![Jingoo Han](/assets/img/avatar_default.png)
The driver core clears the driver data to NULL after device_release
or on probe failure, since commit 0998d06310
(device-core: Ensure drvdata = NULL when no driver is bound).
Thus, it is not needed to manually clear the device driver data to NULL.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Cc: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
592 lines
14 KiB
C
592 lines
14 KiB
C
/*
|
|
* SH7760/SH7763 LCDC Framebuffer driver.
|
|
*
|
|
* (c) 2006-2008 MSC Vertriebsges.m.b.H.,
|
|
* Manuel Lauss <mano@roarinelk.homelinux.net>
|
|
* (c) 2008 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
|
|
*
|
|
* 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.
|
|
*
|
|
* PLEASE HAVE A LOOK AT Documentation/fb/sh7760fb.txt!
|
|
*
|
|
* Thanks to Siegfried Schaefer <s.schaefer at schaefer-edv.de>
|
|
* for his original source and testing!
|
|
*
|
|
* sh7760_setcolreg get from drivers/video/sh_mobile_lcdcfb.c
|
|
*/
|
|
|
|
#include <linux/completion.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/fb.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <asm/sh7760fb.h>
|
|
|
|
struct sh7760fb_par {
|
|
void __iomem *base;
|
|
int irq;
|
|
|
|
struct sh7760fb_platdata *pd; /* display information */
|
|
|
|
dma_addr_t fbdma; /* physical address */
|
|
|
|
int rot; /* rotation enabled? */
|
|
|
|
u32 pseudo_palette[16];
|
|
|
|
struct platform_device *dev;
|
|
struct resource *ioarea;
|
|
struct completion vsync; /* vsync irq event */
|
|
};
|
|
|
|
static irqreturn_t sh7760fb_irq(int irq, void *data)
|
|
{
|
|
struct completion *c = data;
|
|
|
|
complete(c);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/* wait_for_lps - wait until power supply has reached a certain state. */
|
|
static int wait_for_lps(struct sh7760fb_par *par, int val)
|
|
{
|
|
int i = 100;
|
|
while (--i && ((ioread16(par->base + LDPMMR) & 3) != val))
|
|
msleep(1);
|
|
|
|
if (i <= 0)
|
|
return -ETIMEDOUT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* en/disable the LCDC */
|
|
static int sh7760fb_blank(int blank, struct fb_info *info)
|
|
{
|
|
struct sh7760fb_par *par = info->par;
|
|
struct sh7760fb_platdata *pd = par->pd;
|
|
unsigned short cntr = ioread16(par->base + LDCNTR);
|
|
unsigned short intr = ioread16(par->base + LDINTR);
|
|
int lps;
|
|
|
|
if (blank == FB_BLANK_UNBLANK) {
|
|
intr |= VINT_START;
|
|
cntr = LDCNTR_DON2 | LDCNTR_DON;
|
|
lps = 3;
|
|
} else {
|
|
intr &= ~VINT_START;
|
|
cntr = LDCNTR_DON2;
|
|
lps = 0;
|
|
}
|
|
|
|
if (pd->blank)
|
|
pd->blank(blank);
|
|
|
|
iowrite16(intr, par->base + LDINTR);
|
|
iowrite16(cntr, par->base + LDCNTR);
|
|
|
|
return wait_for_lps(par, lps);
|
|
}
|
|
|
|
static int sh7760_setcolreg (u_int regno,
|
|
u_int red, u_int green, u_int blue,
|
|
u_int transp, struct fb_info *info)
|
|
{
|
|
u32 *palette = info->pseudo_palette;
|
|
|
|
if (regno >= 16)
|
|
return -EINVAL;
|
|
|
|
/* only FB_VISUAL_TRUECOLOR supported */
|
|
|
|
red >>= 16 - info->var.red.length;
|
|
green >>= 16 - info->var.green.length;
|
|
blue >>= 16 - info->var.blue.length;
|
|
transp >>= 16 - info->var.transp.length;
|
|
|
|
palette[regno] = (red << info->var.red.offset) |
|
|
(green << info->var.green.offset) |
|
|
(blue << info->var.blue.offset) |
|
|
(transp << info->var.transp.offset);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sh7760fb_get_color_info(struct device *dev,
|
|
u16 lddfr, int *bpp, int *gray)
|
|
{
|
|
int lbpp, lgray;
