| Message ID | 1539833014-1738-1-git-send-email-honghui.zhang@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
| Series | PCI: mediatek: Use devm_of_pci_get_host_bridge_resources() to parse DT | expand |
On Fri, 2018-11-02 at 14:36 +0800, Ryder Lee wrote: > On Thu, 2018-10-18 at 11:23 +0800, Honghui Zhang (张洪辉) wrote: > > From: Honghui Zhang <honghui.zhang@mediatek.com> > > > > Use the devm_of_pci_get_host_bridge_resources() API in place of the PCI OF > > DT parser. > > > > Signed-off-by: Honghui Zhang <honghui.zhang@mediatek.com> > > --- > > drivers/pci/controller/pcie-mediatek.c | 109 +++++++++------------------------ > > 1 file changed, 29 insertions(+), 80 deletions(-) > > [......] > > > > Acked-by: Ryder Lee <ryder.lee@mediatek.com> > > Hi, Lorenzo, could you help take a look at this patch? Thanks.
On Thu, Oct 18, 2018 at 11:23:34AM +0800, honghui.zhang@mediatek.com wrote: > From: Honghui Zhang <honghui.zhang@mediatek.com> > > Use the devm_of_pci_get_host_bridge_resources() API in place of the PCI OF > DT parser. > > Signed-off-by: Honghui Zhang <honghui.zhang@mediatek.com> > --- > drivers/pci/controller/pcie-mediatek.c | 109 +++++++++------------------------ > 1 file changed, 29 insertions(+), 80 deletions(-) > > diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c > index 2a1f97c..6632d4e 100644 > --- a/drivers/pci/controller/pcie-mediatek.c > +++ b/drivers/pci/controller/pcie-mediatek.c > @@ -197,29 +197,20 @@ struct mtk_pcie_port { > * @dev: pointer to PCIe device > * @base: IO mapped register base > * @free_ck: free-run reference clock > - * @io: IO resource > - * @pio: PIO resource > * @mem: non-prefetchable memory resource > - * @busn: bus range > - * @offset: IO / Memory offset > * @ports: pointer to PCIe port information > * @soc: pointer to SoC-dependent operations > + * @busnr: root bus number > */ > struct mtk_pcie { > struct device *dev; > void __iomem *base; > struct clk *free_ck; > > - struct resource io; > - struct resource pio; > struct resource mem; > - struct resource busn; > - struct { > - resource_size_t mem; > - resource_size_t io; > - } offset; > struct list_head ports; > const struct mtk_pcie_soc *soc; > + int busnr; If you move the code initializing and probing the pci_host_bridge into mtk_pcie_setup() (and rename that function) this variable becomes useless. It should be an unsigned int, by the way. > }; > > static void mtk_pcie_subsys_powerdown(struct mtk_pcie *pcie) > @@ -1045,55 +1036,42 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie) > { > struct device *dev = pcie->dev; > struct device_node *node = dev->of_node, *child; > - struct of_pci_range_parser parser; > - struct of_pci_range range; > - struct resource res; > struct mtk_pcie_port *port, *tmp; > + struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie); > + struct list_head *windows = &host->windows; > + struct resource_entry *win, *tmp_win; > + resource_size_t io_base; > int err; > > - if (of_pci_range_parser_init(&parser, node)) { > - dev_err(dev, "missing \"ranges\" property\n"); > - return -EINVAL; > - } > + err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, > + windows, &io_base); > + if (err) > + return err; > > - for_each_of_pci_range(&parser, &range) { > - err = of_pci_range_to_resource(&range, node, &res); > - if (err < 0) > - return err; > + err = devm_request_pci_bus_resources(dev, windows); > + if (err < 0) > + return err; > > - switch (res.flags & IORESOURCE_TYPE_BITS) { > + /* Get the I/O