Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 1 | /* |
Arnd Bergmann | f3f66f5 | 2005-10-31 20:08:37 -0500 | [diff] [blame] | 2 | * IOMMU implementation for Cell Broadband Processor Architecture |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 3 | * |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 4 | * (C) Copyright IBM Corporation 2006-2008 |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 5 | * |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 6 | * Author: Jeremy Kerr <jk@ozlabs.org> |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 7 | * |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2, or (at your option) |
| 11 | * any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 21 | */ |
| 22 | |
| 23 | #undef DEBUG |
| 24 | |
| 25 | #include <linux/kernel.h> |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 26 | #include <linux/init.h> |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/notifier.h> |
Michael Ellerman | ccd05d0 | 2008-02-08 16:37:02 +1100 | [diff] [blame] | 29 | #include <linux/of.h> |
Jon Loeliger | d8caf74 | 2007-11-13 11:10:58 -0600 | [diff] [blame] | 30 | #include <linux/of_platform.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 31 | #include <linux/slab.h> |
David S. Miller | d9b2b2a | 2008-02-13 16:56:49 -0800 | [diff] [blame] | 32 | #include <linux/lmb.h> |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 33 | |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 34 | #include <asm/prom.h> |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 35 | #include <asm/iommu.h> |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 36 | #include <asm/machdep.h> |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 37 | #include <asm/pci-bridge.h> |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 38 | #include <asm/udbg.h> |
Ishizaki Kou | 9858ee8 | 2007-12-04 19:38:24 +1100 | [diff] [blame] | 39 | #include <asm/firmware.h> |
Benjamin Herrenschmidt | eef686a0 | 2007-10-04 15:40:42 +1000 | [diff] [blame] | 40 | #include <asm/cell-regs.h> |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 41 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 42 | #include "interrupt.h" |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 43 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 44 | /* Define CELL_IOMMU_REAL_UNMAP to actually unmap non-used pages |
| 45 | * instead of leaving them mapped to some dummy page. This can be |
| 46 | * enabled once the appropriate workarounds for spider bugs have |
| 47 | * been enabled |
| 48 | */ |
| 49 | #define CELL_IOMMU_REAL_UNMAP |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 50 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 51 | /* Define CELL_IOMMU_STRICT_PROTECTION to enforce protection of |
| 52 | * IO PTEs based on the transfer direction. That can be enabled |
| 53 | * once spider-net has been fixed to pass the correct direction |
| 54 | * to the DMA mapping functions |
| 55 | */ |
| 56 | #define CELL_IOMMU_STRICT_PROTECTION |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 57 | |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 58 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 59 | #define NR_IOMMUS 2 |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 60 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 61 | /* IOC mmap registers */ |
| 62 | #define IOC_Reg_Size 0x2000 |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 63 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 64 | #define IOC_IOPT_CacheInvd 0x908 |
| 65 | #define IOC_IOPT_CacheInvd_NE_Mask 0xffe0000000000000ul |
| 66 | #define IOC_IOPT_CacheInvd_IOPTE_Mask 0x000003fffffffff8ul |
| 67 | #define IOC_IOPT_CacheInvd_Busy 0x0000000000000001ul |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 68 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 69 | #define IOC_IOST_Origin 0x918 |
| 70 | #define IOC_IOST_Origin_E 0x8000000000000000ul |
| 71 | #define IOC_IOST_Origin_HW 0x0000000000000800ul |
| 72 | #define IOC_IOST_Origin_HL 0x0000000000000400ul |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 73 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 74 | #define IOC_IO_ExcpStat 0x920 |
| 75 | #define IOC_IO_ExcpStat_V 0x8000000000000000ul |
| 76 | #define IOC_IO_ExcpStat_SPF_Mask 0x6000000000000000ul |
| 77 | #define IOC_IO_ExcpStat_SPF_S 0x6000000000000000ul |
Jeremy Kerr | 2a7d55f | 2009-03-19 16:46:35 +0000 | [diff] [blame] | 78 | #define IOC_IO_ExcpStat_SPF_P 0x2000000000000000ul |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 79 | #define IOC_IO_ExcpStat_ADDR_Mask 0x00000007fffff000ul |
| 80 | #define IOC_IO_ExcpStat_RW_Mask 0x0000000000000800ul |
| 81 | #define IOC_IO_ExcpStat_IOID_Mask 0x00000000000007fful |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 82 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 83 | #define IOC_IO_ExcpMask 0x928 |
| 84 | #define IOC_IO_ExcpMask_SFE 0x4000000000000000ul |
| 85 | #define IOC_IO_ExcpMask_PFE 0x2000000000000000ul |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 86 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 87 | #define IOC_IOCmd_Offset 0x1000 |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 88 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 89 | #define IOC_IOCmd_Cfg 0xc00 |
| 90 | #define IOC_IOCmd_Cfg_TE 0x0000800000000000ul |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 91 | |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 92 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 93 | /* Segment table entries */ |
| 94 | #define IOSTE_V 0x8000000000000000ul /* valid */ |
| 95 | #define IOSTE_H 0x4000000000000000ul /* cache hint */ |
| 96 | #define IOSTE_PT_Base_RPN_Mask 0x3ffffffffffff000ul /* base RPN of IOPT */ |
| 97 | #define IOSTE_NPPT_Mask 0x0000000000000fe0ul /* no. pages in IOPT */ |
| 98 | #define IOSTE_PS_Mask 0x0000000000000007ul /* page size */ |
| 99 | #define IOSTE_PS_4K 0x0000000000000001ul /* - 4kB */ |
| 100 | #define IOSTE_PS_64K 0x0000000000000003ul /* - 64kB */ |
| 101 | #define IOSTE_PS_1M 0x0000000000000005ul /* - 1MB */ |
| 102 | #define IOSTE_PS_16M 0x0000000000000007ul /* - 16MB */ |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 103 | |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 104 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 105 | /* IOMMU sizing */ |
| 106 | #define IO_SEGMENT_SHIFT 28 |
Michael Ellerman | 225d490 | 2008-02-29 18:33:27 +1100 | [diff] [blame] | 107 | #define IO_PAGENO_BITS(shift) (IO_SEGMENT_SHIFT - (shift)) |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 108 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 109 | /* The high bit needs to be set on every DMA address */ |
| 110 | #define SPIDER_DMA_OFFSET 0x80000000ul |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 111 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 112 | struct iommu_window { |
| 113 | struct list_head list; |
| 114 | struct cbe_iommu *iommu; |
| 115 | unsigned long offset; |
| 116 | unsigned long size; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 117 | unsigned int ioid; |
| 118 | struct iommu_table table; |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 119 | }; |
| 120 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 121 | #define NAMESIZE 8 |
| 122 | struct cbe_iommu { |
| 123 | int nid; |
| 124 | char name[NAMESIZE]; |
| 125 | void __iomem *xlate_regs; |
| 126 | void __iomem *cmd_regs; |
| 127 | unsigned long *stab; |
| 128 | unsigned long *ptab; |
| 129 | void *pad_page; |
| 130 | struct list_head windows; |
| 131 | }; |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 132 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 133 | /* Static array of iommus, one per node |
| 134 | * each contains a list of windows, keyed from dma_window property |
| 135 | * - on bus setup, look for a matching window, or create one |
| 136 | * - on dev setup, assign iommu_table ptr |
| 137 | */ |
| 138 | static struct cbe_iommu iommus[NR_IOMMUS]; |
| 139 | static int cbe_nr_iommus; |
| 140 | |
| 141 | static void invalidate_tce_cache(struct cbe_iommu *iommu, unsigned long *pte, |
| 142 | long n_ptes) |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 143 | { |
