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/tx4938.h>
19
20int __init tx4938_report_pciclk(void)
21{
22	int pciclk = 0;
23
24	pr_info("PCIC --%s PCICLK:",
25		(__raw_readq(&tx4938_ccfgptr->ccfg) & TX4938_CCFG_PCI66) ?
26		" PCI66" : "");
27	if (__raw_readq(&tx4938_ccfgptr->pcfg) & TX4938_PCFG_PCICLKEN_ALL) {
28		u64 ccfg = __raw_readq(&tx4938_ccfgptr->ccfg);
29		switch ((unsigned long)ccfg &
30			TX4938_CCFG_PCIDIVMODE_MASK) {
31		case TX4938_CCFG_PCIDIVMODE_4:
32			pciclk = txx9_cpu_clock / 4; break;
33		case TX4938_CCFG_PCIDIVMODE_4_5:
34			pciclk = txx9_cpu_clock * 2 / 9; break;
35		case TX4938_CCFG_PCIDIVMODE_5:
36			pciclk = txx9_cpu_clock / 5; break;
37		case TX4938_CCFG_PCIDIVMODE_5_5:
38			pciclk = txx9_cpu_clock * 2 / 11; break;
39		case TX4938_CCFG_PCIDIVMODE_8:
40			pciclk = txx9_cpu_clock / 8; break;
41		case TX4938_CCFG_PCIDIVMODE_9:
42			pciclk = txx9_cpu_clock / 9; break;
43		case TX4938_CCFG_PCIDIVMODE_10:
44			pciclk = txx9_cpu_clock / 10; break;
45		case TX4938_CCFG_PCIDIVMODE_11:
46			pciclk = txx9_cpu_clock / 11; break;
47		}
48		pr_cont("Internal(%u.%uMHz)",
49			(pciclk + 50000) / 1000000,
50			((pciclk + 50000) / 100000) % 10);
51	} else {
52		pr_cont("External");
53		pciclk = -1;
54	}
55	pr_cont("\n");
56	return pciclk;
57}
58
59void __init tx4938_report_pci1clk(void)
60{
61	__u64 ccfg = __raw_readq(&tx4938_ccfgptr->ccfg);
62	unsigned int pciclk =
63		txx9_gbus_clock / ((ccfg & TX4938_CCFG_PCI1DMD) ? 4 : 2);
64
65	pr_info("PCIC1 -- %sPCICLK:%u.%uMHz\n",
66		(ccfg & TX4938_CCFG_PCI1_66) ? "PCI66 " : "",
67		(pciclk + 50000) / 1000000,
68		((pciclk + 50000) / 100000) % 10);
69}
70
71int __init tx4938_pciclk66_setup(void)
72{
73	int pciclk;
74
75	/* Assert M66EN */
76	tx4938_ccfg_set(TX4938_CCFG_PCI66);
77	/* Double PCICLK (if possible) */
78	if (__raw_readq(&tx4938_ccfgptr->pcfg) & TX4938_PCFG_PCICLKEN_ALL) {
79		unsigned int pcidivmode = 0;
80		u64 ccfg = __raw_readq(&tx4938_ccfgptr->ccfg);
81		pcidivmode = (unsigned long)ccfg &
82			TX4938_CCFG_PCIDIVMODE_MASK;
83		switch (pcidivmode) {
84		case TX4938_CCFG_PCIDIVMODE_8:
85		case TX4938_CCFG_PCIDIVMODE_4:
86			pcidivmode = TX4938_CCFG_PCIDIVMODE_4;
87			pciclk = txx9_cpu_clock / 4;
88			break;
89		case TX4938_CCFG_PCIDIVMODE_9:
90		case TX4938_CCFG_PCIDIVMODE_4_5:
91			pcidivmode = TX4938_CCFG_PCIDIVMODE_4_5;
92			pciclk = txx9_cpu_clock * 2 / 9;
93			break;
94		case TX4938_CCFG_PCIDIVMODE_10:
95		case TX4938_CCFG_PCIDIVMODE_5:
96			pcidivmode = TX4938_CCFG_PCIDIVMODE_5;
97			pciclk = txx9_cpu_clock / 5;
98			break;
99		case TX4938_CCFG_PCIDIVMODE_11:
100		case TX4938_CCFG_PCIDIVMODE_5_5:
101		default:
102			pcidivmode = TX4938_CCFG_PCIDIVMODE_5_5;
103			pciclk = txx9_cpu_clock * 2 / 11;
104			break;
105		}
106		tx4938_ccfg_change(TX4938_CCFG_PCIDIVMODE_MASK,
107				   pcidivmode);
108		pr_debug("PCICLK: ccfg:%08lx\n",
109			 (unsigned long)__raw_readq(&tx4938_ccfgptr->ccfg));
110	} else
111		pciclk = -1;
112	return pciclk;
113}
114
115int tx4938_pcic1_map_irq(const struct pci_dev *dev, u8 slot)
116{
117	if (get_tx4927_pcicptr(dev->bus->sysdata) == tx4938_pcic1ptr) {
118		switch (slot) {
119		case TX4927_PCIC_IDSEL_AD_TO_SLOT(31):
120			if (__raw_readq(&tx4938_ccfgptr->pcfg) &
121			    TX4938_PCFG_ETH0_SEL)
122				return TXX9_IRQ_BASE + TX4938_IR_ETH0;
123			break;
124		case TX4927_PCIC_IDSEL_AD_TO_SLOT(30):
125			if (__raw_readq(&tx4938_ccfgptr->pcfg) &
126			    TX4938_PCFG_ETH1_SEL)
127				return TXX9_IRQ_BASE + TX4938_IR_ETH1;
128			break;
129		}
130		return 0;
131	}
132	return -1;
133}
134
135void __init tx4938_setup_pcierr_irq(void)
136{
137	if (request_irq(TXX9_IRQ_BASE + TX4938_IR_PCIERR,
138			tx4927_pcierr_interrupt,
139			0, "PCI error",
140			(void *)TX4927_PCIC_REG))
141		pr_warn("Failed to request irq for PCIERR\n");
142}
143