ipu_common: Let the MX6 IPU clock be calculated in run-time

[people/ms/u-boot.git] / drivers / video / ipu_common.c

/*
 * Porting to u-boot:
 *
 * (C) Copyright 2010
 * Stefano Babic, DENX Software Engineering, sbabic@denx.de
 *
 * Linux IPU driver for MX51:
 *
 * (C) Copyright 2005-2010 Freescale Semiconductor, Inc.
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

/* #define DEBUG */
#include <common.h>
#include <linux/types.h>
#include <linux/err.h>
#include <asm/io.h>
#include <linux/errno.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/crm_regs.h>
#include <asm/arch/sys_proto.h>
#include <div64.h>
#include "ipu.h"
#include "ipu_regs.h"

extern struct mxc_ccm_reg *mxc_ccm;
extern u32 *ipu_cpmem_base;

struct ipu_ch_param_word {
        uint32_t data[5];
        uint32_t res[3];
};

struct ipu_ch_param {
        struct ipu_ch_param_word word[2];
};

#define ipu_ch_param_addr(ch) (((struct ipu_ch_param *)ipu_cpmem_base) + (ch))

#define _param_word(base, w) \
        (((struct ipu_ch_param *)(base))->word[(w)].data)

#define ipu_ch_param_set_field(base, w, bit, size, v) { \
        int i = (bit) / 32; \
        int off = (bit) % 32; \
        _param_word(base, w)[i] |= (v) << off; \
        if (((bit) + (size) - 1) / 32 > i) { \
                _param_word(base, w)[i + 1] |= (v) >> (off ? (32 - off) : 0); \
        } \
}

#define ipu_ch_param_mod_field(base, w, bit, size, v) { \
        int i = (bit) / 32; \
        int off = (bit) % 32; \
        u32 mask = (1UL << size) - 1; \
        u32 temp = _param_word(base, w)[i]; \
        temp &= ~(mask << off); \
        _param_word(base, w)[i] = temp | (v) << off; \
        if (((bit) + (size) - 1) / 32 > i) { \
                temp = _param_word(base, w)[i + 1]; \
                temp &= ~(mask >> (32 - off)); \
                _param_word(base, w)[i + 1] = \
                        temp | ((v) >> (off ? (32 - off) : 0)); \
        } \
}

#define ipu_ch_param_read_field(base, w, bit, size) ({ \
        u32 temp2; \
        int i = (bit) / 32; \
        int off = (bit) % 32; \
        u32 mask = (1UL << size) - 1; \
        u32 temp1 = _param_word(base, w)[i]; \
        temp1 = mask & (temp1 >> off); \
        if (((bit)+(size) - 1) / 32 > i) { \
                temp2 = _param_word(base, w)[i + 1]; \
                temp2 &= mask >> (off ? (32 - off) : 0); \
                temp1 |= temp2 << (off ? (32 - off) : 0); \
        } \
        temp1; \
})

#define IPU_SW_RST_TOUT_USEC    (10000)

#define IPUV3_CLK_MX51          133000000
#define IPUV3_CLK_MX53          200000000
#define IPUV3_CLK_MX6Q          264000000
#define IPUV3_CLK_MX6DL         198000000

void clk_enable(struct clk *clk)
{
        if (clk) {
                if (clk->usecount++ == 0) {
                        clk->enable(clk);
                }
        }
}

void clk_disable(struct clk *clk)
{
        if (clk) {
                if (!(--clk->usecount)) {
                        if (clk->disable)
                                clk->disable(clk);
                }
        }
}

int clk_get_usecount(struct clk *clk)
{
        if (clk == NULL)
                return 0;

        return clk->usecount;
}

u32 clk_get_rate(struct clk *clk)
{
        if (!clk)
                return 0;

        return clk->rate;
}

struct clk *clk_get_parent(struct clk *clk)
{
        if (!clk)
                return 0;

        return clk->parent;
}

int clk_set_rate(struct clk *clk, unsigned long rate)
{
        if (clk && clk->set_rate)
                clk->set_rate(clk, rate);
        return clk->rate;
}

long clk_round_rate(struct clk *clk, unsigned long rate)
{
        if (clk == NULL || !clk->round_rate)
                return 0;

        return clk->round_rate(clk, rate);
}

int clk_set_parent(struct clk *clk, struct clk *parent)
{
        clk->parent = parent;
        if (clk->set_parent)
                return clk->set_parent(clk, parent);
        return 0;
}

static int clk_ipu_enable(struct clk *clk)
{
        u32 reg;

        reg = __raw_readl(clk->enable_reg);
        reg |= MXC_CCM_CCGR_CG_MASK << clk->enable_shift;
        __raw_writel(reg, clk->enable_reg);

#if defined(CONFIG_MX51) || defined(CONFIG_MX53)
        /* Handshake with IPU when certain clock rates are changed. */
        reg = __raw_readl(&mxc_ccm->ccdr);
        reg &= ~MXC_CCM_CCDR_IPU_HS_MASK;
        __raw_writel(reg, &mxc_ccm->ccdr);

        /* Handshake with IPU when LPM is entered as its enabled. */
        reg = __raw_readl(&mxc_ccm->clpcr);
        reg &= ~MXC_CCM_CLPCR_BYPASS_IPU_LPM_HS;
        __raw_writel(reg, &mxc_ccm->clpcr);
#endif
        return 0;
}

static void clk_ipu_disable(struct clk *clk)
{
        u32 reg;

        reg = __raw_readl(clk->enable_reg);
        reg &= ~(MXC_CCM_CCGR_CG_MASK << clk->enable_shift);
        __raw_writel(reg, clk->enable_reg);

#if defined(CONFIG_MX51) || defined(CONFIG_MX53)
        /*
         * No handshake with IPU whe dividers are changed
         * as its not enabled.
         */
        reg = __raw_readl(&mxc_ccm->ccdr);
        reg |= MXC_CCM_CCDR_IPU_HS_MASK;
        __raw_writel(reg, &mxc_ccm->ccdr);

