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/*
* 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"
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;
}
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