[ARM] 5353/1: fbdev: add E-Ink Broadsheet controller support v3

This patch adds support for the E-Ink Broadsheet display controller.

Cc: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 568 insertions, 0 deletions

diff --git a/drivers/video/broadsheetfb.c b/drivers/video/broadsheetfb.c
new file mode 100644
index 000000000000..509cb92e8731
--- /dev/null
+++ b/drivers/video/broadsheetfb.c
@@ -0,0 +1,568 @@
+/*
+ * broadsheetfb.c -- FB driver for E-Ink Broadsheet controller
+ *
+ * Copyright (C) 2008, Jaya Kumar
+ *
+ * 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.
+ *
+ * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
+ *
+ * This driver is written to be used with the Broadsheet display controller.
+ *
+ * It is intended to be architecture independent. A board specific driver
+ * must be used to perform all the physical IO interactions.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/list.h>
+#include <linux/uaccess.h>
+
+#include <video/broadsheetfb.h>
+
+/* Display specific information */
+#define DPY_W 800
+#define DPY_H 600
+
+static struct fb_fix_screeninfo broadsheetfb_fix __devinitdata = {
+        .id =           "broadsheetfb",
+        .type =         FB_TYPE_PACKED_PIXELS,
+        .visual =       FB_VISUAL_STATIC_PSEUDOCOLOR,
+        .xpanstep =     0,
+        .ypanstep =     0,
+        .ywrapstep =    0,
+        .line_length =  DPY_W,
+        .accel =        FB_ACCEL_NONE,
+};
+
+static struct fb_var_screeninfo broadsheetfb_var __devinitdata = {
+        .xres           = DPY_W,
+        .yres           = DPY_H,
+        .xres_virtual   = DPY_W,
+        .yres_virtual   = DPY_H,
+        .bits_per_pixel = 8,
+        .grayscale      = 1,
+        .red =          { 0, 4, 0 },
+        .green =        { 0, 4, 0 },
+        .blue =         { 0, 4, 0 },
+        .transp =       { 0, 0, 0 },
+};
+
+/* main broadsheetfb functions */
+static void broadsheet_issue_data(struct broadsheetfb_par *par, u16 data)
+{
+        par->board->set_ctl(par, BS_WR, 0);
+        par->board->set_hdb(par, data);
+        par->board->set_ctl(par, BS_WR, 1);
+}
+
+static void broadsheet_issue_cmd(struct broadsheetfb_par *par, u16 data)
+{
+        par->board->set_ctl(par, BS_DC, 0);
+        broadsheet_issue_data(par, data);
+}
+
+static void broadsheet_send_command(struct broadsheetfb_par *par, u16 data)
+{
+        par->board->wait_for_rdy(par);
+
+        par->board->set_ctl(par, BS_CS, 0);
+        broadsheet_issue_cmd(par, data);
+        par->board->set_ctl(par, BS_DC, 1);
+        par->board->set_ctl(par, BS_CS, 1);
+}
+
+static void broadsheet_send_cmdargs(struct broadsheetfb_par *par, u16 cmd,
+                                        int argc, u16 *argv)
+{
+        int i;
+
+        par->board->wait_for_rdy(par);
+
+        par->board->set_ctl(par, BS_CS, 0);
+        broadsheet_issue_cmd(par, cmd);
+        par->board->set_ctl(par, BS_DC, 1);
+
+        for (i = 0; i < argc; i++)
+                broadsheet_issue_data(par, argv[i]);
+        par->board->set_ctl(par, BS_CS, 1);
+}
+
+static void broadsheet_burst_write(struct broadsheetfb_par *par, int size,
+                                        u16 *data)
+{
+        int i;
+        u16 tmp;
+
+        par->board->set_ctl(par, BS_CS, 0);
+        par->board->set_ctl(par, BS_DC, 1);
+
+        for (i = 0; i < size; i++) {
+                par->board->set_ctl(par, BS_WR, 0);
+                tmp = (data[i] & 0x0F) << 4;
+                tmp |= (data[i] & 0x0F00) << 4;