        /* No handshake with IPU when LPM is entered as its not enabled. */
        reg = __raw_readl(&mxc_ccm->clpcr);
        reg |= MXC_CCM_CLPCR_BYPASS_IPU_LPM_HS;
        __raw_writel(reg, &mxc_ccm->clpcr);
#endif
}


static struct clk ipu_clk = {
        .name = "ipu_clk",
#if defined(CONFIG_MX51) || defined(CONFIG_MX53)
        .enable_reg = (u32 *)(CCM_BASE_ADDR +
                offsetof(struct mxc_ccm_reg, CCGR5)),
        .enable_shift = MXC_CCM_CCGR5_IPU_OFFSET,
#else
        .enable_reg = (u32 *)(CCM_BASE_ADDR +
                offsetof(struct mxc_ccm_reg, CCGR3)),
        .enable_shift = MXC_CCM_CCGR3_IPU1_IPU_DI0_OFFSET,
#endif
        .enable = clk_ipu_enable,
        .disable = clk_ipu_disable,
        .usecount = 0,
};

#if !defined CONFIG_SYS_LDB_CLOCK
#define CONFIG_SYS_LDB_CLOCK 65000000
#endif

static struct clk ldb_clk = {
        .name = "ldb_clk",
        .rate = CONFIG_SYS_LDB_CLOCK,
        .usecount = 0,
};

/* Globals */
struct clk *g_ipu_clk;
struct clk *g_ldb_clk;
unsigned char g_ipu_clk_enabled;
struct clk *g_di_clk[2];
struct clk *g_pixel_clk[2];
unsigned char g_dc_di_assignment[10];
uint32_t g_channel_init_mask;
uint32_t g_channel_enable_mask;

static int ipu_dc_use_count;
static int ipu_dp_use_count;
static int ipu_dmfc_use_count;
static int ipu_di_use_count[2];

u32 *ipu_cpmem_base;
u32 *ipu_dc_tmpl_reg;

/* Static functions */

static inline void ipu_ch_param_set_high_priority(uint32_t ch)
{
        ipu_ch_param_mod_field(ipu_ch_param_addr(ch), 1, 93, 2, 1);
};

static inline uint32_t channel_2_dma(ipu_channel_t ch, ipu_buffer_t type)
{
        return ((uint32_t) ch >> (6 * type)) & 0x3F;
};

/* Either DP BG or DP FG can be graphic window */
static inline int ipu_is_dp_graphic_chan(uint32_t dma_chan)
{
        return (dma_chan == 23 || dma_chan == 27);
}

static inline int ipu_is_dmfc_chan(uint32_t dma_chan)
{
        return ((dma_chan >= 23) && (dma_chan <= 29));
}


static inline void ipu_ch_param_set_buffer(uint32_t ch, int bufNum,
                                            dma_addr_t phyaddr)
{
        ipu_ch_param_mod_field(ipu_ch_param_addr(ch), 1, 29 * bufNum, 29,
                               phyaddr / 8);
};

#define idma_is_valid(ch)       (ch != NO_DMA)
#define idma_mask(ch)           (idma_is_valid(ch) ? (1UL << (ch & 0x1F)) : 0)
#define idma_is_set(reg, dma)   (__raw_readl(reg(dma)) & idma_mask(dma))

static void ipu_pixel_clk_recalc(struct clk *clk)
{
        u32 div;
        u64 final_rate = (unsigned long long)clk->parent->rate * 16;

        div = __raw_readl(DI_BS_CLKGEN0(clk->id));
        debug("read BS_CLKGEN0 div:%d, final_rate:%lld, prate:%ld\n",
              div, final_rate, clk->parent->rate);

        clk->rate = 0;
        if (div != 0) {
                do_div(final_rate, div);
                clk->rate = final_rate;
        }
}

static unsigned long ipu_pixel_clk_round_rate(struct clk *clk,
        unsigned long rate)
{
        u64 div, final_rate;
        u32 remainder;
        u64 parent_rate = (unsigned long long)clk->parent->rate * 16;

        /*
         * Calculate divider
         * Fractional part is 4 bits,
         * so simply multiply by 2^4 to get fractional part.
         */
        div = parent_rate;
        remainder = do_div(div, rate);
        /* Round the divider value */
        if (remainder > (rate / 2))
                div++;
        if (div < 0x10)            /* Min DI disp clock divider is 1 */
                div = 0x10;
        if (div & ~0xFEF)
                div &= 0xFF8;
        else {
                /* Round up divider if it gets us closer to desired pix clk */
                if ((div & 0xC) == 0xC) {
                        div += 0x10;
                        div &= ~0xF;
                }
        }
        final_rate = parent_rate;
        do_div(final_rate, div);

        return final_rate;
}

static int ipu_pixel_clk_set_rate(struct clk *clk, unsigned long rate)
{
        u64 div, parent_rate;
        u32 remainder;

        parent_rate = (unsigned long long)clk->parent->rate * 16;
        div = parent_rate;
        remainder = do_div(div, rate);
        /* Round the divider value */
        if (remainder > (rate / 2))
                div++;

        /* Round up divider if it gets us closer to desired pix clk */
        if ((div & 0xC) == 0xC) {
                div += 0x10;
                div &= ~0xF;
        }
        if (div > 0x1000)
                debug("Overflow, DI_BS_CLKGEN0 div:0x%x\n", (u32)div);

        __raw_writel(div, DI_BS_CLKGEN0(clk->id));

        /*
         * Setup pixel clock timing
         * Down time is half of period
         */
        __raw_writel((div / 16) << 16, DI_BS_CLKGEN1(clk->id));

        do_div(parent_rate, div);

        clk->rate = parent_rate;

        return 0;
}

static int ipu_pixel_clk_enable(struct clk *clk)
{
        u32 disp_gen = __raw_readl(IPU_DISP_GEN);
        disp_gen |= clk->id ? DI1_COUNTER_RELEASE : DI0_COUNTER_RELEASE;
        __raw_writel(disp_gen, IPU_DISP_GEN);

        return 0;
}

static void ipu_pixel_clk_disable(struct clk *clk)
{
        u32 disp_gen = __raw_readl(IPU_DISP_GEN);
        disp_gen &= clk->id ? ~DI1_COUNTER_RELEASE : ~DI0_COUNTER_RELEASE;
        __raw_writel(disp_gen, IPU_DISP_GEN);

