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clk: st: Support for PLLs inside ClockGenA(s)
The patch supports the c65/c32 type PLLs used by ClockGenA(s) PLL clock : It includes support for all c65/c32 type PLLs inside ClockGenA(s) : implemented as Fixed Parent / Fixed Rate clock, with clock rate calculated reading H/w settings done at BOOT. c65 PLLs have 2 outputs : HS and LS c32 PLLs have 1-4 outputs : ODFx Signed-off-by: Pankaj Dev <pankaj.dev@st.com> Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Gabriel FERNANDEZ
Mike Turquette
parent
94885faf9d
commit
b9b8e614b5
@ -1 +1 @@
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obj-y += clkgen-mux.o
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obj-y += clkgen-mux.o clkgen-pll.o
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559
drivers/clk/st/clkgen-pll.c
Normal file
559
drivers/clk/st/clkgen-pll.c
Normal file
@ -0,0 +1,559 @@
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/*
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* Copyright (C) 2014 STMicroelectronics (R&D) Limited
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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/*
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* Authors:
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* Stephen Gallimore <stephen.gallimore@st.com>,
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* Pankaj Dev <pankaj.dev@st.com>.
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*/
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#include <linux/slab.h>
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#include <linux/of_address.h>
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#include <linux/clk-provider.h>
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#include "clkgen.h"
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static DEFINE_SPINLOCK(clkgena_c32_odf_lock);
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/*
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* Common PLL configuration register bits for PLL800 and PLL1600 C65
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*/
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#define C65_MDIV_PLL800_MASK (0xff)
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#define C65_MDIV_PLL1600_MASK (0x7)
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#define C65_NDIV_MASK (0xff)
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#define C65_PDIV_MASK (0x7)
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/*
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* PLL configuration register bits for PLL3200 C32
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*/
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#define C32_NDIV_MASK (0xff)
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#define C32_IDF_MASK (0x7)
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#define C32_ODF_MASK (0x3f)
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#define C32_LDF_MASK (0x7f)
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#define C32_MAX_ODFS (4)
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struct clkgen_pll_data {
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struct clkgen_field pdn_status;
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struct clkgen_field locked_status;
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struct clkgen_field mdiv;
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struct clkgen_field ndiv;
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struct clkgen_field pdiv;
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struct clkgen_field idf;
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struct clkgen_field ldf;
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unsigned int num_odfs;
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struct clkgen_field odf[C32_MAX_ODFS];
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struct clkgen_field odf_gate[C32_MAX_ODFS];
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const struct clk_ops *ops;
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};
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static const struct clk_ops st_pll1600c65_ops;
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static const struct clk_ops st_pll800c65_ops;
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static const struct clk_ops stm_pll3200c32_ops;
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static const struct clk_ops st_pll1200c32_ops;
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static struct clkgen_pll_data st_pll1600c65_ax = {
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.pdn_status = CLKGEN_FIELD(0x0, 0x1, 19),
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.locked_status = CLKGEN_FIELD(0x0, 0x1, 31),
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.mdiv = CLKGEN_FIELD(0x0, C65_MDIV_PLL1600_MASK, 0),
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.ndiv = CLKGEN_FIELD(0x0, C65_NDIV_MASK, 8),
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.ops = &st_pll1600c65_ops
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};
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static struct clkgen_pll_data st_pll800c65_ax = {
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.pdn_status = CLKGEN_FIELD(0x0, 0x1, 19),
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.locked_status = CLKGEN_FIELD(0x0, 0x1, 31),
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.mdiv = CLKGEN_FIELD(0x0, C65_MDIV_PLL800_MASK, 0),
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.ndiv = CLKGEN_FIELD(0x0, C65_NDIV_MASK, 8),
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.pdiv = CLKGEN_FIELD(0x0, C65_PDIV_MASK, 16),
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.ops = &st_pll800c65_ops
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};
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static struct clkgen_pll_data st_pll3200c32_a1x_0 = {
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.pdn_status = CLKGEN_FIELD(0x0, 0x1, 31),
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.locked_status = CLKGEN_FIELD(0x4, 0x1, 31),
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.ndiv = CLKGEN_FIELD(0x0, C32_NDIV_MASK, 0x0),
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.idf = CLKGEN_FIELD(0x4, C32_IDF_MASK, 0x0),
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.num_odfs = 4,
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.odf = { CLKGEN_FIELD(0x54, C32_ODF_MASK, 4),
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CLKGEN_FIELD(0x54, C32_ODF_MASK, 10),
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CLKGEN_FIELD(0x54, C32_ODF_MASK, 16),
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CLKGEN_FIELD(0x54, C32_ODF_MASK, 22) },
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.odf_gate = { CLKGEN_FIELD(0x54, 0x1, 0),
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CLKGEN_FIELD(0x54, 0x1, 1),
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CLKGEN_FIELD(0x54, 0x1, 2),
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CLKGEN_FIELD(0x54, 0x1, 3) },
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.ops = &stm_pll3200c32_ops,
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};
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static struct clkgen_pll_data st_pll3200c32_a1x_1 = {
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.pdn_status = CLKGEN_FIELD(0xC, 0x1, 31),
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.locked_status = CLKGEN_FIELD(0x10, 0x1, 31),
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.ndiv = CLKGEN_FIELD(0xC, C32_NDIV_MASK, 0x0),
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.idf = CLKGEN_FIELD(0x10, C32_IDF_MASK, 0x0),
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.num_odfs = 4,
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.odf = { CLKGEN_FIELD(0x58, C32_ODF_MASK, 4),
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CLKGEN_FIELD(0x58, C32_ODF_MASK, 10),
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CLKGEN_FIELD(0x58, C32_ODF_MASK, 16),
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CLKGEN_FIELD(0x58, C32_ODF_MASK, 22) },
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.odf_gate = { CLKGEN_FIELD(0x58, 0x1, 0),
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CLKGEN_FIELD(0x58, 0x1, 1),
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CLKGEN_FIELD(0x58, 0x1, 2),
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CLKGEN_FIELD(0x58, 0x1, 3) },
