1 files changed, 283 insertions, 0 deletions
diff --git a/drivers/clk/imx/clk-pllv4.c b/drivers/clk/imx/clk-pllv4.c
new file mode 100644
index 000000000..9b136c951
--- /dev/null
+++ b/drivers/clk/imx/clk-pllv4.c
@@ -0,0 +1,283 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ * Copyright 2017~2018 NXP
+ *
+ * Author: Dong Aisheng <aisheng.dong@nxp.com>
+ *
+ */
+
+#include <linux/bits.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/slab.h>
+
+#include "clk.h"
+
+/* PLL Control Status Register (xPLLCSR) */
+#define PLL_CSR_OFFSET		0x0
+#define PLL_VLD			BIT(24)
+#define PLL_EN			BIT(0)
+
+/* PLL Configuration Register (xPLLCFG) */
+#define PLL_CFG_OFFSET		0x08
+#define IMX8ULP_PLL_CFG_OFFSET	0x10
+#define BP_PLL_MULT		16
+#define BM_PLL_MULT		(0x7f << 16)
+
+/* PLL Numerator Register (xPLLNUM) */
+#define PLL_NUM_OFFSET		0x10
+#define IMX8ULP_PLL_NUM_OFFSET	0x1c
+
+/* PLL Denominator Register (xPLLDENOM) */
+#define PLL_DENOM_OFFSET	0x14
+#define IMX8ULP_PLL_DENOM_OFFSET	0x18
+
+#define MAX_MFD			0x3fffffff
+#define DEFAULT_MFD		1000000
+
+struct clk_pllv4 {
+	struct clk_hw	hw;
+	void __iomem	*base;
+	u32		cfg_offset;
+	u32		num_offset;
+	u32		denom_offset;
+	bool		use_mult_range;
+};
+
+/* Valid PLL MULT Table */
+static const int pllv4_mult_table[] = {33, 27, 22, 20, 17, 16};
+
+/* Valid PLL MULT range, (max, min) */
+static const int pllv4_mult_range[] = {54, 27};
+
+#define to_clk_pllv4(__hw) container_of(__hw, struct clk_pllv4, hw)
+
+#define LOCK_TIMEOUT_US		USEC_PER_MSEC
+
+static inline int clk_pllv4_wait_lock(struct clk_pllv4 *pll)
+{
+	u32 csr;
+
+	return readl_poll_timeout(pll->base  + PLL_CSR_OFFSET,
+				  csr, csr & PLL_VLD, 0, LOCK_TIMEOUT_US);
+}
+
+static int clk_pllv4_is_prepared(struct clk_hw *hw)
+{
+	struct clk_pllv4 *pll = to_clk_pllv4(hw);
+
+	if (readl_relaxed(pll->base) & PLL_EN)
+		return 1;
+
+	return 0;
+}
+
+static unsigned long clk_pllv4_recalc_rate(struct clk_hw *hw,
+					   unsigned long parent_rate)
+{
+	struct clk_pllv4 *pll = to_clk_pllv4(hw);
+	u32 mult, mfn, mfd;
+	u64 temp64;
+
+	mult = readl_relaxed(pll->base + pll->cfg_offset);
+	mult &= BM_PLL_MULT;
+	mult >>= BP_PLL_MULT;
+
+	mfn = readl_relaxed(pll->base + pll->num_offset);
+	mfd = readl_relaxed(pll->base + pll->denom_offset);
+	temp64 = parent_rate;
+	temp64 *= mfn;
+	do_div(temp64, mfd);
+
+	return (parent_rate * mult) + (u32)temp64;
+}
+
+static long clk_pllv4_round_rate(struct clk_hw *hw, unsigned long rate,
+				 unsigned long *prate)
+{
+	struct clk_pllv4 *pll = to_clk_pllv4(hw);
+	unsigned long parent_rate = *prate;
+	unsigned long round_rate, i;
+	u32 mfn, mfd = DEFAULT_MFD;
+	bool found = false;
+	u64 temp64;
+	u32 mult;
+
+	if (pll->use_mult_range) {
+		temp64 = (u64)rate;
+		do_div(temp64, parent_rate);
+		mult = temp64;
+		if (mult >= pllv4_mult_range[1] &&
+		    mult <= pllv4_mult_range[0]) {
+			round_rate = parent_rate * mult;
+			found = true;
+		}
+	} else {
+		for (i = 0; i < ARRAY_SIZE(pllv4_mult_table); i++) {
+			round_rate = parent_rate * pllv4_mult_table[i];
+			if (rate >= round_rate) {
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found) {
+		pr_warn("%s: unable to round rate %lu, parent rate %lu\n",
+			clk_hw_get_name(hw), rate, parent_rate);
+		return 0;
+	}
+
+	if (parent_rate <= MAX_MFD)
+		mfd = parent_rate;
+
+	temp64 = (u64)(rate - round_rate);
+	temp64 *= mfd;
+	do_div(temp64, parent_rate);
+	mfn = temp64;
+
+	/*
+	 * NOTE: The value of numerator must always be configured to be
+	 * less than the value of the denominator. If we can't get a proper
+	 * pair of mfn/mfd, we simply return the round_rate without using
+	 * the frac part.
