tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Board setup routines for Motorola PrPMC750
3 *
4 * Author: Matt Porter <mporter@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/stddef.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/errno.h>
16#include <linux/reboot.h>
17#include <linux/pci.h>
18#include <linux/kdev_t.h>
19#include <linux/types.h>
20#include <linux/major.h>
21#include <linux/initrd.h>
22#include <linux/console.h>
23#include <linux/delay.h>
24#include <linux/seq_file.h>
25#include <linux/root_dev.h>
26#include <linux/slab.h>
27#include <linux/serial_reg.h>
28
29#include <asm/byteorder.h>
30#include <asm/system.h>
31#include <asm/pgtable.h>
32#include <asm/page.h>
33#include <asm/dma.h>
34#include <asm/io.h>
35#include <asm/irq.h>
36#include <asm/machdep.h>
37#include <asm/pci-bridge.h>
38#include <asm/uaccess.h>
39#include <asm/time.h>
40#include <asm/open_pic.h>
41#include <asm/bootinfo.h>
42#include <asm/hawk.h>
43
44#include "prpmc750.h"
45
46extern unsigned long loops_per_jiffy;
47
48extern void gen550_progress(char *, unsigned short);
49
50static u_char prpmc750_openpic_initsenses[] __initdata =
51{
52 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT0 */
53 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UART */
54 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_DEBUGINT */
55 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HAWK_WDT */
56 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
57 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_ABORT */
58 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT1 */
59 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT2 */
60 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT3 */
61 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTA */
62 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTB */
63 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTC */
64 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTD */
65 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
66 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
67 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
68};
69
70/*
71 * Motorola PrPMC750/PrPMC800 in PrPMCBASE or PrPMC-Carrier
72 * Combined irq tables. Only Base has IDSEL 14, only Carrier has 21 and 22.
73 */
74static inline int
75prpmc_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
76{
77 static char pci_irq_table[][4] =
78 /*
79 * PCI IDSEL/INTPIN->INTLINE
80 * A B C D
81 */
82 {
83 {12, 0, 0, 0}, /* IDSEL 14 - Ethernet, base */
84 {0, 0, 0, 0}, /* IDSEL 15 - unused */
85 {10, 11, 12, 9}, /* IDSEL 16 - PMC A1, PMC1 */
86 {10, 11, 12, 9}, /* IDSEL 17 - PrPMC-A-B, PMC2-B */
87 {11, 12, 9, 10}, /* IDSEL 18 - PMC A1-B, PMC1-B */
88 {0, 0, 0, 0}, /* IDSEL 19 - unused */
89 {9, 10, 11, 12}, /* IDSEL 20 - P2P Bridge */
90 {11, 12, 9, 10}, /* IDSEL 21 - PMC A2, carrier */
91 {12, 9, 10, 11}, /* IDSEL 22 - PMC A2-B, carrier */
92 };
93 const long min_idsel = 14, max_idsel = 22, irqs_per_slot = 4;
94 return PCI_IRQ_TABLE_LOOKUP;
95};
96
97static void __init prpmc750_pcibios_fixup(void)
98{
99 struct pci_dev *dev;
100 unsigned short wtmp;
101
102 /*
103 * Kludge to clean up after PPC6BUG which doesn't
104 * configure the CL5446 VGA card. Also the
105 * resource subsystem doesn't fixup the
106 * PCI mem resources on the CL5446.
