Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 733 insertions, 0 deletions

diff --git a/arch/arm/mach-ep93xx/clock.c b/arch/arm/mach-ep93xx/clock.c
new file mode 100644
index 000000000..85a496ddc
--- /dev/null
+++ b/arch/arm/mach-ep93xx/clock.c
@@ -0,0 +1,733 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * arch/arm/mach-ep93xx/clock.c
+ * Clock control for Cirrus EP93xx chips.
+ *
+ * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
+ */
+
+#define pr_fmt(fmt) "ep93xx " KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/soc/cirrus/ep93xx.h>
+
+#include "hardware.h"
+
+#include <asm/div64.h>
+
+#include "soc.h"
+
+static DEFINE_SPINLOCK(clk_lock);
+
+static char fclk_divisors[] = { 1, 2, 4, 8, 16, 1, 1, 1 };
+static char hclk_divisors[] = { 1, 2, 4, 5, 6, 8, 16, 32 };
+static char pclk_divisors[] = { 1, 2, 4, 8 };
+
+static char adc_divisors[] = { 16, 4 };
+static char sclk_divisors[] = { 2, 4 };
+static char lrclk_divisors[] = { 32, 64, 128 };
+
+static const char * const mux_parents[] = {
+	"xtali",
+	"pll1",
+	"pll2"
+};
+
+/*
+ * PLL rate = 14.7456 MHz * (X1FBD + 1) * (X2FBD + 1) / (X2IPD + 1) / 2^PS
+ */
+static unsigned long calc_pll_rate(unsigned long long rate, u32 config_word)
+{
+	int i;
+
+	rate *= ((config_word >> 11) & 0x1f) + 1;		/* X1FBD */
+	rate *= ((config_word >> 5) & 0x3f) + 1;		/* X2FBD */
+	do_div(rate, (config_word & 0x1f) + 1);			/* X2IPD */
+	for (i = 0; i < ((config_word >> 16) & 3); i++)		/* PS */
+		rate >>= 1;
+
+	return (unsigned long)rate;
+}
+
+struct clk_psc {
+	struct clk_hw hw;
+	void __iomem *reg;
+	u8 bit_idx;
+	u32 mask;
+	u8 shift;
+	u8 width;
+	char *div;
+	u8 num_div;
+	spinlock_t *lock;
+};
+
+#define to_clk_psc(_hw) container_of(_hw, struct clk_psc, hw)
+
+static int ep93xx_clk_is_enabled(struct clk_hw *hw)
+{
+	struct clk_psc *psc = to_clk_psc(hw);
+	u32 val = readl(psc->reg);
+
+	return (val & BIT(psc->bit_idx)) ? 1 : 0;
+}
+
+static int ep93xx_clk_enable(struct clk_hw *hw)
+{
+	struct clk_psc *psc = to_clk_psc(hw);
+	unsigned long flags = 0;
+	u32 val;
+
+	if (psc->lock)
+		spin_lock_irqsave(psc->lock, flags);
+
+	val = __raw_readl(psc->reg);
+	val |= BIT(psc->bit_idx);
+
+	ep93xx_syscon_swlocked_write(val, psc->reg);
+
+	if (psc->lock)
+		spin_unlock_irqrestore(psc->lock, flags);
+
+	return 0;
+}
+
+static void ep93xx_clk_disable(struct clk_hw *hw)
+{
+	struct clk_psc *psc = to_clk_psc(hw);
+	unsigned long flags = 0;
+	u32 val;
+
+	if (psc->lock)
+		spin_lock_irqsave(psc->lock, flags);
+
