1 files changed, 675 insertions, 0 deletions

diff --git a/drivers/clk/ti/fapll.c b/drivers/clk/ti/fapll.c
new file mode 100644
index 000000000..749c6b73a
--- /dev/null
+++ b/drivers/clk/ti/fapll.c
@@ -0,0 +1,675 @@
+/*
+ * 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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/math64.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/clk/ti.h>
+
+#include "clock.h"
+
+/* FAPLL Control Register PLL_CTRL */
+#define FAPLL_MAIN_MULT_N_SHIFT	16
+#define FAPLL_MAIN_DIV_P_SHIFT	8
+#define FAPLL_MAIN_LOCK		BIT(7)
+#define FAPLL_MAIN_PLLEN	BIT(3)
+#define FAPLL_MAIN_BP		BIT(2)
+#define FAPLL_MAIN_LOC_CTL	BIT(0)
+
+#define FAPLL_MAIN_MAX_MULT_N	0xffff
+#define FAPLL_MAIN_MAX_DIV_P	0xff
+#define FAPLL_MAIN_CLEAR_MASK	\
+	((FAPLL_MAIN_MAX_MULT_N << FAPLL_MAIN_MULT_N_SHIFT) | \
+	 (FAPLL_MAIN_DIV_P_SHIFT << FAPLL_MAIN_DIV_P_SHIFT) | \
+	 FAPLL_MAIN_LOC_CTL)
+
+/* FAPLL powerdown register PWD */
+#define FAPLL_PWD_OFFSET	4
+
+#define MAX_FAPLL_OUTPUTS	7
+#define FAPLL_MAX_RETRIES	1000
+
+#define to_fapll(_hw)		container_of(_hw, struct fapll_data, hw)
+#define to_synth(_hw)		container_of(_hw, struct fapll_synth, hw)
+
+/* The bypass bit is inverted on the ddr_pll.. */
+#define fapll_is_ddr_pll(va)	(((u32)(va) & 0xffff) == 0x0440)
+
+/*
+ * The audio_pll_clk1 input is hard wired to the 27MHz bypass clock,
+ * and the audio_pll_clk1 synthesizer is hardwared to 32KiHz output.
+ */
+#define is_ddr_pll_clk1(va)	(((u32)(va) & 0xffff) == 0x044c)
+#define is_audio_pll_clk1(va)	(((u32)(va) & 0xffff) == 0x04a8)
+
+/* Synthesizer divider register */
+#define SYNTH_LDMDIV1		BIT(8)
+
+/* Synthesizer frequency register */
+#define SYNTH_LDFREQ		BIT(31)
+
+#define SYNTH_PHASE_K		8
+#define SYNTH_MAX_INT_DIV	0xf
+#define SYNTH_MAX_DIV_M		0xff
+
+struct fapll_data {
+	struct clk_hw hw;
+	void __iomem *base;
+	const char *name;
+	struct clk *clk_ref;
+	struct clk *clk_bypass;
+	struct clk_onecell_data outputs;
+	bool bypass_bit_inverted;
+};
+
+struct fapll_synth {
+	struct clk_hw hw;
+	struct fapll_data *fd;
+	int index;
+	void __iomem *freq;
+	void __iomem *div;
+	const char *name;
+	struct clk *clk_pll;
+};
+
+static bool ti_fapll_clock_is_bypass(struct fapll_data *fd)
+{
+	u32 v = readl_relaxed(fd->base);
+
+	if (fd->bypass_bit_inverted)
+		return !(v & FAPLL_MAIN_BP);
+	else
