103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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*
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* Copyright (C) 2012 Google Inc.
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* Copyright (C) 2016 Free Software Foundation, Inc.
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*
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* This is based on depthcharge code.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/mm.h>
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#include <grub/time.h>
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#include <grub/misc.h>
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#include <grub/fdtbus.h>
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#include <grub/machine/kernel.h>
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static grub_err_t
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spi_send (const struct grub_fdtbus_dev *dev, const void *data, grub_size_t sz)
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{
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const grub_uint8_t *ptr = data, *end = ptr + sz;
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volatile grub_uint32_t *spi = grub_fdtbus_map_reg (dev, 0, 0);
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spi[2] = 0;
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spi[1] = sz - 1;
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spi[0] = ((1 << 18) | spi[0]) & ~(1 << 19);
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spi[2] = 1;
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while (ptr < end)
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{
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while (spi[9] & 2);
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spi[256] = *ptr++;
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}
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while (spi[9] & 1);
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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spi_receive (const struct grub_fdtbus_dev *dev, void *data, grub_size_t sz)
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{
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grub_uint8_t *ptr = data, *end = ptr + sz;
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volatile grub_uint32_t *spi = grub_fdtbus_map_reg (dev, 0, 0);
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spi[2] = 0;
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spi[1] = sz - 1;
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spi[0] = ((1 << 19) | spi[0]) & ~(1 << 18);
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spi[2] = 1;
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while (ptr < end)
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{
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while (spi[9] & 8);
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*ptr++ = spi[512];
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}
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while (spi[9] & 1);
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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spi_start (const struct grub_fdtbus_dev *dev)
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{
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volatile grub_uint32_t *spi = grub_fdtbus_map_reg (dev, 0, 0);
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spi[3] = 1;
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return GRUB_ERR_NONE;
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}
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static void
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spi_stop (const struct grub_fdtbus_dev *dev)
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{
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volatile grub_uint32_t *spi = grub_fdtbus_map_reg (dev, 0, 0);
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spi[3] = 0;
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}
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static grub_err_t
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spi_attach(const struct grub_fdtbus_dev *dev)
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{
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if (!grub_fdtbus_is_mapping_valid (grub_fdtbus_map_reg (dev, 0, 0)))
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return GRUB_ERR_IO;
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return GRUB_ERR_NONE;
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}
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static struct grub_fdtbus_driver spi =
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{
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.compatible = "rockchip,rk3288-spi",
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.attach = spi_attach,
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.send = spi_send,
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.receive = spi_receive,
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.start = spi_start,
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.stop = spi_stop,
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};
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void
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grub_rk3288_spi_init (void)
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{
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grub_fdtbus_register (&spi);
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}
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