diff options
Diffstat (limited to 'drivers/staging/kpc2000/kpc2000/core.c')
| -rw-r--r-- | drivers/staging/kpc2000/kpc2000/core.c | 437 |
1 files changed, 437 insertions, 0 deletions
diff --git a/drivers/staging/kpc2000/kpc2000/core.c b/drivers/staging/kpc2000/kpc2000/core.c new file mode 100644 index 000000000000..40390cdd3c8d --- /dev/null +++ b/drivers/staging/kpc2000/kpc2000/core.c @@ -0,0 +1,437 @@ +// SPDX-License-Identifier: GPL-2.0+ +#include <linux/init.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/types.h> +#include <linux/export.h> +#include <linux/slab.h> +#include <asm/io.h> +#include <linux/io.h> +#include <linux/mfd/core.h> +#include <linux/platform_device.h> +#include <linux/ioport.h> +#include <linux/io-64-nonatomic-lo-hi.h> +#include <linux/interrupt.h> +#include <linux/workqueue.h> +#include <linux/device.h> +#include <linux/sched.h> +#include <linux/jiffies.h> +#include "pcie.h" + + +/******************************************************* + * SysFS Attributes + ******************************************************/ +static ssize_t show_attr(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct kp2000_device *pcard; + + if (!pdev) return -ENXIO; + pcard = pci_get_drvdata(pdev); + if (!pcard) return -ENXIO; + + if (strcmp("ssid", attr->attr.name) == 0){ return scnprintf(buf, PAGE_SIZE, "%016llx\n", pcard->ssid); } else + if (strcmp("ddna", attr->attr.name) == 0){ return scnprintf(buf, PAGE_SIZE, "%016llx\n", pcard->ddna); } else + if (strcmp("card_id", attr->attr.name) == 0){ return scnprintf(buf, PAGE_SIZE, "%08x\n", pcard->card_id); } else + if (strcmp("hw_rev", attr->attr.name) == 0){ return scnprintf(buf, PAGE_SIZE, "%08x\n", pcard->hardware_revision); } else + if (strcmp("build", attr->attr.name) == 0){ return scnprintf(buf, PAGE_SIZE, "%08x\n", pcard->build_version); } else + if (strcmp("build_date", attr->attr.name) == 0){ return scnprintf(buf, PAGE_SIZE, "%08x\n", pcard->build_datestamp); } else + if (strcmp("build_time", attr->attr.name) == 0){ return scnprintf(buf, PAGE_SIZE, "%08x\n", pcard->build_timestamp); } else + { return -ENXIO; } +} + +static ssize_t show_cpld_config_reg(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct kp2000_device *pcard; + u64 val; + + if (!pdev) + return -ENXIO; + + pcard = pci_get_drvdata(pdev); + if (!pcard) + return -ENXIO; + + val = readq(pcard->sysinfo_regs_base + REG_CPLD_CONFIG); + return scnprintf(buf, PAGE_SIZE, "%016llx\n", val); +} +static ssize_t cpld_reconfigure(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + struct pci_dev *pdev = to_pci_dev(dev); + long wr_val; + struct kp2000_device *pcard; + int rv; + + if (!pdev) return -ENXIO; + pcard = pci_get_drvdata(pdev); + if (!pcard) return -ENXIO; + + rv = kstrtol(buf, 0, &wr_val); + if (rv < 0) return rv; + if (wr_val > 7) return -EINVAL; + + wr_val = wr_val << 8; + wr_val |= 0x1; // Set the "Configure Go" bit + writeq(wr_val, pcard->sysinfo_regs_base + REG_CPLD_CONFIG); + return count; +} + + +DEVICE_ATTR(ssid, 0444, show_attr, NULL); +DEVICE_ATTR(ddna, 0444, show_attr, NULL); +DEVICE_ATTR(card_id, 0444, show_attr, NULL); +DEVICE_ATTR(hw_rev, 0444, show_attr, NULL); +DEVICE_ATTR(build, 0444, show_attr, NULL); +DEVICE_ATTR(build_date, 0444, show_attr, NULL); +DEVICE_ATTR(build_time, 0444, show_attr, NULL); +DEVICE_ATTR(cpld_reg, 0444, show_cpld_config_reg, NULL); +DEVICE_ATTR(cpld_reconfigure, 0220, NULL, cpld_reconfigure); + +static const struct attribute * kp_attr_list[] = { + &dev_attr_ssid.attr, + &dev_attr_ddna.attr, + &dev_attr_card_id.attr, + &dev_attr_hw_rev.attr, + &dev_attr_build.attr, + &dev_attr_build_date.attr, + &dev_attr_build_time.attr, + &dev_attr_cpld_reg.attr, + &dev_attr_cpld_reconfigure.attr, + NULL, +}; + + +/******************************************************* + * Functions + ******************************************************/ + +static void wait_and_read_ssid(struct kp2000_device *pcard) +{ + u64 read_val = readq(pcard->sysinfo_regs_base + REG_FPGA_SSID); + unsigned long timeout; + + if (read_val & 0x8000000000000000){ + pcard->ssid = read_val; + return; + } + + timeout = jiffies + (HZ * 2); + do { + read_val = readq(pcard->sysinfo_regs_base + REG_FPGA_SSID); + if (read_val & 0x8000000000000000){ + pcard->ssid = read_val; + return; + } + cpu_relax(); + //schedule(); + } while (time_before(jiffies, timeout)); + + dev_notice(&pcard->pdev->dev, "SSID didn't show up!\n"); + + #if 0 + // Timed out waiting for the SSID to show up, just use the DDNA instead? + read_val = readq(pcard->sysinfo_regs_base + REG_FPGA_DDNA); + pcard->ssid = read_val; + #else + // Timed out waiting for the SSID to show up, stick all zeros in the value + pcard->ssid = 0; + #endif +} + +static int read_system_regs(struct kp2000_device *pcard) +{ + u64 read_val; + + read_val = readq(pcard->sysinfo_regs_base + REG_MAGIC_NUMBER); + if (read_val != KP2000_MAGIC_VALUE){ + dev_err(&pcard->pdev->dev, "Invalid magic! Got: 0x%016llx Want: 0x%016lx\n", read_val, KP2000_MAGIC_VALUE); + return -EILSEQ; + } + + read_val = readq(pcard->sysinfo_regs_base + REG_CARD_ID_AND_BUILD); + pcard->card_id = (read_val & 0xFFFFFFFF00000000) >> 32; + pcard->build_version = (read_val & 0x00000000FFFFFFFF) >> 0; + + read_val = readq(pcard->sysinfo_regs_base + REG_DATE_AND_TIME_STAMPS); + pcard->build_datestamp = (read_val & 0xFFFFFFFF00000000) >> 32; + pcard->build_timestamp = (read_val & 0x00000000FFFFFFFF) >> 0; + + read_val = readq(pcard->sysinfo_regs_base + REG_CORE_TABLE_OFFSET); + pcard->core_table_length = (read_val & 0xFFFFFFFF00000000) >> 32; + pcard->core_table_offset = (read_val & 0x00000000FFFFFFFF) >> 0; + + wait_and_read_ssid(pcard); + + read_val = readq(pcard->sysinfo_regs_base + REG_FPGA_HW_ID); + pcard->core_table_rev = (read_val & 0x0000000000000F00) >> 8; + pcard->hardware_revision = (read_val & 0x000000000000001F); + + read_val = readq(pcard->sysinfo_regs_base + REG_FPGA_DDNA); + pcard->ddna = read_val; + + dev_info(&pcard->pdev->dev, "system_regs: %08x %08x %08x %08x %02x %d %d %016llx %016llx\n", + pcard->card_id, + pcard->build_version, + pcard->build_datestamp, + pcard->build_timestamp, + pcard->hardware_revision, + pcard->core_table_rev, + pcard->core_table_length, + pcard->ssid, + pcard->ddna + ); + + if (pcard->core_table_rev > 1){ + dev_err(&pcard->pdev->dev, "core table entry revision is higher than we can deal with, cannot continue with this card!\n"); + return 1; + } + + return 0; +} + +irqreturn_t kp2000_irq_handler(int irq, void *dev_id) +{ + struct kp2000_device *pcard = (struct kp2000_device*)dev_id; + SetBackEndControl(pcard->dma_common_regs, KPC_DMA_CARD_IRQ_ENABLE | KPC_DMA_CARD_USER_INTERRUPT_MODE | KPC_DMA_CARD_USER_INTERRUPT_ACTIVE); + return IRQ_HANDLED; +} + +int kp2000_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + int err = 0; + struct kp2000_device *pcard; + static int card_count = 1; + int rv; + unsigned long reg_bar_phys_addr; + unsigned long reg_bar_phys_len; + unsigned long dma_bar_phys_addr; + unsigned long dma_bar_phys_len; + u16 