1 /*
2 * arch/arm/mach-ks8695/pci.c
3 *
4 * Copyright (C) 2003, Micrel Semiconductors
5 * Copyright (C) 2006, Greg Ungerer <gerg@snapgear.com>
6 * Copyright (C) 2006, Ben Dooks
7 * Copyright (C) 2007, Andrew Victor
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24 #include <linux/kernel.h>
25 #include <linux/pci.h>
26 #include <linux/mm.h>
27 #include <linux/init.h>
28 #include <linux/irq.h>
29 #include <linux/delay.h>
30 #include <linux/io.h>
31
32 #include <asm/signal.h>
33 #include <asm/mach/pci.h>
34 #include <mach/hardware.h>
35
36 #include <mach/devices.h>
37 #include <mach/regs-pci.h>
38
39
40 static int pci_dbg;
41 static int pci_cfg_dbg;
42
43
ks8695_pci_setupconfig(unsigned int bus_nr,unsigned int devfn,unsigned int where)44 static void ks8695_pci_setupconfig(unsigned int bus_nr, unsigned int devfn, unsigned int where)
45 {
46 unsigned long pbca;
47
48 pbca = PBCA_ENABLE | (where & ~3);
49 pbca |= PCI_SLOT(devfn) << 11 ;
50 pbca |= PCI_FUNC(devfn) << 8;
51 pbca |= bus_nr << 16;
52
53 if (bus_nr == 0) {
54 /* use Type-0 transaction */
55 __raw_writel(pbca, KS8695_PCI_VA + KS8695_PBCA);
56 } else {
57 /* use Type-1 transaction */
58 __raw_writel(pbca | PBCA_TYPE1, KS8695_PCI_VA + KS8695_PBCA);
59 }
60 }
61
62
63 /*
64 * The KS8695 datasheet prohibits anything other than 32bit accesses
65 * to the IO registers, so all our configuration must be done with
66 * 32bit operations, and the correct bit masking and shifting.
67 */
68
ks8695_pci_readconfig(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * value)69 static int ks8695_pci_readconfig(struct pci_bus *bus,
70 unsigned int devfn, int where, int size, u32 *value)
71 {
72 ks8695_pci_setupconfig(bus->number, devfn, where);
73
74 *value = __raw_readl(KS8695_PCI_VA + KS8695_PBCD);
75
76 switch (size) {
77 case 4:
78 break;
79 case 2:
80 *value = *value >> ((where & 2) * 8);
81 *value &= 0xffff;
82 break;
83 case 1:
84 *value = *value >> ((where & 3) * 8);
85 *value &= 0xff;
86 break;
87 }
88
89 if (pci_cfg_dbg) {
90 printk("read: %d,%08x,%02x,%d: %08x (%08x)\n",
91 bus->number, devfn, where, size, *value,
92 __raw_readl(KS8695_PCI_VA + KS8695_PBCD));
93 }
94
95 return PCIBIOS_SUCCESSFUL;
96 }
97
ks8695_pci_writeconfig(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 value)98 static int ks8695_pci_writeconfig(struct pci_bus *bus,
99 unsigned int devfn, int where, int size, u32 value)
100 {
101 unsigned long tmp;
102
103 if (pci_cfg_dbg) {
104 printk("write: %d,%08x,%02x,%d: %08x\n",
105 bus->number, devfn, where, size, value);
106 }
107
108 ks8695_pci_setupconfig(bus->number, devfn, where);
109
110 switch (size) {
111 case 4:
112 __raw_writel(value, KS8695_PCI_VA + KS8695_PBCD);
113 break;
114 case 2:
115 tmp = __raw_readl(KS8695_PCI_VA + KS8695_PBCD);
116 tmp &= ~(0xffff << ((where & 2) * 8));
117 tmp |= value << ((where & 2) * 8);
118
119 __raw_writel(tmp, KS8695_PCI_VA + KS8695_PBCD);
120 break;
121 case 1:
122 tmp = __raw_readl(KS8695_PCI_VA + KS8695_PBCD);
123 tmp &= ~(0xff << ((where & 3) * 8));
124 tmp |= value << ((where & 3) * 8);
125