}

static int ipu_pixel_clk_set_parent(struct clk *clk, struct clk *parent)
{
        u32 di_gen = __raw_readl(DI_GENERAL(clk->id));

        if (parent == g_ipu_clk)
                di_gen &= ~DI_GEN_DI_CLK_EXT;
        else if (!IS_ERR(g_di_clk[clk->id]) && parent == g_ldb_clk)
                di_gen |= DI_GEN_DI_CLK_EXT;
        else
                return -EINVAL;

        __raw_writel(di_gen, DI_GENERAL(clk->id));
        ipu_pixel_clk_recalc(clk);
        return 0;
}

static struct clk pixel_clk[] = {
        {
        .name = "pixel_clk",
        .id = 0,
        .recalc = ipu_pixel_clk_recalc,
        .set_rate = ipu_pixel_clk_set_rate,
        .round_rate = ipu_pixel_clk_round_rate,
        .set_parent = ipu_pixel_clk_set_parent,
        .enable = ipu_pixel_clk_enable,
        .disable = ipu_pixel_clk_disable,
        .usecount = 0,
        },
        {
        .name = "pixel_clk",
        .id = 1,
        .recalc = ipu_pixel_clk_recalc,
        .set_rate = ipu_pixel_clk_set_rate,
        .round_rate = ipu_pixel_clk_round_rate,
        .set_parent = ipu_pixel_clk_set_parent,
        .enable = ipu_pixel_clk_enable,
        .disable = ipu_pixel_clk_disable,
        .usecount = 0,
        },
};

/*
 * This function resets IPU
 */
static void ipu_reset(void)
{
        u32 *reg;
        u32 value;
        int timeout = IPU_SW_RST_TOUT_USEC;

        reg = (u32 *)SRC_BASE_ADDR;
        value = __raw_readl(reg);
        value = value | SW_IPU_RST;
        __raw_writel(value, reg);

        while (__raw_readl(reg) & SW_IPU_RST) {
                udelay(1);
                if (!(timeout--)) {
                        printf("ipu software reset timeout\n");
                        break;
                }
        };
}

/*
 * This function is called by the driver framework to initialize the IPU
 * hardware.
 *
 * @param       dev     The device structure for the IPU passed in by the
 *                      driver framework.
 *
 * @return      Returns 0 on success or negative error code on error
 */
int ipu_probe(void)
{
        unsigned long ipu_base;
#if defined CONFIG_MX51
        u32 temp;

        u32 *reg_hsc_mcd = (u32 *)MIPI_HSC_BASE_ADDR;
        u32 *reg_hsc_mxt_conf = (u32 *)(MIPI_HSC_BASE_ADDR + 0x800);

         __raw_writel(0xF00, reg_hsc_mcd);

        /* CSI mode reserved*/
        temp = __raw_readl(reg_hsc_mxt_conf);
         __raw_writel(temp | 0x0FF, reg_hsc_mxt_conf);

        temp = __raw_readl(reg_hsc_mxt_conf);
        __raw_writel(temp | 0x10000, reg_hsc_mxt_conf);
#endif

        ipu_base = IPU_CTRL_BASE_ADDR;
        ipu_cpmem_base = (u32 *)(ipu_base + IPU_CPMEM_REG_BASE);
        ipu_dc_tmpl_reg = (u32 *)(ipu_base + IPU_DC_TMPL_REG_BASE);

        g_pixel_clk[0] = &pixel_clk[0];
        g_pixel_clk[1] = &pixel_clk[1];

        g_ipu_clk = &ipu_clk;
#if defined(CONFIG_MX51)
        g_ipu_clk->rate = IPUV3_CLK_MX51;
#elif defined(CONFIG_MX53)
        g_ipu_clk->rate = IPUV3_CLK_MX53;
#else
        g_ipu_clk->rate = is_mx6sdl() ? IPUV3_CLK_MX6DL : IPUV3_CLK_MX6Q;
#endif
        debug("ipu_clk = %u\n", clk_get_rate(g_ipu_clk));
        g_ldb_clk = &ldb_clk;
        debug("ldb_clk = %u\n", clk_get_rate(g_ldb_clk));
        ipu_reset();

        clk_set_parent(g_pixel_clk[0], g_ipu_clk);
        clk_set_parent(g_pixel_clk[1], g_ipu_clk);
        clk_enable(g_ipu_clk);

        g_di_clk[0] = NULL;
        g_di_clk[1] = NULL;

        __raw_writel(0x807FFFFF, IPU_MEM_RST);
        while (__raw_readl(IPU_MEM_RST) & 0x80000000)
                ;

        ipu_init_dc_mappings();

        __raw_writel(0, IPU_INT_CTRL(5));
        __raw_writel(0, IPU_INT_CTRL(6));
        __raw_writel(0, IPU_INT_CTRL(9));
        __raw_writel(0, IPU_INT_CTRL(10));

        /* DMFC Init */
        ipu_dmfc_init(DMFC_NORMAL, 1);

        /* Set sync refresh channels as high priority */
        __raw_writel(0x18800000L, IDMAC_CHA_PRI(0));

