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-rw-r--r--drivers/clk/imx/clk-composite-93.c254
1 files changed, 254 insertions, 0 deletions
diff --git a/drivers/clk/imx/clk-composite-93.c b/drivers/clk/imx/clk-composite-93.c
new file mode 100644
index 000000000..74a66b020
--- /dev/null
+++ b/drivers/clk/imx/clk-composite-93.c
@@ -0,0 +1,254 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2021 NXP
+ *
+ * Peng Fan <peng.fan@nxp.com>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/slab.h>
+
+#include "clk.h"
+
+#define TIMEOUT_US 500U
+
+#define CCM_DIV_SHIFT 0
+#define CCM_DIV_WIDTH 8
+#define CCM_MUX_SHIFT 8
+#define CCM_MUX_MASK 3
+#define CCM_OFF_SHIFT 24
+#define CCM_BUSY_SHIFT 28
+
+#define STAT_OFFSET 0x4
+#define AUTHEN_OFFSET 0x30
+#define TZ_NS_SHIFT 9
+#define TZ_NS_MASK BIT(9)
+
+#define WHITE_LIST_SHIFT 16
+
+static int imx93_clk_composite_wait_ready(struct clk_hw *hw, void __iomem *reg)
+{
+ int ret;
+ u32 val;
+
+ ret = readl_poll_timeout_atomic(reg + STAT_OFFSET, val, !(val & BIT(CCM_BUSY_SHIFT)),
+ 0, TIMEOUT_US);
+ if (ret)
+ pr_err("Slice[%s] busy timeout\n", clk_hw_get_name(hw));
+
+ return ret;
+}
+
+static void imx93_clk_composite_gate_endisable(struct clk_hw *hw, int enable)
+{
+ struct clk_gate *gate = to_clk_gate(hw);
+ unsigned long flags;
+ u32 reg;
+
+ if (gate->lock)
+ spin_lock_irqsave(gate->lock, flags);
+
+ reg = readl(gate->reg);
+
+ if (enable)
+ reg &= ~BIT(gate->bit_idx);
+ else
+ reg |= BIT(gate->bit_idx);
+
+ writel(reg, gate->reg);
+
+ imx93_clk_composite_wait_ready(hw, gate->reg);
+
+ if (gate->lock)
+ spin_unlock_irqrestore(gate->lock, flags);
+}
+
+static int imx93_clk_composite_gate_enable(struct clk_hw *hw)
+{
+ imx93_clk_composite_gate_endisable(hw, 1);
+
+ return 0;
+}
+
+static void imx93_clk_composite_gate_disable(struct clk_hw *hw)
+{
+ imx93_clk_composite_gate_endisable(hw, 0);
+}
+
+static const struct clk_ops imx93_clk_composite_gate_ops = {
+ .enable = imx93_clk_composite_gate_enable,
+ .disable = imx93_clk_composite_gate_disable,
+ .is_enabled = clk_gate_is_enabled,
+};
+
+static unsigned long
+imx93_clk_composite_divider_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
+{
+ return clk_divider_ops.recalc_rate(hw, parent_rate);
+}
+
+static long
+imx93_clk_composite_divider_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *prate)
+{
+ return clk_divider_ops.round_rate(hw, rate, prate);
+}
+
+static int
+imx93_clk_composite_divider_determine_rate(struct clk_hw *hw, struct clk_rate_request *req)
+{
+ return clk_divider_ops.determine_rate(hw, req);
+}
+
+static int imx93_clk_composite_divider_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_divider *divider = to_clk_divider(hw);
+ int value;
+ unsigned long flags = 0;
+ u32 val;
+ int ret;
+
+ value = divider_get_val(rate, parent_rate, divider->table, divider->width, divider->flags);
+ if (value < 0)
+ return value;
+
+ if (divider->lock)
+ spin_lock_irqsave(divider->lock, flags);
+
+ val = readl(divider->reg);
+ val &= ~(clk_div_mask(divider->width) << divider->shift);
+ val |= (u32)value << divider->shift;
+ writel(val, divider->reg);
+
+ ret = imx93_clk_composite_wait_ready(hw, divider->reg);
+
+ if (divider->lock)
+ spin_unlock_irqrestore(divider->lock, flags);
+
