arch/arm/mach-omap2/usb-tusb6010.c - kernel/prism - Git at Google

 /*
  * 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/types.h>
 #include <linux/errno.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/gpio.h>

 #include <linux/usb/musb.h>

 #include <mach/gpmc.h>
 #include <mach/mux.h>


 static u8		async_cs, sync_cs;
 static unsigned		refclk_psec;


 /* t2_ps, when quantized to fclk units, must happen no earlier than
  * the clock after after t1_NS.
  *
  * Return a possibly updated value of t2_ps, converted to nsec.
  */
 static unsigned
 next_clk(unsigned t1_NS, unsigned t2_ps, unsigned fclk_ps)
 {
 	unsigned	t1_ps = t1_NS * 1000;
 	unsigned	t1_f, t2_f;

 	if ((t1_ps + fclk_ps) < t2_ps)
 		return t2_ps / 1000;

 	t1_f = (t1_ps + fclk_ps - 1) / fclk_ps;
 	t2_f = (t2_ps + fclk_ps - 1) / fclk_ps;

 	if (t1_f >= t2_f)
 		t2_f = t1_f + 1;

 	return (t2_f * fclk_ps) / 1000;
 }

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

 static int tusb_set_async_mode(unsigned sysclk_ps, unsigned fclk_ps)
 {
 	struct gpmc_timings	t;
 	unsigned		t_acsnh_advnh = sysclk_ps + 3000;
 	unsigned		tmp;

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

 	/* CS_ON = t_acsnh_acsnl */
 	t.cs_on = 8;
 	/* ADV_ON = t_acsnh_advnh - t_advn */
 	t.adv_on = next_clk(t.cs_on, t_acsnh_advnh - 7000, fclk_ps);

 	/*
 	 * READ ... from omap2420 TRM fig 12-13
 	 */

 	/* ADV_RD_OFF = t_acsnh_advnh */
 	t.adv_rd_off = next_clk(t.adv_on, t_acsnh_advnh, fclk_ps);

 	/* OE_ON = t_acsnh_advnh + t_advn_oen (then wait for nRDY) */
 	t.oe_on = next_clk(t.adv_on, t_acsnh_advnh + 1000, fclk_ps);

 	/* ACCESS = counters continue only after nRDY */
 	tmp = t.oe_on * 1000 + 300;
 	t.access = next_clk(t.oe_on, tmp, fclk_ps);

 	/* OE_OFF = after data gets sampled */
 	tmp = t.access * 1000;
 	t.oe_off = next_clk(t.access, tmp, fclk_ps);

 	t.cs_rd_off = t.oe_off;

 	tmp = t.cs_rd_off * 1000 + 7000 /* t_acsn_rdy_z */;
 	t.rd_cycle = next_clk(t.cs_rd_off, tmp, fclk_ps);

 	/*
 	 * WRITE ... from omap2420 TRM fig 12-15
 	 */

 	/* ADV_WR_OFF = t_acsnh_advnh */
 	t.adv_wr_off = t.adv_rd_off;

 	/* WE_ON = t_acsnh_advnh + t_advn_wen (then wait for nRDY) */
 	t.we_on = next_clk(t.adv_wr_off, t_acsnh_advnh + 1000, fclk_ps);

 	/* WE_OFF = after data gets sampled */
 	tmp = t.we_on * 1000 + 300;
 	t.we_off = next_clk(t.we_on, tmp, fclk_ps);

 	t.cs_wr_off = t.we_off;

 	tmp = t.cs_wr_off * 1000 + 7000 /* t_acsn_rdy_z */;
 	t.wr_cycle = next_clk(t.cs_wr_off, tmp, fclk_ps);

 	return gpmc_cs_set_timings(async_cs, &t);
 }

 static int tusb_set_sync_mode(unsigned sysclk_ps, unsigned fclk_ps)
 {
 	struct gpmc_timings	t;
 	unsigned		t_scsnh_advnh = sysclk_ps + 3000;
 	unsigned		tmp;

 	memset(&t, 0, sizeof(t));
 	t.cs_on = 8;

 	/* ADV_ON = t_acsnh_advnh - t_advn */
 	t.adv_on = next_clk(t.cs_on, t_scsnh_advnh - 7000, fclk_ps);

