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PCI: rcar-gen4: Add endpoint mode support
Add R-Car Gen4 PCIe controller for endpoint mode. This controller is based on Synopsys DesignWare PCIe. Link: https://lore.kernel.org/linux-pci/20231018085631.1121289-14-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: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
This commit is contained in:
Yoshihiro Shimoda
Krzysztof Wilczyński
parent
0d0c551011
commit
e311b3834d
2 changed files with 164 additions and 4 deletions
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@ -300,6 +300,17 @@ config PCIE_RCAR_GEN4_HOST
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To compile this driver as a module, choose M here: the module will be
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called pcie-rcar-gen4.ko. This uses the DesignWare core.
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config PCIE_RCAR_GEN4_EP
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tristate "Renesas R-Car Gen4 PCIe controller (endpoint mode)"
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depends on ARCH_RENESAS || COMPILE_TEST
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depends on PCI_ENDPOINT
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select PCIE_DW_EP
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select PCIE_RCAR_GEN4
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help
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Say Y here if you want PCIe controller (endpoint mode) on R-Car Gen4
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SoCs. To compile this driver as a module, choose M here: the module
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will be called pcie-rcar-gen4.ko. This uses the DesignWare core.
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config PCIE_ROCKCHIP_DW_HOST
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bool "Rockchip DesignWare PCIe controller"
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select PCIE_DW
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@ -21,6 +21,7 @@
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/* PCIe Mode Setting Register 0 */
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#define PCIEMSR0 0x0000
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#define BIFUR_MOD_SET_ON BIT(0)
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#define DEVICE_TYPE_EP 0
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#define DEVICE_TYPE_RC BIT(4)
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/* PCIe Interrupt Status 0 */
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@ -44,6 +45,9 @@
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#define RCAR_NUM_SPEED_CHANGE_RETRIES 10
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#define RCAR_MAX_LINK_SPEED 4
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#define RCAR_GEN4_PCIE_EP_FUNC_DBI_OFFSET 0x1000
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#define RCAR_GEN4_PCIE_EP_FUNC_DBI2_OFFSET 0x800
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struct rcar_gen4_pcie {
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struct dw_pcie dw;
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void __iomem *base;
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@ -52,6 +56,7 @@ struct rcar_gen4_pcie {
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};
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#define to_rcar_gen4_pcie(_dw) container_of(_dw, struct rcar_gen4_pcie, dw)
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/* Common */
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static void rcar_gen4_pcie_ltssm_enable(struct rcar_gen4_pcie *rcar,
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bool enable)
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{
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@ -169,6 +174,8 @@ static int rcar_gen4_pcie_common_init(struct rcar_gen4_pcie *rcar)
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val = readl(rcar->base + PCIEMSR0);
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if (rcar->mode == DW_PCIE_RC_TYPE) {
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val |= DEVICE_TYPE_RC;
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} else if (rcar->mode == DW_PCIE_EP_TYPE) {
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val |= DEVICE_TYPE_EP;
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} else {
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ret = -EINVAL;
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goto err_unprepare;
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@ -308,9 +315,11 @@ static int rcar_gen4_add_dw_pcie_rp(struct rcar_gen4_pcie *rcar)
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{
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struct dw_pcie_rp *pp = &rcar->dw.pp;
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if (!IS_ENABLED(CONFIG_PCIE_RCAR_GEN4_HOST))
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return -ENODEV;
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pp->num_vectors = MAX_MSI_IRQS;
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pp->ops = &rcar_gen4_pcie_host_ops;
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rcar->mode = DW_PCIE_RC_TYPE;
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return dw_pcie_host_init(pp);
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}
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@ -320,6 +329,125 @@ static void rcar_gen4_remove_dw_pcie_rp(struct rcar_gen4_pcie *rcar)
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dw_pcie_host_deinit(&rcar->dw.pp);
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}
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/* Endpoint mode */
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static void rcar_gen4_pcie_ep_pre_init(struct dw_pcie_ep *ep)
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{
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struct dw_pcie *dw = to_dw_pcie_from_ep(ep);
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struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw);
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int ret;
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ret = rcar_gen4_pcie_common_init(rcar);
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if (ret)
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return;
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writel(PCIEDMAINTSTSEN_INIT, rcar->base + PCIEDMAINTSTSEN);
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}
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static void rcar_gen4_pcie_ep_init(struct dw_pcie_ep *ep)
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{
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struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
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enum pci_barno bar;
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for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
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dw_pcie_ep_reset_bar(pci, bar);
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}
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static void rcar_gen4_pcie_ep_deinit(struct dw_pcie_ep *ep)
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{
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struct dw_pcie *dw = to_dw_pcie_from_ep(ep);
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struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw);
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writel(0, rcar->base + PCIEDMAINTSTSEN);
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rcar_gen4_pcie_common_deinit(rcar);
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}
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static int rcar_gen4_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
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enum pci_epc_irq_type type,
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u16 interrupt_num)
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{
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struct dw_pcie *dw = to_dw_pcie_from_ep(ep);
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switch (type) {
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case PCI_EPC_IRQ_LEGACY:
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return dw_pcie_ep_raise_legacy_irq(ep, func_no);
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case PCI_EPC_IRQ_MSI:
