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Message-ID: <1551401448.24631.15.camel@intel.com>
Date: Fri, 01 Mar 2019 08:50:48 +0800
From: Ley Foon Tan <ley.foon.tan@...el.com>
To: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, linux-kernel@...r.kernel.org,
linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
lftan.linux@...il.com
Subject: Re: [PATCH v6 1/3] PCI: altera: Add Stratix 10 PCIe support
On Thu, 2019-02-28 at 10:56 +0000, Lorenzo Pieralisi wrote:
> On Thu, Feb 28, 2019 at 06:52:50PM +0800, Ley Foon Tan wrote:
>
> [...]
>
> >
> > +static int s10_tlp_read_packet(struct altera_pcie *pcie, u32
> > *value)
> > +{
> > + int i;
> > + u32 ctrl;
> > + u32 comp_status;
> > + u32 dw[4];
> > + u32 count;
> > +
> > + for (i = 0; i < TLP_LOOP; i++) {
> > + ctrl = cra_readl(pcie, S10_RP_RXCPL_STATUS);
> > + if (!(ctrl & RP_RXCPL_SOP)) {
> > + udelay(5);
> > + continue;
> > + }
> > +
> > + /* Read first DW */
> > + dw[0] = cra_readl(pcie, S10_RP_RXCPL_REG);
> > + count = 1;
> > +
> > + /* Poll for EOP */
> > + for (i = 0; i < TLP_LOOP && count <
> > ARRAY_SIZE(dw); i++) {
> > + ctrl = cra_readl(pcie,
> > S10_RP_RXCPL_STATUS);
> > + dw[count++] = cra_reeadl(pcie,
> > S10_RP_RXCPL_REG);
> > + if (ctrl & RP_RXCPL_EOP) {
> > + comp_status =
> > TLP_COMP_STATUS(dw[1]);
> > + if (comp_status)
> > + return
> > PCIBIOS_DEVICE_NOT_FOUND;
> > +
> > + if (value &&
> > + TLP_BYTE_COUNT(dw[1]) ==
> > sizeof(u32) &&
> > + count == 4)
> > + *value = dw[3];
> > +
> > + return PCIBIOS_SUCCESSFUL;
> > + }
> Two more things.
>
> - Why don't you need a udelay() in the inner loop ?
It has received start of packet (SOP) when in the inner loop, next DW
will come on next. So, I don't add udelay here.
> - I think that count >= ARRAY_SIZE(dw) in the inner loop is an error
> condition and it should be flagged up with a warning before
> exiting.
Yes, please add this.
>
> I can make these changes if you let me know your thoughts on this.
Please go ahead and change this.
Thanks.
Regards
Ley Foon
>
> Lorenzo
>
> >
> > + }
> > + }
> > +
> > + return PCIBIOS_DEVICE_NOT_FOUND;
> > +}
> > +
> > static void tlp_write_packet(struct altera_pcie *pcie, u32
> > *headers,
> > u32 data, bool align)
> > {
> > @@ -210,6 +306,15 @@ static void tlp_write_packet(struct
> > altera_pcie *pcie, u32 *headers,
> > tlp_write_tx(pcie, &tlp_rp_regdata);
> > }
> >
> > +static void s10_tlp_write_packet(struct altera_pcie *pcie, u32
> > *headers,
> > + u32 data, bool dummy)
> > +{
> > + s10_tlp_write_tx(pcie, headers[0], RP_TX_SOP);
> > + s10_tlp_write_tx(pcie, headers[1], 0);
> > + s10_tlp_write_tx(pcie, headers[2], 0);
> > + s10_tlp_write_tx(pcie, data, RP_TX_EOP);
> > +}
> > +
> > static int tlp_cfg_dword_read(struct altera_pcie *pcie, u8 bus,
> > u32 devfn,
> > int where, u8 byte_en, u32 *value)
> > {
> > @@ -219,9 +324,9 @@ static int tlp_cfg_dword_read(struct
> > altera_pcie *pcie, u8 bus, u32 devfn,
> > headers[1] = TLP_CFG_DW1(pcie, TLP_READ_TAG, byte_en);
> > headers[2] = TLP_CFG_DW2(bus, devfn, where);
> >
> > - tlp_write_packet(pcie, headers, 0, false);
> > + pcie->pcie_data->ops->tlp_write_pkt(pcie, headers, 0,
> > false);
> >
> > - return tlp_read_packet(pcie, value);
> > + return pcie->pcie_data->ops->tlp_read_pkt(pcie, value);
> > }
> >
> > static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus,
> > u32 devfn,
> > @@ -236,11 +341,13 @@ static int tlp_cfg_dword_write(struct
> > altera_pcie *pcie, u8 bus, u32 devfn,
> >
> > /* check alignment to Qword */
> > if ((where & 0x7) == 0)
> > - tlp_write_packet(pcie, headers, value, true);
> > + pcie->pcie_data->ops->tlp_write_pkt(pcie, headers,
> > + value, true);