+	val = __raw_readl(psc->reg);
+	val &= ~BIT(psc->bit_idx);
+
+	ep93xx_syscon_swlocked_write(val, psc->reg);
+
+	if (psc->lock)
+		spin_unlock_irqrestore(psc->lock, flags);
+}
+
+static const struct clk_ops clk_ep93xx_gate_ops = {
+	.enable = ep93xx_clk_enable,
+	.disable = ep93xx_clk_disable,
+	.is_enabled = ep93xx_clk_is_enabled,
+};
+
+static struct clk_hw *ep93xx_clk_register_gate(const char *name,
+				    const char *parent_name,
+				    void __iomem *reg,
+				    u8 bit_idx)
+{
+	struct clk_init_data init;
+	struct clk_psc *psc;
+	struct clk *clk;
+
+	psc = kzalloc(sizeof(*psc), GFP_KERNEL);
+	if (!psc)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &clk_ep93xx_gate_ops;
+	init.flags = CLK_SET_RATE_PARENT;
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+
+	psc->reg = reg;
+	psc->bit_idx = bit_idx;
+	psc->hw.init = &init;
+	psc->lock = &clk_lock;
+
+	clk = clk_register(NULL, &psc->hw);
+	if (IS_ERR(clk)) {
+		kfree(psc);
+		return ERR_CAST(clk);
+	}
+
+	return &psc->hw;
+}
+
+static u8 ep93xx_mux_get_parent(struct clk_hw *hw)
+{
+	struct clk_psc *psc = to_clk_psc(hw);
+	u32 val = __raw_readl(psc->reg);
+
+	if (!(val & EP93XX_SYSCON_CLKDIV_ESEL))
+		return 0;
+
+	if (!(val & EP93XX_SYSCON_CLKDIV_PSEL))
+		return 1;
+
+	return 2;
+}
+
+static int ep93xx_mux_set_parent_lock(struct clk_hw *hw, u8 index)
+{
+	struct clk_psc *psc = to_clk_psc(hw);
+	unsigned long flags = 0;
+	u32 val;
+
+	if (index >= ARRAY_SIZE(mux_parents))
+		return -EINVAL;
+
+	if (psc->lock)
+		spin_lock_irqsave(psc->lock, flags);
+
+	val = __raw_readl(psc->reg);
+	val &= ~(EP93XX_SYSCON_CLKDIV_ESEL | EP93XX_SYSCON_CLKDIV_PSEL);
+
+
+	if (index != 0) {
+		val |= EP93XX_SYSCON_CLKDIV_ESEL;
+		val |= (index - 1) ? EP93XX_SYSCON_CLKDIV_PSEL : 0;
+	}
+
+	ep93xx_syscon_swlocked_write(val, psc->reg);
+
+	if (psc->lock)
+		spin_unlock_irqrestore(psc->lock, flags);
+
+	return 0;
+}
+
+static bool is_best(unsigned long rate, unsigned long now,
+		     unsigned long best)
+{
+	return abs(rate - now) < abs(rate - best);
+}
+
+static int ep93xx_mux_determine_rate(struct clk_hw *hw,
+				struct clk_rate_request *req)
+{
+	unsigned long rate = req->rate;
+	struct clk *best_parent = NULL;
+	unsigned long __parent_rate;
+	unsigned long best_rate = 0, actual_rate, mclk_rate;
+	unsigned long best_parent_rate;
+	int __div = 0, __pdiv = 0;
+	int i;
+
+	/*
+	 * Try the two pll's and the external clock
+	 * Because the valid predividers are 2, 2.5 and 3, we multiply
+	 * all the clocks by 2 to avoid floating point math.
