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    SubjectRe: [Linux-fbdev-devel] [PATCH] fb: SM501 framebuffer driver (#5)

    Andrew please apply.

    Acked-By: James Simmons <jsimmons@infradead.org>

    On Fri, 16 Feb 2007, Ben Dooks wrote:

    > Driver for the Silicon Motion SM501 multifunction device
    > framebuffer subsystem.
    >
    > This driver supports both the CRT and LCD panel heads,
    > with some simple acceleration for the cursor plotting
    > and support for screen panning. There is no current
    > support for bitblt/drawing engines, which should be
    > added at a later date.
    >
    > This has been tested on a number of configurations,
    > including PCI and generic-bus, on PPC, ARM and SH4
    >
    > Signed-off-by: Ben Dooks <ben-linux@fluff.org>
    > Signed-off-by: Vincent Sanders <vince@arm.linux.org.u.>
    >
    > diff -urpN -X ../dontdiff linux-2.6.20/drivers/video/Kconfig linux-2.6.20-sm501-3/drivers/video/Kconfig
    > --- linux-2.6.20/drivers/video/Kconfig 2007-02-04 18:44:54.000000000 +0000
    > +++ linux-2.6.20-sm501-3/drivers/video/Kconfig 2007-02-13 15:35:34.000000000 +0000
    > @@ -1600,6 +1600,24 @@ config FB_S3C2410_DEBUG
    > Turn on debugging messages. Note that you can set/unset at run time
    > through sysfs
    >
    > +config FB_SM501
    > + tristate "Silicon Motion SM501 framebuffer support"
    > + depends on FB && MFD_SM501
    > + select FB_CFB_FILLRECT
    > + select FB_CFB_COPYAREA
    > + select FB_CFB_IMAGEBLIT
    > + ---help---
    > + Frame buffer driver for the CRT and LCD controllers in the Silicon
    > + Motion SM501.
    > +
    > + This driver is also available as a module ( = code which can be
    > + inserted and removed from the running kernel whenever you want). The
    > + module will be called sm501fb. If you want to compile it as a module,
    > + say M here and read <file:Documentation/modules.txt>.
    > +
    > + If unsure, say N.
    > +
    > +
    > config FB_PNX4008_DUM
    > tristate "Display Update Module support on Philips PNX4008 board"
    > depends on FB && ARCH_PNX4008
    > diff -urpN -X ../dontdiff linux-2.6.20/drivers/video/Makefile linux-2.6.20-sm501-3/drivers/video/Makefile
    > --- linux-2.6.20/drivers/video/Makefile 2007-02-04 18:44:54.000000000 +0000
    > +++ linux-2.6.20-sm501-3/drivers/video/Makefile 2007-02-13 15:35:34.000000000 +0000
    > @@ -100,6 +100,7 @@ obj-$(CONFIG_FB_S3C2410) += s3c2410fb.
    > obj-$(CONFIG_FB_PNX4008_DUM) += pnx4008/
    > obj-$(CONFIG_FB_PNX4008_DUM_RGB) += pnx4008/
    > obj-$(CONFIG_FB_IBM_GXT4500) += gxt4500.o
    > +obj-$(CONFIG_FB_SM501) += sm501fb.o
    >
    > # Platform or fallback drivers go here
    > obj-$(CONFIG_FB_VESA) += vesafb.o
    > diff -urpN -X ../dontdiff linux-2.6.20/drivers/video/sm501fb.c linux-2.6.20-sm501-3/drivers/video/sm501fb.c
    > --- linux-2.6.20/drivers/video/sm501fb.c 1970-01-01 01:00:00.000000000 +0100
    > +++ linux-2.6.20-sm501-3/drivers/video/sm501fb.c 2007-02-16 09:33:07.000000000 +0000
    > @@ -0,0 +1,1786 @@
    > +/* linux/drivers/video/sm501fb.c
    > + *
    > + * Copyright (c) 2006 Simtec Electronics
    > + * Vincent Sanders <vince@simtec.co.uk>
    > + * Ben Dooks <ben@simtec.co.uk>
    > + *
    > + * This program is free software; you can redistribute it and/or modify
    > + * it under the terms of the GNU General Public License version 2 as
    > + * published by the Free Software Foundation.
    > + *
    > + * Framebuffer driver for the Silicon Motion SM501
    > + */
    > +
    > +#include <linux/module.h>
    > +#include <linux/kernel.h>
    > +#include <linux/errno.h>
    > +#include <linux/string.h>
    > +#include <linux/mm.h>
    > +#include <linux/tty.h>
    > +#include <linux/slab.h>
    > +#include <linux/delay.h>
    > +#include <linux/fb.h>
    > +#include <linux/init.h>
    > +#include <linux/vmalloc.h>
    > +#include <linux/dma-mapping.h>
    > +#include <linux/interrupt.h>
    > +#include <linux/workqueue.h>
    > +#include <linux/wait.h>
    > +#include <linux/platform_device.h>
    > +#include <linux/clk.h>
    > +
    > +#include <asm/io.h>
    > +#include <asm/uaccess.h>
    > +#include <asm/div64.h>
    > +
    > +#ifdef CONFIG_PM
    > +#include <linux/pm.h>
    > +#endif
    > +
    > +#include <linux/sm501.h>
    > +#include <linux/sm501-regs.h>
    > +
    > +#define NR_PALETTE 256
    > +
    > +enum sm501_controller {
    > + HEAD_CRT = 0,
    > + HEAD_PANEL = 1,
    > +};
    > +
    > +/* SM501 memory adress */
    > +struct sm501_mem {
    > + unsigned long size;
    > + unsigned long sm_addr;
    > + void __iomem *k_addr;
    > +};
    > +
    > +/* private data that is shared between all frambuffers* */
    > +struct sm501fb_info {
    > + struct device *dev;
    > + struct fb_info *fb[2]; /* fb info for both heads */
    > + struct resource *fbmem_res; /* framebuffer resource */
    > + struct resource *regs_res; /* registers resource */
    > + struct sm501_platdata_fb *pdata; /* our platform data */
    > +
    > + int irq;
    > + int swap_endian; /* set to swap rgb=>bgr */
    > + void __iomem *regs; /* remapped registers */
    > + void __iomem *fbmem; /* remapped framebuffer */
    > + size_t fbmem_len; /* length of remapped region */
    > +};
    > +
    > +/* per-framebuffer private data */
    > +struct sm501fb_par {
    > + u32 pseudo_palette[16];
    > +
    > + enum sm501_controller head;
    > + struct sm501_mem cursor;
    > + struct sm501_mem screen;
    > + struct fb_ops ops;
    > +
    > + void *store_fb;
    > + void *store_cursor;
    > + void __iomem *cursor_regs;
    > + struct sm501fb_info *info;
    > +};
    > +
    > +/* Helper functions */
    > +
    > +static inline int h_total(struct fb_var_screeninfo *var)
    > +{
    > + return var->xres + var->left_margin +
    > + var->right_margin + var->hsync_len;
    > +}
    > +
    > +static inline int v_total(struct fb_var_screeninfo *var)
    > +{
    > + return var->yres + var->upper_margin +
    > + var->lower_margin + var->vsync_len;
    > +}
    > +
    > +/* sm501fb_sync_regs()
    > + *
    > + * This call is mainly for PCI bus systems where we need to
    > + * ensure that any writes to the bus are completed before the
    > + * next phase, or after completing a function.
    > +*/
    > +
    > +static inline void sm501fb_sync_regs(struct sm501fb_info *info)
    > +{
    > + readl(info->regs);
    > +}
    > +
    > +/* sm501_alloc_mem
    > + *
    > + * This is an attempt to lay out memory for the two framebuffers and
    > + * everything else
    > + *
    > + * |fbmem_res->start fbmem_res->end|
    > + * | |
    > + * |fb[0].fix.smem_start | |fb[1].fix.smem_start | 2K |
    > + * |-> fb[0].fix.smem_len <-| spare |-> fb[1].fix.smem_len <-|-> cursors <-|
    > + *
    > + * The "spare" space is for the 2d engine data
    > + * the fixed is space for the cursors (2x1Kbyte)
    > + *
    > + * we need to allocate memory for the 2D acceleration engine
    > + * command list and the data for the engine to deal with.
