drivers/media/video/davinci/vpif.c - kernel/prism - Git at Google

 /*
  * vpif - DM646x Video Port Interface driver
  * VPIF is a receiver and transmitter for video data. It has two channels(0, 1)
  * that receiveing video byte stream and two channels(2, 3) for video output.
  * The hardware supports SDTV, HDTV formats, raw data capture.
  * Currently, the driver supports NTSC and PAL standards.
  *
  * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
  *
  * 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 version 2.
  *
  * This program is distributed .as is. WITHOUT ANY WARRANTY of any
  * kind, whether express or implied; without even the implied warranty
  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/spinlock.h>
 #include <linux/kernel.h>
 #include <linux/io.h>
 #include <mach/hardware.h>

 #include "vpif.h"

 MODULE_DESCRIPTION("TI DaVinci Video Port Interface driver");
 MODULE_LICENSE("GPL");

 #define VPIF_CH0_MAX_MODES	(22)
 #define VPIF_CH1_MAX_MODES	(02)
 #define VPIF_CH2_MAX_MODES	(15)
 #define VPIF_CH3_MAX_MODES	(02)

 static resource_size_t	res_len;
 static struct resource	*res;
 spinlock_t vpif_lock;

 void __iomem *vpif_base;

 static inline void vpif_wr_bit(u32 reg, u32 bit, u32 val)
 {
 	if (val)
 		vpif_set_bit(reg, bit);
 	else
 		vpif_clr_bit(reg, bit);
 }

 /* This structure is used to keep track of VPIF size register's offsets */
 struct vpif_registers {
 	u32 h_cfg, v_cfg_00, v_cfg_01, v_cfg_02, v_cfg, ch_ctrl;
 	u32 line_offset, vanc0_strt, vanc0_size, vanc1_strt;
 	u32 vanc1_size, width_mask, len_mask;
 	u8 max_modes;
 };

 static const struct vpif_registers vpifregs[VPIF_NUM_CHANNELS] = {
 	/* Channel0 */
 	{
 		VPIF_CH0_H_CFG, VPIF_CH0_V_CFG_00, VPIF_CH0_V_CFG_01,
 		VPIF_CH0_V_CFG_02, VPIF_CH0_V_CFG_03, VPIF_CH0_CTRL,
 		VPIF_CH0_IMG_ADD_OFST, 0, 0, 0, 0, 0x1FFF, 0xFFF,
 		VPIF_CH0_MAX_MODES,
 	},
 	/* Channel1 */
 	{
 		VPIF_CH1_H_CFG, VPIF_CH1_V_CFG_00, VPIF_CH1_V_CFG_01,
 		VPIF_CH1_V_CFG_02, VPIF_CH1_V_CFG_03, VPIF_CH1_CTRL,
 		VPIF_CH1_IMG_ADD_OFST, 0, 0, 0, 0, 0x1FFF, 0xFFF,
 		VPIF_CH1_MAX_MODES,
 	},
 	/* Channel2 */
 	{
 		VPIF_CH2_H_CFG, VPIF_CH2_V_CFG_00, VPIF_CH2_V_CFG_01,
 		VPIF_CH2_V_CFG_02, VPIF_CH2_V_CFG_03, VPIF_CH2_CTRL,
 		VPIF_CH2_IMG_ADD_OFST, VPIF_CH2_VANC0_STRT, VPIF_CH2_VANC0_SIZE,
 		VPIF_CH2_VANC1_STRT, VPIF_CH2_VANC1_SIZE, 0x7FF, 0x7FF,
 		VPIF_CH2_MAX_MODES
 	},
 	/* Channel3 */
 	{
 		VPIF_CH3_H_CFG, VPIF_CH3_V_CFG_00, VPIF_CH3_V_CFG_01,
 		VPIF_CH3_V_CFG_02, VPIF_CH3_V_CFG_03, VPIF_CH3_CTRL,
 		VPIF_CH3_IMG_ADD_OFST, VPIF_CH3_VANC0_STRT, VPIF_CH3_VANC0_SIZE,
 		VPIF_CH3_VANC1_STRT, VPIF_CH3_VANC1_SIZE, 0x7FF, 0x7FF,
 		VPIF_CH3_MAX_MODES
 	},
 };