+	 *
+	 * This is based on the algorithm in the ep93xx raster guide:
+	 * http://be-a-maverick.com/en/pubs/appNote/AN269REV1.pdf
+	 *
+	 */
+	for (i = 0; i < ARRAY_SIZE(mux_parents); i++) {
+		struct clk *parent = clk_get_sys(mux_parents[i], NULL);
+
+		__parent_rate = clk_get_rate(parent);
+		mclk_rate = __parent_rate * 2;
+
+		/* Try each predivider value */
+		for (__pdiv = 4; __pdiv <= 6; __pdiv++) {
+			__div = mclk_rate / (rate * __pdiv);
+			if (__div < 2 || __div > 127)
+				continue;
+
+			actual_rate = mclk_rate / (__pdiv * __div);
+			if (is_best(rate, actual_rate, best_rate)) {
+				best_rate = actual_rate;
+				best_parent_rate = __parent_rate;
+				best_parent = parent;
+			}
+		}
+	}
+
+	if (!best_parent)
+		return -EINVAL;
+
+	req->best_parent_rate = best_parent_rate;
+	req->best_parent_hw = __clk_get_hw(best_parent);
+	req->rate = best_rate;
+
+	return 0;
+}
+
+static unsigned long ep93xx_ddiv_recalc_rate(struct clk_hw *hw,
+						unsigned long parent_rate)
+{
+	struct clk_psc *psc = to_clk_psc(hw);
+	unsigned long rate = 0;
+	u32 val = __raw_readl(psc->reg);
+	int __pdiv = ((val >> EP93XX_SYSCON_CLKDIV_PDIV_SHIFT) & 0x03);
+	int __div = val & 0x7f;
+
+	if (__div > 0)
+		rate = (parent_rate * 2) / ((__pdiv + 3) * __div);
+
+	return rate;
+}
+
+static int ep93xx_ddiv_set_rate(struct clk_hw *hw, unsigned long rate,
+				unsigned long parent_rate)
+{
+	struct clk_psc *psc = to_clk_psc(hw);
+	int pdiv = 0, div = 0;
+	unsigned long best_rate = 0, actual_rate, mclk_rate;
+	int __div = 0, __pdiv = 0;
+	u32 val;
+
+	mclk_rate = parent_rate * 2;
+
+	for (__pdiv = 4; __pdiv <= 6; __pdiv++) {
+		__div = mclk_rate / (rate * __pdiv);
+		if (__div < 2 || __div > 127)
+			continue;
+
+		actual_rate = mclk_rate / (__pdiv * __div);
+		if (is_best(rate, actual_rate, best_rate)) {
+			pdiv = __pdiv - 3;
+			div = __div;
+			best_rate = actual_rate;
+		}
+	}
+
+	if (!best_rate)
+		return -EINVAL;
+
+	val = __raw_readl(psc->reg);
+
+	/* Clear old dividers */
+	val &= ~0x37f;
+
+	/* Set the new pdiv and div bits for the new clock rate */
+	val |= (pdiv << EP93XX_SYSCON_CLKDIV_PDIV_SHIFT) | div;
+	ep93xx_syscon_swlocked_write(val, psc->reg);
+
+	return 0;
+}
+
+static const struct clk_ops clk_ddiv_ops = {
+	.enable = ep93xx_clk_enable,
+	.disable = ep93xx_clk_disable,
+	.is_enabled = ep93xx_clk_is_enabled,
+	.get_parent = ep93xx_mux_get_parent,
+	.set_parent = ep93xx_mux_set_parent_lock,
+	.determine_rate = ep93xx_mux_determine_rate,
+	.recalc_rate = ep93xx_ddiv_recalc_rate,
+	.set_rate = ep93xx_ddiv_set_rate,
+};
+
+static struct clk_hw *clk_hw_register_ddiv(const char *name,
+					  void __iomem *reg,
+					  u8 bit_idx)
+{
+	struct clk_init_data init;
+	struct clk_psc *psc;
+	struct clk *clk;
+
+	psc = kzalloc(sizeof(*psc), GFP_KERNEL);
+	if (!psc)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &clk_ddiv_ops;
+	init.flags = 0;
+	init.parent_names = mux_parents;
+	init.num_parents = ARRAY_SIZE(mux_parents);
+
+	psc->reg = reg;
+	psc->bit_idx = bit_idx;
+	psc->lock = &clk_lock;