and memory ranges from DT */ > + resource_list_for_each_entry_safe(win, tmp_win, windows) { > + switch (resource_type(win->res)) { > case IORESOURCE_IO: > - pcie->offset.io = res.start - range.pci_addr; > - > - memcpy(&pcie->pio, &res, sizeof(res)); > - pcie->pio.name = node->full_name; > - > - pcie->io.start = range.cpu_addr; > - pcie->io.end = range.cpu_addr + range.size - 1; > - pcie->io.flags = IORESOURCE_MEM; > - pcie->io.name = "I/O"; > - > - memcpy(&res, &pcie->io, sizeof(res)); > - break; > - > + err = devm_pci_remap_iospace(dev, win->res, io_base); > + if (err) { > + dev_warn(dev, "error %d: failed to map resource %pR\n", > + err, win->res); > + resource_list_destroy_entry(win); > + } Missing a break. > case IORESOURCE_MEM: > - pcie->offset.mem = res.start - range.pci_addr; > - > - memcpy(&pcie->mem, &res, sizeof(res)); > + memcpy(&pcie->mem, win->res, sizeof(*win->res)); > pcie->mem.name = "non-prefetchable"; > break; > + case IORESOURCE_BUS: > + pcie->busnr = win->res->start; > + break; > } > } > > - err = of_pci_parse_bus_range(node, &pcie->busn); > - if (err < 0) { > - dev_err(dev, "failed to parse bus ranges property: %d\n", err); > - pcie->busn.name = node->name; > - pcie->busn.start = 0; > - pcie->busn.end = 0xff; > - pcie->busn.flags = IORESOURCE_BUS; > - } > - > for_each_available_child_of_node(node, child) { > int slot; > > @@ -1125,28 +1103,6 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie) > return 0; > } > > -static int mtk_pcie_request_resources(struct mtk_pcie *pcie) > -{ > - struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie); > - struct list_head *windows = &host->windows; > - struct device *dev = pcie->dev; > - int err; > - > - pci_add_resource_offset(windows, &pcie->pio, pcie->offset.io); > - pci_add_resource_offset(windows, &pcie->mem, pcie->offset.mem); > - pci_add_resource(windows, &pcie->busn); > - > - err = devm_request_pci_bus_resources(dev, windows); > - if (err < 0) > - return err; > - > - err = devm_pci_remap_iospace(dev, &pcie->pio, pcie->io.start); > - if (err < 0) > - return err; > - > - return 0; > -} > - > static int mtk_pcie_probe(struct platform_device *pdev) > { > struct device *dev = &pdev->dev; > @@ -1169,11 +1125,7 @@ static int mtk_pcie_probe(struct platform_device *pdev) > if (err) > return err; > > - err = mtk_pcie_request_resources(pcie); > - if (err) > - goto put_resources; > - > - host->busnr = pcie->busn.start; > + host->busnr = pcie->busnr; > host->dev.parent = pcie->dev; > host->ops = pcie->soc->ops; > host->map_irq = of_irq_parse_and_map_pci; > @@ -1181,12 +1133,9 @@ static int mtk_pcie_probe(struct platform_device *pdev) > host->sysdata = pcie; > > err = pci_host_probe(host); > - if (err) > - goto put_resources; > - > - return 0; > + if (!err) > + return 0; > No, leave the error path. err = pci_host_probe(host); if (err) goto put_resources; return 0; put_resources: ... it is easier to follow. Thanks, Lorenzo > -put_resources: > if (!list_empty(&pcie->ports)) > mtk_pcie_put_resources(pcie); > > -- > 2.6.4 >
