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689 lines
19 KiB
C
689 lines
19 KiB
C
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/*
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* ***************************************************************************
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* Copyright (C) 2015 Marvell International Ltd.
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* ***************************************************************************
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation, either version 2 of the License, or any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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* ***************************************************************************
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*/
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/* pcie_advk.c
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*
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* Ported from Linux driver - driver/pci/host/pci-aardvark.c
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*
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* Author: Victor Gu <xigu@marvell.com>
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* Hezi Shahmoon <hezi.shahmoon@marvell.com>
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*
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*/
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#include <common.h>
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#include <dm.h>
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#include <pci.h>
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#include <asm/io.h>
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#include <asm-generic/gpio.h>
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#include <linux/ioport.h>
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/* PCIe core registers */
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#define PCIE_CORE_CMD_STATUS_REG 0x4
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#define PCIE_CORE_CMD_IO_ACCESS_EN BIT(0)
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#define PCIE_CORE_CMD_MEM_ACCESS_EN BIT(1)
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#define PCIE_CORE_CMD_MEM_IO_REQ_EN BIT(2)
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#define PCIE_CORE_DEV_CTRL_STATS_REG 0xc8
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#define PCIE_CORE_DEV_CTRL_STATS_RELAX_ORDER_DISABLE (0 << 4)
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#define PCIE_CORE_DEV_CTRL_STATS_SNOOP_DISABLE (0 << 11)
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#define PCIE_CORE_LINK_CTRL_STAT_REG 0xd0
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#define PCIE_CORE_LINK_TRAINING BIT(5)
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#define PCIE_CORE_ERR_CAPCTL_REG 0x118
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#define PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX BIT(5)
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#define PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX_EN BIT(6)
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#define PCIE_CORE_ERR_CAPCTL_ECRC_CHECK BIT(7)
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#define PCIE_CORE_ERR_CAPCTL_ECRC_CHECK_RCV BIT(8)
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/* PIO registers base address and register offsets */
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#define PIO_BASE_ADDR 0x4000
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#define PIO_CTRL (PIO_BASE_ADDR + 0x0)
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#define PIO_CTRL_TYPE_MASK GENMASK(3, 0)
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#define PIO_CTRL_ADDR_WIN_DISABLE BIT(24)
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#define PIO_STAT (PIO_BASE_ADDR + 0x4)
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#define PIO_COMPLETION_STATUS_SHIFT 7
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#define PIO_COMPLETION_STATUS_MASK GENMASK(9, 7)
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#define PIO_COMPLETION_STATUS_OK 0
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#define PIO_COMPLETION_STATUS_UR 1
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#define PIO_COMPLETION_STATUS_CRS 2
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#define PIO_COMPLETION_STATUS_CA 4
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#define PIO_NON_POSTED_REQ BIT(10)
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#define PIO_ERR_STATUS BIT(11)
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#define PIO_ADDR_LS (PIO_BASE_ADDR + 0x8)
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#define PIO_ADDR_MS (PIO_BASE_ADDR + 0xc)
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#define PIO_WR_DATA (PIO_BASE_ADDR + 0x10)
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#define PIO_WR_DATA_STRB (PIO_BASE_ADDR + 0x14)
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#define PIO_RD_DATA (PIO_BASE_ADDR + 0x18)
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#define PIO_START (PIO_BASE_ADDR + 0x1c)
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#define PIO_ISR (PIO_BASE_ADDR + 0x20)
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/* Aardvark Control registers */
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#define CONTROL_BASE_ADDR 0x4800
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#define PCIE_CORE_CTRL0_REG (CONTROL_BASE_ADDR + 0x0)
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#define PCIE_GEN_SEL_MSK 0x3
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#define PCIE_GEN_SEL_SHIFT 0x0
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#define SPEED_GEN_1 0
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#define SPEED_GEN_2 1
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#define SPEED_GEN_3 2
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#define IS_RC_MSK 1
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#define IS_RC_SHIFT 2
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#define LANE_CNT_MSK 0x18
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#define LANE_CNT_SHIFT 0x3
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#define LANE_COUNT_1 (0 << LANE_CNT_SHIFT)
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#define LANE_COUNT_2 (1 << LANE_CNT_SHIFT)
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#define LANE_COUNT_4 (2 << LANE_CNT_SHIFT)
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#define LANE_COUNT_8 (3 << LANE_CNT_SHIFT)
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#define LINK_TRAINING_EN BIT(6)
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#define PCIE_CORE_CTRL2_REG (CONTROL_BASE_ADDR + 0x8)
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#define PCIE_CORE_CTRL2_RESERVED 0x7
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#define PCIE_CORE_CTRL2_TD_ENABLE BIT(4)
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#define PCIE_CORE_CTRL2_STRICT_ORDER_ENABLE BIT(5)
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#define PCIE_CORE_CTRL2_ADDRWIN_MAP_ENABLE BIT(6)
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/* LMI registers base address and register offsets */
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#define LMI_BASE_ADDR 0x6000
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#define CFG_REG (LMI_BASE_ADDR + 0x0)
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#define LTSSM_SHIFT 24