+	psc->hw.init = &init;
+
+	clk = clk_register(NULL, &psc->hw);
+	if (IS_ERR(clk)) {
+		kfree(psc);
+		return ERR_CAST(clk);
+	}
+	return &psc->hw;
+}
+
+static unsigned long ep93xx_div_recalc_rate(struct clk_hw *hw,
+					    unsigned long parent_rate)
+{
+	struct clk_psc *psc = to_clk_psc(hw);
+	u32 val = __raw_readl(psc->reg);
+	u8 index = (val & psc->mask) >> psc->shift;
+
+	if (index > psc->num_div)
+		return 0;
+
+	return DIV_ROUND_UP_ULL(parent_rate, psc->div[index]);
+}
+
+static long ep93xx_div_round_rate(struct clk_hw *hw, unsigned long rate,
+				   unsigned long *parent_rate)
+{
+	struct clk_psc *psc = to_clk_psc(hw);
+	unsigned long best = 0, now, maxdiv;
+	int i;
+
+	maxdiv = psc->div[psc->num_div - 1];
+
+	for (i = 0; i < psc->num_div; i++) {
+		if ((rate * psc->div[i]) == *parent_rate)
+			return DIV_ROUND_UP_ULL((u64)*parent_rate, psc->div[i]);
+
+		now = DIV_ROUND_UP_ULL((u64)*parent_rate, psc->div[i]);
+
+		if (is_best(rate, now, best))
+			best = now;
+	}
+
+	if (!best)
+		best = DIV_ROUND_UP_ULL(*parent_rate, maxdiv);
+
+	return best;
+}
+
+static int ep93xx_div_set_rate(struct clk_hw *hw, unsigned long rate,
+			       unsigned long parent_rate)
+{
+	struct clk_psc *psc = to_clk_psc(hw);
+	u32 val = __raw_readl(psc->reg) & ~psc->mask;
+	int i;
+
+	for (i = 0; i < psc->num_div; i++)
+		if (rate == parent_rate / psc->div[i]) {
+			val |= i << psc->shift;
+			break;
+		}
+
+	if (i == psc->num_div)
+		return -EINVAL;
+
+	ep93xx_syscon_swlocked_write(val, psc->reg);
+
+	return 0;
+}
+
+static const struct clk_ops ep93xx_div_ops = {
+	.enable = ep93xx_clk_enable,
+	.disable = ep93xx_clk_disable,
+	.is_enabled = ep93xx_clk_is_enabled,
+	.recalc_rate = ep93xx_div_recalc_rate,
+	.round_rate = ep93xx_div_round_rate,
+	.set_rate = ep93xx_div_set_rate,
+};
+
+static struct clk_hw *clk_hw_register_div(const char *name,
+					  const char *parent_name,
+					  void __iomem *reg,
+					  u8 enable_bit,
+					  u8 shift,
+					  u8 width,
+					  char *clk_divisors,
+					  u8 num_div)
+{
+	struct clk_init_data init;
+	struct clk_psc *psc;
+	struct clk *clk;
+
+	psc = kzalloc(sizeof(*psc), GFP_KERNEL);
+	if (!psc)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &ep93xx_div_ops;
+	init.flags = 0;
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = 1;
+
+	psc->reg = reg;
+	psc->bit_idx = enable_bit;
+	psc->mask = GENMASK(shift + width - 1, shift);
+	psc->shift = shift;
+	psc->div = clk_divisors;
+	psc->num_div = num_div;
+	psc->lock = &clk_lock;
+	psc->hw.init = &init;
+
+	clk = clk_register(NULL, &psc->hw);
+	if (IS_ERR(clk)) {
+		kfree(psc);
+		return ERR_CAST(clk);
+	}
+	return &psc->hw;
+}
+
+struct ep93xx_gate {
+	unsigned int bit;
+	const char *dev_id;
+	const char *con_id;
+};
+
+static struct ep93xx_gate ep93xx_uarts[] = {
+	{EP93XX_SYSCON_DEVCFG_U1EN, "apb:uart1", NULL},
+	{EP93XX_SYSCON_DEVCFG_U2EN, "apb:uart2", NULL},
+	{EP93XX_SYSCON_DEVCFG_U3EN, "apb:uart3", NULL},
+};
+
+static void __init ep93xx_uart_clock_init(void)
+{
+	unsigned int i;
+	struct clk_hw *hw;
