
-/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
+/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
Frodo Looijaard <frodol@dds.nl> */
-/* Partialy rewriten by Oleg I. Vdovikin for mmapped support of
+/* Partialy rewriten by Oleg I. Vdovikin for mmapped support of
for Alpha Processor Inc. UP-2000(+) boards */
-#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/delay.h>
-#include <linux/slab.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/wait.h>
+#include <linux/isa.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-pcf.h>
#define DEFAULT_BASE 0x330
static int base;
+static u8 __iomem *base_iomem;
+
static int irq;
static int clock = 0x1c;
static int own = 0x55;
static int mmapped;
-/* vdovikin: removed static struct i2c_pcf_isa gpi; code -
+/* vdovikin: removed static struct i2c_pcf_isa gpi; code -
this module in real supports only one device, due to missing arguments
in some functions, called from the algo-pcf module. Sometimes it's
need to be rewriten - but for now just remove this for simpler reading */
static int pcf_pending;
static spinlock_t lock;
+static struct i2c_adapter pcf_isa_ops;
+
/* ----- local functions ---------------------------------------------- */
static void pcf_isa_setbyte(void *data, int ctl, int val)
{
- int address = ctl ? (base + 1) : base;
+ u8 __iomem *address = ctl ? (base_iomem + 1) : base_iomem;
/* enable irq if any specified for serial operation */
if (ctl && irq && (val & I2C_PCF_ESO)) {
val |= I2C_PCF_ENI;
}
- pr_debug("i2c-elektor: Write 0x%X 0x%02X\n", address, val & 255);
-
- switch (mmapped) {
- case 0: /* regular I/O */
- outb(val, address);
- break;
- case 2: /* double mapped I/O needed for UP2000 board,
- I don't know why this... */
- writeb(val, (void *)address);
- /* fall */
- case 1: /* memory mapped I/O */
- writeb(val, (void *)address);
- break;
- }
+ pr_debug("%s: Write %p 0x%02X\n", pcf_isa_ops.name, address, val);
+ iowrite8(val, address);
+#ifdef __alpha__
+ /* API UP2000 needs some hardware fudging to make the write stick */
+ iowrite8(val, address);
+#endif
}
static int pcf_isa_getbyte(void *data, int ctl)
{
- int address = ctl ? (base + 1) : base;
- int val = mmapped ? readb((void *)address) : inb(address);
-
- pr_debug("i2c-elektor: Read 0x%X 0x%02X\n", address, val);
+ u8 __iomem *address = ctl ? (base_iomem + 1) : base_iomem;
+ int val = ioread8(address);
+ pr_debug("%s: Read %p 0x%02X\n", pcf_isa_ops.name, address, val);
return (val);
}
return (clock);
}
-static void pcf_isa_waitforpin(void) {
+static void pcf_isa_waitforpin(void *data)
+{
DEFINE_WAIT(wait);
int timeout = 2;
unsigned long flags;
}
-static irqreturn_t pcf_isa_handler(int this_irq, void *dev_id, struct pt_regs *regs) {
+static irqreturn_t pcf_isa_handler(int this_irq, void *dev_id) {
spin_lock(&lock);
pcf_pending = 1;
spin_unlock(&lock);
{
spin_lock_init(&lock);
if (!mmapped) {
- if (!request_region(base, 2, "i2c (isa bus adapter)")) {
- printk(KERN_ERR
- "i2c-elektor: requested I/O region (0x%X:2) "
- "is in use.\n", base);
+ if (!request_region(base, 2, pcf_isa_ops.name)) {
+ printk(KERN_ERR "%s: requested I/O region (%#x:2) is "
+ "in use\n", pcf_isa_ops.name, base);
+ return -ENODEV;
+ }
+ base_iomem = ioport_map(base, 2);
+ if (!base_iomem) {
+ printk(KERN_ERR "%s: remap of I/O region %#x failed\n",
+ pcf_isa_ops.name, base);
+ release_region(base, 2);
+ return -ENODEV;
+ }
+ } else {
+ if (!request_mem_region(base, 2, pcf_isa_ops.name)) {
+ printk(KERN_ERR "%s: requested memory region (%#x:2) "
+ "is in use\n", pcf_isa_ops.name, base);
+ return -ENODEV;
+ }
+ base_iomem = ioremap(base, 2);
+ if (base_iomem == NULL) {
+ printk(KERN_ERR "%s: remap of memory region %#x "
+ "failed\n", pcf_isa_ops.name, base);
+ release_mem_region(base, 2);
return -ENODEV;
}
}
+ pr_debug("%s: registers %#x remapped to %p\n", pcf_isa_ops.name, base,
+ base_iomem);
+
if (irq > 0) {
- if (request_irq(irq, pcf_isa_handler, 0, "PCF8584", NULL) < 0) {
- printk(KERN_ERR "i2c-elektor: Request irq%d failed\n", irq);
+ if (request_irq(irq, pcf_isa_handler, 0, pcf_isa_ops.name,
+ NULL) < 0) {
+ printk(KERN_ERR "%s: Request irq%d failed\n",
+ pcf_isa_ops.name, irq);
irq = 0;
} else
enable_irq(irq);
.getown = pcf_isa_getown,
