| Bo Shen | cc30b78 | 2012-06-27 21:58:20 +0000 | [diff] [blame] | 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 | } |