|
|
|
|
lgray = lbpp = 0;
|
|
|
|
switch (lddfr & LDDFR_COLOR_MASK) {
|
|
case LDDFR_1BPP_MONO:
|
|
lgray = 1;
|
|
lbpp = 1;
|
|
break;
|
|
case LDDFR_2BPP_MONO:
|
|
lgray = 1;
|
|
lbpp = 2;
|
|
break;
|
|
case LDDFR_4BPP_MONO:
|
|
lgray = 1;
|
|
case LDDFR_4BPP:
|
|
lbpp = 4;
|
|
break;
|
|
case LDDFR_6BPP_MONO:
|
|
lgray = 1;
|
|
case LDDFR_8BPP:
|
|
lbpp = 8;
|
|
break;
|
|
case LDDFR_16BPP_RGB555:
|
|
case LDDFR_16BPP_RGB565:
|
|
lbpp = 16;
|
|
lgray = 0;
|
|
break;
|
|
default:
|
|
dev_dbg(dev, "unsupported LDDFR bit depth.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (bpp)
|
|
*bpp = lbpp;
|
|
if (gray)
|
|
*gray = lgray;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sh7760fb_check_var(struct fb_var_screeninfo *var,
|
|
struct fb_info *info)
|
|
{
|
|
struct fb_fix_screeninfo *fix = &info->fix;
|
|
struct sh7760fb_par *par = info->par;
|
|
int ret, bpp;
|
|
|
|
/* get color info from register value */
|
|
ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
var->bits_per_pixel = bpp;
|
|
|
|
if ((var->grayscale) && (var->bits_per_pixel == 1))
|
|
fix->visual = FB_VISUAL_MONO10;
|
|
else if (var->bits_per_pixel >= 15)
|
|
fix->visual = FB_VISUAL_TRUECOLOR;
|
|
else
|
|
fix->visual = FB_VISUAL_PSEUDOCOLOR;
|
|
|
|
/* TODO: add some more validation here */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* sh7760fb_set_par - set videomode.
|
|
*
|
|
* NOTE: The rotation, grayscale and DSTN codepaths are
|
|
* totally untested!
|
|
*/
|
|
static int sh7760fb_set_par(struct fb_info *info)
|
|
{
|
|
struct sh7760fb_par *par = info->par;
|
|
struct fb_videomode *vm = par->pd->def_mode;
|
|
unsigned long sbase, dstn_off, ldsarl, stride;
|
|
unsigned short hsynp, hsynw, htcn, hdcn;
|
|
unsigned short vsynp, vsynw, vtln, vdln;
|
|
unsigned short lddfr, ldmtr;
|
|
int ret, bpp, gray;
|
|
|
|
par->rot = par->pd->rotate;
|
|
|
|
/* rotate only works with xres <= 320 */
|
|
if (par->rot && (vm->xres > 320)) {
|
|
dev_dbg(info->dev, "rotation disabled due to display size\n");
|
|
par->rot = 0;
|
|
}
|
|
|
|
/* calculate LCDC reg vals from display parameters */
|
|
hsynp = vm->right_margin + vm->xres;
|
|
hsynw = vm->hsync_len;
|
|
htcn = vm->left_margin + hsynp + hsynw;
|
|
hdcn = vm->xres;
|
|
vsynp = vm->lower_margin + vm->yres;
|
|
vsynw = vm->vsync_len;
|
|
vtln = vm->upper_margin + vsynp + vsynw;
|
|
vdln = vm->yres;
|
|
|
|
/* get color info from register value */
|
|
ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, &gray);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dev_dbg(info->dev, "%dx%d %dbpp %s (orientation %s)\n", hdcn,
|
|
vdln, bpp, gray ? "grayscale" : "color",
|
|
par->rot ? "rotated" : "normal");
|
|
|
|
#ifdef CONFIG_CPU_LITTLE_ENDIAN
|
|
lddfr = par->pd->lddfr | (1 << 8);
|
|
#else
|
|
lddfr = par->pd->lddfr & ~(1 << 8);
|
|
#endif
|
|
|
|
ldmtr = par->pd->ldmtr;
|
|
|
|
if (!(vm->sync & FB_SYNC_HOR_HIGH_ACT))
|
|
ldmtr |= LDMTR_CL1POL;
|
|
if (!(vm->sync & FB_SYNC_VERT_HIGH_ACT))
|
|
ldmtr |= LDMTR_FLMPOL;
|
|
|
|
/* shut down LCDC before changing display parameters */
|
|
sh7760fb_blank(FB_BLANK_POWERDOWN, info);
|
|
|
|
iowrite16(par->pd->ldickr, par->base + LDICKR); /* pixclock */
|
|
iowrite16(ldmtr, par->base + LDMTR); /* polarities */
|
|
iowrite16(lddfr, par->base + LDDFR); /* color/depth */
|
|
iowrite16((par->rot ? 1 << 13 : 0), par->base + LDSMR); /* rotate */
|
|
iowrite16(par->pd->ldpmmr, par->base + LDPMMR); /* Power Management */
|
|
