mdp.c

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/* drivers/video/msm_fb/mdp.c
 *
 * MSM MDP Interface (used by framebuffer core)
 *
 * Copyright (C) 2007 QUALCOMM Incorporated
 * Copyright (C) 2007 Google Incorporated
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/fb.h>
#include <linux/msm_mdp.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/clk.h>
#include <linux/file.h>
#include <linux/major.h>
#include <linux/slab.h>

#include <linux/platform_data/video-msm_fb.h>
#include <linux/platform_device.h>
#include <linux/export.h>

#include "mdp_hw.h"

struct class *mdp_class;

#define MDP_CMD_DEBUG_ACCESS_BASE (0x10000)

static uint16_t mdp_default_ccs[] = {
    0x254, 0x000, 0x331, 0x254, 0xF38, 0xE61, 0x254, 0x409, 0x000,
    0x010, 0x080, 0x080
};

static DECLARE_WAIT_QUEUE_HEAD(mdp_dma2_waitqueue);
static DECLARE_WAIT_QUEUE_HEAD(mdp_ppp_waitqueue);
static struct msmfb_callback *dma_callback;
static struct clk *clk;
static unsigned int mdp_irq_mask;
static DEFINE_SPINLOCK(mdp_lock);
DEFINE_MUTEX(mdp_mutex);

static int enable_mdp_irq(struct mdp_info *mdp, uint32_t mask)
{
    unsigned long irq_flags;
    int ret = 0;

    BUG_ON(!mask);

    spin_lock_irqsave(&mdp_lock, irq_flags);
    /* if the mask bits are already set return an error, this interrupt
     * is already enabled */
    if (mdp_irq_mask & mask) {
        printk(KERN_ERR "mdp irq already on already on %x %x\n",
               mdp_irq_mask, mask);
        ret = -1;
    }
    /* if the mdp irq is not already enabled enable it */
    if (!mdp_irq_mask) {
        if (clk)
            clk_enable(clk);
        enable_irq(mdp->irq);
    }

    /* update the irq mask to reflect the fact that the interrupt is
     * enabled */
    mdp_irq_mask |= mask;
    spin_unlock_irqrestore(&mdp_lock, irq_flags);
    return ret;
}

static int locked_disable_mdp_irq(struct mdp_info *mdp, uint32_t mask)
{
    /* this interrupt is already disabled! */
    if (!(mdp_irq_mask & mask)) {
        printk(KERN_ERR "mdp irq already off %x %x\n",
               mdp_irq_mask, mask);
        return -1;
    }
    /* update the irq mask to reflect the fact that the interrupt is
     * disabled */
    mdp_irq_mask &= ~(mask);
    /* if no one is waiting on the interrupt, disable it */
    if (!mdp_irq_mask) {
        disable_irq_nosync(mdp->irq);
        if (clk)
            clk_disable(clk);
    }
    return 0;
}

static int disable_mdp_irq(struct mdp_info *mdp, uint32_t mask)
{
    unsigned long irq_flags;
    int ret;

    spin_lock_irqsave(&mdp_lock, irq_flags);
    ret = locked_disable_mdp_irq(mdp, mask);
    spin_unlock_irqrestore(&mdp_lock, irq_flags);
    return ret;
}

static irqreturn_t mdp_isr(int irq, void *data)
{
    uint32_t status;
    unsigned long irq_flags;
    struct mdp_info *mdp = data;

    spin_lock_irqsave(&mdp_lock, irq_flags);

    status = mdp_readl(mdp, MDP_INTR_STATUS);
    mdp_writel(mdp, status, MDP_INTR_CLEAR);

    status &= mdp_irq_mask;
    if (status & DL0_DMA2_TERM_DONE) {
        if (dma_callback) {
            dma_callback->func(dma_callback);
            dma_callback = NULL;
        }
        wake_up(&mdp_dma2_waitqueue);
    }

    if (status & DL0_ROI_DONE)
        wake_up(&mdp_ppp_waitqueue);

    if (status)
        locked_disable_mdp_irq(mdp, status);

    spin_unlock_irqrestore(&mdp_lock, irq_flags);
    return IRQ_HANDLED;
}

static uint32_t mdp_check_mask(uint32_t mask)
{
    uint32_t ret;
    unsigned long irq_flags;

    spin_lock_irqsave(&mdp_lock, irq_flags);
    ret = mdp_irq_mask & mask;
    spin_unlock_irqrestore(&mdp_lock, irq_flags);
    return ret;
}

