xref: /openbmc/u-boot/arch/x86/cpu/queensbay/tnc.c (revision 9ee16897)
1 /*
2  * Copyright (C) 2014, Bin Meng <bmeng.cn@gmail.com>
3  *
4  * SPDX-License-Identifier:	GPL-2.0+
5  */
6 
7 #include <common.h>
8 #include <asm/io.h>
9 #include <asm/irq.h>
10 #include <asm/pci.h>
11 #include <asm/post.h>
12 #include <asm/arch/device.h>
13 #include <asm/arch/tnc.h>
14 #include <asm/fsp/fsp_support.h>
15 #include <asm/processor.h>
16 
17 static void unprotect_spi_flash(void)
18 {
19 	u32 bc;
20 
21 	bc = x86_pci_read_config32(TNC_LPC, 0xd8);
22 	bc |= 0x1;	/* unprotect the flash */
23 	x86_pci_write_config32(TNC_LPC, 0xd8, bc);
24 }
25 
26 int arch_cpu_init(void)
27 {
28 	int ret;
29 
30 	post_code(POST_CPU_INIT);
31 #ifdef CONFIG_SYS_X86_TSC_TIMER
32 	timer_set_base(rdtsc());
33 #endif
34 
35 	ret = x86_cpu_init_f();
36 	if (ret)
37 		return ret;
38 
39 	return 0;
40 }
41 
42 void cpu_irq_init(void)
43 {
44 	struct tnc_rcba *rcba;
45 	u32 base;
46 
47 	base = x86_pci_read_config32(TNC_LPC, LPC_RCBA);
48 	base &= ~MEM_BAR_EN;
49 	rcba = (struct tnc_rcba *)base;
50 
51 	/* Make sure all internal PCI devices are using INTA */
52 	writel(INTA, &rcba->d02ip);
53 	writel(INTA, &rcba->d03ip);
54 	writel(INTA, &rcba->d27ip);
55 	writel(INTA, &rcba->d31ip);
56 	writel(INTA, &rcba->d23ip);
57 	writel(INTA, &rcba->d24ip);
58 	writel(INTA, &rcba->d25ip);
59 	writel(INTA, &rcba->d26ip);
60 
61 	/*
62 	 * Route TunnelCreek PCI device interrupt pin to PIRQ
63 	 *
64 	 * Since PCIe downstream ports received INTx are routed to PIRQ
65 	 * A/B/C/D directly and not configurable, we have to route PCIe
66 	 * root ports' INTx to PIRQ A/B/C/D as well. For other devices
67 	 * on TunneCreek, route them to PIRQ E/F/G/H.
68 	 */
69 	writew(PIRQE, &rcba->d02ir);
70 	writew(PIRQF, &rcba->d03ir);
71 	writew(PIRQG, &rcba->d27ir);
72 	writew(PIRQH, &rcba->d31ir);
73 	writew(PIRQA, &rcba->d23ir);
74 	writew(PIRQB, &rcba->d24ir);
75 	writew(PIRQC, &rcba->d25ir);
76 	writew(PIRQD, &rcba->d26ir);
77 }
78 
79 int arch_misc_init(void)
80 {
81 	unprotect_spi_flash();
82 
83 	return pirq_init();
84 }
85