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, enum usb_init_type init, 25 struct ehci_hccr **hccr, struct ehci_hcor **hcor) 26 { 27 at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC; 28 ulong start_time, tmp_time; 29 30 start_time = get_timer(0); 31 /* Enable UTMI PLL */ 32 writel(AT91_PMC_UPLLEN | AT91_PMC_BIASEN, &pmc->uckr); 33 while ((readl(&pmc->sr) & AT91_PMC_LOCKU) != AT91_PMC_LOCKU) { 34 WATCHDOG_RESET(); 35 tmp_time = get_timer(0); 36 if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) { 37 printf("ERROR: failed to enable UPLL\n"); 38 return -1; 39 } 40 } 41 42 /* Enable USB Host clock */ 43 writel(1 << ATMEL_ID_UHPHS, &pmc->pcer); 44 45 *hccr = (struct ehci_hccr *)ATMEL_BASE_EHCI; 46 *hcor = (struct ehci_hcor *)((uint32_t)*hccr + 47 HC_LENGTH(ehci_readl(&(*hccr)->cr_capbase))); 48 49 return 0; 50 } 51 52 int ehci_hcd_stop(int index) 53 { 54 at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC; 55 ulong start_time, tmp_time; 56 57 /* Disable USB Host Clock */ 58 writel(1 << ATMEL_ID_UHPHS, &pmc->pcdr); 59 60 start_time = get_timer(0); 61 /* Disable UTMI PLL */ 62 writel(readl(&pmc->uckr) & ~AT91_PMC_UPLLEN, &pmc->uckr); 63 while ((readl(&pmc->sr) & AT91_PMC_LOCKU) == AT91_PMC_LOCKU) { 64 WATCHDOG_RESET(); 65 tmp_time = get_timer(0); 66 if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) { 67 printf("ERROR: failed to stop UPLL\n"); 68 return -1; 69 } 70 } 71 72 return 0; 73 } 74