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Subject[PATCH v0 04/15] drivers: clk: st: Support for QUADFS inside ClockGenB/C/D/E/F
Date
The patch supports the 216/432/660 type Quad Frequency Synthesizers
used by ClockGenB/C/D/E/F

QUADFS clock : It includes support for all 216/432/660 type Quad
Frequency Synthesizers : implemented as Fixed Parent / Rate / Gate clock,
with clock rate calculated reading H/w settings done at BOOT.

QuadFS have 4 outputs : chan0 chan1 chan2 chan3

Signed-off-by: Pankaj Dev <pankaj.dev@st.com>
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com>
---
drivers/clk/st/Makefile | 2 +-
drivers/clk/st/clkgen-fsyn.c | 1039 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 1040 insertions(+), 1 deletion(-)
create mode 100644 drivers/clk/st/clkgen-fsyn.c

diff --git a/drivers/clk/st/Makefile b/drivers/clk/st/Makefile
index b7b10f9..c7455ff 100644
--- a/drivers/clk/st/Makefile
+++ b/drivers/clk/st/Makefile
@@ -1 +1 @@
-obj-y += clkgen-mux.o clkgen-pll.o
+obj-y += clkgen-mux.o clkgen-pll.o clkgen-fsyn.o
diff --git a/drivers/clk/st/clkgen-fsyn.c b/drivers/clk/st/clkgen-fsyn.c
new file mode 100644
index 0000000..4f53ee0
--- /dev/null
+++ b/drivers/clk/st/clkgen-fsyn.c
@@ -0,0 +1,1039 @@
+/*
+ * Copyright (C) 2014 STMicroelectronics R&D Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+/*
+ * Authors:
+ * Stephen Gallimore <stephen.gallimore@st.com>,
+ * Pankaj Dev <pankaj.dev@st.com>.
+ */
+
+#include <linux/slab.h>
+#include <linux/of_address.h>
+#include <linux/clk-provider.h>
+
+#include "clkgen.h"
+
+/*
+ * Maximum input clock to the PLL before we divide it down by 2
+ * although in reality in actual systems this has never been seen to
+ * be used.
+ */
+#define QUADFS_NDIV_THRESHOLD 30000000
+
+#define PLL_BW_GOODREF (0L)
+#define PLL_BW_VBADREF (1L)
+#define PLL_BW_BADREF (2L)
+#define PLL_BW_VGOODREF (3L)
+
+#define QUADFS_MAX_CHAN 4
+
+struct stm_fs {
+ unsigned long ndiv;
+ unsigned long mdiv;
+ unsigned long pe;
+ unsigned long sdiv;
+ unsigned long nsdiv;
+};
+
+static struct stm_fs fs216c65_rtbl[] = {
+ { .mdiv = 0x1f, .pe = 0x0, .sdiv = 0x7, .nsdiv = 0 }, /* 312.5 Khz */
+ { .mdiv = 0x17, .pe = 0x25ed, .sdiv = 0x1, .nsdiv = 0 }, /* 27 MHz */
+ { .mdiv = 0x1a, .pe = 0x7b36, .sdiv = 0x2, .nsdiv = 1 }, /* 36.87 MHz */
+ { .mdiv = 0x13, .pe = 0x0, .sdiv = 0x2, .nsdiv = 1 }, /* 48 MHz */
+ { .mdiv = 0x11, .pe = 0x1c72, .sdiv = 0x1, .nsdiv = 1 }, /* 108 MHz */
+};
+
+static struct stm_fs fs432c65_rtbl[] = {
+ { .mdiv = 0x1f, .pe = 0x0, .sdiv = 0x7, .nsdiv = 0 }, /* 625 Khz */
+ { .mdiv = 0x11, .pe = 0x1c72, .sdiv = 0x2, .nsdiv = 1 }, /* 108 MHz */
+ { .mdiv = 0x19, .pe = 0x121a, .sdiv = 0x0, .nsdiv = 1 }, /* 297 MHz */
+};
+
+static struct stm_fs fs660c32_rtbl[] = {
+ { .mdiv = 0x01, .pe = 0x2aaa, .sdiv = 0x8, .nsdiv = 0 }, /* 600 KHz */
+ { .mdiv = 0x02, .pe = 0x3d33, .sdiv = 0x0, .nsdiv = 0 }, /* 148.5 Mhz */
+ { .mdiv = 0x13, .pe = 0x5bcc, .sdiv = 0x0, .nsdiv = 1 }, /* 297 Mhz */
+ { .mdiv = 0x0e, .pe = 0x1025, .sdiv = 0x0, .nsdiv = 1 }, /* 333 Mhz */
+ { .mdiv = 0x0b, .pe = 0x715f, .sdiv = 0x0, .nsdiv = 1 }, /* 350 Mhz */
+};
+
+struct clkgen_quadfs_data {
+ bool reset_present;
+ bool bwfilter_present;
+ bool lockstatus_present;
+ bool nsdiv_present;
+ struct clkgen_field ndiv;
+ struct clkgen_field ref_bw;
+ struct clkgen_field nreset;
+ struct clkgen_field npda;
+ struct clkgen_field lock_status;
+
+ struct clkgen_field nsb[QUADFS_MAX_CHAN];
+ struct clkgen_field en[QUADFS_MAX_CHAN];
+ struct clkgen_field mdiv[QUADFS_MAX_CHAN];
+ struct clkgen_field pe[QUADFS_MAX_CHAN];
+ struct clkgen_field sdiv[QUADFS_MAX_CHAN];
+ struct clkgen_field nsdiv[QUADFS_MAX_CHAN];
+
+ const struct clk_ops *pll_ops;
+ struct stm_fs *rtbl;
+ u8 rtbl_cnt;
+ int (*get_rate)(unsigned long , struct stm_fs *,
+ unsigned long *);
+};
+
+static const struct clk_ops st_quadfs_pll_c65_ops;
+static const struct clk_ops st_quadfs_pll_c32_ops;
+static const struct clk_ops st_quadfs_fs216c65_ops;
+static const struct clk_ops st_quadfs_fs432c65_ops;
+static const struct clk_ops st_quadfs_fs660c32_ops;
+
+static int clk_fs216c65_get_rate(unsigned long, struct stm_fs *,
+ unsigned long *);
+static int clk_fs432c65_get_rate(unsigned long, struct stm_fs *,
+ unsigned long *);
+static int clk_fs660c32_dig_get_rate(unsigned long, struct stm_fs *,
+ unsigned long *);
+/*
+ * Values for all of the standalone instances of this clock
+ * generator found in STiH415 and STiH416 SYSCFG register banks. Note
+ * that the individual channel standby control bits (nsb) are in the
+ * first register along with the PLL control bits.
