1 /*
2 * Copyright (C) 2005-2008, PA Semi, Inc
3 *
4 * Maintained by: Olof Johansson <olof@lixom.net>
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 version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 #undef DEBUG
21
22 #include <linux/types.h>
23 #include <linux/spinlock.h>
24 #include <linux/pci.h>
25 #include <asm/iommu.h>
26 #include <asm/machdep.h>
27 #include <asm/abs_addr.h>
28 #include <asm/firmware.h>
29
30 #define IOBMAP_PAGE_SHIFT 12
31 #define IOBMAP_PAGE_SIZE (1 << IOBMAP_PAGE_SHIFT)
32 #define IOBMAP_PAGE_MASK (IOBMAP_PAGE_SIZE - 1)
33
34 #define IOB_BASE 0xe0000000
35 #define IOB_SIZE 0x3000
36 /* Configuration registers */
37 #define IOBCAP_REG 0x40
38 #define IOBCOM_REG 0x100
39 /* Enable IOB address translation */
40 #define IOBCOM_ATEN 0x00000100
41
42 /* Address decode configuration register */
43 #define IOB_AD_REG 0x14c
44 /* IOBCOM_AD_REG fields */
45 #define IOB_AD_VGPRT 0x00000e00
46 #define IOB_AD_VGAEN 0x00000100
47 /* Direct mapping settings */
48 #define IOB_AD_MPSEL_MASK 0x00000030
49 #define IOB_AD_MPSEL_B38 0x00000000
50 #define IOB_AD_MPSEL_B40 0x00000010
51 #define IOB_AD_MPSEL_B42 0x00000020
52 /* Translation window size / enable */
53 #define IOB_AD_TRNG_MASK 0x00000003
54 #define IOB_AD_TRNG_256M 0x00000000
55 #define IOB_AD_TRNG_2G 0x00000001
56 #define IOB_AD_TRNG_128G 0x00000003
57
58 #define IOB_TABLEBASE_REG 0x154
59
60 /* Base of the 64 4-byte L1 registers */
61 #define IOB_XLT_L1_REGBASE 0x2b00
62
63 /* Register to invalidate TLB entries */
64 #define IOB_AT_INVAL_TLB_REG 0x2d00
65
66 /* The top two bits of the level 1 entry contains valid and type flags */
67 #define IOBMAP_L1E_V 0x40000000
68 #define IOBMAP_L1E_V_B 0x80000000
69
70 /* For big page entries, the bottom two bits contains flags */
71 #define IOBMAP_L1E_BIG_CACHED 0x00000002
72 #define IOBMAP_L1E_BIG_PRIORITY 0x00000001
73
74 /* For regular level 2 entries, top 2 bits contain valid and cache flags */
75 #define IOBMAP_L2E_V 0x80000000
76 #define IOBMAP_L2E_V_CACHED 0xc0000000
77
78 static void __iomem *iob;
79 static u32 iob_l1_emptyval;
80 static u32 iob_l2_emptyval;
81 static u32 *iob_l2_base;
82
83 static struct iommu_table iommu_table_iobmap;
84 static int iommu_table_iobmap_inited;
85
iobmap_build(struct iommu_table * tbl,long index,long npages,unsigned long uaddr,enum dma_data_direction direction,struct dma_attrs * attrs)86 static int iobmap_build(struct iommu_table *tbl, long index,
87 long npages, unsigned long uaddr,
88 enum dma_data_direction direction,
89 struct dma_attrs *attrs)
90 {
91 u32 *ip;
92 u32 rpn;
93 unsigned long bus_addr;
94
95 pr_debug("iobmap: build at: %lx, %lx, addr: %lx\n", index, npages, uaddr);
96
97 bus_addr = (tbl->it_offset + index) << IOBMAP_PAGE_SHIFT;
98
99 ip = ((u32 *)tbl->it_base) + index;
100
101 while (npages--) {
102 rpn = virt_to_abs(uaddr) >> IOBMAP_PAGE_SHIFT;
103
104 *(ip++) = IOBMAP_L2E_V | rpn;
105 /* invalidate tlb, can be optimized more */
106 out_le32(iob+IOB_AT_INVAL_TLB_REG, bus_addr >> 14);
107
108 uaddr += IOBMAP_PAGE_SIZE;
109 bus_addr += IOBMAP_PAGE_SIZE;
110 }
111 return 0;
112 }
113
114
iobmap_free(struct iommu_table * tbl,long index,long npages)115 static void iobmap_free(struct iommu_table *tbl, long index,
116 long npages)
117 {
118 u32 *ip;
119 unsigned long bus_addr;
120
121 pr_debug("iobmap: free at: %lx, %lx\n", index, npages);
122
123 bus_addr = (tbl->it_offset + index) << IOBMAP_PAGE_SHIFT;
124
125 ip = ((u32 *)tbl->it_base) + index;
126
127 while (npages--) {
128 *(ip++) = iob_l2_emptyval;
129 /* invalidate tlb, can be optimized more */
130 out_le32(iob+IOB_AT_INVAL_TLB_REG, bus_addr >> 14);
131 bus_addr += IOBMAP_PAGE_SIZE;
132 }
133 }
134
135
iommu_table_iobmap_setup(void)136 static void iommu_table_iobmap_setup(void)
137 {
138 pr_debug(" -> %s\n", __func__);
139 iommu_table_iobmap.it_busno = 0;
140 iommu_table_iobmap.it_offset = 0;
141 /* it_size is in number of entries */
142 iommu_table_iobmap.it_size = 0x80000000 >> IOBMAP_PAGE_SHIFT;
143
144 /* Initialize the common IOMMU code */
145 iommu_table_iobmap.it_base = (unsigned long)iob_l2_base;
146 iommu_table_iobmap.it_index = 0;
147 /* XXXOJN tune this to avoid IOB cache invals.