iowrite16(par->pd->ldpspr, par->base + LDPSPR); /* Power Supply Ctrl */
|
|
|
|
/* display resolution */
|
|
iowrite16(((htcn >> 3) - 1) | (((hdcn >> 3) - 1) << 8),
|
|
par->base + LDHCNR);
|
|
iowrite16(vdln - 1, par->base + LDVDLNR);
|
|
iowrite16(vtln - 1, par->base + LDVTLNR);
|
|
/* h/v sync signals */
|
|
iowrite16((vsynp - 1) | ((vsynw - 1) << 12), par->base + LDVSYNR);
|
|
iowrite16(((hsynp >> 3) - 1) | (((hsynw >> 3) - 1) << 12),
|
|
par->base + LDHSYNR);
|
|
/* AC modulation sig */
|
|
iowrite16(par->pd->ldaclnr, par->base + LDACLNR);
|
|
|
|
stride = (par->rot) ? vtln : hdcn;
|
|
if (!gray)
|
|
stride *= (bpp + 7) >> 3;
|
|
else {
|
|
if (bpp == 1)
|
|
stride >>= 3;
|
|
else if (bpp == 2)
|
|
stride >>= 2;
|
|
else if (bpp == 4)
|
|
stride >>= 1;
|
|
/* 6 bpp == 8 bpp */
|
|
}
|
|
|
|
/* if rotated, stride must be power of 2 */
|
|
if (par->rot) {
|
|
unsigned long bit = 1 << 31;
|
|
while (bit) {
|
|
if (stride & bit)
|
|
break;
|
|
bit >>= 1;
|
|
}
|
|
if (stride & ~bit)
|
|
stride = bit << 1; /* not P-o-2, round up */
|
|
}
|
|
iowrite16(stride, par->base + LDLAOR);
|
|
|
|
/* set display mem start address */
|
|
sbase = (unsigned long)par->fbdma;
|
|
if (par->rot)
|
|
sbase += (hdcn - 1) * stride;
|
|
|
|
iowrite32(sbase, par->base + LDSARU);
|
|
|
|
/*
|
|
* for DSTN need to set address for lower half.
|
|
* I (mlau) don't know which address to set it to,
|
|
* so I guessed at (stride * yres/2).
|
|
*/
|
|
if (((ldmtr & 0x003f) >= LDMTR_DSTN_MONO_8) &&
|
|
((ldmtr & 0x003f) <= LDMTR_DSTN_COLOR_16)) {
|
|
|
|
dev_dbg(info->dev, " ***** DSTN untested! *****\n");
|
|
|
|
dstn_off = stride;
|
|
if (par->rot)
|
|
dstn_off *= hdcn >> 1;
|
|
else
|
|
dstn_off *= vdln >> 1;
|
|
|
|
ldsarl = sbase + dstn_off;
|
|
} else
|
|
ldsarl = 0;
|
|
|
|
iowrite32(ldsarl, par->base + LDSARL); /* mem for lower half of DSTN */
|
|
|
|
info->fix.line_length = stride;
|
|
|
|
sh7760fb_check_var(&info->var, info);
|
|
|
|
sh7760fb_blank(FB_BLANK_UNBLANK, info); /* panel on! */
|
|
|
|
dev_dbg(info->dev, "hdcn : %6d htcn : %6d\n", hdcn, htcn);
|
|
dev_dbg(info->dev, "hsynw : %6d hsynp : %6d\n", hsynw, hsynp);
|
|
dev_dbg(info->dev, "vdln : %6d vtln : %6d\n", vdln, vtln);
|
|
dev_dbg(info->dev, "vsynw : %6d vsynp : %6d\n", vsynw, vsynp);
|
|
dev_dbg(info->dev, "clksrc: %6d clkdiv: %6d\n",
|
|
(par->pd->ldickr >> 12) & 3, par->pd->ldickr & 0x1f);
|
|
dev_dbg(info->dev, "ldpmmr: 0x%04x ldpspr: 0x%04x\n", par->pd->ldpmmr,
|
|
par->pd->ldpspr);
|
|
dev_dbg(info->dev, "ldmtr : 0x%04x lddfr : 0x%04x\n", ldmtr, lddfr);
|
|
dev_dbg(info->dev, "ldlaor: %ld\n", stride);
|
|
dev_dbg(info->dev, "ldsaru: 0x%08lx ldsarl: 0x%08lx\n", sbase, ldsarl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct fb_ops sh7760fb_ops = {
|
|
.owner = THIS_MODULE,
|
|
.fb_blank = sh7760fb_blank,
|
|
.fb_check_var = sh7760fb_check_var,
|
|
.fb_setcolreg = sh7760_setcolreg,
|
|
.fb_set_par = sh7760fb_set_par,
|
|
.fb_fillrect = cfb_fillrect,
|
|
.fb_copyarea = cfb_copyarea,
|
|
.fb_imageblit = cfb_imageblit,
|
|
};
|
|
|
|
static void sh7760fb_free_mem(struct fb_info *info)
|
|
{
|
|
struct sh7760fb_par *par = info->par;
|
|
|
|
if (!info->screen_base)
|
|
return;
|
|
|
|
dma_free_coherent(info->dev, info->screen_size,
|
|
info->screen_base, par->fbdma);
|
|
|
|
par->fbdma = 0;
|
|
info->screen_base = NULL;
|
|
info->screen_size = 0;
|
|
}
|
|
|
|
/* allocate the framebuffer memory. This memory must be in Area3,
|
|
* (dictated by the DMA engine) and contiguous, at a 512 byte boundary.
