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-rw-r--r--drivers/clk/microchip/Kconfig11
-rw-r--r--drivers/clk/microchip/Makefile2
-rw-r--r--drivers/clk/microchip/clk-mpfs-ccc.c290
-rw-r--r--drivers/clk/microchip/clk-mpfs.c516
4 files changed, 819 insertions, 0 deletions
diff --git a/drivers/clk/microchip/Kconfig b/drivers/clk/microchip/Kconfig
new file mode 100644
index 000000000000..b46e864b3bd8
--- /dev/null
+++ b/drivers/clk/microchip/Kconfig
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config COMMON_CLK_PIC32
+ def_bool COMMON_CLK && MACH_PIC32
+
+config MCHP_CLK_MPFS
+ bool "Clk driver for PolarFire SoC"
+ depends on (RISCV && SOC_MICROCHIP_POLARFIRE) || COMPILE_TEST
+ select AUXILIARY_BUS
+ help
+ Supports Clock Configuration for PolarFire SoC
diff --git a/drivers/clk/microchip/Makefile b/drivers/clk/microchip/Makefile
index f34b247e870f..13250e04e46c 100644
--- a/drivers/clk/microchip/Makefile
+++ b/drivers/clk/microchip/Makefile
@@ -1,3 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_COMMON_CLK_PIC32) += clk-core.o
obj-$(CONFIG_PIC32MZDA) += clk-pic32mzda.o
+obj-$(CONFIG_MCHP_CLK_MPFS) += clk-mpfs.o
+obj-$(CONFIG_MCHP_CLK_MPFS) += clk-mpfs-ccc.o
diff --git a/drivers/clk/microchip/clk-mpfs-ccc.c b/drivers/clk/microchip/clk-mpfs-ccc.c
new file mode 100644
index 000000000000..7be028dced63
--- /dev/null
+++ b/drivers/clk/microchip/clk-mpfs-ccc.c
@@ -0,0 +1,290 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Author: Conor Dooley <conor.dooley@microchip.com>
+ *
+ * Copyright (C) 2022 Microchip Technology Inc. and its subsidiaries
+ */
+#include "asm-generic/errno-base.h"
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <dt-bindings/clock/microchip,mpfs-clock.h>
+
+/* address offset of control registers */
+#define MPFS_CCC_PLL_CR 0x04u
+#define MPFS_CCC_REF_CR 0x08u
+#define MPFS_CCC_SSCG_2_CR 0x2Cu
+#define MPFS_CCC_POSTDIV01_CR 0x10u
+#define MPFS_CCC_POSTDIV23_CR 0x14u
+
+#define MPFS_CCC_FBDIV_SHIFT 0x00u
+#define MPFS_CCC_FBDIV_WIDTH 0x0Cu
+#define MPFS_CCC_POSTDIV0_SHIFT 0x08u
+#define MPFS_CCC_POSTDIV1_SHIFT 0x18u
+#define MPFS_CCC_POSTDIV2_SHIFT MPFS_CCC_POSTDIV0_SHIFT
+#define MPFS_CCC_POSTDIV3_SHIFT MPFS_CCC_POSTDIV1_SHIFT
+#define MPFS_CCC_POSTDIV_WIDTH 0x06u
+#define MPFS_CCC_REFCLK_SEL BIT(6)
+#define MPFS_CCC_REFDIV_SHIFT 0x08u
+#define MPFS_CCC_REFDIV_WIDTH 0x06u
+
+#define MPFS_CCC_FIXED_DIV 4
+#define MPFS_CCC_OUTPUTS_PER_PLL 4
+#define MPFS_CCC_REFS_PER_PLL 2
+
+struct mpfs_ccc_data {
+ void __iomem **pll_base;
+ struct device *dev;
+ struct clk_hw_onecell_data hw_data;
+};
+
+struct mpfs_ccc_pll_hw_clock {
+ void __iomem *base;
+ const char *name;
+ const struct clk_parent_data *parents;
+ unsigned int id;
+ u32 reg_offset;
+ u32 shift;
+ u32 width;
+ u32 flags;
+ struct clk_hw hw;
+ struct clk_init_data init;
+};
+
+#define to_mpfs_ccc_clk(_hw) container_of(_hw, struct mpfs_ccc_pll_hw_clock, hw)
+
+/*
+ * mpfs_ccc_lock prevents anything else from writing to a fabric ccc
+ * while a software locked register is being written.
