diff --git a/arch/x86/cpu/quark/quark.c b/arch/x86/cpu/quark/quark.c index 2688a707a7..7c55d9e5cd 100644 --- a/arch/x86/cpu/quark/quark.c +++ b/arch/x86/cpu/quark/quark.c @@ -73,6 +73,58 @@ static void quark_setup_bars(void) CONFIG_PCIE_ECAM_BASE | MEM_BAR_EN); } +static void quark_pcie_early_init(void) +{ + u32 pcie_cfg; + + /* + * Step1: Assert PCIe signal PERST# + * + * The CPU interface to the PERST# signal is platform dependent. + * Call the board-specific codes to perform this task. + */ + board_assert_perst(); + + /* Step2: PHY common lane reset */ + pcie_cfg = msg_port_alt_read(MSG_PORT_SOC_UNIT, PCIE_CFG); + pcie_cfg |= PCIE_PHY_LANE_RST; + msg_port_alt_write(MSG_PORT_SOC_UNIT, PCIE_CFG, pcie_cfg); + /* wait 1 ms for PHY common lane reset */ + mdelay(1); + + /* Step3: PHY sideband interface reset and controller main reset */ + pcie_cfg = msg_port_alt_read(MSG_PORT_SOC_UNIT, PCIE_CFG); + pcie_cfg |= (PCIE_PHY_SB_RST | PCIE_CTLR_MAIN_RST); + msg_port_alt_write(MSG_PORT_SOC_UNIT, PCIE_CFG, pcie_cfg); + /* wait 80ms for PLL to lock */ + mdelay(80); + + /* Step4: Controller sideband interface reset */ + pcie_cfg = msg_port_alt_read(MSG_PORT_SOC_UNIT, PCIE_CFG); + pcie_cfg |= PCIE_CTLR_SB_RST; + msg_port_alt_write(MSG_PORT_SOC_UNIT, PCIE_CFG, pcie_cfg); + /* wait 20ms for controller sideband interface reset */ + mdelay(20); + + /* Step5: De-assert PERST# */ + board_deassert_perst(); + + /* Step6: Controller primary interface reset */ + pcie_cfg = msg_port_alt_read(MSG_PORT_SOC_UNIT, PCIE_CFG); + pcie_cfg |= PCIE_CTLR_PRI_RST; + msg_port_alt_write(MSG_PORT_SOC_UNIT, PCIE_CFG, pcie_cfg); + + /* Mixer Load Lane 0 */ + pcie_cfg = msg_port_io_read(MSG_PORT_PCIE_AFE, PCIE_RXPICTRL0_L0); + pcie_cfg &= ~((1 << 6) | (1 << 7)); + msg_port_io_write(MSG_PORT_PCIE_AFE, PCIE_RXPICTRL0_L0, pcie_cfg); + + /* Mixer Load Lane 1 */ + pcie_cfg = msg_port_io_read(MSG_PORT_PCIE_AFE, PCIE_RXPICTRL0_L1); + pcie_cfg &= ~((1 << 6) | (1 << 7)); + msg_port_io_write(MSG_PORT_PCIE_AFE, PCIE_RXPICTRL0_L1, pcie_cfg); +} + static void quark_enable_legacy_seg(void) { u32 hmisc2; @@ -106,6 +158,17 @@ int arch_cpu_init(void) */ quark_setup_bars(); + /* + * Initialize PCIe controller + * + * Quark SoC holds the PCIe controller in reset following a power on. + * U-Boot needs to release the PCIe controller from reset. The PCIe + * controller (D23:F0/F1) will not be visible in PCI configuration + * space and any access to its PCI configuration registers will cause + * system hang while it is held in reset. + */ + quark_pcie_early_init(); + /* Turn on legacy segments (A/B/E/F) decode to system RAM */ quark_enable_legacy_seg(); diff --git a/arch/x86/include/asm/arch-quark/quark.h b/arch/x86/include/asm/arch-quark/quark.h index 1ce56934d6..aad7fbe883 100644 --- a/arch/x86/include/asm/arch-quark/quark.h +++ b/arch/x86/include/asm/arch-quark/quark.h @@ -12,6 +12,7 @@ #define MSG_PORT_HOST_BRIDGE 0x03 #define MSG_PORT_RMU 0x04 #define MSG_PORT_MEM_MGR 0x05 +#define MSG_PORT_PCIE_AFE 0x16 #define MSG_PORT_SOC_UNIT 0x31 /* Port 0x00: Memory Arbiter Message Port Registers */ @@ -48,6 +49,21 @@ #define ESRAM_BLK_CTRL 0x82 #define ESRAM_BLOCK_MODE 0x10000000 +/* Port 0x16: PCIe AFE Unit Port Registers */ + +#define PCIE_RXPICTRL0_L0 0x2080 +#define PCIE_RXPICTRL0_L1 0x2180 + +/* Port 0x31: SoC Unit Port Registers */ + +/* PCIe Controller Config */ +#define PCIE_CFG 0x36 +#define PCIE_CTLR_PRI_RST 0x00010000 +#define PCIE_PHY_SB_RST 0x00020000 +#define PCIE_CTLR_SB_RST 0x00040000 +#define PCIE_PHY_LANE_RST 0x00090000 +#define PCIE_CTLR_MAIN_RST 0x00100000 + /* DRAM */ #define DRAM_BASE 0x00000000 #define DRAM_MAX_SIZE 0x80000000 @@ -124,6 +140,32 @@ static inline void qrk_pci_write_config_dword(pci_dev_t dev, int offset, outl(value, PCI_REG_DATA); } +/** + * board_assert_perst() - Assert the PERST# pin + * + * The CPU interface to the PERST# signal on Quark is platform dependent. + * Board-specific codes need supply this routine to assert PCIe slot reset. + * + * The tricky part in this routine is that any APIs that may trigger PCI + * enumeration process are strictly forbidden, as any access to PCIe root + * port's configuration registers will cause system hang while it is held + * in reset. + */ +void board_assert_perst(void); + +/** + * board_deassert_perst() - De-assert the PERST# pin + * + * The CPU interface to the PERST# signal on Quark is platform dependent. + * Board-specific codes need supply this routine to de-assert PCIe slot reset. + * + * The tricky part in this routine is that any APIs that may trigger PCI + * enumeration process are strictly forbidden, as any access to PCIe root + * port's configuration registers will cause system hang while it is held + * in reset. + */ +void board_deassert_perst(void); + #endif /* __ASSEMBLY__ */ #endif /* _QUARK_H_ */ diff --git a/board/intel/galileo/galileo.c b/board/intel/galileo/galileo.c index 746ab277cb..c1087acb69 100644 --- a/board/intel/galileo/galileo.c +++ b/board/intel/galileo/galileo.c @@ -5,12 +5,68 @@ */ #include +#include +#include +#include +#include int board_early_init_f(void) { return 0; } +/* + * Intel Galileo gen2 board uses GPIO Resume Well bank pin0 as the PERST# pin. + * + * We cannot use any public GPIO APIs in to control this + * pin, as these APIs will eventually call into gpio_ich6_ofdata_to_platdata() + * in the Intel ICH6 GPIO driver where it calls PCI configuration space access + * APIs which will trigger PCI enumeration process. + * + * Check for more details. + */ +void board_assert_perst(void) +{ + u32 base, port, val; + + /* retrieve the GPIO IO base */ + qrk_pci_read_config_dword(QUARK_LEGACY_BRIDGE, PCI_CFG_GPIOBASE, &base); + base = (base & 0xffff) & ~0x7f; + + /* enable the pin */ + port = base + 0x20; + val = inl(port); + val |= (1 << 0); + outl(val, port); + + /* configure the pin as output */ + port = base + 0x24; + val = inl(port); + val &= ~(1 << 0); + outl(val, port); + + /* pull it down (assert) */ + port = base + 0x28; + val = inl(port); + val &= ~(1 << 0); + outl(val, port); +} + +void board_deassert_perst(void) +{ + u32 base, port, val; + + /* retrieve the GPIO IO base */ + qrk_pci_read_config_dword(QUARK_LEGACY_BRIDGE, PCI_CFG_GPIOBASE, &base); + base = (base & 0xffff) & ~0x7f; + + /* pull it up (de-assert) */ + port = base + 0x28; + val = inl(port); + val |= (1 << 0); + outl(val, port); +} + void setup_pch_gpios(u16 gpiobase, const struct pch_gpio_map *gpio) { return;