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1da177e4 LT |
1 | /* |
2 | * arch/arm/mach-ixp2000/ixdp2x00.c | |
3 | * | |
4 | * Code common to IXDP2400 and IXDP2800 platforms. | |
5 | * | |
6 | * Original Author: Naeem Afzal <naeem.m.afzal@intel.com> | |
7 | * Maintainer: Deepak Saxena <dsaxena@plexity.net> | |
8 | * | |
9 | * Copyright (C) 2002 Intel Corp. | |
10 | * Copyright (C) 2003-2004 MontaVista Software, Inc. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by the | |
14 | * Free Software Foundation; either version 2 of the License, or (at your | |
15 | * option) any later version. | |
16 | */ | |
1da177e4 LT |
17 | #include <linux/kernel.h> |
18 | #include <linux/init.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/interrupt.h> | |
d052d1be | 22 | #include <linux/platform_device.h> |
1da177e4 LT |
23 | #include <linux/bitops.h> |
24 | #include <linux/pci.h> | |
25 | #include <linux/ioport.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/delay.h> | |
28 | ||
29 | #include <asm/io.h> | |
30 | #include <asm/irq.h> | |
31 | #include <asm/pgtable.h> | |
32 | #include <asm/page.h> | |
33 | #include <asm/system.h> | |
34 | #include <asm/hardware.h> | |
35 | #include <asm/mach-types.h> | |
36 | ||
37 | #include <asm/mach/pci.h> | |
38 | #include <asm/mach/map.h> | |
39 | #include <asm/mach/irq.h> | |
40 | #include <asm/mach/time.h> | |
41 | #include <asm/mach/flash.h> | |
42 | #include <asm/mach/arch.h> | |
43 | ||
8144f56b LB |
44 | #include <asm/arch/gpio.h> |
45 | ||
46 | ||
1da177e4 LT |
47 | /************************************************************************* |
48 | * IXDP2x00 IRQ Initialization | |
49 | *************************************************************************/ | |
50 | static volatile unsigned long *board_irq_mask; | |
51 | static volatile unsigned long *board_irq_stat; | |
52 | static unsigned long board_irq_count; | |
53 | ||
54 | #ifdef CONFIG_ARCH_IXDP2400 | |
55 | /* | |
56 | * Slowport configuration for accessing CPLD registers on IXDP2x00 | |
57 | */ | |
58 | static struct slowport_cfg slowport_cpld_cfg = { | |
59 | .CCR = SLOWPORT_CCR_DIV_2, | |
60 | .WTC = 0x00000070, | |
61 | .RTC = 0x00000070, | |
62 | .PCR = SLOWPORT_MODE_FLASH, | |
63 | .ADC = SLOWPORT_ADDR_WIDTH_24 | SLOWPORT_DATA_WIDTH_8 | |
64 | }; | |
65 | #endif | |
66 | ||
67 | static void ixdp2x00_irq_mask(unsigned int irq) | |
68 | { | |
69 | unsigned long dummy; | |
70 | static struct slowport_cfg old_cfg; | |
71 | ||
72 | /* | |
73 | * This is ugly in common code but really don't know | |
74 | * of a better way to handle it. :( | |
75 | */ | |
76 | #ifdef CONFIG_ARCH_IXDP2400 | |
77 | if (machine_is_ixdp2400()) | |
78 | ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg); | |
79 | #endif | |
80 | ||
81 | dummy = *board_irq_mask; | |
82 | dummy |= IXP2000_BOARD_IRQ_MASK(irq); | |
e9b72e43 | 83 | ixp2000_reg_wrb(board_irq_mask, dummy); |
1da177e4 LT |
84 | |
85 | #ifdef CONFIG_ARCH_IXDP2400 | |
86 | if (machine_is_ixdp2400()) | |
87 | ixp2000_release_slowport(&old_cfg); | |
88 | #endif | |
89 | } | |
90 | ||
91 | static void ixdp2x00_irq_unmask(unsigned int irq) | |
92 | { | |
93 | unsigned long dummy; | |
94 | static struct slowport_cfg old_cfg; | |
95 | ||
96 | #ifdef CONFIG_ARCH_IXDP2400 | |
97 | if (machine_is_ixdp2400()) | |
98 | ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg); | |
99 | #endif | |
100 | ||
101 | dummy = *board_irq_mask; | |
102 | dummy &= ~IXP2000_BOARD_IRQ_MASK(irq); | |
e9b72e43 | 103 | ixp2000_reg_wrb(board_irq_mask, dummy); |
1da177e4 LT |
104 | |
105 | if (machine_is_ixdp2400()) | |
106 | ixp2000_release_slowport(&old_cfg); | |
107 | } | |
108 | ||
109 | static void ixdp2x00_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs) | |
110 | { | |
111 | volatile u32 ex_interrupt = 0; | |
112 | static struct slowport_cfg old_cfg; | |
113 | int i; | |
114 | ||
115 | desc->chip->mask(irq); | |
116 | ||
117 | #ifdef CONFIG_ARCH_IXDP2400 | |
118 | if (machine_is_ixdp2400()) | |
119 | ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg); | |
120 | #endif | |
121 | ex_interrupt = *board_irq_stat & 0xff; | |
122 | if (machine_is_ixdp2400()) | |
123 | ixp2000_release_slowport(&old_cfg); | |
124 | ||
125 | if(!ex_interrupt) { | |
126 | printk(KERN_ERR "Spurious IXDP2x00 CPLD interrupt!\n"); | |
127 | return; | |
128 | } | |
129 | ||
130 | for(i = 0; i < board_irq_count; i++) { | |
131 | if(ex_interrupt & (1 << i)) { | |
132 | struct irqdesc *cpld_desc; | |
133 | int cpld_irq = IXP2000_BOARD_IRQ(0) + i; | |
134 | cpld_desc = irq_desc + cpld_irq; | |
664399e1 | 135 | desc_handle_irq(cpld_irq, cpld_desc, regs); |
1da177e4 LT |
136 | } |
137 | } | |
138 | ||
139 | desc->chip->unmask(irq); | |
140 | } | |
141 | ||
142 | static struct irqchip ixdp2x00_cpld_irq_chip = { | |
143 | .ack = ixdp2x00_irq_mask, | |
144 | .mask = ixdp2x00_irq_mask, | |
145 | .unmask = ixdp2x00_irq_unmask | |
146 | }; | |
147 | ||
148 | void ixdp2x00_init_irq(volatile unsigned long *stat_reg, volatile unsigned long *mask_reg, unsigned long nr_irqs) | |
149 | { | |
150 | unsigned int irq; | |
151 | ||
152 | ixp2000_init_irq(); | |
153 | ||
154 | if (!ixdp2x00_master_npu()) | |
155 | return; | |
156 | ||
157 | board_irq_stat = stat_reg; | |
158 | board_irq_mask = mask_reg; | |
159 | board_irq_count = nr_irqs; | |
160 | ||
161 | *board_irq_mask = 0xffffffff; | |
162 | ||
163 | for(irq = IXP2000_BOARD_IRQ(0); irq < IXP2000_BOARD_IRQ(board_irq_count); irq++) { | |
164 | set_irq_chip(irq, &ixdp2x00_cpld_irq_chip); | |
165 | set_irq_handler(irq, do_level_IRQ); | |
166 | set_irq_flags(irq, IRQF_VALID); | |
167 | } | |
168 | ||
169 | /* Hook into PCI interrupt */ | |
170 | set_irq_chained_handler(IRQ_IXP2000_PCIB, &ixdp2x00_irq_handler); | |
171 | } | |
172 | ||
173 | /************************************************************************* | |
174 | * IXDP2x00 memory map | |
175 | *************************************************************************/ | |
176 | static struct map_desc ixdp2x00_io_desc __initdata = { | |
177 | .virtual = IXDP2X00_VIRT_CPLD_BASE, | |
db0d087e | 178 | .pfn = __phys_to_pfn(IXDP2X00_PHYS_CPLD_BASE), |
1da177e4 LT |
179 | .length = IXDP2X00_CPLD_SIZE, |
180 | .type = MT_DEVICE | |
181 | }; | |
182 | ||
183 | void __init ixdp2x00_map_io(void) | |
184 | { | |
185 | ixp2000_map_io(); | |
186 | ||
187 | iotable_init(&ixdp2x00_io_desc, 1); | |
188 | } | |
189 | ||
190 | /************************************************************************* | |
191 | * IXDP2x00-common PCI init | |
192 | * | |
193 | * The IXDP2[48]00 has a horrid PCI bus layout. Basically the board | |
194 | * contains two NPUs (ingress and egress) connected over PCI, both running | |
195 | * instances of the kernel. So far so good. Peers on the PCI bus running | |
196 | * Linux is a common design in telecom systems. The problem is that instead | |
197 | * of all the devices being controlled by a single host, different | |
198 | * devices are controlles by different NPUs on the same bus, leading to | |
199 | * multiple hosts on the bus. The exact bus layout looks like: | |
200 | * | |
201 | * Bus 0 | |
202 | * Master NPU <-------------------+-------------------> Slave NPU | |
203 | * | | |
204 | * | | |
205 | * P2P | |
206 | * | | |
207 | * | |
208 | * Bus 1 | | |
209 | * <--+------+---------+---------+------+--> | |
210 | * | | | | | | |
211 | * | | | | | | |