.getclock = pcf_isa_getclock,
.waitforpin = pcf_isa_waitforpin,
- .udelay = 10,
- .mdelay = 10,
- .timeout = 100,
};
static struct i2c_adapter pcf_isa_ops = {
.owner = THIS_MODULE,
- .class = I2C_CLASS_HWMON,
- .id = I2C_HW_P_ELEK,
+ .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
.algo_data = &pcf_isa_data,
- .name = "PCF8584 ISA adapter",
+ .name = "i2c-elektor",
};
-static int __init i2c_pcfisa_init(void)
+static int __devinit elektor_match(struct device *dev, unsigned int id)
{
#ifdef __alpha__
- /* check to see we have memory mapped PCF8584 connected to the
+ /* check to see we have memory mapped PCF8584 connected to the
Cypress cy82c693 PCI-ISA bridge as on UP2000 board */
if (base == 0) {
struct pci_dev *cy693_dev;
-
- cy693_dev = pci_get_device(PCI_VENDOR_ID_CONTAQ,
+
+ cy693_dev = pci_get_device(PCI_VENDOR_ID_CONTAQ,
PCI_DEVICE_ID_CONTAQ_82C693, NULL);
if (cy693_dev) {
- char config;
+ unsigned char config;
/* yeap, we've found cypress, let's check config */
if (!pci_read_config_byte(cy693_dev, 0x47, &config)) {
-
- pr_debug("i2c-elektor: found cy82c693, config register 0x47 = 0x%02x.\n", config);
+
+ dev_dbg(dev, "found cy82c693, config "
+ "register 0x47 = 0x%02x\n", config);
/* UP2000 board has this register set to 0xe1,
- but the most significant bit as seems can be
+ but the most significant bit as seems can be
reset during the proper initialisation
- sequence if guys from API decides to do that
- (so, we can even enable Tsunami Pchip
- window for the upper 1 Gb) */
+ sequence if guys from API decides to do that
+ (so, we can even enable Tsunami Pchip
+ window for the upper 1 Gb) */
/* so just check for ROMCS at 0xe0000,
- ROMCS enabled for writes
+ ROMCS enabled for writes
and external XD Bus buffer in use. */
if ((config & 0x7f) == 0x61) {
/* seems to be UP2000 like board */
base = 0xe0000;
- /* I don't know why we need to
- write twice */
- mmapped = 2;
- /* UP2000 drives ISA with
+ mmapped = 1;
+ /* UP2000 drives ISA with
8.25 MHz (PCI/4) clock
(this can be read from cypress) */
clock = I2C_PCF_CLK | I2C_PCF_TRNS90;
- printk(KERN_INFO "i2c-elektor: found API UP2000 like board, will probe PCF8584 later.\n");
+ dev_info(dev, "found API UP2000 like "
+ "board, will probe PCF8584 "
+ "later\n");
}
}
pci_dev_put(cy693_dev);
/* sanity checks for mmapped I/O */
if (mmapped && base < 0xc8000) {
- printk(KERN_ERR "i2c-elektor: incorrect base address (0x%0X) specified for mmapped I/O.\n", base);
- return -ENODEV;
+ dev_err(dev, "incorrect base address (%#x) specified "
+ "for mmapped I/O\n", base);
+ return 0;
}
- printk(KERN_INFO "i2c-elektor: i2c pcf8584-isa adapter driver\n");
-
if (base == 0) {
base = DEFAULT_BASE;
}
+ return 1;
+}
+static int __devinit elektor_probe(struct device *dev, unsigned int id)
+{
init_waitqueue_head(&pcf_wait);
if (pcf_isa_init())
return -ENODEV;
+ pcf_isa_ops.dev.parent = dev;
if (i2c_pcf_add_bus(&pcf_isa_ops) < 0)
goto fail;
-
- printk(KERN_ERR "i2c-elektor: found device at %#x.\n", base);
+
+ dev_info(dev, "found device at %#x\n", base);
return 0;
free_irq(irq, NULL);
}
- if (!mmapped)
- release_region(base , 2);
+ if (!mmapped) {
+ ioport_unmap(base_iomem);
+ release_region(base, 2);
+ } else {
+ iounmap(base_iomem);
+ release_mem_region(base, 2);
+ }
return -ENODEV;
}
-static void i2c_pcfisa_exit(void)
+static int __devexit elektor_remove(struct device *dev, unsigned int id)
{
- i2c_pcf_del_bus(&pcf_isa_ops);
+ i2c_del_adapter(&pcf_isa_ops);
if (irq > 0) {
disable_irq(irq);
free_irq(irq, NULL);
}
- if (!mmapped)
- release_region(base , 2);
+ if (!mmapped) {
+ ioport_unmap(base_iomem);
+ release_region(base, 2);
+ } else {
+ iounmap(base_iomem);
+ release_mem_region(base, 2);
+ }
+
+ return 0;
+}
+
+static struct isa_driver i2c_elektor_driver = {
+ .match = elektor_match,
+ .probe = elektor_probe,
+ .remove = __devexit_p(elektor_remove),
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "i2c-elektor",
+ },
+};
+
+static int __init i2c_pcfisa_init(void)
+{
+ return isa_register_driver(&i2c_elektor_driver, 1);
+}
+
+static void __exit i2c_pcfisa_exit(void)
+{
+ isa_unregister_driver(&i2c_elektor_driver);
}
MODULE_AUTHOR("Hans Berglund <hb@spacetec.no>");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff