Message-ID: <14916166.7f8LDMraAK@phil>
Date:	Thu, 05 Nov 2015 00:50:45 +0100
From:	Heiko Stuebner <heiko@...ech.de>
To:	Xing Zheng <zhengxing@...k-chips.com>
Cc:	linux-rockchip@...ts.infradead.org,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>, linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v6.1 3/8] clk: rockchip: add new pll-type for rk3036 and similar socs

The rk3036's pll and clock are different with base on the rk3066(rk3188,
rk3288, rk3368 use it), there are different adjust foctors and control
registers, so these should be independent and separate from the series
of rk3066s.

Signed-off-by: Xing Zheng <zhengxing@...k-chips.com>
Reviewed-by: Heiko Stuebner <heiko@...ech.de>
---
Hi,

it looks like I described the change in a slightly wrong way on what
should move in which patch. I took the liberty in fixing that up
and moving the RK3036_EMMC_* etc defines to the clock-controller patch.

Like I said, this patch should add everything related to the new pll-type
and the other patch than everything for the rk3036 clock controller.

Heiko

 drivers/clk/rockchip/clk-pll.c | 249 ++++++++++++++++++++++++++++++++++++++++-
 drivers/clk/rockchip/clk.h     |  23 ++++
 2 files changed, 271 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/rockchip/clk-pll.c b/drivers/clk/rockchip/clk-pll.c
index 7737a1d..c7c07d1 100644
--- a/drivers/clk/rockchip/clk-pll.c
+++ b/drivers/clk/rockchip/clk-pll.c
@@ -2,6 +2,9 @@
  * Copyright (c) 2014 MundoReader S.L.
  * Author: Heiko Stuebner <heiko@...ech.de>
  *
+ * Copyright (c) 2015 Rockchip Electronics Co. Ltd.
+ * Author: Xing Zheng <zhengxing@...k-chips.com>
+ *
  * 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; either version 2 of the License, or
@@ -19,6 +22,7 @@
 #include <linux/delay.h>
 #include <linux/clk-provider.h>
 #include <linux/regmap.h>
+#include <linux/clk.h>
 #include "clk.h"
 
 #define PLL_MODE_MASK		0x3
@@ -108,6 +112,243 @@ static int rockchip_pll_wait_lock(struct rockchip_clk_pll *pll)
 }
 
