/* $Id: ffb_drv.c,v 1.16 2001/10/18 16:00:24 davem Exp $
 * ffb_drv.c: Creator/Creator3D direct rendering driver.
 *
 * Copyright (C) 2000 David S. Miller (davem@redhat.com)
 */

#include <linux/config.h>
#include "ffb.h"
#include "drmP.h"

#include "ffb_drv.h"

#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <asm/shmparam.h>
#include <asm/oplib.h>
#include <asm/upa.h>

#define DRIVER_AUTHOR		"David S. Miller"

#define DRIVER_NAME		"ffb"
#define DRIVER_DESC		"Creator/Creator3D"
#define DRIVER_DATE		"20000517"

#define DRIVER_MAJOR		0
#define DRIVER_MINOR		0
#define DRIVER_PATCHLEVEL	1

typedef struct _ffb_position_t {
	int node;
	int root;
} ffb_position_t;

static ffb_position_t *ffb_position;

static void get_ffb_type(ffb_dev_priv_t *ffb_priv, int instance)
{
	volatile unsigned char *strap_bits;
	unsigned char val;

	strap_bits = (volatile unsigned char *)
		(ffb_priv->card_phys_base + 0x00200000UL);

	/* Don't ask, you have to read the value twice for whatever
	 * reason to get correct contents.
	 */
	val = upa_readb(strap_bits);
	val = upa_readb(strap_bits);
	switch (val & 0x78) {
	case (0x0 << 5) | (0x0 << 3):
		ffb_priv->ffb_type = ffb1_prototype;
		printk("ffb%d: Detected FFB1 pre-FCS prototype\n", instance);
		break;
	case (0x0 << 5) | (0x1 << 3):
		ffb_priv->ffb_type = ffb1_standard;
		printk("ffb%d: Detected FFB1\n", instance);
		break;
	case (0x0 << 5) | (0x3 << 3):
		ffb_priv->ffb_type = ffb1_speedsort;
		printk("ffb%d: Detected FFB1-SpeedSort\n", instance);
		break;
	case (0x1 << 5) | (0x0 << 3):
		ffb_priv->ffb_type = ffb2_prototype;
		printk("ffb%d: Detected FFB2/vertical pre-FCS prototype\n", instance);
		break;
	case (0x1 << 5) | (0x1 << 3):
		ffb_priv->ffb_type = ffb2_vertical;
		printk("ffb%d: Detected FFB2/vertical\n", instance);
		break;
	case (0x1 << 5) | (0x2 << 3):
		ffb_priv->ffb_type = ffb2_vertical_plus;
		printk("ffb%d: Detected FFB2+/vertical\n", instance);
		break;
	case (0x2 << 5) | (0x0 << 3):
		ffb_priv->ffb_type = ffb2_horizontal;
		printk("ffb%d: Detected FFB2/horizontal\n", instance);
		break;
	case (0x2 << 5) | (0x2 << 3):
		ffb_priv->ffb_type = ffb2_horizontal;
		printk("ffb%d: Detected FFB2+/horizontal\n", instance);
		break;
	default:
		ffb_priv->ffb_type = ffb2_vertical;
		printk("ffb%d: Unknown boardID[%08x], assuming FFB2\n", instance, val);
		break;
	};
}

static void ffb_apply_upa_parent_ranges(int parent, 
					struct linux_prom64_registers *regs)
{
	struct linux_prom64_ranges ranges[PROMREG_MAX];
	char name[128];
	int len, i;

	prom_getproperty(parent, "name", name, sizeof(name));
	if (strcmp(name, "upa") != 0)
		return;

	len = prom_getproperty(parent, "ranges", (void *) ranges, sizeof(ranges));
	if (len <= 0)
		return;

	len /= sizeof(struct linux_prom64_ranges);
	for (i = 0; i < len; i++) {
		struct linux_prom64_ranges *rng = &ranges[i];
		u64 phys_addr = regs->phys_addr;

