drivers/clk/renesas/rcar-gen2-cpg.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  * R-Car Gen2 Clock Pulse Generator
  *
  * Copyright (C) 2016 Cogent Embedded Inc.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published
  * by the Free Software Foundation.
  */

 #include <linux/bug.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/slab.h>

 #include "renesas-cpg-mssr.h"
 #include "rcar-gen2-cpg.h"

 #define CPG_FRQCRB		0x0004
 #define CPG_FRQCRB_KICK		BIT(31)
 #define CPG_SDCKCR		0x0074
 #define CPG_PLL0CR		0x00d8
 #define CPG_PLL0CR_STC_SHIFT	24
 #define CPG_PLL0CR_STC_MASK	(0x7f << CPG_PLL0CR_STC_SHIFT)
 #define CPG_FRQCRC		0x00e0
 #define CPG_FRQCRC_ZFC_SHIFT	8
 #define CPG_FRQCRC_ZFC_MASK	(0x1f << CPG_FRQCRC_ZFC_SHIFT)
 #define CPG_ADSPCKCR		0x025c
 #define CPG_RCANCKCR		0x0270

 static spinlock_t cpg_lock;

 /*
  * Z Clock
  *
  * Traits of this clock:
  * prepare - clk_prepare only ensures that parents are prepared
  * enable - clk_enable only ensures that parents are enabled
  * rate - rate is adjustable.  clk->rate = parent->rate * mult / 32
  * parent - fixed parent.  No clk_set_parent support
  */

 struct cpg_z_clk {
 	struct clk_hw hw;
 	void __iomem *reg;
 	void __iomem *kick_reg;
 };

 #define to_z_clk(_hw)	container_of(_hw, struct cpg_z_clk, hw)

 static unsigned long cpg_z_clk_recalc_rate(struct clk_hw *hw,
 					   unsigned long parent_rate)
 {
 	struct cpg_z_clk *zclk = to_z_clk(hw);
 	unsigned int mult;
 	unsigned int val;

 	val = (readl(zclk->reg) & CPG_FRQCRC_ZFC_MASK) >> CPG_FRQCRC_ZFC_SHIFT;
 	mult = 32 - val;

 	return div_u64((u64)parent_rate * mult, 32);
 }

 static long cpg_z_clk_round_rate(struct clk_hw *hw, unsigned long rate,
 				 unsigned long *parent_rate)
 {
 	unsigned long prate  = *parent_rate;
 	unsigned int mult;

 	if (!prate)
 		prate = 1;

 	mult = div_u64((u64)rate * 32, prate);
 	mult = clamp(mult, 1U, 32U);

 	return *parent_rate / 32 * mult;
 }

 static int cpg_z_clk_set_rate(struct clk_hw *hw, unsigned long rate,
 			      unsigned long parent_rate)
 {
 	struct cpg_z_clk *zclk = to_z_clk(hw);
 	unsigned int mult;
 	u32 val, kick;
 	unsigned int i;

 	mult = div_u64((u64)rate * 32, parent_rate);
 	mult = clamp(mult, 1U, 32U);

 	if (readl(zclk->kick_reg) & CPG_FRQCRB_KICK)
 		return -EBUSY;

 	val = readl(zclk->reg);
 	val &= ~CPG_FRQCRC_ZFC_MASK;
 	val |= (32 - mult) << CPG_FRQCRC_ZFC_SHIFT;
 	writel(val, zclk->reg);

 	/*
 	 * Set KICK bit in FRQCRB to update hardware setting and wait for
 	 * clock change completion.
 	 */
 	kick = readl(zclk->kick_reg);
 	kick |= CPG_FRQCRB_KICK;
 	writel(kick, zclk->kick_reg);