 /**
+ * PLL used in RK3036
+ */
+
+#define RK3036_PLLCON(i)			(i * 0x4)
+#define RK3036_PLLCON0_FBDIV_MASK		0xfff
+#define RK3036_PLLCON0_FBDIV_SHIFT		0
+#define RK3036_PLLCON0_POSTDIV1_MASK		0x7
+#define RK3036_PLLCON0_POSTDIV1_SHIFT		12
+#define RK3036_PLLCON1_REFDIV_MASK		0x3f
+#define RK3036_PLLCON1_REFDIV_SHIFT		0
+#define RK3036_PLLCON1_POSTDIV2_MASK		0x7
+#define RK3036_PLLCON1_POSTDIV2_SHIFT		6
+#define RK3036_PLLCON1_DSMPD_MASK		0x1
+#define RK3036_PLLCON1_DSMPD_SHIFT		12
+#define RK3036_PLLCON2_FRAC_MASK		0xffffff
+#define RK3036_PLLCON2_FRAC_SHIFT		0
+
+#define RK3036_PLLCON1_PWRDOWN			(1 << 13)
+
+static void rockchip_rk3036_pll_get_params(struct rockchip_clk_pll *pll,
+					struct rockchip_pll_rate_table *rate)
+{
+	u32 pllcon;
+
+	pllcon = readl_relaxed(pll->reg_base + RK3036_PLLCON(0));
+	rate->fbdiv = ((pllcon >> RK3036_PLLCON0_FBDIV_SHIFT) & RK3036_PLLCON0_FBDIV_MASK);
+	rate->postdiv1 = ((pllcon >> RK3036_PLLCON0_POSTDIV1_SHIFT) & RK3036_PLLCON0_POSTDIV1_MASK);
+
+	pllcon = readl_relaxed(pll->reg_base + RK3036_PLLCON(1));
+	rate->refdiv = ((pllcon >> RK3036_PLLCON1_REFDIV_SHIFT) & RK3036_PLLCON1_REFDIV_MASK);
+	rate->postdiv2 = ((pllcon >> RK3036_PLLCON1_POSTDIV2_SHIFT) & RK3036_PLLCON1_POSTDIV2_MASK);
+	rate->dsmpd = ((pllcon >> RK3036_PLLCON1_DSMPD_SHIFT) & RK3036_PLLCON1_DSMPD_MASK);
+
+	pllcon = readl_relaxed(pll->reg_base + RK3036_PLLCON(2));
+	rate->frac = ((pllcon >> RK3036_PLLCON2_FRAC_SHIFT) & RK3036_PLLCON2_FRAC_MASK);
+}
+
+static unsigned long rockchip_rk3036_pll_recalc_rate(struct clk_hw *hw,
+						     unsigned long prate)
+{
+	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
+	struct rockchip_pll_rate_table cur;
+	u64 rate64 = prate;
+
+	rockchip_rk3036_pll_get_params(pll, &cur);
+
+	rate64 *= cur.fbdiv;
+	do_div(rate64, cur.refdiv);
+
+	if (cur.dsmpd == 0) {
+		/* fractional mode */
+		u64 frac_rate64 = prate * cur.frac;
+
+		do_div(frac_rate64, cur.refdiv);
+		rate64 += frac_rate64 >> 24;
+	}
+
+	do_div(rate64, cur.postdiv1);
+	do_div(rate64, cur.postdiv2);
+
+	return (unsigned long)rate64;
+}
+
+static int rockchip_rk3036_pll_set_params(struct rockchip_clk_pll *pll,
+				const struct rockchip_pll_rate_table *rate)
+{
+	const struct clk_ops *pll_mux_ops = pll->pll_mux_ops;
+	struct clk_mux *pll_mux = &pll->pll_mux;
+	struct rockchip_pll_rate_table cur;
+	u32 pllcon;
+	int rate_change_remuxed = 0;
+	int cur_parent;
+	int ret;
+
+	pr_debug("%s: rate settings for %lu fbdiv: %d, postdiv1: %d, refdiv: %d, postdiv2: %d, dsmpd: %d, frac: %d\n",
+		__func__, rate->rate, rate->fbdiv, rate->postdiv1, rate->refdiv,
+		rate->postdiv2, rate->dsmpd, rate->frac);
+
+	rockchip_rk3036_pll_get_params(pll, &cur);
+	cur.rate = 0;
+
+	cur_parent = pll_mux_ops->get_parent(&pll_mux->hw);
+	if (cur_parent == PLL_MODE_NORM) {
+		pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_SLOW);
+		rate_change_remuxed = 1;
+	}
+
+	/* update pll values */
+	writel_relaxed(HIWORD_UPDATE(rate->fbdiv, RK3036_PLLCON0_FBDIV_MASK,
+					  RK3036_PLLCON0_FBDIV_SHIFT) |
+		       HIWORD_UPDATE(rate->postdiv1, RK3036_PLLCON0_POSTDIV1_MASK,
+					     RK3036_PLLCON0_POSTDIV1_SHIFT),
+		       pll->reg_base + RK3036_PLLCON(0));
+
+	writel_relaxed(HIWORD_UPDATE(rate->refdiv, RK3036_PLLCON1_REFDIV_MASK,
+						   RK3036_PLLCON1_REFDIV_SHIFT) |
+		       HIWORD_UPDATE(rate->postdiv2, RK3036_PLLCON1_POSTDIV2_MASK,
+						     RK3036_PLLCON1_POSTDIV2_SHIFT) |
+		       HIWORD_UPDATE(rate->dsmpd, RK3036_PLLCON1_DSMPD_MASK,
+						  RK3036_PLLCON1_DSMPD_SHIFT),
+		       pll->reg_base + RK3036_PLLCON(1));
+
+	/* GPLL CON2 is not HIWORD_MASK */
+	pllcon = readl_relaxed(pll->reg_base + RK3036_PLLCON(2));
+	pllcon &= ~(RK3036_PLLCON2_FRAC_MASK << RK3036_PLLCON2_FRAC_SHIFT);
+	pllcon |= rate->frac << RK3036_PLLCON2_FRAC_SHIFT;
+	writel_relaxed(pllcon, pll->reg_base + RK3036_PLLCON(2));
+
+	/* wait for the pll to lock */
+	ret = rockchip_pll_wait_lock(pll);
+	if (ret) {
