pxafb: preliminary smart panel interface support

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Eric Miao <eric.miao@marvell.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 281 insertions, 43 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index a576dc261732..20a2bbd14ed7 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -1774,6 +1774,11 @@ config FB_PXA
 
           If unsure, say N.
 
+config FB_PXA_SMARTPANEL
+        bool "PXA Smartpanel LCD support"
+        default y
+        depends on FB_PXA
+
 config FB_PXA_PARAMETERS
         bool "PXA LCD command line parameters"
         default n
diff --git a/drivers/video/pxafb.c b/drivers/video/pxafb.c
index d11ea78a06d5..a4d656497e9d 100644
--- a/drivers/video/pxafb.c
+++ b/drivers/video/pxafb.c
@@ -40,6 +40,8 @@
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/completion.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
 
 #include <asm/hardware.h>
 #include <asm/io.h>
@@ -455,7 +457,7 @@ static int pxafb_mmap(struct fb_info *info,
         unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
 
         if (off < info->fix.smem_len) {
-                vma->vm_pgoff += 1;
+                vma->vm_pgoff += fbi->video_offset / PAGE_SIZE;
                 return dma_mmap_writecombine(fbi->dev, vma, fbi->map_cpu,
                                              fbi->map_dma, fbi->map_size);
         }
@@ -594,6 +596,183 @@ static int setup_frame_dma(struct pxafb_info *fbi, int dma, int pal,
         return 0;
 }
 
