include/linux/devpts_fs.h


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/* -*- linux-c -*- --------------------------------------------------------- *
 *
 * linux/include/linux/devpts_fs.h
 *
 *  Copyright 1998-2004 H. Peter Anvin -- All Rights Reserved
 *
 * This file is part of the Linux kernel and is made available under
 * the terms of the GNU General Public License, version 2, or at your
 * option, any later version, incorporated herein by reference.
 *
 * ------------------------------------------------------------------------- */

#ifndef _LINUX_DEVPTS_FS_H
#define _LINUX_DEVPTS_FS_H

#include <linux/errno.h>

#ifdef CONFIG_UNIX98_PTYS

int devpts_new_index(struct inode *ptmx_inode);
void devpts_kill_index(struct inode *ptmx_inode, int idx);
/* mknod in devpts */
struct inode *devpts_pty_new(struct inode *ptmx_inode, dev_t device, int index,
		void *priv);
/* get private structure */
void *devpts_get_priv(struct inode *pts_inode);
/* unlink */
void devpts_pty_kill(struct inode *inode);

#else

/* Dummy stubs in the no-pty case */
static inline int devpts_new_index(struct inode *ptmx_inode) { return -EINVAL; }
static inline void devpts_kill_index(struct inode *ptmx_inode, int idx) { }
static inline struct inode *devpts_pty_new(struct inode *ptmx_inode,
		dev_t device, int index, void *priv)
{
	return ERR_PTR(-EINVAL);
}
static inline void *devpts_get_priv(struct inode *pts_inode)
{
	return NULL;
}
static inline void devpts_pty_kill(struct inode *inode) { }

#endif


#endif /* _LINUX_DEVPTS_FS_H */
/*
 * SuperH Mobile LCDC Framebuffer
 *
 * Copyright (c) 2008 Magnus Damm
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/clk.h>
#include <linux/pm_runtime.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/vmalloc.h>
#include <linux/ioctl.h>
#include <linux/slab.h>
#include <linux/console.h>
#include <linux/backlight.h>
#include <linux/gpio.h>
#include <video/sh_mobile_lcdc.h>
#include <linux/atomic.h>

#include "sh_mobile_lcdcfb.h"
#include "sh_mobile_meram.h"

#define SIDE_B_OFFSET 0x1000
#define MIRROR_OFFSET 0x2000

/* shared registers */
#define _LDDCKR 0x410
#define _LDDCKSTPR 0x414
#define _LDINTR 0x468
#define _LDSR 0x46c
#define _LDCNT1R 0x470
#define _LDCNT2R 0x474
#define _LDRCNTR 0x478
#define _LDDDSR 0x47c
#define _LDDWD0R 0x800
#define _LDDRDR 0x840
#define _LDDWAR 0x900
#define _LDDRAR 0x904

/* shared registers and their order for context save/restore */
static int lcdc_shared_regs[] = {
	_LDDCKR,
	_LDDCKSTPR,
	_LDINTR,
	_LDDDSR,
	_LDCNT1R,
	_LDCNT2R,
};
#define NR_SHARED_REGS ARRAY_SIZE(lcdc_shared_regs)

#define MAX_XRES 1920
#define MAX_YRES 1080

static unsigned long lcdc_offs_mainlcd[NR_CH_REGS] = {
	[LDDCKPAT1R] = 0x400,
	[LDDCKPAT2R] = 0x404,
	[LDMT1R] = 0x418,
	[LDMT2R] = 0x41c,
	[LDMT3R] = 0x420,
	[LDDFR] = 0x424,
	[LDSM1R] = 0x428,
	[LDSM2R] = 0x42c,
	[LDSA1R] = 0x430,
	[LDSA2R] = 0x434,
	[LDMLSR] = 0x438,
	[LDHCNR] = 0x448,
	[LDHSYNR] = 0x44c,
	[LDVLNR] = 0x450,
	[LDVSYNR] = 0x454,
	[LDPMR] = 0x460,
	[LDHAJR] = 0x4a0,
};

static unsigned long lcdc_offs_sublcd[NR_CH_REGS] = {
	[LDDCKPAT1R] = 0x408,
	[LDDCKPAT2R] = 0x40c,
	[LDMT1R] = 0x600,
	[LDMT2R] = 0x604,
	[LDMT3R] = 0x608,
	[LDDFR] = 0x60c,
	[LDSM1R] = 0x610,
	[LDSM2R] = 0x614,
	[LDSA1R] = 0x618,
	[LDMLSR] = 0x620,
	[LDHCNR] = 0x624,
	[LDHSYNR] = 0x628,
	[LDVLNR] = 0x62c,
	[LDVSYNR] = 0x630,
	[LDPMR] = 0x63c,
};

