[PATCH v2 09/12] PCI: brcmstb: Refactor for chips with many regular inbound BARs

[Stanimir Varbanov]

Hi,

On 7/4/24 16:30, Stanimir Varbanov wrote:
> Hi Jim,
> 
> On 7/3/24 21:02, Jim Quinlan wrote:
>> Previously, our chips provided three inbound "BARS" with fixed purposes:
>> the first was for mapping SOC registers, the second was for memory, and the
>> third was for memory but with the endian swapped.  We typically only used
>> one of these BARs.
>>
>> Complicating that BARs usage was the fact that the PCIe HW would do a
>> baroque internal mapping of system memory, and concatenate the regions of
>> multiple memory controllers.
>>
>> Newer chips such as the 7712 and Cable Modem SOCs have taken a step forward
>> and now provide multiple inbound BARs.  This works in concert with the
>> dma-ranges property, where each provided range becomes an inbound BAR.
>>
>> This commit provides support for these new chips and their multiple
>> inbound BARs but also keeps the legacy support for the older system.
>>
>> Signed-off-by: Jim Quinlan <james.quinlan at broadcom.com>
>> ---
>>  drivers/pci/controller/pcie-brcmstb.c | 199 +++++++++++++++++++-------
>>  1 file changed, 150 insertions(+), 49 deletions(-)

<cut>

>>  static int brcm_pcie_setup(struct brcm_pcie *pcie)
>>  {
>> -	u64 rc_bar2_offset, rc_bar2_size;
>> +	struct rc_bar rc_bars[PCIE_BRCM_MAX_RC_BARS];
>>  	void __iomem *base = pcie->base;
>>  	struct pci_host_bridge *bridge;
>>  	struct resource_entry *entry;
>>  	u32 tmp, burst, aspm_support;
>> -	int num_out_wins = 0;
>> -	int ret, memc;
>> +	int num_out_wins = 0, num_rc_bars = 0;
>> +	int i, memc;
>>  
>>  	/* Reset the bridge */
>>  	pcie->bridge_sw_init_set(pcie, 1);
>> @@ -933,17 +1016,47 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
>>  	u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_PCIE_RCB_64B_MODE_MASK);
>>  	writel(tmp, base + PCIE_MISC_MISC_CTRL);
>>  
>> -	ret = brcm_pcie_get_rc_bar2_size_and_offset(pcie, &rc_bar2_size,
>> -						    &rc_bar2_offset);
>> -	if (ret)
>> -		return ret;
>> +	num_rc_bars = brcm_pcie_get_rc_bar_sizes_and_offsets(pcie, rc_bars);
> 
> Can we change the function name to brcm_pcie_get_inbound_regions? ...

... or better brcm_pcie_get_inbound_wins() ?

~Stan