1// SPDX-License-Identifier: GPL-2.0+
 2
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 3#include <linux/types.h>
 4#include <linux/dma-map-ops.h>
 5#include <asm/bmips.h>
 6#include <asm/io.h>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 7
 8bool bmips_rac_flush_disable;
 
 
 
 
 
 
 
 
 9
10void arch_sync_dma_for_cpu_all(void)
11{
12	void __iomem *cbr = BMIPS_GET_CBR();
13	u32 cfg;
 
 
 
 
 
 
 
14
15	if (boot_cpu_type() != CPU_BMIPS3300 &&
16	    boot_cpu_type() != CPU_BMIPS4350 &&
17	    boot_cpu_type() != CPU_BMIPS4380)
18		return;
19
20	if (unlikely(bmips_rac_flush_disable))
21		return;
22
23	/* Flush stale data out of the readahead cache */
24	cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
25	__raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG);
26	__raw_readl(cbr + BMIPS_RAC_CONFIG);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
27}

  1/*
  2 * This file is subject to the terms and conditions of the GNU General Public
  3 * License.  See the file "COPYING" in the main directory of this archive
  4 * for more details.
  5 *
  6 * Copyright (C) 2014 Kevin Cernekee <cernekee@gmail.com>
  7 */
  8
  9#define pr_fmt(fmt)		"bmips-dma: " fmt
 10
 11#include <linux/device.h>
 12#include <linux/dma-direction.h>
 13#include <linux/dma-mapping.h>
 14#include <linux/init.h>
 15#include <linux/io.h>
 16#include <linux/of.h>
 17#include <linux/printk.h>
 18#include <linux/slab.h>
 19#include <linux/types.h>
 20#include <dma-coherence.h>
 21
 22/*
 23 * BCM338x has configurable address translation windows which allow the
 24 * peripherals' DMA addresses to be different from the Zephyr-visible
 25 * physical addresses.  e.g. usb_dma_addr = zephyr_pa ^ 0x08000000
 26 *
 27 * If the "brcm,ubus" node has a "dma-ranges" property we will enable this
 28 * translation globally using the provided information.  This implements a
 29 * very limited subset of "dma-ranges" support and it will probably be
 30 * replaced by a more generic version later.
 31 */
 32
 33struct bmips_dma_range {
 34	u32			child_addr;
 35	u32			parent_addr;
 36	u32			size;
 37};
 38
 39static struct bmips_dma_range *bmips_dma_ranges;
 40
 41#define FLUSH_RAC		0x100
 42
 43static dma_addr_t bmips_phys_to_dma(struct device *dev, phys_addr_t pa)
 44{
 45	struct bmips_dma_range *r;
 46
 47	for (r = bmips_dma_ranges; r && r->size; r++) {
 48		if (pa >= r->child_addr &&
 49		    pa < (r->child_addr + r->size))
 50			return pa - r->child_addr + r->parent_addr;
 51	}
 52	return pa;
 53}
 54
 55dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size)
 56{
 57	return bmips_phys_to_dma(dev, virt_to_phys(addr));
 58}
 59
 60dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page)
 61{
 62	return bmips_phys_to_dma(dev, page_to_phys(page));
 63}
 64
 65unsigned long plat_dma_addr_to_phys(struct device *dev, dma_addr_t dma_addr)
 66{
 67	struct bmips_dma_range *r;
 68
 69	for (r = bmips_dma_ranges; r && r->size; r++) {
 70		if (dma_addr >= r->parent_addr &&
 71		    dma_addr < (r->parent_addr + r->size))
 72			return dma_addr - r->parent_addr + r->child_addr;
 73	}
 74	return dma_addr;
 75}
 76
 77static int __init bmips_init_dma_ranges(void)
 78{
 79	struct device_node *np =
 80		of_find_compatible_node(NULL, NULL, "brcm,ubus");
 81	const __be32 *data;
 82	struct bmips_dma_range *r;
 83	int len;
 84
 85	if (!np)
 86		return 0;
 87
 88	data = of_get_property(np, "dma-ranges", &len);
 89	if (!data)
 90		goto out_good;
 91
 92	len /= sizeof(*data) * 3;
 93	if (!len)
 94		goto out_bad;
 95
 96	/* add a dummy (zero) entry at the end as a sentinel */
 97	bmips_dma_ranges = kzalloc(sizeof(struct bmips_dma_range) * (len + 1),
 98				   GFP_KERNEL);
 99	if (!bmips_dma_ranges)
100		goto out_bad;
101
102	for (r = bmips_dma_ranges; len; len--, r++) {
103		r->child_addr = be32_to_cpup(data++);
104		r->parent_addr = be32_to_cpup(data++);
105		r->size = be32_to_cpup(data++);
106	}
107
108out_good:
109	of_node_put(np);
110	return 0;
111
112out_bad:
113	pr_err("error parsing dma-ranges property\n");
114	of_node_put(np);
115	return -EINVAL;
116}
117arch_initcall(bmips_init_dma_ranges);