+	 */
+	if (mfn >= mfd)
+		return round_rate;
+
+	temp64 = (u64)parent_rate;
+	temp64 *= mfn;
+	do_div(temp64, mfd);
+
+	return round_rate + (u32)temp64;
+}
+
+static bool clk_pllv4_is_valid_mult(struct clk_pllv4 *pll, unsigned int mult)
+{
+	int i;
+
+	/* check if mult is in valid MULT table */
+	if (pll->use_mult_range) {
+		if (mult >= pllv4_mult_range[1] &&
+		    mult <= pllv4_mult_range[0])
+			return true;
+	} else {
+		for (i = 0; i < ARRAY_SIZE(pllv4_mult_table); i++) {
+			if (pllv4_mult_table[i] == mult)
+				return true;
+		}
+	}
+
+	return false;
+}
+
+static int clk_pllv4_set_rate(struct clk_hw *hw, unsigned long rate,
+			      unsigned long parent_rate)
+{
+	struct clk_pllv4 *pll = to_clk_pllv4(hw);
+	u32 val, mult, mfn, mfd = DEFAULT_MFD;
+	u64 temp64;
+
+	mult = rate / parent_rate;
+
+	if (!clk_pllv4_is_valid_mult(pll, mult))
+		return -EINVAL;
+
+	if (parent_rate <= MAX_MFD)
+		mfd = parent_rate;
+
+	temp64 = (u64)(rate - mult * parent_rate);
+	temp64 *= mfd;
+	do_div(temp64, parent_rate);
+	mfn = temp64;
+
+	val = readl_relaxed(pll->base + pll->cfg_offset);
+	val &= ~BM_PLL_MULT;
+	val |= mult << BP_PLL_MULT;
+	writel_relaxed(val, pll->base + pll->cfg_offset);
+
+	writel_relaxed(mfn, pll->base + pll->num_offset);
+	writel_relaxed(mfd, pll->base + pll->denom_offset);
+
+	return 0;
+}
+
+static int clk_pllv4_prepare(struct clk_hw *hw)
+{
+	u32 val;
+	struct clk_pllv4 *pll = to_clk_pllv4(hw);
+
+	val = readl_relaxed(pll->base);
+	val |= PLL_EN;
+	writel_relaxed(val, pll->base);
+
+	return clk_pllv4_wait_lock(pll);
+}
+
+static void clk_pllv4_unprepare(struct clk_hw *hw)
+{
+	u32 val;
+	struct clk_pllv4 *pll = to_clk_pllv4(hw);
+
+	val = readl_relaxed(pll->base);
+	val &= ~PLL_EN;
+	writel_relaxed(val, pll->base);
+}
+
+static const struct clk_ops clk_pllv4_ops = {
+	.recalc_rate	= clk_pllv4_recalc_rate,
+	.round_rate	= clk_pllv4_round_rate,
+	.set_rate	= clk_pllv4_set_rate,
+	.prepare	= clk_pllv4_prepare,
+	.unprepare	= clk_pllv4_unprepare,
+	.is_prepared	= clk_pllv4_is_prepared,
+};
+
+struct clk_hw *imx_clk_hw_pllv4(enum imx_pllv4_type type, const char *name,
+		 const char *parent_name, void __iomem *base)
+{
+	struct clk_pllv4 *pll;
+	struct clk_hw *hw;
+	struct clk_init_data init;
+	int ret;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (!pll)
+		return ERR_PTR(-ENOMEM);
+
+	pll->base = base;
+
+	if (type == IMX_PLLV4_IMX8ULP ||
+	    type == IMX_PLLV4_IMX8ULP_1GHZ) {
+		pll->cfg_offset = IMX8ULP_PLL_CFG_OFFSET;
+		pll->num_offset = IMX8ULP_PLL_NUM_OFFSET;
+		pll->denom_offset = IMX8ULP_PLL_DENOM_OFFSET;
+		if (type == IMX_PLLV4_IMX8ULP_1GHZ)
+			pll->use_mult_range = true;
+	} else {
+		pll->cfg_offset = PLL_CFG_OFFSET;
+		pll->num_offset = PLL_NUM_OFFSET;
+		pll->denom_offset = PLL_DENOM_OFFSET;
+	}
+
+	init.name = name;
+	init.ops = &clk_pllv4_ops;
+	init.parent_names = &parent_name;
+	init.num_parents = 1;
+	init.flags = CLK_SET_RATE_GATE;
+
+	pll->hw.init = &init;
+
+	hw = &pll->hw;
+	ret = clk_hw_register(NULL, hw);
+	if (ret) {
+		kfree(pll);
+		hw = ERR_PTR(ret);
+	}
+
+	return hw;
+}
+EXPORT_SYMBOL_GPL(imx_clk_hw_pllv4);