| Message ID | 20230922065331.3806925-14-yoshihiro.shimoda.uh@renesas.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Geert Uytterhoeven |
| Headers | show |
| Series | PCI: dwc: rcar-gen4: Add R-Car Gen4 PCIe support | expand |
Hi Yoshihiro, kernel test robot noticed the following build warnings: [auto build test WARNING on pci/next] [also build test WARNING on pci/for-linus linus/master v6.6-rc2 next-20230921] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Yoshihiro-Shimoda/PCI-dwc-endpoint-Add-multiple-PFs-support-for-dbi2/20230922-145529 base: https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next patch link: https://lore.kernel.org/r/20230922065331.3806925-14-yoshihiro.shimoda.uh%40renesas.com patch subject: [PATCH v21 13/16] PCI: dwc: rcar-gen4: Add R-Car Gen4 PCIe controller support config: sparc-allyesconfig (https://download.01.org/0day-ci/archive/20230922/202309222125.KiN4nFhD-lkp@intel.com/config) compiler: sparc64-linux-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230922/202309222125.KiN4nFhD-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202309222125.KiN4nFhD-lkp@intel.com/ All warnings (new ones prefixed by >>): >> drivers/pci/controller/dwc/pcie-rcar-gen4.c:155:5: warning: no previous prototype for 'rcar_gen4_pcie_common_init' [-Wmissing-prototypes] 155 | int rcar_gen4_pcie_common_init(struct rcar_gen4_pcie *rcar) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ >> drivers/pci/controller/dwc/pcie-rcar-gen4.c:197:6: warning: no previous prototype for 'rcar_gen4_pcie_common_deinit' [-Wmissing-prototypes] 197 | void rcar_gen4_pcie_common_deinit(struct rcar_gen4_pcie *rcar) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> drivers/pci/controller/dwc/pcie-rcar-gen4.c:205:5: warning: no previous prototype for 'rcar_gen4_pcie_prepare' [-Wmissing-prototypes] 205 | int rcar_gen4_pcie_prepare(struct rcar_gen4_pcie *rcar) | ^~~~~~~~~~~~~~~~~~~~~~ >> drivers/pci/controller/dwc/pcie-rcar-gen4.c:220:6: warning: no previous prototype for 'rcar_gen4_pcie_unprepare' [-Wmissing-prototypes] 220 | void rcar_gen4_pcie_unprepare(struct rcar_gen4_pcie *rcar) | ^~~~~~~~~~~~~~~~~~~~~~~~ >> drivers/pci/controller/dwc/pcie-rcar-gen4.c:228:5: warning: no previous prototype for 'rcar_gen4_pcie_get_resources' [-Wmissing-prototypes] 228 | int rcar_gen4_pcie_get_resources(struct rcar_gen4_pcie *rcar) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> drivers/pci/controller/dwc/pcie-rcar-gen4.c:242:24: warning: no previous prototype for 'rcar_gen4_pcie_devm_alloc' [-Wmissing-prototypes] 242 | struct rcar_gen4_pcie *rcar_gen4_pcie_devm_alloc(struct platform_device *pdev) | ^~~~~~~~~~~~~~~~~~~~~~~~~ vim +/rcar_gen4_pcie_common_init +155 drivers/pci/controller/dwc/pcie-rcar-gen4.c 154 > 155 int rcar_gen4_pcie_common_init(struct rcar_gen4_pcie *rcar) 156 { 157 struct dw_pcie *dw = &rcar->dw; 158 u32 val; 159 int ret; 160 161 ret = clk_bulk_prepare_enable(DW_PCIE_NUM_CORE_CLKS, dw->core_clks); 162 if (ret) { 163 dev_err(dw->dev, "Failed to enable ref clocks\n"); 164 return ret; 165 } 166 167 if (!reset_control_status(dw->core_rsts[DW_PCIE_PWR_RST].rstc)) 168 reset_control_assert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); 169 170 val = readl(rcar->base + PCIEMSR0); 171 if (rcar->mode == DW_PCIE_RC_TYPE) { 172 val |= DEVICE_TYPE_RC; 173 } else if (rcar->mode == DW_PCIE_EP_TYPE) { 174 val |= DEVICE_TYPE_EP; 175 } else { 176 ret = -EINVAL; 177 goto err_unprepare; 178 } 179 180 if (dw->num_lanes < 4) 181 val |= BIFUR_MOD_SET_ON; 182 183 writel(val, rcar->base + PCIEMSR0); 184 185 ret = reset_control_deassert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); 186 if (ret) 187 goto err_unprepare; 188 189 return 0; 190 191 err_unprepare: 192 clk_bulk_disable_unprepare(DW_PCIE_NUM_CORE_CLKS, dw->core_clks); 193 194 return ret; 195 } 196 > 197 void rcar_gen4_pcie_common_deinit(struct rcar_gen4_pcie *rcar) 198 { 199 struct dw_pcie *dw = &rcar->dw; 200 201 reset_control_assert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); 202 clk_bulk_disable_unprepare(DW_PCIE_NUM_CORE_CLKS, dw->core_clks); 203 } 204 > 205 int rcar_gen4_pcie_prepare(struct rcar_gen4_pcie *rcar) 206 { 207 struct device *dev = rcar->dw.dev; 208 int err; 209 210 pm_runtime_enable(dev); 211 err = pm_runtime_resume_and_get(dev); 212 if (err < 0) { 213 dev_err(dev, "Failed to resume/get Runtime PM\n"); 214 pm_runtime_disable(dev); 215 } 216 217 return err; 218 } 219 > 220 void rcar_gen4_pcie_unprepare(struct rcar_gen4_pcie *rcar) 221 { 222 struct device *dev = rcar->dw.dev; 223 224 pm_runtime_put(dev); 225 pm_runtime_disable(dev); 226 } 227 > 228 int rcar_gen4_pcie_get_resources(struct rcar_gen4_pcie *rcar) 229 { 230 /* Renesas-specific registers */ 231 rcar->base = devm_platform_ioremap_resource_byname(rcar->pdev, "app"); 232 233 return PTR_ERR_OR_ZERO(rcar->base); 234 } 235 236 static const struct dw_pcie_ops dw_pcie_ops = { 237 .start_link = rcar_gen4_pcie_start_link, 238 .stop_link = rcar_gen4_pcie_stop_link, 239 .link_up = rcar_gen4_pcie_link_up, 240 }; 241 > 242 struct rcar_gen4_pcie *rcar_gen4_pcie_devm_alloc(struct platform_device *pdev) 243 { 244 struct device *dev = &pdev->dev; 245 struct rcar_gen4_pcie *rcar; 246 247 rcar = devm_kzalloc(dev, sizeof(*rcar), GFP_KERNEL); 248 if (!rcar) 249 return ERR_PTR(-ENOMEM); 250 251 rcar->dw.ops = &dw_pcie_ops; 252 rcar->dw.dev = dev; 253 rcar->pdev = pdev; 254 dw_pcie_cap_set(&rcar->dw, EDMA_UNROLL); 255 dw_pcie_cap_set(&rcar->dw, REQ_RES); 256 platform_set_drvdata(pdev, rcar); 257 258 return rcar; 259 } 260
Hi kerenl test robot, > From: kernel test robot, Sent: Friday, September 22, 2023 10:47 PM > > Hi Yoshihiro, > > kernel test robot noticed the following build warnings: > > [auto build test WARNING on pci/next] > [also build test WARNING on pci/for-linus linus/master v6.6-rc2 next-20230921] > [If your patch is applied to the wrong git tree, kindly drop us a note. > And when submitting patch, we suggest to use '--base' as documented in <snip URLs>] > > url: ... > base: ... next > patch link: ... > patch subject: [PATCH v21 13/16] PCI: dwc: rcar-gen4: Add R-Car Gen4 PCIe controller support > config: sparc-allyesconfig ... > compiler: sparc64-linux-gcc (GCC) 13.2.0 > reproduce (this is a W=1 build): ... > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot <lkp@intel.com> > | Closes: ... > > All warnings (new ones prefixed by >>): > > >> drivers/pci/controller/dwc/pcie-rcar-gen4.c:155:5: warning: no previous prototype for 'rcar_gen4_pcie_common_init' > [-Wmissing-prototypes] > 155 | int rcar_gen4_pcie_common_init(struct rcar_gen4_pcie *rcar) > | ^~~~~~~~~~~~~~~~~~~~~~~~~~ > >> drivers/pci/controller/dwc/pcie-rcar-gen4.c:197:6: warning: no previous prototype for 'rcar_gen4_pcie_common_deinit' > [-Wmissing-prototypes] > 197 | void rcar_gen4_pcie_common_deinit(struct rcar_gen4_pcie *rcar) > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ > >> drivers/pci/controller/dwc/pcie-rcar-gen4.c:205:5: warning: no previous prototype for 'rcar_gen4_pcie_prepare' > [-Wmissing-prototypes] > 205 | int rcar_gen4_pcie_prepare(struct rcar_gen4_pcie *rcar) > | ^~~~~~~~~~~~~~~~~~~~~~ > >> drivers/pci/controller/dwc/pcie-rcar-gen4.c:220:6: warning: no previous prototype for 'rcar_gen4_pcie_unprepare' > [-Wmissing-prototypes] > 220 | void rcar_gen4_pcie_unprepare(struct rcar_gen4_pcie *rcar) > | ^~~~~~~~~~~~~~~~~~~~~~~~ > >> drivers/pci/controller/dwc/pcie-rcar-gen4.c:228:5: warning: no previous prototype for 'rcar_gen4_pcie_get_resources' > [-Wmissing-prototypes] > 228 | int rcar_gen4_pcie_get_resources(struct rcar_gen4_pcie *rcar) > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ > >> drivers/pci/controller/dwc/pcie-rcar-gen4.c:242:24: warning: no previous prototype for 'rcar_gen4_pcie_devm_alloc' > [-Wmissing-prototypes] > 242 | struct rcar_gen4_pcie *rcar_gen4_pcie_devm_alloc(struct platform_device *pdev) > | ^~~~~~~~~~~~~~~~~~~~~~~~~ Thank you for the review! I should have added "static" to each function. I'll submit v22 patch series later. Best regards, Yoshihiro Shimoda > > vim +/rcar_gen4_pcie_common_init +155 drivers/pci/controller/dwc/pcie-rcar-gen4.c > > 154 > > 155 int rcar_gen4_pcie_common_init(struct rcar_gen4_pcie *rcar) > 156 { > 157 struct dw_pcie *dw = &rcar->dw; > 158 u32 val; > 159 int ret; > 160 > 161 ret = clk_bulk_prepare_enable(DW_PCIE_NUM_CORE_CLKS, dw->core_clks); > 162 if (ret) { > 163 dev_err(dw->dev, "Failed to enable ref clocks\n"); > 164 return ret; > 165 } > 166 > 167 if (!reset_control_status(dw->core_rsts[DW_PCIE_PWR_RST].rstc)) > 168 reset_control_assert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); > 169 > 170 val = readl(rcar->base + PCIEMSR0); > 171 if (rcar->mode == DW_PCIE_RC_TYPE) { > 172 val |= DEVICE_TYPE_RC; > 173 } else if (rcar->mode == DW_PCIE_EP_TYPE) { > 174 val |= DEVICE_TYPE_EP; > 175 } else { > 176 ret = -EINVAL; > 177 goto err_unprepare; > 178 } > 179 > 180 if (dw->num_lanes < 4) > 181 val |= BIFUR_MOD_SET_ON; > 182 > 183 writel(val, rcar->base + PCIEMSR0); > 184 > 185 ret = reset_control_deassert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); > 186 if (ret) > 187 goto err_unprepare; > 188 > 189 return 0; > 190 > 191 err_unprepare: > 192 clk_bulk_disable_unprepare(DW_PCIE_NUM_CORE_CLKS, dw->core_clks); > 193 > 194 return ret; > 195 } > 196 > > 197 void rcar_gen4_pcie_common_deinit(struct rcar_gen4_pcie *rcar) > 198 { > 199 struct dw_pcie *dw = &rcar->dw; > 200 > 201 reset_control_assert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); > 202 clk_bulk_disable_unprepare(DW_PCIE_NUM_CORE_CLKS, dw->core_clks); > 203 } > 204 > > 205 int rcar_gen4_pcie_prepare(struct rcar_gen4_pcie *rcar) > 206 { > 207 struct device *dev = rcar->dw.dev; > 208 int err; > 209 > 210 pm_runtime_enable(dev); > 211 err = pm_runtime_resume_and_get(dev); > 212 if (err < 0) { > 213 dev_err(dev, "Failed to resume/get Runtime PM\n"); > 214 pm_runtime_disable(dev); > 215 } > 216 > 217 return err; > 218 } > 219 > > 220 void rcar_gen4_pcie_unprepare(struct rcar_gen4_pcie *rcar) > 221 { > 222 struct device *dev = rcar->dw.dev; > 223 > 224 pm_runtime_put(dev); > 225 pm_runtime_disable(dev); > 226 } > 227 > > 228 int rcar_gen4_pcie_get_resources(struct rcar_gen4_pcie *rcar) > 229 { > 230 /* Renesas-specific registers */ > 231 rcar->base = devm_platform_ioremap_resource_byname(rcar->pdev, "app"); > 232 > 233 return PTR_ERR_OR_ZERO(rcar->base); > 234 } > 235 > 236 static const struct dw_pcie_ops dw_pcie_ops = { > 237 .start_link = rcar_gen4_pcie_start_link, > 238 .stop_link = rcar_gen4_pcie_stop_link, > 239 .link_up = rcar_gen4_pcie_link_up, > 240 }; > 241 > > 242 struct rcar_gen4_pcie *rcar_gen4_pcie_devm_alloc(struct platform_device *pdev) > 243 { > 244 struct device *dev = &pdev->dev; > 245 struct rcar_gen4_pcie *rcar; > 246 > 247 rcar = devm_kzalloc(dev, sizeof(*rcar), GFP_KERNEL); > 248 if (!rcar) > 249 return ERR_PTR(-ENOMEM); > 250 > 251 rcar->dw.ops = &dw_pcie_ops; > 252 rcar->dw.dev = dev; > 253 rcar->pdev = pdev; > 254 dw_pcie_cap_set(&rcar->dw, EDMA_UNROLL); > 255 dw_pcie_cap_set(&rcar->dw, REQ_RES); > 256 platform_set_drvdata(pdev, rcar); > 257 > 258 return rcar; > 259 } > 260 > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki > %7Cyoshihiro.shimoda.uh%40renesas.com%7Cbcb9117ada5545f21dd908dbbb7279cf%7C53d82571da1947e49cb4625a166a4a2a%7C0%7C0% > 7C638309872567098849%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C30 > 00%7C%7C%7C&sdata=hZzw8jndtIs8RuMO9fvilRhybUCLFgA7gEyUSEdxZuI%3D&reserved=0
On Fri, Sep 22, 2023 at 03:53:28PM +0900, Yoshihiro Shimoda wrote: > Add R-Car Gen4 PCIe controller support for host mode. > > This controller is based on Synopsys DesignWare PCIe. However, this > particular controller has a number of vendor-specific registers, and as > such, requires initialization code like mode setting and retraining and > so on. > > [kwilczynski: commit log] > Link: https://lore.kernel.org/linux-pci/20230825093219.2685912-17-yoshihiro.shimoda.uh@renesas.com > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> > Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> > Reviewed-by: Serge Semin <fancer.lancer@gmail.com> > --- > drivers/pci/controller/dwc/Kconfig | 14 + > drivers/pci/controller/dwc/Makefile | 1 + > drivers/pci/controller/dwc/pcie-rcar-gen4.c | 380 ++++++++++++++++++++ > 3 files changed, 395 insertions(+) > create mode 100644 drivers/pci/controller/dwc/pcie-rcar-gen4.c > > diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig > index ab96da43e0c2..bc69fcab2e2a 100644 > --- a/drivers/pci/controller/dwc/Kconfig > +++ b/drivers/pci/controller/dwc/Kconfig > @@ -415,4 +415,18 @@ config PCIE_VISCONTI_HOST > Say Y here if you want PCIe controller support on Toshiba Visconti SoC. > This driver supports TMPV7708 SoC. > > +config PCIE_RCAR_GEN4 > + tristate > + > +config PCIE_RCAR_GEN4_HOST > + tristate "Renesas R-Car Gen4 PCIe controller (host mode)" > + depends on ARCH_RENESAS || COMPILE_TEST > + depends on PCI_MSI > + select PCIE_DW_HOST > + select PCIE_RCAR_GEN4 > + help > + Say Y here if you want PCIe controller (host mode) on R-Car Gen4 SoCs. > + To compile this driver as a module, choose M here: the module will be > + called pcie-rcar-gen4.ko. This uses the DesignWare core. > + > endmenu > diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile > index bf5c311875a1..bac103faa523 100644 > --- a/drivers/pci/controller/dwc/Makefile > +++ b/drivers/pci/controller/dwc/Makefile > @@ -26,6 +26,7 @@ obj-$(CONFIG_PCIE_TEGRA194) += pcie-tegra194.o > obj-$(CONFIG_PCIE_UNIPHIER) += pcie-uniphier.o > obj-$(CONFIG_PCIE_UNIPHIER_EP) += pcie-uniphier-ep.o > obj-$(CONFIG_PCIE_VISCONTI_HOST) += pcie-visconti.o > +obj-$(CONFIG_PCIE_RCAR_GEN4) += pcie-rcar-gen4.o > > # The following drivers are for devices that use the generic ACPI > # pci_root.c driver but don't support