		if (phys_addr >= rng->ot_child_base &&
		    phys_addr < (rng->ot_child_base + rng->or_size)) {
			regs->phys_addr -= rng->ot_child_base;
			regs->phys_addr += rng->ot_parent_base;
			return;
		}
	}

	return;
}

static int ffb_init_one(drm_device_t *dev, int prom_node, int parent_node,
			int instance)
{
	struct linux_prom64_registers regs[2*PROMREG_MAX];
	ffb_dev_priv_t *ffb_priv = (ffb_dev_priv_t *)dev->dev_private;
	int i;

	ffb_priv->prom_node = prom_node;
	if (prom_getproperty(ffb_priv->prom_node, "reg",
			     (void *)regs, sizeof(regs)) <= 0) {
		return -EINVAL;
	}
	ffb_apply_upa_parent_ranges(parent_node, &regs[0]);
	ffb_priv->card_phys_base = regs[0].phys_addr;
	ffb_priv->regs = (ffb_fbcPtr)
		(regs[0].phys_addr + 0x00600000UL);
	get_ffb_type(ffb_priv, instance);
	for (i = 0; i < FFB_MAX_CTXS; i++)
		ffb_priv->hw_state[i] = NULL;
	
	return 0;
}

static drm_map_t *ffb_find_map(struct file *filp, unsigned long off)
{
	drm_file_t	*priv	= filp->private_data;
	drm_device_t	*dev;
	drm_map_list_t  *r_list;
	struct list_head *list;
	drm_map_t	*map;

	if (!priv || (dev = priv->dev) == NULL)
		return NULL;

	list_for_each(list, &dev->maplist->head) {
		unsigned long uoff;

		r_list = (drm_map_list_t *)list;
		map = r_list->map;
		if (!map)
			continue;
		uoff = (map->offset & 0xffffffff);
		if (uoff == off)
			return map;
	}

	return NULL;
}

unsigned long ffb_get_unmapped_area(struct file *filp,
				    unsigned long hint,
				    unsigned long len,
				    unsigned long pgoff,
				    unsigned long flags)
{
	drm_map_t *map = ffb_find_map(filp, pgoff << PAGE_SHIFT);
	unsigned long addr = -ENOMEM;

	if (!map)
		return get_unmapped_area(NULL, hint, len, pgoff, flags);

	if (map->type == _DRM_FRAME_BUFFER ||
	    map->type == _DRM_REGISTERS) {
#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
		addr = get_fb_unmapped_area(filp, hint, len, pgoff, flags);
#else
		addr = get_unmapped_area(NULL, hint, len, pgoff, flags);
#endif
	} else if (map->type == _DRM_SHM && SHMLBA > PAGE_SIZE) {
		unsigned long slack = SHMLBA - PAGE_SIZE;

		addr = get_unmapped_area(NULL, hint, len + slack, pgoff, flags);
		if (!(addr & ~PAGE_MASK)) {
			unsigned long kvirt = (unsigned long) map->handle;

			if ((kvirt & (SHMLBA - 1)) != (addr & (SHMLBA - 1))) {
				unsigned long koff, aoff;

				koff = kvirt & (SHMLBA - 1);
				aoff = addr & (SHMLBA - 1);
				if (koff < aoff)
					koff += SHMLBA;

				addr += (koff - aoff);
			}
		}
	} else {
		addr = get_unmapped_area(NULL, hint, len, pgoff, flags);
	}

	return addr;
}

static int ffb_presetup(drm_device_t *dev)
{
	ffb_dev_priv_t	*ffb_priv;
	int ret = 0;
	int i = 0;

	/* Check for the case where no device was found. */
	if (ffb_position == NULL)
		return -ENODEV;