#define START_LCDC	0x00000001
#define LCDC_RESET	0x00000100
#define DISPLAY_BEU	0x00000008
#define LCDC_ENABLE	0x00000001
#define LDINTR_FE	0x00000400
#define LDINTR_VSE	0x00000200
#define LDINTR_VEE	0x00000100
#define LDINTR_FS	0x00000004
#define LDINTR_VSS	0x00000002
#define LDINTR_VES	0x00000001
#define LDRCNTR_SRS	0x00020000
#define LDRCNTR_SRC	0x00010000
#define LDRCNTR_MRS	0x00000002
#define LDRCNTR_MRC	0x00000001
#define LDSR_MRS	0x00000100

static const struct fb_videomode default_720p = {
	.name = "HDMI 720p",
	.xres = 1280,
	.yres = 720,

	.left_margin = 220,
	.right_margin = 110,
	.hsync_len = 40,

	.upper_margin = 20,
	.lower_margin = 5,
	.vsync_len = 5,

	.pixclock = 13468,
	.refresh = 60,
	.sync = FB_SYNC_VERT_HIGH_ACT | FB_SYNC_HOR_HIGH_ACT,
};

struct sh_mobile_lcdc_priv {
	void __iomem *base;
	int irq;
	atomic_t hw_usecnt;
	struct device *dev;
	struct clk *dot_clk;
	unsigned long lddckr;
	struct sh_mobile_lcdc_chan ch[2];
	struct notifier_block notifier;
	unsigned long saved_shared_regs[NR_SHARED_REGS];
	int started;
	int forced_bpp; /* 2 channel LCDC must share bpp setting */
	struct sh_mobile_meram_info *meram_dev;
};

static bool banked(int reg_nr)
{
	switch (reg_nr) {
	case LDMT1R:
	case LDMT2R:
	case LDMT3R:
	case LDDFR:
	case LDSM1R:
	case LDSA1R:
	case LDSA2R:
	case LDMLSR:
	case LDHCNR:
	case LDHSYNR:
	case LDVLNR:
	case LDVSYNR:
		return true;
	}
	return false;
}

static void lcdc_write_chan(struct sh_mobile_lcdc_chan *chan,
			    int reg_nr, unsigned long data)
{
	iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr]);
	if (banked(reg_nr))
		iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
			  SIDE_B_OFFSET);
}

static void lcdc_write_chan_mirror(struct sh_mobile_lcdc_chan *chan,
			    int reg_nr, unsigned long data)
{
	iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
		  MIRROR_OFFSET);
}

static unsigned long lcdc_read_chan(struct sh_mobile_lcdc_chan *chan,
				    int reg_nr)
{
	return ioread32(chan->lcdc->base + chan->reg_offs[reg_nr]);
}

static void lcdc_write(struct sh_mobile_lcdc_priv *priv,
		       unsigned long reg_offs, unsigned long data)
{
	iowrite32(data, priv->base + reg_offs);
}

static unsigned long lcdc_read(struct sh_mobile_lcdc_priv *priv,
			       unsigned long reg_offs)
{
	return ioread32(priv->base + reg_offs);
}

static void lcdc_wait_bit(struct sh_mobile_lcdc_priv *priv,
			  unsigned long reg_offs,
			  unsigned long mask, unsigned long until)
{
	while ((lcdc_read(priv, reg_offs) & mask) != until)
		cpu_relax();
}

static int lcdc_chan_is_sublcd(struct sh_mobile_lcdc_chan *chan)
{
	return chan->cfg.chan == LCDC_CHAN_SUBLCD;
}

static void lcdc_sys_write_index(void *handle, unsigned long data)
{
	struct sh_mobile_lcdc_chan *ch = handle;