On Wed, 2018-11-07 at 12:03 +0000, Lorenzo Pieralisi wrote: > On Thu, Oct 18, 2018 at 11:23:34AM +0800, honghui.zhang@mediatek.com wrote: > > From: Honghui Zhang <honghui.zhang@mediatek.com> > > > > Use the devm_of_pci_get_host_bridge_resources() API in place of the PCI OF > > DT parser. > > > > Signed-off-by: Honghui Zhang <honghui.zhang@mediatek.com> > > --- > > drivers/pci/controller/pcie-mediatek.c | 109 +++++++++------------------------ > > 1 file changed, 29 insertions(+), 80 deletions(-) > > > > diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c > > index 2a1f97c..6632d4e 100644 > > --- a/drivers/pci/controller/pcie-mediatek.c > > +++ b/drivers/pci/controller/pcie-mediatek.c > > @@ -197,29 +197,20 @@ struct mtk_pcie_port { > > * @dev: pointer to PCIe device > > * @base: IO mapped register base > > * @free_ck: free-run reference clock > > - * @io: IO resource > > - * @pio: PIO resource > > * @mem: non-prefetchable memory resource > > - * @busn: bus range > > - * @offset: IO / Memory offset > > * @ports: pointer to PCIe port information > > * @soc: pointer to SoC-dependent operations > > + * @busnr: root bus number > > */ > > struct mtk_pcie { > > struct device *dev; > > void __iomem *base; > > struct clk *free_ck; > > > > - struct resource io; > > - struct resource pio; > > struct resource mem; > > - struct resource busn; > > - struct { > > - resource_size_t mem; > > - resource_size_t io; > > - } offset; > > struct list_head ports; > > const struct mtk_pcie_soc *soc; > > + int busnr; > > If you move the code initializing and probing the pci_host_bridge into > mtk_pcie_setup() (and rename that function) this variable becomes > useless. It should be an unsigned int, by the way. Yes, I can directly assign the busnr to host->busnr in the mtk_pcie_setup and remove this variable. Thanks. > > > }; > > > > static void mtk_pcie_subsys_powerdown(struct mtk_pcie *pcie) > > @@ -1045,55 +1036,42 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie) > > { > > struct device *dev = pcie->dev; > > struct device_node *node = dev->of_node, *child; > > - struct of_pci_range_parser parser; > > - struct of_pci_range range; > > - struct resource res; > > struct mtk_pcie_port *port, *tmp; > > + struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie); > > + struct list_head *windows = &host->windows; > > + struct resource_entry *win, *tmp_win; > > + resource_size_t io_base; > > int err; > > > > - if (of_pci_range_parser_init(&parser, node)) { > > - dev_err(dev, "missing \"ranges\" property\n"); > > - return -EINVAL; > > - } > > + err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, > > + windows, &io_base); > > + if (err) > > + return err; > > > > - for_each_of_pci_range(&parser, &range) { > > - err = of_pci_range_to_resource(&range, node, &res); > > - if (err < 0) > > - return err; > > + err = devm_request_pci_bus_resources(dev, windows); > > + if (err < 0) > > + return err; > > > > - switch (res.flags & IORESOURCE_TYPE_BITS) { > > + /* Get the I/O and memory ranges from DT */ > > + resource_list_for_each_entry_safe(win, tmp_win, windows) { > > + switch (resource_type(win->res)) { > > case IORESOURCE_IO: > > - pcie->offset.io = res.start - range.pci_addr; > > - > > - memcpy(&pcie->pio, &res, sizeof(res)); > > - pcie->pio.name = node->full_name; > > - > > - pcie->io.start = range.cpu_addr; > > - pcie->io.end = range.cpu_addr + range.size - 1; > > - pcie->io.flags = IORESOURCE_MEM; > > - pcie->io.name = "I/O"; > > - > > - memcpy(&res, &pcie->io, sizeof(res)); > > - break; > > - > > + err = devm_pci_remap_iospace(dev, win->res, io_base); > > + if (err) { > > + dev_warn(dev, "error %d: failed to map resource %pR\n", > > + err, win->res); > > + resource_list_destroy_entry(win); > > + } > > Missing a break. Thanks. > > > case IORESOURCE_MEM: > > - pcie->offset.mem = res.start - range.pci_addr; > > - > > - memcpy(&pcie->mem, &res, sizeof(res)); > > + memcpy(&pcie->mem, win->res, sizeof(*win->res)); > > pcie->mem.name = "non-prefetchable"; > > break; > > + case IORESOURCE_BUS: > > + pcie->busnr = win->res->start; > > + break; > > } > > } > > > > - err = of_pci_parse_bus_range(node, &pcie->busn); > > - if (err < 0) { > > - dev_err(dev, "failed to parse bus ranges property: %d\n", err); > > - pcie->busn.name = node->name; > > - pcie->busn.start = 0; > > - pcie->busn.end = 0xff; > > - pcie->busn.flags = IORESOURCE_BUS; > > - } > > - > > for_each_available_child_of_node(node, child) { > > int slot; > > > > @@ -1125,28 +1103,6 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie) > > return 0; > > } > > > > -static int mtk_pcie_request_resources(struct mtk_pcie *pcie) > > -{ > > - struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie); > > - struct list_head *windows = &host->windows; > > - struct device *dev = pcie->dev; > > - int err; > > - > > - pci_add_resource_offset(windows, &pcie->pio, pcie->offset.io); > > - pci_add_resource_offset(windows, &pcie->mem, pcie->offset.mem); > > - pci_add_resource(windows, &pcie->busn); > > - > > - err = devm_request_pci_bus_resources(dev, windows); > > - if (err < 0) > > - return err; > > - > > - err = devm_pci_remap_iospace(dev, &pcie->pio, pcie->io.start); > > - if (err < 0) > > - return err; > > - > > - return 0; > > -} > > - > > static int mtk_pcie_probe(struct platform_device *pdev) > > { > > struct device *dev = &pdev->dev; > > @@ -1169,11 +1125,7 @@ static int mtk_pcie_probe(struct platform_device *pdev) > > if (err) > > return err; > > > > - err = mtk_pcie_request_resources(pcie); > > - if (err) > > - goto put_resources; > > - > > - host->busnr = pcie->busn.start; > > + host->busnr = pcie->busnr; > > host->dev.parent = pcie->dev; > > host->ops = pcie->soc->ops; > > host->map_irq = of_irq_parse_and_map_pci; > > @@ -1181,12 +1133,9 @@ static int mtk_pcie_probe(struct platform_device *pdev) > > host->sysdata = pcie; > > > > err = pci_host_probe(host); > > - if (err) > > - goto put_resources; > > - > > - return 0; > > + if (!err) > > + return 0; > > > > No, leave the error path. > > err = pci_host_probe(host); > if (err) > goto put_resources; > > return 0; > put_resources: > ... > > it is easier to follow. > OK. I will revert this snippet in the next version. Thanks. > Thanks, > Lorenzo > > > -put_resources: > > if (!list_empty(&pcie->ports)) > > mtk_pcie_put_resources(pcie); > > > > -- > > 2.6.4 > >
diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c index 2a1f97c..6632d4e 100644 --- a/drivers/pci/controller/pcie-mediatek.c +++ b/drivers/pci/controller/pcie-mediatek.c @@ -197,29 +197,20 @@ struct mtk_pcie_port { * @dev: pointer to PCIe device * @base: IO mapped register base * @free_ck: free-run reference clock - * @io: IO resource - * @pio: PIO resource * @mem: non-prefetchable memory resource - * @busn: bus range - * @offset: IO / Memory offset * @ports: pointer to PCIe port information * @soc: pointer to SoC-dependent operations + * @busnr: root bus number */ struct mtk_pcie { struct device *dev; void __iomem *base; struct clk *free_ck; - struct resource io; - struct resource pio; struct resource mem; - struct resource busn; - struct { - resource_size_t mem; - resource_size_t io; - } offset; struct list_head ports; const struct mtk_pcie_soc *soc; + int busnr; }; static void mtk_pcie_subsys_powerdown(struct mtk_pcie *pcie) @@ -1045,55 +1036,42 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie) { struct device *dev = pcie->dev; struct device_node *node = dev->of_node, *child; - struct of_pci_range_parser parser; - struct of_pci_range range; - struct resource res; struct mtk_pcie_port *port, *tmp; + struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie); + struct list_head *windows = &host->windows; + struct resource_entry *win, *tmp_win; + resource_size_t io_base; int err; - if (of_pci_range_parser_init(&parser, node)) { - dev_err(dev, "missing \"ranges\" property\n"); - return -EINVAL; - } + err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, + windows, &io_base); + if (err) + return err; - for_each_of_pci_range(&parser, &range) { - err = of_pci_range_to_resource(&range, node, &res); - if (err < 0) - return err; + err = devm_request_pci_bus_resources(dev, windows); + if (err < 0) + return err; - switch (res.flags & IORESOURCE_TYPE_BITS) { + /* Get the I/O and memory ranges from DT */ + resource_list_for_each_entry_safe(win, tmp_win, windows) { + switch (resource_type(win->res)) { case IORESOURCE_IO: - pcie->offset.io = res.start - range.pci_addr; - - memcpy(&pcie->pio, &res, sizeof(res)); - pcie->pio.name = node->full_name; - - pcie->io.start = range.cpu_addr; - pcie->io.end = range.cpu_addr + range.size - 1; - pcie->io.flags = IORESOURCE_MEM; - pcie->io.name = "I/O"; - - memcpy(&res, &pcie->io, sizeof(res)); - break; - + err = devm_pci_remap_iospace(dev, win->res, io_base); + if (err) { + dev_warn(dev, "error %d: failed to map resource %pR\n", + err, win->res); + resource_list_destroy_entry(win); + } case IORESOURCE_MEM: - pcie->offset.mem = res.start - range.pci_addr; - - memcpy(&pcie->mem, &res, sizeof(res)); + memcpy(&pcie->mem, win->res, sizeof(*win->res)); pcie->mem.name = "non-prefetchable"; break; + case IORESOURCE_BUS: + pcie->busnr = win->res->start; + break; } } - err = of_pci_parse_bus_range(node, &pcie->busn); - if (err < 0) { - dev_err(dev, "failed to parse bus ranges property: %d\n", err); - pcie->busn.name = node->name; - pcie->busn.start = 0; - pcie->busn.end = 0xff; - pcie->busn.flags = IORESOURCE_BUS; - } - for_each_available_child_of_node(node, child) { int slot; @@ -1125,28 +1103,6 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie) return 0; } -static int mtk_pcie_request_resources(struct mtk_pcie *pcie) -{ - struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie); - struct list_head *windows = &host->windows; - struct device *dev = pcie->dev; - int err; - - pci_add_resource_offset(windows, &pcie->pio, pcie->offset.io); - pci_add_resource_offset(windows, &pcie->mem, pcie->offset.mem); - pci_add_resource(windows, &pcie->busn); - - err = devm_request_pci_bus_resources(dev, windows); - if (err < 0) - return err; - - err = devm_pci_remap_iospace(dev, &pcie->pio, pcie->io.start); - if (err < 0) - return err; - - return 0; -} - static int mtk_pcie_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -1169,11 +1125,7 @@ static int mtk_pcie_probe(struct platform_device *pdev) if (err) return err; - err = mtk_pcie_request_resources(pcie); - if (err) - goto put_resources; - - host->busnr = pcie->busn.start; + host->busnr = pcie->busnr; host->dev.parent = pcie->dev; host->ops = pcie->soc->ops; host->map_irq = of_irq_parse_and_map_pci; @@ -1181,12 +1133,9 @@ static int mtk_pcie_probe(struct platform_device *pdev) host->sysdata = pcie; err = pci_host_probe(host); - if (err) - goto put_resources; - - return 0; + if (!err) + return 0; -put_resources: if (!list_empty(&pcie->ports)) mtk_pcie_put_resources(pcie);