MX51: Add IPU driver for video support

The patch is a porting of the IPU Linux driver
developed by Freescale to have framebuffer
functionalities in u-boot. The port is based on
kernel 2.6.31 commit cc4fe714041805997b601fe8e5dd585d8a99297f,
as delivered by Freescale [i.MX BSP].
Most features are dropped from the original driver and
only LCD support is the goal of this porting.

Signed-off-by: Stefano Babic <sbabic@denx.de>

1 files changed, 1183 insertions, 0 deletions

diff --git a/drivers/video/ipu_common.c b/drivers/video/ipu_common.c
new file mode 100644
index 0000000..9d20c86
--- /dev/null
+++ b/drivers/video/ipu_common.c
@@ -0,0 +1,1183 @@
+/*
+ * 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.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* #define DEBUG */
+#include <common.h>
+#include <linux/types.h>
+#include <linux/err.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/crm_regs.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; \
+})
+
+
+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);
+
+	/* 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);
+
+	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);
+
+	/*
+	 * 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);
+}
+
+
+static struct clk ipu_clk = {
+	.name = "ipu_clk",
+	.rate = 133000000,
+	.enable_reg = (u32 *)(MXC_CCM_BASE +
+		offsetof(struct mxc_ccm_reg, CCGR5)),
+	.enable_shift = MXC_CCM_CCGR5_CG5_OFFSET,
+	.enable = clk_ipu_enable,
+	.disable = clk_ipu_disable,
+	.usecount = 0,
+};
+
+/* Globals */
+struct clk *g_ipu_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 = __raw_readl(DI_BS_CLKGEN0(clk->id));
+	if (div == 0)
+		clk->rate = 0;
+	else
+		clk->rate = (clk->parent->rate * 16) / div;
+}
+
+static unsigned long ipu_pixel_clk_round_rate(struct clk *clk,
+	unsigned long rate)
+{
+	u32 div, div1;
+	u32 tmp;
+	/*
+	 * Calculate divider
+	 * Fractional part is 4 bits,
+	 * so simply multiply by 2^4 to get fractional part.
+	 */
+	tmp = (clk->parent->rate * 16);
+	div = tmp / rate;
+
+	if (div < 0x10)            /* Min DI disp clock divider is 1 */
+		div = 0x10;
+	if (div & ~0xFEF)
+		div &= 0xFF8;
+	else {
+		div1 = div & 0xFE0;
+		if ((tmp/div1 - tmp/div) < rate / 4)
+			div = div1;
+		else
+			div &= 0xFF8;
+	}
+	return (clk->parent->rate * 16) / div;
+}
+
+static int ipu_pixel_clk_set_rate(struct clk *clk, unsigned long rate)
+{
+	u32 div = (clk->parent->rate * 16) / rate;
+
+	__raw_writel(div, DI_BS_CLKGEN0(clk->id));
+
+	/* Setup pixel clock timing */
+	__raw_writel((div / 16) << 16, DI_BS_CLKGEN1(clk->id));
+
+	clk->rate = (clk->parent->rate * 16) / div;
+	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_di_clk[clk->id])
+		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
+ */
+void ipu_reset(void)
+{
+	u32 *reg;
+	u32 value;
+
+	reg = (u32 *)SRC_BASE_ADDR;
+	value = __raw_readl(reg);
+	value = value | SW_IPU_RST;
+	__raw_writel(value, reg);
+}
+
+/*
+ * 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;
+	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);
+
+	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;
+	debug("ipu_clk = %u\n", clk_get_rate(g_ipu_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;
+}