summaryrefslogtreecommitdiffstats
path: root/grub-core/bus/spi
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:29:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:29:51 +0000
commit6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e (patch)
tree32451fa3cdd9321fb2591fada9891b2cb70a9cd1 /grub-core/bus/spi
parentInitial commit. (diff)
downloadgrub2-6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e.tar.xz
grub2-6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e.zip
Adding upstream version 2.06.upstream/2.06upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'grub-core/bus/spi')
-rw-r--r--grub-core/bus/spi/rk3288_spi.c103
1 files changed, 103 insertions, 0 deletions
diff --git a/grub-core/bus/spi/rk3288_spi.c b/grub-core/bus/spi/rk3288_spi.c
new file mode 100644
index 0000000..aacb79f
--- /dev/null
+++ b/grub-core/bus/spi/rk3288_spi.c
@@ -0,0 +1,103 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ *
+ * Copyright (C) 2012 Google Inc.
+ * Copyright (C) 2016 Free Software Foundation, Inc.
+ *
+ * This is based on depthcharge code.
+ *
+ * GRUB 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/mm.h>
+#include <grub/time.h>
+#include <grub/misc.h>
+#include <grub/fdtbus.h>
+#include <grub/machine/kernel.h>
+
+static grub_err_t
+spi_send (const struct grub_fdtbus_dev *dev, const void *data, grub_size_t sz)
+{
+ const grub_uint8_t *ptr = data, *end = ptr + sz;
+ volatile grub_uint32_t *spi = grub_fdtbus_map_reg (dev, 0, 0);
+ spi[2] = 0;
+ spi[1] = sz - 1;
+ spi[0] = ((1 << 18) | spi[0]) & ~(1 << 19);
+ spi[2] = 1;
+ while (ptr < end)
+ {
+ while (spi[9] & 2);
+ spi[256] = *ptr++;
+ }
+ while (spi[9] & 1);
+ return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+spi_receive (const struct grub_fdtbus_dev *dev, void *data, grub_size_t sz)
+{
+ grub_uint8_t *ptr = data, *end = ptr + sz;
+ volatile grub_uint32_t *spi = grub_fdtbus_map_reg (dev, 0, 0);
+ spi[2] = 0;
+ spi[1] = sz - 1;
+ spi[0] = ((1 << 19) | spi[0]) & ~(1 << 18);
+ spi[2] = 1;
+ while (ptr < end)
+ {
+ while (spi[9] & 8);
+ *ptr++ = spi[512];
+ }
+ while (spi[9] & 1);
+ return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+spi_start (const struct grub_fdtbus_dev *dev)
+{
+ volatile grub_uint32_t *spi = grub_fdtbus_map_reg (dev, 0, 0);
+ spi[3] = 1;
+ return GRUB_ERR_NONE;
+}
+
+static void
+spi_stop (const struct grub_fdtbus_dev *dev)
+{
+ volatile grub_uint32_t *spi = grub_fdtbus_map_reg (dev, 0, 0);
+ spi[3] = 0;
+}
+
+static grub_err_t
+spi_attach(const struct grub_fdtbus_dev *dev)
+{
+ if (!grub_fdtbus_is_mapping_valid (grub_fdtbus_map_reg (dev, 0, 0)))
+ return GRUB_ERR_IO;
+
+ return GRUB_ERR_NONE;
+}
+
+static struct grub_fdtbus_driver spi =
+{
+ .compatible = "rockchip,rk3288-spi",
+ .attach = spi_attach,
+ .send = spi_send,
+ .receive = spi_receive,
+ .start = spi_start,
+ .stop = spi_stop,
+};
+
+void
+grub_rk3288_spi_init (void)
+{
+ grub_fdtbus_register (&spi);
+}