1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * arch/sh/drivers/pci/fixups-landisk.c
4  *
5  * PCI initialization for the I-O DATA Device, Inc. LANDISK board
6  *
7  * Copyright (C) 2006 kogiidena
8  * Copyright (C) 2010 Nobuhiro Iwamatsu
9  */
10 #include <linux/kernel.h>
11 #include <linux/types.h>
12 #include <linux/init.h>
13 #include <linux/delay.h>
14 #include <linux/pci.h>
15 #include <linux/sh_intc.h>
16 #include "pci-sh4.h"
17 
18 #define PCIMCR_MRSET_OFF	0xBFFFFFFF
19 #define PCIMCR_RFSH_OFF		0xFFFFFFFB
20 
pcibios_map_platform_irq(const struct pci_dev * pdev,u8 slot,u8 pin)21 int pcibios_map_platform_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
22 {
23 	/*
24 	 * slot0: pin1-4 = irq5,6,7,8
25 	 * slot1: pin1-4 = irq6,7,8,5
26 	 * slot2: pin1-4 = irq7,8,5,6
27 	 * slot3: pin1-4 = irq8,5,6,7
28 	 */
29 	int irq = ((slot + pin - 1) & 0x3) + evt2irq(0x2a0);
30 
31 	if ((slot | (pin - 1)) > 0x3) {
32 		printk(KERN_WARNING "PCI: Bad IRQ mapping request for slot %d pin %c\n",
33 		       slot, pin - 1 + 'A');
34 		return -1;
35 	}
36 	return irq;
37 }
38 
pci_fixup_pcic(struct pci_channel * chan)39 int pci_fixup_pcic(struct pci_channel *chan)
40 {
41 	unsigned long bcr1, mcr;
42 
43 	bcr1 = __raw_readl(SH7751_BCR1);
44 	bcr1 |= 0x40080000;	/* Enable Bit 19 BREQEN, set PCIC to slave */
45 	pci_write_reg(chan, bcr1, SH4_PCIBCR1);
46 
47 	mcr = __raw_readl(SH7751_MCR);
48 	mcr = (mcr & PCIMCR_MRSET_OFF) & PCIMCR_RFSH_OFF;
49 	pci_write_reg(chan, mcr, SH4_PCIMCR);
50 
51 	pci_write_reg(chan, 0x0c000000, SH7751_PCICONF5);
52 	pci_write_reg(chan, 0xd0000000, SH7751_PCICONF6);
53 	pci_write_reg(chan, 0x0c000000, SH4_PCILAR0);
54 	pci_write_reg(chan, 0x00000000, SH4_PCILAR1);
55 
56 	return 0;
57 }
58