clk-iproc.h
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/*
* Copyright (C) 2014 Broadcom Corporation
*
* 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 version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _CLK_IPROC_H
#define _CLK_IPROC_H
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/of.h>
#include <linux/clk-provider.h>
#define IPROC_CLK_NAME_LEN 25
#define IPROC_CLK_INVALID_OFFSET 0xffffffff
#define bit_mask(width) ((1 << (width)) - 1)
/* clocks that should not be disabled at runtime */
#define IPROC_CLK_AON BIT(0)
/* PLL that requires gating through ASIU */
#define IPROC_CLK_PLL_ASIU BIT(1)
/* PLL that has fractional part of the NDIV */
#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
/*
* Some of the iProc PLL/clocks may have an ASIC bug that requires read back
* of the same register following the write to flush the write transaction into
* the intended register
*/
#define IPROC_CLK_NEEDS_READ_BACK BIT(3)
/*
* Some PLLs require the PLL SW override bit to be set before changes can be
* applied to the PLL
*/
#define IPROC_CLK_PLL_NEEDS_SW_CFG BIT(4)
/*
* Some PLLs use a different way to control clock power, via the PWRDWN bit in
* the PLL control register
*/
#define IPROC_CLK_EMBED_PWRCTRL BIT(5)
/*
* Some PLLs have separate registers for Status and Control. Identify this to
* let the driver know if additional registers need to be used
*/
#define IPROC_CLK_PLL_SPLIT_STAT_CTRL BIT(6)
/*
* Parameters for VCO frequency configuration
*
* VCO frequency =
* ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy / pdiv)
*/
struct iproc_pll_vco_param {
unsigned long rate;
unsigned int ndiv_int;
unsigned int ndiv_frac;
unsigned int pdiv;
};
struct iproc_clk_reg_op {
unsigned int offset;
unsigned int shift;
unsigned int width;
};
/*
* Clock gating control at the top ASIU level
*/
struct iproc_asiu_gate {
unsigned int offset;
unsigned int en_shift;
};
/*
* Control of powering on/off of a PLL
*
* Before powering off a PLL, input isolation (ISO) needs to be enabled
*/
struct iproc_pll_aon_pwr_ctrl {
unsigned int offset;
unsigned int pwr_width;
unsigned int pwr_shift;
unsigned int iso_shift;
};
/*
* Control of the PLL reset
*/
struct iproc_pll_reset_ctrl {
unsigned int offset;
unsigned int reset_shift;
unsigned int p_reset_shift;
};
/*
* Control of the Ki, Kp, and Ka parameters
*/
struct iproc_pll_dig_filter_ctrl {
unsigned int offset;
unsigned int ki_shift;
unsigned int ki_width;
unsigned int kp_shift;
unsigned int kp_width;
unsigned int ka_shift;
unsigned int ka_width;
};
/*
* To enable SW control of the PLL
*/
struct iproc_pll_sw_ctrl {
unsigned int offset;
unsigned int shift;
};
struct iproc_pll_vco_ctrl {
unsigned int u_offset;
unsigned int l_offset;
};
/*
* Main PLL control parameters
*/
struct iproc_pll_ctrl {
unsigned long flags;
struct iproc_pll_aon_pwr_ctrl aon;
struct iproc_asiu_gate asiu;
struct iproc_pll_reset_ctrl reset;
struct iproc_pll_dig_filter_ctrl dig_filter;
struct iproc_pll_sw_ctrl sw_ctrl;
struct iproc_clk_reg_op ndiv_int;
struct iproc_clk_reg_op ndiv_frac;
struct iproc_clk_reg_op pdiv;
struct iproc_pll_vco_ctrl vco_ctrl;
struct iproc_clk_reg_op status;
};
/*
* Controls enabling/disabling a PLL derived clock
*/
struct iproc_clk_enable_ctrl {
unsigned int offset;
unsigned int enable_shift;
unsigned int hold_shift;
unsigned int bypass_shift;
};
/*
* Main clock control parameters for clocks derived from the PLLs
*/
struct iproc_clk_ctrl {
unsigned int channel;
unsigned long flags;
struct iproc_clk_enable_ctrl enable;
struct iproc_clk_reg_op mdiv;
};
/*
* Divisor of the ASIU clocks
*/
struct iproc_asiu_div {
unsigned int offset;
unsigned int en_shift;
unsigned int high_shift;
unsigned int high_width;
unsigned int low_shift;
unsigned int low_width;
};
void __init iproc_armpll_setup(struct device_node *node);
void __init iproc_pll_clk_setup(struct device_node *node,
const struct iproc_pll_ctrl *pll_ctrl,
const struct iproc_pll_vco_param *vco,
unsigned int num_vco_entries,
const struct iproc_clk_ctrl *clk_ctrl,
unsigned int num_clks);
void __init iproc_asiu_setup(struct device_node *node,
const struct iproc_asiu_div *div,
const struct iproc_asiu_gate *gate,
unsigned int num_clks);
#endif /* _CLK_IPROC_H */