+ */
+static struct clkgen_quadfs_data st_fs216c65_416 = {
+ /* 416 specific */
+ .npda = CLKGEN_FIELD(0x0, 0x1, 14),
+ .nsb = { CLKGEN_FIELD(0x0, 0x1, 10),
+ CLKGEN_FIELD(0x0, 0x1, 11),
+ CLKGEN_FIELD(0x0, 0x1, 12),
+ CLKGEN_FIELD(0x0, 0x1, 13) },
+ .nsdiv_present = true,
+ .nsdiv = { CLKGEN_FIELD(0x0, 0x1, 18),
+ CLKGEN_FIELD(0x0, 0x1, 19),
+ CLKGEN_FIELD(0x0, 0x1, 20),
+ CLKGEN_FIELD(0x0, 0x1, 21) },
+ .mdiv = { CLKGEN_FIELD(0x4, 0x1f, 0),
+ CLKGEN_FIELD(0x14, 0x1f, 0),
+ CLKGEN_FIELD(0x24, 0x1f, 0),
+ CLKGEN_FIELD(0x34, 0x1f, 0) },
+ .en = { CLKGEN_FIELD(0x10, 0x1, 0),
+ CLKGEN_FIELD(0x20, 0x1, 0),
+ CLKGEN_FIELD(0x30, 0x1, 0),
+ CLKGEN_FIELD(0x40, 0x1, 0) },
+ .ndiv = CLKGEN_FIELD(0x0, 0x1, 15),
+ .bwfilter_present = true,
+ .ref_bw = CLKGEN_FIELD(0x0, 0x3, 16),
+ .pe = { CLKGEN_FIELD(0x8, 0xffff, 0),
+ CLKGEN_FIELD(0x18, 0xffff, 0),
+ CLKGEN_FIELD(0x28, 0xffff, 0),
+ CLKGEN_FIELD(0x38, 0xffff, 0) },
+ .sdiv = { CLKGEN_FIELD(0xC, 0x7, 0),
+ CLKGEN_FIELD(0x1C, 0x7, 0),
+ CLKGEN_FIELD(0x2C, 0x7, 0),
+ CLKGEN_FIELD(0x3C, 0x7, 0) },
+ .pll_ops = &st_quadfs_pll_c65_ops,
+ .rtbl = fs216c65_rtbl,
+ .rtbl_cnt = ARRAY_SIZE(fs216c65_rtbl),
+ .get_rate = clk_fs216c65_get_rate,
+};
+
+static struct clkgen_quadfs_data st_fs432c65_416 = {
+ .npda = CLKGEN_FIELD(0x0, 0x1, 14),
+ .nsb = { CLKGEN_FIELD(0x0, 0x1, 10),
+ CLKGEN_FIELD(0x0, 0x1, 11),
+ CLKGEN_FIELD(0x0, 0x1, 12),
+ CLKGEN_FIELD(0x0, 0x1, 13) },
+ .nsdiv_present = true,
+ .nsdiv = { CLKGEN_FIELD(0x0, 0x1, 18),
+ CLKGEN_FIELD(0x0, 0x1, 19),
+ CLKGEN_FIELD(0x0, 0x1, 20),
+ CLKGEN_FIELD(0x0, 0x1, 21) },
+ .mdiv = { CLKGEN_FIELD(0x4, 0x1f, 0),
+ CLKGEN_FIELD(0x14, 0x1f, 0),
+ CLKGEN_FIELD(0x24, 0x1f, 0),
+ CLKGEN_FIELD(0x34, 0x1f, 0) },
+ .en = { CLKGEN_FIELD(0x10, 0x1, 0),
+ CLKGEN_FIELD(0x20, 0x1, 0),
+ CLKGEN_FIELD(0x30, 0x1, 0),
+ CLKGEN_FIELD(0x40, 0x1, 0) },
+ .ndiv = CLKGEN_FIELD(0x0, 0x1, 15),
+ .bwfilter_present = true,
+ .ref_bw = CLKGEN_FIELD(0x0, 0x3, 16),
+ .pe = { CLKGEN_FIELD(0x8, 0xffff, 0),
+ CLKGEN_FIELD(0x18, 0xffff, 0),
+ CLKGEN_FIELD(0x28, 0xffff, 0),
+ CLKGEN_FIELD(0x38, 0xffff, 0) },
+ .sdiv = { CLKGEN_FIELD(0xC, 0x7, 0),
+ CLKGEN_FIELD(0x1C, 0x7, 0),
+ CLKGEN_FIELD(0x2C, 0x7, 0),
+ CLKGEN_FIELD(0x3C, 0x7, 0) },
+ .pll_ops = &st_quadfs_pll_c65_ops,
+ .rtbl = fs432c65_rtbl,
+ .rtbl_cnt = ARRAY_SIZE(fs432c65_rtbl),
+ .get_rate = clk_fs432c65_get_rate,
+};
+
+static struct clkgen_quadfs_data st_fs660c32_E_416 = {
+ .npda = CLKGEN_FIELD(0x0, 0x1, 14),
+ .nsb = { CLKGEN_FIELD(0x0, 0x1, 10),
+ CLKGEN_FIELD(0x0, 0x1, 11),
+ CLKGEN_FIELD(0x0, 0x1, 12),
+ CLKGEN_FIELD(0x0, 0x1, 13) },
+ .nsdiv_present = true,
+ .nsdiv = { CLKGEN_FIELD(0x0, 0x1, 18),
+ CLKGEN_FIELD(0x0, 0x1, 19),
