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bfee95bb GL |
1 | /* |
2 | * Support for 'media5200-platform' compatible boards. | |
3 | * | |
4 | * Copyright (C) 2008 Secret Lab Technologies Ltd. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2 of the License, or (at your | |
9 | * option) any later version. | |
10 | * | |
11 | * Description: | |
12 | * This code implements support for the Freescape Media5200 platform | |
13 | * (built around the MPC5200 SoC). | |
14 | * | |
15 | * Notable characteristic of the Media5200 is the presence of an FPGA | |
16 | * that has all external IRQ lines routed through it. This file implements | |
17 | * a cascaded interrupt controller driver which attaches itself to the | |
18 | * Virtual IRQ subsystem after the primary mpc5200 interrupt controller | |
19 | * is initialized. | |
20 | * | |
21 | */ | |
22 | ||
23 | #undef DEBUG | |
24 | ||
25 | #include <linux/irq.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/io.h> | |
28 | #include <asm/time.h> | |
29 | #include <asm/prom.h> | |
30 | #include <asm/machdep.h> | |
31 | #include <asm/mpc52xx.h> | |
32 | ||
33 | static struct of_device_id mpc5200_gpio_ids[] __initdata = { | |
34 | { .compatible = "fsl,mpc5200-gpio", }, | |
35 | { .compatible = "mpc5200-gpio", }, | |
36 | {} | |
37 | }; | |
38 | ||
39 | /* FPGA register set */ | |
40 | #define MEDIA5200_IRQ_ENABLE (0x40c) | |
41 | #define MEDIA5200_IRQ_STATUS (0x410) | |
42 | #define MEDIA5200_NUM_IRQS (6) | |
43 | #define MEDIA5200_IRQ_SHIFT (32 - MEDIA5200_NUM_IRQS) | |
44 | ||
45 | struct media5200_irq { | |
46 | void __iomem *regs; | |
47 | spinlock_t lock; | |
48 | struct irq_host *irqhost; | |
49 | }; | |
50 | struct media5200_irq media5200_irq; | |
51 | ||
52 | static void media5200_irq_unmask(unsigned int virq) | |
53 | { | |
54 | unsigned long flags; | |
55 | u32 val; | |
56 | ||
57 | spin_lock_irqsave(&media5200_irq.lock, flags); | |
58 | val = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE); | |
59 | val |= 1 << (MEDIA5200_IRQ_SHIFT + irq_map[virq].hwirq); | |
60 | out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, val); | |
61 | spin_unlock_irqrestore(&media5200_irq.lock, flags); | |
62 | } | |
63 | ||
64 | static void media5200_irq_mask(unsigned int virq) | |
65 | { | |
66 | unsigned long flags; | |
67 | u32 val; | |
68 | ||
69 | spin_lock_irqsave(&media5200_irq.lock, flags); | |
70 | val = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE); | |
71 | val &= ~(1 << (MEDIA5200_IRQ_SHIFT + irq_map[virq].hwirq)); | |
72 | out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, val); | |
73 | spin_unlock_irqrestore(&media5200_irq.lock, flags); | |
74 | } | |
75 | ||
76 | static struct irq_chip media5200_irq_chip = { | |
b27df672 | 77 | .name = "Media5200 FPGA", |
bfee95bb GL |
78 | .unmask = media5200_irq_unmask, |
79 | .mask = media5200_irq_mask, | |
80 | .mask_ack = media5200_irq_mask, | |
81 | }; | |
82 | ||
83 | void media5200_irq_cascade(unsigned int virq, struct irq_desc *desc) | |
84 | { | |
85 | int sub_virq, val; | |
86 | u32 status, enable; | |
87 | ||
88 | /* Mask off the cascaded IRQ */ | |