 	/*
 	 * Note: There is no HW information about the worst case latency.
 	 *
 	 * Using experimental measurements, it seems that no more than
 	 * ~10 iterations are needed, independently of the CPU rate.
 	 * Since this value might be dependent on external xtal rate, pll1
 	 * rate or even the other emulation clocks rate, use 1000 as a
 	 * "super" safe value.
 	 */
 	for (i = 1000; i; i--) {
 		if (!(readl(zclk->kick_reg) & CPG_FRQCRB_KICK))
 			return 0;

 		cpu_relax();
 	}

 	return -ETIMEDOUT;
 }

 static const struct clk_ops cpg_z_clk_ops = {
 	.recalc_rate = cpg_z_clk_recalc_rate,
 	.round_rate = cpg_z_clk_round_rate,
 	.set_rate = cpg_z_clk_set_rate,
 };

 static struct clk * __init cpg_z_clk_register(const char *name,
 					      const char *parent_name,
 					      void __iomem *base)
 {
 	struct clk_init_data init;
 	struct cpg_z_clk *zclk;
 	struct clk *clk;

 	zclk = kzalloc(sizeof(*zclk), GFP_KERNEL);
 	if (!zclk)
 		return ERR_PTR(-ENOMEM);

 	init.name = name;
 	init.ops = &cpg_z_clk_ops;
 	init.flags = 0;
 	init.parent_names = &parent_name;
 	init.num_parents = 1;

 	zclk->reg = base + CPG_FRQCRC;
 	zclk->kick_reg = base + CPG_FRQCRB;
 	zclk->hw.init = &init;

 	clk = clk_register(NULL, &zclk->hw);
 	if (IS_ERR(clk))
 		kfree(zclk);

 	return clk;
 }

 static struct clk * __init cpg_rcan_clk_register(const char *name,
 						 const char *parent_name,
 						 void __iomem *base)
 {
 	struct clk_fixed_factor *fixed;
 	struct clk_gate *gate;
 	struct clk *clk;

 	fixed = kzalloc(sizeof(*fixed), GFP_KERNEL);
 	if (!fixed)
 		return ERR_PTR(-ENOMEM);

 	fixed->mult = 1;
 	fixed->div = 6;

 	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
 	if (!gate) {
 		kfree(fixed);
 		return ERR_PTR(-ENOMEM);
 	}

 	gate->reg = base + CPG_RCANCKCR;
 	gate->bit_idx = 8;
 	gate->flags = CLK_GATE_SET_TO_DISABLE;
 	gate->lock = &cpg_lock;

 	clk = clk_register_composite(NULL, name, &parent_name, 1, NULL, NULL,
 				     &fixed->hw, &clk_fixed_factor_ops,
 				     &gate->hw, &clk_gate_ops, 0);
 	if (IS_ERR(clk)) {
 		kfree(gate);
 		kfree(fixed);
 	}

 	return clk;
 }

 /* ADSP divisors */
 static const struct clk_div_table cpg_adsp_div_table[] = {
 	{  1,  3 }, {  2,  4 }, {  3,  6 }, {  4,  8 },
 	{  5, 12 }, {  6, 16 }, {  7, 18 }, {  8, 24 },
 	{ 10, 36 }, { 11, 48 }, {  0,  0 },
 };

 static struct clk * __init cpg_adsp_clk_register(const char *name,
 						 const char *parent_name,
 						 void __iomem *base)
 {
 	struct clk_divider *div;
 	struct clk_gate *gate;
 	struct clk *clk;

 	div = kzalloc(sizeof(*div), GFP_KERNEL);
 	if (!div)
 		return ERR_PTR(-ENOMEM);

 	div->reg = base + CPG_ADSPCKCR;
 	div->width = 4;
 	div->table = cpg_adsp_div_table;
 	div->lock = &cpg_lock;

 	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
 	if (!gate) {
 		kfree(div);
 		return ERR_PTR(-ENOMEM);
 	}

 	gate->reg = base + CPG_ADSPCKCR;
 	gate->bit_idx = 8;
 	gate->flags = CLK_GATE_SET_TO_DISABLE;
 	gate->lock = &cpg_lock;

 	clk = clk_register_composite(NULL, name, &parent_name, 1, NULL, NULL,
 				     &div->hw, &clk_divider_ops,
 				     &gate->hw, &clk_gate_ops, 0);
 	if (IS_ERR(clk)) {
 		kfree(gate);
 		kfree(div);
 	}