+ CLKGEN_FIELD(0x0, 0x1, 20),
+ CLKGEN_FIELD(0x0, 0x1, 21) },
+ .mdiv = { CLKGEN_FIELD(0x4, 0x1f, 0),
+ CLKGEN_FIELD(0x14, 0x1f, 0),
+ CLKGEN_FIELD(0x24, 0x1f, 0),
+ CLKGEN_FIELD(0x34, 0x1f, 0) },
+ .en = { CLKGEN_FIELD(0x10, 0x1, 0),
+ CLKGEN_FIELD(0x20, 0x1, 0),
+ CLKGEN_FIELD(0x30, 0x1, 0),
+ CLKGEN_FIELD(0x40, 0x1, 0) },
+ .ndiv = CLKGEN_FIELD(0x0, 0x7, 15),
+ .pe = { CLKGEN_FIELD(0x8, 0x7fff, 0),
+ CLKGEN_FIELD(0x18, 0x7fff, 0),
+ CLKGEN_FIELD(0x28, 0x7fff, 0),
+ CLKGEN_FIELD(0x38, 0x7fff, 0) },
+ .sdiv = { CLKGEN_FIELD(0xC, 0xf, 0),
+ CLKGEN_FIELD(0x1C, 0xf, 0),
+ CLKGEN_FIELD(0x2C, 0xf, 0),
+ CLKGEN_FIELD(0x3C, 0xf, 0) },
+ .lockstatus_present = true,
+ .lock_status = CLKGEN_FIELD(0xAC, 0x1, 0),
+ .pll_ops = &st_quadfs_pll_c32_ops,
+ .rtbl = fs660c32_rtbl,
+ .rtbl_cnt = ARRAY_SIZE(fs660c32_rtbl),
+ .get_rate = clk_fs660c32_dig_get_rate,
+};
+
+static struct clkgen_quadfs_data st_fs660c32_F_416 = {
+ .npda = CLKGEN_FIELD(0x0, 0x1, 14),
+ .nsb = { CLKGEN_FIELD(0x0, 0x1, 10),
+ CLKGEN_FIELD(0x0, 0x1, 11),
+ CLKGEN_FIELD(0x0, 0x1, 12),
+ CLKGEN_FIELD(0x0, 0x1, 13) },
+ .nsdiv_present = true,
+ .nsdiv = { CLKGEN_FIELD(0x0, 0x1, 18),
+ CLKGEN_FIELD(0x0, 0x1, 19),
+ CLKGEN_FIELD(0x0, 0x1, 20),
+ CLKGEN_FIELD(0x0, 0x1, 21) },
+ .mdiv = { CLKGEN_FIELD(0x4, 0x1f, 0),
+ CLKGEN_FIELD(0x14, 0x1f, 0),
+ CLKGEN_FIELD(0x24, 0x1f, 0),
+ CLKGEN_FIELD(0x34, 0x1f, 0) },
+ .en = { CLKGEN_FIELD(0x10, 0x1, 0),
+ CLKGEN_FIELD(0x20, 0x1, 0),
+ CLKGEN_FIELD(0x30, 0x1, 0),
+ CLKGEN_FIELD(0x40, 0x1, 0) },
+ .ndiv = CLKGEN_FIELD(0x0, 0x7, 15),
+ .pe = { CLKGEN_FIELD(0x8, 0x7fff, 0),
+ CLKGEN_FIELD(0x18, 0x7fff, 0),
+ CLKGEN_FIELD(0x28, 0x7fff, 0),
+ CLKGEN_FIELD(0x38, 0x7fff, 0) },
+ .sdiv = { CLKGEN_FIELD(0xC, 0xf, 0),
+ CLKGEN_FIELD(0x1C, 0xf, 0),
+ CLKGEN_FIELD(0x2C, 0xf, 0),
+ CLKGEN_FIELD(0x3C, 0xf, 0) },
+ .lockstatus_present = true,
+ .lock_status = CLKGEN_FIELD(0xEC, 0x1, 0),
+ .pll_ops = &st_quadfs_pll_c32_ops,
+ .rtbl = fs660c32_rtbl,
+ .rtbl_cnt = ARRAY_SIZE(fs660c32_rtbl),
+ .get_rate = clk_fs660c32_dig_get_rate,
+};
+
+/**
+ * DOC: A Frequency Synthesizer that multiples its input clock by a fixed factor
+ *
+ * Traits of this clock:
+ * prepare - clk_(un)prepare only ensures parent is (un)prepared
+ * enable - clk_enable and clk_disable are functional & control the Fsyn
+ * rate - inherits rate from parent. set_rate/round_rate/recalc_rate
+ * parent - fixed parent. No clk_set_parent support
+ */
+
+/**
+ * struct st_clk_quadfs_pll - A pll which outputs a fixed multiplier of
+ * its parent clock, found inside a type of
+ * ST quad channel frequency synthesizer block
+ *
+ * @hw: handle between common and hardware-specific interfaces.