static int mdp_wait(struct mdp_info *mdp, uint32_t mask, wait_queue_head_t *wq)
{
    int ret = 0;
    unsigned long irq_flags;

    wait_event_timeout(*wq, !mdp_check_mask(mask), HZ);

    spin_lock_irqsave(&mdp_lock, irq_flags);
    if (mdp_irq_mask & mask) {
        locked_disable_mdp_irq(mdp, mask);
        printk(KERN_WARNING "timeout waiting for mdp to complete %x\n",
               mask);
        ret = -ETIMEDOUT;
    }
    spin_unlock_irqrestore(&mdp_lock, irq_flags);

    return ret;
}

void mdp_dma_wait(struct mdp_device *mdp_dev)
{
#define MDP_MAX_TIMEOUTS 20
    static int timeout_count;
    struct mdp_info *mdp = container_of(mdp_dev, struct mdp_info, mdp_dev);

    if (mdp_wait(mdp, DL0_DMA2_TERM_DONE, &mdp_dma2_waitqueue) == -ETIMEDOUT)
        timeout_count++;
    else
        timeout_count = 0;

    if (timeout_count > MDP_MAX_TIMEOUTS) {
        printk(KERN_ERR "mdp: dma failed %d times, somethings wrong!\n",
               MDP_MAX_TIMEOUTS);
        BUG();
    }
}

static int mdp_ppp_wait(struct mdp_info *mdp)
{
    return mdp_wait(mdp, DL0_ROI_DONE, &mdp_ppp_waitqueue);
}

void mdp_dma_to_mddi(struct mdp_info *mdp, uint32_t addr, uint32_t stride,
             uint32_t width, uint32_t height, uint32_t x, uint32_t y,
             struct msmfb_callback *callback)
{
    uint32_t dma2_cfg;
    uint16_t ld_param = 0; /* 0=PRIM, 1=SECD, 2=EXT */

    if (enable_mdp_irq(mdp, DL0_DMA2_TERM_DONE)) {
        printk(KERN_ERR "mdp_dma_to_mddi: busy\n");
        return;
    }

    dma_callback = callback;

    dma2_cfg = DMA_PACK_TIGHT |
        DMA_PACK_ALIGN_LSB |
        DMA_PACK_PATTERN_RGB |
        DMA_OUT_SEL_AHB |
        DMA_IBUF_NONCONTIGUOUS;

    dma2_cfg |= DMA_IBUF_FORMAT_RGB565;

    dma2_cfg |= DMA_OUT_SEL_MDDI;

    dma2_cfg |= DMA_MDDI_DMAOUT_LCD_SEL_PRIMARY;

    dma2_cfg |= DMA_DITHER_EN;

    /* setup size, address, and stride */
    mdp_writel(mdp, (height << 16) | (width),
           MDP_CMD_DEBUG_ACCESS_BASE + 0x0184);
    mdp_writel(mdp, addr, MDP_CMD_DEBUG_ACCESS_BASE + 0x0188);
    mdp_writel(mdp, stride, MDP_CMD_DEBUG_ACCESS_BASE + 0x018C);

    /* 666 18BPP */
    dma2_cfg |= DMA_DSTC0G_6BITS | DMA_DSTC1B_6BITS | DMA_DSTC2R_6BITS;

    /* set y & x offset and MDDI transaction parameters */
    mdp_writel(mdp, (y << 16) | (x), MDP_CMD_DEBUG_ACCESS_BASE + 0x0194);
    mdp_writel(mdp, ld_param, MDP_CMD_DEBUG_ACCESS_BASE + 0x01a0);
    mdp_writel(mdp, (MDDI_VDO_PACKET_DESC << 16) | MDDI_VDO_PACKET_PRIM,
           MDP_CMD_DEBUG_ACCESS_BASE + 0x01a4);

    mdp_writel(mdp, dma2_cfg, MDP_CMD_DEBUG_ACCESS_BASE + 0x0180);

