From b0b1b81a11f8bae8ab9e8edd87ac3f4f7949d03b Mon Sep 17 00:00:00 2001

From: Vladimir Serbinenko <phcoder@gmail.com>

Date: Tue, 9 May 2017 08:42:14 +0200

Subject: [PATCH 032/216] rk3288_spi: Add SPI driver

---

 grub-core/Makefile.core.def        |   1 +

 grub-core/bus/spi/rk3288_spi.c     | 103 +++++++++++++++++++++++++++++++++++++

 grub-core/kern/arm/coreboot/init.c |   2 +

 include/grub/arm/coreboot/kernel.h |   4 +-

 4 files changed, 108 insertions(+), 2 deletions(-)

 create mode 100644 grub-core/bus/spi/rk3288_spi.c

diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def

index 5ce506597a6..d2239f1718d 100644

--- a/grub-core/Makefile.core.def

+++ b/grub-core/Makefile.core.def

@@ -162,6 +162,7 @@ kernel = {

   arm_coreboot = bus/fdt.c;

   arm_coreboot = term/ps2.c;

   arm_coreboot = term/arm/pl050.c;

+  arm_coreboot = bus/spi/rk3288_spi.c;

   arm_coreboot = commands/keylayouts.c;

   arm_coreboot = kern/arm/coreboot/dma.c;

diff --git a/grub-core/bus/spi/rk3288_spi.c b/grub-core/bus/spi/rk3288_spi.c

new file mode 100644

index 00000000000..aacb79ffef1

--- /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;;

+}

diff --git a/grub-core/kern/arm/coreboot/init.c b/grub-core/kern/arm/coreboot/init.c

index a06ccb72f42..0126ff6381a 100644

--- a/grub-core/kern/arm/coreboot/init.c

+++ b/grub-core/kern/arm/coreboot/init.c

@@ -132,6 +132,8 @@ grub_machine_init (void)

     grub_fatal ("No DTB found");

   grub_fdtbus_init (dtb, dtb_size);

+  grub_rk3288_spi_init ();

+

   grub_machine_timer_init ();

   grub_pl050_init ();

 }

diff --git a/include/grub/arm/coreboot/kernel.h b/include/grub/arm/coreboot/kernel.h

index 09cd7fe328c..26950534270 100644

--- a/include/grub/arm/coreboot/kernel.h

+++ b/include/grub/arm/coreboot/kernel.h

@@ -34,8 +34,8 @@ struct grub_fdt_board

 extern struct grub_fdt_board grub_fdt_boards[];

 void grub_machine_timer_init (void);

 void grub_pl050_init (void);

-void

-grub_cros_init (void);

+void grub_cros_init (void);

+void grub_rk3288_spi_init (void);

 extern grub_addr_t EXPORT_VAR (start_of_ram);

 #endif /* ! ASM_FILE */

-- 

2.15.0