    > + *
    > + * - all allocations must be 128bit aligned
    > + * - cursors are 64x64x2 bits (1Kbyte)
    > + *
    > + */
    > +
    > +#define SM501_MEMF_CURSOR (1)
    > +#define SM501_MEMF_PANEL (2)
    > +#define SM501_MEMF_CRT (4)
    > +#define SM501_MEMF_ACCEL (8)
    > +
    > +int sm501_alloc_mem(struct sm501fb_info *inf, struct sm501_mem *mem,
    > + unsigned int why, size_t size)
    > +{
    > + unsigned int ptr = 0;
    > +
    > + switch (why) {
    > + case SM501_MEMF_CURSOR:
    > + ptr = inf->fbmem_len - size;
    > + inf->fbmem_len = ptr;
    > + break;
    > +
    > + case SM501_MEMF_PANEL:
    > + ptr = inf->fbmem_len - size;
    > + if (ptr < inf->fb[0]->fix.smem_len)
    > + return -ENOMEM;
    > +
    > + break;
    > +
    > + case SM501_MEMF_CRT:
    > + ptr = 0;
    > + break;
    > +
    > + case SM501_MEMF_ACCEL:
    > + ptr = inf->fb[0]->fix.smem_len;
    > +
    > + if ((ptr + size) >
    > + (inf->fb[1]->fix.smem_start - inf->fbmem_res->start))
    > + return -ENOMEM;
    > + break;
    > +
    > + default:
    > + return -EINVAL;
    > + }
    > +
    > + mem->size = size;
    > + mem->sm_addr = ptr;
    > + mem->k_addr = inf->fbmem + ptr;
    > +
    > + dev_dbg(inf->dev, "%s: result %08lx, %p - %u, %zd\n",
    > + __func__, mem->sm_addr, mem->k_addr, why, size);
    > +
    > + return 0;
    > +}
    > +
    > +/* sm501fb_ps_to_hz
    > + *
    > + * Converts a period in picoseconds to Hz.
    > + *
    > + * Note, we try to keep this in Hz to minimise rounding with
    > + * the limited PLL settings on the SM501.
    > +*/
    > +
    > +static unsigned long sm501fb_ps_to_hz(unsigned long psvalue)
    > +{
    > + unsigned long long numerator=1000000000000ULL;
    > +
    > + /* 10^12 / picosecond period gives frequency in Hz */
    > + do_div(numerator, psvalue);
    > + return (unsigned long)numerator;
    > +}
    > +
    > +/* sm501fb_hz_to_ps is identical to the oposite transform */
    > +
    > +#define sm501fb_hz_to_ps(x) sm501fb_ps_to_hz(x)
    > +
    > +/* sm501fb_setup_gamma
    > + *
    > + * Programs a linear 1.0 gamma ramp in case the gamma
    > + * correction is enabled without programming anything else.
    > +*/
    > +
    > +static void sm501fb_setup_gamma(struct sm501fb_info *fbi,
    > + unsigned long palette)
    > +{
    > + unsigned long value = 0;
    > + int offset;
    > +
    > + /* set gamma values */
    > + for (offset = 0; offset < 256 * 4; offset += 4) {
    > + writel(value, fbi->regs + palette + offset);
    > + value += 0x010101; /* Advance RGB by 1,1,1.*/
    > + }
    > +}
    > +
    > +/* sm501fb_check_var
    > + *
    > + * check common variables for both panel and crt
    > +*/
    > +
    > +static int sm501fb_check_var(struct fb_var_screeninfo *var,
    > + struct fb_info *info)
    > +{
    > + struct sm501fb_par *par = info->par;
    > + struct sm501fb_info *sm = par->info;
    > + unsigned long tmp;
    > +
    > + /* check we can fit these values into the registers */
    > +
    > + if (var->hsync_len > 255 || var->vsync_len > 255)
    > + return -EINVAL;
    > +
    > + if ((var->xres + var->right_margin) >= 4096)
    > + return -EINVAL;
    > +
    > + if ((var->yres + var->lower_margin) > 2048)
    > + return -EINVAL;
    > +
    > + /* hard limits of device */
    > +
    > + if (h_total(var) > 4096 || v_total(var) > 2048)
    > + return -EINVAL;
    > +
    > + /* check our line length is going to be 128 bit aligned */
    > +
    > + tmp = (var->xres * var->bits_per_pixel) / 8;
    > + if ((tmp & 15) != 0)
    > + return -EINVAL;
    > +
    > + /* check the virtual size */
    > +
    > + if (var->xres_virtual > 4096 || var->yres_virtual > 2048)
    > + return -EINVAL;
    > +
    > + /* can cope with 8,16 or 32bpp */
    > +
    > + if (var->bits_per_pixel <= 8)
    > + var->bits_per_pixel = 8;
    > + else if (var->bits_per_pixel <= 16)
    > + var->bits_per_pixel = 16;
    > + else if (var->bits_per_pixel == 24)
    > + var->bits_per_pixel = 32;
    > +
    > + /* set r/g/b positions and validate bpp */
    > + switch(var->bits_per_pixel) {
    > + case 8:
    > + var->red.length = var->bits_per_pixel;
    > + var->red.offset = 0;
    > + var->green.length = var->bits_per_pixel;
    > + var->green.offset = 0;
    > + var->blue.length = var->bits_per_pixel;
    > + var->blue.offset = 0;
    > + var->transp.length = 0;
    > +
    > + break;
    > +
    > + case 16:
    > + if (sm->pdata->flags & SM501_FBPD_SWAP_FB_ENDIAN) {
    > + var->red.offset = 11;
    > + var->green.offset = 5;
    > + var->blue.offset = 0;
    > + } else {
    > + var->blue.offset = 11;
    > + var->green.offset = 5;
    > + var->red.offset = 0;
    > + }
    > +
    > + var->red.length = 5;
    > + var->green.length = 6;
    > + var->blue.length = 5;
    > + var->transp.length = 0;
    > + break;
    > +
    > + case 32:
    > + if (sm->pdata->flags & SM501_FBPD_SWAP_FB_ENDIAN) {
    > + var->transp.offset = 0;
    > + var->red.offset = 8;
    > + var->green.offset = 16;
    > + var->blue.offset = 24;
    > + } else {
    > + var->transp.offset = 24;
    > + var->red.offset = 16;
    > + var->green.offset = 8;
    > + var->blue.offset = 0;
    > + }
    > +
    > + var->red.length = 8;
    > + var->green.length = 8;
    > + var->blue.length = 8;
    > + var->transp.length = 0;
    > + break;
    > +
    > + default:
    > + return -EINVAL;
    > + }
    > +
    > + return 0;
    > +}
    > +
    > +/*
    > + * sm501fb_check_var_crt():
    > + *
    > + * check the parameters for the CRT head, and either bring them
    > + * back into range, or return -EINVAL.
    > +*/
    > +
    > +static int sm501fb_check_var_crt(struct fb_var_screeninfo *var,
    > + struct fb_info *info)
    > +{
    > + return sm501fb_check_var(var, info);
    > +}
    > +
    > +/* sm501fb_check_var_pnl():
    > + *
    > + * check the parameters for the CRT head, and either bring them
    > + * back into range, or return -EINVAL.
    > +*/
    > +
    > +static int sm501fb_check_var_pnl(struct fb_var_screeninfo *var,
    > + struct fb_info *info)
    > +{
    > + return sm501fb_check_var(var, info);
    > +}
    > +
    > +/* sm501fb_set_par_common
    > + *
    > + * set common registers for framebuffers
    > +*/
    > +
    > +static int sm501fb_set_par_common(struct fb_info *info,
    > + struct fb_var_screeninfo *var)
    > +{
    > + struct sm501fb_par *par = info->par;
    > + struct sm501fb_info *fbi = par->info;
    > + unsigned long pixclock; /* pixelclock in Hz */
    > + unsigned long sm501pixclock; /* pixelclock the 501 can achive in Hz */
    > + unsigned int mem_type;
    > + unsigned int clock_type;
    > + unsigned int head_addr;
    > +
    > + dev_dbg(fbi->dev, "%s: %dx%d, bpp = %d, virtual %dx%d\n",
    > + __func__, var->xres, var->yres, var->bits_per_pixel,
    > + var->xres_virtual, var->yres_virtual);
    > +
    > + switch (par->head) {
    > + case HEAD_CRT:
    > + mem_type = SM501_MEMF_CRT;
    > + clock_type = SM501_CLOCK_V2XCLK;
    > + head_addr = SM501_DC_CRT_FB_ADDR;
    > + break;
    > +
    > + case HEAD_PANEL:
    > + mem_type = SM501_MEMF_PANEL;
    > + clock_type = SM501_CLOCK_P2XCLK;
    > + head_addr = SM501_DC_PANEL_FB_ADDR;
    > + break;
    > +
    > + default:
    > + mem_type = 0; /* stop compiler warnings */
    > + head_addr = 0;
    > + clock_type = 0;
    > + }
    > +
    > + switch (var->bits_per_pixel) {
    > + case 8:
    > + info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
    > + break;
    > +
    > + case 16:
    > + info->fix.visual = FB_VISUAL_DIRECTCOLOR;
    > + break;
    > +
    > + case 32:
    > + info->fix.visual = FB_VISUAL_TRUECOLOR;
    > + break;
    > + }
    > +
    > + /* allocate fb memory within 501 */
    > + info->fix.line_length = (var->xres_virtual * var->bits_per_pixel)/8;
    > + info->fix.smem_len = info->fix.line_length * var->yres_virtual;
    > +
    > + dev_dbg(fbi->dev, "%s: line length = %u\n", __func__,
    > + info->fix.line_length);
    > +
    > + if (sm501_alloc_mem(fbi, &par->screen, mem_type,
    > + info->fix.smem_len)) {
    > + dev_err(fbi->dev, "no memory available\n");
    > + return -ENOMEM;
    > + }
    > +
    > + info->fix.smem_start = fbi->fbmem_res->start + par->screen.sm_addr;
    > +
    > + info->screen_base = fbi->fbmem + par->screen.sm_addr;
    > + info->screen_size = info->fix.smem_len;
    > +
    > + /* set start of framebuffer to the screen */
    > +
    > + writel(par->screen.sm_addr | SM501_ADDR_FLIP, fbi->regs + head_addr);
    > +
    > + /* program CRT clock */
    > +
    > + pixclock = sm501fb_ps_to_hz(var->pixclock);
    > +
    > + sm501pixclock = sm501_set_clock(fbi->dev->parent, clock_type,
    > + pixclock);
    > +
    > + /* update fb layer with actual clock used */
    > + var->pixclock = sm501fb_hz_to_ps(sm501pixclock);
    > +
    > + dev_dbg(fbi->dev, "%s: pixclock(ps) = %u, pixclock(Hz) = %lu, "
    > + "sm501pixclock = %lu, error = %ld%%\n",
    > + __func__, var->pixclock, pixclock, sm501pixclock,
    > + ((pixclock - sm501pixclock)*100)/pixclock);
    > +
    > + return 0;
    > +}
    > +
    > +/* sm501fb_set_par_geometry
    > + *
    > + * set the geometry registers for specified framebuffer.
