Add cpu_clock_teardown() call before the Linux kernel is started, so the CPU code can stop clock that may hinder the Linux's boot.

Signed-off-by: Marek Vasut marex@denx.de Cc: Albert Aribaud albert.u.boot@aribaud.net Cc: Stefano Babic sbabic@denx.de --- arch/arm/cpu/armv7/cpu.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/arch/arm/cpu/armv7/cpu.c b/arch/arm/cpu/armv7/cpu.c index 01cdb7e..75f8a33 100644 --- a/arch/arm/cpu/armv7/cpu.c +++ b/arch/arm/cpu/armv7/cpu.c @@ -23,6 +23,7 @@ #include <linux/compiler.h>

void __weak cpu_cache_initialization(void){} +void __weak cpu_clock_teardown(void) {}

int cleanup_before_linux(void) { @@ -66,5 +67,8 @@ int cleanup_before_linux(void) */ cpu_cache_initialization();

+ /* Let CPUs stop clock that might hinder Linux's boot. */ + cpu_clock_teardown(); + return 0; }

Split the SATA clock enabling function and add PCI express clock enabling function. The SATA clock enabling function starts up the 100MHz SATA reference PLL in ENET_PLL register, but the code can be re-used to enable the 125MHz PCIe reference in ENET_PLL, so pull this code into separate function. Moreover, add the PCIe clock enabling code.

Signed-off-by: Marek Vasut marex@denx.de Cc: Albert Aribaud albert.u.boot@aribaud.net Cc: Fabio Estevam fabio.estevam@freescale.com Cc: Stefano Babic sbabic@denx.de --- arch/arm/cpu/armv7/mx6/clock.c | 84 ++++++++++++++++++++++++++++++----- arch/arm/include/asm/arch-mx6/clock.h | 1 + 2 files changed, 75 insertions(+), 10 deletions(-)

diff --git a/arch/arm/cpu/armv7/mx6/clock.c b/arch/arm/cpu/armv7/mx6/clock.c index df11678..3101cb9 100644 --- a/arch/arm/cpu/armv7/mx6/clock.c +++ b/arch/arm/cpu/armv7/mx6/clock.c @@ -376,17 +376,12 @@ u32 imx_get_fecclk(void) return decode_pll(PLL_ENET, MXC_HCLK); }

-int enable_sata_clock(void) +static int enable_enet_pll(uint32_t en) { - u32 reg = 0; - s32 timeout = 100000; struct mxc_ccm_reg *const imx_ccm = (struct mxc_ccm_reg *) CCM_BASE_ADDR; - - /* Enable sata clock */ - reg = readl(&imx_ccm->CCGR5); /* CCGR5 */ - reg |= MXC_CCM_CCGR5_SATA_MASK; - writel(reg, &imx_ccm->CCGR5); + s32 timeout = 100000; + u32 reg = 0;

