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path: root/drivers/clk/mediatek/clk-pll.c
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-rw-r--r--drivers/clk/mediatek/clk-pll.c449
1 files changed, 449 insertions, 0 deletions
diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
new file mode 100644
index 0000000000..513ab6b1b3
--- /dev/null
+++ b/drivers/clk/mediatek/clk-pll.c
@@ -0,0 +1,449 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: James Liao <jamesjj.liao@mediatek.com>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/container_of.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+
+#include "clk-pll.h"
+
+#define MHZ (1000 * 1000)
+
+#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 PCW_CHG_MASK BIT(31)
+
+#define AUDPLL_TUNER_EN BIT(31)
+
+/* default 7 bits integer, can be overridden with pcwibits. */
+#define INTEGER_BITS 7
+
+int mtk_pll_is_prepared(struct clk_hw *hw)
+{
+ struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
+
+ return (readl(pll->en_addr) & BIT(pll->data->pll_en_bit)) != 0;
+}
+
+static unsigned long __mtk_pll_recalc_rate(struct mtk_clk_pll *pll, u32 fin,
+ u32 pcw, int postdiv)
+{
+ int pcwbits = pll->data->pcwbits;
+ int pcwfbits = 0;
+ int ibits;
+ u64 vco;
+ u8 c = 0;
+
+ /* The fractional part of the PLL divider. */
+ ibits = pll->data->pcwibits ? pll->data->pcwibits : INTEGER_BITS;
+ if (pcwbits > ibits)
+ pcwfbits = pcwbits - ibits;
+
+ 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;
+}
+
+static void __mtk_pll_tuner_enable(struct mtk_clk_pll *pll)
+{
+ u32 r;
+
+ if (pll->tuner_en_addr) {
+ r = readl(pll->tuner_en_addr) | BIT(pll->data->tuner_en_bit);
+ writel(r, pll->tuner_en_addr);
+ } else if (pll->tuner_addr) {
+ r = readl(pll->tuner_addr) | AUDPLL_TUNER_EN;
+ writel(r, pll->tuner_addr);
+ }
+}
+
+static void __mtk_pll_tuner_disable(struct mtk_clk_pll *pll)
+{
+ u32 r;
+
+ if (pll->tuner_en_addr) {
+ r = readl(pll->tuner_en_addr) & ~BIT(pll->data->tuner_en_bit);
+ writel(r, pll->tuner_en_addr);
+ } else if (pll->tuner_addr) {
+ r = readl(pll->tuner_addr) & ~AUDPLL_TUNER_EN;
+ writel(r, pll->tuner_addr);
+ }
+}
+
+static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
+ int postdiv)
+{
+ u32 chg, val;
+
+ /* disable tuner */
+ __mtk_pll_tuner_disable(pll);
+
+ /* set postdiv */
+ val = readl(pll->pd_addr);
+ val &= ~(POSTDIV_MASK << pll->data->pd_shift);
+ val |= (ffs(postdiv) - 1) << pll->data->pd_shift;
+
+ /* postdiv and pcw need to set at the same time if on same register */
+ if (pll->pd_addr != pll->pcw_addr) {
+ writel(val, pll->pd_addr);
+ val = readl(pll->pcw_addr);
+ }
+
+ /* set pcw */
+ val &= ~GENMASK(pll->data->pcw_shift + pll->data->pcwbits - 1,
+ pll->data->pcw_shift);
+ val |= pcw << pll->data->pcw_shift;
+ writel(val, pll->pcw_addr);
+ chg = readl(pll->pcw_chg_addr) | PCW_CHG_MASK;
+ writel(chg, pll->pcw_chg_addr);
+ if (pll->tuner_addr)
+ writel(val + 1, pll->tuner_addr);
+
+ /* restore tuner_en */
+ __mtk_pll_tuner_enable(pll);
+
+ udelay(20);
+}
+
+/*
+ * mtk_pll_calc_values - calculate good values for a given input frequency.