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return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
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default:
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dev_err(dw->dev, "Unknown IRQ type\n");
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return -EINVAL;
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}
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return 0;
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}
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static const struct pci_epc_features rcar_gen4_pcie_epc_features = {
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.linkup_notifier = false,
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.msi_capable = true,
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.msix_capable = false,
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.reserved_bar = 1 << BAR_1 | 1 << BAR_3 | 1 << BAR_5,
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.align = SZ_1M,
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};
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static const struct pci_epc_features*
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rcar_gen4_pcie_ep_get_features(struct dw_pcie_ep *ep)
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{
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return &rcar_gen4_pcie_epc_features;
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}
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static unsigned int rcar_gen4_pcie_ep_func_conf_select(struct dw_pcie_ep *ep,
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u8 func_no)
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{
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return func_no * RCAR_GEN4_PCIE_EP_FUNC_DBI_OFFSET;
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}
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static unsigned int rcar_gen4_pcie_ep_get_dbi2_offset(struct dw_pcie_ep *ep,
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u8 func_no)
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{
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return func_no * RCAR_GEN4_PCIE_EP_FUNC_DBI2_OFFSET;
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}
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static const struct dw_pcie_ep_ops pcie_ep_ops = {
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.pre_init = rcar_gen4_pcie_ep_pre_init,
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.ep_init = rcar_gen4_pcie_ep_init,
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.deinit = rcar_gen4_pcie_ep_deinit,
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.raise_irq = rcar_gen4_pcie_ep_raise_irq,
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.get_features = rcar_gen4_pcie_ep_get_features,
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.func_conf_select = rcar_gen4_pcie_ep_func_conf_select,
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.get_dbi2_offset = rcar_gen4_pcie_ep_get_dbi2_offset,
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};
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static int rcar_gen4_add_dw_pcie_ep(struct rcar_gen4_pcie *rcar)
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{
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struct dw_pcie_ep *ep = &rcar->dw.ep;
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if (!IS_ENABLED(CONFIG_PCIE_RCAR_GEN4_EP))
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return -ENODEV;
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ep->ops = &pcie_ep_ops;
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return dw_pcie_ep_init(ep);
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}
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static void rcar_gen4_remove_dw_pcie_ep(struct rcar_gen4_pcie *rcar)
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{
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dw_pcie_ep_exit(&rcar->dw.ep);
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}
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/* Common */
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static int rcar_gen4_add_dw_pcie(struct rcar_gen4_pcie *rcar)
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{
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rcar->mode = (enum dw_pcie_device_mode)of_device_get_match_data(&rcar->pdev->dev);
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switch (rcar->mode) {
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case DW_PCIE_RC_TYPE:
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return rcar_gen4_add_dw_pcie_rp(rcar);
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case DW_PCIE_EP_TYPE:
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return rcar_gen4_add_dw_pcie_ep(rcar);
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default:
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return -EINVAL;
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}
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}
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static int rcar_gen4_pcie_probe(struct platform_device *pdev)
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{
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struct rcar_gen4_pcie *rcar;
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@ -337,7 +465,7 @@ static int rcar_gen4_pcie_probe(struct platform_device *pdev)
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if (err)
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return err;
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err = rcar_gen4_add_dw_pcie_rp(rcar);
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err = rcar_gen4_add_dw_pcie(rcar);
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if (err)
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goto err_unprepare;
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@ -349,16 +477,37 @@ static int rcar_gen4_pcie_probe(struct platform_device *pdev)
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return err;
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}
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static void rcar_gen4_remove_dw_pcie(struct rcar_gen4_pcie *rcar)
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{
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switch (rcar->mode) {
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case DW_PCIE_RC_TYPE:
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rcar_gen4_remove_dw_pcie_rp(rcar);
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break;
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case DW_PCIE_EP_TYPE:
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rcar_gen4_remove_dw_pcie_ep(rcar);
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break;
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default:
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break;
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}
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}
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static void rcar_gen4_pcie_remove(struct platform_device *pdev)
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{
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struct rcar_gen4_pcie *rcar = platform_get_drvdata(pdev);
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rcar_gen4_remove_dw_pcie_rp(rcar);
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rcar_gen4_remove_dw_pcie(rcar);
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rcar_gen4_pcie_unprepare(rcar);
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}
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static const struct of_device_id rcar_gen4_pcie_of_match[] = {
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{ .compatible = "renesas,rcar-gen4-pcie", },
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{
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.compatible = "renesas,rcar-gen4-pcie",
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.data = (void *)DW_PCIE_RC_TYPE,
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},
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{
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.compatible = "renesas,rcar-gen4-pcie-ep",
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.data = (void *)DW_PCIE_EP_TYPE,
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, rcar_gen4_pcie_of_match);
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