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path: root/drivers/clk/mediatek/clk-mtk.c
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Diffstat (limited to 'drivers/clk/mediatek/clk-mtk.c')
-rw-r--r--drivers/clk/mediatek/clk-mtk.c493
1 files changed, 493 insertions, 0 deletions
diff --git a/drivers/clk/mediatek/clk-mtk.c b/drivers/clk/mediatek/clk-mtk.c
new file mode 100644
index 0000000000..870b14ed8b
--- /dev/null
+++ b/drivers/clk/mediatek/clk-mtk.c
@@ -0,0 +1,493 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MediaTek common clock driver
+ *
+ * Copyright (C) 2018 MediaTek Inc.
+ * Author: Ryder Lee <ryder.lee@mediatek.com>
+ */
+
+#include <common.h>
+#include <clk-uclass.h>
+#include <div64.h>
+#include <dm.h>
+#include <asm/io.h>
+
+#include "clk-mtk.h"
+
+#define REG_CON0 0
+#define REG_CON1 4
+
+#define CON0_BASE_EN BIT(0)
+#define CON0_PWR_ON BIT(0)
+#define CON0_ISO_EN BIT(1)
+#define CON1_PCW_CHG BIT(31)
+
+#define POSTDIV_MASK 0x7
+#define INTEGER_BITS 7
+
+/* scpsys clock off control */
+#define CLK_SCP_CFG0 0x200
+#define CLK_SCP_CFG1 0x204
+#define SCP_ARMCK_OFF_EN GENMASK(9, 0)
+#define SCP_AXICK_DCM_DIS_EN BIT(0)
+#define SCP_AXICK_26M_SEL_EN BIT(4)
+
+/* shared functions */
+
+/*
+ * In case the rate change propagation to parent clocks is undesirable,
+ * this function is recursively called to find the parent to calculate
+ * the accurate frequency.
+ */
+static int mtk_clk_find_parent_rate(struct clk *clk, int id,
+ const struct driver *drv)
+{
+ struct clk parent = { .id = id, };
+
+ if (drv) {
+ struct udevice *dev;
+
+ if (uclass_get_device_by_driver(UCLASS_CLK, drv, &dev))
+ return -ENODEV;
+
+ parent.dev = dev;
+ } else {
+ parent.dev = clk->dev;
+ }
+
+ return clk_get_rate(&parent);
+}
+
+static int mtk_clk_mux_set_parent(void __iomem *base, u32 parent,
+ const struct mtk_composite *mux)
+{
+ u32 val, index = 0;
+
+ while (mux->parent[index] != parent)
+ if (++index == mux->num_parents)
+ return -EINVAL;
+
+ /* switch mux to a select parent */
+ val = readl(base + mux->mux_reg);
+ val &= ~(mux->mux_mask << mux->mux_shift);
+
+ val |= index << mux->mux_shift;
+ writel(val, base + mux->mux_reg);
+
+ return 0;
+}
+
+/* apmixedsys functions */
+
+static unsigned long __mtk_pll_recalc_rate(const struct mtk_pll_data *pll,
+ u32 fin, u32 pcw, int postdiv)
+{
+ int pcwbits = pll->pcwbits;
+ int pcwfbits;
+ u64 vco;
+ u8 c = 0;
+
+ /* The fractional part of the PLL divider. */
+ pcwfbits = pcwbits > INTEGER_BITS ? pcwbits - INTEGER_BITS : 0;
+
+ vco = (u64)fin * pcw;
+
+ if (pcwfbits && (vco & GENMASK(pcwfbits - 1, 0)))
+ c = 1;
+
+ vco >>= pcwfbits;
+
+ if (c)
+ vco++;
+
+ return ((unsigned long)vco + postdiv - 1) / postdiv;
+}
+
+/**
+ * MediaTek PLLs are configured through their pcw value. The pcw value
+ * describes a divider in the PLL feedback loop which consists of 7 bits
+ * for the integer part and the remaining bits (if present) for the
+ * fractional part. Also they have a 3 bit power-of-two post divider.
