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path: root/drivers/clk/imx/clk-pllv3.c
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-rw-r--r--drivers/clk/imx/clk-pllv3.c488
1 files changed, 488 insertions, 0 deletions
diff --git a/drivers/clk/imx/clk-pllv3.c b/drivers/clk/imx/clk-pllv3.c
new file mode 100644
index 000000000..eea32f87c
--- /dev/null
+++ b/drivers/clk/imx/clk-pllv3.c
@@ -0,0 +1,488 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ * Copyright 2012 Linaro Ltd.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/err.h>
+#include "clk.h"
+
+#define PLL_NUM_OFFSET 0x10
+#define PLL_DENOM_OFFSET 0x20
+#define PLL_IMX7_NUM_OFFSET 0x20
+#define PLL_IMX7_DENOM_OFFSET 0x30
+
+#define PLL_VF610_NUM_OFFSET 0x20
+#define PLL_VF610_DENOM_OFFSET 0x30
+
+#define BM_PLL_POWER (0x1 << 12)
+#define BM_PLL_LOCK (0x1 << 31)
+#define IMX7_ENET_PLL_POWER (0x1 << 5)
+#define IMX7_DDR_PLL_POWER (0x1 << 20)
+
+#define PLL_LOCK_TIMEOUT 10000
+
+/**
+ * struct clk_pllv3 - IMX PLL clock version 3
+ * @hw: clock source
+ * @base: base address of PLL registers
+ * @power_bit: pll power bit mask
+ * @powerup_set: set power_bit to power up the PLL
+ * @div_mask: mask of divider bits
+ * @div_shift: shift of divider bits
+ * @ref_clock: reference clock rate
+ * @num_offset: num register offset
+ * @denom_offset: denom register offset
+ *
+ * IMX PLL clock version 3, found on i.MX6 series. Divider for pllv3
+ * is actually a multiplier, and always sits at bit 0.
+ */
+struct clk_pllv3 {
+ struct clk_hw hw;
+ void __iomem *base;
+ u32 power_bit;
+ bool powerup_set;
+ u32 div_mask;
+ u32 div_shift;
+ unsigned long ref_clock;
+ u32 num_offset;
+ u32 denom_offset;
+};
+
+#define to_clk_pllv3(_hw) container_of(_hw, struct clk_pllv3, hw)
+
+static int clk_pllv3_wait_lock(struct clk_pllv3 *pll)
+{
+ u32 val = readl_relaxed(pll->base) & pll->power_bit;
+
+ /* No need to wait for lock when pll is not powered up */
+ if ((pll->powerup_set && !val) || (!pll->powerup_set && val))
+ return 0;
+
+ return readl_relaxed_poll_timeout(pll->base, val, val & BM_PLL_LOCK,
+ 500, PLL_LOCK_TIMEOUT);
+}
+
+static int clk_pllv3_prepare(struct clk_hw *hw)
+{
+ struct clk_pllv3 *pll = to_clk_pllv3(hw);
+ u32 val;
+
+ val = readl_relaxed(pll->base);
+ if (pll->powerup_set)
+ val |= pll->power_bit;
+ else
+ val &= ~pll->power_bit;
+ writel_relaxed(val, pll->base);
+
+ return clk_pllv3_wait_lock(pll);
+}
+
+static void clk_pllv3_unprepare(struct clk_hw *hw)
+{
+ struct clk_pllv3 *pll = to_clk_pllv3(hw);
+ u32 val;
+
+ val = readl_relaxed(pll->base);
+ if (pll->powerup_set)
+ val &= ~pll->power_bit;
+ else
+ val |= pll->power_bit;
+ writel_relaxed(val, pll->base);
+}
+
+static int clk_pllv3_is_prepared(struct clk_hw *hw)
+{
+ struct clk_pllv3 *pll = to_clk_pllv3(hw);
+
+ if (readl_relaxed(pll->base) & BM_PLL_LOCK)
+ return 1;
+
+ return 0;
+}
+
+static unsigned long clk_pllv3_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_pllv3 *pll = to_clk_pllv3(hw);
+ u32 div = (readl_relaxed(pll->base) >> pll->div_shift) & pll->div_mask;
+
