drivers/staging/kpc2000/kpc2000/cell_probe.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/types.h>
 #include <linux/export.h>
 #include <linux/slab.h>
 #include <linux/io.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 #include <linux/mfd/core.h>
 #include <linux/platform_device.h>
 #include <linux/ioport.h>
 #include <linux/uio_driver.h>
 #include "pcie.h"

 /*  Core (Resource) Table Layout:
  *      one Resource per record (8 bytes)
  *                 6         5         4         3         2         1         0
  *              3210987654321098765432109876543210987654321098765432109876543210
  *              IIIIIIIIIIII                                                        Core Type    [up to 4095 types]
  *                          D                                                       S2C DMA Present
  *                           DDD                                                    S2C DMA Channel Number    [up to 8 channels]
  *                              LLLLLLLLLLLLLLLL                                    Register Count (64-bit registers)    [up to 65535 registers]
  *                                              OOOOOOOOOOOOOOOO                    Core Offset (in 4kB blocks)    [up to 65535 cores]
  *                                                              D                   C2S DMA Present
  *                                                               DDD                C2S DMA Channel Number    [up to 8 channels]
  *                                                                  II              IRQ Count [0 to 3 IRQs per core]
  *                                                                    1111111000
  *                                                                    IIIIIII       IRQ Base Number [up to 128 IRQs per card]
  *                                                                           ___    Spare
  *
  */

 #define KPC_OLD_DMA_CH_NUM(present, channel)   ((present) ? (0x8 | ((channel) & 0x7)) : 0)
 #define KPC_OLD_S2C_DMA_CH_NUM(cte)   KPC_OLD_DMA_CH_NUM(cte.s2c_dma_present, cte.s2c_dma_channel_num)
 #define KPC_OLD_C2S_DMA_CH_NUM(cte)   KPC_OLD_DMA_CH_NUM(cte.c2s_dma_present, cte.c2s_dma_channel_num)

 #define KP_CORE_ID_INVALID      0
 #define KP_CORE_ID_I2C          3
 #define KP_CORE_ID_SPI          5

 struct core_table_entry {
 	u16  type;
 	u32  offset;
 	u32  length;
 	bool s2c_dma_present;
 	u8   s2c_dma_channel_num;
 	bool c2s_dma_present;
 	u8   c2s_dma_channel_num;
 	u8   irq_count;
 	u8   irq_base_num;
 };

 static
 void  parse_core_table_entry_v0(struct core_table_entry *cte, const u64 read_val)
 {
 	cte->type                = ((read_val & 0xFFF0000000000000UL) >> 52);
 	cte->offset              = ((read_val & 0x00000000FFFF0000UL) >> 16) * 4096;
 	cte->length              = ((read_val & 0x0000FFFF00000000UL) >> 32) * 8;
 	cte->s2c_dma_present     = ((read_val & 0x0008000000000000UL) >> 51);
 	cte->s2c_dma_channel_num = ((read_val & 0x0007000000000000UL) >> 48);
 	cte->c2s_dma_present     = ((read_val & 0x0000000000008000UL) >> 15);
 	cte->c2s_dma_channel_num = ((read_val & 0x0000000000007000UL) >> 12);
 	cte->irq_count           = ((read_val & 0x0000000000000C00UL) >> 10);
 	cte->irq_base_num        = ((read_val & 0x00000000000003F8UL) >>  3);
 }

 static
 void dbg_cte(struct kp2000_device *pcard, struct core_table_entry *cte)
 {
 	dev_dbg(&pcard->pdev->dev, "CTE: type:%3d  offset:%3d (%3d)  length:%3d (%3d)  s2c:%d  c2s:%d  irq_count:%d  base_irq:%d\n",
 		cte->type,
 		cte->offset,
 		cte->offset / 4096,
 		cte->length,
 		cte->length / 8,
 		(cte->s2c_dma_present ? cte->s2c_dma_channel_num : -1),
 		(cte->c2s_dma_present ? cte->c2s_dma_channel_num : -1),
 		cte->irq_count,
 		cte->irq_base_num
 	);
 }

 static
 void parse_core_table_entry(struct core_table_entry *cte, const u64 read_val, const u8 entry_rev)
 {
 	switch (entry_rev) {
 	case 0:
 		parse_core_table_entry_v0(cte, read_val);
 		break;
 	default:
 		cte->type = 0;
 		break;
 	}
 }

 static int probe_core_basic(unsigned int core_num, struct kp2000_device *pcard,
 			    char *name, const struct core_table_entry cte)
 {
 	struct mfd_cell  cell = { .id = core_num, .name = name };
 	struct resource resources[2];

 	struct kpc_core_device_platdata core_pdata = {
 		.card_id           = pcard->card_id,
 		.build_version     = pcard->build_version,
 		.hardware_revision = pcard->hardware_revision,
 		.ssid              = pcard->ssid,
 		.ddna              = pcard->ddna,
 	};