+ * @ndiv: regmap field for the ndiv control.
+ * @regs_base: base address of the configuration registers.
+ * @lock: spinlock.
+ *
+ */
+struct st_clk_quadfs_pll {
+ struct clk_hw hw;
+ void __iomem *regs_base;
+ spinlock_t *lock;
+ struct clkgen_quadfs_data *data;
+ u32 ndiv;
+};
+
+#define to_quadfs_pll(_hw) container_of(_hw, struct st_clk_quadfs_pll, hw)
+
+static int quadfs_pll_enable(struct clk_hw *hw)
+{
+ struct st_clk_quadfs_pll *pll = to_quadfs_pll(hw);
+ unsigned long flags = 0, timeout = jiffies + msecs_to_jiffies(10);
+
+ if (pll->lock)
+ spin_lock_irqsave(pll->lock, flags);
+
+ /*
+ * Bring block out of reset if we have reset control.
+ */
+ if (pll->data->reset_present)
+ CLKGEN_WRITE(pll, nreset, 1);
+
+ /*
+ * Use a fixed input clock noise bandwidth filter for the moment
+ */
+ if (pll->data->bwfilter_present)
+ CLKGEN_WRITE(pll, ref_bw, PLL_BW_GOODREF);
+
+
+ CLKGEN_WRITE(pll, ndiv, pll->ndiv);
+
+ /*
+ * Power up the PLL
+ */
+ CLKGEN_WRITE(pll, npda, 1);
+
+ if (pll->lock)
+ spin_unlock_irqrestore(pll->lock, flags);
+
+ if (pll->data->lockstatus_present)
+ while (!CLKGEN_READ(pll, lock_status)) {
+ if (time_after(jiffies, timeout))
+ return -ETIMEDOUT;
+ cpu_relax();
+ }
+
+ return 0;
+}
+
+static void quadfs_pll_disable(struct clk_hw *hw)
+{
+ struct st_clk_quadfs_pll *pll = to_quadfs_pll(hw);
+ unsigned long flags = 0;
+
+ if (pll->lock)
+ spin_lock_irqsave(pll->lock, flags);
+
+ /*
+ * Powerdown the PLL and then put block into soft reset if we have
+ * reset control.
+ */
+ CLKGEN_WRITE(pll, npda, 0);
+
+ if (pll->data->reset_present)
+ CLKGEN_WRITE(pll, nreset, 0);
+
+ if (pll->lock)
+ spin_unlock_irqrestore(pll->lock, flags);
+}
+
+static int quadfs_pll_is_enabled(struct clk_hw *hw)
+{
+ struct st_clk_quadfs_pll *pll = to_quadfs_pll(hw);
+ u32 npda = CLKGEN_READ(pll, npda);
+
+ return !!npda;
+}
+
+int clk_fs660c32_vco_get_rate(unsigned long input, struct stm_fs *fs,
+ unsigned long *rate)
+{
+ unsigned long nd = fs->ndiv + 16; /* ndiv value */
+
+ *rate = input * nd;
+
+ return 0;
+}
+
+static unsigned long quadfs_pll_fs660c32_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct st_clk_quadfs_pll *pll = to_quadfs_pll(hw);
+ unsigned long rate = 0;
+ struct stm_fs params;
+
+ params.ndiv = CLKGEN_READ(pll, ndiv);
+ if (clk_fs660c32_vco_get_rate(parent_rate, &params, &rate))
+ pr_err("%s:%s error calculating rate\n",
+ __clk_get_name(hw->clk), __func__);
+
+ pll->ndiv = params.ndiv;
+
+ return rate;
+}
+
+int clk_fs660c32_vco_get_params(unsigned long input,
+ unsigned long output, struct stm_fs *fs)
+{
+/* Formula
+ VCO frequency = (fin x ndiv) / pdiv
+ ndiv = VCOfreq * pdiv / fin
+ */
+ unsigned long pdiv = 1, n;
+
+ /* Output clock range: 384Mhz to 660Mhz */
+ if (output < 384000000 || output > 660000000)
+ return -EINVAL;
+
+ if (input > 40000000)
+ /* This means that PDIV would be 2 instead of 1.