regval; + + dev_dbg(&pdev->dev, "kp2000_pcie_probe(pdev = [%p], id = [%p])\n", pdev, id); + + //{ Step 1: Allocate a struct for the pcard + pcard = kzalloc(sizeof(struct kp2000_device), GFP_KERNEL); + if (NULL == pcard){ + dev_err(&pdev->dev, "probe: failed to allocate private card data\n"); + return -ENOMEM; + } + dev_dbg(&pdev->dev, "probe: allocated struct kp2000_device @ %p\n", pcard); + //} + + //{ Step 2: Initialize trivial pcard elements + pcard->card_num = card_count; + card_count++; + scnprintf(pcard->name, 16, "kpcard%d", pcard->card_num); + + mutex_init(&pcard->sem); + lock_card(pcard); + + pcard->pdev = pdev; + pci_set_drvdata(pdev, pcard); + //} + + //{ Step 3: Enable PCI device + err = pci_enable_device(pcard->pdev); + if (err){ + dev_err(&pcard->pdev->dev, "probe: failed to enable PCIE2000 PCIe device (%d)\n", err); + goto out3; + } + //} + + //{ Step 4: Setup the Register BAR + reg_bar_phys_addr = pci_resource_start(pcard->pdev, REG_BAR); + reg_bar_phys_len = pci_resource_len(pcard->pdev, REG_BAR); + + pcard->regs_bar_base = ioremap_nocache(reg_bar_phys_addr, PAGE_SIZE); + if (NULL == pcard->regs_bar_base){ + dev_err(&pcard->pdev->dev, "probe: REG_BAR could not remap memory to virtual space\n"); + err = -ENODEV; + goto out4; + } + dev_dbg(&pcard->pdev->dev, "probe: REG_BAR virt hardware address start [%p]\n", pcard->regs_bar_base); + + err = pci_request_region(pcard->pdev, REG_BAR, KP_DRIVER_NAME_KP2000); + if (err){ + iounmap(pcard->regs_bar_base); + dev_err(&pcard->pdev->dev, "probe: failed to acquire PCI region (%d)\n", err); + err = -ENODEV; + goto out4; + } + + pcard->regs_base_resource.start = reg_bar_phys_addr; + pcard->regs_base_resource.end = reg_bar_phys_addr + reg_bar_phys_len - 1; + pcard->regs_base_resource.flags = IORESOURCE_MEM; + //} + + //{ Step 5: Setup the DMA BAR + dma_bar_phys_addr = pci_resource_start(pcard->pdev, DMA_BAR); + dma_bar_phys_len = pci_resource_len(pcard->pdev, DMA_BAR); + + pcard->dma_bar_base = ioremap_nocache(dma_bar_phys_addr, dma_bar_phys_len); + if (NULL == pcard->dma_bar_base){ + dev_err(&pcard->pdev->dev, "probe: DMA_BAR could not remap memory to virtual space\n"); + err = -ENODEV; + goto out5; + } + dev_dbg(&pcard->pdev->dev, "probe: DMA_BAR virt hardware address start [%p]\n", pcard->dma_bar_base); + + pcard->dma_common_regs = pcard->dma_bar_base + KPC_DMA_COMMON_OFFSET; + + err = pci_request_region(pcard->pdev, DMA_BAR, "kp2000_pcie"); + if (err){ + iounmap(pcard->dma_bar_base); + dev_err(&pcard->pdev->dev, "probe: failed to acquire PCI region (%d)\n", err); + err = -ENODEV; + goto out5; + } + + pcard->dma_base_resource.start = dma_bar_phys_addr; + pcard->dma_base_resource.end = dma_bar_phys_addr + dma_bar_phys_len - 1; + pcard->dma_base_resource.flags = IORESOURCE_MEM; + //} + + //{ Step 6: System Regs + pcard->sysinfo_regs_base = pcard->regs_bar_base; + err = read_system_regs(pcard); + if (err) + goto out6; + + // Disable all "user" interrupts because they're not used yet. + writeq(0xFFFFFFFFFFFFFFFF, pcard->sysinfo_regs_base + REG_INTERRUPT_MASK); + //} + + //{ Step 7: Configure PCI thingies + // let the card master PCIe + pci_set_master(pcard->pdev); + // enable IO and mem if not already done + pci_read_config_word(pcard->pdev, PCI_COMMAND, ®val); + regval |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY); + pci_write_config_word(pcard->pdev, PCI_COMMAND, regval); + + // Clear relaxed ordering bit + pcie_capability_clear_and_set_word(pcard->pdev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN, 0); + + // Set