 	dev_dbg(&pcard->pdev->dev, "Found Basic core: type = %02d  dma = %02x / %02x  offset = 0x%x  length = 0x%x (%d regs)\n", cte.type, KPC_OLD_S2C_DMA_CH_NUM(cte), KPC_OLD_C2S_DMA_CH_NUM(cte), cte.offset, cte.length, cte.length / 8);

 	cell.platform_data = &core_pdata;
 	cell.pdata_size = sizeof(struct kpc_core_device_platdata);
 	cell.num_resources = 2;

 	memset(&resources, 0, sizeof(resources));

 	resources[0].start = cte.offset;
 	resources[0].end   = cte.offset + (cte.length - 1);
 	resources[0].flags = IORESOURCE_MEM;

 	resources[1].start = pcard->pdev->irq;
 	resources[1].end   = pcard->pdev->irq;
 	resources[1].flags = IORESOURCE_IRQ;

 	cell.resources = resources;

 	return mfd_add_devices(PCARD_TO_DEV(pcard),    // parent
 			       pcard->card_num * 100,  // id
 			       &cell,                  // struct mfd_cell *
 			       1,                      // ndevs
 			       &pcard->regs_base_resource,
 			       0,                      // irq_base
 			       NULL);                  // struct irq_domain *
 }

 struct kpc_uio_device {
 	struct list_head list;
 	struct kp2000_device *pcard;
 	struct device  *dev;
 	struct uio_info uioinfo;
 	struct core_table_entry cte;
 	u16 core_num;
 };

 static ssize_t offset_show(struct device *dev, struct device_attribute *attr,
 			   char *buf)
 {
 	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

 	return sprintf(buf, "%u\n", kudev->cte.offset);
 }
 static DEVICE_ATTR_RO(offset);

 static ssize_t size_show(struct device *dev, struct device_attribute *attr,
 			 char *buf)
 {
 	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

 	return sprintf(buf, "%u\n", kudev->cte.length);
 }
 static DEVICE_ATTR_RO(size);

 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 			 char *buf)
 {
 	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

 	return sprintf(buf, "%u\n", kudev->cte.type);
 }
 static DEVICE_ATTR_RO(type);

 static ssize_t s2c_dma_show(struct device *dev, struct device_attribute *attr,
 			    char *buf)
 {
 	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

 	if (!kudev->cte.s2c_dma_present)
 		return sprintf(buf, "%s", "not present\n");

 	return sprintf(buf, "%u\n", kudev->cte.s2c_dma_channel_num);
 }
 static DEVICE_ATTR_RO(s2c_dma);

 static ssize_t c2s_dma_show(struct device *dev, struct device_attribute *attr,
 			    char *buf)
 {
 	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

 	if (!kudev->cte.c2s_dma_present)
 		return sprintf(buf, "%s", "not present\n");

 	return sprintf(buf, "%u\n", kudev->cte.c2s_dma_channel_num);
 }
 static DEVICE_ATTR_RO(c2s_dma);

 static ssize_t irq_count_show(struct device *dev, struct device_attribute *attr,
 			      char *buf)
 {
 	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

 	return sprintf(buf, "%u\n", kudev->cte.irq_count);
 }
 static DEVICE_ATTR_RO(irq_count);

 static ssize_t irq_base_num_show(struct device *dev,
 				 struct device_attribute *attr, char *buf)
 {
 	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

 	return sprintf(buf, "%u\n", kudev->cte.irq_base_num);
 }
 static DEVICE_ATTR_RO(irq_base_num);

 static ssize_t core_num_show(struct device *dev, struct device_attribute *attr,
 			     char *buf)
 {
 	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

 	return sprintf(buf, "%u\n", kudev->core_num);
 }
 static DEVICE_ATTR_RO(core_num);

 struct attribute *kpc_uio_class_attrs[] = {
 	&dev_attr_offset.attr,
 	&dev_attr_size.attr,
 	&dev_attr_type.attr,
 	&dev_attr_s2c_dma.attr,
 	&dev_attr_c2s_dma.attr,
 	&dev_attr_irq_count.attr,
 	&dev_attr_irq_base_num.attr,
 	&dev_attr_core_num.attr,
 	NULL,
 };

 static
 int  kp2000_check_uio_irq(struct kp2000_device *pcard, u32 irq_num)
 {
 	u64 interrupt_active   =  readq(pcard->sysinfo_regs_base + REG_INTERRUPT_ACTIVE);
 	u64 interrupt_mask_inv = ~readq(pcard->sysinfo_regs_base + REG_INTERRUPT_MASK);
 	u64 irq_check_mask = BIT_ULL(irq_num);

 	if (interrupt_active & irq_check_mask) { // if it's active (interrupt pending)
 		if (interrupt_mask_inv & irq_check_mask) {    // and if it's not masked off
 			return 1;
 		}
 	}
 	return 0;
 }

