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         at91_periph_clk_enable(ATMEL_ID_UHP);
  41
  42         at91_system_clk_enable(ATMEL_PMC_UHP);
  43 #if defined(CONFIG_AT91SAM9261) || defined(CONFIG_AT91SAM9G10)
  44         at91_system_clk_enable(AT91_PMC_HCK0);
  45 #endif
  46
  47         return 0;
  48 }
  49
  50 int usb_cpu_stop(void)
  51 {
  52         at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
  53
  54         at91_periph_clk_disable(ATMEL_ID_UHP);
  55
  56         at91_system_clk_disable(ATMEL_PMC_UHP);
  57 #if defined(CONFIG_AT91SAM9261) || defined(CONFIG_AT91SAM9G10)
  58         at91_system_clk_disable(AT91_PMC_HCK0);
  59 #endif
  60
  61 #ifdef CONFIG_USB_ATMEL_CLK_SEL_PLLB
  62 #ifdef CONFIG_AT91SAM9N12
  63         writel(0, &pmc->usb);
  64 #endif
  65         /* Disable PLLB */
  66         writel(0, &pmc->pllbr);
  67         while ((readl(&pmc->sr) & AT91_PMC_LOCKB) != 0)
  68                 ;
  69 #elif defined(CONFIG_USB_ATMEL_CLK_SEL_UPLL)
  70         /* Disable UPLL */
  71         writel(readl(&pmc->uckr) & (~AT91_PMC_UPLLEN), &pmc->uckr);
  72         while ((readl(&pmc->sr) & AT91_PMC_LOCKU) == AT91_PMC_LOCKU)
  73                 ;
  74 #endif
  75
  76         return 0;
  77 }
  78
  79 int usb_cpu_init_fail(void)
  80 {
  81         return usb_cpu_stop();
  82 }
  83
  84 #endif /* defined(CONFIG_USB_OHCI) && defined(CONFIG_SYS_USB_OHCI_CPU_INIT) */