|
|
*/
|
|
static int sh7760fb_alloc_mem(struct fb_info *info)
|
|
{
|
|
struct sh7760fb_par *par = info->par;
|
|
void *fbmem;
|
|
unsigned long vram;
|
|
int ret, bpp;
|
|
|
|
if (info->screen_base)
|
|
return 0;
|
|
|
|
/* get color info from register value */
|
|
ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
|
|
if (ret) {
|
|
printk(KERN_ERR "colinfo\n");
|
|
return ret;
|
|
}
|
|
|
|
/* min VRAM: xres_min = 16, yres_min = 1, bpp = 1: 2byte -> 1 page
|
|
max VRAM: xres_max = 1024, yres_max = 1024, bpp = 16: 2MB */
|
|
|
|
vram = info->var.xres * info->var.yres;
|
|
if (info->var.grayscale) {
|
|
if (bpp == 1)
|
|
vram >>= 3;
|
|
else if (bpp == 2)
|
|
vram >>= 2;
|
|
else if (bpp == 4)
|
|
vram >>= 1;
|
|
} else if (bpp > 8)
|
|
vram *= 2;
|
|
if ((vram < 1) || (vram > 1024 * 2048)) {
|
|
dev_dbg(info->dev, "too much VRAM required. Check settings\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (vram < PAGE_SIZE)
|
|
vram = PAGE_SIZE;
|
|
|
|
fbmem = dma_alloc_coherent(info->dev, vram, &par->fbdma, GFP_KERNEL);
|
|
|
|
if (!fbmem)
|
|
return -ENOMEM;
|
|
|
|
if ((par->fbdma & SH7760FB_DMA_MASK) != SH7760FB_DMA_MASK) {
|
|
sh7760fb_free_mem(info);
|
|
dev_err(info->dev, "kernel gave me memory at 0x%08lx, which is"
|
|
"unusable for the LCDC\n", (unsigned long)par->fbdma);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
info->screen_base = fbmem;
|
|
info->screen_size = vram;
|
|
info->fix.smem_start = (unsigned long)info->screen_base;
|
|
info->fix.smem_len = info->screen_size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sh7760fb_probe(struct platform_device *pdev)
|
|
{
|
|
struct fb_info *info;
|
|
struct resource *res;
|
|
struct sh7760fb_par *par;
|
|
int ret;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (unlikely(res == NULL)) {
|
|
dev_err(&pdev->dev, "invalid resource\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
info = framebuffer_alloc(sizeof(struct sh7760fb_par), &pdev->dev);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
par = info->par;
|
|
par->dev = pdev;
|
|
|
|
par->pd = pdev->dev.platform_data;
|
|
if (!par->pd) {
|
|
dev_dbg(info->dev, "no display setup data!\n");
|
|
ret = -ENODEV;
|
|
goto out_fb;
|
|
}
|
|
|
|
par->ioarea = request_mem_region(res->start,
|
|
resource_size(res), pdev->name);
|
|
if (!par->ioarea) {
|
|
dev_err(&pdev->dev, "mmio area busy\n");
|
|
ret = -EBUSY;
|
|
goto out_fb;
|
|
}
|
|
|
|
par->base = ioremap_nocache(res->start, resource_size(res));
|
|
if (!par->base) {
|
|
dev_err(&pdev->dev, "cannot remap\n");
|
|
ret = -ENODEV;
|
|
goto out_res;
|
|
}
|
|
|
|
iowrite16(0, par->base + LDINTR); /* disable vsync irq */
|
|
par->irq = platform_get_irq(pdev, 0);
|
|
if (par->irq >= 0) {
|
|
ret = request_irq(par->irq, sh7760fb_irq, 0,
|
|
"sh7760-lcdc", &par->vsync);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "cannot grab IRQ\n");
|
|
par->irq = -ENXIO;