+		pr_warn("%s: pll update unsucessful, trying to restore old params\n",
+			__func__);
+		rockchip_rk3036_pll_set_params(pll, &cur);
+	}
+
+	if (rate_change_remuxed)
+		pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_NORM);
+
+	return ret;
+}
+
+static int rockchip_rk3036_pll_set_rate(struct clk_hw *hw, unsigned long drate,
+					unsigned long prate)
+{
+	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
+	const struct rockchip_pll_rate_table *rate;
+	unsigned long old_rate = rockchip_rk3036_pll_recalc_rate(hw, prate);
+	struct regmap *grf = rockchip_clk_get_grf();
+
+	if (IS_ERR(grf)) {
+		pr_debug("%s: grf regmap not available, aborting rate change\n",
+			 __func__);
+		return PTR_ERR(grf);
+	}
+
+	pr_debug("%s: changing %s from %lu to %lu with a parent rate of %lu\n",
+		 __func__, __clk_get_name(hw->clk), old_rate, drate, prate);
+
+	/* Get required rate settings from table */
+	rate = rockchip_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;
+	}
+
+	return rockchip_rk3036_pll_set_params(pll, rate);
+}
+
+static int rockchip_rk3036_pll_enable(struct clk_hw *hw)
+{
+	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
+
+	writel(HIWORD_UPDATE(0, RK3036_PLLCON1_PWRDOWN, 0),
+	       pll->reg_base + RK3036_PLLCON(1));
+
+	return 0;
+}
+
+static void rockchip_rk3036_pll_disable(struct clk_hw *hw)
+{
+	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
+
+	writel(HIWORD_UPDATE(RK3036_PLLCON1_PWRDOWN,
+			     RK3036_PLLCON1_PWRDOWN, 0),
+	       pll->reg_base + RK3036_PLLCON(1));
+}
+
+static int rockchip_rk3036_pll_is_enabled(struct clk_hw *hw)
+{
+	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
+	u32 pllcon = readl(pll->reg_base + RK3036_PLLCON(1));
+
+	return !(pllcon & RK3036_PLLCON1_PWRDOWN);
+}
+
+static void rockchip_rk3036_pll_init(struct clk_hw *hw)
+{
+	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
+	const struct rockchip_pll_rate_table *rate;
+	struct rockchip_pll_rate_table cur;
+	unsigned long drate;
+
+	if (!(pll->flags & ROCKCHIP_PLL_SYNC_RATE))
+		return;
+
+	drate = clk_hw_get_rate(hw);
+	rate = rockchip_get_pll_settings(pll, drate);
+
+	/* when no rate setting for the current rate, rely on clk_set_rate */
+	if (!rate)
+		return;
+
+	rockchip_rk3036_pll_get_params(pll, &cur);
+
+	pr_debug("%s: pll %s@%lu: Hz\n", __func__, __clk_get_name(hw->clk), drate);
+	pr_debug("old - fbdiv: %d, postdiv1: %d, refdiv: %d, postdiv2: %d, dsmpd: %d, frac: %d\n",
+		cur.fbdiv, cur.postdiv1, cur.refdiv, cur.postdiv2, cur.dsmpd, cur.frac);
+	pr_debug("new - fbdiv: %d, postdiv1: %d, refdiv: %d, postdiv2: %d, dsmpd: %d, frac: %d\n",
+		rate->fbdiv, rate->postdiv1, rate->refdiv, rate->postdiv2, rate->dsmpd, rate->frac);
+
+	if (rate->fbdiv != cur.fbdiv || rate->postdiv1 != cur.postdiv1 ||
+		rate->refdiv != cur.refdiv || rate->postdiv2 != cur.postdiv2 ||
+		rate->dsmpd != cur.dsmpd || rate->frac != cur.frac) {
+		struct clk *parent = clk_get_parent(hw->clk);
+
+		if (!parent) {
+			pr_warn("%s: parent of %s not available\n",
+				__func__, __clk_get_name(hw->clk));
+			return;
+		}
+
+		pr_debug("%s: pll %s: rate params do not match rate table, adjusting\n",
+			 __func__, __clk_get_name(hw->clk));
+		rockchip_rk3036_pll_set_params(pll, rate);
+	}
+}
+
+static const struct clk_ops rockchip_rk3036_pll_clk_norate_ops = {
+	.recalc_rate = rockchip_rk3036_pll_recalc_rate,
+	.enable = rockchip_rk3036_pll_enable,
+	.disable = rockchip_rk3036_pll_disable,
+	.is_enabled = rockchip_rk3036_pll_is_enabled,
+};
+
+static const struct clk_ops rockchip_rk3036_pll_clk_ops = {
+	.recalc_rate = rockchip_rk3036_pll_recalc_rate,
+	.round_rate = rockchip_pll_round_rate,
+	.set_rate = rockchip_rk3036_pll_set_rate,
+	.enable = rockchip_rk3036_pll_enable,
+	.disable = rockchip_rk3036_pll_disable,
+	.is_enabled = rockchip_rk3036_pll_is_enabled,
+	.init = rockchip_rk3036_pll_init,
+};
+
+/**
  * PLL used in RK3066, RK3188 and RK3288
  */
 