+#ifdef CONFIG_FB_PXA_SMARTPANEL
+static int setup_smart_dma(struct pxafb_info *fbi)
+{
+        struct pxafb_dma_descriptor *dma_desc;
+        unsigned long dma_desc_off, cmd_buff_off;
+
+        dma_desc = &fbi->dma_buff->dma_desc[DMA_CMD];
+        dma_desc_off = offsetof(struct pxafb_dma_buff, dma_desc[DMA_CMD]);
+        cmd_buff_off = offsetof(struct pxafb_dma_buff, cmd_buff);
+
+        dma_desc->fdadr = fbi->dma_buff_phys + dma_desc_off;
+        dma_desc->fsadr = fbi->dma_buff_phys + cmd_buff_off;
+        dma_desc->fidr  = 0;
+        dma_desc->ldcmd = fbi->n_smart_cmds * sizeof(uint16_t);
+
+        fbi->fdadr[DMA_CMD] = dma_desc->fdadr;
+        return 0;
+}
+
+int pxafb_smart_flush(struct fb_info *info)
+{
+        struct pxafb_info *fbi = container_of(info, struct pxafb_info, fb);
+        uint32_t prsr;
+        int ret = 0;
+
+        /* disable controller until all registers are set up */
+        lcd_writel(fbi, LCCR0, fbi->reg_lccr0 & ~LCCR0_ENB);
+
+        /* 1. make it an even number of commands to align on 32-bit boundary
+         * 2. add the interrupt command to the end of the chain so we can
+         *    keep track of the end of the transfer
+         */
+
+        while (fbi->n_smart_cmds & 1)
+                fbi->smart_cmds[fbi->n_smart_cmds++] = SMART_CMD_NOOP;
+
+        fbi->smart_cmds[fbi->n_smart_cmds++] = SMART_CMD_INTERRUPT;
+        fbi->smart_cmds[fbi->n_smart_cmds++] = SMART_CMD_WAIT_FOR_VSYNC;
+        setup_smart_dma(fbi);
+
+        /* continue to execute next command */
+        prsr = lcd_readl(fbi, PRSR) | PRSR_ST_OK | PRSR_CON_NT;
+        lcd_writel(fbi, PRSR, prsr);
+
+        /* stop the processor in case it executed "wait for sync" cmd */
+        lcd_writel(fbi, CMDCR, 0x0001);
+
+        /* don't send interrupts for fifo underruns on channel 6 */
+        lcd_writel(fbi, LCCR5, LCCR5_IUM(6));
+
+        lcd_writel(fbi, LCCR1, fbi->reg_lccr1);
+        lcd_writel(fbi, LCCR2, fbi->reg_lccr2);
+        lcd_writel(fbi, LCCR3, fbi->reg_lccr3);
+        lcd_writel(fbi, FDADR0, fbi->fdadr[0]);
+        lcd_writel(fbi, FDADR6, fbi->fdadr[6]);
+
+        /* begin sending */
+        lcd_writel(fbi, LCCR0, fbi->reg_lccr0 | LCCR0_ENB);
+
+        if (wait_for_completion_timeout(&fbi->command_done, HZ/2) == 0) {
+                pr_warning("%s: timeout waiting for command done\n",
+                                __func__);
+                ret = -ETIMEDOUT;
+        }
+
+        /* quick disable */
+        prsr = lcd_readl(fbi, PRSR) & ~(PRSR_ST_OK | PRSR_CON_NT);
+        lcd_writel(fbi, PRSR, prsr);
+        lcd_writel(fbi, LCCR0, fbi->reg_lccr0 & ~LCCR0_ENB);
+        lcd_writel(fbi, FDADR6, 0);
+        fbi->n_smart_cmds = 0;
+        return ret;
+}
+
+int pxafb_smart_queue(struct fb_info *info, uint16_t *cmds, int n_cmds)
+{
+        int i;
+        struct pxafb_info *fbi = container_of(info, struct pxafb_info, fb);
+
+        /* leave 2 commands for INTERRUPT and WAIT_FOR_SYNC */
+        for (i = 0; i < n_cmds; i++) {
+                if (fbi->n_smart_cmds == CMD_BUFF_SIZE - 8)
+                        pxafb_smart_flush(info);
+
+                fbi->smart_cmds[fbi->n_smart_cmds++] = *cmds++;
+        }
+
+        return 0;
+}
+
+static unsigned int __smart_timing(unsigned time_ns, unsigned long lcd_clk)
+{
+        unsigned int t = (time_ns * (lcd_clk / 1000000) / 1000);
+        return (t == 0) ? 1 : t;
+}
+
+static void setup_smart_timing(struct pxafb_info *fbi,
+                                struct fb_var_screeninfo *var)
+{
+        struct pxafb_mach_info *inf = fbi->dev->platform_data;
+        struct pxafb_mode_info *mode = &inf->modes[0];
+        unsigned long lclk = clk_get_rate(fbi->clk);
+        unsigned t1, t2, t3, t4;
+
+        t1 = max(mode->a0csrd_set_hld, mode->a0cswr_set_hld);
+        t2 = max(mode->rd_pulse_width, mode->wr_pulse_width);
+        t3 = mode->op_hold_time;
+        t4 = mode->cmd_inh_time;
+
+        fbi->reg_lccr1 =
+                LCCR1_DisWdth(var->xres) |
+                LCCR1_BegLnDel(__smart_timing(t1, lclk)) |
+                LCCR1_EndLnDel(__smart_timing(t2, lclk)) |
+                LCCR1_HorSnchWdth(__smart_timing(t3, lclk));
+
+        fbi->reg_lccr2 = LCCR2_DisHght(var->yres);
+        fbi->reg_lccr3 = LCCR3_PixClkDiv(__smart_timing(t4, lclk));
+
+        /* FIXME: make this configurable */
+        fbi->reg_cmdcr = 1;
+}
+
+static int pxafb_smart_thread(void *arg)
+{
+        struct pxafb_info *fbi = (struct pxafb_info *) arg;
+        struct pxafb_mach_info *inf = fbi->dev->platform_data;
+
+        if (!fbi || !inf->smart_update) {
+                pr_err("%s: not properly initialized, thread terminated\n",
+                                __func__);
+                return -EINVAL;
+        }
+
+        pr_debug("%s(): task starting\n", __func__);
+
+        set_freezable();
+        while (!kthread_should_stop()) {
+
+                if (try_to_freeze())
+                        continue;
+
+                if (fbi->state == C_ENABLE) {
+                        inf->smart_update(&fbi->fb);
+                        complete(&fbi->refresh_done);
+                }
+
+                set_current_state(TASK_INTERRUPTIBLE);
+                schedule_timeout(30 * HZ / 1000);
+        }
+
+        pr_debug("%s(): task ending\n", __func__);
+        return 0;
+}
+
+static int pxafb_smart_init(struct pxafb_info *fbi)
+{
+        fbi->smart_thread = kthread_run(pxafb_smart_thread, fbi,
+                                        "lcd_refresh");
+        if (IS_ERR(fbi->smart_thread)) {
+                printk(KERN_ERR "%s: unable to create kernel thread\n",
+                                __func__);
+                return PTR_ERR(fbi->smart_thread);
+        }
+        return 0;
+}
+#else
+int pxafb_smart_queue(struct fb_info *info, uint16_t *cmds, int n_cmds)
+{
+        return 0;
+}
+
+int pxafb_smart_flush(struct fb_info *info)
+{
+        return 0;
+}
+#endif /* CONFIG_FB_SMART_PANEL */
+
 static void setup_parallel_timing(struct pxafb_info *fbi,
                                   struct fb_var_screeninfo *var)
 {
@@ -643,47 +822,55 @@ static int pxafb_activate_var(struct fb_var_screeninfo *var,
         size_t nbytes;
 
