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-rw-r--r--drivers/clk/rockchip/clk-pll.c258
-rw-r--r--drivers/clk/rockchip/clk.h23
2 files changed, 280 insertions, 1 deletions
diff --git a/drivers/clk/rockchip/clk-pll.c b/drivers/clk/rockchip/clk-pll.c
index 4881eb8a1576..b7e66c9dd9f2 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@sntech.de>
*
+ * Copyright (c) 2015 Rockchip Electronics Co. Ltd.
+ * Author: Xing Zheng <zhengxing@rock-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 +112,252 @@ 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
*/
@@ -376,7 +626,7 @@ 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 */
@@ -421,6 +671,12 @@ 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 dc8ecb2673b7..61e7b2d995f1 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@sntech.de>
*
+ * Copyright (c) 2015 Rockchip Electronics Co. Ltd.
+ * Author: Xing Zheng <zhengxing@rock-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;
};
/**