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Dale Farnsworthe1a31072007-05-12 10:57:12 +10001/*
2 * PCI bus setup for Marvell mv64360/mv64460 host bridges (Discovery)
3 *
4 * Author: Dale Farnsworth <dale@farnsworth.org>
5 *
6 * 2007 (c) MontaVista, Software, Inc. This file is licensed under
7 * the terms of the GNU General Public License version 2. This program
8 * is licensed "as is" without any warranty of any kind, whether express
9 * or implied.
10 */
11
12#include <linux/stddef.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
Paul Gortmakerb56eade2011-05-27 13:27:45 -040015#include <linux/stat.h>
Dale Farnsworthe1a31072007-05-12 10:57:12 +100016#include <linux/pci.h>
17
18#include <asm/prom.h>
19#include <asm/pci-bridge.h>
20
21#define PCI_HEADER_TYPE_INVALID 0x7f /* Invalid PCI header type */
22
23#ifdef CONFIG_SYSFS
24/* 32-bit hex or dec stringified number + '\n' */
25#define MV64X60_VAL_LEN_MAX 11
26#define MV64X60_PCICFG_CPCI_HOTSWAP 0x68
27
Chris Wright2c3c8be2010-05-12 18:28:57 -070028static ssize_t mv64x60_hs_reg_read(struct file *filp, struct kobject *kobj,
Dale Farnsworthd102c9d2007-10-24 05:20:32 +100029 struct bin_attribute *attr, char *buf,
30 loff_t off, size_t count)
Dale Farnsworthe1a31072007-05-12 10:57:12 +100031{
32 struct pci_dev *phb;
33 u32 v;
34
35 if (off > 0)
36 return 0;
37 if (count < MV64X60_VAL_LEN_MAX)
38 return -EINVAL;
39
40 phb = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
41 if (!phb)
42 return -ENODEV;
43 pci_read_config_dword(phb, MV64X60_PCICFG_CPCI_HOTSWAP, &v);
44 pci_dev_put(phb);
45
46 return sprintf(buf, "0x%08x\n", v);
47}
48
Chris Wright2c3c8be2010-05-12 18:28:57 -070049static ssize_t mv64x60_hs_reg_write(struct file *filp, struct kobject *kobj,
Dale Farnsworthd102c9d2007-10-24 05:20:32 +100050 struct bin_attribute *attr, char *buf,
51 loff_t off, size_t count)
Dale Farnsworthe1a31072007-05-12 10:57:12 +100052{
53 struct pci_dev *phb;
54 u32 v;
55
56 if (off > 0)
57 return 0;
58 if (count <= 0)
59 return -EINVAL;
60
61 if (sscanf(buf, "%i", &v) != 1)
62 return -EINVAL;
63
64 phb = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
65 if (!phb)
66 return -ENODEV;
67 pci_write_config_dword(phb, MV64X60_PCICFG_CPCI_HOTSWAP, v);
68 pci_dev_put(phb);
69
70 return count;
71}
72
73static struct bin_attribute mv64x60_hs_reg_attr = { /* Hotswap register */
74 .attr = {
75 .name = "hs_reg",
76 .mode = S_IRUGO | S_IWUSR,
Dale Farnsworthe1a31072007-05-12 10:57:12 +100077 },
78 .size = MV64X60_VAL_LEN_MAX,
79 .read = mv64x60_hs_reg_read,
80 .write = mv64x60_hs_reg_write,
81};
82
83static int __init mv64x60_sysfs_init(void)
84{
85 struct device_node *np;
86 struct platform_device *pdev;
87 const unsigned int *prop;
88
Mark A. Greera1810b42008-04-08 08:09:03 +100089 np = of_find_compatible_node(NULL, NULL, "marvell,mv64360");
Dale Farnsworthe1a31072007-05-12 10:57:12 +100090 if (!np)
91 return 0;
92
93 prop = of_get_property(np, "hs_reg_valid", NULL);
94 of_node_put(np);
95
Mark A. Greera1810b42008-04-08 08:09:03 +100096 pdev = platform_device_register_simple("marvell,mv64360", 0, NULL, 0);
Dale Farnsworthe1a31072007-05-12 10:57:12 +100097 if (IS_ERR(pdev))
98 return PTR_ERR(pdev);
99
100 return sysfs_create_bin_file(&pdev->dev.kobj, &mv64x60_hs_reg_attr);
101}
102
103subsys_initcall(mv64x60_sysfs_init);
104
105#endif /* CONFIG_SYSFS */
106
Greg Kroah-Hartmancad5cef2012-12-21 14:04:10 -0800107static void mv64x60_pci_fixup_early(struct pci_dev *dev)
Dale Farnsworthe1a31072007-05-12 10:57:12 +1000108{
109 /*
110 * Set the host bridge hdr_type to an invalid value so that
111 * pci_setup_device() will ignore the host bridge.
