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path: root/drivers/clk/qcom/clk-cbf-8996.c
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-rw-r--r--drivers/clk/qcom/clk-cbf-8996.c379
1 files changed, 379 insertions, 0 deletions
diff --git a/drivers/clk/qcom/clk-cbf-8996.c b/drivers/clk/qcom/clk-cbf-8996.c
new file mode 100644
index 0000000000..53f205a3f1
--- /dev/null
+++ b/drivers/clk/qcom/clk-cbf-8996.c
@@ -0,0 +1,379 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2022, 2023 Linaro Ltd.
+ */
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/interconnect-clk.h>
+#include <linux/interconnect-provider.h>
+#include <linux/of.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <dt-bindings/interconnect/qcom,msm8996-cbf.h>
+
+#include "clk-alpha-pll.h"
+#include "clk-regmap.h"
+
+/* Need to match the order of clocks in DT binding */
+enum {
+ DT_XO,
+ DT_APCS_AUX,
+};
+
+enum {
+ CBF_XO_INDEX,
+ CBF_PLL_INDEX,
+ CBF_DIV_INDEX,
+ CBF_APCS_AUX_INDEX,
+};
+
+#define DIV_THRESHOLD 600000000
+
+#define CBF_MUX_OFFSET 0x18
+#define CBF_MUX_PARENT_MASK GENMASK(1, 0)
+#define CBF_MUX_AUTO_CLK_SEL_ALWAYS_ON_MASK GENMASK(5, 4)
+#define CBF_MUX_AUTO_CLK_SEL_ALWAYS_ON_GPLL0_SEL \
+ FIELD_PREP(CBF_MUX_AUTO_CLK_SEL_ALWAYS_ON_MASK, 0x03)
+#define CBF_MUX_AUTO_CLK_SEL_BIT BIT(6)
+
+#define CBF_PLL_OFFSET 0xf000
+
+static const u8 cbf_pll_regs[PLL_OFF_MAX_REGS] = {
+ [PLL_OFF_L_VAL] = 0x08,
+ [PLL_OFF_ALPHA_VAL] = 0x10,
+ [PLL_OFF_USER_CTL] = 0x18,
+ [PLL_OFF_CONFIG_CTL] = 0x20,
+ [PLL_OFF_CONFIG_CTL_U] = 0x24,
+ [PLL_OFF_TEST_CTL] = 0x30,
+ [PLL_OFF_TEST_CTL_U] = 0x34,
+ [PLL_OFF_STATUS] = 0x28,
+};
+
+static struct alpha_pll_config cbfpll_config = {
+ .l = 72,
+ .config_ctl_val = 0x200d4828,
+ .config_ctl_hi_val = 0x006,
+ .test_ctl_val = 0x1c000000,
+ .test_ctl_hi_val = 0x00004000,
+ .pre_div_mask = BIT(12),
+ .post_div_mask = 0x3 << 8,
+ .post_div_val = 0x1 << 8,
+ .main_output_mask = BIT(0),
+ .early_output_mask = BIT(3),
+};
+
+static struct clk_alpha_pll cbf_pll = {
+ .offset = CBF_PLL_OFFSET,
+ .regs = cbf_pll_regs,
+ .flags = SUPPORTS_DYNAMIC_UPDATE | SUPPORTS_FSM_MODE,
+ .clkr.hw.init = &(struct clk_init_data){
+ .name = "cbf_pll",
+ .parent_data = (const struct clk_parent_data[]) {
+ { .index = DT_XO, },
+ },
+ .num_parents = 1,
+ .ops = &clk_alpha_pll_hwfsm_ops,
+ },
+};
+
+static struct clk_fixed_factor cbf_pll_postdiv = {
+ .mult = 1,
+ .div = 2,
+ .hw.init = &(struct clk_init_data){
+ .name = "cbf_pll_postdiv",
+ .parent_hws = (const struct clk_hw*[]){
+ &cbf_pll.clkr.hw
+ },
+ .num_parents = 1,
+ .ops = &clk_fixed_factor_ops,
+ .flags = CLK_SET_RATE_PARENT,
+ },
+};
+
+static const struct clk_parent_data cbf_mux_parent_data[] = {
+ { .index = DT_XO },
+ { .hw = &cbf_pll.clkr.hw },
+ { .hw = &cbf_pll_postdiv.hw },
+ { .index = DT_APCS_AUX },
+};
+
+struct clk_cbf_8996_mux {
+ u32 reg;
+ struct notifier_block nb;
+ struct clk_regmap clkr;
+};
+
+static struct clk_cbf_8996_mux *to_clk_cbf_8996_mux(struct clk_regmap *clkr)
+{
+ return container_of(clkr, struct clk_cbf_8996_mux, clkr);
+}
+
+static int cbf_clk_notifier_cb(struct notifier_block *nb, unsigned long event,
+ void *data);
+
+static u8 clk_cbf_8996_mux_get_parent(struct clk_hw *hw)
+{
+ struct clk_regmap *clkr = to_clk_regmap(hw);
+ struct clk_cbf_8996_mux *mux = to_clk_cbf_8996_mux(clkr);
+ u32 val;
+
+ regmap_read(clkr->regmap, mux->reg, &val);
+
+ return FIELD_GET(CBF_MUX_PARENT_MASK, val);
+}