+ */
+static DEFINE_SPINLOCK(mpfs_ccc_lock);
+
+static const struct clk_parent_data mpfs_ccc_pll0_refs[] = {
+ { .fw_name = "pll0_ref0" },
+ { .fw_name = "pll0_ref1" },
+};
+
+static const struct clk_parent_data mpfs_ccc_pll1_refs[] = {
+ { .fw_name = "pll1_ref0" },
+ { .fw_name = "pll1_ref1" },
+};
+
+static unsigned long mpfs_ccc_pll_recalc_rate(struct clk_hw *hw, unsigned long prate)
+{
+ struct mpfs_ccc_pll_hw_clock *ccc_hw = to_mpfs_ccc_clk(hw);
+ void __iomem *mult_addr = ccc_hw->base + ccc_hw->reg_offset;
+ void __iomem *ref_div_addr = ccc_hw->base + MPFS_CCC_REF_CR;
+ u32 mult, ref_div;
+
+ mult = readl_relaxed(mult_addr) >> MPFS_CCC_FBDIV_SHIFT;
+ mult &= clk_div_mask(MPFS_CCC_FBDIV_WIDTH);
+ ref_div = readl_relaxed(ref_div_addr) >> MPFS_CCC_REFDIV_SHIFT;
+ ref_div &= clk_div_mask(MPFS_CCC_REFDIV_WIDTH);
+
+ return prate * mult / (ref_div * MPFS_CCC_FIXED_DIV);
+}
+
+static u8 mpfs_ccc_pll_get_parent(struct clk_hw *hw)
+{
+ struct mpfs_ccc_pll_hw_clock *ccc_hw = to_mpfs_ccc_clk(hw);
+ void __iomem *pll_cr_addr = ccc_hw->base + MPFS_CCC_PLL_CR;
+
+ return !!(readl_relaxed(pll_cr_addr) & MPFS_CCC_REFCLK_SEL);
+}
+
+static const struct clk_ops mpfs_ccc_pll_ops = {
+ .recalc_rate = mpfs_ccc_pll_recalc_rate,
+ .get_parent = mpfs_ccc_pll_get_parent,
+};
+
+#define CLK_CCC_PLL(_id, _parents, _shift, _width, _flags, _offset) { \
+ .id = _id, \
+ .shift = _shift, \
+ .width = _width, \
+ .reg_offset = _offset, \
+ .flags = _flags, \
+ .parents = _parents, \
+}
+
+static struct mpfs_ccc_pll_hw_clock mpfs_ccc_pll_clks[] = {
+ CLK_CCC_PLL(CLK_CCC_PLL0, mpfs_ccc_pll0_refs, MPFS_CCC_FBDIV_SHIFT,
+ MPFS_CCC_FBDIV_WIDTH, 0, MPFS_CCC_SSCG_2_CR),
+ CLK_CCC_PLL(CLK_CCC_PLL1, mpfs_ccc_pll1_refs, MPFS_CCC_FBDIV_SHIFT,
+ MPFS_CCC_FBDIV_WIDTH, 0, MPFS_CCC_SSCG_2_CR),
+};
+
+struct mpfs_ccc_out_hw_clock {
+ struct clk_divider divider;
+ struct clk_init_data init;
+ unsigned int id;
+ u32 reg_offset;
+};
+
+#define CLK_CCC_OUT(_id, _shift, _width, _flags, _offset) { \
+ .id = _id, \
+ .divider.shift = _shift, \
+ .divider.width = _width, \
+ .reg_offset = _offset, \
+ .divider.flags = _flags, \
+ .divider.lock = &mpfs_ccc_lock, \
+}
+
+static struct mpfs_ccc_out_hw_clock mpfs_ccc_pll0out_clks[] = {
+ CLK_CCC_OUT(CLK_CCC_PLL0_OUT0, MPFS_CCC_POSTDIV0_SHIFT, MPFS_CCC_POSTDIV_WIDTH,
+ CLK_DIVIDER_ONE_BASED, MPFS_CCC_POSTDIV01_CR),
+ CLK_CCC_OUT(CLK_CCC_PLL0_OUT1, MPFS_CCC_POSTDIV1_SHIFT, MPFS_CCC_POSTDIV_WIDTH,
+ CLK_DIVIDER_ONE_BASED, MPFS_CCC_POSTDIV01_CR),
+ CLK_CCC_OUT(CLK_CCC_PLL0_OUT2, MPFS_CCC_POSTDIV2_SHIFT, MPFS_CCC_POSTDIV_WIDTH,
+ CLK_DIVIDER_ONE_BASED, MPFS_CCC_POSTDIV23_CR),
+ CLK_CCC_OUT(CLK_CCC_PLL0_OUT3, MPFS_CCC_POSTDIV3_SHIFT, MPFS_CCC_POSTDIV_WIDTH,
+ CLK_DIVIDER_ONE_BASED, MPFS_CCC_POSTDIV23_CR),
+};
+
+static struct mpfs_ccc_out_hw_clock mpfs_ccc_pll1out_clks[] = {
+ CLK_CCC_OUT(CLK_CCC_PLL1_OUT0, MPFS_CCC_POSTDIV0_SHIFT, MPFS_CCC_POSTDIV_WIDTH,
+ CLK_DIVIDER_ONE_BASED, MPFS_CCC_POSTDIV01_CR),
+ CLK_CCC_OUT(CLK_CCC_PLL1_OUT1, MPFS_CCC_POSTDIV1_SHIFT, MPFS_CCC_POSTDIV_WIDTH,
+ CLK_DIVIDER_ONE_BASED, MPFS_CCC_POSTDIV01_CR),
+ CLK_CCC_OUT(CLK_CCC_PLL1_OUT2, MPFS_CCC_POSTDIV2_SHIFT, MPFS_CCC_POSTDIV_WIDTH,
+ CLK_DIVIDER_ONE_BASED, MPFS_CCC_POSTDIV23_CR),
+ CLK_CCC_OUT(CLK_CCC_PLL1_OUT3, MPFS_CCC_POSTDIV3_SHIFT, MPFS_CCC_POSTDIV_WIDTH,
+ CLK_DIVIDER_ONE_BASED, MPFS_CCC_POSTDIV23_CR),
+};
+
+static struct mpfs_ccc_out_hw_clock *mpfs_ccc_pllout_clks[] = {
+ mpfs_ccc_pll0out_clks, mpfs_ccc_pll1out_clks
+};
+
+static int mpfs_ccc_register_outputs(struct device *dev, struct mpfs_ccc_out_hw_clock *out_hws,
+ unsigned int num_clks, struct mpfs_ccc_data *data,
+ struct mpfs_ccc_pll_hw_clock *parent)
+{
+ int ret;
+
+ for (unsigned int i = 0; i < num_clks; i++) {
+ struct mpfs_ccc_out_hw_clock *out_hw = &out_hws[i];
+ char *name = devm_kzalloc(dev, 23, GFP_KERNEL);