        /* Set MCU_T to divide MCU access window into 2 */
        __raw_writel(0x00400000L | (IPU_MCU_T_DEFAULT << 18), IPU_DISP_GEN);

        clk_disable(g_ipu_clk);

        return 0;
}

void ipu_dump_registers(void)
{
        debug("IPU_CONF = \t0x%08X\n", __raw_readl(IPU_CONF));
        debug("IDMAC_CONF = \t0x%08X\n", __raw_readl(IDMAC_CONF));
        debug("IDMAC_CHA_EN1 = \t0x%08X\n",
               __raw_readl(IDMAC_CHA_EN(0)));
        debug("IDMAC_CHA_EN2 = \t0x%08X\n",
               __raw_readl(IDMAC_CHA_EN(32)));
        debug("IDMAC_CHA_PRI1 = \t0x%08X\n",
               __raw_readl(IDMAC_CHA_PRI(0)));
        debug("IDMAC_CHA_PRI2 = \t0x%08X\n",
               __raw_readl(IDMAC_CHA_PRI(32)));
        debug("IPU_CHA_DB_MODE_SEL0 = \t0x%08X\n",
               __raw_readl(IPU_CHA_DB_MODE_SEL(0)));
        debug("IPU_CHA_DB_MODE_SEL1 = \t0x%08X\n",
               __raw_readl(IPU_CHA_DB_MODE_SEL(32)));
        debug("DMFC_WR_CHAN = \t0x%08X\n",
               __raw_readl(DMFC_WR_CHAN));
        debug("DMFC_WR_CHAN_DEF = \t0x%08X\n",
               __raw_readl(DMFC_WR_CHAN_DEF));
        debug("DMFC_DP_CHAN = \t0x%08X\n",
               __raw_readl(DMFC_DP_CHAN));
        debug("DMFC_DP_CHAN_DEF = \t0x%08X\n",
               __raw_readl(DMFC_DP_CHAN_DEF));
        debug("DMFC_IC_CTRL = \t0x%08X\n",
               __raw_readl(DMFC_IC_CTRL));
        debug("IPU_FS_PROC_FLOW1 = \t0x%08X\n",
               __raw_readl(IPU_FS_PROC_FLOW1));
        debug("IPU_FS_PROC_FLOW2 = \t0x%08X\n",
               __raw_readl(IPU_FS_PROC_FLOW2));
        debug("IPU_FS_PROC_FLOW3 = \t0x%08X\n",
               __raw_readl(IPU_FS_PROC_FLOW3));
        debug("IPU_FS_DISP_FLOW1 = \t0x%08X\n",
               __raw_readl(IPU_FS_DISP_FLOW1));
}

/*
 * This function is called to initialize a logical IPU channel.
 *
 * @param       channel Input parameter for the logical channel ID to init.
 *
 * @param       params  Input parameter containing union of channel
 *                      initialization parameters.
 *
 * @return      Returns 0 on success or negative error code on fail
 */
int32_t ipu_init_channel(ipu_channel_t channel, ipu_channel_params_t *params)
{
        int ret = 0;
        uint32_t ipu_conf;

        debug("init channel = %d\n", IPU_CHAN_ID(channel));

        if (g_ipu_clk_enabled == 0) {
                g_ipu_clk_enabled = 1;
                clk_enable(g_ipu_clk);
        }


        if (g_channel_init_mask & (1L << IPU_CHAN_ID(channel))) {
                printf("Warning: channel already initialized %d\n",
                        IPU_CHAN_ID(channel));
        }

        ipu_conf = __raw_readl(IPU_CONF);

        switch (channel) {
        case MEM_DC_SYNC:
                if (params->mem_dc_sync.di > 1) {
                        ret = -EINVAL;
                        goto err;
                }

                g_dc_di_assignment[1] = params->mem_dc_sync.di;
                ipu_dc_init(1, params->mem_dc_sync.di,
                             params->mem_dc_sync.interlaced);
                ipu_di_use_count[params->mem_dc_sync.di]++;
                ipu_dc_use_count++;
                ipu_dmfc_use_count++;
                break;
        case MEM_BG_SYNC:
                if (params->mem_dp_bg_sync.di > 1) {
                        ret = -EINVAL;
                        goto err;
                }

                g_dc_di_assignment[5] = params->mem_dp_bg_sync.di;
                ipu_dp_init(channel, params->mem_dp_bg_sync.in_pixel_fmt,
                             params->mem_dp_bg_sync.out_pixel_fmt);
                ipu_dc_init(5, params->mem_dp_bg_sync.di,
                             params->mem_dp_bg_sync.interlaced);
                ipu_di_use_count[params->mem_dp_bg_sync.di]++;
                ipu_dc_use_count++;
                ipu_dp_use_count++;
                ipu_dmfc_use_count++;
                break;
        case MEM_FG_SYNC:
                ipu_dp_init(channel, params->mem_dp_fg_sync.in_pixel_fmt,
                             params->mem_dp_fg_sync.out_pixel_fmt);

                ipu_dc_use_count++;
                ipu_dp_use_count++;
                ipu_dmfc_use_count++;
                break;
        default:
                printf("Missing channel initialization\n");
                break;
        }

        /* Enable IPU sub module */
        g_channel_init_mask |= 1L << IPU_CHAN_ID(channel);
        if (ipu_dc_use_count == 1)
                ipu_conf |= IPU_CONF_DC_EN;
        if (ipu_dp_use_count == 1)
                ipu_conf |= IPU_CONF_DP_EN;
        if (ipu_dmfc_use_count == 1)
                ipu_conf |= IPU_CONF_DMFC_EN;
        if (ipu_di_use_count[0] == 1) {
                ipu_conf |= IPU_CONF_DI0_EN;
        }
        if (ipu_di_use_count[1] == 1) {
                ipu_conf |= IPU_CONF_DI1_EN;
        }

        __raw_writel(ipu_conf, IPU_CONF);

err:
        return ret;
}

/*
 * This function is called to uninitialize a logical IPU channel.
 *
 * @param       channel Input parameter for the logical channel ID to uninit.
 */
void ipu_uninit_channel(ipu_channel_t channel)
{
        uint32_t reg;
        uint32_t in_dma, out_dma = 0;
        uint32_t ipu_conf;

        if ((g_channel_init_mask & (1L << IPU_CHAN_ID(channel))) == 0) {
                debug("Channel already uninitialized %d\n",
                        IPU_CHAN_ID(channel));
                return;
        }

        /*
         * Make sure channel is disabled
         * Get input and output dma channels
         */
        in_dma = channel_2_dma(channel, IPU_OUTPUT_BUFFER);
        out_dma = channel_2_dma(channel, IPU_VIDEO_IN_BUFFER);

        if (idma_is_set(IDMAC_CHA_EN, in_dma) ||
            idma_is_set(IDMAC_CHA_EN, out_dma)) {
                printf(
                        "Channel %d is not disabled, disable first\n",
                        IPU_CHAN_ID(channel));
                return;
        }

        ipu_conf = __raw_readl(IPU_CONF);