 static
 irqreturn_t  kuio_handler(int irq, struct uio_info *uioinfo)
 {
 	struct kpc_uio_device *kudev = uioinfo->priv;

 	if (irq != kudev->pcard->pdev->irq)
 		return IRQ_NONE;

 	if (kp2000_check_uio_irq(kudev->pcard, kudev->cte.irq_base_num)) {
 		/* Clear the active flag */
 		writeq(BIT_ULL(kudev->cte.irq_base_num),
 		       kudev->pcard->sysinfo_regs_base + REG_INTERRUPT_ACTIVE);
 		return IRQ_HANDLED;
 	}
 	return IRQ_NONE;
 }

 static
 int kuio_irqcontrol(struct uio_info *uioinfo, s32 irq_on)
 {
 	struct kpc_uio_device *kudev = uioinfo->priv;
 	struct kp2000_device *pcard = kudev->pcard;
 	u64 mask;

 	mutex_lock(&pcard->sem);
 	mask = readq(pcard->sysinfo_regs_base + REG_INTERRUPT_MASK);
 	if (irq_on)
 		mask &= ~(BIT_ULL(kudev->cte.irq_base_num));
 	else
 		mask |= BIT_ULL(kudev->cte.irq_base_num);
 	writeq(mask, pcard->sysinfo_regs_base + REG_INTERRUPT_MASK);
 	mutex_unlock(&pcard->sem);

 	return 0;
 }

 static int probe_core_uio(unsigned int core_num, struct kp2000_device *pcard,
 			  char *name, const struct core_table_entry cte)
 {
 	struct kpc_uio_device *kudev;
 	int rv;

 	dev_dbg(&pcard->pdev->dev, "Found UIO core:   type = %02d  dma = %02x / %02x  offset = 0x%x  length = 0x%x (%d regs)\n", cte.type, KPC_OLD_S2C_DMA_CH_NUM(cte), KPC_OLD_C2S_DMA_CH_NUM(cte), cte.offset, cte.length, cte.length / 8);

 	kudev = kzalloc(sizeof(*kudev), GFP_KERNEL);
 	if (!kudev)
 		return -ENOMEM;

 	INIT_LIST_HEAD(&kudev->list);
 	kudev->pcard = pcard;
 	kudev->cte = cte;
 	kudev->core_num = core_num;

 	kudev->uioinfo.priv = kudev;
 	kudev->uioinfo.name = name;
 	kudev->uioinfo.version = "0.0";
 	if (cte.irq_count > 0) {
 		kudev->uioinfo.irq_flags = IRQF_SHARED;
 		kudev->uioinfo.irq = pcard->pdev->irq;
 		kudev->uioinfo.handler = kuio_handler;
 		kudev->uioinfo.irqcontrol = kuio_irqcontrol;
 	} else {
 		kudev->uioinfo.irq = 0;
 	}

 	kudev->uioinfo.mem[0].name = "uiomap";
 	kudev->uioinfo.mem[0].addr = pci_resource_start(pcard->pdev, REG_BAR) + cte.offset;
 	kudev->uioinfo.mem[0].size = (cte.length + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1); // Round up to nearest PAGE_SIZE boundary
 	kudev->uioinfo.mem[0].memtype = UIO_MEM_PHYS;

 	kudev->dev = device_create(kpc_uio_class, &pcard->pdev->dev, MKDEV(0, 0), kudev, "%s.%d.%d.%d", kudev->uioinfo.name, pcard->card_num, cte.type, kudev->core_num);
 	if (IS_ERR(kudev->dev)) {
 		dev_err(&pcard->pdev->dev, "%s: device_create failed!\n",
 			__func__);
 		kfree(kudev);
 		return -ENODEV;
 	}
 	dev_set_drvdata(kudev->dev, kudev);

 	rv = uio_register_device(kudev->dev, &kudev->uioinfo);
 	if (rv) {
 		dev_err(&pcard->pdev->dev, "%s: failed uio_register_device: %d\n",
 			__func__, rv);
 		put_device(kudev->dev);
 		kfree(kudev);
 		return rv;
 	}

 	list_add_tail(&kudev->list, &pcard->uio_devices_list);

 	return 0;
 }

 static int  create_dma_engine_core(struct kp2000_device *pcard, size_t engine_regs_offset, int engine_num, int irq_num)
 {
 	struct mfd_cell  cell = { .id = engine_num };
 	struct resource  resources[2];

 	cell.platform_data = NULL;
 	cell.pdata_size = 0;
 	cell.name = KP_DRIVER_NAME_DMA_CONTROLLER;
 	cell.num_resources = 2;

 	memset(&resources, 0, sizeof(resources));

 	resources[0].start = engine_regs_offset;
 	resources[0].end   = engine_regs_offset + (KPC_DMA_ENGINE_SIZE - 1);
 	resources[0].flags = IORESOURCE_MEM;

 	resources[1].start = irq_num;
 	resources[1].end   = irq_num;
 	resources[1].flags = IORESOURCE_IRQ;

 	cell.resources = resources;

 	return mfd_add_devices(PCARD_TO_DEV(pcard),    // parent
 			       pcard->card_num * 100,  // id
 			       &cell,                  // struct mfd_cell *
 			       1,                      // ndevs
 			       &pcard->dma_base_resource,
 			       0,                      // irq_base
 			       NULL);                  // struct irq_domain *
 }

 static int  kp2000_setup_dma_controller(struct kp2000_device *pcard)
 {
 	int err;
 	unsigned int i;
 	u64 capabilities_reg;

