[PATCH v3 1/3] clk: meson: Add support for Meson clock controller
Carlo Caione
carlo at caione.org
Mon Jun 1 04:13:53 PDT 2015
From: Carlo Caione <carlo at endlessm.com>
This patchset adds the infrastructure for registering and managing the
core clocks found on Amlogic MesonX SoCs. In particular:
- PLLs
- CPU clock
- Fixed rate clocks, fixed factor clocks, ...
Signed-off-by: Carlo Caione <carlo at endlessm.com>
---
drivers/clk/Makefile | 1 +
drivers/clk/meson/Makefile | 5 +
drivers/clk/meson/clk-cpu.c | 234 +++++++++++++++++++++++++++++
drivers/clk/meson/clk-pll.c | 227 ++++++++++++++++++++++++++++
drivers/clk/meson/clkc.c | 247 +++++++++++++++++++++++++++++++
drivers/clk/meson/clkc.h | 187 +++++++++++++++++++++++
include/dt-bindings/clock/meson8b-clkc.h | 25 ++++
7 files changed, 926 insertions(+)
create mode 100644 drivers/clk/meson/Makefile
create mode 100644 drivers/clk/meson/clk-cpu.c
create mode 100644 drivers/clk/meson/clk-pll.c
create mode 100644 drivers/clk/meson/clkc.c
create mode 100644 drivers/clk/meson/clkc.h
create mode 100644 include/dt-bindings/clock/meson8b-clkc.h
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 3d00c25..9c4ddb1 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -55,6 +55,7 @@ ifeq ($(CONFIG_COMMON_CLK), y)
obj-$(CONFIG_ARCH_MMP) += mmp/
endif
obj-$(CONFIG_PLAT_ORION) += mvebu/
+obj-$(CONFIG_ARCH_MESON) += meson/
obj-$(CONFIG_ARCH_MXS) += mxs/
obj-$(CONFIG_MACH_PISTACHIO) += pistachio/
obj-$(CONFIG_COMMON_CLK_PXA) += pxa/
diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
new file mode 100644
index 0000000..66c6d8d
--- /dev/null
+++ b/drivers/clk/meson/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for Meson specific clk
+#
+
+obj-y += clkc.o clk-pll.o clk-cpu.o
diff --git a/drivers/clk/meson/clk-cpu.c b/drivers/clk/meson/clk-cpu.c
new file mode 100644
index 0000000..148e99f
--- /dev/null
+++ b/drivers/clk/meson/clk-cpu.c
@@ -0,0 +1,234 @@
+/*
+ * Copyright (c) 2015 Endless Mobile, Inc.
+ * Author: Carlo Caione <carlo at endlessm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * CPU clock path:
+ *
+ * +-[/N]-----|3|
+ * MUX2 +--[/3]-+----------|2| MUX1
+ * [sys_pll]---|1| |--[/2]------------|1|-|1|
+ * | |---+------------------|0| | |----- [a5_clk]
+ * +--|0| | |
+ * [xtal]---+-------------------------------|0|
+ *
+ *
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <linux/clk-provider.h>
+
+#define MESON_CPU_CLK_CNTL1 0x00
+#define MESON_CPU_CLK_CNTL 0x40
+
+#define MESON_CPU_CLK_MUX1 BIT(7)
+#define MESON_CPU_CLK_MUX2 BIT(0)
+
+#define MESON_N_WIDTH 9
+#define MESON_N_SHIFT 20
+#define MESON_SEL_WIDTH 2
+#define MESON_SEL_SHIFT 2
+
+#include "clkc.h"
+
+struct meson_clk_cpu {
+ struct notifier_block clk_nb;
+ const struct clk_div_table *div_table;
+ struct clk_hw hw;
+ void __iomem *base;
+ u16 reg_off;
+};