    > +*/
    > +
    > +static void sm501fb_set_par_geometry(struct fb_info *info,
    > + struct fb_var_screeninfo *var)
    > +{
    > + struct sm501fb_par *par = info->par;
    > + struct sm501fb_info *fbi = par->info;
    > + void __iomem *base = fbi->regs;
    > + unsigned long reg;
    > +
    > + if (par->head == HEAD_CRT)
    > + base += SM501_DC_CRT_H_TOT;
    > + else
    > + base += SM501_DC_PANEL_H_TOT;
    > +
    > + /* set framebuffer width and display width */
    > +
    > + reg = info->fix.line_length;
    > + reg |= ((var->xres * var->bits_per_pixel)/8) << 16;
    > +
    > + writel(reg, fbi->regs + (par->head == HEAD_CRT ?
    > + SM501_DC_CRT_FB_OFFSET : SM501_DC_PANEL_FB_OFFSET));
    > +
    > + /* program horizontal total */
    > +
    > + reg = (h_total(var) - 1) << 16;
    > + reg |= (var->xres - 1);
    > +
    > + writel(reg, base + SM501_OFF_DC_H_TOT);
    > +
    > + /* program horizontal sync */
    > +
    > + reg = var->hsync_len << 16;
    > + reg |= var->xres + var->right_margin - 1;
    > +
    > + writel(reg, base + SM501_OFF_DC_H_SYNC);
    > +
    > + /* program vertical total */
    > +
    > + reg = (v_total(var) - 1) << 16;
    > + reg |= (var->yres - 1);
    > +
    > + writel(reg, base + SM501_OFF_DC_V_TOT);
    > +
    > + /* program vertical sync */
    > + reg = var->vsync_len << 16;
    > + reg |= var->yres + var->lower_margin - 1;
    > +
    > + writel(reg, base + SM501_OFF_DC_V_SYNC);
    > +}
    > +
    > +/* sm501fb_pan_crt
    > + *
    > + * pan the CRT display output within an virtual framebuffer
    > +*/
    > +
    > +static int sm501fb_pan_crt(struct fb_var_screeninfo *var,
    > + struct fb_info *info)
    > +{
    > + struct sm501fb_par *par = info->par;
    > + struct sm501fb_info *fbi = par->info;
    > + unsigned int bytes_pixel = var->bits_per_pixel / 8;
    > + unsigned long reg;
    > + unsigned long xoffs;
    > +
    > + xoffs = var->xoffset * bytes_pixel;
    > +
    > + reg = readl(fbi->regs + SM501_DC_CRT_CONTROL);
    > +
    > + reg &= ~SM501_DC_CRT_CONTROL_PIXEL_MASK;
    > + reg |= ((xoffs & 15) / bytes_pixel) << 4;
    > + writel(reg, fbi->regs + SM501_DC_CRT_CONTROL);
    > +
    > + reg = (par->screen.sm_addr + xoffs +
    > + var->yoffset * info->fix.line_length);
    > + writel(reg | SM501_ADDR_FLIP, fbi->regs + SM501_DC_CRT_FB_ADDR);
    > +
    > + sm501fb_sync_regs(fbi);
    > + return 0;
    > +}
    > +
    > +/* sm501fb_pan_pnl
    > + *
    > + * pan the panel display output within an virtual framebuffer
    > +*/
    > +
    > +static int sm501fb_pan_pnl(struct fb_var_screeninfo *var,
    > + struct fb_info *info)
    > +{
    > + struct sm501fb_par *par = info->par;
    > + struct sm501fb_info *fbi = par->info;
    > + unsigned long reg;
    > +
    > + reg = var->xoffset | (var->xres_virtual << 16);
    > + writel(reg, fbi->regs + SM501_DC_PANEL_FB_WIDTH);
    > +
    > + reg = var->yoffset | (var->yres_virtual << 16);
    > + writel(reg, fbi->regs + SM501_DC_PANEL_FB_HEIGHT);
    > +
    > + sm501fb_sync_regs(fbi);
    > + return 0;
    > +}
    > +
    > +/* sm501fb_set_par_crt
    > + *
    > + * Set the CRT video mode from the fb_info structure
    > +*/
    > +
    > +static int sm501fb_set_par_crt(struct fb_info *info)
    > +{
    > + struct sm501fb_par *par = info->par;
    > + struct sm501fb_info *fbi = par->info;
    > + struct fb_var_screeninfo *var = &info->var;
    > + unsigned long control; /* control register */
    > + int ret;
    > +
    > + /* activate new configuration */
    > +
    > + dev_dbg(fbi->dev, "%s(%p)\n", __func__, info);
    > +
    > + /* enable CRT DAC - note 0 is on!*/
    > + sm501_misc_control(fbi->dev->parent, 0, SM501_MISC_DAC_POWER);
    > +
    > + control = readl(fbi->regs + SM501_DC_CRT_CONTROL);
    > +
    > + control &= (SM501_DC_CRT_CONTROL_PIXEL_MASK |
    > + SM501_DC_CRT_CONTROL_GAMMA |
    > + SM501_DC_CRT_CONTROL_BLANK |
    > + SM501_DC_CRT_CONTROL_SEL |
    > + SM501_DC_CRT_CONTROL_CP |
    > + SM501_DC_CRT_CONTROL_TVP);
    > +
    > + /* set the sync polarities before we check data source */
    > +
    > + if ((var->sync & FB_SYNC_HOR_HIGH_ACT) == 0)
    > + control |= SM501_DC_CRT_CONTROL_HSP;
    > +
    > + if ((var->sync & FB_SYNC_VERT_HIGH_ACT) == 0)
    > + control |= SM501_DC_CRT_CONTROL_VSP;
    > +
    > + if ((control & SM501_DC_CRT_CONTROL_SEL) == 0) {
    > + /* the head is displaying panel data... */
    > +
    > + sm501_alloc_mem(fbi, &par->screen, SM501_MEMF_CRT, 0);
    > + goto out_update;
    > + }
    > +
    > + ret = sm501fb_set_par_common(info, var);
    > + if (ret) {
    > + dev_err(fbi->dev, "failed to set common parameters\n");
    > + return ret;
    > + }
    > +
    > + sm501fb_pan_crt(var, info);
    > + sm501fb_set_par_geometry(info, var);
    > +
    > + control |= SM501_FIFO_3; /* fill if >3 free slots */
    > +
    > + switch(var->bits_per_pixel) {
    > + case 8:
    > + control |= SM501_DC_CRT_CONTROL_8BPP;
    > + break;
    > +
    > + case 16:
    > + control |= SM501_DC_CRT_CONTROL_16BPP;
    > + break;
    > +
    > + case 32:
    > + control |= SM501_DC_CRT_CONTROL_32BPP;
    > + sm501fb_setup_gamma(fbi, SM501_DC_CRT_PALETTE);
    > + break;
    > +
    > + default:
    > + BUG();
    > + }
    > +
    > + control |= SM501_DC_CRT_CONTROL_SEL; /* CRT displays CRT data */
    > + control |= SM501_DC_CRT_CONTROL_TE; /* enable CRT timing */
    > + control |= SM501_DC_CRT_CONTROL_ENABLE; /* enable CRT plane */
    > +
    > + out_update:
    > + dev_dbg(fbi->dev, "new control is %08lx\n", control);
    > +
    > + writel(control, fbi->regs + SM501_DC_CRT_CONTROL);
    > + sm501fb_sync_regs(fbi);
    > +
    > + return 0;
    > +}
    > +
    > +static void sm501fb_panel_power(struct sm501fb_info *fbi, int to)
    > +{
    > + unsigned long control;
    > + void __iomem *ctrl_reg = fbi->regs + SM501_DC_PANEL_CONTROL;
    > +
    > + control = readl(ctrl_reg);
    > +
    > + if (to && (control & SM501_DC_PANEL_CONTROL_VDD) == 0) {
