[PATCH 5/5] PCI: cadence: add EndPoint Controller driver for Cadence PCIe controller

Cyrille Pitchen
2017-11-23T15:21:04Z

This patch adds support to the Cadence PCIe controller in endpoint mode.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@free-electrons.com>
---
drivers/pci/cadence/Kconfig | 9 +
drivers/pci/cadence/Makefile | 1 +
drivers/pci/cadence/pcie-cadence-ep.c | 553 ++++++++++++++++++++++++++++++++++
3 files changed, 563 insertions(+)
create mode 100644 drivers/pci/cadence/pcie-cadence-ep.c

diff --git a/drivers/pci/cadence/Kconfig b/drivers/pci/cadence/Kconfig
index 120306cae2aa..b2e6af71f39e 100644
--- a/drivers/pci/cadence/Kconfig
+++ b/drivers/pci/cadence/Kconfig
@@ -21,4 +21,13 @@ config PCIE_CADENCE_HOST
mode. This PCIe controller may be embedded into many different vendors
SoCs.

+config PCIE_CADENCE_EP
+ bool "Cadence PCIe endpoint controller"
+ depends on PCI_ENDPOINT
+ select PCIE_CADENCE
+ help
+ Say Y here if you want to support the Cadence PCIe controller in
+ endpoint mode. This PCIe controller may be embedded into many
+ different vendors SoCs.
+
endif # PCI_CADENCE
diff --git a/drivers/pci/cadence/Makefile b/drivers/pci/cadence/Makefile
index d57d192d2595..61e9c8d6839d 100644
--- a/drivers/pci/cadence/Makefile
+++ b/drivers/pci/cadence/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_PCIE_CADENCE) += pcie-cadence.o
obj-$(CONFIG_PCIE_CADENCE_HOST) += pcie-cadence-host.o
+obj-$(CONFIG_PCIE_CADENCE_EP) += pcie-cadence-ep.o
diff --git a/drivers/pci/cadence/pcie-cadence-ep.c b/drivers/pci/cadence/pcie-cadence-ep.c
new file mode 100644
index 000000000000..a1d761101a9c
--- /dev/null
+++ b/drivers/pci/cadence/pcie-cadence-ep.c
@@ -0,0 +1,553 @@
+/*
+ * Cadence PCIe host controller driver.
+ *
+ * Copyright (c) 2017 Cadence
+ *
+ * Author: Cyrille Pitchen <cyrille.pitchen@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/pci-epc.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/sizes.h>
+#include <linux/delay.h>
+
+#include "pcie-cadence.h"
+
+#define CDNS_PCIE_EP_MIN_APERTURE 128 /* 128 bytes */
+#define CDNS_PCIE_EP_IRQ_PCI_ADDR_NONE 0x1
+#define CDNS_PCIE_EP_IRQ_PCI_ADDR_LEGACY 0x3
+
+/**
+ * struct cdns_pcie_ep_data - hardware specific data
+ * @max_regions: maximum nmuber of regions supported by hardware
+ */
+struct cdns_pcie_ep_data {
+ size_t max_regions;
+};
+
+/**
+ * struct cdns_pcie_ep - private data for this PCIe endpoint controller driver
+ * @pcie: Cadence PCIe controller
+ * @data: pointer to a 'struct cdns_pcie_data'
+ */
+struct cdns_pcie_ep {
+ struct cdns_pcie pcie;
+ const struct cdns_pcie_ep_data *data;
+ struct pci_epc *epc;
+ unsigned long ob_region_map;
+ phys_addr_t *ob_addr;
+ phys_addr_t irq_phys_addr;
+ void __iomem *irq_cpu_addr;
+ u64 irq_pci_addr;
+ u8 irq_pending;
+};
+
+static int cdns_pcie_ep_write_header(struct pci_epc *epc,
+ struct pci_epf_header *hdr)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u8 fn = 0;
+
+ if (fn == 0) {
+ u32 id = CDNS_PCIE_LM_ID_VENDOR(hdr->vendorid) |
+ CDNS_PCIE_LM_ID_SUBSYS(hdr->subsys_vendor_id);
+ cdns_pcie_writel(pcie, CDNS_PCIE_LM_ID, id);
+ }
+ cdns_pcie_ep_fn_writew(pcie, fn, PCI_DEVICE_ID, hdr->deviceid);
+ cdns_pcie_ep_fn_writeb(pcie, fn, PCI_REVISION_ID, hdr->revid);
+ cdns_pcie_ep_fn_writeb(pcie, fn, PCI_CLASS_PROG, hdr->progif_code);
+ cdns_pcie_ep_fn_writew(pcie, fn, PCI_CLASS_DEVICE,
+ hdr->subclass_code | hdr->baseclass_code << 8);
+ cdns_pcie_ep_fn_writeb(pcie, fn, PCI_CACHE_LINE_SIZE,
+ hdr->cache_line_size);
+ cdns_pcie_ep_fn_writew(pcie, fn, PCI_SUBSYSTEM_ID, hdr->subsys_id);
+ cdns_pcie_ep_fn_writeb(pcie, fn, PCI_INTERRUPT_PIN, hdr->interrupt_pin);
+
+ return 0;
+}
+
+static int cdns_pcie_ep_set_bar(struct pci_epc *epc, enum pci_barno bar,
+ dma_addr_t bar_phys, size_t size, int flags)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 addr0, addr1, reg, cfg, b, aperture, ctrl;
