310 lines
11 KiB
C
310 lines
11 KiB
C
/*
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* TI clock drivers support
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*
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* Copyright (C) 2013 Texas Instruments, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __LINUX_CLK_TI_H__
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#define __LINUX_CLK_TI_H__
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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/**
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* struct clk_omap_reg - OMAP register declaration
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* @offset: offset from the master IP module base address
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* @index: index of the master IP module
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*/
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struct clk_omap_reg {
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void __iomem *ptr;
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u16 offset;
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u8 index;
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u8 flags;
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};
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/**
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* struct dpll_data - DPLL registers and integration data
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* @mult_div1_reg: register containing the DPLL M and N bitfields
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* @mult_mask: mask of the DPLL M bitfield in @mult_div1_reg
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* @div1_mask: mask of the DPLL N bitfield in @mult_div1_reg
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* @clk_bypass: struct clk_hw pointer to the clock's bypass clock input
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* @clk_ref: struct clk_hw pointer to the clock's reference clock input
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* @control_reg: register containing the DPLL mode bitfield
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* @enable_mask: mask of the DPLL mode bitfield in @control_reg
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* @last_rounded_rate: cache of the last rate result of omap2_dpll_round_rate()
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* @last_rounded_m: cache of the last M result of omap2_dpll_round_rate()
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* @last_rounded_m4xen: cache of the last M4X result of
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* omap4_dpll_regm4xen_round_rate()
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* @last_rounded_lpmode: cache of the last lpmode result of
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* omap4_dpll_lpmode_recalc()
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* @max_multiplier: maximum valid non-bypass multiplier value (actual)
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* @last_rounded_n: cache of the last N result of omap2_dpll_round_rate()
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* @min_divider: minimum valid non-bypass divider value (actual)
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* @max_divider: maximum valid non-bypass divider value (actual)
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* @max_rate: maximum clock rate for the DPLL
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* @modes: possible values of @enable_mask
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* @autoidle_reg: register containing the DPLL autoidle mode bitfield
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* @idlest_reg: register containing the DPLL idle status bitfield
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* @autoidle_mask: mask of the DPLL autoidle mode bitfield in @autoidle_reg
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* @freqsel_mask: mask of the DPLL jitter correction bitfield in @control_reg
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* @dcc_mask: mask of the DPLL DCC correction bitfield @mult_div1_reg
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* @dcc_rate: rate atleast which DCC @dcc_mask must be set
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* @idlest_mask: mask of the DPLL idle status bitfield in @idlest_reg
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* @lpmode_mask: mask of the DPLL low-power mode bitfield in @control_reg
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* @m4xen_mask: mask of the DPLL M4X multiplier bitfield in @control_reg
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* @auto_recal_bit: bitshift of the driftguard enable bit in @control_reg
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* @recal_en_bit: bitshift of the PRM_IRQENABLE_* bit for recalibration IRQs
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* @recal_st_bit: bitshift of the PRM_IRQSTATUS_* bit for recalibration IRQs
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* @flags: DPLL type/features (see below)
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*
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* Possible values for @flags:
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* DPLL_J_TYPE: "J-type DPLL" (only some 36xx, 4xxx DPLLs)
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*
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* @freqsel_mask is only used on the OMAP34xx family and AM35xx.
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*
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* XXX Some DPLLs have multiple bypass inputs, so it's not technically
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* correct to only have one @clk_bypass pointer.
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*
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* XXX The runtime-variable fields (@last_rounded_rate, @last_rounded_m,
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* @last_rounded_n) should be separated from the runtime-fixed fields
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* and placed into a different structure, so that the runtime-fixed data
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* can be placed into read-only space.