+
+static int clk_cbf_8996_mux_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct clk_regmap *clkr = to_clk_regmap(hw);
+ struct clk_cbf_8996_mux *mux = to_clk_cbf_8996_mux(clkr);
+ u32 val;
+
+ val = FIELD_PREP(CBF_MUX_PARENT_MASK, index);
+
+ return regmap_update_bits(clkr->regmap, mux->reg, CBF_MUX_PARENT_MASK, val);
+}
+
+static int clk_cbf_8996_mux_determine_rate(struct clk_hw *hw,
+ struct clk_rate_request *req)
+{
+ struct clk_hw *parent;
+
+ if (req->rate < (DIV_THRESHOLD / cbf_pll_postdiv.div))
+ return -EINVAL;
+
+ if (req->rate < DIV_THRESHOLD)
+ parent = clk_hw_get_parent_by_index(hw, CBF_DIV_INDEX);
+ else
+ parent = clk_hw_get_parent_by_index(hw, CBF_PLL_INDEX);
+
+ if (!parent)
+ return -EINVAL;
+
+ req->best_parent_rate = clk_hw_round_rate(parent, req->rate);
+ req->best_parent_hw = parent;
+
+ return 0;
+}
+
+static const struct clk_ops clk_cbf_8996_mux_ops = {
+ .set_parent = clk_cbf_8996_mux_set_parent,
+ .get_parent = clk_cbf_8996_mux_get_parent,
+ .determine_rate = clk_cbf_8996_mux_determine_rate,
+};
+
+static struct clk_cbf_8996_mux cbf_mux = {
+ .reg = CBF_MUX_OFFSET,
+ .nb.notifier_call = cbf_clk_notifier_cb,
+ .clkr.hw.init = &(struct clk_init_data) {
+ .name = "cbf_mux",
+ .parent_data = cbf_mux_parent_data,
+ .num_parents = ARRAY_SIZE(cbf_mux_parent_data),
+ .ops = &clk_cbf_8996_mux_ops,
+ /* CPU clock is critical and should never be gated */
+ .flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
+ },
+};
+
+static int cbf_clk_notifier_cb(struct notifier_block *nb, unsigned long event,
+ void *data)
+{
+ struct clk_notifier_data *cnd = data;
+
+ switch (event) {
+ case PRE_RATE_CHANGE:
+ /*
+ * Avoid overvolting. clk_core_set_rate_nolock() walks from top
+ * to bottom, so it will change the rate of the PLL before
+ * chaging the parent of PMUX. This can result in pmux getting
+ * clocked twice the expected rate.
+ *
+ * Manually switch to PLL/2 here.
+ */
+ if (cnd->old_rate > DIV_THRESHOLD &&
+ cnd->new_rate < DIV_THRESHOLD)
+ clk_cbf_8996_mux_set_parent(&cbf_mux.clkr.hw, CBF_DIV_INDEX);
+ break;
+ case ABORT_RATE_CHANGE:
+ /* Revert manual change */
+ if (cnd->new_rate < DIV_THRESHOLD &&
+ cnd->old_rate > DIV_THRESHOLD)
+ clk_cbf_8996_mux_set_parent(&cbf_mux.clkr.hw, CBF_PLL_INDEX);
+ break;
+ default:
+ break;
+ }
+
+ return notifier_from_errno(0);
+};
+
+static struct clk_hw *cbf_msm8996_hw_clks[] = {
+ &cbf_pll_postdiv.hw,
+};
+
+static struct clk_regmap *cbf_msm8996_clks[] = {
+ &cbf_pll.clkr,
+ &cbf_mux.clkr,
+};
+
+static const struct regmap_config cbf_msm8996_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = 0x10000,
+ .fast_io = true,
+ .val_format_endian = REGMAP_ENDIAN_LITTLE,
+};
+
+#ifdef CONFIG_INTERCONNECT
+
+/* Random ID that doesn't clash with main qnoc and OSM */
+#define CBF_MASTER_NODE 2000
+
+static int qcom_msm8996_cbf_icc_register(struct platform_device *pdev, struct clk_hw *cbf_hw)
+{
+ struct device *dev = &pdev->dev;
+ struct clk *clk = devm_clk_hw_get_clk(dev, cbf_hw, "cbf");
+ const struct icc_clk_data data[] = {
+ { .clk = clk, .name = "cbf", },
+ };
+ struct icc_provider *provider;
+
+ provider = icc_clk_register(dev, CBF_MASTER_NODE, ARRAY_SIZE(data), data);
+ if (IS_ERR(provider))
+ return PTR_ERR(provider);
+
+ platform_set_drvdata(pdev, provider);
+
+ return 0;
+}
+
+static int qcom_msm8996_cbf_icc_remove(struct platform_device *pdev)
+{
+ struct icc_provider *provider = platform_get_drvdata(pdev);
