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/ide.h>
26#include <linux/root_dev.h>
27#include <linux/slab.h>
28#include <linux/serial_reg.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/pci-bridge.h>
39#include <asm/uaccess.h>
40#include <asm/time.h>
41#include <asm/open_pic.h>
42#include <asm/bootinfo.h>
43#include <asm/hawk.h>
44
45#include "prpmc750.h"
46
47extern unsigned long loops_per_jiffy;
48
49extern void gen550_progress(char *, unsigned short);
50
51static u_char prpmc750_openpic_initsenses[] __initdata =
52{
53 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT0 */
54 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UART */
55 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_DEBUGINT */
56 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HAWK_WDT */
57 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
58 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_ABORT */
59 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT1 */
60 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT2 */
61 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT3 */
62 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTA */
63 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTB */
64 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTC */
65 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTD */
66 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
67 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
68 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
69};
70
71/*
72 * Motorola PrPMC750/PrPMC800 in PrPMCBASE or PrPMC-Carrier
73 * Combined irq tables. Only Base has IDSEL 14, only Carrier has 21 and 22.
74 */
75static inline int
76prpmc_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
77{
78 static char pci_irq_table[][4] =
79 /*
80 * PCI IDSEL/INTPIN->INTLINE
81 * A B C D
82 */
83 {
84 {12, 0, 0, 0}, /* IDSEL 14 - Ethernet, base */
85 {0, 0, 0, 0}, /* IDSEL 15 - unused */
86 {10, 11, 12, 9}, /* IDSEL 16 - PMC A1, PMC1 */
87 {10, 11, 12, 9}, /* IDSEL 17 - PrPMC-A-B, PMC2-B */
88 {11, 12, 9, 10}, /* IDSEL 18 - PMC A1-B, PMC1-B */
89 {0, 0, 0, 0}, /* IDSEL 19 - unused */
90 {9, 10, 11, 12}, /* IDSEL 20 - P2P Bridge */
91 {11, 12, 9, 10}, /* IDSEL 21 - PMC A2, carrier */
92 {12, 9, 10, 11}, /* IDSEL 22 - PMC A2-B, carrier */
93 };
94 const long min_idsel = 14, max_idsel = 22, irqs_per_slot = 4;
95 return PCI_IRQ_TABLE_LOOKUP;
96};
97
98static void __init prpmc750_pcibios_fixup(void)
99{
100 struct pci_dev *dev;
101 unsigned short wtmp;
102
103 /*
104 * Kludge to clean up after PPC6BUG which doesn't
105 * configure the CL5446 VGA card. Also the
106 * resource subsystem doesn't fixup the
107 * PCI mem resources on the CL5446.
108 */
109 if ((dev = pci_get_device(PCI_VENDOR_ID_CIRRUS,
110 PCI_DEVICE_ID_CIRRUS_5446, 0))) {
111 dev->resource[0].start += PRPMC750_PCI_PHY_MEM_OFFSET;
112 dev->resource[0].end += PRPMC750_PCI_PHY_MEM_OFFSET;
113 pci_read_config_word(dev, PCI_COMMAND, &wtmp);
114 pci_write_config_word(dev, PCI_COMMAND, wtmp | 3);
115 /* Enable Color mode in MISC reg */
116 outb(0x03, 0x3c2);
117 /* Select DRAM config reg */
118 outb(0x0f, 0x3c4);
119 /* Set proper DRAM config */
120 outb(0xdf, 0x3c5);
121 pci_dev_put(dev);
122 }
123}
124
125void __init prpmc750_find_bridges(void)
126{
127 struct pci_controller *hose;
128
129 hose = pcibios_alloc_controller();
130 if (!hose)
131 return;
132
133 hose->first_busno = 0;
134 hose->last_busno = 0xff;
135 hose->io_base_virt = (void *)PRPMC750_ISA_IO_BASE;
136 hose->pci_mem_offset = PRPMC750_PCI_PHY_MEM_OFFSET;
137
138 pci_init_resource(&hose->io_resource,
139 PRPMC750_PCI_IO_START,
140 PRPMC750_PCI_IO_END,
141 IORESOURCE_IO, "PCI host bridge");
142
143 pci_init_resource(&hose->mem_resources[0],
144 PRPMC750_PROC_PCI_MEM_START,
145 PRPMC750_PROC_PCI_MEM_END,
146 IORESOURCE_MEM, "PCI host bridge");
147
148 hose->io_space.start = PRPMC750_PCI_IO_START;
149 hose->io_space.end = PRPMC750_PCI_IO_END;
150 hose->mem_space.start = PRPMC750_PCI_MEM_START;
151 hose->mem_space.end = PRPMC750_PCI_MEM_END - HAWK_MPIC_SIZE;
152
153 if (hawk_init(hose, PRPMC750_HAWK_PPC_REG_BASE,
154 PRPMC750_PROC_PCI_MEM_START,
155 PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE,
156 PRPMC750_PROC_PCI_IO_START, PRPMC750_PROC_PCI_IO_END,
157 PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE + 1)
158 != 0) {
159 printk(KERN_CRIT "Could not initialize host bridge\n");
160 }
161
162 hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
163
164 ppc_md.pcibios_fixup = prpmc750_pcibios_fixup;
165 ppc_md.pci_swizzle = common_swizzle;
166 ppc_md.pci_map_irq = prpmc_map_irq;
167}
168static int prpmc750_show_cpuinfo(struct seq_file *m)
169{
170 seq_printf(m, "machine\t\t: PrPMC750\n");
171
172 return 0;
173}
174
175static void __init prpmc750_setup_arch(void)
176{
177 /* init to some ~sane value until calibrate_delay() runs */
178 loops_per_jiffy = 50000000 / HZ;
179
180 /* Lookup PCI host bridges */
181 prpmc750_find_bridges();
182
183#ifdef CONFIG_BLK_DEV_INITRD
184 if (initrd_start)
185 ROOT_DEV = Root_RAM0;
186 else
187#endif
188#ifdef CONFIG_ROOT_NFS
189 ROOT_DEV = Root_NFS;
190#else
191 ROOT_DEV = Root_SDA2;
192#endif
193
194 OpenPIC_InitSenses = prpmc750_openpic_initsenses;
195 OpenPIC_NumInitSenses = sizeof(prpmc750_openpic_initsenses);
196
197 printk(KERN_INFO "Port by MontaVista Software, Inc. "
198 "(source@mvista.com)\n");
199}
200
201/*
202 * Compute the PrPMC750's bus speed using the baud clock as a
203 * reference.
204 */
205static unsigned long __init prpmc750_get_bus_speed(void)
206{
207 unsigned long tbl_start, tbl_end;
208 unsigned long current_state, old_state, bus_speed;
209 unsigned char lcr, dll, dlm;
210 int baud_divisor, count;
211
212 /* Read the UART's baud clock divisor */
213 lcr = readb(PRPMC750_SERIAL_0_LCR);
214 writeb(lcr | UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
215 dll = readb(PRPMC750_SERIAL_0_DLL);
216 dlm = readb(PRPMC750_SERIAL_0_DLM);
217 writeb(lcr & ~UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
218 baud_divisor = (dlm << 8) | dll;
219
220 /*
221 * Use the baud clock divisor and base baud clock
222 * to determine the baud rate and use that as
223 * the number of baud clock edges we use for
224 * the time base sample. Make it half the baud
225 * rate.
