1 /* 2 * Copyright (C) 2018 Microhip / Atmel Corporation 3 * Wenyou.Yang <wenyou.yang@microchip.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <clk-uclass.h> 10 #include <dm/device.h> 11 #include <linux/io.h> 12 #include <mach/at91_pmc.h> 13 #include "pmc.h" 14 15 DECLARE_GLOBAL_DATA_PTR; 16 17 static int at91_plladiv_clk_enable(struct clk *clk) 18 { 19 return 0; 20 } 21 22 static ulong at91_plladiv_clk_get_rate(struct clk *clk) 23 { 24 struct pmc_platdata *plat = dev_get_platdata(clk->dev); 25 struct at91_pmc *pmc = plat->reg_base; 26 struct clk source; 27 ulong clk_rate; 28 int ret; 29 30 ret = clk_get_by_index(clk->dev, 0, &source); 31 if (ret) 32 return -EINVAL; 33 34 clk_rate = clk_get_rate(&source); 35 if (readl(&pmc->mckr) & AT91_PMC_MCKR_PLLADIV_2) 36 clk_rate /= 2; 37 38 return clk_rate; 39 } 40 41 static ulong at91_plladiv_clk_set_rate(struct clk *clk, ulong rate) 42 { 43 struct pmc_platdata *plat = dev_get_platdata(clk->dev); 44 struct at91_pmc *pmc = plat->reg_base; 45 struct clk source; 46 ulong parent_rate; 47 int ret; 48 49 ret = clk_get_by_index(clk->dev, 0, &source); 50 if (ret) 51 return -EINVAL; 52 53 parent_rate = clk_get_rate(&source); 54 if ((parent_rate != rate) && ((parent_rate) / 2 != rate)) 55 return -EINVAL; 56 57 if (parent_rate != rate) { 58 writel((readl(&pmc->mckr) | AT91_PMC_MCKR_PLLADIV_2), 59 &pmc->mckr); 60 } 61 62 return 0; 63 } 64 65 static struct clk_ops at91_plladiv_clk_ops = { 66 .enable = at91_plladiv_clk_enable, 67 .get_rate = at91_plladiv_clk_get_rate, 68 .set_rate = at91_plladiv_clk_set_rate, 69 }; 70 71 static int at91_plladiv_clk_probe(struct udevice *dev) 72 { 73 return at91_pmc_core_probe(dev); 74 } 75 76 static const struct udevice_id at91_plladiv_clk_match[] = { 77 { .compatible = "atmel,at91sam9x5-clk-plldiv" }, 78 {} 79 }; 80 81 U_BOOT_DRIVER(at91_plladiv_clk) = { 82 .name = "at91-plladiv-clk", 83 .id = UCLASS_CLK, 84 .of_match = at91_plladiv_clk_match, 85 .probe = at91_plladiv_clk_probe, 86 .platdata_auto_alloc_size = sizeof(struct pmc_platdata), 87 .ops = &at91_plladiv_clk_ops, 88 }; 89