 	// S2C Engines
 	for (i = 0 ; i < 32 ; i++) {
 		capabilities_reg = readq(pcard->dma_bar_base + KPC_DMA_S2C_BASE_OFFSET + (KPC_DMA_ENGINE_SIZE * i));
 		if (capabilities_reg & ENGINE_CAP_PRESENT_MASK) {
 			err = create_dma_engine_core(pcard, (KPC_DMA_S2C_BASE_OFFSET + (KPC_DMA_ENGINE_SIZE * i)), i,  pcard->pdev->irq);
 			if (err)
 				goto err_out;
 		}
 	}
 	// C2S Engines
 	for (i = 0 ; i < 32 ; i++) {
 		capabilities_reg = readq(pcard->dma_bar_base + KPC_DMA_C2S_BASE_OFFSET + (KPC_DMA_ENGINE_SIZE * i));
 		if (capabilities_reg & ENGINE_CAP_PRESENT_MASK) {
 			err = create_dma_engine_core(pcard, (KPC_DMA_C2S_BASE_OFFSET + (KPC_DMA_ENGINE_SIZE * i)), 32 + i,  pcard->pdev->irq);
 			if (err)
 				goto err_out;
 		}
 	}

 	return 0;

 err_out:
 	dev_err(&pcard->pdev->dev, "%s: failed to add a DMA Engine: %d\n",
 		__func__, err);
 	return err;
 }

 int  kp2000_probe_cores(struct kp2000_device *pcard)
 {
 	int err = 0;
 	int i;
 	int current_type_id;
 	u64 read_val;
 	unsigned int highest_core_id = 0;
 	struct core_table_entry cte;

 	err = kp2000_setup_dma_controller(pcard);
 	if (err)
 		return err;

 	INIT_LIST_HEAD(&pcard->uio_devices_list);

 	// First, iterate the core table looking for the highest CORE_ID
 	for (i = 0 ; i < pcard->core_table_length ; i++) {
 		read_val = readq(pcard->sysinfo_regs_base + ((pcard->core_table_offset + i) * 8));
 		parse_core_table_entry(&cte, read_val, pcard->core_table_rev);
 		dbg_cte(pcard, &cte);
 		if (cte.type > highest_core_id)
 			highest_core_id = cte.type;
 		if (cte.type == KP_CORE_ID_INVALID)
 			dev_info(&pcard->pdev->dev, "Found Invalid core: %016llx\n", read_val);
 	}
 	// Then, iterate over the possible core types.
 	for (current_type_id = 1 ; current_type_id <= highest_core_id ; current_type_id++) {
 		unsigned int core_num = 0;
 		// Foreach core type, iterate the whole table and instantiate subdevices for each core.
 		// Yes, this is O(n*m) but the actual runtime is small enough that it's an acceptable tradeoff.
 		for (i = 0 ; i < pcard->core_table_length ; i++) {
 			read_val = readq(pcard->sysinfo_regs_base + ((pcard->core_table_offset + i) * 8));
 			parse_core_table_entry(&cte, read_val, pcard->core_table_rev);

 			if (cte.type != current_type_id)
 				continue;

 			switch (cte.type) {
 			case KP_CORE_ID_I2C:
 				err = probe_core_basic(core_num, pcard,
 						       KP_DRIVER_NAME_I2C, cte);
 				break;

 			case KP_CORE_ID_SPI:
 				err = probe_core_basic(core_num, pcard,
 						       KP_DRIVER_NAME_SPI, cte);
 				break;

 			default:
 				err = probe_core_uio(core_num, pcard, "kpc_uio", cte);
 				break;
 			}
 			if (err) {
 				dev_err(&pcard->pdev->dev,
 					"%s: failed to add core %d: %d\n",
 					__func__, i, err);
 				goto error;
 			}
 			core_num++;
 		}
 	}