112 */
113 dev->hdr_type = PCI_HEADER_TYPE_INVALID;
114}
115DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_MV64360,
116 mv64x60_pci_fixup_early);
117DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_MV64460,
118 mv64x60_pci_fixup_early);
119
120static int __init mv64x60_add_bridge(struct device_node *dev)
121{
122 int len;
123 struct pci_controller *hose;
124 struct resource rsrc;
125 const int *bus_range;
126 int primary;
127
128 memset(&rsrc, 0, sizeof(rsrc));
129
130 /* Fetch host bridge registers address */
131 if (of_address_to_resource(dev, 0, &rsrc)) {
132 printk(KERN_ERR "No PCI reg property in device tree\n");
133 return -ENODEV;
134 }
135
136 /* Get bus range if any */
137 bus_range = of_get_property(dev, "bus-range", &len);
138 if (bus_range == NULL || len < 2 * sizeof(int))
139 printk(KERN_WARNING "Can't get bus-range for %s, assume"
140 " bus 0\n", dev->full_name);
141
Kumar Galadbf84712007-06-27 01:56:50 -0500142 hose = pcibios_alloc_controller(dev);
Dale Farnsworthe1a31072007-05-12 10:57:12 +1000143 if (!hose)
144 return -ENOMEM;
145
Dale Farnsworthe1a31072007-05-12 10:57:12 +1000146 hose->first_busno = bus_range ? bus_range[0] : 0;
147 hose->last_busno = bus_range ? bus_range[1] : 0xff;
148
Kumar Gala2e56ff22007-07-19 16:07:35 -0500149 setup_indirect_pci(hose, rsrc.start, rsrc.start + 4, 0);
Kumar Gala0a3786c2007-06-25 13:32:48 -0500150 hose->self_busno = hose->first_busno;
Dale Farnsworthe1a31072007-05-12 10:57:12 +1000151
152 printk(KERN_INFO "Found MV64x60 PCI host bridge at 0x%016llx. "
153 "Firmware bus number: %d->%d\n",
154 (unsigned long long)rsrc.start, hose->first_busno,
155 hose->last_busno);
156
157 /* Interpret the "ranges" property */
158 /* This also maps the I/O region and sets isa_io/mem_base */
159 primary = (hose->first_busno == 0);
160 pci_process_bridge_OF_ranges(hose, dev, primary);
161
162 return 0;
163}
164
165void __init mv64x60_pci_init(void)
166{
Cyrill Gorcunov26cb7d82007-11-30 06:44:36 +1100167 struct device_node *np;
Dale Farnsworthe1a31072007-05-12 10:57:12 +1000168
Mark A. Greera1810b42008-04-08 08:09:03 +1000169 for_each_compatible_node(np, "pci", "marvell,mv64360-pci")
Dale Farnsworthe1a31072007-05-12 10:57:12 +1000170 mv64x60_add_bridge(np);
171}