+
+ snprintf(name, 23, "%s_out%u", parent->name, i);
+ out_hw->divider.hw.init = CLK_HW_INIT_HW(name, &parent->hw, &clk_divider_ops, 0);
+ out_hw->divider.reg = data->pll_base[i / MPFS_CCC_OUTPUTS_PER_PLL] +
+ out_hw->reg_offset;
+
+ ret = devm_clk_hw_register(dev, &out_hw->divider.hw);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to register clock id: %d\n",
+ out_hw->id);
+
+ data->hw_data.hws[out_hw->id] = &out_hw->divider.hw;
+ }
+
+ return 0;
+}
+
+#define CLK_HW_INIT_PARENTS_DATA_FIXED_SIZE(_name, _parents, _ops, _flags) \
+ (&(struct clk_init_data) { \
+ .flags = _flags, \
+ .name = _name, \
+ .parent_data = _parents, \
+ .num_parents = MPFS_CCC_REFS_PER_PLL, \
+ .ops = _ops, \
+ })
+
+static int mpfs_ccc_register_plls(struct device *dev, struct mpfs_ccc_pll_hw_clock *pll_hws,
+ unsigned int num_clks, struct mpfs_ccc_data *data)
+{
+ int ret;
+
+ for (unsigned int i = 0; i < num_clks; i++) {
+ struct mpfs_ccc_pll_hw_clock *pll_hw = &pll_hws[i];
+ char *name = devm_kzalloc(dev, 18, GFP_KERNEL);
+
+ pll_hw->base = data->pll_base[i];
+ snprintf(name, 18, "ccc%s_pll%u", strchrnul(dev->of_node->full_name, '@'), i);
+ pll_hw->name = (const char *)name;
+ pll_hw->hw.init = CLK_HW_INIT_PARENTS_DATA_FIXED_SIZE(pll_hw->name,
+ pll_hw->parents,
+ &mpfs_ccc_pll_ops, 0);
+
+ ret = devm_clk_hw_register(dev, &pll_hw->hw);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to register ccc id: %d\n",
+ pll_hw->id);
+
+ data->hw_data.hws[pll_hw->id] = &pll_hw->hw;
+
+ ret = mpfs_ccc_register_outputs(dev, mpfs_ccc_pllout_clks[i],
+ MPFS_CCC_OUTPUTS_PER_PLL, data, pll_hw);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int mpfs_ccc_probe(struct platform_device *pdev)
+{
+ struct mpfs_ccc_data *clk_data;
+ void __iomem *pll_base[ARRAY_SIZE(mpfs_ccc_pll_clks)];
+ unsigned int num_clks;
+ int ret;
+
+ num_clks = ARRAY_SIZE(mpfs_ccc_pll_clks) + ARRAY_SIZE(mpfs_ccc_pll0out_clks) +
+ ARRAY_SIZE(mpfs_ccc_pll1out_clks);
+
+ clk_data = devm_kzalloc(&pdev->dev, struct_size(clk_data, hw_data.hws, num_clks),
+ GFP_KERNEL);
+ if (!clk_data)
+ return -ENOMEM;
+
+ pll_base[0] = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(pll_base[0]))
+ return PTR_ERR(pll_base[0]);
+
+ pll_base[1] = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(pll_base[1]))
+ return PTR_ERR(pll_base[1]);
+
+ clk_data->pll_base = pll_base;
+ clk_data->hw_data.num = num_clks;
+ clk_data->dev = &pdev->dev;
+
+ ret = mpfs_ccc_register_plls(clk_data->dev, mpfs_ccc_pll_clks,
+ ARRAY_SIZE(mpfs_ccc_pll_clks), clk_data);
+ if (ret)
+ return ret;
+
+ return devm_of_clk_add_hw_provider(clk_data->dev, of_clk_hw_onecell_get,
+ &clk_data->hw_data);
+}
+
+static const struct of_device_id mpfs_ccc_of_match_table[] = {
+ { .compatible = "microchip,mpfs-ccc", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, mpfs_ccc_of_match_table);
+
+static struct platform_driver mpfs_ccc_driver = {
+ .probe = mpfs_ccc_probe,
+ .driver = {
+ .name = "microchip-mpfs-ccc",
+ .of_match_table = mpfs_ccc_of_match_table,
+ },
+};
+
+static int __init clk_ccc_init(void)
+{
+ return platform_driver_register(&mpfs_ccc_driver);
+}
+core_initcall(clk_ccc_init);
+
+static void __exit clk_ccc_exit(void)
+{
+ platform_driver_unregister(&mpfs_ccc_driver);
+}
+module_exit(clk_ccc_exit);
+
+MODULE_DESCRIPTION("Microchip PolarFire SoC Clock Conditioning Circuitry Driver");
+MODULE_AUTHOR("Conor Dooley <conor.dooley@microchip.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/clk/microchip/clk-mpfs.c b/drivers/clk/microchip/clk-mpfs.c
new file mode 100644
index 000000000000..4f0a19db7ed7
--- /dev/null
+++ b/drivers/clk/microchip/clk-mpfs.c
@@ -0,0 +1,516 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PolarFire SoC MSS/core complex clock control
+ *
+ * Copyright (C) 2020-2022 Microchip Technology Inc. All rights reserved.
