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
20 int __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
59 void __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
71 int __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
115 int 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
135 void __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
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