drivers/video/fbdev/p9100.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /* p9100.c: P9100 frame buffer driver
  *
  * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
  * Copyright 1999 Derrick J Brashear (shadow@dementia.org)
  *
  * Driver layout based loosely on tgafb.c, see that file for credits.
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/fb.h>
 #include <linux/mm.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>

 #include <asm/io.h>
 #include <asm/fbio.h>

 #include "sbuslib.h"

 /*
  * Local functions.
  */

 static int p9100_setcolreg(unsigned, unsigned, unsigned, unsigned,
 			   unsigned, struct fb_info *);
 static int p9100_blank(int, struct fb_info *);

 static int p9100_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma);
 static int p9100_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg);

 /*
  *  Frame buffer operations
  */

 static const struct fb_ops p9100_ops = {
 	.owner			= THIS_MODULE,
 	FB_DEFAULT_SBUS_OPS(p9100),
 	.fb_setcolreg		= p9100_setcolreg,
 	.fb_blank		= p9100_blank,
 };

 /* P9100 control registers */
 #define P9100_SYSCTL_OFF	0x0UL
 #define P9100_VIDEOCTL_OFF	0x100UL
 #define P9100_VRAMCTL_OFF 	0x180UL
 #define P9100_RAMDAC_OFF 	0x200UL
 #define P9100_VIDEOCOPROC_OFF 	0x400UL

 /* P9100 command registers */
 #define P9100_CMD_OFF 0x0UL

 /* P9100 framebuffer memory */
 #define P9100_FB_OFF 0x0UL

 /* 3 bits: 2=8bpp 3=16bpp 5=32bpp 7=24bpp */
 #define SYS_CONFIG_PIXELSIZE_SHIFT 26

 #define SCREENPAINT_TIMECTL1_ENABLE_VIDEO 0x20 /* 0 = off, 1 = on */

 struct p9100_regs {
 	/* Registers for the system control */
 	u32 sys_base;
 	u32 sys_config;
 	u32 sys_intr;
 	u32 sys_int_ena;
 	u32 sys_alt_rd;
 	u32 sys_alt_wr;
 	u32 sys_xxx[58];

 	/* Registers for the video control */
 	u32 vid_base;
 	u32 vid_hcnt;
 	u32 vid_htotal;
 	u32 vid_hsync_rise;
 	u32 vid_hblank_rise;
 	u32 vid_hblank_fall;
 	u32 vid_hcnt_preload;
 	u32 vid_vcnt;
 	u32 vid_vlen;
 	u32 vid_vsync_rise;
 	u32 vid_vblank_rise;
 	u32 vid_vblank_fall;
 	u32 vid_vcnt_preload;
 	u32 vid_screenpaint_addr;
 	u32 vid_screenpaint_timectl1;
 	u32 vid_screenpaint_qsfcnt;
 	u32 vid_screenpaint_timectl2;
 	u32 vid_xxx[15];

 	/* Registers for the video control */
 	u32 vram_base;
 	u32 vram_memcfg;
 	u32 vram_refresh_pd;
 	u32 vram_refresh_cnt;
 	u32 vram_raslo_max;
 	u32 vram_raslo_cur;
 	u32 pwrup_cfg;
 	u32 vram_xxx[25];

 	/* Registers for IBM RGB528 Palette */
 	u32 ramdac_cmap_wridx;
 	u32 ramdac_palette_data;
 	u32 ramdac_pixel_mask;
 	u32 ramdac_palette_rdaddr;
 	u32 ramdac_idx_lo;
 	u32 ramdac_idx_hi;
 	u32 ramdac_idx_data;
 	u32 ramdac_idx_ctl;
 	u32 ramdac_xxx[1784];
 };

 struct p9100_cmd_parameng {
 	u32 parameng_status;
 	u32 parameng_bltcmd;
 	u32 parameng_quadcmd;
 };

 struct p9100_par {
 	spinlock_t		lock;
 	struct p9100_regs	__iomem *regs;

 	u32			flags;
 #define P9100_FLAG_BLANKED	0x00000001

 	unsigned long		which_io;
 };

