diff options
Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/mach-common/usb_tio.c')
| -rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/mach-common/usb_tio.c | 356 |
1 files changed, 356 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/mach-common/usb_tio.c b/target/linux/ubicom32/files/arch/ubicom32/mach-common/usb_tio.c new file mode 100644 index 000000000..95ace6db7 --- /dev/null +++ b/target/linux/ubicom32/files/arch/ubicom32/mach-common/usb_tio.c @@ -0,0 +1,356 @@ +/* + * 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; +} |