xref: /src/sys/arch/arm/cortex/pl310.c

/*	$NetBSD: pl310.c,v 1.9 2012/11/28 22:48:13 matt Exp $	*/

/*-
 * Copyright (c) 2012 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Matt Thomas
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pl310.c,v 1.9 2012/11/28 22:48:13 matt Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <sys/device.h>
#include <sys/atomic.h>

#include <arm/cortex/mpcore_var.h>
#include <arm/cortex/pl310_reg.h>
#include <arm/cortex/pl310_var.h>

static int arml2cc_match(device_t, cfdata_t, void *);
static void arml2cc_attach(device_t, device_t, void *);

#define	L2CC_BASE	0x2000
#define	L2CC_SIZE	0x1000

struct arml2cc_softc {
	device_t sc_dev;
	bus_space_tag_t sc_memt;
	bus_space_handle_t sc_memh;
	kmutex_t sc_lock;
	uint32_t sc_waymask;
	struct evcnt sc_ev_inv __aligned(8);
	struct evcnt sc_ev_wb;
	struct evcnt sc_ev_wbinv;
	bool sc_enabled;
};

__CTASSERT(offsetof(struct arml2cc_softc, sc_ev_inv.ev_count) % 8 == 0);
__CTASSERT(offsetof(struct arml2cc_softc, sc_ev_wb.ev_count) % 8 == 0);
__CTASSERT(offsetof(struct arml2cc_softc, sc_ev_wbinv.ev_count) % 8 == 0);

CFATTACH_DECL_NEW(arml2cc, sizeof(struct arml2cc_softc),
    arml2cc_match, arml2cc_attach, NULL, NULL);

static inline void arml2cc_disable(struct arml2cc_softc *);
static inline void arml2cc_enable(struct arml2cc_softc *);
static void arml2cc_sdcache_wb_range(vaddr_t, paddr_t, psize_t);
static void arml2cc_sdcache_inv_range(vaddr_t, paddr_t, psize_t);
static void arml2cc_sdcache_wbinv_range(vaddr_t, paddr_t, psize_t);

static struct arml2cc_softc *arml2cc_sc;

static inline uint32_t
arml2cc_read_4(struct arml2cc_softc *sc, bus_size_t o)
{
	return bus_space_read_4(sc->sc_memt, sc->sc_memh, o);
}

static inline void
arml2cc_write_4(struct arml2cc_softc *sc, bus_size_t o, uint32_t v)
{
	bus_space_write_4(sc->sc_memt, sc->sc_memh, o, v);
}


/* ARGSUSED */
static int
arml2cc_match(device_t parent, cfdata_t cf, void *aux)
{
	struct mpcore_attach_args * const mpcaa = aux;

	if (arml2cc_sc)
		return 0;

	if (!CPU_ID_CORTEX_A9_P(curcpu()->ci_arm_cpuid))
		return 0;

	if (strcmp(mpcaa->mpcaa_name, cf->cf_name) != 0)
		return 0;

	/*
	 * This isn't present on UP A9s (since CBAR isn't present).
	 */
	uint32_t mpidr = armreg_mpidr_read();
	if (mpidr == 0 || (mpidr & MPIDR_U))
		return 0;

	return 1;
}

static const struct {
	uint8_t rev;
	uint8_t str[7];
} pl310_revs[] = {
	{ 0, " r0p0" },
	{ 2, " r1p0" },
	{ 4, " r2p0" },
	{ 5, " r3p0" },
	{ 6, " r3p1" },
	{ 8, " r3p2" },
	{ 9, " r3p3" },
};

static void
arml2cc_attach(device_t parent, device_t self, void *aux)
{
        struct arml2cc_softc * const sc = device_private(self);
	struct mpcore_attach_args * const mpcaa = aux;
	const char * const xname = device_xname(self);

	arml2cc_sc = sc;
	sc->sc_dev = self;
	sc->sc_memt = mpcaa->mpcaa_memt;
	sc->sc_waymask = __BIT(arm_scache.dcache_ways) - 1;

