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Commit ea5d6a8d authored by Heiko Stuebner's avatar Heiko Stuebner Committed by Kukjin Kim
Browse files

clk: samsung: add plls used by the early s3c24xx cpus 



The manuals do not give them explicit names like in later socs, so more
generic names with a s3c2410-prefix were used for them.

As it was common to do so in the previous implementation, functionality
to change the pll rate is already included.

Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
Acked-by: default avatarMike Turquette <mturquette@linaro.org>
Acked-by: default avatarTomasz Figa <t.figa@samsung.com>
Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
parent 42637c59

drivers/clk/samsung/clk-pll.c

+182 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 


#include <linux/errno.h>

#include <linux/hrtimer.h>

#include <linux/delay.h>

#include "clk.h"

#include "clk-pll.h"
@@ -700,6 +701,169 @@ static const struct clk_ops samsung_pll6553_clk_ops = { 
	.recalc_rate = samsung_pll6553_recalc_rate,

};



/*

 * PLL Clock Type of S3C24XX before S3C2443

 */



#define PLLS3C2410_MDIV_MASK		(0xff)

#define PLLS3C2410_PDIV_MASK		(0x1f)

#define PLLS3C2410_SDIV_MASK		(0x3)

#define PLLS3C2410_MDIV_SHIFT		(12)

#define PLLS3C2410_PDIV_SHIFT		(4)

#define PLLS3C2410_SDIV_SHIFT		(0)



#define PLLS3C2410_ENABLE_REG_OFFSET	0x10



static unsigned long samsung_s3c2410_pll_recalc_rate(struct clk_hw *hw,

					unsigned long parent_rate)

{

	struct samsung_clk_pll *pll = to_clk_pll(hw);

	u32 pll_con, mdiv, pdiv, sdiv;

	u64 fvco = parent_rate;



	pll_con = __raw_readl(pll->con_reg);

	mdiv = (pll_con >> PLLS3C2410_MDIV_SHIFT) & PLLS3C2410_MDIV_MASK;

	pdiv = (pll_con >> PLLS3C2410_PDIV_SHIFT) & PLLS3C2410_PDIV_MASK;

	sdiv = (pll_con >> PLLS3C2410_SDIV_SHIFT) & PLLS3C2410_SDIV_MASK;



	fvco *= (mdiv + 8);

	do_div(fvco, (pdiv + 2) << sdiv);



	return (unsigned int)fvco;

}



static unsigned long samsung_s3c2440_mpll_recalc_rate(struct clk_hw *hw,

					unsigned long parent_rate)

{

	struct samsung_clk_pll *pll = to_clk_pll(hw);

	u32 pll_con, mdiv, pdiv, sdiv;

	u64 fvco = parent_rate;



	pll_con = __raw_readl(pll->con_reg);

	mdiv = (pll_con >> PLLS3C2410_MDIV_SHIFT) & PLLS3C2410_MDIV_MASK;

	pdiv = (pll_con >> PLLS3C2410_PDIV_SHIFT) & PLLS3C2410_PDIV_MASK;

	sdiv = (pll_con >> PLLS3C2410_SDIV_SHIFT) & PLLS3C2410_SDIV_MASK;



	fvco *= (2 * (mdiv + 8));

	do_div(fvco, (pdiv + 2) << sdiv);



	return (unsigned int)fvco;

}



static int samsung_s3c2410_pll_set_rate(struct clk_hw *hw, unsigned long drate,

					unsigned long prate)

{

	struct samsung_clk_pll *pll = to_clk_pll(hw);

	const struct samsung_pll_rate_table *rate;

	u32 tmp;



	/* Get required rate settings from table */

	rate = samsung_get_pll_settings(pll, drate);

	if (!rate) {

		pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__,

			drate, __clk_get_name(hw->clk));

		return -EINVAL;

	}



	tmp = __raw_readl(pll->con_reg);



	/* Change PLL PMS values */

	tmp &= ~((PLLS3C2410_MDIV_MASK << PLLS3C2410_MDIV_SHIFT) |

			(PLLS3C2410_PDIV_MASK << PLLS3C2410_PDIV_SHIFT) |

			(PLLS3C2410_SDIV_MASK << PLLS3C2410_SDIV_SHIFT));

	tmp |= (rate->mdiv << PLLS3C2410_MDIV_SHIFT) |

			(rate->pdiv << PLLS3C2410_PDIV_SHIFT) |

			(rate->sdiv << PLLS3C2410_SDIV_SHIFT);

	__raw_writel(tmp, pll->con_reg);



	/* Time to settle according to the manual */

	udelay(300);



	return 0;

}



static int samsung_s3c2410_pll_enable(struct clk_hw *hw, int bit, bool enable)

