^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * License. See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2014 Kevin Cernekee <cernekee@gmail.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) #define pr_fmt(fmt) "bmips-dma: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/dma-direction.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/dma-mapping.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/printk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/bmips.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * BCM338x has configurable address translation windows which allow the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * peripherals' DMA addresses to be different from the Zephyr-visible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * physical addresses. e.g. usb_dma_addr = zephyr_pa ^ 0x08000000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * If the "brcm,ubus" node has a "dma-ranges" property we will enable this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * translation globally using the provided information. This implements a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * very limited subset of "dma-ranges" support and it will probably be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * replaced by a more generic version later.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct bmips_dma_range {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) u32 child_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) u32 parent_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) u32 size;
^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) static struct bmips_dma_range *bmips_dma_ranges;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define FLUSH_RAC 0x100
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) dma_addr_t phys_to_dma(struct device *dev, phys_addr_t pa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct bmips_dma_range *r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) for (r = bmips_dma_ranges; r && r->size; r++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) if (pa >= r->child_addr &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) pa < (r->child_addr + r->size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) return pa - r->child_addr + r->parent_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return pa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct bmips_dma_range *r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) for (r = bmips_dma_ranges; r && r->size; r++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (dma_addr >= r->parent_addr &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) dma_addr < (r->parent_addr + r->size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return dma_addr - r->parent_addr + r->child_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) return dma_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) void arch_sync_dma_for_cpu_all(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) void __iomem *cbr = BMIPS_GET_CBR();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) u32 cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (boot_cpu_type() != CPU_BMIPS3300 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) boot_cpu_type() != CPU_BMIPS4350 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) boot_cpu_type() != CPU_BMIPS4380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) /* Flush stale data out of the readahead cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) __raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) __raw_readl(cbr + BMIPS_RAC_CONFIG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static int __init bmips_init_dma_ranges(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct device_node *np =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) of_find_compatible_node(NULL, NULL, "brcm,ubus");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) const __be32 *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) struct bmips_dma_range *r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (!np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) data = of_get_property(np, "dma-ranges", &len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) goto out_good;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) len /= sizeof(*data) * 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (!len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) goto out_bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /* add a dummy (zero) entry at the end as a sentinel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) bmips_dma_ranges = kcalloc(len + 1, sizeof(struct bmips_dma_range),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (!bmips_dma_ranges)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) goto out_bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) for (r = bmips_dma_ranges; len; len--, r++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) r->child_addr = be32_to_cpup(data++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) r->parent_addr = be32_to_cpup(data++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) r->size = be32_to_cpup(data++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) out_good:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) of_node_put(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) out_bad:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) pr_err("error parsing dma-ranges property\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) of_node_put(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) arch_initcall(bmips_init_dma_ranges);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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