107 */
108 if ((dev = pci_get_device(PCI_VENDOR_ID_CIRRUS,
109 PCI_DEVICE_ID_CIRRUS_5446, 0))) {
110 dev->resource[0].start += PRPMC750_PCI_PHY_MEM_OFFSET;
111 dev->resource[0].end += PRPMC750_PCI_PHY_MEM_OFFSET;
112 pci_read_config_word(dev, PCI_COMMAND, &wtmp);
113 pci_write_config_word(dev, PCI_COMMAND, wtmp | 3);
114 /* Enable Color mode in MISC reg */
115 outb(0x03, 0x3c2);
116 /* Select DRAM config reg */
117 outb(0x0f, 0x3c4);
118 /* Set proper DRAM config */
119 outb(0xdf, 0x3c5);
120 pci_dev_put(dev);
121 }
122}
123
124void __init prpmc750_find_bridges(void)
125{
126 struct pci_controller *hose;
127
128 hose = pcibios_alloc_controller();
129 if (!hose)
130 return;
131
132 hose->first_busno = 0;
133 hose->last_busno = 0xff;
134 hose->io_base_virt = (void *)PRPMC750_ISA_IO_BASE;
135 hose->pci_mem_offset = PRPMC750_PCI_PHY_MEM_OFFSET;
136
137 pci_init_resource(&hose->io_resource,
138 PRPMC750_PCI_IO_START,
139 PRPMC750_PCI_IO_END,
140 IORESOURCE_IO, "PCI host bridge");
141
142 pci_init_resource(&hose->mem_resources[0],
143 PRPMC750_PROC_PCI_MEM_START,
144 PRPMC750_PROC_PCI_MEM_END,
145 IORESOURCE_MEM, "PCI host bridge");
146
147 hose->io_space.start = PRPMC750_PCI_IO_START;
148 hose->io_space.end = PRPMC750_PCI_IO_END;
149 hose->mem_space.start = PRPMC750_PCI_MEM_START;
150 hose->mem_space.end = PRPMC750_PCI_MEM_END - HAWK_MPIC_SIZE;
151
152 if (hawk_init(hose, PRPMC750_HAWK_PPC_REG_BASE,
153 PRPMC750_PROC_PCI_MEM_START,
154 PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE,
155 PRPMC750_PROC_PCI_IO_START, PRPMC750_PROC_PCI_IO_END,
156 PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE + 1)
157 != 0) {
158 printk(KERN_CRIT "Could not initialize host bridge\n");
159 }
160
161 hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
162
163 ppc_md.pcibios_fixup = prpmc750_pcibios_fixup;
164 ppc_md.pci_swizzle = common_swizzle;
165 ppc_md.pci_map_irq = prpmc_map_irq;
166}
167static int prpmc750_show_cpuinfo(struct seq_file *m)
168{
169 seq_printf(m, "machine\t\t: PrPMC750\n");
170
171 return 0;
172}
173
174static void __init prpmc750_setup_arch(void)
175{
176 /* init to some ~sane value until calibrate_delay() runs */
177 loops_per_jiffy = 50000000 / HZ;
178
179 /* Lookup PCI host bridges */
180 prpmc750_find_bridges();
181
182#ifdef CONFIG_BLK_DEV_INITRD
183 if (initrd_start)
184 ROOT_DEV = Root_RAM0;
185 else
186#endif
187#ifdef CONFIG_ROOT_NFS
188 ROOT_DEV = Root_NFS;
189#else
190 ROOT_DEV = Root_SDA2;
191#endif
192
193 OpenPIC_InitSenses = prpmc750_openpic_initsenses;
194 OpenPIC_NumInitSenses = sizeof(prpmc750_openpic_initsenses);
195
196 printk(KERN_INFO "Port by MontaVista Software, Inc. "
197 "(source@mvista.com)\n");
198}
199
200/*
201 * Compute the PrPMC750's bus speed using the baud clock as a
202 * reference.
203 */
204static unsigned long __init prpmc750_get_bus_speed(void)
205{
206 unsigned long tbl_start, tbl_end;
207 unsigned long current_state, old_state, bus_speed;
208 unsigned char lcr, dll, dlm;
209 int baud_divisor, count;
210
211 /* Read the UART's baud clock divisor */
212 lcr = readb(PRPMC750_SERIAL_0_LCR);
213 writeb(lcr | UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
214 dll = readb(PRPMC750_SERIAL_0_DLL);
215 dlm = readb(PRPMC750_SERIAL_0_DLM);
216 writeb(lcr & ~UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
217 baud_divisor = (dlm << 8) | dll;
218
219 /*
220 * Use the baud clock divisor and base baud clock
221 * to determine the baud rate and use that as
222 * the number of baud clock edges we use for
223 * the time base sample. Make it half the baud
224 * rate.
