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brintos / linux-shallow public Read only

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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2017, Intel Corporation4 */5#include <linux/clk-provider.h>6#include <linux/io.h>7#include <linux/slab.h>8#include "stratix10-clk.h"9#include "clk.h"10 11#define SOCFPGA_CS_PDBG_CLK	"cs_pdbg_clk"12#define to_socfpga_gate_clk(p) container_of(p, struct socfpga_gate_clk, hw.hw)13 14#define SOCFPGA_EMAC0_CLK		"emac0_clk"15#define SOCFPGA_EMAC1_CLK		"emac1_clk"16#define SOCFPGA_EMAC2_CLK		"emac2_clk"17#define AGILEX_BYPASS_OFFSET		0xC18#define STRATIX10_BYPASS_OFFSET		0x2C19#define BOOTCLK_BYPASS			220 21static unsigned long socfpga_gate_clk_recalc_rate(struct clk_hw *hwclk,22						  unsigned long parent_rate)23{24	struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk);25	u32 div = 1, val;26 27	if (socfpgaclk->fixed_div) {28		div = socfpgaclk->fixed_div;29	} else if (socfpgaclk->div_reg) {30		val = readl(socfpgaclk->div_reg) >> socfpgaclk->shift;31		val &= GENMASK(socfpgaclk->width - 1, 0);32		div = (1 << val);33	}34	return parent_rate / div;35}36 37static unsigned long socfpga_dbg_clk_recalc_rate(struct clk_hw *hwclk,38						  unsigned long parent_rate)39{40	struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk);41	u32 div, val;42 43	val = readl(socfpgaclk->div_reg) >> socfpgaclk->shift;44	val &= GENMASK(socfpgaclk->width - 1, 0);45	div = (1 << val);46	div = div ? 4 : 1;47 48	return parent_rate / div;49}50 51static u8 socfpga_gate_get_parent(struct clk_hw *hwclk)52{53	struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk);54	u32 mask, second_bypass;55	u8 parent = 0;56	const char *name = clk_hw_get_name(hwclk);57 58	if (socfpgaclk->bypass_reg) {59		mask = (0x1 << socfpgaclk->bypass_shift);60		parent = ((readl(socfpgaclk->bypass_reg) & mask) >>61			  socfpgaclk->bypass_shift);62	}63 64	if (streq(name, SOCFPGA_EMAC0_CLK) ||65	    streq(name, SOCFPGA_EMAC1_CLK) ||66	    streq(name, SOCFPGA_EMAC2_CLK)) {67		second_bypass = readl(socfpgaclk->bypass_reg -68				      STRATIX10_BYPASS_OFFSET);69		/* EMACA bypass to bootclk @0xB0 offset */70		if (second_bypass & 0x1)71			if (parent == 0) /* only applicable if parent is maca */72				parent = BOOTCLK_BYPASS;73 74		if (second_bypass & 0x2)75			if (parent == 1) /* only applicable if parent is macb */76				parent = BOOTCLK_BYPASS;77	}78	return parent;79}80 81static u8 socfpga_agilex_gate_get_parent(struct clk_hw *hwclk)82{83	struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk);84	u32 mask, second_bypass;85	u8 parent = 0;86	const char *name = clk_hw_get_name(hwclk);87 88	if (socfpgaclk->bypass_reg) {89		mask = (0x1 << socfpgaclk->bypass_shift);90		parent = ((readl(socfpgaclk->bypass_reg) & mask) >>91			  socfpgaclk->bypass_shift);92	}93 94	if (streq(name, SOCFPGA_EMAC0_CLK) ||95	    streq(name, SOCFPGA_EMAC1_CLK) ||96	    streq(name, SOCFPGA_EMAC2_CLK)) {97		second_bypass = readl(socfpgaclk->bypass_reg -98				      AGILEX_BYPASS_OFFSET);99		/* EMACA bypass to bootclk @0x88 offset */100		if (second_bypass & 0x1)101			if (parent == 0) /* only applicable if parent is maca */102				parent = BOOTCLK_BYPASS;103 104		if (second_bypass & 0x2)105			if (parent == 1) /* only applicable if parent is macb */106				parent = BOOTCLK_BYPASS;107	}108 109	return parent;110}111 112static struct clk_ops gateclk_ops = {113	.recalc_rate = socfpga_gate_clk_recalc_rate,114	.get_parent = socfpga_gate_get_parent,115};116 117static const struct clk_ops agilex_gateclk_ops = {118	.recalc_rate = socfpga_gate_clk_recalc_rate,119	.get_parent = socfpga_agilex_gate_get_parent,120};121 122static const struct clk_ops dbgclk_ops = {123	.recalc_rate = socfpga_dbg_clk_recalc_rate,124	.get_parent = socfpga_gate_get_parent,125};126 127struct clk_hw *s10_register_gate(const struct stratix10_gate_clock *clks, void __iomem *regbase)128{129	struct clk_hw *hw_clk;130	struct socfpga_gate_clk *socfpga_clk;131	struct clk_init_data init;132	const char *parent_name = clks->parent_name;133	int ret;134 135	socfpga_clk = kzalloc(sizeof(*socfpga_clk), GFP_KERNEL);136	if (!socfpga_clk)137		return NULL;138 139	socfpga_clk->hw.reg = regbase + clks->gate_reg;140	socfpga_clk->hw.bit_idx = clks->gate_idx;141 142	gateclk_ops.enable = clk_gate_ops.enable;143	gateclk_ops.disable = clk_gate_ops.disable;144 145	socfpga_clk->fixed_div = clks->fixed_div;146 147	if (clks->div_reg)148		socfpga_clk->div_reg = regbase + clks->div_reg;149	else150		socfpga_clk->div_reg = NULL;151 152	socfpga_clk->width = clks->div_width;153	socfpga_clk->shift = clks->div_offset;154 155	if (clks->bypass_reg)156		socfpga_clk->bypass_reg = regbase + clks->bypass_reg;157	else158		socfpga_clk->bypass_reg = NULL;159	socfpga_clk->bypass_shift = clks->bypass_shift;160 161	if (streq(clks->name, "cs_pdbg_clk"))162		init.ops = &dbgclk_ops;163	else164		init.ops = &gateclk_ops;165 166	init.name = clks->name;167	init.flags = clks->flags;168 169	init.num_parents = clks->num_parents;170	init.parent_names = parent_name ? &parent_name : NULL;171	if (init.parent_names == NULL)172		init.parent_data = clks->parent_data;173	socfpga_clk->hw.hw.init = &init;174 175	hw_clk = &socfpga_clk->hw.hw;176 177	ret = clk_hw_register(NULL, &socfpga_clk->hw.hw);178	if (ret) {179		kfree(socfpga_clk);180		return ERR_PTR(ret);181	}182	return hw_clk;183}184 185struct clk_hw *agilex_register_gate(const struct stratix10_gate_clock *clks, void __iomem *regbase)186{187	struct clk_hw *hw_clk;188	struct socfpga_gate_clk *socfpga_clk;189	struct clk_init_data init;190	const char *parent_name = clks->parent_name;191	int ret;192 193	socfpga_clk = kzalloc(sizeof(*socfpga_clk), GFP_KERNEL);194	if (!socfpga_clk)195		return NULL;196 197	socfpga_clk->hw.reg = regbase + clks->gate_reg;198	socfpga_clk->hw.bit_idx = clks->gate_idx;199 200	gateclk_ops.enable = clk_gate_ops.enable;201	gateclk_ops.disable = clk_gate_ops.disable;202 203	socfpga_clk->fixed_div = clks->fixed_div;204 205	if (clks->div_reg)206		socfpga_clk->div_reg = regbase + clks->div_reg;207	else208		socfpga_clk->div_reg = NULL;209 210	socfpga_clk->width = clks->div_width;211	socfpga_clk->shift = clks->div_offset;212 213	if (clks->bypass_reg)214		socfpga_clk->bypass_reg = regbase + clks->bypass_reg;215	else216		socfpga_clk->bypass_reg = NULL;217	socfpga_clk->bypass_shift = clks->bypass_shift;218 219	if (streq(clks->name, "cs_pdbg_clk"))220		init.ops = &dbgclk_ops;221	else222		init.ops = &agilex_gateclk_ops;223 224	init.name = clks->name;225	init.flags = clks->flags;226 227	init.num_parents = clks->num_parents;228	init.parent_names = parent_name ? &parent_name : NULL;229	if (init.parent_names == NULL)230		init.parent_data = clks->parent_data;231	socfpga_clk->hw.hw.init = &init;232 233	hw_clk = &socfpga_clk->hw.hw;234 235	ret = clk_hw_register(NULL, &socfpga_clk->hw.hw);236	if (ret) {237		kfree(socfpga_clk);238		return ERR_PTR(ret);239	}240	return hw_clk;241}242