226 */
227 count = PRPMC750_BASE_BAUD / (baud_divisor * 16);
228
229 /* Find the first edge of the baud clock */
230 old_state = readb(PRPMC750_STATUS_REG) & PRPMC750_BAUDOUT_MASK;
231 do {
232 current_state = readb(PRPMC750_STATUS_REG) &
233 PRPMC750_BAUDOUT_MASK;
234 } while (old_state == current_state);
235
236 old_state = current_state;
237
238 /* Get the starting time base value */
239 tbl_start = get_tbl();
240
241 /*
242 * Loop until we have found a number of edges equal
243 * to half the count (half the baud rate)
244 */
245 do {
246 do {
247 current_state = readb(PRPMC750_STATUS_REG) &
248 PRPMC750_BAUDOUT_MASK;
249 } while (old_state == current_state);
250 old_state = current_state;
251 } while (--count);
252
253 /* Get the ending time base value */
254 tbl_end = get_tbl();
255
256 /* Compute bus speed */
257 bus_speed = (tbl_end - tbl_start) * 128;
258
259 return bus_speed;
260}
261
262static void __init prpmc750_calibrate_decr(void)
263{
264 unsigned long freq;
265 int divisor = 4;
266
267 freq = prpmc750_get_bus_speed();
268
269 tb_ticks_per_jiffy = freq / (HZ * divisor);
270 tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
271}
272
273static void prpmc750_restart(char *cmd)
274{
275 local_irq_disable();
276 writeb(PRPMC750_MODRST_MASK, PRPMC750_MODRST_REG);
277 while (1) ;
278}
279
280static void prpmc750_halt(void)
281{
282 local_irq_disable();
283 while (1) ;
284}
285
286static void prpmc750_power_off(void)
287{
288 prpmc750_halt();
289}
290
291static void __init prpmc750_init_IRQ(void)
292{
293 openpic_init(0);
294}
295
296/*
297 * Set BAT 3 to map 0xf0000000 to end of physical memory space.
298 */
299static __inline__ void prpmc750_set_bat(void)
300{
301 mb();
302 mtspr(SPRN_DBAT1U, 0xf0001ffe);
303 mtspr(SPRN_DBAT1L, 0xf000002a);
304 mb();
305}
306
307/*
308 * We need to read the Falcon/Hawk memory controller
309 * to properly determine this value
310 */
311static unsigned long __init prpmc750_find_end_of_memory(void)
312{
313 /* Read the memory size from the Hawk SMC */
314 return hawk_get_mem_size(PRPMC750_HAWK_SMC_BASE);
315}
316
317static void __init prpmc750_map_io(void)
318{
319 io_block_mapping(PRPMC750_ISA_IO_BASE, PRPMC750_ISA_IO_BASE,
320 0x10000000, _PAGE_IO);
321#if 0
322 io_block_mapping(0xf0000000, 0xc0000000, 0x08000000, _PAGE_IO);
323#endif
324 io_block_mapping(0xf8000000, 0xf8000000, 0x08000000, _PAGE_IO);
325}
326
327void __init
328platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
329 unsigned long r6, unsigned long r7)
330{
331 parse_bootinfo(find_bootinfo());
332
333 /* Cover the Hawk registers with a BAT */
334 prpmc750_set_bat();
335
336 isa_io_base = PRPMC750_ISA_IO_BASE;
337 isa_mem_base = PRPMC750_ISA_MEM_BASE;
338 pci_dram_offset = PRPMC750_PCI_DRAM_OFFSET;
339
340 ppc_md.setup_arch = prpmc750_setup_arch;
341 ppc_md.show_cpuinfo = prpmc750_show_cpuinfo;
342 ppc_md.init_IRQ = prpmc750_init_IRQ;
343 ppc_md.get_irq = openpic_get_irq;
344
345 ppc_md.find_end_of_memory = prpmc750_find_end_of_memory;
346 ppc_md.setup_io_mappings = prpmc750_map_io;
347
348 ppc_md.restart = prpmc750_restart;
349 ppc_md.power_off = prpmc750_power_off;
350 ppc_md.halt = prpmc750_halt;
351
352 /* PrPMC750 has no timekeeper part */
353 ppc_md.time_init = NULL;
354 ppc_md.get_rtc_time = NULL;
355 ppc_md.set_rtc_time = NULL;
356 ppc_md.calibrate_decr = prpmc750_calibrate_decr;
357
358#ifdef CONFIG_SERIAL_TEXT_DEBUG
359 ppc_md.progress = gen550_progress;
360#endif /* CONFIG_SERIAL_TEXT_DEBUG */
361}