        /* Reset the double buffer */
        reg = __raw_readl(IPU_CHA_DB_MODE_SEL(in_dma));
        __raw_writel(reg & ~idma_mask(in_dma), IPU_CHA_DB_MODE_SEL(in_dma));
        reg = __raw_readl(IPU_CHA_DB_MODE_SEL(out_dma));
        __raw_writel(reg & ~idma_mask(out_dma), IPU_CHA_DB_MODE_SEL(out_dma));

        switch (channel) {
        case MEM_DC_SYNC:
                ipu_dc_uninit(1);
                ipu_di_use_count[g_dc_di_assignment[1]]--;
                ipu_dc_use_count--;
                ipu_dmfc_use_count--;
                break;
        case MEM_BG_SYNC:
                ipu_dp_uninit(channel);
                ipu_dc_uninit(5);
                ipu_di_use_count[g_dc_di_assignment[5]]--;
                ipu_dc_use_count--;
                ipu_dp_use_count--;
                ipu_dmfc_use_count--;
                break;
        case MEM_FG_SYNC:
                ipu_dp_uninit(channel);
                ipu_dc_use_count--;
                ipu_dp_use_count--;
                ipu_dmfc_use_count--;
                break;
        default:
                break;
        }

        g_channel_init_mask &= ~(1L << IPU_CHAN_ID(channel));

        if (ipu_dc_use_count == 0)
                ipu_conf &= ~IPU_CONF_DC_EN;
        if (ipu_dp_use_count == 0)
                ipu_conf &= ~IPU_CONF_DP_EN;
        if (ipu_dmfc_use_count == 0)
                ipu_conf &= ~IPU_CONF_DMFC_EN;
        if (ipu_di_use_count[0] == 0) {
                ipu_conf &= ~IPU_CONF_DI0_EN;
        }
        if (ipu_di_use_count[1] == 0) {
                ipu_conf &= ~IPU_CONF_DI1_EN;
        }

        __raw_writel(ipu_conf, IPU_CONF);

        if (ipu_conf == 0) {
                clk_disable(g_ipu_clk);
                g_ipu_clk_enabled = 0;
        }

}

static inline void ipu_ch_param_dump(int ch)
{
#ifdef DEBUG
        struct ipu_ch_param *p = ipu_ch_param_addr(ch);
        debug("ch %d word 0 - %08X %08X %08X %08X %08X\n", ch,
                 p->word[0].data[0], p->word[0].data[1], p->word[0].data[2],
                 p->word[0].data[3], p->word[0].data[4]);
        debug("ch %d word 1 - %08X %08X %08X %08X %08X\n", ch,
                 p->word[1].data[0], p->word[1].data[1], p->word[1].data[2],
                 p->word[1].data[3], p->word[1].data[4]);
        debug("PFS 0x%x, ",
                 ipu_ch_param_read_field(ipu_ch_param_addr(ch), 1, 85, 4));
        debug("BPP 0x%x, ",
                 ipu_ch_param_read_field(ipu_ch_param_addr(ch), 0, 107, 3));
        debug("NPB 0x%x\n",
                 ipu_ch_param_read_field(ipu_ch_param_addr(ch), 1, 78, 7));

        debug("FW %d, ",
                 ipu_ch_param_read_field(ipu_ch_param_addr(ch), 0, 125, 13));
        debug("FH %d, ",
                 ipu_ch_param_read_field(ipu_ch_param_addr(ch), 0, 138, 12));
        debug("Stride %d\n",
                 ipu_ch_param_read_field(ipu_ch_param_addr(ch), 1, 102, 14));

        debug("Width0 %d+1, ",
                 ipu_ch_param_read_field(ipu_ch_param_addr(ch), 1, 116, 3));
        debug("Width1 %d+1, ",
                 ipu_ch_param_read_field(ipu_ch_param_addr(ch), 1, 119, 3));
        debug("Width2 %d+1, ",
                 ipu_ch_param_read_field(ipu_ch_param_addr(ch), 1, 122, 3));
        debug("Width3 %d+1, ",
                 ipu_ch_param_read_field(ipu_ch_param_addr(ch), 1, 125, 3));
        debug("Offset0 %d, ",
                 ipu_ch_param_read_field(ipu_ch_param_addr(ch), 1, 128, 5));
        debug("Offset1 %d, ",
                 ipu_ch_param_read_field(ipu_ch_param_addr(ch), 1, 133, 5));
        debug("Offset2 %d, ",
                 ipu_ch_param_read_field(ipu_ch_param_addr(ch), 1, 138, 5));
        debug("Offset3 %d\n",
                 ipu_ch_param_read_field(ipu_ch_param_addr(ch), 1, 143, 5));
#endif
}

static inline void ipu_ch_params_set_packing(struct ipu_ch_param *p,
                                              int red_width, int red_offset,
                                              int green_width, int green_offset,
                                              int blue_width, int blue_offset,
                                              int alpha_width, int alpha_offset)
{
        /* Setup red width and offset */
        ipu_ch_param_set_field(p, 1, 116, 3, red_width - 1);
        ipu_ch_param_set_field(p, 1, 128, 5, red_offset);
        /* Setup green width and offset */
        ipu_ch_param_set_field(p, 1, 119, 3, green_width - 1);
        ipu_ch_param_set_field(p, 1, 133, 5, green_offset);
        /* Setup blue width and offset */
        ipu_ch_param_set_field(p, 1, 122, 3, blue_width - 1);
        ipu_ch_param_set_field(p, 1, 138, 5, blue_offset);
        /* Setup alpha width and offset */
        ipu_ch_param_set_field(p, 1, 125, 3, alpha_width - 1);
        ipu_ch_param_set_field(p, 1, 143, 5, alpha_offset);
}

static void ipu_ch_param_init(int ch,
                              uint32_t pixel_fmt, uint32_t width,
                              uint32_t height, uint32_t stride,
                              uint32_t u, uint32_t v,
                              uint32_t uv_stride, dma_addr_t addr0,
                              dma_addr_t addr1)
{
        uint32_t u_offset = 0;
        uint32_t v_offset = 0;
        struct ipu_ch_param params;