+                par->board->set_hdb(par, tmp);
+                par->board->set_ctl(par, BS_WR, 1);
+        }
+
+        par->board->set_ctl(par, BS_CS, 1);
+}
+
+static u16 broadsheet_get_data(struct broadsheetfb_par *par)
+{
+        u16 res;
+        /* wait for ready to go hi. (lo is busy) */
+        par->board->wait_for_rdy(par);
+
+        /* cs lo, dc lo for cmd, we lo for each data, db as usual */
+        par->board->set_ctl(par, BS_DC, 1);
+        par->board->set_ctl(par, BS_CS, 0);
+        par->board->set_ctl(par, BS_WR, 0);
+
+        res = par->board->get_hdb(par);
+
+        /* strobe wr */
+        par->board->set_ctl(par, BS_WR, 1);
+        par->board->set_ctl(par, BS_CS, 1);
+
+        return res;
+}
+
+static void broadsheet_write_reg(struct broadsheetfb_par *par, u16 reg,
+                                        u16 data)
+{
+        /* wait for ready to go hi. (lo is busy) */
+        par->board->wait_for_rdy(par);
+
+        /* cs lo, dc lo for cmd, we lo for each data, db as usual */
+        par->board->set_ctl(par, BS_CS, 0);
+
+        broadsheet_issue_cmd(par, BS_CMD_WR_REG);
+
+        par->board->set_ctl(par, BS_DC, 1);
+
+        broadsheet_issue_data(par, reg);
+        broadsheet_issue_data(par, data);
+
+        par->board->set_ctl(par, BS_CS, 1);
+}
+
+static u16 broadsheet_read_reg(struct broadsheetfb_par *par, u16 reg)
+{
+        broadsheet_send_command(par, reg);
+        msleep(100);
+        return broadsheet_get_data(par);
+}
+
+static void __devinit broadsheet_init_display(struct broadsheetfb_par *par)
+{
+        u16 args[5];
+
+        args[0] = DPY_W;
+        args[1] = DPY_H;
+        args[2] = (100 | (1 << 8) | (1 << 9)); /* sdcfg */
+        args[3] = 2; /* gdrv cfg */
+        args[4] = (4 | (1 << 7)); /* lut index format */
+        broadsheet_send_cmdargs(par, BS_CMD_INIT_DSPE_CFG, 5, args);
+
+        /* did the controller really set it? */
+        broadsheet_send_cmdargs(par, BS_CMD_INIT_DSPE_CFG, 5, args);
+
+        args[0] = 4; /* fsync len */
+        args[1] = (10 << 8) | 4; /* fend/fbegin len */
+        args[2] = 10; /* line sync len */
+        args[3] = (100 << 8) | 4; /* line end/begin len */
+        args[4] = 6; /* pixel clock cfg */
+        broadsheet_send_cmdargs(par, BS_CMD_INIT_DSPE_TMG, 5, args);
+
+        /* setup waveform */
+        args[0] = 0x886;
+        args[1] = 0;
+        broadsheet_send_cmdargs(par, BS_CMD_RD_WFM_INFO, 2, args);
+
+        broadsheet_send_command(par, BS_CMD_UPD_GDRV_CLR);
+
+        broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG);
+
+        broadsheet_write_reg(par, 0x330, 0x84);
+
+        broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG);
+
+        args[0] = (0x3 << 4);
+        broadsheet_send_cmdargs(par, BS_CMD_LD_IMG, 1, args);
+
+        args[0] = 0x154;
+        broadsheet_send_cmdargs(par, BS_CMD_WR_REG, 1, args);
+
+        broadsheet_burst_write(par, DPY_W*DPY_H/2,
+                                (u16 *) par->info->screen_base);
+
+        broadsheet_send_command(par, BS_CMD_LD_IMG_END);
+
+        args[0] = 0x4300;
+        broadsheet_send_cmdargs(par, BS_CMD_UPD_FULL, 1, args);
+
+        broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG);
+
+        broadsheet_send_command(par, BS_CMD_WAIT_DSPE_FREND);
+
+        par->board->wait_for_rdy(par);
+}
+
+static void __devinit broadsheet_init(struct broadsheetfb_par *par)
+{
+        broadsheet_send_command(par, BS_CMD_INIT_SYS_RUN);