    > + /* enable panel power */
    > +
    > + control |= SM501_DC_PANEL_CONTROL_VDD; /* FPVDDEN */
    > + writel(control, ctrl_reg);
    > + sm501fb_sync_regs(fbi);
    > + mdelay(10);
    > +
    > + control |= SM501_DC_PANEL_CONTROL_DATA; /* DATA */
    > + writel(control, ctrl_reg);
    > + sm501fb_sync_regs(fbi);
    > + mdelay(10);
    > +
    > + control |= SM501_DC_PANEL_CONTROL_BIAS; /* VBIASEN */
    > + writel(control, ctrl_reg);
    > + sm501fb_sync_regs(fbi);
    > + mdelay(10);
    > +
    > + control |= SM501_DC_PANEL_CONTROL_FPEN;
    > + writel(control, ctrl_reg);
    > +
    > + } else if (!to && (control & SM501_DC_PANEL_CONTROL_VDD) != 0) {
    > + /* disable panel power */
    > +
    > + control &= ~SM501_DC_PANEL_CONTROL_FPEN;
    > + writel(control, ctrl_reg);
    > + sm501fb_sync_regs(fbi);
    > + mdelay(10);
    > +
    > + control &= ~SM501_DC_PANEL_CONTROL_BIAS;
    > + writel(control, ctrl_reg);
    > + sm501fb_sync_regs(fbi);
    > + mdelay(10);
    > +
    > + control &= ~SM501_DC_PANEL_CONTROL_DATA;
    > + writel(control, ctrl_reg);
    > + sm501fb_sync_regs(fbi);
    > + mdelay(10);
    > +
    > + control &= ~SM501_DC_PANEL_CONTROL_VDD;
    > + writel(control, ctrl_reg);
    > + sm501fb_sync_regs(fbi);
    > + mdelay(10);
    > + }
    > +
    > + sm501fb_sync_regs(fbi);
    > +}
    > +
    > +/* sm501fb_set_par_pnl
    > + *
    > + * Set the panel video mode from the fb_info structure
    > +*/
    > +
    > +static int sm501fb_set_par_pnl(struct fb_info *info)
    > +{
    > + struct sm501fb_par *par = info->par;
    > + struct sm501fb_info *fbi = par->info;
    > + struct fb_var_screeninfo *var = &info->var;
    > + unsigned long control;
    > + unsigned long reg;
    > + int ret;
    > +
    > + dev_dbg(fbi->dev, "%s(%p)\n", __func__, info);
    > +
    > + /* activate this new configuration */
    > +
    > + ret = sm501fb_set_par_common(info, var);
    > + if (ret)
    > + return ret;
    > +
    > + sm501fb_pan_pnl(var, info);
    > + sm501fb_set_par_geometry(info, var);
    > +
    > + /* update control register */
    > +
    > + control = readl(fbi->regs + SM501_DC_PANEL_CONTROL);
    > + control &= (SM501_DC_PANEL_CONTROL_GAMMA |
    > + SM501_DC_PANEL_CONTROL_VDD |
    > + SM501_DC_PANEL_CONTROL_DATA |
    > + SM501_DC_PANEL_CONTROL_BIAS |
    > + SM501_DC_PANEL_CONTROL_FPEN |
    > + SM501_DC_PANEL_CONTROL_CP |
    > + SM501_DC_PANEL_CONTROL_CK |
    > + SM501_DC_PANEL_CONTROL_HP |
    > + SM501_DC_PANEL_CONTROL_VP |
    > + SM501_DC_PANEL_CONTROL_HPD |
    > + SM501_DC_PANEL_CONTROL_VPD);
    > +
    > + control |= SM501_FIFO_3; /* fill if >3 free slots */
    > +
    > + switch(var->bits_per_pixel) {
    > + case 8:
    > + control |= SM501_DC_PANEL_CONTROL_8BPP;
    > + break;
    > +
    > + case 16:
    > + control |= SM501_DC_PANEL_CONTROL_16BPP;
    > + break;
    > +
    > + case 32:
    > + control |= SM501_DC_PANEL_CONTROL_32BPP;
    > + sm501fb_setup_gamma(fbi, SM501_DC_PANEL_PALETTE);
    > + break;
    > +
    > + default:
    > + BUG();
    > + }
    > +
    > + writel(0x0, fbi->regs + SM501_DC_PANEL_PANNING_CONTROL);
    > +
    > + /* panel plane top left and bottom right location */
    > +
    > + writel(0x00, fbi->regs + SM501_DC_PANEL_TL_LOC);
    > +
    > + reg = var->xres - 1;
    > + reg |= (var->yres - 1) << 16;
    > +
    > + writel(reg, fbi->regs + SM501_DC_PANEL_BR_LOC);
    > +
    > + /* program panel control register */
    > +
    > + control |= SM501_DC_PANEL_CONTROL_TE; /* enable PANEL timing */
    > + control |= SM501_DC_PANEL_CONTROL_EN; /* enable PANEL gfx plane */
    > +
    > + if ((var->sync & FB_SYNC_HOR_HIGH_ACT) == 0)
    > + control |= SM501_DC_PANEL_CONTROL_HSP;
    > +
    > + if ((var->sync & FB_SYNC_VERT_HIGH_ACT) == 0)
    > + control |= SM501_DC_PANEL_CONTROL_VSP;
    > +
    > + writel(control, fbi->regs + SM501_DC_PANEL_CONTROL);
    > + sm501fb_sync_regs(fbi);
    > +
    > + /* power the panel up */
    > + sm501fb_panel_power(fbi, 1);
    > + return 0;
    > +}
    > +
    > +
    > +/* chan_to_field
    > + *
    > + * convert a colour value into a field position
    > + *
    > + * from pxafb.c
    > +*/
    > +
    > +static inline unsigned int chan_to_field(unsigned int chan,
    > + struct fb_bitfield *bf)
    > +{
    > + chan &= 0xffff;
    > + chan >>= 16 - bf->length;
    > + return chan << bf->offset;
    > +}
    > +
    > +/* sm501fb_setcolreg
    > + *
    > + * set the colour mapping for modes that support palettised data
    > +*/
    > +
    > +static int sm501fb_setcolreg(unsigned regno,
    > + unsigned red, unsigned green, unsigned blue,
    > + unsigned transp, struct fb_info *info)
    > +{
    > + struct sm501fb_par *par = info->par;
    > + struct sm501fb_info *fbi = par->info;
    > + void __iomem *base = fbi->regs;
    > + unsigned int val;
    > +
    > + if (par->head == HEAD_CRT)
    > + base += SM501_DC_CRT_PALETTE;
    > + else
    > + base += SM501_DC_PANEL_PALETTE;
    > +
    > + switch (info->fix.visual) {
    > + case FB_VISUAL_TRUECOLOR:
    > + /* true-colour, use pseuo-palette */
    > +
    > + if (regno < 16) {
    > + u32 *pal = par->pseudo_palette;
    > +
    > + val = chan_to_field(red, &info->var.red);
    > + val |= chan_to_field(green, &info->var.green);
    > + val |= chan_to_field(blue, &info->var.blue);
    > +
    > + pal[regno] = val;
    > + }
    > + break;
    > +
    > + case FB_VISUAL_PSEUDOCOLOR:
    > + if (regno < 256) {
    > + val = (red >> 8) << 16;
    > + val |= (green >> 8) << 8;
    > + val |= blue >> 8;
    > +
    > + writel(val, base + (regno * 4));
    > + }
    > +
    > + break;
    > +
    > + default:
    > + return 1; /* unknown type */
    > + }
    > +
    > + return 0;
    > +}
    > +
    > +/* sm501fb_blank_pnl
    > + *
    > + * Blank or un-blank the panel interface
    > +*/
    > +
    > +static int sm501fb_blank_pnl(int blank_mode, struct fb_info *info)
    > +{
    > + struct sm501fb_par *par = info->par;