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#define LTSSM_MASK 0x3f
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#define LTSSM_L0 0x10
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/* PCIe core controller registers */
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#define CTRL_CORE_BASE_ADDR 0x18000
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#define CTRL_CONFIG_REG (CTRL_CORE_BASE_ADDR + 0x0)
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#define CTRL_MODE_SHIFT 0x0
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#define CTRL_MODE_MASK 0x1
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#define PCIE_CORE_MODE_DIRECT 0x0
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#define PCIE_CORE_MODE_COMMAND 0x1
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/* Transaction types */
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#define PCIE_CONFIG_RD_TYPE0 0x8
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#define PCIE_CONFIG_RD_TYPE1 0x9
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#define PCIE_CONFIG_WR_TYPE0 0xa
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#define PCIE_CONFIG_WR_TYPE1 0xb
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/* PCI_BDF shifts 8bit, so we need extra 4bit shift */
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#define PCIE_BDF(dev) (dev << 4)
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#define PCIE_CONF_BUS(bus) (((bus) & 0xff) << 20)
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#define PCIE_CONF_DEV(dev) (((dev) & 0x1f) << 15)
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#define PCIE_CONF_FUNC(fun) (((fun) & 0x7) << 12)
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#define PCIE_CONF_REG(reg) ((reg) & 0xffc)
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#define PCIE_CONF_ADDR(bus, devfn, where) \
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(PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \
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PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where))
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/* PCIe Retries & Timeout definitions */
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#define MAX_RETRIES 10
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#define PIO_WAIT_TIMEOUT 100
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#define LINK_WAIT_TIMEOUT 100000
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#define CFG_RD_UR_VAL 0xFFFFFFFF
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#define CFG_RD_CRS_VAL 0xFFFF0001
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/**
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* struct pcie_advk - Advk PCIe controller state
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*
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* @reg_base: The base address of the register space.
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* @first_busno: This driver supports multiple PCIe controllers.
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* first_busno stores the bus number of the PCIe root-port
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* number which may vary depending on the PCIe setup
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* (PEX switches etc).
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* @device: The pointer to PCI uclass device.
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*/
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struct pcie_advk {
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void *base;
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int first_busno;
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struct udevice *dev;
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};
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static inline void advk_writel(struct pcie_advk *pcie, uint val, uint reg)
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{
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writel(val, pcie->base + reg);
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}
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static inline uint advk_readl(struct pcie_advk *pcie, uint reg)
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{
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return readl(pcie->base + reg);
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}
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/**
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* pcie_advk_addr_valid() - Check for valid bus address
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*
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* @bdf: The PCI device to access
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* @first_busno: Bus number of the PCIe controller root complex
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*
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* Return: 1 on valid, 0 on invalid
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*/
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static int pcie_advk_addr_valid(pci_dev_t bdf, int first_busno)
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{
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/*
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* In PCIE-E only a single device (0) can exist
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* on the local bus. Beyound the local bus, there might be
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* a Switch and everything is possible.
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*/
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if ((PCI_BUS(bdf) == first_busno) && (PCI_DEV(bdf) > 0))
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return 0;
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return 1;
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}
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/**
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* pcie_advk_wait_pio() - Wait for PIO access to be accomplished
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*
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* @pcie: The PCI device to access
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*
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* Wait up to 1 micro second for PIO access to be accomplished.
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*
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* Return 1 (true) if PIO access is accomplished.
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* Return 0 (false) if PIO access is timed out.
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*/
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static int pcie_advk_wait_pio(struct pcie_advk *pcie)
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{
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uint start, isr;
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uint count;
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for (count = 0; count < MAX_RETRIES; count++) {
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start = advk_readl(pcie, PIO_START);
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isr = advk_readl(pcie, PIO_ISR);
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if (!start && isr)
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return 1;
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/*
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* Do not check the PIO state too frequently,
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* 100us delay is appropriate.