+ u8 fn = 0;
+ u64 sz;
+
+ /* BAR size is 2^(aperture + 7) */
+ sz = max_t(size_t, size, CDNS_PCIE_EP_MIN_APERTURE);
+ sz = 1ULL << fls64(sz - 1);
+ aperture = ilog2(sz) - 7; /* 128B -> 0, 256B -> 1, 512B -> 2, ... */
+
+ if ((flags & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
+ ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_IO_32BITS;
+ } else {
+ bool is_prefetch = !!(flags & PCI_BASE_ADDRESS_MEM_PREFETCH);
+ bool is_64bits = sz > SZ_2G;
+
+ if (is_64bits && (bar & 1))
+ return -EINVAL;
+
+ switch (is_64bits << 1 | is_prefetch) {
+ case 0:
+ ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_MEM_32BITS;
+ break;
+
+ case 1:
+ ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_PREFETCH_MEM_32BITS;
+ break;
+
+ case 2:
+ ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_MEM_64BITS;
+ break;
+
+ case 3:
+ ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_PREFETCH_MEM_64BITS;
+ break;
+ }
+ }
+
+ addr0 = lower_32_bits(bar_phys);
+ addr1 = upper_32_bits(bar_phys);
+ cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR0(fn, bar),
+ addr0);
+ cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR1(fn, bar),
+ addr1);
+
+ if (bar < BAR_4) {
+ reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG0(fn);
+ b = bar;
+ } else {
+ reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG1(fn);
+ b = bar - BAR_4;
+ }
+
+ cfg = cdns_pcie_readl(pcie, reg);
+ cfg &= ~(CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE_MASK(b) |
+ CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b));
+ cfg |= (CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE(b, aperture) |
+ CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL(b, ctrl));
+ cdns_pcie_writel(pcie, reg, cfg);
+
+ return 0;
+}
+
+static void cdns_pcie_ep_clear_bar(struct pci_epc *epc, enum pci_barno bar)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 reg, cfg, b, ctrl;
+ u8 fn = 0;
+
+ if (bar < BAR_4) {
+ reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG0(fn);
+ b = bar;
+ } else {
+ reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG1(fn);
+ b = bar - BAR_4;
+ }
+
+ ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_DISABLED;
+ cfg = cdns_pcie_readl(pcie, reg);
+ cfg &= ~(CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE_MASK(b) |
+ CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b));
+ cfg |= CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(ctrl);
+ cdns_pcie_writel(pcie, reg, cfg);
+
+ cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR0(fn, bar), 0);
+ cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR1(fn, bar), 0);
+}
+
+static int cdns_pcie_ep_map_addr(struct pci_epc *epc, phys_addr_t addr,
+ u64 pci_addr, size_t size)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 r;
+
+ r = find_first_zero_bit(&ep->ob_region_map, sizeof(ep->ob_region_map));
+ if (r >= ep->data->max_regions - 1) {
+ dev_err(&epc->dev, "no free outbound region\n");
+ return -EINVAL;
+ }
+
+ cdns_pcie_set_outbound_region(pcie, r, false, addr, pci_addr, size);
+
+ set_bit(r, &ep->ob_region_map);
+ ep->ob_addr[r] = addr;
+
+ return 0;
+}
+
+static void cdns_pcie_ep_unmap_addr(struct pci_epc *epc, phys_addr_t addr)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 r;
+
+ for (r = 0; r < ep->data->max_regions - 1; r++)
+ if (ep->ob_addr[r] == addr)
+ break;
+
+ if (r >= ep->data->max_regions - 1)
+ return;
+
+ cdns_pcie_reset_outbound_region(pcie, r);
+
+ ep->ob_addr[r] = 0;
+ clear_bit(r, &ep->ob_region_map);
+}
+
+static int cdns_pcie_ep_set_msi(struct pci_epc *epc, u8 mmc)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
+ u16 flags;
+ u8 fn = 0;
+
+ /* Validate the ID of the MSI Capability structure. */
+ if (cdns_pcie_ep_fn_readb(pcie, fn, cap) != PCI_CAP_ID_MSI)
+ return -EINVAL;
+
+ /*
+ * Set the Multiple Message Capable bitfield into the Message Control
+ * register.