126 __raw_writel(tmp, KS8695_PCI_VA + KS8695_PBCD);
127 break;
128 }
129
130 return PCIBIOS_SUCCESSFUL;
131 }
132
ks8695_local_writeconfig(int where,u32 value)133 static void ks8695_local_writeconfig(int where, u32 value)
134 {
135 ks8695_pci_setupconfig(0, 0, where);
136 __raw_writel(value, KS8695_PCI_VA + KS8695_PBCD);
137 }
138
139 static struct pci_ops ks8695_pci_ops = {
140 .read = ks8695_pci_readconfig,
141 .write = ks8695_pci_writeconfig,
142 };
143
144 static struct resource pci_mem = {
145 .name = "PCI Memory space",
146 .start = KS8695_PCIMEM_PA,
147 .end = KS8695_PCIMEM_PA + (KS8695_PCIMEM_SIZE - 1),
148 .flags = IORESOURCE_MEM,
149 };
150
151 static struct resource pci_io = {
152 .name = "PCI IO space",
153 .start = KS8695_PCIIO_PA,
154 .end = KS8695_PCIIO_PA + (KS8695_PCIIO_SIZE - 1),
155 .flags = IORESOURCE_IO,
156 };
157
ks8695_pci_setup(int nr,struct pci_sys_data * sys)158 static int __init ks8695_pci_setup(int nr, struct pci_sys_data *sys)
159 {
160 if (nr > 0)
161 return 0;
162
163 request_resource(&iomem_resource, &pci_mem);
164 request_resource(&ioport_resource, &pci_io);
165
166 pci_add_resource_offset(&sys->resources, &pci_io, sys->io_offset);
167 pci_add_resource_offset(&sys->resources, &pci_mem, sys->mem_offset);
168
169 /* Assign and enable processor bridge */
170 ks8695_local_writeconfig(PCI_BASE_ADDRESS_0, KS8695_PCIMEM_PA);
171
172 /* Enable bus-master & Memory Space access */
173 ks8695_local_writeconfig(PCI_COMMAND, PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
174
175 /* Set cache-line size & latency. */
176 ks8695_local_writeconfig(PCI_CACHE_LINE_SIZE, (32 << 8) | (L1_CACHE_BYTES / sizeof(u32)));
177
178 /* Reserve PCI memory space for PCI-AHB resources */
179 if (!request_mem_region(KS8695_PCIMEM_PA, SZ_64M, "PCI-AHB Bridge")) {
180 printk(KERN_ERR "Cannot allocate PCI-AHB Bridge memory.\n");
181 return -EBUSY;
182 }
183
184 return 1;
185 }
186
size_mask(unsigned long size)187 static inline unsigned int size_mask(unsigned long size)
188 {
189 return (~size) + 1;
190 }
191
ks8695_pci_fault(unsigned long addr,unsigned int fsr,struct pt_regs * regs)192 static int ks8695_pci_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
193 {
194 unsigned long pc = instruction_pointer(regs);
195 unsigned long instr = *(unsigned long *)pc;
196 unsigned long cmdstat;
197
198 cmdstat = __raw_readl(KS8695_PCI_VA + KS8695_CRCFCS);
199
200 printk(KERN_ERR "PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx [%s%s%s%s%s]\n",
201 addr, fsr, regs->ARM_pc, regs->ARM_lr,
202 cmdstat & (PCI_STATUS_SIG_TARGET_ABORT << 16) ? "GenTarget" : " ",
203 cmdstat & (PCI_STATUS_REC_TARGET_ABORT << 16) ? "RecvTarget" : " ",
204 cmdstat & (PCI_STATUS_REC_MASTER_ABORT << 16) ? "MasterAbort" : " ",
205 cmdstat & (PCI_STATUS_SIG_SYSTEM_ERROR << 16) ? "SysError" : " ",
206 cmdstat & (PCI_STATUS_DETECTED_PARITY << 16) ? "Parity" : " "
207 );
208
209 __raw_writel(cmdstat, KS8695_PCI_VA + KS8695_CRCFCS);
210
211 /*
212 * If the instruction being executed was a read,
213 * make it look like it read all-ones.
