From: John Crispin <john@openwrt.org>
Date: Thu, 18 Mar 2010 10:56:00 +0000 (+0000)
Subject: Make it possible for boards to disable PCI REQ signals in the PCI controller, signed... 
X-Git-Tag: reboot~20610
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=10af553b63e4e81ff05639def4c04fc62b29fcb2;p=openwrt%2Fopenwrt.git

Make it possible for boards to disable PCI REQ signals in the PCI controller, signed off by Ithamar R. Adema

SVN-Revision: 20264
---

diff --git a/target/linux/ifxmips/files/arch/mips/ifxmips/board.c b/target/linux/ifxmips/files/arch/mips/ifxmips/board.c
index 7d77e9ce6b..6a17f60bd4 100644
--- a/target/linux/ifxmips/files/arch/mips/ifxmips/board.c
+++ b/target/linux/ifxmips/files/arch/mips/ifxmips/board.c
@@ -55,6 +55,7 @@ enum {
 };
 
 extern int ifxmips_pci_external_clock;
+extern int ifxmips_pci_req_mask;
 
 static unsigned int chiprev;
 static int cmdline_mac;
@@ -70,6 +71,7 @@ struct ifxmips_board {
 	struct gpio_led *ifxmips_leds;
 	struct gpio_led *gpio_leds;
 	int pci_external_clock;
+	int pci_req_mask;
 	int num_devs;
 };
 
@@ -392,6 +394,8 @@ int __init ifxmips_init_devices(void)
 	ifxmips_gpio_dev.resource = &board->gpiodev_resource;
 	if (board->pci_external_clock)
 		ifxmips_pci_external_clock = 1;
+	if (board->pci_req_mask)
+		ifxmips_pci_req_mask = board->pci_req_mask;
 	printk(KERN_INFO "using board definition %s\n", board->name);
 	return platform_add_devices(board->devs, board->num_devs);
 }
diff --git a/target/linux/ifxmips/files/arch/mips/pci/pci-ifxmips.c b/target/linux/ifxmips/files/arch/mips/pci/pci-ifxmips.c
index 64f37d5564..6ff765e85f 100644
--- a/target/linux/ifxmips/files/arch/mips/pci/pci-ifxmips.c
+++ b/target/linux/ifxmips/files/arch/mips/pci/pci-ifxmips.c
@@ -54,6 +54,10 @@ static struct pci_controller ifxmips_pci_controller =
 u32 ifxmips_pci_mapped_cfg;
 int ifxmips_pci_external_clock = 0;
 
+/* Since the PCI REQ pins can be reused for other functionality, make it possible
+   to exclude those from interpretation by the PCI controller */
+int ifxmips_pci_req_mask = 0xf;
+
 static int __init
 ifxmips_pci_set_external_clk(char *str)
 {
@@ -126,7 +130,7 @@ ifxmips_pci_startup(void)
 
 	/* enable external 2 PCI masters */
 	temp_buffer = ifxmips_r32(PCI_CR_PC_ARB);
-	temp_buffer &= (~(0xf << 16));
+	temp_buffer &= (~(ifxmips_pci_req_mask << 16));
 	/* enable internal arbiter */
 	temp_buffer |= (1 << INTERNAL_ARB_ENABLE_BIT);
 	/* enable internal PCI master reqest */