 	/* GPMC_CLK rate = fclk rate / div */
 	t.sync_clk = 12 /* 11.1 nsec */;
 	tmp = (t.sync_clk * 1000 + fclk_ps - 1) / fclk_ps;
 	if (tmp > 4)
 		return -ERANGE;
 	if (tmp <= 0)
 		tmp = 1;
 	t.page_burst_access = (fclk_ps * tmp) / 1000;

 	/*
 	 * READ ... based on omap2420 TRM fig 12-19, 12-20
 	 */

 	/* ADV_RD_OFF = t_scsnh_advnh */
 	t.adv_rd_off = next_clk(t.adv_on, t_scsnh_advnh, fclk_ps);

 	/* OE_ON = t_scsnh_advnh + t_advn_oen * fclk_ps (then wait for nRDY) */
 	tmp = (t.adv_rd_off * 1000) + (3 * fclk_ps);
 	t.oe_on = next_clk(t.adv_on, tmp, fclk_ps);

 	/* ACCESS = number of clock cycles after t_adv_eon */
 	tmp = (t.oe_on * 1000) + (5 * fclk_ps);
 	t.access = next_clk(t.oe_on, tmp, fclk_ps);

 	/* OE_OFF = after data gets sampled */
 	tmp = (t.access * 1000) + (1 * fclk_ps);
 	t.oe_off = next_clk(t.access, tmp, fclk_ps);

 	t.cs_rd_off = t.oe_off;

 	tmp = t.cs_rd_off * 1000 + 7000 /* t_scsn_rdy_z */;
 	t.rd_cycle = next_clk(t.cs_rd_off, tmp, fclk_ps);

 	/*
 	 * WRITE ... based on omap2420 TRM fig 12-21
 	 */

 	/* ADV_WR_OFF = t_scsnh_advnh */
 	t.adv_wr_off = t.adv_rd_off;

 	/* WE_ON = t_scsnh_advnh + t_advn_wen * fclk_ps (then wait for nRDY) */
 	tmp = (t.adv_wr_off * 1000) + (3 * fclk_ps);
 	t.we_on = next_clk(t.adv_wr_off, tmp, fclk_ps);

 	/* WE_OFF = number of clock cycles after t_adv_wen */
 	tmp = (t.we_on * 1000) + (6 * fclk_ps);
 	t.we_off = next_clk(t.we_on, tmp, fclk_ps);

 	t.cs_wr_off = t.we_off;

 	tmp = t.cs_wr_off * 1000 + 7000 /* t_scsn_rdy_z */;
 	t.wr_cycle = next_clk(t.cs_wr_off, tmp, fclk_ps);

 	return gpmc_cs_set_timings(sync_cs, &t);
 }

 extern unsigned long gpmc_get_fclk_period(void);

 /* 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	fclk_ps = gpmc_get_fclk_period();
 	unsigned	sysclk_ps;
 	int		status;

 	if (!refclk_psec || fclk_ps == 0)
 		return -ENODEV;

 	sysclk_ps = is_refclk ? refclk_psec : TUSB6010_OSCCLK_60;

 	status = tusb_set_async_mode(sysclk_ps, fclk_ps);
 	if (status < 0) {
 		printk(error, "async", status);
 		goto done;
 	}
 	status = tusb_set_sync_mode(sysclk_ps, fclk_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 */
 		.flags	= IORESOURCE_IRQ,
 	},
 };

 static u64 tusb_dmamask = ~(u32)0;

 static struct platform_device tusb_device = {
 	.name		= "musb_hdrc",
 	.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;
 	async_cs = async;
 	gpmc_cs_write_reg(async, GPMC_CS_CONFIG1,
 			  GPMC_CONFIG1_PAGE_LEN(2)
 			| GPMC_CONFIG1_WAIT_READ_MON
 			| GPMC_CONFIG1_WAIT_WRITE_MON
 			| GPMC_CONFIG1_WAIT_PIN_SEL(waitpin)
 			| GPMC_CONFIG1_READTYPE_ASYNC
 			| GPMC_CONFIG1_WRITETYPE_ASYNC
 			| GPMC_CONFIG1_DEVICESIZE_16
 			| GPMC_CONFIG1_DEVICETYPE_NOR
 			| GPMC_CONFIG1_MUXADDDATA);


