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/*
* Ingenic SoC CGU driver
*
* Copyright (c) 2013-2015 Imagination Technologies
* Author: Paul Burton <paul.burton@imgtec.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* 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.
*/
#ifndef __DRIVERS_CLK_INGENIC_CGU_H__
#define __DRIVERS_CLK_INGENIC_CGU_H__
#include <linux/bitops.h>
#include <linux/of.h>
#include <linux/spinlock.h>
/**
* struct ingenic_cgu_pll_info - information about a PLL
* @reg: the offset of the PLL's control register within the CGU
* @m_shift: the number of bits to shift the multiplier value by (ie. the
* index of the lowest bit of the multiplier value in the PLL's
* control register)
* @m_bits: the size of the multiplier field in bits
* @m_offset: the multiplier value which encodes to 0 in the PLL's control
* register
* @n_shift: the number of bits to shift the divider value by (ie. the
* index of the lowest bit of the divider value in the PLL's
* control register)
* @n_bits: the size of the divider field in bits
* @n_offset: the divider value which encodes to 0 in the PLL's control
* register
* @od_shift: the number of bits to shift the post-VCO divider value by (ie.
* the index of the lowest bit of the post-VCO divider value in
* the PLL's control register)
* @od_bits: the size of the post-VCO divider field in bits
* @od_max: the maximum post-VCO divider value
* @od_encoding: a pointer to an array mapping post-VCO divider values to
* their encoded values in the PLL control register, or -1 for
* unsupported values
* @bypass_bit: the index of the bypass bit in the PLL control register
* @enable_bit: the index of the enable bit in the PLL control register
* @stable_bit: the index of the stable bit in the PLL control register
*/
struct ingenic_cgu_pll_info {
unsigned reg;
const s8 *od_encoding;
u8 m_shift, m_bits, m_offset;
u8 n_shift, n_bits, n_offset;
u8 od_shift, od_bits, od_max;
u8 bypass_bit;
u8 enable_bit;
u8 stable_bit;
};
/**
* struct ingenic_cgu_mux_info - information about a clock mux
* @reg: offset of the mux control register within the CGU
* @shift: number of bits to shift the mux value by (ie. the index of
* the lowest bit of the mux value within its control register)
* @bits: the size of the mux value in bits
*/
struct ingenic_cgu_mux_info {
unsigned reg;
u8 shift;
u8 bits;
};
/**
* struct ingenic_cgu_div_info - information about a divider
* @reg: offset of the divider control register within the CGU
* @shift: number of bits to shift the divide value by (ie. the index of
* the lowest bit of the divide value within its control register)
* @bits: the size of the divide value in bits
* @ce_bit: the index of the change enable bit within reg, or -1 if there
* isn't one
* @busy_bit: the index of the busy bit within reg, or -1 if there isn't one
* @stop_bit: the index of the stop bit within reg, or -1 if there isn't one
*/
struct ingenic_cgu_div_info {
unsigned reg;
u8 shift;
u8 bits;
s8 ce_bit;
s8 busy_bit;
s8 stop_bit;
};
/**
* struct ingenic_cgu_fixdiv_info - information about a fixed divider
* @div: the divider applied to the parent clock
*/
struct ingenic_cgu_fixdiv_info {
unsigned div;
};
/**
* struct ingenic_cgu_gate_info - information about a clock gate
* @reg: offset of the gate control register within the CGU
* @bit: offset of the bit in the register that controls the gate
*/
struct ingenic_cgu_gate_info {
unsigned reg;
u8 bit;
};
/**
* struct ingenic_cgu_custom_info - information about a custom (SoC) clock
* @clk_ops: custom clock operation callbacks
*/
struct ingenic_cgu_custom_info {
struct clk_ops *clk_ops;
};
/**
* struct ingenic_cgu_clk_info - information about a clock
* @name: name of the clock
* @type: a bitmask formed from CGU_CLK_* values
* @parents: an array of the indices of potential parents of this clock
* within the clock_info array of the CGU, or -1 in entries
* which correspond to no valid parent
* @pll: information valid if type includes CGU_CLK_PLL
* @gate: information valid if type includes CGU_CLK_GATE
* @mux: information valid if type includes CGU_CLK_MUX
* @div: information valid if type includes CGU_CLK_DIV
* @fixdiv: information valid if type includes CGU_CLK_FIXDIV
* @custom: information valid if type includes CGU_CLK_CUSTOM
*/
struct ingenic_cgu_clk_info {
const char *name;
enum {
CGU_CLK_NONE = 0,
CGU_CLK_EXT = BIT(0),
CGU_CLK_PLL = BIT(1),
CGU_CLK_GATE = BIT(2),
CGU_CLK_MUX = BIT(3),
CGU_CLK_MUX_GLITCHFREE = BIT(4),
CGU_CLK_DIV = BIT(5),
CGU_CLK_FIXDIV = BIT(6),
CGU_CLK_CUSTOM = BIT(7),
} type;
int parents[4];
union {
struct ingenic_cgu_pll_info pll;
struct {
struct ingenic_cgu_gate_info gate;
struct ingenic_cgu_mux_info mux;
struct ingenic_cgu_div_info div;
struct ingenic_cgu_fixdiv_info fixdiv;
};
struct ingenic_cgu_custom_info custom;
};
};
/**
* struct ingenic_cgu - data about the CGU
* @np: the device tree node that caused the CGU to be probed
* @base: the ioremap'ed base address of the CGU registers
* @clock_info: an array containing information about implemented clocks
* @clocks: used to provide clocks to DT, allows lookup of struct clk*
* @lock: lock to be held whilst manipulating CGU registers
*/
struct ingenic_cgu {
struct device_node *np;
void __iomem *base;
const struct ingenic_cgu_clk_info *clock_info;
struct clk_onecell_data clocks;
spinlock_t lock;
};
/**
* struct ingenic_clk - private data for a clock
* @hw: see Documentation/clk.txt
* @cgu: a pointer to the CGU data
* @idx: the index of this clock in cgu->clock_info
*/
struct ingenic_clk {
struct clk_hw hw;
struct ingenic_cgu *cgu;
unsigned idx;
};
#define to_ingenic_clk(_hw) container_of(_hw, struct ingenic_clk, hw)
/**
* ingenic_cgu_new() - create a new CGU instance
* @clock_info: an array of clock information structures describing the clocks
* which are implemented by the CGU
* @num_clocks: the number of entries in clock_info
* @np: the device tree node which causes this CGU to be probed
*
* Return: a pointer to the CGU instance if initialisation is successful,
* otherwise NULL.
*/
struct ingenic_cgu *
ingenic_cgu_new(const struct ingenic_cgu_clk_info *clock_info,
unsigned num_clocks, struct device_node *np);
/**
* ingenic_cgu_register_clocks() - Registers the clocks
* @cgu: pointer to cgu data
*
* Register the clocks described by the CGU with the common clock framework.
*
* Return: 0 on success or -errno if unsuccesful.
*/
int ingenic_cgu_register_clocks(struct ingenic_cgu *cgu);
#endif /* __DRIVERS_CLK_INGENIC_CGU_H__ */
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