	/* code used to use numdevs no numdevs anymore */
	ffb_priv = kmalloc(sizeof(ffb_dev_priv_t), GFP_KERNEL);
	if (!ffb_priv)
		return -ENOMEM;
	memset(ffb_priv, 0, sizeof(*ffb_priv));
	dev->dev_private = ffb_priv;

	ret = ffb_init_one(dev,
			   ffb_position[i].node,
			   ffb_position[i].root,
			   i);
	return ret;
}

static void ffb_driver_release(drm_device_t *dev, struct file *filp)
{
	ffb_dev_priv_t *fpriv = (ffb_dev_priv_t *) dev->dev_private;
	int context = _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock);
	int idx;

	idx = context - 1;
	if (fpriv &&
	    context != DRM_KERNEL_CONTEXT &&
	    fpriv->hw_state[idx] != NULL) {
		kfree(fpriv->hw_state[idx]);
		fpriv->hw_state[idx] = NULL;
	}	
}

static void ffb_driver_pretakedown(drm_device_t *dev)
{
	if (dev->dev_private) kfree(dev->dev_private);
}

static int ffb_driver_postcleanup(drm_device_t *dev)
{
	if (ffb_position != NULL) kfree(ffb_position);
	return 0;
}

static void ffb_driver_kernel_context_switch_unlock(struct drm_device *dev, drm_lock_t *lock)
{
	dev->lock.filp = 0;
	{
		__volatile__ unsigned int *plock = &dev->lock.hw_lock->lock;
		unsigned int old, new, prev, ctx;
		
		ctx = lock->context;
		do {
			old  = *plock;
			new  = ctx;
			prev = cmpxchg(plock, old, new);
		} while (prev != old);
	}
	wake_up_interruptible(&dev->lock.lock_queue);
}

static unsigned long ffb_driver_get_map_ofs(drm_map_t *map)
{
	return (map->offset & 0xffffffff);
}

static unsigned long ffb_driver_get_reg_ofs(drm_device_t *dev)
{
       ffb_dev_priv_t *ffb_priv = (ffb_dev_priv_t *)dev->dev_private;
       
       if (ffb_priv)
               return ffb_priv->card_phys_base;
       
       return 0;
}

static int postinit( struct drm_device *dev, unsigned long flags ) 
{
	DRM_INFO( "Initialized %s %d.%d.%d %s on minor %d\n",
		DRIVER_NAME,
		DRIVER_MAJOR,
		DRIVER_MINOR,
		DRIVER_PATCHLEVEL,
		DRIVER_DATE,
		dev->minor
		);
	return 0;
}

static int version( drm_version_t *version )
{
	int len;

	version->version_major = DRIVER_MAJOR;
	version->version_minor = DRIVER_MINOR;
	version->version_patchlevel = DRIVER_PATCHLEVEL;
	DRM_COPY( version->name, DRIVER_NAME );
	DRM_COPY( version->date, DRIVER_DATE );
	DRM_COPY( version->desc, DRIVER_DESC );
	return 0;
}

static drm_ioctl_desc_t ioctls[] = {
	
};

static struct drm_driver driver = {
	.driver_features = 0,
	.dev_priv_size = sizeof(u32),
	.release = ffb_driver_release,
	.presetup = ffb_presetup,
	.pretakedown = ffb_driver_pretakedown,
	.postcleanup = ffb_driver_postcleanup,
	.kernel_context_switch = ffb_driver_context_switch,
	.kernel_context_switch_unlock = ffb_driver_kernel_context_switch_unlock,
	.get_map_ofs = ffb_driver_get_map_ofs,
	.get_reg_ofs = ffb_driver_get_reg_ofs,
	.postinit = postinit,
	.version = version,
	.ioctls = ioctls,
	.num_ioctls = DRM_ARRAY_SIZE(ioctls),
	.fops = {
		.owner = THIS_MODULE,
		.open = drm_open,
		.release = drm_release,
		.ioctl = drm_ioctl,
		.mmap = drm_mmap,
		.poll = drm_poll,
		.fasync = drm_fasync,
	},
};

static int __init ffb_init(void)
{
	return -ENODEV;
}

static void __exit ffb_exit(void)
{
}

module_init(ffb_init);
module_exit(ffb_exit);

MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL and additional rights");