 	/* 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;
 	sync_cs = sync;
 	gpmc_cs_write_reg(sync, GPMC_CS_CONFIG1,
 			  GPMC_CONFIG1_READMULTIPLE_SUPP
 			| GPMC_CONFIG1_READTYPE_SYNC
 			| GPMC_CONFIG1_WRITEMULTIPLE_SUPP
 			| GPMC_CONFIG1_WRITETYPE_SYNC
 			| GPMC_CONFIG1_CLKACTIVATIONTIME(1)
 			| GPMC_CONFIG1_PAGE_LEN(2)
 			| GPMC_CONFIG1_WAIT_READ_MON
 			| GPMC_CONFIG1_WAIT_WRITE_MON
 			| GPMC_CONFIG1_WAIT_PIN_SEL(waitpin)
 			| GPMC_CONFIG1_DEVICESIZE_16
 			| GPMC_CONFIG1_DEVICETYPE_NOR
 			| GPMC_CONFIG1_MUXADDDATA
 			/* fclk divider gets set later */
 			);

 	/* IRQ */
 	status = gpio_request(irq, "TUSB6010 irq");
 	if (status < 0) {
 		printk(error, 3, status);
 		return status;
 	}
 	gpio_direction_input(irq);
 	tusb_resources[2].start = irq + IH_GPIO_BASE;

 	/* 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_cfg_reg(AA10_242X_DMAREQ0);
 		if (dmachan & (1 << 1))
 			omap_cfg_reg(AA6_242X_DMAREQ1);
 		if (dmachan & (1 << 2))
 			omap_cfg_reg(E4_242X_DMAREQ2);
 		if (dmachan & (1 << 3))
 			omap_cfg_reg(G4_242X_DMAREQ3);
 		if (dmachan & (1 << 4))
 			omap_cfg_reg(D3_242X_DMAREQ4);
 		if (dmachan & (1 << 5))
 			omap_cfg_reg(E3_242X_DMAREQ5);
 	}

 	/* so far so good ... register the device */
 	status = platform_device_register(&tusb_device);
 	if (status < 0) {
 		printk(error, 7, status);
 		return status;
 	}
 	return 0;
 }
	/*
	* 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/types.h>
	#include <linux/errno.h>
	#include <linux/delay.h>
	#include <linux/platform_device.h>
	#include <linux/gpio.h>

	#include <linux/usb/musb.h>

	#include <mach/gpmc.h>
	#include <mach/mux.h>


	static u8 async_cs, sync_cs;
	static unsigned refclk_psec;


	/* t2_ps, when quantized to fclk units, must happen no earlier than
	* the clock after after t1_NS.
	*
	* Return a possibly updated value of t2_ps, converted to nsec.
	*/
	static unsigned
	next_clk(unsigned t1_NS, unsigned t2_ps, unsigned fclk_ps)
	{
	unsigned t1_ps = t1_NS * 1000;
	unsigned t1_f, t2_f;

	if ((t1_ps + fclk_ps) < t2_ps)
	return t2_ps / 1000;

	t1_f = (t1_ps + fclk_ps - 1) / fclk_ps;
	t2_f = (t2_ps + fclk_ps - 1) / fclk_ps;

	if (t1_f >= t2_f)
	t2_f = t1_f + 1;

	return (t2_f * fclk_ps) / 1000;
	}

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

	static int tusb_set_async_mode(unsigned sysclk_ps, unsigned fclk_ps)
	{
	struct gpmc_timings t;
	unsigned t_acsnh_advnh = sysclk_ps + 3000;
	unsigned tmp;

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

	/* CS_ON = t_acsnh_acsnl */
	t.cs_on = 8;
	/* ADV_ON = t_acsnh_advnh - t_advn */
	t.adv_on = next_clk(t.cs_on, t_acsnh_advnh - 7000, fclk_ps);