+		return !!(v & FAPLL_MAIN_BP);
+}
+
+static void ti_fapll_set_bypass(struct fapll_data *fd)
+{
+	u32 v = readl_relaxed(fd->base);
+
+	if (fd->bypass_bit_inverted)
+		v &= ~FAPLL_MAIN_BP;
+	else
+		v |= FAPLL_MAIN_BP;
+	writel_relaxed(v, fd->base);
+}
+
+static void ti_fapll_clear_bypass(struct fapll_data *fd)
+{
+	u32 v = readl_relaxed(fd->base);
+
+	if (fd->bypass_bit_inverted)
+		v |= FAPLL_MAIN_BP;
+	else
+		v &= ~FAPLL_MAIN_BP;
+	writel_relaxed(v, fd->base);
+}
+
+static int ti_fapll_wait_lock(struct fapll_data *fd)
+{
+	int retries = FAPLL_MAX_RETRIES;
+	u32 v;
+
+	while ((v = readl_relaxed(fd->base))) {
+		if (v & FAPLL_MAIN_LOCK)
+			return 0;
+
+		if (retries-- <= 0)
+			break;
+
+		udelay(1);
+	}
+
+	pr_err("%s failed to lock\n", fd->name);
+
+	return -ETIMEDOUT;
+}
+
+static int ti_fapll_enable(struct clk_hw *hw)
+{
+	struct fapll_data *fd = to_fapll(hw);
+	u32 v = readl_relaxed(fd->base);
+
+	v |= FAPLL_MAIN_PLLEN;
+	writel_relaxed(v, fd->base);
+	ti_fapll_wait_lock(fd);
+
+	return 0;
+}
+
+static void ti_fapll_disable(struct clk_hw *hw)
+{
+	struct fapll_data *fd = to_fapll(hw);
+	u32 v = readl_relaxed(fd->base);
+
+	v &= ~FAPLL_MAIN_PLLEN;
+	writel_relaxed(v, fd->base);
+}
+
+static int ti_fapll_is_enabled(struct clk_hw *hw)
+{
+	struct fapll_data *fd = to_fapll(hw);
+	u32 v = readl_relaxed(fd->base);
+
+	return v & FAPLL_MAIN_PLLEN;
+}
+
+static unsigned long ti_fapll_recalc_rate(struct clk_hw *hw,
+					  unsigned long parent_rate)
+{
+	struct fapll_data *fd = to_fapll(hw);
+	u32 fapll_n, fapll_p, v;
+	u64 rate;
+
+	if (ti_fapll_clock_is_bypass(fd))
+		return parent_rate;
+
+	rate = parent_rate;
+
+	/* PLL pre-divider is P and multiplier is N */
+	v = readl_relaxed(fd->base);
+	fapll_p = (v >> 8) & 0xff;
+	if (fapll_p)
+		do_div(rate, fapll_p);
+	fapll_n = v >> 16;
+	if (fapll_n)
+		rate *= fapll_n;
+
+	return rate;
+}
+
+static u8 ti_fapll_get_parent(struct clk_hw *hw)
+{
+	struct fapll_data *fd = to_fapll(hw);
+
+	if (ti_fapll_clock_is_bypass(fd))
+		return 1;
+
+	return 0;
+}
+
+static int ti_fapll_set_div_mult(unsigned long rate,
+				 unsigned long parent_rate,
+				 u32 *pre_div_p, u32 *mult_n)
+{
+	/*
+	 * So far no luck getting decent clock with PLL divider,
+	 * PLL does not seem to lock and the signal does not look
+	 * right. It seems the divider can only be used together
+	 * with the multiplier?
