| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | #undef DEBUG |
| 3 | |
| 4 | #include <linux/kernel.h> |
| 5 | #include <linux/string.h> |
| 6 | #include <linux/ioport.h> |
| 7 | #include <linux/etherdevice.h> |
| 8 | #include <linux/of_address.h> |
| 9 | #include <asm/prom.h> |
| 10 | |
| 11 | void of_parse_dma_window(struct device_node *dn, const __be32 *dma_window, |
| 12 | unsigned long *busno, unsigned long *phys, |
| 13 | unsigned long *size) |
| 14 | { |
| 15 | u32 cells; |
| 16 | const __be32 *prop; |
| 17 | |
| 18 | /* busno is always one cell */ |
| 19 | *busno = of_read_number(dma_window, 1); |
| 20 | dma_window++; |
| 21 | |
| 22 | prop = of_get_property(dn, "ibm,#dma-address-cells", NULL); |
| 23 | if (!prop) |
| 24 | prop = of_get_property(dn, "#address-cells", NULL); |
| 25 | |
| 26 | cells = prop ? of_read_number(prop, 1) : of_n_addr_cells(dn); |
| 27 | *phys = of_read_number(dma_window, cells); |
| 28 | |
| 29 | dma_window += cells; |
| 30 | |
| 31 | prop = of_get_property(dn, "ibm,#dma-size-cells", NULL); |
| 32 | cells = prop ? of_read_number(prop, 1) : of_n_size_cells(dn); |
| 33 | *size = of_read_number(dma_window, cells); |
| 34 | } |