Re: [PATCH v3 2/5] PCI: designware: refactor MSI code to work with v3.65 dw hardware

[Jingoo Han]

On Tuesday, July 08, 2014 1:53 AM, Murali Karicheri wrote:
> On 07/07/2014 12:17 AM, Mohit KUMAR DCG wrote:
> > On Tuesday, July 01, 2014 3:15 AM, Murali Karicheri wrote:
> >>
> >> Keystone PCI controller is based on v3.65 version of the DW PCI h/w that
> >> implements MSI controller registers in application space compared to the
> >> newer version. This requires updates to the DW core API to support the PCI
> >> controller driver based on this old DW hardware. Add msi_irq_set()/clear()
> >> API functions to allow Set/Clear MSI IRQ enable bit in the application register.
> >> Also the old h/w uses MSI_IRQ register in application register space to raise
> >> MSI IRQ to the RC from EP. Current code uses the standard mechanism as
> >> per PCI spec. So add another API get_msi_data() to get the address of this
> >> register so that common code can be re-used on old h/w.
> >>
> >> Signed-off-by: Murali Karicheri<m-karicheri2@xxxxxx>
> >>
> >> CC: Santosh Shilimkar<santosh.shilimkar@xxxxxx>
> >> CC: Russell King<linux@xxxxxxxxxxxxxxxx>
> >> CC: Grant Likely<grant.likely@xxxxxxxxxx>
> >> CC: Rob Herring<robh+dt@xxxxxxxxxx>
> >> CC: Mohit Kumar<mohit.kumar@xxxxxx>
> >> CC: Jingoo Han<jg1.han@xxxxxxxxxxx>
> >> CC: Bjorn Helgaas<bhelgaas@xxxxxxxxxx>
> >> CC: Pratyush Anand<pratyush.anand@xxxxxx>
> >> CC: Richard Zhu<r65037@xxxxxxxxxxxxx>
> >> CC: Kishon Vijay Abraham I<kishon@xxxxxx>
> >> CC: Marek Vasut<marex@xxxxxxx>
> >> CC: Arnd Bergmann<arnd@xxxxxxxx>
> >> CC: Pawel Moll<pawel.moll@xxxxxxx>
> >> CC: Mark Rutland<mark.rutland@xxxxxxx>
> >> CC: Ian Campbell<ijc+devicetree@xxxxxxxxxxxxxx>
> >> CC: Kumar Gala<galak@xxxxxxxxxxxxxx>
> >> CC: Randy Dunlap<rdunlap@xxxxxxxxxxxxx>
> >> CC: Grant Likely<grant.likely@xxxxxxxxxx>
> >> ---
> >>   drivers/pci/host/pcie-designware.c |   50 ++++++++++++++++++++++++++-
> >> ---------
> >>   drivers/pci/host/pcie-designware.h |    3 +++
> >>   2 files changed, 39 insertions(+), 14 deletions(-)
> >>
> >> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-
> >> designware.c
> >> index d8f3af7..905941c 100644
> >> --- a/drivers/pci/host/pcie-designware.c
> >> +++ b/drivers/pci/host/pcie-designware.c
> >> @@ -217,27 +217,47 @@ static int find_valid_pos0(struct pcie_port *pp, int
> >> msgvec, int pos, int *pos0)
> >>   	return 0;
> >>   }
> >>
> >> +static void dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq) {
> >> +	unsigned int res, bit, val;
> >> +
> >> +	res = (irq / 32) * 12;
> >> +	bit = irq % 32;
> >> +	dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4,&val);
> >> +	val&= ~(1<<  bit);
> >> +	dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val); }
> >> +
> >>   static void clear_irq_range(struct pcie_port *pp, unsigned int irq_base,
> >>   			    unsigned int nvec, unsigned int pos)  {
> >> -	unsigned int i, res, bit, val;
> >> +	unsigned int i;
> >>
> >>   	for (i = 0; i<  nvec; i++) {
> >>   		irq_set_msi_desc_off(irq_base, i, NULL);
> >>   		clear_bit(pos + i, pp->msi_irq_in_use);
> >>   		/* Disable corresponding interrupt on MSI controller */
> >> -		res = ((pos + i) / 32) * 12;
> >> -		bit = (pos + i) % 32;
> >> -		dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res,