+ return (div == 1) ? parent_rate * 22 : parent_rate * 20;
+}
+
+static long clk_pllv3_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ unsigned long parent_rate = *prate;
+
+ return (rate >= parent_rate * 22) ? parent_rate * 22 :
+ parent_rate * 20;
+}
+
+static int clk_pllv3_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_pllv3 *pll = to_clk_pllv3(hw);
+ u32 val, div;
+
+ if (rate == parent_rate * 22)
+ div = 1;
+ else if (rate == parent_rate * 20)
+ div = 0;
+ else
+ return -EINVAL;
+
+ val = readl_relaxed(pll->base);
+ val &= ~(pll->div_mask << pll->div_shift);
+ val |= (div << pll->div_shift);
+ writel_relaxed(val, pll->base);
+
+ return clk_pllv3_wait_lock(pll);
+}
+
+static const struct clk_ops clk_pllv3_ops = {
+ .prepare = clk_pllv3_prepare,
+ .unprepare = clk_pllv3_unprepare,
+ .is_prepared = clk_pllv3_is_prepared,
+ .recalc_rate = clk_pllv3_recalc_rate,
+ .round_rate = clk_pllv3_round_rate,
+ .set_rate = clk_pllv3_set_rate,
+};
+
+static unsigned long clk_pllv3_sys_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_pllv3 *pll = to_clk_pllv3(hw);
+ u32 div = readl_relaxed(pll->base) & pll->div_mask;
+
+ return parent_rate * div / 2;
+}
+
+static long clk_pllv3_sys_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ unsigned long parent_rate = *prate;
+ unsigned long min_rate = parent_rate * 54 / 2;
+ unsigned long max_rate = parent_rate * 108 / 2;
+ u32 div;
+
+ if (rate > max_rate)
+ rate = max_rate;
+ else if (rate < min_rate)
+ rate = min_rate;
+ div = rate * 2 / parent_rate;
+
+ return parent_rate * div / 2;
+}
+
+static int clk_pllv3_sys_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_pllv3 *pll = to_clk_pllv3(hw);
+ unsigned long min_rate = parent_rate * 54 / 2;
+ unsigned long max_rate = parent_rate * 108 / 2;
+ u32 val, div;
+
+ if (rate < min_rate || rate > max_rate)
+ return -EINVAL;
+
+ div = rate * 2 / parent_rate;
+ val = readl_relaxed(pll->base);
+ val &= ~pll->div_mask;
+ val |= div;
+ writel_relaxed(val, pll->base);
+
+ return clk_pllv3_wait_lock(pll);
+}
+
+static const struct clk_ops clk_pllv3_sys_ops = {
+ .prepare = clk_pllv3_prepare,
+ .unprepare = clk_pllv3_unprepare,
+ .is_prepared = clk_pllv3_is_prepared,
+ .recalc_rate = clk_pllv3_sys_recalc_rate,
+ .round_rate = clk_pllv3_sys_round_rate,
+ .set_rate = clk_pllv3_sys_set_rate,
+};
+
+static unsigned long clk_pllv3_av_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_pllv3 *pll = to_clk_pllv3(hw);
+ u32 mfn = readl_relaxed(pll->base + pll->num_offset);
+ u32 mfd = readl_relaxed(pll->base + pll->denom_offset);
+ u32 div = readl_relaxed(pll->base) & pll->div_mask;
+ u64 temp64 = (u64)parent_rate;
+
+ temp64 *= mfn;
+ do_div(temp64, mfd);
+
+ return parent_rate * div + (unsigned long)temp64;
+}
+
+static long clk_pllv3_av_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ unsigned long parent_rate = *prate;
+ unsigned long min_rate = parent_rate * 27;
+ unsigned long max_rate = parent_rate * 54;
+ u32 div;
+ u32 mfn, mfd = 1000000;
+ u32 max_mfd = 0x3FFFFFFF;
+ u64 temp64;
+
+ if (rate > max_rate)
+ rate = max_rate;