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*/
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udelay(PIO_WAIT_TIMEOUT);
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}
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dev_err(pcie->dev, "config read/write timed out\n");
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return 0;
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}
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/**
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* pcie_advk_check_pio_status() - Validate PIO status and get the read result
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*
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* @pcie: Pointer to the PCI bus
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* @read: Read from or write to configuration space - true(read) false(write)
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* @read_val: Pointer to the read result, only valid when read is true
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*
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*/
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static int pcie_advk_check_pio_status(struct pcie_advk *pcie,
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bool read,
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uint *read_val)
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{
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uint reg;
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unsigned int status;
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char *strcomp_status, *str_posted;
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reg = advk_readl(pcie, PIO_STAT);
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status = (reg & PIO_COMPLETION_STATUS_MASK) >>
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PIO_COMPLETION_STATUS_SHIFT;
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switch (status) {
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case PIO_COMPLETION_STATUS_OK:
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if (reg & PIO_ERR_STATUS) {
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strcomp_status = "COMP_ERR";
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break;
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}
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/* Get the read result */
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if (read)
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*read_val = advk_readl(pcie, PIO_RD_DATA);
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/* No error */
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strcomp_status = NULL;
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break;
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case PIO_COMPLETION_STATUS_UR:
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if (read) {
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/* For reading, UR is not an error status. */
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*read_val = CFG_RD_UR_VAL;
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strcomp_status = NULL;
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} else {
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strcomp_status = "UR";
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}
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break;
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case PIO_COMPLETION_STATUS_CRS:
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if (read) {
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/* For reading, CRS is not an error status. */
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*read_val = CFG_RD_CRS_VAL;
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strcomp_status = NULL;
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} else {
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strcomp_status = "CRS";
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}
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break;
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case PIO_COMPLETION_STATUS_CA:
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strcomp_status = "CA";
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break;
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default:
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strcomp_status = "Unknown";
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break;
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}
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if (!strcomp_status)
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return 0;
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if (reg & PIO_NON_POSTED_REQ)
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str_posted = "Non-posted";
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else
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str_posted = "Posted";
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dev_err(pcie->dev, "%s PIO Response Status: %s, %#x @ %#x\n",
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str_posted, strcomp_status, reg,
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advk_readl(pcie, PIO_ADDR_LS));
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return -EFAULT;
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}
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/**
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* pcie_advk_read_config() - Read from configuration space
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*
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* @bus: Pointer to the PCI bus
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* @bdf: Identifies the PCIe device to access
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* @offset: The offset into the device's configuration space
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* @valuep: A pointer at which to store the read value
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* @size: Indicates the size of access to perform
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*
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* Read a value of size @size from offset @offset within the configuration
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* space of the device identified by the bus, device & function numbers in @bdf
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* on the PCI bus @bus.
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*
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* Return: 0 on success
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*/
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static int pcie_advk_read_config(struct udevice *bus, pci_dev_t bdf,
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uint offset, ulong *valuep,
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enum pci_size_t size)
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{
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struct pcie_advk *pcie = dev_get_priv(bus);
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uint reg;
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int ret;
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dev_dbg(pcie->dev, "PCIE CFG read: (b,d,f)=(%2d,%2d,%2d) ",
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PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
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if (!pcie_advk_addr_valid(bdf, pcie->first_busno)) {
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dev_dbg(pcie->dev, "- out of range\n");
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*valuep = pci_get_ff(size);
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return 0;
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}