        memset(&params, 0, sizeof(params));

        ipu_ch_param_set_field(&params, 0, 125, 13, width - 1);

        if ((ch == 8) || (ch == 9) || (ch == 10)) {
                ipu_ch_param_set_field(&params, 0, 138, 12, (height / 2) - 1);
                ipu_ch_param_set_field(&params, 1, 102, 14, (stride * 2) - 1);
        } else {
                ipu_ch_param_set_field(&params, 0, 138, 12, height - 1);
                ipu_ch_param_set_field(&params, 1, 102, 14, stride - 1);
        }

        ipu_ch_param_set_field(&params, 1, 0, 29, addr0 >> 3);
        ipu_ch_param_set_field(&params, 1, 29, 29, addr1 >> 3);

        switch (pixel_fmt) {
        case IPU_PIX_FMT_GENERIC:
                /*Represents 8-bit Generic data */
                ipu_ch_param_set_field(&params, 0, 107, 3, 5);  /* bits/pixel */
                ipu_ch_param_set_field(&params, 1, 85, 4, 6);   /* pix format */
                ipu_ch_param_set_field(&params, 1, 78, 7, 63);  /* burst size */

                break;
        case IPU_PIX_FMT_GENERIC_32:
                /*Represents 32-bit Generic data */
                break;
        case IPU_PIX_FMT_RGB565:
                ipu_ch_param_set_field(&params, 0, 107, 3, 3);  /* bits/pixel */
                ipu_ch_param_set_field(&params, 1, 85, 4, 7);   /* pix format */
                ipu_ch_param_set_field(&params, 1, 78, 7, 15);  /* burst size */

                ipu_ch_params_set_packing(&params, 5, 0, 6, 5, 5, 11, 8, 16);
                break;
        case IPU_PIX_FMT_BGR24:
                ipu_ch_param_set_field(&params, 0, 107, 3, 1);  /* bits/pixel */
                ipu_ch_param_set_field(&params, 1, 85, 4, 7);   /* pix format */
                ipu_ch_param_set_field(&params, 1, 78, 7, 19);  /* burst size */

                ipu_ch_params_set_packing(&params, 8, 0, 8, 8, 8, 16, 8, 24);
                break;
        case IPU_PIX_FMT_RGB24:
        case IPU_PIX_FMT_YUV444:
                ipu_ch_param_set_field(&params, 0, 107, 3, 1);  /* bits/pixel */
                ipu_ch_param_set_field(&params, 1, 85, 4, 7);   /* pix format */
                ipu_ch_param_set_field(&params, 1, 78, 7, 19);  /* burst size */

                ipu_ch_params_set_packing(&params, 8, 16, 8, 8, 8, 0, 8, 24);
                break;
        case IPU_PIX_FMT_BGRA32:
        case IPU_PIX_FMT_BGR32:
                ipu_ch_param_set_field(&params, 0, 107, 3, 0);  /* bits/pixel */
                ipu_ch_param_set_field(&params, 1, 85, 4, 7);   /* pix format */
                ipu_ch_param_set_field(&params, 1, 78, 7, 15);  /* burst size */

                ipu_ch_params_set_packing(&params, 8, 8, 8, 16, 8, 24, 8, 0);
                break;
        case IPU_PIX_FMT_RGBA32:
        case IPU_PIX_FMT_RGB32:
                ipu_ch_param_set_field(&params, 0, 107, 3, 0);  /* bits/pixel */
                ipu_ch_param_set_field(&params, 1, 85, 4, 7);   /* pix format */
                ipu_ch_param_set_field(&params, 1, 78, 7, 15);  /* burst size */

                ipu_ch_params_set_packing(&params, 8, 24, 8, 16, 8, 8, 8, 0);
                break;
        case IPU_PIX_FMT_ABGR32:
                ipu_ch_param_set_field(&params, 0, 107, 3, 0);  /* bits/pixel */
                ipu_ch_param_set_field(&params, 1, 85, 4, 7);   /* pix format */

                ipu_ch_params_set_packing(&params, 8, 0, 8, 8, 8, 16, 8, 24);
                break;
        case IPU_PIX_FMT_UYVY:
                ipu_ch_param_set_field(&params, 0, 107, 3, 3);  /* bits/pixel */
                ipu_ch_param_set_field(&params, 1, 85, 4, 0xA); /* pix format */
                ipu_ch_param_set_field(&params, 1, 78, 7, 15);  /* burst size */
                break;
        case IPU_PIX_FMT_YUYV:
                ipu_ch_param_set_field(&params, 0, 107, 3, 3);  /* bits/pixel */
                ipu_ch_param_set_field(&params, 1, 85, 4, 0x8); /* pix format */
                ipu_ch_param_set_field(&params, 1, 78, 7, 31);  /* burst size */
                break;
        case IPU_PIX_FMT_YUV420P2:
        case IPU_PIX_FMT_YUV420P:
                ipu_ch_param_set_field(&params, 1, 85, 4, 2);   /* pix format */

                if (uv_stride < stride / 2)
                        uv_stride = stride / 2;

                u_offset = stride * height;
                v_offset = u_offset + (uv_stride * height / 2);
                /* burst size */
                if ((ch == 8) || (ch == 9) || (ch == 10)) {
                        ipu_ch_param_set_field(&params, 1, 78, 7, 15);
                        uv_stride = uv_stride*2;
                } else {
                        ipu_ch_param_set_field(&params, 1, 78, 7, 31);
                }
                break;
        case IPU_PIX_FMT_YVU422P:
                /* BPP & pixel format */
                ipu_ch_param_set_field(&params, 1, 85, 4, 1);   /* pix format */
                ipu_ch_param_set_field(&params, 1, 78, 7, 31);  /* burst size */

                if (uv_stride < stride / 2)
                        uv_stride = stride / 2;