+ */
+ flags = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_MSI_FLAGS);
+ flags = (flags & ~PCI_MSI_FLAGS_QMASK) | (mmc << 1);
+ flags |= PCI_MSI_FLAGS_64BIT;
+ flags &= ~PCI_MSI_FLAGS_MASKBIT;
+ cdns_pcie_ep_fn_writew(pcie, fn, cap + PCI_MSI_FLAGS, flags);
+
+ return 0;
+}
+
+static int cdns_pcie_ep_get_msi(struct pci_epc *epc)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
+ u16 flags, mmc, mme;
+ u8 fn = 0;
+
+ /* Validate the ID of the MSI Capability structure. */
+ if (cdns_pcie_ep_fn_readb(pcie, fn, cap) != PCI_CAP_ID_MSI)
+ return -EINVAL;
+
+ /* Validate that the MSI feature is actually enabled. */
+ flags = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_MSI_FLAGS);
+ if (!(flags & PCI_MSI_FLAGS_ENABLE))
+ return -EINVAL;
+
+ /*
+ * Get the Multiple Message Enable bitfield from the Message Control
+ * register.
+ */
+ mmc = (flags & PCI_MSI_FLAGS_QMASK) >> 1;
+ mme = (flags & PCI_MSI_FLAGS_QSIZE) >> 4;
+ if (mme > mmc)
+ mme = mmc;
+ if (mme > 5)
+ mme = 5;
+
+ return mme;
+}
+
+static void cdns_pcie_ep_assert_intx(struct cdns_pcie_ep *ep, u8 fn,
+ u8 intx, bool is_asserted)
+{
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 r = ep->data->max_regions - 1;
+ u32 offset;
+ u16 status;
+ u8 msg_code;
+
+ intx &= 3;
+
+ /* Set the outbound region if needed. */
+ if (unlikely(ep->irq_pci_addr != CDNS_PCIE_EP_IRQ_PCI_ADDR_LEGACY)) {
+ /* Last region was reserved for IRQ writes. */
+ cdns_pcie_set_outbound_region_for_normal_msg(pcie, r,
+ ep->irq_phys_addr);
+ ep->irq_pci_addr = CDNS_PCIE_EP_IRQ_PCI_ADDR_LEGACY;
+ }
+
+ if (is_asserted) {
+ ep->irq_pending |= BIT(intx);
+ msg_code = MSG_CODE_ASSERT_INTA + intx;
+ } else {
+ ep->irq_pending &= ~BIT(intx);
+ msg_code = MSG_CODE_DEASSERT_INTA + intx;
+ }
+
+ status = cdns_pcie_ep_fn_readw(pcie, fn, PCI_STATUS);
+ if (((status & PCI_STATUS_INTERRUPT) != 0) ^ (ep->irq_pending != 0)) {
+ status ^= PCI_STATUS_INTERRUPT;
+ cdns_pcie_ep_fn_writew(pcie, fn, PCI_STATUS, status);
+ }
+
+ offset = CDNS_PCIE_NORMAL_MSG_ROUTING(MSG_ROUTING_LOCAL) |
+ CDNS_PCIE_NORMAL_MSG_CODE(msg_code) |
+ CDNS_PCIE_MSG_NO_DATA;
+ writel(0, ep->irq_cpu_addr + offset);
+}
+
+static int cdns_pcie_ep_send_legacy_irq(struct cdns_pcie_ep *ep, u8 fn, u8 intx)
+{
+ u16 cmd;
+
+ cmd = cdns_pcie_ep_fn_readw(&ep->pcie, fn, PCI_COMMAND);
+ if (cmd & PCI_COMMAND_INTX_DISABLE)
+ return -EINVAL;
+
