From 58927a964e93e834fa7a0358f961d3a70b0502d6 Mon Sep 17 00:00:00 2001
From: "Karicheri, Muralidharan" <m-karicheri2@ti.com>
Date: Tue, 9 Dec 2014 14:32:26 -0500
Subject: [PATCH] keystone: set default pci mode to root complex
pci ports are used as root complex in Linux. So set this as default
in u-boot for keystone devices
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
---
arch/arm/cpu/armv7/keystone/init.c | 33 +++++++++++++++++++
arch/arm/include/asm/arch-keystone/hardware.h | 1 +
2 files changed, 34 insertions(+)
diff --git a/arch/arm/cpu/armv7/keystone/init.c b/arch/arm/cpu/armv7/keystone/init.c
index c2b947839d..c96845c4e2 100644
--- a/arch/arm/cpu/armv7/keystone/init.c
+++ b/arch/arm/cpu/armv7/keystone/init.c
@@ -15,6 +15,16 @@
#include <asm/arch/hardware.h>
#include <asm/arch/psc_defs.h>
+#define MAX_PCI_PORTS 2
+enum pci_mode {
+ ENDPOINT,
+ LEGACY_ENDPOINT,
+ ROOTCOMPLEX,
+};
+
+#define DEVCFG_MODE_MASK (BIT(2) | BIT(1))
+#define DEVCFG_MODE_SHIFT 1
+
void chip_configuration_unlock(void)
{
__raw_writel(KS2_KICK0_MAGIC, KS2_KICK0);
@@ -68,6 +78,24 @@ void osr_init(void)
}
#endif
+/* Function to set up PCIe mode */
+static void config_pcie_mode(int pcie_port, enum pci_mode mode)
+{
+ u32 val = __raw_readl(KS2_DEVCFG);
+
+ if (pcie_port >= MAX_PCI_PORTS)
+ return;
+
+ /**
+ * each pci port has two bits for mode and it starts at
+ * bit 1. So use port number to get the right bit position.
+ */
+ pcie_port <<= 1;
+ val &= ~(DEVCFG_MODE_MASK << pcie_port);
+ val |= ((mode << DEVCFG_MODE_SHIFT) << pcie_port);
+ __raw_writel(val, KS2_DEVCFG);
+}
+
int arch_cpu_init(void)
{
chip_configuration_unlock();
@@ -77,8 +105,13 @@ int arch_cpu_init(void)
msmc_share_all_segments(KS2_MSMC_SEGMENT_NETCP);
msmc_share_all_segments(KS2_MSMC_SEGMENT_QM_PDSP);
msmc_share_all_segments(KS2_MSMC_SEGMENT_PCIE0);
+
+ /* Initialize the PCIe-0 to work as Root Complex */
+ config_pcie_mode(0, ROOTCOMPLEX);
#if defined(CONFIG_SOC_K2E) || defined(CONFIG_SOC_K2L)
msmc_share_all_segments(KS2_MSMC_SEGMENT_PCIE1);
+ /* Initialize the PCIe-1 to work as Root Complex */
+ config_pcie_mode(1, ROOTCOMPLEX);
#endif
#ifdef CONFIG_SOC_K2L
osr_init();
diff --git a/arch/arm/include/asm/arch-keystone/hardware.h b/arch/arm/include/asm/arch-keystone/hardware.h
index be22bdb1ca..16cbcee12b 100644
--- a/arch/arm/include/asm/arch-keystone/hardware.h
+++ b/arch/arm/include/asm/arch-keystone/hardware.h
@@ -144,6 +144,7 @@ typedef volatile unsigned int *dv_reg_p;
#define KS2_DEVICE_STATE_CTRL_BASE 0x02620000
#define KS2_JTAG_ID_REG (KS2_DEVICE_STATE_CTRL_BASE + 0x18)
#define KS2_DEVSTAT (KS2_DEVICE_STATE_CTRL_BASE + 0x20)
+#define KS2_DEVCFG (KS2_DEVICE_STATE_CTRL_BASE + 0x14c)
/* PSC */
#define KS2_PSC_BASE 0x02350000
--
2.39.5