+ */
+#include <linux/auxiliary_bus.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <dt-bindings/clock/microchip,mpfs-clock.h>
+#include <soc/microchip/mpfs.h>
+
+/* address offset of control registers */
+#define REG_MSSPLL_REF_CR 0x08u
+#define REG_MSSPLL_POSTDIV_CR 0x10u
+#define REG_MSSPLL_SSCG_2_CR 0x2Cu
+#define REG_CLOCK_CONFIG_CR 0x08u
+#define REG_RTC_CLOCK_CR 0x0Cu
+#define REG_SUBBLK_CLOCK_CR 0x84u
+#define REG_SUBBLK_RESET_CR 0x88u
+
+#define MSSPLL_FBDIV_SHIFT 0x00u
+#define MSSPLL_FBDIV_WIDTH 0x0Cu
+#define MSSPLL_REFDIV_SHIFT 0x08u
+#define MSSPLL_REFDIV_WIDTH 0x06u
+#define MSSPLL_POSTDIV_SHIFT 0x08u
+#define MSSPLL_POSTDIV_WIDTH 0x07u
+#define MSSPLL_FIXED_DIV 4u
+
+struct mpfs_clock_data {
+ struct device *dev;
+ void __iomem *base;
+ void __iomem *msspll_base;
+ struct clk_hw_onecell_data hw_data;
+};
+
+struct mpfs_msspll_hw_clock {
+ void __iomem *base;
+ unsigned int id;
+ u32 reg_offset;
+ u32 shift;
+ u32 width;
+ u32 flags;
+ struct clk_hw hw;
+ struct clk_init_data init;
+};
+
+#define to_mpfs_msspll_clk(_hw) container_of(_hw, struct mpfs_msspll_hw_clock, hw)
+
+struct mpfs_cfg_hw_clock {
+ struct clk_divider cfg;
+ struct clk_init_data init;
+ unsigned int id;
+ u32 reg_offset;
+};
+
+struct mpfs_periph_hw_clock {
+ struct clk_gate periph;
+ unsigned int id;
+};
+
+/*
+ * mpfs_clk_lock prevents anything else from writing to the
+ * mpfs clk block while a software locked register is being written.
+ */
+static DEFINE_SPINLOCK(mpfs_clk_lock);
+
+static const struct clk_parent_data mpfs_ext_ref[] = {
+ { .index = 0 },
+};
+
+static const struct clk_div_table mpfs_div_cpu_axi_table[] = {
+ { 0, 1 }, { 1, 2 }, { 2, 4 }, { 3, 8 },
+ { 0, 0 }
+};
+
+static const struct clk_div_table mpfs_div_ahb_table[] = {
+ { 1, 2 }, { 2, 4}, { 3, 8 },
+ { 0, 0 }
+};
+
+/*
+ * The only two supported reference clock frequencies for the PolarFire SoC are
+ * 100 and 125 MHz, as the rtc reference is required to be 1 MHz.
+ * It therefore only needs to have divider table entries corresponding to
+ * divide by 100 and 125.