+        /* the controller needs a second */
+        msleep(1000);
+        broadsheet_init_display(par);
+}
+
+static void broadsheetfb_dpy_update_pages(struct broadsheetfb_par *par,
+                                                u16 y1, u16 y2)
+{
+        u16 args[5];
+        unsigned char *buf = (unsigned char *)par->info->screen_base;
+
+        /* y1 must be a multiple of 4 so drop the lower bits */
+        y1 &= 0xFFFC;
+        /* y2 must be a multiple of 4 , but - 1 so up the lower bits */
+        y2 |= 0x0003;
+
+        args[0] = 0x3 << 4;
+        args[1] = 0;
+        args[2] = y1;
+        args[3] = cpu_to_le16(par->info->var.xres);
+        args[4] = y2;
+        broadsheet_send_cmdargs(par, BS_CMD_LD_IMG_AREA, 5, args);
+
+        args[0] = 0x154;
+        broadsheet_send_cmdargs(par, BS_CMD_WR_REG, 1, args);
+
+        buf += y1 * par->info->var.xres;
+        broadsheet_burst_write(par, ((1 + y2 - y1) * par->info->var.xres)/2,
+                                (u16 *) buf);
+
+        broadsheet_send_command(par, BS_CMD_LD_IMG_END);
+
+        args[0] = 0x4300;
+        broadsheet_send_cmdargs(par, BS_CMD_UPD_FULL, 1, args);
+
+        broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG);
+
+        broadsheet_send_command(par, BS_CMD_WAIT_DSPE_FREND);
+
+        par->board->wait_for_rdy(par);
+
+}
+
+static void broadsheetfb_dpy_update(struct broadsheetfb_par *par)
+{
+        u16 args[5];
+
+        args[0] = 0x3 << 4;
+        broadsheet_send_cmdargs(par, BS_CMD_LD_IMG, 1, args);
+
+        args[0] = 0x154;
+        broadsheet_send_cmdargs(par, BS_CMD_WR_REG, 1, args);
+        broadsheet_burst_write(par, DPY_W*DPY_H/2,
+                                (u16 *) par->info->screen_base);
+
+        broadsheet_send_command(par, BS_CMD_LD_IMG_END);
+
+        args[0] = 0x4300;
+        broadsheet_send_cmdargs(par, BS_CMD_UPD_FULL, 1, args);
+
+        broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG);
+
+        broadsheet_send_command(par, BS_CMD_WAIT_DSPE_FREND);
+
+        par->board->wait_for_rdy(par);
+
+}
+
+/* this is called back from the deferred io workqueue */
+static void broadsheetfb_dpy_deferred_io(struct fb_info *info,
+                                struct list_head *pagelist)
+{
+        u16 y1 = 0, h = 0;
+        int prev_index = -1;
+        struct page *cur;
+        struct fb_deferred_io *fbdefio = info->fbdefio;
+        int h_inc;
+        u16 yres = info->var.yres;
+        u16 xres = info->var.xres;
+
+        /* height increment is fixed per page */
+        h_inc = DIV_ROUND_UP(PAGE_SIZE , xres);
+
+        /* walk the written page list and swizzle the data */
+        list_for_each_entry(cur, &fbdefio->pagelist, lru) {
+                if (prev_index < 0) {
+                        /* just starting so assign first page */
+                        y1 = (cur->index << PAGE_SHIFT) / xres;
+                        h = h_inc;
+                } else if ((prev_index + 1) == cur->index) {
+                        /* this page is consecutive so increase our height */
+                        h += h_inc;
+                } else {
+                        /* page not consecutive, issue previous update first */
+                        broadsheetfb_dpy_update_pages(info->par, y1, y1 + h);
+                        /* start over with our non consecutive page */
+                        y1 = (cur->index << PAGE_SHIFT) / xres;
+                        h = h_inc;