+#define to_meson_clk_cpu_hw(_hw) container_of(_hw, struct meson_clk_cpu, hw)
+#define to_meson_clk_cpu_nb(_nb) container_of(_nb, struct meson_clk_cpu, clk_nb)
+
+static long meson_clk_cpu_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct meson_clk_cpu *clk_cpu = to_meson_clk_cpu_hw(hw);
+
+ return divider_round_rate(hw, rate, prate, clk_cpu->div_table,
+ MESON_N_WIDTH, CLK_DIVIDER_ROUND_CLOSEST);
+}
+
+static int meson_clk_cpu_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct meson_clk_cpu *clk_cpu = to_meson_clk_cpu_hw(hw);
+ unsigned int div, sel, N = 0;
+ u32 reg;
+
+ div = DIV_ROUND_UP(parent_rate, rate);
+
+ if (div <= 3) {
+ sel = div - 1;
+ } else {
+ sel = 3;
+ N = div / 2;
+ }
+
+ reg = readl(clk_cpu->base + clk_cpu->reg_off + MESON_CPU_CLK_CNTL1);
+ reg = PARM_SET(MESON_N_WIDTH, MESON_N_SHIFT, reg, N);
+ writel(reg, clk_cpu->base + clk_cpu->reg_off + MESON_CPU_CLK_CNTL1);
+
+ reg = readl(clk_cpu->base + clk_cpu->reg_off + MESON_CPU_CLK_CNTL);
+ reg = PARM_SET(MESON_SEL_WIDTH, MESON_SEL_SHIFT, reg, sel);
+ writel(reg, clk_cpu->base + clk_cpu->reg_off + MESON_CPU_CLK_CNTL);
+
+ return 0;
+}
+
+static unsigned long meson_clk_cpu_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct meson_clk_cpu *clk_cpu = to_meson_clk_cpu_hw(hw);
+ unsigned int N, sel;
+ unsigned int div = 1;
+ u32 reg;
+
+ reg = readl(clk_cpu->base + clk_cpu->reg_off + MESON_CPU_CLK_CNTL1);
+ N = PARM_GET(MESON_N_WIDTH, MESON_N_SHIFT, reg);
+
+ reg = readl(clk_cpu->base + clk_cpu->reg_off + MESON_CPU_CLK_CNTL);
+ sel = PARM_GET(MESON_SEL_WIDTH, MESON_SEL_SHIFT, reg);
+
+ if (sel < 3)
+ div = sel + 1;
+ else
+ div = 2 * N;
+
+ return parent_rate / div;
+}
+
+static int meson_clk_cpu_pre_rate_change(struct meson_clk_cpu *clk_cpu,
+ struct clk_notifier_data *ndata)
+{
+ u32 cpu_clk_cntl;
+
+ /* switch MUX1 to xtal */
+ cpu_clk_cntl = readl(clk_cpu->base + clk_cpu->reg_off
+ + MESON_CPU_CLK_CNTL);
+ cpu_clk_cntl &= ~MESON_CPU_CLK_MUX1;
+ writel(cpu_clk_cntl, clk_cpu->base + clk_cpu->reg_off
+ + MESON_CPU_CLK_CNTL);
+ udelay(100);
+
+ /* switch MUX2 to sys-pll */
+ cpu_clk_cntl |= MESON_CPU_CLK_MUX2;
+ writel(cpu_clk_cntl, clk_cpu->base + clk_cpu->reg_off
+ + MESON_CPU_CLK_CNTL);
+
+ return 0;
+}
+
+static int meson_clk_cpu_post_rate_change(struct meson_clk_cpu *clk_cpu,
+ struct clk_notifier_data *ndata)
+{
+ u32 cpu_clk_cntl;
+
+ /* switch MUX1 to divisors' output */
+ cpu_clk_cntl = readl(clk_cpu->base + clk_cpu->reg_off
+ + MESON_CPU_CLK_CNTL);
+ cpu_clk_cntl |= MESON_CPU_CLK_MUX1;
+ writel(cpu_clk_cntl, clk_cpu->base + clk_cpu->reg_off
+ + MESON_CPU_CLK_CNTL);
+ udelay(100);
+
+ return 0;
+}
+
+/*
+ * This clock notifier is called when the frequency of the of the parent
+ * PLL clock is to be changed. We use the xtal input as temporary parent
+ * while the PLL frequency is stabilized.
