[ARM] Remove EPXA10DB machine support
[linux-2.6/linux-loongson.git] / arch / ppc / platforms / powerpmc250.c
blobe6b520e6e13feaec3e9c073616f57821d1d9a97d
1 /*
2 * arch/ppc/platforms/powerpmc250.c
4 * Board setup routines for Force PowerPMC-250 Processor PMC
6 * Author: Troy Benjegerdes <tbenjegerdes@mvista.com>
7 * Borrowed heavily from prpmc750_*.c by
8 * Matt Porter <mporter@mvista.com>
10 * 2001 (c) MontaVista, Software, Inc. This file is licensed under
11 * the terms of the GNU General Public License version 2. This program
12 * is licensed "as is" without any warranty of any kind, whether express
13 * or implied.
16 #include <linux/config.h>
17 #include <linux/stddef.h>
18 #include <linux/kernel.h>
19 #include <linux/init.h>
20 #include <linux/errno.h>
21 #include <linux/reboot.h>
22 #include <linux/pci.h>
23 #include <linux/kdev_t.h>
24 #include <linux/types.h>
25 #include <linux/major.h>
26 #include <linux/initrd.h>
27 #include <linux/console.h>
28 #include <linux/delay.h>
29 #include <linux/slab.h>
30 #include <linux/seq_file.h>
31 #include <linux/ide.h>
32 #include <linux/root_dev.h>
34 #include <asm/byteorder.h>
35 #include <asm/system.h>
36 #include <asm/pgtable.h>
37 #include <asm/page.h>
38 #include <asm/dma.h>
39 #include <asm/io.h>
40 #include <asm/irq.h>
41 #include <asm/machdep.h>
42 #include <asm/time.h>
43 #include <platforms/powerpmc250.h>
44 #include <asm/open_pic.h>
45 #include <asm/pci-bridge.h>
46 #include <asm/mpc10x.h>
47 #include <asm/uaccess.h>
48 #include <asm/bootinfo.h>
50 extern void powerpmc250_find_bridges(void);
51 extern unsigned long loops_per_jiffy;
53 static u_char powerpmc250_openpic_initsenses[] __initdata =
55 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
56 1, /* PMC INTA (also MPC107 output interrupt INTA) */
57 1, /* PMC INTB (also I82559 Ethernet controller) */
58 1, /* PMC INTC */
59 1, /* PMC INTD */
60 0, /* DUART interrupt (active high) */
63 static int
64 powerpmc250_show_cpuinfo(struct seq_file *m)
66 seq_printf(m,"machine\t\t: Force PowerPMC250\n");
68 return 0;
71 static void __init
72 powerpmc250_setup_arch(void)
74 /* init to some ~sane value until calibrate_delay() runs */
75 loops_per_jiffy = 50000000/HZ;
77 /* Lookup PCI host bridges */
78 powerpmc250_find_bridges();
80 #ifdef CONFIG_BLK_DEV_INITRD
81 if (initrd_start)
82 ROOT_DEV = Root_RAM0;
83 else
84 #endif
85 #ifdef CONFIG_ROOT_NFS
86 ROOT_DEV = Root_NFS;
87 #else
88 ROOT_DEV = Root_SDA2;
89 #endif
91 printk("Force PowerPMC250 port (C) 2001 MontaVista Software, Inc. (source@mvista.com)\n");
94 #if 0
96 * Compute the PrPMC750's bus speed using the baud clock as a
97 * reference.
99 unsigned long __init powerpmc250_get_bus_speed(void)
101 unsigned long tbl_start, tbl_end;
102 unsigned long current_state, old_state, bus_speed;
103 unsigned char lcr, dll, dlm;
104 int baud_divisor, count;
106 /* Read the UART's baud clock divisor */
107 lcr = readb(PRPMC750_SERIAL_0_LCR);
108 writeb(lcr | UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
109 dll = readb(PRPMC750_SERIAL_0_DLL);
110 dlm = readb(PRPMC750_SERIAL_0_DLM);
111 writeb(lcr & ~UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
112 baud_divisor = (dlm << 8) | dll;
115 * Use the baud clock divisor and base baud clock
116 * to determine the baud rate and use that as
117 * the number of baud clock edges we use for
118 * the time base sample. Make it half the baud
119 * rate.