+ */
+static const struct clk_div_table mpfs_div_rtcref_table[] = {
+ { 100, 100 }, { 125, 125 },
+ { 0, 0 }
+};
+
+static unsigned long mpfs_clk_msspll_recalc_rate(struct clk_hw *hw, unsigned long prate)
+{
+ struct mpfs_msspll_hw_clock *msspll_hw = to_mpfs_msspll_clk(hw);
+ void __iomem *mult_addr = msspll_hw->base + msspll_hw->reg_offset;
+ void __iomem *ref_div_addr = msspll_hw->base + REG_MSSPLL_REF_CR;
+ void __iomem *postdiv_addr = msspll_hw->base + REG_MSSPLL_POSTDIV_CR;
+ u32 mult, ref_div, postdiv;
+
+ mult = readl_relaxed(mult_addr) >> MSSPLL_FBDIV_SHIFT;
+ mult &= clk_div_mask(MSSPLL_FBDIV_WIDTH);
+ ref_div = readl_relaxed(ref_div_addr) >> MSSPLL_REFDIV_SHIFT;
+ ref_div &= clk_div_mask(MSSPLL_REFDIV_WIDTH);
+ postdiv = readl_relaxed(postdiv_addr) >> MSSPLL_POSTDIV_SHIFT;
+ postdiv &= clk_div_mask(MSSPLL_POSTDIV_WIDTH);
+
+ return prate * mult / (ref_div * MSSPLL_FIXED_DIV * postdiv);
+}
+
+static long mpfs_clk_msspll_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *prate)
+{
+ struct mpfs_msspll_hw_clock *msspll_hw = to_mpfs_msspll_clk(hw);
+ void __iomem *mult_addr = msspll_hw->base + msspll_hw->reg_offset;
+ void __iomem *ref_div_addr = msspll_hw->base + REG_MSSPLL_REF_CR;
+ u32 mult, ref_div;
+ unsigned long rate_before_ctrl;
+
+ mult = readl_relaxed(mult_addr) >> MSSPLL_FBDIV_SHIFT;
+ mult &= clk_div_mask(MSSPLL_FBDIV_WIDTH);
+ ref_div = readl_relaxed(ref_div_addr) >> MSSPLL_REFDIV_SHIFT;
+ ref_div &= clk_div_mask(MSSPLL_REFDIV_WIDTH);
+
+ rate_before_ctrl = rate * (ref_div * MSSPLL_FIXED_DIV) / mult;
+
+ return divider_round_rate(hw, rate_before_ctrl, prate, NULL, MSSPLL_POSTDIV_WIDTH,
+ msspll_hw->flags);
+}
+
+static int mpfs_clk_msspll_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long prate)
+{
+ struct mpfs_msspll_hw_clock *msspll_hw = to_mpfs_msspll_clk(hw);
+ void __iomem *mult_addr = msspll_hw->base + msspll_hw->reg_offset;
+ void __iomem *ref_div_addr = msspll_hw->base + REG_MSSPLL_REF_CR;
+ void __iomem *postdiv_addr = msspll_hw->base + REG_MSSPLL_POSTDIV_CR;
+ u32 mult, ref_div, postdiv;
+ int divider_setting;
+ unsigned long rate_before_ctrl, flags;
+
+ mult = readl_relaxed(mult_addr) >> MSSPLL_FBDIV_SHIFT;
+ mult &= clk_div_mask(MSSPLL_FBDIV_WIDTH);
+ ref_div = readl_relaxed(ref_div_addr) >> MSSPLL_REFDIV_SHIFT;
+ ref_div &= clk_div_mask(MSSPLL_REFDIV_WIDTH);
+
+ rate_before_ctrl = rate * (ref_div * MSSPLL_FIXED_DIV) / mult;
+ divider_setting = divider_get_val(rate_before_ctrl, prate, NULL, MSSPLL_POSTDIV_WIDTH,
+ msspll_hw->flags);
+
+ if (divider_setting < 0)
+ return divider_setting;
+
+ spin_lock_irqsave(&mpfs_clk_lock, flags);
+
+ postdiv = readl_relaxed(postdiv_addr);
+ postdiv &= ~(clk_div_mask(MSSPLL_POSTDIV_WIDTH) << MSSPLL_POSTDIV_SHIFT);
+ writel_relaxed(postdiv, postdiv_addr);
+
+ spin_unlock_irqrestore(&mpfs_clk_lock, flags);
+
+ return 0;
+}
+
+static const struct clk_ops mpfs_clk_msspll_ops = {
+ .recalc_rate = mpfs_clk_msspll_recalc_rate,
+ .round_rate = mpfs_clk_msspll_round_rate,
+ .set_rate = mpfs_clk_msspll_set_rate,
+};
+
+#define CLK_PLL(_id, _name, _parent, _shift, _width, _flags, _offset) { \
+ .id = _id, \
+ .shift = _shift, \
+ .width = _width, \
+ .reg_offset = _offset, \
+ .flags = _flags, \
+ .hw.init = CLK_HW_INIT_PARENTS_DATA(_name, _parent, &mpfs_clk_msspll_ops, 0), \
+}
+
+static struct mpfs_msspll_hw_clock mpfs_msspll_clks[] = {
