diff options
author | Grant Likely <grant.likely@secretlab.ca> | 2009-02-04 13:39:17 -0700 |
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committer | Grant Likely <grant.likely@secretlab.ca> | 2009-02-04 13:39:17 -0700 |
commit | bfee95bb830ff0260f3e2e0b1aa6b7492573fe4d (patch) | |
tree | 385c88b41941e5e5021589d50142a613e4f0ebe6 /arch/powerpc/platforms/52xx/media5200.c | |
parent | 5496eab2434f2a2dfe0d35496fd9605d548b7fbc (diff) |
powerpc/5200: Add support for the Media5200 board from Freescale
This patch adds board support for the Media5200 platform. Changes are:
- add the media5200 device tree
- add the media5200 platform support code and cascaded interrupt controller
- add media5200 to the build targets.
Note: this patch also includes a minor tweak to the lite5200(b) target
images list to add the .dtb files to the image list.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'arch/powerpc/platforms/52xx/media5200.c')
-rw-r--r-- | arch/powerpc/platforms/52xx/media5200.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/52xx/media5200.c b/arch/powerpc/platforms/52xx/media5200.c new file mode 100644 index 000000000000..68e4f1696d14 --- /dev/null +++ b/arch/powerpc/platforms/52xx/media5200.c @@ -0,0 +1,273 @@ +/* + * 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_host *irqhost; +}; +struct media5200_irq media5200_irq; + +static void media5200_irq_unmask(unsigned int virq) +{ + 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 + irq_map[virq].hwirq); + out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, val); + spin_unlock_irqrestore(&media5200_irq.lock, flags); +} + +static void media5200_irq_mask(unsigned int virq) +{ + 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 + irq_map[virq].hwirq)); + out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, val); + spin_unlock_irqrestore(&media5200_irq.lock, flags); +} + +static struct irq_chip media5200_irq_chip = { + .typename = "Media5200 FPGA", + .unmask = media5200_irq_unmask, + .mask = media5200_irq_mask, + .mask_ack = media5200_irq_mask, +}; + +void media5200_irq_cascade(unsigned int virq, struct irq_desc *desc) +{ + int sub_virq, val; + u32 status, enable; + + /* Mask off the cascaded IRQ */ + spin_lock(&desc->lock); + desc->chip->mask(virq); + 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 */ + spin_lock(&desc->lock); + desc->chip->ack(virq); + if (!(desc->status & IRQ_DISABLED)) + desc->chip->unmask(virq); + spin_unlock(&desc->lock); +} + +static int media5200_irq_map(struct irq_host *h, unsigned int virq, + irq_hw_number_t hw) +{ + struct irq_desc *desc = get_irq_desc(virq); + + pr_debug("%s: h=%p, virq=%i, hwirq=%i\n", __func__, h, virq, (int)hw); + set_irq_chip_data(virq, &media5200_irq); + set_irq_chip_and_handler(virq, &media5200_irq_chip, handle_level_irq); + set_irq_type(virq, IRQ_TYPE_LEVEL_LOW); + desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL); + desc->status |= IRQ_TYPE_LEVEL_LOW | IRQ_LEVEL; + + return 0; +} + +static int media5200_irq_xlate(struct irq_host *h, struct device_node *ct, + 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 struct irq_host_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_alloc_host(fpga_np, IRQ_HOST_MAP_LINEAR, + MEDIA5200_NUM_IRQS, + &media5200_irq_ops, -1); + if (!media5200_irq.irqhost) + goto out; + pr_debug("%s: allocated irqhost\n", __func__); + + media5200_irq.irqhost->host_data = &media5200_irq; + + set_irq_data(cascade_virq, &media5200_irq); + set_irq_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 char *board[] __initdata = { + "fsl,media5200", + NULL +}; + +/* + * Called very early, MMU is off, device-tree isn't unflattened + */ +static int __init media5200_probe(void) +{ + unsigned long node = of_get_flat_dt_root(); + int i = 0; + + while (board[i]) { + if (of_flat_dt_is_compatible(node, board[i])) + break; + i++; + } + + return (board[i] != NULL); +} + +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, +}; |