+ Not supported today. */
+ return -EINVAL;
+
+ input /= 1000;
+ output /= 1000;
+
+ n = output * pdiv / input;
+ if (n < 16)
+ n = 16;
+ fs->ndiv = n - 16; /* Converting formula value to reg value */
+
+ return 0;
+}
+
+static long quadfs_pll_fs660c32_round_rate(struct clk_hw *hw, unsigned long rate
+ , unsigned long *prate)
+{
+ struct stm_fs params;
+
+ if (!clk_fs660c32_vco_get_params(*prate, rate, &params))
+ clk_fs660c32_vco_get_rate(*prate, &params, &rate);
+
+ pr_debug("%s: %s new rate %ld [sdiv=0x%x,md=0x%x,pe=0x%x,nsdiv3=%u]\n",
+ __func__, __clk_get_name(hw->clk),
+ rate, (unsigned int)params.sdiv,
+ (unsigned int)params.mdiv,
+ (unsigned int)params.pe, (unsigned int)params.nsdiv);
+
+ return rate;
+}
+
+static int quadfs_pll_fs660c32_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct st_clk_quadfs_pll *pll = to_quadfs_pll(hw);
+ struct stm_fs params;
+ long hwrate = 0;
+ unsigned long flags = 0;
+
+ if (!rate || !parent_rate)
+ return -EINVAL;
+
+ if (!clk_fs660c32_vco_get_params(parent_rate, rate, &params))
+ clk_fs660c32_vco_get_rate(parent_rate, &params, &hwrate);
+
+ pr_debug("%s: %s new rate %ld [ndiv=0x%x]\n",
+ __func__, __clk_get_name(hw->clk),
+ hwrate, (unsigned int)params.ndiv);
+
+ if (!hwrate)
+ return -EINVAL;
+
+ pll->ndiv = params.ndiv;
+
+ if (pll->lock)
+ spin_lock_irqsave(pll->lock, flags);
+
+ CLKGEN_WRITE(pll, ndiv, pll->ndiv);
+
+ if (pll->lock)
+ spin_unlock_irqrestore(pll->lock, flags);
+
+ return 0;
+}
+
+static const struct clk_ops st_quadfs_pll_c65_ops = {
+ .enable = quadfs_pll_enable,
+ .disable = quadfs_pll_disable,
+ .is_enabled = quadfs_pll_is_enabled,
+};
+
+static const struct clk_ops st_quadfs_pll_c32_ops = {
+ .enable = quadfs_pll_enable,
+ .disable = quadfs_pll_disable,
+ .is_enabled = quadfs_pll_is_enabled,
+ .recalc_rate = quadfs_pll_fs660c32_recalc_rate,
+ .round_rate = quadfs_pll_fs660c32_round_rate,
+ .set_rate = quadfs_pll_fs660c32_set_rate,
+};
+
+static struct clk * __init st_clk_register_quadfs_pll(
+ const char *name, const char *parent_name,
+ struct clkgen_quadfs_data *quadfs, void __iomem *reg,
+ spinlock_t *lock)
+{
+ struct st_clk_quadfs_pll *pll;
+ struct clk *clk;
+ struct clk_init_data init;
+
+ /*
+ * Sanity check required pointers.
+ */
+ if (WARN_ON(!name || !parent_name))
+ return ERR_PTR(-EINVAL);
+
+ pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+ if (!pll)
+ return ERR_PTR(-ENOMEM);
+
+ init.name = name;
+ init.ops = quadfs->pll_ops;
+ init.flags = CLK_IS_BASIC;
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+
+ pll->data = quadfs;
+ pll->regs_base = reg;
+ pll->lock = lock;
+ pll->hw.init = &init;
+
+ clk = clk_register(NULL, &pll->hw);
+
+ if (IS_ERR(clk))
+ kfree(pll);
+
+ return clk;
+}
+
+/**
+ * DOC: A digital frequency synthesizer
+ *
+ * Traits of this clock:
+ * prepare - clk_(un)prepare only ensures parent is (un)prepared
+ * enable - clk_enable and clk_disable are functional
+ * rate - set rate is functional
+ * parent - fixed parent. No clk_set_parent support
+ */
+
+/**
+ * struct st_clk_quadfs_fsynth - One clock output from a four channel digital
+ * frequency synthesizer (fsynth) block.
+ *
+ * @hw: handle between common and hardware-specific interfaces
+ *
+ * @nsb: regmap field in the output control register for the digital
+ * standby of this fsynth channel. This control is active low so
+ * the channel is in standby when the control bit is cleared.
+ *
+ * @nsdiv: regmap field in the output control register for
+ * for the optional divide by 3 of this fsynth channel. This control
+ * is active low so the divide by 3 is active when the control bit is
+ * cleared and the divide is bypassed when the bit is set.
+ */
+struct st_clk_quadfs_fsynth {
+ struct clk_hw hw;
+ void __iomem *regs_base;
+ spinlock_t *lock;
+ struct clkgen_quadfs_data *data;
+
+ u32 chan;
+ /*
+ * Cached hardware values from set_rate so we can program the
+ * hardware in enable. There are two reasons for this:
+ *
+ * 1. The registers may not be writable until the parent has been
+ * enabled.
+ *
+ * 2. It restores the clock rate when a driver does an enable
+ * on PM restore, after a suspend to RAM has lost the hardware
+ * setup.