+ */
+static int meson_clk_cpu_notifier_cb(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ struct clk_notifier_data *ndata = data;
+ struct meson_clk_cpu *clk_cpu = to_meson_clk_cpu_nb(nb);
+ int ret = 0;
+
+ if (event == PRE_RATE_CHANGE)
+ ret = meson_clk_cpu_pre_rate_change(clk_cpu, ndata);
+ else if (event == POST_RATE_CHANGE)
+ ret = meson_clk_cpu_post_rate_change(clk_cpu, ndata);
+
+ return notifier_from_errno(ret);
+}
+
+static const struct clk_ops meson_clk_cpu_ops = {
+ .recalc_rate = meson_clk_cpu_recalc_rate,
+ .round_rate = meson_clk_cpu_round_rate,
+ .set_rate = meson_clk_cpu_set_rate,
+};
+
+struct clk *meson_clk_register_cpu(const struct clk_conf *clk_conf,
+ void __iomem *reg_base,
+ spinlock_t *lock)
+{
+ struct clk *clk;
+ struct clk *pclk;
+ struct meson_clk_cpu *clk_cpu;
+ struct clk_init_data init;
+ int ret;
+
+ clk_cpu = kzalloc(sizeof(*clk_cpu), GFP_KERNEL);
+ if (!clk_cpu)
+ return ERR_PTR(-ENOMEM);
+
+ clk_cpu->base = reg_base;
+ clk_cpu->reg_off = clk_conf->reg_off;
+ clk_cpu->div_table = clk_conf->conf.div_table;
+ clk_cpu->clk_nb.notifier_call = meson_clk_cpu_notifier_cb;
+
+ init.name = clk_conf->clk_name;
+ init.ops = &meson_clk_cpu_ops;
+ init.flags = clk_conf->flags | CLK_GET_RATE_NOCACHE;
+ init.flags |= CLK_SET_RATE_PARENT;
+ init.parent_names = clk_conf->clks_parent;
+ init.num_parents = 1;
+
+ clk_cpu->hw.init = &init;
+
+ pclk = __clk_lookup(clk_conf->clks_parent[0]);
+ if (!pclk) {
+ pr_err("%s: could not lookup parent clock %s\n",
+ __func__, clk_conf->clks_parent[0]);
+ return ERR_PTR(-EINVAL);
+ }
+
+ ret = clk_notifier_register(pclk, &clk_cpu->clk_nb);
+ if (ret) {
+ pr_err("%s: failed to register clock notifier for %s\n",
+ __func__, clk_conf->clk_name);
+ return ERR_PTR(-EINVAL);
+ }
+
+ clk = clk_register(NULL, &clk_cpu->hw);
+ if (IS_ERR(clk)) {
+ clk_notifier_unregister(pclk, &clk_cpu->clk_nb);
+ kfree(clk_cpu);
+ }
+
+ return clk;
+}
+
diff --git a/drivers/clk/meson/clk-pll.c b/drivers/clk/meson/clk-pll.c
new file mode 100644
index 0000000..664edf0
--- /dev/null
+++ b/drivers/clk/meson/clk-pll.c
@@ -0,0 +1,227 @@
+/*
+ * Copyright (c) 2015 Endless Mobile, Inc.