 /* vpif_set_mode_info:
  * This function is used to set horizontal and vertical config parameters
  * As per the standard in the channel, configure the values of L1, L3,
  * L5, L7  L9, L11 in VPIF Register , also write width and height
  */
 static void vpif_set_mode_info(const struct vpif_channel_config_params *config,
 				u8 channel_id, u8 config_channel_id)
 {
 	u32 value;

 	value = (config->eav2sav & vpifregs[config_channel_id].width_mask);
 	value <<= VPIF_CH_LEN_SHIFT;
 	value |= (config->sav2eav & vpifregs[config_channel_id].width_mask);
 	regw(value, vpifregs[channel_id].h_cfg);

 	value = (config->l1 & vpifregs[config_channel_id].len_mask);
 	value <<= VPIF_CH_LEN_SHIFT;
 	value |= (config->l3 & vpifregs[config_channel_id].len_mask);
 	regw(value, vpifregs[channel_id].v_cfg_00);

 	value = (config->l5 & vpifregs[config_channel_id].len_mask);
 	value <<= VPIF_CH_LEN_SHIFT;
 	value |= (config->l7 & vpifregs[config_channel_id].len_mask);
 	regw(value, vpifregs[channel_id].v_cfg_01);

 	value = (config->l9 & vpifregs[config_channel_id].len_mask);
 	value <<= VPIF_CH_LEN_SHIFT;
 	value |= (config->l11 & vpifregs[config_channel_id].len_mask);
 	regw(value, vpifregs[channel_id].v_cfg_02);

 	value = (config->vsize & vpifregs[config_channel_id].len_mask);
 	regw(value, vpifregs[channel_id].v_cfg);
 }

 /* config_vpif_params
  * Function to set the parameters of a channel
  * Mainly modifies the channel ciontrol register
  * It sets frame format, yc mux mode
  */
 static void config_vpif_params(struct vpif_params *vpifparams,
 				u8 channel_id, u8 found)
 {
 	const struct vpif_channel_config_params *config = &vpifparams->std_info;
 	u32 value, ch_nip, reg;
 	u8 start, end;
 	int i;

 	start = channel_id;
 	end = channel_id + found;

 	for (i = start; i < end; i++) {
 		reg = vpifregs[i].ch_ctrl;
 		if (channel_id < 2)
 			ch_nip = VPIF_CAPTURE_CH_NIP;
 		else
 			ch_nip = VPIF_DISPLAY_CH_NIP;

 		vpif_wr_bit(reg, ch_nip, config->frm_fmt);
 		vpif_wr_bit(reg, VPIF_CH_YC_MUX_BIT, config->ycmux_mode);
 		vpif_wr_bit(reg, VPIF_CH_INPUT_FIELD_FRAME_BIT,
 					vpifparams->video_params.storage_mode);

 		/* Set raster scanning SDR Format */
 		vpif_clr_bit(reg, VPIF_CH_SDR_FMT_BIT);
 		vpif_wr_bit(reg, VPIF_CH_DATA_MODE_BIT, config->capture_format);

 		if (channel_id > 1)	/* Set the Pixel enable bit */
 			vpif_set_bit(reg, VPIF_DISPLAY_PIX_EN_BIT);
 		else if (config->capture_format) {
 			/* Set the polarity of various pins */
 			vpif_wr_bit(reg, VPIF_CH_FID_POLARITY_BIT,
 					vpifparams->iface.fid_pol);
 			vpif_wr_bit(reg, VPIF_CH_V_VALID_POLARITY_BIT,
 					vpifparams->iface.vd_pol);
 			vpif_wr_bit(reg, VPIF_CH_H_VALID_POLARITY_BIT,
 					vpifparams->iface.hd_pol);

 			value = regr(reg);
 			/* Set data width */
 			value &= ((~(unsigned int)(0x3)) <<
 					VPIF_CH_DATA_WIDTH_BIT);
 			value |= ((vpifparams->params.data_sz) <<
 						     VPIF_CH_DATA_WIDTH_BIT);
 			regw(value, reg);
 		}

