#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
#include <video/sh_mobile_lcdc.h>
+#include <asm/atomic.h>
#define PALETTE_NR 16
u32 pseudo_palette[PALETTE_NR];
struct fb_info info;
dma_addr_t dma_handle;
+ struct fb_deferred_io defio;
+ unsigned long frame_end;
+ wait_queue_head_t frame_end_wait;
};
struct sh_mobile_lcdc_priv {
void __iomem *base;
+ int irq;
#ifdef CONFIG_HAVE_CLK
+ atomic_t clk_usecnt;
struct clk *dot_clk;
struct clk *clk;
#endif
unsigned long lddckr;
struct sh_mobile_lcdc_chan ch[2];
+ int started;
};
/* shared registers */
/* per-channel registers */
enum { LDDCKPAT1R, LDDCKPAT2R, LDMT1R, LDMT2R, LDMT3R, LDDFR, LDSM1R,
- LDSA1R, LDMLSR, LDHCNR, LDHSYNR, LDVLNR, LDVSYNR, LDPMR };
+ LDSM2R, LDSA1R, LDMLSR, LDHCNR, LDHSYNR, LDVLNR, LDVSYNR, LDPMR };
static unsigned long lcdc_offs_mainlcd[] = {
[LDDCKPAT1R] = 0x400,
[LDMT3R] = 0x420,
[LDDFR] = 0x424,
[LDSM1R] = 0x428,
+ [LDSM2R] = 0x42c,
[LDSA1R] = 0x430,
[LDMLSR] = 0x438,
[LDHCNR] = 0x448,
[LDMT3R] = 0x608,
[LDDFR] = 0x60c,
[LDSM1R] = 0x610,
+ [LDSM2R] = 0x614,
[LDSA1R] = 0x618,
[LDMLSR] = 0x620,
[LDHCNR] = 0x624,
#define LCDC_RESET 0x00000100
#define DISPLAY_BEU 0x00000008
#define LCDC_ENABLE 0x00000001
+#define LDINTR_FE 0x00000400
+#define LDINTR_FS 0x00000004
static void lcdc_write_chan(struct sh_mobile_lcdc_chan *chan,
int reg_nr, unsigned long data)
lcdc_sys_read_data,
};
+#ifdef CONFIG_HAVE_CLK
+static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv)
+{
+ if (atomic_inc_and_test(&priv->clk_usecnt)) {
+ clk_enable(priv->clk);
+ 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->clk_usecnt) == -1) {
+ if (priv->dot_clk)
+ clk_disable(priv->dot_clk);
+ clk_disable(priv->clk);
+ }
+}
+#else
+static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv) {}
+static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv) {}
+#endif
+
+static void sh_mobile_lcdc_deferred_io(struct fb_info *info,
+ struct list_head *pagelist)
+{
+ struct sh_mobile_lcdc_chan *ch = info->par;
+
+ /* enable clocks before accessing hardware */
+ sh_mobile_lcdc_clk_on(ch->lcdc);
+
+ /* trigger panel update */
+ 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;
+ int is_sub;
+ int k;
+
+ /* acknowledge interrupt */
+ tmp = lcdc_read(priv, _LDINTR);
+ tmp &= 0xffffff00; /* mask in high 24 bits */
+ tmp |= 0x000000ff ^ LDINTR_FS; /* status in low 8 */
+ 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;
+
+ if (is_sub == lcdc_chan_is_sublcd(ch)) {
+ ch->frame_end = 1;
+ wake_up(&ch->frame_end_wait);
+
+ sh_mobile_lcdc_clk_off(priv);
+ }
+ }
+
+ return IRQ_HANDLED;
+}
+
static void sh_mobile_lcdc_start_stop(struct sh_mobile_lcdc_priv *priv,
int start)
{
int k, m;
int ret = 0;
-#ifdef CONFIG_HAVE_CLK
- clk_enable(priv->clk);
- if (priv->dot_clk)
- clk_enable(priv->dot_clk);
-#endif
+ /* enable clocks before accessing the hardware */
+ for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