+                }
+                prev_index = cur->index;
+        }
+
+        /* if we still have any pages to update we do so now */
+        if (h >= yres) {
+                /* its a full screen update, just do it */
+                broadsheetfb_dpy_update(info->par);
+        } else {
+                broadsheetfb_dpy_update_pages(info->par, y1,
+                                                min((u16) (y1 + h), yres));
+        }
+}
+
+static void broadsheetfb_fillrect(struct fb_info *info,
+                                   const struct fb_fillrect *rect)
+{
+        struct broadsheetfb_par *par = info->par;
+
+        sys_fillrect(info, rect);
+
+        broadsheetfb_dpy_update(par);
+}
+
+static void broadsheetfb_copyarea(struct fb_info *info,
+                                   const struct fb_copyarea *area)
+{
+        struct broadsheetfb_par *par = info->par;
+
+        sys_copyarea(info, area);
+
+        broadsheetfb_dpy_update(par);
+}
+
+static void broadsheetfb_imageblit(struct fb_info *info,
+                                const struct fb_image *image)
+{
+        struct broadsheetfb_par *par = info->par;
+
+        sys_imageblit(info, image);
+
+        broadsheetfb_dpy_update(par);
+}
+
+/*
+ * this is the slow path from userspace. they can seek and write to
+ * the fb. it's inefficient to do anything less than a full screen draw
+ */
+static ssize_t broadsheetfb_write(struct fb_info *info, const char __user *buf,
+                                size_t count, loff_t *ppos)
+{
+        struct broadsheetfb_par *par = info->par;
+        unsigned long p = *ppos;
+        void *dst;
+        int err = 0;
+        unsigned long total_size;
+
+        if (info->state != FBINFO_STATE_RUNNING)
+                return -EPERM;
+
+        total_size = info->fix.smem_len;
+
+        if (p > total_size)
+                return -EFBIG;
+
+        if (count > total_size) {
+                err = -EFBIG;
+                count = total_size;
+        }
+
+        if (count + p > total_size) {
+                if (!err)
+                        err = -ENOSPC;
+
+                count = total_size - p;
+        }
+
+        dst = (void *)(info->screen_base + p);
+
+        if (copy_from_user(dst, buf, count))
+                err = -EFAULT;
+
+        if  (!err)
+                *ppos += count;
+
+        broadsheetfb_dpy_update(par);
+
+        return (err) ? err : count;
+}
+
+static struct fb_ops broadsheetfb_ops = {
+        .owner          = THIS_MODULE,
+        .fb_read        = fb_sys_read,
+        .fb_write       = broadsheetfb_write,
+        .fb_fillrect    = broadsheetfb_fillrect,
+        .fb_copyarea    = broadsheetfb_copyarea,
+        .fb_imageblit   = broadsheetfb_imageblit,
+};
+
+static struct fb_deferred_io broadsheetfb_defio = {
+        .delay          = HZ/4,
+        .deferred_io    = broadsheetfb_dpy_deferred_io,
+};
+
+static int __devinit broadsheetfb_probe(struct platform_device *dev)
+{
+        struct fb_info *info;
+        struct broadsheet_board *board;
+        int retval = -ENOMEM;
+        int videomemorysize;
+        unsigned char *videomemory;
+        struct broadsheetfb_par *par;
+        int i;
+
+        /* pick up board specific routines */
+        board = dev->dev.platform_data;
+        if (!board)
+                return -EINVAL;
+
+        /* try to count device specific driver, if can't, platform recalls */
+        if (!try_module_get(board->owner))