	evcnt_attach_dynamic(&sc->sc_ev_inv, EVCNT_TYPE_MISC, NULL,
	    xname, "L2 inv requests");
	evcnt_attach_dynamic(&sc->sc_ev_wb, EVCNT_TYPE_MISC, NULL,
	    xname, "L2 wb requests");
	evcnt_attach_dynamic(&sc->sc_ev_wbinv, EVCNT_TYPE_MISC, NULL,
	    xname, "L2 wbinv requests");

	mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_HIGH);

	bus_space_subregion(sc->sc_memt, mpcaa->mpcaa_memh,
	    L2CC_BASE, L2CC_SIZE, &sc->sc_memh);

	uint32_t id = arml2cc_read_4(sc, L2C_CACHE_ID);
	u_int rev = __SHIFTOUT(id, CACHE_ID_REV);

	const char *revstr = "";
	for (size_t i = 0; i < __arraycount(pl310_revs); i++) {
		if (rev == pl310_revs[i].rev) {
			revstr = pl310_revs[i].str;
			break;
		}
	}

	const bool enabled_p = arml2cc_read_4(sc, L2C_CTL) != 0;

	aprint_naive("\n");
	aprint_normal(": ARM PL310%s L2 Cache Controller%s\n",
	    revstr, enabled_p ? "" : " (disabled)");

	if (enabled_p) {
		if (device_cfdata(self)->cf_flags & 1) {
			arml2cc_disable(sc);
			aprint_normal_dev(self, "cache %s\n",
			    arml2cc_read_4(sc, L2C_CTL) ? "enabled" : "disabled");
			sc->sc_enabled = false;
		} else {
			cpufuncs.cf_sdcache_wb_range = arml2cc_sdcache_wb_range;
			cpufuncs.cf_sdcache_inv_range = arml2cc_sdcache_inv_range;
			cpufuncs.cf_sdcache_wbinv_range = arml2cc_sdcache_wbinv_range;
			sc->sc_enabled = true;
		}
	} else if ((device_cfdata(self)->cf_flags & 1) == 0) {
		if (!enabled_p) {
			arml2cc_enable(sc);
			aprint_normal_dev(self, "cache %s\n",
			    arml2cc_read_4(sc, L2C_CTL) ? "enabled" : "disabled");
		}
		cpufuncs.cf_sdcache_wb_range = arml2cc_sdcache_wb_range;
		cpufuncs.cf_sdcache_inv_range = arml2cc_sdcache_inv_range;
		cpufuncs.cf_sdcache_wbinv_range = arml2cc_sdcache_wbinv_range;
		sc->sc_enabled = true;
	}

	KASSERT(arm_pcache.dcache_line_size == arm_scache.dcache_line_size);
}

static inline void
arml2cc_cache_op(struct arml2cc_softc *sc, bus_size_t off, uint32_t val)
{
	arml2cc_write_4(sc, off, val);
	while (arml2cc_read_4(sc, off) & 1) {
		/* spin */
	}
}

static inline void
arml2cc_cache_way_op(struct arml2cc_softc *sc, bus_size_t off, uint32_t way_mask)
{
	arml2cc_write_4(sc, off, way_mask);
	while (arml2cc_read_4(sc, off) & way_mask) {
		/* spin */
	}
}

static inline void
arml2cc_cache_sync(struct arml2cc_softc *sc)
{
	arml2cc_cache_op(sc, L2C_CACHE_SYNC, 0);
}

static inline void
arml2cc_disable(struct arml2cc_softc *sc)
{
	mutex_spin_enter(&sc->sc_lock);

	arml2cc_cache_way_op(sc, L2C_CLEAN_INV_WAY, sc->sc_waymask);
	arml2cc_cache_sync(sc);

	arml2cc_write_4(sc, L2C_CTL, 0);	// turn it off
	mutex_spin_exit(&sc->sc_lock);
}

static inline void
arml2cc_enable(struct arml2cc_softc *sc)
{
	mutex_spin_enter(&sc->sc_lock);