Ingo Molnar | b36ac9e | 2009-01-06 14:03:44 +0000 | [diff] [blame] | 144 | u64 __iomem *reg; |
| 145 | u64 val; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 146 | long n; |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 147 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 148 | reg = iommu->xlate_regs + IOC_IOPT_CacheInvd; |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 149 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 150 | while (n_ptes > 0) { |
| 151 | /* we can invalidate up to 1 << 11 PTEs at once */ |
| 152 | n = min(n_ptes, 1l << 11); |
| 153 | val = (((n /*- 1*/) << 53) & IOC_IOPT_CacheInvd_NE_Mask) |
| 154 | | (__pa(pte) & IOC_IOPT_CacheInvd_IOPTE_Mask) |
| 155 | | IOC_IOPT_CacheInvd_Busy; |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 156 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 157 | out_be64(reg, val); |
| 158 | while (in_be64(reg) & IOC_IOPT_CacheInvd_Busy) |
| 159 | ; |
| 160 | |
| 161 | n_ptes -= n; |
| 162 | pte += n; |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 163 | } |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 164 | } |
| 165 | |
Robert Jennings | 6490c49 | 2008-07-24 04:31:16 +1000 | [diff] [blame] | 166 | static int tce_build_cell(struct iommu_table *tbl, long index, long npages, |
Mark Nelson | 4f3dd8a | 2008-07-16 05:51:47 +1000 | [diff] [blame] | 167 | unsigned long uaddr, enum dma_data_direction direction, |
| 168 | struct dma_attrs *attrs) |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 169 | { |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 170 | int i; |
| 171 | unsigned long *io_pte, base_pte; |
| 172 | struct iommu_window *window = |
| 173 | container_of(tbl, struct iommu_window, table); |
Benjamin Herrenschmidt | 12d04ee | 2006-11-11 17:25:02 +1100 | [diff] [blame] | 174 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 175 | /* implementing proper protection causes problems with the spidernet |
| 176 | * driver - check mapping directions later, but allow read & write by |
| 177 | * default for now.*/ |
| 178 | #ifdef CELL_IOMMU_STRICT_PROTECTION |
| 179 | /* to avoid referencing a global, we use a trick here to setup the |
| 180 | * protection bit. "prot" is setup to be 3 fields of 4 bits apprended |
| 181 | * together for each of the 3 supported direction values. It is then |
| 182 | * shifted left so that the fields matching the desired direction |
| 183 | * lands on the appropriate bits, and other bits are masked out. |
| 184 | */ |
| 185 | const unsigned long prot = 0xc48; |
| 186 | base_pte = |
Geert Uytterhoeven | 5c6fc8d | 2009-06-10 04:38:45 +0000 | [diff] [blame] | 187 | ((prot << (52 + 4 * direction)) & |
| 188 | (CBE_IOPTE_PP_W | CBE_IOPTE_PP_R)) | |
| 189 | CBE_IOPTE_M | CBE_IOPTE_SO_RW | |
| 190 | (window->ioid & CBE_IOPTE_IOID_Mask); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 191 | #else |
Geert Uytterhoeven | 5c6fc8d | 2009-06-10 04:38:45 +0000 | [diff] [blame] | 192 | base_pte = CBE_IOPTE_PP_W | CBE_IOPTE_PP_R | CBE_IOPTE_M | |
| 193 | CBE_IOPTE_SO_RW | (window->ioid & CBE_IOPTE_IOID_Mask); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 194 | #endif |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 195 | if (unlikely(dma_get_attr(DMA_ATTR_WEAK_ORDERING, attrs))) |
Geert Uytterhoeven | 5c6fc8d | 2009-06-10 04:38:45 +0000 | [diff] [blame] | 196 | base_pte &= ~CBE_IOPTE_SO_RW; |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 197 | |
Michael Ellerman | 0d7386e | 2008-02-29 18:33:23 +1100 | [diff] [blame] | 198 | io_pte = (unsigned long *)tbl->it_base + (index - tbl->it_offset); |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 199 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 200 | for (i = 0; i < npages; i++, uaddr += IOMMU_PAGE_SIZE) |
Geert Uytterhoeven | 5c6fc8d | 2009-06-10 04:38:45 +0000 | [diff] [blame] | 201 | io_pte[i] = base_pte | (__pa(uaddr) & CBE_IOPTE_RPN_Mask); |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 202 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 203 | mb(); |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 204 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 205 | invalidate_tce_cache(window->iommu, io_pte, npages); |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 206 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 207 | pr_debug("tce_build_cell(index=%lx,n=%lx,dir=%d,base_pte=%lx)\n", |
| 208 | index, npages, direction, base_pte); |
Robert Jennings | 6490c49 | 2008-07-24 04:31:16 +1000 | [diff] [blame] | 209 | return 0; |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 210 | } |
| 211 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 212 | static void tce_free_cell(struct iommu_table *tbl, long index, long npages) |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 213 | { |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 214 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 215 | int i; |
| 216 | unsigned long *io_pte, pte; |
| 217 | struct iommu_window *window = |
| 218 | container_of(tbl, struct iommu_window, table); |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 219 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 220 | pr_debug("tce_free_cell(index=%lx,n=%lx)\n", index, npages); |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 221 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 222 | #ifdef CELL_IOMMU_REAL_UNMAP |
| 223 | pte = 0; |
| 224 | #else |
| 225 | /* spider bridge does PCI reads after freeing - insert a mapping |
| 226 | * to a scratch page instead of an invalid entry */ |
Geert Uytterhoeven | 5c6fc8d | 2009-06-10 04:38:45 +0000 | [diff] [blame] | 227 | pte = CBE_IOPTE_PP_R | CBE_IOPTE_M | CBE_IOPTE_SO_RW | |
| 228 | __pa(window->iommu->pad_page) | |
| 229 | (window->ioid & CBE_IOPTE_IOID_Mask); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 230 | #endif |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 231 | |
Michael Ellerman | 0d7386e | 2008-02-29 18:33:23 +1100 | [diff] [blame] | 232 | io_pte = (unsigned long *)tbl->it_base + (index - tbl->it_offset); |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 233 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 234 | for (i = 0; i < npages; i++) |
| 235 | io_pte[i] = pte; |
| 236 | |
| 237 | mb(); |
| 238 | |
| 239 | invalidate_tce_cache(window->iommu, io_pte, npages); |
| 240 | } |
| 241 | |
| 242 | static irqreturn_t ioc_interrupt(int irq, void *data) |
| 243 | { |
Jeremy Kerr | 2a7d55f | 2009-03-19 16:46:35 +0000 | [diff] [blame] | 244 | unsigned long stat, spf; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 245 | struct cbe_iommu *iommu = data; |
| 246 | |
| 247 | stat = in_be64(iommu->xlate_regs + IOC_IO_ExcpStat); |
Jeremy Kerr | 2a7d55f | 2009-03-19 16:46:35 +0000 | [diff] [blame] | 248 | spf = stat & IOC_IO_ExcpStat_SPF_Mask; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 249 | |
| 250 | /* Might want to rate limit it */ |
| 251 | printk(KERN_ERR "iommu: DMA exception 0x%016lx\n", stat); |
| 252 | printk(KERN_ERR " V=%d, SPF=[%c%c], RW=%s, IOID=0x%04x\n", |
| 253 | !!(stat & IOC_IO_ExcpStat_V), |
Jeremy Kerr | 2a7d55f | 2009-03-19 16:46:35 +0000 | [diff] [blame] | 254 | (spf == IOC_IO_ExcpStat_SPF_S) ? 'S' : ' ', |
| 255 | (spf == IOC_IO_ExcpStat_SPF_P) ? 'P' : ' ', |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 256 | (stat & IOC_IO_ExcpStat_RW_Mask) ? "Read" : "Write", |
| 257 | (unsigned int)(stat & IOC_IO_ExcpStat_IOID_Mask)); |
| 258 | printk(KERN_ERR " page=0x%016lx\n", |
| 259 | stat & IOC_IO_ExcpStat_ADDR_Mask); |
| 260 | |
| 261 | /* clear interrupt */ |
| 262 | stat &= ~IOC_IO_ExcpStat_V; |
| 263 | out_be64(iommu->xlate_regs + IOC_IO_ExcpStat, stat); |
| 264 | |
| 265 | return IRQ_HANDLED; |
| 266 | } |
| 267 | |
| 268 | static int cell_iommu_find_ioc(int nid, unsigned long *base) |
| 269 | { |
| 270 | struct device_node *np; |
| 271 | struct resource r; |
| 272 | |
| 273 | *base = 0; |
| 274 | |
| 275 | /* First look for new style /be nodes */ |
| 276 | for_each_node_by_name(np, "ioc") { |
| 277 | if (of_node_to_nid(np) != nid) |
| 278 | continue; |
| 279 | if (of_address_to_resource(np, 0, &r)) { |
| 280 | printk(KERN_ERR "iommu: can't get address for %s\n", |