                v_offset = (v == 0) ? stride * height : v;
                u_offset = (u == 0) ? v_offset + v_offset / 2 : u;
                break;
        case IPU_PIX_FMT_YUV422P:
                /* BPP & pixel format */
                ipu_ch_param_set_field(&params, 1, 85, 4, 1);   /* pix format */
                ipu_ch_param_set_field(&params, 1, 78, 7, 31);  /* burst size */

                if (uv_stride < stride / 2)
                        uv_stride = stride / 2;

                u_offset = (u == 0) ? stride * height : u;
                v_offset = (v == 0) ? u_offset + u_offset / 2 : v;
                break;
        case IPU_PIX_FMT_NV12:
                /* BPP & pixel format */
                ipu_ch_param_set_field(&params, 1, 85, 4, 4);   /* pix format */
                ipu_ch_param_set_field(&params, 1, 78, 7, 31);  /* burst size */
                uv_stride = stride;
                u_offset = (u == 0) ? stride * height : u;
                break;
        default:
                puts("mxc ipu: unimplemented pixel format\n");
                break;
        }


        if (uv_stride)
                ipu_ch_param_set_field(&params, 1, 128, 14, uv_stride - 1);

        /* Get the uv offset from user when need cropping */
        if (u || v) {
                u_offset = u;
                v_offset = v;
        }

        /* UBO and VBO are 22-bit */
        if (u_offset/8 > 0x3fffff)
                puts("The value of U offset exceeds IPU limitation\n");
        if (v_offset/8 > 0x3fffff)
                puts("The value of V offset exceeds IPU limitation\n");

        ipu_ch_param_set_field(&params, 0, 46, 22, u_offset / 8);
        ipu_ch_param_set_field(&params, 0, 68, 22, v_offset / 8);

        debug("initializing idma ch %d @ %p\n", ch, ipu_ch_param_addr(ch));
        memcpy(ipu_ch_param_addr(ch), &params, sizeof(params));
};

/*
 * This function is called to initialize a buffer for logical IPU channel.
 *
 * @param       channel         Input parameter for the logical channel ID.
 *
 * @param       type            Input parameter which buffer to initialize.
 *
 * @param       pixel_fmt       Input parameter for pixel format of buffer.
 *                              Pixel format is a FOURCC ASCII code.
 *
 * @param       width           Input parameter for width of buffer in pixels.
 *
 * @param       height          Input parameter for height of buffer in pixels.
 *
 * @param       stride          Input parameter for stride length of buffer
 *                              in pixels.
 *
 * @param       phyaddr_0       Input parameter buffer 0 physical address.
 *
 * @param       phyaddr_1       Input parameter buffer 1 physical address.
 *                              Setting this to a value other than NULL enables
 *                              double buffering mode.
 *
 * @param       u               private u offset for additional cropping,
 *                              zero if not used.
 *
 * @param       v               private v offset for additional cropping,
 *                              zero if not used.
 *
 * @return      Returns 0 on success or negative error code on fail
 */
int32_t ipu_init_channel_buffer(ipu_channel_t channel, ipu_buffer_t type,
                                uint32_t pixel_fmt,
                                uint16_t width, uint16_t height,
                                uint32_t stride,
                                dma_addr_t phyaddr_0, dma_addr_t phyaddr_1,
                                uint32_t u, uint32_t v)
{
        uint32_t reg;
        uint32_t dma_chan;

        dma_chan = channel_2_dma(channel, type);
        if (!idma_is_valid(dma_chan))
                return -EINVAL;

        if (stride < width * bytes_per_pixel(pixel_fmt))
                stride = width * bytes_per_pixel(pixel_fmt);

        if (stride % 4) {
                printf(
                        "Stride not 32-bit aligned, stride = %d\n", stride);
                return -EINVAL;
        }
        /* Build parameter memory data for DMA channel */
        ipu_ch_param_init(dma_chan, pixel_fmt, width, height, stride, u, v, 0,
                           phyaddr_0, phyaddr_1);

        if (ipu_is_dmfc_chan(dma_chan)) {
                ipu_dmfc_set_wait4eot(dma_chan, width);
        }

        if (idma_is_set(IDMAC_CHA_PRI, dma_chan))
                ipu_ch_param_set_high_priority(dma_chan);

        ipu_ch_param_dump(dma_chan);

        reg = __raw_readl(IPU_CHA_DB_MODE_SEL(dma_chan));
        if (phyaddr_1)
                reg |= idma_mask(dma_chan);
        else
                reg &= ~idma_mask(dma_chan);
        __raw_writel(reg, IPU_CHA_DB_MODE_SEL(dma_chan));

        /* Reset to buffer 0 */
        __raw_writel(idma_mask(dma_chan), IPU_CHA_CUR_BUF(dma_chan));

        return 0;
}

/*
 * This function enables a logical channel.
 *
 * @param       channel         Input parameter for the logical channel ID.
 *
 * @return      This function returns 0 on success or negative error code on
 *              fail.
 */
int32_t ipu_enable_channel(ipu_channel_t channel)
{
        uint32_t reg;
        uint32_t in_dma;
        uint32_t out_dma;

        if (g_channel_enable_mask & (1L << IPU_CHAN_ID(channel))) {
                printf("Warning: channel already enabled %d\n",
                        IPU_CHAN_ID(channel));
        }

        /* Get input and output dma channels */
        out_dma = channel_2_dma(channel, IPU_OUTPUT_BUFFER);
        in_dma = channel_2_dma(channel, IPU_VIDEO_IN_BUFFER);

        if (idma_is_valid(in_dma)) {
                reg = __raw_readl(IDMAC_CHA_EN(in_dma));
                __raw_writel(reg | idma_mask(in_dma), IDMAC_CHA_EN(in_dma));
        }
        if (idma_is_valid(out_dma)) {
                reg = __raw_readl(IDMAC_CHA_EN(out_dma));
                __raw_writel(reg | idma_mask(out_dma), IDMAC_CHA_EN(out_dma));
        }

        if ((channel == MEM_DC_SYNC) || (channel == MEM_BG_SYNC) ||
            (channel == MEM_FG_SYNC))
                ipu_dp_dc_enable(channel);

        g_channel_enable_mask |= 1L << IPU_CHAN_ID(channel);

        return 0;
}

/*
 * This function clear buffer ready for a logical channel.
 *
 * @param       channel         Input parameter for the logical channel ID.
 *
 * @param       type            Input parameter which buffer to clear.
 *
 * @param       bufNum          Input parameter for which buffer number clear
 *                              ready state.
 *
 */
void ipu_clear_buffer_ready(ipu_channel_t channel, ipu_buffer_t type,
                uint32_t bufNum)
{
        uint32_t dma_ch = channel_2_dma(channel, type);

        if (!idma_is_valid(dma_ch))
                return;