	/*
	* READ ... from omap2420 TRM fig 12-13
	*/

	/* ADV_RD_OFF = t_acsnh_advnh */
	t.adv_rd_off = next_clk(t.adv_on, t_acsnh_advnh, fclk_ps);

	/* OE_ON = t_acsnh_advnh + t_advn_oen (then wait for nRDY) */
	t.oe_on = next_clk(t.adv_on, t_acsnh_advnh + 1000, fclk_ps);

	/* ACCESS = counters continue only after nRDY */
	tmp = t.oe_on * 1000 + 300;
	t.access = next_clk(t.oe_on, tmp, fclk_ps);

	/* OE_OFF = after data gets sampled */
	tmp = t.access * 1000;
	t.oe_off = next_clk(t.access, tmp, fclk_ps);

	t.cs_rd_off = t.oe_off;

	tmp = t.cs_rd_off * 1000 + 7000 /* t_acsn_rdy_z */;
	t.rd_cycle = next_clk(t.cs_rd_off, tmp, fclk_ps);

	/*
	* WRITE ... from omap2420 TRM fig 12-15
	*/

	/* ADV_WR_OFF = t_acsnh_advnh */
	t.adv_wr_off = t.adv_rd_off;

	/* WE_ON = t_acsnh_advnh + t_advn_wen (then wait for nRDY) */
	t.we_on = next_clk(t.adv_wr_off, t_acsnh_advnh + 1000, fclk_ps);

	/* WE_OFF = after data gets sampled */
	tmp = t.we_on * 1000 + 300;
	t.we_off = next_clk(t.we_on, tmp, fclk_ps);

	t.cs_wr_off = t.we_off;

	tmp = t.cs_wr_off * 1000 + 7000 /* t_acsn_rdy_z */;
	t.wr_cycle = next_clk(t.cs_wr_off, tmp, fclk_ps);

	return gpmc_cs_set_timings(async_cs, &t);
	}

	static int tusb_set_sync_mode(unsigned sysclk_ps, unsigned fclk_ps)
	{
	struct gpmc_timings t;
	unsigned t_scsnh_advnh = sysclk_ps + 3000;
	unsigned tmp;

	memset(&t, 0, sizeof(t));
	t.cs_on = 8;

	/* ADV_ON = t_acsnh_advnh - t_advn */
	t.adv_on = next_clk(t.cs_on, t_scsnh_advnh - 7000, fclk_ps);

	/* GPMC_CLK rate = fclk rate / div */
	t.sync_clk = 12 /* 11.1 nsec */;
	tmp = (t.sync_clk * 1000 + fclk_ps - 1) / fclk_ps;
	if (tmp > 4)
	return -ERANGE;
	if (tmp <= 0)
	tmp = 1;
	t.page_burst_access = (fclk_ps * tmp) / 1000;

	/*
	* READ ... based on omap2420 TRM fig 12-19, 12-20
	*/

	/* ADV_RD_OFF = t_scsnh_advnh */
	t.adv_rd_off = next_clk(t.adv_on, t_scsnh_advnh, fclk_ps);

	/* OE_ON = t_scsnh_advnh + t_advn_oen * fclk_ps (then wait for nRDY) */
	tmp = (t.adv_rd_off * 1000) + (3 * fclk_ps);
	t.oe_on = next_clk(t.adv_on, tmp, fclk_ps);

	/* ACCESS = number of clock cycles after t_adv_eon */
	tmp = (t.oe_on * 1000) + (5 * fclk_ps);
	t.access = next_clk(t.oe_on, tmp, fclk_ps);

	/* OE_OFF = after data gets sampled */
	tmp = (t.access * 1000) + (1 * fclk_ps);
	t.oe_off = next_clk(t.access, tmp, fclk_ps);

	t.cs_rd_off = t.oe_off;

	tmp = t.cs_rd_off * 1000 + 7000 /* t_scsn_rdy_z */;
	t.rd_cycle = next_clk(t.cs_rd_off, tmp, fclk_ps);

	/*
	* WRITE ... based on omap2420 TRM fig 12-21
	*/

	/* ADV_WR_OFF = t_scsnh_advnh */
	t.adv_wr_off = t.adv_rd_off;