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.ops = &stm_pll3200c32_ops,
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};
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/**
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* DOC: Clock Generated by PLL, rate set and enabled by bootloader
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*
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* Traits of this clock:
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* prepare - clk_(un)prepare only ensures parent is (un)prepared
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* enable - clk_enable/disable only ensures parent is enabled
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* rate - rate is fixed. No clk_set_rate support
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* parent - fixed parent. No clk_set_parent support
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*/
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/**
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* PLL clock that is integrated in the ClockGenA instances on the STiH415
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* and STiH416.
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*
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* @hw: handle between common and hardware-specific interfaces.
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* @type: PLL instance type.
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* @regs_base: base of the PLL configuration register(s).
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*
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*/
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struct clkgen_pll {
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struct clk_hw hw;
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struct clkgen_pll_data *data;
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void __iomem *regs_base;
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};
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#define to_clkgen_pll(_hw) container_of(_hw, struct clkgen_pll, hw)
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static int clkgen_pll_is_locked(struct clk_hw *hw)
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{
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struct clkgen_pll *pll = to_clkgen_pll(hw);
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u32 locked = CLKGEN_READ(pll, locked_status);
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return !!locked;
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}
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static int clkgen_pll_is_enabled(struct clk_hw *hw)
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{
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struct clkgen_pll *pll = to_clkgen_pll(hw);
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u32 poweroff = CLKGEN_READ(pll, pdn_status);
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return !poweroff;
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}
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unsigned long recalc_stm_pll800c65(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct clkgen_pll *pll = to_clkgen_pll(hw);
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unsigned long mdiv, ndiv, pdiv;
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unsigned long rate;
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uint64_t res;
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if (!clkgen_pll_is_enabled(hw) || !clkgen_pll_is_locked(hw))
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return 0;
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pdiv = CLKGEN_READ(pll, pdiv);
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mdiv = CLKGEN_READ(pll, mdiv);
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ndiv = CLKGEN_READ(pll, ndiv);
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if (!mdiv)
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mdiv++; /* mdiv=0 or 1 => MDIV=1 */
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res = (uint64_t)2 * (uint64_t)parent_rate * (uint64_t)ndiv;
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rate = (unsigned long)div64_u64(res, mdiv * (1 << pdiv));
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pr_debug("%s:%s rate %lu\n", __clk_get_name(hw->clk), __func__, rate);
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return rate;
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}
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unsigned long recalc_stm_pll1600c65(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct clkgen_pll *pll = to_clkgen_pll(hw);
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unsigned long mdiv, ndiv;
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unsigned long rate;
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if (!clkgen_pll_is_enabled(hw) || !clkgen_pll_is_locked(hw))
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return 0;
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mdiv = CLKGEN_READ(pll, mdiv);
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ndiv = CLKGEN_READ(pll, ndiv);
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if (!mdiv)
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mdiv = 1;
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/* Note: input is divided by 1000 to avoid overflow */
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rate = ((2 * (parent_rate / 1000) * ndiv) / mdiv) * 1000;
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pr_debug("%s:%s rate %lu\n", __clk_get_name(hw->clk), __func__, rate);
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return rate;
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}
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unsigned long recalc_stm_pll3200c32(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct clkgen_pll *pll = to_clkgen_pll(hw);
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unsigned long ndiv, idf;
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unsigned long rate = 0;
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if (!clkgen_pll_is_enabled(hw) || !clkgen_pll_is_locked(hw))
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return 0;
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ndiv = CLKGEN_READ(pll, ndiv);
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idf = CLKGEN_READ(pll, idf);
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if (idf)
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/* Note: input is divided to avoid overflow */
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rate = ((2 * (parent_rate/1000) * ndiv) / idf) * 1000;
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pr_debug("%s:%s rate %lu\n", __clk_get_name(hw->clk), __func__, rate);
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return rate;
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}
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unsigned long recalc_stm_pll1200c32(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct clkgen_pll *pll = to_clkgen_pll(hw);
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unsigned long odf, ldf, idf;
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unsigned long rate;
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if (!clkgen_pll_is_enabled(hw) || !clkgen_pll_is_locked(hw))
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return 0;
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odf = CLKGEN_READ(pll, odf[0]);
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ldf = CLKGEN_READ(pll, ldf);
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idf = CLKGEN_READ(pll, idf);
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if (!idf) /* idf==0 means 1 */
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idf = 1;
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if (!odf) /* odf==0 means 1 */
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odf = 1;
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/* Note: input is divided by 1000 to avoid overflow */
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rate = (((parent_rate / 1000) * ldf) / (odf * idf)) * 1000;
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pr_debug("%s:%s rate %lu\n", __clk_get_name(hw->clk), __func__, rate);
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return rate;
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}
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static const struct clk_ops st_pll1600c65_ops = {
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.is_enabled = clkgen_pll_is_enabled,