 #if DEBUG_VAR
-        if (var->xres < 16 || var->xres > 1024)
-                printk(KERN_ERR "%s: invalid xres %d\n",
-                        fbi->fb.fix.id, var->xres);
-        switch (var->bits_per_pixel) {
-        case 1:
-        case 2:
-        case 4:
-        case 8:
-        case 16:
-                break;
-        default:
-                printk(KERN_ERR "%s: invalid bit depth %d\n",
-                       fbi->fb.fix.id, var->bits_per_pixel);
-                break;
+        if (!(fbi->lccr0 & LCCR0_LCDT)) {
+                if (var->xres < 16 || var->xres > 1024)
+                        printk(KERN_ERR "%s: invalid xres %d\n",
+                                fbi->fb.fix.id, var->xres);
+                switch (var->bits_per_pixel) {
+                case 1:
+                case 2:
+                case 4:
+                case 8:
+                case 16:
+                        break;
+                default:
+                        printk(KERN_ERR "%s: invalid bit depth %d\n",
+                               fbi->fb.fix.id, var->bits_per_pixel);
+                        break;
+                }
+
+                if (var->hsync_len < 1 || var->hsync_len > 64)
+                        printk(KERN_ERR "%s: invalid hsync_len %d\n",
+                                fbi->fb.fix.id, var->hsync_len);
+                if (var->left_margin < 1 || var->left_margin > 255)
+                        printk(KERN_ERR "%s: invalid left_margin %d\n",
+                                fbi->fb.fix.id, var->left_margin);
+                if (var->right_margin < 1 || var->right_margin > 255)
+                        printk(KERN_ERR "%s: invalid right_margin %d\n",
+                                fbi->fb.fix.id, var->right_margin);
+                if (var->yres < 1 || var->yres > 1024)
+                        printk(KERN_ERR "%s: invalid yres %d\n",
+                                fbi->fb.fix.id, var->yres);
+                if (var->vsync_len < 1 || var->vsync_len > 64)
+                        printk(KERN_ERR "%s: invalid vsync_len %d\n",
+                                fbi->fb.fix.id, var->vsync_len);
+                if (var->upper_margin < 0 || var->upper_margin > 255)
+                        printk(KERN_ERR "%s: invalid upper_margin %d\n",
+                                fbi->fb.fix.id, var->upper_margin);
+                if (var->lower_margin < 0 || var->lower_margin > 255)
+                        printk(KERN_ERR "%s: invalid lower_margin %d\n",
+                                fbi->fb.fix.id, var->lower_margin);
         }
-        if (var->hsync_len < 1 || var->hsync_len > 64)
-                printk(KERN_ERR "%s: invalid hsync_len %d\n",
-                        fbi->fb.fix.id, var->hsync_len);
-        if (var->left_margin < 1 || var->left_margin > 255)
-                printk(KERN_ERR "%s: invalid left_margin %d\n",
-                        fbi->fb.fix.id, var->left_margin);
-        if (var->right_margin < 1 || var->right_margin > 255)
-                printk(KERN_ERR "%s: invalid right_margin %d\n",
-                        fbi->fb.fix.id, var->right_margin);
-        if (var->yres < 1 || var->yres > 1024)
-                printk(KERN_ERR "%s: invalid yres %d\n",
-                        fbi->fb.fix.id, var->yres);
-        if (var->vsync_len < 1 || var->vsync_len > 64)
-                printk(KERN_ERR "%s: invalid vsync_len %d\n",
-                        fbi->fb.fix.id, var->vsync_len);
-        if (var->upper_margin < 0 || var->upper_margin > 255)
-                printk(KERN_ERR "%s: invalid upper_margin %d\n",
-                        fbi->fb.fix.id, var->upper_margin);
-        if (var->lower_margin < 0 || var->lower_margin > 255)
-                printk(KERN_ERR "%s: invalid lower_margin %d\n",
-                        fbi->fb.fix.id, var->lower_margin);
 #endif
         /* Update shadow copy atomically */
         local_irq_save(flags);
 
