drivers/char/drm/ffb_drv.c - maze/linux - Git at Google

 /* $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) {
 		r_list = (drm_map_list_t *) list;
 		map = r_list->map;
 		if (!map)
 			continue;
 		if (r_list->user_token == 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)
 {
 	kfree(dev->dev_private);
 }

 static int ffb_driver_postcleanup(drm_device_t * dev)
 {
 	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");
	/* $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) {
	r_list = (drm_map_list_t *) list;
	map = r_list->map;
	if (!map)
	continue;
	if (r_list->user_token == 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)
	{
	kfree(dev->dev_private);
	}

	static int ffb_driver_postcleanup(drm_device_t * dev)
	{
	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");