+ CLK_PLL(CLK_MSSPLL, "clk_msspll", mpfs_ext_ref, MSSPLL_FBDIV_SHIFT,
+ MSSPLL_FBDIV_WIDTH, 0, REG_MSSPLL_SSCG_2_CR),
+};
+
+static int mpfs_clk_register_mssplls(struct device *dev, struct mpfs_msspll_hw_clock *msspll_hws,
+ unsigned int num_clks, struct mpfs_clock_data *data)
+{
+ unsigned int i;
+ int ret;
+
+ for (i = 0; i < num_clks; i++) {
+ struct mpfs_msspll_hw_clock *msspll_hw = &msspll_hws[i];
+
+ msspll_hw->base = data->msspll_base;
+ ret = devm_clk_hw_register(dev, &msspll_hw->hw);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to register msspll id: %d\n",
+ CLK_MSSPLL);
+
+ data->hw_data.hws[msspll_hw->id] = &msspll_hw->hw;
+ }
+
+ return 0;
+}
+
+/*
+ * "CFG" clocks
+ */
+
+#define CLK_CFG(_id, _name, _parent, _shift, _width, _table, _flags, _offset) { \
+ .id = _id, \
+ .cfg.shift = _shift, \
+ .cfg.width = _width, \
+ .cfg.table = _table, \
+ .reg_offset = _offset, \
+ .cfg.flags = _flags, \
+ .cfg.hw.init = CLK_HW_INIT(_name, _parent, &clk_divider_ops, 0), \
+ .cfg.lock = &mpfs_clk_lock, \
+}
+
+#define CLK_CPU_OFFSET 0u
+#define CLK_AXI_OFFSET 1u
+#define CLK_AHB_OFFSET 2u
+#define CLK_RTCREF_OFFSET 3u
+
+static struct mpfs_cfg_hw_clock mpfs_cfg_clks[] = {
+ CLK_CFG(CLK_CPU, "clk_cpu", "clk_msspll", 0, 2, mpfs_div_cpu_axi_table, 0,
+ REG_CLOCK_CONFIG_CR),
+ CLK_CFG(CLK_AXI, "clk_axi", "clk_msspll", 2, 2, mpfs_div_cpu_axi_table, 0,
+ REG_CLOCK_CONFIG_CR),
+ CLK_CFG(CLK_AHB, "clk_ahb", "clk_msspll", 4, 2, mpfs_div_ahb_table, 0,
+ REG_CLOCK_CONFIG_CR),
+ {
+ .id = CLK_RTCREF,
+ .cfg.shift = 0,
+ .cfg.width = 12,
+ .cfg.table = mpfs_div_rtcref_table,
+ .reg_offset = REG_RTC_CLOCK_CR,
+ .cfg.flags = CLK_DIVIDER_ONE_BASED,
+ .cfg.hw.init =
+ CLK_HW_INIT_PARENTS_DATA("clk_rtcref", mpfs_ext_ref, &clk_divider_ops, 0),
+ }
+};
+
+static int mpfs_clk_register_cfgs(struct device *dev, struct mpfs_cfg_hw_clock *cfg_hws,
+ unsigned int num_clks, struct mpfs_clock_data *data)
+{
+ unsigned int i, id;
+ int ret;
+
+ for (i = 0; i < num_clks; i++) {
+ struct mpfs_cfg_hw_clock *cfg_hw = &cfg_hws[i];
+
+ cfg_hw->cfg.reg = data->base + cfg_hw->reg_offset;
+ ret = devm_clk_hw_register(dev, &cfg_hw->cfg.hw);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to register clock id: %d\n",
+ cfg_hw->id);
+
+ id = cfg_hw->id;
+ data->hw_data.hws[id] = &cfg_hw->cfg.hw;
+ }
+
+ return 0;
+}
+
+/*
+ * peripheral clocks - devices connected to axi or ahb buses.
+ */
+
+#define CLK_PERIPH(_id, _name, _parent, _shift, _flags) { \
+ .id = _id, \
+ .periph.bit_idx = _shift, \
+ .periph.hw.init = CLK_HW_INIT_HW(_name, _parent, &clk_gate_ops, \
+ _flags), \
+ .periph.lock = &mpfs_clk_lock, \
+}
+
+#define PARENT_CLK(PARENT) (&mpfs_cfg_clks[CLK_##PARENT##_OFFSET].cfg.hw)
+
+/*
+ * Critical clocks:
+ * - CLK_ENVM: reserved by hart software services (hss) superloop monitor/m mode interrupt
+ * trap handler
+ * - CLK_MMUART0: reserved by the hss
+ * - CLK_DDRC: provides clock to the ddr subsystem
+ * - CLK_RTC: the onboard RTC's AHB bus clock must be kept running as the rtc will stop
+ * if the AHB interface clock is disabled
+ * - CLK_FICx: these provide the processor side clocks to the "FIC" (Fabric InterConnect)
+ * clock domain crossers which provide the interface to the FPGA fabric. Disabling them
+ * causes the FPGA fabric to go into reset.
+ * - CLK_ATHENA: The athena clock is FIC4, which is reserved for the Athena TeraFire.
