[mirror_ubuntu-artful-kernel.git] / arch / powerpc / sysdev / mv64x60_pci.c

/*
 * PCI bus setup for Marvell mv64360/mv64460 host bridges (Discovery)
 *
 * Author: Dale Farnsworth <dale@farnsworth.org>
 *
 * 2007 (c) MontaVista, Software, Inc.  This file is licensed under
 * the terms of the GNU General Public License version 2.  This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>

#include <asm/prom.h>
#include <asm/pci-bridge.h>

#define PCI_HEADER_TYPE_INVALID		0x7f	/* Invalid PCI header type */

#ifdef CONFIG_SYSFS
/* 32-bit hex or dec stringified number + '\n' */
#define MV64X60_VAL_LEN_MAX		11
#define MV64X60_PCICFG_CPCI_HOTSWAP	0x68

static ssize_t mv64x60_hs_reg_read(struct kobject *kobj, char *buf, loff_t off,
				   size_t count)
{
	struct pci_dev *phb;
	u32 v;

	if (off > 0)
		return 0;
	if (count < MV64X60_VAL_LEN_MAX)
		return -EINVAL;

	phb = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
	if (!phb)
		return -ENODEV;
	pci_read_config_dword(phb, MV64X60_PCICFG_CPCI_HOTSWAP, &v);
	pci_dev_put(phb);

	return sprintf(buf, "0x%08x\n", v);
}

static ssize_t mv64x60_hs_reg_write(struct kobject *kobj, char *buf, loff_t off,
				    size_t count)
{
	struct pci_dev *phb;
	u32 v;

	if (off > 0)
		return 0;
	if (count <= 0)
		return -EINVAL;

	if (sscanf(buf, "%i", &v) != 1)
		return -EINVAL;

	phb = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
	if (!phb)
		return -ENODEV;
	pci_write_config_dword(phb, MV64X60_PCICFG_CPCI_HOTSWAP, v);
	pci_dev_put(phb);

	return count;
}

static struct bin_attribute mv64x60_hs_reg_attr = { /* Hotswap register */
	.attr = {
		.name = "hs_reg",
		.mode = S_IRUGO | S_IWUSR,
		.owner = THIS_MODULE,
	},
	.size  = MV64X60_VAL_LEN_MAX,
	.read  = mv64x60_hs_reg_read,
	.write = mv64x60_hs_reg_write,
};

static int __init mv64x60_sysfs_init(void)
{
	struct device_node *np;
	struct platform_device *pdev;
	const unsigned int *prop;

	np = of_find_compatible_node(NULL, NULL, "marvell,mv64x60");
	if (!np)
		return 0;

	prop = of_get_property(np, "hs_reg_valid", NULL);
	of_node_put(np);

	pdev = platform_device_register_simple("marvell,mv64x60", 0, NULL, 0);
	if (IS_ERR(pdev))
		return PTR_ERR(pdev);

	return sysfs_create_bin_file(&pdev->dev.kobj, &mv64x60_hs_reg_attr);
}

subsys_initcall(mv64x60_sysfs_init);

#endif /* CONFIG_SYSFS */

static void __init mv64x60_pci_fixup_early(struct pci_dev *dev)
{
	/*
	 * Set the host bridge hdr_type to an invalid value so that
	 * pci_setup_device() will ignore the host bridge.
	 */
	dev->hdr_type = PCI_HEADER_TYPE_INVALID;
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_MV64360,
			mv64x60_pci_fixup_early);
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_MV64460,
			mv64x60_pci_fixup_early);

static int __init mv64x60_add_bridge(struct device_node *dev)
{
	int len;
	struct pci_controller *hose;
	struct resource rsrc;
	const int *bus_range;
	int primary;

	memset(&rsrc, 0, sizeof(rsrc));

	/* Fetch host bridge registers address */
	if (of_address_to_resource(dev, 0, &rsrc)) {
		printk(KERN_ERR "No PCI reg property in device tree\n");
		return -ENODEV;
	}

	/* Get bus range if any */
	bus_range = of_get_property(dev, "bus-range", &len);
	if (bus_range == NULL || len < 2 * sizeof(int))
		printk(KERN_WARNING "Can't get bus-range for %s, assume"
		       " bus 0\n", dev->full_name);

	hose = pcibios_alloc_controller();
	if (!hose)
		return -ENOMEM;

	hose->arch_data = dev;

	hose->first_busno = bus_range ? bus_range[0] : 0;
	hose->last_busno = bus_range ? bus_range[1] : 0xff;

	setup_indirect_pci(hose, rsrc.start, rsrc.start + 4);
	hose->self_busno = hose->first_busno;

	printk(KERN_INFO "Found MV64x60 PCI host bridge at 0x%016llx. "
	       "Firmware bus number: %d->%d\n",
	       (unsigned long long)rsrc.start, hose->first_busno,
	       hose->last_busno);

	/* Interpret the "ranges" property */
	/* This also maps the I/O region and sets isa_io/mem_base */
	primary = (hose->first_busno == 0);
	pci_process_bridge_OF_ranges(hose, dev, primary);

	return 0;
}

void __init mv64x60_pci_init(void)
{
	struct device_node *np = NULL;

	while ((np = of_find_compatible_node(np, "pci", "marvell,mv64x60-pci")))
		mv64x60_add_bridge(np);
}
Commit	Line	Data
e1a3107b DF	1	/*
	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>
	15	#include <linux/pci.h>
	16
	17	#include <asm/prom.h>
	18	#include <asm/pci-bridge.h>
	19
	20	#define PCI_HEADER_TYPE_INVALID 0x7f /* Invalid PCI header type */
	21
	22	#ifdef CONFIG_SYSFS
	23	/* 32-bit hex or dec stringified number + '\n' */
	24	#define MV64X60_VAL_LEN_MAX 11
	25	#define MV64X60_PCICFG_CPCI_HOTSWAP 0x68
	26
	27	static ssize_t mv64x60_hs_reg_read(struct kobject kobj, char buf, loff_t off,
	28	size_t count)
	29	{
	30	struct pci_dev *phb;
	31	u32 v;
	32
	33	if (off > 0)
	34	return 0;
	35	if (count < MV64X60_VAL_LEN_MAX)
	36	return -EINVAL;
	37
	38	phb = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
	39	if (!phb)
	40	return -ENODEV;
	41	pci_read_config_dword(phb, MV64X60_PCICFG_CPCI_HOTSWAP, &v);
	42	pci_dev_put(phb);
	43
	44	return sprintf(buf, "0x%08x\n", v);
	45	}
	46
	47	static ssize_t mv64x60_hs_reg_write(struct kobject kobj, char buf, loff_t off,
	48	size_t count)
	49	{
	50	struct pci_dev *phb;
	51	u32 v;
	52
	53	if (off > 0)
	54	return 0;
	55	if (count <= 0)
	56	return -EINVAL;
	57
	58	if (sscanf(buf, "%i", &v) != 1)
	59	return -EINVAL;
	60
	61	phb = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
	62	if (!phb)
	63	return -ENODEV;
	64	pci_write_config_dword(phb, MV64X60_PCICFG_CPCI_HOTSWAP, v);
65	pci_dev_put(phb);
66
67	return count;
68	}
69
70	static struct bin_attribute mv64x60_hs_reg_attr = { /* Hotswap register */
71	.attr = {
72	.name = "hs_reg",
73	.mode = S_IRUGO \| S_IWUSR,
74	.owner = THIS_MODULE,
75	},
76	.size = MV64X60_VAL_LEN_MAX,
77	.read = mv64x60_hs_reg_read,
78	.write = mv64x60_hs_reg_write,
79	};
80
81	static int __init mv64x60_sysfs_init(void)
82	{
83	struct device_node *np;
84	struct platform_device *pdev;
85	const unsigned int *prop;
86
87	np = of_find_compatible_node(NULL, NULL, "marvell,mv64x60");
88	if (!np)
89	return 0;
90
91	prop = of_get_property(np, "hs_reg_valid", NULL);
92	of_node_put(np);
93
94	pdev = platform_device_register_simple("marvell,mv64x60", 0, NULL, 0);
95	if (IS_ERR(pdev))
96	return PTR_ERR(pdev);
97
98	return sysfs_create_bin_file(&pdev->dev.kobj, &mv64x60_hs_reg_attr);
99	}
100
101	subsys_initcall(mv64x60_sysfs_init);
102
103	#endif /* CONFIG_SYSFS */
104
105	static void __init mv64x60_pci_fixup_early(struct pci_dev *dev)
106	{
107	/*
108	* Set the host bridge hdr_type to an invalid value so that
109	* pci_setup_device() will ignore the host bridge.
110	*/
111	dev->hdr_type = PCI_HEADER_TYPE_INVALID;
112	}
113	DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_MV64360,
114	mv64x60_pci_fixup_early);
115	DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_MV64460,
116	mv64x60_pci_fixup_early);
117
118	static int __init mv64x60_add_bridge(struct device_node *dev)
119	{
120	int len;
121	struct pci_controller *hose;
122	struct resource rsrc;
123	const int *bus_range;
124	int primary;
125
126	memset(&rsrc, 0, sizeof(rsrc));
127
128	/* Fetch host bridge registers address */
129	if (of_address_to_resource(dev, 0, &rsrc)) {
130	printk(KERN_ERR "No PCI reg property in device tree\n");
131	return -ENODEV;
132	}
133
134	/* Get bus range if any */
135	bus_range = of_get_property(dev, "bus-range", &len);
136	if (bus_range == NULL \|\| len < 2 * sizeof(int))
137	printk(KERN_WARNING "Can't get bus-range for %s, assume"
138	" bus 0\n", dev->full_name);
139
140	hose = pcibios_alloc_controller();
141	if (!hose)
142	return -ENOMEM;
143
144	hose->arch_data = dev;
e1a3107b DF	145
	146	hose->first_busno = bus_range ? bus_range[0] : 0;
	147	hose->last_busno = bus_range ? bus_range[1] : 0xff;
	148
	149	setup_indirect_pci(hose, rsrc.start, rsrc.start + 4);
0a3786c5	150	hose->self_busno = hose->first_busno;
e1a3107b DF	151
	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
	165	void __init mv64x60_pci_init(void)
	166	{
	167	struct device_node *np = NULL;
	168
	169	while ((np = of_find_compatible_node(np, "pci", "marvell,mv64x60-pci")))
	170	mv64x60_add_bridge(np);
	171	}