xref: /optee_os/core/drivers/clk/sam/at91_usb.c (revision 7bf8a43b1a3900e9fe10c1fe264cbc9831bbe8ce)

// SPDX-License-Identifier: GPL-2.0+ or BSD-3-Clause
/*
 *  Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
 *  Copyright (C) 2021 Microchip
 */

#include <io.h>
#include <kernel/delay.h>
#include <kernel/panic.h>
#include <mm/core_memprot.h>
#include <types_ext.h>

#include "at91_clk.h"

#define SAM9X5_USB_DIV_SHIFT	8
#define SAM9X5_USB_DIV_COUNT	BIT32(4)
#define SAM9X5_USB_MAX_DIV	(SAM9X5_USB_DIV_COUNT - 1)

#define SAM9X5_USBS_MASK	BIT(0)

struct at91sam9x5_clk_usb {
	vaddr_t base;
	uint32_t usbs_mask;
};

static unsigned long at91sam9x5_clk_usb_get_rate(struct clk *clk,
						 unsigned long parent_rate)
{
	struct at91sam9x5_clk_usb *usb = clk->priv;
	uint8_t usbdiv = 1;
	unsigned int usbr = io_read32(usb->base + AT91_PMC_USB);

	usbdiv = (usbr & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT;

	return UDIV_ROUND_NEAREST(parent_rate, (usbdiv + 1));
}

static TEE_Result at91sam9x5_clk_usb_set_parent(struct clk *clk, size_t index)
{
	struct at91sam9x5_clk_usb *usb = clk->priv;

	if (index >= clk_get_num_parents(clk))
		return TEE_ERROR_BAD_PARAMETERS;

	io_clrsetbits32(usb->base + AT91_PMC_USB, usb->usbs_mask, index);

	return TEE_SUCCESS;
}

static size_t at91sam9x5_clk_usb_get_parent(struct clk *clk)
{
	struct at91sam9x5_clk_usb *usb = clk->priv;
	unsigned int usbr = io_read32(usb->base + AT91_PMC_USB);

	return usbr & usb->usbs_mask;
}

static TEE_Result at91sam9x5_clk_usb_set_rate(struct clk *clk,
					      unsigned long rate,
					      unsigned long parent_rate)
{
	struct at91sam9x5_clk_usb *usb = clk->priv;
	unsigned long div = 1;

	if (!rate)
		return TEE_ERROR_BAD_PARAMETERS;

	div = UDIV_ROUND_NEAREST(parent_rate, rate);
	if (div > SAM9X5_USB_MAX_DIV + 1 || !div)
		return TEE_ERROR_BAD_PARAMETERS;

	io_clrsetbits32(usb->base + AT91_PMC_USB, AT91_PMC_OHCIUSBDIV,
			(div - 1) << SAM9X5_USB_DIV_SHIFT);

	return TEE_SUCCESS;
}

static const struct clk_ops at91sam9x5_usb_ops = {
	.get_rate = at91sam9x5_clk_usb_get_rate,
	.get_parent = at91sam9x5_clk_usb_get_parent,
	.set_parent = at91sam9x5_clk_usb_set_parent,
	.set_rate = at91sam9x5_clk_usb_set_rate,
};

static struct clk *
_at91sam9x5_clk_register_usb(struct pmc_data *pmc, const char *name,
			     struct clk **parents, uint8_t num_parents,
			     uint32_t usbs_mask)
{
	struct at91sam9x5_clk_usb *usb = NULL;
	struct clk *clk = NULL;

	clk = clk_alloc(name, &at91sam9x5_usb_ops, parents, num_parents);
	if (!clk)
		return NULL;

	usb = calloc(1, sizeof(*usb));
	if (!usb)
		return NULL;

	usb->base = pmc->base;
	usb->usbs_mask = usbs_mask;

	clk->priv = usb;
	clk->flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;

	if (clk_register(clk)) {
		clk_free(clk);
		free(usb);
		return NULL;
	}

	return clk;
}

struct clk *
at91sam9x5_clk_register_usb(struct pmc_data *pmc, const char *name,
			    struct clk **parents, uint8_t num_parents)
{
	return _at91sam9x5_clk_register_usb(pmc, name, parents,
					    num_parents, SAM9X5_USBS_MASK);
}