+ */
+
+static struct mpfs_periph_hw_clock mpfs_periph_clks[] = {
+ CLK_PERIPH(CLK_ENVM, "clk_periph_envm", PARENT_CLK(AHB), 0, CLK_IS_CRITICAL),
+ CLK_PERIPH(CLK_MAC0, "clk_periph_mac0", PARENT_CLK(AHB), 1, 0),
+ CLK_PERIPH(CLK_MAC1, "clk_periph_mac1", PARENT_CLK(AHB), 2, 0),
+ CLK_PERIPH(CLK_MMC, "clk_periph_mmc", PARENT_CLK(AHB), 3, 0),
+ CLK_PERIPH(CLK_TIMER, "clk_periph_timer", PARENT_CLK(RTCREF), 4, 0),
+ CLK_PERIPH(CLK_MMUART0, "clk_periph_mmuart0", PARENT_CLK(AHB), 5, CLK_IS_CRITICAL),
+ CLK_PERIPH(CLK_MMUART1, "clk_periph_mmuart1", PARENT_CLK(AHB), 6, 0),
+ CLK_PERIPH(CLK_MMUART2, "clk_periph_mmuart2", PARENT_CLK(AHB), 7, 0),
+ CLK_PERIPH(CLK_MMUART3, "clk_periph_mmuart3", PARENT_CLK(AHB), 8, 0),
+ CLK_PERIPH(CLK_MMUART4, "clk_periph_mmuart4", PARENT_CLK(AHB), 9, 0),
+ CLK_PERIPH(CLK_SPI0, "clk_periph_spi0", PARENT_CLK(AHB), 10, 0),
+ CLK_PERIPH(CLK_SPI1, "clk_periph_spi1", PARENT_CLK(AHB), 11, 0),
+ CLK_PERIPH(CLK_I2C0, "clk_periph_i2c0", PARENT_CLK(AHB), 12, 0),
+ CLK_PERIPH(CLK_I2C1, "clk_periph_i2c1", PARENT_CLK(AHB), 13, 0),
+ CLK_PERIPH(CLK_CAN0, "clk_periph_can0", PARENT_CLK(AHB), 14, 0),
+ CLK_PERIPH(CLK_CAN1, "clk_periph_can1", PARENT_CLK(AHB), 15, 0),
+ CLK_PERIPH(CLK_USB, "clk_periph_usb", PARENT_CLK(AHB), 16, 0),
+ CLK_PERIPH(CLK_RTC, "clk_periph_rtc", PARENT_CLK(AHB), 18, CLK_IS_CRITICAL),
+ CLK_PERIPH(CLK_QSPI, "clk_periph_qspi", PARENT_CLK(AHB), 19, 0),
+ CLK_PERIPH(CLK_GPIO0, "clk_periph_gpio0", PARENT_CLK(AHB), 20, 0),
+ CLK_PERIPH(CLK_GPIO1, "clk_periph_gpio1", PARENT_CLK(AHB), 21, 0),
+ CLK_PERIPH(CLK_GPIO2, "clk_periph_gpio2", PARENT_CLK(AHB), 22, 0),
+ CLK_PERIPH(CLK_DDRC, "clk_periph_ddrc", PARENT_CLK(AHB), 23, CLK_IS_CRITICAL),
+ CLK_PERIPH(CLK_FIC0, "clk_periph_fic0", PARENT_CLK(AXI), 24, CLK_IS_CRITICAL),
+ CLK_PERIPH(CLK_FIC1, "clk_periph_fic1", PARENT_CLK(AXI), 25, CLK_IS_CRITICAL),
+ CLK_PERIPH(CLK_FIC2, "clk_periph_fic2", PARENT_CLK(AXI), 26, CLK_IS_CRITICAL),
+ CLK_PERIPH(CLK_FIC3, "clk_periph_fic3", PARENT_CLK(AXI), 27, CLK_IS_CRITICAL),
+ CLK_PERIPH(CLK_ATHENA, "clk_periph_athena", PARENT_CLK(AXI), 28, CLK_IS_CRITICAL),
+ CLK_PERIPH(CLK_CFM, "clk_periph_cfm", PARENT_CLK(AHB), 29, 0),
+};
+
+static int mpfs_clk_register_periphs(struct device *dev, struct mpfs_periph_hw_clock *periph_hws,
+ int num_clks, struct mpfs_clock_data *data)
+{
+ unsigned int i, id;
+ int ret;
+
+ for (i = 0; i < num_clks; i++) {
+ struct mpfs_periph_hw_clock *periph_hw = &periph_hws[i];
+
+ periph_hw->periph.reg = data->base + REG_SUBBLK_CLOCK_CR;
+ ret = devm_clk_hw_register(dev, &periph_hw->periph.hw);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to register clock id: %d\n",
+ periph_hw->id);
+
+ id = periph_hws[i].id;
+ data->hw_data.hws[id] = &periph_hw->periph.hw;
+ }
+
+ return 0;
+}
+
+/*
+ * Peripheral clock resets
+ */
+
+#if IS_ENABLED(CONFIG_RESET_CONTROLLER)
+
+u32 mpfs_reset_read(struct device *dev)
+{
+ struct mpfs_clock_data *clock_data = dev_get_drvdata(dev->parent);
+
+ return readl_relaxed(clock_data->base + REG_SUBBLK_RESET_CR);
+}
+EXPORT_SYMBOL_NS_GPL(mpfs_reset_read, MCHP_CLK_MPFS);
+
+void mpfs_reset_write(struct device *dev, u32 val)
+{
+ struct mpfs_clock_data *clock_data = dev_get_drvdata(dev->parent);
+
+ writel_relaxed(val, clock_data->base + REG_SUBBLK_RESET_CR);
+}
+EXPORT_SYMBOL_NS_GPL(mpfs_reset_write, MCHP_CLK_MPFS);
+
+static void mpfs_reset_unregister_adev(void *_adev)
+{
+ struct auxiliary_device *adev = _adev;
+
+ auxiliary_device_delete(adev);
+}
+