/* Enable PLLs */ reg = readl(&imx_ccm->analog_pll_enet); @@ -401,10 +396,79 @@ int enable_sata_clock(void) return -EIO; reg &= ~BM_ANADIG_PLL_SYS_BYPASS; writel(reg, &imx_ccm->analog_pll_enet); - reg |= BM_ANADIG_PLL_ENET_ENABLE_SATA; + reg |= en; writel(reg, &imx_ccm->analog_pll_enet); + return 0; +} + +static void ungate_sata_clock(void) +{ + struct mxc_ccm_reg *const imx_ccm = + (struct mxc_ccm_reg *) CCM_BASE_ADDR; + + /* Enable SATA clock. */ + setbits_le32(&imx_ccm->CCGR5, MXC_CCM_CCGR5_SATA_MASK); +} + +static void ungate_pcie_clock(void) +{ + struct mxc_ccm_reg *const imx_ccm = + (struct mxc_ccm_reg *) CCM_BASE_ADDR; + + /* Enable PCIe clock. */ + setbits_le32(&imx_ccm->CCGR4, MXC_CCM_CCGR4_PCIE_MASK); +} + +int enable_sata_clock(void) +{ + ungate_sata_clock(); + return enable_enet_pll(BM_ANADIG_PLL_ENET_ENABLE_SATA); +} + +int enable_pcie_clock(void) +{ + struct anatop_regs *anatop_regs = + (struct anatop_regs *)ANATOP_BASE_ADDR; + struct mxc_ccm_reg *ccm_regs = (struct mxc_ccm_reg *)CCM_BASE_ADDR; + + /* + * Here be dragons! + * + * The register ANATOP_MISC1 is not documented in the Freescale + * MX6RM. The register that is mapped in the ANATOP space and + * marked as ANATOP_MISC1 is actually documented in the PMU section + * of the datasheet as PMU_MISC1. + * + * Switch LVDS clock source to SATA (0xb), disable clock INPUT and + * enable clock OUTPUT. This is important for PCI express link that + * is clocked from the i.MX6. + */ +#define ANADIG_ANA_MISC1_LVDSCLK1_IBEN (1 << 12) +#define ANADIG_ANA_MISC1_LVDSCLK1_OBEN (1 << 10) +#define ANADIG_ANA_MISC1_LVDS1_CLK_SEL_MASK 0x0000001F + clrsetbits_le32(&anatop_regs->ana_misc1, + ANADIG_ANA_MISC1_LVDSCLK1_IBEN | + ANADIG_ANA_MISC1_LVDS1_CLK_SEL_MASK, + ANADIG_ANA_MISC1_LVDSCLK1_OBEN | 0xb); + + /* PCIe reference clock sourced from AXI. */ + clrbits_le32(&ccm_regs->cbcmr, MXC_CCM_CBCMR_PCIE_AXI_CLK_SEL); + + /* Party time! Ungate the clock to the PCIe. */ + ungate_sata_clock(); + ungate_pcie_clock(); + + return enable_enet_pll(BM_ANADIG_PLL_ENET_ENABLE_SATA | + BM_ANADIG_PLL_ENET_ENABLE_PCIE); +} + +void cpu_clock_teardown(void) +{ + struct anatop_regs *anatop_regs = + (struct anatop_regs *)ANATOP_BASE_ADDR;

- return 0 ; + /* Stop the PCIe/LVDS clock source before booting Linux. */ + writel(0, &anatop_regs->ana_misc1); }

unsigned int mxc_get_clock(enum mxc_clock clk) diff --git a/arch/arm/include/asm/arch-mx6/clock.h b/arch/arm/include/asm/arch-mx6/clock.h index 93f29a7..95b1270 100644 --- a/arch/arm/include/asm/arch-mx6/clock.h +++ b/arch/arm/include/asm/arch-mx6/clock.h @@ -48,6 +48,7 @@ unsigned int mxc_get_clock(enum mxc_clock clk); void enable_ocotp_clk(unsigned char enable); void enable_usboh3_clk(unsigned char enable); int enable_sata_clock(void); +int enable_pcie_clock(void); int enable_i2c_clk(unsigned char enable, unsigned i2c_num); void enable_ipu_clock(void); int enable_fec_anatop_clock(void);

Add PCIe driver for the Freescale i.MX6 SoC . This driver operates the PCIe block in RC mode only, the EP mode is NOT supported. The driver is tested with the Intel e1000 NIC driver.

Signed-off-by: Marek Vasut marex@denx.de Cc: Albert Aribaud albert.u.boot@aribaud.net Cc: Fabio Estevam fabio.estevam@freescale.com Cc: Stefano Babic sbabic@denx.de --- arch/arm/include/asm/arch-mx6/iomux.h | 30 ++ drivers/pci/Makefile | 1 + drivers/pci/pcie_imx.c | 560 ++++++++++++++++++++++++++++++++++ 3 files changed, 591 insertions(+) create mode 100644 drivers/pci/pcie_imx.c

diff --git a/arch/arm/include/asm/arch-mx6/iomux.h b/arch/arm/include/asm/arch-mx6/iomux.h index ff13a1e..bf727a9 100644 --- a/arch/arm/include/asm/arch-mx6/iomux.h +++ b/arch/arm/include/asm/arch-mx6/iomux.h @@ -10,6 +10,36 @@ #define MX6_IOMUXC_GPR7 0x020e001c