    > + struct sm501fb_info *fbi = par->info;
    > +
    > + dev_dbg(fbi->dev, "%s(mode=%d, %p)\n", __func__, blank_mode, info);
    > +
    > + switch (blank_mode) {
    > + case FB_BLANK_POWERDOWN:
    > + sm501fb_panel_power(fbi, 0);
    > + break;
    > +
    > + case FB_BLANK_UNBLANK:
    > + sm501fb_panel_power(fbi, 1);
    > + break;
    > +
    > + case FB_BLANK_NORMAL:
    > + case FB_BLANK_VSYNC_SUSPEND:
    > + case FB_BLANK_HSYNC_SUSPEND:
    > + default:
    > + return 1;
    > + }
    > +
    > + return 0;
    > +}
    > +
    > +/* sm501fb_blank_crt
    > + *
    > + * Blank or un-blank the crt interface
    > +*/
    > +
    > +static int sm501fb_blank_crt(int blank_mode, struct fb_info *info)
    > +{
    > + struct sm501fb_par *par = info->par;
    > + struct sm501fb_info *fbi = par->info;
    > + unsigned long ctrl;
    > +
    > + dev_dbg(fbi->dev, "%s(mode=%d, %p)\n", __func__, blank_mode, info);
    > +
    > + ctrl = readl(fbi->regs + SM501_DC_CRT_CONTROL);
    > +
    > + switch (blank_mode) {
    > + case FB_BLANK_POWERDOWN:
    > + ctrl &= ~SM501_DC_CRT_CONTROL_ENABLE;
    > + sm501_misc_control(fbi->dev->parent, SM501_MISC_DAC_POWER, 0);
    > +
    > + case FB_BLANK_NORMAL:
    > + ctrl |= SM501_DC_CRT_CONTROL_BLANK;
    > + break;
    > +
    > + case FB_BLANK_UNBLANK:
    > + ctrl &= ~SM501_DC_CRT_CONTROL_BLANK;
    > + ctrl |= SM501_DC_CRT_CONTROL_ENABLE;
    > + sm501_misc_control(fbi->dev->parent, 0, SM501_MISC_DAC_POWER);
    > + break;
    > +
    > + case FB_BLANK_VSYNC_SUSPEND:
    > + case FB_BLANK_HSYNC_SUSPEND:
    > + default:
    > + return 1;
    > +
    > + }
    > +
    > + writel(ctrl, fbi->regs + SM501_DC_CRT_CONTROL);
    > + sm501fb_sync_regs(fbi);
    > +
    > + return 0;
    > +}
    > +
    > +/* sm501fb_cursor
    > + *
    > + * set or change the hardware cursor parameters
    > +*/
    > +
    > +int sm501fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
    > +{
    > + struct sm501fb_par *par = info->par;
    > + struct sm501fb_info *fbi = par->info;
    > + void __iomem *base = fbi->regs;
    > + unsigned long hwc_addr;
    > + unsigned long fg, bg;
    > +
    > + dev_dbg(fbi->dev, "%s(%p,%p)\n", __func__, info, cursor);
    > +
    > + if (par->head == HEAD_CRT)
    > + base += SM501_DC_CRT_HWC_BASE;
    > + else
    > + base += SM501_DC_PANEL_HWC_BASE;
    > +
    > + /* check not being asked to exceed capabilities */
    > +
    > + if (cursor->image.width > 64)
    > + return -EINVAL;
    > +
    > + if (cursor->image.height > 64)
    > + return -EINVAL;
    > +
    > + if (cursor->image.depth > 1)
    > + return -EINVAL;
    > +
    > + hwc_addr = readl(base + SM501_OFF_HWC_ADDR);
    > +
    > + if (cursor->enable)
    > + writel(hwc_addr | SM501_HWC_EN, base + SM501_OFF_HWC_ADDR);
    > + else
    > + writel(hwc_addr & ~SM501_HWC_EN, base + SM501_OFF_HWC_ADDR);
    > +
    > + /* set data */
    > + if (cursor->set & FB_CUR_SETPOS) {
    > + unsigned int x = cursor->image.dx;
    > + unsigned int y = cursor->image.dy;
    > +
    > + if (x >= 2048 || y >= 2048 )
    > + return -EINVAL;
    > +
    > + dev_dbg(fbi->dev, "set position %d,%d\n", x, y);
    > +
    > + //y += cursor->image.height;
    > +
    > + writel(x | (y << 16), base + SM501_OFF_HWC_LOC);
    > + }
    > +
    > + if (cursor->set & FB_CUR_SETCMAP) {
    > + unsigned int bg_col = cursor->image.bg_color;
    > + unsigned int fg_col = cursor->image.fg_color;
    > +
    > + dev_dbg(fbi->dev, "%s: update cmap (%08x,%08x)\n",
    > + __func__, bg_col, fg_col);
    > +
    > + bg = ((info->cmap.red[bg_col] & 0xF8) << 8) |
    > + ((info->cmap.green[bg_col] & 0xFC) << 3) |
    > + ((info->cmap.blue[bg_col] & 0xF8) >> 3);
    > +
    > + fg = ((info->cmap.red[fg_col] & 0xF8) << 8) |
    > + ((info->cmap.green[fg_col] & 0xFC) << 3) |
    > + ((info->cmap.blue[fg_col] & 0xF8) >> 3);
    > +
    > + dev_dbg(fbi->dev, "fgcol %08x, bgcol %08x\n", fg, bg);
    > +
    > + writel(bg, base + SM501_OFF_HWC_COLOR_1_2);
    > + writel(fg, base + SM501_OFF_HWC_COLOR_3);
    > + }
    > +
    > + if (cursor->set & FB_CUR_SETSIZE ||
    > + cursor->set & (FB_CUR_SETIMAGE | FB_CUR_SETSHAPE)) {
    > + /* SM501 cursor is a two bpp 64x64 bitmap this routine
    > + * clears it to transparent then combines the cursor
    > + * shape plane with the colour plane to set the
    > + * cursor */
    > + int x, y;
    > + const unsigned char *pcol = cursor->image.data;
    > + const unsigned char *pmsk = cursor->mask;
    > + void __iomem *dst = par->cursor.k_addr;
    > + unsigned char dcol = 0;
    > + unsigned char dmsk = 0;
    > + unsigned int op;
    > +
    > + dev_dbg(fbi->dev, "%s: setting shape (%d,%d)\n",
    > + __func__, cursor->image.width, cursor->image.height);
    > +
    > + for (op = 0; op < (64*64*2)/8; op+=4)
    > + writel(0x0, dst + op);
    > +
    > + for (y = 0; y < cursor->image.height; y++) {
    > + for (x = 0; x < cursor->image.width; x++) {
    > + if ((x % 8) == 0) {
    > + dcol = *pcol++;
    > + dmsk = *pmsk++;
    > + } else {
    > + dcol >>= 1;
    > + dmsk >>= 1;
    > + }
    > +
    > + if (dmsk & 1) {
    > + op = (dcol & 1) ? 1 : 3;
    > + op <<= ((x % 4) * 2);
    > +
    > + op |= readb(dst + (x / 4));
    > + writeb(op, dst + (x / 4));
    > + }
    > + }
    > + dst += (64*2)/8;
    > + }
    > + }
    > +
    > + sm501fb_sync_regs(fbi); /* ensure cursor data flushed */
    > + return 0;
    > +}
    > +
    > +/* sm501fb_crtsrc_show
    > + *
    > + * device attribute code to show where the crt output is sourced from
    > +*/
    > +
    > +static int sm501fb_crtsrc_show(struct device *dev,
    > + struct device_attribute *attr, char *buf)
    > +{
    > + struct sm501fb_info *info = dev_get_drvdata(dev);
    > + unsigned long ctrl;
    > +
    > + ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
    > + ctrl &= SM501_DC_CRT_CONTROL_SEL;
    > +
    > + return snprintf(buf, PAGE_SIZE, "%s\n", ctrl ? "crt" : "panel");
    > +}
    > +
    > +/* sm501fb_crtsrc_show