+	 */
+	if (rate < parent_rate) {
+		pr_warn("FAPLL main divider rates unsupported\n");
+		return -EINVAL;
+	}
+
+	*mult_n = rate / parent_rate;
+	if (*mult_n > FAPLL_MAIN_MAX_MULT_N)
+		return -EINVAL;
+	*pre_div_p = 1;
+
+	return 0;
+}
+
+static long ti_fapll_round_rate(struct clk_hw *hw, unsigned long rate,
+				unsigned long *parent_rate)
+{
+	u32 pre_div_p, mult_n;
+	int error;
+
+	if (!rate)
+		return -EINVAL;
+
+	error = ti_fapll_set_div_mult(rate, *parent_rate,
+				      &pre_div_p, &mult_n);
+	if (error)
+		return error;
+
+	rate = *parent_rate / pre_div_p;
+	rate *= mult_n;
+
+	return rate;
+}
+
+static int ti_fapll_set_rate(struct clk_hw *hw, unsigned long rate,
+			     unsigned long parent_rate)
+{
+	struct fapll_data *fd = to_fapll(hw);
+	u32 pre_div_p, mult_n, v;
+	int error;
+
+	if (!rate)
+		return -EINVAL;
+
+	error = ti_fapll_set_div_mult(rate, parent_rate,
+				      &pre_div_p, &mult_n);
+	if (error)
+		return error;
+
+	ti_fapll_set_bypass(fd);
+	v = readl_relaxed(fd->base);
+	v &= ~FAPLL_MAIN_CLEAR_MASK;
+	v |= pre_div_p << FAPLL_MAIN_DIV_P_SHIFT;
+	v |= mult_n << FAPLL_MAIN_MULT_N_SHIFT;
+	writel_relaxed(v, fd->base);
+	if (ti_fapll_is_enabled(hw))
+		ti_fapll_wait_lock(fd);
+	ti_fapll_clear_bypass(fd);
+
+	return 0;
+}
+
+static const struct clk_ops ti_fapll_ops = {
+	.enable = ti_fapll_enable,
+	.disable = ti_fapll_disable,
+	.is_enabled = ti_fapll_is_enabled,
+	.recalc_rate = ti_fapll_recalc_rate,
+	.get_parent = ti_fapll_get_parent,
+	.round_rate = ti_fapll_round_rate,
+	.set_rate = ti_fapll_set_rate,
+};
+
+static int ti_fapll_synth_enable(struct clk_hw *hw)
+{
+	struct fapll_synth *synth = to_synth(hw);
+	u32 v = readl_relaxed(synth->fd->base + FAPLL_PWD_OFFSET);
+
+	v &= ~(1 << synth->index);
+	writel_relaxed(v, synth->fd->base + FAPLL_PWD_OFFSET);
+
+	return 0;
+}
+
+static void ti_fapll_synth_disable(struct clk_hw *hw)
+{
+	struct fapll_synth *synth = to_synth(hw);
+	u32 v = readl_relaxed(synth->fd->base + FAPLL_PWD_OFFSET);
+
+	v |= 1 << synth->index;
+	writel_relaxed(v, synth->fd->base + FAPLL_PWD_OFFSET);
+}
+
+static int ti_fapll_synth_is_enabled(struct clk_hw *hw)
+{
+	struct fapll_synth *synth = to_synth(hw);
+	u32 v = readl_relaxed(synth->fd->base + FAPLL_PWD_OFFSET);
+
+	return !(v & (1 << synth->index));
+}
+
+/*
+ * See dm816x TRM chapter 1.10.3 Flying Adder PLL fore more info
+ */
+static unsigned long ti_fapll_synth_recalc_rate(struct clk_hw *hw,
+						unsigned long parent_rate)
+{
+	struct fapll_synth *synth = to_synth(hw);
+	u32 synth_div_m;
+	u64 rate;
+
+	/* The audio_pll_clk1 is hardwired to produce 32.768KiHz clock */
+	if (!synth->div)
+		return 32768;
+
+	/*
+	 * PLL in bypass sets the synths in bypass mode too. The PLL rate
+	 * can be also be set to 27MHz, so we can't use parent_rate to
+	 * check for bypass mode.
+	 */
+	if (ti_fapll_clock_is_bypass(synth->fd))
+		return parent_rate;
+
+	rate = parent_rate;
+
+	/*
+	 * Synth frequency integer and fractional divider.
+	 * Note that the phase output K is 8, so the result needs
+	 * to be multiplied by SYNTH_PHASE_K.