 	// Finally, instantiate a UIO device for the core_table.
 	cte.type                = 0; // CORE_ID_BOARD_INFO
 	cte.offset              = 0; // board info is always at the beginning
 	cte.length              = 512 * 8;
 	cte.s2c_dma_present     = false;
 	cte.s2c_dma_channel_num = 0;
 	cte.c2s_dma_present     = false;
 	cte.c2s_dma_channel_num = 0;
 	cte.irq_count           = 0;
 	cte.irq_base_num        = 0;
 	err = probe_core_uio(0, pcard, "kpc_uio", cte);
 	if (err) {
 		dev_err(&pcard->pdev->dev, "%s: failed to add board_info core: %d\n",
 			__func__, err);
 		goto error;
 	}

 	return 0;

 error:
 	kp2000_remove_cores(pcard);
 	mfd_remove_devices(PCARD_TO_DEV(pcard));
 	return err;
 }

 void  kp2000_remove_cores(struct kp2000_device *pcard)
 {
 	struct list_head *ptr;
 	struct list_head *next;

 	list_for_each_safe(ptr, next, &pcard->uio_devices_list) {
 		struct kpc_uio_device *kudev = list_entry(ptr, struct kpc_uio_device, list);

 		uio_unregister_device(&kudev->uioinfo);
 		device_unregister(kudev->dev);
 		list_del(&kudev->list);
 		kfree(kudev);
 	}
 }
	// SPDX-License-Identifier: GPL-2.0+
	#include <linux/module.h>
	#include <linux/pci.h>
	#include <linux/types.h>
	#include <linux/export.h>
	#include <linux/slab.h>
	#include <linux/io.h>
	#include <linux/io-64-nonatomic-lo-hi.h>
	#include <linux/mfd/core.h>
	#include <linux/platform_device.h>
	#include <linux/ioport.h>
	#include <linux/uio_driver.h>
	#include "pcie.h"

	/* Core (Resource) Table Layout:
	* one Resource per record (8 bytes)
	* 6 5 4 3 2 1 0
	* 3210987654321098765432109876543210987654321098765432109876543210
	* IIIIIIIIIIII Core Type [up to 4095 types]
	* D S2C DMA Present
	* DDD S2C DMA Channel Number [up to 8 channels]
	* LLLLLLLLLLLLLLLL Register Count (64-bit registers) [up to 65535 registers]
	* OOOOOOOOOOOOOOOO Core Offset (in 4kB blocks) [up to 65535 cores]
	* D C2S DMA Present
	* DDD C2S DMA Channel Number [up to 8 channels]
	* II IRQ Count [0 to 3 IRQs per core]
	* 1111111000
	* IIIIIII IRQ Base Number [up to 128 IRQs per card]
	* ___ Spare
	*
	*/

	#define KPC_OLD_DMA_CH_NUM(present, channel) ((present) ? (0x8 \| ((channel) & 0x7)) : 0)
	#define KPC_OLD_S2C_DMA_CH_NUM(cte) KPC_OLD_DMA_CH_NUM(cte.s2c_dma_present, cte.s2c_dma_channel_num)
	#define KPC_OLD_C2S_DMA_CH_NUM(cte) KPC_OLD_DMA_CH_NUM(cte.c2s_dma_present, cte.c2s_dma_channel_num)

	#define KP_CORE_ID_INVALID 0
	#define KP_CORE_ID_I2C 3
	#define KP_CORE_ID_SPI 5

	struct core_table_entry {
	u16 type;
	u32 offset;
	u32 length;
	bool s2c_dma_present;
	u8 s2c_dma_channel_num;
	bool c2s_dma_present;
	u8 c2s_dma_channel_num;
	u8 irq_count;
	u8 irq_base_num;
	};

	static
	void parse_core_table_entry_v0(struct core_table_entry *cte, const u64 read_val)
	{
	cte->type = ((read_val & 0xFFF0000000000000UL) >> 52);
	cte->offset = ((read_val & 0x00000000FFFF0000UL) >> 16) * 4096;
	cte->length = ((read_val & 0x0000FFFF00000000UL) >> 32) * 8;
	cte->s2c_dma_present = ((read_val & 0x0008000000000000UL) >> 51);
	cte->s2c_dma_channel_num = ((read_val & 0x0007000000000000UL) >> 48);
	cte->c2s_dma_present = ((read_val & 0x0000000000008000UL) >> 15);
	cte->c2s_dma_channel_num = ((read_val & 0x0000000000007000UL) >> 12);
	cte->irq_count = ((read_val & 0x0000000000000C00UL) >> 10);
	cte->irq_base_num = ((read_val & 0x00000000000003F8UL) >> 3);
	}

	static
	void dbg_cte(struct kp2000_device pcard, struct core_table_entry cte)
	{
	dev_dbg(&pcard->pdev->dev, "CTE: type:%3d offset:%3d (%3d) length:%3d (%3d) s2c:%d c2s:%d irq_count:%d base_irq:%d\n",
	cte->type,
	cte->offset,
	cte->offset / 4096,
	cte->length,
	cte->length / 8,
	(cte->s2c_dma_present ? cte->s2c_dma_channel_num : -1),
	(cte->c2s_dma_present ? cte->c2s_dma_channel_num : -1),
	cte->irq_count,
	cte->irq_base_num
	);
	}