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*/
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struct dpll_data {
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struct clk_omap_reg mult_div1_reg;
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u32 mult_mask;
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u32 div1_mask;
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struct clk_hw *clk_bypass;
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struct clk_hw *clk_ref;
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struct clk_omap_reg control_reg;
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u32 enable_mask;
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unsigned long last_rounded_rate;
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u16 last_rounded_m;
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u8 last_rounded_m4xen;
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u8 last_rounded_lpmode;
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u16 max_multiplier;
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u8 last_rounded_n;
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u8 min_divider;
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u16 max_divider;
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unsigned long max_rate;
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u8 modes;
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struct clk_omap_reg autoidle_reg;
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struct clk_omap_reg idlest_reg;
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u32 autoidle_mask;
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u32 freqsel_mask;
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u32 idlest_mask;
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u32 dco_mask;
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u32 sddiv_mask;
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u32 dcc_mask;
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unsigned long dcc_rate;
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u32 lpmode_mask;
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u32 m4xen_mask;
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u8 auto_recal_bit;
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u8 recal_en_bit;
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u8 recal_st_bit;
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u8 flags;
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};
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struct clk_hw_omap;
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/**
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* struct clk_hw_omap_ops - OMAP clk ops
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* @find_idlest: find idlest register information for a clock
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* @find_companion: find companion clock register information for a clock,
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* basically converts CM_ICLKEN* <-> CM_FCLKEN*
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* @allow_idle: enables autoidle hardware functionality for a clock
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* @deny_idle: prevent autoidle hardware functionality for a clock
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*/
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struct clk_hw_omap_ops {
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void (*find_idlest)(struct clk_hw_omap *oclk,
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struct clk_omap_reg *idlest_reg,
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u8 *idlest_bit, u8 *idlest_val);
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void (*find_companion)(struct clk_hw_omap *oclk,
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struct clk_omap_reg *other_reg,
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u8 *other_bit);
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void (*allow_idle)(struct clk_hw_omap *oclk);
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void (*deny_idle)(struct clk_hw_omap *oclk);
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};
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/**
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* struct clk_hw_omap - OMAP struct clk
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* @node: list_head connecting this clock into the full clock list
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* @enable_reg: register to write to enable the clock (see @enable_bit)
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* @enable_bit: bitshift to write to enable/disable the clock (see @enable_reg)
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* @flags: see "struct clk.flags possibilities" above
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* @clksel_reg: for clksel clks, register va containing src/divisor select
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* @dpll_data: for DPLLs, pointer to struct dpll_data for this clock
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* @clkdm_name: clockdomain name that this clock is contained in
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* @clkdm: pointer to struct clockdomain, resolved from @clkdm_name at runtime
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* @ops: clock ops for this clock
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*/
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struct clk_hw_omap {
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struct clk_hw hw;
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struct list_head node;
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unsigned long fixed_rate;
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u8 fixed_div;
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struct clk_omap_reg enable_reg;
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u8 enable_bit;
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u8 flags;
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struct clk_omap_reg clksel_reg;
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struct dpll_data *dpll_data;
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const char *clkdm_name;
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struct clockdomain *clkdm;
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const struct clk_hw_omap_ops *ops;
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};
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/*
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* struct clk_hw_omap.flags possibilities
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*
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* XXX document the rest of the clock flags here
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*
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* ENABLE_REG_32BIT: (OMAP1 only) clock control register must be accessed
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* with 32bit ops, by default OMAP1 uses 16bit ops.
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* CLOCK_IDLE_CONTROL: (OMAP1 only) clock has autoidle support.
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* CLOCK_NO_IDLE_PARENT: (OMAP1 only) when clock is enabled, its parent
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* clock is put to no-idle mode.
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* ENABLE_ON_INIT: Clock is enabled on init.
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* INVERT_ENABLE: By default, clock enable bit behavior is '1' enable, '0'
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* disable. This inverts the behavior making '0' enable and '1' disable.
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* CLOCK_CLKOUTX2: (OMAP4 only) DPLL CLKOUT and CLKOUTX2 GATE_CTRL
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* bits share the same register. This flag allows the
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* omap4_dpllmx*() code to determine which GATE_CTRL bit field
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* should be used. This is a temporary solution - a better approach
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* would be to associate clock type-specific data with the clock,
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* similar to the struct dpll_data approach.
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*/
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#define ENABLE_REG_32BIT (1 << 0) /* Use 32-bit access */
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#define CLOCK_IDLE_CONTROL (1 << 1)
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#define CLOCK_NO_IDLE_PARENT (1 << 2)
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#define ENABLE_ON_INIT (1 << 3) /* Enable upon framework init */
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#define INVERT_ENABLE (1 << 4) /* 0 enables, 1 disables */
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#define CLOCK_CLKOUTX2 (1 << 5)
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/* CM_CLKEN_PLL*.EN* bit values - not all are available for every DPLL */
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#define DPLL_LOW_POWER_STOP 0x1
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#define DPLL_LOW_POWER_BYPASS 0x5
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#define DPLL_LOCKED 0x7
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/* DPLL Type and DCO Selection Flags */
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#define DPLL_J_TYPE 0x1
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/* Static memmap indices */
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enum {
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TI_CLKM_CM = 0,
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TI_CLKM_CM2,
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TI_CLKM_PRM,
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TI_CLKM_SCRM,
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TI_CLKM_CTRL,
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TI_CLKM_PLLSS,
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CLK_MAX_MEMMAPS
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};
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/**
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* struct ti_clk_ll_ops - low-level ops for clocks
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* @clk_readl: pointer to register read function
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* @clk_writel: pointer to register write function
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* @clkdm_clk_enable: pointer to clockdomain enable function
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* @clkdm_clk_disable: pointer to clockdomain disable function
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* @clkdm_lookup: pointer to clockdomain lookup function
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* @cm_wait_module_ready: pointer to CM module wait ready function
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* @cm_split_idlest_reg: pointer to CM module function to split idlest reg
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*
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* Low-level ops are generally used by the basic clock types (clk-gate,
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* clk-mux, clk-divider etc.) to provide support for various low-level
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* hadrware interfaces (direct MMIO, regmap etc.), and is initialized
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* by board code. Low-level ops also contain some other platform specific
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* operations not provided directly by clock drivers.
