diff options
Diffstat (limited to 'include/pci_ep.h')
| -rw-r--r-- | include/pci_ep.h | 414 |
1 files changed, 414 insertions, 0 deletions
diff --git a/include/pci_ep.h b/include/pci_ep.h new file mode 100644 index 0000000..00e8c6d --- /dev/null +++ b/include/pci_ep.h @@ -0,0 +1,414 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Adapted from Linux kernel driver + * Copyright (C) 2017 Texas Instruments + * Author: Kishon Vijay Abraham I <kishon@ti.com> + * + * (C) Copyright 2019 + * Ramon Fried <ramon.fried@gmail.com> + */ + +#ifndef _PCI_EP_H +#define _PCI_EP_H + +#include <pci.h> + +/** + * enum pci_interrupt_pin - PCI INTx interrupt values + * @PCI_INTERRUPT_UNKNOWN: Unknown or unassigned interrupt + * @PCI_INTERRUPT_INTA: PCI INTA pin + * @PCI_INTERRUPT_INTB: PCI INTB pin + * @PCI_INTERRUPT_INTC: PCI INTC pin + * @PCI_INTERRUPT_INTD: PCI INTD pin + * + * Corresponds to values for legacy PCI INTx interrupts, as can be found in the + * PCI_INTERRUPT_PIN register. + */ +enum pci_interrupt_pin { + PCI_INTERRUPT_UNKNOWN, + PCI_INTERRUPT_INTA, + PCI_INTERRUPT_INTB, + PCI_INTERRUPT_INTC, + PCI_INTERRUPT_INTD, +}; + +enum pci_barno { + BAR_0, + BAR_1, + BAR_2, + BAR_3, + BAR_4, + BAR_5, +}; + +enum pci_ep_irq_type { + PCI_EP_IRQ_UNKNOWN, + PCI_EP_IRQ_LEGACY, + PCI_EP_IRQ_MSI, + PCI_EP_IRQ_MSIX, +}; + +/** + * struct pci_bar - represents the BAR (Base Address Register) of EP device + * @phys_addr: physical address that should be mapped to the BAR + * @size: the size of the address space present in BAR + * pci_barno: number of pci BAR to set (0..5) + * @flags: BAR access flags + */ +struct pci_bar { + dma_addr_t phys_addr; + size_t size; + enum pci_barno barno; + int flags; +}; + +/** + * struct pci_ep_header - represents standard configuration header + * @vendorid: identifies device manufacturer + * @deviceid: identifies a particular device + * @revid: specifies a device-specific revision identifier + * @progif_code: identifies a specific register-level programming interface + * @subclass_code: identifies more specifically the function of the device + * @baseclass_code: broadly classifies the type of function the device performs + * @cache_line_size: specifies the system cacheline size in units of DWORDs + * @subsys_vendor_id: vendor of the add-in card or subsystem + * @subsys_id: id specific to vendor + * @interrupt_pin: interrupt pin the device (or device function) uses + */ +struct pci_ep_header { + u16 vendorid; + u16 deviceid; + u8 revid; + u8 progif_code; + u8 subclass_code; + u8 baseclass_code; + u8 cache_line_size; + u16 subsys_vendor_id; + u16 subsys_id; + enum pci_interrupt_pin interrupt_pin; +}; + +/* PCI endpoint operations */ +struct pci_ep_ops { + /** + * write_header() - Write a PCI configuration space header + * + * @dev: device to write to + * @func_num: EP function to fill + * @hdr: header to write + * @return 0 if OK, -ve on error + */ + int (*write_header)(struct udevice *dev, uint func_num, + struct pci_ep_header *hdr); + /** + * read_header() - Read a PCI configuration space header + * + * @dev: device to write to + * @func_num: EP function to fill + * @hdr: header to read to + * @return 0 if OK, -ve on error + */ + int (*read_header)(struct udevice *dev, uint func_num, + struct pci_ep_header *hdr); + /** + * set_bar() - Set BAR (Base Address Register) properties + * + * @dev: device to set + * @func_num: EP function to set + * @bar: bar data + * @return 0 if OK, -ve on error + */ + int (*set_bar)(struct udevice *dev, uint func_num, + struct pci_bar *bar); + /** + * read_bar() - Read BAR (Base Address Register) properties + * + * @dev: device to read + * @func_num: EP function to read + * @bar: struct to copy data to + * @barno: bar number to read + * @return 0 if OK, -ve on error + */ + int (*read_bar)(struct udevice *dev, uint func_num, + struct pci_bar *bar, enum pci_barno