    > + *
    > + * device attribute code to set where the crt output is sourced from
    > +*/
    > +
    > +static int sm501fb_crtsrc_store(struct device *dev,
    > + struct device_attribute *attr,
    > + const char *buf, size_t len)
    > +{
    > + struct sm501fb_info *info = dev_get_drvdata(dev);
    > + enum sm501_controller head;
    > + unsigned long ctrl;
    > +
    > + if (len < 1)
    > + return -EINVAL;
    > +
    > + if (strnicmp(buf, "crt", sizeof("crt")) == 0)
    > + head = HEAD_CRT;
    > + else if (strnicmp(buf, "panel", sizeof("panel")) == 0)
    > + head = HEAD_PANEL;
    > + else
    > + return -EINVAL;
    > +
    > + dev_info(dev, "setting crt source to head %d\n", head);
    > +
    > + ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
    > +
    > + if (head == HEAD_CRT) {
    > + ctrl |= SM501_DC_CRT_CONTROL_SEL;
    > + ctrl |= SM501_DC_CRT_CONTROL_ENABLE;
    > + ctrl |= SM501_DC_CRT_CONTROL_TE;
    > + } else {
    > + ctrl &= ~SM501_DC_CRT_CONTROL_SEL;
    > + ctrl &= ~SM501_DC_CRT_CONTROL_ENABLE;
    > + ctrl &= ~SM501_DC_CRT_CONTROL_TE;
    > + }
    > +
    > + writel(ctrl, info->regs + SM501_DC_CRT_CONTROL);
    > + sm501fb_sync_regs(info);
    > +
    > + return (head == HEAD_CRT) ? 3 : 5;
    > +}
    > +
    > +/* Prepare the device_attr for registration with sysfs later */
    > +static DEVICE_ATTR(crt_src, 0666, sm501fb_crtsrc_show, sm501fb_crtsrc_store);
    > +
    > +/* sm501fb_show_regs
    > + *
    > + * show the primary sm501 registers
    > +*/
    > +static int sm501fb_show_regs(struct sm501fb_info *info, char *ptr,
    > + unsigned int start, unsigned int len)
    > +{
    > + void __iomem *mem = info->regs;
    > + char *buf = ptr;
    > + unsigned int reg;
    > +
    > + for (reg = start; reg < (len + start); reg += 4)
    > + ptr += sprintf(ptr, "%08x = %08x\n", reg, readl(mem + reg));
    > +
    > + return ptr - buf;
    > +}
    > +
    > +/* sm501fb_debug_show_crt
    > + *
    > + * show the crt control and cursor registers
    > +*/
    > +
    > +static int sm501fb_debug_show_crt(struct device *dev,
    > + struct device_attribute *attr, char *buf)
    > +{
    > + struct sm501fb_info *info = dev_get_drvdata(dev);
    > + char *ptr = buf;
    > +
    > + ptr += sm501fb_show_regs(info, ptr, SM501_DC_CRT_CONTROL, 0x40);
    > + ptr += sm501fb_show_regs(info, ptr, SM501_DC_CRT_HWC_BASE, 0x10);
    > +
    > + return ptr - buf;
    > +}
    > +
    > +static DEVICE_ATTR(fbregs_crt, 0444, sm501fb_debug_show_crt, NULL);
    > +
    > +/* sm501fb_debug_show_pnl
    > + *
    > + * show the panel control and cursor registers
    > +*/
    > +
    > +static int sm501fb_debug_show_pnl(struct device *dev,
    > + struct device_attribute *attr, char *buf)
    > +{
    > + struct sm501fb_info *info = dev_get_drvdata(dev);
    > + char *ptr = buf;
    > +
    > + ptr += sm501fb_show_regs(info, ptr, 0x0, 0x40);
    > + ptr += sm501fb_show_regs(info, ptr, SM501_DC_PANEL_HWC_BASE, 0x10);
    > +
    > + return ptr - buf;
    > +}
    > +
    > +static DEVICE_ATTR(fbregs_pnl, 0444, sm501fb_debug_show_pnl, NULL);
    > +
    > +/* framebuffer ops */
    > +
    > +static struct fb_ops sm501fb_ops_crt = {
    > + .owner = THIS_MODULE,
    > + .fb_check_var = sm501fb_check_var_crt,
    > + .fb_set_par = sm501fb_set_par_crt,
    > + .fb_blank = sm501fb_blank_crt,
    > + .fb_setcolreg = sm501fb_setcolreg,
    > + .fb_pan_display = sm501fb_pan_crt,
    > + .fb_cursor = sm501fb_cursor,
    > + .fb_fillrect = cfb_fillrect,
    > + .fb_copyarea = cfb_copyarea,
    > + .fb_imageblit = cfb_imageblit,
    > +};
    > +
    > +static struct fb_ops sm501fb_ops_pnl = {
    > + .owner = THIS_MODULE,
    > + .fb_check_var = sm501fb_check_var_pnl,
    > + .fb_set_par = sm501fb_set_par_pnl,
    > + .fb_pan_display = sm501fb_pan_pnl,
    > + .fb_blank = sm501fb_blank_pnl,
    > + .fb_setcolreg = sm501fb_setcolreg,
    > + .fb_cursor = sm501fb_cursor,
    > + .fb_fillrect = cfb_fillrect,
    > + .fb_copyarea = cfb_copyarea,
    > + .fb_imageblit = cfb_imageblit,
    > +};
    > +
    > +/* sm501fb_info_alloc
    > + *
    > + * creates and initialises an sm501fb_info structure
    > +*/
    > +
    > +static struct sm501fb_info *sm501fb_info_alloc(struct fb_info *fbinfo_crt,
    > + struct fb_info *fbinfo_pnl)
    > +{
    > + struct sm501fb_info *info;
    > + struct sm501fb_par *par;
    > +
    > + info = kzalloc(sizeof(struct sm501fb_info), GFP_KERNEL);
    > + if (info) {
    > + /* set the references back */
    > +
    > + par = fbinfo_crt->par;
    > + par->info = info;
    > + par->head = HEAD_CRT;
    > + fbinfo_crt->pseudo_palette = &par->pseudo_palette;
    > +
    > + par = fbinfo_pnl->par;
    > + par->info = info;
    > + par->head = HEAD_PANEL;
    > + fbinfo_pnl->pseudo_palette = &par->pseudo_palette;
    > +
    > + /* store the two fbs into our info */
    > + info->fb[HEAD_CRT] = fbinfo_crt;
    > + info->fb[HEAD_PANEL] = fbinfo_pnl;
    > + }
    > +
    > + return info;
    > +}
    > +
    > +/* sm501_init_cursor
    > + *
    > + * initialise hw cursor parameters
    > +*/
    > +
    > +int sm501_init_cursor(struct fb_info *fbi, unsigned int reg_base)
    > +{
    > + struct sm501fb_par *par = fbi->par;
    > + struct sm501fb_info *info = par->info;
    > + int ret;
    > +
    > + par->cursor_regs = info->regs + reg_base;
    > +
    > + ret = sm501_alloc_mem(info, &par->cursor, SM501_MEMF_CURSOR, 1024);
    > + if (ret < 0)
    > + return ret;
    > +
    > + /* initialise the colour registers */
    > +
    > + writel(par->cursor.sm_addr, par->cursor_regs + SM501_OFF_HWC_ADDR);
    > +
    > + writel(0x00, par->cursor_regs + SM501_OFF_HWC_LOC);
    > + writel(0x00, par->cursor_regs + SM501_OFF_HWC_COLOR_1_2);
    > + writel(0x00, par->cursor_regs + SM501_OFF_HWC_COLOR_3);
    > + sm501fb_sync_regs(info);
    > +
    > + return 0;
    > +}
    > +
    > +/* sm501fb_info_start
    > + *
    > + * fills the par structure claiming resources and remapping etc.
