1 files changed, 89 insertions, 0 deletions
diff --git a/board/jse/host_bridge.c b/board/jse/host_bridge.c
new file mode 100644
index 0000000..d687445
--- /dev/null
+++ b/board/jse/host_bridge.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2004 Picture Elements, Inc.
+ *    Stephen Williams (steve@icarus.com)
+ *
+ *    This source code is free software; you can redistribute it
+ *    and/or modify it in source code form under the terms of the GNU
+ *    General Public License as published by the Free Software
+ *    Foundation; either version 2 of the License, or (at your option)
+ *    any later version.
+ *
+ *    This program 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 this program; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+#ident "$Id:$"
+
+# include  <common.h>
+# include  <pci.h>
+# include  "jse_priv.h"
+
+/*
+ * The JSE board has an Intel 21555 non-transparent bridge for
+ * communication with the host. We need to render it harmless on the
+ * JSE side, but leave it alone on the host (primary) side. Normally,
+ * this will all be done before the host BIOS can gain access to the
+ * board, due to the Primary Access Lockout bit.
+ *
+ * The host_bridge_init function is called as a late initialization
+ * function, after most of the board is set up, including a PCI scan.
+ */
+
+void host_bridge_init (void)
+{
+	/* The bridge chip is at a fixed location. */
+	pci_dev_t dev = PCI_BDF (0, 10, 0);
+
+	int rc;
+	u32 val32;
+
+	rc = pci_read_config_dword (dev, 0, &val32);
+
+	/* Set subsystem ID --
+	   The primary side sees this value at 0x2c. We set it here so
+	   that the host can tell what sort of device this is:
+	   We are a Picture Elements [0x12c5] JSE [0x008a]. */
+	pci_write_config_dword (dev, 0x6c, 0x008a12c5);
+
+	/* Downstream (Primary-to-Secondary) BARs are set up mostly
+	   off. We need only the Memory-0 Bar so that the host can get
+	   at the CSR region to set up tables and the lot. */
+
+	/* Downstream Memory 0 setup (4K for CSR) */
+	pci_write_config_dword (dev, 0xac, 0xfffff000);
+	/* Downstream Memory 1 setup (off) */
+	pci_write_config_dword (dev, 0xb0, 0x00000000);
+	/* Downstream Memory 2 setup (off) */
+	pci_write_config_dword (dev, 0xb4, 0x00000000);
+	/* Downstream Memory 3 setup (off) */
+	pci_write_config_dword (dev, 0xb8, 0x00000000);
+
+	/* Upstream (Secondary-to-Primary) BARs are used to get at
+	   host memory from the JSE card. Create two regions: a small
+	   one to manage individual word reads/writes, and a larger
+	   one for doing bulk frame moves. */
+
+	/* Upstream Memory 0 Setup -- (BAR2) 4K non-prefetchable */
+	pci_write_config_dword (dev, 0xc4, 0xfffff000);
+	/* Upstream Memory 1 setup -- (BAR3) 4K non-prefetchable */
+	pci_write_config_dword (dev, 0xc8, 0xfffff000);
+
+	/* Upstream Memory 2 (BAR4) uses page translation, and is set
+	   up in CCR1. Configure for 4K pages. */
+
+	/* Set CCR1,0 reigsters. This clears the Primary PCI Lockout
+	   bit as well, so we are done configuring after this
+	   point. Therefore, this must be the last step.
+
+	   CC1[15:12]= 0  (disable I2O message unit)
+	   CC1[11:8] = 0x5 (4K page size)
+	   CC0[11]   = 1  (Secondary Clock Disable: disable clock)
+	   CC0[10]   = 0  (Primary Access Lockout: allow primary access)
+	 */
+	pci_write_config_dword (dev, 0xcc, 0x05000800);
+}