	static
	void parse_core_table_entry(struct core_table_entry *cte, const u64 read_val, const u8 entry_rev)
	{
	switch (entry_rev) {
	case 0:
	parse_core_table_entry_v0(cte, read_val);
	break;
	default:
	cte->type = 0;
	break;
	}
	}

	static int probe_core_basic(unsigned int core_num, struct kp2000_device *pcard,
	char *name, const struct core_table_entry cte)
	{
	struct mfd_cell cell = { .id = core_num, .name = name };
	struct resource resources[2];

	struct kpc_core_device_platdata core_pdata = {
	.card_id = pcard->card_id,
	.build_version = pcard->build_version,
	.hardware_revision = pcard->hardware_revision,
	.ssid = pcard->ssid,
	.ddna = pcard->ddna,
	};

	dev_dbg(&pcard->pdev->dev, "Found Basic core: type = %02d dma = %02x / %02x offset = 0x%x length = 0x%x (%d regs)\n", cte.type, KPC_OLD_S2C_DMA_CH_NUM(cte), KPC_OLD_C2S_DMA_CH_NUM(cte), cte.offset, cte.length, cte.length / 8);

	cell.platform_data = &core_pdata;
	cell.pdata_size = sizeof(struct kpc_core_device_platdata);
	cell.num_resources = 2;

	memset(&resources, 0, sizeof(resources));

	resources[0].start = cte.offset;
	resources[0].end = cte.offset + (cte.length - 1);
	resources[0].flags = IORESOURCE_MEM;

	resources[1].start = pcard->pdev->irq;
	resources[1].end = pcard->pdev->irq;
	resources[1].flags = IORESOURCE_IRQ;

	cell.resources = resources;

	return mfd_add_devices(PCARD_TO_DEV(pcard), // parent
	pcard->card_num * 100, // id
	&cell, // struct mfd_cell *
	1, // ndevs
	&pcard->regs_base_resource,
	0, // irq_base
	NULL); // struct irq_domain *
	}

	struct kpc_uio_device {
	struct list_head list;
	struct kp2000_device *pcard;
	struct device *dev;
	struct uio_info uioinfo;
	struct core_table_entry cte;
	u16 core_num;
	};

	static ssize_t offset_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", kudev->cte.offset);
	}
	static DEVICE_ATTR_RO(offset);

	static ssize_t size_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", kudev->cte.length);
	}
	static DEVICE_ATTR_RO(size);

	static ssize_t type_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", kudev->cte.type);
	}
	static DEVICE_ATTR_RO(type);

	static ssize_t s2c_dma_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

	if (!kudev->cte.s2c_dma_present)
	return sprintf(buf, "%s", "not present\n");

	return sprintf(buf, "%u\n", kudev->cte.s2c_dma_channel_num);
	}
	static DEVICE_ATTR_RO(s2c_dma);

	static ssize_t c2s_dma_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

	if (!kudev->cte.c2s_dma_present)
	return sprintf(buf, "%s", "not present\n");

	return sprintf(buf, "%u\n", kudev->cte.c2s_dma_channel_num);
	}
	static DEVICE_ATTR_RO(c2s_dma);

	static ssize_t irq_count_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", kudev->cte.irq_count);
	}
	static DEVICE_ATTR_RO(irq_count);

	static ssize_t irq_base_num_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", kudev->cte.irq_base_num);
	}
	static DEVICE_ATTR_RO(irq_base_num);

	static ssize_t core_num_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct kpc_uio_device *kudev = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", kudev->core_num);
	}
	static DEVICE_ATTR_RO(core_num);

	struct attribute *kpc_uio_class_attrs[] = {
	&dev_attr_offset.attr,
	&dev_attr_size.attr,
	&dev_attr_type.attr,
	&dev_attr_s2c_dma.attr,
	&dev_attr_c2s_dma.attr,
	&dev_attr_irq_count.attr,
	&dev_attr_irq_base_num.attr,
	&dev_attr_core_num.attr,
	NULL,
	};

	static
	int kp2000_check_uio_irq(struct kp2000_device *pcard, u32 irq_num)
	{
	u64 interrupt_active = readq(pcard->sysinfo_regs_base + REG_INTERRUPT_ACTIVE);
	u64 interrupt_mask_inv = ~readq(pcard->sysinfo_regs_base + REG_INTERRUPT_MASK);
	u64 irq_check_mask = BIT_ULL(irq_num);

	if (interrupt_active & irq_check_mask) { // if it's active (interrupt pending)
	if (interrupt_mask_inv & irq_check_mask) { // and if it's not masked off
	return 1;
	}
	}
	return 0;
	}

	static
	irqreturn_t kuio_handler(int irq, struct uio_info *uioinfo)
	{
	struct kpc_uio_device *kudev = uioinfo->priv;

	if (irq != kudev->pcard->pdev->irq)
	return IRQ_NONE;