+                return -ENODEV;
+
+        info = framebuffer_alloc(sizeof(struct broadsheetfb_par), &dev->dev);
+        if (!info)
+                goto err;
+
+        videomemorysize = (DPY_W*DPY_H);
+        videomemory = vmalloc(videomemorysize);
+        if (!videomemory)
+                goto err_fb_rel;
+
+        memset(videomemory, 0, videomemorysize);
+
+        info->screen_base = (char *)videomemory;
+        info->fbops = &broadsheetfb_ops;
+
+        info->var = broadsheetfb_var;
+        info->fix = broadsheetfb_fix;
+        info->fix.smem_len = videomemorysize;
+        par = info->par;
+        par->info = info;
+        par->board = board;
+        par->write_reg = broadsheet_write_reg;
+        par->read_reg = broadsheet_read_reg;
+        init_waitqueue_head(&par->waitq);
+
+        info->flags = FBINFO_FLAG_DEFAULT;
+
+        info->fbdefio = &broadsheetfb_defio;
+        fb_deferred_io_init(info);
+
+        retval = fb_alloc_cmap(&info->cmap, 16, 0);
+        if (retval < 0) {
+                dev_err(&dev->dev, "Failed to allocate colormap\n");
+                goto err_vfree;
+        }
+
+        /* set cmap */
+        for (i = 0; i < 16; i++)
+                info->cmap.red[i] = (((2*i)+1)*(0xFFFF))/32;
+        memcpy(info->cmap.green, info->cmap.red, sizeof(u16)*16);
+        memcpy(info->cmap.blue, info->cmap.red, sizeof(u16)*16);
+
+        retval = par->board->setup_irq(info);
+        if (retval < 0)
+                goto err_cmap;
+
+        /* this inits the dpy */
+        retval = board->init(par);
+        if (retval < 0)
+                goto err_free_irq;
+
+        broadsheet_init(par);
+
+        retval = register_framebuffer(info);
+        if (retval < 0)
+                goto err_free_irq;
+        platform_set_drvdata(dev, info);
+
+        printk(KERN_INFO
+               "fb%d: Broadsheet frame buffer, using %dK of video memory\n",
+               info->node, videomemorysize >> 10);
+
+
+        return 0;
+
+err_free_irq:
+        board->cleanup(par);
+err_cmap:
+        fb_dealloc_cmap(&info->cmap);
+err_vfree:
+        vfree(videomemory);
+err_fb_rel:
+        framebuffer_release(info);
+err:
+        module_put(board->owner);
+        return retval;
+
+}
+
+static int __devexit broadsheetfb_remove(struct platform_device *dev)
+{
+        struct fb_info *info = platform_get_drvdata(dev);
+
+        if (info) {
+                struct broadsheetfb_par *par = info->par;
+                unregister_framebuffer(info);
+                fb_deferred_io_cleanup(info);
+                par->board->cleanup(par);
+                fb_dealloc_cmap(&info->cmap);
+                vfree((void *)info->screen_base);
+                module_put(par->board->owner);
+                framebuffer_release(info);
+        }
+        return 0;
+}
+
+static struct platform_driver broadsheetfb_driver = {
+        .probe  = broadsheetfb_probe,
+        .remove = broadsheetfb_remove,
+        .driver = {
+                .owner  = THIS_MODULE,
+                .name   = "broadsheetfb",
+        },
+};
+
+static int __init broadsheetfb_init(void)
+{
+        return platform_driver_register(&broadsheetfb_driver);
+}
+
+static void __exit broadsheetfb_exit(void)
+{
+        platform_driver_unregister(&broadsheetfb_driver);
+}
+
+module_init(broadsheetfb_init);
+module_exit(broadsheetfb_exit);
+
+MODULE_DESCRIPTION("fbdev driver for Broadsheet controller");
+MODULE_AUTHOR("Jaya Kumar");
+MODULE_LICENSE("GPL");