/* * 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. */ #include <linux/delay.h> #include <linux/device.h> #include <linux/regulator/consumer.h> #include "isp.h" #include "ispreg.h" #include "ispcsiphy.h" static void csiphy_routing_cfg_3630(struct isp_csiphy *phy, enum isp_interface_type iface, bool ccp2_strobe) { u32 reg = isp_reg_readl( phy->isp, OMAP3_ISP_IOMEM_3630_CONTROL_CAMERA_PHY_CTRL, 0); u32 shift, mode; switch (iface) { default: /* Should not happen in practice, but let's keep the compiler happy. */ case ISP_INTERFACE_CCP2B_PHY1: reg &= ~OMAP3630_CONTROL_CAMERA_PHY_CTRL_CSI1_RX_SEL_PHY2; shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY1_SHIFT; break; case ISP_INTERFACE_CSI2C_PHY1: shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY1_SHIFT; mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_DPHY; break; case ISP_INTERFACE_CCP2B_PHY2: reg |= OMAP3630_CONTROL_CAMERA_PHY_CTRL_CSI1_RX_SEL_PHY2; shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY2_SHIFT; break; case ISP_INTERFACE_CSI2A_PHY2: shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY2_SHIFT; mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_DPHY; break; } /* Select data/clock or data/strobe mode for CCP2 */ if (iface == ISP_INTERFACE_CCP2B_PHY1 || iface == ISP_INTERFACE_CCP2B_PHY2) { if (ccp2_strobe) mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_CCP2_DATA_STROBE; else mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_CCP2_DATA_CLOCK; } reg &= ~(OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_MASK << shift); reg |= mode << shift; isp_reg_writel(phy->isp, reg, OMAP3_ISP_IOMEM_3630_CONTROL_CAMERA_PHY_CTRL, 0); } static void csiphy_routing_cfg_3430(struct isp_csiphy *phy, u32 iface, bool on, bool ccp2_strobe) { u32 csirxfe = OMAP343X_CONTROL_CSIRXFE_PWRDNZ | OMAP343X_CONTROL_CSIRXFE_RESET; /* Only the CCP2B on PHY1 is configurable. */ if (iface != ISP_INTERFACE_CCP2B_PHY1) return; if (!on) { isp_reg_writel(phy->isp, 0, OMAP3_ISP_IOMEM_343X_CONTROL_CSIRXFE, 0); return; } if (ccp2_strobe) csirxfe |= OMAP343X_CONTROL_CSIRXFE_SELFORM; isp_reg_writel(phy->isp, csirxfe, OMAP3_ISP_IOMEM_343X_CONTROL_CSIRXFE, 0); } /* * Configure OMAP 3 CSI PHY routing. * @phy: relevant phy device * @iface: ISP_INTERFACE_* * @on: power on or off * @ccp2_strobe: false: data/clock, true: data/strobe * * Note that the underlying routing configuration registers are part of the * control (SCM) register space and part of the CORE power domain on both 3430 * and 3630, so they will not hold their contents in off-mode. This isn't an * issue since the MPU power domain is forced on whilst the ISP is in use. */ static void csiphy_routing_cfg(struct isp_csiphy *phy, enum isp_interface_type iface, bool on, bool ccp2_strobe) { if (phy->isp->mmio_base[OMAP3_ISP_IOMEM_3630_CONTROL_CAMERA_PHY_CTRL] && on) return csiphy_routing_cfg_3630(phy, iface, ccp2_strobe); if (phy->isp->mmio_base[OMAP3_ISP_IOMEM_343X_CONTROL_CSIRXFE]) return csiphy_routing_cfg_3430(phy, iface, on, ccp2_strobe); } /* * 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) { dev_err(phy->isp->dev, "CSI2 CIO set power failed!