+ else if (rate < min_rate)
+ rate = min_rate;
+
+ if (parent_rate <= max_mfd)
+ mfd = parent_rate;
+
+ div = rate / parent_rate;
+ temp64 = (u64) (rate - div * parent_rate);
+ temp64 *= mfd;
+ temp64 = div64_ul(temp64, parent_rate);
+ mfn = temp64;
+
+ temp64 = (u64)parent_rate;
+ temp64 *= mfn;
+ do_div(temp64, mfd);
+
+ return parent_rate * div + (unsigned long)temp64;
+}
+
+static int clk_pllv3_av_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_pllv3 *pll = to_clk_pllv3(hw);
+ unsigned long min_rate = parent_rate * 27;
+ unsigned long max_rate = parent_rate * 54;
+ u32 val, div;
+ u32 mfn, mfd = 1000000;
+ u32 max_mfd = 0x3FFFFFFF;
+ u64 temp64;
+
+ if (rate < min_rate || rate > max_rate)
+ return -EINVAL;
+
+ if (parent_rate <= max_mfd)
+ mfd = parent_rate;
+
+ div = rate / parent_rate;
+ temp64 = (u64) (rate - div * parent_rate);
+ temp64 *= mfd;
+ temp64 = div64_ul(temp64, parent_rate);
+ mfn = temp64;
+
+ val = readl_relaxed(pll->base);
+ val &= ~pll->div_mask;
+ val |= div;
+ writel_relaxed(val, pll->base);
+ writel_relaxed(mfn, pll->base + pll->num_offset);
+ writel_relaxed(mfd, pll->base + pll->denom_offset);
+
+ return clk_pllv3_wait_lock(pll);
+}
+
+static const struct clk_ops clk_pllv3_av_ops = {
+ .prepare = clk_pllv3_prepare,
+ .unprepare = clk_pllv3_unprepare,
+ .is_prepared = clk_pllv3_is_prepared,
+ .recalc_rate = clk_pllv3_av_recalc_rate,
+ .round_rate = clk_pllv3_av_round_rate,
+ .set_rate = clk_pllv3_av_set_rate,
+};
+
+struct clk_pllv3_vf610_mf {
+ u32 mfi; /* integer part, can be 20 or 22 */
+ u32 mfn; /* numerator, 30-bit value */
+ u32 mfd; /* denominator, 30-bit value, must be less than mfn */
+};
+
+static unsigned long clk_pllv3_vf610_mf_to_rate(unsigned long parent_rate,
+ struct clk_pllv3_vf610_mf mf)
+{
+ u64 temp64;
+
+ temp64 = parent_rate;
+ temp64 *= mf.mfn;
+ do_div(temp64, mf.mfd);
+
+ return (parent_rate * mf.mfi) + temp64;
+}
+
+static struct clk_pllv3_vf610_mf clk_pllv3_vf610_rate_to_mf(
+ unsigned long parent_rate, unsigned long rate)
+{
+ struct clk_pllv3_vf610_mf mf;
+ u64 temp64;
+
+ mf.mfi = (rate >= 22 * parent_rate) ? 22 : 20;
+ mf.mfd = 0x3fffffff; /* use max supported value for best accuracy */
+
+ if (rate <= parent_rate * mf.mfi)
+ mf.mfn = 0;
+ else if (rate >= parent_rate * (mf.mfi + 1))
+ mf.mfn = mf.mfd - 1;
+ else {
+ /* rate = parent_rate * (mfi + mfn/mfd) */
+ temp64 = rate - parent_rate * mf.mfi;
+ temp64 *= mf.mfd;
+ temp64 = div64_ul(temp64, parent_rate);
+ mf.mfn = temp64;
+ }
+
+ return mf;
+}
+
+static unsigned long clk_pllv3_vf610_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_pllv3 *pll = to_clk_pllv3(hw);
+ struct clk_pllv3_vf610_mf mf;
+
+ mf.mfn = readl_relaxed(pll->base + pll->num_offset);
+ mf.mfd = readl_relaxed(pll->base + pll->denom_offset);
+ mf.mfi = (readl_relaxed(pll->base) & pll->div_mask) ? 22 : 20;
+
+ return clk_pllv3_vf610_mf_to_rate(parent_rate, mf);
+}
+
+static long clk_pllv3_vf610_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct clk_pllv3_vf610_mf mf = clk_pllv3_vf610_rate_to_mf(*prate, rate);
+
