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path: root/drivers/clk/microchip/clk-mpfs-ccc.c
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-rw-r--r--drivers/clk/microchip/clk-mpfs-ccc.c293
1 files changed, 293 insertions, 0 deletions
diff --git a/drivers/clk/microchip/clk-mpfs-ccc.c b/drivers/clk/microchip/clk-mpfs-ccc.c
new file mode 100644
index 0000000000..bce61c45e9
--- /dev/null
+++ b/drivers/clk/microchip/clk-mpfs-ccc.c
@@ -0,0 +1,293 @@
+// 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_kasprintf(dev, GFP_KERNEL, "%s_out%u", parent->name, i);
+
+ if (!name)
+ return -ENOMEM;
+
+ 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];
+
+ pll_hw->name = devm_kasprintf(dev, GFP_KERNEL, "ccc%s_pll%u",
+ strchrnul(dev->of_node->full_name, '@'), i);
+ if (!pll_hw->name)
+ return -ENOMEM;
+
+ pll_hw->base = data->pll_base[i];
+ 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>");