Merge master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / arch / ppc / platforms / prpmc800.c
1 /*
2  * arch/ppc/platforms/prpmc800.c
3  *
4  * Author: Dale Farnsworth <dale.farnsworth@mvista.com>
5  *
6  * 2001-2004 (c) MontaVista, Software, Inc.  This file is licensed under
7  * the terms of the GNU General Public License version 2.  This program
8  * is licensed "as is" without any warranty of any kind, whether express
9  * or implied.
10  */
11
12 #include <linux/config.h>
13 #include <linux/stddef.h>
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/errno.h>
17 #include <linux/reboot.h>
18 #include <linux/pci.h>
19 #include <linux/kdev_t.h>
20 #include <linux/types.h>
21 #include <linux/major.h>
22 #include <linux/initrd.h>
23 #include <linux/console.h>
24 #include <linux/delay.h>
25 #include <linux/seq_file.h>
26 #include <linux/ide.h>
27 #include <linux/root_dev.h>
28 #include <linux/harrier_defs.h>
29
30 #include <asm/byteorder.h>
31 #include <asm/system.h>
32 #include <asm/pgtable.h>
33 #include <asm/page.h>
34 #include <asm/dma.h>
35 #include <asm/io.h>
36 #include <asm/irq.h>
37 #include <asm/machdep.h>
38 #include <asm/time.h>
39 #include <asm/pci-bridge.h>
40 #include <asm/open_pic.h>
41 #include <asm/bootinfo.h>
42 #include <asm/harrier.h>
43
44 #include "prpmc800.h"
45
46 #define HARRIER_REVI_REG        (PRPMC800_HARRIER_XCSR_BASE+HARRIER_REVI_OFF)
47 #define HARRIER_UCTL_REG        (PRPMC800_HARRIER_XCSR_BASE+HARRIER_UCTL_OFF)
48 #define HARRIER_MISC_CSR_REG   (PRPMC800_HARRIER_XCSR_BASE+HARRIER_MISC_CSR_OFF)
49 #define HARRIER_IFEVP_REG    (PRPMC800_HARRIER_MPIC_BASE+HARRIER_MPIC_IFEVP_OFF)
50 #define HARRIER_IFEDE_REG    (PRPMC800_HARRIER_MPIC_BASE+HARRIER_MPIC_IFEDE_OFF)
51 #define HARRIER_FEEN_REG        (PRPMC800_HARRIER_XCSR_BASE+HARRIER_FEEN_OFF)
52 #define HARRIER_FEMA_REG        (PRPMC800_HARRIER_XCSR_BASE+HARRIER_FEMA_OFF)
53
54 #define HARRIER_VENI_REG        (PRPMC800_HARRIER_XCSR_BASE + HARRIER_VENI_OFF)
55 #define HARRIER_MISC_CSR        (PRPMC800_HARRIER_XCSR_BASE + \
56                                  HARRIER_MISC_CSR_OFF)
57
58 #define MONARCH (monarch != 0)
59 #define NON_MONARCH (monarch == 0)
60
61 extern int mpic_init(void);
62 extern unsigned long loops_per_jiffy;
63 extern void gen550_progress(char *, unsigned short);
64
65 static int monarch = 0;
66 static int found_self = 0;
67 static int self = 0;
68
69 static u_char prpmc800_openpic_initsenses[] __initdata =
70 {
71    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_HOSTINT0 */
72    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_UNUSED */
73    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_DEBUGINT */
74    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_HARRIER_WDT */
75    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_UNUSED */
76    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_UNUSED */
77    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_HOSTINT1 */
78    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_HOSTINT2 */
79    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_HOSTINT3 */
80    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_PMC_INTA */
81    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_PMC_INTB */
82    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_PMC_INTC */
83    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_PMC_INTD */
84    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_UNUSED */
85    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_UNUSED */
86    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_UNUSED */
87    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_HARRIER_INT (UARTS, ABORT, DMA) */
88 };
89
90 /*
91  * Motorola PrPMC750/PrPMC800 in PrPMCBASE or PrPMC-Carrier
92  * Combined irq tables.  Only Base has IDSEL 14, only Carrier has 21 and 22.
