diff options
Diffstat (limited to 'drivers/media/video/omap3isp/ispcsiphy.c')
| -rw-r--r-- | drivers/media/video/omap3isp/ispcsiphy.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/drivers/media/video/omap3isp/ispcsiphy.c b/drivers/media/video/omap3isp/ispcsiphy.c new file mode 100644 index 000000000000..5be37ce7d0c2 --- /dev/null +++ b/drivers/media/video/omap3isp/ispcsiphy.c @@ -0,0 +1,247 @@ +/* + * ispcsiphy.c + * + * TI OMAP3 ISP - CSI PHY module + * + * Copyright (C) 2010 Nokia Corporation + * Copyright (C) 2009 Texas Instruments, Inc. + * + * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> + * Sakari Ailus <sakari.ailus@iki.fi> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + */ + +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/regulator/consumer.h> + +#include "isp.h" +#include "ispreg.h" +#include "ispcsiphy.h" + +/* + * csiphy_lanes_config - Configuration of CSIPHY lanes. + * + * Updates HW configuration. + * Called with phy->mutex taken. + */ +static void csiphy_lanes_config(struct isp_csiphy *phy) +{ + unsigned int i; + u32 reg; + + reg = isp_reg_readl(phy->isp, phy->cfg_regs, ISPCSI2_PHY_CFG); + + for (i = 0; i < phy->num_data_lanes; i++) { + reg &= ~(ISPCSI2_PHY_CFG_DATA_POL_MASK(i + 1) | + ISPCSI2_PHY_CFG_DATA_POSITION_MASK(i + 1)); + reg |= (phy->lanes.data[i].pol << + ISPCSI2_PHY_CFG_DATA_POL_SHIFT(i + 1)); + reg |= (phy->lanes.data[i].pos << + ISPCSI2_PHY_CFG_DATA_POSITION_SHIFT(i + 1)); + } + + reg &= ~(ISPCSI2_PHY_CFG_CLOCK_POL_MASK | + ISPCSI2_PHY_CFG_CLOCK_POSITION_MASK); + reg |= phy->lanes.clk.pol << ISPCSI2_PHY_CFG_CLOCK_POL_SHIFT; + reg |= phy->lanes.clk.pos << ISPCSI2_PHY_CFG_CLOCK_POSITION_SHIFT; + + isp_reg_writel(phy->isp, reg, phy->cfg_regs, ISPCSI2_PHY_CFG); +} + +/* + * csiphy_power_autoswitch_enable + * @enable: Sets or clears the autoswitch function enable flag. + */ +static void csiphy_power_autoswitch_enable(struct isp_csiphy *phy, bool enable) +{ + isp_reg_clr_set(phy->isp, phy->cfg_regs, ISPCSI2_PHY_CFG, + ISPCSI2_PHY_CFG_PWR_AUTO, + enable ? ISPCSI2_PHY_CFG_PWR_AUTO : 0); +} + +/* + * csiphy_set_power + * @power: Power state to be set. + * + * Returns 0 if successful, or -EBUSY if the retry count is exceeded. + */ +static int csiphy_set_power(struct isp_csiphy *phy, u32 power) +{ + u32 reg; + u8 retry_count; + + isp_reg_clr_set(phy->isp, phy->cfg_regs, ISPCSI2_PHY_CFG, + ISPCSI2_PHY_CFG_PWR_CMD_MASK, power); + + retry_count = 0; + do { + udelay(50); + reg = isp_reg_readl(phy->isp, phy->cfg_regs, ISPCSI2_PHY_CFG) & + ISPCSI2_PHY_CFG_PWR_STATUS_MASK; + + if (reg != power >> 2) + retry_count++; + + } while ((reg != power >> 2) && (retry_count < 100)); + + if (retry_count == 100) { + printk(KERN_ERR "CSI2 CIO set power failed!