diff options
Diffstat (limited to 'drivers/media/video/mxc/capture/mx27_csi.c')
| -rw-r--r-- | drivers/media/video/mxc/capture/mx27_csi.c | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/drivers/media/video/mxc/capture/mx27_csi.c b/drivers/media/video/mxc/capture/mx27_csi.c new file mode 100644 index 000000000000..24fce05be110 --- /dev/null +++ b/drivers/media/video/mxc/capture/mx27_csi.c @@ -0,0 +1,333 @@ +/* + * Copyright 2005-2009 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +/*! + * @file mx27_csi.c + * + * @brief CMOS Sensor interface functions + * + * @ingroup CSI + */ +#include <linux/types.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <mach/clock.h> +#include <mach/hardware.h> + +#include "mx27_csi.h" + +static csi_config_t g_csi_cfg; /* csi hardware configuration */ +static bool gcsi_mclk_on = false; +static csi_irq_callback_t g_callback = 0; +static void *g_callback_data = 0; +static struct clk csi_mclk; + +static irqreturn_t csi_irq_handler(int irq, void *data) +{ + unsigned long status = __raw_readl(CSI_CSISR); + + __raw_writel(status, CSI_CSISR); + if (g_callback) + g_callback(g_callback_data, status); + + pr_debug("CSI status = 0x%08lX\n", status); + + return IRQ_HANDLED; +} + +static void csihw_set_config(csi_config_t * cfg) +{ + unsigned val = 0; + + /* control reg 1 */ + val |= cfg->swap16_en ? BIT_SWAP16_EN : 0; + val |= cfg->ext_vsync ? BIT_EXT_VSYNC : 0; + val |= cfg->eof_int_en ? BIT_EOF_INT_EN : 0; + val |= cfg->prp_if_en ? BIT_PRP_IF_EN : 0; + val |= cfg->ccir_mode ? BIT_CCIR_MODE : 0; + val |= cfg->cof_int_en ? BIT_COF_INT_EN : 0; + val |= cfg->sf_or_inten ? BIT_SF_OR_INTEN : 0; + val |= cfg->rf_or_inten ? BIT_RF_OR_INTEN : 0; + val |= cfg->statff_level << SHIFT_STATFF_LEVEL; + val |= cfg->staff_inten ? BIT_STATFF_INTEN : 0; + val |= cfg->rxff_level << SHIFT_RXFF_LEVEL; + val |= cfg->rxff_inten ? BIT_RXFF_INTEN : 0; + val |= cfg->sof_pol ? BIT_SOF_POL : 0; + val |= cfg->sof_inten ? BIT_SOF_INTEN : 0; + val |= cfg->mclkdiv << SHIFT_MCLKDIV; + val |= cfg->hsync_pol ? BIT_HSYNC_POL : 0; + val |= cfg->ccir_en ? BIT_CCIR_EN : 0; + val |= cfg->mclken ? BIT_MCLKEN : 0; + val |= cfg->fcc ? BIT_FCC : 0; + val |= cfg->pack_dir ? BIT_PACK_DIR : 0; + val |= cfg->gclk_mode ? BIT_GCLK_MODE : 0; + val |= cfg->inv_data ? BIT_INV_DATA : 0; + val |= cfg->inv_pclk ? BIT_INV_PCLK : 0; + val |= cfg->redge ? BIT_REDGE : 0; + + __raw_writel(val, CSI_CSICR1); + + /* control reg 3 */ + val = 0x0; + val |= cfg->csi_sup ? BIT_CSI_SUP : 0; + val |= cfg->zero_pack_en ? BIT_ZERO_PACK_EN : 0; + val |= cfg->ecc_int_en ? BIT_ECC_INT_EN : 0; + val |= cfg->ecc_auto_en ? BIT_ECC_AUTO_EN : 0; + + __raw_writel(val, CSI_CSICR3); + + /* rxfifo counter */ + __raw_writel(cfg->rxcnt, CSI_CSIRXCNT); + + /* update global config */ + memcpy(&g_csi_cfg, cfg, sizeof(csi_config_t)); +} + +static void csihw_reset_frame_count(void) +{ + __raw_writel(__raw_readl(CSI_CSICR3) | BIT_FRMCNT_RST, CSI_CSICR3); +} + +static void csihw_reset(void) +{ + csihw_reset_frame_count(); + __raw_writel(CSICR1_RESET_VAL, CSI_CSICR1); + __raw_writel(CSICR2_RESET_VAL, CSI_CSICR2); + __raw_writel(CSICR3_RESET_VAL, CSI_CSICR3); +} + +/*! + * csi_init_interface + * Sets initial values for the CSI registers. + * The width and height of the sensor and the actual frame size will be + * set to the same values. + * @param width Sensor width + * @param height Sensor height + * @param pixel_fmt pixel format + * @param sig csi_signal_cfg_t + * + * @return 0 for success, -EINVAL for error + */ +int32_t csi_init_interface(uint16_t width, uint16_t height, + uint32_t pixel_fmt, csi_signal_cfg_t sig) +{ + csi_config_t cfg; + + /* Set the CSI_SENS_CONF register remaining fields */ + cfg.swap16_en = 1; + cfg.ext_vsync = sig.ext_vsync; + cfg.eof_int_en = 0; + cfg.prp_if_en = 1; + cfg.ccir_mode = 0; + cfg.cof_int_en = 0; + cfg.sf_or_inten = 0; + cfg.rf_or_inten = 0; + cfg.statff_level = 0; + cfg.staff_inten = 0; + cfg.rxff_level = 2; + cfg.rxff_inten = 0; + cfg.sof_pol = 1; + cfg.sof_inten = 0; + cfg.mclkdiv = 0; + cfg.hsync_pol = 1; + cfg.ccir_en = 0; + cfg.mclken = gcsi_mclk_on ? 