@@ -363,7 +604,7 @@ struct clk *rockchip_clk_register_pll(enum rockchip_pll_type pll_type,
 	pll_mux->lock = lock;
 	pll_mux->hw.init = &init;
 
-	if (pll_type == pll_rk3066)
+	if (pll_type == pll_rk3036 || pll_type == pll_rk3066)
 		pll_mux->flags |= CLK_MUX_HIWORD_MASK;
 
 	/* the actual muxing is xin24m, pll-output, xin32k */
@@ -408,6 +649,12 @@ struct clk *rockchip_clk_register_pll(enum rockchip_pll_type pll_type,
 	}
 
 	switch (pll_type) {
+	case pll_rk3036:
+		if (!pll->rate_table)
+			init.ops = &rockchip_rk3036_pll_clk_norate_ops;
+		else
+			init.ops = &rockchip_rk3036_pll_clk_ops;
+		break;
 	case pll_rk3066:
 		if (!pll->rate_table)
 			init.ops = &rockchip_rk3066_pll_clk_norate_ops;
diff --git a/drivers/clk/rockchip/clk.h b/drivers/clk/rockchip/clk.h
index dc8ecb2..61e7b2d 100644
--- a/drivers/clk/rockchip/clk.h
+++ b/drivers/clk/rockchip/clk.h
@@ -2,6 +2,9 @@
  * Copyright (c) 2014 MundoReader S.L.
  * Author: Heiko Stuebner <heiko@...ech.de>
  *
+ * Copyright (c) 2015 Rockchip Electronics Co. Ltd.
+ * Author: Xing Zheng <zhengxing@...k-chips.com>
+ *
  * based on
  *
  * samsung/clk.h
@@ -74,9 +77,22 @@ struct clk;
 #define RK3368_EMMC_CON1		0x41c
 
 enum rockchip_pll_type {
+	pll_rk3036,
 	pll_rk3066,
 };
 
+#define RK3036_PLL_RATE(_rate, _refdiv, _fbdiv, _postdiv1,	\
+			_postdiv2, _dsmpd, _frac)		\
+{								\
+	.rate	= _rate##U,					\
+	.fbdiv = _fbdiv,					\
+	.postdiv1 = _postdiv1,					\
+	.refdiv = _refdiv,					\
+	.postdiv2 = _postdiv2,					\
+	.dsmpd = _dsmpd,					\
+	.frac = _frac,						\
+}
+
 #define RK3066_PLL_RATE(_rate, _nr, _nf, _no)	\
 {						\
 	.rate	= _rate##U,			\
@@ -101,6 +117,13 @@ struct rockchip_pll_rate_table {
 	unsigned int nf;
 	unsigned int no;
 	unsigned int nb;
+	/* for RK3036 */
+	unsigned int fbdiv;
+	unsigned int postdiv1;
+	unsigned int refdiv;
+	unsigned int postdiv2;
+	unsigned int dsmpd;
+	unsigned int frac;
 };
 
 /**
-- 
2.6.2


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