+ return clk_pllv3_vf610_mf_to_rate(*prate, mf);
+}
+
+static int clk_pllv3_vf610_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_pllv3 *pll = to_clk_pllv3(hw);
+ struct clk_pllv3_vf610_mf mf =
+ clk_pllv3_vf610_rate_to_mf(parent_rate, rate);
+ u32 val;
+
+ val = readl_relaxed(pll->base);
+ if (mf.mfi == 20)
+ val &= ~pll->div_mask; /* clear bit for mfi=20 */
+ else
+ val |= pll->div_mask; /* set bit for mfi=22 */
+ writel_relaxed(val, pll->base);
+
+ writel_relaxed(mf.mfn, pll->base + pll->num_offset);
+ writel_relaxed(mf.mfd, pll->base + pll->denom_offset);
+
+ return clk_pllv3_wait_lock(pll);
+}
+
+static const struct clk_ops clk_pllv3_vf610_ops = {
+ .prepare = clk_pllv3_prepare,
+ .unprepare = clk_pllv3_unprepare,
+ .is_prepared = clk_pllv3_is_prepared,
+ .recalc_rate = clk_pllv3_vf610_recalc_rate,
+ .round_rate = clk_pllv3_vf610_round_rate,
+ .set_rate = clk_pllv3_vf610_set_rate,
+};
+
+static unsigned long clk_pllv3_enet_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_pllv3 *pll = to_clk_pllv3(hw);
+
+ return pll->ref_clock;
+}
+
+static const struct clk_ops clk_pllv3_enet_ops = {
+ .prepare = clk_pllv3_prepare,
+ .unprepare = clk_pllv3_unprepare,
+ .is_prepared = clk_pllv3_is_prepared,
+ .recalc_rate = clk_pllv3_enet_recalc_rate,
+};
+
+struct clk_hw *imx_clk_hw_pllv3(enum imx_pllv3_type type, const char *name,
+ const char *parent_name, void __iomem *base,
+ u32 div_mask)
+{
+ struct clk_pllv3 *pll;
+ const struct clk_ops *ops;
+ struct clk_hw *hw;
+ struct clk_init_data init;
+ int ret;
+
+ pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+ if (!pll)
+ return ERR_PTR(-ENOMEM);
+
+ pll->power_bit = BM_PLL_POWER;
+ pll->num_offset = PLL_NUM_OFFSET;
+ pll->denom_offset = PLL_DENOM_OFFSET;
+
+ switch (type) {
+ case IMX_PLLV3_SYS:
+ ops = &clk_pllv3_sys_ops;
+ break;
+ case IMX_PLLV3_SYS_VF610:
+ ops = &clk_pllv3_vf610_ops;
+ pll->num_offset = PLL_VF610_NUM_OFFSET;
+ pll->denom_offset = PLL_VF610_DENOM_OFFSET;
+ break;
+ case IMX_PLLV3_USB_VF610:
+ pll->div_shift = 1;
+ fallthrough;
+ case IMX_PLLV3_USB:
+ ops = &clk_pllv3_ops;
+ pll->powerup_set = true;
+ break;
+ case IMX_PLLV3_AV_IMX7:
+ pll->num_offset = PLL_IMX7_NUM_OFFSET;
+ pll->denom_offset = PLL_IMX7_DENOM_OFFSET;
+ fallthrough;
+ case IMX_PLLV3_AV:
+ ops = &clk_pllv3_av_ops;
+ break;
+ case IMX_PLLV3_ENET_IMX7:
+ pll->power_bit = IMX7_ENET_PLL_POWER;
+ pll->ref_clock = 1000000000;
+ ops = &clk_pllv3_enet_ops;
+ break;
+ case IMX_PLLV3_ENET:
+ pll->ref_clock = 500000000;
+ ops = &clk_pllv3_enet_ops;
+ break;
+ case IMX_PLLV3_DDR_IMX7:
+ pll->power_bit = IMX7_DDR_PLL_POWER;
+ pll->num_offset = PLL_IMX7_NUM_OFFSET;
+ pll->denom_offset = PLL_IMX7_DENOM_OFFSET;
+ ops = &clk_pllv3_av_ops;
+ break;
+ default:
+ ops = &clk_pllv3_ops;
+ }
+ pll->base = base;
+ pll->div_mask = div_mask;
+
+ init.name = name;
+ init.ops = ops;
+ init.flags = 0;
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+
+ pll->hw.init = &init;
+ hw = &pll->hw;
+
+ ret = clk_hw_register(NULL, hw);
+ if (ret) {
+ kfree(pll);
+ return ERR_PTR(ret);
+ }
+
+ return hw;
+}