 /**
  *      p9100_setcolreg - Optional function. Sets a color register.
  *      @regno: boolean, 0 copy local, 1 get_user() function
  *      @red: frame buffer colormap structure
  *      @green: The green value which can be up to 16 bits wide
  *      @blue:  The blue value which can be up to 16 bits wide.
  *      @transp: If supported the alpha value which can be up to 16 bits wide.
  *      @info: frame buffer info structure
  */
 static int p9100_setcolreg(unsigned regno,
 			   unsigned red, unsigned green, unsigned blue,
 			   unsigned transp, struct fb_info *info)
 {
 	struct p9100_par *par = (struct p9100_par *) info->par;
 	struct p9100_regs __iomem *regs = par->regs;
 	unsigned long flags;

 	if (regno >= 256)
 		return 1;

 	red >>= 8;
 	green >>= 8;
 	blue >>= 8;

 	spin_lock_irqsave(&par->lock, flags);

 	sbus_writel((regno << 16), &regs->ramdac_cmap_wridx);
 	sbus_writel((red << 16), &regs->ramdac_palette_data);
 	sbus_writel((green << 16), &regs->ramdac_palette_data);
 	sbus_writel((blue << 16), &regs->ramdac_palette_data);

 	spin_unlock_irqrestore(&par->lock, flags);

 	return 0;
 }

 /**
  *      p9100_blank - Optional function.  Blanks the display.
  *      @blank: the blank mode we want.
  *      @info: frame buffer structure that represents a single frame buffer
  */
 static int
 p9100_blank(int blank, struct fb_info *info)
 {
 	struct p9100_par *par = (struct p9100_par *) info->par;
 	struct p9100_regs __iomem *regs = par->regs;
 	unsigned long flags;
 	u32 val;

 	spin_lock_irqsave(&par->lock, flags);

 	switch (blank) {
 	case FB_BLANK_UNBLANK: /* Unblanking */
 		val = sbus_readl(&regs->vid_screenpaint_timectl1);
 		val |= SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
 		sbus_writel(val, &regs->vid_screenpaint_timectl1);
 		par->flags &= ~P9100_FLAG_BLANKED;
 		break;

 	case FB_BLANK_NORMAL: /* Normal blanking */
 	case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
 	case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
 	case FB_BLANK_POWERDOWN: /* Poweroff */
 		val = sbus_readl(&regs->vid_screenpaint_timectl1);
 		val &= ~SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
 		sbus_writel(val, &regs->vid_screenpaint_timectl1);
 		par->flags |= P9100_FLAG_BLANKED;
 		break;
 	}

 	spin_unlock_irqrestore(&par->lock, flags);

 	return 0;
 }

 static const struct sbus_mmap_map p9100_mmap_map[] = {
 	{ CG3_MMAP_OFFSET,	0,		SBUS_MMAP_FBSIZE(1) },
 	{ 0,			0,		0		    }
 };

 static int p9100_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 {
 	struct p9100_par *par = (struct p9100_par *)info->par;

 	return sbusfb_mmap_helper(p9100_mmap_map,
 				  info->fix.smem_start, info->fix.smem_len,
 				  par->which_io, vma);
 }

 static int p9100_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
 {
 	/* Make it look like a cg3. */
 	return sbusfb_ioctl_helper(cmd, arg, info,
 				   FBTYPE_SUN3COLOR, 8, info->fix.smem_len);
 }

 /*
  *  Initialisation
  */

 static void p9100_init_fix(struct fb_info *info, int linebytes, struct device_node *dp)
 {
 	snprintf(info->fix.id, sizeof(info->fix.id), "%pOFn", dp);

 	info->fix.type = FB_TYPE_PACKED_PIXELS;
 	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;

 	info->fix.line_length = linebytes;

 	info->fix.accel = FB_ACCEL_SUN_CGTHREE;
 }

 static int p9100_probe(struct platform_device *op)
 {
 	struct device_node *dp = op->dev.of_node;
 	struct fb_info *info;
 	struct p9100_par *par;
 	int linebytes, err;

 	info = framebuffer_alloc(sizeof(struct p9100_par), &op->dev);

 	err = -ENOMEM;
 	if (!info)
 		goto out_err;
 	par = info->par;

 	spin_lock_init(&par->lock);