 	return clk;
 }

 /* SDHI divisors */
 static const struct clk_div_table cpg_sdh_div_table[] = {
 	{  0,  2 }, {  1,  3 }, {  2,  4 }, {  3,  6 },
 	{  4,  8 }, {  5, 12 }, {  6, 16 }, {  7, 18 },
 	{  8, 24 }, { 10, 36 }, { 11, 48 }, {  0,  0 },
 };

 static const struct clk_div_table cpg_sd01_div_table[] = {
 	{  4,  8 }, {  5, 12 }, {  6, 16 }, {  7, 18 },
 	{  8, 24 }, { 10, 36 }, { 11, 48 }, { 12, 10 },
 	{  0,  0 },
 };

 static const struct rcar_gen2_cpg_pll_config *cpg_pll_config __initdata;
 static unsigned int cpg_pll0_div __initdata;
 static u32 cpg_mode __initdata;

 struct clk * __init rcar_gen2_cpg_clk_register(struct device *dev,
 					       const struct cpg_core_clk *core,
 					       const struct cpg_mssr_info *info,
 					       struct clk **clks,
 					       void __iomem *base)
 {
 	const struct clk_div_table *table = NULL;
 	const struct clk *parent;
 	const char *parent_name;
 	unsigned int mult = 1;
 	unsigned int div = 1;
 	unsigned int shift;

 	parent = clks[core->parent];
 	if (IS_ERR(parent))
 		return ERR_CAST(parent);

 	parent_name = __clk_get_name(parent);

 	switch (core->type) {
 	/* R-Car Gen2 */
 	case CLK_TYPE_GEN2_MAIN:
 		div = cpg_pll_config->extal_div;
 		break;

 	case CLK_TYPE_GEN2_PLL0:
 		/*
 		 * PLL0 is a  configurable multiplier clock except on R-Car
 		 * V2H/E2. Register the PLL0 clock as a fixed factor clock for
 		 * now as there's no generic multiplier clock implementation and
 		 * we  currently  have no need to change  the multiplier value.
 		 */
 		mult = cpg_pll_config->pll0_mult;
 		div  = cpg_pll0_div;
 		if (!mult) {
 			u32 pll0cr = readl(base + CPG_PLL0CR);

 			mult = (((pll0cr & CPG_PLL0CR_STC_MASK) >>
 				 CPG_PLL0CR_STC_SHIFT) + 1) * 2;
 		}
 		break;

 	case CLK_TYPE_GEN2_PLL1:
 		mult = cpg_pll_config->pll1_mult / 2;
 		break;

 	case CLK_TYPE_GEN2_PLL3:
 		mult = cpg_pll_config->pll3_mult;
 		break;

 	case CLK_TYPE_GEN2_Z:
 		return cpg_z_clk_register(core->name, parent_name, base);

 	case CLK_TYPE_GEN2_LB:
 		div = cpg_mode & BIT(18) ? 36 : 24;
 		break;

 	case CLK_TYPE_GEN2_ADSP:
 		return cpg_adsp_clk_register(core->name, parent_name, base);

 	case CLK_TYPE_GEN2_SDH:
 		table = cpg_sdh_div_table;
 		shift = 8;
 		break;

 	case CLK_TYPE_GEN2_SD0:
 		table = cpg_sd01_div_table;
 		shift = 4;
 		break;

 	case CLK_TYPE_GEN2_SD1:
 		table = cpg_sd01_div_table;
 		shift = 0;
 		break;

 	case CLK_TYPE_GEN2_QSPI:
 		div = (cpg_mode & (BIT(3) | BIT(2) | BIT(1))) == BIT(2) ?
 		      8 : 10;
 		break;

 	case CLK_TYPE_GEN2_RCAN:
 		return cpg_rcan_clk_register(core->name, parent_name, base);

 	default:
 		return ERR_PTR(-EINVAL);
 	}

 	if (!table)
 		return clk_register_fixed_factor(NULL, core->name, parent_name,
 						 0, mult, div);
 	else
 		return clk_register_divider_table(NULL, core->name,
 						  parent_name, 0,
 						  base + CPG_SDCKCR, shift, 4,
 						  0, table, &cpg_lock);
 }

 int __init rcar_gen2_cpg_init(const struct rcar_gen2_cpg_pll_config *config,
 			      unsigned int pll0_div, u32 mode)
 {
 	cpg_pll_config = config;
 	cpg_pll0_div = pll0_div;
 	cpg_mode = mode;

 	spin_lock_init(&cpg_lock);

 	return 0;
 }
	/*
	* R-Car Gen2 Clock Pulse Generator
	*
	* Copyright (C) 2016 Cogent Embedded Inc.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 as published
	* by the Free Software Foundation.
	*/