+static void mpfs_reset_adev_release(struct device *dev)
+{
+ struct auxiliary_device *adev = to_auxiliary_dev(dev);
+
+ auxiliary_device_uninit(adev);
+
+ kfree(adev);
+}
+
+static struct auxiliary_device *mpfs_reset_adev_alloc(struct mpfs_clock_data *clk_data)
+{
+ struct auxiliary_device *adev;
+ int ret;
+
+ adev = kzalloc(sizeof(*adev), GFP_KERNEL);
+ if (!adev)
+ return ERR_PTR(-ENOMEM);
+
+ adev->name = "reset-mpfs";
+ adev->dev.parent = clk_data->dev;
+ adev->dev.release = mpfs_reset_adev_release;
+ adev->id = 666u;
+
+ ret = auxiliary_device_init(adev);
+ if (ret) {
+ kfree(adev);
+ return ERR_PTR(ret);
+ }
+
+ return adev;
+}
+
+static int mpfs_reset_controller_register(struct mpfs_clock_data *clk_data)
+{
+ struct auxiliary_device *adev;
+ int ret;
+
+ adev = mpfs_reset_adev_alloc(clk_data);
+ if (IS_ERR(adev))
+ return PTR_ERR(adev);
+
+ ret = auxiliary_device_add(adev);
+ if (ret) {
+ auxiliary_device_uninit(adev);
+ return ret;
+ }
+
+ return devm_add_action_or_reset(clk_data->dev, mpfs_reset_unregister_adev, adev);
+}
+
+#else /* !CONFIG_RESET_CONTROLLER */
+
+static int mpfs_reset_controller_register(struct mpfs_clock_data *clk_data)
+{
+ return 0;
+}
+
+#endif /* !CONFIG_RESET_CONTROLLER */
+
+static int mpfs_clk_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mpfs_clock_data *clk_data;
+ unsigned int num_clks;
+ int ret;
+
+ /* CLK_RESERVED is not part of clock arrays, so add 1 */
+ num_clks = ARRAY_SIZE(mpfs_msspll_clks) + ARRAY_SIZE(mpfs_cfg_clks)
+ + ARRAY_SIZE(mpfs_periph_clks) + 1;
+
+ clk_data = devm_kzalloc(dev, struct_size(clk_data, hw_data.hws, num_clks), GFP_KERNEL);
+ if (!clk_data)
+ return -ENOMEM;
+
+ clk_data->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(clk_data->base))
+ return PTR_ERR(clk_data->base);
+
+ clk_data->msspll_base = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(clk_data->msspll_base))
+ return PTR_ERR(clk_data->msspll_base);
+
+ clk_data->hw_data.num = num_clks;
+ clk_data->dev = dev;
+ dev_set_drvdata(dev, clk_data);
+
+ ret = mpfs_clk_register_mssplls(dev, mpfs_msspll_clks, ARRAY_SIZE(mpfs_msspll_clks),
+ clk_data);
+ if (ret)
+ return ret;
+
+ ret = mpfs_clk_register_cfgs(dev, mpfs_cfg_clks, ARRAY_SIZE(mpfs_cfg_clks), clk_data);
+ if (ret)
+ return ret;
+
+ ret = mpfs_clk_register_periphs(dev, mpfs_periph_clks, ARRAY_SIZE(mpfs_periph_clks),
+ clk_data);
+ if (ret)
+ return ret;
+
+ ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, &clk_data->hw_data);
+ if (ret)
+ return ret;
+
+ return mpfs_reset_controller_register(clk_data);
+}
+
+static const struct of_device_id mpfs_clk_of_match_table[] = {
+ { .compatible = "microchip,mpfs-clkcfg", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, mpfs_clk_of_match_table);
+
+static struct platform_driver mpfs_clk_driver = {
+ .probe = mpfs_clk_probe,
+ .driver = {
+ .name = "microchip-mpfs-clkcfg",
+ .of_match_table = mpfs_clk_of_match_table,
+ },
+};
+
+static int __init clk_mpfs_init(void)
+{
+ return platform_driver_register(&mpfs_clk_driver);
+}
+core_initcall(clk_mpfs_init);
+
+static void __exit clk_mpfs_exit(void)
+{
+ platform_driver_unregister(&mpfs_clk_driver);
+}
+module_exit(clk_mpfs_exit);
+
+MODULE_DESCRIPTION("Microchip PolarFire SoC Clock Driver");
+MODULE_AUTHOR("Padmarao Begari <padmarao.begari@microchip.com>");
+MODULE_AUTHOR("Daire McNamara <daire.mcnamara@microchip.com>");
+MODULE_AUTHOR("Conor Dooley <conor.dooley@microchip.com>");
+MODULE_LICENSE("GPL");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.