| Thomas Gleixner | 82c73e0 | 2019-06-03 07:44:59 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| Thomas Gleixner | f7eaf6e | 2017-08-28 08:47:20 +0200 | [diff] [blame] | 2 | /* |
| 3 | * EISA specific code |
| Thomas Gleixner | f7eaf6e | 2017-08-28 08:47:20 +0200 | [diff] [blame] | 4 | */ |
| 5 | #include <linux/ioport.h> |
| 6 | #include <linux/eisa.h> |
| Thomas Gleixner | ef1d4de | 2017-08-31 20:08:16 +0200 | [diff] [blame] | 7 | #include <linux/io.h> |
| Thomas Gleixner | f7eaf6e | 2017-08-28 08:47:20 +0200 | [diff] [blame] | 8 | |
| Boris Ostrovsky | 6a92b11 | 2018-09-11 15:55:38 -0400 | [diff] [blame] | 9 | #include <xen/xen.h> |
| 10 | |
| Thomas Gleixner | f7eaf6e | 2017-08-28 08:47:20 +0200 | [diff] [blame] | 11 | static __init int eisa_bus_probe(void) |
| 12 | { |
| Boris Ostrovsky | 6a92b11 | 2018-09-11 15:55:38 -0400 | [diff] [blame] | 13 | void __iomem *p; |
| Thomas Gleixner | f7eaf6e | 2017-08-28 08:47:20 +0200 | [diff] [blame] | 14 | |
| Boris Ostrovsky | 6a92b11 | 2018-09-11 15:55:38 -0400 | [diff] [blame] | 15 | if (xen_pv_domain() && !xen_initial_domain()) |
| 16 | return 0; |
| 17 | |
| 18 | p = ioremap(0x0FFFD9, 4); |
| 19 | if (p && readl(p) == 'E' + ('I' << 8) + ('S' << 16) + ('A' << 24)) |
| Thomas Gleixner | f7eaf6e | 2017-08-28 08:47:20 +0200 | [diff] [blame] | 20 | EISA_bus = 1; |
| 21 | iounmap(p); |
| 22 | return 0; |
| 23 | } |
| 24 | subsys_initcall(eisa_bus_probe); |