netdev - Re: [PATCH] ems_pci: fix size of CAN controllers BAR mapping for CPC-PCI v2

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Date:	Thu, 24 Sep 2009 13:52:58 +0200
From:	Sebastian Haas <haas@...-wuensche.com>
To:	netdev@...r.kernel.org
CC:	Wolfgang Grandegger <wg@...ndegger.com>, davem@...emloft.net,
	socketcan-core@...ts.berlios.de
Subject: Re: [PATCH] ems_pci: fix size of CAN controllers BAR mapping for
 CPC-PCI	v2

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Hi Wolfgang,

Wolfgang Grandegger schrieb:
> Hi Sebastian,
> 
> Sebastian Haas wrote:
>> The driver mapped only 128 bytes of the CAN controller address space when a
>> CPC-PCI v2 was detected (incl. CPC-104P). This patch will fix it by always
>> mapping the whole address space (4096 bytes on all boards) of the
>> corresponding PCI BAR.
>>
>> Signed-off-by: Sebastian Haas <haas@...-wuensche.com>
>> ---
>>
>>  drivers/net/can/sja1000/ems_pci.c |    8 +++++---
>>  1 files changed, 5 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/can/sja1000/ems_pci.c b/drivers/net/can/sja1000/ems_pci.c
>> index 7d84b8a..ba98063 100644
>> --- a/drivers/net/can/sja1000/ems_pci.c
>> +++ b/drivers/net/can/sja1000/ems_pci.c
>> @@ -94,12 +94,14 @@ struct ems_pci_card {
>>  #define EMS_PCI_CDR             (CDR_CBP | CDR_CLKOUT_MASK)
>>  
>>  #define EMS_PCI_V1_BASE_BAR     1
>> -#define EMS_PCI_V1_MEM_SIZE     4096
>> +#define EMS_PCI_V1_MEM_SIZE     4096 /* size of PITA control area */
>>  #define EMS_PCI_V2_BASE_BAR     2
>> -#define EMS_PCI_V2_MEM_SIZE     128
>> +#define EMS_PCI_V2_MEM_SIZE     128 /* size of PLX control area */
>>  #define EMS_PCI_CAN_BASE_OFFSET 0x400 /* offset where the controllers starts */
>>  #define EMS_PCI_CAN_CTRL_SIZE   0x200 /* memory size for each controller */
>>  
>> +#define EMS_PCI_CONTR_MEM_SIZE  4096 /* size of controller area */
>> +
>>  static struct pci_device_id ems_pci_tbl[] = {
>>  	/* CPC-PCI v1 */
>>  	{PCI_VENDOR_ID_SIEMENS, 0x2104, PCI_ANY_ID, PCI_ANY_ID,},
>> @@ -266,7 +268,7 @@ static int __devinit ems_pci_add_card(struct pci_dev *pdev,
>>  		goto failure_cleanup;
>>  	}
>>  
>> -	card->base_addr = pci_iomap(pdev, base_bar, mem_size);
>> +	card->base_addr = pci_iomap(pdev, base_bar, EMS_PCI_CONTR_MEM_SIZE);
>>  	if (card->base_addr == NULL) {
>>  		err = -ENOMEM;
>>  		goto failure_cleanup;
> 
> I see. To avoid confusion I suggest renaming some variables and defines:
> 
> s/EMS_PCI_V1_MEM_SIZE/EMS_PCI_V1_CONF_SIZE/
> s/EMS_PCI_V2_MEM_SIZE/EMS_PCI_V2_CONF_SIZE/
> s/mem_size/conf_size/
> s/EMS_PCI_CONTR_MEM_SIZE/EMS_PCI_BASE_SIZE/
> 
> Would that not be more appropriate?
Okay, I just wanted to minimize changes. Will change it and resubmit.

Sebastian
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