93  */
94 static inline int
95 prpmc_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
96 {
97         static char pci_irq_table[][4] =
98         /*
99          *      PCI IDSEL/INTPIN->INTLINE
100          *      A       B       C       D
101          */
102         {
103                 {12,    0,      0,      0},  /* IDSEL 14 - Ethernet, base */
104                 {0,     0,      0,      0},  /* IDSEL 15 - unused */
105                 {10,    11,     12,     9},  /* IDSEL 16 - PMC A1, PMC1 */
106                 {10,    11,     12,     9},  /* IDSEL 17 - PrPMC-A-B, PMC2-B */
107                 {11,    12,     9,      10}, /* IDSEL 18 - PMC A1-B, PMC1-B */
108                 {0,     0,      0,      0},  /* IDSEL 19 - unused */
109                 {9,     10,     11,     12}, /* IDSEL 20 - P2P Bridge */
110                 {11,    12,     9,      10}, /* IDSEL 21 - PMC A2, carrier */
111                 {12,    9,      10,     11}, /* IDSEL 22 - PMC A2-B, carrier */
112         };
113         const long min_idsel = 14, max_idsel = 22, irqs_per_slot = 4;
114         return PCI_IRQ_TABLE_LOOKUP;
115 };
116
117 static int
118 prpmc_read_config_dword(struct pci_controller *hose, u8 bus, u8 devfn,
119                         int offset, u32 * val)
120 {
121         /* paranoia */
122         if ((hose == NULL) ||
123             (hose->cfg_addr == NULL) || (hose->cfg_data == NULL))
124                 return PCIBIOS_DEVICE_NOT_FOUND;
125
126         out_be32(hose->cfg_addr, ((offset & 0xfc) << 24) | (devfn << 16)
127                  | ((bus - hose->bus_offset) << 8) | 0x80);
128         *val = in_le32((u32 *) (hose->cfg_data + (offset & 3)));
129
130         return PCIBIOS_SUCCESSFUL;
131 }
132
133 #define HARRIER_PCI_VEND_DEV_ID (PCI_VENDOR_ID_MOTOROLA | \
134                                  (PCI_DEVICE_ID_MOTOROLA_HARRIER << 16))
135 static int prpmc_self(u8 bus, u8 devfn)
136 {
137         /*
138          * Harriers always view themselves as being on bus 0. If we're not
139          * looking at bus 0, we're not going to find ourselves.
140          */
141         if (bus != 0)
142                 return PCIBIOS_DEVICE_NOT_FOUND;
143         else {
144                 int result;
145                 int val;
146                 struct pci_controller *hose;
147
148                 hose = pci_bus_to_hose(bus);
149
150                 /* See if target device is a Harrier */
151                 result = prpmc_read_config_dword(hose, bus, devfn,
152                                                  PCI_VENDOR_ID, &val);
153                 if ((result != PCIBIOS_SUCCESSFUL) ||
154                     (val != HARRIER_PCI_VEND_DEV_ID))
155                         return PCIBIOS_DEVICE_NOT_FOUND;
156
157                 /*
158                  * LBA bit is set if target Harrier == initiating Harrier
159                  * (i.e. if we are reading our own PCI header).
160                  */
161                 result = prpmc_read_config_dword(hose, bus, devfn,
162                                                  HARRIER_LBA_OFF, &val);
163                 if ((result != PCIBIOS_SUCCESSFUL) ||
164                     ((val & HARRIER_LBA_MSK) != HARRIER_LBA_MSK))
165                         return PCIBIOS_DEVICE_NOT_FOUND;
166
167                 /* It's us, save our location for later */
168                 self = devfn;
169                 found_self = 1;
170                 return PCIBIOS_SUCCESSFUL;
171         }
172 }
173
174 static int prpmc_exclude_device(u8 bus, u8 devfn)
175 {
176         /*
177          * Monarch is allowed to access all PCI devices. Non-monarch is
178          * only allowed to access its own Harrier.
179          */
180
181         if (MONARCH)
182                 return PCIBIOS_SUCCESSFUL;
183         if (found_self)
184                 if ((bus == 0) && (devfn == self))
185                         return PCIBIOS_SUCCESSFUL;
186                 else
187                         return PCIBIOS_DEVICE_NOT_FOUND;
188         else
189                 return prpmc_self(bus, devfn);
190 }
191
192 void __init prpmc800_find_bridges(void)
193 {
194         struct pci_controller *hose;
195         int host_bridge;
196
197         hose = pcibios_alloc_controller();
198         if (!hose)
199                 return;
200
201         hose->first_busno = 0;
202         hose->last_busno = 0xff;
203
204         ppc_md.pci_exclude_device = prpmc_exclude_device;
205         ppc_md.pcibios_fixup = NULL;
206         ppc_md.pcibios_fixup_bus = NULL;
207         ppc_md.pci_swizzle = common_swizzle;
208         ppc_md.pci_map_irq = prpmc_map_irq;
209
210         setup_indirect_pci(hose,
211                            PRPMC800_PCI_CONFIG_ADDR, PRPMC800_PCI_CONFIG_DATA);
212
213         /* Get host bridge vendor/dev id */
214
215         host_bridge = in_be32((uint *) (HARRIER_VENI_REG));
216
217         if (host_bridge != HARRIER_VEND_DEV_ID) {
218                 printk(KERN_CRIT "Host bridge 0x%x not supported\n",
219                                 host_bridge);
220                 return;
221         }
222
223         monarch = in_be32((uint *) HARRIER_MISC_CSR) & HARRIER_SYSCON;
224
225         printk(KERN_INFO "Running as %s.\n",
226                         MONARCH ? "Monarch" : "Non-Monarch");
227
228         hose->io_space.start = PRPMC800_PCI_IO_START;
229         hose->io_space.end = PRPMC800_PCI_IO_END;
230         hose->io_base_virt = (void *)PRPMC800_ISA_IO_BASE;
231         hose->pci_mem_offset = PRPMC800_PCI_PHY_MEM_OFFSET;
232
233         pci_init_resource(&hose->io_resource,
234                           PRPMC800_PCI_IO_START, PRPMC800_PCI_IO_END,
235                           IORESOURCE_IO, "PCI host bridge");
236
237         if (MONARCH) {
238                 hose->mem_space.start = PRPMC800_PCI_MEM_START;
239                 hose->mem_space.end = PRPMC800_PCI_MEM_END;
240
241                 pci_init_resource(&hose->mem_resources[0],
242                                   PRPMC800_PCI_MEM_START,
243                                   PRPMC800_PCI_MEM_END,
244                                   IORESOURCE_MEM, "PCI host bridge");
245
246                 if (harrier_init(hose,
247                                  PRPMC800_HARRIER_XCSR_BASE,
248                                  PRPMC800_PROC_PCI_MEM_START,
249                                  PRPMC800_PROC_PCI_MEM_END,
250                                  PRPMC800_PROC_PCI_IO_START,
251                                  PRPMC800_PROC_PCI_IO_END,
252                                  PRPMC800_HARRIER_MPIC_BASE) != 0)
253                         printk(KERN_CRIT "Could not initialize HARRIER "
254                                          "bridge\n");
255
256                 harrier_release_eready(PRPMC800_HARRIER_XCSR_BASE);
257                 harrier_wait_eready(PRPMC800_HARRIER_XCSR_BASE);
258                 hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
259
260         } else {
261                 pci_init_resource(&hose->mem_resources[0],
262                                   PRPMC800_NM_PCI_MEM_START,
263                                   PRPMC800_NM_PCI_MEM_END,
264                                   IORESOURCE_MEM, "PCI host bridge");
265
266                 hose->mem_space.start = PRPMC800_NM_PCI_MEM_START;
267                 hose->mem_space.end = PRPMC800_NM_PCI_MEM_END;
268
269                 if (harrier_init(hose,