89 | spin_lock(&desc->lock); | |
90 | desc->chip->mask(virq); | |
91 | spin_unlock(&desc->lock); | |
92 | ||
93 | /* Ask the FPGA for IRQ status. If 'val' is 0, then no irqs | |
94 | * are pending. 'ffs()' is 1 based */ | |
95 | status = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE); | |
96 | enable = in_be32(media5200_irq.regs + MEDIA5200_IRQ_STATUS); | |
97 | val = ffs((status & enable) >> MEDIA5200_IRQ_SHIFT); | |
98 | if (val) { | |
99 | sub_virq = irq_linear_revmap(media5200_irq.irqhost, val - 1); | |
100 | /* pr_debug("%s: virq=%i s=%.8x e=%.8x hwirq=%i subvirq=%i\n", | |
101 | * __func__, virq, status, enable, val - 1, sub_virq); | |
102 | */ | |
103 | generic_handle_irq(sub_virq); | |
104 | } | |
105 | ||
106 | /* Processing done; can reenable the cascade now */ | |
107 | spin_lock(&desc->lock); | |
108 | desc->chip->ack(virq); | |
109 | if (!(desc->status & IRQ_DISABLED)) | |
110 | desc->chip->unmask(virq); | |
111 | spin_unlock(&desc->lock); | |
112 | } | |
113 | ||
114 | static int media5200_irq_map(struct irq_host *h, unsigned int virq, | |
115 | irq_hw_number_t hw) | |
116 | { | |
6cff46f4 | 117 | struct irq_desc *desc = irq_to_desc(virq); |
bfee95bb GL |
118 | |
119 | pr_debug("%s: h=%p, virq=%i, hwirq=%i\n", __func__, h, virq, (int)hw); | |
120 | set_irq_chip_data(virq, &media5200_irq); | |
121 | set_irq_chip_and_handler(virq, &media5200_irq_chip, handle_level_irq); | |
122 | set_irq_type(virq, IRQ_TYPE_LEVEL_LOW); | |
123 | desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL); | |
124 | desc->status |= IRQ_TYPE_LEVEL_LOW | IRQ_LEVEL; | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | static int media5200_irq_xlate(struct irq_host *h, struct device_node *ct, | |
130 | u32 *intspec, unsigned int intsize, | |
131 | irq_hw_number_t *out_hwirq, | |
132 | unsigned int *out_flags) | |
133 | { | |
134 | if (intsize != 2) | |
135 | return -1; | |
136 | ||
137 | pr_debug("%s: bank=%i, number=%i\n", __func__, intspec[0], intspec[1]); | |
138 | *out_hwirq = intspec[1]; | |
139 | *out_flags = IRQ_TYPE_NONE; | |
140 | return 0; | |
141 | } | |
142 | ||
143 | static struct irq_host_ops media5200_irq_ops = { | |
144 | .map = media5200_irq_map, | |
145 | .xlate = media5200_irq_xlate, | |
146 | }; | |
147 | ||
148 | /* | |
149 | * Setup Media5200 IRQ mapping | |
150 | */ | |
151 | static void __init media5200_init_irq(void) | |
152 | { | |
153 | struct device_node *fpga_np; | |
154 | int cascade_virq; | |
155 | ||
156 | /* First setup the regular MPC5200 interrupt controller */ | |
157 | mpc52xx_init_irq(); | |
158 | ||
159 | /* Now find the FPGA IRQ */ | |
160 | fpga_np = of_find_compatible_node(NULL, NULL, "fsl,media5200-fpga"); | |
161 | if (!fpga_np) | |
162 | goto out; | |
163 | pr_debug("%s: found fpga node: %s\n", __func__, fpga_np->full_name); | |
164 | ||
165 | media5200_irq.regs = of_iomap(fpga_np, 0); | |
166 | if (!media5200_irq.regs) | |
167 | goto out; | |
168 | pr_debug("%s: mapped to %p\n", __func__, media5200_irq.regs); | |
169 | ||
170 | cascade_virq = irq_of_parse_and_map(fpga_np, 0); | |
171 | if (!cascade_virq) | |
