summaryrefslogtreecommitdiffstats
path: root/drivers/clk/bcm/clk-bcm63268-timer.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/clk/bcm/clk-bcm63268-timer.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/clk/bcm/clk-bcm63268-timer.c')
-rw-r--r--drivers/clk/bcm/clk-bcm63268-timer.c216
1 files changed, 216 insertions, 0 deletions
diff --git a/drivers/clk/bcm/clk-bcm63268-timer.c b/drivers/clk/bcm/clk-bcm63268-timer.c
new file mode 100644
index 0000000000..463710d272
--- /dev/null
+++ b/drivers/clk/bcm/clk-bcm63268-timer.c
@@ -0,0 +1,216 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * BCM63268 Timer Clock and Reset Controller Driver
+ *
+ * Copyright (C) 2023 Álvaro Fernández Rojas <noltari@gmail.com>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/container_of.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+#include <linux/spinlock.h>
+
+#include <dt-bindings/clock/bcm63268-clock.h>
+
+#define BCM63268_TIMER_RESET_SLEEP_MIN_US 10000
+#define BCM63268_TIMER_RESET_SLEEP_MAX_US 20000
+
+struct bcm63268_tclkrst_hw {
+ void __iomem *regs;
+ spinlock_t lock;
+
+ struct reset_controller_dev rcdev;
+ struct clk_hw_onecell_data data;
+};
+
+struct bcm63268_tclk_table_entry {
+ const char * const name;
+ u8 bit;
+};
+
+static const struct bcm63268_tclk_table_entry bcm63268_timer_clocks[] = {
+ {
+ .name = "ephy1",
+ .bit = BCM63268_TCLK_EPHY1,
+ }, {
+ .name = "ephy2",
+ .bit = BCM63268_TCLK_EPHY2,
+ }, {
+ .name = "ephy3",
+ .bit = BCM63268_TCLK_EPHY3,
+ }, {
+ .name = "gphy1",
+ .bit = BCM63268_TCLK_GPHY1,
+ }, {
+ .name = "dsl",
+ .bit = BCM63268_TCLK_DSL,
+ }, {
+ .name = "wakeon_ephy",
+ .bit = BCM63268_TCLK_WAKEON_EPHY,
+ }, {
+ .name = "wakeon_dsl",
+ .bit = BCM63268_TCLK_WAKEON_DSL,
+ }, {
+ .name = "fap1_pll",
+ .bit = BCM63268_TCLK_FAP1,
+ }, {
+ .name = "fap2_pll",
+ .bit = BCM63268_TCLK_FAP2,
+ }, {
+ .name = "uto_50",
+ .bit = BCM63268_TCLK_UTO_50,
+ }, {
+ .name = "uto_extin",
+ .bit = BCM63268_TCLK_UTO_EXTIN,
+ }, {
+ .name = "usb_ref",
+ .bit = BCM63268_TCLK_USB_REF,
+ }, {
+ /* sentinel */
+ }
+};
+
+static inline struct bcm63268_tclkrst_hw *
+to_bcm63268_timer_reset(struct reset_controller_dev *rcdev)
+{
+ return container_of(rcdev, struct bcm63268_tclkrst_hw, rcdev);
+}
+
+static int bcm63268_timer_reset_update(struct reset_controller_dev *rcdev,
+ unsigned long id, bool assert)
+{
+ struct bcm63268_tclkrst_hw *reset = to_bcm63268_timer_reset(rcdev);
+ unsigned long flags;
+ uint32_t val;
+
+ spin_lock_irqsave(&reset->lock, flags);
+ val = __raw_readl(reset->regs);
+ if (assert)
+ val &= ~BIT(id);
+ else
+ val |= BIT(id);
+ __raw_writel(val, reset->regs);
+ spin_unlock_irqrestore(&reset->lock, flags);
+
+ return 0;
+}
+
+static int bcm63268_timer_reset_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ return bcm63268_timer_reset_update(rcdev, id, true);
+}
+
+static int bcm63268_timer_reset_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ return bcm63268_timer_reset_update(rcdev, id, false);
+}
+
+static int bcm63268_timer_reset_reset(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ bcm63268_timer_reset_update(rcdev, id, true);
+ usleep_range(BCM63268_TIMER_RESET_SLEEP_MIN_US,
+ BCM63268_TIMER_RESET_SLEEP_MAX_US);
+
+ bcm63268_timer_reset_update(rcdev, id, false);
+ /*
+ * Ensure component is taken out reset state by sleeping also after
+ * deasserting the reset. Otherwise, the component may not be ready
+ * for operation.
+ */
+ usleep_range(BCM63268_TIMER_RESET_SLEEP_MIN_US,
+ BCM63268_TIMER_RESET_SLEEP_MAX_US);
+
+ return 0;
+}
+
+static int bcm63268_timer_reset_status(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct bcm63268_tclkrst_hw *reset = to_bcm63268_timer_reset(rcdev);
+
+ return !(__raw_readl(reset->regs) & BIT(id));
+}
+
+static const struct reset_control_ops bcm63268_timer_reset_ops = {
+ .assert = bcm63268_timer_reset_assert,
+ .deassert = bcm63268_timer_reset_deassert,
+ .reset = bcm63268_timer_reset_reset,
+ .status = bcm63268_timer_reset_status,
+};
+
+static int bcm63268_tclk_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ const struct bcm63268_tclk_table_entry *entry;
+ struct bcm63268_tclkrst_hw *hw;
+ struct clk_hw *clk;
+ u8 maxbit = 0;
+ int i, ret;
+
+ for (entry = bcm63268_timer_clocks; entry->name; entry++)
+ maxbit = max(maxbit, entry->bit);
+ maxbit++;
+
+ hw = devm_kzalloc(&pdev->dev, struct_size(hw, data.hws, maxbit),
+ GFP_KERNEL);
+ if (!hw)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, hw);
+
+ spin_lock_init(&hw->lock);
+
+ hw->data.num = maxbit;
+ for (i = 0; i < maxbit; i++)
+ hw->data.hws[i] = ERR_PTR(-ENODEV);
+
+ hw->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(hw->regs))
+ return PTR_ERR(hw->regs);
+
+ for (entry = bcm63268_timer_clocks; entry->name; entry++) {
+ clk = devm_clk_hw_register_gate(dev, entry->name, NULL, 0,
+ hw->regs, entry->bit,
+ CLK_GATE_BIG_ENDIAN,
+ &hw->lock);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ hw->data.hws[entry->bit] = clk;
+ }
+
+ ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
+ &hw->data);
+ if (ret)
+ return ret;
+
+ hw->rcdev.of_node = dev->of_node;
+ hw->rcdev.ops = &bcm63268_timer_reset_ops;
+
+ ret = devm_reset_controller_register(dev, &hw->rcdev);
+ if (ret)
+ dev_err(dev, "Failed to register reset controller\n");
+
+ return 0;
+}
+
+static const struct of_device_id bcm63268_tclk_dt_ids[] = {
+ { .compatible = "brcm,bcm63268-timer-clocks" },
+ { /* sentinel */ }
+};
+
+static struct platform_driver bcm63268_tclk = {
+ .probe = bcm63268_tclk_probe,
+ .driver = {
+ .name = "bcm63268-timer-clock",
+ .of_match_table = bcm63268_tclk_dt_ids,
+ },
+};
+builtin_platform_driver(bcm63268_tclk);