+ */
+ u32 md;
+ u32 pe;
+ u32 sdiv;
+ u32 nsdiv;
+};
+
+#define to_quadfs_fsynth(_hw) \
+ container_of(_hw, struct st_clk_quadfs_fsynth, hw)
+
+static void quadfs_fsynth_program_enable(struct st_clk_quadfs_fsynth *fs)
+{
+ /*
+ * Pulse the program enable register lsb to make the hardware take
+ * notice of the new md/pe values with a glitchless transition.
+ */
+ CLKGEN_WRITE(fs, en[fs->chan], 1);
+ CLKGEN_WRITE(fs, en[fs->chan], 0);
+}
+
+static void quadfs_fsynth_program_rate(struct st_clk_quadfs_fsynth *fs)
+{
+ unsigned long flags = 0;
+
+ /*
+ * Ensure the md/pe parameters are ignored while we are
+ * reprogramming them so we can get a glitchless change
+ * when fine tuning the speed of a running clock.
+ */
+ CLKGEN_WRITE(fs, en[fs->chan], 0);
+
+ CLKGEN_WRITE(fs, mdiv[fs->chan], fs->md);
+ CLKGEN_WRITE(fs, pe[fs->chan], fs->pe);
+ CLKGEN_WRITE(fs, sdiv[fs->chan], fs->sdiv);
+
+ if (fs->lock)
+ spin_lock_irqsave(fs->lock, flags);
+
+ if (fs->data->nsdiv_present)
+ CLKGEN_WRITE(fs, nsdiv[fs->chan], fs->nsdiv);
+
+ if (fs->lock)
+ spin_unlock_irqrestore(fs->lock, flags);
+}
+
+static int quadfs_fsynth_enable(struct clk_hw *hw)
+{
+ struct st_clk_quadfs_fsynth *fs = to_quadfs_fsynth(hw);
+ unsigned long flags = 0;
+
+ pr_debug("%s: %s\n", __func__, __clk_get_name(hw->clk));
+
+ quadfs_fsynth_program_rate(fs);
+
+ if (fs->lock)
+ spin_lock_irqsave(fs->lock, flags);
+
+ CLKGEN_WRITE(fs, nsb[fs->chan], 1);
+
+ if (fs->lock)
+ spin_unlock_irqrestore(fs->lock, flags);
+
+ quadfs_fsynth_program_enable(fs);
+
+ return 0;
+}
+
+static void quadfs_fsynth_disable(struct clk_hw *hw)
+{
+ struct st_clk_quadfs_fsynth *fs = to_quadfs_fsynth(hw);
+ unsigned long flags = 0;
+
+ pr_debug("%s: %s\n", __func__, __clk_get_name(hw->clk));
+
+ if (fs->lock)
+ spin_lock_irqsave(fs->lock, flags);
+
+ CLKGEN_WRITE(fs, nsb[fs->chan], 0);
+
+ if (fs->lock)
+ spin_unlock_irqrestore(fs->lock, flags);
+}
+
+static int quadfs_fsynth_is_enabled(struct clk_hw *hw)
+{
+ struct st_clk_quadfs_fsynth *fs = to_quadfs_fsynth(hw);
+ u32 nsb = CLKGEN_READ(fs, nsb[fs->chan]);
+
+ pr_debug("%s: %s enable bit = 0x%x\n",
+ __func__, __clk_get_name(hw->clk), nsb);
+
+ return !!nsb;
+}
+
+#define P15 (uint64_t)(1 << 15)
+
+static int clk_fs216c65_get_rate(unsigned long input, struct stm_fs *fs,
+ unsigned long *rate)
+{
+ uint64_t res;
+ unsigned long ns;
+ unsigned long nd = 8; /* ndiv stuck at 0 => val = 8 */
+ unsigned long s;
+ long m;
+
+ m = fs->mdiv - 32;
+ s = 1 << (fs->sdiv + 1);
+ ns = (fs->nsdiv ? 1 : 3);
+
+ res = (uint64_t)(s * ns * P15 * (uint64_t)(m + 33));
+ res = res - (s * ns * fs->pe);
+ *rate = div64_u64(P15 * nd * input * 32, res);
+
+ return 0;
+}
+
+static int clk_fs432c65_get_rate(unsigned long input, struct stm_fs *fs,
+ unsigned long *rate)
+{
+ uint64_t res;
+ unsigned long nd = 16; /* ndiv value; stuck at 0 (30Mhz input) */
+ long m;
+ unsigned long sd;
+ unsigned long ns;
+
+ m = fs->mdiv - 32;
+ sd = 1 << (fs->sdiv + 1);
+ ns = (fs->nsdiv ? 1 : 3);
+
+ res = (uint64_t)(sd * ns * P15 * (uint64_t)(m + 33));
+ res = res - (sd * ns * fs->pe);
+ *rate = div64_u64(P15 * nd * input * 32, res);
+
+ return 0;
+}
+
+#define P20 (uint64_t)(1 << 20)
+
+static int clk_fs660c32_dig_get_rate(unsigned long input,
+ struct stm_fs *fs, unsigned long *rate)
+{
+ unsigned long s = (1 << fs->sdiv);
+ unsigned long ns;
+ uint64_t res;
+
+ /*
+ * 'nsdiv' is a register value ('BIN') which is translated
+ * to a decimal value according to following rules.
