/* * Support for 'media5200-platform' compatible boards. * * Copyright (C) 2008 Secret Lab Technologies Ltd. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * Description: * This code implements support for the Freescape Media5200 platform * (built around the MPC5200 SoC). * * Notable characteristic of the Media5200 is the presence of an FPGA * that has all external IRQ lines routed through it. This file implements * a cascaded interrupt controller driver which attaches itself to the * Virtual IRQ subsystem after the primary mpc5200 interrupt controller * is initialized. * */ #undef DEBUG #include <linux/irq.h> #include <linux/interrupt.h> #include <linux/io.h> #include <asm/time.h> #include <asm/prom.h> #include <asm/machdep.h> #include <asm/mpc52xx.h> static struct of_device_id mpc5200_gpio_ids[] __initdata = { { .compatible = "fsl,mpc5200-gpio", }, { .compatible = "mpc5200-gpio", }, {} }; /* FPGA register set */ #define MEDIA5200_IRQ_ENABLE (0x40c) #define MEDIA5200_IRQ_STATUS (0x410) #define MEDIA5200_NUM_IRQS (6) #define MEDIA5200_IRQ_SHIFT (32 - MEDIA5200_NUM_IRQS) struct media5200_irq { void __iomem *regs; spinlock_t lock; struct irq_domain *irqhost; }; struct media5200_irq media5200_irq; static void media5200_irq_unmask(struct irq_data *d) { unsigned long flags; u32 val; spin_lock_irqsave(&media5200_irq.lock, flags); val = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE); val |= 1 << (MEDIA5200_IRQ_SHIFT + irqd_to_hwirq(d)); out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, val); spin_unlock_irqrestore(&media5200_irq.lock, flags); } static void media5200_irq_mask(struct irq_data *d) { unsigned long flags; u32 val; spin_lock_irqsave(&media5200_irq.lock, flags); val = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE); val &= ~(1 << (MEDIA5200_IRQ_SHIFT + irqd_to_hwirq(d))); out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, val); spin_unlock_irqrestore(&media5200_irq.lock, flags); } static struct irq_chip media5200_irq_chip = { .name = "Media5200 FPGA", .irq_unmask = media5200_irq_unmask, .irq_mask = media5200_irq_mask, .irq_mask_ack = media5200_irq_mask, }; void media5200_irq_cascade(unsigned int virq, struct irq_desc *desc) { struct irq_chip *chip = irq_desc_get_chip(desc); int sub_virq, val; u32 status, enable; /* Mask off the cascaded IRQ */ raw_spin_lock(&desc->lock); chip->irq_mask(&desc->irq_data); raw_spin_unlock(&desc->lock); /* Ask the FPGA for IRQ status. If 'val' is 0, then no irqs * are pending. 'ffs()' is 1 based */ status = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE); enable = in_be32(media5200_irq.regs + MEDIA5200_IRQ_STATUS); val = ffs((status & enable) >> MEDIA5200_IRQ_SHIFT); if (val) { sub_virq = irq_linear_revmap(media5200_irq.irqhost, val - 1); /* pr_debug("%s: virq=%i s=%.8x e=%.8x hwirq=%i subvirq=%i\n", * __func__, virq, status, enable, val - 1, sub_virq); */ generic_handle_irq(sub_virq); } /* Processing done; can reenable the cascade now */ raw_spin_lock(&desc->lock); chip->irq_ack(&desc->irq_data); if (!irqd_irq_disabled(&desc->irq_data)) chip->irq_unmask(&desc->irq_data); raw_spin_unlock(&desc->lock); } static int media5200_irq_map(struct irq_domain *h, unsigned int virq, irq_hw_number_t hw) { pr_debug("%s: h=%p, virq=%i, hwirq=%i\n", __func__, h, virq, (int)hw); irq_set_chip_data(virq, &media5200_irq); irq_set_chip_and_handler(virq, &media5200_irq_chip, handle_level_irq); irq_set_status_flags(virq, IRQ_LEVEL); return 0; } static int media5200_irq_xlate(struct irq_domain *h, struct device_node *ct, const u32 *intspec, unsigned int intsize, irq_hw_number_t *out_hwirq, unsigned int *out_flags) { if (intsize != 2) return -1; pr_debug("%s: bank=%i, number=%i\n", __func__, intspec[0], intspec[1]); *out_hwirq = intspec[1]; *out_flags = IRQ_TYPE_NONE; return 0; } static const struct irq_domain_ops media5200_irq_ops = { .map = media5200_irq_map, .xlate = media5200_irq_xlate, }; /* * Setup Media5200 IRQ mapping */ static void __init media5200_init_irq(void) { struct device_node *fpga_np; int cascade_virq; /* First setup the regular MPC5200 interrupt controller */ mpc52xx_init_irq(); /* Now find the FPGA IRQ */ fpga_np = of_find_compatible_node(NULL, NULL, "fsl,media5200-fpga"); if (!fpga_np) goto out; pr_debug("%s: found fpga node: %s\n", __func__, fpga_np->full_name); media5200_irq.regs = of_iomap(fpga_np, 0); if (!media5200_irq.regs) goto out; pr_debug("%s: mapped to %p\n", __func__, media5200_irq.regs); cascade_virq = irq_of_parse_and_map(fpga_np, 0); if (!cascade_virq) goto out; pr_debug("%s: cascaded on virq=%i\n", __func__, cascade_virq); /* Disable all FPGA IRQs */ out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, 0); spin_lock_init(&media5200_irq.lock); media5200_irq.irqhost = irq_domain_add_linear(fpga_np, MEDIA5200_NUM_IRQS, &media5200_irq_ops, &media5200_irq); if (!media5200_irq.irqhost) goto out; pr_debug("%s: allocated irqhost\n", __func__); irq_set_handler_data(cascade_virq, &media5200_irq); irq_set_chained_handler(cascade_virq, media5200_irq_cascade); return; out: pr_err("Could not find Media5200 FPGA; PCI interrupts will not work\n"); } /* * Setup the architecture */ static void __init media5200_setup_arch(void) { struct device_node *np; struct mpc52xx_gpio __iomem *gpio; u32 port_config; if (ppc_md.progress) ppc_md.progress("media5200_setup_arch()", 0); /* Map important registers from the internal memory map */ mpc52xx_map_common_devices(); /* Some mpc5200 & mpc5200b related configuration */ mpc5200_setup_xlb_arbiter(); mpc52xx_setup_pci(); np = of_find_matching_node(NULL, mpc5200_gpio_ids); gpio = of_iomap(np, 0); of_node_put(np); if (!gpio) { printk(KERN_ERR "%s() failed. expect abnormal behavior\n", __func__); return; } /* Set port config */ port_config = in_be32(&gpio->port_config); port_config &= ~0x03000000; /* ATA CS is on csb_4/5 */ port_config |= 0x01000000; out_be32(&gpio->port_config, port_config); /* Unmap zone */ iounmap(gpio); } /* list of the supported boards */ static const char * const board[] __initconst = { "fsl,media5200", NULL }; /* * Called very early, MMU is off, device-tree isn't unflattened */ static int __init media5200_probe(void) { return of_flat_dt_match(of_get_flat_dt_root(), board); } define_machine(media5200_platform) { .name = "media5200-platform", .probe = media5200_probe, .setup_arch = media5200_setup_arch, .init = mpc52xx_declare_of_platform_devices, .init_IRQ = media5200_init_irq, .get_irq = mpc52xx_get_irq, .restart = mpc52xx_restart, .calibrate_decr = generic_calibrate_decr, };