	/* WE_ON = t_scsnh_advnh + t_advn_wen * fclk_ps (then wait for nRDY) */
	tmp = (t.adv_wr_off * 1000) + (3 * fclk_ps);
	t.we_on = next_clk(t.adv_wr_off, tmp, fclk_ps);

	/* WE_OFF = number of clock cycles after t_adv_wen */
	tmp = (t.we_on * 1000) + (6 * fclk_ps);
	t.we_off = next_clk(t.we_on, tmp, fclk_ps);

	t.cs_wr_off = t.we_off;

	tmp = t.cs_wr_off * 1000 + 7000 /* t_scsn_rdy_z */;
	t.wr_cycle = next_clk(t.cs_wr_off, tmp, fclk_ps);

	return gpmc_cs_set_timings(sync_cs, &t);
	}

	extern unsigned long gpmc_get_fclk_period(void);

	/* 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 fclk_ps = gpmc_get_fclk_period();
	unsigned sysclk_ps;
	int status;

	if (!refclk_psec \|\| fclk_ps == 0)
	return -ENODEV;

	sysclk_ps = is_refclk ? refclk_psec : TUSB6010_OSCCLK_60;

	status = tusb_set_async_mode(sysclk_ps, fclk_ps);
	if (status < 0) {
	printk(error, "async", status);
	goto done;
	}
	status = tusb_set_sync_mode(sysclk_ps, fclk_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 */
	.flags = IORESOURCE_IRQ,
	},
	};

	static u64 tusb_dmamask = ~(u32)0;

	static struct platform_device tusb_device = {
	.name = "musb_hdrc",
	.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;
	async_cs = async;
	gpmc_cs_write_reg(async, GPMC_CS_CONFIG1,
	GPMC_CONFIG1_PAGE_LEN(2)
	\| GPMC_CONFIG1_WAIT_READ_MON
	\| GPMC_CONFIG1_WAIT_WRITE_MON
	\| GPMC_CONFIG1_WAIT_PIN_SEL(waitpin)
	\| GPMC_CONFIG1_READTYPE_ASYNC
	\| GPMC_CONFIG1_WRITETYPE_ASYNC
	\| GPMC_CONFIG1_DEVICESIZE_16
	\| GPMC_CONFIG1_DEVICETYPE_NOR
	\| GPMC_CONFIG1_MUXADDDATA);


	/* 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;
	sync_cs = sync;
	gpmc_cs_write_reg(sync, GPMC_CS_CONFIG1,
	GPMC_CONFIG1_READMULTIPLE_SUPP
	\| GPMC_CONFIG1_READTYPE_SYNC
	\| GPMC_CONFIG1_WRITEMULTIPLE_SUPP
	\| GPMC_CONFIG1_WRITETYPE_SYNC
	\| GPMC_CONFIG1_CLKACTIVATIONTIME(1)
	\| GPMC_CONFIG1_PAGE_LEN(2)
	\| GPMC_CONFIG1_WAIT_READ_MON
	\| GPMC_CONFIG1_WAIT_WRITE_MON
	\| GPMC_CONFIG1_WAIT_PIN_SEL(waitpin)
	\| GPMC_CONFIG1_DEVICESIZE_16
	\| GPMC_CONFIG1_DEVICETYPE_NOR
	\| GPMC_CONFIG1_MUXADDDATA
	/* fclk divider gets set later */
	);

	/* IRQ */
	status = gpio_request(irq, "TUSB6010 irq");
	if (status < 0) {
	printk(error, 3, status);
	return status;
	}
	gpio_direction_input(irq);
	tusb_resources[2].start = irq + IH_GPIO_BASE;

	/* 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_cfg_reg(AA10_242X_DMAREQ0);
	if (dmachan & (1 << 1))
	omap_cfg_reg(AA6_242X_DMAREQ1);
	if (dmachan & (1 << 2))
	omap_cfg_reg(E4_242X_DMAREQ2);
	if (dmachan & (1 << 3))
	omap_cfg_reg(G4_242X_DMAREQ3);
	if (dmachan & (1 << 4))
	omap_cfg_reg(D3_242X_DMAREQ4);
	if (dmachan & (1 << 5))
	omap_cfg_reg(E3_242X_DMAREQ5);
	}

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