\n"); + return -EBUSY; + } + + return 0; +} + +/* + * csiphy_dphy_config - Configure CSI2 D-PHY parameters. + * + * Called with phy->mutex taken. + */ +static void csiphy_dphy_config(struct isp_csiphy *phy) +{ + u32 reg; + + /* Set up ISPCSIPHY_REG0 */ + reg = isp_reg_readl(phy->isp, phy->phy_regs, ISPCSIPHY_REG0); + + reg &= ~(ISPCSIPHY_REG0_THS_TERM_MASK | + ISPCSIPHY_REG0_THS_SETTLE_MASK); + reg |= phy->dphy.ths_term << ISPCSIPHY_REG0_THS_TERM_SHIFT; + reg |= phy->dphy.ths_settle << ISPCSIPHY_REG0_THS_SETTLE_SHIFT; + + isp_reg_writel(phy->isp, reg, phy->phy_regs, ISPCSIPHY_REG0); + + /* Set up ISPCSIPHY_REG1 */ + reg = isp_reg_readl(phy->isp, phy->phy_regs, ISPCSIPHY_REG1); + + reg &= ~(ISPCSIPHY_REG1_TCLK_TERM_MASK | + ISPCSIPHY_REG1_TCLK_MISS_MASK | + ISPCSIPHY_REG1_TCLK_SETTLE_MASK); + reg |= phy->dphy.tclk_term << ISPCSIPHY_REG1_TCLK_TERM_SHIFT; + reg |= phy->dphy.tclk_miss << ISPCSIPHY_REG1_TCLK_MISS_SHIFT; + reg |= phy->dphy.tclk_settle << ISPCSIPHY_REG1_TCLK_SETTLE_SHIFT; + + isp_reg_writel(phy->isp, reg, phy->phy_regs, ISPCSIPHY_REG1); +} + +static int csiphy_config(struct isp_csiphy *phy, + struct isp_csiphy_dphy_cfg *dphy, + struct isp_csiphy_lanes_cfg *lanes) +{ + unsigned int used_lanes = 0; + unsigned int i; + + /* Clock and data lanes verification */ + for (i = 0; i < phy->num_data_lanes; i++) { + if (lanes->data[i].pol > 1 || lanes->data[i].pos > 3) + return -EINVAL; + + if (used_lanes & (1 << lanes->data[i].pos)) + return -EINVAL; + + used_lanes |= 1 << lanes->data[i].pos; + } + + if (lanes->clk.pol > 1 || lanes->clk.pos > 3) + return -EINVAL; + + if (lanes->clk.pos == 0 || used_lanes & (1 << lanes->clk.pos)) + return -EINVAL; + + mutex_lock(&phy->mutex); + phy->dphy = *dphy; + phy->lanes = *lanes; + mutex_unlock(&phy->mutex); + + return 0; +} + +int omap3isp_csiphy_acquire(struct isp_csiphy *phy) +{ + int rval; + + if (phy->vdd == NULL) { + dev_err(phy->isp->dev, "Power regulator for CSI PHY not " + "available\n"); + return -ENODEV; + } + + mutex_lock(&phy->mutex); + + rval = regulator_enable(phy->vdd); + if (rval < 0) + goto done; + + omap3isp_csi2_reset(phy->csi2); + + csiphy_dphy_config(phy); + csiphy_lanes_config(phy); + + rval = csiphy_set_power(phy, ISPCSI2_PHY_CFG_PWR_CMD_ON); + if (rval) { + regulator_disable(phy->vdd); + goto done; + } + + csiphy_power_autoswitch_enable(phy, true); + phy->phy_in_use = 1; + +done: + mutex_unlock(&phy->mutex); + return rval; +} + +void omap3isp_csiphy_release(struct isp_csiphy *phy) +{ + mutex_lock(&phy->mutex); + if (phy->phy_in_use) { + csiphy_power_autoswitch_enable(phy, false); + csiphy_set_power(phy, ISPCSI2_PHY_CFG_PWR_CMD_OFF); + regulator_disable(phy->vdd); + phy->phy_in_use = 0; + } + mutex_unlock(&phy->mutex); +} + +/* + * omap3isp_csiphy_init - Initialize the CSI PHY frontends + */ +int omap3isp_csiphy_init(struct isp_device *isp) +{ + struct isp_csiphy *phy1 = &isp->isp_csiphy1; + struct isp_csiphy *phy2 = &isp->isp_csiphy2; + + isp->platform_cb.csiphy_config = csiphy_config; + + phy2->isp = isp; + phy2->csi2 = &isp->isp_csi2a; + phy2->num_data_lanes = ISP_CSIPHY2_NUM_DATA_LANES; + phy2->cfg_regs = OMAP3_ISP_IOMEM_CSI2A_REGS1; + phy2->phy_regs = OMAP3_ISP_IOMEM_CSIPHY2; + mutex_init(&phy2->mutex); + + if (isp->revision == ISP_REVISION_15_0) { + phy1->isp = isp; + phy1->csi2 = &isp->isp_csi2c; + phy1->num_data_lanes = ISP_CSIPHY1_NUM_DATA_LANES; + phy1->cfg_regs = OMAP3_ISP_IOMEM_CSI2C_REGS1; + phy1->phy_regs = OMAP3_ISP_IOMEM_CSIPHY1; + mutex_init(&phy1->mutex); + } + + return 0; +} |