/* + * IOMUXC_GPR1 bit fields + */ +#define IOMUXC_GPR1_REF_SSP_EN (1 << 16) +#define IOMUXC_GPR1_TEST_POWERDOWN (1 << 18) + +/* + * IOMUXC_GPR8 bit fields + */ +#define IOMUXC_GPR8_PCS_TX_DEEMPH_GEN1_MASK (0x3f << 0) +#define IOMUXC_GPR8_PCS_TX_DEEMPH_GEN1_OFFSET 0 +#define IOMUXC_GPR8_PCS_TX_DEEMPH_GEN2_3P5DB_MASK (0x3f << 6) +#define IOMUXC_GPR8_PCS_TX_DEEMPH_GEN2_3P5DB_OFFSET 6 +#define IOMUXC_GPR8_PCS_TX_DEEMPH_GEN2_6DB_MASK (0x3f << 12) +#define IOMUXC_GPR8_PCS_TX_DEEMPH_GEN2_6DB_OFFSET 12 +#define IOMUXC_GPR8_PCS_TX_SWING_FULL_MASK (0x7f << 18) +#define IOMUXC_GPR8_PCS_TX_SWING_FULL_OFFSET 18 +#define IOMUXC_GPR8_PCS_TX_SWING_LOW_MASK (0x7f << 25) +#define IOMUXC_GPR8_PCS_TX_SWING_LOW_OFFSET 25 + +/* + * IOMUXC_GPR12 bit fields + */ +#define IOMUXC_GPR12_LOS_LEVEL_9 (0x9 << 4) +#define IOMUXC_GPR12_LOS_LEVEL_MASK (0x1f << 4) +#define IOMUXC_GPR12_APPS_LTSSM_ENABLE (1 << 10) +#define IOMUXC_GPR12_DEVICE_TYPE_EP (0x0 << 12) +#define IOMUXC_GPR12_DEVICE_TYPE_RC (0x2 << 12) +#define IOMUXC_GPR12_DEVICE_TYPE_MASK (0xf << 12) + +/* * IOMUXC_GPR13 bit fields */ #define IOMUXC_GPR13_SDMA_STOP_REQ (1<<30) diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile index be26b60..46c5c9a 100644 --- a/drivers/pci/Makefile +++ b/drivers/pci/Makefile @@ -13,6 +13,7 @@ COBJS-$(CONFIG_FSL_PCI_INIT) += fsl_pci_init.o COBJS-$(CONFIG_PCI) += pci.o pci_auto.o COBJS-$(CONFIG_PCI_INDIRECT_BRIDGE) += pci_indirect.o COBJS-$(CONFIG_PCI_GT64120) += pci_gt64120.o +COBJS-$(CONFIG_PCIE_IMX) += pcie_imx.o COBJS-$(CONFIG_FTPCI100) += pci_ftpci100.o COBJS-$(CONFIG_IXP_PCI) += pci_ixp.o COBJS-$(CONFIG_SH4_PCI) += pci_sh4.o diff --git a/drivers/pci/pcie_imx.c b/drivers/pci/pcie_imx.c new file mode 100644 index 0000000..12e3546 --- /dev/null +++ b/drivers/pci/pcie_imx.c @@ -0,0 +1,560 @@ +/* + * Freescale i.MX6 PCI Express Root-Complex driver + * + * Copyright (C) 2013 Marek Vasut marex@denx.de + * + * Based on upstream Linux kernel driver: + * pci-imx6.c: Sean Cross xobs@kosagi.com + * pcie-designware.c: Jingoo Han jg1.han@samsung.com + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <common.h> +#include <pci.h> +#include <asm/arch/clock.h> +#include <asm/arch/iomux.h> +#include <asm/arch/crm_regs.h> +#include <asm/io.h> +#include <asm/sizes.h> +#include <errno.h> + +#define PCI_ACCESS_READ 0 +#define PCI_ACCESS_WRITE 1 + +#define MX6_DBI_ADDR 0x01ffc000 +#define MX6_DBI_SIZE 0x4000 +#define MX6_IO_ADDR 0x01000000 +#define MX6_IO_SIZE 0x100000 +#define MX6_MEM_ADDR 0x01100000 +#define MX6_MEM_SIZE 0xe00000 +#define MX6_ROOT_ADDR 0x01f00000 +#define MX6_ROOT_SIZE 0xfc000 + +/* PCIe Port Logic registers (memory-mapped) */ +#define PL_OFFSET 0x700 +#define PCIE_PHY_DEBUG_R0 (PL_OFFSET + 0x28) +#define PCIE_PHY_DEBUG_R1 (PL_OFFSET + 0x2c) + +#define PCIE_PHY_CTRL (PL_OFFSET + 0x114) +#define PCIE_PHY_CTRL_DATA_LOC 0 +#define PCIE_PHY_CTRL_CAP_ADR_LOC 16 +#define PCIE_PHY_CTRL_CAP_DAT_LOC 17 +#define PCIE_PHY_CTRL_WR_LOC 18 +#define PCIE_PHY_CTRL_RD_LOC 19 + +#define PCIE_PHY_STAT (PL_OFFSET + 0x110) +#define PCIE_PHY_STAT_DATA_LOC 0 +#define PCIE_PHY_STAT_ACK_LOC 16 + +/* PHY registers (not memory-mapped) */ +#define PCIE_PHY_RX_ASIC_OUT 0x100D + +#define PHY_RX_OVRD_IN_LO 0x1005 +#define PHY_RX_OVRD_IN_LO_RX_DATA_EN (1 << 5) +#define PHY_RX_OVRD_IN_LO_RX_PLL_EN (1 << 3) + +/* iATU registers */ +#define PCIE_ATU_VIEWPORT 0x900 +#define PCIE_ATU_REGION_INBOUND (0x1 << 31) +#define PCIE_ATU_REGION_OUTBOUND (0x0 << 31) +#define PCIE_ATU_REGION_INDEX1 (0x1 << 0) +#define PCIE_ATU_REGION_INDEX0 (0x0 << 0) +#define PCIE_ATU_CR1 0x904 +#define PCIE_ATU_TYPE_MEM (0x0 << 0) +#define PCIE_ATU_TYPE_IO (0x2 << 0) +#define PCIE_ATU_TYPE_CFG0 (0x4 << 0) +#define PCIE_ATU_TYPE_CFG1 (0x5 << 0) +#define PCIE_ATU_CR2 0x908 +#define PCIE_ATU_ENABLE (0x1 << 31) +#define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30) +#define PCIE_ATU_LOWER_BASE 0x90C +#define PCIE_ATU_UPPER_BASE 0x910 +#define PCIE_ATU_LIMIT 0x914 +#define PCIE_ATU_LOWER_TARGET 0x918 +#define PCIE_ATU_BUS(x) (((x) & 0xff) << 24) +#define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19) +#define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16) +#define PCIE_ATU_UPPER_TARGET 0x91C + +/* + * PHY access functions + */ +static int pcie_phy_poll_ack(void __iomem *dbi_base, int exp_val) +{ + u32 val; + u32 max_iterations = 10; + u32 wait_counter = 0; + + do { + val = readl(dbi_base + PCIE_PHY_STAT); + val = (val >> PCIE_PHY_STAT_ACK_LOC) & 0x1; + wait_counter++; + + if (val == exp_val) + return 0; + + udelay(1); + } while (wait_counter < max_iterations); + + return -ETIMEDOUT; +} + +static int pcie_phy_wait_ack(void __iomem *dbi_base, int addr) +{ + u32 val; + int ret; + + val = addr << PCIE_PHY_CTRL_DATA_LOC; + writel(val, dbi_base + PCIE_PHY_CTRL); + + val |= (0x1 << PCIE_PHY_CTRL_CAP_ADR_LOC); + writel(val, dbi_base + PCIE_PHY_CTRL); + + ret = pcie_phy_poll_ack(dbi_base, 1); + if (ret) + return ret; + + val = addr << PCIE_PHY_CTRL_DATA_LOC; + writel(val, dbi_base + PCIE_PHY_CTRL); + + ret = pcie_phy_poll_ack(dbi_base, 0); + if (ret) + return ret; + + return 0; +} + +/* Read from the 16-bit PCIe PHY control registers (not memory-mapped) */ +static int pcie_phy_read(void __iomem *dbi_base, int addr , int *data) +{ + u32 val, phy_ctl; + int ret; + + ret = pcie_phy_wait_ack(dbi_base, addr); + if (ret) + return ret; + + /* assert Read signal */ + phy_ctl = 0x1 << PCIE_PHY_CTRL_RD_LOC; + writel(phy_ctl, dbi_base + PCIE_PHY_CTRL); + + ret = pcie_phy_poll_ack(dbi_base, 1); + if (ret) + return ret; + + val = readl(dbi_base + PCIE_PHY_STAT); + *data = val & 0xffff; + + /* deassert Read signal */ + writel(0x00, dbi_base + PCIE_PHY_CTRL); + + ret = pcie_phy_poll_ack(dbi_base, 0); + if (ret) + return ret; + + return 0; +} + +static int pcie_phy_write(void __iomem *dbi_base, int addr, int data) +{ + u32 var; + int ret; + + /* write addr */ + /* cap addr */ + ret = pcie_phy_wait_ack(dbi_base, addr); + if (ret) + return ret; + + var = data << PCIE_PHY_CTRL_DATA_LOC; + writel(var, dbi_base + PCIE_PHY_CTRL); + + /* capture data */ + var |= (0x1 << PCIE_PHY_CTRL_CAP_DAT_LOC); + writel(var, dbi_base + PCIE_PHY_CTRL); + + ret = pcie_phy_poll_ack(dbi_base, 1); + if (ret) + return ret; + + /* deassert cap data */ + var = data << PCIE_PHY_CTRL_DATA_LOC; + writel(var, dbi_base + PCIE_PHY_CTRL); + + /* wait for ack de-assertion */ + ret = pcie_phy_poll_ack(dbi_base, 0); + if (ret) + return ret; + + /* assert wr signal */ + var = 0x1 << PCIE_PHY_CTRL_WR_LOC; + writel(var, dbi_base + PCIE_PHY_CTRL); + + /* wait for ack */ + ret = pcie_phy_poll_ack(dbi_base, 1); + if (ret) + return ret; + + /* deassert wr signal */ + var = data << PCIE_PHY_CTRL_DATA_LOC; + writel(var, dbi_base + PCIE_PHY_CTRL); + + /* wait for ack de-assertion */ + ret = pcie_phy_poll_ack(dbi_base, 0); + if (ret) + return ret; + + writel(0x0, dbi_base + PCIE_PHY_CTRL); + + return 0; +} + +static int imx6_pcie_link_up(void) +{ + u32 rc, ltssm; + int rx_valid, temp; + + /* link is debug bit 36, debug register 1 starts at bit 32 */ + rc = readl(MX6_DBI_ADDR + PCIE_PHY_DEBUG_R1) & (0x1 << (36 - 32)); + if (rc) + return -EAGAIN; + + /* + * From L0, initiate MAC entry to gen2 if EP/RC supports gen2. + * Wait 2ms (LTSSM timeout is 24ms, PHY lock is ~5us in gen2). + * If (MAC/LTSSM.state == Recovery.RcvrLock) + * && (PHY/rx_valid==0) then pulse PHY/rx_reset. Transition + * to gen2 is stuck + */ + pcie_phy_read((void *)MX6_DBI_ADDR, PCIE_PHY_RX_ASIC_OUT, &rx_valid); + ltssm = readl(MX6_DBI_ADDR + PCIE_PHY_DEBUG_R0) & 0x3F; + + if (rx_valid & 0x01) + return 0; + + if (ltssm != 0x0d) + return 0; + + printf("transition to gen2 is stuck, reset PHY!\n"); + + pcie_phy_read((void *)MX6_DBI_ADDR, PHY_RX_OVRD_IN_LO, &temp); + temp |= (PHY_RX_OVRD_IN_LO_RX_DATA_EN | PHY_RX_OVRD_IN_LO_RX_PLL_EN); + pcie_phy_write((void *)MX6_DBI_ADDR, PHY_RX_OVRD_IN_LO, temp); + + udelay(3000); + + pcie_phy_read((void *)MX6_DBI_ADDR, PHY_RX_OVRD_IN_LO, &temp); + temp &= ~(PHY_RX_OVRD_IN_LO_RX_DATA_EN | PHY_RX_OVRD_IN_LO_RX_PLL_EN); + pcie_phy_write((void *)MX6_DBI_ADDR, PHY_RX_OVRD_IN_LO, temp); + + return 0; +} + +/* + * iATU region setup + */ +static int imx_pcie_regions_setup(void) +{ + /* + * i.MX6 defines 16MB in the AXI address map for PCIe. + * + * That address space excepted the pcie registers is + * split and defined into different regions by iATU, + * with sizes and offsets as follows: + * + * 0x0100_0000 --- 0x010F_FFFF 1MB IORESOURCE_IO + * 0x0110_0000 --- 0x01EF_FFFF 14MB IORESOURCE_MEM + * 0x01F0_0000 --- 0x01FF_FFFF 1MB Cfg + Registers + */ + + /* CMD reg:I/O space, MEM space, and Bus Master Enable */ + setbits_le32(MX6_DBI_ADDR | PCI_COMMAND, + PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); + + /* Set the CLASS_REV of RC CFG header to PCI_CLASS_BRIDGE_PCI */ + setbits_le32(MX6_DBI_ADDR + PCI_CLASS_REVISION, + PCI_CLASS_BRIDGE_PCI << 16); + + /* Region #0 is used for Outbound CFG space access. */ + writel(0, MX6_DBI_ADDR + PCIE_ATU_VIEWPORT); + + writel(MX6_ROOT_ADDR, MX6_DBI_ADDR + PCIE_ATU_LOWER_BASE); + writel(0, MX6_DBI_ADDR + PCIE_ATU_UPPER_BASE); + writel(MX6_ROOT_ADDR + MX6_ROOT_SIZE, MX6_DBI_ADDR + PCIE_ATU_LIMIT); + + writel(0, MX6_DBI_ADDR + PCIE_ATU_LOWER_TARGET); + writel(0, MX6_DBI_ADDR + PCIE_ATU_UPPER_TARGET); + writel(PCIE_ATU_TYPE_CFG0, MX6_DBI_ADDR + PCIE_ATU_CR1); + writel(PCIE_ATU_ENABLE, MX6_DBI_ADDR + PCIE_ATU_CR2); + + return 0; +} + +/* + * PCI Express accessors + */ +static uint32_t get_bus_address(pci_dev_t d, int where) +{ + uint32_t va_address; + + /* Reconfigure Region #0 */ + writel(0, MX6_DBI_ADDR + PCIE_ATU_VIEWPORT); + + if (PCI_BUS(d) < 2) + writel(PCIE_ATU_TYPE_CFG0, MX6_DBI_ADDR + PCIE_ATU_CR1); + else + writel(PCIE_ATU_TYPE_CFG1, MX6_DBI_ADDR + PCIE_ATU_CR1); + + if (PCI_BUS(d) == 0) { + va_address = MX6_DBI_ADDR; + } else { + writel(d << 8, MX6_DBI_ADDR + PCIE_ATU_LOWER_TARGET); + va_address = MX6_IO_ADDR + SZ_16M - SZ_1M; + } + + va_address += (where & ~0x3); + + return va_address; +} + +static int imx_pcie_addr_valid(pci_dev_t d) +{ + if ((PCI_BUS(d) == 0) && (PCI_DEV(d) > 1)) + return -EINVAL; + if ((PCI_BUS(d) == 1) && (PCI_DEV(d) > 0)) + return -EINVAL; + return 0; +} + +/* + * Replace the original ARM DABT handler with a simple jump-back one. + * + * The problem here is that if we have a PCIe bridge attached to this PCIe + * controller, but no PCIe device is connected to the bridges' downstream + * port, the attempt to read/write from/to the config space will produce + * a DABT. This is a behavior of the controller and can not be disabled + * unfortuatelly. + * + * To work around the problem, we backup the current DABT handler address + * and replace it with our own DABT handler, which only bounces right back + * into the code. + */ +static void imx_pcie_fix_dabt_handler(bool set) +{ + extern uint32_t *_data_abort; + uint32_t *data_abort_addr = (uint32_t *)&_data_abort; + + static const uint32_t data_abort_bounce_handler = 0xe25ef004; + uint32_t data_abort_bounce_addr = (uint32_t)&data_abort_bounce_handler; + + static uint32_t data_abort_backup; + + if (set) { + data_abort_backup = *data_abort_addr; + *data_abort_addr = data_abort_bounce_addr; + } else { + *data_abort_addr = data_abort_backup; + } +} + +static int imx_pcie_read_config(struct pci_controller *hose, pci_dev_t d, + int where, u32 *val) +{ + uint32_t va_address; + int ret; + + ret = imx_pcie_addr_valid(d); + if (ret) { + *val = 0xffffffff; + return ret; + } + + va_address = get_bus_address(d, where); + + /* + * Read the PCIe config space. We must replace the DABT handler + * here in case we got data abort from the PCIe controller, see + * imx_pcie_fix_dabt_handler() description. Note that writing the + * "val" with valid value is also imperative here as in case we + * did got DABT, the val would contain random value. + */ + imx_pcie_fix_dabt_handler(true); + writel(0xffffffff, val); + *val = readl(va_address); + imx_pcie_fix_dabt_handler(false); + + return 0; +} + +static int imx_pcie_write_config(struct pci_controller *hose, pci_dev_t d, + int where, u32 val) +{ + uint32_t va_address = 0; + int ret; + + ret = imx_pcie_addr_valid(d); + if (ret) + return ret; + + va_address = get_bus_address(d, where); + + /* + * Write the PCIe config space. We must replace the DABT handler + * here in case we got data abort from the PCIe controller, see + * imx_pcie_fix_dabt_handler() description. + */ + imx_pcie_fix_dabt_handler(true); + writel(val, va_address); + imx_pcie_fix_dabt_handler(false); + + return 0; +} + +/* + * Initial bus setup + */ +static int imx6_pcie_assert_core_reset(void) +{ + struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR; + + setbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_TEST_POWERDOWN); + setbits_le32(&iomuxc_regs->gpr[12], IOMUXC_GPR12_APPS_LTSSM_ENABLE); + clrbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_REF_SSP_EN); + + /* FIXME: GPIO reset goes here */ + mdelay(100); + + return 0; +} + +static int imx6_pcie_init_phy(void) +{ + struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR; + + clrbits_le32(&iomuxc_regs->gpr[12], IOMUXC_GPR12_APPS_LTSSM_ENABLE); + + clrsetbits_le32(&iomuxc_regs->gpr[12], + IOMUXC_GPR12_DEVICE_TYPE_MASK, + IOMUXC_GPR12_DEVICE_TYPE_RC); + clrsetbits_le32(&iomuxc_regs->gpr[12], + IOMUXC_GPR12_LOS_LEVEL_MASK, + IOMUXC_GPR12_LOS_LEVEL_9); + + writel((0x0 << IOMUXC_GPR8_PCS_TX_DEEMPH_GEN1_OFFSET) | + (0x0 << IOMUXC_GPR8_PCS_TX_DEEMPH_GEN2_3P5DB_OFFSET) | + (20 << IOMUXC_GPR8_PCS_TX_DEEMPH_GEN2_6DB_OFFSET) | + (127 << IOMUXC_GPR8_PCS_TX_SWING_FULL_OFFSET) | + (127 << IOMUXC_GPR8_PCS_TX_SWING_LOW_OFFSET), + &iomuxc_regs->gpr[8]); + + return 0; +} + +static int imx6_pcie_deassert_core_reset(void) +{ + struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR; + + /* FIXME: Power-up GPIO goes here. */ + + /* Enable PCIe */ + clrbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_TEST_POWERDOWN); + setbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_REF_SSP_EN); + + enable_pcie_clock(); + + /* + * Wait for the clock to settle a bit, when the clock are sourced + * from the CPU, we need about 30mS to settle. + */ + udelay(30000); + + return 0; +} + +static int imx_pcie_link_up(void) +{ + struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR; + uint32_t tmp; + int count = 0; + + imx6_pcie_assert_core_reset(); + imx6_pcie_init_phy(); + imx6_pcie_deassert_core_reset(); + + imx_pcie_regions_setup(); + + /* + * FIXME: Force the PCIe RC to Gen1 operation + * The RC must be forced into Gen1 mode before bringing the link + * up, otherwise no downstream devices are detected. After the + * link is up, a managed Gen1->Gen2 transition can be initiated. + */ + tmp = readl(MX6_DBI_ADDR + 0x7c); + tmp &= ~0xf; + tmp |= 0x1; + writel(tmp, MX6_DBI_ADDR + 0x7c); + + /* LTSSM enable, starting link. */ + setbits_le32(&iomuxc_regs->gpr[12], IOMUXC_GPR12_APPS_LTSSM_ENABLE); + + while (!imx6_pcie_link_up()) { + udelay(1000); + count++; + if (count >= 2000) { + debug("phy link never came up\n"); + debug("DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n", + readl(MX6_DBI_ADDR + PCIE_PHY_DEBUG_R0), + readl(MX6_DBI_ADDR + PCIE_PHY_DEBUG_R1)); + break; + } + } + + return 0; +} + +void imx_pcie_init(void) +{ + /* Static instance of the controller. */ + static struct pci_controller pcc; + struct pci_controller *hose = &pcc; + + memset(&pcc, 0, sizeof(pcc)); + + /* PCI I/O space */ + pci_set_region(&hose->regions[0], + MX6_IO_ADDR, MX6_IO_ADDR, + MX6_IO_SIZE, PCI_REGION_IO); + + /* PCI memory space */ + pci_set_region(&hose->regions[1], + MX6_MEM_ADDR, MX6_MEM_ADDR, + MX6_MEM_SIZE, PCI_REGION_MEM); + + /* System memory space */ + pci_set_region(&hose->regions[2], + MMDC0_ARB_BASE_ADDR, MMDC0_ARB_BASE_ADDR, + 0xefffffff, PCI_REGION_MEM | PCI_REGION_SYS_MEMORY); + + hose->region_count = 3; + + pci_set_ops(hose, + pci_hose_read_config_byte_via_dword, + pci_hose_read_config_word_via_dword, + imx_pcie_read_config, + pci_hose_write_config_byte_via_dword, + pci_hose_write_config_word_via_dword, + imx_pcie_write_config); + + /* Start the controller. */ + imx_pcie_link_up(); + + pci_register_hose(hose); + hose->last_busno = pci_hose_scan(hose); +} + +/* Probe function. */ +void pci_init_board(void) +{ + imx_pcie_init(); +}

