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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:29:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:29:51 +0000 |
commit | 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e (patch) | |
tree | 32451fa3cdd9321fb2591fada9891b2cb70a9cd1 /grub-core/bus/spi | |
parent | Initial commit. (diff) | |
download | grub2-6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e.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.c | 103 |
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); +} |