 		/* Write the pitch in the driver */
 		regw((vpifparams->video_params.hpitch),
 						vpifregs[i].line_offset);
 	}
 }

 /* vpif_set_video_params
  * This function is used to set video parameters in VPIF register
  */
 int vpif_set_video_params(struct vpif_params *vpifparams, u8 channel_id)
 {
 	const struct vpif_channel_config_params *config = &vpifparams->std_info;
 	int found = 1;

 	vpif_set_mode_info(config, channel_id, channel_id);
 	if (!config->ycmux_mode) {
 		/* YC are on separate channels (HDTV formats) */
 		vpif_set_mode_info(config, channel_id + 1, channel_id);
 		found = 2;
 	}

 	config_vpif_params(vpifparams, channel_id, found);

 	regw(0x80, VPIF_REQ_SIZE);
 	regw(0x01, VPIF_EMULATION_CTRL);

 	return found;
 }
 EXPORT_SYMBOL(vpif_set_video_params);

 void vpif_set_vbi_display_params(struct vpif_vbi_params *vbiparams,
 				u8 channel_id)
 {
 	u32 value;

 	value = 0x3F8 & (vbiparams->hstart0);
 	value |= 0x3FFFFFF & ((vbiparams->vstart0) << 16);
 	regw(value, vpifregs[channel_id].vanc0_strt);

 	value = 0x3F8 & (vbiparams->hstart1);
 	value |= 0x3FFFFFF & ((vbiparams->vstart1) << 16);
 	regw(value, vpifregs[channel_id].vanc1_strt);

 	value = 0x3F8 & (vbiparams->hsize0);
 	value |= 0x3FFFFFF & ((vbiparams->vsize0) << 16);
 	regw(value, vpifregs[channel_id].vanc0_size);

 	value = 0x3F8 & (vbiparams->hsize1);
 	value |= 0x3FFFFFF & ((vbiparams->vsize1) << 16);
 	regw(value, vpifregs[channel_id].vanc1_size);

 }
 EXPORT_SYMBOL(vpif_set_vbi_display_params);

 int vpif_channel_getfid(u8 channel_id)
 {
 	return (regr(vpifregs[channel_id].ch_ctrl) & VPIF_CH_FID_MASK)
 					>> VPIF_CH_FID_SHIFT;
 }
 EXPORT_SYMBOL(vpif_channel_getfid);

 static int __init vpif_probe(struct platform_device *pdev)
 {
 	int status = 0;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res)
 		return -ENOENT;

 	res_len = res->end - res->start + 1;

 	res = request_mem_region(res->start, res_len, res->name);
 	if (!res)
 		return -EBUSY;

 	vpif_base = ioremap(res->start, res_len);
 	if (!vpif_base) {
 		status = -EBUSY;
 		goto fail;
 	}

 	spin_lock_init(&vpif_lock);
 	dev_info(&pdev->dev, "vpif probe success\n");
 	return 0;

 fail:
 	release_mem_region(res->start, res_len);
 	return status;
 }

 static int vpif_remove(struct platform_device *pdev)
 {
 	iounmap(vpif_base);
 	release_mem_region(res->start, res_len);
 	return 0;
 }

 static struct platform_driver vpif_driver = {
 	.driver = {
 		.name	= "vpif",
 		.owner = THIS_MODULE,
 	},
 	.remove = __devexit_p(vpif_remove),
 	.probe = vpif_probe,
 };