|
|
} else
|
|
disable_irq_nosync(par->irq);
|
|
}
|
|
|
|
fb_videomode_to_var(&info->var, par->pd->def_mode);
|
|
|
|
ret = sh7760fb_alloc_mem(info);
|
|
if (ret) {
|
|
dev_dbg(info->dev, "framebuffer memory allocation failed!\n");
|
|
goto out_unmap;
|
|
}
|
|
|
|
info->pseudo_palette = par->pseudo_palette;
|
|
|
|
/* fixup color register bitpositions. These are fixed by hardware */
|
|
info->var.red.offset = 11;
|
|
info->var.red.length = 5;
|
|
info->var.red.msb_right = 0;
|
|
|
|
info->var.green.offset = 5;
|
|
info->var.green.length = 6;
|
|
info->var.green.msb_right = 0;
|
|
|
|
info->var.blue.offset = 0;
|
|
info->var.blue.length = 5;
|
|
info->var.blue.msb_right = 0;
|
|
|
|
info->var.transp.offset = 0;
|
|
info->var.transp.length = 0;
|
|
info->var.transp.msb_right = 0;
|
|
|
|
strcpy(info->fix.id, "sh7760-lcdc");
|
|
|
|
/* set the DON2 bit now, before cmap allocation, as it will randomize
|
|
* palette memory.
|
|
*/
|
|
iowrite16(LDCNTR_DON2, par->base + LDCNTR);
|
|
info->fbops = &sh7760fb_ops;
|
|
|
|
ret = fb_alloc_cmap(&info->cmap, 256, 0);
|
|
if (ret) {
|
|
dev_dbg(info->dev, "Unable to allocate cmap memory\n");
|
|
goto out_mem;
|
|
}
|
|
|
|
ret = register_framebuffer(info);
|
|
if (ret < 0) {
|
|
dev_dbg(info->dev, "cannot register fb!\n");
|
|
goto out_cmap;
|
|
}
|
|
platform_set_drvdata(pdev, info);
|
|
|
|
printk(KERN_INFO "%s: memory at phys 0x%08lx-0x%08lx, size %ld KiB\n",
|
|
pdev->name,
|
|
(unsigned long)par->fbdma,
|
|
(unsigned long)(par->fbdma + info->screen_size - 1),
|
|
info->screen_size >> 10);
|
|
|
|
return 0;
|
|
|
|
out_cmap:
|
|
sh7760fb_blank(FB_BLANK_POWERDOWN, info);
|
|
fb_dealloc_cmap(&info->cmap);
|
|
out_mem:
|
|
sh7760fb_free_mem(info);
|
|
out_unmap:
|
|
if (par->irq >= 0)
|
|
free_irq(par->irq, &par->vsync);
|
|
iounmap(par->base);
|
|
out_res:
|
|
release_mem_region(res->start, resource_size(res));
|
|
out_fb:
|
|
framebuffer_release(info);
|
|
return ret;
|
|
}
|
|
|
|
static int sh7760fb_remove(struct platform_device *dev)
|
|
{
|
|
struct fb_info *info = platform_get_drvdata(dev);
|
|
struct sh7760fb_par *par = info->par;
|
|
|
|
sh7760fb_blank(FB_BLANK_POWERDOWN, info);
|
|
unregister_framebuffer(info);
|
|
fb_dealloc_cmap(&info->cmap);
|
|
sh7760fb_free_mem(info);
|
|
if (par->irq >= 0)
|
|
free_irq(par->irq, par);
|
|
iounmap(par->base);
|
|
release_mem_region(par->ioarea->start, resource_size(par->ioarea));
|
|
framebuffer_release(info);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver sh7760_lcdc_driver = {
|
|
.driver = {
|
|
.name = "sh7760-lcdc",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = sh7760fb_probe,
|
|
.remove = sh7760fb_remove,
|
|
};
|
|
|
|
module_platform_driver(sh7760_lcdc_driver);
|
|
|
|
MODULE_AUTHOR("Nobuhiro Iwamatsu, Manuel Lauss");
|
|
MODULE_DESCRIPTION("FBdev for SH7760/63 integrated LCD Controller");
|
|
MODULE_LICENSE("GPL");
|