^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2010 John Crispin <john@phrozen.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/mtd/mtd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/mtd/map.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/mtd/partitions.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mtd/cfi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/mtd/physmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <lantiq_soc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * The NOR flash is connected to the same external bus unit (EBU) as PCI.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * To make PCI work we need to enable the endianness swapping for the address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * written to the EBU. This endianness swapping works for PCI correctly but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * fails for attached NOR devices. To workaround this we need to use a complex
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * map. The workaround involves swapping all addresses whilst probing the chip.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * Once probing is complete we stop swapping the addresses but swizzle the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * unlock addresses to ensure that access to the NOR device works correctly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) LTQ_NOR_PROBING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) LTQ_NOR_NORMAL
^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) struct ltq_mtd {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct resource *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct mtd_info *mtd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct map_info *map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) static const char ltq_map_name[] = "ltq_nor";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static map_word
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) ltq_read16(struct map_info *map, unsigned long adr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) map_word temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) if (map->map_priv_1 == LTQ_NOR_PROBING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) adr ^= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) spin_lock_irqsave(&ebu_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) temp.x[0] = *(u16 *)(map->virt + adr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) spin_unlock_irqrestore(&ebu_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return temp;
^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) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) ltq_write16(struct map_info *map, map_word d, unsigned long adr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (map->map_priv_1 == LTQ_NOR_PROBING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) adr ^= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) spin_lock_irqsave(&ebu_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) *(u16 *)(map->virt + adr) = d.x[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) spin_unlock_irqrestore(&ebu_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^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) * The following 2 functions copy data between iomem and a cached memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * section. As memcpy() makes use of pre-fetching we cannot use it here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * The normal alternative of using memcpy_{to,from}io also makes use of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * memcpy() on MIPS so it is not applicable either. We are therefore stuck
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * with having to use our own loop.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) ltq_copy_from(struct map_info *map, void *to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) unsigned long from, ssize_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) unsigned char *f = (unsigned char *)map->virt + from;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) unsigned char *t = (unsigned char *)to;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) spin_lock_irqsave(&ebu_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) while (len--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) *t++ = *f++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) spin_unlock_irqrestore(&ebu_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) ltq_copy_to(struct map_info *map, unsigned long to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) const void *from, ssize_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) unsigned char *f = (unsigned char *)from;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) unsigned char *t = (unsigned char *)map->virt + to;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) spin_lock_irqsave(&ebu_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) while (len--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) *t++ = *f++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) spin_unlock_irqrestore(&ebu_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) ltq_mtd_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) struct ltq_mtd *ltq_mtd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct cfi_private *cfi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) ltq_mtd = devm_kzalloc(&pdev->dev, sizeof(struct ltq_mtd), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (!ltq_mtd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) platform_set_drvdata(pdev, ltq_mtd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) ltq_mtd->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (!ltq_mtd->res) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) dev_err(&pdev->dev, "failed to get memory resource\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) ltq_mtd->map = devm_kzalloc(&pdev->dev, sizeof(struct map_info),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) if (!ltq_mtd->map)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) ltq_mtd->map->phys = ltq_mtd->res->start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) ltq_mtd->map->size = resource_size(ltq_mtd->res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) ltq_mtd->map->virt = devm_ioremap_resource(&pdev->dev, ltq_mtd->res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (IS_ERR(ltq_mtd->map->virt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return PTR_ERR(ltq_mtd->map->virt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) ltq_mtd->map->name = ltq_map_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) ltq_mtd->map->bankwidth = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) ltq_mtd->map->read = ltq_read16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) ltq_mtd->map->write = ltq_write16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) ltq_mtd->map->copy_from = ltq_copy_from;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) ltq_mtd->map->copy_to = ltq_copy_to;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) ltq_mtd->map->map_priv_1 = LTQ_NOR_PROBING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) ltq_mtd->mtd = do_map_probe("cfi_probe", ltq_mtd->map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) ltq_mtd->map->map_priv_1 = LTQ_NOR_NORMAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (!ltq_mtd->mtd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) dev_err(&pdev->dev, "probing failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) ltq_mtd->mtd->dev.parent = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) mtd_set_of_node(ltq_mtd->mtd, pdev->dev.of_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) cfi = ltq_mtd->map->fldrv_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) cfi->addr_unlock1 ^= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) cfi->addr_unlock2 ^= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) err = mtd_device_register(ltq_mtd->mtd, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) dev_err(&pdev->dev, "failed to add partitions\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) goto err_destroy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) err_destroy:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) map_destroy(ltq_mtd->mtd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) ltq_mtd_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) struct ltq_mtd *ltq_mtd = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) if (ltq_mtd && ltq_mtd->mtd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) mtd_device_unregister(ltq_mtd->mtd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) map_destroy(ltq_mtd->mtd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) static const struct of_device_id ltq_mtd_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) { .compatible = "lantiq,nor" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) MODULE_DEVICE_TABLE(of, ltq_mtd_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static struct platform_driver ltq_mtd_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) .probe = ltq_mtd_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) .remove = ltq_mtd_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) .name = "ltq-nor",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) .of_match_table = ltq_mtd_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) module_platform_driver(ltq_mtd_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) MODULE_AUTHOR("John Crispin <john@phrozen.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) MODULE_DESCRIPTION("Lantiq SoC NOR");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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