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authorwdenk <wdenk>2004-04-15 23:14:49 +0000
committerwdenk <wdenk>2004-04-15 23:14:49 +0000
commitdb01a2ea991b539ffbd36ab952fcf2e754789a83 (patch)
tree8514a5df0b86fe3315a29fd9068093da43f3b3ca /board/jse/host_bridge.c
parentbda6c8aece36f4f21cb041f518d09c26e4fb47eb (diff)
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* Patch by Stephen Williams, 01 Apr 2004:
Add support for Picture Elements JSE board * Patch by Christian Pell, 01 Apr 2004: Add CompactFlash support for PXA systems.
Diffstat (limited to 'board/jse/host_bridge.c')
-rw-r--r--board/jse/host_bridge.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/board/jse/host_bridge.c b/board/jse/host_bridge.c
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+++ b/board/jse/host_bridge.c
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+/*
+ * 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);
+}