    > +*/
    > +
    > +static int sm501fb_start(struct sm501fb_info *info,
    > + struct platform_device *pdev)
    > +{
    > + struct resource *res;
    > + struct device *dev;
    > + int ret;
    > +
    > + info->dev = dev = &pdev->dev;
    > + platform_set_drvdata(pdev, info);
    > +
    > + info->irq = ret = platform_get_irq(pdev, 0);
    > + if (ret < 0) {
    > + /* we currently do not use the IRQ */
    > + dev_warn(dev, "no irq for device\n");
    > + }
    > +
    > + /* allocate, reserve and remap resources for registers */
    > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    > + if (res == NULL) {
    > + dev_err(dev, "no resource definition for registers\n");
    > + ret = -ENOENT;
    > + goto err_release;
    > + }
    > +
    > + info->regs_res = request_mem_region(res->start,
    > + res->end - res->start,
    > + pdev->name);
    > +
    > + if (info->regs_res == NULL) {
    > + dev_err(dev, "cannot claim registers\n");
    > + ret = -ENXIO;
    > + goto err_release;
    > + }
    > +
    > + info->regs = ioremap(res->start, (res->end - res->start)+1);
    > + if (info->regs == NULL) {
    > + dev_err(dev, "cannot remap registers\n");
    > + ret = -ENXIO;
    > + goto err_regs_res;
    > + }
    > +
    > + /* allocate, reserve resources for framebuffer */
    > + res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
    > + if (res == NULL) {
    > + dev_err(dev, "no memory resource defined\n");
    > + ret = -ENXIO;
    > + goto err_regs_map;
    > + }
    > +
    > + info->fbmem_res = request_mem_region(res->start,
    > + (res->end - res->start)+1,
    > + pdev->name);
    > + if (info->fbmem_res == NULL) {
    > + dev_err(dev, "cannot claim framebuffer\n");
    > + ret = -ENXIO;
    > + goto err_regs_map;
    > + }
    > +
    > + info->fbmem = ioremap(res->start, (res->end - res->start)+1);
    > + if (info->fbmem == NULL) {
    > + dev_err(dev, "cannot remap framebuffer\n");
    > + goto err_mem_res;
    > + }
    > +
    > + info->fbmem_len = (res->end - res->start)+1;
    > +
    > + /* enable display controller */
    > + sm501_unit_power(dev->parent, SM501_GATE_DISPLAY, 1);
    > +
    > + /* setup cursors */
    > +
    > + sm501_init_cursor(info->fb[HEAD_CRT], SM501_DC_CRT_HWC_ADDR);
    > + sm501_init_cursor(info->fb[HEAD_PANEL], SM501_DC_PANEL_HWC_ADDR);
    > +
    > + return 0; /* everything is setup */
    > +
    > + err_mem_res:
    > + release_resource(info->fbmem_res);
    > + kfree(info->fbmem_res);
    > +
    > + err_regs_map:
    > + iounmap(info->regs);
    > +
    > + err_regs_res:
    > + release_resource(info->regs_res);
    > + kfree(info->regs_res);
    > +
    > + err_release:
    > + return ret;
    > +}
    > +
    > +static void sm501fb_stop(struct sm501fb_info *info)
    > +{
    > + /* disable display controller */
    > + sm501_unit_power(info->dev->parent, SM501_GATE_DISPLAY, 0);
    > +
    > + iounmap(info->fbmem);
    > + release_resource(info->fbmem_res);
    > + kfree(info->fbmem_res);
    > +
    > + iounmap(info->regs);
    > + release_resource(info->regs_res);
    > + kfree(info->regs_res);
    > +}
    > +
    > +static void sm501fb_info_release(struct sm501fb_info *info)
    > +{
    > + kfree(info);
    > +}
    > +
    > +static int sm501fb_init_fb(struct fb_info *fb,
    > + enum sm501_controller head,
    > + const char *fbname)
    > +{
    > + struct sm501_platdata_fbsub *pd;
    > + struct sm501fb_par *par = fb->par;
    > + struct sm501fb_info *info = par->info;
    > + unsigned long ctrl;
    > + unsigned int enable;
    > + int ret;
    > +
    > + switch (head) {
    > + case HEAD_CRT:
    > + pd = info->pdata->fb_crt;
    > + ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
    > + enable = (ctrl & SM501_DC_CRT_CONTROL_ENABLE) ? 1 : 0;
    > +
    > + /* ensure we set the correct source register */
    > + if (info->pdata->fb_route != SM501_FB_CRT_PANEL) {
    > + ctrl |= SM501_DC_CRT_CONTROL_SEL;
    > + writel(ctrl, info->regs + SM501_DC_CRT_CONTROL);
    > + }
    > +
    > + break;
    > +
    > + case HEAD_PANEL:
    > + pd = info->pdata->fb_pnl;
    > + ctrl = readl(info->regs + SM501_DC_PANEL_CONTROL);
    > + enable = (ctrl & SM501_DC_PANEL_CONTROL_EN) ? 1 : 0;
    > + break;
    > +
    > + default:
    > + pd = NULL; /* stop compiler warnings */
    > + ctrl = 0;
    > + enable = 0;
    > + BUG();
    > + }
    > +
    > + dev_info(info->dev, "fb %s %sabled at start\n",
    > + fbname, enable ? "en" : "dis");
    > +
    > + /* check to see if our routing allows this */
    > +
    > + if (head == HEAD_CRT && info->pdata->fb_route == SM501_FB_CRT_PANEL) {
    > + ctrl &= ~SM501_DC_CRT_CONTROL_SEL;
    > + writel(ctrl, info->regs + SM501_DC_CRT_CONTROL);
    > + enable = 0;
    > + }
    > +
    > + strlcpy(fb->fix.id, fbname, sizeof(fb->fix.id));
    > +
    > + memcpy(&par->ops,
    > + (head == HEAD_CRT) ? &sm501fb_ops_crt : &sm501fb_ops_pnl,
    > + sizeof(struct fb_ops));
    > +
    > + /* update ops dependant on what we've been passed */
    > +
    > + if ((pd->flags & SM501FB_FLAG_USE_HWCURSOR) == 0)
    > + par->ops.fb_cursor = NULL;
    > +
    > + fb->fbops = &par->ops;
    > + fb->flags = FBINFO_FLAG_DEFAULT |
    > + FBINFO_HWACCEL_XPAN | FBINFO_HWACCEL_YPAN;
    > +
    > + /* fixed data */
    > +
    > + fb->fix.type = FB_TYPE_PACKED_PIXELS;
    > + fb->fix.type_aux = 0;
    > + fb->fix.xpanstep = 1;
    > + fb->fix.ypanstep = 1;
    > + fb->fix.ywrapstep = 0;
    > + fb->fix.accel = FB_ACCEL_NONE;
    > +
    > + /* screenmode */
    > +
    > + fb->var.nonstd = 0;
    > + fb->var.activate = FB_ACTIVATE_NOW;
    > + fb->var.accel_flags = 0;
    > + fb->var.vmode = FB_VMODE_NONINTERLACED;
    > + fb->var.bits_per_pixel = 16;
    > +
    > + if (enable && (pd->flags & SM501FB_FLAG_USE_INIT_MODE) && 0) {
    > + /* TODO read the mode from the current display */
    > +
    > + } else {
    > + if (pd->def_mode) {
    > + dev_info(info->dev, "using supplied mode\n");
    > + fb_videomode_to_var(&fb->var, pd->def_mode);
    > +
    > + fb->var.bits_per_pixel = pd->def_bpp ? pd->def_bpp : 8;
    > + fb->var.xres_virtual = fb->var.xres;
    > + fb->var.yres_virtual = fb->var.yres;
    > + } else {
    > + ret = fb_find_mode(&fb->var, fb,
    > + NULL, NULL, 0, NULL, 8);
    > +
    > + if (ret == 0 || ret == 4) {
    > + dev_err(info->dev,
    > + "failed to get initial mode\n");
    > + return -EINVAL;
    > + }
    > + }
    > + }
    > +
    > + /* initialise and set the palette */
    > + fb_alloc_cmap(&fb->cmap, NR_PALETTE, 0);
    > + fb_set_cmap(&fb->cmap, fb);
    > +
    > + ret = (fb->fbops->fb_check_var)(&fb->var, fb);
    > + if (ret)
    > + dev_err(info->dev, "check_var() failed on initial setup?\n");
    > +
    > + /* ensure we've activated our new configuration */
    > + (fb->fbops->fb_set_par)(fb);
    > +
    > + return 0;
    > +}
    > +
    > +/* default platform data if none is supplied (ie, PCI device) */
    > +
    > +static struct sm501_platdata_fbsub sm501fb_pdata_crt = {
    > + .flags = (SM501FB_FLAG_USE_INIT_MODE |
    > + SM501FB_FLAG_USE_HWCURSOR |
    > + SM501FB_FLAG_USE_HWACCEL |
    > + SM501FB_FLAG_DISABLE_AT_EXIT),
    > +
    > +};
    > +
    > +static struct sm501_platdata_fbsub sm501fb_pdata_pnl = {
    > + .flags = (SM501FB_FLAG_USE_INIT_MODE |
    > + SM501FB_FLAG_USE_HWCURSOR |
    > + SM501FB_FLAG_USE_HWACCEL |
    > + SM501FB_FLAG_DISABLE_AT_EXIT),
    > +};
    > +
    > +static struct sm501_platdata_fb sm501fb_def_pdata = {
    > + .fb_route = SM501_FB_OWN,
    > + .fb_crt = &sm501fb_pdata_crt,
    > + .fb_pnl = &sm501fb_pdata_pnl,
    > +};
    > +
    > +static char driver_name_crt[] = "sm501fb-crt";
    > +static char driver_name_pnl[] = "sm501fb-panel";
    > +
    > +static int __init sm501fb_probe(struct platform_device *pdev)
    > +{
    > + struct sm501fb_info *info;
    > + struct device *dev = &pdev->dev;
