--- /dev/null
+From 3c8dd9d0937a19f3f20f28ba0b0b64f448d50dd4 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
+Date: Thu, 25 Feb 2021 19:54:04 +0100
+Subject: [PATCH 4/4] clk: bcm: Add BCM63268 timer clock and reset driver
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Add driver for BCM63268 timer clock and reset controller.
+
+Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
+---
+ drivers/clk/bcm/Kconfig | 9 ++
+ drivers/clk/bcm/Makefile | 1 +
+ drivers/clk/bcm/clk-bcm63268-timer.c | 232 +++++++++++++++++++++++++++
+ 3 files changed, 242 insertions(+)
+ create mode 100644 drivers/clk/bcm/clk-bcm63268-timer.c
+
+--- a/drivers/clk/bcm/Kconfig
++++ b/drivers/clk/bcm/Kconfig
+@@ -37,6 +37,15 @@ config CLK_BCM_63XX_GATE
+ Enable common clock framework support for Broadcom BCM63xx DSL SoCs
+ based on the MIPS architecture
+
++config CLK_BCM63268_TIMER
++ bool "Broadcom BCM63268 timer clock and reset support"
++ depends on BMIPS_GENERIC || COMPILE_TEST
++ default BMIPS_GENERIC
++ select RESET_CONTROLLER
++ help
++ Enable timer clock and reset support for Broadcom BCM63268 DSL SoCs
++ based on the MIPS architecture.
++
+ config CLK_BCM_KONA
+ bool "Broadcom Kona CCU clock support"
+ depends on ARCH_BCM_MOBILE || COMPILE_TEST
+--- a/drivers/clk/bcm/Makefile
++++ b/drivers/clk/bcm/Makefile
+@@ -1,6 +1,7 @@
+ # SPDX-License-Identifier: GPL-2.0
+ obj-$(CONFIG_CLK_BCM_63XX) += clk-bcm63xx.o
+ obj-$(CONFIG_CLK_BCM_63XX_GATE) += clk-bcm63xx-gate.o
++obj-$(CONFIG_CLK_BCM63268_TIMER) += clk-bcm63268-timer.o
+ obj-$(CONFIG_CLK_BCM_KONA) += clk-kona.o
+ obj-$(CONFIG_CLK_BCM_KONA) += clk-kona-setup.o
+ obj-$(CONFIG_CLK_BCM_KONA) += clk-bcm281xx.o
+--- /dev/null
++++ b/drivers/clk/bcm/clk-bcm63268-timer.c
+@@ -0,0 +1,232 @@
++// SPDX-License-Identifier: GPL-2.0
++/*
++ * BCM63268 Timer Clock and Reset Controller Driver
++ *
++ * Copyright (C) 2021 Álvaro Fernández Rojas <noltari@gmail.com>
++ */
++
++#include <linux/clk-provider.h>
++#include <linux/delay.h>
++#include <linux/init.h>
++#include <linux/of.h>
++#include <linux/of_device.h>
++#include <linux/platform_device.h>
++#include <linux/reset-controller.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;
++ unsigned long flags;
++};
++
++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 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, *table;
++ struct bcm63268_tclkrst_hw *hw;
++ u8 maxbit = 0;
++ int i, ret;
++
++ table = of_device_get_match_data(dev);
++ if (!table)
++ return -EINVAL;
++
++ for (entry = table; entry->name; entry++)
++ maxbit = max_t(u8, 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 = table; entry->name; entry++) {
++ struct clk_hw *clk;
++
++ clk = clk_hw_register_gate(dev, entry->name, NULL,
++ entry->flags, hw->regs, entry->bit,
++ CLK_GATE_BIG_ENDIAN, &hw->lock);
++ if (IS_ERR(clk)) {
++ ret = PTR_ERR(clk);
++ goto out_err;
++ }
++
++ hw->data.hws[entry->bit] = clk;
++ }
++
++ ret = of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
++ &hw->data);
++ if (!ret)
++ return 0;
++
++ 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");
++
++out_err:
++ for (i = 0; i < hw->data.num; i++) {
++ if (!IS_ERR(hw->data.hws[i]))
++ clk_hw_unregister_gate(hw->data.hws[i]);
++ }
++
++ return ret;
++}
++
++static const struct of_device_id bcm63268_tclk_dt_ids[] = {
++ {
++ .compatible = "brcm,bcm63268-timer-clocks",
++ .data = &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);
projects / openwrt / staging / noltari.git / commitdiff