standard ECAM config access. > diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c > new file mode 100644 > index 000000000000..dfff6bb18932 > --- /dev/null > +++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c > @@ -0,0 +1,380 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * PCIe controller driver for Renesas R-Car Gen4 Series SoCs > + * Copyright (C) 2022-2023 Renesas Electronics Corporation > + */ > + > +#include <linux/delay.h> > +#include <linux/interrupt.h> > +#include <linux/io.h> > +#include <linux/module.h> > +#include <linux/of_device.h> > +#include <linux/pci.h> > +#include <linux/platform_device.h> > +#include <linux/pm_runtime.h> > +#include <linux/reset.h> > + > +#include "../../pci.h" > +#include "pcie-designware.h" > + > +/* Renesas-specific */ > +/* PCIe Mode Setting Register 0 */ > +#define PCIEMSR0 0x0000 > +#define BIFUR_MOD_SET_ON BIT(0) > +#define DEVICE_TYPE_EP 0 > +#define DEVICE_TYPE_RC BIT(4) > + > +/* PCIe Interrupt Status 0 */ > +#define PCIEINTSTS0 0x0084 > + > +/* PCIe Interrupt Status 0 Enable */ > +#define PCIEINTSTS0EN 0x0310 > +#define MSI_CTRL_INT BIT(26) > +#define SMLH_LINK_UP BIT(7) > +#define RDLH_LINK_UP BIT(6) > + > +/* PCIe DMA Interrupt Status Enable */ > +#define PCIEDMAINTSTSEN 0x0314 > +#define PCIEDMAINTSTSEN_INIT GENMASK(15, 0) > + > +/* PCIe Reset Control Register 1 */ > +#define PCIERSTCTRL1 0x0014 > +#define APP_HOLD_PHY_RST BIT(16) > +#define APP_LTSSM_ENABLE BIT(0) > + > +#define RCAR_NUM_SPEED_CHANGE_RETRIES 10 > +#define RCAR_MAX_LINK_SPEED 4 > + > +struct rcar_gen4_pcie { > + struct dw_pcie dw; > + void __iomem *base; > + struct platform_device *pdev; > + enum dw_pcie_device_mode mode; > +}; > +#define to_rcar_gen4_pcie(_dw) container_of(_dw, struct rcar_gen4_pcie, dw) > + > +static void rcar_gen4_pcie_ltssm_enable(struct rcar_gen4_pcie *rcar, > + bool enable) > +{ > + u32 val; > + > + val = readl(rcar->base + PCIERSTCTRL1); > + if (enable) { > + val |= APP_LTSSM_ENABLE; > + val &= ~APP_HOLD_PHY_RST; > + } else { > + /* > + * Since the datasheet of R-Car doesn't mention how to assert > + * the APP_HOLD_PHY_RST, don't assert it again. Otherwise, > + * hang-up issue happened in the dw_edma_core_off() when > + * the controller didn't detect a PCI device. > + */ > + val &= ~APP_LTSSM_ENABLE; > + } > + writel(val, rcar->base + PCIERSTCTRL1); > +} > + > +static int rcar_gen4_pcie_link_up(struct dw_pcie *dw) > +{ > + struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw); > + u32 val, mask; > + > + val = readl(rcar->base + PCIEINTSTS0); > + mask = RDLH_LINK_UP | SMLH_LINK_UP; > + > + return (val & mask) == mask; > +} > + > +/* > + * Manually initiate the speed change. Return true if the change succeeded, > + * false if the change didn't finish within certain periods. This function returns 0 in success case and -ETIMEDOUT for failure. So the comment should be fixed. > + */ > +static int rcar_gen4_pcie_speed_change(struct dw_pcie *dw) > +{ > + u32 val; > + int i; > + > + val = dw_pcie_readl_dbi(dw, PCIE_LINK_WIDTH_SPEED_CONTROL); > + val &= ~PORT_LOGIC_SPEED_CHANGE; > + dw_pcie_writel_dbi(dw, PCIE_LINK_WIDTH_SPEED_CONTROL, val); > + > + val = dw_pcie_readl_dbi(dw, PCIE_LINK_WIDTH_SPEED_CONTROL); > + val |= PORT_LOGIC_SPEED_CHANGE; > + dw_pcie_writel_dbi(dw, PCIE_LINK_WIDTH_SPEED_CONTROL, val); > + > + for (i = 0; i < RCAR_NUM_SPEED_CHANGE_RETRIES; i++) { > + val = dw_pcie_readl_dbi(dw, PCIE_LINK_WIDTH_SPEED_CONTROL); > + if (!(val & PORT_LOGIC_SPEED_CHANGE)) > + return 0; > + usleep_range(10000, 11000); > + } > + > + return -ETIMEDOUT; > +} > + > +/* > + * Enable LTSSM of this controller and manually initiate the speed change. > + * Always return 0. > + */ > +static int rcar_gen4_pcie_start_link(struct dw_pcie *dw) > +{ > + struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw); > + int i, changes; > + > + rcar_gen4_pcie_ltssm_enable(rcar, true); > + > + /* > + * Require direct speed change with retrying here if the link_gen is > + * PCIe Gen2 or higher. > + */ > + changes = min_not_zero(dw->link_gen, RCAR_MAX_LINK_SPEED) - 1; > + > + /* > + * Since dw_pcie_setup_rc() sets it once, PCIe Gen2 will be trained. > + * So, this needs remaining times for up to PCIe Gen4 if RC mode. > + */ > + if (changes && rcar->mode == DW_PCIE_RC_TYPE) > + changes--; > + > + for (i = 0; i < changes; i++) { > + /* No error because possible disconnected here if EP mode */ This comment is not grammatically correct. > + if (rcar_gen4_pcie_speed_change(dw)) > + break; > + } > + > + return 0; > +} > + > +static void rcar_gen4_pcie_stop_link(struct dw_pcie *dw) > +{ > + struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw); > + > + rcar_gen4_pcie_ltssm_enable(rcar, false); > +} > + > +int rcar_gen4_pcie_common_init(struct rcar_gen4_pcie *rcar) > +{ > + struct dw_pcie *dw = &rcar->dw; > + u32 val; > + int ret; > + > + ret = clk_bulk_prepare_enable(DW_PCIE_NUM_CORE_CLKS, dw->core_clks); > + if (ret) { > + dev_err(dw->dev, "Failed to enable ref clocks\n"); Not all clocks are reference clocks. > + return ret; > + } > + > + if (!reset_control_status(dw->core_rsts[DW_PCIE_PWR_RST].rstc)) > + reset_control_assert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); > + > + val = readl(rcar->base + PCIEMSR0); > + if (rcar->mode == DW_PCIE_RC_TYPE) { > + val |= DEVICE_TYPE_RC; > + } else if (rcar->mode == DW_PCIE_EP_TYPE) { > + val |= DEVICE_TYPE_EP; > + } else { > + ret = -EINVAL; > + goto err_unprepare; > + } > + > + if (dw->num_lanes < 4) > + val |= BIFUR_MOD_SET_ON; > + > + writel(val, rcar->base + PCIEMSR0); > + > + ret = reset_control_deassert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); > + if (ret) > + goto err_unprepare; > + > + return 0; > + > +err_unprepare: > + clk_bulk_disable_unprepare(DW_PCIE_NUM_CORE_CLKS, dw->core_clks); > + > + return ret; > +} > + > +void rcar_gen4_pcie_common_deinit(struct rcar_gen4_pcie *rcar) > +{ > + struct dw_pcie *dw = &rcar->dw; > + > + reset_control_assert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); > + clk_bulk_disable_unprepare(DW_PCIE_NUM_CORE_CLKS, dw->core_clks); > +} > + > +int rcar_gen4_pcie_prepare(struct rcar_gen4_pcie *rcar) > +{ > + struct device *dev = rcar->dw.dev; > + int err; > + > + pm_runtime_enable(dev); > + err = pm_runtime_resume_and_get(dev); > + if (err < 0) { > + dev_err(dev, "Failed to resume/get Runtime PM\n"); "Runtime resume failed\n" > + pm_runtime_disable(dev); > + } > + > + return err; > +} > + > +void rcar_gen4_pcie_unprepare(struct rcar_gen4_pcie *rcar) > +{ > + struct device *dev = rcar->dw.dev; > + > + pm_runtime_put(dev); > + pm_runtime_disable(dev); > +} > + > +int rcar_gen4_pcie_get_resources(struct rcar_gen4_pcie *rcar) > +{ > + /* Renesas-specific registers */ > + rcar->base = devm_platform_ioremap_resource_byname(rcar->pdev, "app"); > + > + return PTR_ERR_OR_ZERO(rcar->base); > +} > + > +static const struct dw_pcie_ops dw_pcie_ops = { > + .start_link = rcar_gen4_pcie_start_link, > + .stop_link = rcar_gen4_pcie_stop_link, > + .link_up = rcar_gen4_pcie_link_up, > +}; > + > +struct rcar_gen4_pcie *rcar_gen4_pcie_devm_alloc(struct platform_device *pdev) You should not name the functions based on the internal APIs. Please use something like, rcar_gen4_pcie_drv_alloc() or just rcar_gen4_pcie_alloc(). > +{ > + struct device *dev = &pdev->dev; > + struct rcar_gen4_pcie *rcar; > + > + rcar = devm_kzalloc(dev, sizeof(*rcar), GFP_KERNEL); > + if (!rcar) > + return ERR_PTR(-ENOMEM); > + > + rcar->dw.ops = &dw_pcie_ops; > + rcar->dw.dev = dev; > + rcar->pdev = pdev; > + dw_pcie_cap_set(&rcar->dw, EDMA_UNROLL); > + dw_pcie_cap_set(&rcar->dw, REQ_RES); > + platform_set_drvdata(pdev, rcar); > + > + return rcar; > +} > + > +/* Host mode */ > +static int rcar_gen4_pcie_host_init(struct dw_pcie_rp *pp) > +{ > + struct dw_pcie *dw = to_dw_pcie_from_pp(pp); > + struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw); > + int ret; > + u32 val; > + > + gpiod_set_value_cansleep(dw->pe_rst, 1); > + > + ret = rcar_gen4_pcie_common_init(rcar); > + if (ret) > + return ret; > + > + /* > + * According to the section 3.5.7.2 "RC Mode" in DWC PCIe Dual Mode > + * Rev.5.20a, we should disable two BARs to avoid unnecessary memory > + * assignment during device enumeration. > + */ > + dw_pcie_writel_dbi2(dw, PCI_BASE_ADDRESS_0, 0x0); > + dw_pcie_writel_dbi2(dw, PCI_BASE_ADDRESS_1, 0x0); If this is DWC specific, can we move it to the common code? > + > + /* Enable MSI interrupt signal */ > + val = readl(rcar->base + PCIEINTSTS0EN); > + val |= MSI_CTRL_INT; > + writel(val, rcar->base + PCIEINTSTS0EN); > + Above should be guarded with: if (IS_ENABLED(CONFIG_PCI_MSI)) { ... } - Mani
Hello Manivannan, > From: Manivannan Sadhasivam, Sent: Tuesday, October 10, 2023 9:04 PM > > On Fri, Sep 22, 2023 at 03:53:28PM +0900, Yoshihiro Shimoda wrote: > > Add R-Car Gen4 PCIe controller support for host mode. > > > > This controller is based on Synopsys DesignWare PCIe. However, this > > particular controller has a number of vendor-specific registers, and as > > such, requires initialization code like mode setting and retraining and > > so on. > > > > [kwilczynski: commit log] > > Link: <snip URL> > > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> > > Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> > > Reviewed-by: Serge Semin <fancer.lancer@gmail.com> > > --- > > drivers/pci/controller/dwc/Kconfig | 14 + > > drivers/pci/controller/dwc/Makefile | 1 + > > drivers/pci/controller/dwc/pcie-rcar-gen4.c | 380 ++++++++++++++++++++ > > 3 files changed, 395 insertions(+) > > create mode 100644 drivers/pci/controller/dwc/pcie-rcar-gen4.c > > > > diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig > > index ab96da43e0c2..bc69fcab2e2a 100644 > > --- a/drivers/pci/controller/dwc/Kconfig > > +++ b/drivers/pci/controller/dwc/Kconfig > > @@ -415,4 +415,18 @@ config PCIE_VISCONTI_HOST > > Say Y here if you want PCIe controller support on Toshiba Visconti SoC. > > This driver supports TMPV7708 SoC. > > > > +config PCIE_RCAR_GEN4 > > + tristate > > + > > +config PCIE_RCAR_GEN4_HOST > > + tristate "Renesas R-Car Gen4 PCIe controller (host mode)" > > + depends on ARCH_RENESAS || COMPILE_TEST > > + depends on PCI_MSI > > + select PCIE_DW_HOST > > + select PCIE_RCAR_GEN4 > > + help > > + Say Y here if you want PCIe controller (host mode) on R-Car Gen4 SoCs. > > + To compile this driver as a module, choose M here: the module will be > > + called pcie-rcar-gen4.ko. This uses the DesignWare core. > > + > > endmenu > > diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile > > index bf5c311875a1..bac103faa523 100644 > > --- a/drivers/pci/controller/dwc/Makefile > > +++ b/drivers/pci/controller/dwc/Makefile > > @@ -26,6 +26,7 @@ obj-$(CONFIG_PCIE_TEGRA194) += pcie-tegra194.o > > obj-$(CONFIG_PCIE_UNIPHIER) += pcie-uniphier.o > > obj-$(CONFIG_PCIE_UNIPHIER_EP) += pcie-uniphier-ep.o > > obj-$(CONFIG_PCIE_VISCONTI_HOST) += pcie-visconti.o > > +obj-$(CONFIG_PCIE_RCAR_GEN4) += pcie-rcar-gen4.o > > > > # The following drivers are for devices that use the generic ACPI > > # pci_root.c driver but don't support standard ECAM config access. > > diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c > > new file mode 100644 > > index 000000000000..dfff6bb18932 > > --- /dev/null > > +++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c > > @@ -0,0 +1,380 @@ > > +// SPDX-License-Identifier: GPL-2.0-only > > +/* > > + * PCIe controller driver for Renesas R-Car Gen4 Series SoCs > > + * Copyright (C) 2022-2023 Renesas Electronics Corporation > > + */ > > + > > +#include <linux/delay.h> > > +#include <linux/interrupt.h> > > +#include <linux/io.h> > > +#include <linux/module.h> > > +#include <linux/of_device.h> > > +#include <linux/pci.h> > > +#include <linux/platform_device.h> > > +#include <linux/pm_runtime.h> > > +#include <linux/reset.h> > > + > > +#include "../../pci.h" > > +#include "pcie-designware.h" > > + > > +/* Renesas-specific */ > > +/* PCIe Mode Setting Register 0 */ > > +#define PCIEMSR0 0x0000 > > +#define BIFUR_MOD_SET_ON BIT(0) > > +#define DEVICE_TYPE_EP 0 > > +#define DEVICE_TYPE_RC BIT(4) > > + > > +/* PCIe Interrupt Status 0 */ > > +#define PCIEINTSTS0 0x0084 > > + > > +/* PCIe Interrupt Status 0 Enable */ > > +#define PCIEINTSTS0EN 0x0310 > > +#define MSI_CTRL_INT BIT(26) > > +#define SMLH_LINK_UP BIT(7) > > +#define RDLH_LINK_UP BIT(6) > > + > > +/* PCIe DMA Interrupt Status Enable */ > > +#define PCIEDMAINTSTSEN 0x0314 > > +#define PCIEDMAINTSTSEN_INIT GENMASK(15, 0) > > + > > +/* PCIe Reset Control Register 1 */ > > +#define PCIERSTCTRL1 0x0014 > > +#define APP_HOLD_PHY_RST BIT(16) > > +#define APP_LTSSM_ENABLE BIT(0) > > + > > +#define RCAR_NUM_SPEED_CHANGE_RETRIES 10 > > +#define RCAR_MAX_LINK_SPEED 4 > > + > > +struct rcar_gen4_pcie { > > + struct dw_pcie dw; > > + void __iomem *base; > > + struct platform_device *pdev; > > + enum dw_pcie_device_mode mode; > > +}; > > +#define to_rcar_gen4_pcie(_dw) container_of(_dw, struct rcar_gen4_pcie, dw) > > + > > +static void rcar_gen4_pcie_ltssm_enable(struct rcar_gen4_pcie *rcar, > > + bool enable) > > +{ > > + u32 val; > > + > > + val = readl(rcar->base + PCIERSTCTRL1); > > + if (enable) { > > + val |= APP_LTSSM_ENABLE; > > + val &= ~APP_HOLD_PHY_RST; > > + } else { > > + /* > > + * Since the datasheet of R-Car doesn't mention how to assert > > + * the APP_HOLD_PHY_RST, don't assert it again. Otherwise, > > + * hang-up issue happened in the dw_edma_core_off() when > > + * the controller didn't detect a PCI device. > > + */ > > + val &= ~APP_LTSSM_ENABLE; > > + } > > + writel(val, rcar->base + PCIERSTCTRL1); > > +} > > + > > +static int rcar_gen4_pcie_link_up(struct dw_pcie *dw) > > +{ > > + struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw); > > + u32 val, mask; > > + > > + val = readl(rcar->base + PCIEINTSTS0); > > + mask = RDLH_LINK_UP | SMLH_LINK_UP; > > + > > + return (val & mask) == mask; > > +} > > + > > +/* > > + * Manually initiate the speed change. Return true if the change succeeded, > > + * false if the change didn't finish within certain periods. > > This function returns 0 in success case and -ETIMEDOUT for failure. So the > comment should be fixed. Thank you for your comment! I also got a comment from Bjorn [1]. So, I'll fix it and submit patch series as v24. [1] https://lore.kernel.org/linux-pci/20231005150907.GA746291@bhelgaas/ > > + */ > > +static int rcar_gen4_pcie_speed_change(struct dw_pcie *dw) > > +{ > > + u32 val; > > + int i; > > + > > + val = dw_pcie_readl_dbi(dw, PCIE_LINK_WIDTH_SPEED_CONTROL); > > + val &= ~PORT_LOGIC_SPEED_CHANGE; > > + dw_pcie_writel_dbi(dw, PCIE_LINK_WIDTH_SPEED_CONTROL, val); > > + > > + val = dw_pcie_readl_dbi(dw, PCIE_LINK_WIDTH_SPEED_CONTROL); > > + val |= PORT_LOGIC_SPEED_CHANGE; > > + dw_pcie_writel_dbi(dw, PCIE_LINK_WIDTH_SPEED_CONTROL, val); > > + > > + for (i = 0; i < RCAR_NUM_SPEED_CHANGE_RETRIES; i++) { > > + val = dw_pcie_readl_dbi(dw, PCIE_LINK_WIDTH_SPEED_CONTROL); > > + if (!(val & PORT_LOGIC_SPEED_CHANGE)) > > + return 0; > > + usleep_range(10000, 11000); > > + } > > + > > + return -ETIMEDOUT; > > +} > > + > > +/* > > + * Enable LTSSM of this controller and manually initiate the speed change. > > + * Always return 0. > > + */ > > +static int rcar_gen4_pcie_start_link(struct dw_pcie *dw) > > +{ > > + struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw); > > + int i, changes; > > + > > + rcar_gen4_pcie_ltssm_enable(rcar, true); > > + > > + /* > > + * Require direct speed change with retrying here if the link_gen is > > + * PCIe Gen2 or higher. > > + */ > > + changes = min_not_zero(dw->link_gen, RCAR_MAX_LINK_SPEED) - 1; > > + > > + /* > > + * Since dw_pcie_setup_rc() sets it once, PCIe Gen2 will be trained. > > + * So, this needs remaining times for up to PCIe Gen4 if RC mode. > > + */ > > + if (changes && rcar->mode == DW_PCIE_RC_TYPE) > > + changes--; > > + > > + for (i = 0; i < changes; i++) { > > + /* No error because possible disconnected here if EP mode */ > > This comment is not grammatically correct. I'll fix this comment. > > + if (rcar_gen4_pcie_speed_change(dw)) > > + break; > > + } > > + > > + return 0; > > +} > > + > > +static void rcar_gen4_pcie_stop_link(struct dw_pcie *dw) > > +{ > > + struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw); > > + > > + rcar_gen4_pcie_ltssm_enable(rcar, false); > > +} > > + > > +int rcar_gen4_pcie_common_init(struct rcar_gen4_pcie *rcar) > > +{ > > + struct dw_pcie *dw = &rcar->dw; > > + u32 val; > > + int ret; > > + > > + ret = clk_bulk_prepare_enable(DW_PCIE_NUM_CORE_CLKS, dw->core_clks); > > + if (ret) { > > + dev_err(dw->dev, "Failed to enable ref clocks\n"); > > Not all clocks are reference clocks. I'll fix this message. > > + return ret; > > + } > > + > > + if (!reset_control_status(dw->core_rsts[DW_PCIE_PWR_RST].rstc)) > > + reset_control_assert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); > > + > > + val = readl(rcar->base + PCIEMSR0); > > + if (rcar->mode == DW_PCIE_RC_TYPE) { > > + val |= DEVICE_TYPE_RC; > > + } else if (rcar->mode == DW_PCIE_EP_TYPE) { > > + val |= DEVICE_TYPE_EP; > > + } else { > > + ret = -EINVAL; > > + goto err_unprepare; > > + } > > + > > + if (dw->num_lanes < 4) > > + val |= BIFUR_MOD_SET_ON; > > + > > + writel(val, rcar->base + PCIEMSR0); > > + > > + ret = reset_control_deassert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); > > + if (ret) > > + goto err_unprepare; > > + > > + return 0; > > + > > +err_unprepare: > > + clk_bulk_disable_unprepare(DW_PCIE_NUM_CORE_CLKS, dw->core_clks); > > + > > + return ret; > > +} > > + > > +void rcar_gen4_pcie_common_deinit(struct rcar_gen4_pcie *rcar) > > +{ > > + struct dw_pcie *dw = &rcar->dw; > > + > > + reset_control_assert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); > > + clk_bulk_disable_unprepare(DW_PCIE_NUM_CORE_CLKS, dw->core_clks); > > +} > > + > > +int rcar_gen4_pcie_prepare(struct rcar_gen4_pcie *rcar) > > +{ > > + struct device *dev = rcar->dw.dev; > > + int err; > > + > > + pm_runtime_enable(dev); > > + err = pm_runtime_resume_and_get(dev); > > + if (err < 0) { > > + dev_err(dev, "Failed to resume/get Runtime PM\n"); > > "Runtime resume failed\n" Thank you for your suggestion. I'll fix it. > > + pm_runtime_disable(dev); > > + } > > + > > + return err; > > +} > > + > > +void rcar_gen4_pcie_unprepare(struct rcar_gen4_pcie *rcar) > > +{ > > + struct device *dev = rcar->dw.dev; > > + > > + pm_runtime_put(dev); > > + pm_runtime_disable(dev); > > +} > > + > > +int rcar_gen4_pcie_get_resources(struct rcar_gen4_pcie *rcar) > > +{ > > + /* Renesas-specific registers */ > > + rcar->base = devm_platform_ioremap_resource_byname(rcar->pdev, "app"); > > + > > + return PTR_ERR_OR_ZERO(rcar->base); > > +} > > + > > +static const struct dw_pcie_ops dw_pcie_ops = { > > + .start_link = rcar_gen4_pcie_start_link, > > + .stop_link = rcar_gen4_pcie_stop_link, > > + .link_up = rcar_gen4_pcie_link_up, > > +}; > > + > > +struct rcar_gen4_pcie *rcar_gen4_pcie_devm_alloc(struct platform_device *pdev) > > You should not name the functions based on the internal APIs. Please use > something like, rcar_gen4_pcie_drv_alloc() or just rcar_gen4_pcie_alloc(). I got it. I'll rename this function name. > > +{ > > + struct device *dev = &pdev->dev; > > + struct rcar_gen4_pcie *rcar; > > + > > + rcar = devm_kzalloc(dev, sizeof(*rcar), GFP_KERNEL); > > + if (!rcar) > > + return ERR_PTR(-ENOMEM); > > + > > + rcar->dw.ops = &dw_pcie_ops; > > + rcar->dw.dev = dev; > > + rcar->pdev = pdev; > > + dw_pcie_cap_set(&rcar->dw, EDMA_UNROLL); > > + dw_pcie_cap_set(&rcar->dw, REQ_RES); > > + platform_set_drvdata(pdev, rcar); > > + > > + return rcar; > > +} > > + > > +/* Host mode */ > > +static int rcar_gen4_pcie_host_init(struct dw_pcie_rp *pp) > > +{ > > + struct dw_pcie *dw = to_dw_pcie_from_pp(pp); > > + struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw); > > + int ret; > > + u32 val; > > + > > + gpiod_set_value_cansleep(dw->pe_rst, 1); > > + > > + ret = rcar_gen4_pcie_common_init(rcar); > > + if (ret) > > + return ret; > > + > > + /* > > + * According to the section 3.5.7.2 "RC Mode" in DWC PCIe Dual Mode > > + * Rev.5.20a, we should disable two BARs to avoid unnecessary memory > > + * assignment during device enumeration. > > + */ > > + dw_pcie_writel_dbi2(dw, PCI_BASE_ADDRESS_0, 0x0); > > + dw_pcie_writel_dbi2(dw, PCI_BASE_ADDRESS_1, 0x0); > > If this is DWC specific, can we move it to the common code? Hmm, it seems so. However, I didn't find any similar code on other DWC drivers. So, for now, moving it to the common code is not needed, I think. > > + > > + /* Enable MSI interrupt signal */ > > + val = readl(rcar->base + PCIEINTSTS0EN); > > + val |= MSI_CTRL_INT; > > + writel(val, rcar->base + PCIEINTSTS0EN); > > + > > Above should be guarded with: > > if (IS_ENABLED(CONFIG_PCI_MSI)) { > ... > } Since this driver depends on PCI_MSI by Kconfig, such a IS_ENABLED is not needed. This is from your suggestion ;) [2] [2] https://lore.kernel.org/linux-devicetree/20230724122820.GM6291@thinkpad/ Best regards, Yoshihiro Shimoda > - Mani > > -- > மணிவண்ணன் சதாசிவம்