+ * Author: Carlo Caione <carlo at endlessm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * In the most basic form, a Meson PLL is composed as follows:
+ *
+ * PLL
+ * +------------------------------+
+ * | |
+ * in -----[ /N ]---[ *M ]---[ >>OD ]----->> out
+ * | ^ ^ |
+ * +------------------------------+
+ * | |
+ * FREF VCO
+ *
+ * out = (in * M / N) >> OD
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include "clkc.h"
+
+#define MESON_PLL_RESET BIT(29)
+#define MESON_PLL_LOCK BIT(31)
+
+struct meson_clk_pll {
+ struct clk_hw hw;
+ void __iomem *base;
+ struct pll_conf *conf;
+ unsigned int rate_count;
+ spinlock_t *lock;
+};
+#define to_meson_clk_pll(_hw) container_of(_hw, struct meson_clk_pll, hw)
+
+static unsigned long meson_clk_pll_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct meson_clk_pll *pll = to_meson_clk_pll(hw);
+ struct parm *p;
+ unsigned long parent_rate_mhz = parent_rate / 1000000;
+ unsigned long rate_mhz;
+ u16 n, m, od;
+ u32 reg;
+
+ p = &pll->conf->n;
+ reg = readl(pll->base + p->reg_off);
+ n = PARM_GET(p->width, p->shift, reg);
+
+ p = &pll->conf->m;
+ reg = readl(pll->base + p->reg_off);
+ m = PARM_GET(p->width, p->shift, reg);
+
+ p = &pll->conf->od;
+ reg = readl(pll->base + p->reg_off);
+ od = PARM_GET(p->width, p->shift, reg);
+
+ rate_mhz = (parent_rate_mhz * m / n) >> od;
+
+ return rate_mhz * 1000000;
+}
+
+static long meson_clk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+{
+ struct meson_clk_pll *pll = to_meson_clk_pll(hw);
+ const struct pll_rate_table *rate_table = pll->conf->rate_table;
+ int i;
+
+ for (i = 0; i < pll->rate_count; i++) {
+ if (rate <= rate_table[i].rate)
+ return rate_table[i].rate;
+ }
+
+ /* else return the smallest value */
+ return rate_table[0].rate;
+}
+
+static const struct pll_rate_table *meson_clk_get_pll_settings(struct meson_clk_pll *pll,
+ unsigned long rate)
+{
+ const struct pll_rate_table *rate_table = pll->conf->rate_table;
+ int i;
+
+ for (i = 0; i < pll->rate_count; i++) {
+ if (rate == rate_table[i].rate)
+ return &rate_table[i];
+ }
+ return NULL;
+}
+
+static int meson_clk_pll_wait_lock(struct meson_clk_pll *pll,
+ struct parm *p_n)
+{
+ int delay = 24000000;
+ u32 reg;
+
+ while (delay > 0) {
+ reg = readl(pll->base + p_n->reg_off);
+
+ if (reg & MESON_PLL_LOCK)
+ return 0;
+ delay--;
+ }
+ return -ETIMEDOUT;
+}
+
+static int meson_clk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct meson_clk_pll *pll = to_meson_clk_pll(hw);
+ struct parm *p;
+ const struct pll_rate_table *rate_set;
+ unsigned long old_rate;
+ int ret = 0;
+ u32 reg;
+
+ if (parent_rate == 0 || rate == 0)
+ return -EINVAL;
+
+ old_rate = rate;
+
+ rate_set = meson_clk_get_pll_settings(pll, rate);
+ if (!rate_set)
+ return -EINVAL;
+
+ /* PLL reset */
+ p = &pll->conf->n;
+ reg = readl(pll->base + p->reg_off);
+ writel(reg | MESON_PLL_RESET, pll->base + p->reg_off);
+
+ reg = PARM_SET(p->width, p->shift, reg, rate_set->n);
+ writel(reg, pll->base + p->reg_off);
+
+ p = &pll->conf->m;
+ reg = readl(pll->base + p->reg_off);
+ reg = PARM_SET(p->width, p->shift, reg, rate_set->m);
+ writel(reg, pll->base + p->reg_off);
+
+ p = &pll->conf->od;
+ reg = readl(pll->base + p->reg_off);
+ reg = PARM_SET(p->width, p->shift, reg, rate_set->od);
+ writel(reg, pll->base + p->reg_off);