| 281 | np->full_name); |
| 282 | continue; |
| 283 | } |
| 284 | *base = r.start; |
| 285 | of_node_put(np); |
| 286 | return 0; |
| 287 | } |
| 288 | |
| 289 | /* Ok, let's try the old way */ |
| 290 | for_each_node_by_type(np, "cpu") { |
| 291 | const unsigned int *nidp; |
| 292 | const unsigned long *tmp; |
| 293 | |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 294 | nidp = of_get_property(np, "node-id", NULL); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 295 | if (nidp && *nidp == nid) { |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 296 | tmp = of_get_property(np, "ioc-translation", NULL); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 297 | if (tmp) { |
| 298 | *base = *tmp; |
| 299 | of_node_put(np); |
| 300 | return 0; |
| 301 | } |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | return -ENODEV; |
| 306 | } |
| 307 | |
Michael Ellerman | 7d432ff | 2008-02-29 18:33:25 +1100 | [diff] [blame] | 308 | static void cell_iommu_setup_stab(struct cbe_iommu *iommu, |
Michael Ellerman | 4134791 | 2008-01-30 01:14:01 +1100 | [diff] [blame] | 309 | unsigned long dbase, unsigned long dsize, |
| 310 | unsigned long fbase, unsigned long fsize) |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 311 | { |
| 312 | struct page *page; |
Michael Ellerman | 7d432ff | 2008-02-29 18:33:25 +1100 | [diff] [blame] | 313 | unsigned long segments, stab_size; |
Michael Ellerman | 4134791 | 2008-01-30 01:14:01 +1100 | [diff] [blame] | 314 | |
| 315 | segments = max(dbase + dsize, fbase + fsize) >> IO_SEGMENT_SHIFT; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 316 | |
Michael Ellerman | 7d432ff | 2008-02-29 18:33:25 +1100 | [diff] [blame] | 317 | pr_debug("%s: iommu[%d]: segments: %lu\n", |
Harvey Harrison | e48b1b4 | 2008-03-29 08:21:07 +1100 | [diff] [blame] | 318 | __func__, iommu->nid, segments); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 319 | |
| 320 | /* set up the segment table */ |
Michael Ellerman | 3ca6644 | 2008-01-21 18:01:43 +1100 | [diff] [blame] | 321 | stab_size = segments * sizeof(unsigned long); |
| 322 | page = alloc_pages_node(iommu->nid, GFP_KERNEL, get_order(stab_size)); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 323 | BUG_ON(!page); |
| 324 | iommu->stab = page_address(page); |
Michael Ellerman | 7d432ff | 2008-02-29 18:33:25 +1100 | [diff] [blame] | 325 | memset(iommu->stab, 0, stab_size); |
| 326 | } |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 327 | |
Michael Ellerman | 7d432ff | 2008-02-29 18:33:25 +1100 | [diff] [blame] | 328 | static unsigned long *cell_iommu_alloc_ptab(struct cbe_iommu *iommu, |
| 329 | unsigned long base, unsigned long size, unsigned long gap_base, |
Michael Ellerman | 225d490 | 2008-02-29 18:33:27 +1100 | [diff] [blame] | 330 | unsigned long gap_size, unsigned long page_shift) |
Michael Ellerman | 7d432ff | 2008-02-29 18:33:25 +1100 | [diff] [blame] | 331 | { |
| 332 | struct page *page; |
| 333 | int i; |
| 334 | unsigned long reg, segments, pages_per_segment, ptab_size, |
| 335 | n_pte_pages, start_seg, *ptab; |
| 336 | |
| 337 | start_seg = base >> IO_SEGMENT_SHIFT; |
| 338 | segments = size >> IO_SEGMENT_SHIFT; |
Michael Ellerman | 225d490 | 2008-02-29 18:33:27 +1100 | [diff] [blame] | 339 | pages_per_segment = 1ull << IO_PAGENO_BITS(page_shift); |
| 340 | /* PTEs for each segment must start on a 4K bounday */ |
| 341 | pages_per_segment = max(pages_per_segment, |
| 342 | (1 << 12) / sizeof(unsigned long)); |
Michael Ellerman | 7d432ff | 2008-02-29 18:33:25 +1100 | [diff] [blame] | 343 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 344 | ptab_size = segments * pages_per_segment * sizeof(unsigned long); |
Harvey Harrison | e48b1b4 | 2008-03-29 08:21:07 +1100 | [diff] [blame] | 345 | pr_debug("%s: iommu[%d]: ptab_size: %lu, order: %d\n", __func__, |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 346 | iommu->nid, ptab_size, get_order(ptab_size)); |
| 347 | page = alloc_pages_node(iommu->nid, GFP_KERNEL, get_order(ptab_size)); |
| 348 | BUG_ON(!page); |
| 349 | |
Michael Ellerman | 7d432ff | 2008-02-29 18:33:25 +1100 | [diff] [blame] | 350 | ptab = page_address(page); |
| 351 | memset(ptab, 0, ptab_size); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 352 | |
Michael Ellerman | 3d3e6da | 2008-02-29 18:33:26 +1100 | [diff] [blame] | 353 | /* number of 4K pages needed for a page table */ |
| 354 | n_pte_pages = (pages_per_segment * sizeof(unsigned long)) >> 12; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 355 | |
| 356 | pr_debug("%s: iommu[%d]: stab at %p, ptab at %p, n_pte_pages: %lu\n", |
Harvey Harrison | e48b1b4 | 2008-03-29 08:21:07 +1100 | [diff] [blame] | 357 | __func__, iommu->nid, iommu->stab, ptab, |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 358 | n_pte_pages); |
| 359 | |
| 360 | /* initialise the STEs */ |
| 361 | reg = IOSTE_V | ((n_pte_pages - 1) << 5); |
| 362 | |
Michael Ellerman | 225d490 | 2008-02-29 18:33:27 +1100 | [diff] [blame] | 363 | switch (page_shift) { |
| 364 | case 12: reg |= IOSTE_PS_4K; break; |
| 365 | case 16: reg |= IOSTE_PS_64K; break; |
| 366 | case 20: reg |= IOSTE_PS_1M; break; |
| 367 | case 24: reg |= IOSTE_PS_16M; break; |
| 368 | default: BUG(); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 369 | } |
| 370 | |
Michael Ellerman | 7d432ff | 2008-02-29 18:33:25 +1100 | [diff] [blame] | 371 | gap_base = gap_base >> IO_SEGMENT_SHIFT; |
| 372 | gap_size = gap_size >> IO_SEGMENT_SHIFT; |
| 373 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 374 | pr_debug("Setting up IOMMU stab:\n"); |
Michael Ellerman | 7d432ff | 2008-02-29 18:33:25 +1100 | [diff] [blame] | 375 | for (i = start_seg; i < (start_seg + segments); i++) { |
| 376 | if (i >= gap_base && i < (gap_base + gap_size)) { |
| 377 | pr_debug("\toverlap at %d, skipping\n", i); |
| 378 | continue; |
| 379 | } |
Michael Ellerman | 3d3e6da | 2008-02-29 18:33:26 +1100 | [diff] [blame] | 380 | iommu->stab[i] = reg | (__pa(ptab) + (n_pte_pages << 12) * |
| 381 | (i - start_seg)); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 382 | pr_debug("\t[%d] 0x%016lx\n", i, iommu->stab[i]); |
| 383 | } |
Michael Ellerman | 7d432ff | 2008-02-29 18:33:25 +1100 | [diff] [blame] | 384 | |
| 385 | return ptab; |
Michael Ellerman | 7fc67af | 2008-01-30 01:14:00 +1100 | [diff] [blame] | 386 | } |
| 387 | |
| 388 | static void cell_iommu_enable_hardware(struct cbe_iommu *iommu) |
| 389 | { |
| 390 | int ret; |
| 391 | unsigned long reg, xlate_base; |
| 392 | unsigned int virq; |
| 393 | |
| 394 | if (cell_iommu_find_ioc(iommu->nid, &xlate_base)) |
| 395 | panic("%s: missing IOC register mappings for node %d\n", |
Harvey Harrison | e48b1b4 | 2008-03-29 08:21:07 +1100 | [diff] [blame] | 396 | __func__, iommu->nid); |
Michael Ellerman | 7fc67af | 2008-01-30 01:14:00 +1100 | [diff] [blame] | 397 | |
| 398 | iommu->xlate_regs = ioremap(xlate_base, IOC_Reg_Size); |
| 399 | iommu->cmd_regs = iommu->xlate_regs + IOC_IOCmd_Offset; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 400 | |
| 401 | /* ensure that the STEs have updated */ |
| 402 | mb(); |
| 403 | |
| 404 | /* setup interrupts for the iommu. */ |
| 405 | reg = in_be64(iommu->xlate_regs + IOC_IO_ExcpStat); |
| 406 | out_be64(iommu->xlate_regs + IOC_IO_ExcpStat, |
| 407 | reg & ~IOC_IO_ExcpStat_V); |
| 408 | out_be64(iommu->xlate_regs + IOC_IO_ExcpMask, |
| 409 | IOC_IO_ExcpMask_PFE | IOC_IO_ExcpMask_SFE); |
| 410 | |
| 411 | virq = irq_create_mapping(NULL, |
| 412 | IIC_IRQ_IOEX_ATI | (iommu->nid << IIC_IRQ_NODE_SHIFT)); |
| 413 | BUG_ON(virq == NO_IRQ); |
| 414 | |
| 415 | ret = request_irq(virq, ioc_interrupt, IRQF_DISABLED, |
| 416 | iommu->name, iommu); |
| 417 | BUG_ON(ret); |
| 418 | |
| 419 | /* set the IOC segment table origin register (and turn on the iommu) */ |
| 420 | reg = IOC_IOST_Origin_E | __pa(iommu->stab) | IOC_IOST_Origin_HW; |
| 421 | out_be64(iommu->xlate_regs + IOC_IOST_Origin, reg); |
| 422 | in_be64(iommu->xlate_regs + IOC_IOST_Origin); |
| 423 | |
| 424 | /* turn on IO translation */ |
| 425 | reg = in_be64(iommu->cmd_regs + IOC_IOCmd_Cfg) | IOC_IOCmd_Cfg_TE; |
| 426 | out_be64(iommu->cmd_regs + IOC_IOCmd_Cfg, reg); |
| 427 | } |
| 428 | |