 static void vpif_exit(void)
 {
 	platform_driver_unregister(&vpif_driver);
 }

 static int __init vpif_init(void)
 {
 	return platform_driver_register(&vpif_driver);
 }
 subsys_initcall(vpif_init);
 module_exit(vpif_exit);
	/*
	* vpif - DM646x Video Port Interface driver
	* VPIF is a receiver and transmitter for video data. It has two channels(0, 1)
	* that receiveing video byte stream and two channels(2, 3) for video output.
	* The hardware supports SDTV, HDTV formats, raw data capture.
	* Currently, the driver supports NTSC and PAL standards.
	*
	* Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
	*
	* 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 version 2.
	*
	* This program is distributed .as is. WITHOUT ANY WARRANTY of any
	* kind, whether express or implied; without even the implied warranty
	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/spinlock.h>
	#include <linux/kernel.h>
	#include <linux/io.h>
	#include <mach/hardware.h>

	#include "vpif.h"

	MODULE_DESCRIPTION("TI DaVinci Video Port Interface driver");
	MODULE_LICENSE("GPL");

	#define VPIF_CH0_MAX_MODES (22)
	#define VPIF_CH1_MAX_MODES (02)
	#define VPIF_CH2_MAX_MODES (15)
	#define VPIF_CH3_MAX_MODES (02)

	static resource_size_t res_len;
	static struct resource *res;
	spinlock_t vpif_lock;

	void __iomem *vpif_base;

	static inline void vpif_wr_bit(u32 reg, u32 bit, u32 val)
	{
	if (val)
	vpif_set_bit(reg, bit);
	else
	vpif_clr_bit(reg, bit);
	}

	/* This structure is used to keep track of VPIF size register's offsets */
	struct vpif_registers {
	u32 h_cfg, v_cfg_00, v_cfg_01, v_cfg_02, v_cfg, ch_ctrl;
	u32 line_offset, vanc0_strt, vanc0_size, vanc1_strt;
	u32 vanc1_size, width_mask, len_mask;
	u8 max_modes;
	};

	static const struct vpif_registers vpifregs[VPIF_NUM_CHANNELS] = {
	/* Channel0 */
	{
	VPIF_CH0_H_CFG, VPIF_CH0_V_CFG_00, VPIF_CH0_V_CFG_01,
	VPIF_CH0_V_CFG_02, VPIF_CH0_V_CFG_03, VPIF_CH0_CTRL,
	VPIF_CH0_IMG_ADD_OFST, 0, 0, 0, 0, 0x1FFF, 0xFFF,
	VPIF_CH0_MAX_MODES,
	},
	/* Channel1 */
	{
	VPIF_CH1_H_CFG, VPIF_CH1_V_CFG_00, VPIF_CH1_V_CFG_01,
	VPIF_CH1_V_CFG_02, VPIF_CH1_V_CFG_03, VPIF_CH1_CTRL,
	VPIF_CH1_IMG_ADD_OFST, 0, 0, 0, 0, 0x1FFF, 0xFFF,
	VPIF_CH1_MAX_MODES,
	},
	/* Channel2 */
	{
	VPIF_CH2_H_CFG, VPIF_CH2_V_CFG_00, VPIF_CH2_V_CFG_01,
	VPIF_CH2_V_CFG_02, VPIF_CH2_V_CFG_03, VPIF_CH2_CTRL,
	VPIF_CH2_IMG_ADD_OFST, VPIF_CH2_VANC0_STRT, VPIF_CH2_VANC0_SIZE,
	VPIF_CH2_VANC1_STRT, VPIF_CH2_VANC1_SIZE, 0x7FF, 0x7FF,
	VPIF_CH2_MAX_MODES
	},
	/* Channel3 */
	{
	VPIF_CH3_H_CFG, VPIF_CH3_V_CFG_00, VPIF_CH3_V_CFG_01,
	VPIF_CH3_V_CFG_02, VPIF_CH3_V_CFG_03, VPIF_CH3_CTRL,
	VPIF_CH3_IMG_ADD_OFST, VPIF_CH3_VANC0_STRT, VPIF_CH3_VANC0_SIZE,
	VPIF_CH3_VANC1_STRT, VPIF_CH3_VANC1_SIZE, 0x7FF, 0x7FF,
	VPIF_CH3_MAX_MODES
	},
	};