270                                  PRPMC800_HARRIER_XCSR_BASE,
271                                  PRPMC800_NM_PROC_PCI_MEM_START,
272                                  PRPMC800_NM_PROC_PCI_MEM_END,
273                                  PRPMC800_PROC_PCI_IO_START,
274                                  PRPMC800_PROC_PCI_IO_END,
275                                  PRPMC800_HARRIER_MPIC_BASE) != 0)
276                         printk(KERN_CRIT "Could not initialize HARRIER "
277                                          "bridge\n");
278
279                 harrier_setup_nonmonarch(PRPMC800_HARRIER_XCSR_BASE,
280                                          HARRIER_ITSZ_1MB);
281                 harrier_release_eready(PRPMC800_HARRIER_XCSR_BASE);
282         }
283 }
284
285 static int prpmc800_show_cpuinfo(struct seq_file *m)
286 {
287         seq_printf(m, "machine\t\t: PrPMC800\n");
288
289         return 0;
290 }
291
292 static void __init prpmc800_setup_arch(void)
293 {
294         /* init to some ~sane value until calibrate_delay() runs */
295         loops_per_jiffy = 50000000 / HZ;
296
297         /* Lookup PCI host bridges */
298         prpmc800_find_bridges();
299
300 #ifdef CONFIG_BLK_DEV_INITRD
301         if (initrd_start)
302                 ROOT_DEV = Root_RAM0;
303         else
304 #endif
305 #ifdef CONFIG_ROOT_NFS
306                 ROOT_DEV = Root_NFS;
307 #else
308                 ROOT_DEV = Root_SDA2;
309 #endif
310
311         printk(KERN_INFO "Port by MontaVista Software, Inc. "
312                          "(source@mvista.com)\n");
313 }
314
315 /*
316  * Compute the PrPMC800's tbl frequency using the baud clock as a reference.
317  */
318 static void __init prpmc800_calibrate_decr(void)
319 {
320         unsigned long tbl_start, tbl_end;
321         unsigned long current_state, old_state, tb_ticks_per_second;
322         unsigned int count;
323         unsigned int harrier_revision;
324
325         harrier_revision = readb(HARRIER_REVI_REG);
326         if (harrier_revision < 2) {
327                 /* XTAL64 was broken in harrier revision 1 */
328                 printk(KERN_INFO "time_init: Harrier revision %d, assuming "
329                                  "100 Mhz bus\n", harrier_revision);
330                 tb_ticks_per_second = 100000000 / 4;
331                 tb_ticks_per_jiffy = tb_ticks_per_second / HZ;
332                 tb_to_us = mulhwu_scale_factor(tb_ticks_per_second, 1000000);
333                 return;
334         }
335
336         /*
337          * The XTAL64 bit oscillates at the 1/64 the base baud clock
338          * Set count to XTAL64 cycles per second.  Since we'll count
339          * half-cycles, we'll reach the count in half a second.
340          */
341         count = PRPMC800_BASE_BAUD / 64;
342
343         /* Find the first edge of the baud clock */
344         old_state = readb(HARRIER_UCTL_REG) & HARRIER_XTAL64_MASK;
345         do {
346                 current_state = readb(HARRIER_UCTL_REG) & HARRIER_XTAL64_MASK;
347         } while (old_state == current_state);
348
349         old_state = current_state;
350
351         /* Get the starting time base value */
352         tbl_start = get_tbl();
353
354         /*
355          * Loop until we have found a number of edges (half-cycles)
356          * equal to the count (half a second)
357          */
358         do {
359                 do {
360                         current_state = readb(HARRIER_UCTL_REG) &
361                             HARRIER_XTAL64_MASK;
362                 } while (old_state == current_state);
363                 old_state = current_state;
364         } while (--count);
365
366         /* Get the ending time base value */
