1 /*
2  * Broadcom BCM470X / BCM5301X ARM platform code.
3  *
4  * Copyright 2013 Hauke Mehrtens <hauke@hauke-m.de>
5  *
6  * Licensed under the GNU/GPL. See COPYING for details.
7  */
8 #include <linux/of_platform.h>
9 #include <asm/hardware/cache-l2x0.h>
10 
11 #include <asm/mach/arch.h>
12 #include <asm/siginfo.h>
13 #include <asm/signal.h>
14 
15 #define FSR_EXTERNAL		(1 << 12)
16 #define FSR_READ		(0 << 10)
17 #define FSR_IMPRECISE		0x0406
18 
19 static const char *const bcm5301x_dt_compat[] __initconst = {
20 	"brcm,bcm4708",
21 	NULL,
22 };
23 
bcm5301x_abort_handler(unsigned long addr,unsigned int fsr,struct pt_regs * regs)24 static int bcm5301x_abort_handler(unsigned long addr, unsigned int fsr,
25 				  struct pt_regs *regs)
26 {
27 	/*
28 	 * We want to ignore aborts forwarded from the PCIe bus that are
29 	 * expected and shouldn't really be passed by the PCIe controller.
30 	 * The biggest disadvantage is the same FSR code may be reported when
31 	 * reading non-existing APB register and we shouldn't ignore that.
32 	 */
33 	if (fsr == (FSR_EXTERNAL | FSR_READ | FSR_IMPRECISE))
34 		return 0;
35 
36 	return 1;
37 }
38 
bcm5301x_init_early(void)39 static void __init bcm5301x_init_early(void)
40 {
41 	hook_fault_code(16 + 6, bcm5301x_abort_handler, SIGBUS, BUS_OBJERR,
42 			"imprecise external abort");
43 }
44 
45 DT_MACHINE_START(BCM5301X, "BCM5301X")
46 	.l2c_aux_val	= 0,
47 	.l2c_aux_mask	= ~0,
48 	.dt_compat	= bcm5301x_dt_compat,
49 	.init_early	= bcm5301x_init_early,
50 MACHINE_END
51