\n"); return -EBUSY; } return 0; } /* * TCLK values are OK at their reset values */ #define TCLK_TERM 0 #define TCLK_MISS 1 #define TCLK_SETTLE 14 static int omap3isp_csiphy_config(struct isp_csiphy *phy) { struct isp_csi2_device *csi2 = phy->csi2; struct isp_pipeline *pipe = to_isp_pipeline(&csi2->subdev.entity); struct isp_v4l2_subdevs_group *subdevs = pipe->external->host_priv; struct isp_csiphy_lanes_cfg *lanes; int csi2_ddrclk_khz; unsigned int used_lanes = 0; unsigned int i; u32 reg; if (subdevs->interface == ISP_INTERFACE_CCP2B_PHY1 || subdevs->interface == ISP_INTERFACE_CCP2B_PHY2) lanes = &subdevs->bus.ccp2.lanecfg; else lanes = &subdevs->bus.csi2.lanecfg; /* 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; /* * The PHY configuration is lost in off mode, that's not an * issue since the MPU power domain is forced on whilst the * ISP is in use. */ csiphy_routing_cfg(phy, subdevs->interface, true, subdevs->bus.ccp2.phy_layer); /* DPHY timing configuration */ /* CSI-2 is DDR and we only count used lanes. */ csi2_ddrclk_khz = pipe->external_rate / 1000 / (2 * hweight32(used_lanes)) * pipe->external_width; reg = isp_reg_readl(csi2->isp, phy->phy_regs, ISPCSIPHY_REG0); reg &= ~(ISPCSIPHY_REG0_THS_TERM_MASK | ISPCSIPHY_REG0_THS_SETTLE_MASK); /* THS_TERM: Programmed value = ceil(12.5 ns/DDRClk period) - 1. */ reg |= (DIV_ROUND_UP(25 * csi2_ddrclk_khz, 2000000) - 1) << ISPCSIPHY_REG0_THS_TERM_SHIFT; /* THS_SETTLE: Programmed value = ceil(90 ns/DDRClk period) + 3. */ reg |= (DIV_ROUND_UP(90 * csi2_ddrclk_khz, 1000000) + 3) << ISPCSIPHY_REG0_THS_SETTLE_SHIFT; isp_reg_writel(csi2->isp, reg, phy->phy_regs, ISPCSIPHY_REG0); reg = isp_reg_readl(csi2->isp, phy->phy_regs, ISPCSIPHY_REG1); reg &= ~(ISPCSIPHY_REG1_TCLK_TERM_MASK | ISPCSIPHY_REG1_TCLK_MISS_MASK | ISPCSIPHY_REG1_TCLK_SETTLE_MASK); reg |= TCLK_TERM << ISPCSIPHY_REG1_TCLK_TERM_SHIFT; reg |= TCLK_MISS << ISPCSIPHY_REG1_TCLK_MISS_SHIFT; reg |= TCLK_SETTLE << ISPCSIPHY_REG1_TCLK_SETTLE_SHIFT; isp_reg_writel(csi2->isp, reg, phy->phy_regs, ISPCSIPHY_REG1); /* DPHY lane configuration */ reg = isp_reg_readl(csi2->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 |= (lanes->data[i].pol << ISPCSI2_PHY_CFG_DATA_POL_SHIFT(i + 1)); reg |= (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 |= lanes->clk.pol << ISPCSI2_PHY_CFG_CLOCK_POL_SHIFT; reg |= lanes->clk.pos << ISPCSI2_PHY_CFG_CLOCK_POSITION_SHIFT; isp_reg_writel(csi2->isp, reg, phy->cfg_regs, ISPCSI2_PHY_CFG); 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; rval = omap3isp_csi2_reset(phy->csi2); if (rval < 0) goto done; rval = omap3isp_csiphy_config(phy); if (rval < 0) goto done; 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) { struct isp_csi2_device *csi2 = phy->csi2; struct isp_pipeline *pipe = to_isp_pipeline(&csi2->subdev.entity); struct isp_v4l2_subdevs_group *subdevs = pipe->external->host_priv; csiphy_routing_cfg(phy, subdevs->interface, false, subdevs->bus.ccp2.phy_layer); 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; 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; }