X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=blobdiff_plain;f=drivers%2Fi2c%2Fbusses%2Fi2c-elektor.c;h=caa8e5c8bfbbdc6f8d4cfc844b59237466867e6d;hp=6930b660e508d8c4e4d54ed08f5a45f00bc106d2;hb=849c529f57020cc47085400edd5e641d95cd4faf;hpb=8ed693d29b25bbd88471ec043cc01581419d0481 diff --git a/drivers/i2c/busses/i2c-elektor.c b/drivers/i2c/busses/i2c-elektor.c index 6930b660e508..7f38c01fb3a0 100644 --- a/drivers/i2c/busses/i2c-elektor.c +++ b/drivers/i2c/busses/i2c-elektor.c @@ -19,10 +19,10 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* ------------------------------------------------------------------------- */ -/* With some changes from Kyösti Mälkki and even +/* With some changes from Kyösti Mälkki and even Frodo Looijaard */ -/* 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 @@ -35,6 +35,7 @@ #include #include +#include #include #include @@ -46,12 +47,14 @@ #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 */ @@ -60,40 +63,33 @@ static wait_queue_head_t pcf_wait; 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); } @@ -136,7 +132,7 @@ static void pcf_isa_waitforpin(void) { } -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); @@ -149,16 +145,40 @@ static int pcf_isa_init(void) { 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); @@ -176,57 +196,55 @@ static struct i2c_algo_pcf_data pcf_isa_data = { .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, + .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, .id = I2C_HW_P_ELEK, .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); @@ -236,23 +254,27 @@ static int __init i2c_pcfisa_init(void) /* 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; @@ -262,22 +284,54 @@ static int __init i2c_pcfisa_init(void) 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 ");