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.recalc_rate = recalc_stm_pll1600c65,
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};
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static const struct clk_ops st_pll800c65_ops = {
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.is_enabled = clkgen_pll_is_enabled,
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.recalc_rate = recalc_stm_pll800c65,
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};
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static const struct clk_ops stm_pll3200c32_ops = {
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.is_enabled = clkgen_pll_is_enabled,
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.recalc_rate = recalc_stm_pll3200c32,
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};
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static const struct clk_ops st_pll1200c32_ops = {
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.is_enabled = clkgen_pll_is_enabled,
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.recalc_rate = recalc_stm_pll1200c32,
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};
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static struct clk * __init clkgen_pll_register(const char *parent_name,
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struct clkgen_pll_data *pll_data,
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void __iomem *reg,
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const char *clk_name)
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{
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struct clkgen_pll *pll;
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struct clk *clk;
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struct clk_init_data init;
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pll = kzalloc(sizeof(*pll), GFP_KERNEL);
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if (!pll)
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return ERR_PTR(-ENOMEM);
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init.name = clk_name;
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init.ops = pll_data->ops;
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init.flags = CLK_IS_BASIC;
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init.parent_names = &parent_name;
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init.num_parents = 1;
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pll->data = pll_data;
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pll->regs_base = reg;
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pll->hw.init = &init;
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clk = clk_register(NULL, &pll->hw);
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if (IS_ERR(clk)) {
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kfree(pll);
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return clk;
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}
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pr_debug("%s: parent %s rate %lu\n",
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__clk_get_name(clk),
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__clk_get_name(clk_get_parent(clk)),
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clk_get_rate(clk));
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return clk;
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}
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static struct clk * __init clkgen_c65_lsdiv_register(const char *parent_name,
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const char *clk_name)
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{
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struct clk *clk;
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clk = clk_register_fixed_factor(NULL, clk_name, parent_name, 0, 1, 2);
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if (IS_ERR(clk))
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return clk;
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pr_debug("%s: parent %s rate %lu\n",
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__clk_get_name(clk),
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__clk_get_name(clk_get_parent(clk)),
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clk_get_rate(clk));
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return clk;
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}
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static void __iomem * __init clkgen_get_register_base(
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struct device_node *np)
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{
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struct device_node *pnode;
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void __iomem *reg = NULL;
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pnode = of_get_parent(np);
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if (!pnode)
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return NULL;
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reg = of_iomap(pnode, 0);
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of_node_put(pnode);
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return reg;
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}
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#define CLKGENAx_PLL0_OFFSET 0x0
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#define CLKGENAx_PLL1_OFFSET 0x4
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static void __init clkgena_c65_pll_setup(struct device_node *np)
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{
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const int num_pll_outputs = 3;
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struct clk_onecell_data *clk_data;
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const char *parent_name;
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void __iomem *reg;
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const char *clk_name;
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parent_name = of_clk_get_parent_name(np, 0);
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if (!parent_name)
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return;
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reg = clkgen_get_register_base(np);
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if (!reg)
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return;
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clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
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if (!clk_data)
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return;
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clk_data->clk_num = num_pll_outputs;
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clk_data->clks = kzalloc(clk_data->clk_num * sizeof(struct clk *),
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GFP_KERNEL);
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if (!clk_data->clks)
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goto err;
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if (of_property_read_string_index(np, "clock-output-names",
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0, &clk_name))
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goto err;
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/*
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* PLL0 HS (high speed) output
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*/
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clk_data->clks[0] = clkgen_pll_register(parent_name,
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&st_pll1600c65_ax,
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reg + CLKGENAx_PLL0_OFFSET,
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clk_name);
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if (IS_ERR(clk_data->clks[0]))
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goto err;
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if (of_property_read_string_index(np, "clock-output-names",
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1, &clk_name))
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goto err;
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/*
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* PLL0 LS (low speed) output, which is a fixed divide by 2 of the
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* high speed output.