+ */
+static void mtk_pll_set_rate_regs(struct clk *clk, u32 pcw, int postdiv)
+{
+ struct mtk_clk_priv *priv = dev_get_priv(clk->dev);
+ const struct mtk_pll_data *pll = &priv->tree->plls[clk->id];
+ u32 val;
+
+ /* set postdiv */
+ val = readl(priv->base + pll->pd_reg);
+ val &= ~(POSTDIV_MASK << pll->pd_shift);
+ val |= (ffs(postdiv) - 1) << pll->pd_shift;
+
+ /* postdiv and pcw need to set at the same time if on same register */
+ if (pll->pd_reg != pll->pcw_reg) {
+ writel(val, priv->base + pll->pd_reg);
+ val = readl(priv->base + pll->pcw_reg);
+ }
+
+ /* set pcw */
+ val &= ~GENMASK(pll->pcw_shift + pll->pcwbits - 1, pll->pcw_shift);
+ val |= pcw << pll->pcw_shift;
+ val &= ~CON1_PCW_CHG;
+ writel(val, priv->base + pll->pcw_reg);
+
+ val |= CON1_PCW_CHG;
+ writel(val, priv->base + pll->pcw_reg);
+
+ udelay(20);
+}
+
+/**
+ * mtk_pll_calc_values - calculate good values for a given input frequency.
+ * @clk: The clk
+ * @pcw: The pcw value (output)
+ * @postdiv: The post divider (output)
+ * @freq: The desired target frequency
+ */
+static void mtk_pll_calc_values(struct clk *clk, u32 *pcw, u32 *postdiv,
+ u32 freq)
+{
+ struct mtk_clk_priv *priv = dev_get_priv(clk->dev);
+ const struct mtk_pll_data *pll = &priv->tree->plls[clk->id];
+ unsigned long fmin = 1000 * MHZ;
+ u64 _pcw;
+ u32 val;
+
+ if (freq > pll->fmax)
+ freq = pll->fmax;
+
+ for (val = 0; val < 5; val++) {
+ *postdiv = 1 << val;
+ if ((u64)freq * *postdiv >= fmin)
+ break;
+ }
+
+ /* _pcw = freq * postdiv / xtal_rate * 2^pcwfbits */
+ _pcw = ((u64)freq << val) << (pll->pcwbits - INTEGER_BITS);
+ do_div(_pcw, priv->tree->xtal2_rate);
+
+ *pcw = (u32)_pcw;
+}
+
+static ulong mtk_apmixedsys_set_rate(struct clk *clk, ulong rate)
+{
+ u32 pcw = 0;
+ u32 postdiv;
+
+ mtk_pll_calc_values(clk, &pcw, &postdiv, rate);
+ mtk_pll_set_rate_regs(clk, pcw, postdiv);
+
+ return 0;
+}
+
+static ulong mtk_apmixedsys_get_rate(struct clk *clk)
+{
+ struct mtk_clk_priv *priv = dev_get_priv(clk->dev);
+ const struct mtk_pll_data *pll = &priv->tree->plls[clk->id];
+ u32 postdiv;
+ u32 pcw;
+
+ postdiv = (readl(priv->base + pll->pd_reg) >> pll->pd_shift) &
+ POSTDIV_MASK;
+ postdiv = 1 << postdiv;
+
+ pcw = readl(priv->base + pll->pcw_reg) >> pll->pcw_shift;
+ pcw &= GENMASK(pll->pcwbits - 1, 0);
+
+ return __mtk_pll_recalc_rate(pll, priv->tree->xtal2_rate,
+ pcw, postdiv);
+}
+
+static int mtk_apmixedsys_enable(struct clk *clk)
+{
+ struct mtk_clk_priv *priv = dev_get_priv(clk->dev);
+ const struct mtk_pll_data *pll = &priv->tree->plls[clk->id];
+ u32 r;
+
+ r = readl(priv->base + pll->pwr_reg) | CON0_PWR_ON;
+ writel(r, priv->base + pll->pwr_reg);
+ udelay(1);
+
+ r = readl(priv->base + pll->pwr_reg) & ~CON0_ISO_EN;
+ writel(r, priv->base + pll->pwr_reg);
+ udelay(1);
+
+ r = readl(priv->base + pll->reg + REG_CON0);
+ r |= pll->en_mask;
+ writel(r, priv->base + pll->reg + REG_CON0);
+
+ udelay(20);
+
+ if (pll->flags & HAVE_RST_BAR) {
+ r = readl(priv->base + pll->reg + REG_CON0);
+ r |= pll->rst_bar_mask;
+ writel(r, priv->base + pll->reg + REG_CON0);
+ }
+
+ return 0;
+}
+
+static int mtk_apmixedsys_disable(struct clk *clk)
+{
+ struct mtk_clk_priv *priv = dev_get_priv(clk->dev);