	#include <linux/bug.h>
	#include <linux/clk.h>
	#include <linux/clk-provider.h>
	#include <linux/device.h>
	#include <linux/err.h>
	#include <linux/init.h>
	#include <linux/io.h>
	#include <linux/slab.h>

	#include "renesas-cpg-mssr.h"
	#include "rcar-gen2-cpg.h"

	#define CPG_FRQCRB 0x0004
	#define CPG_FRQCRB_KICK BIT(31)
	#define CPG_SDCKCR 0x0074
	#define CPG_PLL0CR 0x00d8
	#define CPG_PLL0CR_STC_SHIFT 24
	#define CPG_PLL0CR_STC_MASK (0x7f << CPG_PLL0CR_STC_SHIFT)
	#define CPG_FRQCRC 0x00e0
	#define CPG_FRQCRC_ZFC_SHIFT 8
	#define CPG_FRQCRC_ZFC_MASK (0x1f << CPG_FRQCRC_ZFC_SHIFT)
	#define CPG_ADSPCKCR 0x025c
	#define CPG_RCANCKCR 0x0270

	static spinlock_t cpg_lock;

	/*
	* Z Clock
	*
	* Traits of this clock:
	* prepare - clk_prepare only ensures that parents are prepared
	* enable - clk_enable only ensures that parents are enabled
	* rate - rate is adjustable. clk->rate = parent->rate * mult / 32
	* parent - fixed parent. No clk_set_parent support
	*/

	struct cpg_z_clk {
	struct clk_hw hw;
	void __iomem *reg;
	void __iomem *kick_reg;
	};

	#define to_z_clk(_hw) container_of(_hw, struct cpg_z_clk, hw)

	static unsigned long cpg_z_clk_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	struct cpg_z_clk *zclk = to_z_clk(hw);
	unsigned int mult;
	unsigned int val;

	val = (readl(zclk->reg) & CPG_FRQCRC_ZFC_MASK) >> CPG_FRQCRC_ZFC_SHIFT;
	mult = 32 - val;

	return div_u64((u64)parent_rate * mult, 32);
	}

	static long cpg_z_clk_round_rate(struct clk_hw *hw, unsigned long rate,
	unsigned long *parent_rate)
	{
	unsigned long prate = *parent_rate;
	unsigned int mult;

	if (!prate)
	prate = 1;

	mult = div_u64((u64)rate * 32, prate);
	mult = clamp(mult, 1U, 32U);

	return parent_rate / 32 mult;
	}

	static int cpg_z_clk_set_rate(struct clk_hw *hw, unsigned long rate,
	unsigned long parent_rate)
	{
	struct cpg_z_clk *zclk = to_z_clk(hw);
	unsigned int mult;
	u32 val, kick;
	unsigned int i;

	mult = div_u64((u64)rate * 32, parent_rate);
	mult = clamp(mult, 1U, 32U);

	if (readl(zclk->kick_reg) & CPG_FRQCRB_KICK)
	return -EBUSY;

	val = readl(zclk->reg);
	val &= ~CPG_FRQCRC_ZFC_MASK;
	val \|= (32 - mult) << CPG_FRQCRC_ZFC_SHIFT;
	writel(val, zclk->reg);

	/*
	* Set KICK bit in FRQCRB to update hardware setting and wait for
	* clock change completion.
	*/
	kick = readl(zclk->kick_reg);
	kick \|= CPG_FRQCRB_KICK;
	writel(kick, zclk->kick_reg);

	/*
	* Note: There is no HW information about the worst case latency.
	*
	* Using experimental measurements, it seems that no more than
	* ~10 iterations are needed, independently of the CPU rate.
	* Since this value might be dependent on external xtal rate, pll1
	* rate or even the other emulation clocks rate, use 1000 as a
	* "super" safe value.
	*/
	for (i = 1000; i; i--) {
	if (!(readl(zclk->kick_reg) & CPG_FRQCRB_KICK))
	return 0;

	cpu_relax();
	}

	return -ETIMEDOUT;
	}

	static const struct clk_ops cpg_z_clk_ops = {
	.recalc_rate = cpg_z_clk_recalc_rate,
	.round_rate = cpg_z_clk_round_rate,
	.set_rate = cpg_z_clk_set_rate,
	};

	static struct clk * __init cpg_z_clk_register(const char *name,
	const char *parent_name,
	void __iomem *base)
	{
	struct clk_init_data init;
	struct cpg_z_clk *zclk;
	struct clk *clk;

	zclk = kzalloc(sizeof(*zclk), GFP_KERNEL);
	if (!zclk)
	return ERR_PTR(-ENOMEM);

	init.name = name;
	init.ops = &cpg_z_clk_ops;
	init.flags = 0;
	init.parent_names = &parent_name;
	init.num_parents = 1;

	zclk->reg = base + CPG_FRQCRC;
	zclk->kick_reg = base + CPG_FRQCRB;
	zclk->hw.init = &init;

	clk = clk_register(NULL, &zclk->hw);
	if (IS_ERR(clk))
	kfree(zclk);

	return clk;
	}

	static struct clk * __init cpg_rcan_clk_register(const char *name,
	const char *parent_name,
	void __iomem *base)
	{
	struct clk_fixed_factor *fixed;
	struct clk_gate *gate;
	struct clk *clk;

	fixed = kzalloc(sizeof(*fixed), GFP_KERNEL);
	if (!fixed)
	return ERR_PTR(-ENOMEM);

	fixed->mult = 1;
	fixed->div = 6;

	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
	if (!gate) {
	kfree(fixed);
	return ERR_PTR(-ENOMEM);
	}

	gate->reg = base + CPG_RCANCKCR;
	gate->bit_idx = 8;
	gate->flags = CLK_GATE_SET_TO_DISABLE;
	gate->lock = &cpg_lock;

	clk = clk_register_composite(NULL, name, &parent_name, 1, NULL, NULL,
	&fixed->hw, &clk_fixed_factor_ops,
	&gate->hw, &clk_gate_ops, 0);
	if (IS_ERR(clk)) {
	kfree(gate);
	kfree(fixed);
	}

	return clk;
	}

	/* ADSP divisors */
	static const struct clk_div_table cpg_adsp_div_table[] = {
	{ 1, 3 }, { 2, 4 }, { 3, 6 }, { 4, 8 },
	{ 5, 12 }, { 6, 16 }, { 7, 18 }, { 8, 24 },
	{ 10, 36 }, { 11, 48 }, { 0, 0 },
	};

	static struct clk * __init cpg_adsp_clk_register(const char *name,
	const char *parent_name,
	void __iomem *base)
	{
	struct clk_divider *div;
	struct clk_gate *gate;
	struct clk *clk;

	div = kzalloc(sizeof(*div), GFP_KERNEL);
	if (!div)
	return ERR_PTR(-ENOMEM);

	div->reg = base + CPG_ADSPCKCR;
	div->width = 4;
	div->table = cpg_adsp_div_table;
	div->lock = &cpg_lock;

	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
	if (!gate) {
	kfree(div);
	return ERR_PTR(-ENOMEM);
	}

	gate->reg = base + CPG_ADSPCKCR;
	gate->bit_idx = 8;
	gate->flags = CLK_GATE_SET_TO_DISABLE;
	gate->lock = &cpg_lock;

	clk = clk_register_composite(NULL, name, &parent_name, 1, NULL, NULL,
	&div->hw, &clk_divider_ops,
	&gate->hw, &clk_gate_ops, 0);
	if (IS_ERR(clk)) {
	kfree(gate);
	kfree(div);
	}