	/* vpif_set_mode_info:
	* This function is used to set horizontal and vertical config parameters
	* As per the standard in the channel, configure the values of L1, L3,
	* L5, L7 L9, L11 in VPIF Register , also write width and height
	*/
	static void vpif_set_mode_info(const struct vpif_channel_config_params *config,
	u8 channel_id, u8 config_channel_id)
	{
	u32 value;

	value = (config->eav2sav & vpifregs[config_channel_id].width_mask);
	value <<= VPIF_CH_LEN_SHIFT;
	value \|= (config->sav2eav & vpifregs[config_channel_id].width_mask);
	regw(value, vpifregs[channel_id].h_cfg);

	value = (config->l1 & vpifregs[config_channel_id].len_mask);
	value <<= VPIF_CH_LEN_SHIFT;
	value \|= (config->l3 & vpifregs[config_channel_id].len_mask);
	regw(value, vpifregs[channel_id].v_cfg_00);

	value = (config->l5 & vpifregs[config_channel_id].len_mask);
	value <<= VPIF_CH_LEN_SHIFT;
	value \|= (config->l7 & vpifregs[config_channel_id].len_mask);
	regw(value, vpifregs[channel_id].v_cfg_01);

	value = (config->l9 & vpifregs[config_channel_id].len_mask);
	value <<= VPIF_CH_LEN_SHIFT;
	value \|= (config->l11 & vpifregs[config_channel_id].len_mask);
	regw(value, vpifregs[channel_id].v_cfg_02);

	value = (config->vsize & vpifregs[config_channel_id].len_mask);
	regw(value, vpifregs[channel_id].v_cfg);
	}

	/* config_vpif_params
	* Function to set the parameters of a channel
	* Mainly modifies the channel ciontrol register
	* It sets frame format, yc mux mode
	*/
	static void config_vpif_params(struct vpif_params *vpifparams,
	u8 channel_id, u8 found)
	{
	const struct vpif_channel_config_params *config = &vpifparams->std_info;
	u32 value, ch_nip, reg;
	u8 start, end;
	int i;

	start = channel_id;
	end = channel_id + found;

	for (i = start; i < end; i++) {
	reg = vpifregs[i].ch_ctrl;
	if (channel_id < 2)
	ch_nip = VPIF_CAPTURE_CH_NIP;
	else
	ch_nip = VPIF_DISPLAY_CH_NIP;

	vpif_wr_bit(reg, ch_nip, config->frm_fmt);
	vpif_wr_bit(reg, VPIF_CH_YC_MUX_BIT, config->ycmux_mode);
	vpif_wr_bit(reg, VPIF_CH_INPUT_FIELD_FRAME_BIT,
	vpifparams->video_params.storage_mode);

	/* Set raster scanning SDR Format */
	vpif_clr_bit(reg, VPIF_CH_SDR_FMT_BIT);
	vpif_wr_bit(reg, VPIF_CH_DATA_MODE_BIT, config->capture_format);

	if (channel_id > 1) /* Set the Pixel enable bit */
	vpif_set_bit(reg, VPIF_DISPLAY_PIX_EN_BIT);
	else if (config->capture_format) {
	/* Set the polarity of various pins */
	vpif_wr_bit(reg, VPIF_CH_FID_POLARITY_BIT,
	vpifparams->iface.fid_pol);
	vpif_wr_bit(reg, VPIF_CH_V_VALID_POLARITY_BIT,
	vpifparams->iface.vd_pol);
	vpif_wr_bit(reg, VPIF_CH_H_VALID_POLARITY_BIT,
	vpifparams->iface.hd_pol);

	value = regr(reg);
	/* Set data width */
	value &= ((~(unsigned int)(0x3)) <<
	VPIF_CH_DATA_WIDTH_BIT);
	value \|= ((vpifparams->params.data_sz) <<
	VPIF_CH_DATA_WIDTH_BIT);
	regw(value, reg);
	}

