2 * Workaround for device erratum PCI 9.
3 * See Motorola's "XPC826xA Family Device Errata Reference."
4 * The erratum applies to all 8260 family Hip4 processors. It is scheduled
5 * to be fixed in HiP4 Rev C. Erratum PCI 9 states that a simultaneous PCI
6 * inbound write transaction and PCI outbound read transaction can result in a
7 * bus deadlock. The suggested workaround is to use the IDMA controller to
8 * perform all reads from PCI configuration, memory, and I/O space.
10 * Author: andy_lowe@mvista.com
12 * 2003 (c) MontaVista Software, Inc. This file is licensed under
13 * the terms of the GNU General Public License version 2. This program
14 * is licensed "as is" without any warranty of any kind, whether express
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/pci.h>
20 #include <linux/types.h>
21 #include <linux/string.h>
24 #include <asm/pci-bridge.h>
25 #include <asm/machdep.h>
26 #include <asm/byteorder.h>
27 #include <asm/mpc8260.h>
28 #include <asm/immap_cpm2.h>
31 #include "m82xx_pci.h"
33 #ifdef CONFIG_8260_PCI9
34 /*#include <asm/mpc8260_pci9.h>*/ /* included in asm/io.h */
36 #define IDMA_XFER_BUF_SIZE 64 /* size of the IDMA transfer buffer */
38 /* define a structure for the IDMA dpram usage */
39 typedef struct idma_dpram_s {
40 idma_t pram; /* IDMA parameter RAM */
41 u_char xfer_buf[IDMA_XFER_BUF_SIZE]; /* IDMA transfer buffer */
42 idma_bd_t bd; /* buffer descriptor */
45 /* define offsets relative to start of IDMA dpram */
46 #define IDMA_XFER_BUF_OFFSET (sizeof(idma_t))
47 #define IDMA_BD_OFFSET (sizeof(idma_t) + IDMA_XFER_BUF_SIZE)
50 static volatile idma_dpram_t *idma_dpram;
52 /* Exactly one of CONFIG_8260_PCI9_IDMAn must be defined,
53 * where n is 1, 2, 3, or 4. This selects the IDMA channel used for
54 * the PCI9 workaround.
56 #ifdef CONFIG_8260_PCI9_IDMA1
58 #define PROFF_IDMA PROFF_IDMA1_BASE
59 #define IDMA_PAGE CPM_CR_IDMA1_PAGE
60 #define IDMA_SBLOCK CPM_CR_IDMA1_SBLOCK
62 #ifdef CONFIG_8260_PCI9_IDMA2
64 #define PROFF_IDMA PROFF_IDMA2_BASE
65 #define IDMA_PAGE CPM_CR_IDMA2_PAGE
66 #define IDMA_SBLOCK CPM_CR_IDMA2_SBLOCK
68 #ifdef CONFIG_8260_PCI9_IDMA3
70 #define PROFF_IDMA PROFF_IDMA3_BASE
71 #define IDMA_PAGE CPM_CR_IDMA3_PAGE
72 #define IDMA_SBLOCK CPM_CR_IDMA3_SBLOCK
74 #ifdef CONFIG_8260_PCI9_IDMA4
76 #define PROFF_IDMA PROFF_IDMA4_BASE
77 #define IDMA_PAGE CPM_CR_IDMA4_PAGE
78 #define IDMA_SBLOCK CPM_CR_IDMA4_SBLOCK
81 void idma_pci9_init(void)
84 volatile idma_t *pram;
85 volatile im_idma_t *idma_reg;
86 volatile cpm2_map_t *immap = cpm2_immr;
88 /* allocate IDMA dpram */
89 dpram_offset = cpm_dpalloc(sizeof(idma_dpram_t), 64);
90 idma_dpram = cpm_dpram_addr(dpram_offset);
92 /* initialize the IDMA parameter RAM */
93 memset((void *)idma_dpram, 0, sizeof(idma_dpram_t));
94 pram = &idma_dpram->pram;
95 pram->ibase = dpram_offset + IDMA_BD_OFFSET;
96 pram->dpr_buf = dpram_offset + IDMA_XFER_BUF_OFFSET;
100 /* initialize the IDMA_BASE pointer to the IDMA parameter RAM */
101 *((ushort *) &immap->im_dprambase[PROFF_IDMA]) = dpram_offset;
103 /* initialize the IDMA registers */
104 idma_reg = (volatile im_idma_t *) &immap->im_sdma.sdma_idsr1;
105 idma_reg[IDMA_CHAN].idmr = 0; /* mask all IDMA interrupts */
106 idma_reg[IDMA_CHAN].idsr = 0xff; /* clear all event flags */
108 printk("<4>Using IDMA%d for MPC8260 device erratum PCI 9 workaround\n",
114 /* Use the IDMA controller to transfer data from I/O memory to local RAM.