Max_Payload_Size and Max_Read_Request_Size + regval = (0x0) << 5; // Max_Payload_Size = 128 B + pcie_capability_clear_and_set_word(pcard->pdev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_PAYLOAD, regval); + regval = (0x0) << 12; // Max_Read_Request_Size = 128 B + pcie_capability_clear_and_set_word(pcard->pdev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_READRQ, regval); + + // Enable error reporting for: Correctable Errors, Non-Fatal Errors, Fatal Errors, Unsupported Requests + pcie_capability_clear_and_set_word(pcard->pdev, PCI_EXP_DEVCTL, 0, PCI_EXP_DEVCTL_CERE | PCI_EXP_DEVCTL_NFERE | PCI_EXP_DEVCTL_FERE | PCI_EXP_DEVCTL_URRE); + + err = dma_set_mask(PCARD_TO_DEV(pcard), DMA_BIT_MASK(64)); + if (err){ + dev_err(&pcard->pdev->dev, "CANNOT use DMA mask %0llx\n", DMA_BIT_MASK(64)); + goto out7; + } + dev_dbg(&pcard->pdev->dev, "Using DMA mask %0llx\n", dma_get_mask(PCARD_TO_DEV(pcard))); + //} + + //{ Step 8: Configure IRQs + err = pci_enable_msi(pcard->pdev); + if (err < 0) + goto out8a; + + rv = request_irq(pcard->pdev->irq, kp2000_irq_handler, IRQF_SHARED, pcard->name, pcard); + if (rv){ + dev_err(&pcard->pdev->dev, "kp2000_pcie_probe: failed to request_irq: %d\n", rv); + goto out8b; + } + //} + + //{ Step 9: Setup sysfs attributes + err = sysfs_create_files(&(pdev->dev.kobj), kp_attr_list); + if (err){ + dev_err(&pdev->dev, "Failed to add sysfs files: %d\n", err); + goto out9; + } + //} + + //{ Step 10: Setup misc device + pcard->miscdev.minor = MISC_DYNAMIC_MINOR; + pcard->miscdev.fops = &kp2000_fops; + pcard->miscdev.parent = &pcard->pdev->dev; + pcard->miscdev.name = pcard->name; + + err = misc_register(&pcard->miscdev); + if (err){ + dev_err(&pcard->pdev->dev, "kp2000_pcie_probe: misc_register failed: %d\n", err); + goto out10; + } + //} + + //{ Step 11: Probe cores + err = kp2000_probe_cores(pcard); + if (err) + goto out11; + //} + + //{ Step 12: Enable IRQs in HW + SetBackEndControl(pcard->dma_common_regs, KPC_DMA_CARD_IRQ_ENABLE | KPC_DMA_CARD_USER_INTERRUPT_MODE); + //} + + dev_dbg(&pcard->pdev->dev, "kp2000_pcie_probe() complete!\n"); + unlock_card(pcard); + return 0; + + out11: + misc_deregister(&pcard->miscdev); + out10: + sysfs_remove_files(&(pdev->dev.kobj), kp_attr_list); + out9: + free_irq(pcard->pdev->irq, pcard); + out8b: + pci_disable_msi(pcard->pdev); + out8a: + out7: + out6: + iounmap(pcard->dma_bar_base); + pci_release_region(pdev, DMA_BAR); + pcard->dma_bar_base = NULL; + out5: + iounmap(pcard->regs_bar_base); + pci_release_region(pdev, REG_BAR); + pcard->regs_bar_base = NULL; + out4: + pci_disable_device(pcard->pdev); + out3: + unlock_card(pcard); + kfree(pcard); + return err; +} + + +void kp2000_pcie_remove(struct pci_dev *pdev) +{ + struct kp2000_device *pcard = pci_get_drvdata(pdev); + + dev_dbg(&pdev->dev, "kp2000_pcie_remove(pdev=%p)\n", pdev); + + if (pcard == NULL) return; + + lock_card(pcard); + kp2000_remove_cores(pcard); + mfd_remove_devices(PCARD_TO_DEV(pcard)); + misc_deregister(&pcard->miscdev); + sysfs_remove_files(&(pdev->dev.kobj), kp_attr_list); + free_irq(pcard->pdev->irq, pcard); + pci_disable_msi(pcard->pdev); + if (pcard->dma_bar_base != NULL){ + iounmap(pcard->dma_bar_base); + pci_release_region(pdev, DMA_BAR); + pcard->dma_bar_base = NULL; + } + if (pcard->regs_bar_base != NULL){ + iounmap(pcard->regs_bar_base); + pci_release_region(pdev, REG_BAR); + pcard->regs_bar_base = NULL; + } + pci_disable_device(pcard->pdev); + pci_set_drvdata(pdev, NULL); + unlock_card(pcard); + kfree(pcard); +} |