+	 */
+	if (synth->freq) {
+		u32 v, synth_int_div, synth_frac_div, synth_div_freq;
+
+		v = readl_relaxed(synth->freq);
+		synth_int_div = (v >> 24) & 0xf;
+		synth_frac_div = v & 0xffffff;
+		synth_div_freq = (synth_int_div * 10000000) + synth_frac_div;
+		rate *= 10000000;
+		do_div(rate, synth_div_freq);
+		rate *= SYNTH_PHASE_K;
+	}
+
+	/* Synth post-divider M */
+	synth_div_m = readl_relaxed(synth->div) & SYNTH_MAX_DIV_M;
+
+	return DIV_ROUND_UP_ULL(rate, synth_div_m);
+}
+
+static unsigned long ti_fapll_synth_get_frac_rate(struct clk_hw *hw,
+						  unsigned long parent_rate)
+{
+	struct fapll_synth *synth = to_synth(hw);
+	unsigned long current_rate, frac_rate;
+	u32 post_div_m;
+
+	current_rate = ti_fapll_synth_recalc_rate(hw, parent_rate);
+	post_div_m = readl_relaxed(synth->div) & SYNTH_MAX_DIV_M;
+	frac_rate = current_rate * post_div_m;
+
+	return frac_rate;
+}
+
+static u32 ti_fapll_synth_set_frac_rate(struct fapll_synth *synth,
+					unsigned long rate,
+					unsigned long parent_rate)
+{
+	u32 post_div_m, synth_int_div = 0, synth_frac_div = 0, v;
+
+	post_div_m = DIV_ROUND_UP_ULL((u64)parent_rate * SYNTH_PHASE_K, rate);
+	post_div_m = post_div_m / SYNTH_MAX_INT_DIV;
+	if (post_div_m > SYNTH_MAX_DIV_M)
+		return -EINVAL;
+	if (!post_div_m)
+		post_div_m = 1;
+
+	for (; post_div_m < SYNTH_MAX_DIV_M; post_div_m++) {
+		synth_int_div = DIV_ROUND_UP_ULL((u64)parent_rate *
+						 SYNTH_PHASE_K *
+						 10000000,
+						 rate * post_div_m);
+		synth_frac_div = synth_int_div % 10000000;
+		synth_int_div /= 10000000;
+
+		if (synth_int_div <= SYNTH_MAX_INT_DIV)
+			break;
+	}
+
+	if (synth_int_div > SYNTH_MAX_INT_DIV)
+		return -EINVAL;
+
+	v = readl_relaxed(synth->freq);
+	v &= ~0x1fffffff;
+	v |= (synth_int_div & SYNTH_MAX_INT_DIV) << 24;
+	v |= (synth_frac_div & 0xffffff);
+	v |= SYNTH_LDFREQ;
+	writel_relaxed(v, synth->freq);
+
+	return post_div_m;
+}
+
+static long ti_fapll_synth_round_rate(struct clk_hw *hw, unsigned long rate,
+				      unsigned long *parent_rate)
+{
+	struct fapll_synth *synth = to_synth(hw);
+	struct fapll_data *fd = synth->fd;
+	unsigned long r;
+
+	if (ti_fapll_clock_is_bypass(fd) || !synth->div || !rate)
+		return -EINVAL;
+
+	/* Only post divider m available with no fractional divider? */
+	if (!synth->freq) {
+		unsigned long frac_rate;
+		u32 synth_post_div_m;
+
+		frac_rate = ti_fapll_synth_get_frac_rate(hw, *parent_rate);
+		synth_post_div_m = DIV_ROUND_UP(frac_rate, rate);
+		r = DIV_ROUND_UP(frac_rate, synth_post_div_m);
+		goto out;
+	}
+
+	r = *parent_rate * SYNTH_PHASE_K;
+	if (rate > r)
+		goto out;
+
+	r = DIV_ROUND_UP_ULL(r, SYNTH_MAX_INT_DIV * SYNTH_MAX_DIV_M);
+	if (rate < r)
+		goto out;
+
+	r = rate;
+out:
+	return r;
+}
+
+static int ti_fapll_synth_set_rate(struct clk_hw *hw, unsigned long rate,