        __raw_writel(0xF0000000, IPU_GPR); /* write one to clear */
        if (bufNum == 0) {
                if (idma_is_set(IPU_CHA_BUF0_RDY, dma_ch)) {
                        __raw_writel(idma_mask(dma_ch),
                                        IPU_CHA_BUF0_RDY(dma_ch));
                }
        } else {
                if (idma_is_set(IPU_CHA_BUF1_RDY, dma_ch)) {
                        __raw_writel(idma_mask(dma_ch),
                                        IPU_CHA_BUF1_RDY(dma_ch));
                }
        }
        __raw_writel(0x0, IPU_GPR); /* write one to set */
}

/*
 * This function disables a logical channel.
 *
 * @param       channel         Input parameter for the logical channel ID.
 *
 * @param       wait_for_stop   Flag to set whether to wait for channel end
 *                              of frame or return immediately.
 *
 * @return      This function returns 0 on success or negative error code on
 *              fail.
 */
int32_t ipu_disable_channel(ipu_channel_t channel)
{
        uint32_t reg;
        uint32_t in_dma;
        uint32_t out_dma;

        if ((g_channel_enable_mask & (1L << IPU_CHAN_ID(channel))) == 0) {
                debug("Channel already disabled %d\n",
                        IPU_CHAN_ID(channel));
                return 0;
        }

        /* Get input and output dma channels */
        out_dma = channel_2_dma(channel, IPU_OUTPUT_BUFFER);
        in_dma = channel_2_dma(channel, IPU_VIDEO_IN_BUFFER);

        if ((idma_is_valid(in_dma) &&
                !idma_is_set(IDMAC_CHA_EN, in_dma))
                && (idma_is_valid(out_dma) &&
                !idma_is_set(IDMAC_CHA_EN, out_dma)))
                return -EINVAL;

        if ((channel == MEM_BG_SYNC) || (channel == MEM_FG_SYNC) ||
            (channel == MEM_DC_SYNC)) {
                ipu_dp_dc_disable(channel, 0);
        }

        /* Disable DMA channel(s) */
        if (idma_is_valid(in_dma)) {
                reg = __raw_readl(IDMAC_CHA_EN(in_dma));
                __raw_writel(reg & ~idma_mask(in_dma), IDMAC_CHA_EN(in_dma));
                __raw_writel(idma_mask(in_dma), IPU_CHA_CUR_BUF(in_dma));
        }
        if (idma_is_valid(out_dma)) {
                reg = __raw_readl(IDMAC_CHA_EN(out_dma));
                __raw_writel(reg & ~idma_mask(out_dma), IDMAC_CHA_EN(out_dma));
                __raw_writel(idma_mask(out_dma), IPU_CHA_CUR_BUF(out_dma));
        }

        g_channel_enable_mask &= ~(1L << IPU_CHAN_ID(channel));

        /* Set channel buffers NOT to be ready */
        if (idma_is_valid(in_dma)) {
                ipu_clear_buffer_ready(channel, IPU_VIDEO_IN_BUFFER, 0);
                ipu_clear_buffer_ready(channel, IPU_VIDEO_IN_BUFFER, 1);
        }
        if (idma_is_valid(out_dma)) {
                ipu_clear_buffer_ready(channel, IPU_OUTPUT_BUFFER, 0);
                ipu_clear_buffer_ready(channel, IPU_OUTPUT_BUFFER, 1);
        }

        return 0;
}

uint32_t bytes_per_pixel(uint32_t fmt)
{
        switch (fmt) {
        case IPU_PIX_FMT_GENERIC:       /*generic data */
        case IPU_PIX_FMT_RGB332:
        case IPU_PIX_FMT_YUV420P:
        case IPU_PIX_FMT_YUV422P:
                return 1;
                break;
        case IPU_PIX_FMT_RGB565:
        case IPU_PIX_FMT_YUYV:
        case IPU_PIX_FMT_UYVY:
                return 2;
                break;
        case IPU_PIX_FMT_BGR24:
        case IPU_PIX_FMT_RGB24:
                return 3;
                break;
        case IPU_PIX_FMT_GENERIC_32:    /*generic data */
        case IPU_PIX_FMT_BGR32:
        case IPU_PIX_FMT_BGRA32:
        case IPU_PIX_FMT_RGB32:
        case IPU_PIX_FMT_RGBA32:
        case IPU_PIX_FMT_ABGR32:
                return 4;
                break;
        default:
                return 1;
                break;
        }
        return 0;
}

ipu_color_space_t format_to_colorspace(uint32_t fmt)
{
        switch (fmt) {
        case IPU_PIX_FMT_RGB666:
        case IPU_PIX_FMT_RGB565:
        case IPU_PIX_FMT_BGR24:
        case IPU_PIX_FMT_RGB24:
        case IPU_PIX_FMT_BGR32:
        case IPU_PIX_FMT_BGRA32:
        case IPU_PIX_FMT_RGB32:
        case IPU_PIX_FMT_RGBA32:
        case IPU_PIX_FMT_ABGR32:
        case IPU_PIX_FMT_LVDS666:
        case IPU_PIX_FMT_LVDS888:
                return RGB;
                break;

        default:
                return YCbCr;
                break;
        }
        return RGB;
}

/* should be removed when clk framework is availiable */
int ipu_set_ldb_clock(int rate)
{
        ldb_clk.rate = rate;

        return 0;
}

bool ipu_clk_enabled(void)
{
        return g_ipu_clk_enabled;
}