Michael Ellerman | 7fc67af | 2008-01-30 01:14:00 +1100 | [diff] [blame] | 429 | static void cell_iommu_setup_hardware(struct cbe_iommu *iommu, |
| 430 | unsigned long base, unsigned long size) |
| 431 | { |
Michael Ellerman | 7d432ff | 2008-02-29 18:33:25 +1100 | [diff] [blame] | 432 | cell_iommu_setup_stab(iommu, base, size, 0, 0); |
Michael Ellerman | 225d490 | 2008-02-29 18:33:27 +1100 | [diff] [blame] | 433 | iommu->ptab = cell_iommu_alloc_ptab(iommu, base, size, 0, 0, |
| 434 | IOMMU_PAGE_SHIFT); |
Michael Ellerman | 7fc67af | 2008-01-30 01:14:00 +1100 | [diff] [blame] | 435 | cell_iommu_enable_hardware(iommu); |
| 436 | } |
| 437 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 438 | #if 0/* Unused for now */ |
| 439 | static struct iommu_window *find_window(struct cbe_iommu *iommu, |
| 440 | unsigned long offset, unsigned long size) |
| 441 | { |
| 442 | struct iommu_window *window; |
| 443 | |
| 444 | /* todo: check for overlapping (but not equal) windows) */ |
| 445 | |
| 446 | list_for_each_entry(window, &(iommu->windows), list) { |
| 447 | if (window->offset == offset && window->size == size) |
| 448 | return window; |
| 449 | } |
| 450 | |
| 451 | return NULL; |
| 452 | } |
| 453 | #endif |
| 454 | |
Michael Ellerman | c96b512 | 2008-01-30 01:14:02 +1100 | [diff] [blame] | 455 | static inline u32 cell_iommu_get_ioid(struct device_node *np) |
| 456 | { |
| 457 | const u32 *ioid; |
| 458 | |
| 459 | ioid = of_get_property(np, "ioid", NULL); |
| 460 | if (ioid == NULL) { |
| 461 | printk(KERN_WARNING "iommu: missing ioid for %s using 0\n", |
| 462 | np->full_name); |
| 463 | return 0; |
| 464 | } |
| 465 | |
| 466 | return *ioid; |
| 467 | } |
| 468 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 469 | static struct iommu_window * __init |
| 470 | cell_iommu_setup_window(struct cbe_iommu *iommu, struct device_node *np, |
| 471 | unsigned long offset, unsigned long size, |
| 472 | unsigned long pte_offset) |
| 473 | { |
| 474 | struct iommu_window *window; |
Michael Ellerman | edf441f | 2008-02-29 18:33:24 +1100 | [diff] [blame] | 475 | struct page *page; |
Michael Ellerman | c96b512 | 2008-01-30 01:14:02 +1100 | [diff] [blame] | 476 | u32 ioid; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 477 | |
Michael Ellerman | c96b512 | 2008-01-30 01:14:02 +1100 | [diff] [blame] | 478 | ioid = cell_iommu_get_ioid(np); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 479 | |
| 480 | window = kmalloc_node(sizeof(*window), GFP_KERNEL, iommu->nid); |
| 481 | BUG_ON(window == NULL); |
| 482 | |
| 483 | window->offset = offset; |
| 484 | window->size = size; |
Michael Ellerman | c96b512 | 2008-01-30 01:14:02 +1100 | [diff] [blame] | 485 | window->ioid = ioid; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 486 | window->iommu = iommu; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 487 | |
| 488 | window->table.it_blocksize = 16; |
| 489 | window->table.it_base = (unsigned long)iommu->ptab; |
| 490 | window->table.it_index = iommu->nid; |
Michael Ellerman | 08e02427 | 2008-02-29 18:33:23 +1100 | [diff] [blame] | 491 | window->table.it_offset = (offset >> IOMMU_PAGE_SHIFT) + pte_offset; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 492 | window->table.it_size = size >> IOMMU_PAGE_SHIFT; |
| 493 | |
| 494 | iommu_init_table(&window->table, iommu->nid); |
| 495 | |
| 496 | pr_debug("\tioid %d\n", window->ioid); |
| 497 | pr_debug("\tblocksize %ld\n", window->table.it_blocksize); |
| 498 | pr_debug("\tbase 0x%016lx\n", window->table.it_base); |
| 499 | pr_debug("\toffset 0x%lx\n", window->table.it_offset); |
| 500 | pr_debug("\tsize %ld\n", window->table.it_size); |
| 501 | |
| 502 | list_add(&window->list, &iommu->windows); |
| 503 | |
| 504 | if (offset != 0) |
| 505 | return window; |
| 506 | |
| 507 | /* We need to map and reserve the first IOMMU page since it's used |
| 508 | * by the spider workaround. In theory, we only need to do that when |
| 509 | * running on spider but it doesn't really matter. |
| 510 | * |
| 511 | * This code also assumes that we have a window that starts at 0, |
| 512 | * which is the case on all spider based blades. |
| 513 | */ |
Michael Ellerman | edf441f | 2008-02-29 18:33:24 +1100 | [diff] [blame] | 514 | page = alloc_pages_node(iommu->nid, GFP_KERNEL, 0); |
| 515 | BUG_ON(!page); |
| 516 | iommu->pad_page = page_address(page); |
| 517 | clear_page(iommu->pad_page); |
| 518 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 519 | __set_bit(0, window->table.it_map); |
| 520 | tce_build_cell(&window->table, window->table.it_offset, 1, |
Mark Nelson | 4f3dd8a | 2008-07-16 05:51:47 +1000 | [diff] [blame] | 521 | (unsigned long)iommu->pad_page, DMA_TO_DEVICE, NULL); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 522 | window->table.it_hint = window->table.it_blocksize; |
| 523 | |
| 524 | return window; |
| 525 | } |
| 526 | |
| 527 | static struct cbe_iommu *cell_iommu_for_node(int nid) |
| 528 | { |
| 529 | int i; |
| 530 | |
| 531 | for (i = 0; i < cbe_nr_iommus; i++) |
| 532 | if (iommus[i].nid == nid) |
| 533 | return &iommus[i]; |
| 534 | return NULL; |
| 535 | } |
| 536 | |
Michael Ellerman | f5d67bd5 | 2008-01-21 16:42:45 +1100 | [diff] [blame] | 537 | static unsigned long cell_dma_direct_offset; |
| 538 | |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 539 | static unsigned long dma_iommu_fixed_base; |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 540 | |
| 541 | /* iommu_fixed_is_weak is set if booted with iommu_fixed=weak */ |
| 542 | static int iommu_fixed_is_weak; |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 543 | |
Mark Nelson | 7e5f810 | 2008-07-05 05:05:44 +1000 | [diff] [blame] | 544 | static struct iommu_table *cell_get_iommu_table(struct device *dev) |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 545 | { |
| 546 | struct iommu_window *window; |
| 547 | struct cbe_iommu *iommu; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 548 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 549 | /* Current implementation uses the first window available in that |
| 550 | * node's iommu. We -might- do something smarter later though it may |
| 551 | * never be necessary |
| 552 | */ |
Becky Bruce | 8fae035 | 2008-09-08 09:09:54 +0000 | [diff] [blame] | 553 | iommu = cell_iommu_for_node(dev_to_node(dev)); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 554 | if (iommu == NULL || list_empty(&iommu->windows)) { |
| 555 | printk(KERN_ERR "iommu: missing iommu for %s (node %d)\n", |
Grant Likely | 58f9b0b | 2010-04-13 16:12:56 -0700 | [diff] [blame] | 556 | dev->of_node ? dev->of_node->full_name : "?", |
Becky Bruce | 8fae035 | 2008-09-08 09:09:54 +0000 | [diff] [blame] | 557 | dev_to_node(dev)); |
Mark Nelson | 7e5f810 | 2008-07-05 05:05:44 +1000 | [diff] [blame] | 558 | return NULL; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 559 | } |
| 560 | window = list_entry(iommu->windows.next, struct iommu_window, list); |
| 561 | |
Mark Nelson | 7e5f810 | 2008-07-05 05:05:44 +1000 | [diff] [blame] | 562 | return &window->table; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 563 | } |
| 564 | |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 565 | /* A coherent allocation implies strong ordering */ |
| 566 | |
| 567 | static void *dma_fixed_alloc_coherent(struct device *dev, size_t size, |
| 568 | dma_addr_t *dma_handle, gfp_t flag) |
| 569 | { |
| 570 | if (iommu_fixed_is_weak) |
| 571 | return iommu_alloc_coherent(dev, cell_get_iommu_table(dev), |
| 572 | size, dma_handle, |
| 573 | device_to_mask(dev), flag, |
Becky Bruce | 8fae035 | 2008-09-08 09:09:54 +0000 | [diff] [blame] | 574 | dev_to_node(dev)); |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 575 | else |
| 576 | return dma_direct_ops.alloc_coherent(dev, size, dma_handle, |
| 577 | flag); |
| 578 | } |
| 579 | |
| 580 | static void dma_fixed_free_coherent(struct device *dev, size_t size, |
| 581 | void *vaddr, dma_addr_t dma_handle) |
| 582 | { |
| 583 | if (iommu_fixed_is_weak) |
| 584 | iommu_free_coherent(cell_get_iommu_table(dev), size, vaddr, |
| 585 | dma_handle); |
| 586 | else |
| 587 | dma_direct_ops.free_coherent(dev, size, vaddr, dma_handle); |
| 588 | } |
| 589 | |
