1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kernel.h>
3 #include <linux/types.h>
4 #include <linux/init.h>
5 #include <linux/delay.h>
6 #include <linux/pci.h>
7 #include <linux/io.h>
8 #include <linux/sh_intc.h>
9 #include "pci-sh4.h"
10
11 int pcibios_map_platform_irq(const struct pci_dev *, u8 slot, u8 pin)
12 {
13 switch (slot) {
14 case 0: return evt2irq(0x3a0);
15 case 1: return evt2irq(0x3a0); /* AMD Ethernet controller */
16 case 2: return -1;
17 case 3: return -1;
18 case 4: return -1;
19 default:
20 printk("PCI: Bad IRQ mapping request for slot %d\n", slot);
21 return -1;
22 }
23 }
24
25 #define PCIMCR_MRSET_OFF 0xBFFFFFFF
26 #define PCIMCR_RFSH_OFF 0xFFFFFFFB
27
28 /*
29 * Only long word accesses of the PCIC's internal local registers and the
30 * configuration registers from the CPU is supported.
31 */
32 #define PCIC_WRITE(x,v) writel((v), PCI_REG(x))
33 #define PCIC_READ(x) readl(PCI_REG(x))
34
35 /*
36 * Description: This function sets up and initializes the pcic, sets
37 * up the BARS, maps the DRAM into the address space etc, etc.
38 */
39 int pci_fixup_pcic(struct pci_channel *chan)
40 {
41 unsigned long bcr1, wcr1, wcr2, wcr3, mcr;
42 unsigned short bcr2;
43
44 /*
45 * Initialize the slave bus controller on the pcic. The values used
46 * here should not be hardcoded, but they should be taken from the bsc
47 * on the processor, to make this function as generic as possible.
48 * (i.e. Another sbc may usr different SDRAM timing settings -- in order
49 * for the pcic to work, its settings need to be exactly the same.)
50 */
51 bcr1 = (*(volatile unsigned long*)(SH7751_BCR1));
52 bcr2 = (*(volatile unsigned short*)(SH7751_BCR2));
53 wcr1 = (*(volatile unsigned long*)(SH7751_WCR1));
54 wcr2 = (*(volatile unsigned long*)(SH7751_WCR2));
55 wcr3 = (*(volatile unsigned long*)(SH7751_WCR3));
56 mcr = (*(volatile unsigned long*)(SH7751_MCR));
57
58 bcr1 = bcr1 | 0x00080000; /* Enable Bit 19, BREQEN */
59 (*(volatile unsigned long*)(SH7751_BCR1)) = bcr1;
60
61 bcr1 = bcr1 | 0x40080000; /* Enable Bit 19 BREQEN, set PCIC to slave */
62 PCIC_WRITE(SH7751_PCIBCR1, bcr1); /* PCIC BCR1 */
63 PCIC_WRITE(SH7751_PCIBCR2, bcr2); /* PCIC BCR2 */
64 PCIC_WRITE(SH7751_PCIWCR1, wcr1); /* PCIC WCR1 */
65 PCIC_WRITE(SH7751_PCIWCR2, wcr2); /* PCIC WCR2 */
66 PCIC_WRITE(SH7751_PCIWCR3, wcr3); /* PCIC WCR3 */
67 mcr = (mcr & PCIMCR_MRSET_OFF) & PCIMCR_RFSH_OFF;
68 PCIC_WRITE(SH7751_PCIMCR, mcr); /* PCIC MCR */
69
70
71 /* Enable all interrupts, so we know what to fix */
72 PCIC_WRITE(SH7751_PCIINTM, 0x0000c3ff);
73 PCIC_WRITE(SH7751_PCIAINTM, 0x0000380f);
74
75 /* Set up standard PCI config registers */
76 PCIC_WRITE(SH7751_PCICONF1, 0xF39000C7); /* Bus Master, Mem & I/O access */
77 PCIC_WRITE(SH7751_PCICONF2, 0x00000000); /* PCI Class code & Revision ID */
78 PCIC_WRITE(SH7751_PCICONF4, 0xab000001); /* PCI I/O address (local regs) */
79 PCIC_WRITE(SH7751_PCICONF5, 0x0c000000); /* PCI MEM address (local RAM) */
80 PCIC_WRITE(SH7751_PCICONF6, 0xd0000000); /* PCI MEM address (unused) */
81 PCIC_WRITE(SH7751_PCICONF11, 0x35051054); /* PCI Subsystem ID & Vendor ID */
82 PCIC_WRITE(SH7751_PCILSR0, 0x03f00000); /* MEM (full 64M exposed) */
83 PCIC_WRITE(SH7751_PCILSR1, 0x00000000); /* MEM (unused) */
84 PCIC_WRITE(SH7751_PCILAR0, 0x0c000000); /* MEM (direct map from PCI) */
85 PCIC_WRITE(SH7751_PCILAR1, 0x00000000); /* MEM (unused) */
86
87 /* Now turn it on... */
88 PCIC_WRITE(SH7751_PCICR, 0xa5000001);
89
90 /*
91 * Set PCIMBR and PCIIOBR here, assuming a single window
92 * (16M MEM, 256K IO) is enough. If a larger space is
93 * needed, the readx/writex and inx/outx functions will
94 * have to do more (e.g. setting registers for each call).
95 */
96
97 /*
98 * Set the MBR so PCI address is one-to-one with window,
99 * meaning all calls go straight through... use BUG_ON to
100 * catch erroneous assumption.
101 */
102 BUG_ON(chan->resources[1].start != SH7751_PCI_MEMORY_BASE);
103
104 PCIC_WRITE(SH7751_PCIMBR, chan->resources[1].start);
105
106 /* Set IOBR for window containing area specified in pci.h */
107 PCIC_WRITE(SH7751_PCIIOBR, (chan->resources[0].start & SH7751_PCIIOBR_MASK));
108
109 /* All done, may as well say so... */
110 printk("SH7751 PCI: Finished initialization of the PCI controller\n");
111
112 return 1;
113 }
114
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