1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Qualcomm A7 PLL driver 4 * 5 * Copyright (c) 2020, Linaro Limited 6 * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> 7 */ 8 9 #include <linux/clk-provider.h> 10 #include <linux/module.h> 11 #include <linux/platform_device.h> 12 #include <linux/regmap.h> 13 14 #include "clk-alpha-pll.h" 15 16 #define LUCID_PLL_OFF_L_VAL 0x04 17 18 static const struct pll_vco lucid_vco[] = { 19 { 249600000, 2000000000, 0 }, 20 }; 21 22 static struct clk_alpha_pll a7pll = { 23 .offset = 0x100, 24 .vco_table = lucid_vco, 25 .num_vco = ARRAY_SIZE(lucid_vco), 26 .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_LUCID], 27 .clkr = { 28 .hw.init = &(struct clk_init_data){ 29 .name = "a7pll", 30 .parent_data = &(const struct clk_parent_data){ 31 .fw_name = "bi_tcxo", 32 }, 33 .num_parents = 1, 34 .ops = &clk_alpha_pll_lucid_ops, 35 }, 36 }, 37 }; 38 39 static const struct alpha_pll_config a7pll_config = { 40 .l = 0x39, 41 .config_ctl_val = 0x20485699, 42 .config_ctl_hi_val = 0x2261, 43 .config_ctl_hi1_val = 0x029A699C, 44 .user_ctl_val = 0x1, 45 .user_ctl_hi_val = 0x805, 46 }; 47 48 static const struct regmap_config a7pll_regmap_config = { 49 .reg_bits = 32, 50 .reg_stride = 4, 51 .val_bits = 32, 52 .max_register = 0x1000, 53 .fast_io = true, 54 }; 55 56 static int qcom_a7pll_probe(struct platform_device *pdev) 57 { 58 struct device *dev = &pdev->dev; 59 struct regmap *regmap; 60 void __iomem *base; 61 u32 l_val; 62 int ret; 63 64 base = devm_platform_ioremap_resource(pdev, 0); 65 if (IS_ERR(base)) 66 return PTR_ERR(base); 67 68 regmap = devm_regmap_init_mmio(dev, base, &a7pll_regmap_config); 69 if (IS_ERR(regmap)) 70 return PTR_ERR(regmap); 71 72 /* Configure PLL only if the l_val is zero */ 73 regmap_read(regmap, a7pll.offset + LUCID_PLL_OFF_L_VAL, &l_val); 74 if (!l_val) 75 clk_lucid_pll_configure(&a7pll, regmap, &a7pll_config); 76 77 ret = devm_clk_register_regmap(dev, &a7pll.clkr); 78 if (ret) 79 return ret; 80 81 return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, 82 &a7pll.clkr.hw); 83 } 84 85 static const struct of_device_id qcom_a7pll_match_table[] = { 86 { .compatible = "qcom,sdx55-a7pll" }, 87 { } 88 }; 89 MODULE_DEVICE_TABLE(of, qcom_a7pll_match_table); 90 91 static struct platform_driver qcom_a7pll_driver = { 92 .probe = qcom_a7pll_probe, 93 .driver = { 94 .name = "qcom-a7pll", 95 .of_match_table = qcom_a7pll_match_table, 96 }, 97 }; 98 module_platform_driver(qcom_a7pll_driver); 99 100 MODULE_DESCRIPTION("Qualcomm A7 PLL Driver"); 101 MODULE_LICENSE("GPL v2"); 102