+				   unsigned long parent_rate)
+{
+	struct fapll_synth *synth = to_synth(hw);
+	struct fapll_data *fd = synth->fd;
+	unsigned long frac_rate, post_rate = 0;
+	u32 post_div_m = 0, v;
+
+	if (ti_fapll_clock_is_bypass(fd) || !synth->div || !rate)
+		return -EINVAL;
+
+	/* Produce the rate with just post divider M? */
+	frac_rate = ti_fapll_synth_get_frac_rate(hw, parent_rate);
+	if (frac_rate < rate) {
+		if (!synth->freq)
+			return -EINVAL;
+	} else {
+		post_div_m = DIV_ROUND_UP(frac_rate, rate);
+		if (post_div_m && (post_div_m <= SYNTH_MAX_DIV_M))
+			post_rate = DIV_ROUND_UP(frac_rate, post_div_m);
+		if (!synth->freq && !post_rate)
+			return -EINVAL;
+	}
+
+	/* Need to recalculate the fractional divider? */
+	if ((post_rate != rate) && synth->freq)
+		post_div_m = ti_fapll_synth_set_frac_rate(synth,
+							  rate,
+							  parent_rate);
+
+	v = readl_relaxed(synth->div);
+	v &= ~SYNTH_MAX_DIV_M;
+	v |= post_div_m;
+	v |= SYNTH_LDMDIV1;
+	writel_relaxed(v, synth->div);
+
+	return 0;
+}
+
+static const struct clk_ops ti_fapll_synt_ops = {
+	.enable = ti_fapll_synth_enable,
+	.disable = ti_fapll_synth_disable,
+	.is_enabled = ti_fapll_synth_is_enabled,
+	.recalc_rate = ti_fapll_synth_recalc_rate,
+	.round_rate = ti_fapll_synth_round_rate,
+	.set_rate = ti_fapll_synth_set_rate,
+};
+
+static struct clk * __init ti_fapll_synth_setup(struct fapll_data *fd,
+						void __iomem *freq,
+						void __iomem *div,
+						int index,
+						const char *name,
+						const char *parent,
+						struct clk *pll_clk)
+{
+	struct clk_init_data *init;
+	struct fapll_synth *synth;
+	struct clk *clk = ERR_PTR(-ENOMEM);
+
+	init = kzalloc(sizeof(*init), GFP_KERNEL);
+	if (!init)
+		return ERR_PTR(-ENOMEM);
+
+	init->ops = &ti_fapll_synt_ops;
+	init->name = name;
+	init->parent_names = &parent;
+	init->num_parents = 1;
+
+	synth = kzalloc(sizeof(*synth), GFP_KERNEL);
+	if (!synth)
+		goto free;
+
+	synth->fd = fd;
+	synth->index = index;
+	synth->freq = freq;
+	synth->div = div;
+	synth->name = name;
+	synth->hw.init = init;
+	synth->clk_pll = pll_clk;
+
+	clk = clk_register(NULL, &synth->hw);
+	if (IS_ERR(clk)) {
+		pr_err("failed to register clock\n");
+		goto free;
+	}
+
+	return clk;
+
+free:
+	kfree(synth);
+	kfree(init);
+
+	return clk;
+}
+
+static void __init ti_fapll_setup(struct device_node *node)
+{
+	struct fapll_data *fd;
+	struct clk_init_data *init = NULL;
+	const char *parent_name[2];
+	struct clk *pll_clk;
+	const char *name;
+	int i;
+
+	fd = kzalloc(sizeof(*fd), GFP_KERNEL);
+	if (!fd)
+		return;
+
+	fd->outputs.clks = kzalloc(sizeof(struct clk *) *
+				   MAX_FAPLL_OUTPUTS + 1,
+				   GFP_KERNEL);
+	if (!fd->outputs.clks)
+		goto free;
+
+	init = kzalloc(sizeof(*init), GFP_KERNEL);