+ *
+ * nsdiv ns.dec
+ * 0 3
+ * 1 1
+ */
+ ns = (fs->nsdiv == 1) ? 1 : 3;
+
+ res = (P20 * (32 + fs->mdiv) + 32 * fs->pe) * s * ns;
+ *rate = (unsigned long)div64_u64(input * P20 * 32, res);
+
+ return 0;
+}
+
+static int quadfs_fsynt_get_hw_value_for_recalc(struct st_clk_quadfs_fsynth *fs,
+ struct stm_fs *params)
+{
+ /*
+ * Get the initial hardware values for recalc_rate
+ */
+ params->mdiv = CLKGEN_READ(fs, mdiv[fs->chan]);
+ params->pe = CLKGEN_READ(fs, pe[fs->chan]);
+ params->sdiv = CLKGEN_READ(fs, sdiv[fs->chan]);
+
+ if (fs->data->nsdiv_present)
+ params->nsdiv = CLKGEN_READ(fs, nsdiv[fs->chan]);
+ else
+ params->nsdiv = 1;
+
+ /*
+ * If All are NULL then assume no clock rate is programmed.
+ */
+ if (!params->mdiv && !params->pe && !params->sdiv)
+ return 1;
+
+ fs->md = params->mdiv;
+ fs->pe = params->pe;
+ fs->sdiv = params->sdiv;
+ fs->nsdiv = params->nsdiv;
+
+ return 0;
+}
+
+static long quadfs_find_best_rate(struct clk_hw *hw, unsigned long drate,
+ unsigned long prate, struct stm_fs *params)
+{
+ struct st_clk_quadfs_fsynth *fs = to_quadfs_fsynth(hw);
+ int (*clk_fs_get_rate)(unsigned long ,
+ struct stm_fs *, unsigned long *);
+ struct stm_fs prev_params;
+ unsigned long prev_rate, rate = 0;
+ unsigned long diff_rate, prev_diff_rate = ~0;
+ int index;
+
+ clk_fs_get_rate = fs->data->get_rate;
+
+ for (index = 0; index < fs->data->rtbl_cnt; index++) {
+ prev_rate = rate;
+
+ *params = fs->data->rtbl[index];
+ prev_params = *params;
+
+ clk_fs_get_rate(prate, &fs->data->rtbl[index], &rate);
+
+ diff_rate = abs(drate - rate);
+
+ if (diff_rate > prev_diff_rate) {
+ rate = prev_rate;
+ *params = prev_params;
+ break;
+ }
+
+ prev_diff_rate = diff_rate;
+
+ if (drate == rate)
+ return rate;
+ }
+
+
+ if (index == fs->data->rtbl_cnt)
+ *params = prev_params;
+
+ return rate;
+}
+
+static unsigned long quadfs_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct st_clk_quadfs_fsynth *fs = to_quadfs_fsynth(hw);
+ unsigned long rate = 0;
+ struct stm_fs params;
+ int (*clk_fs_get_rate)(unsigned long ,
+ struct stm_fs *, unsigned long *);
+
+ clk_fs_get_rate = fs->data->get_rate;
+
+ if (quadfs_fsynt_get_hw_value_for_recalc(fs, &params))
+ return 0;
+
+ if (clk_fs_get_rate(parent_rate, &params, &rate)) {
+ pr_err("%s:%s error calculating rate\n",
+ __clk_get_name(hw->clk), __func__);
+ }
+
+ pr_debug("%s:%s rate %lu\n", __clk_get_name(hw->clk), __func__, rate);
+
+ return rate;
+}
+
+static long quadfs_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct stm_fs params;
+
+ rate = quadfs_find_best_rate(hw, rate, *prate, &params);
+
+ pr_debug("%s: %s new rate %ld [sdiv=0x%x,md=0x%x,pe=0x%x,nsdiv3=%u]\n",
+ __func__, __clk_get_name(hw->clk),
+ rate, (unsigned int)params.sdiv, (unsigned int)params.mdiv,
+ (unsigned int)params.pe, (unsigned int)params.nsdiv);
+
+ return rate;
+}
+
+
+static void quadfs_program_and_enable(struct st_clk_quadfs_fsynth *fs,
+ struct stm_fs *params)
+{
+ fs->md = params->mdiv;
+ fs->pe = params->pe;
+ fs->sdiv = params->sdiv;
+ fs->nsdiv = params->nsdiv;
+
+ /*
+ * In some integrations you can only change the fsynth programming when
+ * the parent entity containing it is enabled.
+ */
+ quadfs_fsynth_program_rate(fs);
+ quadfs_fsynth_program_enable(fs);
+}
+
+static int quadfs_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct st_clk_quadfs_fsynth *fs = to_quadfs_fsynth(hw);
+ struct stm_fs params;
+ long hwrate;
+ int uninitialized_var(i);
+
+ if (!rate || !parent_rate)
+ return -EINVAL;
+
+ memset(&params, 0, sizeof(struct stm_fs));
+
+ hwrate = quadfs_find_best_rate(hw, rate, parent_rate, &params);
+ if (!hwrate)
+ return -EINVAL;
+
+ quadfs_program_and_enable(fs, &params);
+
+ return 0;
+}
+
+
+
+static const struct clk_ops st_quadfs_ops = {
+ .enable = quadfs_fsynth_enable,
+ .disable = quadfs_fsynth_disable,
+ .is_enabled = quadfs_fsynth_is_enabled,
+ .round_rate = quadfs_round_rate,
+ .set_rate = quadfs_set_rate,
+ .recalc_rate = quadfs_recalc_rate,
+};
+
+static struct clk * __init st_clk_register_quadfs_fsynth(
+ const char *name, const char *parent_name,
+ struct clkgen_quadfs_data *quadfs, void __iomem *reg, u32 chan,
+ spinlock_t *lock)
+{
+ struct st_clk_quadfs_fsynth *fs;
+ struct clk *clk;
+ struct clk_init_data init;
+
+ /*
+ * Sanity check required pointers, note that nsdiv3 is optional.