 	/* This is the framebuffer and the only resource apps can mmap.  */
 	info->fix.smem_start = op->resource[2].start;
 	par->which_io = op->resource[2].flags & IORESOURCE_BITS;

 	sbusfb_fill_var(&info->var, dp, 8);
 	info->var.red.length = 8;
 	info->var.green.length = 8;
 	info->var.blue.length = 8;

 	linebytes = of_getintprop_default(dp, "linebytes", info->var.xres);
 	info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);

 	par->regs = of_ioremap(&op->resource[0], 0,
 			       sizeof(struct p9100_regs), "p9100 regs");
 	if (!par->regs)
 		goto out_release_fb;

 	info->fbops = &p9100_ops;
 	info->screen_base = of_ioremap(&op->resource[2], 0,
 				       info->fix.smem_len, "p9100 ram");
 	if (!info->screen_base)
 		goto out_unmap_regs;

 	p9100_blank(FB_BLANK_UNBLANK, info);

 	if (fb_alloc_cmap(&info->cmap, 256, 0))
 		goto out_unmap_screen;

 	p9100_init_fix(info, linebytes, dp);

 	err = register_framebuffer(info);
 	if (err < 0)
 		goto out_dealloc_cmap;

 	fb_set_cmap(&info->cmap, info);

 	dev_set_drvdata(&op->dev, info);

 	printk(KERN_INFO "%pOF: p9100 at %lx:%lx\n",
 	       dp,
 	       par->which_io, info->fix.smem_start);

 	return 0;

 out_dealloc_cmap:
 	fb_dealloc_cmap(&info->cmap);

 out_unmap_screen:
 	of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len);

 out_unmap_regs:
 	of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));

 out_release_fb:
 	framebuffer_release(info);

 out_err:
 	return err;
 }

 static void p9100_remove(struct platform_device *op)
 {
 	struct fb_info *info = dev_get_drvdata(&op->dev);
 	struct p9100_par *par = info->par;

 	unregister_framebuffer(info);
 	fb_dealloc_cmap(&info->cmap);

 	of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));
 	of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len);

 	framebuffer_release(info);
 }

 static const struct of_device_id p9100_match[] = {
 	{
 		.name = "p9100",
 	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, p9100_match);

 static struct platform_driver p9100_driver = {
 	.driver = {
 		.name = "p9100",
 		.of_match_table = p9100_match,
 	},
 	.probe		= p9100_probe,
 	.remove		= p9100_remove,
 };

 static int __init p9100_init(void)
 {
 	if (fb_get_options("p9100fb", NULL))
 		return -ENODEV;

 	return platform_driver_register(&p9100_driver);
 }

 static void __exit p9100_exit(void)
 {
 	platform_driver_unregister(&p9100_driver);
 }

 module_init(p9100_init);
 module_exit(p9100_exit);

 MODULE_DESCRIPTION("framebuffer driver for P9100 chipsets");
 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
 MODULE_VERSION("2.0");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-only
	/* p9100.c: P9100 frame buffer driver
	*
	* Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
	* Copyright 1999 Derrick J Brashear (shadow@dementia.org)
	*
	* Driver layout based loosely on tgafb.c, see that file for credits.
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/string.h>
	#include <linux/delay.h>
	#include <linux/init.h>
	#include <linux/fb.h>
	#include <linux/mm.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>

	#include <asm/io.h>
	#include <asm/fbio.h>

	#include "sbuslib.h"

	/*
	* Local functions.
	*/

	static int p9100_setcolreg(unsigned, unsigned, unsigned, unsigned,
	unsigned, struct fb_info *);
	static int p9100_blank(int, struct fb_info *);

	static int p9100_sbusfb_mmap(struct fb_info info, struct vm_area_struct vma);
	static int p9100_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg);

	/*
	* Frame buffer operations
	*/

	static const struct fb_ops p9100_ops = {
	.owner = THIS_MODULE,
	FB_DEFAULT_SBUS_OPS(p9100),
	.fb_setcolreg = p9100_setcolreg,
	.fb_blank = p9100_blank,
	};

	/* P9100 control registers */
	#define P9100_SYSCTL_OFF 0x0UL
	#define P9100_VIDEOCTL_OFF 0x100UL
	#define P9100_VRAMCTL_OFF 0x180UL
	#define P9100_RAMDAC_OFF 0x200UL
	#define P9100_VIDEOCOPROC_OFF 0x400UL

	/* P9100 command registers */
	#define P9100_CMD_OFF 0x0UL

	/* P9100 framebuffer memory */
	#define P9100_FB_OFF 0x0UL

	/* 3 bits: 2=8bpp 3=16bpp 5=32bpp 7=24bpp */
	#define SYS_CONFIG_PIXELSIZE_SHIFT 26

	#define SCREENPAINT_TIMECTL1_ENABLE_VIDEO 0x20 /* 0 = off, 1 = on */

	struct p9100_regs {
	/* Registers for the system control */
	u32 sys_base;
	u32 sys_config;
	u32 sys_intr;
	u32 sys_int_ena;
	u32 sys_alt_rd;
	u32 sys_alt_wr;
	u32 sys_xxx[58];

