Add PCI endpoint test driver that can verify base address register and legacy interrupt. (TODO: buffer tests and MSI interrupt). The corresponding pci-epf-test function driver should be used on the EP side. Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx> --- drivers/misc/Kconfig | 7 + drivers/misc/Makefile | 1 + drivers/misc/pci_endpoint_test.c | 291 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 299 insertions(+) create mode 100644 drivers/misc/pci_endpoint_test.c diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index d002528..c578f97 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -794,6 +794,13 @@ config PANEL_BOOT_MESSAGE An empty message will only clear the display at driver init time. Any other printf()-formatted message is valid with newline and escape codes. +config PCI_ENDPOINT_TEST + depends on PCI + tristate "PCI Endpoint Test driver" + ---help--- + Enable this configuration option to enable the host side test driver + for PCI Endpoint. + source "drivers/misc/c2port/Kconfig" source "drivers/misc/eeprom/Kconfig" source "drivers/misc/cb710/Kconfig" diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index fb32516..fe6ff69 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -56,6 +56,7 @@ obj-$(CONFIG_ECHO) += echo/ obj-$(CONFIG_VEXPRESS_SYSCFG) += vexpress-syscfg.o obj-$(CONFIG_CXL_BASE) += cxl/ obj-$(CONFIG_PANEL) += panel.o +obj-$(CONFIG_PCI_ENDPOINT_TEST) += pci_endpoint_test.o lkdtm-$(CONFIG_LKDTM) += lkdtm_core.o lkdtm-$(CONFIG_LKDTM) += lkdtm_bugs.o diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c new file mode 100644 index 0000000..221a2ce --- /dev/null +++ b/drivers/misc/pci_endpoint_test.c @@ -0,0 +1,291 @@ +/** + * ep_f_test.c - Host side test driver to test endpoint functionality + * + * Copyright (C) 2016 Texas Instruments + * Author: Kishon Vijay Abraham I <kishon@xxxxxx> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 of + * the License 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/delay.h> +#include <linux/io.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/pci.h> +#include <linux/pci_ids.h> + +#include <linux/pci_regs.h> + +#define DRV_MODULE_NAME "pci-endpoint-test" + +#define PCI_ENDPOINT_TEST_COMMAND 0x0 +#define COMMAND_RESET BIT(0) +#define COMMAND_RAISE_IRQ BIT(1) +#define COMMAND_COPY BIT(2) + +#define PCI_ENDPOINT_TEST_STATUS 0x4 +#define STATUS_INITIALIZED BIT(0) +#define STATUS_COPY_PROGRESS BIT(1) +#define STATUS_COPY_DONE BIT(2) +#define STATUS_IRQ_RAISED BIT(3) +#define STATUS_SOURCE_ADDR_INVALID BIT(4) +#define STATUS_DEST_ADDR_INVALID BIT(5) + +#define PCI_ENDPOINT_TEST_SRC_ADDR 0x8 +#define PCI_ENDPOINT_TEST_DST_ADDR 0x10 + +enum pci_barno { + BAR_0, + BAR_1, + BAR_2, + BAR_3, + BAR_4, + BAR_5, +}; + +struct pci_endpoint_test { + struct pci_dev *pdev; + void *base; + void *bar[5]; + struct completion irq_raised; +}; + +static char *result[] = { "NOT OKAY", "OKAY" }; +static int bar_size[] = { 512, 1024, 16384, 131072, 1048576 }; + +static inline u32 pci_endpoint_test_readl(struct pci_endpoint_test *test, + u32 offset) +{ + return readl(test->base + offset); +} + +static inline void pci_endpoint_test_writel(struct pci_endpoint_test *test, + u32 offset, u32 value) +{ + writel(value, test->base + offset); +} + +static inline u32 pci_endpoint_test_bar_readl(struct pci_endpoint_test *test, + int bar, int offset) +{ + return readl(test->bar[bar] + offset); +} + +static inline void pci_endpoint_test_bar_writel(struct pci_endpoint_test *test, + int bar, u32 offset, u32 value) +{ + writel(value, test->bar[bar] + offset); +} + +static irqreturn_t pci_endpoint_test_irqhandler(int irq, void *dev_id) +{ + struct pci_endpoint_test *test = dev_id; + u32 reg; + + reg = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_STATUS); + if (reg & STATUS_IRQ_RAISED) { + complete(&test->irq_raised); + reg &= ~STATUS_IRQ_RAISED; + } + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_STATUS, + reg); + + return IRQ_HANDLED; +} + +static bool pci_endpoint_test_reset(struct pci_endpoint_test *test) +{ + int i; + u32 val; + + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND, + COMMAND_RESET); + for (i = 0; i < 5; i++) { + val = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_STATUS); + if (val & STATUS_INITIALIZED) + return true; + usleep_range(100, 200); + } + + return false; +} + +static bool pci_endpoint_test_bar(struct pci_endpoint_test *test, + enum pci_barno barno) +{ + int j; + u32 val; + int size; + + if (!test->bar[barno - 1]) + return false; + + size = bar_size[barno - 1]; + + for (j = 0; j < size; j += 4) + pci_endpoint_test_bar_writel(test, barno - 1, j, 0xA0A0A0A0); + + for (j = 0; j < size; j += 4) { + val = pci_endpoint_test_bar_readl(test, barno - 1, j); + if (val != 0xA0A0A0A0) + return false; + } + + return true; +} + +static bool pci_endpoint_test_irq(struct pci_endpoint_test *test) +{ + u32 val; + + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND, + COMMAND_RAISE_IRQ); + val = wait_for_completion_timeout(&test->irq_raised, + msecs_to_jiffies(1000)); + if (!val) + return false; + + return true; +} + +static int pci_endpoint_test_begin(struct pci_endpoint_test *test) +{ + bool ret; + enum pci_barno bar; + + pr_info("****** Testing pci-endpoint-test Device ******\n"); + + ret = pci_endpoint_test_reset(test); + pr_info("Reset: %s\n", result[ret]); + + for (bar = BAR_1; bar <= BAR_5; bar++) { + ret = pci_endpoint_test_bar(test, bar); + pr_info("BAR%d %s\n", bar, result[ret]); + } + + ret = pci_endpoint_test_irq(test); + pr_info("Legacy IRQ: %s\n", result[ret]); + + pr_info("****** End Test ******\n"); + + return 0; +} + +static int pci_endpoint_test_probe(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + int err; + enum pci_barno bar; + void __iomem *base; + struct device *dev = &pdev->dev; + struct pci_endpoint_test *test; + + if (pci_is_bridge(pdev)) + return -ENODEV; + + test = devm_kzalloc(dev, sizeof(*test), GFP_KERNEL); + if (!test) + return -ENOMEM; + + test->pdev = pdev; + init_completion(&test->irq_raised); + + err = pci_enable_device(pdev); + if (err) { + dev_err(dev, "Cannot enable PCI device\n"); + return err; + } + + err = pci_request_regions(pdev, DRV_MODULE_NAME); + if (err) { + dev_err(dev, "Cannot obtain PCI resources\n"); + goto err_disable_pdev; + } + + pci_set_master(pdev); + + base = pci_ioremap_bar(pdev, BAR_0); + if (!base) { + dev_err(dev, "Cannot map test device registers\n"); + err = -ENOMEM; + goto err_release_region; + } + + test->base = base; + + err = request_irq(pdev->irq, pci_endpoint_test_irqhandler, IRQF_SHARED, + DRV_MODULE_NAME, test); + if (err) { + dev_err(dev, "failed to request irq\n"); + goto err_iounmap; + } + + for (bar = BAR_1; bar <= BAR_5; bar++) { + base = pci_ioremap_bar(pdev, bar); + if (!base) + dev_err(dev, "failed to read BAR%d\n", bar); + test->bar[bar - 1] = base; + } + + pci_set_drvdata(pdev, test); + pci_endpoint_test_begin(test); + + return 0; + +err_iounmap: + iounmap(test->base); + +err_release_region: + pci_release_regions(pdev); + +err_disable_pdev: + pci_disable_device(pdev); + + return err; +} + +static void pci_endpoint_test_remove(struct pci_dev *pdev) +{ + struct pci_endpoint_test *test = pci_get_drvdata(pdev); + enum pci_barno bar; + + iounmap(test->base); + + for (bar = BAR_1; bar <= BAR_5; bar++) { + if (test->bar[bar - 1]) + iounmap(test->bar[bar - 1]); + } + + pci_release_regions(pdev); + pci_disable_device(pdev); +} + +static const struct pci_device_id pci_endpoint_test_tbl[] = { + { PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_ANY_ID) }, + { } +}; +MODULE_DEVICE_TABLE(pci, pci_endpoint_test_tbl); + +static struct pci_driver pci_endpoint_test_driver = { + .name = DRV_MODULE_NAME, + .id_table = pci_endpoint_test_tbl, + .probe = pci_endpoint_test_probe, + .remove = pci_endpoint_test_remove, +}; +module_pci_driver(pci_endpoint_test_driver); + +MODULE_DESCRIPTION("PCI ENDPOINT TEST DRIVER"); +MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@xxxxxx>"); +MODULE_LICENSE("GPL v2"); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
