lasi.c
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上传日期:2013-04-10
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文件大小:6k
- /*
- * LASI Device Driver
- *
- * (c) Copyright 1999 Red Hat Software
- * Portions (c) Copyright 1999 The Puffin Group Inc.
- * Portions (c) Copyright 1999 Hewlett-Packard
- *
- * 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.
- *
- * by Alan Cox <alan@redhat.com> and
- * Alex deVries <adevries@thepuffingroup.com>
- */
- #include <linux/errno.h>
- #include <linux/init.h>
- #include <linux/irq.h>
- #include <linux/slab.h>
- #include <linux/module.h>
- #include <linux/pm.h>
- #include <linux/slab.h>
- #include <linux/types.h>
- #include <asm/gsc.h>
- #include <asm/hardware.h>
- #include <asm/led.h>
- #include "busdevice.h"
- #define LASI_VER 0xC008 /* LASI Version */
- #define LASI_IO_CONF 0x7FFFE /* LASI primary configuration register */
- #define LASI_IO_CONF2 0x7FFFF /* LASI secondary configuration register */
- static int lasi_choose_irq(struct parisc_device *dev)
- {
- int irq;
- /*
- ** "irq" bits below are numbered relative to most significant bit.
- */
- switch (dev->id.sversion) {
- case 0x74: irq = 24; break; /* Centronics */
- case 0x7B: irq = 18; break; /* Audio */
- case 0x81: irq = 17; break; /* Lasi itself */
- case 0x82: irq = 22; break; /* SCSI */
- case 0x83: irq = 11; break; /* Floppy */
- case 0x84: irq = 5; break; /* PS/2 Keyboard */
- case 0x87: irq = 13; break; /* ISDN */
- case 0x8A: irq = 23; break; /* LAN */
- case 0x8C: irq = 26; break; /* RS232 */
- case 0x8D: irq = (dev->hw_path == 13) ? 15 : 14;
- break; /* Telephone */
- default: irq = -1; break; /* unknown */
- }
- return irq;
- }
- static void __init
- lasi_init_irq(struct busdevice *this_lasi)
- {
- unsigned long lasi_base = this_lasi->hpa;
- /* Stop LASI barking for a bit */
- gsc_writel(0x00000000, lasi_base+OFFSET_IMR);
- /* clear pending interrupts */
- gsc_readl(lasi_base+OFFSET_IRR);
- /* We're not really convinced we want to reset the onboard
- * devices. Firmware does it for us...
- */
- /* Resets */
- /* gsc_writel(0xFFFFFFFF, lasi_base+0x2000);*/ /* Parallel */
- gsc_writel(0xFFFFFFFF, lasi_base+0x4004); /* Audio */
- /* gsc_writel(0xFFFFFFFF, lasi_base+0x5000);*/ /* Serial */
- /* gsc_writel(0xFFFFFFFF, lasi_base+0x6000);*/ /* SCSI */
- gsc_writel(0xFFFFFFFF, lasi_base+0x7000); /* LAN */
- gsc_writel(0xFFFFFFFF, lasi_base+0x8000); /* Keyboard */
- gsc_writel(0xFFFFFFFF, lasi_base+0xA000); /* FDC */
-
- /* Ok we hit it on the head with a hammer, our Dog is now
- ** comatose and muzzled. Devices will now unmask LASI
- ** interrupts as they are registered as irq's in the LASI range.
- */
- /* XXX: I thought it was `awks that got `it on the `ead with an
- * `ammer. -- willy
- */
- }
- /*
- ** lasi_led_init()
- **
- ** lasi_led_init() initializes the LED controller on the LASI.
- **
- ** Since Mirage and Electra machines use a different LED
- ** address register, we need to check for these machines
- ** explicitly.