1 : 0; + cfg.fcc = 1; + cfg.pack_dir = 0; + cfg.gclk_mode = 1; + cfg.inv_data = sig.data_pol; + cfg.inv_pclk = sig.pixclk_pol; + cfg.redge = 1; + cfg.csicnt1_rsv = 0; + + /* control reg 3 */ + cfg.frmcnt = 0; + cfg.frame_reset = 0; + cfg.csi_sup = 0; + cfg.zero_pack_en = 0; + cfg.ecc_int_en = 0; + cfg.ecc_auto_en = 0; + + csihw_set_config(&cfg); + + return 0; +} + +/*! + * csi_enable_prpif + * Enable or disable CSI-PrP interface + * @param enable Non-zero to enable, zero to disable + */ +void csi_enable_prpif(uint32_t enable) +{ + if (enable) { + g_csi_cfg.prp_if_en = 1; + g_csi_cfg.sof_inten = 0; + g_csi_cfg.pack_dir = 0; + } else { + g_csi_cfg.prp_if_en = 0; + g_csi_cfg.sof_inten = 1; + g_csi_cfg.pack_dir = 1; + } + + csihw_set_config(&g_csi_cfg); +} + +/*! + * csi_enable_mclk + * + * @param src enum define which source to control the clk + * CSI_MCLK_VF CSI_MCLK_ENC CSI_MCLK_RAW CSI_MCLK_I2C + * @param flag true to enable mclk, false to disable mclk + * @param wait true to wait 100ms make clock stable, false not wait + * + * @return 0 for success + */ +int32_t csi_enable_mclk(int src, bool flag, bool wait) +{ + if (flag == true) { + clk_enable(&csi_mclk); + if (wait == true) + msleep(10); + pr_debug("Enable csi clock from source %d\n", src); + gcsi_mclk_on = true; + } else { + clk_disable(&csi_mclk); + pr_debug("Disable csi clock from source %d\n", src); + gcsi_mclk_on = false; + } + + return 0; +} + +/*! + * csi_read_mclk_flag + * + * @return gcsi_mclk_source + */ +int csi_read_mclk_flag(void) +{ + return 0; +} + +void csi_set_callback(csi_irq_callback_t callback, void *data) +{ + g_callback = callback; + g_callback_data = data; +} + +static void _mclk_recalc(struct clk *clk) +{ + u32 div; + + div = (__raw_readl(CSI_CSICR1) & BIT_MCLKDIV) >> SHIFT_MCLKDIV; + div = (div + 1) * 2; + + clk->rate = clk->parent->rate / div; +} + +static unsigned long _mclk_round_rate(struct clk *clk, unsigned long rate) +{ + /* Keep CSI divider and change parent clock */ + if (clk->parent->round_rate) { + return clk->parent->round_rate(clk->parent, rate * 2); + } + return 0; +} + +static int _mclk_set_rate(struct clk *clk, unsigned long rate) +{ + int ret = -EINVAL; + + /* Keep CSI divider and change parent clock */ + if (clk->parent->set_rate) { + ret = clk->parent->set_rate(clk->parent, rate * 2); + if (ret == 0) { + clk->rate = clk->parent->rate / 2; + } + } + + return ret; +} + +static int _mclk_enable(struct clk *clk) +{ + __raw_writel(__raw_readl(CSI_CSICR1) | BIT_MCLKEN, CSI_CSICR1); + return 0; +} + +static void _mclk_disable(struct clk *clk) +{ + __raw_writel(__raw_readl(CSI_CSICR1) & ~BIT_MCLKEN, CSI_CSICR1); +} + +static struct clk csi_mclk = { + .name = "csi_clk", + .recalc = _mclk_recalc, + .round_rate = _mclk_round_rate, + .set_rate = _mclk_set_rate, + .enable = _mclk_enable, + .disable = _mclk_disable, +}; + +int32_t __init csi_init_module(void) +{ + int ret = 0; + struct clk *per_clk; + + per_clk = clk_get(NULL, "csi_perclk"); + if (IS_ERR(per_clk)) + return PTR_ERR(per_clk); + clk_put(per_clk); + csi_mclk.parent = per_clk; + clk_register(&csi_mclk); + clk_enable(per_clk); + csi_mclk.recalc(&csi_mclk); + + csihw_reset(); + + /* interrupt enable */ + ret = request_irq(MXC_INT_CSI, csi_irq_handler, 0, "csi", 0); + if (ret) + pr_debug("CSI error: irq request fail\n"); + + return ret; +} + +void __exit csi_cleanup_module(void) +{ + /* free irq */ + free_irq(MXC_INT_CSI, 0); + + clk_disable(&csi_mclk); +} + +module_init(csi_init_module); +module_exit(csi_cleanup_module); + +EXPORT_SYMBOL(csi_init_interface); +EXPORT_SYMBOL(csi_enable_mclk); +EXPORT_SYMBOL(csi_read_mclk_flag); +EXPORT_SYMBOL(csi_set_callback); +EXPORT_SYMBOL(csi_enable_prpif); + +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_DESCRIPTION("MX27 CSI driver"); +MODULE_LICENSE("GPL"); |