On Wed, Oct 11, 2023 at 01:18:11AM +0000, Yoshihiro Shimoda wrote: > Hello Manivannan, > > > From: Manivannan Sadhasivam, Sent: Tuesday, October 10, 2023 9:04 PM > > > > On Fri, Sep 22, 2023 at 03:53:28PM +0900, Yoshihiro Shimoda wrote: > > > Add R-Car Gen4 PCIe controller support for host mode. > > > > > > This controller is based on Synopsys DesignWare PCIe. However, this > > > particular controller has a number of vendor-specific registers, and as > > > such, requires initialization code like mode setting and retraining and > > > so on. > > > > > > [kwilczynski: commit log] > > > Link: > <snip URL> > > > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> > > > Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> > > > Reviewed-by: Serge Semin <fancer.lancer@gmail.com> > > > --- > > > drivers/pci/controller/dwc/Kconfig | 14 + > > > drivers/pci/controller/dwc/Makefile | 1 + > > > drivers/pci/controller/dwc/pcie-rcar-gen4.c | 380 ++++++++++++++++++++ > > > 3 files changed, 395 insertions(+) > > > create mode 100644 drivers/pci/controller/dwc/pcie-rcar-gen4.c > > > > > > diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig > > > index ab96da43e0c2..bc69fcab2e2a 100644 > > > --- a/drivers/pci/controller/dwc/Kconfig > > > +++ b/drivers/pci/controller/dwc/Kconfig > > > @@ -415,4 +415,18 @@ config PCIE_VISCONTI_HOST > > > Say Y here if you want PCIe controller support on Toshiba Visconti SoC. > > > This driver supports TMPV7708 SoC. > > > > > > +config PCIE_RCAR_GEN4 > > > + tristate > > > + > > > +config PCIE_RCAR_GEN4_HOST > > > + tristate "Renesas R-Car Gen4 PCIe controller (host mode)" > > > + depends on ARCH_RENESAS || COMPILE_TEST > > > + depends on PCI_MSI > > > + select PCIE_DW_HOST > > > + select PCIE_RCAR_GEN4 > > > + help > > > + Say Y here if you want PCIe controller (host mode) on R-Car Gen4 SoCs. > > > + To compile this driver as a module, choose M here: the module will be > > > + called pcie-rcar-gen4.ko. This uses the DesignWare core. > > > + > > > endmenu > > > diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile > > > index bf5c311875a1..bac103faa523 100644 > > > --- a/drivers/pci/controller/dwc/Makefile > > > +++ b/drivers/pci/controller/dwc/Makefile > > > @@ -26,6 +26,7 @@ obj-$(CONFIG_PCIE_TEGRA194) += pcie-tegra194.o > > > obj-$(CONFIG_PCIE_UNIPHIER) += pcie-uniphier.o > > > obj-$(CONFIG_PCIE_UNIPHIER_EP) += pcie-uniphier-ep.o > > > obj-$(CONFIG_PCIE_VISCONTI_HOST) += pcie-visconti.o > > > +obj-$(CONFIG_PCIE_RCAR_GEN4) += pcie-rcar-gen4.o > > > > > > # The following drivers are for devices that use the generic ACPI > > > # pci_root.c driver but don't support standard ECAM config access. > > > diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c > > > new file mode 100644 > > > index 000000000000..dfff6bb18932 > > > --- /dev/null > > > +++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c [...] > > > +/* Host mode */ > > > +static int rcar_gen4_pcie_host_init(struct dw_pcie_rp *pp) > > > +{ > > > + struct dw_pcie *dw = to_dw_pcie_from_pp(pp); > > > + struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw); > > > + int ret; > > > + u32 val; > > > + > > > + gpiod_set_value_cansleep(dw->pe_rst, 1); > > > + > > > + ret = rcar_gen4_pcie_common_init(rcar); > > > + if (ret) > > > + return ret; > > > + > > > + /* > > > + * According to the section 3.5.7.2 "RC Mode" in DWC PCIe Dual Mode > > > + * Rev.5.20a, we should disable two BARs to avoid unnecessary memory > > > + * assignment during device enumeration. > > > + */ > > > + dw_pcie_writel_dbi2(dw, PCI_BASE_ADDRESS_0, 0x0); > > > + dw_pcie_writel_dbi2(dw, PCI_BASE_ADDRESS_1, 0x0); > > > > If this is DWC specific, can we move it to the common code? > > Hmm, it seems so. However, I didn't find any similar code on other DWC drivers. > So, for now, moving it to the common code is not needed, I think. > No. If this is as per the DWC spec, then it should be part of the common code. > > > + > > > + /* Enable MSI interrupt signal */ > > > + val = readl(rcar->base + PCIEINTSTS0EN); > > > + val |= MSI_CTRL_INT; > > > + writel(val, rcar->base + PCIEINTSTS0EN); > > > + > > > > Above should be guarded with: > > > > if (IS_ENABLED(CONFIG_PCI_MSI)) { > > ... > > } > > Since this driver depends on PCI_MSI by Kconfig, such a IS_ENABLED is not > needed. This is from your suggestion ;) [2] > > [2] https://lore.kernel.org/linux-devicetree/20230724122820.GM6291@thinkpad/ > heh... thanks for reminding me ;) - Mani
Hello Manivannan, > From: Manivannan Sadhasivam, Sent: Wednesday, October 11, 2023 1:42 PM > On Wed, Oct 11, 2023 at 01:18:11AM +0000, Yoshihiro Shimoda wrote: > > Hello Manivannan, > > > > > From: Manivannan Sadhasivam, Sent: Tuesday, October 10, 2023 9:04 PM > > > > > > On Fri, Sep 22, 2023 at 03:53:28PM +0900, Yoshihiro Shimoda wrote: > > > > Add R-Car Gen4 PCIe controller support for host mode. > > > > > > > > This controller is based on Synopsys DesignWare PCIe. However, this > > > > particular controller has a number of vendor-specific registers, and as > > > > such, requires initialization code like mode setting and retraining and > > > > so on. > > > > > > > > [kwilczynski: commit log] > > > > Link: > > <snip URL> > > > > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> > > > > Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> > > > > Reviewed-by: Serge Semin <fancer.lancer@gmail.com> > > > > --- > > > > drivers/pci/controller/dwc/Kconfig | 14 + > > > > drivers/pci/controller/dwc/Makefile | 1 + > > > > drivers/pci/controller/dwc/pcie-rcar-gen4.c | 380 ++++++++++++++++++++ > > > > 3 files changed, 395 insertions(+) > > > > create mode 100644 drivers/pci/controller/dwc/pcie-rcar-gen4.c > > > > > > > > diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig > > > > index ab96da43e0c2..bc69fcab2e2a 100644 > > > > --- a/drivers/pci/controller/dwc/Kconfig > > > > +++ b/drivers/pci/controller/dwc/Kconfig > > > > @@ -415,4 +415,18 @@ config PCIE_VISCONTI_HOST > > > > Say Y here if you want PCIe controller support on Toshiba Visconti SoC. > > > > This driver supports TMPV7708 SoC. > > > > > > > > +config PCIE_RCAR_GEN4 > > > > + tristate > > > > + > > > > +config PCIE_RCAR_GEN4_HOST > > > > + tristate "Renesas R-Car Gen4 PCIe controller (host mode)" > > > > + depends on ARCH_RENESAS || COMPILE_TEST > > > > + depends on PCI_MSI > > > > + select PCIE_DW_HOST > > > > + select PCIE_RCAR_GEN4 > > > > + help > > > > + Say Y here if you want PCIe controller (host mode) on R-Car Gen4 SoCs. > > > > + To compile this driver as a module, choose M here: the