+ cdns_pcie_ep_assert_intx(ep, fn, intx, true);
+ mdelay(1);
+ cdns_pcie_ep_assert_intx(ep, fn, intx, false);
+ return 0;
+}
+
+static int cdns_pcie_ep_raise_irq(struct pci_epc *epc,
+ enum pci_epc_irq_type type, u8 interrupt_num)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
+ u16 flags, mmc, mme, data, data_mask;
+ u8 msi_count;
+ u64 pci_addr, pci_addr_mask = 0xff;
+ u8 fn = 0;
+
+ /* Handle legacy IRQ. */
+ if (type == PCI_EPC_IRQ_LEGACY)
+ return cdns_pcie_ep_send_legacy_irq(ep, fn, 0);
+
+ /* Otherwise MSI. */
+ if (type != PCI_EPC_IRQ_MSI)
+ return -EINVAL;
+
+ /* Check whether the MSI feature has been enabled by the PCI host. */
+ flags = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_MSI_FLAGS);
+ if (!(flags & PCI_MSI_FLAGS_ENABLE))
+ return -EINVAL;
+
+ /* Get the number of enabled MSIs */
+ mmc = (flags & PCI_MSI_FLAGS_QMASK) >> 1;
+ mme = (flags & PCI_MSI_FLAGS_QSIZE) >> 4;
+ if (mme > mmc)
+ mme = mmc;
+ if (mme > 5)
+ mme = 5;
+
+ msi_count = 1 << mme;
+ if (!interrupt_num || interrupt_num > msi_count)
+ return -EINVAL;
+
+ /* Compute the data value to be written. */
+ data_mask = msi_count - 1;
+ data = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_MSI_DATA_64);
+ data = (data & ~data_mask) | ((interrupt_num - 1) & data_mask);
+
+ /* Get the PCI address where to write the data into. */
+ pci_addr = cdns_pcie_ep_fn_readl(pcie, fn, cap + PCI_MSI_ADDRESS_HI);
+ pci_addr <<= 32;
+ pci_addr |= cdns_pcie_ep_fn_readl(pcie, fn, cap + PCI_MSI_ADDRESS_LO);
+ pci_addr &= GENMASK_ULL(63, 2);
+
+ /* Set the outbound region if needed. */
+ if (unlikely(ep->irq_pci_addr != pci_addr)) {
+ /* Last region was reserved for IRQ writes. */
+ cdns_pcie_set_outbound_region(pcie, ep->data->max_regions - 1,
+ false,
+ ep->irq_phys_addr,
+ pci_addr & ~pci_addr_mask,
+ pci_addr_mask + 1);
+ ep->irq_pci_addr = pci_addr;
+ }
+ writew(data, ep->irq_cpu_addr + (pci_addr & pci_addr_mask));
+
+ return 0;
+}
+
+static int cdns_pcie_ep_start(struct pci_epc *epc)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ struct pci_epf *epf;
+ u32 cfg;
+ u8 fn = 0;
+
+ /* Enable this endpoint function. */
+ cfg = cdns_pcie_readl(pcie, CDNS_PCIE_LM_EP_FUNC_CFG);
+ cfg |= BIT(fn);
+ cdns_pcie_writel(pcie, CDNS_PCIE_LM_EP_FUNC_CFG, cfg);
+
+ /*
+ * Already linked-up: don't call directly pci_epc_linkup() because we've
+ * already locked the epc->lock.