Mark Nelson | f9226d5 | 2008-10-27 20:38:08 +0000 | [diff] [blame] | 590 | static dma_addr_t dma_fixed_map_page(struct device *dev, struct page *page, |
| 591 | unsigned long offset, size_t size, |
| 592 | enum dma_data_direction direction, |
| 593 | struct dma_attrs *attrs) |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 594 | { |
| 595 | if (iommu_fixed_is_weak == dma_get_attr(DMA_ATTR_WEAK_ORDERING, attrs)) |
Mark Nelson | f9226d5 | 2008-10-27 20:38:08 +0000 | [diff] [blame] | 596 | return dma_direct_ops.map_page(dev, page, offset, size, |
| 597 | direction, attrs); |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 598 | else |
Mark Nelson | f9226d5 | 2008-10-27 20:38:08 +0000 | [diff] [blame] | 599 | return iommu_map_page(dev, cell_get_iommu_table(dev), page, |
| 600 | offset, size, device_to_mask(dev), |
| 601 | direction, attrs); |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 602 | } |
| 603 | |
Mark Nelson | f9226d5 | 2008-10-27 20:38:08 +0000 | [diff] [blame] | 604 | static void dma_fixed_unmap_page(struct device *dev, dma_addr_t dma_addr, |
| 605 | size_t size, enum dma_data_direction direction, |
| 606 | struct dma_attrs *attrs) |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 607 | { |
| 608 | if (iommu_fixed_is_weak == dma_get_attr(DMA_ATTR_WEAK_ORDERING, attrs)) |
Mark Nelson | f9226d5 | 2008-10-27 20:38:08 +0000 | [diff] [blame] | 609 | dma_direct_ops.unmap_page(dev, dma_addr, size, direction, |
| 610 | attrs); |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 611 | else |
Mark Nelson | f9226d5 | 2008-10-27 20:38:08 +0000 | [diff] [blame] | 612 | iommu_unmap_page(cell_get_iommu_table(dev), dma_addr, size, |
| 613 | direction, attrs); |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 614 | } |
| 615 | |
| 616 | static int dma_fixed_map_sg(struct device *dev, struct scatterlist *sg, |
| 617 | int nents, enum dma_data_direction direction, |
| 618 | struct dma_attrs *attrs) |
| 619 | { |
| 620 | if (iommu_fixed_is_weak == dma_get_attr(DMA_ATTR_WEAK_ORDERING, attrs)) |
| 621 | return dma_direct_ops.map_sg(dev, sg, nents, direction, attrs); |
| 622 | else |
| 623 | return iommu_map_sg(dev, cell_get_iommu_table(dev), sg, nents, |
| 624 | device_to_mask(dev), direction, attrs); |
| 625 | } |
| 626 | |
| 627 | static void dma_fixed_unmap_sg(struct device *dev, struct scatterlist *sg, |
| 628 | int nents, enum dma_data_direction direction, |
| 629 | struct dma_attrs *attrs) |
| 630 | { |
| 631 | if (iommu_fixed_is_weak == dma_get_attr(DMA_ATTR_WEAK_ORDERING, attrs)) |
| 632 | dma_direct_ops.unmap_sg(dev, sg, nents, direction, attrs); |
| 633 | else |
| 634 | iommu_unmap_sg(cell_get_iommu_table(dev), sg, nents, direction, |
| 635 | attrs); |
| 636 | } |
| 637 | |
| 638 | static int dma_fixed_dma_supported(struct device *dev, u64 mask) |
| 639 | { |
Yang Hongyang | 6a35528 | 2009-04-06 19:01:13 -0700 | [diff] [blame] | 640 | return mask == DMA_BIT_MASK(64); |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 641 | } |
| 642 | |
| 643 | static int dma_set_mask_and_switch(struct device *dev, u64 dma_mask); |
| 644 | |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 645 | struct dma_map_ops dma_iommu_fixed_ops = { |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 646 | .alloc_coherent = dma_fixed_alloc_coherent, |
| 647 | .free_coherent = dma_fixed_free_coherent, |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 648 | .map_sg = dma_fixed_map_sg, |
| 649 | .unmap_sg = dma_fixed_unmap_sg, |
| 650 | .dma_supported = dma_fixed_dma_supported, |
| 651 | .set_dma_mask = dma_set_mask_and_switch, |
Mark Nelson | f9226d5 | 2008-10-27 20:38:08 +0000 | [diff] [blame] | 652 | .map_page = dma_fixed_map_page, |
| 653 | .unmap_page = dma_fixed_unmap_page, |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 654 | }; |
| 655 | |
Michael Ellerman | f9660e8 | 2008-02-29 18:33:22 +1100 | [diff] [blame] | 656 | static void cell_dma_dev_setup_fixed(struct device *dev); |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 657 | |
Michael Ellerman | 8686577 | 2008-01-30 01:14:01 +1100 | [diff] [blame] | 658 | static void cell_dma_dev_setup(struct device *dev) |
| 659 | { |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 660 | /* Order is important here, these are not mutually exclusive */ |
| 661 | if (get_dma_ops(dev) == &dma_iommu_fixed_ops) |
Michael Ellerman | f9660e8 | 2008-02-29 18:33:22 +1100 | [diff] [blame] | 662 | cell_dma_dev_setup_fixed(dev); |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 663 | else if (get_pci_dma_ops() == &dma_iommu_ops) |
Becky Bruce | 738ef42 | 2009-09-21 08:26:35 +0000 | [diff] [blame] | 664 | set_iommu_table_base(dev, cell_get_iommu_table(dev)); |
Michael Ellerman | 8686577 | 2008-01-30 01:14:01 +1100 | [diff] [blame] | 665 | else if (get_pci_dma_ops() == &dma_direct_ops) |
Becky Bruce | 738ef42 | 2009-09-21 08:26:35 +0000 | [diff] [blame] | 666 | set_dma_offset(dev, cell_dma_direct_offset); |
Michael Ellerman | 8686577 | 2008-01-30 01:14:01 +1100 | [diff] [blame] | 667 | else |
| 668 | BUG(); |
| 669 | } |
| 670 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 671 | static void cell_pci_dma_dev_setup(struct pci_dev *dev) |
| 672 | { |
| 673 | cell_dma_dev_setup(&dev->dev); |
| 674 | } |
| 675 | |
| 676 | static int cell_of_bus_notify(struct notifier_block *nb, unsigned long action, |
| 677 | void *data) |
| 678 | { |
| 679 | struct device *dev = data; |
| 680 | |
| 681 | /* We are only intereted in device addition */ |
| 682 | if (action != BUS_NOTIFY_ADD_DEVICE) |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 683 | return 0; |
| 684 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 685 | /* We use the PCI DMA ops */ |
Stephen Rothwell | 5719070 | 2007-03-04 17:02:41 +1100 | [diff] [blame] | 686 | dev->archdata.dma_ops = get_pci_dma_ops(); |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 687 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 688 | cell_dma_dev_setup(dev); |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 689 | |
| 690 | return 0; |
| 691 | } |
| 692 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 693 | static struct notifier_block cell_of_bus_notifier = { |
| 694 | .notifier_call = cell_of_bus_notify |
| 695 | }; |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 696 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 697 | static int __init cell_iommu_get_window(struct device_node *np, |
| 698 | unsigned long *base, |
| 699 | unsigned long *size) |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 700 | { |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 701 | const void *dma_window; |
| 702 | unsigned long index; |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 703 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 704 | /* Use ibm,dma-window if available, else, hard code ! */ |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 705 | dma_window = of_get_property(np, "ibm,dma-window", NULL); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 706 | if (dma_window == NULL) { |
| 707 | *base = 0; |
| 708 | *size = 0x80000000u; |
| 709 | return -ENODEV; |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 710 | } |
| 711 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 712 | of_parse_dma_window(np, dma_window, &index, base, size); |
| 713 | return 0; |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 714 | } |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 715 | |
Michael Ellerman | 209bfbb | 2008-01-30 01:13:59 +1100 | [diff] [blame] | 716 | static struct cbe_iommu * __init cell_iommu_alloc(struct device_node *np) |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 717 | { |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 718 | struct cbe_iommu *iommu; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 719 | int nid, i; |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 720 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 721 | /* Get node ID */ |
| 722 | nid = of_node_to_nid(np); |
| 723 | if (nid < 0) { |
| 724 | printk(KERN_ERR "iommu: failed to get node for %s\n", |
| 725 | np->full_name); |
Michael Ellerman | 209bfbb | 2008-01-30 01:13:59 +1100 | [diff] [blame] | 726 | return NULL; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 727 | } |
