xref: /kernel/linux/linux-5.10/arch/arm/mach-omap2/usb-tusb6010.c

// 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/gpio.h>
#include <linux/export.h>
#include <linux/platform_data/usb-omap.h>

#include <linux/usb/musb.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;
	dev_t.cyc_aavdh_we = 3;
	dev_t.cyc_wpl = 6;

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

	return gpmc_cs_set_timings(sync_cs, &t, &tusb_sync);
}

/* tusb driver calls this when it changes the chip's clocking */
int tusb6010_platform_retime(unsigned is_refclk)
{
	static const char	error[] =
		KERN_ERR "tusb6010 %s retime error %d\n";

	unsigned	sysclk_ps;
	int		status;

	if (!refclk_psec)
		return -ENODEV;

	sysclk_ps = is_refclk ? refclk_psec : TUSB6010_OSCCLK_60;

	status = tusb_set_async_mode(sysclk_ps);
	if (status < 0) {
		printk(error, "async", status);
		goto done;
	}
	status = tusb_set_sync_mode(sysclk_ps);
	if (status < 0)
		printk(error, "sync", status);
done:
	return status;
}
EXPORT_SYMBOL_GPL(tusb6010_platform_retime);

static struct resource tusb_resources[] = {
	/* Order is significant!  The start/end fields
	 * are updated during setup..
	 */
	{ /* Asynchronous access */
		.flags	= IORESOURCE_MEM,
	},
	{ /* Synchronous access */
		.flags	= IORESOURCE_MEM,
	},
	{ /* IRQ */
		.name	= "mc",
		.flags	= IORESOURCE_IRQ,
	},
};

static u64 tusb_dmamask = ~(u32)0;

static struct platform_device tusb_device = {
	.name		= "musb-tusb",
	.id		= -1,
	.dev = {
		.dma_mask		= &tusb_dmamask,
		.coherent_dma_mask	= 0xffffffff,
	},
	.num_resources	= ARRAY_SIZE(tusb_resources),
	.resource	= tusb_resources,
};


/* this may be called only from board-*.c setup code */
int __init
tusb6010_setup_interface(struct musb_hdrc_platform_data *data,
		unsigned ps_refclk, unsigned waitpin,
		unsigned async, unsigned sync,
		unsigned irq, unsigned dmachan)
{
	int		status;
	static char	error[] __initdata =
		KERN_ERR "tusb6010 init error %d, %d\n";

	/* ASYNC region, primarily for PIO */
	status = gpmc_cs_request(async, SZ_16M, (unsigned long *)
				&tusb_resources[0].start);
	if (status < 0) {
		printk(error, 1, status);
		return status;
	}
	tusb_resources[0].end = tusb_resources[0].start + 0x9ff;
	tusb_async.wait_pin = waitpin;
	async_cs = async;

	status = gpmc_cs_program_settings(async_cs, &tusb_async);
	if (status < 0)
		return status;

	/* SYNC region, primarily for DMA */
	status = gpmc_cs_request(sync, SZ_16M, (unsigned long *)
				&tusb_resources[1].start);
	if (status < 0) {
		printk(error, 2, status);
		return status;
	}
	tusb_resources[1].end = tusb_resources[1].start + 0x9ff;
	tusb_sync.wait_pin = waitpin;
	sync_cs = sync;

	status = gpmc_cs_program_settings(sync_cs, &tusb_sync);
	if (status < 0)
		return status;

	/* IRQ */
	status = gpio_request_one(irq, GPIOF_IN, "TUSB6010 irq");
	if (status < 0) {
		printk(error, 3, status);
		return status;
	}
	tusb_resources[2].start = gpio_to_irq(irq);

	/* set up memory timings ... can speed them up later */
	if (!ps_refclk) {
		printk(error, 4, status);
		return -ENODEV;
	}
	refclk_psec = ps_refclk;
	status = tusb6010_platform_retime(1);
	if (status < 0) {
		printk(error, 5, status);
		return status;
	}

	/* finish device setup ... */
	if (!data) {
		printk(error, 6, status);
		return -ENODEV;
	}
	tusb_device.dev.platform_data = data;

	/* so far so good ... register the device */
	status = platform_device_register(&tusb_device);
	if (status < 0) {
		printk(error, 7, status);
		return status;
	}
	return 0;
}