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/*
* arch/ubicom32/mach-common/usb_tio.c
* Linux side Ubicom USB TIO driver
*
* (C) Copyright 2009, Ubicom, Inc.
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port is free software: you can redistribute
* it and/or modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 2 of the
* License, or (at your option) any later version.
*
* The Ubicom32 Linux Kernel Port is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*
* Ubicom32 implementation derived from (with many thanks):
* arch/m68knommu
* arch/blackfin
* arch/parisc
*/
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <asm/devtree.h>
#include "usb_tio.h"
#ifdef CONFIG_SMP
static DEFINE_SPINLOCK(tio_lock);
#define USB_TIO_LOCK(lock, flag) spin_lock_irqsave(lock, flag)
#define USB_TIO_UNLOCK(lock, flag) spin_unlock_irqrestore(lock, flag)
#define USB_TIO_LOCK_ISLOCKED(lock) spin_try_lock(lock)
#else
#define USB_TIO_LOCK(lock, flag) local_irq_save(flag)
#define USB_TIO_UNLOCK(lock, flag) local_irq_restore(flag)
#endif
spinlock_t usb_tio_lock;
/*
* usb_tio_set_hrt_interrupt()
*/
static inline void usb_tio_set_hrt_interrupt(void)
{
ubicom32_set_interrupt(usb_node->dn.sendirq);
}
static inline void usb_tio_wait_hrt(void)
{
while (unlikely(usb_node->pdesc));
}
#if defined(USB_TIO_DEBUG)
static void usb_tio_request_verify_magic(volatile struct usb_tio_request *req)
{
BUG_ON(req->magic != USB_TIO_REQUEST_MAGIC2);
}
static void usb_tio_request_clear_magic(volatile struct usb_tio_request *req)
{
req->magic = 0;
}
#endif
static void usb_tio_request_set_magic(volatile struct usb_tio_request *req)
{
req->magic = USB_TIO_REQUEST_MAGIC1;
}
/*
* usb_tio_commit_request()
*/
static inline void usb_tio_commit_request(volatile struct usb_tio_request *request)
{
wmb();
usb_node->pdesc = request;
/*
* next thing to do is alway checking if (usb_node->pdesc == NULL)
* to see if the request is done, so add a mb() here
*/
mb();
usb_tio_set_hrt_interrupt();
}
/*
* usb_tio_read_u16()
* Synchronously read 16 bits.
*/
u8_t usb_tio_read_u16(u32_t address, u16_t *data)
{
volatile struct usb_tio_request *tio_req = &usb_node->request;
unsigned long flag;
/*
* Wait for any previous request to complete and then make this request.
*/
USB_TIO_LOCK(&tio_lock, flag);
usb_tio_wait_hrt();
/*
* Fill in the request.
*/
tio_req->address = address;
tio_req->cmd = USB_TIO_READ16_SYNC;
USB_TIO_REQUEST_SET_MAGIC(tio_req);
usb_tio_commit_request(tio_req);
/*
* Wait for the result to show up.
*/
usb_tio_wait_hrt();
USB_TIO_REQUEST_VERIFY_MAGIC(tio_req);
*data = (u16_t)tio_req->data;
USB_TIO_REQUEST_CLEAR_MAGIC(tio_req);
USB_TIO_UNLOCK(&tio_lock, flag);
return USB_TIO_OK;
}
/*
* usb_tio_read_u8()
* Synchronously read 16 bits.
*/
u8_t usb_tio_read_u8(u32_t address, u8_t *data)
{
volatile struct usb_tio_request *tio_req = &usb_node->request;
unsigned long flag;
/*
* Wait for any previous request to complete and then make this request.
*/
USB_TIO_LOCK(&tio_lock, flag);
usb_tio_wait_hrt();
/*
* Fill in the request.
*/
tio_req->address = address;
tio_req->cmd = USB_TIO_READ8_SYNC;
USB_TIO_REQUEST_SET_MAGIC(tio_req);
/*
* commit the request
*/
usb_tio_commit_request(tio_req);
/*
* Wait for the result to show up.
*/
usb_tio_wait_hrt();
USB_TIO_REQUEST_VERIFY_MAGIC(tio_req);
*data = (u8_t)tio_req->data;
USB_TIO_REQUEST_CLEAR_MAGIC(tio_req);
USB_TIO_UNLOCK(&tio_lock, flag);
return USB_TIO_OK;
}
/*
* usb_tio_write_u16()
* Asynchronously write 16 bits.
*/
u8_t usb_tio_write_u16(u32_t address, u16_t data)
{
volatile struct usb_tio_request *tio_req = &usb_node->request;
unsigned long flag;
/*
* Wait for any previous write or pending read to complete.
*/
USB_TIO_LOCK(&tio_lock, flag);
usb_tio_wait_hrt();
tio_req->address = address;
tio_req->data = data;
tio_req->cmd = USB_TIO_WRITE16_ASYNC;
USB_TIO_REQUEST_SET_MAGIC(tio_req);
/*
* commit the request
*/
usb_tio_commit_request(tio_req);
USB_TIO_UNLOCK(&tio_lock, flag);
return USB_TIO_OK;
}
/*
* usb_tio_write_u8()
* Asynchronously write 8 bits.