> > else
> > - tlp_write_packet(pcie, headers, value, false);
> > + pcie->pcie_data->ops->tlp_write_pkt(pcie, headers,
> > + value, false);
> >
> > - ret = tlp_read_packet(pcie, NULL);
> > + ret = pcie->pcie_data->ops->tlp_read_pkt(pcie, NULL);
> > if (ret != PCIBIOS_SUCCESSFUL)
> > return ret;
> >
> > @@ -254,6 +361,53 @@ static int tlp_cfg_dword_write(struct
> > altera_pcie *pcie, u8 bus, u32 devfn,
> > return PCIBIOS_SUCCESSFUL;
> > }
> >
> > +static int s10_rp_read_cfg(struct altera_pcie *pcie, int where,
> > + int size, u32 *value)
> > +{
> > + void *addr = S10_RP_CFG_ADDR(pcie, where);
> > +
> > + switch (size) {
> > + case 1:
> > + *value = readb(addr);
> > + break;
> > + case 2:
> > + *value = readw(addr);
> > + break;
> > + default:
> > + *value = readl(addr);
> > + break;
> > + }
> > +
> > + return PCIBIOS_SUCCESSFUL;
> > +}
> > +
> > +static int s10_rp_write_cfg(struct altera_pcie *pcie, u8 busno,
> > + int where, int size, u32 value)
> > +{
> > + void *addr = S10_RP_CFG_ADDR(pcie, where);
> > +
> > + switch (size) {
> > + case 1:
> > + writeb(value, addr);
> > + break;
> > + case 2:
> > + writew(value, addr);
> > + break;
> > + default:
> > + writel(value, addr);
> > + break;
> > + }
> > +
> > + /*
> > + * Monitor changes to PCI_PRIMARY_BUS register on root
> > port
> > + * and update local copy of root bus number accordingly.
> > + */
> > + if (busno == pcie->root_bus_nr && where ==
> > PCI_PRIMARY_BUS)
> > + pcie->root_bus_nr = value & 0xff;
> > +
> > + return PCIBIOS_SUCCESSFUL;
> > +}
> > +
> > static int _altera_pcie_cfg_read(struct altera_pcie *pcie, u8
> > busno,
> > unsigned int devfn, int where,
> > int size,
> > u32 *value)
> > @@ -262,6 +416,10 @@ static int _altera_pcie_cfg_read(struct
> > altera_pcie *pcie, u8 busno,
> > u32 data;
> > u8 byte_en;
> >
> > + if (busno == pcie->root_bus_nr && pcie->pcie_data->ops-
> > >rp_read_cfg)
> > + return pcie->pcie_data->ops->rp_read_cfg(pcie,
> > where,
> > + size,
> > value);
> > +
> > switch (size) {
> > case 1:
> > byte_en = 1 << (where & 3);
> > @@ -302,6 +460,10 @@ static int _altera_pcie_cfg_write(struct
> > altera_pcie *pcie, u8 busno,
> > u32 shift = 8 * (where & 3);
> > u8 byte_en;
> >
> > + if (busno == pcie->root_bus_nr && pcie->pcie_data->ops-
> > >rp_write_cfg)
> > + return pcie->pcie_data->ops->rp_write_cfg(pcie,
> > busno,
> > + where, size,
> > value);
> > +
> > switch (size) {
> > case 1:
> > data32 = (value & 0xff) << shift;
> > @@ -365,7 +527,8 @@ static int altera_read_cap_word(struct
> > altera_pcie *pcie, u8 busno,
> > int ret;
> >
> > ret = _altera_pcie_cfg_read(pcie, busno, devfn,
> > - PCIE_CAP_OFFSET + offset,
> > sizeof(*value),
> > + pcie->pcie_data->cap_offset +
> > offset,
> > + sizeof(*value),
> > &data);
> > *value = data;
> > return ret;
> > @@ -375,7 +538,8 @@ static int altera_write_cap_word(struct
> > altera_pcie *pcie, u8 busno,
> > unsigned int devfn, int offset,
> > u16 value)
> > {
> > return _altera_pcie_cfg_write(pcie, busno, devfn,
> > - PCIE_CAP_OFFSET + offset,
> > sizeof(value),
> > + pcie->pcie_data->cap_offset
> > + offset,
> > + sizeof(value),
> > value);
> > }
> >
> > @@ -403,7 +567,7 @@ static void altera_wait_link_retrain(struct
> > altera_pcie *pcie)
> > /* Wait for link is up */
> > start_jiffies = jiffies;
> > for (;;) {
> > - if (altera_pcie_link_up(pcie))
> > + if (pcie->pcie_data->ops->get_link_status(pcie))
> > break;
> >
> > if (time_after(jiffies, start_jiffies +
> > LINK_UP_TIMEOUT)) {
> > @@ -418,7 +582,7 @@ static void altera_pcie_retrain(struct
> > altera_pcie *pcie)
> > {
> > u16 linkcap, linkstat, linkctl;
> >
> > - if (!altera_pcie_link_up(pcie))