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/* Start PIO */
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advk_writel(pcie, 0, PIO_START);
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advk_writel(pcie, 1, PIO_ISR);
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/* Program the control register */
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reg = advk_readl(pcie, PIO_CTRL);
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reg &= ~PIO_CTRL_TYPE_MASK;
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if (PCI_BUS(bdf) == pcie->first_busno)
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reg |= PCIE_CONFIG_RD_TYPE0;
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else
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reg |= PCIE_CONFIG_RD_TYPE1;
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advk_writel(pcie, reg, PIO_CTRL);
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/* Program the address registers */
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reg = PCIE_BDF(bdf) | PCIE_CONF_REG(offset);
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advk_writel(pcie, reg, PIO_ADDR_LS);
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advk_writel(pcie, 0, PIO_ADDR_MS);
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/* Start the transfer */
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advk_writel(pcie, 1, PIO_START);
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if (!pcie_advk_wait_pio(pcie))
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return -EINVAL;
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/* Check PIO status and get the read result */
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ret = pcie_advk_check_pio_status(pcie, true, ®);
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if (ret)
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return ret;
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dev_dbg(pcie->dev, "(addr,size,val)=(0x%04x, %d, 0x%08x)\n",
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offset, size, reg);
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*valuep = pci_conv_32_to_size(reg, offset, size);
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return 0;
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}
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/**
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* pcie_calc_datastrobe() - Calculate data strobe
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*
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* @offset: The offset into the device's configuration space
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* @size: Indicates the size of access to perform
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*
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* Calculate data strobe according to offset and size
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*
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*/
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static uint pcie_calc_datastrobe(uint offset, enum pci_size_t size)
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{
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uint bytes, data_strobe;
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switch (size) {
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case PCI_SIZE_8:
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bytes = 1;
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break;
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case PCI_SIZE_16:
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bytes = 2;
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break;
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default:
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bytes = 4;
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}
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data_strobe = GENMASK(bytes - 1, 0) << (offset & 0x3);
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return data_strobe;
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}
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/**
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* pcie_advk_write_config() - Write to configuration space
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*
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* @bus: Pointer to the PCI bus
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* @bdf: Identifies the PCIe device to access
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* @offset: The offset into the device's configuration space
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* @value: The value to write
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* @size: Indicates the size of access to perform
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*
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* Write the value @value of size @size from offset @offset within the
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* configuration space of the device identified by the bus, device & function
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* numbers in @bdf on the PCI bus @bus.
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*
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* Return: 0 on success
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*/
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static int pcie_advk_write_config(struct udevice *bus, pci_dev_t bdf,
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uint offset, ulong value,
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enum pci_size_t size)
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{
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struct pcie_advk *pcie = dev_get_priv(bus);
|
||
|
uint reg;
|
||
|
|
||
|
dev_dbg(pcie->dev, "PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ",
|
||
|
PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
|
||
|
dev_dbg(pcie->dev, "(addr,size,val)=(0x%04x, %d, 0x%08lx)\n",
|
||
|
offset, size, value);
|
||
|
|
||
|
if (!pcie_advk_addr_valid(bdf, pcie->first_busno)) {
|
||
|
dev_dbg(pcie->dev, "- out of range\n");
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/* Start PIO */
|
||
|
advk_writel(pcie, 0, PIO_START);
|
||
|
advk_writel(pcie, 1, PIO_ISR);
|
||
|
|
||
|
/* Program the control register */
|
||
|
reg = advk_readl(pcie, PIO_CTRL);
|
||
|
reg &= ~PIO_CTRL_TYPE_MASK;
|
||
|
if (PCI_BUS(bdf) == pcie->first_busno)
|
||
|
reg |= PCIE_CONFIG_WR_TYPE0;
|
||
|
else
|
||
|
reg |= PCIE_CONFIG_WR_TYPE1;
|
||
|
advk_writel(pcie, reg, PIO_CTRL);
|
||
|
|
||
|
/* Program the address registers */
|
||
|
reg = PCIE_BDF(bdf) | PCIE_CONF_REG(offset);
|
||
|
advk_writel(pcie, reg, PIO_ADDR_LS);
|
||
|
advk_writel(pcie, 0, PIO_ADDR_MS);
|
||
|
dev_dbg(pcie->dev, "\tPIO req. - addr = 0x%08x\n", reg);
|
||
|
|
||
|
/* Program the data register */
|
||
|
reg = pci_conv_size_to_32(0, value, offset, size);
|
||
|
advk_writel(pcie, reg, PIO_WR_DATA);
|
||
|
dev_dbg(pcie->dev, "\tPIO req. - val = 0x%08x\n", reg);
|
||
|
|
||
|
/* Program the data strobe */
|
||
|
reg = pcie_calc_datastrobe(offset, size);
|
||
|
advk_writel(pcie, reg, PIO_WR_DATA_STRB);
|
||
|
dev_dbg(pcie->dev, "\tPIO req. - strb = 0x%02x\n", reg);
|
||
|
|
||
|
/* Start the transfer */
|
||
|
advk_writel(pcie, 1, PIO_START);
|
||
|
|
||
|
if (!pcie_advk_wait_pio(pcie)) {
|
||
|
dev_dbg(pcie->dev, "- wait pio timeout\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
/* Check PIO status */
|
||
|
pcie_advk_check_pio_status(pcie, false, ®);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* pcie_advk_link_up() - Check if PCIe link is up or not
|
||
|
*
|
||
|
* @pcie: The PCI device to access
|
||
|
*
|
||
|
* Return 1 (true) on link up.