-        setup_parallel_timing(fbi, var);
+#ifdef CONFIG_FB_PXA_SMARTPANEL
+        if (fbi->lccr0 & LCCR0_LCDT)
+                setup_smart_timing(fbi, var);
+        else
+#endif
+                setup_parallel_timing(fbi, var);
 
         fbi->reg_lccr0 = fbi->lccr0 |
                 (LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM |
@@ -698,7 +885,7 @@ static int pxafb_activate_var(struct fb_var_screeninfo *var,
                 setup_frame_dma(fbi, DMA_LOWER, PAL_NONE, nbytes, nbytes);
         }
 
-        if (var->bits_per_pixel >= 16)
+        if ((var->bits_per_pixel >= 16) || (fbi->lccr0 & LCCR0_LCDT))
                 setup_frame_dma(fbi, DMA_BASE, PAL_NONE, 0, nbytes);
         else
                 setup_frame_dma(fbi, DMA_BASE, PAL_BASE, 0, nbytes);
@@ -801,6 +988,9 @@ static void pxafb_enable_controller(struct pxafb_info *fbi)
         /* enable LCD controller clock */
         clk_enable(fbi->clk);
 
+        if (fbi->lccr0 & LCCR0_LCDT)
+                return;
+
         /* Sequence from 11.7.10 */
         lcd_writel(fbi, LCCR3, fbi->reg_lccr3);
         lcd_writel(fbi, LCCR2, fbi->reg_lccr2);
@@ -816,6 +1006,14 @@ static void pxafb_disable_controller(struct pxafb_info *fbi)
 {
         uint32_t lccr0;
 
+#ifdef CONFIG_FB_PXA_SMARTPANEL
+        if (fbi->lccr0 & LCCR0_LCDT) {
+                wait_for_completion_timeout(&fbi->refresh_done,
+                                200 * HZ / 1000);
+                return;
+        }
+#endif
+
         /* Clear LCD Status Register */
         lcd_writel(fbi, LCSR, 0xffffffff);
 
@@ -843,6 +1041,11 @@ static irqreturn_t pxafb_handle_irq(int irq, void *dev_id)
                 complete(&fbi->disable_done);
         }
 
+#ifdef CONFIG_FB_PXA_SMARTPANEL
+        if (lcsr & LCSR_CMD_INT)
+                complete(&fbi->command_done);
+#endif
+
         lcd_writel(fbi, LCSR, lcsr);
         return IRQ_HANDLED;
 }
@@ -1050,15 +1253,17 @@ static int __init pxafb_map_video_memory(struct pxafb_info *fbi)
          * We reserve one page for the palette, plus the size
          * of the framebuffer.
          */
-        fbi->map_size = PAGE_ALIGN(fbi->fb.fix.smem_len + PAGE_SIZE);
+        fbi->video_offset = PAGE_ALIGN(sizeof(struct pxafb_dma_buff));
+        fbi->map_size = PAGE_ALIGN(fbi->fb.fix.smem_len + fbi->video_offset);
         fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
                                               &fbi->map_dma, GFP_KERNEL);
 
         if (fbi->map_cpu) {
                 /* prevent initial garbage on screen */
                 memset(fbi->map_cpu, 0, fbi->map_size);
-                fbi->fb.screen_base = fbi->map_cpu + PAGE_SIZE;
-                fbi->screen_dma = fbi->map_dma + PAGE_SIZE;
+                fbi->fb.screen_base = fbi->map_cpu + fbi->video_offset;
+                fbi->screen_dma = fbi->map_dma + fbi->video_offset;
+
                 /*
                  * FIXME: this is actually the wrong thing to place in
                  * smem_start.  But fbdev suffers from the problem that
@@ -1068,9 +1273,14 @@ static int __init pxafb_map_video_memory(struct pxafb_info *fbi)
                 fbi->fb.fix.smem_start = fbi->screen_dma;
                 fbi->palette_size = fbi->fb.var.bits_per_pixel == 8 ? 256 : 16;
 
