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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/parport/parport_gsc.c | |
download | kernel_samsung_espresso10-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_espresso10-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_espresso10-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/parport/parport_gsc.c')
-rw-r--r-- | drivers/parport/parport_gsc.c | 437 |
1 files changed, 437 insertions, 0 deletions
diff --git a/drivers/parport/parport_gsc.c b/drivers/parport/parport_gsc.c new file mode 100644 index 0000000..02d72ac --- /dev/null +++ b/drivers/parport/parport_gsc.c @@ -0,0 +1,437 @@ +/* + * Low-level parallel-support for PC-style hardware integrated in the + * LASI-Controller (on GSC-Bus) for HP-PARISC Workstations + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * (C) 1999-2001 by Helge Deller <deller@gmx.de> + * + * + * based on parport_pc.c by + * Grant Guenther <grant@torque.net> + * Phil Blundell <philb@gnu.org> + * Tim Waugh <tim@cyberelk.demon.co.uk> + * Jose Renau <renau@acm.org> + * David Campbell <campbell@torque.net> + * Andrea Arcangeli + */ + +#undef DEBUG /* undef for production */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/sched.h> +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/pci.h> +#include <linux/sysctl.h> + +#include <asm/io.h> +#include <asm/dma.h> +#include <asm/uaccess.h> +#include <asm/superio.h> + +#include <linux/parport.h> +#include <asm/pdc.h> +#include <asm/parisc-device.h> +#include <asm/hardware.h> +#include "parport_gsc.h" + + +MODULE_AUTHOR("Helge Deller <deller@gmx.de>"); +MODULE_DESCRIPTION("HP-PARISC PC-style parallel port driver"); +MODULE_SUPPORTED_DEVICE("integrated PC-style parallel port"); +MODULE_LICENSE("GPL"); + + +/* + * Clear TIMEOUT BIT in EPP MODE + * + * This is also used in SPP detection. + */ +static int clear_epp_timeout(struct parport *pb) +{ + unsigned char r; + + if (!(parport_gsc_read_status(pb) & 0x01)) + return 1; + + /* To clear timeout some chips require double read */ + parport_gsc_read_status(pb); + r = parport_gsc_read_status(pb); + parport_writeb (r | 0x01, STATUS (pb)); /* Some reset by writing 1 */ + parport_writeb (r & 0xfe, STATUS (pb)); /* Others by writing 0 */ + r = parport_gsc_read_status(pb); + + return !(r & 0x01); +} + +/* + * Access functions. + * + * Most of these aren't static because they may be used by the + * parport_xxx_yyy macros. extern __inline__ versions of several + * of these are in parport_gsc.h. + */ + +static irqreturn_t parport_gsc_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + parport_generic_irq(irq, (struct parport *) dev_id, regs); + return IRQ_HANDLED; +} + +void parport_gsc_init_state(struct pardevice *dev, struct parport_state *s) +{ + s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0); +} + +void parport_gsc_save_state(struct parport *p, struct parport_state *s) +{ + s->u.pc.ctr = parport_readb (CONTROL (p)); +} + +void parport_gsc_restore_state(struct parport *p, struct parport_state *s) +{ + parport_writeb (s->u.pc.ctr, CONTROL (p)); +} + +struct parport_operations parport_gsc_ops = +{ + .write_data = parport_gsc_write_data, + .read_data = parport_gsc_read_data, + + .write_control = parport_gsc_write_control, + .read_control = parport_gsc_read_control, + .frob_control = parport_gsc_frob_control, + + .read_status = parport_gsc_read_status, + + .enable_irq = parport_gsc_enable_irq, + .disable_irq = parport_gsc_disable_irq, + + .data_forward = parport_gsc_data_forward, + .data_reverse = parport_gsc_data_reverse, + + .init_state = parport_gsc_init_state, + .save_state = parport_gsc_save_state, + .restore_state = parport_gsc_restore_state, + + .epp_write_data = parport_ieee1284_epp_write_data, + .epp_read_data = parport_ieee1284_epp_read_data, + .epp_write_addr = parport_ieee1284_epp_write_addr, + .epp_read_addr = parport_ieee1284_epp_read_addr, + + .ecp_write_data = parport_ieee1284_ecp_write_data, + .ecp_read_data = parport_ieee1284_ecp_read_data, + .ecp_write_addr = parport_ieee1284_ecp_write_addr, + + .compat_write_data = parport_ieee1284_write_compat, + .nibble_read_data = parport_ieee1284_read_nibble, + .byte_read_data = parport_ieee1284_read_byte, + + .owner = THIS_MODULE, +}; + +/* --- Mode detection ------------------------------------- */ + +/* + * Checks for port existence, all ports support SPP MODE + */ +static int __devinit parport_SPP_supported(struct parport *pb) +{ + unsigned char r, w; + + /* + * first clear an eventually pending EPP timeout + * I (sailer@ife.ee.ethz.ch) have an SMSC chipset + * that does not even respond to SPP cycles if an EPP + * timeout is pending + */ + clear_epp_timeout(pb); + + /* Do a simple read-write test to make sure the port exists. */ + w = 0xc; + parport_writeb (w, CONTROL (pb)); + + /* Is there a control register that we can read from? Some + * ports don't allow reads, so read_control just returns a + * software copy. Some ports _do_ allow reads, so bypass the + * software copy here. In addition, some bits aren't + * writable. */ + r = parport_readb (CONTROL (pb)); + if ((r & 0xf) == w) { + w = 0xe; + parport_writeb (w, CONTROL (pb)); + r = parport_readb (CONTROL (pb)); + parport_writeb (0xc, CONTROL (pb)); + if ((r & 0xf) == w) + return PARPORT_MODE_PCSPP; + } + + /* Try the data register. The data lines aren't tri-stated at + * this stage, so we expect back what we wrote. */ + w = 0xaa; + parport_gsc_write_data (pb, w); + r = parport_gsc_read_data (pb); + if (r == w) { + w = 0x55; + parport_gsc_write_data (pb, w); + r = parport_gsc_read_data (pb); + if (r == w) + return PARPORT_MODE_PCSPP; + } + + return 0; +} + +/* Detect PS/2 support. + * + * Bit 5 (0x20) sets the PS/2 data direction; setting this high + * allows us to read data from the data lines. In theory we would get back + * 0xff but any peripheral attached to the port may drag some or all of the + * lines down to zero. So if we get back anything that isn't the contents + * of the data register we deem PS/2 support to be present. + * + * Some SPP ports have "half PS/2" ability - you can't turn off the line + * drivers, but an external peripheral with sufficiently beefy drivers of + * its own can overpower them and assert its own levels onto the bus, from + * where they can then be read back as normal. Ports with this property + * and the right type of device attached are likely to fail the SPP test, + * (as they will appear to have stuck bits) and so the fact that they might + * be misdetected here is rather academic. + */ + +static int __devinit parport_PS2_supported(struct parport *pb) +{ + int ok = 0; + + clear_epp_timeout(pb); + + /* try to tri-state the buffer */ + parport_gsc_data_reverse (pb); + + parport_gsc_write_data(pb, 0x55); + if (parport_gsc_read_data(pb) != 0x55) ok++; + + parport_gsc_write_data(pb, 0xaa); + if (parport_gsc_read_data(pb) != 0xaa) ok++; + + /* cancel input mode */ + parport_gsc_data_forward (pb); + + if (ok) { + pb->modes |= PARPORT_MODE_TRISTATE; + } else { + struct parport_gsc_private *priv = pb->private_data; + priv->ctr_writable &= ~0x20; + } + + return ok; +} + + +/* --- Initialisation code -------------------------------- */ + +struct parport *__devinit parport_gsc_probe_port (unsigned long base, + unsigned long base_hi, + int irq, int dma, + struct pci_dev *dev) +{ + struct parport_gsc_private *priv; + struct parport_operations *ops; + struct parport tmp; + struct parport *p = &tmp; + + priv = kmalloc (sizeof (struct parport_gsc_private), GFP_KERNEL); + if (!priv) { + printk (KERN_DEBUG "parport (0x%lx): no memory!\n", base); + return NULL; + } + ops = kmalloc (sizeof (struct parport_operations), GFP_KERNEL); + if (!ops) { + printk (KERN_DEBUG "parport (0x%lx): no memory for ops!