+ return ret;
+}
+
+static const struct clk_ops imx93_clk_composite_divider_ops = {
+ .recalc_rate = imx93_clk_composite_divider_recalc_rate,
+ .round_rate = imx93_clk_composite_divider_round_rate,
+ .determine_rate = imx93_clk_composite_divider_determine_rate,
+ .set_rate = imx93_clk_composite_divider_set_rate,
+};
+
+static u8 imx93_clk_composite_mux_get_parent(struct clk_hw *hw)
+{
+ return clk_mux_ops.get_parent(hw);
+}
+
+static int imx93_clk_composite_mux_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct clk_mux *mux = to_clk_mux(hw);
+ u32 val = clk_mux_index_to_val(mux->table, mux->flags, index);
+ unsigned long flags = 0;
+ u32 reg;
+ int ret;
+
+ if (mux->lock)
+ spin_lock_irqsave(mux->lock, flags);
+
+ reg = readl(mux->reg);
+ reg &= ~(mux->mask << mux->shift);
+ val = val << mux->shift;
+ reg |= val;
+ writel(reg, mux->reg);
+
+ ret = imx93_clk_composite_wait_ready(hw, mux->reg);
+
+ if (mux->lock)
+ spin_unlock_irqrestore(mux->lock, flags);
+
+ return ret;
+}
+
+static int
+imx93_clk_composite_mux_determine_rate(struct clk_hw *hw, struct clk_rate_request *req)
+{
+ return clk_mux_ops.determine_rate(hw, req);
+}
+
+static const struct clk_ops imx93_clk_composite_mux_ops = {
+ .get_parent = imx93_clk_composite_mux_get_parent,
+ .set_parent = imx93_clk_composite_mux_set_parent,
+ .determine_rate = imx93_clk_composite_mux_determine_rate,
+};
+
+struct clk_hw *imx93_clk_composite_flags(const char *name, const char * const *parent_names,
+ int num_parents, void __iomem *reg, u32 domain_id,
+ unsigned long flags)
+{
+ struct clk_hw *hw = ERR_PTR(-ENOMEM), *mux_hw;
+ struct clk_hw *div_hw, *gate_hw;
+ struct clk_divider *div = NULL;
+ struct clk_gate *gate = NULL;
+ struct clk_mux *mux = NULL;
+ bool clk_ro = false;
+ u32 authen;
+
+ mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+ if (!mux)
+ goto fail;
+
+ mux_hw = &mux->hw;
+ mux->reg = reg;
+ mux->shift = CCM_MUX_SHIFT;
+ mux->mask = CCM_MUX_MASK;
+ mux->lock = &imx_ccm_lock;
+
+ div = kzalloc(sizeof(*div), GFP_KERNEL);
+ if (!div)
+ goto fail;
+
+ div_hw = &div->hw;
+ div->reg = reg;
+ div->shift = CCM_DIV_SHIFT;
+ div->width = CCM_DIV_WIDTH;
+ div->lock = &imx_ccm_lock;
+ div->flags = CLK_DIVIDER_ROUND_CLOSEST;
+
+ authen = readl(reg + AUTHEN_OFFSET);
+ if (!(authen & TZ_NS_MASK) || !(authen & BIT(WHITE_LIST_SHIFT + domain_id)))
+ clk_ro = true;
+
+ if (clk_ro) {
+ hw = clk_hw_register_composite(NULL, name, parent_names, num_parents,
+ mux_hw, &clk_mux_ro_ops, div_hw,
+ &clk_divider_ro_ops, NULL, NULL, flags);
+ } else {
+ gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+ if (!gate)
+ goto fail;
+
+ gate_hw = &gate->hw;
+ gate->reg = reg;
+ gate->bit_idx = CCM_OFF_SHIFT;
+ gate->lock = &imx_ccm_lock;
+ gate->flags = CLK_GATE_SET_TO_DISABLE;
+
+ hw = clk_hw_register_composite(NULL, name, parent_names, num_parents,
+ mux_hw, &imx93_clk_composite_mux_ops, div_hw,
+ &imx93_clk_composite_divider_ops, gate_hw,
+ &imx93_clk_composite_gate_ops,
+ flags | CLK_SET_RATE_NO_REPARENT);
+ }
+
+ if (IS_ERR(hw))
+ goto fail;
+
+ return hw;
+
+fail:
+ kfree(gate);
+ kfree(div);
+ kfree(mux);
+ return ERR_CAST(hw);
+}
+EXPORT_SYMBOL_GPL(imx93_clk_composite_flags);
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-31 18:27:53 +0000