*/
u8_t usb_tio_write_u8(u32_t address, u8_t data)
{
volatile struct usb_tio_request *tio_req = &usb_node->request;
unsigned long flag;
/*
* Wait for any previous write or pending read to complete.
*/
USB_TIO_LOCK(&tio_lock, flag);
usb_tio_wait_hrt();
tio_req->address = address;
tio_req->data = data;
tio_req->cmd = USB_TIO_WRITE8_ASYNC;
USB_TIO_REQUEST_SET_MAGIC(tio_req);
/*
* commit the request
*/
usb_tio_commit_request(tio_req);
USB_TIO_UNLOCK(&tio_lock, flag);
return USB_TIO_OK;
}
/*
* usb_tio_read_fifo()
* Synchronously read FIFO.
*/
u8_t usb_tio_read_fifo(u32_t address, u32_t buffer, u32_t bytes)
{
volatile struct usb_tio_request *tio_req = &usb_node->request;
unsigned long flag;
/*
* Wait for any previous request to complete and then make this request.
*/
USB_TIO_LOCK(&tio_lock, flag);
usb_tio_wait_hrt();
/*
* Fill in the request.
*/
tio_req->address = address;
tio_req->cmd = USB_TIO_READ_FIFO_SYNC;
tio_req->buffer = buffer;
tio_req->transfer_length = bytes;
USB_TIO_REQUEST_SET_MAGIC(tio_req);
/*
* commit the request
*/
usb_tio_commit_request(tio_req);
/*
* Wait for the result to show up.
*/
usb_tio_wait_hrt();
USB_TIO_REQUEST_VERIFY_MAGIC(tio_req);
USB_TIO_REQUEST_CLEAR_MAGIC(tio_req);
USB_TIO_UNLOCK(&tio_lock, flag);
return USB_TIO_OK;
}
/*
* usb_tio_write_fifo()
* Synchronously write 32 bits.
*/
u8_t usb_tio_write_fifo(u32_t address, u32_t buffer, u32_t bytes)
{
volatile struct usb_tio_request *tio_req = &usb_node->request;
unsigned long flag;
USB_TIO_LOCK(&tio_lock, flag);
usb_tio_wait_hrt();
tio_req->address = address;
tio_req->buffer = buffer;
tio_req->cmd = USB_TIO_WRITE_FIFO_SYNC;
tio_req->transfer_length = bytes;
USB_TIO_REQUEST_SET_MAGIC(tio_req);
/*
* commit the request
*/
usb_tio_commit_request(tio_req);
/*
* Wait for the result to show up.
*/
usb_tio_wait_hrt();
USB_TIO_REQUEST_VERIFY_MAGIC(tio_req);
USB_TIO_REQUEST_CLEAR_MAGIC(tio_req);
USB_TIO_UNLOCK(&tio_lock, flag);
return USB_TIO_OK;
}
/*
* usb_tio_write_fifo_async()
* Asynchronously write 32 bits.
*/
u8_t usb_tio_write_fifo_async(u32_t address, u32_t buffer, u32_t bytes)
{
volatile struct usb_tio_request *tio_req = &usb_node->request;
unsigned long flag;
USB_TIO_LOCK(&tio_lock, flag);
usb_tio_wait_hrt();
tio_req->address = address;
/*
* Is it necessary to make a local copy of the buffer? Any chance the URB is aborted before TIO finished the FIFO write?
*/
tio_req->buffer = buffer;
tio_req->cmd = USB_TIO_WRITE_FIFO_SYNC;
tio_req->transfer_length = bytes;
USB_TIO_REQUEST_SET_MAGIC(tio_req);
/*
* commit the request
*/
usb_tio_commit_request(tio_req);
USB_TIO_UNLOCK(&tio_lock, flag);
return USB_TIO_OK;
}
/*
* usb_tio_read_int_status()
* read and clear the interrupt status registers
*/
void usb_tio_read_int_status(u8_t *int_usb, u16_t *int_tx, u16_t *int_rx)
{
/*
* clear the interrupt must be syncronized with the TIO thread to prevent the racing condiiton
* that TIO thread try to set it at same time
*/
asm volatile (
"1: bset (%0), (%0), #0 \n\t" \
" jmpne.f 1b \n\t" \
:
: "a" (&usb_node->usb_vp_control)
: "memory", "cc"
);
*int_usb = usb_node->usb_vp_hw_int_usb;
*int_tx = cpu_to_le16(usb_node->usb_vp_hw_int_tx);
*int_rx = cpu_to_le16(usb_node->usb_vp_hw_int_rx);
//printk(KERN_INFO "int read %x, %x, %x\n", *int_usb, *int_tx, *int_rx);
/*
* The interrupt status register is read-clean, so clear it now
*/
usb_node->usb_vp_hw_int_usb = 0;
usb_node->usb_vp_hw_int_tx = 0;
usb_node->usb_vp_hw_int_rx = 0;
/*
* release the lock bit
*/
usb_node->usb_vp_control &= 0xfffe;
}
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