367         tbl_end = get_tbl();
368
369         /* We only counted for half a second, so double to get ticks/second */
370         tb_ticks_per_second = (tbl_end - tbl_start) * 2;
371         tb_ticks_per_jiffy = tb_ticks_per_second / HZ;
372         tb_to_us = mulhwu_scale_factor(tb_ticks_per_second, 1000000);
373 }
374
375 static void prpmc800_restart(char *cmd)
376 {
377         ulong temp;
378
379         local_irq_disable();
380         temp = in_be32((uint *) HARRIER_MISC_CSR_REG);
381         temp |= HARRIER_RSTOUT;
382         out_be32((uint *) HARRIER_MISC_CSR_REG, temp);
383         while (1) ;
384 }
385
386 static void prpmc800_halt(void)
387 {
388         local_irq_disable();
389         while (1) ;
390 }
391
392 static void prpmc800_power_off(void)
393 {
394         prpmc800_halt();
395 }
396
397 static void __init prpmc800_init_IRQ(void)
398 {
399         OpenPIC_InitSenses = prpmc800_openpic_initsenses;
400         OpenPIC_NumInitSenses = sizeof(prpmc800_openpic_initsenses);
401
402         /* Setup external interrupt sources. */
403         openpic_set_sources(0, 16, OpenPIC_Addr + 0x10000);
404         /* Setup internal UART interrupt source. */
405         openpic_set_sources(16, 1, OpenPIC_Addr + 0x10200);
406
407         /* Do the MPIC initialization based on the above settings. */
408         openpic_init(0);
409
410         /* enable functional exceptions for uarts and abort */
411         out_8((u8 *) HARRIER_FEEN_REG, (HARRIER_FE_UA0 | HARRIER_FE_UA1));
412         out_8((u8 *) HARRIER_FEMA_REG, ~(HARRIER_FE_UA0 | HARRIER_FE_UA1));
413 }
414
415 /*
416  * Set BAT 3 to map 0xf0000000 to end of physical memory space.
417  */
418 static __inline__ void prpmc800_set_bat(void)
419 {
420         mb();
421         mtspr(SPRN_DBAT1U, 0xf0001ffe);
422         mtspr(SPRN_DBAT1L, 0xf000002a);
423         mb();
424 }
425
426 /*
427  * We need to read the Harrier memory controller
428  * to properly determine this value
429  */
430 static unsigned long __init prpmc800_find_end_of_memory(void)
431 {
432         /* Read the memory size from the Harrier XCSR */
433         return harrier_get_mem_size(PRPMC800_HARRIER_XCSR_BASE);
434 }
435
436 static void __init prpmc800_map_io(void)
437 {
438         io_block_mapping(0x80000000, 0x80000000, 0x10000000, _PAGE_IO);
439         io_block_mapping(0xf0000000, 0xf0000000, 0x10000000, _PAGE_IO);
440 }
441
442 void __init
443 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
444               unsigned long r6, unsigned long r7)
445 {
446         parse_bootinfo(find_bootinfo());
447
448         prpmc800_set_bat();
449
450         isa_io_base = PRPMC800_ISA_IO_BASE;
451         isa_mem_base = PRPMC800_ISA_MEM_BASE;
452         pci_dram_offset = PRPMC800_PCI_DRAM_OFFSET;
453
454         ppc_md.setup_arch = prpmc800_setup_arch;
455         ppc_md.show_cpuinfo = prpmc800_show_cpuinfo;
456         ppc_md.init_IRQ = prpmc800_init_IRQ;
457         ppc_md.get_irq = openpic_get_irq;
458
459         ppc_md.find_end_of_memory = prpmc800_find_end_of_memory;
460         ppc_md.setup_io_mappings = prpmc800_map_io;
461
462         ppc_md.restart = prpmc800_restart;
463         ppc_md.power_off = prpmc800_power_off;
464         ppc_md.halt = prpmc800_halt;
465
466         /* PrPMC800 has no timekeeper part */
467         ppc_md.time_init = NULL;
468         ppc_md.get_rtc_time = NULL;
469         ppc_md.set_rtc_time = NULL;
470         ppc_md.calibrate_decr = prpmc800_calibrate_decr;
471 #ifdef  CONFIG_SERIAL_TEXT_DEBUG
472         ppc_md.progress = gen550_progress;
473 #else                           /* !CONFIG_SERIAL_TEXT_DEBUG */
474         ppc_md.progress = NULL;
475 #endif                          /* CONFIG_SERIAL_TEXT_DEBUG */
476 }