\n", + base); + kfree (priv); + return NULL; + } + memcpy (ops, &parport_gsc_ops, sizeof (struct parport_operations)); + priv->ctr = 0xc; + priv->ctr_writable = 0xff; + priv->dma_buf = 0; + priv->dma_handle = 0; + priv->dev = dev; + p->base = base; + p->base_hi = base_hi; + p->irq = irq; + p->dma = dma; + p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT; + p->ops = ops; + p->private_data = priv; + p->physport = p; + if (!parport_SPP_supported (p)) { + /* No port. */ + kfree (priv); + return NULL; + } + parport_PS2_supported (p); + + if (!(p = parport_register_port(base, PARPORT_IRQ_NONE, + PARPORT_DMA_NONE, ops))) { + kfree (priv); + kfree (ops); + return NULL; + } + + p->base_hi = base_hi; + p->modes = tmp.modes; + p->size = (p->modes & PARPORT_MODE_EPP)?8:3; + p->private_data = priv; + + printk(KERN_INFO "%s: PC-style at 0x%lx", p->name, p->base); + p->irq = irq; + if (p->irq == PARPORT_IRQ_AUTO) { + p->irq = PARPORT_IRQ_NONE; + } + if (p->irq != PARPORT_IRQ_NONE) { + printk(", irq %d", p->irq); + + if (p->dma == PARPORT_DMA_AUTO) { + p->dma = PARPORT_DMA_NONE; + } + } + if (p->dma == PARPORT_DMA_AUTO) /* To use DMA, giving the irq + is mandatory (see above) */ + p->dma = PARPORT_DMA_NONE; + + printk(" ["); +#define printmode(x) {if(p->modes&PARPORT_MODE_##x){printk("%s%s",f?",":"",#x);f++;}} + { + int f = 0; + printmode(PCSPP); + printmode(TRISTATE); + printmode(COMPAT) + printmode(EPP); +// printmode(ECP); +// printmode(DMA); + } +#undef printmode + printk("]\n"); + + if (p->irq != PARPORT_IRQ_NONE) { + if (request_irq (p->irq, parport_gsc_interrupt, + 0, p->name, p)) { + printk (KERN_WARNING "%s: irq %d in use, " + "resorting to polled operation\n", + p->name, p->irq); + p->irq = PARPORT_IRQ_NONE; + p->dma = PARPORT_DMA_NONE; + } + } + + /* Done probing. Now put the port into a sensible start-up state. */ + + parport_gsc_write_data(p, 0); + parport_gsc_data_forward (p); + + /* Now that we've told the sharing engine about the port, and + found out its characteristics, let the high-level drivers + know about it. */ + parport_announce_port (p); + + return p; +} + + +#define PARPORT_GSC_OFFSET 0x800 + +static int __initdata parport_count; + +static int __devinit parport_init_chip(struct parisc_device *dev) +{ + struct parport *p; + unsigned long port; + + if (!dev->irq) { + printk("IRQ not found for parallel device at 0x%lx\n", dev->hpa); + return -ENODEV; + } + + port = dev->hpa + PARPORT_GSC_OFFSET; + + /* some older machines with ASP-chip don't support + * the enhanced parport modes. + */ + if (boot_cpu_data.cpu_type > pcxt && !pdc_add_valid(port+4)) { + + /* Initialize bidirectional-mode (0x10) & data-tranfer-mode #1 (0x20) */ + printk("%s: initialize bidirectional-mode.\n", __FUNCTION__); + parport_writeb ( (0x10 + 0x20), port + 4); + + } else { + printk("%s: enhanced parport-modes not supported.\n", __FUNCTION__); + } + + p = parport_gsc_probe_port(port, 0, dev->irq, + /* PARPORT_IRQ_NONE */ PARPORT_DMA_NONE, NULL); + if (p) + parport_count++; + dev->dev.driver_data = p; + + return 0; +} + +static int __devexit parport_remove_chip(struct parisc_device *dev) +{ + struct parport *p = dev->dev.driver_data; + if (p) { + struct parport_gsc_private *priv = p->private_data; + struct parport_operations *ops = p->ops; + parport_remove_port(p); + if (p->dma != PARPORT_DMA_NONE) + free_dma(p->dma); + if (p->irq != PARPORT_IRQ_NONE) + free_irq(p->irq, p); + if (priv->dma_buf) + pci_free_consistent(priv->dev, PAGE_SIZE, + priv->dma_buf, + priv->dma_handle); + kfree (p->private_data); + parport_put_port(p); + kfree (ops); /* hope no-one cached it */ + } + return 0; +} + +static struct parisc_device_id parport_tbl[] = { + { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x74 }, + { 0, } +}; + +MODULE_DEVICE_TABLE(parisc, parport_tbl); + +static struct parisc_driver parport_driver = { + .name = "Parallel", + .id_table = parport_tbl, + .probe = parport_init_chip, + .remove = __devexit_p(parport_remove_chip), +}; + +int __devinit parport_gsc_init(void) +{ + return register_parisc_driver(&parport_driver); +} + +static void __devexit parport_gsc_exit(void) +{ + unregister_parisc_driver(&parport_driver); +} + +module_init(parport_gsc_init); +module_exit(parport_gsc_exit); |