212 | * ... Dev PMC Media Eth0 Eth1 ... | |
213 | * | |
214 | * The master controlls all but Eth1, which is controlled by the | |
215 | * slave. What this means is that the both the master and the slave | |
216 | * have to scan the bus, but only one of them can enumerate the bus. | |
217 | * In addition, after the bus is scanned, each kernel must remove | |
218 | * the device(s) it does not control from the PCI dev list otherwise | |
219 | * a driver on each NPU will try to manage it and we will have horrible | |
220 | * conflicts. Oh..and the slave NPU needs to see the master NPU | |
221 | * for Intel's drivers to work properly. Closed source drivers... | |
222 | * | |
223 | * The way we deal with this is fairly simple but ugly: | |
224 | * | |
225 | * 1) Let master scan and enumerate the bus completely. | |
226 | * 2) Master deletes Eth1 from device list. | |
227 | * 3) Slave scans bus and then deletes all but Eth1 (Eth0 on slave) | |
228 | * from device list. | |
229 | * 4) Find HW designers and LART them. | |
230 | * | |
231 | * The boards also do not do normal PCI IRQ routing, or any sort of | |
232 | * sensical swizzling, so we just need to check where on the bus a | |
233 | * device sits and figure out to which CPLD pin the interrupt is routed. | |
234 | * See ixdp2[48]00.c files. | |
235 | * | |
236 | *************************************************************************/ | |
237 | void ixdp2x00_slave_pci_postinit(void) | |
238 | { | |
239 | struct pci_dev *dev; | |
240 | ||
241 | /* | |
242 | * Remove PMC device is there is one | |
243 | */ | |
244 | if((dev = pci_find_slot(1, IXDP2X00_PMC_DEVFN))) | |
245 | pci_remove_bus_device(dev); | |
246 | ||
247 | dev = pci_find_slot(0, IXDP2X00_21555_DEVFN); | |
248 | pci_remove_bus_device(dev); | |
249 | } | |
250 | ||
251 | /************************************************************************** | |
252 | * IXDP2x00 Machine Setup | |
253 | *************************************************************************/ | |
254 | static struct flash_platform_data ixdp2x00_platform_data = { | |
255 | .map_name = "cfi_probe", | |
256 | .width = 1, | |
257 | }; | |
258 | ||
259 | static struct ixp2000_flash_data ixdp2x00_flash_data = { | |
260 | .platform_data = &ixdp2x00_platform_data, | |
261 | .nr_banks = 1 | |
262 | }; | |
263 | ||
264 | static struct resource ixdp2x00_flash_resource = { | |
265 | .start = 0xc4000000, | |
266 | .end = 0xc4000000 + 0x00ffffff, | |
267 | .flags = IORESOURCE_MEM, | |
268 | }; | |
269 | ||
270 | static struct platform_device ixdp2x00_flash = { | |
271 | .name = "IXP2000-Flash", | |
272 | .id = 0, | |
273 | .dev = { | |
274 | .platform_data = &ixdp2x00_flash_data, | |
275 | }, | |
276 | .num_resources = 1, | |
277 | .resource = &ixdp2x00_flash_resource, | |
278 | }; | |
279 | ||
280 | static struct ixp2000_i2c_pins ixdp2x00_i2c_gpio_pins = { | |
281 | .sda_pin = IXDP2X00_GPIO_SDA, | |
282 | .scl_pin = IXDP2X00_GPIO_SCL, | |
283 | }; | |
284 | ||
285 | static struct platform_device ixdp2x00_i2c_controller = { | |
286 | .name = "IXP2000-I2C", | |
287 | .id = 0, | |
288 | .dev = { | |
289 | .platform_data = &ixdp2x00_i2c_gpio_pins, | |
290 | }, | |
291 | .num_resources = 0 | |
292 | }; | |
293 | ||
294 | static struct platform_device *ixdp2x00_devices[] __initdata = { | |
295 | &ixdp2x00_flash, | |
296 | &ixdp2x00_i2c_controller | |
297 | }; | |
298 | ||
299 | void __init ixdp2x00_init_machine(void) | |
300 | { | |
301 | gpio_line_set(IXDP2X00_GPIO_I2C_ENABLE, 1); | |
302 | gpio_line_config(IXDP2X00_GPIO_I2C_ENABLE, GPIO_OUT); | |
303 | ||
304 | platform_add_devices(ixdp2x00_devices, ARRAY_SIZE(ixdp2x00_devices)); | |
28187f2c | 305 | ixp2000_uart_init(); |
1da177e4 LT |
306 | } |
307 |