Enable PCI express on MX6 Sabrelite.

Signed-off-by: Marek Vasut marex@denx.de Cc: Albert Aribaud albert.u.boot@aribaud.net Cc: Eric Nelson eric.nelson@boundarydevices.com Cc: Fabio Estevam fabio.estevam@freescale.com Cc: Stefano Babic sbabic@denx.de --- board/boundary/nitrogen6x/nitrogen6x.c | 7 ++++++- include/configs/nitrogen6x.h | 11 +++++++++++ 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/board/boundary/nitrogen6x/nitrogen6x.c b/board/boundary/nitrogen6x/nitrogen6x.c index 1712908..46be51e 100644 --- a/board/boundary/nitrogen6x/nitrogen6x.c +++ b/board/boundary/nitrogen6x/nitrogen6x.c @@ -369,7 +369,12 @@ int board_eth_init(bd_t *bis) free(bus); } #endif - return 0; + +#ifdef CONFIG_PCI + ret = pci_eth_init(bis); +#endif + + return ret; }

static void setup_buttons(void) diff --git a/include/configs/nitrogen6x.h b/include/configs/nitrogen6x.h index 3454b86..ccde896 100644 --- a/include/configs/nitrogen6x.h +++ b/include/configs/nitrogen6x.h @@ -355,4 +355,15 @@ #define CONFIG_SUPPORT_RAW_INITRD #define CONFIG_CMD_FS_GENERIC

+/* + * PCI express + */ +#define CONFIG_CMD_PCI +#ifdef CONFIG_CMD_PCI +#define CONFIG_PCI +#define CONFIG_PCI_PNP +#define CONFIG_PCI_SCAN_SHOW +#define CONFIG_PCIE_IMX +#endif + #endif /* __CONFIG_H */