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. */
29 static 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 
pcibios_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)50 int 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 */
pcibios_plat_dev_init(struct pci_dev * dev)89 int pcibios_plat_dev_init(struct pci_dev *dev)
90 {
91 	return 0;
92 }
93 
94 /* CS5536 SPEC. fixup */
loongson_cs5536_isa_fixup(struct pci_dev * pdev)95 static 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 
loongson_cs5536_ide_fixup(struct pci_dev * pdev)102 static 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 
loongson_cs5536_acc_fixup(struct pci_dev * pdev)109 static 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 
loongson_cs5536_ohci_fixup(struct pci_dev * pdev)117 static 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 
loongson_cs5536_ehci_fixup(struct pci_dev * pdev)124 static 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 
loongson_nec_fixup(struct pci_dev * pdev)136 static 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 
145 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA,
146 			 loongson_cs5536_isa_fixup);
147 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_OHC,
148 			 loongson_cs5536_ohci_fixup);
149 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_EHC,
150 			 loongson_cs5536_ehci_fixup);
151 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_AUDIO,
152 			 loongson_cs5536_acc_fixup);
153 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_IDE,
154 			 loongson_cs5536_ide_fixup);
155 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
156 			 loongson_nec_fixup);
157