> >> 4,&val);
> >> -		val&= ~(1<<  bit);
> >> -		dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res,
> >> 4, val);
> >> +		if (pp->ops->msi_clear_irq)
> >> +			pp->ops->msi_clear_irq(pp, pos + i);
> >> +		else
> >> +			dw_pcie_msi_clear_irq(pp, pos + i);
> >>   	}
> >>   }
> >>
> >> +static void dw_pcie_msi_set_irq(struct pcie_port *pp, int irq) {
> >> +	unsigned int res, bit, val;
> >> +
> >> +	res = (irq / 32) * 12;
> >> +	bit = irq % 32;
> >> +	dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4,&val);
> >> +	val |= 1<<  bit;
> >> +	dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val); }
> >> +
> >>   static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)  {
> >> -	int res, bit, irq, pos0, pos1, i;
> >> -	u32 val;
> >> +	int irq, pos0, pos1, i;
> >>   	struct pcie_port *pp = sys_to_pcie(desc->dev->bus->sysdata);
> >>
> >>   	if (!pp) {
> >> @@ -281,11 +301,10 @@ static int assign_irq(int no_irqs, struct msi_desc
> >> *desc, int *pos)
> >>   		}
> >>   		set_bit(pos0 + i, pp->msi_irq_in_use);
> >>   		/*Enable corresponding interrupt in MSI interrupt controller
> >> */
> >> -		res = ((pos0 + i) / 32) * 12;
> >> -		bit = (pos0 + i) % 32;
> >> -		dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res,
> >> 4,&val);
> >> -		val |= 1<<  bit;
> >> -		dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res,
> >> 4, val);
> >> +		if (pp->ops->msi_set_irq)
> >> +			pp->ops->msi_set_irq(pp, pos0 + i);
> >> +		else
> >> +			dw_pcie_msi_set_irq(pp, pos0 + i);
> >>   	}
> >>
> >>   	*pos = pos0;
> >> @@ -353,7 +372,10 @@ static int dw_msi_setup_irq(struct msi_chip *chip,
> >> struct pci_dev *pdev,
> >>   	 */
> >>   	desc->msi_attrib.multiple = msgvec;
> >>
> >> -	msg.address_lo = virt_to_phys((void *)pp->msi_data);
> >> +	if (pp->ops->get_msi_data)
> >> +		msg.address_lo = pp->ops->get_msi_data(pp);
> >> +	else
> >> +		msg.address_lo = virt_to_phys((void *)pp->msi_data);
> >>   	msg.address_hi = 0x0;
> >>   	msg.data = pos;
> >>   	write_msi_msg(irq,&msg);
> >> diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-
> >> designware.h
> >> index 8121901..387f69e 100644
> >> --- a/drivers/pci/host/pcie-designware.h
> >> +++ b/drivers/pci/host/pcie-designware.h
> >> @@ -67,6 +67,9 @@ struct pcie_host_ops {
> >>   			unsigned int devfn, int where, int size, u32 val);
> >>   	int (*link_up)(struct pcie_port *pp);
> >>   	void (*host_init)(struct pcie_port *pp);
> >> +	void (*msi_set_irq)(struct pcie_port *pp, int irq);
> >> +	void (*msi_clear_irq)(struct pcie_port *pp, int irq);
> >> +	u32 (*get_msi_data)(struct pcie_port *pp);
> >>   };
> >>
> >>   int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val);
> >
> > - Now MSI specific dw code can be shared b/w old Synopsys controller (ver<  3.70)
> > and newer controller that standardize the MSI settings inside design ware core itself.
> >
> > Jingoo,
> >
> > Pls let us know if you have any concern or comment over this.
> >
> > Acked-by: Mohit Kumar<mohit.kumar@xxxxxx>
> >
> > Regards
> > Mohit
> >
> >> --
> >> 1.7.9.5
> >
> Mohit,
> 
> Thanks.
> 
> Jingoo, could you provide your response or Ack?

Acked-by: Jingoo Han <jg1.han@xxxxxxxxxxx>

Best regards,
Jingoo Han

> 
> Thanks
> --

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