+	u32 value;
+	unsigned int clk_uart_div;
+
+	value = __raw_readl(EP93XX_SYSCON_PWRCNT);
+	if (value & EP93XX_SYSCON_PWRCNT_UARTBAUD)
+		clk_uart_div = 1;
+	else
+		clk_uart_div = 2;
+
+	hw = clk_hw_register_fixed_factor(NULL, "uart", "xtali", 0, 1, clk_uart_div);
+
+	/* parenting uart gate clocks to uart clock */
+	for (i = 0; i < ARRAY_SIZE(ep93xx_uarts); i++) {
+		hw = ep93xx_clk_register_gate(ep93xx_uarts[i].dev_id,
+					"uart",
+					EP93XX_SYSCON_DEVCFG,
+					ep93xx_uarts[i].bit);
+
+		clk_hw_register_clkdev(hw, NULL, ep93xx_uarts[i].dev_id);
+	}
+}
+
+static struct ep93xx_gate ep93xx_dmas[] = {
+	{EP93XX_SYSCON_PWRCNT_DMA_M2P0, NULL, "m2p0"},
+	{EP93XX_SYSCON_PWRCNT_DMA_M2P1, NULL, "m2p1"},
+	{EP93XX_SYSCON_PWRCNT_DMA_M2P2, NULL, "m2p2"},
+	{EP93XX_SYSCON_PWRCNT_DMA_M2P3, NULL, "m2p3"},
+	{EP93XX_SYSCON_PWRCNT_DMA_M2P4, NULL, "m2p4"},
+	{EP93XX_SYSCON_PWRCNT_DMA_M2P5, NULL, "m2p5"},
+	{EP93XX_SYSCON_PWRCNT_DMA_M2P6, NULL, "m2p6"},
+	{EP93XX_SYSCON_PWRCNT_DMA_M2P7, NULL, "m2p7"},
+	{EP93XX_SYSCON_PWRCNT_DMA_M2P8, NULL, "m2p8"},
+	{EP93XX_SYSCON_PWRCNT_DMA_M2P9, NULL, "m2p9"},
+	{EP93XX_SYSCON_PWRCNT_DMA_M2M0, NULL, "m2m0"},
+	{EP93XX_SYSCON_PWRCNT_DMA_M2M1, NULL, "m2m1"},
+};
+
+static void __init ep93xx_dma_clock_init(void)
+{
+	unsigned int i;
+	struct clk_hw *hw;
+	int ret;
+
+	for (i = 0; i < ARRAY_SIZE(ep93xx_dmas); i++) {
+		hw = clk_hw_register_gate(NULL, ep93xx_dmas[i].con_id,
+					"hclk", 0,
+					EP93XX_SYSCON_PWRCNT,
+					ep93xx_dmas[i].bit,
+					0,
+					&clk_lock);
+
+		ret = clk_hw_register_clkdev(hw, ep93xx_dmas[i].con_id, NULL);
+		if (ret)
+			pr_err("%s: failed to register lookup %s\n",
+			       __func__, ep93xx_dmas[i].con_id);
+	}
+}
+
+static int __init ep93xx_clock_init(void)
+{
+	u32 value;
+	struct clk_hw *hw;
+	unsigned long clk_pll1_rate;
+	unsigned long clk_f_rate;
+	unsigned long clk_h_rate;
+	unsigned long clk_p_rate;
+	unsigned long clk_pll2_rate;
+	unsigned int clk_f_div;
+	unsigned int clk_h_div;
+	unsigned int clk_p_div;
+	unsigned int clk_usb_div;
+	unsigned long clk_spi_div;
+
+	hw = clk_hw_register_fixed_rate(NULL, "xtali", NULL, 0, EP93XX_EXT_CLK_RATE);
+	clk_hw_register_clkdev(hw, NULL, "xtali");
+
+	/* Determine the bootloader configured pll1 rate */
+	value = __raw_readl(EP93XX_SYSCON_CLKSET1);
+	if (!(value & EP93XX_SYSCON_CLKSET1_NBYP1))
+		clk_pll1_rate = EP93XX_EXT_CLK_RATE;
+	else
+		clk_pll1_rate = calc_pll_rate(EP93XX_EXT_CLK_RATE, value);
+
+	hw = clk_hw_register_fixed_rate(NULL, "pll1", "xtali", 0, clk_pll1_rate);
+	clk_hw_register_clkdev(hw, NULL, "pll1");
+
+	/* Initialize the pll1 derived clocks */
+	clk_f_div = fclk_divisors[(value >> 25) & 0x7];
+	clk_h_div = hclk_divisors[(value >> 20) & 0x7];
+	clk_p_div = pclk_divisors[(value >> 18) & 0x3];
+
+	hw = clk_hw_register_fixed_factor(NULL, "fclk", "pll1", 0, 1, clk_f_div);
+	clk_f_rate = clk_get_rate(hw->clk);
+	hw = clk_hw_register_fixed_factor(NULL, "hclk", "pll1", 0, 1, clk_h_div);
+	clk_h_rate = clk_get_rate(hw->clk);
+	hw = clk_hw_register_fixed_factor(NULL, "pclk", "hclk", 0, 1, clk_p_div);