    > + struct fb_info *fbinfo_crt;
    > + struct fb_info *fbinfo_pnl;
    > + int ret;
    > +
    > + /* allocate our framebuffers */
    > +
    > + fbinfo_crt = framebuffer_alloc(sizeof(struct sm501fb_par), dev);
    > + if (fbinfo_crt == NULL) {
    > + dev_err(dev, "cannot allocate crt framebuffer\n");
    > + return -ENOMEM;
    > + }
    > +
    > + fbinfo_pnl = framebuffer_alloc(sizeof(struct sm501fb_par), dev);
    > + if (fbinfo_pnl == NULL) {
    > + dev_err(dev, "cannot allocate panel framebuffer\n");
    > + ret = -ENOMEM;
    > + goto fbinfo_crt_alloc_fail;
    > + }
    > +
    > + info = sm501fb_info_alloc(fbinfo_crt, fbinfo_pnl);
    > + if (info == NULL) {
    > + dev_err(dev, "cannot allocate par\n");
    > + ret = -ENOMEM;
    > + goto sm501fb_alloc_fail;
    > + }
    > +
    > + if (dev->parent->platform_data) {
    > + struct sm501_platdata *pd = dev->parent->platform_data;
    > + info->pdata = pd->fb;
    > + }
    > +
    > + if (info->pdata == NULL) {
    > + dev_info(dev, "using default configuration data\n");
    > + info->pdata = &sm501fb_def_pdata;
    > + }
    > +
    > + /* start the framebuffers */
    > +
    > + ret = sm501fb_start(info, pdev);
    > + if (ret) {
    > + dev_err(dev, "cannot initialise SM501\n");
    > + goto sm501fb_start_fail;
    > + }
    > +
    > + /* CRT framebuffer setup */
    > +
    > + ret = sm501fb_init_fb(fbinfo_crt, HEAD_CRT, driver_name_crt);
    > + if (ret) {
    > + dev_err(dev, "cannot initialise CRT fb\n");
    > + goto sm501fb_start_fail;
    > + }
    > +
    > + /* Panel framebuffer setup */
    > +
    > + ret = sm501fb_init_fb(fbinfo_pnl, HEAD_PANEL, driver_name_pnl);
    > + if (ret) {
    > + dev_err(dev, "cannot initialise Panel fb\n");
    > + goto sm501fb_start_fail;
    > + }
    > +
    > + /* register framebuffers */
    > +
    > + ret = register_framebuffer(fbinfo_crt);
    > + if (ret < 0) {
    > + dev_err(dev, "failed to register CRT fb (%d)\n", ret);
    > + goto register_crt_fail;
    > + }
    > +
    > + ret = register_framebuffer(fbinfo_pnl);
    > + if (ret < 0) {
    > + dev_err(dev, "failed to register panel fb (%d)\n", ret);
    > + goto register_pnl_fail;
    > + }
    > +
    > + dev_info(dev, "fb%d: %s frame buffer device\n",
    > + fbinfo_crt->node, fbinfo_crt->fix.id);
    > +
    > + dev_info(dev, "fb%d: %s frame buffer device\n",
    > + fbinfo_pnl->node, fbinfo_pnl->fix.id);
    > +
    > + /* create device files */
    > +
    > + ret = device_create_file(dev, &dev_attr_crt_src);
    > + if (ret)
    > + goto crtsrc_fail;
    > +
    > + ret = device_create_file(dev, &dev_attr_fbregs_pnl);
    > + if (ret)
    > + goto fbregs_pnl_fail;
    > +
    > + ret = device_create_file(dev, &dev_attr_fbregs_crt);
    > + if (ret)
    > + goto fbregs_crt_fail;
    > +
    > + /* we registered, return ok */
    > + return 0;
    > +
    > + fbregs_crt_fail:
    > + device_remove_file(dev, &dev_attr_fbregs_pnl);
    > +
    > + fbregs_pnl_fail:
    > + device_remove_file(dev, &dev_attr_crt_src);
    > +
    > + crtsrc_fail:
    > + unregister_framebuffer(fbinfo_pnl);
    > +
    > + register_pnl_fail:
    > + unregister_framebuffer(fbinfo_crt);
    > +
    > + register_crt_fail:
    > + sm501fb_stop(info);
    > +
    > + sm501fb_start_fail:
    > + sm501fb_info_release(info);
    > +
    > + sm501fb_alloc_fail:
    > + framebuffer_release(fbinfo_pnl);
    > +
    > + fbinfo_crt_alloc_fail:
    > + framebuffer_release(fbinfo_crt);
    > +
    > + return ret;
    > +}
    > +
    > +
    > +/*
    > + * Cleanup
    > + */
    > +static int sm501fb_remove(struct platform_device *pdev)
    > +{
    > + struct sm501fb_info *info = platform_get_drvdata(pdev);
    > + struct fb_info *fbinfo_crt = info->fb[0];
    > + struct fb_info *fbinfo_pnl = info->fb[1];
    > +
    > + device_remove_file(&pdev->dev, &dev_attr_fbregs_crt);
    > + device_remove_file(&pdev->dev, &dev_attr_fbregs_pnl);
    > + device_remove_file(&pdev->dev, &dev_attr_crt_src);
    > +
    > + unregister_framebuffer(fbinfo_crt);
    > + unregister_framebuffer(fbinfo_pnl);
    > +
    > + sm501fb_stop(info);
    > + sm501fb_info_release(info);
    > +
    > + framebuffer_release(fbinfo_pnl);
    > + framebuffer_release(fbinfo_crt);
    > +
    > + return 0;
    > +}
    > +
    > +#ifdef CONFIG_PM
    > +
    > +static int sm501fb_suspend_fb(struct sm501fb_info *info,
    > + enum sm501_controller head)
    > +{
    > + struct fb_info *fbi = info->fb[head];
    > + struct sm501fb_par *par = fbi->par;
    > +
    > + if (par->screen.size == 0)
    > + return 0;
    > +
    > + /* backup copies in case chip is powered down over suspend */
    > +
    > + par->store_fb = vmalloc(par->screen.size);
    > + if (par->store_fb == NULL) {
    > + dev_err(info->dev, "no memory to store screen\n");
    > + return -ENOMEM;
    > + }
    > +
    > + par->store_cursor = vmalloc(par->cursor.size);
    > + if (par->store_cursor == NULL) {
    > + dev_err(info->dev, "no memory to store cursor\n");
    > + goto err_nocursor;
    > + }
    > +
    > + memcpy_fromio(par->store_fb, par->screen.k_addr, par->screen.size);
    > + memcpy_fromio(par->store_cursor, par->cursor.k_addr, par->cursor.size);
    > +
    > + /* blank the relevant interface to ensure unit power minimised */
    > + (par->ops.fb_blank)(FB_BLANK_POWERDOWN, fbi);
    > +
    > + return 0;
    > +
    > + err_nocursor:
    > + vfree(par->store_fb);
    > +
    > + return -ENOMEM;
    > +
    > +}
    > +
    > +static void sm501fb_resume_fb(struct sm501fb_info *info,
    > + enum sm501_controller head)
    > +{
    > + struct fb_info *fbi = info->fb[head];
    > + struct sm501fb_par *par = fbi->par;
    > +
    > + if (par->screen.size == 0)
    > + return;
    > +
    > + /* re-activate the configuration */
    > +
    > + (par->ops.fb_set_par)(fbi);
    > +
    > + /* restore the data */
    > +
    > + memcpy_toio(par->screen.k_addr, par->store_fb, par->screen.size);
    > + memcpy_toio(par->cursor.k_addr, par->store_cursor, par->cursor.size);
    > +
    > + vfree(par->store_fb);
    > + vfree(par->store_cursor);
    > +}
    > +
    > +
    > +/* suspend and resume support */
    > +
    > +static int sm501fb_suspend(struct platform_device *pdev, pm_message_t state)
    > +{
    > + struct sm501fb_info *info = platform_get_drvdata(pdev);
    > +
    > + sm501fb_suspend_fb(info, HEAD_CRT);
    > + sm501fb_suspend_fb(info, HEAD_PANEL);
    > +
    > + /* turn off the clocks, in case the device is not powered down */
    > + sm501_unit_power(info->dev->parent, SM501_GATE_DISPLAY, 0);
    > +
    > + return 0;
    > +}
    > +
    > +static int sm501fb_resume(struct platform_device *pdev)
    > +{
    > + struct sm501fb_info *info = platform_get_drvdata(pdev);
    > +
    > + sm501_unit_power(info->dev->parent, SM501_GATE_DISPLAY, 1);
    > +
    > + sm501fb_resume_fb(info, HEAD_CRT);
    > + sm501fb_resume_fb(info, HEAD_PANEL);
    > +
    > + return 0;
    > +}
    > +
    > +#else
    > +#define sm501fb_suspend NULL
    > +#define sm501fb_resume NULL
    > +#endif
    > +
    > +static struct platform_driver sm501fb_driver = {
    > + .probe = sm501fb_probe,
    > + .remove = sm501fb_remove,
    > + .suspend = sm501fb_suspend,
    > + .resume = sm501fb_resume,
    > + .driver = {
    > + .name = "sm501-fb",
    > + .owner = THIS_MODULE,
    > + },
    > +};
    > +
    > +int __devinit sm501fb_init(void)
    > +{
    > + return platform_driver_register(&sm501fb_driver);
    > +}
    > +
    > +static void __exit sm501fb_cleanup(void)
    > +{
    > + platform_driver_unregister(&sm501fb_driver);
    > +}
    > +
    > +module_init(sm501fb_init);
    > +module_exit(sm501fb_cleanup);
    > +
    > +MODULE_AUTHOR("Ben Dooks, Vincent Sanders");
    > +MODULE_DESCRIPTION("SM501 Framebuffer driver");
    > +MODULE_LICENSE("GPL v2");
    >
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