barno); + /** + * clear_bar() - clear BAR (Base Address Register) + * + * @dev: device to clear + * @func_num: EP function to clear + * @bar: bar number + * @return 0 if OK, -ve on error + */ + int (*clear_bar)(struct udevice *dev, uint func_num, + enum pci_barno bar); + /** + * map_addr() - map CPU address to PCI address + * + * outband region is used in order to generate PCI read/write + * transaction from local memory/write. + * + * @dev: device to set + * @func_num: EP function to set + * @addr: local physical address base + * @pci_addr: pci address to translate to + * @size: region size + * @return 0 if OK, -ve on error + */ + int (*map_addr)(struct udevice *dev, uint func_num, + phys_addr_t addr, u64 pci_addr, size_t size); + /** + * unmap_addr() - unmap CPU address to PCI address + * + * unmap previously mapped region. + * + * @dev: device to set + * @func_num: EP function to set + * @addr: local physical address base + * @return 0 if OK, -ve on error + */ + int (*unmap_addr)(struct udevice *dev, uint func_num, + phys_addr_t addr); + /** + * set_msi() - set msi capability property + * + * set the number of required MSI vectors the device + * needs for operation. + * + * @dev: device to set + * @func_num: EP function to set + * @interrupts: required interrupts count + * @return 0 if OK, -ve on error + */ + int (*set_msi)(struct udevice *dev, uint func_num, uint interrupts); + + /** + * get_msi() - get the number of MSI interrupts allocated by the host. + * + * Read the Multiple Message Enable bitfield from + * Message control register. + * + * @dev: device to use + * @func_num: EP function to use + * @return msi count if OK, -EINVAL if msi were not enabled at host. + */ + int (*get_msi)(struct udevice *dev, uint func_num); + + /** + * set_msix() - set msix capability property + * + * set the number of required MSIx vectors the device + * needs for operation. + * + * @dev: device to set + * @func_num: EP function to set + * @interrupts: required interrupts count + * @return 0 if OK, -ve on error + */ + int (*set_msix)(struct udevice *dev, uint func_num, + uint interrupts); + + /** + * get_msix() - get the number of MSIx interrupts allocated by the host. + * + * Read the Multiple Message Enable bitfield from + * Message control register. + * + * @dev: device to use + * @func_num: EP function to use + * @return msi count if OK, -EINVAL if msi were not enabled at host. + */ + int (*get_msix)(struct udevice *dev, uint func_num); + + /** + * raise_irq() - raise a legacy, MSI or MSI-X interrupt + * + * @dev: device to set + * @func_num: EP function to set + * @type: type of irq to send + * @interrupt_num: interrupt vector to use + * @return 0 if OK, -ve on error + */ + int (*raise_irq)(struct udevice *dev, uint func_num, + enum pci_ep_irq_type type, uint interrupt_num); + /** + * start() - start the PCI link + * + * @dev: device to set + * @return 0 if OK, -ve on error + */ + int (*start)(struct udevice *dev); + + /** + * stop() - stop the PCI link + * + * @dev: device to set + * @return 0 if OK, -ve on error + */ + int (*stop)(struct udevice *dev); +}; + +#define pci_ep_get_ops(dev) ((struct pci_ep_ops *)(dev)->driver->ops) + +/** + * pci_ep_write_header() - Write a PCI configuration space header + * + * @dev: device to write to + * @func_num: EP function to fill + * @hdr: header to write + * @return 0 if OK, -ve on error + */ +int pci_ep_write_header(struct udevice *dev, uint func_num, + struct pci_ep_header *hdr); + +/** + * dm_pci_ep_read_header() - Read a PCI configuration space header + * + * @dev: device to write to + * @func_num: EP function to fill + * @hdr: header to read to + * @return 0 if OK, -ve on error + */ +int pci_ep_read_header(struct udevice *dev, uint func_num, + struct pci_ep_header *hdr); +/** + * pci_ep_set_bar() - Set BAR (Base Address Register) properties + * + * @dev: device to set + * @func_num: EP function to set + * @bar: bar data + * @return 0 if OK, -ve on error + */ +int pci_ep_set_bar(struct udevice *dev, uint func_num, struct pci_bar *bar); + +/** + * pci_ep_read_bar() - Read BAR (Base Address Register) properties + * + * @dev: device to read + * @func_num: EP function to read + * @bar: struct to copy data to + * @barno: bar number to read + * @return 0 if OK, -ve on error + */ +int pci_ep_read_bar(struct udevice *dev, uint func_no, struct pci_bar *ep_bar, + enum pci_barno barno); + +/** + * pci_ep_clear_bar() - Clear BAR (Base Address Register) + * mark the BAR as empty so host won't map it. + * @dev: device to clear + * @func_num: EP function to clear + * @bar: bar number + * @return 0 if OK, -ve on error + */ +int pci_ep_clear_bar(struct udevice *dev, uint func_num, enum pci_barno bar); +/** + * pci_ep_map_addr() - map CPU address to PCI address + * + * outband region is used in order to generate PCI read/write + * transaction from local memory/write. + * + * @dev: device to set + * @func_num: EP function to set + * @addr: local physical address base + * @pci_addr: pci address to translate to + * @size: region size + * @return 0 if OK, -ve on error + */ +int pci_ep_map_addr(struct udevice *dev, uint func_num, phys_addr_t addr, + u64 pci_addr, size_t size); +/** + * pci_ep_unmap_addr() - unmap CPU address to PCI address + * + * unmap previously mapped region. + * + * @dev: device to set + * @func_num: EP function to set + * @addr: local physical address base + * @return 0 if OK, -ve on error + */ +int pci_ep_unmap_addr(struct udevice *dev, uint func_num, phys_addr_t addr); + +/** + * pci_ep_set_msi() - set msi capability property + * + * set the number of required MSI vectors the device + * needs for operation. + * + * @dev: device to set + * @func_num: EP function to set + * @interrupts: required interrupts count + * @return 0 if OK, -ve on error + */ +int pci_ep_set_msi(struct udevice *dev, uint func_num, uint interrupts); + +/** + * pci_ep_get_msi() - get the number of MSI interrupts allocated by the host. + * + * Read the Multiple Message Enable bitfield from + * Message control register. + * + * @dev: device to use + * @func_num: EP function to use + * @return msi count if OK, -EINVAL if msi were not enabled at host. + */ +int pci_ep_get_msi(struct udevice *dev, uint func_num); + +/** + * pci_ep_set_msix() - set msi capability property + * + * set the number of required MSIx vectors the device + * needs for operation. + * + * @dev: device to set + * @func_num: EP function to set + * @interrupts: required interrupts count + * @return 0 if OK, -ve on error + */ +int pci_ep_set_msix(struct udevice *dev, uint func_num, uint interrupts); + +/** + * pci_ep_get_msix() - get the number of MSIx interrupts allocated by the host. + * + * Read the Multiple Message Enable bitfield from + * Message control register. + * + * @dev: device to use + * @func_num: EP function to use + * @return msi count if OK, -EINVAL if msi were not enabled at host. + */ +int pci_ep_get_msix(struct udevice *dev, uint func_num); + +/** + * pci_ep_raise_irq() - raise a legacy, MSI or MSI-X interrupt + * + * @dev: device to set + * @func_num: EP function to set + * @type: type of irq to send + * @interrupt_num: interrupt vector to use + * @return 0 if OK, -ve on error + */ +int pci_ep_raise_irq(struct udevice *dev, uint func_num, + enum pci_ep_irq_type type, uint interrupt_num); +/** + * pci_ep_start() - start the PCI link + * + * Enable PCI endpoint device and start link + * process. + * + * @dev: device to set + * @return 0 if OK, -ve on error + */ +int pci_ep_start(struct udevice *dev); + +/** + * pci_ep_stop() - stop the PCI link + * + * Disable PCI endpoint device and stop + * link. + * + * @dev: device to set + * @return 0 if OK, -ve on error + */ +int pci_ep_stop(struct udevice *dev); + +#endif |