+	clk_p_rate = clk_get_rate(hw->clk);
+
+	clk_hw_register_clkdev(hw, "apb_pclk", NULL);
+
+	ep93xx_dma_clock_init();
+
+	/* Determine the bootloader configured pll2 rate */
+	value = __raw_readl(EP93XX_SYSCON_CLKSET2);
+	if (!(value & EP93XX_SYSCON_CLKSET2_NBYP2))
+		clk_pll2_rate = EP93XX_EXT_CLK_RATE;
+	else if (value & EP93XX_SYSCON_CLKSET2_PLL2_EN)
+		clk_pll2_rate = calc_pll_rate(EP93XX_EXT_CLK_RATE, value);
+	else
+		clk_pll2_rate = 0;
+
+	hw = clk_hw_register_fixed_rate(NULL, "pll2", "xtali", 0, clk_pll2_rate);
+	clk_hw_register_clkdev(hw, NULL, "pll2");
+
+	/* Initialize the pll2 derived clocks */
+	/*
+	 * These four bits set the divide ratio between the PLL2
+	 * output and the USB clock.
+	 * 0000 - Divide by 1
+	 * 0001 - Divide by 2
+	 * 0010 - Divide by 3
+	 * 0011 - Divide by 4
+	 * 0100 - Divide by 5
+	 * 0101 - Divide by 6
+	 * 0110 - Divide by 7
+	 * 0111 - Divide by 8
+	 * 1000 - Divide by 9
+	 * 1001 - Divide by 10
+	 * 1010 - Divide by 11
+	 * 1011 - Divide by 12
+	 * 1100 - Divide by 13
+	 * 1101 - Divide by 14
+	 * 1110 - Divide by 15
+	 * 1111 - Divide by 1
+	 * On power-on-reset these bits are reset to 0000b.
+	 */
+	clk_usb_div = (((value >> 28) & 0xf) + 1);
+	hw = clk_hw_register_fixed_factor(NULL, "usb_clk", "pll2", 0, 1, clk_usb_div);
+	hw = clk_hw_register_gate(NULL, "ohci-platform",
+				"usb_clk", 0,
+				EP93XX_SYSCON_PWRCNT,
+				EP93XX_SYSCON_PWRCNT_USH_EN,
+				0,
+				&clk_lock);
+	clk_hw_register_clkdev(hw, NULL, "ohci-platform");
+
+	/*
+	 * EP93xx SSP clock rate was doubled in version E2. For more information
+	 * see:
+	 *     http://www.cirrus.com/en/pubs/appNote/AN273REV4.pdf
+	 */
+	clk_spi_div = 1;
+	if (ep93xx_chip_revision() < EP93XX_CHIP_REV_E2)
+		clk_spi_div = 2;
+	hw = clk_hw_register_fixed_factor(NULL, "ep93xx-spi.0", "xtali", 0, 1, clk_spi_div);
+	clk_hw_register_clkdev(hw, NULL, "ep93xx-spi.0");
+
+	/* pwm clock */
+	hw = clk_hw_register_fixed_factor(NULL, "pwm_clk", "xtali", 0, 1, 1);
+	clk_hw_register_clkdev(hw, "pwm_clk", NULL);
+
+	pr_info("PLL1 running at %ld MHz, PLL2 at %ld MHz\n",
+		clk_pll1_rate / 1000000, clk_pll2_rate / 1000000);
+	pr_info("FCLK %ld MHz, HCLK %ld MHz, PCLK %ld MHz\n",
+		clk_f_rate / 1000000, clk_h_rate / 1000000,
+		clk_p_rate / 1000000);
+
+	ep93xx_uart_clock_init();
+
+	/* touchscreen/adc clock */
+	hw = clk_hw_register_div("ep93xx-adc",
+				"xtali",
+				EP93XX_SYSCON_KEYTCHCLKDIV,
+				EP93XX_SYSCON_KEYTCHCLKDIV_TSEN,
+				EP93XX_SYSCON_KEYTCHCLKDIV_ADIV,
+				1,
+				adc_divisors,
+				ARRAY_SIZE(adc_divisors));
+
+	clk_hw_register_clkdev(hw, NULL, "ep93xx-adc");
+
+	/* keypad clock */
+	hw = clk_hw_register_div("ep93xx-keypad",
+				"xtali",
+				EP93XX_SYSCON_KEYTCHCLKDIV,
+				EP93XX_SYSCON_KEYTCHCLKDIV_KEN,
+				EP93XX_SYSCON_KEYTCHCLKDIV_KDIV,
+				1,
+				adc_divisors,
+				ARRAY_SIZE(adc_divisors));
+
+	clk_hw_register_clkdev(hw, NULL, "ep93xx-keypad");
+
+	/* On reset PDIV and VDIV is set to zero, while PDIV zero
+	 * means clock disable, VDIV shouldn't be zero.