121 count = PRPMC750_BASE_BAUD / (baud_divisor * 16);
123 /* Find the first edge of the baud clock */
124 old_state = readb(PRPMC750_STATUS_REG) & PRPMC750_BAUDOUT_MASK;
125 do {
126 current_state = readb(PRPMC750_STATUS_REG) &
127 PRPMC750_BAUDOUT_MASK;
128 } while(old_state == current_state);
130 old_state = current_state;
132 /* Get the starting time base value */
133 tbl_start = get_tbl();
136 * Loop until we have found a number of edges equal
137 * to half the count (half the baud rate)
139 do {
140 do {
141 current_state = readb(PRPMC750_STATUS_REG) &
142 PRPMC750_BAUDOUT_MASK;
143 } while(old_state == current_state);
144 old_state = current_state;
145 } while (--count);
147 /* Get the ending time base value */
148 tbl_end = get_tbl();
150 /* Compute bus speed */
151 bus_speed = (tbl_end-tbl_start)*128;
153 return bus_speed;
155 #endif
157 static void __init
158 powerpmc250_calibrate_decr(void)
160 unsigned long freq;
161 int divisor = 4;
163 //freq = powerpmc250_get_bus_speed();
164 #warning hardcoded bus freq
165 freq = 100000000;
167 tb_ticks_per_jiffy = freq / (HZ * divisor);
168 tb_to_us = mulhwu_scale_factor(freq/divisor, 1000000);
171 static void
172 powerpmc250_restart(char *cmd)
174 local_irq_disable();
175 /* Hard reset */
176 writeb(0x11, 0xfe000332);
177 while(1);
180 static void
181 powerpmc250_halt(void)
183 local_irq_disable();
184 while (1);
187 static void
188 powerpmc250_power_off(void)
190 powerpmc250_halt();
193 static void __init
194 powerpmc250_init_IRQ(void)
197 OpenPIC_InitSenses = powerpmc250_openpic_initsenses;
198 OpenPIC_NumInitSenses = sizeof(powerpmc250_openpic_initsenses);
199 mpc10x_set_openpic();
203 * Set BAT 3 to map 0xf0000000 to end of physical memory space.
205 static __inline__ void
206 powerpmc250_set_bat(void)
208 unsigned long bat3u, bat3l;
209 static int mapping_set = 0;
211 if (!mapping_set)
213 __asm__ __volatile__(
214 " lis %0,0xf000\n \
215 ori %1,%0,0x002a\n \
216 ori %0,%0,0x1ffe\n \
217 mtspr 0x21e,%0\n \
218 mtspr 0x21f,%1\n \
219 isync\n \
220 sync "
221 : "=r" (bat3u), "=r" (bat3l));
223 mapping_set = 1;
225 return;
228 static unsigned long __init
229 powerpmc250_find_end_of_memory(void)
231 /* Cover I/O space with a BAT */
232 /* yuck, better hope your ram size is a power of 2 -- paulus */
233 powerpmc250_set_bat();
235 return mpc10x_get_mem_size(MPC10X_MEM_MAP_B);
238 static void __init
239 powerpmc250_map_io(void)
241 io_block_mapping(0xfe000000, 0xfe000000, 0x02000000, _PAGE_IO);
244 void __init
245 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
246 unsigned long r6, unsigned long r7)
248 parse_bootinfo(find_bootinfo());
250 #ifdef CONFIG_BLK_DEV_INITRD
251 if ( r4 )
253 initrd_start = r4 + KERNELBASE;
254 initrd_end = r5 + KERNELBASE;
256 #endif
258 /* Copy cmd_line parameters */
259 if ( r6)
261 *(char *)(r7 + KERNELBASE) = 0;
262 strcpy(cmd_line, (char *)(r6 + KERNELBASE));