	lcdc_write(ch->lcdc, _LDDWD0R, data | 0x10000000);
	lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
	lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
	lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
}

static void lcdc_sys_write_data(void *handle, unsigned long data)
{
	struct sh_mobile_lcdc_chan *ch = handle;

	lcdc_write(ch->lcdc, _LDDWD0R, data | 0x11000000);
	lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
	lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
	lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
}

static unsigned long lcdc_sys_read_data(void *handle)
{
	struct sh_mobile_lcdc_chan *ch = handle;

	lcdc_write(ch->lcdc, _LDDRDR, 0x01000000);
	lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
	lcdc_write(ch->lcdc, _LDDRAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
	udelay(1);
	lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);

	return lcdc_read(ch->lcdc, _LDDRDR) & 0x3ffff;
}

struct sh_mobile_lcdc_sys_bus_ops sh_mobile_lcdc_sys_bus_ops = {
	lcdc_sys_write_index,
	lcdc_sys_write_data,
	lcdc_sys_read_data,
};

static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv)
{
	if (atomic_inc_and_test(&priv->hw_usecnt)) {
		pm_runtime_get_sync(priv->dev);
		if (priv->dot_clk)
			clk_enable(priv->dot_clk);
	}
}

static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv)
{
	if (atomic_sub_return(1, &priv->hw_usecnt) == -1) {
		if (priv->dot_clk)
			clk_disable(priv->dot_clk);
		pm_runtime_put(priv->dev);
	}
}

static int sh_mobile_lcdc_sginit(struct fb_info *info,
				  struct list_head *pagelist)
{
	struct sh_mobile_lcdc_chan *ch = info->par;
	unsigned int nr_pages_max = info->fix.smem_len >> PAGE_SHIFT;
	struct page *page;
	int nr_pages = 0;

	sg_init_table(ch->sglist, nr_pages_max);

	list_for_each_entry(page, pagelist, lru)
		sg_set_page(&ch->sglist[nr_pages++], page, PAGE_SIZE, 0);

	return nr_pages;
}

static void sh_mobile_lcdc_deferred_io(struct fb_info *info,
				       struct list_head *pagelist)
{
	struct sh_mobile_lcdc_chan *ch = info->par;
	struct sh_mobile_lcdc_board_cfg	*bcfg = &ch->cfg.board_cfg;

	/* enable clocks before accessing hardware */
	sh_mobile_lcdc_clk_on(ch->lcdc);

	/*
	 * It's possible to get here without anything on the pagelist via
	 * sh_mobile_lcdc_deferred_io_touch() or via a userspace fsync()
	 * invocation. In the former case, the acceleration routines are
	 * stepped in to when using the framebuffer console causing the
	 * workqueue to be scheduled without any dirty pages on the list.
	 *
	 * Despite this, a panel update is still needed given that the
	 * acceleration routines have their own methods for writing in
	 * that still need to be updated.
	 *
	 * The fsync() and empty pagelist case could be optimized for,
	 * but we don't bother, as any application exhibiting such
	 * behaviour is fundamentally broken anyways.
	 */
	if (!list_empty(pagelist)) {
		unsigned int nr_pages = sh_mobile_lcdc_sginit(info, pagelist);

		/* trigger panel update */
		dma_map_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
		if (bcfg->start_transfer)
			bcfg->start_transfer(bcfg->board_data, ch,
					     &sh_mobile_lcdc_sys_bus_ops);
		lcdc_write_chan(ch, LDSM2R, 1);
		dma_unmap_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
	} else {
		if (bcfg->start_transfer)
			bcfg->start_transfer(bcfg->board_data, ch,
					     &sh_mobile_lcdc_sys_bus_ops);
		lcdc_write_chan(ch, LDSM2R, 1);
	}
}

static void sh_mobile_lcdc_deferred_io_touch(struct fb_info *info)
{
	struct fb_deferred_io *fbdefio = info->fbdefio;

	if (fbdefio)
		schedule_delayed_work(&info->deferred_work, fbdefio->delay);
}

static irqreturn_t sh_mobile_lcdc_irq(int irq, void *data)
{
	struct sh_mobile_lcdc_priv *priv = data;
	struct sh_mobile_lcdc_chan *ch;
	unsigned long tmp;
	unsigned long ldintr;
	int is_sub;
	int k;

