1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2008 Lemote Technology
4 * Copyright (C) 2004 ICT CAS
5 * Author: Li xiaoyu, lixy@ict.ac.cn
6 *
7 * Copyright (C) 2007 Lemote, Inc.
8 * Author: Fuxin Zhang, zhangfx@lemote.com
9 */
10#include <linux/init.h>
11#include <linux/pci.h>
12
13#include <loongson.h>
14#include <cs5536/cs5536.h>
15#include <cs5536/cs5536_pci.h>
16
17/* PCI interrupt pins
18 *
19 * These should not be changed, or you should consider loongson2f interrupt
20 * register and your pci card dispatch
21 */
22
23#define PCIA		4
24#define PCIB		5
25#define PCIC		6
26#define PCID		7
27
28/* all the pci device has the PCIA pin, check the datasheet. */
29static char irq_tab[][5] = {
30	/*	INTA	INTB	INTC	INTD */
31	{0, 0, 0, 0, 0},	/*  11: Unused */
32	{0, 0, 0, 0, 0},	/*  12: Unused */
33	{0, 0, 0, 0, 0},	/*  13: Unused */
34	{0, 0, 0, 0, 0},	/*  14: Unused */
35	{0, 0, 0, 0, 0},	/*  15: Unused */
36	{0, 0, 0, 0, 0},	/*  16: Unused */
37	{0, PCIA, 0, 0, 0},	/*  17: RTL8110-0 */
38	{0, PCIB, 0, 0, 0},	/*  18: RTL8110-1 */
39	{0, PCIC, 0, 0, 0},	/*  19: SiI3114 */
40	{0, PCID, 0, 0, 0},	/*  20: 3-ports nec usb */
41	{0, PCIA, PCIB, PCIC, PCID},	/*  21: PCI-SLOT */
42	{0, 0, 0, 0, 0},	/*  22: Unused */
43	{0, 0, 0, 0, 0},	/*  23: Unused */
44	{0, 0, 0, 0, 0},	/*  24: Unused */
45	{0, 0, 0, 0, 0},	/*  25: Unused */
46	{0, 0, 0, 0, 0},	/*  26: Unused */
47	{0, 0, 0, 0, 0},	/*  27: Unused */
48};
49
50int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
51{
52	int virq;
53
54	if ((PCI_SLOT(dev->devfn) != PCI_IDSEL_CS5536)
55	    && (PCI_SLOT(dev->devfn) < 32)) {
56		virq = irq_tab[slot][pin];
57		printk(KERN_INFO "slot: %d, pin: %d, irq: %d\n", slot, pin,
58		       virq + LOONGSON_IRQ_BASE);
59		if (virq != 0)
60			return LOONGSON_IRQ_BASE + virq;
61		else
62			return 0;
63	} else if (PCI_SLOT(dev->devfn) == PCI_IDSEL_CS5536) {	/*  cs5536 */
64		switch (PCI_FUNC(dev->devfn)) {
65		case 2:
66			pci_write_config_byte(dev, PCI_INTERRUPT_LINE,
67					      CS5536_IDE_INTR);
68			return CS5536_IDE_INTR; /*  for IDE */
69		case 3:
70			pci_write_config_byte(dev, PCI_INTERRUPT_LINE,
71					      CS5536_ACC_INTR);
72			return CS5536_ACC_INTR; /*  for AUDIO */
73		case 4: /*  for OHCI */
74		case 5: /*  for EHCI */
75		case 6: /*  for UDC */
76		case 7: /*  for OTG */
77			pci_write_config_byte(dev, PCI_INTERRUPT_LINE,
78					      CS5536_USB_INTR);
79			return CS5536_USB_INTR;
80		}
81		return dev->irq;
82	} else {
83		printk(KERN_INFO "strange PCI slot number.\n");
84		return 0;
85	}
86}
87
88/* Do platform specific device initialization at pci_enable_device() time */
89int pcibios_plat_dev_init(struct pci_dev *dev)
90{
91	return 0;
92}
93
94/* CS5536 SPEC. fixup */
95static void loongson_cs5536_isa_fixup(struct pci_dev *pdev)
96{
97	/* the uart1 and uart2 interrupt in PIC is enabled as default */
98	pci_write_config_dword(pdev, PCI_UART1_INT_REG, 1);
99	pci_write_config_dword(pdev, PCI_UART2_INT_REG, 1);
100}
101
102static void loongson_cs5536_ide_fixup(struct pci_dev *pdev)
103{
104	/* setting the mutex pin as IDE function */
105	pci_write_config_dword(pdev, PCI_IDE_CFG_REG,
106			       CS5536_IDE_FLASH_SIGNATURE);
107}
108
109static void loongson_cs5536_acc_fixup(struct pci_dev *pdev)
110{
111	/* enable the AUDIO interrupt in PIC  */
112	pci_write_config_dword(pdev, PCI_ACC_INT_REG, 1);
113
114	pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xc0);
115}
116
117static void loongson_cs5536_ohci_fixup(struct pci_dev *pdev)
118{
119	/* enable the OHCI interrupt in PIC */
120	/* THE OHCI, EHCI, UDC, OTG are shared with interrupt in PIC */
121	pci_write_config_dword(pdev, PCI_OHCI_INT_REG, 1);
122}
123
124static void loongson_cs5536_ehci_fixup(struct pci_dev *pdev)
125{
126	u32 hi, lo;
127
128	/* Serial short detect enable */
129	_rdmsr(USB_MSR_REG(USB_CONFIG), &hi, &lo);
130	_wrmsr(USB_MSR_REG(USB_CONFIG), (1 << 1) | (1 << 3), lo);
131
132	/* setting the USB2.0 micro frame length */
133	pci_write_config_dword(pdev, PCI_EHCI_FLADJ_REG, 0x2000);
134}
135
136static void loongson_nec_fixup(struct pci_dev *pdev)
137{
138	unsigned int val;
139
140	pci_read_config_dword(pdev, 0xe0, &val);
141	/* Only 2 port be used */
142	pci_write_config_dword(pdev, 0xe0, (val & ~3) | 0x2);
143}
144
145DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA,
146			 loongson_cs5536_isa_fixup);
147DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_OHC,
148			 loongson_cs5536_ohci_fixup);
149DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_EHC,
150			 loongson_cs5536_ehci_fixup);
151DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_AUDIO,
152			 loongson_cs5536_acc_fixup);
153DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_IDE,
154			 loongson_cs5536_ide_fixup);
155DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
156			 loongson_nec_fixup);
157