module will be > > > > + called pcie-rcar-gen4.ko. This uses the DesignWare core. > > > > + > > > > endmenu > > > > diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile > > > > index bf5c311875a1..bac103faa523 100644 > > > > --- a/drivers/pci/controller/dwc/Makefile > > > > +++ b/drivers/pci/controller/dwc/Makefile > > > > @@ -26,6 +26,7 @@ obj-$(CONFIG_PCIE_TEGRA194) += pcie-tegra194.o > > > > obj-$(CONFIG_PCIE_UNIPHIER) += pcie-uniphier.o > > > > obj-$(CONFIG_PCIE_UNIPHIER_EP) += pcie-uniphier-ep.o > > > > obj-$(CONFIG_PCIE_VISCONTI_HOST) += pcie-visconti.o > > > > +obj-$(CONFIG_PCIE_RCAR_GEN4) += pcie-rcar-gen4.o > > > > > > > > # The following drivers are for devices that use the generic ACPI > > > > # pci_root.c driver but don't support standard ECAM config access. > > > > diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c > > > > new file mode 100644 > > > > index 000000000000..dfff6bb18932 > > > > --- /dev/null > > > > +++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c > > [...] > > > > > +/* Host mode */ > > > > +static int rcar_gen4_pcie_host_init(struct dw_pcie_rp *pp) > > > > +{ > > > > + struct dw_pcie *dw = to_dw_pcie_from_pp(pp); > > > > + struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw); > > > > + int ret; > > > > + u32 val; > > > > + > > > > + gpiod_set_value_cansleep(dw->pe_rst, 1); > > > > + > > > > + ret = rcar_gen4_pcie_common_init(rcar); > > > > + if (ret) > > > > + return ret; > > > > + > > > > + /* > > > > + * According to the section 3.5.7.2 "RC Mode" in DWC PCIe Dual Mode > > > > + * Rev.5.20a, we should disable two BARs to avoid unnecessary memory > > > > + * assignment during device enumeration. > > > > + */ > > > > + dw_pcie_writel_dbi2(dw, PCI_BASE_ADDRESS_0, 0x0); > > > > + dw_pcie_writel_dbi2(dw, PCI_BASE_ADDRESS_1, 0x0); > > > > > > If this is DWC specific, can we move it to the common code? > > > > Hmm, it seems so. However, I didn't find any similar code on other DWC drivers. > > So, for now, moving it to the common code is not needed, I think. > > > > No. If this is as per the DWC spec, then it should be part of the common code. I got it. I'll add such a code by a separate patch. > > > > + > > > > + /* Enable MSI interrupt signal */ > > > > + val = readl(rcar->base + PCIEINTSTS0EN); > > > > + val |= MSI_CTRL_INT; > > > > + writel(val, rcar->base + PCIEINTSTS0EN); > > > > + > > > > > > Above should be guarded with: > > > > > > if (IS_ENABLED(CONFIG_PCI_MSI)) { > > > ... > > > } > > > > Since this driver depends on PCI_MSI by Kconfig, such a IS_ENABLED is not > > needed. This is from your suggestion ;) [2] > > > > [2] https://lore.kernel.org/linux-devicetree/20230724122820.GM6291@thinkpad/ > > heh... thanks for reminding me ;) You're welcome :) Thank you very much for your support! Best regards, Yoshihiro Shimoda > - Mani > > -- > மணிவண்ணன் சதாசிவம்
diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig index ab96da43e0c2..bc69fcab2e2a 100644 --- a/drivers/pci/controller/dwc/Kconfig +++ b/drivers/pci/controller/dwc/Kconfig @@ -415,4 +415,18 @@ config PCIE_VISCONTI_HOST Say Y here if you want PCIe controller support on Toshiba Visconti SoC. This driver supports TMPV7708 SoC. +config PCIE_RCAR_GEN4 + tristate + +config PCIE_RCAR_GEN4_HOST + tristate "Renesas R-Car Gen4 PCIe controller (host mode)" + depends on ARCH_RENESAS || COMPILE_TEST + depends on PCI_MSI + select PCIE_DW_HOST + select PCIE_RCAR_GEN4 + help + Say Y here if you want PCIe controller (host mode) on R-Car Gen4 SoCs. + To compile this driver as a module, choose M here: the module will be + called pcie-rcar-gen4.ko. This uses the DesignWare core. + endmenu diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile index bf5c311875a1..bac103faa523 100644 --- a/drivers/pci/controller/dwc/Makefile +++ b/drivers/pci/controller/dwc/Makefile @@ -26,6 +26,7 @@ obj-$(CONFIG_PCIE_TEGRA194) += pcie-tegra194.o obj-$(CONFIG_PCIE_UNIPHIER) += pcie-uniphier.o obj-$(CONFIG_PCIE_UNIPHIER_EP) += pcie-uniphier-ep.o obj-$(CONFIG_PCIE_VISCONTI_HOST) += pcie-visconti.o +obj-$(CONFIG_PCIE_RCAR_GEN4) += pcie-rcar-gen4.o # The following drivers are for devices that use the generic ACPI # pci_root.c driver but don't support standard ECAM config access. diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c new file mode 100644 index 000000000000..dfff6bb18932 --- /dev/null +++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c @@ -0,0 +1,380 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * PCIe controller driver for Renesas R-Car Gen4 Series SoCs + * Copyright (C) 2022-2023 Renesas Electronics Corporation + */ + +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/pci.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/reset.h> + +#include "../../pci.h" +#include "pcie-designware.h" + +/* Renesas-specific */ +/* PCIe Mode Setting Register 0 */ +#define PCIEMSR0 0x0000 +#define BIFUR_MOD_SET_ON BIT(0) +#define DEVICE_TYPE_EP 0 +#define DEVICE_TYPE_RC BIT(4) + +/* PCIe Interrupt Status 0 */ +#define PCIEINTSTS0 0x0084 + +/* PCIe Interrupt Status 0 Enable */ +#define PCIEINTSTS0EN 0x0310 +#define MSI_CTRL_INT BIT(26) +#define SMLH_LINK_UP BIT(7) +#define RDLH_LINK_UP BIT(6) + +/* PCIe DMA Interrupt Status Enable */ +#define PCIEDMAINTSTSEN 0x0314 +#define PCIEDMAINTSTSEN_INIT GENMASK(15, 0) + +/* PCIe Reset Control Register 1 */ +#define PCIERSTCTRL1 0x0014 +#define APP_HOLD_PHY_RST BIT(16) +#define APP_LTSSM_ENABLE BIT(0) + +#define RCAR_NUM_SPEED_CHANGE_RETRIES 10 +#define RCAR_MAX_LINK_SPEED 4 + +struct rcar_gen4_pcie { + struct dw_pcie dw; + void __iomem *base; + struct platform_device *pdev; + enum dw_pcie_device_mode mode; +}; +#define to_rcar_gen4_pcie(_dw) container_of(_dw, struct rcar_gen4_pcie, dw) + +static void rcar_gen4_pcie_ltssm_enable(struct rcar_gen4_pcie *rcar, + bool enable) +{ + u32 val; + + val = readl(rcar->base + PCIERSTCTRL1); + if (enable) { + val |= APP_LTSSM_ENABLE; + val &= ~APP_HOLD_PHY_RST; + } else { + /* + * Since the datasheet of R-Car doesn't mention how to assert + * the APP_HOLD_PHY_RST, don't assert it again. Otherwise, + * hang-up issue happened in the dw_edma_core_off() when + * the controller didn't detect a PCI device. + */ + val &= ~APP_LTSSM_ENABLE; + } + writel(val, rcar->base + PCIERSTCTRL1); +} + +static int rcar_gen4_pcie_link_up(struct dw_pcie *dw) +{ + struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw); + u32 val, mask; + + val = readl(rcar->base + PCIEINTSTS0); + mask = RDLH_LINK_UP | SMLH_LINK_UP; + + return (val & mask) == mask; +} + +/* + * Manually initiate the speed change. Return true if the change succeeded, + * false if the change didn't finish within certain periods. + */ +static int rcar_gen4_pcie_speed_change(struct dw_pcie *dw) +{ + u32 val; + int i; + + val = dw_pcie_readl_dbi(dw, PCIE_LINK_WIDTH_SPEED_CONTROL); + val &= ~PORT_LOGIC_SPEED_CHANGE; + dw_pcie_writel_dbi(dw, PCIE_LINK_WIDTH_SPEED_CONTROL, val); + + val = dw_pcie_readl_dbi(dw, PCIE_LINK_WIDTH_SPEED_CONTROL); + val |= PORT_LOGIC_SPEED_CHANGE; + dw_pcie_writel_dbi(dw, PCIE_LINK_WIDTH_SPEED_CONTROL, val); + + for (i = 0; i < RCAR_NUM_SPEED_CHANGE_RETRIES; i++) { + val = dw_pcie_readl_dbi(dw, PCIE_LINK_WIDTH_SPEED_CONTROL); + if (!