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*/
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clk_data->clks[1] = clkgen_c65_lsdiv_register(__clk_get_name
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(clk_data->clks[0]),
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clk_name);
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if (IS_ERR(clk_data->clks[1]))
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goto err;
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if (of_property_read_string_index(np, "clock-output-names",
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2, &clk_name))
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goto err;
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/*
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* PLL1 output
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*/
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clk_data->clks[2] = clkgen_pll_register(parent_name,
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&st_pll800c65_ax,
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reg + CLKGENAx_PLL1_OFFSET,
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clk_name);
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if (IS_ERR(clk_data->clks[2]))
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goto err;
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of_clk_add_provider(np, of_clk_src_onecell_get, clk_data);
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return;
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err:
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kfree(clk_data->clks);
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kfree(clk_data);
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}
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CLK_OF_DECLARE(clkgena_c65_plls,
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"st,clkgena-plls-c65", clkgena_c65_pll_setup);
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static struct clk * __init clkgen_odf_register(const char *parent_name,
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void * __iomem reg,
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struct clkgen_pll_data *pll_data,
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int odf,
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spinlock_t *odf_lock,
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const char *odf_name)
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{
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struct clk *clk;
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unsigned long flags;
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struct clk_gate *gate;
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struct clk_divider *div;
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flags = CLK_GET_RATE_NOCACHE | CLK_SET_RATE_GATE;
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gate = kzalloc(sizeof(*gate), GFP_KERNEL);
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if (!gate)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
gate->flags = CLK_GATE_SET_TO_DISABLE;
|
||||
gate->reg = reg + pll_data->odf_gate[odf].offset;
|
||||
gate->bit_idx = pll_data->odf_gate[odf].shift;
|
||||
gate->lock = odf_lock;
|
||||
|
||||
div = kzalloc(sizeof(*div), GFP_KERNEL);
|
||||
if (!div)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
div->flags = CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO;
|
||||
div->reg = reg + pll_data->odf[odf].offset;
|
||||
div->shift = pll_data->odf[odf].shift;
|
||||
div->width = fls(pll_data->odf[odf].mask);
|
||||
div->lock = odf_lock;
|
||||
|
||||
clk = clk_register_composite(NULL, odf_name, &parent_name, 1,
|
||||
NULL, NULL,
|
||||
&div->hw, &clk_divider_ops,
|
||||
&gate->hw, &clk_gate_ops,
|
||||
flags);
|
||||
if (IS_ERR(clk))
|
||||
return clk;
|
||||
|
||||
pr_debug("%s: parent %s rate %lu\n",