+ * @pll: The pll
+ * @pcw: The pcw value (output)
+ * @postdiv: The post divider (output)
+ * @freq: The desired target frequency
+ * @fin: The input frequency
+ *
+ */
+void mtk_pll_calc_values(struct mtk_clk_pll *pll, u32 *pcw, u32 *postdiv,
+ u32 freq, u32 fin)
+{
+ unsigned long fmin = pll->data->fmin ? pll->data->fmin : (1000 * MHZ);
+ const struct mtk_pll_div_table *div_table = pll->data->div_table;
+ u64 _pcw;
+ int ibits;
+ u32 val;
+
+ if (freq > pll->data->fmax)
+ freq = pll->data->fmax;
+
+ if (div_table) {
+ if (freq > div_table[0].freq)
+ freq = div_table[0].freq;
+
+ for (val = 0; div_table[val + 1].freq != 0; val++) {
+ if (freq > div_table[val + 1].freq)
+ break;
+ }
+ *postdiv = 1 << val;
+ } else {
+ for (val = 0; val < 5; val++) {
+ *postdiv = 1 << val;
+ if ((u64)freq * *postdiv >= fmin)
+ break;
+ }
+ }
+
+ /* _pcw = freq * postdiv / fin * 2^pcwfbits */
+ ibits = pll->data->pcwibits ? pll->data->pcwibits : INTEGER_BITS;
+ _pcw = ((u64)freq << val) << (pll->data->pcwbits - ibits);
+ do_div(_pcw, fin);
+
+ *pcw = (u32)_pcw;
+}
+
+int mtk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
+ u32 pcw = 0;
+ u32 postdiv;
+
+ mtk_pll_calc_values(pll, &pcw, &postdiv, rate, parent_rate);
+ mtk_pll_set_rate_regs(pll, pcw, postdiv);
+
+ return 0;
+}
+
+unsigned long mtk_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
+{
+ struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
+ u32 postdiv;
+ u32 pcw;
+
+ postdiv = (readl(pll->pd_addr) >> pll->data->pd_shift) & POSTDIV_MASK;
+ postdiv = 1 << postdiv;
+
+ pcw = readl(pll->pcw_addr) >> pll->data->pcw_shift;
+ pcw &= GENMASK(pll->data->pcwbits - 1, 0);
+
+ return __mtk_pll_recalc_rate(pll, parent_rate, pcw, postdiv);
+}
+
+long mtk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
+ u32 pcw = 0;
+ int postdiv;
+
+ mtk_pll_calc_values(pll, &pcw, &postdiv, rate, *prate);
+
+ return __mtk_pll_recalc_rate(pll, *prate, pcw, postdiv);
+}
+
+int mtk_pll_prepare(struct clk_hw *hw)
+{
+ struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
+ u32 r;
+
+ r = readl(pll->pwr_addr) | CON0_PWR_ON;
+ writel(r, pll->pwr_addr);
+ udelay(1);
+
+ r = readl(pll->pwr_addr) & ~CON0_ISO_EN;
+ writel(r, pll->pwr_addr);
+ udelay(1);
+
+ r = readl(pll->en_addr) | BIT(pll->data->pll_en_bit);
+ writel(r, pll->en_addr);
+
+ if (pll->data->en_mask) {
+ r = readl(pll->base_addr + REG_CON0) | pll->data->en_mask;
+ writel(r, pll->base_addr + REG_CON0);
+ }
+
+ __mtk_pll_tuner_enable(pll);
+
+ udelay(20);
+
+ if (pll->data->flags & HAVE_RST_BAR) {
+ r = readl(pll->base_addr + REG_CON0);
+ r |= pll->data->rst_bar_mask;
+ writel(r, pll->base_addr + REG_CON0);
+ }
+
+ return 0;
+}
+
+void mtk_pll_unprepare(struct clk_hw *hw)
+{
+ struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
+ u32 r;
+
+ if (pll->data->flags & HAVE_RST_BAR) {
+ r = readl(pll->base_addr + REG_CON0);
+ r &= ~pll->data->rst_bar_mask;
+ writel(r, pll->base_addr + REG_CON0);
+ }
+
+ __mtk_pll_tuner_disable(pll);
+
+ if (pll->data->en_mask) {
+ r = readl(pll->base_addr + REG_CON0) & ~pll->data->en_mask;
+ writel(r, pll->base_addr + REG_CON0);
+ }
+
+ r = readl(pll->en_addr) & ~BIT(pll->data->pll_en_bit);
+ writel(r, pll->en_addr);
+
+ r = readl(pll->pwr_addr) | CON0_ISO_EN;
+ writel(r, pll->pwr_addr);
+
+ r = readl(pll->pwr_addr) & ~CON0_PWR_ON;
+ writel(r, pll->pwr_addr);
+}
+
+const struct clk_ops mtk_pll_ops = {
+ .is_prepared = mtk_pll_is_prepared,
+ .prepare = mtk_pll_prepare,
+ .unprepare = mtk_pll_unprepare,
+ .recalc_rate = mtk_pll_recalc_rate,
+ .round_rate = mtk_pll_round_rate,
+ .set_rate = mtk_pll_set_rate,
+};
+
+struct clk_hw *mtk_clk_register_pll_ops(struct mtk_clk_pll *pll,
