1 /* 2 * Copyright (C) 2016 Atmel Corporation 3 * Wenyou.Yang <wenyou.yang@atmel.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 <dm/util.h> 12 #include <linux/io.h> 13 #include <mach/at91_pmc.h> 14 #include "pmc.h" 15 16 DECLARE_GLOBAL_DATA_PTR; 17 18 #define H32MX_MAX_FREQ 90000000 19 20 static ulong sama5d4_h32mx_clk_get_rate(struct clk *clk) 21 { 22 struct pmc_platdata *plat = dev_get_platdata(clk->dev); 23 struct at91_pmc *pmc = plat->reg_base; 24 ulong rate = gd->arch.mck_rate_hz; 25 26 if (readl(&pmc->mckr) & AT91_PMC_MCKR_H32MXDIV) 27 rate /= 2; 28 29 if (rate > H32MX_MAX_FREQ) 30 dm_warn("H32MX clock is too fast\n"); 31 32 return rate; 33 } 34 35 static struct clk_ops sama5d4_h32mx_clk_ops = { 36 .get_rate = sama5d4_h32mx_clk_get_rate, 37 }; 38 39 static int sama5d4_h32mx_clk_probe(struct udevice *dev) 40 { 41 return at91_pmc_core_probe(dev); 42 } 43 44 static const struct udevice_id sama5d4_h32mx_clk_match[] = { 45 { .compatible = "atmel,sama5d4-clk-h32mx" }, 46 {} 47 }; 48 49 U_BOOT_DRIVER(sama5d4_h32mx_clk) = { 50 .name = "sama5d4-h32mx-clk", 51 .id = UCLASS_CLK, 52 .of_match = sama5d4_h32mx_clk_match, 53 .probe = sama5d4_h32mx_clk_probe, 54 .platdata_auto_alloc_size = sizeof(struct pmc_platdata), 55 .ops = &sama5d4_h32mx_clk_ops, 56 }; 57