+ */
+ list_for_each_entry(epf, &epc->pci_epf, list)
+ pci_epf_linkup(epf);
+
+ return 0;
+}
+
+static void cdns_pcie_ep_stop(struct pci_epc *epc)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 cfg;
+ u8 fn = 0;
+
+ /* Disable this endpoint function (function 0 can't be disabled). */
+ cfg = cdns_pcie_readl(pcie, CDNS_PCIE_LM_EP_FUNC_CFG);
+ cfg &= ~BIT(fn);
+ cdns_pcie_writel(pcie, CDNS_PCIE_LM_EP_FUNC_CFG, cfg);
+}
+
+static const struct pci_epc_ops cdns_pcie_epc_ops = {
+ .write_header = cdns_pcie_ep_write_header,
+ .set_bar = cdns_pcie_ep_set_bar,
+ .clear_bar = cdns_pcie_ep_clear_bar,
+ .map_addr = cdns_pcie_ep_map_addr,
+ .unmap_addr = cdns_pcie_ep_unmap_addr,
+ .set_msi = cdns_pcie_ep_set_msi,
+ .get_msi = cdns_pcie_ep_get_msi,
+ .raise_irq = cdns_pcie_ep_raise_irq,
+ .start = cdns_pcie_ep_start,
+ .stop = cdns_pcie_ep_stop,
+};
+
+static const struct cdns_pcie_ep_data cdns_pcie_ep_data = {
+ .max_regions = 16,
+};
+
+static const struct of_device_id cdns_pcie_ep_of_match[] = {
+ { .compatible = "cdns,cdns-pcie-ep",
+ .data = &cdns_pcie_ep_data },
+
+ { },
+};
+
+static int cdns_pcie_ep_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ const struct of_device_id *of_id;
+ struct cdns_pcie_ep *ep;
+ struct cdns_pcie *pcie;
+ struct pci_epc *epc;
+ struct resource *res;
+ size_t max_regions;
+ int ret;
+
+ ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
+ if (!ep)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, ep);
+
+ pcie = &ep->pcie;
+ pcie->is_rc = false;
+
+ of_id = of_match_node(cdns_pcie_ep_of_match, np);
+ ep->data = (const struct cdns_pcie_ep_data *)of_id->data;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "reg");
+ pcie->reg_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(pcie->reg_base)) {
+ dev_err(dev, "missing \"reg\"\n");
+ return PTR_ERR(pcie->reg_base);
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
+ if (!res) {
+ dev_err(dev, "missing \"mem\"\n");
+ return -EINVAL;
+ }
+ pcie->mem_res = res;
+
+ max_regions = ep->data->max_regions;
+ ep->ob_addr = devm_kzalloc(dev, max_regions * sizeof(*ep->ob_addr),
+ GFP_KERNEL);
+ if (!ep->ob_addr)
+ return -ENOMEM;
+
+ pm_runtime_enable(dev);
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ dev_err(dev, "pm_runtime_get_sync() failed\n");
+ goto err_get_sync;
+ }
+
+ /* Disable all but function 0 (anyway BIT(0) is hardwired to 1). */
+ cdns_pcie_writel(pcie, CDNS_PCIE_LM_EP_FUNC_CFG, BIT(0));
+
+ epc = devm_pci_epc_create(dev, &cdns_pcie_epc_ops);
+ if (IS_ERR(epc)) {
+ dev_err(dev, "failed to create epc device\n");
+ ret = PTR_ERR(epc);
+ goto err_init;
+ }
+
+ ep->epc = epc;
+ epc_set_drvdata(epc, ep);
+
+ ret = of_property_read_u8(np, "max-functions", &epc->max_functions);
+ if (ret < 0)
+ epc->max_functions = 1;
+
+ ret = pci_epc_mem_init(epc, pcie->mem_res->start,
+ resource_size(pcie->mem_res));
+ if (ret < 0) {
+ dev_err(dev, "failed to initialize the memory space\n");
+ goto err_init;
+ }
+
+ ep->irq_cpu_addr = pci_epc_mem_alloc_addr(epc, &ep->irq_phys_addr,
+ SZ_128K);
+ if (!ep->irq_cpu_addr) {
+ dev_err(dev, "failed to reserve memory space for MSI\n");
+ ret = -ENOMEM;
+ goto free_epc_mem;
+ }
+ ep->irq_pci_addr = CDNS_PCIE_EP_IRQ_PCI_ADDR_NONE;
+
+ return 0;
+
+ free_epc_mem:
+ pci_epc_mem_exit(epc);
+
+ err_init:
+ pm_runtime_put_sync(dev);
+
+ err_get_sync:
+ pm_runtime_disable(dev);
+
+ return ret;
+}
+
+static struct platform_driver cdns_pcie_ep_driver = {
+ .driver = {
+ .name = "cdns-pcie-ep",
+ .of_match_table = cdns_pcie_ep_of_match,
+ },
+ .probe = cdns_pcie_ep_probe,
+};
+builtin_platform_driver(cdns_pcie_ep_driver);
--
2.11.0