+ */
+ if (WARN_ON(!name || !parent_name))
+ return ERR_PTR(-EINVAL);
+
+ fs = kzalloc(sizeof(*fs), GFP_KERNEL);
+ if (!fs)
+ return ERR_PTR(-ENOMEM);
+
+ init.name = name;
+ init.ops = &st_quadfs_ops;
+ init.flags = CLK_GET_RATE_NOCACHE | CLK_IS_BASIC;
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+
+ fs->data = quadfs;
+ fs->regs_base = reg;
+ fs->chan = chan;
+ fs->lock = lock;
+ fs->hw.init = &init;
+
+ clk = clk_register(NULL, &fs->hw);
+
+ if (IS_ERR(clk))
+ kfree(fs);
+
+ return clk;
+}
+
+static struct of_device_id quadfs_of_match[] = {
+ {
+ .compatible = "st,stih416-quadfs216",
+ .data = (void *)&st_fs216c65_416
+ },
+ {
+ .compatible = "st,stih416-quadfs432",
+ .data = (void *)&st_fs432c65_416
+ },
+ {
+ .compatible = "st,stih416-quadfs660-E",
+ .data = (void *)&st_fs660c32_E_416
+ },
+ {
+ .compatible = "st,stih416-quadfs660-F",
+ .data = (void *)&st_fs660c32_F_416
+ },
+ {}
+};
+
+static void __init st_of_create_quadfs_fsynths(
+ struct device_node *np, const char *pll_name,
+ struct clkgen_quadfs_data *quadfs, void __iomem *reg,
+ spinlock_t *lock)
+{
+ struct clk_onecell_data *clk_data;
+ int fschan;
+
+ clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
+ if (!clk_data)
+ return;
+
+ clk_data->clk_num = QUADFS_MAX_CHAN;
+ clk_data->clks = kzalloc(QUADFS_MAX_CHAN * sizeof(struct clk *),
+ GFP_KERNEL);
+
+ if (!clk_data->clks) {
+ kfree(clk_data);
+ return;
+ }
+
+ for (fschan = 0; fschan < QUADFS_MAX_CHAN; fschan++) {
+ struct clk *clk;
+ const char *clk_name;
+
+ if (of_property_read_string_index(np, "clock-output-names",
+ fschan, &clk_name)) {
+ break;
+ }
+
+ /*
+ * If we read an empty clock name then the channel is unused
+ */
+ if (*clk_name == '\0')
+ continue;
+
+ clk = st_clk_register_quadfs_fsynth(clk_name, pll_name,
+ quadfs, reg, fschan, lock);
+
+ /*
+ * If there was an error registering this clock output, clean
+ * up and move on to the next one.
+ */
+ if (!IS_ERR(clk)) {
+ clk_data->clks[fschan] = clk;
+ pr_debug("%s: parent %s rate %u\n",
+ __clk_get_name(clk),
+ __clk_get_name(clk_get_parent(clk)),
+ (unsigned int)clk_get_rate(clk));
+ }
+ }
+
+ of_clk_add_provider(np, of_clk_src_onecell_get, clk_data);
+}
+
+static void __init st_of_quadfs_setup(struct device_node *np)
+{
+ const struct of_device_id *match;
+ struct clk *clk;
+ const char *pll_name, *clk_parent_name;
+ void __iomem *reg;
+ spinlock_t *lock;
+
+ match = of_match_node(quadfs_of_match, np);
+ if (WARN_ON(!match))
+ return;
+
+ reg = of_iomap(np, 0);
+ if (!reg)
+ return;
+
+ clk_parent_name = of_clk_get_parent_name(np, 0);
+ if (!clk_parent_name)
+ return;
+
+ pll_name = kasprintf(GFP_KERNEL, "%s.pll", np->name);
+ if (!pll_name)
+ return;
+
+ lock = kzalloc(sizeof(*lock), GFP_KERNEL);
+ if (!lock)
+ goto err_exit;
+
+ spin_lock_init(lock);
+
+ clk = st_clk_register_quadfs_pll(pll_name, clk_parent_name,
+ (struct clkgen_quadfs_data *) match->data, reg, lock);
+ if (IS_ERR(clk))
+ goto err_exit;
+ else
+ pr_debug("%s: parent %s rate %u\n",
+ __clk_get_name(clk),
+ __clk_get_name(clk_get_parent(clk)),
+ (unsigned int)clk_get_rate(clk));
+
+ st_of_create_quadfs_fsynths(np, pll_name,
+ (struct clkgen_quadfs_data *)match->data,
+ reg, lock);
+
+err_exit:
+ kfree(pll_name); /* No longer need local copy of the PLL name */
+}
+CLK_OF_DECLARE(quadfs, "st,quadfs", st_of_quadfs_setup);
--
1.9.0


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