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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 0b17998e509e5614633aee0a3c5d6248f8bc580b / . / drivers / pci / pci_gt64120.c
blob: 4756f1424c87de9408e7d00342ab445991867d72 [file] [log] [blame]
Gabor Juhosfeaa6062013-05-22 03:57:42 +0000[diff] [blame]1/*
2 * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
3 *
4 * Based on the Linux implementation.
5 * Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc.
6 * Authors: Carsten Langgaard <carstenl@mips.com>
7 * Maciej W. Rozycki <macro@mips.com>
8 *
Tom Rini0b179982013-07-24 09:34:30 -0400[diff] [blame^]9 * SPDX-License-Identifier: GPL-2.0
Gabor Juhosfeaa6062013-05-22 03:57:42 +0000[diff] [blame]10 */
11
12#include <common.h>
13#include <gt64120.h>
14#include <pci.h>
15#include <pci_gt64120.h>
16
17#include <asm/io.h>
18
19#define PCI_ACCESS_READ 0
20#define PCI_ACCESS_WRITE 1
21
22struct gt64120_regs {
23 u8 unused_000[0xc18];
24 u32 intrcause;
25 u8 unused_c1c[0x0dc];
26 u32 pci0_cfgaddr;
27 u32 pci0_cfgdata;
28};
29
30struct gt64120_pci_controller {
31 struct pci_controller hose;
32 struct gt64120_regs *regs;
33};
34
35static inline struct gt64120_pci_controller *
36hose_to_gt64120(struct pci_controller *hose)
37{
38 return container_of(hose, struct gt64120_pci_controller, hose);
39}
40
41#define GT_INTRCAUSE_ABORT_BITS \
42 (GT_INTRCAUSE_MASABORT0_BIT | GT_INTRCAUSE_TARABORT0_BIT)
43
44static int gt_config_access(struct gt64120_pci_controller *gt,
45 unsigned char access_type, pci_dev_t bdf,
46 int where, u32 *data)
47{
48 unsigned int bus = PCI_BUS(bdf);
49 unsigned int dev = PCI_DEV(bdf);
50 unsigned int devfn = PCI_DEV(bdf) << 3 | PCI_FUNC(bdf);
51 u32 intr;
52 u32 addr;
53 u32 val;
54
55 if (bus == 0 && dev >= 31) {
56 /* Because of a bug in the galileo (for slot 31). */
57 return -1;
58 }
59
60 if (access_type == PCI_ACCESS_WRITE)
61 debug("PCI WR %02x:%02x.%x reg:%02d data:%08x\n",
62 PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), where, *data);
63
64 /* Clear cause register bits */
65 writel(~GT_INTRCAUSE_ABORT_BITS, &gt->regs->intrcause);
66
67 addr = GT_PCI0_CFGADDR_CONFIGEN_BIT;
68 addr |= bus << GT_PCI0_CFGADDR_BUSNUM_SHF;
69 addr |= devfn << GT_PCI0_CFGADDR_FUNCTNUM_SHF;
70 addr |= (where / 4) << GT_PCI0_CFGADDR_REGNUM_SHF;
71
72 /* Setup address */
73 writel(addr, &gt->regs->pci0_cfgaddr);
74
75 if (access_type == PCI_ACCESS_WRITE) {
76 if (bus == 0 && dev == 0) {
77 /*
78 * The Galileo system controller is acting
79 * differently than other devices.
80 */
81 val = *data;
82 } else {
83 val = cpu_to_le32(*data);
84 }
85
86 writel(val, &gt->regs->pci0_cfgdata);
87 } else {
88 val = readl(&gt->regs->pci0_cfgdata);
89
90 if (bus == 0 && dev == 0) {
91 /*
92 * The Galileo system controller is acting
93 * differently than other devices.
94 */
95 *data = val;
96 } else {
97 *data = le32_to_cpu(val);
98 }
99 }
100
101 /* Check for master or target abort */
102 intr = readl(&gt->regs->intrcause);
103 if (intr & GT_INTRCAUSE_ABORT_BITS) {
104 /* Error occurred, clear abort bits */
105 writel(~GT_INTRCAUSE_ABORT_BITS, &gt->regs->intrcause);
106 return -1;
107 }
108
109 if (access_type == PCI_ACCESS_READ)
110 debug("PCI RD %02x:%02x.%x reg:%02d data:%08x\n",
111 PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), where, *data);
112
113 return 0;
114}
115
116static int gt_read_config_dword(struct pci_controller *hose, pci_dev_t dev,
117 int where, u32 *value)
118{
119 struct gt64120_pci_controller *gt = hose_to_gt64120(hose);
120
121 *value = 0xffffffff;
122 return gt_config_access(gt, PCI_ACCESS_READ, dev, where, value);
123}
124
125static int gt_write_config_dword(struct pci_controller *hose, pci_dev_t dev,
126 int where, u32 value)
127{
128 struct gt64120_pci_controller *gt = hose_to_gt64120(hose);
129 u32 data = value;
130
131 return gt_config_access(gt, PCI_ACCESS_WRITE, dev, where, &data);
132}
133
134void gt64120_pci_init(void *regs, unsigned long sys_bus, unsigned long sys_phys,
135 unsigned long sys_size, unsigned long mem_bus,
136 unsigned long mem_phys, unsigned long mem_size,
137 unsigned long io_bus, unsigned long io_phys,
138 unsigned long io_size)
139{
140 static struct gt64120_pci_controller global_gt;
141 struct gt64120_pci_controller *gt;
142 struct pci_controller *hose;
143
144 gt = &global_gt;
145 gt->regs = regs;
146
147 hose = &gt->hose;
148
149 hose->first_busno = 0;
150 hose->last_busno = 0;
151
152 /* System memory space */
153 pci_set_region(&hose->regions[0], sys_bus, sys_phys, sys_size,
154 PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
155
156 /* PCI memory space */
157 pci_set_region(&hose->regions[1], mem_bus, mem_phys, mem_size,
158 PCI_REGION_MEM);
159
160 /* PCI I/O space */
161 pci_set_region(&hose->regions[2], io_bus, io_phys, io_size,
162 PCI_REGION_IO);
163
164 hose->region_count = 3;
165
166 pci_set_ops(hose,
167 pci_hose_read_config_byte_via_dword,
168 pci_hose_read_config_word_via_dword,
169 gt_read_config_dword,
170 pci_hose_write_config_byte_via_dword,
171 pci_hose_write_config_word_via_dword,
172 gt_write_config_dword);
173
174 pci_register_hose(hose);
175 hose->last_busno = pci_hose_scan(hose);
176}