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 #include "ehci-core.h" 35 36 /* Enable UTMI PLL time out 500us 37 * 10 times as datasheet specified 38 */ 39 #define EN_UPLL_TIMEOUT 500UL 40 41 int ehci_hcd_init(void) 42 { 43 at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC; 44 ulong start_time, tmp_time; 45 46 start_time = get_timer(0); 47 /* Enable UTMI PLL */ 48 writel(AT91_PMC_UPLLEN | AT91_PMC_BIASEN, &pmc->uckr); 49 while ((readl(&pmc->sr) & AT91_PMC_LOCKU) != AT91_PMC_LOCKU) { 50 WATCHDOG_RESET(); 51 tmp_time = get_timer(0); 52 if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) { 53 printf("ERROR: failed to enable UPLL\n"); 54 return -1; 55 } 56 } 57 58 /* Enable USB Host clock */ 59 writel(1 << ATMEL_ID_UHPHS, &pmc->pcer); 60 61 hccr = (struct ehci_hccr *)ATMEL_BASE_EHCI; 62 hcor = (struct ehci_hcor *)((uint32_t)hccr + 63 HC_LENGTH(ehci_readl(&hccr->cr_capbase))); 64 65 return 0; 66 } 67 68 int ehci_hcd_stop(void) 69 { 70 at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC; 71 ulong start_time, tmp_time; 72 73 /* Disable USB Host Clock */ 74 writel(1 << ATMEL_ID_UHPHS, &pmc->pcdr); 75 76 start_time = get_timer(0); 77 /* Disable UTMI PLL */ 78 writel(readl(&pmc->uckr) & ~AT91_PMC_UPLLEN, &pmc->uckr); 79 while ((readl(&pmc->sr) & AT91_PMC_LOCKU) == AT91_PMC_LOCKU) { 80 WATCHDOG_RESET(); 81 tmp_time = get_timer(0); 82 if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) { 83 printf("ERROR: failed to stop UPLL\n"); 84 return -1; 85 } 86 } 87 88 return 0; 89 } 90