^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * PCI Endpoint *Controller* Address Space Management
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2017 Texas Instruments
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author: Kishon Vijay Abraham I <kishon@ti.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/pci-epc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * pci_epc_mem_get_order() - determine the allocation order of a memory size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * @mem: address space of the endpoint controller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * @size: the size for which to get the order
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * Reimplement get_order() for mem->page_size since the generic get_order
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * always gets order with a constant PAGE_SIZE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static int pci_epc_mem_get_order(struct pci_epc_mem *mem, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) int order;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) unsigned int page_shift = ilog2(mem->window.page_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) size--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) size >>= page_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #if BITS_PER_LONG == 32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) order = fls(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) order = fls64(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) return order;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * pci_epc_multi_mem_init() - initialize the pci_epc_mem structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * @epc: the EPC device that invoked pci_epc_mem_init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * @windows: pointer to windows supported by the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * @num_windows: number of windows device supports
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * Invoke to initialize the pci_epc_mem structure used by the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * endpoint functions to allocate mapped PCI address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int pci_epc_multi_mem_init(struct pci_epc *epc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct pci_epc_mem_window *windows,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) unsigned int num_windows)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct pci_epc_mem *mem = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) unsigned long *bitmap = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) unsigned int page_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) size_t page_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) int bitmap_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) int pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) epc->num_windows = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (!windows || !num_windows)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) epc->windows = kcalloc(num_windows, sizeof(*epc->windows), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (!epc->windows)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) for (i = 0; i < num_windows; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) page_size = windows[i].page_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (page_size < PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) page_size = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) page_shift = ilog2(page_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) pages = windows[i].size >> page_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) mem = kzalloc(sizeof(*mem), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (!mem) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) i--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) goto err_mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) bitmap = kzalloc(bitmap_size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (!bitmap) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) kfree(mem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) i--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) goto err_mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) mem->window.phys_base = windows[i].phys_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) mem->window.size = windows[i].size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) mem->window.page_size = page_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) mem->bitmap = bitmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) mem->pages = pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) mutex_init(&mem->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) epc->windows[i] = mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) epc->mem = epc->windows[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) epc->num_windows = num_windows;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) err_mem:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) for (; i >= 0; i--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) mem = epc->windows[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) kfree(mem->bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) kfree(mem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) kfree(epc->windows);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) EXPORT_SYMBOL_GPL(pci_epc_multi_mem_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t base,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) size_t size, size_t page_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) struct pci_epc_mem_window mem_window;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) mem_window.phys_base = base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) mem_window.size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) mem_window.page_size = page_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return pci_epc_multi_mem_init(epc, &mem_window, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) EXPORT_SYMBOL_GPL(pci_epc_mem_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * pci_epc_mem_exit() - cleanup the pci_epc_mem structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) * @epc: the EPC device that invoked pci_epc_mem_exit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) * Invoke to cleanup the pci_epc_mem structure allocated in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) * pci_epc_mem_init().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) void pci_epc_mem_exit(struct pci_epc *epc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) struct pci_epc_mem *mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (!epc->num_windows)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) for (i = 0; i < epc->num_windows; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) mem = epc->windows[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) kfree(mem->bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) kfree(mem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) kfree(epc->windows);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) epc->windows = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) epc->mem = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) epc->num_windows = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) EXPORT_SYMBOL_GPL(pci_epc_mem_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * pci_epc_mem_alloc_addr() - allocate memory address from EPC addr space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) * @epc: the EPC device on which memory has to be allocated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) * @phys_addr: populate the allocated physical address here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * @size: the size of the address space that has to be allocated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * Invoke to allocate memory address from the EPC address space. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * is usually done to map the remote RC address into the local system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) phys_addr_t *phys_addr, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) void __iomem *virt_addr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) struct pci_epc_mem *mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) unsigned int page_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) size_t align_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) int pageno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) int order;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) for (i = 0; i < epc->num_windows; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) mem = epc->windows[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) mutex_lock(&mem->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) align_size = ALIGN(size, mem->window.page_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) order = pci_epc_mem_get_order(mem, align_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) pageno = bitmap_find_free_region(mem->bitmap, mem->pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) order);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (pageno >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) page_shift = ilog2(mem->window.page_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) *phys_addr = mem->window.phys_base +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) ((phys_addr_t)pageno << page_shift);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) virt_addr = ioremap(*phys_addr, align_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) if (!virt_addr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) bitmap_release_region(mem->bitmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) pageno, order);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) mutex_unlock(&mem->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) mutex_unlock(&mem->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) return virt_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) mutex_unlock(&mem->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) return virt_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) EXPORT_SYMBOL_GPL(pci_epc_mem_alloc_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) static struct pci_epc_mem *pci_epc_get_matching_window(struct pci_epc *epc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) phys_addr_t phys_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) struct pci_epc_mem *mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) for (i = 0; i < epc->num_windows; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) mem = epc->windows[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) if (phys_addr >= mem->window.phys_base &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) phys_addr < (mem->window.phys_base + mem->window.size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) return mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) * pci_epc_mem_free_addr() - free the allocated memory address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) * @epc: the EPC device on which memory was allocated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) * @phys_addr: the allocated physical address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) * @virt_addr: virtual address of the allocated mem space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) * @size: the size of the allocated address space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) * Invoke to free the memory allocated using pci_epc_mem_alloc_addr.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) void __iomem *virt_addr, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) struct pci_epc_mem *mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) unsigned int page_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) size_t page_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) int pageno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) int order;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) mem = pci_epc_get_matching_window(epc, phys_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) if (!mem) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) pr_err("failed to get matching window\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) page_size = mem->window.page_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) page_shift = ilog2(page_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) iounmap(virt_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) pageno = (phys_addr - mem->window.phys_base) >> page_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) size = ALIGN(size, page_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) order = pci_epc_mem_get_order(mem, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) mutex_lock(&mem->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) bitmap_release_region(mem->bitmap, pageno, order);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) mutex_unlock(&mem->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) EXPORT_SYMBOL_GPL(pci_epc_mem_free_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) MODULE_DESCRIPTION("PCI EPC Address Space Management");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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