225 */
226 count = PRPMC750_BASE_BAUD / (baud_divisor * 16);
227
228 /* Find the first edge of the baud clock */
229 old_state = readb(PRPMC750_STATUS_REG) & PRPMC750_BAUDOUT_MASK;
230 do {
231 current_state = readb(PRPMC750_STATUS_REG) &
232 PRPMC750_BAUDOUT_MASK;
233 } while (old_state == current_state);
234
235 old_state = current_state;
236
237 /* Get the starting time base value */
238 tbl_start = get_tbl();
239
240 /*
241 * Loop until we have found a number of edges equal
242 * to half the count (half the baud rate)
243 */
244 do {
245 do {
246 current_state = readb(PRPMC750_STATUS_REG) &
247 PRPMC750_BAUDOUT_MASK;
248 } while (old_state == current_state);
249 old_state = current_state;
250 } while (--count);
251
252 /* Get the ending time base value */
253 tbl_end = get_tbl();
254
255 /* Compute bus speed */
256 bus_speed = (tbl_end - tbl_start) * 128;
257
258 return bus_speed;
259}
260
261static void __init prpmc750_calibrate_decr(void)
262{
263 unsigned long freq;
264 int divisor = 4;
265
266 freq = prpmc750_get_bus_speed();
267
268 tb_ticks_per_jiffy = freq / (HZ * divisor);
269 tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
270}
271
272static void prpmc750_restart(char *cmd)
273{
274 local_irq_disable();
275 writeb(PRPMC750_MODRST_MASK, PRPMC750_MODRST_REG);
276 while (1) ;
277}
278
279static void prpmc750_halt(void)
280{
281 local_irq_disable();
282 while (1) ;
283}
284
285static void prpmc750_power_off(void)
286{
287 prpmc750_halt();
288}
289
290static void __init prpmc750_init_IRQ(void)
291{
292 openpic_init(0);
293}
294
295/*
296 * Set BAT 3 to map 0xf0000000 to end of physical memory space.
297 */
298static __inline__ void prpmc750_set_bat(void)
299{
300 mb();
301 mtspr(SPRN_DBAT1U, 0xf0001ffe);
302 mtspr(SPRN_DBAT1L, 0xf000002a);
303 mb();
304}
305
306/*
307 * We need to read the Falcon/Hawk memory controller
308 * to properly determine this value
309 */
310static unsigned long __init prpmc750_find_end_of_memory(void)
311{
312 /* Read the memory size from the Hawk SMC */
313 return hawk_get_mem_size(PRPMC750_HAWK_SMC_BASE);
314}
315
316static void __init prpmc750_map_io(void)
317{
318 io_block_mapping(PRPMC750_ISA_IO_BASE, PRPMC750_ISA_IO_BASE,
319 0x10000000, _PAGE_IO);
320#if 0
321 io_block_mapping(0xf0000000, 0xc0000000, 0x08000000, _PAGE_IO);
322#endif
323 io_block_mapping(0xf8000000, 0xf8000000, 0x08000000, _PAGE_IO);
324}
325
326void __init
327platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
328 unsigned long r6, unsigned long r7)
329{
330 parse_bootinfo(find_bootinfo());
331
332 /* Cover the Hawk registers with a BAT */
333 prpmc750_set_bat();
334
335 isa_io_base = PRPMC750_ISA_IO_BASE;
336 isa_mem_base = PRPMC750_ISA_MEM_BASE;
337 pci_dram_offset = PRPMC750_PCI_DRAM_OFFSET;
338
339 ppc_md.setup_arch = prpmc750_setup_arch;
340 ppc_md.show_cpuinfo = prpmc750_show_cpuinfo;
341 ppc_md.init_IRQ = prpmc750_init_IRQ;
342 ppc_md.get_irq = openpic_get_irq;
343
344 ppc_md.find_end_of_memory = prpmc750_find_end_of_memory;
345 ppc_md.setup_io_mappings = prpmc750_map_io;
346
347 ppc_md.restart = prpmc750_restart;
348 ppc_md.power_off = prpmc750_power_off;
349 ppc_md.halt = prpmc750_halt;
350
351 /* PrPMC750 has no timekeeper part */
352 ppc_md.time_init = NULL;
353 ppc_md.get_rtc_time = NULL;
354 ppc_md.set_rtc_time = NULL;
355 ppc_md.calibrate_decr = prpmc750_calibrate_decr;
356
357#ifdef CONFIG_SERIAL_TEXT_DEBUG
358 ppc_md.progress = gen550_progress;
359#endif /* CONFIG_SERIAL_TEXT_DEBUG */
360}