    /* start DMA2 */
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x0044);
}

void mdp_dma(struct mdp_device *mdp_dev, uint32_t addr, uint32_t stride,
         uint32_t width, uint32_t height, uint32_t x, uint32_t y,
         struct msmfb_callback *callback, int interface)
{
    struct mdp_info *mdp = container_of(mdp_dev, struct mdp_info, mdp_dev);

    if (interface == MSM_MDDI_PMDH_INTERFACE) {
        mdp_dma_to_mddi(mdp, addr, stride, width, height, x, y,
                callback);
    }
}

int get_img(struct mdp_img *img, struct fb_info *info,
        unsigned long *start, unsigned long *len,
        struct file **filep)
{
    int ret = 0;
    struct fd f = fdget(img->memory_id);
    if (f.file == NULL)
        return -1;

    if (MAJOR(f.file->f_dentry->d_inode->i_rdev) == FB_MAJOR) {
        *start = info->fix.smem_start;
        *len = info->fix.smem_len;
    } else
        ret = -1;
    fdput(f);

    return ret;
}

void put_img(struct file *src_file, struct file *dst_file)
{
}

int mdp_blit(struct mdp_device *mdp_dev, struct fb_info *fb,
         struct mdp_blit_req *req)
{
    int ret;
    unsigned long src_start = 0, src_len = 0, dst_start = 0, dst_len = 0;
    struct mdp_info *mdp = container_of(mdp_dev, struct mdp_info, mdp_dev);
    struct file *src_file = 0, *dst_file = 0;

    /* WORKAROUND FOR HARDWARE BUG IN BG TILE FETCH */
    if (unlikely(req->src_rect.h == 0 ||
             req->src_rect.w == 0)) {
        printk(KERN_ERR "mpd_ppp: src img of zero size!\n");
        return -EINVAL;
    }
    if (unlikely(req->dst_rect.h == 0 ||
             req->dst_rect.w == 0))
        return -EINVAL;

    /* do this first so that if this fails, the caller can always
     * safely call put_img */
    if (unlikely(get_img(&req->src, fb, &src_start, &src_len, &src_file))) {
        printk(KERN_ERR "mpd_ppp: could not retrieve src image from "
                "memory\n");
        return -EINVAL;
    }

    if (unlikely(get_img(&req->dst, fb, &dst_start, &dst_len, &dst_file))) {
        printk(KERN_ERR "mpd_ppp: could not retrieve dst image from "
                "memory\n");
        return -EINVAL;
    }
    mutex_lock(&mdp_mutex);

    /* transp_masking unimplemented */
    req->transp_mask = MDP_TRANSP_NOP;
    if (unlikely((req->transp_mask != MDP_TRANSP_NOP ||
              req->alpha != MDP_ALPHA_NOP ||
              HAS_ALPHA(req->src.format)) &&
             (req->flags & MDP_ROT_90 &&
              req->dst_rect.w <= 16 && req->dst_rect.h >= 16))) {
        int i;
        unsigned int tiles = req->dst_rect.h / 16;
        unsigned int remainder = req->dst_rect.h % 16;
        req->src_rect.w = 16*req->src_rect.w / req->dst_rect.h;
        req->dst_rect.h = 16;
        for (i = 0; i < tiles; i++) {
            enable_mdp_irq(mdp, DL0_ROI_DONE);
            ret = mdp_ppp_blit(mdp, req, src_file, src_start,
                       src_len, dst_file, dst_start,
                       dst_len);
            if (ret)
                goto err_bad_blit;
            ret = mdp_ppp_wait(mdp);
            if (ret)
                goto err_wait_failed;
            req->dst_rect.y += 16;
            req->src_rect.x += req->src_rect.w;
        }
        if (!remainder)
            goto end;
        req->src_rect.w = remainder*req->src_rect.w / req->dst_rect.h;
        req->dst_rect.h = remainder;
    }
    enable_mdp_irq(mdp, DL0_ROI_DONE);
    ret = mdp_ppp_blit(mdp, req, src_file, src_start, src_len, dst_file,
               dst_start,
               dst_len);
    if (ret)
        goto err_bad_blit;
    ret = mdp_ppp_wait(mdp);
    if (ret)
        goto err_wait_failed;
end:
    put_img(src_file, dst_file);
    mutex_unlock(&mdp_mutex);
    return 0;
err_bad_blit:
    disable_mdp_irq(mdp, DL0_ROI_DONE);
err_wait_failed:
    put_img(src_file, dst_file);
    mutex_unlock(&mdp_mutex);
    return ret;
}

void mdp_set_grp_disp(struct mdp_device *mdp_dev, unsigned disp_id)
{
    struct mdp_info *mdp = container_of(mdp_dev, struct mdp_info, mdp_dev);

    disp_id &= 0xf;
    mdp_writel(mdp, disp_id, MDP_FULL_BYPASS_WORD43);
}

int register_mdp_client(struct class_interface *cint)
{
    if (!mdp_class) {
        pr_err("mdp: no mdp_class when registering mdp client\n");
        return -ENODEV;
    }
    cint->class = mdp_class;
    return class_interface_register(cint);
}