(val & PORT_LOGIC_SPEED_CHANGE)) + return 0; + usleep_range(10000, 11000); + } + + return -ETIMEDOUT; +} + +/* + * Enable LTSSM of this controller and manually initiate the speed change. + * Always return 0. + */ +static int rcar_gen4_pcie_start_link(struct dw_pcie *dw) +{ + struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw); + int i, changes; + + rcar_gen4_pcie_ltssm_enable(rcar, true); + + /* + * Require direct speed change with retrying here if the link_gen is + * PCIe Gen2 or higher. + */ + changes = min_not_zero(dw->link_gen, RCAR_MAX_LINK_SPEED) - 1; + + /* + * Since dw_pcie_setup_rc() sets it once, PCIe Gen2 will be trained. + * So, this needs remaining times for up to PCIe Gen4 if RC mode. + */ + if (changes && rcar->mode == DW_PCIE_RC_TYPE) + changes--; + + for (i = 0; i < changes; i++) { + /* No error because possible disconnected here if EP mode */ + if (rcar_gen4_pcie_speed_change(dw)) + break; + } + + return 0; +} + +static void rcar_gen4_pcie_stop_link(struct dw_pcie *dw) +{ + struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw); + + rcar_gen4_pcie_ltssm_enable(rcar, false); +} + +int rcar_gen4_pcie_common_init(struct rcar_gen4_pcie *rcar) +{ + struct dw_pcie *dw = &rcar->dw; + u32 val; + int ret; + + ret = clk_bulk_prepare_enable(DW_PCIE_NUM_CORE_CLKS, dw->core_clks); + if (ret) { + dev_err(dw->dev, "Failed to enable ref clocks\n"); + return ret; + } + + if (!reset_control_status(dw->core_rsts[DW_PCIE_PWR_RST].rstc)) + reset_control_assert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); + + val = readl(rcar->base + PCIEMSR0); + if (rcar->mode == DW_PCIE_RC_TYPE) { + val |= DEVICE_TYPE_RC; + } else if (rcar->mode == DW_PCIE_EP_TYPE) { + val |= DEVICE_TYPE_EP; + } else { + ret = -EINVAL; + goto err_unprepare; + } + + if (dw->num_lanes < 4) + val |= BIFUR_MOD_SET_ON; + + writel(val, rcar->base + PCIEMSR0); + + ret = reset_control_deassert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); + if (ret) + goto err_unprepare; + + return 0; + +err_unprepare: + clk_bulk_disable_unprepare(DW_PCIE_NUM_CORE_CLKS, dw->core_clks); + + return ret; +} + +void rcar_gen4_pcie_common_deinit(struct rcar_gen4_pcie *rcar) +{ + struct dw_pcie *dw = &rcar->dw; + + reset_control_assert(dw->core_rsts[DW_PCIE_PWR_RST].rstc); + clk_bulk_disable_unprepare(DW_PCIE_NUM_CORE_CLKS, dw->core_clks); +} + +int rcar_gen4_pcie_prepare(struct rcar_gen4_pcie *rcar) +{ + struct device *dev = rcar->dw.dev; + int err; + + pm_runtime_enable(dev); + err = pm_runtime_resume_and_get(dev); + if (err < 0) { + dev_err(dev, "Failed to resume/get Runtime PM\n"); + pm_runtime_disable(dev); + } + + return err; +} + +void rcar_gen4_pcie_unprepare(struct rcar_gen4_pcie *rcar) +{ + struct device *dev = rcar->dw.dev; + + pm_runtime_put(dev); + pm_runtime_disable(dev); +} + +int rcar_gen4_pcie_get_resources(struct rcar_gen4_pcie *rcar) +{ + /* Renesas-specific registers */ + rcar->base = devm_platform_ioremap_resource_byname(rcar->pdev, "app"); + + return PTR_ERR_OR_ZERO(rcar->base); +} + +static const struct dw_pcie_ops dw_pcie_ops = { + .start_link = rcar_gen4_pcie_start_link, + .stop_link = rcar_gen4_pcie_stop_link, + .link_up = rcar_gen4_pcie_link_up, +}; + +struct rcar_gen4_pcie *rcar_gen4_pcie_devm_alloc(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rcar_gen4_pcie *rcar; + + rcar = devm_kzalloc(dev, sizeof(*rcar), GFP_KERNEL); + if (!rcar) + return ERR_PTR(-ENOMEM); + + rcar->dw.ops = &dw_pcie_ops; + rcar->dw.dev = dev; + rcar->pdev = pdev; + dw_pcie_cap_set(&rcar->dw, EDMA_UNROLL); + dw_pcie_cap_set(&rcar->dw, REQ_RES); + platform_set_drvdata(pdev, rcar); + + return rcar; +} + +/* Host mode */ +static int rcar_gen4_pcie_host_init(struct dw_pcie_rp *pp) +{ + struct dw_pcie *dw = to_dw_pcie_from_pp(pp); + struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw); + int ret; + u32 val; + + gpiod_set_value_cansleep(dw->pe_rst, 1); + + ret = rcar_gen4_pcie_common_init(rcar); + if (ret) + return ret; + + /* + * According to the section 3.5.7.2 "RC Mode" in DWC PCIe Dual Mode + * Rev.5.20a, we should disable two BARs to avoid unnecessary memory + * assignment during device enumeration. + */ + dw_pcie_writel_dbi2(dw, PCI_BASE_ADDRESS_0, 0x0); + dw_pcie_writel_dbi2(dw, PCI_BASE_ADDRESS_1, 0x0); + + /* Enable MSI interrupt signal */ + val = readl(rcar->base + PCIEINTSTS0EN); + val |= MSI_CTRL_INT; + writel(val, rcar->base + PCIEINTSTS0EN); + + msleep(PCIE_T_PVPERL_MS); /* pe_rst requires 100msec delay */ + + gpiod_set_value_cansleep(dw->pe_rst, 0); + + return 0; +} + +static void rcar_gen4_pcie_host_deinit(struct dw_pcie_rp *pp) +{ + struct dw_pcie *dw = to_dw_pcie_from_pp(pp); + struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw); + + gpiod_set_value_cansleep(dw->pe_rst, 1); + rcar_gen4_pcie_common_deinit(rcar); +} + +static const struct dw_pcie_host_ops rcar_gen4_pcie_host_ops = { + .host_init = rcar_gen4_pcie_host_init, + .host_deinit = rcar_gen4_pcie_host_deinit, +}; + +static int rcar_gen4_add_dw_pcie_rp(struct rcar_gen4_pcie *rcar) +{ + struct dw_pcie_rp *pp = &rcar->dw.pp; + + pp->num_vectors = MAX_MSI_IRQS; + pp->ops = &rcar_gen4_pcie_host_ops; + rcar->mode = DW_PCIE_RC_TYPE; + + return dw_pcie_host_init(pp); +} + +static void rcar_gen4_remove_dw_pcie_rp(struct rcar_gen4_pcie *rcar) +{ + dw_pcie_host_deinit(&rcar->dw.pp); +} + +static int rcar_gen4_pcie_probe(struct platform_device *pdev) +{ + struct rcar_gen4_pcie *rcar; + int err; + + rcar = rcar_gen4_pcie_devm_alloc(pdev); + if (IS_ERR(rcar)) + return PTR_ERR(rcar); + + err = rcar_gen4_pcie_get_resources(rcar); + if (err) + return err; + + err = rcar_gen4_pcie_prepare(rcar); + if (err) + return err; + + err = rcar_gen4_add_dw_pcie_rp(rcar); + if (err) + goto err_unprepare; + + return 0; + +err_unprepare: + rcar_gen4_pcie_unprepare(rcar); + + return err; +} + +static void rcar_gen4_pcie_remove(struct platform_device *pdev) +{ + struct rcar_gen4_pcie *rcar = platform_get_drvdata(pdev); + + rcar_gen4_remove_dw_pcie_rp(rcar); + rcar_gen4_pcie_unprepare(rcar); +} + +static const struct of_device_id rcar_gen4_pcie_of_match[] = { + { .compatible = "renesas,rcar-gen4-pcie", }, + {}, +}; +MODULE_DEVICE_TABLE(of, rcar_gen4_pcie_of_match); + +static struct platform_driver rcar_gen4_pcie_driver = { + .driver = { + .name = "pcie-rcar-gen4", + .of_match_table = rcar_gen4_pcie_of_match, + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + }, + .probe = rcar_gen4_pcie_probe, + .remove_new = rcar_gen4_pcie_remove, +}; +module_platform_driver(rcar_gen4_pcie_driver); + +MODULE_DESCRIPTION("Renesas R-Car Gen4 PCIe controller driver"); +MODULE_LICENSE("GPL");