+	 * So i set both dividers to minimum.
+	 */
+	/* ENA - Enable CLK divider. */
+	/* PDIV - 00 - Disable clock */
+	/* VDIV - at least 2 */
+	/* Check and enable video clk registers */
+	value = __raw_readl(EP93XX_SYSCON_VIDCLKDIV);
+	value |= (1 << EP93XX_SYSCON_CLKDIV_PDIV_SHIFT) | 2;
+	ep93xx_syscon_swlocked_write(value, EP93XX_SYSCON_VIDCLKDIV);
+
+	/* check and enable i2s clk registers */
+	value = __raw_readl(EP93XX_SYSCON_I2SCLKDIV);
+	value |= (1 << EP93XX_SYSCON_CLKDIV_PDIV_SHIFT) | 2;
+	ep93xx_syscon_swlocked_write(value, EP93XX_SYSCON_I2SCLKDIV);
+
+	/* video clk */
+	hw = clk_hw_register_ddiv("ep93xx-fb",
+				EP93XX_SYSCON_VIDCLKDIV,
+				EP93XX_SYSCON_CLKDIV_ENABLE);
+
+	clk_hw_register_clkdev(hw, NULL, "ep93xx-fb");
+
+	/* i2s clk */
+	hw = clk_hw_register_ddiv("mclk",
+				EP93XX_SYSCON_I2SCLKDIV,
+				EP93XX_SYSCON_CLKDIV_ENABLE);
+
+	clk_hw_register_clkdev(hw, "mclk", "ep93xx-i2s");
+
+	/* i2s sclk */
+#define EP93XX_I2SCLKDIV_SDIV_SHIFT	16
+#define EP93XX_I2SCLKDIV_SDIV_WIDTH	1
+	hw = clk_hw_register_div("sclk",
+				"mclk",
+				EP93XX_SYSCON_I2SCLKDIV,
+				EP93XX_SYSCON_I2SCLKDIV_SENA,
+				EP93XX_I2SCLKDIV_SDIV_SHIFT,
+				EP93XX_I2SCLKDIV_SDIV_WIDTH,
+				sclk_divisors,
+				ARRAY_SIZE(sclk_divisors));
+
+	clk_hw_register_clkdev(hw, "sclk", "ep93xx-i2s");
+
+	/* i2s lrclk */
+#define EP93XX_I2SCLKDIV_LRDIV32_SHIFT	17
+#define EP93XX_I2SCLKDIV_LRDIV32_WIDTH	3
+	hw = clk_hw_register_div("lrclk",
+				"sclk",
+				EP93XX_SYSCON_I2SCLKDIV,
+				EP93XX_SYSCON_I2SCLKDIV_SENA,
+				EP93XX_I2SCLKDIV_LRDIV32_SHIFT,
+				EP93XX_I2SCLKDIV_LRDIV32_WIDTH,
+				lrclk_divisors,
+				ARRAY_SIZE(lrclk_divisors));
+
+	clk_hw_register_clkdev(hw, "lrclk", "ep93xx-i2s");
+
+	return 0;
+}
+postcore_initcall(ep93xx_clock_init);