-                fbi->dma_buff = (void *)fbi->map_cpu;
+                fbi->dma_buff = (void *) fbi->map_cpu;
                 fbi->dma_buff_phys = fbi->map_dma;
-                fbi->palette_cpu = (u16 *)&fbi->dma_buff->palette[0];
+                fbi->palette_cpu = (u16 *) fbi->dma_buff->palette;
+
+#ifdef CONFIG_FB_PXA_SMARTPANEL
+                fbi->smart_cmds = (uint16_t *) fbi->dma_buff->cmd_buff;
+                fbi->n_smart_cmds = 0;
+#endif
         }
 
         return fbi->map_cpu ? 0 : -ENOMEM;
@@ -1191,6 +1401,10 @@ static struct pxafb_info * __init pxafb_init_fbinfo(struct device *dev)
         INIT_WORK(&fbi->task, pxafb_task);
         init_MUTEX(&fbi->ctrlr_sem);
         init_completion(&fbi->disable_done);
+#ifdef CONFIG_FB_PXA_SMARTPANEL
+        init_completion(&fbi->command_done);
+        init_completion(&fbi->refresh_done);
+#endif
 
         return fbi;
 }
@@ -1510,6 +1724,13 @@ static int __init pxafb_probe(struct platform_device *dev)
                 goto failed_free_mem;
         }
 
+#ifdef CONFIG_FB_PXA_SMARTPANEL
+        ret = pxafb_smart_init(fbi);
+        if (ret) {
+                dev_err(&dev->dev, "failed to initialize smartpanel\n");
+                goto failed_free_irq;
+        }
+#endif
         /*
          * This makes sure that our colour bitfield
          * descriptors are correctly initialised.
diff --git a/drivers/video/pxafb.h b/drivers/video/pxafb.h
index c627b83497da..8238dc826429 100644
--- a/drivers/video/pxafb.h
+++ b/drivers/video/pxafb.h
@@ -52,9 +52,11 @@ enum {
 
 /* maximum palette size - 256 entries, each 4 bytes long */
 #define PALETTE_SIZE    (256 * 4)
+#define CMD_BUFF_SIZE   (1024 * 50)
 
 struct pxafb_dma_buff {
         unsigned char palette[PAL_MAX * PALETTE_SIZE];
+        uint16_t cmd_buff[CMD_BUFF_SIZE];
         struct pxafb_dma_descriptor pal_desc[PAL_MAX];
         struct pxafb_dma_descriptor dma_desc[DMA_MAX];
 };
@@ -84,6 +86,7 @@ struct pxafb_info {
         dma_addr_t              screen_dma;     /* physical address of frame buffer */
         u16 *                   palette_cpu;    /* virtual address of palette memory */
         u_int                   palette_size;
+        ssize_t                 video_offset;
 
         u_int                   lccr0;
         u_int                   lccr3;
@@ -97,6 +100,7 @@ struct pxafb_info {
         u_int                   reg_lccr2;
         u_int                   reg_lccr3;
         u_int                   reg_lccr4;
+        u_int                   reg_cmdcr;
 
         unsigned long   hsync_time;
 
@@ -108,6 +112,14 @@ struct pxafb_info {
 
         struct completion       disable_done;
 
+#ifdef CONFIG_FB_PXA_SMARTPANEL
+        uint16_t                *smart_cmds;
+        size_t                  n_smart_cmds;
+        struct completion       command_done;
+        struct completion       refresh_done;
+        struct task_struct      *smart_thread;
+#endif
+
 #ifdef CONFIG_CPU_FREQ
         struct notifier_block   freq_transition;
         struct notifier_block   freq_policy;