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*/
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struct ti_clk_ll_ops {
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u32 (*clk_readl)(const struct clk_omap_reg *reg);
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void (*clk_writel)(u32 val, const struct clk_omap_reg *reg);
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int (*clkdm_clk_enable)(struct clockdomain *clkdm, struct clk *clk);
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int (*clkdm_clk_disable)(struct clockdomain *clkdm,
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struct clk *clk);
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struct clockdomain * (*clkdm_lookup)(const char *name);
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int (*cm_wait_module_ready)(u8 part, s16 prcm_mod, u16 idlest_reg,
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u8 idlest_shift);
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int (*cm_split_idlest_reg)(struct clk_omap_reg *idlest_reg,
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s16 *prcm_inst, u8 *idlest_reg_id);
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};
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#define to_clk_hw_omap(_hw) container_of(_hw, struct clk_hw_omap, hw)
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int omap2_clk_disable_autoidle_all(void);
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int omap2_clk_enable_autoidle_all(void);
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int omap2_clk_allow_idle(struct clk *clk);
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int omap2_clk_deny_idle(struct clk *clk);
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unsigned long omap2_dpllcore_recalc(struct clk_hw *hw,
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unsigned long parent_rate);
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int omap2_reprogram_dpllcore(struct clk_hw *clk, unsigned long rate,
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unsigned long parent_rate);
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void omap2xxx_clkt_dpllcore_init(struct clk_hw *hw);
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void omap2xxx_clkt_vps_init(void);
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unsigned long omap2_get_dpll_rate(struct clk_hw_omap *clk);
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void ti_dt_clk_init_retry_clks(void);
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void ti_dt_clockdomains_setup(void);
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int ti_clk_setup_ll_ops(struct ti_clk_ll_ops *ops);
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struct regmap;
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int omap2_clk_provider_init(struct device_node *parent, int index,
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struct regmap *syscon, void __iomem *mem);
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void omap2_clk_legacy_provider_init(int index, void __iomem *mem);
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int omap3430_dt_clk_init(void);
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int omap3630_dt_clk_init(void);
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int am35xx_dt_clk_init(void);
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int dm814x_dt_clk_init(void);
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int dm816x_dt_clk_init(void);
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int omap4xxx_dt_clk_init(void);
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int omap5xxx_dt_clk_init(void);
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int dra7xx_dt_clk_init(void);
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int am33xx_dt_clk_init(void);
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int am43xx_dt_clk_init(void);
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int omap2420_dt_clk_init(void);
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int omap2430_dt_clk_init(void);
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struct ti_clk_features {
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u32 flags;
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long fint_min;
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long fint_max;
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long fint_band1_max;
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long fint_band2_min;
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u8 dpll_bypass_vals;
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u8 cm_idlest_val;
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};
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#define TI_CLK_DPLL_HAS_FREQSEL BIT(0)
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#define TI_CLK_DPLL4_DENY_REPROGRAM BIT(1)
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#define TI_CLK_DISABLE_CLKDM_CONTROL BIT(2)
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#define TI_CLK_ERRATA_I810 BIT(3)
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void ti_clk_setup_features(struct ti_clk_features *features);
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const struct ti_clk_features *ti_clk_get_features(void);
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extern const struct clk_hw_omap_ops clkhwops_omap2xxx_dpll;
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#ifdef CONFIG_ATAGS
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int omap3430_clk_legacy_init(void);
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int omap3430es1_clk_legacy_init(void);
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int omap36xx_clk_legacy_init(void);
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int am35xx_clk_legacy_init(void);
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#else
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static inline int omap3430_clk_legacy_init(void) { return -ENXIO; }
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static inline int omap3430es1_clk_legacy_init(void) { return -ENXIO; }
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static inline int omap36xx_clk_legacy_init(void) { return -ENXIO; }
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static inline int am35xx_clk_legacy_init(void) { return -ENXIO; }
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#endif
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#endif
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