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 c2b9478..c96845c 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 be22bdb..16cbcee 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