+ if (priv->ch[k].enabled)
+ sh_mobile_lcdc_clk_on(priv);
+
/* reset */
lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) | LCDC_RESET);
lcdc_wait_bit(priv, _LDCNT2R, LCDC_RESET, 0);
lcdc_write(priv, _LDDCKSTPR, 0);
lcdc_wait_bit(priv, _LDDCKSTPR, ~0, 0);
- /* interrupts are disabled */
+ /* interrupts are disabled to begin with */
lcdc_write(priv, _LDINTR, 0);
for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
return ret;
}
- /* --- display_lcdc_data() --- */
- lcdc_write(priv, _LDINTR, 0x00000f00);
-
/* word and long word swap */
lcdc_write(priv, _LDDDSR, lcdc_read(priv, _LDDDSR) | 6);
/* set line size */
lcdc_write_chan(ch, LDMLSR, ch->info.fix.line_length);
- /* continuous read mode */
- lcdc_write_chan(ch, LDSM1R, 0);
+ /* setup deferred io if SYS bus */
+ tmp = ch->cfg.sys_bus_cfg.deferred_io_msec;
+ if (ch->ldmt1r_value & (1 << 12) && tmp) {
+ ch->defio.deferred_io = sh_mobile_lcdc_deferred_io;
+ ch->defio.delay = msecs_to_jiffies(tmp);
+ ch->info.fbdefio = &ch->defio;
+ fb_deferred_io_init(&ch->info);
+
+ /* one-shot mode */
+ lcdc_write_chan(ch, LDSM1R, 1);
+
+ /* enable "Frame End Interrupt Enable" bit */
+ lcdc_write(priv, _LDINTR, LDINTR_FE);
+
+ } else {
+ /* continuous read mode */
+ lcdc_write_chan(ch, LDSM1R, 0);
+ }
}
/* display output */
/* start the lcdc */
sh_mobile_lcdc_start_stop(priv, 1);
+ priv->started = 1;
/* tell the board code to enable the panel */
for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
struct sh_mobile_lcdc_board_cfg *board_cfg;
int k;
- /* tell the board code to disable the panel */
+ /* clean up deferred io and ask board code to disable panel */
for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
ch = &priv->ch[k];
+
+ /* deferred io mode:
+ * flush frame, and wait for frame end interrupt
+ * clean up deferred io and enable clock
+ */
+ if (ch->info.fbdefio) {
+ ch->frame_end = 0;
+ schedule_delayed_work(&ch->info.deferred_work, 0);
+ wait_event(ch->frame_end_wait, ch->frame_end);
+ fb_deferred_io_cleanup(&ch->info);
+ ch->info.fbdefio = NULL;
+ sh_mobile_lcdc_clk_on(priv);
+ }
+
board_cfg = &ch->cfg.board_cfg;
if (board_cfg->display_off)
board_cfg->display_off(board_cfg->board_data);
+
}
/* stop the lcdc */
- sh_mobile_lcdc_start_stop(priv, 0);
+ if (priv->started) {
+ sh_mobile_lcdc_start_stop(priv, 0);
+ priv->started = 0;
+ }
-#ifdef CONFIG_HAVE_CLK
- if (priv->dot_clk)
- clk_disable(priv->dot_clk);
- clk_disable(priv->clk);
-#endif
+ /* stop clocks */
+ for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
+ if (priv->ch[k].enabled)
+ sh_mobile_lcdc_clk_off(priv);
}
static int sh_mobile_lcdc_check_interface(struct sh_mobile_lcdc_chan *ch)
priv->lddckr = icksel << 16;
#ifdef CONFIG_HAVE_CLK
+ atomic_set(&priv->clk_usecnt, -1);
snprintf(clk_name, sizeof(clk_name), "lcdc%d", pdev->id);
priv->clk = clk_get(&pdev->dev, clk_name);
if (IS_ERR(priv->clk)) {
.accel = FB_ACCEL_NONE,
};