265 isa_io_base = MPC10X_MAPB_ISA_IO_BASE;
266 isa_mem_base = MPC10X_MAPB_ISA_MEM_BASE;
267 pci_dram_offset = MPC10X_MAPB_DRAM_OFFSET;
269 ppc_md.setup_arch = powerpmc250_setup_arch;
270 ppc_md.show_cpuinfo = powerpmc250_show_cpuinfo;
271 ppc_md.init_IRQ = powerpmc250_init_IRQ;
272 ppc_md.get_irq = openpic_get_irq;
274 ppc_md.find_end_of_memory = powerpmc250_find_end_of_memory;
275 ppc_md.setup_io_mappings = powerpmc250_map_io;
277 ppc_md.restart = powerpmc250_restart;
278 ppc_md.power_off = powerpmc250_power_off;
279 ppc_md.halt = powerpmc250_halt;
281 /* PowerPMC250 has no timekeeper part */
282 ppc_md.time_init = NULL;
283 ppc_md.get_rtc_time = NULL;
284 ppc_md.set_rtc_time = NULL;
285 ppc_md.calibrate_decr = powerpmc250_calibrate_decr;
290 * (This used to be arch/ppc/platforms/powerpmc250_pci.c)
292 * PCI support for Force PowerPMC250
296 #undef DEBUG
297 #ifdef DEBUG
298 #define DBG(x...) printk(x)
299 #else
300 #define DBG(x...)
301 #endif /* DEBUG */
303 static inline int __init
304 powerpmc250_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
306 static char pci_irq_table[][4] =
308 * PCI IDSEL/INTPIN->INTLINE
309 * A B C D
312 {17, 0, 0, 0}, /* Device 11 - 82559 */
313 {0, 0, 0, 0}, /* 12 */
314 {0, 0, 0, 0}, /* 13 */
315 {0, 0, 0, 0}, /* 14 */
316 {0, 0, 0, 0}, /* 15 */
317 {16, 17, 18, 19}, /* Device 16 - PMC A1?? */
319 const long min_idsel = 11, max_idsel = 16, irqs_per_slot = 4;
320 return PCI_IRQ_TABLE_LOOKUP;
323 static int
324 powerpmc250_exclude_device(u_char bus, u_char devfn)
327 * While doing PCI Scan the MPC107 will 'detect' itself as
328 * device on the PCI Bus, will create an incorrect response and
329 * later will respond incorrectly to Configuration read coming
330 * from another device.
332 * The work around is that when doing a PCI Scan one
333 * should skip its own device number in the scan.
335 * The top IDsel is AD13 and the middle is AD14.
337 * -- Note from force
340 if ((bus == 0) && (PCI_SLOT(devfn) == 13 || PCI_SLOT(devfn) == 14)) {
341 return PCIBIOS_DEVICE_NOT_FOUND;
343 else {
344 return PCIBIOS_SUCCESSFUL;
348 void __init
349 powerpmc250_find_bridges(void)
351 struct pci_controller* hose;
353 hose = pcibios_alloc_controller();
354 if (!hose){
355 printk("Can't allocate PCI 'hose' structure!!!\n");
356 return;
359 hose->first_busno = 0;
360 hose->last_busno = 0xff;
362 if (mpc10x_bridge_init(hose,
363 MPC10X_MEM_MAP_B,
364 MPC10X_MEM_MAP_B,
365 MPC10X_MAPB_EUMB_BASE) == 0) {
367 hose->mem_resources[0].end = 0xffffffff;
369 hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
371 /* ppc_md.pcibios_fixup = pcore_pcibios_fixup; */
372 ppc_md.pci_swizzle = common_swizzle;
374 ppc_md.pci_exclude_device = powerpmc250_exclude_device;
375 ppc_md.pci_map_irq = powerpmc250_map_irq;
376 } else {
377 if (ppc_md.progress)
378 ppc_md.progress("Bridge init failed", 0x100);
379 printk("Host bridge init failed\n");