- */
- #ifndef CONFIG_CHASSIS_LCD_LED
- #define lasi_led_init(x) /* nothing */
- #else
- void __init lasi_led_init(unsigned long lasi_hpa)
- {
- unsigned long datareg;
- switch (CPU_HVERSION) {
- /* Gecko machines have only one single LED, which can be permanently
- turned on by writing a zero into the power control register. */
- case 0x600: /* Gecko (712/60) */
- case 0x601: /* Gecko (712/80) */
- case 0x602: /* Gecko (712/100) */
- case 0x603: /* Anole 64 (743/64) */
- case 0x604: /* Anole 100 (743/100) */
- case 0x605: /* Gecko (712/120) */
- datareg = lasi_hpa + 0x0000C000;
- gsc_writeb(0, datareg);
- return; /* no need to register the LED interrupt-function */
- /* Mirage and Electra machines need special offsets */
- case 0x60A: /* Mirage Jr (715/64) */
- case 0x60B: /* Mirage 100 */
- case 0x60C: /* Mirage 100+ */
- case 0x60D: /* Electra 100 */
- case 0x60E: /* Electra 120 */
- datareg = lasi_hpa - 0x00020000;
- break;
- default:
- datareg = lasi_hpa + 0x0000C000;
- break;
- } /* switch() */
- register_led_driver(DISPLAY_MODEL_LASI, LED_CMD_REG_NONE, (char *)datareg);
- }
- #endif
- /*
- * lasi_power_off
- *
- * Function for lasi to turn off the power. This is accomplished by setting a
- * 1 to PWR_ON_L in the Power Control Register
- *
- */
- static unsigned long lasi_power_off_hpa;
- static void lasi_power_off(void)
- {
- unsigned long datareg;
- /* calculate addr of the Power Control Register */
- datareg = lasi_power_off_hpa + 0x0000C000;
- /* Power down the machine */
- gsc_writel(0x02, datareg);
- }
- int __init
- lasi_init_chip(struct parisc_device *dev)
- {
- struct busdevice *lasi;
- struct gsc_irq gsc_irq;
- int irq, ret;
- lasi = kmalloc(sizeof(struct busdevice), GFP_KERNEL);
- if (!lasi)
- return -ENOMEM;
- lasi->name = "Lasi";
- lasi->hpa = dev->hpa;
- /* Check the 4-bit (yes, only 4) version register */
- lasi->version = gsc_readl(lasi->hpa + LASI_VER) & 0xf;
- printk(KERN_INFO "%s version %d at 0x%lx found.n",
- lasi->name, lasi->version, lasi->hpa);
- /* initialize the chassis LEDs really early */
- lasi_led_init(lasi->hpa);
- /* Stop LASI barking for a bit */
- lasi_init_irq(lasi);
- /* the IRQ lasi should use */
- irq = gsc_alloc_irq(&gsc_irq);
- if (irq < 0) {
- printk(KERN_ERR "%s(): cannot get GSC irqn",
- __FUNCTION__);
- kfree(lasi);
- return -EBUSY;
- }
- ret = request_irq(gsc_irq.irq, busdev_barked, 0, "lasi", lasi);
- if (ret < 0) {
- kfree(lasi);
- return ret;
- }
- /* Save this for debugging later */
- lasi->parent_irq = gsc_irq.irq;
- lasi->eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;
- /* enable IRQ's for devices below LASI */
- gsc_writel(lasi->eim, lasi->hpa + OFFSET_IAR);
- /* Done init'ing, register this driver */
- ret = gsc_common_irqsetup(dev, lasi);
- if (ret) {
- kfree(lasi);
- return ret;
- }
- fixup_child_irqs(dev, lasi->busdev_region->data.irqbase,
- lasi_choose_irq);
- /* initialize the power off function */
- /* FIXME: Record the LASI HPA for the power off function. This should
- * ensure that only the first LASI (the one controlling the power off)
- * should set the HPA here */
- lasi_power_off_hpa = lasi->hpa;
- pm_power_off = lasi_power_off;
-
- return ret;
- }
- static struct parisc_device_id lasi_tbl[] = {
- { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00081 },
- { 0, }
- };
- struct parisc_driver lasi_driver = {
- name: "Lasi",
- id_table: lasi_tbl,
- probe: lasi_init_chip,
- };