+
+ p = &pll->conf->n;
+ ret = meson_clk_pll_wait_lock(pll, p);
+ if (ret) {
+ pr_warn("%s: pll did not lock, trying to restore old rate %lu\n",
+ __func__, old_rate);
+ meson_clk_pll_set_rate(hw, old_rate, parent_rate);
+ }
+
+ return ret;
+}
+
+static const struct clk_ops meson_clk_pll_ops = {
+ .recalc_rate = meson_clk_pll_recalc_rate,
+ .round_rate = meson_clk_pll_round_rate,
+ .set_rate = meson_clk_pll_set_rate,
+};
+
+static const struct clk_ops meson_clk_pll_ro_ops = {
+ .recalc_rate = meson_clk_pll_recalc_rate,
+};
+
+struct clk *meson_clk_register_pll(const struct clk_conf *clk_conf,
+ void __iomem *reg_base,
+ spinlock_t *lock)
+{
+ struct clk *clk;
+ struct meson_clk_pll *clk_pll;
+ struct clk_init_data init;
+
+ clk_pll = kzalloc(sizeof(*clk_pll), GFP_KERNEL);
+ if (!clk_pll)
+ return ERR_PTR(-ENOMEM);
+
+ clk_pll->base = reg_base + clk_conf->reg_off;
+ clk_pll->lock = lock;
+ clk_pll->conf = clk_conf->conf.pll;
+
+ init.name = clk_conf->clk_name;
+ init.flags = clk_conf->flags | CLK_GET_RATE_NOCACHE;
+
+ init.parent_names = &clk_conf->clks_parent[0];
+ init.num_parents = 1;
+ init.ops = &meson_clk_pll_ro_ops;
+
+ /* If no rate_table is specified we assume the PLL is read-only */
+ if (clk_pll->conf->rate_table) {
+ int len;
+
+ for (len = 0; clk_pll->conf->rate_table[len].rate != 0; )
+ len++;
+
+ clk_pll->rate_count = len;
+ init.ops = &meson_clk_pll_ops;
+ }
+
+ clk_pll->hw.init = &init;
+
+ clk = clk_register(NULL, &clk_pll->hw);
+ if (IS_ERR(clk))
+ kfree(clk_pll);
+
+ return clk;
+}
diff --git a/drivers/clk/meson/clkc.c b/drivers/clk/meson/clkc.c
new file mode 100644
index 0000000..79ec495
--- /dev/null
+++ b/drivers/clk/meson/clkc.c
@@ -0,0 +1,247 @@
+/*
+ * Copyright (c) 2015 Endless Mobile, Inc.
+ * Author: Carlo Caione <carlo at endlessm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/mfd/syscon.h>
+#include <linux/slab.h>
+
+#include "clkc.h"
+
+static DEFINE_SPINLOCK(clk_lock);
+
+static struct clk **clks;
+static struct clk_onecell_data clk_data;
+
+struct clk ** __init meson_clk_init(struct device_node *np,
+ unsigned long nr_clks)
+{
+ clks = kcalloc(nr_clks, sizeof(*clks), GFP_KERNEL);
+ if (!clks)
+ return ERR_PTR(-ENOMEM);
+
+ clk_data.clks = clks;
+ clk_data.clk_num = nr_clks;
+ of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
+
+ return clks;
+}
+
+static void meson_clk_add_lookup(struct clk *clk, unsigned int id)
+{
+ if (clks && id)
+ clks[id] = clk;
+}
+
+static struct clk __init *meson_clk_register_composite(const struct clk_conf *clk_conf,
+ void __iomem *clk_base)
+{
+ struct clk *clk;
+ struct clk_mux *mux = NULL;
+ struct clk_divider *div = NULL;
+ struct clk_gate *gate = NULL;
+ const struct clk_ops *mux_ops = NULL;
+ const struct composite_conf *composite_conf;
+
+ composite_conf = clk_conf->conf.composite;
+
+ if (clk_conf->num_parents > 1) {
+ mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+ if (!mux)
+ return ERR_PTR(-ENOMEM);
+
+ mux->reg = clk_base + clk_conf->reg_off
+ + composite_conf->mux_parm.reg_off;
+ mux->shift = composite_conf->mux_parm.shift;
+ mux->mask = BIT(composite_conf->mux_parm.width) - 1;
+ mux->flags = composite_conf->mux_flags;
+ mux->lock = &clk_lock;
+ mux->table = composite_conf->mux_table;
+ mux_ops = (composite_conf->mux_flags & CLK_MUX_READ_ONLY) ?
