1 /* 2 * (C) Copyright 2012 3 * Atmel Semiconductor <www.atmel.com> 4 * Written-by: Bo Shen <voice.shen@atmel.com> 5 * 6 * See file CREDITS for list of people who contributed to this 7 * project. 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License as 11 * published by the Free Software Foundation; either version 2 of 12 * the License, or (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 22 * MA 02110-1301 USA 23 */ 24 25 #include <common.h> 26 #include <watchdog.h> 27 #include <usb.h> 28 #include <asm/io.h> 29 #include <asm/arch/hardware.h> 30 #include <asm/arch/at91_pmc.h> 31 #include <asm/arch/clk.h> 32 33 #include "ehci.h" 34 35 /* Enable UTMI PLL time out 500us 36 * 10 times as datasheet specified 37 */ 38 #define EN_UPLL_TIMEOUT 500UL 39 40 int ehci_hcd_init(int index, struct ehci_hccr **hccr, struct ehci_hcor **hcor) 41 { 42 at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC; 43 ulong start_time, tmp_time; 44 45 start_time = get_timer(0); 46 /* Enable UTMI PLL */ 47 writel(AT91_PMC_UPLLEN | AT91_PMC_BIASEN, &pmc->uckr); 48 while ((readl(&pmc->sr) & AT91_PMC_LOCKU) != AT91_PMC_LOCKU) { 49 WATCHDOG_RESET(); 50 tmp_time = get_timer(0); 51 if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) { 52 printf("ERROR: failed to enable UPLL\n"); 53 return -1; 54 } 55 } 56 57 /* Enable USB Host clock */ 58 writel(1 << ATMEL_ID_UHPHS, &pmc->pcer); 59 60 *hccr = (struct ehci_hccr *)ATMEL_BASE_EHCI; 61 *hcor = (struct ehci_hcor *)((uint32_t)*hccr + 62 HC_LENGTH(ehci_readl(&(*hccr)->cr_capbase))); 63 64 return 0; 65 } 66 67 int ehci_hcd_stop(int index) 68 { 69 at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC; 70 ulong start_time, tmp_time; 71 72 /* Disable USB Host Clock */ 73 writel(1 << ATMEL_ID_UHPHS, &pmc->pcdr); 74 75 start_time = get_timer(0); 76 /* Disable UTMI PLL */ 77 writel(readl(&pmc->uckr) & ~AT91_PMC_UPLLEN, &pmc->uckr); 78 while ((readl(&pmc->sr) & AT91_PMC_LOCKU) == AT91_PMC_LOCKU) { 79 WATCHDOG_RESET(); 80 tmp_time = get_timer(0); 81 if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) { 82 printf("ERROR: failed to stop UPLL\n"); 83 return -1; 84 } 85 } 86 87 return 0; 88 } 89