1/*
2 * Based on linux/arch/mips/txx9/rbtx4938/setup.c,
3 *	    and RBTX49xx patch from CELF patch archive.
4 *
5 * Copyright 2001, 2003-2005 MontaVista Software Inc.
6 * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
7 * (C) Copyright TOSHIBA CORPORATION 2000-2001, 2004-2007
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License.  See the file "COPYING" in the main directory of this archive
11 * for more details.
12 */
13#include <linux/init.h>
14#include <linux/pci.h>
15#include <linux/kernel.h>
16#include <linux/interrupt.h>
17#include <asm/txx9/generic.h>
18#include <asm/txx9/tx4927.h>
19
20int __init tx4927_report_pciclk(void)
21{
22	int pciclk = 0;
23
24	pr_info("PCIC --%s PCICLK:",
25		(__raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_PCI66) ?
26		" PCI66" : "");
27	if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) {
28		u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg);
29		switch ((unsigned long)ccfg &
30			TX4927_CCFG_PCIDIVMODE_MASK) {
31		case TX4927_CCFG_PCIDIVMODE_2_5:
32			pciclk = txx9_cpu_clock * 2 / 5; break;
33		case TX4927_CCFG_PCIDIVMODE_3:
34			pciclk = txx9_cpu_clock / 3; break;
35		case TX4927_CCFG_PCIDIVMODE_5:
36			pciclk = txx9_cpu_clock / 5; break;
37		case TX4927_CCFG_PCIDIVMODE_6:
38			pciclk = txx9_cpu_clock / 6; break;
39		}
40		pr_cont("Internal(%u.%uMHz)",
41			(pciclk + 50000) / 1000000,
42			((pciclk + 50000) / 100000) % 10);
43	} else {
44		pr_cont("External");
45		pciclk = -1;
46	}
47	pr_cont("\n");
48	return pciclk;
49}
50
51int __init tx4927_pciclk66_setup(void)
52{
53	int pciclk;
54
55	/* Assert M66EN */
56	tx4927_ccfg_set(TX4927_CCFG_PCI66);
57	/* Double PCICLK (if possible) */
58	if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) {
59		unsigned int pcidivmode = 0;
60		u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg);
61		pcidivmode = (unsigned long)ccfg &
62			TX4927_CCFG_PCIDIVMODE_MASK;
63		switch (pcidivmode) {
64		case TX4927_CCFG_PCIDIVMODE_5:
65		case TX4927_CCFG_PCIDIVMODE_2_5:
66			pcidivmode = TX4927_CCFG_PCIDIVMODE_2_5;
67			pciclk = txx9_cpu_clock * 2 / 5;
68			break;
69		case TX4927_CCFG_PCIDIVMODE_6:
70		case TX4927_CCFG_PCIDIVMODE_3:
71		default:
72			pcidivmode = TX4927_CCFG_PCIDIVMODE_3;
73			pciclk = txx9_cpu_clock / 3;
74		}
75		tx4927_ccfg_change(TX4927_CCFG_PCIDIVMODE_MASK,
76				   pcidivmode);
77		pr_debug("PCICLK: ccfg:%08lx\n",
78			 (unsigned long)__raw_readq(&tx4927_ccfgptr->ccfg));
79	} else
80		pciclk = -1;
81	return pciclk;
82}
83
84void __init tx4927_setup_pcierr_irq(void)
85{
86	if (request_irq(TXX9_IRQ_BASE + TX4927_IR_PCIERR,
87			tx4927_pcierr_interrupt,
88			0, "PCI error",
89			(void *)TX4927_PCIC_REG))
90		pr_warn("Failed to request irq for PCIERR\n");
91}
92