115 * The src address must be a physical address suitable for use by the DMA
116 * controller with no translation. The dst address must be a kernel virtual
117 * address. The dst address is translated to a physical address via
119 * The sinc argument specifies whether or not the source address is incremented
120 * by the DMA controller. The source address is incremented if and only if sinc
121 * is non-zero. The destination address is always incremented since the
122 * destination is always host RAM.
125 idma_pci9_read(u8 *dst, u8 *src, int bytes, int unit_size, int sinc)
128 volatile idma_t *pram = &idma_dpram->pram;
129 volatile idma_bd_t *bd = &idma_dpram->bd;
130 volatile cpm2_map_t *immap = cpm2_immr;
132 local_irq_save(flags);
134 /* initialize IDMA parameter RAM for this transfer */
136 pram->dcm = IDMA_DCM_DMA_WRAP_64 | IDMA_DCM_SINC
137 | IDMA_DCM_DINC | IDMA_DCM_SD_MEM2MEM;
139 pram->dcm = IDMA_DCM_DMA_WRAP_64 | IDMA_DCM_DINC
140 | IDMA_DCM_SD_MEM2MEM;
141 pram->ibdptr = pram->ibase;
142 pram->sts = unit_size;
145 /* initialize the buffer descriptor */
146 bd->dst = virt_to_phys(dst);
147 bd->src = (uint) src;
149 bd->flags = IDMA_BD_V | IDMA_BD_W | IDMA_BD_I | IDMA_BD_L | IDMA_BD_DGBL
150 | IDMA_BD_DBO_BE | IDMA_BD_SBO_BE | IDMA_BD_SDTB;
152 /* issue the START_IDMA command to the CP */
153 while (immap->im_cpm.cp_cpcr & CPM_CR_FLG);
154 immap->im_cpm.cp_cpcr = mk_cr_cmd(IDMA_PAGE, IDMA_SBLOCK, 0,
155 CPM_CR_START_IDMA) | CPM_CR_FLG;
156 while (immap->im_cpm.cp_cpcr & CPM_CR_FLG);
158 /* wait for transfer to complete */
159 while(bd->flags & IDMA_BD_V);
161 local_irq_restore(flags);
166 /* Use the IDMA controller to transfer data from I/O memory to local RAM.
167 * The dst address must be a physical address suitable for use by the DMA
168 * controller with no translation. The src address must be a kernel virtual
169 * address. The src address is translated to a physical address via
171 * The dinc argument specifies whether or not the dest address is incremented
172 * by the DMA controller. The source address is incremented if and only if sinc
173 * is non-zero. The source address is always incremented since the
174 * source is always host RAM.