172 | goto out; | |
173 | pr_debug("%s: cascaded on virq=%i\n", __func__, cascade_virq); | |
174 | ||
175 | /* Disable all FPGA IRQs */ | |
176 | out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, 0); | |
177 | ||
178 | spin_lock_init(&media5200_irq.lock); | |
179 | ||
180 | media5200_irq.irqhost = irq_alloc_host(fpga_np, IRQ_HOST_MAP_LINEAR, | |
181 | MEDIA5200_NUM_IRQS, | |
182 | &media5200_irq_ops, -1); | |
183 | if (!media5200_irq.irqhost) | |
184 | goto out; | |
185 | pr_debug("%s: allocated irqhost\n", __func__); | |
186 | ||
187 | media5200_irq.irqhost->host_data = &media5200_irq; | |
188 | ||
189 | set_irq_data(cascade_virq, &media5200_irq); | |
190 | set_irq_chained_handler(cascade_virq, media5200_irq_cascade); | |
191 | ||
192 | return; | |
193 | ||
194 | out: | |
195 | pr_err("Could not find Media5200 FPGA; PCI interrupts will not work\n"); | |
196 | } | |
197 | ||
198 | /* | |
199 | * Setup the architecture | |
200 | */ | |
201 | static void __init media5200_setup_arch(void) | |
202 | { | |
203 | ||
204 | struct device_node *np; | |
205 | struct mpc52xx_gpio __iomem *gpio; | |
206 | u32 port_config; | |
207 | ||
208 | if (ppc_md.progress) | |
209 | ppc_md.progress("media5200_setup_arch()", 0); | |
210 | ||
211 | /* Map important registers from the internal memory map */ | |
212 | mpc52xx_map_common_devices(); | |
213 | ||
214 | /* Some mpc5200 & mpc5200b related configuration */ | |
215 | mpc5200_setup_xlb_arbiter(); | |
216 | ||
217 | mpc52xx_setup_pci(); | |
218 | ||
219 | np = of_find_matching_node(NULL, mpc5200_gpio_ids); | |
220 | gpio = of_iomap(np, 0); | |
221 | of_node_put(np); | |
222 | if (!gpio) { | |
223 | printk(KERN_ERR "%s() failed. expect abnormal behavior\n", | |
224 | __func__); | |
225 | return; | |
226 | } | |
227 | ||
228 | /* Set port config */ | |
229 | port_config = in_be32(&gpio->port_config); | |
230 | ||
231 | port_config &= ~0x03000000; /* ATA CS is on csb_4/5 */ | |
232 | port_config |= 0x01000000; | |
233 | ||
234 | out_be32(&gpio->port_config, port_config); | |
235 | ||
236 | /* Unmap zone */ | |
237 | iounmap(gpio); | |
238 | ||
239 | } | |
240 | ||
241 | /* list of the supported boards */ | |
242 | static char *board[] __initdata = { | |
243 | "fsl,media5200", | |
244 | NULL | |
245 | }; | |
246 | ||
247 | /* | |
248 | * Called very early, MMU is off, device-tree isn't unflattened | |
249 | */ | |
250 | static int __init media5200_probe(void) | |
251 | { | |
252 | unsigned long node = of_get_flat_dt_root(); | |
253 | int i = 0; | |
254 | ||
255 | while (board[i]) { | |
256 | if (of_flat_dt_is_compatible(node, board[i])) | |
257 | break; | |
258 | i++; | |
259 | } | |
260 | ||
261 | return (board[i] != NULL); | |
262 | } | |
263 | ||
264 | define_machine(media5200_platform) { | |
265 | .name = "media5200-platform", | |
266 | .probe = media5200_probe, | |
267 | .setup_arch = media5200_setup_arch, | |
268 | .init = mpc52xx_declare_of_platform_devices, | |
269 | .init_IRQ = media5200_init_irq, | |
270 | .get_irq = mpc52xx_get_irq, | |
271 | .restart = mpc52xx_restart, | |
272 | .calibrate_decr = generic_calibrate_decr, | |
273 | }; |