+ const struct mtk_pll_data *pll = &priv->tree->plls[clk->id];
+ u32 r;
+
+ if (pll->flags & HAVE_RST_BAR) {
+ r = readl(priv->base + pll->reg + REG_CON0);
+ r &= ~pll->rst_bar_mask;
+ writel(r, priv->base + pll->reg + REG_CON0);
+ }
+
+ r = readl(priv->base + pll->reg + REG_CON0);
+ r &= ~CON0_BASE_EN;
+ writel(r, priv->base + pll->reg + REG_CON0);
+
+ r = readl(priv->base + pll->pwr_reg) | CON0_ISO_EN;
+ writel(r, priv->base + pll->pwr_reg);
+
+ r = readl(priv->base + pll->pwr_reg) & ~CON0_PWR_ON;
+ writel(r, priv->base + pll->pwr_reg);
+
+ return 0;
+}
+
+/* topckgen functions */
+
+static ulong mtk_factor_recalc_rate(const struct mtk_fixed_factor *fdiv,
+ ulong parent_rate)
+{
+ u64 rate = parent_rate * fdiv->mult;
+
+ do_div(rate, fdiv->div);
+
+ return rate;
+}
+
+static int mtk_topckgen_get_factor_rate(struct clk *clk, u32 off)
+{
+ struct mtk_clk_priv *priv = dev_get_priv(clk->dev);
+ const struct mtk_fixed_factor *fdiv = &priv->tree->fdivs[off];
+ ulong rate;
+
+ switch (fdiv->flags & CLK_PARENT_MASK) {
+ case CLK_PARENT_APMIXED:
+ rate = mtk_clk_find_parent_rate(clk, fdiv->parent,
+ DM_GET_DRIVER(mtk_clk_apmixedsys));
+ break;
+ case CLK_PARENT_TOPCKGEN:
+ rate = mtk_clk_find_parent_rate(clk, fdiv->parent, NULL);
+ break;
+
+ default:
+ rate = priv->tree->xtal_rate;
+ }
+
+ return mtk_factor_recalc_rate(fdiv, rate);
+}
+
+static int mtk_topckgen_get_mux_rate(struct clk *clk, u32 off)
+{
+ struct mtk_clk_priv *priv = dev_get_priv(clk->dev);
+ const struct mtk_composite *mux = &priv->tree->muxes[off];
+ u32 index;
+
+ index = readl(priv->base + mux->mux_reg);
+ index &= mux->mux_mask << mux->mux_shift;
+ index = index >> mux->mux_shift;
+
+ if (mux->parent[index])
+ return mtk_clk_find_parent_rate(clk, mux->parent[index],
+ NULL);
+
+ return priv->tree->xtal_rate;
+}
+
+static ulong mtk_topckgen_get_rate(struct clk *clk)
+{
+ struct mtk_clk_priv *priv = dev_get_priv(clk->dev);
+
+ if (clk->id < priv->tree->fdivs_offs)
+ return priv->tree->fclks[clk->id].rate;
+ else if (clk->id < priv->tree->muxes_offs)
+ return mtk_topckgen_get_factor_rate(clk, clk->id -
+ priv->tree->fdivs_offs);
+ else
+ return mtk_topckgen_get_mux_rate(clk, clk->id -
+ priv->tree->muxes_offs);
+}
+
+static int mtk_topckgen_enable(struct clk *clk)
+{
+ struct mtk_clk_priv *priv = dev_get_priv(clk->dev);
+ const struct mtk_composite *mux;
+ u32 val;
+
+ if (clk->id < priv->tree->muxes_offs)
+ return 0;
+
+ mux = &priv->tree->muxes[clk->id - priv->tree->muxes_offs];
+ if (mux->gate_shift < 0)
+ return 0;
+
+ /* enable clock gate */
+ val = readl(priv->base + mux->gate_reg);
+ val &= ~BIT(mux->gate_shift);
+ writel(val, priv->base + mux->gate_reg);
+
+ if (mux->flags & CLK_DOMAIN_SCPSYS) {
+ /* enable scpsys clock off control */
+ writel(SCP_ARMCK_OFF_EN, priv->base + CLK_SCP_CFG0);
+ writel(SCP_AXICK_DCM_DIS_EN | SCP_AXICK_26M_SEL_EN,
+ priv->base + CLK_SCP_CFG1);
+ }
+
+ return 0;
+}
+
+static int mtk_topckgen_disable(struct clk *clk)
+{
+ struct mtk_clk_priv *priv = dev_get_priv(clk->dev);
+ const struct mtk_composite *mux;
+ u32 val;
+
+ if (clk->id < priv->tree->muxes_offs)
+ return 0;
+
+ mux = &priv->tree->muxes[clk->id - priv->tree->muxes_offs];
