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.h> 11 #include <linux/io.h> 12 #include <mach/at91_pmc.h> 13 #include "pmc.h" 14 15 DECLARE_GLOBAL_DATA_PTR; 16 17 #define UTMI_FIXED_MUL 40 18 19 static int utmi_clk_enable(struct clk *clk) 20 { 21 struct pmc_platdata *plat = dev_get_platdata(clk->dev); 22 struct at91_pmc *pmc = plat->reg_base; 23 u32 tmp; 24 25 if (readl(&pmc->sr) & AT91_PMC_LOCKU) 26 return 0; 27 28 tmp = readl(&pmc->uckr); 29 tmp |= AT91_PMC_UPLLEN | 30 AT91_PMC_UPLLCOUNT | 31 AT91_PMC_BIASEN; 32 writel(tmp, &pmc->uckr); 33 34 while (!(readl(&pmc->sr) & AT91_PMC_LOCKU)) 35 ; 36 37 return 0; 38 } 39 40 static ulong utmi_clk_get_rate(struct clk *clk) 41 { 42 return gd->arch.main_clk_rate_hz * UTMI_FIXED_MUL; 43 } 44 45 static struct clk_ops utmi_clk_ops = { 46 .enable = utmi_clk_enable, 47 .get_rate = utmi_clk_get_rate, 48 }; 49 50 static int utmi_clk_probe(struct udevice *dev) 51 { 52 return at91_pmc_core_probe(dev); 53 } 54 55 static const struct udevice_id utmi_clk_match[] = { 56 { .compatible = "atmel,at91sam9x5-clk-utmi" }, 57 {} 58 }; 59 60 U_BOOT_DRIVER(at91sam9x5_utmi_clk) = { 61 .name = "at91sam9x5-utmi-clk", 62 .id = UCLASS_CLK, 63 .of_match = utmi_clk_match, 64 .probe = utmi_clk_probe, 65 .platdata_auto_alloc_size = sizeof(struct pmc_platdata), 66 .ops = &utmi_clk_ops, 67 }; 68