	/* Write the pitch in the driver */
	regw((vpifparams->video_params.hpitch),
	vpifregs[i].line_offset);
	}
	}

	/* vpif_set_video_params
	* This function is used to set video parameters in VPIF register
	*/
	int vpif_set_video_params(struct vpif_params *vpifparams, u8 channel_id)
	{
	const struct vpif_channel_config_params *config = &vpifparams->std_info;
	int found = 1;

	vpif_set_mode_info(config, channel_id, channel_id);
	if (!config->ycmux_mode) {
	/* YC are on separate channels (HDTV formats) */
	vpif_set_mode_info(config, channel_id + 1, channel_id);
	found = 2;
	}

	config_vpif_params(vpifparams, channel_id, found);

	regw(0x80, VPIF_REQ_SIZE);
	regw(0x01, VPIF_EMULATION_CTRL);

	return found;
	}
	EXPORT_SYMBOL(vpif_set_video_params);

	void vpif_set_vbi_display_params(struct vpif_vbi_params *vbiparams,
	u8 channel_id)
	{
	u32 value;

	value = 0x3F8 & (vbiparams->hstart0);
	value \|= 0x3FFFFFF & ((vbiparams->vstart0) << 16);
	regw(value, vpifregs[channel_id].vanc0_strt);

	value = 0x3F8 & (vbiparams->hstart1);
	value \|= 0x3FFFFFF & ((vbiparams->vstart1) << 16);
	regw(value, vpifregs[channel_id].vanc1_strt);

	value = 0x3F8 & (vbiparams->hsize0);
	value \|= 0x3FFFFFF & ((vbiparams->vsize0) << 16);
	regw(value, vpifregs[channel_id].vanc0_size);

	value = 0x3F8 & (vbiparams->hsize1);
	value \|= 0x3FFFFFF & ((vbiparams->vsize1) << 16);
	regw(value, vpifregs[channel_id].vanc1_size);

	}
	EXPORT_SYMBOL(vpif_set_vbi_display_params);

	int vpif_channel_getfid(u8 channel_id)
	{
	return (regr(vpifregs[channel_id].ch_ctrl) & VPIF_CH_FID_MASK)
	>> VPIF_CH_FID_SHIFT;
	}
	EXPORT_SYMBOL(vpif_channel_getfid);

	static int __init vpif_probe(struct platform_device *pdev)
	{
	int status = 0;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
	return -ENOENT;

	res_len = res->end - res->start + 1;

	res = request_mem_region(res->start, res_len, res->name);
	if (!res)
	return -EBUSY;

	vpif_base = ioremap(res->start, res_len);
	if (!vpif_base) {
	status = -EBUSY;
	goto fail;
	}

	spin_lock_init(&vpif_lock);
	dev_info(&pdev->dev, "vpif probe success\n");
	return 0;

	fail:
	release_mem_region(res->start, res_len);
	return status;
	}

	static int vpif_remove(struct platform_device *pdev)
	{
	iounmap(vpif_base);
	release_mem_region(res->start, res_len);
	return 0;
	}

	static struct platform_driver vpif_driver = {
	.driver = {
	.name = "vpif",
	.owner = THIS_MODULE,
	},
	.remove = __devexit_p(vpif_remove),
	.probe = vpif_probe,
	};

	static void vpif_exit(void)
	{
	platform_driver_unregister(&vpif_driver);
	}

	static int __init vpif_init(void)
	{
	return platform_driver_register(&vpif_driver);
	}
	subsys_initcall(vpif_init);
	module_exit(vpif_exit);