+ &clk_mux_ro_ops : &clk_mux_ops;
+ }
+
+ if (MESON_PARM_APPLICABLE(&composite_conf->div_parm)) {
+ div = kzalloc(sizeof(*div), GFP_KERNEL);
+ if (!div) {
+ clk = ERR_PTR(-ENOMEM);
+ goto error;
+ }
+
+ div->reg = clk_base + clk_conf->reg_off
+ + composite_conf->div_parm.reg_off;
+ div->shift = composite_conf->div_parm.shift;
+ div->width = composite_conf->div_parm.width;
+ div->lock = &clk_lock;
+ div->flags = composite_conf->div_flags;
+ div->table = composite_conf->div_table;
+ }
+
+ if (MESON_PARM_APPLICABLE(&composite_conf->gate_parm)) {
+ gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+ if (!gate) {
+ clk = ERR_PTR(-ENOMEM);
+ goto error;
+ }
+
+ gate->reg = clk_base + clk_conf->reg_off
+ + composite_conf->div_parm.reg_off;
+ gate->bit_idx = composite_conf->gate_parm.shift;
+ gate->flags = composite_conf->gate_flags;
+ gate->lock = &clk_lock;
+ }
+
+ clk = clk_register_composite(NULL, clk_conf->clk_name,
+ clk_conf->clks_parent,
+ clk_conf->num_parents,
+ mux ? &mux->hw : NULL, mux_ops,
+ div ? &div->hw : NULL, &clk_divider_ops,
+ gate ? &gate->hw : NULL, &clk_gate_ops,
+ clk_conf->flags);
+ if (IS_ERR(clk))
+ goto error;
+
+ return clk;
+
+error:
+ kfree(gate);
+ kfree(div);
+ kfree(mux);
+
+ return clk;
+}
+
+static struct clk __init *meson_clk_register_fixed_factor(const struct clk_conf *clk_conf,
+ void __iomem *clk_base)
+{
+ struct clk *clk;
+ const struct fixed_fact_conf *fixed_fact_conf;
+ const struct parm *p;
+ unsigned int mult, div;
+ u32 reg;
+
+ fixed_fact_conf = &clk_conf->conf.fixed_fact;
+
+ mult = clk_conf->conf.fixed_fact.mult;
+ div = clk_conf->conf.fixed_fact.div;
+
+ if (!mult) {
+ mult = 1;
+ p = &fixed_fact_conf->mult_parm;
+ if (MESON_PARM_APPLICABLE(p)) {
+ reg = readl(clk_base + clk_conf->reg_off + p->reg_off);
+ mult = PARM_GET(p->width, p->shift, reg);
+ }
+ }
+
+ if (!div) {
+ div = 1;
+ p = &fixed_fact_conf->div_parm;
+ if (MESON_PARM_APPLICABLE(p)) {
+ reg = readl(clk_base + clk_conf->reg_off + p->reg_off);
+ mult = PARM_GET(p->width, p->shift, reg);
+ }
+ }
+
+ clk = clk_register_fixed_factor(NULL,
+ clk_conf->clk_name,
+ clk_conf->clks_parent[0],
+ clk_conf->flags,
+ mult, div);
+
+ return clk;
+}
+
+static struct clk __init *meson_clk_register_fixed_rate(const struct clk_conf *clk_conf,
+ void __iomem *clk_base)
+{
+ struct clk *clk;
+ const struct fixed_rate_conf *fixed_rate_conf;
+ const struct parm *r;
+ unsigned long rate;
+ u32 reg;
+
+ fixed_rate_conf = &clk_conf->conf.fixed_rate;
+ rate = fixed_rate_conf->rate;
+
+ if (!rate) {
+ r = &fixed_rate_conf->rate_parm;
+ reg = readl(clk_base + clk_conf->reg_off + r->reg_off);
+ rate = PARM_GET(r->width, r->shift, reg);
+ }
+
+ rate *= 1000000;
+
+ clk = clk_register_fixed_rate(NULL,
+ clk_conf->clk_name,
+ clk_conf->num_parents
+ ? clk_conf->clks_parent[0] : NULL,
+ clk_conf->flags, rate);
+
+ return clk;
+}
+
+void __init meson_clk_register_clks(const struct clk_conf *clk_confs,
