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path: root/drivers/iio/dac/ad5449.c

Age	Commit message (Expand)	Author
2017-08-22	iio:dac: drop assignment of iio_info.driver_module	Jonathan Cameron
2015-10-28	spi: Drop owner assignment from spi_drivers	Andrew F. Davis
2013-12-17	iio:dac:ad5449 replaces IIO_ST macro with explicit entries to struct scan_type	Jonathan Cameron
2013-10-05	iio:ad5449: Use spi_sync_transfer()	Lars-Peter Clausen
2013-08-19	iio: dac: ad5449: Use devm_* APIs	Sachin Kamat
2013-03-17	iio:dac:ad5449 move to info_mask_(shared_by_type/separate)	Jonathan Cameron
2013-01-03	Drivers: iio: remove __dev* attributes.	Greg Kroah-Hartman
2012-10-31	iio:dac:ad5449: unlock on error path	Dan Carpenter
2012-10-19	iio:dac: Add support for the ad5449	Lars-Peter Clausen

generated by cgit v1.2.3 (git 2.25.1) at 2024-08-25 21:25:23 +0000

/*
 * PowerNV OPAL high level interfaces
 *
 * Copyright 2011 IBM Corp.
 *
 * 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.
 */

#undef DEBUG

#include <linux/types.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_platform.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/kobject.h>
#include <linux/delay.h>
#include <linux/memblock.h>

#include <asm/machdep.h>
#include <asm/opal.h>
#include <asm/firmware.h>
#include <asm/mce.h>

#include "powernv.h"

/* /sys/firmware/opal */
struct kobject *opal_kobj;

struct opal {
	u64 base;
	u64 entry;
	u64 size;
} opal;

struct mcheck_recoverable_range {
	u64 start_addr;
	u64 end_addr;
	u64 recover_addr;
};

static struct mcheck_recoverable_range *mc_recoverable_range;
static int mc_recoverable_range_len;

struct device_node *opal_node;
static DEFINE_SPINLOCK(opal_write_lock);
extern u64 opal_mc_secondary_handler[];
static unsigned int *opal_irqs;
static unsigned int opal_irq_count;
static ATOMIC_NOTIFIER_HEAD(opal_notifier_head);
static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX];
static DEFINE_SPINLOCK(opal_notifier_lock);
static uint64_t last_notified_mask = 0x0ul;
static atomic_t opal_notifier_hold = ATOMIC_INIT(0);

static void opal_reinit_cores(void)
{
	/* Do the actual re-init, This will clobber all FPRs, VRs, etc...
	 *
	 * It will preserve non volatile GPRs and HSPRG0/1. It will
	 * also restore HIDs and other SPRs to their original value
	 * but it might clobber a bunch.
	 */
#ifdef __BIG_ENDIAN__
	opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE);
#else
	opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE);
#endif
}

int __init early_init_dt_scan_opal(unsigned long node,
				   const char *uname, int depth, void *data)
{
	const void *basep, *entryp, *sizep;
	int basesz, entrysz, runtimesz;

	if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
		return 0;

	basep  = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
	entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);
	sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz);

	if (!basep || !entryp || !sizep)
		return 1;

	opal.base = of_read_number(basep, basesz/4);
	opal.entry = of_read_number(entryp, entrysz/4);
	opal.size = of_read_number(sizep, runtimesz/4);

	pr_debug("OPAL Base  = 0x%llx (basep=%p basesz=%d)\n",
		 opal.base, basep, basesz);
	pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n",
		 opal.entry, entryp, entrysz);
	pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n",
		 opal.size, sizep, runtimesz);

	powerpc_firmware_features |= FW_FEATURE_OPAL;
	if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) {
		powerpc_firmware_features |= FW_FEATURE_OPALv2;
		powerpc_firmware_features |= FW_FEATURE_OPALv3;
		printk("OPAL V3 detected !\n");
	} else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) {
		powerpc_firmware_features |= FW_FEATURE_OPALv2;
		printk("OPAL V2 detected !\n");
	} else {
		printk("OPAL V1 detected !\n");
	}

	/* Reinit all cores with the right endian */
	opal_reinit_cores();

	/* Restore some bits */
	if (cur_cpu_spec->cpu_restore)
		cur_cpu_spec->cpu_restore();

	return 1;
}

int __init early_init_dt_scan_recoverable_ranges(unsigned long node,
				   const char *uname, int depth, void *data)
{
	int i, psize, size;
	const __be32 *prop;

	if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
		return 0;

	prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize);

	if (!prop)
		return 1;

	pr_debug("Found machine check recoverable ranges.\n");

	/*
	 * Calculate number of available entries.
	 *
	 * Each recoverable address range entry is (start address, len,
	 * recovery address), 2 cells each for start and recovery address,
	 * 1 cell for len, totalling 5 cells per entry.
	 */
	mc_recoverable_range_len = psize / (sizeof(*prop) * 5);

	/* Sanity check */
	if (!mc_recoverable_range_len)
		return 1;

	/* Size required to hold all the entries. */
	size = mc_recoverable_range_len *
			sizeof(struct mcheck_recoverable_range);

	/*
	 * Allocate a buffer to hold the MC recoverable ranges. We would be
	 * accessing them in real mode, hence it needs to be within
	 * RMO region.
	 */
	mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64),
							ppc64_rma_size));
	memset(mc_recoverable_range, 0, size);

	for (i = 0; i < mc_recoverable_range_len; i++) {
		mc_recoverable_range[i].start_addr =
					of_read_number(prop + (i * 5) + 0, 2);
		mc_recoverable_range[i].end_addr =
					mc_recoverable_range[i].start_addr +
					of_read_number(prop + (i * 5) + 2, 1);
		mc_recoverable_range[i].recover_addr =
					of_read_number(prop + (i * 5) + 3, 2);

		pr_debug("Machine check recoverable range: %llx..%llx: %llx\n",
				mc_recoverable_range[i].start_addr,
				mc_recoverable_range[i].end_addr,
				mc_recoverable_range[i].recover_addr);
	}
	return 1;
}

static int __init opal_register_exception_handlers(void)
{
#ifdef __BIG_ENDIAN__
	u64 glue;

	if (!(powerpc_firmware_features & FW_FEATURE_OPAL))
		return -ENODEV;

	/* Hookup some exception handlers except machine check. We use the
	 * fwnmi area at 0x7000 to provide the glue space to OPAL
	 */
	glue = 0x7000;
	opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);
#endif

	return 0;
}
machine_early_initcall(powernv<