+
+ icc_clk_unregister(provider);
+
+ return 0;
+}
+#define qcom_msm8996_cbf_icc_sync_state icc_sync_state
+#else
+static int qcom_msm8996_cbf_icc_register(struct platform_device *pdev, struct clk_hw *cbf_hw)
+{
+ dev_warn(&pdev->dev, "CONFIG_INTERCONNECT is disabled, CBF clock is fixed\n");
+
+ return 0;
+}
+#define qcom_msm8996_cbf_icc_remove(pdev) (0)
+#define qcom_msm8996_cbf_icc_sync_state NULL
+#endif
+
+static int qcom_msm8996_cbf_probe(struct platform_device *pdev)
+{
+ void __iomem *base;
+ struct regmap *regmap;
+ struct device *dev = &pdev->dev;
+ int i, ret;
+
+ base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ regmap = devm_regmap_init_mmio(dev, base, &cbf_msm8996_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ /* Select GPLL0 for 300MHz for the CBF clock */
+ regmap_write(regmap, CBF_MUX_OFFSET, 0x3);
+
+ /* Ensure write goes through before PLLs are reconfigured */
+ udelay(5);
+
+ /* Set the auto clock sel always-on source to GPLL0/2 (300MHz) */
+ regmap_update_bits(regmap, CBF_MUX_OFFSET,
+ CBF_MUX_AUTO_CLK_SEL_ALWAYS_ON_MASK,
+ CBF_MUX_AUTO_CLK_SEL_ALWAYS_ON_GPLL0_SEL);
+
+ clk_alpha_pll_configure(&cbf_pll, regmap, &cbfpll_config);
+
+ /* Wait for PLL(s) to lock */
+ udelay(50);
+
+ /* Enable auto clock selection for CBF */
+ regmap_update_bits(regmap, CBF_MUX_OFFSET,
+ CBF_MUX_AUTO_CLK_SEL_BIT,
+ CBF_MUX_AUTO_CLK_SEL_BIT);
+
+ /* Ensure write goes through before muxes are switched */
+ udelay(5);
+
+ /* Switch CBF to use the primary PLL */
+ regmap_update_bits(regmap, CBF_MUX_OFFSET, CBF_MUX_PARENT_MASK, 0x1);
+
+ if (of_device_is_compatible(dev->of_node, "qcom,msm8996pro-cbf")) {
+ cbfpll_config.post_div_val = 0x3 << 8;
+ cbf_pll_postdiv.div = 4;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(cbf_msm8996_hw_clks); i++) {
+ ret = devm_clk_hw_register(dev, cbf_msm8996_hw_clks[i]);
+ if (ret)
+ return ret;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(cbf_msm8996_clks); i++) {
+ ret = devm_clk_register_regmap(dev, cbf_msm8996_clks[i]);
+ if (ret)
+ return ret;
+ }
+
+ ret = devm_clk_notifier_register(dev, cbf_mux.clkr.hw.clk, &cbf_mux.nb);
+ if (ret)
+ return ret;
+
+ ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, &cbf_mux.clkr.hw);
+ if (ret)
+ return ret;
+
+ return qcom_msm8996_cbf_icc_register(pdev, &cbf_mux.clkr.hw);
+}
+
+static int qcom_msm8996_cbf_remove(struct platform_device *pdev)
+{
+ return qcom_msm8996_cbf_icc_remove(pdev);
+}
+
+static const struct of_device_id qcom_msm8996_cbf_match_table[] = {
+ { .compatible = "qcom,msm8996-cbf" },
+ { .compatible = "qcom,msm8996pro-cbf" },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, qcom_msm8996_cbf_match_table);
+
+static struct platform_driver qcom_msm8996_cbf_driver = {
+ .probe = qcom_msm8996_cbf_probe,
+ .remove = qcom_msm8996_cbf_remove,
+ .driver = {
+ .name = "qcom-msm8996-cbf",
+ .of_match_table = qcom_msm8996_cbf_match_table,
+ .sync_state = qcom_msm8996_cbf_icc_sync_state,
+ },
+};
+
+/* Register early enough to fix the clock to be used for other cores */
+static int __init qcom_msm8996_cbf_init(void)
+{
+ return platform_driver_register(&qcom_msm8996_cbf_driver);
+}
+postcore_initcall(qcom_msm8996_cbf_init);
+
+static void __exit qcom_msm8996_cbf_exit(void)
+{
+ platform_driver_unregister(&qcom_msm8996_cbf_driver);
+}
+module_exit(qcom_msm8996_cbf_exit);
+
+MODULE_DESCRIPTION("QCOM MSM8996 CPU Bus Fabric Clock Driver");
+MODULE_LICENSE("GPL");