+ const struct mtk_pll_data *data,
+ void __iomem *base,
+ const struct clk_ops *pll_ops)
+{
+ struct clk_init_data init = {};
+ int ret;
+ const char *parent_name = "clk26m";
+
+ pll->base_addr = base + data->reg;
+ pll->pwr_addr = base + data->pwr_reg;
+ pll->pd_addr = base + data->pd_reg;
+ pll->pcw_addr = base + data->pcw_reg;
+ if (data->pcw_chg_reg)
+ pll->pcw_chg_addr = base + data->pcw_chg_reg;
+ else
+ pll->pcw_chg_addr = pll->base_addr + REG_CON1;
+ if (data->tuner_reg)
+ pll->tuner_addr = base + data->tuner_reg;
+ if (data->tuner_en_reg || data->tuner_en_bit)
+ pll->tuner_en_addr = base + data->tuner_en_reg;
+ if (data->en_reg)
+ pll->en_addr = base + data->en_reg;
+ else
+ pll->en_addr = pll->base_addr + REG_CON0;
+ pll->hw.init = &init;
+ pll->data = data;
+
+ init.name = data->name;
+ init.flags = (data->flags & PLL_AO) ? CLK_IS_CRITICAL : 0;
+ init.ops = pll_ops;
+ if (data->parent_name)
+ init.parent_names = &data->parent_name;
+ else
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+
+ ret = clk_hw_register(NULL, &pll->hw);
+
+ if (ret)
+ return ERR_PTR(ret);
+
+ return &pll->hw;
+}
+
+struct clk_hw *mtk_clk_register_pll(const struct mtk_pll_data *data,
+ void __iomem *base)
+{
+ struct mtk_clk_pll *pll;
+ struct clk_hw *hw;
+
+ pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+ if (!pll)
+ return ERR_PTR(-ENOMEM);
+
+ hw = mtk_clk_register_pll_ops(pll, data, base, &mtk_pll_ops);
+ if (IS_ERR(hw))
+ kfree(pll);
+
+ return hw;
+}
+
+void mtk_clk_unregister_pll(struct clk_hw *hw)
+{
+ struct mtk_clk_pll *pll;
+
+ if (!hw)
+ return;
+
+ pll = to_mtk_clk_pll(hw);
+
+ clk_hw_unregister(hw);
+ kfree(pll);
+}
+
+int mtk_clk_register_plls(struct device_node *node,
+ const struct mtk_pll_data *plls, int num_plls,
+ struct clk_hw_onecell_data *clk_data)
+{
+ void __iomem *base;
+ int i;
+ struct clk_hw *hw;
+
+ base = of_iomap(node, 0);
+ if (!base) {
+ pr_err("%s(): ioremap failed\n", __func__);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < num_plls; i++) {
+ const struct mtk_pll_data *pll = &plls[i];
+
+ if (!IS_ERR_OR_NULL(clk_data->hws[pll->id])) {
+ pr_warn("%pOF: Trying to register duplicate clock ID: %d\n",
+ node, pll->id);
+ continue;
+ }
+
+ hw = mtk_clk_register_pll(pll, base);
+
+ if (IS_ERR(hw)) {
+ pr_err("Failed to register clk %s: %pe\n", pll->name,
+ hw);
+ goto err;
+ }
+
+ clk_data->hws[pll->id] = hw;
+ }
+
+ return 0;
+
+err:
+ while (--i >= 0) {
+ const struct mtk_pll_data *pll = &plls[i];
+
+ mtk_clk_unregister_pll(clk_data->hws[pll->id]);
+ clk_data->hws[pll->id] = ERR_PTR(-ENOENT);
+ }
+
+ iounmap(base);
+
+ return PTR_ERR(hw);
+}
+EXPORT_SYMBOL_GPL(mtk_clk_register_plls);
+
+__iomem void *mtk_clk_pll_get_base(struct clk_hw *hw,
+ const struct mtk_pll_data *data)
+{
+ struct mtk_clk_pll *pll = to_mtk_clk_pll(hw);
+
+ return pll->base_addr - data->reg;
+}
+
+void mtk_clk_unregister_plls(const struct mtk_pll_data *plls, int num_plls,
+ struct clk_hw_onecell_data *clk_data)
+{
+ __iomem void *base = NULL;
+ int i;
+
+ if (!clk_data)
+ return;
+
+ for (i = num_plls; i > 0; i--) {
+ const struct mtk_pll_data *pll = &plls[i - 1];
+
+ if (IS_ERR_OR_NULL(clk_data->hws[pll->id]))
+ continue;
+
+ /*
+ * This is quite ugly but unfortunately the clks don't have
+ * any device tied to them, so there's no place to store the
+ * pointer to the I/O region base address. We have to fetch
+ * it from one of the registered clks.
+ */
+ base = mtk_clk_pll_get_base(clk_data->hws[pll->id], pll);
+
+ mtk_clk_unregister_pll(clk_data->hws[pll->id]);
+ clk_data->hws[pll->id] = ERR_PTR(-ENOENT);
+ }
+
+ iounmap(base);
+}
+EXPORT_SYMBOL_GPL(mtk_clk_unregister_plls);
+
+MODULE_LICENSE("GPL");