|
||||
__clk_get_name(clk),
|
||||
__clk_get_name(clk_get_parent(clk)),
|
||||
clk_get_rate(clk));
|
||||
return clk;
|
||||
}
|
||||
|
||||
static struct of_device_id c32_pll_of_match[] = {
|
||||
{
|
||||
.compatible = "st,plls-c32-a1x-0",
|
||||
.data = &st_pll3200c32_a1x_0,
|
||||
},
|
||||
{
|
||||
.compatible = "st,plls-c32-a1x-1",
|
||||
.data = &st_pll3200c32_a1x_1,
|
||||
},
|
||||
{}
|
||||
};
|
||||
|
||||
static void __init clkgen_c32_pll_setup(struct device_node *np)
|
||||
{
|
||||
const struct of_device_id *match;
|
||||
struct clk *clk;
|
||||
const char *parent_name, *pll_name;
|
||||
void __iomem *pll_base;
|
||||
int num_odfs, odf;
|
||||
struct clk_onecell_data *clk_data;
|
||||
struct clkgen_pll_data *data;
|
||||
|
||||
match = of_match_node(c32_pll_of_match, np);
|
||||
if (!match) {
|
||||
pr_err("%s: No matching data\n", __func__);
|
||||
return;
|
||||
}
|
||||
|
||||
data = (struct clkgen_pll_data *) match->data;
|
||||
|
||||
parent_name = of_clk_get_parent_name(np, 0);
|
||||
if (!parent_name)
|
||||
return;
|
||||
|
||||
pll_base = clkgen_get_register_base(np);
|
||||
if (!pll_base)
|
||||
return;
|
||||
|
||||
clk = clkgen_pll_register(parent_name, data, pll_base, np->name);
|
||||
if (IS_ERR(clk))
|
||||
return;
|
||||
|
||||
pll_name = __clk_get_name(clk);
|
||||
|
||||
num_odfs = data->num_odfs;
|
||||
|
||||
clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
|
||||
if (!clk_data)
|
||||
return;
|
||||
|
||||
clk_data->clk_num = num_odfs;
|
||||
clk_data->clks = kzalloc(clk_data->clk_num * sizeof(struct clk *),
|
||||
GFP_KERNEL);
|
||||
|
||||
if (!clk_data->clks)
|
||||
goto err;
|
||||
|
||||
for (odf = 0; odf < num_odfs; odf++) {
|
||||
struct clk *clk;
|
||||
const char *clk_name;
|
||||
|
||||
if (of_property_read_string_index(np, "clock-output-names",
|
||||
odf, &clk_name))
|
||||
return;
|
||||
|
||||
clk = clkgen_odf_register(pll_name, pll_base, data,
|
||||
odf, &clkgena_c32_odf_lock, clk_name);
|
||||
if (IS_ERR(clk))
|
||||
goto err;
|
||||
|
||||
clk_data->clks[odf] = clk;
|
||||
}
|
||||
|
||||
of_clk_add_provider(np, of_clk_src_onecell_get, clk_data);
|
||||
return;
|
||||
|
||||
err:
|
||||
kfree(pll_name);
|
||||
kfree(clk_data->clks);
|
||||
kfree(clk_data);
|
||||
}
|
||||
CLK_OF_DECLARE(clkgen_c32_pll, "st,clkgen-plls-c32", clkgen_c32_pll_setup);
|
||||
48
drivers/clk/st/clkgen.h
Normal file
48
drivers/clk/st/clkgen.h
Normal file
@ -0,0 +1,48 @@
|
||||
/************************************************************************
|
||||
File : Clock H/w specific Information
|
||||
|
||||
Author: Pankaj Dev <pankaj.dev@st.com>
|
||||
|
||||
Copyright (C) 2014 STMicroelectronics
|
||||
************************************************************************/
|
||||
|
||||
#ifndef __CLKGEN_INFO_H
|
||||
#define __CLKGEN_INFO_H
|
||||
|
||||
struct clkgen_field {
|
||||
unsigned int offset;
|
||||
unsigned int mask;
|
||||
unsigned int shift;
|
||||
};
|
||||
|
||||
static inline unsigned long clkgen_read(void __iomem *base,
|
||||
struct clkgen_field *field)
|
||||
{
|
||||
return (readl(base + field->offset) >> field->shift) & field->mask;
|
||||
}
|
||||
|
||||
|
||||
static inline void clkgen_write(void __iomem *base, struct clkgen_field *field,
|
||||
unsigned long val)
|
||||
{
|
||||
writel((readl(base + field->offset) &
|
||||
~(field->mask << field->shift)) | (val << field->shift),
|
||||
base + field->offset);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
#define CLKGEN_FIELD(_offset, _mask, _shift) { \
|
||||
.offset = _offset, \
|
||||
.mask = _mask, \
|
||||
.shift = _shift, \
|
||||
}
|
||||
|
||||
#define CLKGEN_READ(pll, field) clkgen_read(pll->regs_base, \
|
||||
&pll->data->field)
|
||||
|
||||
#define CLKGEN_WRITE(pll, field, val) clkgen_write(pll->regs_base, \
|
||||
&pll->data->field, val)
|
||||
|
||||
#endif /*__CLKGEN_INFO_H*/
|
||||
|
||||
Loading…
Reference in New Issue
Block a user