214 */
215 if ((instr & 0x0c100000) == 0x04100000) {
216 int reg = (instr >> 12) & 15;
217 unsigned long val;
218
219 if (instr & 0x00400000)
220 val = 255;
221 else
222 val = -1;
223
224 regs->uregs[reg] = val;
225 regs->ARM_pc += 4;
226 return 0;
227 }
228
229 if ((instr & 0x0e100090) == 0x00100090) {
230 int reg = (instr >> 12) & 15;
231
232 regs->uregs[reg] = -1;
233 regs->ARM_pc += 4;
234 return 0;
235 }
236
237 return 1;
238 }
239
ks8695_pci_preinit(void)240 static void __init ks8695_pci_preinit(void)
241 {
242 /* make software reset to avoid freeze if PCI bus was messed up */
243 __raw_writel(0x80000000, KS8695_PCI_VA + KS8695_PBCS);
244
245 /* stage 1 initialization, subid, subdevice = 0x0001 */
246 __raw_writel(0x00010001, KS8695_PCI_VA + KS8695_CRCSID);
247
248 /* stage 2 initialization */
249 /* prefetch limits with 16 words, retry enable */
250 __raw_writel(0x40000000, KS8695_PCI_VA + KS8695_PBCS);
251
252 /* configure memory mapping */
253 __raw_writel(KS8695_PCIMEM_PA, KS8695_PCI_VA + KS8695_PMBA);
254 __raw_writel(size_mask(KS8695_PCIMEM_SIZE), KS8695_PCI_VA + KS8695_PMBAM);
255 __raw_writel(KS8695_PCIMEM_PA, KS8695_PCI_VA + KS8695_PMBAT);
256 __raw_writel(0, KS8695_PCI_VA + KS8695_PMBAC);
257
258 /* configure IO mapping */
259 __raw_writel(KS8695_PCIIO_PA, KS8695_PCI_VA + KS8695_PIOBA);
260 __raw_writel(size_mask(KS8695_PCIIO_SIZE), KS8695_PCI_VA + KS8695_PIOBAM);
261 __raw_writel(KS8695_PCIIO_PA, KS8695_PCI_VA + KS8695_PIOBAT);
262 __raw_writel(0, KS8695_PCI_VA + KS8695_PIOBAC);
263
264 /* hook in fault handlers */
265 hook_fault_code(8, ks8695_pci_fault, SIGBUS, 0, "external abort on non-linefetch");
266 hook_fault_code(10, ks8695_pci_fault, SIGBUS, 0, "external abort on non-linefetch");
267 }
268
ks8695_show_pciregs(void)269 static void ks8695_show_pciregs(void)
270 {
271 if (!pci_dbg)
272 return;
273
274 printk(KERN_INFO "PCI: CRCFID = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFID));
275 printk(KERN_INFO "PCI: CRCFCS = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFCS));
276 printk(KERN_INFO "PCI: CRCFRV = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFRV));
277 printk(KERN_INFO "PCI: CRCFLT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFLT));
278 printk(KERN_INFO "PCI: CRCBMA = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCBMA));
279 printk(KERN_INFO "PCI: CRCSID = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCSID));
280 printk(KERN_INFO "PCI: CRCFIT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFIT));
281
282 printk(KERN_INFO "PCI: PBM = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PBM));
283 printk(KERN_INFO "PCI: PBCS = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PBCS));
284
285 printk(KERN_INFO "PCI: PMBA = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBA));
286 printk(KERN_INFO "PCI: PMBAC = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAC));
287 printk(KERN_INFO "PCI: PMBAM = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAM));
288 printk(KERN_INFO "PCI: PMBAT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAT));
289
290 printk(KERN_INFO "PCI: PIOBA = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBA));
291 printk(KERN_INFO "PCI: PIOBAC = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAC));
292 printk(KERN_INFO "PCI: PIOBAM = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAM));
293 printk(KERN_INFO "PCI: PIOBAT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAT));
294 }
295
296
297 static struct hw_pci ks8695_pci __initdata = {
298 .nr_controllers = 1,
299 .ops = &ks8695_pci_ops,
300 .preinit = ks8695_pci_preinit,
301 .setup = ks8695_pci_setup,
302 .postinit = NULL,
303 .map_irq = NULL,
304 };
305
ks8695_init_pci(struct ks8695_pci_cfg * cfg)306 void __init ks8695_init_pci(struct ks8695_pci_cfg *cfg)
307 {
308 if (__raw_readl(KS8695_PCI_VA + KS8695_CRCFRV) & CFRV_GUEST) {
309 printk("PCI: KS8695 in guest mode, not initialising\n");
310 return;
311 }
312
313 pcibios_min_io = 0;
314 pcibios_min_mem = 0;
315
316 printk(KERN_INFO "PCI: Initialising\n");
317 ks8695_show_pciregs();
318
319 /* set Mode */
320 __raw_writel(cfg->mode << 29, KS8695_PCI_VA + KS8695_PBM);
321
322 ks8695_pci.map_irq = cfg->map_irq; /* board-specific map_irq method */
323
324 pci_common_init(&ks8695_pci);
325 }
326