2 * Support for 'media5200-platform' compatible boards.
4 * Copyright (C) 2008 Secret Lab Technologies Ltd.
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.
12 * This code implements support for the Freescape Media5200 platform
13 * (built around the MPC5200 SoC).
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
25 #include <linux/irq.h>
26 #include <linux/interrupt.h>
30 #include <asm/machdep.h>
31 #include <asm/mpc52xx.h>
33 static struct of_device_id mpc5200_gpio_ids[] __initdata = {
34 { .compatible = "fsl,mpc5200-gpio", },
35 { .compatible = "mpc5200-gpio", },
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)
45 struct media5200_irq {
48 struct irq_host *irqhost;
50 struct media5200_irq media5200_irq;
52 static void media5200_irq_unmask(unsigned int virq)
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);
64 static void media5200_irq_mask(unsigned int virq)
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);
76 static struct irq_chip media5200_irq_chip = {
77 .typename = "Media5200 FPGA",
78 .unmask = media5200_irq_unmask,
79 .mask = media5200_irq_mask,
80 .mask_ack = media5200_irq_mask,
83 void media5200_irq_cascade(unsigned int virq, struct irq_desc *desc)
88 /* Mask off the cascaded IRQ */
89 spin_lock(&desc->lock);
90 desc->chip->mask(virq);
91 spin_unlock(&desc->lock);
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);
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);
103 generic_handle_irq(sub_virq);
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);
114 static int media5200_irq_map(struct irq_host *h, unsigned int virq,
117 struct irq_desc *desc = get_irq_desc(virq);
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;
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)
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;
143 static struct irq_host_ops media5200_irq_ops = {
144 .map = media5200_irq_map,
145 .xlate = media5200_irq_xlate,
149 * Setup Media5200 IRQ mapping
151 static void __init media5200_init_irq(void)
153 struct device_node *fpga_np;
156 /* First setup the regular MPC5200 interrupt controller */
159 /* Now find the FPGA IRQ */
160 fpga_np = of_find_compatible_node(NULL, NULL, "fsl,media5200-fpga");
163 pr_debug("%s: found fpga node: %s\n", __func__, fpga_np->full_name);
165 media5200_irq.regs = of_iomap(fpga_np, 0);
166 if (!media5200_irq.regs)
168 pr_debug("%s: mapped to %p\n", __func__, media5200_irq.regs);
170 cascade_virq = irq_of_parse_and_map(fpga_np, 0);
173 pr_debug("%s: cascaded on virq=%i\n", __func__, cascade_virq);
175 /* Disable all FPGA IRQs */
176 out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, 0);
178 spin_lock_init(&media5200_irq.lock);
180 media5200_irq.irqhost = irq_alloc_host(fpga_np, IRQ_HOST_MAP_LINEAR,
182 &media5200_irq_ops, -1);
183 if (!media5200_irq.irqhost)
185 pr_debug("%s: allocated irqhost\n", __func__);
187 media5200_irq.irqhost->host_data = &media5200_irq;
189 set_irq_data(cascade_virq, &media5200_irq);
190 set_irq_chained_handler(cascade_virq, media5200_irq_cascade);
195 pr_err("Could not find Media5200 FPGA; PCI interrupts will not work\n");
199 * Setup the architecture
201 static void __init media5200_setup_arch(void)
204 struct device_node *np;
205 struct mpc52xx_gpio __iomem *gpio;
209 ppc_md.progress("media5200_setup_arch()", 0);
211 /* Map important registers from the internal memory map */
212 mpc52xx_map_common_devices();
214 /* Some mpc5200 & mpc5200b related configuration */
215 mpc5200_setup_xlb_arbiter();
219 np = of_find_matching_node(NULL, mpc5200_gpio_ids);
220 gpio = of_iomap(np, 0);
223 printk(KERN_ERR "%s() failed. expect abnormal behavior\n",
228 /* Set port config */
229 port_config = in_be32(&gpio->port_config);
231 port_config &= ~0x03000000; /* ATA CS is on csb_4/5 */
232 port_config |= 0x01000000;
234 out_be32(&gpio->port_config, port_config);
241 /* list of the supported boards */
242 static char *board[] __initdata = {
248 * Called very early, MMU is off, device-tree isn't unflattened
250 static int __init media5200_probe(void)
252 unsigned long node = of_get_flat_dt_root();
256 if (of_flat_dt_is_compatible(node, board[i]))
261 return (board[i] != NULL);
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,