177 idma_pci9_write(u8 *dst, u8 *src, int bytes, int unit_size, int dinc)
180 volatile idma_t *pram = &idma_dpram->pram;
181 volatile idma_bd_t *bd = &idma_dpram->bd;
182 volatile cpm2_map_t *immap = cpm2_immr;
184 local_irq_save(flags);
186 /* initialize IDMA parameter RAM for this transfer */
188 pram->dcm = IDMA_DCM_DMA_WRAP_64 | IDMA_DCM_SINC
189 | IDMA_DCM_DINC | IDMA_DCM_SD_MEM2MEM;
191 pram->dcm = IDMA_DCM_DMA_WRAP_64 | IDMA_DCM_SINC
192 | IDMA_DCM_SD_MEM2MEM;
193 pram->ibdptr = pram->ibase;
194 pram->sts = unit_size;
197 /* initialize the buffer descriptor */
198 bd->dst = (uint) dst;
199 bd->src = virt_to_phys(src);
201 bd->flags = IDMA_BD_V | IDMA_BD_W | IDMA_BD_I | IDMA_BD_L | IDMA_BD_DGBL
202 | IDMA_BD_DBO_BE | IDMA_BD_SBO_BE | IDMA_BD_SDTB;
204 /* issue the START_IDMA command to the CP */
205 while (immap->im_cpm.cp_cpcr & CPM_CR_FLG);
206 immap->im_cpm.cp_cpcr = mk_cr_cmd(IDMA_PAGE, IDMA_SBLOCK, 0,
207 CPM_CR_START_IDMA) | CPM_CR_FLG;
208 while (immap->im_cpm.cp_cpcr & CPM_CR_FLG);
210 /* wait for transfer to complete */
211 while(bd->flags & IDMA_BD_V);
213 local_irq_restore(flags);
218 /* Same as idma_pci9_read, but 16-bit little-endian byte swapping is performed
219 * if the unit_size is 2, and 32-bit little-endian byte swapping is performed if
220 * the unit_size is 4.
223 idma_pci9_read_le(u8 *dst, u8 *src, int bytes, int unit_size, int sinc)
228 idma_pci9_read(dst, src, bytes, unit_size, sinc);
231 for (i = 0, p = dst; i < bytes; i += 2, p += 2)
235 for (i = 0, p = dst; i < bytes; i += 4, p += 4)
242 EXPORT_SYMBOL(idma_pci9_init);
243 EXPORT_SYMBOL(idma_pci9_read);
244 EXPORT_SYMBOL(idma_pci9_read_le);
246 static inline int is_pci_mem(unsigned long addr)
248 if (addr >= M82xx_PCI_LOWER_MMIO &&
249 addr <= M82xx_PCI_UPPER_MMIO)
251 if (addr >= M82xx_PCI_LOWER_MEM &&
252 addr <= M82xx_PCI_UPPER_MEM)
257 #define is_pci_mem(pa) ( (pa > 0x80000000) && (pa < 0xc0000000))
258 int readb(volatile unsigned char *addr)
261 unsigned long pa = iopa((unsigned long) addr);
266 idma_pci9_read((u8 *)&val, (u8 *)pa, sizeof(val), sizeof(val), 0);
270 int readw(volatile unsigned short *addr)
273 unsigned long pa = iopa((unsigned long) addr);
276 return in_le16(addr);
278 idma_pci9_read((u8 *)&val, (u8 *)pa, sizeof(val), sizeof(val), 0);
282 unsigned readl(volatile unsigned *addr)
285 unsigned long pa = iopa((unsigned long) addr);
288 return in_le32(addr);
290 idma_pci9_read((u8 *)&val, (u8 *)pa, sizeof(val), sizeof(val), 0);
294 int inb(unsigned port)
297 u8 *addr = (u8 *)(port + _IO_BASE);
299 idma_pci9_read((u8 *)&val, (u8 *)addr, sizeof(val), sizeof(val), 0);
303 int inw(unsigned port)
306 u8 *addr = (u8 *)(port + _IO_BASE);
308 idma_pci9_read((u8 *)&val, (u8 *)addr, sizeof(val), sizeof(val), 0);
312 unsigned inl(unsigned port)
315 u8 *addr = (u8 *)(port + _IO_BASE);
317 idma_pci9_read((u8 *)&val, (u8 *)addr, sizeof(val), sizeof(val), 0);
321 void insb(unsigned port, void *buf, int ns)
323 u8 *addr = (u8 *)(port + _IO_BASE);
325 idma_pci9_read((u8 *)buf, (u8 *)addr, ns*sizeof(u8), sizeof(u8), 0);
328 void insw(unsigned port, void *buf, int ns)
330 u8 *addr = (u8 *)(port + _IO_BASE);
332 idma_pci9_read((u8 *)buf, (u8 *)addr, ns*sizeof(u16), sizeof(u16), 0);
335 void insl(unsigned port, void *buf, int nl)
337 u8 *addr = (u8 *)(port + _IO_BASE);
339 idma_pci9_read((u8 *)buf, (u8 *)addr, nl*sizeof(u32), sizeof(u32), 0);
342 void insw_ns(unsigned port, void *buf, int ns)
344 u8 *addr = (u8 *)(port + _IO_BASE);
346 idma_pci9_read((u8 *)buf, (u8 *)addr, ns*sizeof(u16), sizeof(u16), 0);
349 void insl_ns(unsigned port, void *buf, int nl)
351 u8 *addr = (u8 *)(port + _IO_BASE);
353 idma_pci9_read((u8 *)buf, (u8 *)addr, nl*sizeof(u32), sizeof(u32), 0);
356 void *memcpy_fromio(void *dest, unsigned long src, size_t count)
358 unsigned long pa = iopa((unsigned long) src);
361 idma_pci9_read((u8 *)dest, (u8 *)pa, count, 32, 1);
363 memcpy(dest, (void *)src, count);
367 EXPORT_SYMBOL(readb);
368 EXPORT_SYMBOL(readw);
369 EXPORT_SYMBOL(readl);
376 EXPORT_SYMBOL(insw_ns);
377 EXPORT_SYMBOL(insl_ns);
378 EXPORT_SYMBOL(memcpy_fromio);
380 #endif /* ifdef CONFIG_8260_PCI9 */
382 /* Indirect PCI routines adapted from arch/ppc/kernel/indirect_pci.c.
383 * Copyright (C) 1998 Gabriel Paubert.
385 #ifndef CONFIG_8260_PCI9
386 #define cfg_read(val, addr, type, op) *val = op((type)(addr))
388 #define cfg_read(val, addr, type, op) \
389 idma_pci9_read_le((u8*)(val),(u8*)(addr),sizeof(*(val)),sizeof(*(val)),0)
392 #define cfg_write(val, addr, type, op) op((type *)(addr), (val))
394 static int indirect_write_config(struct pci_bus *pbus, unsigned int devfn, int where,
397 struct pci_controller *hose = pbus->sysdata;
399 if (ppc_md.pci_exclude_device)
400 if (ppc_md.pci_exclude_device(pbus->number, devfn))
401 return PCIBIOS_DEVICE_NOT_FOUND;
403 if (hose->set_cfg_type)
404 if (pbus->number != hose->first_busno)
407 out_be32(hose->cfg_addr,
408 (((where & 0xfc) | cfg_type) << 24) | (devfn << 16)
409 | ((pbus->number - hose->bus_offset) << 8) | 0x80);
414 cfg_write(value, hose->cfg_data + (where & 3), u8, out_8);
417 cfg_write(value, hose->cfg_data + (where & 2), u16, out_le16);
420 cfg_write(value, hose->cfg_data + (where & 0), u32, out_le32);
423 return PCIBIOS_SUCCESSFUL;
426 static int indirect_read_config(struct pci_bus *pbus, unsigned int devfn, int where,
427 int size, u32 *value)
429 struct pci_controller *hose = pbus->sysdata;
431 if (ppc_md.pci_exclude_device)
432 if (ppc_md.pci_exclude_device(pbus->number, devfn))
433 return PCIBIOS_DEVICE_NOT_FOUND;
435 if (hose->set_cfg_type)
436 if (pbus->number != hose->first_busno)
439 out_be32(hose->cfg_addr,
440 (((where & 0xfc) | cfg_type) << 24) | (devfn << 16)
441 | ((pbus->number - hose->bus_offset) << 8) | 0x80);
446 cfg_read(value, hose->cfg_data + (where & 3), u8 *, in_8);
449 cfg_read(value, hose->cfg_data + (where & 2), u16 *, in_le16);
452 cfg_read(value, hose->cfg_data + (where & 0), u32 *, in_le32);
455 return PCIBIOS_SUCCESSFUL;
458 static struct pci_ops indirect_pci_ops =
460 .read = indirect_read_config,
461 .write = indirect_write_config,
465 setup_m8260_indirect_pci(struct pci_controller* hose, u32 cfg_addr, u32 cfg_data)
467 hose->ops = &indirect_pci_ops;
468 hose->cfg_addr = (unsigned int *) ioremap(cfg_addr, 4);
469 hose->cfg_data = (unsigned char *) ioremap(cfg_data, 4);