+static void sh_mobile_lcdc_fillrect(struct fb_info *info,
+ const struct fb_fillrect *rect)
+{
+ sys_fillrect(info, rect);
+ sh_mobile_lcdc_deferred_io_touch(info);
+}
+
+static void sh_mobile_lcdc_copyarea(struct fb_info *info,
+ const struct fb_copyarea *area)
+{
+ sys_copyarea(info, area);
+ sh_mobile_lcdc_deferred_io_touch(info);
+}
+
+static void sh_mobile_lcdc_imageblit(struct fb_info *info,
+ const struct fb_image *image)
+{
+ sys_imageblit(info, image);
+ sh_mobile_lcdc_deferred_io_touch(info);
+}
+
static struct fb_ops sh_mobile_lcdc_ops = {
.fb_setcolreg = sh_mobile_lcdc_setcolreg,
- .fb_fillrect = cfb_fillrect,
- .fb_copyarea = cfb_copyarea,
- .fb_imageblit = cfb_imageblit,
+ .fb_read = fb_sys_read,
+ .fb_write = fb_sys_write,
+ .fb_fillrect = sh_mobile_lcdc_fillrect,
+ .fb_copyarea = sh_mobile_lcdc_copyarea,
+ .fb_imageblit = sh_mobile_lcdc_imageblit,
};
static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp)
return 0;
}
+static int sh_mobile_lcdc_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ sh_mobile_lcdc_stop(platform_get_drvdata(pdev));
+ return 0;
+}
+
+static int sh_mobile_lcdc_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ return sh_mobile_lcdc_start(platform_get_drvdata(pdev));
+}
+
+static struct dev_pm_ops sh_mobile_lcdc_dev_pm_ops = {
+ .suspend = sh_mobile_lcdc_suspend,
+ .resume = sh_mobile_lcdc_resume,
+};
+
static int sh_mobile_lcdc_remove(struct platform_device *pdev);
static int __init sh_mobile_lcdc_probe(struct platform_device *pdev)
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (res == NULL) {
- dev_err(&pdev->dev, "cannot find IO resource\n");
+ i = platform_get_irq(pdev, 0);
+ if (!res || i < 0) {
+ dev_err(&pdev->dev, "cannot get platform resources\n");
error = -ENOENT;
goto err0;
}
goto err0;
}
+ error = request_irq(i, sh_mobile_lcdc_irq, IRQF_DISABLED,
+ dev_name(&pdev->dev), priv);
+ if (error) {
+ dev_err(&pdev->dev, "unable to request irq\n");
+ goto err1;
+ }
+
+ priv->irq = i;
platform_set_drvdata(pdev, priv);
pdata = pdev->dev.platform_data;
dev_err(&pdev->dev, "unsupported interface type\n");
goto err1;
}
+ init_waitqueue_head(&priv->ch[i].frame_end_wait);
switch (pdata->ch[i].chan) {
case LCDC_CHAN_MAINLCD:
info->fix.smem_start = priv->ch[i].dma_handle;
info->screen_base = buf;
info->device = &pdev->dev;
+ info->par = &priv->ch[i];
}
if (error)
(int) priv->ch[i].cfg.lcd_cfg.xres,
(int) priv->ch[i].cfg.lcd_cfg.yres,
priv->ch[i].cfg.bpp);
+
+ /* deferred io mode: disable clock to save power */
+ if (info->fbdefio)
+ sh_mobile_lcdc_clk_off(priv);
}
return 0;
if (priv->base)
iounmap(priv->base);
+ if (priv->irq)
+ free_irq(priv->irq, priv);
kfree(priv);
return 0;
}
.driver = {
.name = "sh_mobile_lcdc_fb",
.owner = THIS_MODULE,
+ .pm = &sh_mobile_lcdc_dev_pm_ops,
},
.probe = sh_mobile_lcdc_probe,
.remove = sh_mobile_lcdc_remove,
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff