1/*
2 * IO workarounds for PCI on Celleb/Cell platform
3 *
4 * (C) Copyright 2006-2007 TOSHIBA CORPORATION
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
21#undef DEBUG
22
23#include <linux/kernel.h>
24#include <linux/of_platform.h>
25#include <linux/slab.h>
26#include <linux/io.h>
27
28#include <asm/ppc-pci.h>
29#include <asm/pci-bridge.h>
30#include <asm/io-workarounds.h>
31
32#define SPIDER_PCI_DISABLE_PREFETCH
33
34struct spiderpci_iowa_private {
35	void __iomem *regs;
36};
37
38static void spiderpci_io_flush(struct iowa_bus *bus)
39{
40	struct spiderpci_iowa_private *priv;
41	u32 val;
42
43	priv = bus->private;
44	val = in_be32(priv->regs + SPIDER_PCI_DUMMY_READ);
45	iosync();
46}
47
48#define SPIDER_PCI_MMIO_READ(name, ret)					\
49static ret spiderpci_##name(const PCI_IO_ADDR addr)			\
50{									\
51	ret val = __do_##name(addr);					\
52	spiderpci_io_flush(iowa_mem_find_bus(addr));			\
53	return val;							\
54}
55
56#define SPIDER_PCI_MMIO_READ_STR(name)					\
57static void spiderpci_##name(const PCI_IO_ADDR addr, void *buf, 	\
58			     unsigned long count)			\
59{									\
60	__do_##name(addr, buf, count);					\
61	spiderpci_io_flush(iowa_mem_find_bus(addr));			\
62}
63
64SPIDER_PCI_MMIO_READ(readb, u8)
65SPIDER_PCI_MMIO_READ(readw, u16)
66SPIDER_PCI_MMIO_READ(readl, u32)
67SPIDER_PCI_MMIO_READ(readq, u64)
68SPIDER_PCI_MMIO_READ(readw_be, u16)
69SPIDER_PCI_MMIO_READ(readl_be, u32)
70SPIDER_PCI_MMIO_READ(readq_be, u64)
71SPIDER_PCI_MMIO_READ_STR(readsb)
72SPIDER_PCI_MMIO_READ_STR(readsw)
73SPIDER_PCI_MMIO_READ_STR(readsl)
74
75static void spiderpci_memcpy_fromio(void *dest, const PCI_IO_ADDR src,
76				    unsigned long n)
77{
78	__do_memcpy_fromio(dest, src, n);
79	spiderpci_io_flush(iowa_mem_find_bus(src));
80}
81
82static int __init spiderpci_pci_setup_chip(struct pci_controller *phb,
83					   void __iomem *regs)
84{
85	void *dummy_page_va;
86	dma_addr_t dummy_page_da;
87
88#ifdef SPIDER_PCI_DISABLE_PREFETCH
89	u32 val = in_be32(regs + SPIDER_PCI_VCI_CNTL_STAT);
90	pr_debug("SPIDER_IOWA:PVCI_Control_Status was 0x%08x\n", val);
91	out_be32(regs + SPIDER_PCI_VCI_CNTL_STAT, val | 0x8);
92#endif /* SPIDER_PCI_DISABLE_PREFETCH */
93
94	/* setup dummy read */
95	/*
96	 * On CellBlade, we can't know that which XDR memory is used by
97	 * kmalloc() to allocate dummy_page_va.
98	 * In order to imporve the performance, the XDR which is used to
99	 * allocate dummy_page_va is the nearest the spider-pci.
100	 * We have to select the CBE which is the nearest the spider-pci
101	 * to allocate memory from the best XDR, but I don't know that
102	 * how to do.
103	 *
104	 * Celleb does not have this problem, because it has only one XDR.
105	 */
106	dummy_page_va = kmalloc(PAGE_SIZE, GFP_KERNEL);
107	if (!dummy_page_va) {
108		pr_err("SPIDERPCI-IOWA:Alloc dummy_page_va failed.\n");
109		return -1;
110	}
111
112	dummy_page_da = dma_map_single(phb->parent, dummy_page_va,
113				       PAGE_SIZE, DMA_FROM_DEVICE);
114	if (dma_mapping_error(phb->parent, dummy_page_da)) {
115		pr_err("SPIDER-IOWA:Map dummy page filed.\n");
116		kfree(dummy_page_va);
117		return -1;
118	}
119
120	out_be32(regs + SPIDER_PCI_DUMMY_READ_BASE, dummy_page_da);
121
122	return 0;
123}
124
125int __init spiderpci_iowa_init(struct iowa_bus *bus, void *data)
126{
127	void __iomem *regs = NULL;
128	struct spiderpci_iowa_private *priv;
129	struct device_node *np = bus->phb->dn;
130	struct resource r;
131	unsigned long offset = (unsigned long)data;
132
133	pr_debug("SPIDERPCI-IOWA:Bus initialize for spider(%s)\n",
134		 np->full_name);
135
136	priv = kzalloc(sizeof(struct spiderpci_iowa_private), GFP_KERNEL);
137	if (!priv) {
138		pr_err("SPIDERPCI-IOWA:"
139		       "Can't allocate struct spiderpci_iowa_private");
140		return -1;
141	}
142
143	if (of_address_to_resource(np, 0, &r)) {
144		pr_err("SPIDERPCI-IOWA:Can't get resource.\n");
145		goto error;
146	}
147
148	regs = ioremap(r.start + offset, SPIDER_PCI_REG_SIZE);
149	if (!regs) {
150		pr_err("SPIDERPCI-IOWA:ioremap failed.\n");
151		goto error;
152	}
153	priv->regs = regs;
154	bus->private = priv;
155
156	if (spiderpci_pci_setup_chip(bus->phb, regs))
157		goto error;
158
159	return 0;
160
161error:
162	kfree(priv);
163	bus->private = NULL;
164
165	if (regs)
166		iounmap(regs);
167
168	return -1;
169}
170
171struct ppc_pci_io spiderpci_ops = {
172	.readb = spiderpci_readb,
173	.readw = spiderpci_readw,
174	.readl = spiderpci_readl,
175	.readq = spiderpci_readq,
176	.readw_be = spiderpci_readw_be,
177	.readl_be = spiderpci_readl_be,
178	.readq_be = spiderpci_readq_be,
179	.readsb = spiderpci_readsb,
180	.readsw = spiderpci_readsw,
181	.readsl = spiderpci_readsl,
182	.memcpy_fromio = spiderpci_memcpy_fromio,
183};
184
185