motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-07 09:43:56 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

hw/arm: xlnx-versal-virt: Add Xilinx BBRAM device

Browse source 
Connect the support for Versal Battery-Backed RAM (BBRAM)

The command argument:
  -drive if=pflash,index=0,...
Can be used to optionally connect the bbram to a backend
storage, such that field-programmed values in one
invocation can be made available to next invocation.

The backend storage must be a seekable binary file, and
its size must be 36 bytes or larger. A file with all
binary 0's is a 'blank'.

Signed-off-by: Tong Ho <tong.ho@xilinx.com>
Message-id: 20210917052400.1249094-6-tong.ho@xilinx.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Tong Ho 2021-09-16 22:23:56 -07:00 • committed by Peter Maydell
parent 461a6a6f19
commit 393185bc9d
4 changed files with 60 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

36
hw/arm/xlnx-versal-virt.c
View file

@ -356,6 +356,26 @@ static void fdt_add_rtc_node(VersalVirt *s)
g_free(name);
}
static void fdt_add_bbram_node(VersalVirt *s)
{
const char compat[] = TYPE_XLNX_BBRAM;
const char interrupt_names[] = "bbram-error";
char *name = g_strdup_printf("/bbram@%x", MM_PMC_BBRAM_CTRL);
qemu_fdt_add_subnode(s->fdt, name);
qemu_fdt_setprop_cells(s->fdt, name, "interrupts",
GIC_FDT_IRQ_TYPE_SPI, VERSAL_BBRAM_APB_IRQ_0,
GIC_FDT_IRQ_FLAGS_LEVEL_HI);
qemu_fdt_setprop(s->fdt, name, "interrupt-names",
interrupt_names, sizeof(interrupt_names));
qemu_fdt_setprop_sized_cells(s->fdt, name, "reg",
2, MM_PMC_BBRAM_CTRL,
2, MM_PMC_BBRAM_CTRL_SIZE);
qemu_fdt_setprop(s->fdt, name, "compatible", compat, sizeof(compat));
g_free(name);
}
static void fdt_nop_memory_nodes(void *fdt, Error **errp)
{
Error *err = NULL;
@ -510,6 +530,18 @@ static void create_virtio_regions(VersalVirt *s)
}
}
static void bbram_attach_drive(XlnxBBRam *dev)
{
DriveInfo *dinfo;
BlockBackend *blk;
dinfo = drive_get_by_index(IF_PFLASH, 0);
blk = dinfo ? blk_by_legacy_dinfo(dinfo) : NULL;
if (blk) {
qdev_prop_set_drive(DEVICE(dev), "drive", blk);
}
}
static void sd_plugin_card(SDHCIState *sd, DriveInfo *di)
{
BlockBackend *blk = di ? blk_by_legacy_dinfo(di) : NULL;
@ -570,6 +602,7 @@ static void versal_virt_init(MachineState *machine)
fdt_add_usb_xhci_nodes(s);
fdt_add_sd_nodes(s);
fdt_add_rtc_node(s);
fdt_add_bbram_node(s);
fdt_add_cpu_nodes(s, psci_conduit);
fdt_add_clk_node(s, "/clk125", 125000000, s->phandle.clk_125Mhz);
fdt_add_clk_node(s, "/clk25", 25000000, s->phandle.clk_25Mhz);
@ -579,6 +612,9 @@ static void versal_virt_init(MachineState *machine)
memory_region_add_subregion_overlap(get_system_memory(),
0, &s->soc.fpd.apu.mr, 0);
/* Attach bbram backend, if given */
bbram_attach_drive(&s->soc.pmc.bbram);
/* Plugin SD cards. */
for (i = 0; i < ARRAY_SIZE(s->soc.pmc.iou.sd); i++) {
sd_plugin_card(&s->soc.pmc.iou.sd[i], drive_get_next(IF_SD));