| 728 | pr_debug("iommu: setting up iommu for node %d (%s)\n", |
| 729 | nid, np->full_name); |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 730 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 731 | /* XXX todo: If we can have multiple windows on the same IOMMU, which |
| 732 | * isn't the case today, we probably want here to check wether the |
| 733 | * iommu for that node is already setup. |
| 734 | * However, there might be issue with getting the size right so let's |
| 735 | * ignore that for now. We might want to completely get rid of the |
| 736 | * multiple window support since the cell iommu supports per-page ioids |
| 737 | */ |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 738 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 739 | if (cbe_nr_iommus >= NR_IOMMUS) { |
| 740 | printk(KERN_ERR "iommu: too many IOMMUs detected ! (%s)\n", |
| 741 | np->full_name); |
Michael Ellerman | 209bfbb | 2008-01-30 01:13:59 +1100 | [diff] [blame] | 742 | return NULL; |
Jens.Osterkamp@de.ibm.com | 49d65b3 | 2005-12-09 19:04:20 +0100 | [diff] [blame] | 743 | } |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 744 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 745 | /* Init base fields */ |
| 746 | i = cbe_nr_iommus++; |
| 747 | iommu = &iommus[i]; |
Al Viro | 9340b0d | 2007-02-09 16:38:15 +0000 | [diff] [blame] | 748 | iommu->stab = NULL; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 749 | iommu->nid = nid; |
| 750 | snprintf(iommu->name, sizeof(iommu->name), "iommu%d", i); |
| 751 | INIT_LIST_HEAD(&iommu->windows); |
| 752 | |
Michael Ellerman | 209bfbb | 2008-01-30 01:13:59 +1100 | [diff] [blame] | 753 | return iommu; |
| 754 | } |
| 755 | |
| 756 | static void __init cell_iommu_init_one(struct device_node *np, |
| 757 | unsigned long offset) |
| 758 | { |
| 759 | struct cbe_iommu *iommu; |
| 760 | unsigned long base, size; |
| 761 | |
| 762 | iommu = cell_iommu_alloc(np); |
| 763 | if (!iommu) |
| 764 | return; |
| 765 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 766 | /* Obtain a window for it */ |
| 767 | cell_iommu_get_window(np, &base, &size); |
| 768 | |
| 769 | pr_debug("\ttranslating window 0x%lx...0x%lx\n", |
| 770 | base, base + size - 1); |
| 771 | |
| 772 | /* Initialize the hardware */ |
Michael Ellerman | 7fc67af | 2008-01-30 01:14:00 +1100 | [diff] [blame] | 773 | cell_iommu_setup_hardware(iommu, base, size); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 774 | |
| 775 | /* Setup the iommu_table */ |
| 776 | cell_iommu_setup_window(iommu, np, base, size, |
| 777 | offset >> IOMMU_PAGE_SHIFT); |
| 778 | } |
| 779 | |
| 780 | static void __init cell_disable_iommus(void) |
| 781 | { |
| 782 | int node; |
| 783 | unsigned long base, val; |
| 784 | void __iomem *xregs, *cregs; |
| 785 | |
| 786 | /* Make sure IOC translation is disabled on all nodes */ |
| 787 | for_each_online_node(node) { |
| 788 | if (cell_iommu_find_ioc(node, &base)) |
| 789 | continue; |
| 790 | xregs = ioremap(base, IOC_Reg_Size); |
| 791 | if (xregs == NULL) |
| 792 | continue; |
| 793 | cregs = xregs + IOC_IOCmd_Offset; |
| 794 | |
| 795 | pr_debug("iommu: cleaning up iommu on node %d\n", node); |
| 796 | |
| 797 | out_be64(xregs + IOC_IOST_Origin, 0); |
| 798 | (void)in_be64(xregs + IOC_IOST_Origin); |
| 799 | val = in_be64(cregs + IOC_IOCmd_Cfg); |
| 800 | val &= ~IOC_IOCmd_Cfg_TE; |
| 801 | out_be64(cregs + IOC_IOCmd_Cfg, val); |
| 802 | (void)in_be64(cregs + IOC_IOCmd_Cfg); |
| 803 | |
| 804 | iounmap(xregs); |
| 805 | } |
| 806 | } |
| 807 | |
| 808 | static int __init cell_iommu_init_disabled(void) |
| 809 | { |
| 810 | struct device_node *np = NULL; |
| 811 | unsigned long base = 0, size; |
| 812 | |
| 813 | /* When no iommu is present, we use direct DMA ops */ |
Stephen Rothwell | 9874777 | 2007-03-04 16:58:39 +1100 | [diff] [blame] | 814 | set_pci_dma_ops(&dma_direct_ops); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 815 | |
| 816 | /* First make sure all IOC translation is turned off */ |
| 817 | cell_disable_iommus(); |
| 818 | |
| 819 | /* If we have no Axon, we set up the spider DMA magic offset */ |
| 820 | if (of_find_node_by_name(NULL, "axon") == NULL) |
Michael Ellerman | f5d67bd5 | 2008-01-21 16:42:45 +1100 | [diff] [blame] | 821 | cell_dma_direct_offset = SPIDER_DMA_OFFSET; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 822 | |
| 823 | /* Now we need to check to see where the memory is mapped |
| 824 | * in PCI space. We assume that all busses use the same dma |
| 825 | * window which is always the case so far on Cell, thus we |
| 826 | * pick up the first pci-internal node we can find and check |
| 827 | * the DMA window from there. |
| 828 | */ |
| 829 | for_each_node_by_name(np, "axon") { |
| 830 | if (np->parent == NULL || np->parent->parent != NULL) |
| 831 | continue; |
| 832 | if (cell_iommu_get_window(np, &base, &size) == 0) |
| 833 | break; |
| 834 | } |
| 835 | if (np == NULL) { |
| 836 | for_each_node_by_name(np, "pci-internal") { |
| 837 | if (np->parent == NULL || np->parent->parent != NULL) |
| 838 | continue; |
| 839 | if (cell_iommu_get_window(np, &base, &size) == 0) |
| 840 | break; |
| 841 | } |
| 842 | } |
| 843 | of_node_put(np); |
| 844 | |
| 845 | /* If we found a DMA window, we check if it's big enough to enclose |
| 846 | * all of physical memory. If not, we force enable IOMMU |
| 847 | */ |
| 848 | if (np && size < lmb_end_of_DRAM()) { |
| 849 | printk(KERN_WARNING "iommu: force-enabled, dma window" |
Ingo Molnar | fe33332 | 2009-01-06 14:26:03 +0000 | [diff] [blame] | 850 | " (%ldMB) smaller than total memory (%lldMB)\n", |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 851 | size >> 20, lmb_end_of_DRAM() >> 20); |
| 852 | return -ENODEV; |
| 853 | } |
| 854 | |
Michael Ellerman | f5d67bd5 | 2008-01-21 16:42:45 +1100 | [diff] [blame] | 855 | cell_dma_direct_offset += base; |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 856 | |
Michael Ellerman | f5d67bd5 | 2008-01-21 16:42:45 +1100 | [diff] [blame] | 857 | if (cell_dma_direct_offset != 0) |
Michael Ellerman | 110f95c | 2008-01-21 16:42:41 +1100 | [diff] [blame] | 858 | ppc_md.pci_dma_dev_setup = cell_pci_dma_dev_setup; |
| 859 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 860 | printk("iommu: disabled, direct DMA offset is 0x%lx\n", |
Michael Ellerman | f5d67bd5 | 2008-01-21 16:42:45 +1100 | [diff] [blame] | 861 | cell_dma_direct_offset); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 862 | |
| 863 | return 0; |
Arnd Bergmann | ae209cf | 2005-06-23 09:43:54 +1000 | [diff] [blame] | 864 | } |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 865 | |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 866 | /* |
| 867 | * Fixed IOMMU mapping support |
| 868 | * |
| 869 | * This code adds support for setting up a fixed IOMMU mapping on certain |
| 870 | * cell machines. For 64-bit devices this avoids the performance overhead of |
| 871 | * mapping and unmapping pages at runtime. 32-bit devices are unable to use |
| 872 | * the fixed mapping. |
| 873 | * |
| 874 | * The fixed mapping is established at boot, and maps all of physical memory |
| 875 | * 1:1 into device space at some offset. On machines with < 30 GB of memory |
| 876 | * we setup the fixed mapping immediately above the normal IOMMU window. |
| 877 | * |
| 878 | * For example a machine with 4GB of memory would end up with the normal |
| 879 | * IOMMU window from 0-2GB and the fixed mapping window from 2GB to 6GB. In |
| 880 | * this case a 64-bit device wishing to DMA to 1GB would be told to DMA to |
| 881 | * 3GB, plus any offset required by firmware. The firmware offset is encoded |
| 882 | * in the "dma-ranges" property. |
| 883 | * |
| 884 | * On machines with 30GB or more of memory, we are unable to place the fixed |
| 885 | * mapping above the normal IOMMU window as we would run out of address space. |
| 886 | * Instead we move the normal IOMMU window to coincide with the hash page |
| 887 | * table, this region does not need to be part of the fixed mapping as no |
| 888 | * device should ever be DMA'ing to it. We then setup the fixed mapping |
| 889 | * from 0 to 32GB. |