+ if (mux->gate_shift < 0)
+ return 0;
+
+ /* disable clock gate */
+ val = readl(priv->base + mux->gate_reg);
+ val |= BIT(mux->gate_shift);
+ writel(val, priv->base + mux->gate_reg);
+
+ return 0;
+}
+
+static int mtk_topckgen_set_parent(struct clk *clk, struct clk *parent)
+{
+ struct mtk_clk_priv *priv = dev_get_priv(clk->dev);
+
+ if (clk->id < priv->tree->muxes_offs)
+ return 0;
+
+ return mtk_clk_mux_set_parent(priv->base, parent->id,
+ &priv->tree->muxes[clk->id - priv->tree->muxes_offs]);
+}
+
+/* CG functions */
+
+static int mtk_clk_gate_enable(struct clk *clk)
+{
+ struct mtk_cg_priv *priv = dev_get_priv(clk->dev);
+ const struct mtk_gate *gate = &priv->gates[clk->id];
+ u32 bit = BIT(gate->shift);
+
+ switch (gate->flags & CLK_GATE_MASK) {
+ case CLK_GATE_SETCLR:
+ writel(bit, priv->base + gate->regs->clr_ofs);
+ break;
+ case CLK_GATE_NO_SETCLR_INV:
+ clrsetbits_le32(priv->base + gate->regs->sta_ofs, bit, bit);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int mtk_clk_gate_disable(struct clk *clk)
+{
+ struct mtk_cg_priv *priv = dev_get_priv(clk->dev);
+ const struct mtk_gate *gate = &priv->gates[clk->id];
+ u32 bit = BIT(gate->shift);
+
+ switch (gate->flags & CLK_GATE_MASK) {
+ case CLK_GATE_SETCLR:
+ writel(bit, priv->base + gate->regs->set_ofs);
+ break;
+ case CLK_GATE_NO_SETCLR_INV:
+ clrsetbits_le32(priv->base + gate->regs->sta_ofs, bit, 0);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static ulong mtk_clk_gate_get_rate(struct clk *clk)
+{
+ struct mtk_cg_priv *priv = dev_get_priv(clk->dev);
+ const struct mtk_gate *gate = &priv->gates[clk->id];
+
+ switch (gate->flags & CLK_PARENT_MASK) {
+ case CLK_PARENT_APMIXED:
+ return mtk_clk_find_parent_rate(clk, gate->parent,
+ DM_GET_DRIVER(mtk_clk_apmixedsys));
+ break;
+ case CLK_PARENT_TOPCKGEN:
+ return mtk_clk_find_parent_rate(clk, gate->parent,
+ DM_GET_DRIVER(mtk_clk_topckgen));
+ break;
+
+ default:
+ return priv->tree->xtal_rate;
+ }
+}
+
+const struct clk_ops mtk_clk_apmixedsys_ops = {
+ .enable = mtk_apmixedsys_enable,
+ .disable = mtk_apmixedsys_disable,
+ .set_rate = mtk_apmixedsys_set_rate,
+ .get_rate = mtk_apmixedsys_get_rate,
+};
+
+const struct clk_ops mtk_clk_topckgen_ops = {
+ .enable = mtk_topckgen_enable,
+ .disable = mtk_topckgen_disable,
+ .get_rate = mtk_topckgen_get_rate,
+ .set_parent = mtk_topckgen_set_parent,
+};
+
+const struct clk_ops mtk_clk_gate_ops = {
+ .enable = mtk_clk_gate_enable,
+ .disable = mtk_clk_gate_disable,
+ .get_rate = mtk_clk_gate_get_rate,
+};
+
+int mtk_common_clk_init(struct udevice *dev,
+ const struct mtk_clk_tree *tree)
+{
+ struct mtk_clk_priv *priv = dev_get_priv(dev);
+
+ priv->base = dev_read_addr_ptr(dev);
+ if (!priv->base)
+ return -ENOENT;
+
+ priv->tree = tree;
+
+ return 0;
+}
+
+int mtk_common_clk_gate_init(struct udevice *dev,
+ const struct mtk_clk_tree *tree,
+ const struct mtk_gate *gates)
+{
+ struct mtk_cg_priv *priv = dev_get_priv(dev);
+
+ priv->base = dev_read_addr_ptr(dev);
+ if (!priv->base)
+ return -ENOENT;
+
+ priv->tree = tree;
+ priv->gates = gates;
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.0) at 2024-10-05 18:55:02 +0300