Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * arch/xtensa/kernel/pci.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * PCI bios-type initialisation for PCI machines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Copyright (C) 2001-2005 Tensilica Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * Based largely on work from Cort (ppc/kernel/pci.c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * IO functions copied from sparc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * Chris Zankel <chris@zankel.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <asm/pci-bridge.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <asm/platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)  * We need to avoid collisions with `mirrored' VGA ports
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)  * and other strange ISA hardware, so we always want the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)  * addresses to be allocated in the 0x000-0x0ff region
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)  * modulo 0x400.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)  * Why? Because some silly external IO cards only decode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)  * the low 10 bits of the IO address. The 0x00-0xff region
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)  * is reserved for motherboard devices that decode all 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)  * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)  * but we want to try to avoid allocating at 0x2900-0x2bff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)  * which might have be mirrored at 0x0100-0x03ff..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) resource_size_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) pcibios_align_resource(void *data, const struct resource *res,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		       resource_size_t size, resource_size_t align)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	struct pci_dev *dev = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	resource_size_t start = res->start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	if (res->flags & IORESOURCE_IO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		if (size > 0x100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 			pr_err("PCI: I/O Region %s/%d too large (%u bytes)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 					pci_name(dev), dev->resource - res,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 					size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		if (start & 0x300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 			start = (start + 0x3ff) & ~0x3ff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	return start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) void pcibios_fixup_bus(struct pci_bus *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	if (bus->parent) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 		/* This is a subordinate bridge */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 		pci_read_bridge_bases(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)  * Platform support for /proc/bus/pci/X/Y mmap()s.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)  *  -- paulus.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	struct pci_controller *pci_ctrl = (struct pci_controller*) pdev->sysdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	resource_size_t ioaddr = pci_resource_start(pdev, bar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	if (pci_ctrl == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 		return -EINVAL;		/* should never happen */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 	/* Convert to an offset within this PCI controller */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 	ioaddr -= (unsigned long)pci_ctrl->io_space.base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 	vma->vm_pgoff += (ioaddr + pci_ctrl->io_space.start) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }