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Create root DMA tag and fix MBUS windows on DMA coherent platforms

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Armada 38x SoCs, in order to work properly in IO-coherent mode,
requires an update of the MBUS windows attributesd.

This patch also configures nexus coherent dma tag, because all
busses and children devices have to inherit this setting in runtime.
The latter has to be executed as a sysinit (SI_SUB_DRIVERS type),
so that bus_dma_tag_create() can be executed properly.

Submitted by: Michal Mazur <mkm@semihalf.com>
 	      Marcin Wojtas <mw@semihalf.com>
Obtained from: Semihalf
Sponsored by: Stormshield
Reviewed by: ian
Differential revision: https://reviews.freebsd.org/D11203
This commit is contained in:
Zbigniew Bodek 2017-06-21 18:27:05 +00:00
parent 474612c372
commit 3361fdc431
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=320199
2 changed files with 47 additions and 2 deletions
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13
sys/arm/mv/mv_common.c
View File

@ -128,6 +128,7 @@ static uint32_t dev_mask = 0;
static int cpu_wins_no = 0;
static int eth_port = 0;
static int usb_port = 0;
static boolean_t platform_io_coherent = false;
static struct decode_win cpu_win_tbl[MAX_CPU_WIN];
@ -1064,7 +1065,7 @@ ddr_size(int i)
uint32_t
ddr_attr(int i)
{
uint32_t dev, rev;
uint32_t dev, rev, attr;
soc_id(&dev, &rev);
if (dev == MV_DEV_88RC8180)
@ -1072,10 +1073,14 @@ ddr_attr(int i)
if (dev == MV_DEV_88F6781)
return (0);
return (i == 0 ? 0xe :
attr = (i == 0 ? 0xe :
(i == 1 ? 0xd :
(i == 2 ? 0xb :
(i == 3 ? 0x7 : 0xff))));
if (platform_io_coherent)
attr |= 0x10;
return (attr);
}
uint32_t
@ -2479,6 +2484,10 @@ fdt_win_setup(void)
if (node == -1)
panic("fdt_win_setup: no root node");
/* Allow for coherent transactions on the A38x MBUS */
if (ofw_bus_node_is_compatible(node, "marvell,armada380"))
platform_io_coherent = true;
/*
* Traverse through all children of root and simple-bus nodes.
* For each found device retrieve decode windows data (if applicable).

36
sys/arm/mv/mv_machdep.c
View File

@ -46,10 +46,13 @@ __FBSDID("$FreeBSD$");
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/devmap.h>
#include <sys/kernel.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <arm/arm/nexusvar.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <machine/machdep.h>
@ -87,6 +90,39 @@ int armada38x_mbus_optimization(void);
#define MPP_SEL(pin,func) (((func) & 0xf) << \
(((pin) % MPP_PINS_PER_REG) * 4))
static void
mv_busdma_tag_init(void *arg __unused)
{
phandle_t node;
bus_dma_tag_t dmat;
/*
* If this platform has coherent DMA, create the parent DMA tag to pass
* down the coherent flag to all busses and devices on the platform,
* otherwise return without doing anything. By default create tag
* for all A38x-based platforms only.
*/
if ((node = OF_finddevice("/")) == -1)
return;
if (ofw_bus_node_is_compatible(node, "marvell,armada380") == 0)
return;
bus_dma_tag_create(NULL, /* No parent tag */
1, 0, /* alignment, bounds */
BUS_SPACE_MAXADDR, /* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
BUS_SPACE_MAXSIZE, /* maxsize */
BUS_SPACE_UNRESTRICTED, /* nsegments */
BUS_SPACE_MAXSIZE, /* maxsegsize */
BUS_DMA_COHERENT, /* flags */
NULL, NULL, /* lockfunc, lockarg */
&dmat);
nexus_set_dma_tag(dmat);
}
SYSINIT(mv_busdma_tag, SI_SUB_DRIVERS, SI_ORDER_ANY, mv_busdma_tag_init, NULL);
static int
platform_mpp_init(void)
{