arch/arm/mach-omap2/usb-tusb6010.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-omap2/usb-tusb6010.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-omap2/usb-tusb6010.c
Extension
.c
Size
5075 bytes
Lines
218
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * linux/arch/arm/mach-omap2/usb-tusb6010.c
 *
 * Copyright (C) 2006 Nokia Corporation
 */

#include <linux/err.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/export.h>
#include <linux/platform_data/usb-omap.h>

#include <linux/usb/musb.h>

#include "usb-tusb6010.h"
#include "gpmc.h"

static u8		async_cs, sync_cs;
static unsigned		refclk_psec;

static struct gpmc_settings tusb_async = {
	.wait_on_read	= true,
	.wait_on_write	= true,
	.device_width	= GPMC_DEVWIDTH_16BIT,
	.mux_add_data	= GPMC_MUX_AD,
};

static struct gpmc_settings tusb_sync = {
	.burst_read	= true,
	.burst_write	= true,
	.sync_read	= true,
	.sync_write	= true,
	.wait_on_read	= true,
	.wait_on_write	= true,
	.burst_len	= GPMC_BURST_16,
	.device_width	= GPMC_DEVWIDTH_16BIT,
	.mux_add_data	= GPMC_MUX_AD,
};

/* NOTE:  timings are from tusb 6010 datasheet Rev 1.8, 12-Sept 2006 */

static int tusb_set_async_mode(unsigned sysclk_ps)
{
	struct gpmc_device_timings dev_t;
	struct gpmc_timings	t;
	unsigned		t_acsnh_advnh = sysclk_ps + 3000;

	memset(&dev_t, 0, sizeof(dev_t));

	dev_t.t_ceasu = 8 * 1000;
	dev_t.t_avdasu = t_acsnh_advnh - 7000;
	dev_t.t_ce_avd = 1000;
	dev_t.t_avdp_r = t_acsnh_advnh;
	dev_t.t_oeasu = t_acsnh_advnh + 1000;
	dev_t.t_oe = 300;
	dev_t.t_cez_r = 7000;
	dev_t.t_cez_w = dev_t.t_cez_r;
	dev_t.t_avdp_w = t_acsnh_advnh;
	dev_t.t_weasu = t_acsnh_advnh + 1000;
	dev_t.t_wpl = 300;
	dev_t.cyc_aavdh_we = 1;

	gpmc_calc_timings(&t, &tusb_async, &dev_t);

	return gpmc_cs_set_timings(async_cs, &t, &tusb_async);
}

static int tusb_set_sync_mode(unsigned sysclk_ps)
{
	struct gpmc_device_timings dev_t;
	struct gpmc_timings	t;
	unsigned		t_scsnh_advnh = sysclk_ps + 3000;

	memset(&dev_t, 0, sizeof(dev_t));

	dev_t.clk = 11100;
	dev_t.t_bacc = 1000;
	dev_t.t_ces = 1000;
	dev_t.t_ceasu = 8 * 1000;
	dev_t.t_avdasu = t_scsnh_advnh - 7000;
	dev_t.t_ce_avd = 1000;
	dev_t.t_avdp_r = t_scsnh_advnh;
	dev_t.cyc_aavdh_oe = 3;
	dev_t.cyc_oe = 5;
	dev_t.t_ce_rdyz = 7000;
	dev_t.t_avdp_w = t_scsnh_advnh;

Annotation

Implementation Notes