+ size_t nr_confs,
+ void __iomem *clk_base)
+{
+ unsigned int i;
+ struct clk *clk = NULL;
+
+ for (i = 0; i < nr_confs; i++) {
+ const struct clk_conf *clk_conf = &clk_confs[i];
+
+ switch (clk_conf->clk_type) {
+ case CLK_FIXED_RATE:
+ clk = meson_clk_register_fixed_rate(clk_conf,
+ clk_base);
+ break;
+ case CLK_FIXED_FACTOR:
+ clk = meson_clk_register_fixed_factor(clk_conf,
+ clk_base);
+ break;
+ case CLK_COMPOSITE:
+ clk = meson_clk_register_composite(clk_conf,
+ clk_base);
+ break;
+ case CLK_CPU:
+ clk = meson_clk_register_cpu(clk_conf, clk_base,
+ &clk_lock);
+ break;
+ case CLK_PLL:
+ clk = meson_clk_register_pll(clk_conf, clk_base,
+ &clk_lock);
+ break;
+ default:
+ clk = NULL;
+ }
+
+ if (!clk) {
+ pr_err("%s: unknown clock type %d\n", __func__,
+ clk_conf->clk_type);
+ continue;
+ }
+
+ if (IS_ERR(clk)) {
+ pr_warn("%s: Unable to create %s clock\n", __func__,
+ clk_conf->clk_name);
+ continue;
+ }
+
+ meson_clk_add_lookup(clk, clk_conf->clk_id);
+ }
+}
diff --git a/drivers/clk/meson/clkc.h b/drivers/clk/meson/clkc.h
new file mode 100644
index 0000000..609ae92
--- /dev/null
+++ b/drivers/clk/meson/clkc.h
@@ -0,0 +1,187 @@
+/*
+ * Copyright (c) 2015 Endless Mobile, Inc.
+ * Author: Carlo Caione <carlo at endlessm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __CLKC_H
+#define __CLKC_H
+
+#define PMASK(width) GENMASK(width - 1, 0)
+#define SETPMASK(width, shift) GENMASK(shift + width - 1, shift)
+#define CLRPMASK(width, shift) (~SETPMASK(width, shift))
+
+#define PARM_GET(width, shift, reg) \
+ (((reg) & SETPMASK(width, shift)) >> (shift))
+#define PARM_SET(width, shift, reg, val) \
+ (((reg) & CLRPMASK(width, shift)) | (val << (shift)))
+
+#define MESON_PARM_APPLICABLE(p) (!!((p)->width))
+
+struct parm {
+ u16 reg_off;
+ u8 shift;
+ u8 width;
+};
+#define PARM(_r, _s, _w) \
+ { \
+ .reg_off = (_r), \
+ .shift = (_s), \
+ .width = (_w), \
+ } \
+
+struct pll_rate_table {
+ unsigned long rate;
+ u16 m;
+ u16 n;
+ u16 od;
+};
+#define PLL_RATE(_r, _m, _n, _od) \
+ { \
+ .rate = (_r), \
+ .m = (_m), \
+ .n = (_n), \
+ .od = (_od), \
+ } \
+
+struct pll_conf {
+ const struct pll_rate_table *rate_table;
+ struct parm m;
+ struct parm n;
+ struct parm od;
+};
+
+struct fixed_fact_conf {
+ unsigned int div;
+ unsigned int mult;
+ struct parm div_parm;
+ struct parm mult_parm;
+};
+
+struct fixed_rate_conf {
+ unsigned long rate;
+ struct parm rate_parm;
+};
+
+struct composite_conf {
+ struct parm mux_parm;
+ struct parm div_parm;
+ struct parm gate_parm;
+ struct clk_div_table *div_table;
+ u32 *mux_table;
+ u8 mux_flags;
+ u8 div_flags;
+ u8 gate_flags;
+};
+
+#define PNAME(x) static const char *x[]
+
+enum clk_type {
+ CLK_FIXED_FACTOR,
+ CLK_FIXED_RATE,
+ CLK_COMPOSITE,
+ CLK_CPU,
+ CLK_PLL,
+};
+
+struct clk_conf {
+ u16 reg_off;
+ enum clk_type clk_type;
+ unsigned int clk_id;
+ const char *clk_name;