#include "mdp_csc_table.h"
#include "mdp_scale_tables.h"

int mdp_probe(struct platform_device *pdev)
{
    struct resource *resource;
    int ret;
    int n;
    struct mdp_info *mdp;

    resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!resource) {
        pr_err("mdp: can not get mdp mem resource!\n");
        return -ENOMEM;
    }

    mdp = kzalloc(sizeof(struct mdp_info), GFP_KERNEL);
    if (!mdp)
        return -ENOMEM;

    mdp->irq = platform_get_irq(pdev, 0);
    if (mdp->irq < 0) {
        pr_err("mdp: can not get mdp irq\n");
        ret = mdp->irq;
        goto error_get_irq;
    }

    mdp->base = ioremap(resource->start, resource_size(resource));
    if (mdp->base == 0) {
        printk(KERN_ERR "msmfb: cannot allocate mdp regs!\n");
        ret = -ENOMEM;
        goto error_ioremap;
    }

    mdp->mdp_dev.dma = mdp_dma;
    mdp->mdp_dev.dma_wait = mdp_dma_wait;
    mdp->mdp_dev.blit = mdp_blit;
    mdp->mdp_dev.set_grp_disp = mdp_set_grp_disp;

    clk = clk_get(&pdev->dev, "mdp_clk");
    if (IS_ERR(clk)) {
        printk(KERN_INFO "mdp: failed to get mdp clk");
        ret = PTR_ERR(clk);
        goto error_get_clk;
    }

    ret = request_irq(mdp->irq, mdp_isr, 0, "msm_mdp", mdp);
    if (ret)
        goto error_request_irq;
    disable_irq(mdp->irq);
    mdp_irq_mask = 0;

    /* debug interface write access */
    mdp_writel(mdp, 1, 0x60);

    mdp_writel(mdp, MDP_ANY_INTR_MASK, MDP_INTR_ENABLE);
    mdp_writel(mdp, 1, MDP_EBI2_PORTMAP_MODE);

    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x01f8);
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x01fc);

    for (n = 0; n < ARRAY_SIZE(csc_table); n++)
        mdp_writel(mdp, csc_table[n].val, csc_table[n].reg);

    /* clear up unused fg/main registers */
    /* comp.plane 2&3 ystride */
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x0120);

    /* unpacked pattern */
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x012c);
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x0130);
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x0134);
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x0158);
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x015c);
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x0160);
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x0170);
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x0174);
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x017c);

    /* comp.plane 2 & 3 */
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x0114);
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x0118);

    /* clear unused bg registers */
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x01c8);
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x01d0);
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x01dc);
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x01e0);
    mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x01e4);

    for (n = 0; n < ARRAY_SIZE(mdp_upscale_table); n++)
        mdp_writel(mdp, mdp_upscale_table[n].val,
               mdp_upscale_table[n].reg);

    for (n = 0; n < 9; n++)
        mdp_writel(mdp, mdp_default_ccs[n], 0x40440 + 4 * n);
    mdp_writel(mdp, mdp_default_ccs[9], 0x40500 + 4 * 0);
    mdp_writel(mdp, mdp_default_ccs[10], 0x40500 + 4 * 0);
    mdp_writel(mdp, mdp_default_ccs[11], 0x40500 + 4 * 0);

    /* register mdp device */
    mdp->mdp_dev.dev.parent = &pdev->dev;
    mdp->mdp_dev.dev.class = mdp_class;
    dev_set_name(&mdp->mdp_dev.dev, "mdp%d", pdev->id);

    /* if you can remove the platform device you'd have to implement
     * this:
    mdp_dev.release = mdp_class; */

    ret = device_register(&mdp->mdp_dev.dev);
    if (ret)
        goto error_device_register;
    return 0;

error_device_register:
    free_irq(mdp->irq, mdp);
error_request_irq:
error_get_clk:
    iounmap(mdp->base);
error_get_irq:
error_ioremap:
    kfree(mdp);
    return ret;
}

static struct platform_driver msm_mdp_driver = {
    .probe = mdp_probe,
    .driver = {.name = "msm_mdp"},
};

static int __init mdp_init(void)
{
    mdp_class = class_create(THIS_MODULE, "msm_mdp");
    if (IS_ERR(mdp_class)) {
        printk(KERN_ERR "Error creating mdp class\n");
        return PTR_ERR(mdp_class);
    }
    return platform_driver_register(&msm_mdp_driver);
}

subsys_initcall(mdp_init);