+	if (!init)
+		goto free;
+
+	init->ops = &ti_fapll_ops;
+	name = ti_dt_clk_name(node);
+	init->name = name;
+
+	init->num_parents = of_clk_get_parent_count(node);
+	if (init->num_parents != 2) {
+		pr_err("%pOFn must have two parents\n", node);
+		goto free;
+	}
+
+	of_clk_parent_fill(node, parent_name, 2);
+	init->parent_names = parent_name;
+
+	fd->clk_ref = of_clk_get(node, 0);
+	if (IS_ERR(fd->clk_ref)) {
+		pr_err("%pOFn could not get clk_ref\n", node);
+		goto free;
+	}
+
+	fd->clk_bypass = of_clk_get(node, 1);
+	if (IS_ERR(fd->clk_bypass)) {
+		pr_err("%pOFn could not get clk_bypass\n", node);
+		goto free;
+	}
+
+	fd->base = of_iomap(node, 0);
+	if (!fd->base) {
+		pr_err("%pOFn could not get IO base\n", node);
+		goto free;
+	}
+
+	if (fapll_is_ddr_pll(fd->base))
+		fd->bypass_bit_inverted = true;
+
+	fd->name = name;
+	fd->hw.init = init;
+
+	/* Register the parent PLL */
+	pll_clk = clk_register(NULL, &fd->hw);
+	if (IS_ERR(pll_clk))
+		goto unmap;
+
+	fd->outputs.clks[0] = pll_clk;
+	fd->outputs.clk_num++;
+
+	/*
+	 * Set up the child synthesizers starting at index 1 as the
+	 * PLL output is at index 0. We need to check the clock-indices
+	 * for numbering in case there are holes in the synth mapping,
+	 * and then probe the synth register to see if it has a FREQ
+	 * register available.
+	 */
+	for (i = 0; i < MAX_FAPLL_OUTPUTS; i++) {
+		const char *output_name;
+		void __iomem *freq, *div;
+		struct clk *synth_clk;
+		int output_instance;
+		u32 v;
+
+		if (of_property_read_string_index(node, "clock-output-names",
+						  i, &output_name))
+			continue;
+
+		if (of_property_read_u32_index(node, "clock-indices", i,
+					       &output_instance))
+			output_instance = i;
+
+		freq = fd->base + (output_instance * 8);
+		div = freq + 4;
+
+		/* Check for hardwired audio_pll_clk1 */
+		if (is_audio_pll_clk1(freq)) {
+			freq = NULL;
+			div = NULL;
+		} else {
+			/* Does the synthesizer have a FREQ register? */
+			v = readl_relaxed(freq);
+			if (!v)
+				freq = NULL;
+		}
+		synth_clk = ti_fapll_synth_setup(fd, freq, div, output_instance,
+						 output_name, name, pll_clk);
+		if (IS_ERR(synth_clk))
+			continue;
+
+		fd->outputs.clks[output_instance] = synth_clk;
+		fd->outputs.clk_num++;
+
+		clk_register_clkdev(synth_clk, output_name, NULL);
+	}
+
+	/* Register the child synthesizers as the FAPLL outputs */
+	of_clk_add_provider(node, of_clk_src_onecell_get, &fd->outputs);
+	/* Add clock alias for the outputs */
+
+	kfree(init);
+
+	return;
+
+unmap:
+	iounmap(fd->base);
+free:
+	if (fd->clk_bypass)
+		clk_put(fd->clk_bypass);
+	if (fd->clk_ref)
+		clk_put(fd->clk_ref);
+	kfree(fd->outputs.clks);
+	kfree(fd);
+	kfree(init);
+}
+
+CLK_OF_DECLARE(ti_fapll_clock, "ti,dm816-fapll-clock", ti_fapll_setup);