> > + if (!pcie->pcie_data->ops->get_link_status(pcie))
> > return;
> >
> > /*
> > @@ -540,12 +704,20 @@ static int altera_pcie_parse_dt(struct
> > altera_pcie *pcie)
> > struct device *dev = &pcie->pdev->dev;
> > struct platform_device *pdev = pcie->pdev;
> > struct resource *cra;
> > + struct resource *hip;
> >
> > cra = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > "Cra");
> > pcie->cra_base = devm_ioremap_resource(dev, cra);
> > if (IS_ERR(pcie->cra_base))
> > return PTR_ERR(pcie->cra_base);
> >
> > + if (pcie->pcie_data->version == ALTERA_PCIE_V2) {
> > + hip = platform_get_resource_byname(pdev,
> > IORESOURCE_MEM, "Hip");
> > + pcie->hip_base = devm_ioremap_resource(&pdev->dev,
> > hip);
> > + if (IS_ERR(pcie->hip_base))
> > + return PTR_ERR(pcie->hip_base);
> > + }
> > +
> > /* setup IRQ */
> > pcie->irq = platform_get_irq(pdev, 0);
> > if (pcie->irq < 0) {
> > @@ -562,6 +734,48 @@ static void altera_pcie_host_init(struct
> > altera_pcie *pcie)
> > altera_pcie_retrain(pcie);
> > }
> >
> > +static const struct altera_pcie_ops altera_pcie_ops_1_0 = {
> > + .tlp_read_pkt = tlp_read_packet,
> > + .tlp_write_pkt = tlp_write_packet,
> > + .get_link_status = altera_pcie_link_up,
> > +};
> > +
> > +static const struct altera_pcie_ops altera_pcie_ops_2_0 = {
> > + .tlp_read_pkt = s10_tlp_read_packet,
> > + .tlp_write_pkt = s10_tlp_write_packet,
> > + .get_link_status = s10_altera_pcie_link_up,
> > + .rp_read_cfg = s10_rp_read_cfg,
> > + .rp_write_cfg = s10_rp_write_cfg,
> > +};
> > +
> > +static const struct altera_pcie_data altera_pcie_1_0_data = {
> > + .ops = &altera_pcie_ops_1_0,
> > + .cap_offset = 0x80,
> > + .version = ALTERA_PCIE_V1,
> > + .cfgrd0 = TLP_FMTTYPE_CFGRD0,
> > + .cfgrd1 = TLP_FMTTYPE_CFGRD1,
> > + .cfgwr0 = TLP_FMTTYPE_CFGWR0,
> > + .cfgwr1 = TLP_FMTTYPE_CFGWR1,
> > +};
> > +
> > +static const struct altera_pcie_data altera_pcie_2_0_data = {
> > + .ops = &altera_pcie_ops_2_0,
> > + .version = ALTERA_PCIE_V2,
> > + .cap_offset = 0x70,
> > + .cfgrd0 = S10_TLP_FMTTYPE_CFGRD0,
> > + .cfgrd1 = S10_TLP_FMTTYPE_CFGRD1,
> > + .cfgwr0 = S10_TLP_FMTTYPE_CFGWR0,
> > + .cfgwr1 = S10_TLP_FMTTYPE_CFGWR1,
> > +};
> > +
> > +static const struct of_device_id altera_pcie_of_match[] = {
> > + {.compatible = "altr,pcie-root-port-1.0",
> > + .data = &altera_pcie_1_0_data },
> > + {.compatible = "altr,pcie-root-port-2.0",
> > + .data = &altera_pcie_2_0_data },
> > + {},
> > +};
> > +
> > static int altera_pcie_probe(struct platform_device *pdev)
> > {
> > struct device *dev = &pdev->dev;
> > @@ -570,6 +784,7 @@ static int altera_pcie_probe(struct
> > platform_device *pdev)
> > struct pci_bus *child;
> > struct pci_host_bridge *bridge;
> > int ret;
> > + const struct of_device_id *match;
> >
> > bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
> > if (!bridge)
> > @@ -578,6 +793,12 @@ static int altera_pcie_probe(struct
> > platform_device *pdev)
> > pcie = pci_host_bridge_priv(bridge);
> > pcie->pdev = pdev;
> >
> > + match = of_match_device(altera_pcie_of_match, &pdev->dev);
> > + if (!match)
> > + return -ENODEV;
> > +
> > + pcie->pcie_data = match->data;
> > +
> > ret = altera_pcie_parse_dt(pcie);
> > if (ret) {
> > dev_err(dev, "Parsing DT failed\n");
> > @@ -628,11 +849,6 @@ static int altera_pcie_probe(struct
> > platform_device *pdev)
> > return ret;
> > }
> >
> > -static const struct of_device_id altera_pcie_of_match[] = {
> > - { .compatible = "altr,pcie-root-port-1.0", },
> > - {},
> > -};
> > -
> > static struct platform_driver altera_pcie_driver = {
> > .probe = altera_pcie_probe,
> > .driver = {
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