	/* acknowledge interrupt */
	ldintr = tmp = lcdc_read(priv, _LDINTR);
	/*
	 * disable further VSYNC End IRQs, preserve all other enabled IRQs,
	 * write 0 to bits 0-6 to ack all triggered IRQs.
	 */
	tmp &= 0xffffff00 & ~LDINTR_VEE;
	lcdc_write(priv, _LDINTR, tmp);

	/* figure out if this interrupt is for main or sub lcd */
	is_sub = (lcdc_read(priv, _LDSR) & (1 << 10)) ? 1 : 0;

	/* wake up channel and disable clocks */
	for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
		ch = &priv->ch[k];

		if (!ch->enabled)
			continue;

		/* Frame Start */
		if (ldintr & LDINTR_FS) {
			if (is_sub == lcdc_chan_is_sublcd(ch)) {
				ch->frame_end = 1;
				wake_up(&ch->frame_end_wait);

				sh_mobile_lcdc_clk_off(priv);
			}
		}

		/* VSYNC End */
		if (ldintr & LDINTR_VES)
			complete(&ch->vsync_completion);
	}

	return IRQ_HANDLED;
}

static void sh_mobile_lcdc_start_stop(struct sh_mobile_lcdc_priv *priv,
				      int start)
{
	unsigned long tmp = lcdc_read(priv, _LDCNT2R);
	int k;

	/* start or stop the lcdc */
	if (start)
		lcdc_write(priv, _LDCNT2R, tmp | START_LCDC);
	else
		lcdc_write(priv, _LDCNT2R, tmp & ~START_LCDC);

	/* wait until power is applied/stopped on all channels */
	for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
		if (lcdc_read(priv, _LDCNT2R) & priv->ch[k].enabled)
			while (1) {
				tmp = lcdc_read_chan(&priv->ch[k], LDPMR) & 3;
				if (start && tmp == 3)
					break;
				if (!start && tmp == 0)
					break;
				cpu_relax();
			}

	if (!start)
		lcdc_write(priv, _LDDCKSTPR, 1); /* stop dotclock */
}

static void sh_mobile_lcdc_geometry(struct sh_mobile_lcdc_chan *ch)
{
	struct fb_var_screeninfo *var = &ch->info->var, *display_var = &ch->display_var;
	unsigned long h_total, hsync_pos, display_h_total;
	u32 tmp;

	tmp = ch->ldmt1r_value;
	tmp |= (var->sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : 1 << 28;
	tmp |= (var->sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : 1 << 27;
	tmp |= (ch->cfg.flags & LCDC_FLAGS_DWPOL) ? 1 << 26 : 0;
	tmp |= (ch->cfg.flags & LCDC_FLAGS_DIPOL) ? 1 << 25 : 0;
	tmp |= (ch->cfg.flags & LCDC_FLAGS_DAPOL) ? 1 << 24 : 0;
	tmp |= (ch->cfg.flags & LCDC_FLAGS_HSCNT) ? 1 << 17 : 0;
	tmp |= (ch->cfg.flags & LCDC_FLAGS_DWCNT) ? 1 << 16 : 0;
	lcdc_write_chan(ch, LDMT1R, tmp);

	/* setup SYS bus */
	lcdc_write_chan(ch, LDMT2R, ch->cfg.sys_bus_cfg.ldmt2r);
	lcdc_write_chan(ch, LDMT3R, ch->cfg.sys_bus_cfg.ldmt3r);

	/* horizontal configuration */
	h_total = display_var->xres + display_var->hsync_len +
		display_var->left_margin + display_var->right_margin;
	tmp = h_total / 8; /* HTCN */
	tmp |= (min(display_var->xres, var->xres) / 8) << 16; /* HDCN */
	lcdc_write_chan(ch, LDHCNR, tmp);

	hsync_pos = display_var->xres + display_var->right_margin;
	tmp = hsync_pos / 8; /* HSYNP */
	tmp |= (display_var->hsync_len / 8) << 16; /* HSYNW */
	lcdc_write_chan(ch, LDHSYNR, tmp);

	/* vertical configuration */
	tmp = display_var->yres + display_var->vsync_len +
		display_var->upper_margin + display_var->lower_margin; /* VTLN */