1 /* 2 * (C) Copyright 2012 3 * Atmel Semiconductor <www.atmel.com> 4 * Written-by: Bo Shen <voice.shen@atmel.com> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <watchdog.h> 11 #include <usb.h> 12 #include <asm/io.h> 13 #include <asm/arch/hardware.h> 14 #include <asm/arch/at91_pmc.h> 15 #include <asm/arch/clk.h> 16 17 #include "ehci.h" 18 19 /* Enable UTMI PLL time out 500us 20 * 10 times as datasheet specified 21 */ 22 #define EN_UPLL_TIMEOUT 500UL 23 24 int ehci_hcd_init(int index, struct ehci_hccr **hccr, struct ehci_hcor **hcor) 25 { 26 at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC; 27 ulong start_time, tmp_time; 28 29 start_time = get_timer(0); 30 /* Enable UTMI PLL */ 31 writel(AT91_PMC_UPLLEN | AT91_PMC_BIASEN, &pmc->uckr); 32 while ((readl(&pmc->sr) & AT91_PMC_LOCKU) != AT91_PMC_LOCKU) { 33 WATCHDOG_RESET(); 34 tmp_time = get_timer(0); 35 if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) { 36 printf("ERROR: failed to enable UPLL\n"); 37 return -1; 38 } 39 } 40 41 /* Enable USB Host clock */ 42 writel(1 << ATMEL_ID_UHPHS, &pmc->pcer); 43 44 *hccr = (struct ehci_hccr *)ATMEL_BASE_EHCI; 45 *hcor = (struct ehci_hcor *)((uint32_t)*hccr + 46 HC_LENGTH(ehci_readl(&(*hccr)->cr_capbase))); 47 48 return 0; 49 } 50 51 int ehci_hcd_stop(int index) 52 { 53 at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC; 54 ulong start_time, tmp_time; 55 56 /* Disable USB Host Clock */ 57 writel(1 << ATMEL_ID_UHPHS, &pmc->pcdr); 58 59 start_time = get_timer(0); 60 /* Disable UTMI PLL */ 61 writel(readl(&pmc->uckr) & ~AT91_PMC_UPLLEN, &pmc->uckr); 62 while ((readl(&pmc->sr) & AT91_PMC_LOCKU) == AT91_PMC_LOCKU) { 63 WATCHDOG_RESET(); 64 tmp_time = get_timer(0); 65 if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) { 66 printf("ERROR: failed to stop UPLL\n"); 67 return -1; 68 } 69 } 70 71 return 0; 72 } 73