	if (kp2000_check_uio_irq(kudev->pcard, kudev->cte.irq_base_num)) {
	/* Clear the active flag */
	writeq(BIT_ULL(kudev->cte.irq_base_num),
	kudev->pcard->sysinfo_regs_base + REG_INTERRUPT_ACTIVE);
	return IRQ_HANDLED;
	}
	return IRQ_NONE;
	}

	static
	int kuio_irqcontrol(struct uio_info *uioinfo, s32 irq_on)
	{
	struct kpc_uio_device *kudev = uioinfo->priv;
	struct kp2000_device *pcard = kudev->pcard;
	u64 mask;

	mutex_lock(&pcard->sem);
	mask = readq(pcard->sysinfo_regs_base + REG_INTERRUPT_MASK);
	if (irq_on)
	mask &= ~(BIT_ULL(kudev->cte.irq_base_num));
	else
	mask \|= BIT_ULL(kudev->cte.irq_base_num);
	writeq(mask, pcard->sysinfo_regs_base + REG_INTERRUPT_MASK);
	mutex_unlock(&pcard->sem);

	return 0;
	}

	static int probe_core_uio(unsigned int core_num, struct kp2000_device *pcard,
	char *name, const struct core_table_entry cte)
	{
	struct kpc_uio_device *kudev;
	int rv;

	dev_dbg(&pcard->pdev->dev, "Found UIO core: type = %02d dma = %02x / %02x offset = 0x%x length = 0x%x (%d regs)\n", cte.type, KPC_OLD_S2C_DMA_CH_NUM(cte), KPC_OLD_C2S_DMA_CH_NUM(cte), cte.offset, cte.length, cte.length / 8);

	kudev = kzalloc(sizeof(*kudev), GFP_KERNEL);
	if (!kudev)
	return -ENOMEM;

	INIT_LIST_HEAD(&kudev->list);
	kudev->pcard = pcard;
	kudev->cte = cte;
	kudev->core_num = core_num;

	kudev->uioinfo.priv = kudev;
	kudev->uioinfo.name = name;
	kudev->uioinfo.version = "0.0";
	if (cte.irq_count > 0) {
	kudev->uioinfo.irq_flags = IRQF_SHARED;
	kudev->uioinfo.irq = pcard->pdev->irq;
	kudev->uioinfo.handler = kuio_handler;
	kudev->uioinfo.irqcontrol = kuio_irqcontrol;
	} else {
	kudev->uioinfo.irq = 0;
	}

	kudev->uioinfo.mem[0].name = "uiomap";
	kudev->uioinfo.mem[0].addr = pci_resource_start(pcard->pdev, REG_BAR) + cte.offset;
	kudev->uioinfo.mem[0].size = (cte.length + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1); // Round up to nearest PAGE_SIZE boundary
	kudev->uioinfo.mem[0].memtype = UIO_MEM_PHYS;

	kudev->dev = device_create(kpc_uio_class, &pcard->pdev->dev, MKDEV(0, 0), kudev, "%s.%d.%d.%d", kudev->uioinfo.name, pcard->card_num, cte.type, kudev->core_num);
	if (IS_ERR(kudev->dev)) {
	dev_err(&pcard->pdev->dev, "%s: device_create failed!\n",
	__func__);
	kfree(kudev);
	return -ENODEV;
	}
	dev_set_drvdata(kudev->dev, kudev);

	rv = uio_register_device(kudev->dev, &kudev->uioinfo);
	if (rv) {
	dev_err(&pcard->pdev->dev, "%s: failed uio_register_device: %d\n",
	__func__, rv);
	put_device(kudev->dev);
	kfree(kudev);
	return rv;
	}

	list_add_tail(&kudev->list, &pcard->uio_devices_list);

	return 0;
	}

	static int create_dma_engine_core(struct kp2000_device *pcard, size_t engine_regs_offset, int engine_num, int irq_num)
	{
	struct mfd_cell cell = { .id = engine_num };
	struct resource resources[2];

	cell.platform_data = NULL;
	cell.pdata_size = 0;
	cell.name = KP_DRIVER_NAME_DMA_CONTROLLER;
	cell.num_resources = 2;

	memset(&resources, 0, sizeof(resources));

	resources[0].start = engine_regs_offset;
	resources[0].end = engine_regs_offset + (KPC_DMA_ENGINE_SIZE - 1);
	resources[0].flags = IORESOURCE_MEM;

	resources[1].start = irq_num;
	resources[1].end = irq_num;
	resources[1].flags = IORESOURCE_IRQ;

	cell.resources = resources;

	return mfd_add_devices(PCARD_TO_DEV(pcard), // parent
	pcard->card_num * 100, // id
	&cell, // struct mfd_cell *
	1, // ndevs
	&pcard->dma_base_resource,
	0, // irq_base
	NULL); // struct irq_domain *
	}

	static int kp2000_setup_dma_controller(struct kp2000_device *pcard)
	{
	int err;
	unsigned int i;
	u64 capabilities_reg;

