2010/9/22 Max Filippov <jcmvbkbc@xxxxxxxxx>:
>> This code from Sagrad:
>>
>> SPI_IRQ(DISABLE);
>>
>> [skiped]
>
> If you look closer into the skipped part you'll see
>
> // 13. Enable host interrupts (EHostIntEnable1 = KIrqReady |
> KIrqWrReady | KHwUpdate | KSwUpdate)
> TempReg = (SPI_HOST_INT_READY | SPI_HOST_INT_UPDATE |
> SPI_HOST_INT_SW_UPDATE| SPI_HOST_INT_WR_READY);
> SPIDRVWriteReg32(SPI_ADRS_HOST_INT_EN, TempReg);
>
> which actually enables interrupts, exactly as SPI_IRQ(ENABLE); does.
>
>>
>> // 14. Wait for the READY interrupt (100 ms timeout).
>> // Loop while waiting for SPI device to respond with
>> interrupt, max timeout is WIFI_BOOT_TIMEOUT
>> for ( i = 0 ; i < WIFI_BOOT_TIMEOUT ; i++)
>> {
>> TempReg = SPIDRVReadReg32(SPI_ADRS_HOST_INTERRUPTS);
>> if( TempReg && SPI_HOST_INT_READY)
>> {
>> // 15. Acknowledge the READY interrupt.
>> SPIDRVWriteReg32(SPI_ADRS_HOST_INT_ACK,
>> SPI_HOST_INT_READY);
>> // 16. Issue the SLEEP interrupt.
>> SPIDRVWriteReg32(SPI_ADRS_ARM_INTERRUPTS,
>> SPI_ARM_INT_SLEEP);
>> break;
>> }
>>
>> Delay(1);
>> }
>>
>> SPI_IRQ(ENABLE);
OK. Chip (STLC4560) have some reasons to make IRQ reqest to host
(XScale or Omap). In code:
SPIDRVWriteReg32(SPI_ADRS_HOST_INT_EN, TempReg);
we set IRQ mask for chip. So, chip CAN generate IRQ request to host
(make pulse on host IRQ GPIO line). But host NOT serve this interrupt
request ( SPI_IRQ(DISABLE) ). Host wait for event by pool interrupt
reason register. In linux kernel (p54spi.c) host serve this IRQ.
SPI_IRQ(ENABLE/DISABLE) used for enable/disable host handler, but
SPIDRVWriteReg32(SPI_ADRS_HOST_INT_EN, TempReg) used for device IRQ
reason control. I think so.
And some words about license. On Sagrad web site this file described:
URL: http://sagrad.com/index.php?option=com_docman&task=doc_details&gid=26&Itemid=101
(download possible after registration on web site).
Name: Sagrad_MAC GPL Source Code + IP Stack
Description: FreeRTOS with: - WiFi SPI driver - Custom Sagrad MAC with
ability to scan and associate to an Open AP - uIP stack to provide
TCP/IP
Filename: STM32Wifi_V.1.0.0.1.zip
FreeRTOS distributed under GPL. Sagrad say - GPL code. But, in head of
file wrote:
/*
* IMPORTANT--READ CAREFULLY:
*
* Right, including without limitation, use, reproduction,
modification, and
* creation of derivative works, pertaining to this Source Code
("Document")
* are governed by a legal Agreement ("Agreement") between you (either
an
* individual or a single entity) and Sagrad Inc("Sagrad")
* and/or its licensee (both hereinafter called Licensor).
*
* By reproducing, modifying, creating derivative works, accepting,
* installing, viewing, accessing, transforming or otherwise using
this
* Document, you agree to be bound by the terms of the Agreement. If
you
* do not agree to the terms of the Agreement, Licensor is unwilling
to
* license rights to this Document to you. In such event, you may not
* use, reproduce, modify, create derivative works, install, view,
access,
* transport, transform or circulate this Document, and you should
promptly
* contact Licensor from which you acquired this Document for
instructions
* on returning or destroying this Document.
*
*
* CONFIDENTIAL, PROPRIETARY AND TRADE SECRET INFORMATION: This
Document
* contains confidential, proprietary and trade secret information of
* Intersil Americas Inc. and should be treated in a confidential
manner.
* Furthermore, this Document is protected by national copyright laws
and
* international treaties.
*
* Unauthorized use, reproduction, modification, creation of
derivative
* works or circulation is strictly prohibited.
*
* Copyright (c) 2008 Sagrad Inc. All Rights Reserved.
*
* The intent of Sagrad is to release this source to the public under
GPL
* upon the successful agreement with STMicro for the exclusive
* distribution rights for the STLC4560
*/
This code cant be directly placed into kernel source (FreeRTOS is NOT
Linux). This code contents NOT a code, but initialization and working
methods.
--
Sincerelly,
Alex A. Mihaylov
AKA MinimumLaw
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