	arml2cc_write_4(sc, L2C_CTL, 1);	// turn it on

	arml2cc_cache_way_op(sc, L2C_INV_WAY, sc->sc_waymask);
	arml2cc_cache_sync(sc);

	mutex_spin_exit(&sc->sc_lock);
}

void
arml2cc_init(bus_space_tag_t bst, bus_space_handle_t bsh, bus_size_t o)
{
	struct arm_cache_info * const info = &arm_scache;

	uint32_t cfg = bus_space_read_4(bst, bsh, o + L2C_CACHE_TYPE);

	info->cache_type = __SHIFTOUT(cfg, CACHE_TYPE_CTYPE);
	info->cache_unified = __SHIFTOUT(cfg, CACHE_TYPE_HARVARD) == 0;
	u_int cfg_dsize = __SHIFTOUT(cfg, CACHE_TYPE_DSIZE);

	u_int d_waysize = 8192 << __SHIFTOUT(cfg_dsize, CACHE_TYPE_xWAYSIZE);
	info->dcache_ways = 8 << __SHIFTOUT(cfg_dsize, CACHE_TYPE_xASSOC);
	info->dcache_line_size = 32 << __SHIFTOUT(cfg_dsize, CACHE_TYPE_xLINESIZE);
	info->dcache_size = info->dcache_ways * d_waysize;

	if (info->cache_unified) {
		info->icache_ways = info->dcache_ways;
		info->icache_line_size = info->dcache_line_size;
		info->icache_size = info->dcache_size;
	} else {
		u_int cfg_isize = __SHIFTOUT(cfg, CACHE_TYPE_ISIZE);
		u_int i_waysize = 8192 << __SHIFTOUT(cfg_isize, CACHE_TYPE_xWAYSIZE);
		info->icache_ways = 8 << __SHIFTOUT(cfg_isize, CACHE_TYPE_xASSOC);
		info->icache_line_size = 32 << __SHIFTOUT(cfg_isize, CACHE_TYPE_xLINESIZE);
		info->icache_size = i_waysize * info->icache_ways;
	}
}

static void
arml2cc_cache_range_op(paddr_t pa, psize_t len, bus_size_t cache_op)
{
	struct arml2cc_softc * const sc = arml2cc_sc;
	const size_t line_size = arm_scache.dcache_line_size;
	const size_t line_mask = line_size - 1;
	size_t off = pa & line_mask;
	if (off) {
		len += off;
		pa -= off;
	}
	len = roundup2(len, line_size);
	off = pa & PAGE_MASK;
	for (const paddr_t endpa = pa + len; pa < endpa; off = 0) {
		psize_t seglen = min(len, PAGE_SIZE - off);

		mutex_spin_enter(&sc->sc_lock);
		if (!sc->sc_enabled) {
			mutex_spin_exit(&sc->sc_lock);
			return;
		}
		for (paddr_t segend = pa + seglen; pa < segend; pa += line_size) {
			arml2cc_cache_op(sc, cache_op, pa);
		}
		mutex_spin_exit(&sc->sc_lock);
	}
}

static void
arml2cc_sdcache_inv_range(vaddr_t va, paddr_t pa, psize_t len)
{
	atomic_inc_64(&arml2cc_sc->sc_ev_inv.ev_count);
	arml2cc_cache_range_op(pa, len, L2C_INV_PA);
}

static void
arml2cc_sdcache_wb_range(vaddr_t va, paddr_t pa, psize_t len)
{
	atomic_inc_64(&arml2cc_sc->sc_ev_wb.ev_count);
	arml2cc_cache_range_op(pa, len, L2C_CLEAN_PA);
}

static void
arml2cc_sdcache_wbinv_range(vaddr_t va, paddr_t pa, psize_t len)
{
	atomic_inc_64(&arml2cc_sc->sc_ev_wbinv.ev_count);
	arml2cc_cache_range_op(pa, len, L2C_CLEAN_INV_PA);
}