	// S2C Engines
	for (i = 0 ; i < 32 ; i++) {
	capabilities_reg = readq(pcard->dma_bar_base + KPC_DMA_S2C_BASE_OFFSET + (KPC_DMA_ENGINE_SIZE * i));
	if (capabilities_reg & ENGINE_CAP_PRESENT_MASK) {
	err = create_dma_engine_core(pcard, (KPC_DMA_S2C_BASE_OFFSET + (KPC_DMA_ENGINE_SIZE * i)), i, pcard->pdev->irq);
	if (err)
	goto err_out;
	}
	}
	// C2S Engines
	for (i = 0 ; i < 32 ; i++) {
	capabilities_reg = readq(pcard->dma_bar_base + KPC_DMA_C2S_BASE_OFFSET + (KPC_DMA_ENGINE_SIZE * i));
	if (capabilities_reg & ENGINE_CAP_PRESENT_MASK) {
	err = create_dma_engine_core(pcard, (KPC_DMA_C2S_BASE_OFFSET + (KPC_DMA_ENGINE_SIZE * i)), 32 + i, pcard->pdev->irq);
	if (err)
	goto err_out;
	}
	}

	return 0;

	err_out:
	dev_err(&pcard->pdev->dev, "%s: failed to add a DMA Engine: %d\n",
	__func__, err);
	return err;
	}

	int kp2000_probe_cores(struct kp2000_device *pcard)
	{
	int err = 0;
	int i;
	int current_type_id;
	u64 read_val;
	unsigned int highest_core_id = 0;
	struct core_table_entry cte;

	err = kp2000_setup_dma_controller(pcard);
	if (err)
	return err;

	INIT_LIST_HEAD(&pcard->uio_devices_list);

	// First, iterate the core table looking for the highest CORE_ID
	for (i = 0 ; i < pcard->core_table_length ; i++) {
	read_val = readq(pcard->sysinfo_regs_base + ((pcard->core_table_offset + i) * 8));
	parse_core_table_entry(&cte, read_val, pcard->core_table_rev);
	dbg_cte(pcard, &cte);
	if (cte.type > highest_core_id)
	highest_core_id = cte.type;
	if (cte.type == KP_CORE_ID_INVALID)
	dev_info(&pcard->pdev->dev, "Found Invalid core: %016llx\n", read_val);
	}
	// Then, iterate over the possible core types.
	for (current_type_id = 1 ; current_type_id <= highest_core_id ; current_type_id++) {
	unsigned int core_num = 0;
	// Foreach core type, iterate the whole table and instantiate subdevices for each core.
	// Yes, this is O(n*m) but the actual runtime is small enough that it's an acceptable tradeoff.
	for (i = 0 ; i < pcard->core_table_length ; i++) {
	read_val = readq(pcard->sysinfo_regs_base + ((pcard->core_table_offset + i) * 8));
	parse_core_table_entry(&cte, read_val, pcard->core_table_rev);

	if (cte.type != current_type_id)
	continue;

	switch (cte.type) {
	case KP_CORE_ID_I2C:
	err = probe_core_basic(core_num, pcard,
	KP_DRIVER_NAME_I2C, cte);
	break;

	case KP_CORE_ID_SPI:
	err = probe_core_basic(core_num, pcard,
	KP_DRIVER_NAME_SPI, cte);
	break;

	default:
	err = probe_core_uio(core_num, pcard, "kpc_uio", cte);
	break;
	}
	if (err) {
	dev_err(&pcard->pdev->dev,
	"%s: failed to add core %d: %d\n",
	__func__, i, err);
	goto error;
	}
	core_num++;
	}
	}

	// Finally, instantiate a UIO device for the core_table.
	cte.type = 0; // CORE_ID_BOARD_INFO
	cte.offset = 0; // board info is always at the beginning
	cte.length = 512 * 8;
	cte.s2c_dma_present = false;
	cte.s2c_dma_channel_num = 0;
	cte.c2s_dma_present = false;
	cte.c2s_dma_channel_num = 0;
	cte.irq_count = 0;
	cte.irq_base_num = 0;
	err = probe_core_uio(0, pcard, "kpc_uio", cte);
	if (err) {
	dev_err(&pcard->pdev->dev, "%s: failed to add board_info core: %d\n",
	__func__, err);
	goto error;
	}

	return 0;

	error:
	kp2000_remove_cores(pcard);
	mfd_remove_devices(PCARD_TO_DEV(pcard));
	return err;
	}

	void kp2000_remove_cores(struct kp2000_device *pcard)
	{
	struct list_head *ptr;
	struct list_head *next;

	list_for_each_safe(ptr, next, &pcard->uio_devices_list) {
	struct kpc_uio_device *kudev = list_entry(ptr, struct kpc_uio_device, list);

	uio_unregister_device(&kudev->uioinfo);
	device_unregister(kudev->dev);
	list_del(&kudev->list);
	kfree(kudev);
	}
	}