	return clk;
	}

	/* SDHI divisors */
	static const struct clk_div_table cpg_sdh_div_table[] = {
	{ 0, 2 }, { 1, 3 }, { 2, 4 }, { 3, 6 },
	{ 4, 8 }, { 5, 12 }, { 6, 16 }, { 7, 18 },
	{ 8, 24 }, { 10, 36 }, { 11, 48 }, { 0, 0 },
	};

	static const struct clk_div_table cpg_sd01_div_table[] = {
	{ 4, 8 }, { 5, 12 }, { 6, 16 }, { 7, 18 },
	{ 8, 24 }, { 10, 36 }, { 11, 48 }, { 12, 10 },
	{ 0, 0 },
	};

	static const struct rcar_gen2_cpg_pll_config *cpg_pll_config __initdata;
	static unsigned int cpg_pll0_div __initdata;
	static u32 cpg_mode __initdata;

	struct clk * __init rcar_gen2_cpg_clk_register(struct device *dev,
	const struct cpg_core_clk *core,
	const struct cpg_mssr_info *info,
	struct clk **clks,
	void __iomem *base)
	{
	const struct clk_div_table *table = NULL;
	const struct clk *parent;
	const char *parent_name;
	unsigned int mult = 1;
	unsigned int div = 1;
	unsigned int shift;

	parent = clks[core->parent];
	if (IS_ERR(parent))
	return ERR_CAST(parent);

	parent_name = __clk_get_name(parent);

	switch (core->type) {
	/* R-Car Gen2 */
	case CLK_TYPE_GEN2_MAIN:
	div = cpg_pll_config->extal_div;
	break;

	case CLK_TYPE_GEN2_PLL0:
	/*
	* PLL0 is a configurable multiplier clock except on R-Car
	* V2H/E2. Register the PLL0 clock as a fixed factor clock for
	* now as there's no generic multiplier clock implementation and
	* we currently have no need to change the multiplier value.
	*/
	mult = cpg_pll_config->pll0_mult;
	div = cpg_pll0_div;
	if (!mult) {
	u32 pll0cr = readl(base + CPG_PLL0CR);

	mult = (((pll0cr & CPG_PLL0CR_STC_MASK) >>
	CPG_PLL0CR_STC_SHIFT) + 1) * 2;
	}
	break;

	case CLK_TYPE_GEN2_PLL1:
	mult = cpg_pll_config->pll1_mult / 2;
	break;

	case CLK_TYPE_GEN2_PLL3:
	mult = cpg_pll_config->pll3_mult;
	break;

	case CLK_TYPE_GEN2_Z:
	return cpg_z_clk_register(core->name, parent_name, base);

	case CLK_TYPE_GEN2_LB:
	div = cpg_mode & BIT(18) ? 36 : 24;
	break;

	case CLK_TYPE_GEN2_ADSP:
	return cpg_adsp_clk_register(core->name, parent_name, base);

	case CLK_TYPE_GEN2_SDH:
	table = cpg_sdh_div_table;
	shift = 8;
	break;

	case CLK_TYPE_GEN2_SD0:
	table = cpg_sd01_div_table;
	shift = 4;
	break;

	case CLK_TYPE_GEN2_SD1:
	table = cpg_sd01_div_table;
	shift = 0;
	break;

	case CLK_TYPE_GEN2_QSPI:
	div = (cpg_mode & (BIT(3) \| BIT(2) \| BIT(1))) == BIT(2) ?
	8 : 10;
	break;

	case CLK_TYPE_GEN2_RCAN:
	return cpg_rcan_clk_register(core->name, parent_name, base);

	default:
	return ERR_PTR(-EINVAL);
	}

	if (!table)
	return clk_register_fixed_factor(NULL, core->name, parent_name,
	0, mult, div);
	else
	return clk_register_divider_table(NULL, core->name,
	parent_name, 0,
	base + CPG_SDCKCR, shift, 4,
	0, table, &cpg_lock);
	}

	int __init rcar_gen2_cpg_init(const struct rcar_gen2_cpg_pll_config *config,
	unsigned int pll0_div, u32 mode)
	{
	cpg_pll_config = config;
	cpg_pll0_div = pll0_div;
	cpg_mode = mode;

	spin_lock_init(&cpg_lock);

	return 0;
	}