{

	struct samsung_clk_pll *pll = to_clk_pll(hw);

	u32 pll_en = __raw_readl(pll->lock_reg + PLLS3C2410_ENABLE_REG_OFFSET);

	u32 pll_en_orig = pll_en;



	if (enable)

		pll_en &= ~BIT(bit);

	else

		pll_en |= BIT(bit);



	__raw_writel(pll_en, pll->lock_reg + PLLS3C2410_ENABLE_REG_OFFSET);



	/* if we started the UPLL, then allow to settle */

	if (enable && (pll_en_orig & BIT(bit)))

		udelay(300);



	return 0;

}



static int samsung_s3c2410_mpll_enable(struct clk_hw *hw)

{

	return samsung_s3c2410_pll_enable(hw, 5, true);

}



static void samsung_s3c2410_mpll_disable(struct clk_hw *hw)

{

	samsung_s3c2410_pll_enable(hw, 5, false);

}



static int samsung_s3c2410_upll_enable(struct clk_hw *hw)

{

	return samsung_s3c2410_pll_enable(hw, 7, true);

}



static void samsung_s3c2410_upll_disable(struct clk_hw *hw)

{

	samsung_s3c2410_pll_enable(hw, 7, false);

}



static const struct clk_ops samsung_s3c2410_mpll_clk_min_ops = {

	.recalc_rate = samsung_s3c2410_pll_recalc_rate,

	.enable = samsung_s3c2410_mpll_enable,

	.disable = samsung_s3c2410_mpll_disable,

};



static const struct clk_ops samsung_s3c2410_upll_clk_min_ops = {

	.recalc_rate = samsung_s3c2410_pll_recalc_rate,

	.enable = samsung_s3c2410_upll_enable,

	.disable = samsung_s3c2410_upll_disable,

};



static const struct clk_ops samsung_s3c2440_mpll_clk_min_ops = {

	.recalc_rate = samsung_s3c2440_mpll_recalc_rate,

	.enable = samsung_s3c2410_mpll_enable,

	.disable = samsung_s3c2410_mpll_disable,

};



static const struct clk_ops samsung_s3c2410_mpll_clk_ops = {

	.recalc_rate = samsung_s3c2410_pll_recalc_rate,

	.enable = samsung_s3c2410_mpll_enable,

	.disable = samsung_s3c2410_mpll_disable,

	.round_rate = samsung_pll_round_rate,

	.set_rate = samsung_s3c2410_pll_set_rate,

};



static const struct clk_ops samsung_s3c2410_upll_clk_ops = {

	.recalc_rate = samsung_s3c2410_pll_recalc_rate,

	.enable = samsung_s3c2410_upll_enable,

	.disable = samsung_s3c2410_upll_disable,

	.round_rate = samsung_pll_round_rate,

	.set_rate = samsung_s3c2410_pll_set_rate,

};



static const struct clk_ops samsung_s3c2440_mpll_clk_ops = {

	.recalc_rate = samsung_s3c2440_mpll_recalc_rate,

	.enable = samsung_s3c2410_mpll_enable,

	.disable = samsung_s3c2410_mpll_disable,

	.round_rate = samsung_pll_round_rate,

	.set_rate = samsung_s3c2410_pll_set_rate,

};



/*

 * PLL2550x Clock Type

 */
@@ -866,6 +1030,24 @@ static void __init _samsung_clk_register_pll(struct samsung_pll_clock *pll_clk, 
		else

			init.ops = &samsung_pll46xx_clk_ops;

		break;

	case pll_s3c2410_mpll:

		if (!pll->rate_table)

			init.ops = &samsung_s3c2410_mpll_clk_min_ops;

		else

			init.ops = &samsung_s3c2410_mpll_clk_ops;

		break;

	case pll_s3c2410_upll:

		if (!pll->rate_table)

			init.ops = &samsung_s3c2410_upll_clk_min_ops;

		else

			init.ops = &samsung_s3c2410_upll_clk_ops;

		break;

	case pll_s3c2440_mpll:

		if (!pll->rate_table)

			init.ops = &samsung_s3c2440_mpll_clk_min_ops;

		else

			init.ops = &samsung_s3c2440_mpll_clk_ops;

		break;

	default:

		pr_warn("%s: Unknown pll type for pll clk %s\n",

			__func__, pll_clk->name);

drivers/clk/samsung/clk-pll.h

+3 −0
Original line number Diff line number Diff line
@@ -28,6 +28,9 @@ enum samsung_pll_type { 
	pll_6552,

	pll_6552_s3c2416,

	pll_6553,

	pll_s3c2410_mpll,

	pll_s3c2410_upll,

	pll_s3c2440_mpll,

};



#define PLL_35XX_RATE(_rate, _m, _p, _s)			\