diff options
Diffstat (limited to 'drivers/media/i2c/ccs-pll.h')
| -rw-r--r-- | drivers/media/i2c/ccs-pll.h | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/drivers/media/i2c/ccs-pll.h b/drivers/media/i2c/ccs-pll.h new file mode 100644 index 000000000..6eb1b1c68 --- /dev/null +++ b/drivers/media/i2c/ccs-pll.h @@ -0,0 +1,214 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * drivers/media/i2c/ccs-pll.h + * + * Generic MIPI CCS/SMIA/SMIA++ PLL calculator + * + * Copyright (C) 2020 Intel Corporation + * Copyright (C) 2012 Nokia Corporation + * Contact: Sakari Ailus <sakari.ailus@linux.intel.com> + */ + +#ifndef CCS_PLL_H +#define CCS_PLL_H + +#include <linux/bits.h> + +/* CSI-2 or CCP-2 */ +#define CCS_PLL_BUS_TYPE_CSI2_DPHY 0x00 +#define CCS_PLL_BUS_TYPE_CSI2_CPHY 0x01 + +/* Old SMIA and implementation specific flags */ +/* op pix clock is for all lanes in total normally */ +#define CCS_PLL_FLAG_OP_PIX_CLOCK_PER_LANE BIT(0) +#define CCS_PLL_FLAG_NO_OP_CLOCKS BIT(1) +/* CCS PLL flags */ +#define CCS_PLL_FLAG_LANE_SPEED_MODEL BIT(2) +#define CCS_PLL_FLAG_LINK_DECOUPLED BIT(3) +#define CCS_PLL_FLAG_EXT_IP_PLL_DIVIDER BIT(4) +#define CCS_PLL_FLAG_FLEXIBLE_OP_PIX_CLK_DIV BIT(5) +#define CCS_PLL_FLAG_FIFO_DERATING BIT(6) +#define CCS_PLL_FLAG_FIFO_OVERRATING BIT(7) +#define CCS_PLL_FLAG_DUAL_PLL BIT(8) +#define CCS_PLL_FLAG_OP_SYS_DDR BIT(9) +#define CCS_PLL_FLAG_OP_PIX_DDR BIT(10) + +/** + * struct ccs_pll_branch_fr - CCS PLL configuration (front) + * + * A single branch front-end of the CCS PLL tree. + * + * @pre_pll_clk_div: Pre-PLL clock divisor + * @pll_multiplier: PLL multiplier + * @pll_ip_clk_freq_hz: PLL input clock frequency + * @pll_op_clk_freq_hz: PLL output clock frequency + */ +struct ccs_pll_branch_fr { + u16 pre_pll_clk_div; + u16 pll_multiplier; + u32 pll_ip_clk_freq_hz; + u32 pll_op_clk_freq_hz; +}; + +/** + * struct ccs_pll_branch_bk - CCS PLL configuration (back) + * + * A single branch back-end of the CCS PLL tree. + * + * @sys_clk_div: System clock divider + * @pix_clk_div: Pixel clock divider + * @sys_clk_freq_hz: System clock frequency + * @pix_clk_freq_hz: Pixel clock frequency + */ +struct ccs_pll_branch_bk { + u16 sys_clk_div; + u16 pix_clk_div; + u32 sys_clk_freq_hz; + u32 pix_clk_freq_hz; +}; + +/** + * struct ccs_pll - Full CCS PLL configuration + * + * All information required to calculate CCS PLL configuration. + * + * @bus_type: Type of the data bus, CCS_PLL_BUS_TYPE_* (input) + * @op_lanes: Number of operational lanes (input) + * @vt_lanes: Number of video timing lanes (input) + * @csi2: CSI-2 related parameters + * @csi2.lanes: The number of the CSI-2 data lanes (input) + * @binning_vertical: Vertical binning factor (input) + * @binning_horizontal: Horizontal binning factor (input) + * @scale_m: Downscaling factor, M component, [16, max] (input) + * @scale_n: Downscaling factor, N component, typically 16 (input) + * @bits_per_pixel: Bits per pixel on the output data bus (input) + * @op_bits_per_lane: Number of bits per OP lane (input) + * @flags: CCS_PLL_FLAG_* (input) + * @link_freq: Chosen link frequency (input) + * @ext_clk_freq_hz: External clock frequency, i.e. the sensor's input clock + * (input) + * @vt_fr: Video timing front-end configuration (output) + * @vt_bk: Video timing back-end configuration (output) + * @op_fr: Operational timing front-end configuration (output) + * @op_bk: Operational timing back-end configuration (output) + * @pixel_rate_csi: Pixel rate on the output data bus (output) + * @pixel_rate_pixel_array: Nominal pixel rate in the sensor's pixel array + * (output) + */ +struct ccs_pll { + /* input values */ + u8 bus_type; + u8 op_lanes; + u8 vt_lanes; + struct { + u8 lanes; + } csi2; + u8 binning_horizontal; + u8 binning_vertical; + u8 scale_m; + u8 scale_n; + u8 bits_per_pixel; + u8 op_bits_per_lane; + u16 flags; + u32 link_freq; + u32 ext_clk_freq_hz; + + /* output values */ + struct ccs_pll_branch_fr vt_fr; + struct ccs_pll_branch_bk vt_bk; + struct ccs_pll_branch_fr op_fr; + struct ccs_pll_branch_bk op_bk; + + u32 pixel_rate_csi; + u32 pixel_rate_pixel_array; +}; + +/** + * struct ccs_pll_branch_limits_fr - CCS PLL front-end limits + * + * @min_pre_pll_clk_div: Minimum pre-PLL clock divider + * @max_pre_pll_clk_div: Maximum pre-PLL clock divider + * @min_pll_ip_clk_freq_hz: Minimum PLL input clock frequency + * @max_pll_ip_clk_freq_hz: Maximum PLL input clock frequency + * @min_pll_multiplier: Minimum PLL multiplier + * @max_pll_multiplier: Maximum PLL multiplier + * @min_pll_op_clk_freq_hz: Minimum PLL output clock frequency + * @max_pll_op_clk_freq_hz: Maximum PLL output clock frequency + */ +struct ccs_pll_branch_limits_fr { + u16 min_pre_pll_clk_div; + u16 max_pre_pll_clk_div; + u32 min_pll_ip_clk_freq_hz; + u32 max_pll_ip_clk_freq_hz; + u16 min_pll_multiplier; + u16 max_pll_multiplier; + u32 min_pll_op_clk_freq_hz; + u32 max_pll_op_clk_freq_hz; +}; + +/** + * struct ccs_pll_branch_limits_bk - CCS PLL back-end limits + * + * @min_sys_clk_div: Minimum system clock divider + * @max_sys_clk_div: Maximum system clock divider + * @min_sys_clk_freq_hz: Minimum system clock frequency + * @max_sys_clk_freq_hz: Maximum system clock frequency + * @min_pix_clk_div: Minimum pixel clock divider + * @max_pix_clk_div: Maximum pixel clock divider + * @min_pix_clk_freq_hz: Minimum pixel clock frequency + * @max_pix_clk_freq_hz: Maximum pixel clock frequency + */ +struct ccs_pll_branch_limits_bk { + u16 min_sys_clk_div; + u16 max_sys_clk_div; + u32 min_sys_clk_freq_hz; + u32 max_sys_clk_freq_hz; + u16 min_pix_clk_div; + u16 max_pix_clk_div; + u32 min_pix_clk_freq_hz; + u32 max_pix_clk_freq_hz; +}; + +/** + * struct ccs_pll_limits - CCS PLL limits + * + * @min_ext_clk_freq_hz: Minimum external clock frequency + * @max_ext_clk_freq_hz: Maximum external clock frequency + * @vt_fr: Video timing front-end limits + * @vt_bk: Video timing back-end limits + * @op_fr: Operational timing front-end limits + * @op_bk: Operational timing back-end limits + * @min_line_length_pck_bin: Minimum line length in pixels, with binning + * @min_line_length_pck: Minimum line length in pixels without binning + */ +struct ccs_pll_limits { + /* Strict PLL limits */ + u32 min_ext_clk_freq_hz; + u32 max_ext_clk_freq_hz; + + struct ccs_pll_branch_limits_fr vt_fr; + struct ccs_pll_branch_limits_bk vt_bk; + struct ccs_pll_branch_limits_fr op_fr; + struct ccs_pll_branch_limits_bk op_bk; + + /* Other relevant limits */ + u32 min_line_length_pck_bin; + u32 min_line_length_pck; +}; + +struct device; + +/** + * ccs_pll_calculate - Calculate CCS PLL configuration based on input parameters + * + * @dev: Device pointer, used for printing messages + * @limits: Limits specific to the sensor + * @pll: Given PLL configuration + * + * Calculate the CCS PLL configuration based on the limits as well as given + * device specific, system specific or user configured input data. + */ +int ccs_pll_calculate(struct device *dev, const struct ccs_pll_limits *limits, + struct ccs_pll *pll); + +#endif /* CCS_PLL_H */ |