	/* Registers for the video control */
	u32 vid_base;
	u32 vid_hcnt;
	u32 vid_htotal;
	u32 vid_hsync_rise;
	u32 vid_hblank_rise;
	u32 vid_hblank_fall;
	u32 vid_hcnt_preload;
	u32 vid_vcnt;
	u32 vid_vlen;
	u32 vid_vsync_rise;
	u32 vid_vblank_rise;
	u32 vid_vblank_fall;
	u32 vid_vcnt_preload;
	u32 vid_screenpaint_addr;
	u32 vid_screenpaint_timectl1;
	u32 vid_screenpaint_qsfcnt;
	u32 vid_screenpaint_timectl2;
	u32 vid_xxx[15];

	/* Registers for the video control */
	u32 vram_base;
	u32 vram_memcfg;
	u32 vram_refresh_pd;
	u32 vram_refresh_cnt;
	u32 vram_raslo_max;
	u32 vram_raslo_cur;
	u32 pwrup_cfg;
	u32 vram_xxx[25];

	/* Registers for IBM RGB528 Palette */
	u32 ramdac_cmap_wridx;
	u32 ramdac_palette_data;
	u32 ramdac_pixel_mask;
	u32 ramdac_palette_rdaddr;
	u32 ramdac_idx_lo;
	u32 ramdac_idx_hi;
	u32 ramdac_idx_data;
	u32 ramdac_idx_ctl;
	u32 ramdac_xxx[1784];
	};

	struct p9100_cmd_parameng {
	u32 parameng_status;
	u32 parameng_bltcmd;
	u32 parameng_quadcmd;
	};

	struct p9100_par {
	spinlock_t lock;
	struct p9100_regs __iomem *regs;

	u32 flags;
	#define P9100_FLAG_BLANKED 0x00000001

	unsigned long which_io;
	};

	/**
	* p9100_setcolreg - Optional function. Sets a color register.
	* @regno: boolean, 0 copy local, 1 get_user() function
	* @red: frame buffer colormap structure
	* @green: The green value which can be up to 16 bits wide
	* @blue: The blue value which can be up to 16 bits wide.
	* @transp: If supported the alpha value which can be up to 16 bits wide.
	* @info: frame buffer info structure
	*/
	static int p9100_setcolreg(unsigned regno,
	unsigned red, unsigned green, unsigned blue,
	unsigned transp, struct fb_info *info)
	{
	struct p9100_par par = (struct p9100_par ) info->par;
	struct p9100_regs __iomem *regs = par->regs;
	unsigned long flags;

	if (regno >= 256)
	return 1;

	red >>= 8;
	green >>= 8;
	blue >>= 8;

	spin_lock_irqsave(&par->lock, flags);

	sbus_writel((regno << 16), &regs->ramdac_cmap_wridx);
	sbus_writel((red << 16), &regs->ramdac_palette_data);
	sbus_writel((green << 16), &regs->ramdac_palette_data);
	sbus_writel((blue << 16), &regs->ramdac_palette_data);

	spin_unlock_irqrestore(&par->lock, flags);

	return 0;
	}

	/**
	* p9100_blank - Optional function. Blanks the display.
	* @blank: the blank mode we want.
	* @info: frame buffer structure that represents a single frame buffer
	*/
	static int
	p9100_blank(int blank, struct fb_info *info)
	{
	struct p9100_par par = (struct p9100_par ) info->par;
	struct p9100_regs __iomem *regs = par->regs;
	unsigned long flags;
	u32 val;

	spin_lock_irqsave(&par->lock, flags);

	switch (blank) {
	case FB_BLANK_UNBLANK: /* Unblanking */
	val = sbus_readl(&regs->vid_screenpaint_timectl1);
	val \|= SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
	sbus_writel(val, &regs->vid_screenpaint_timectl1);
	par->flags &= ~P9100_FLAG_BLANKED;
	break;

	case FB_BLANK_NORMAL: /* Normal blanking */
	case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
	case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
	case FB_BLANK_POWERDOWN: /* Poweroff */
	val = sbus_readl(&regs->vid_screenpaint_timectl1);
	val &= ~SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
	sbus_writel(val, &regs->vid_screenpaint_timectl1);
	par->flags \|= P9100_FLAG_BLANKED;
	break;
	}

	spin_unlock_irqrestore(&par->lock, flags);

