drivers/usb/host/ohci-at91.c

   1 /*
   2  * (C) Copyright 2006
   3  * DENX Software Engineering <mk@denx.de>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9
  10 #if defined(CONFIG_USB_OHCI_NEW) && defined(CONFIG_SYS_USB_OHCI_CPU_INIT)
  11
  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 int usb_cpu_init(void)
  18 {
  19         at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
  20
  21 #ifdef CONFIG_USB_ATMEL_CLK_SEL_PLLB
  22         /* Enable PLLB */
  23         writel(get_pllb_init(), &pmc->pllbr);
  24         while ((readl(&pmc->sr) & AT91_PMC_LOCKB) != AT91_PMC_LOCKB)
  25                 ;
  26 #ifdef CONFIG_AT91SAM9N12
  27         writel(AT91_PMC_USBS_USB_PLLB | AT91_PMC_USB_DIV_2, &pmc->usb);
  28 #endif
  29 #elif defined(CONFIG_USB_ATMEL_CLK_SEL_UPLL)
  30         /* Enable UPLL */
  31         writel(readl(&pmc->uckr) | AT91_PMC_UPLLEN | AT91_PMC_BIASEN,
  32                 &pmc->uckr);
  33         while ((readl(&pmc->sr) & AT91_PMC_LOCKU) != AT91_PMC_LOCKU)
  34                 ;
  35
  36         /* Select PLLA as input clock of OHCI */
  37         writel(AT91_PMC_USBS_USB_UPLL | AT91_PMC_USBDIV_10, &pmc->usb);
  38 #endif
  39
  40         /* Enable USB host clock. */
  41 #ifdef CPU_HAS_PCR
  42         at91_periph_clk_enable(ATMEL_ID_UHP);
  43 #else
  44         writel(1 << ATMEL_ID_UHP, &pmc->pcer);
  45 #endif
  46
  47 #if defined(CONFIG_AT91SAM9261) || defined(CONFIG_AT91SAM9G10)
  48         writel(ATMEL_PMC_UHP | AT91_PMC_HCK0, &pmc->scer);
  49 #else
  50         writel(ATMEL_PMC_UHP, &pmc->scer);
  51 #endif
  52
  53         return 0;
  54 }
  55
  56 int usb_cpu_stop(void)
  57 {
  58         at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
  59
  60         /* Disable USB host clock. */
  61 #ifdef CPU_HAS_PCR
  62         at91_periph_clk_disable(ATMEL_ID_UHP);
  63 #else
  64         writel(1 << ATMEL_ID_UHP, &pmc->pcdr);
  65 #endif
  66
  67 #if defined(CONFIG_AT91SAM9261) || defined(CONFIG_AT91SAM9G10)
  68         writel(ATMEL_PMC_UHP | AT91_PMC_HCK0, &pmc->scdr);
  69 #else
  70         writel(ATMEL_PMC_UHP, &pmc->scdr);
  71 #endif
  72
  73 #ifdef CONFIG_USB_ATMEL_CLK_SEL_PLLB
  74 #ifdef CONFIG_AT91SAM9N12
  75         writel(0, &pmc->usb);
  76 #endif
  77         /* Disable PLLB */
  78         writel(0, &pmc->pllbr);
  79         while ((readl(&pmc->sr) & AT91_PMC_LOCKB) != 0)
  80                 ;
  81 #elif defined(CONFIG_USB_ATMEL_CLK_SEL_UPLL)
  82         /* Disable UPLL */
  83         writel(readl(&pmc->uckr) & (~AT91_PMC_UPLLEN), &pmc->uckr);
  84         while ((readl(&pmc->sr) & AT91_PMC_LOCKU) == AT91_PMC_LOCKU)
  85                 ;
  86 #endif
  87
  88         return 0;
  89 }
  90
  91 int usb_cpu_init_fail(void)
  92 {
  93         return usb_cpu_stop();
  94 }
  95
  96 #endif /* defined(CONFIG_USB_OHCI) && defined(CONFIG_SYS_USB_OHCI_CPU_INIT) */