| 890 | */ |
| 891 | |
| 892 | static u64 cell_iommu_get_fixed_address(struct device *dev) |
| 893 | { |
Michael Ellerman | 3a4295d | 2008-03-14 16:47:39 +1100 | [diff] [blame] | 894 | u64 cpu_addr, size, best_size, dev_addr = OF_BAD_ADDR; |
Michael Ellerman | ccd05d0 | 2008-02-08 16:37:02 +1100 | [diff] [blame] | 895 | struct device_node *np; |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 896 | const u32 *ranges = NULL; |
Michael Ellerman | 3a4295d | 2008-03-14 16:47:39 +1100 | [diff] [blame] | 897 | int i, len, best, naddr, nsize, pna, range_size; |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 898 | |
Grant Likely | 58f9b0b | 2010-04-13 16:12:56 -0700 | [diff] [blame] | 899 | np = of_node_get(dev->of_node); |
Michael Ellerman | 3a4295d | 2008-03-14 16:47:39 +1100 | [diff] [blame] | 900 | while (1) { |
| 901 | naddr = of_n_addr_cells(np); |
| 902 | nsize = of_n_size_cells(np); |
Michael Ellerman | ccd05d0 | 2008-02-08 16:37:02 +1100 | [diff] [blame] | 903 | np = of_get_next_parent(np); |
Michael Ellerman | 3a4295d | 2008-03-14 16:47:39 +1100 | [diff] [blame] | 904 | if (!np) |
| 905 | break; |
| 906 | |
| 907 | ranges = of_get_property(np, "dma-ranges", &len); |
| 908 | |
| 909 | /* Ignore empty ranges, they imply no translation required */ |
| 910 | if (ranges && len > 0) |
| 911 | break; |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 912 | } |
| 913 | |
| 914 | if (!ranges) { |
| 915 | dev_dbg(dev, "iommu: no dma-ranges found\n"); |
| 916 | goto out; |
| 917 | } |
| 918 | |
| 919 | len /= sizeof(u32); |
| 920 | |
Michael Ellerman | 3a4295d | 2008-03-14 16:47:39 +1100 | [diff] [blame] | 921 | pna = of_n_addr_cells(np); |
| 922 | range_size = naddr + nsize + pna; |
| 923 | |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 924 | /* dma-ranges format: |
Michael Ellerman | 3a4295d | 2008-03-14 16:47:39 +1100 | [diff] [blame] | 925 | * child addr : naddr cells |
| 926 | * parent addr : pna cells |
| 927 | * size : nsize cells |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 928 | */ |
Michael Ellerman | 3a4295d | 2008-03-14 16:47:39 +1100 | [diff] [blame] | 929 | for (i = 0, best = -1, best_size = 0; i < len; i += range_size) { |
| 930 | cpu_addr = of_translate_dma_address(np, ranges + i + naddr); |
| 931 | size = of_read_number(ranges + i + naddr + pna, nsize); |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 932 | |
| 933 | if (cpu_addr == 0 && size > best_size) { |
| 934 | best = i; |
| 935 | best_size = size; |
| 936 | } |
| 937 | } |
| 938 | |
Michael Ellerman | 3a4295d | 2008-03-14 16:47:39 +1100 | [diff] [blame] | 939 | if (best >= 0) { |
| 940 | dev_addr = of_read_number(ranges + best, naddr); |
| 941 | } else |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 942 | dev_dbg(dev, "iommu: no suitable range found!\n"); |
| 943 | |
| 944 | out: |
| 945 | of_node_put(np); |
| 946 | |
Michael Ellerman | 3a4295d | 2008-03-14 16:47:39 +1100 | [diff] [blame] | 947 | return dev_addr; |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 948 | } |
| 949 | |
| 950 | static int dma_set_mask_and_switch(struct device *dev, u64 dma_mask) |
| 951 | { |
| 952 | if (!dev->dma_mask || !dma_supported(dev, dma_mask)) |
| 953 | return -EIO; |
| 954 | |
Michael Ellerman | 4a8df15 | 2008-02-08 16:37:04 +1100 | [diff] [blame] | 955 | if (dma_mask == DMA_BIT_MASK(64) && |
| 956 | cell_iommu_get_fixed_address(dev) != OF_BAD_ADDR) |
| 957 | { |
| 958 | dev_dbg(dev, "iommu: 64-bit OK, using fixed ops\n"); |
| 959 | set_dma_ops(dev, &dma_iommu_fixed_ops); |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 960 | } else { |
| 961 | dev_dbg(dev, "iommu: not 64-bit, using default ops\n"); |
| 962 | set_dma_ops(dev, get_pci_dma_ops()); |
| 963 | } |
| 964 | |
Michael Ellerman | 4a8df15 | 2008-02-08 16:37:04 +1100 | [diff] [blame] | 965 | cell_dma_dev_setup(dev); |
| 966 | |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 967 | *dev->dma_mask = dma_mask; |
| 968 | |
| 969 | return 0; |
| 970 | } |
| 971 | |
Michael Ellerman | f9660e8 | 2008-02-29 18:33:22 +1100 | [diff] [blame] | 972 | static void cell_dma_dev_setup_fixed(struct device *dev) |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 973 | { |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 974 | u64 addr; |
| 975 | |
| 976 | addr = cell_iommu_get_fixed_address(dev) + dma_iommu_fixed_base; |
Becky Bruce | 738ef42 | 2009-09-21 08:26:35 +0000 | [diff] [blame] | 977 | set_dma_offset(dev, addr); |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 978 | |
Ingo Molnar | fe33332 | 2009-01-06 14:26:03 +0000 | [diff] [blame] | 979 | dev_dbg(dev, "iommu: fixed addr = %llx\n", addr); |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 980 | } |
| 981 | |
Michael Ellerman | da40451 | 2008-02-29 18:33:29 +1100 | [diff] [blame] | 982 | static void insert_16M_pte(unsigned long addr, unsigned long *ptab, |
| 983 | unsigned long base_pte) |
| 984 | { |
| 985 | unsigned long segment, offset; |
| 986 | |
| 987 | segment = addr >> IO_SEGMENT_SHIFT; |
| 988 | offset = (addr >> 24) - (segment << IO_PAGENO_BITS(24)); |
| 989 | ptab = ptab + (segment * (1 << 12) / sizeof(unsigned long)); |
| 990 | |
| 991 | pr_debug("iommu: addr %lx ptab %p segment %lx offset %lx\n", |
| 992 | addr, ptab, segment, offset); |
| 993 | |
Geert Uytterhoeven | 5c6fc8d | 2009-06-10 04:38:45 +0000 | [diff] [blame] | 994 | ptab[offset] = base_pte | (__pa(addr) & CBE_IOPTE_RPN_Mask); |
Michael Ellerman | da40451 | 2008-02-29 18:33:29 +1100 | [diff] [blame] | 995 | } |
| 996 | |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 997 | static void cell_iommu_setup_fixed_ptab(struct cbe_iommu *iommu, |
| 998 | struct device_node *np, unsigned long dbase, unsigned long dsize, |
| 999 | unsigned long fbase, unsigned long fsize) |
| 1000 | { |
Michael Ellerman | da40451 | 2008-02-29 18:33:29 +1100 | [diff] [blame] | 1001 | unsigned long base_pte, uaddr, ioaddr, *ptab; |
Michael Ellerman | 7d432ff | 2008-02-29 18:33:25 +1100 | [diff] [blame] | 1002 | |
Michael Ellerman | da40451 | 2008-02-29 18:33:29 +1100 | [diff] [blame] | 1003 | ptab = cell_iommu_alloc_ptab(iommu, fbase, fsize, dbase, dsize, 24); |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 1004 | |
| 1005 | dma_iommu_fixed_base = fbase; |
| 1006 | |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 1007 | pr_debug("iommu: mapping 0x%lx pages from 0x%lx\n", fsize, fbase); |
| 1008 | |
Geert Uytterhoeven | 5c6fc8d | 2009-06-10 04:38:45 +0000 | [diff] [blame] | 1009 | base_pte = CBE_IOPTE_PP_W | CBE_IOPTE_PP_R | CBE_IOPTE_M | |
| 1010 | (cell_iommu_get_ioid(np) & CBE_IOPTE_IOID_Mask); |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 1011 | |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 1012 | if (iommu_fixed_is_weak) |
| 1013 | pr_info("IOMMU: Using weak ordering for fixed mapping\n"); |
| 1014 | else { |
| 1015 | pr_info("IOMMU: Using strong ordering for fixed mapping\n"); |
Geert Uytterhoeven | 5c6fc8d | 2009-06-10 04:38:45 +0000 | [diff] [blame] | 1016 | base_pte |= CBE_IOPTE_SO_RW; |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 1017 | } |
| 1018 | |
Michael Ellerman | da40451 | 2008-02-29 18:33:29 +1100 | [diff] [blame] | 1019 | for (uaddr = 0; uaddr < fsize; uaddr += (1 << 24)) { |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 1020 | /* Don't touch the dynamic region */ |
Michael Ellerman | da40451 | 2008-02-29 18:33:29 +1100 | [diff] [blame] | 1021 | ioaddr = uaddr + fbase; |
| 1022 | if (ioaddr >= dbase && ioaddr < (dbase + dsize)) { |
Michael Ellerman | f9660e8 | 2008-02-29 18:33:22 +1100 | [diff] [blame] | 1023 | pr_debug("iommu: fixed/dynamic overlap, skipping\n"); |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 1024 | continue; |
| 1025 | } |
Michael Ellerman | da40451 | 2008-02-29 18:33:29 +1100 | [diff] [blame] | 1026 | |
| 1027 | insert_16M_pte(uaddr, ptab, base_pte); |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 1028 | } |
| 1029 | |
| 1030 | mb(); |
| 1031 | } |
| 1032 | |
| 1033 | static int __init cell_iommu_fixed_mapping_init(void) |
| 1034 | { |
| 1035 | unsigned long dbase, dsize, fbase, fsize, hbase, hend; |
| 1036 | struct cbe_iommu *iommu; |
| 1037 | struct device_node *np; |
| 1038 | |
