/*
   * linux/arch/arm/mach-omap2/usb-tusb6010.c
   *
   * Copyright (C) 2006 Nokia Corporation
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #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"
  
  #include "mux.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);
  }
  
  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;
  	dev_t.t_ce_rdyz = 7000;
  
  	gpmc_calc_timings(&t, &tusb_sync, &dev_t);
  
  	return gpmc_cs_set_timings(sync_cs, &t);
  }
  
  /* 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
  ";
  
  	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
  ";
  
  	/* 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;
  
  	/* REVISIT let the driver know what DMA channels work */
  	if (!dmachan)
  		tusb_device.dev.dma_mask = NULL;
  	else {
  		/* assume OMAP 2420 ES2.0 and later */
  		if (dmachan & (1 << 0))
  			omap_mux_init_signal("sys_ndmareq0", 0);
  		if (dmachan & (1 << 1))
  			omap_mux_init_signal("sys_ndmareq1", 0);
  		if (dmachan & (1 << 2))
  			omap_mux_init_signal("sys_ndmareq2", 0);
  		if (dmachan & (1 << 3))
  			omap_mux_init_signal("sys_ndmareq3", 0);
  		if (dmachan & (1 << 4))
  			omap_mux_init_signal("sys_ndmareq4", 0);
  		if (dmachan & (1 << 5))
  			omap_mux_init_signal("sys_ndmareq5", 0);
  	}
  
  	/* so far so good ... register the device */
  	status = platform_device_register(&tusb_device);
  	if (status < 0) {
  		printk(error, 7, status);
  		return status;
  	}
  	return 0;
  }