148 * Should probably be 8 (64 bytes)
149 */
150 iommu_table_iobmap.it_blocksize = 4;
151 iommu_init_table(&iommu_table_iobmap, 0);
152 pr_debug(" <- %s\n", __func__);
153 }
154
155
156
pci_dma_bus_setup_pasemi(struct pci_bus * bus)157 static void pci_dma_bus_setup_pasemi(struct pci_bus *bus)
158 {
159 pr_debug("pci_dma_bus_setup, bus %p, bus->self %p\n", bus, bus->self);
160
161 if (!iommu_table_iobmap_inited) {
162 iommu_table_iobmap_inited = 1;
163 iommu_table_iobmap_setup();
164 }
165 }
166
167
pci_dma_dev_setup_pasemi(struct pci_dev * dev)168 static void pci_dma_dev_setup_pasemi(struct pci_dev *dev)
169 {
170 pr_debug("pci_dma_dev_setup, dev %p (%s)\n", dev, pci_name(dev));
171
172 #if !defined(CONFIG_PPC_PASEMI_IOMMU_DMA_FORCE)
173 /* For non-LPAR environment, don't translate anything for the DMA
174 * engine. The exception to this is if the user has enabled
175 * CONFIG_PPC_PASEMI_IOMMU_DMA_FORCE at build time.
176 */
177 if (dev->vendor == 0x1959 && dev->device == 0xa007 &&
178 !firmware_has_feature(FW_FEATURE_LPAR)) {
179 dev->dev.archdata.dma_ops = &dma_direct_ops;
180 return;
181 }
182 #endif
183
184 set_iommu_table_base(&dev->dev, &iommu_table_iobmap);
185 }
186
iob_init(struct device_node * dn)187 int __init iob_init(struct device_node *dn)
188 {
189 unsigned long tmp;
190 u32 regword;
191 int i;
192
193 pr_debug(" -> %s\n", __func__);
194
195 /* Allocate a spare page to map all invalid IOTLB pages. */
196 tmp = memblock_alloc(IOBMAP_PAGE_SIZE, IOBMAP_PAGE_SIZE);
197 if (!tmp)
198 panic("IOBMAP: Cannot allocate spare page!");
199 /* Empty l1 is marked invalid */
200 iob_l1_emptyval = 0;
201 /* Empty l2 is mapped to dummy page */
202 iob_l2_emptyval = IOBMAP_L2E_V | (tmp >> IOBMAP_PAGE_SHIFT);
203
204 iob = ioremap(IOB_BASE, IOB_SIZE);
205 if (!iob)
206 panic("IOBMAP: Cannot map registers!");
207
208 /* setup direct mapping of the L1 entries */
209 for (i = 0; i < 64; i++) {
210 /* Each L1 covers 32MB, i.e. 8K entries = 32K of ram */
211 regword = IOBMAP_L1E_V | (__pa(iob_l2_base + i*0x2000) >> 12);
212 out_le32(iob+IOB_XLT_L1_REGBASE+i*4, regword);
213 }
214
215 /* set 2GB translation window, based at 0 */
216 regword = in_le32(iob+IOB_AD_REG);
217 regword &= ~IOB_AD_TRNG_MASK;
218 regword |= IOB_AD_TRNG_2G;
219 out_le32(iob+IOB_AD_REG, regword);
220
221 /* Enable translation */
222 regword = in_le32(iob+IOBCOM_REG);
223 regword |= IOBCOM_ATEN;
224 out_le32(iob+IOBCOM_REG, regword);
225
226 pr_debug(" <- %s\n", __func__);
227
228 return 0;
229 }
230
231
232 /* These are called very early. */
iommu_init_early_pasemi(void)233 void __init iommu_init_early_pasemi(void)
234 {
235 int iommu_off;
236
237 #ifndef CONFIG_PPC_PASEMI_IOMMU
238 iommu_off = 1;
239 #else
240 iommu_off = of_chosen &&
241 of_get_property(of_chosen, "linux,iommu-off", NULL);
242 #endif
243 if (iommu_off)
244 return;
245
246 iob_init(NULL);
247
248 ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_pasemi;
249 ppc_md.pci_dma_bus_setup = pci_dma_bus_setup_pasemi;
250 ppc_md.tce_build = iobmap_build;
251 ppc_md.tce_free = iobmap_free;
252 set_pci_dma_ops(&dma_iommu_ops);
253 }
254
alloc_iobmap_l2(void)255 void __init alloc_iobmap_l2(void)
256 {
257 #ifndef CONFIG_PPC_PASEMI_IOMMU
258 return;
259 #endif
260 /* For 2G space, 8x64 pages (2^21 bytes) is max total l2 size */
261 iob_l2_base = (u32 *)abs_to_virt(memblock_alloc_base(1UL<<21, 1UL<<21, 0x80000000));
262
263 printk(KERN_INFO "IOBMAP L2 allocated at: %p\n", iob_l2_base);
264 }
265