+ const char **clks_parent;
+ int num_parents;
+ unsigned long flags;
+ union {
+ struct fixed_fact_conf fixed_fact;
+ struct fixed_rate_conf fixed_rate;
+ const struct composite_conf *composite;
+ struct pll_conf *pll;
+ const struct clk_div_table *div_table;
+ } conf;
+};
+
+#define FIXED_RATE_P(_ro, _ci, _cn, _f, _c) \
+ { \
+ .reg_off = (_ro), \
+ .clk_type = CLK_FIXED_RATE, \
+ .clk_id = (_ci), \
+ .clk_name = (_cn), \
+ .flags = (_f), \
+ .conf.fixed_rate.rate_parm = _c, \
+ } \
+
+#define FIXED_RATE(_ci, _cn, _f, _r) \
+ { \
+ .clk_type = CLK_FIXED_RATE, \
+ .clk_id = (_ci), \
+ .clk_name = (_cn), \
+ .flags = (_f), \
+ .conf.fixed_rate.rate = (_r), \
+ } \
+
+#define PLL(_ro, _ci, _cn, _cp, _f, _c) \
+ { \
+ .reg_off = (_ro), \
+ .clk_type = CLK_PLL, \
+ .clk_id = (_ci), \
+ .clk_name = (_cn), \
+ .clks_parent = (_cp), \
+ .num_parents = ARRAY_SIZE(_cp), \
+ .flags = (_f), \
+ .conf.pll = (_c), \
+ } \
+
+#define FIXED_FACTOR_DIV(_ci, _cn, _cp, _f, _d) \
+ { \
+ .clk_type = CLK_FIXED_FACTOR, \
+ .clk_id = (_ci), \
+ .clk_name = (_cn), \
+ .clks_parent = (_cp), \
+ .num_parents = ARRAY_SIZE(_cp), \
+ .conf.fixed_fact.div = (_d), \
+ } \
+
+#define CPU(_ro, _ci, _cn, _cp, _dt) \
+ { \
+ .reg_off = (_ro), \
+ .clk_type = CLK_CPU, \
+ .clk_id = (_ci), \
+ .clk_name = (_cn), \
+ .clks_parent = (_cp), \
+ .num_parents = ARRAY_SIZE(_cp), \
+ .conf.div_table = (_dt), \
+ } \
+
+#define COMPOSITE(_ro, _ci, _cn, _cp, _f, _c) \
+ { \
+ .reg_off = (_ro), \
+ .clk_type = CLK_COMPOSITE, \
+ .clk_id = (_ci), \
+ .clk_name = (_cn), \
+ .clks_parent = (_cp), \
+ .num_parents = ARRAY_SIZE(_cp), \
+ .flags = (_f), \
+ .conf.composite = (_c), \
+ } \
+
+struct clk **meson_clk_init(struct device_node *np, unsigned long nr_clks);
+void meson_clk_register_clks(const struct clk_conf *clk_confs,
+ unsigned int nr_confs, void __iomem *clk_base);
+struct clk *meson_clk_register_cpu(const struct clk_conf *clk_conf,
+ void __iomem *reg_base, spinlock_t *lock);
+struct clk *meson_clk_register_pll(const struct clk_conf *clk_conf,
+ void __iomem *reg_base, spinlock_t *lock);
+
+#endif /* __CLKC_H */
diff --git a/include/dt-bindings/clock/meson8b-clkc.h b/include/dt-bindings/clock/meson8b-clkc.h
new file mode 100644
index 0000000..bd2720d
--- /dev/null
+++ b/include/dt-bindings/clock/meson8b-clkc.h
@@ -0,0 +1,25 @@
+/*
+ * Meson8b clock tree IDs
+ */
+
+#ifndef __MESON8B_CLKC_H
+#define __MESON8B_CLKC_H
+
+#define CLKID_UNUSED 0
+#define CLKID_XTAL 1
+#define CLKID_PLL_FIXED 2
+#define CLKID_PLL_VID 3
+#define CLKID_PLL_SYS 4
+#define CLKID_FCLK_DIV2 5
+#define CLKID_FCLK_DIV3 6
+#define CLKID_FCLK_DIV4 7
+#define CLKID_FCLK_DIV5 8
+#define CLKID_FCLK_DIV7 9
+#define CLKID_CLK81 10
+#define CLKID_MALI 11
+#define CLKID_CPUCLK 12
+#define CLKID_ZERO 13
+
+#define CLK_NR_CLKS (CLKID_ZERO + 1)
+
+#endif /* __MESON8B_CLKC_H */
--
1.9.1
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