| 1039 | /* The fixed mapping is only supported on axon machines */ |
| 1040 | np = of_find_node_by_name(NULL, "axon"); |
| 1041 | if (!np) { |
| 1042 | pr_debug("iommu: fixed mapping disabled, no axons found\n"); |
| 1043 | return -1; |
| 1044 | } |
| 1045 | |
Michael Ellerman | 0e0b47a | 2008-02-08 16:37:03 +1100 | [diff] [blame] | 1046 | /* We must have dma-ranges properties for fixed mapping to work */ |
Michael Ellerman | ba82efb | 2008-11-12 18:20:40 +0000 | [diff] [blame] | 1047 | np = of_find_node_with_property(NULL, "dma-ranges"); |
Michael Ellerman | 0e0b47a | 2008-02-08 16:37:03 +1100 | [diff] [blame] | 1048 | of_node_put(np); |
| 1049 | |
| 1050 | if (!np) { |
| 1051 | pr_debug("iommu: no dma-ranges found, no fixed mapping\n"); |
| 1052 | return -1; |
| 1053 | } |
| 1054 | |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 1055 | /* The default setup is to have the fixed mapping sit after the |
| 1056 | * dynamic region, so find the top of the largest IOMMU window |
| 1057 | * on any axon, then add the size of RAM and that's our max value. |
| 1058 | * If that is > 32GB we have to do other shennanigans. |
| 1059 | */ |
| 1060 | fbase = 0; |
| 1061 | for_each_node_by_name(np, "axon") { |
| 1062 | cell_iommu_get_window(np, &dbase, &dsize); |
| 1063 | fbase = max(fbase, dbase + dsize); |
| 1064 | } |
| 1065 | |
| 1066 | fbase = _ALIGN_UP(fbase, 1 << IO_SEGMENT_SHIFT); |
| 1067 | fsize = lmb_phys_mem_size(); |
| 1068 | |
Denis Kirjanov | 257d569 | 2010-05-27 04:19:52 +0000 | [diff] [blame] | 1069 | if ((fbase + fsize) <= 0x800000000ul) |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 1070 | hbase = 0; /* use the device tree window */ |
| 1071 | else { |
| 1072 | /* If we're over 32 GB we need to cheat. We can't map all of |
| 1073 | * RAM with the fixed mapping, and also fit the dynamic |
| 1074 | * region. So try to place the dynamic region where the hash |
| 1075 | * table sits, drivers never need to DMA to it, we don't |
| 1076 | * need a fixed mapping for that area. |
| 1077 | */ |
| 1078 | if (!htab_address) { |
| 1079 | pr_debug("iommu: htab is NULL, on LPAR? Huh?\n"); |
| 1080 | return -1; |
| 1081 | } |
| 1082 | hbase = __pa(htab_address); |
| 1083 | hend = hbase + htab_size_bytes; |
| 1084 | |
| 1085 | /* The window must start and end on a segment boundary */ |
| 1086 | if ((hbase != _ALIGN_UP(hbase, 1 << IO_SEGMENT_SHIFT)) || |
| 1087 | (hend != _ALIGN_UP(hend, 1 << IO_SEGMENT_SHIFT))) { |
| 1088 | pr_debug("iommu: hash window not segment aligned\n"); |
| 1089 | return -1; |
| 1090 | } |
| 1091 | |
| 1092 | /* Check the hash window fits inside the real DMA window */ |
| 1093 | for_each_node_by_name(np, "axon") { |
| 1094 | cell_iommu_get_window(np, &dbase, &dsize); |
| 1095 | |
| 1096 | if (hbase < dbase || (hend > (dbase + dsize))) { |
| 1097 | pr_debug("iommu: hash window doesn't fit in" |
| 1098 | "real DMA window\n"); |
| 1099 | return -1; |
| 1100 | } |
| 1101 | } |
| 1102 | |
| 1103 | fbase = 0; |
| 1104 | } |
| 1105 | |
| 1106 | /* Setup the dynamic regions */ |
| 1107 | for_each_node_by_name(np, "axon") { |
| 1108 | iommu = cell_iommu_alloc(np); |
| 1109 | BUG_ON(!iommu); |
| 1110 | |
| 1111 | if (hbase == 0) |
| 1112 | cell_iommu_get_window(np, &dbase, &dsize); |
| 1113 | else { |
| 1114 | dbase = hbase; |
| 1115 | dsize = htab_size_bytes; |
| 1116 | } |
| 1117 | |
Michael Ellerman | 44621be | 2008-02-08 16:37:04 +1100 | [diff] [blame] | 1118 | printk(KERN_DEBUG "iommu: node %d, dynamic window 0x%lx-0x%lx " |
| 1119 | "fixed window 0x%lx-0x%lx\n", iommu->nid, dbase, |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 1120 | dbase + dsize, fbase, fbase + fsize); |
| 1121 | |
Michael Ellerman | 7d432ff | 2008-02-29 18:33:25 +1100 | [diff] [blame] | 1122 | cell_iommu_setup_stab(iommu, dbase, dsize, fbase, fsize); |
Michael Ellerman | 225d490 | 2008-02-29 18:33:27 +1100 | [diff] [blame] | 1123 | iommu->ptab = cell_iommu_alloc_ptab(iommu, dbase, dsize, 0, 0, |
| 1124 | IOMMU_PAGE_SHIFT); |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 1125 | cell_iommu_setup_fixed_ptab(iommu, np, dbase, dsize, |
| 1126 | fbase, fsize); |
| 1127 | cell_iommu_enable_hardware(iommu); |
| 1128 | cell_iommu_setup_window(iommu, np, dbase, dsize, 0); |
| 1129 | } |
| 1130 | |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 1131 | dma_iommu_ops.set_dma_mask = dma_set_mask_and_switch; |
| 1132 | set_pci_dma_ops(&dma_iommu_ops); |
| 1133 | |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 1134 | return 0; |
| 1135 | } |
| 1136 | |
| 1137 | static int iommu_fixed_disabled; |
| 1138 | |
| 1139 | static int __init setup_iommu_fixed(char *str) |
| 1140 | { |
Mark Nelson | 7886250 | 2008-07-24 14:28:48 +1000 | [diff] [blame] | 1141 | struct device_node *pciep; |
| 1142 | |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 1143 | if (strcmp(str, "off") == 0) |
| 1144 | iommu_fixed_disabled = 1; |
| 1145 | |
Mark Nelson | 7886250 | 2008-07-24 14:28:48 +1000 | [diff] [blame] | 1146 | /* If we can find a pcie-endpoint in the device tree assume that |
| 1147 | * we're on a triblade or a CAB so by default the fixed mapping |
| 1148 | * should be set to be weakly ordered; but only if the boot |
| 1149 | * option WASN'T set for strong ordering |
| 1150 | */ |
| 1151 | pciep = of_find_node_by_type(NULL, "pcie-endpoint"); |
| 1152 | |
| 1153 | if (strcmp(str, "weak") == 0 || (pciep && strcmp(str, "strong") != 0)) |
Mark Nelson | 1ed6af7 | 2008-07-18 23:03:34 +1000 | [diff] [blame] | 1154 | iommu_fixed_is_weak = 1; |
| 1155 | |
Mark Nelson | 7886250 | 2008-07-24 14:28:48 +1000 | [diff] [blame] | 1156 | of_node_put(pciep); |
| 1157 | |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 1158 | return 1; |
| 1159 | } |
| 1160 | __setup("iommu_fixed=", setup_iommu_fixed); |
| 1161 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 1162 | static int __init cell_iommu_init(void) |
| 1163 | { |
| 1164 | struct device_node *np; |
| 1165 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 1166 | /* If IOMMU is disabled or we have little enough RAM to not need |
| 1167 | * to enable it, we setup a direct mapping. |
| 1168 | * |
| 1169 | * Note: should we make sure we have the IOMMU actually disabled ? |
| 1170 | */ |
| 1171 | if (iommu_is_off || |
| 1172 | (!iommu_force_on && lmb_end_of_DRAM() <= 0x80000000ull)) |
| 1173 | if (cell_iommu_init_disabled() == 0) |
| 1174 | goto bail; |
| 1175 | |
| 1176 | /* Setup various ppc_md. callbacks */ |
| 1177 | ppc_md.pci_dma_dev_setup = cell_pci_dma_dev_setup; |
| 1178 | ppc_md.tce_build = tce_build_cell; |
| 1179 | ppc_md.tce_free = tce_free_cell; |
| 1180 | |
Michael Ellerman | 99e13912 | 2008-01-30 11:03:44 +1100 | [diff] [blame] | 1181 | if (!iommu_fixed_disabled && cell_iommu_fixed_mapping_init() == 0) |
| 1182 | goto bail; |
| 1183 | |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 1184 | /* Create an iommu for each /axon node. */ |
| 1185 | for_each_node_by_name(np, "axon") { |
| 1186 | if (np->parent == NULL || np->parent->parent != NULL) |
| 1187 | continue; |
| 1188 | cell_iommu_init_one(np, 0); |
| 1189 | } |
| 1190 | |
| 1191 | /* Create an iommu for each toplevel /pci-internal node for |
| 1192 | * old hardware/firmware |
| 1193 | */ |
| 1194 | for_each_node_by_name(np, "pci-internal") { |
| 1195 | if (np->parent == NULL || np->parent->parent != NULL) |
| 1196 | continue; |
| 1197 | cell_iommu_init_one(np, SPIDER_DMA_OFFSET); |
| 1198 | } |
| 1199 | |
| 1200 | /* Setup default PCI iommu ops */ |
Stephen Rothwell | 9874777 | 2007-03-04 16:58:39 +1100 | [diff] [blame] | 1201 | set_pci_dma_ops(&dma_iommu_ops); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 1202 | |
| 1203 | bail: |
| 1204 | /* Register callbacks on OF platform device addition/removal |
| 1205 | * to handle linking them to the right DMA operations |
| 1206 | */ |
| 1207 | bus_register_notifier(&of_platform_bus_type, &cell_of_bus_notifier); |
| 1208 | |
| 1209 | return 0; |
| 1210 | } |
Grant Likely | e25c47f | 2008-01-03 06:14:36 +1100 | [diff] [blame] | 1211 | machine_arch_initcall(cell, cell_iommu_init); |
| 1212 | machine_arch_initcall(celleb_native, cell_iommu_init); |
Jeremy Kerr | 165785e | 2006-11-11 17:25:18 +1100 | [diff] [blame] | 1213 | |