	return 0;
	}

	static const struct sbus_mmap_map p9100_mmap_map[] = {
	{ CG3_MMAP_OFFSET, 0, SBUS_MMAP_FBSIZE(1) },
	{ 0, 0, 0 }
	};

	static int p9100_sbusfb_mmap(struct fb_info info, struct vm_area_struct vma)
	{
	struct p9100_par par = (struct p9100_par )info->par;

	return sbusfb_mmap_helper(p9100_mmap_map,
	info->fix.smem_start, info->fix.smem_len,
	par->which_io, vma);
	}

	static int p9100_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
	{
	/* Make it look like a cg3. */
	return sbusfb_ioctl_helper(cmd, arg, info,
	FBTYPE_SUN3COLOR, 8, info->fix.smem_len);
	}

	/*
	* Initialisation
	*/

	static void p9100_init_fix(struct fb_info info, int linebytes, struct device_node dp)
	{
	snprintf(info->fix.id, sizeof(info->fix.id), "%pOFn", dp);

	info->fix.type = FB_TYPE_PACKED_PIXELS;
	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;

	info->fix.line_length = linebytes;

	info->fix.accel = FB_ACCEL_SUN_CGTHREE;
	}

	static int p9100_probe(struct platform_device *op)
	{
	struct device_node *dp = op->dev.of_node;
	struct fb_info *info;
	struct p9100_par *par;
	int linebytes, err;

	info = framebuffer_alloc(sizeof(struct p9100_par), &op->dev);

	err = -ENOMEM;
	if (!info)
	goto out_err;
	par = info->par;

	spin_lock_init(&par->lock);

	/* This is the framebuffer and the only resource apps can mmap. */
	info->fix.smem_start = op->resource[2].start;
	par->which_io = op->resource[2].flags & IORESOURCE_BITS;

	sbusfb_fill_var(&info->var, dp, 8);
	info->var.red.length = 8;
	info->var.green.length = 8;
	info->var.blue.length = 8;

	linebytes = of_getintprop_default(dp, "linebytes", info->var.xres);
	info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);

	par->regs = of_ioremap(&op->resource[0], 0,
	sizeof(struct p9100_regs), "p9100 regs");
	if (!par->regs)
	goto out_release_fb;

	info->fbops = &p9100_ops;
	info->screen_base = of_ioremap(&op->resource[2], 0,
	info->fix.smem_len, "p9100 ram");
	if (!info->screen_base)
	goto out_unmap_regs;

	p9100_blank(FB_BLANK_UNBLANK, info);

	if (fb_alloc_cmap(&info->cmap, 256, 0))
	goto out_unmap_screen;

	p9100_init_fix(info, linebytes, dp);

	err = register_framebuffer(info);
	if (err < 0)
	goto out_dealloc_cmap;

	fb_set_cmap(&info->cmap, info);

	dev_set_drvdata(&op->dev, info);

	printk(KERN_INFO "%pOF: p9100 at %lx:%lx\n",
	dp,
	par->which_io, info->fix.smem_start);

	return 0;

	out_dealloc_cmap:
	fb_dealloc_cmap(&info->cmap);

	out_unmap_screen:
	of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len);

	out_unmap_regs:
	of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));

	out_release_fb:
	framebuffer_release(info);

	out_err:
	return err;
	}

	static void p9100_remove(struct platform_device *op)
	{
	struct fb_info *info = dev_get_drvdata(&op->dev);
	struct p9100_par *par = info->par;

	unregister_framebuffer(info);
	fb_dealloc_cmap(&info->cmap);

	of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));
	of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len);

	framebuffer_release(info);
	}

	static const struct of_device_id p9100_match[] = {
	{
	.name = "p9100",
	},
	{},
	};
	MODULE_DEVICE_TABLE(of, p9100_match);

	static struct platform_driver p9100_driver = {
	.driver = {
	.name = "p9100",
	.of_match_table = p9100_match,
	},
	.probe = p9100_probe,
	.remove = p9100_remove,
	};

	static int __init p9100_init(void)
	{
	if (fb_get_options("p9100fb", NULL))
	return -ENODEV;

	return platform_driver_register(&p9100_driver);
	}

	static void __exit p9100_exit(void)
	{
	platform_driver_unregister(&p9100_driver);
	}

	module_init(p9100_init);
	module_exit(p9100_exit);

	MODULE_DESCRIPTION("framebuffer driver for P9100 chipsets");
	MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
	MODULE_VERSION("2.0");
	MODULE_LICENSE("GPL");