|
||
|
* Return 0 (false) on link down.
|
||
|
*/
|
||
|
static int pcie_advk_link_up(struct pcie_advk *pcie)
|
||
|
{
|
||
|
u32 val, ltssm_state;
|
||
|
|
||
|
val = advk_readl(pcie, CFG_REG);
|
||
|
ltssm_state = (val >> LTSSM_SHIFT) & LTSSM_MASK;
|
||
|
return ltssm_state >= LTSSM_L0;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* pcie_advk_wait_for_link() - Wait for link training to be accomplished
|
||
|
*
|
||
|
* @pcie: The PCI device to access
|
||
|
*
|
||
|
* Wait up to 1 second for link training to be accomplished.
|
||
|
*
|
||
|
* Return 1 (true) if link training ends up with link up success.
|
||
|
* Return 0 (false) if link training ends up with link up failure.
|
||
|
*/
|
||
|
static int pcie_advk_wait_for_link(struct pcie_advk *pcie)
|
||
|
{
|
||
|
int retries;
|
||
|
|
||
|
/* check if the link is up or not */
|
||
|
for (retries = 0; retries < MAX_RETRIES; retries++) {
|
||
|
if (pcie_advk_link_up(pcie)) {
|
||
|
printf("PCIE-%d: Link up\n", pcie->first_busno);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
udelay(LINK_WAIT_TIMEOUT);
|
||
|
}
|
||
|
|
||
|
printf("PCIE-%d: Link down\n", pcie->first_busno);
|
||
|
|
||
|
return -ETIMEDOUT;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* pcie_advk_setup_hw() - PCIe initailzation
|
||
|
*
|
||
|
* @pcie: The PCI device to access
|
||
|
*
|
||
|
* Return: 0 on success
|
||
|
*/
|
||
|
static int pcie_advk_setup_hw(struct pcie_advk *pcie)
|
||
|
{
|
||
|
u32 reg;
|
||
|
|
||
|
/* Set to Direct mode */
|
||
|
reg = advk_readl(pcie, CTRL_CONFIG_REG);
|
||
|
reg &= ~(CTRL_MODE_MASK << CTRL_MODE_SHIFT);
|
||
|
reg |= ((PCIE_CORE_MODE_DIRECT & CTRL_MODE_MASK) << CTRL_MODE_SHIFT);
|
||
|
advk_writel(pcie, reg, CTRL_CONFIG_REG);
|
||
|
|
||
|
/* Set PCI global control register to RC mode */
|
||
|
reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
|
||
|
reg |= (IS_RC_MSK << IS_RC_SHIFT);
|
||
|
advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
|
||
|
|
||
|
/* Set Advanced Error Capabilities and Control PF0 register */
|
||
|
reg = PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX |
|
||
|
PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX_EN |
|
||
|
PCIE_CORE_ERR_CAPCTL_ECRC_CHECK |
|
||
|
PCIE_CORE_ERR_CAPCTL_ECRC_CHECK_RCV;
|
||
|
advk_writel(pcie, reg, PCIE_CORE_ERR_CAPCTL_REG);
|
||
|
|
||
|
/* Set PCIe Device Control and Status 1 PF0 register */
|
||
|
reg = PCIE_CORE_DEV_CTRL_STATS_RELAX_ORDER_DISABLE |
|
||
|
PCIE_CORE_DEV_CTRL_STATS_SNOOP_DISABLE;
|
||
|
advk_writel(pcie, reg, PCIE_CORE_DEV_CTRL_STATS_REG);
|
||
|
|
||
|
/* Program PCIe Control 2 to disable strict ordering */
|
||
|
reg = PCIE_CORE_CTRL2_RESERVED |
|
||
|
PCIE_CORE_CTRL2_TD_ENABLE;
|
||
|
advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
|
||
|
|
||
|
/* Set GEN2 */
|
||
|
reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
|
||
|
reg &= ~PCIE_GEN_SEL_MSK;
|
||
|
reg |= SPEED_GEN_2;
|
||
|
advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
|
||
|
|
||
|
/* Set lane X1 */
|
||
|
reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
|
||
|
reg &= ~LANE_CNT_MSK;
|
||
|
reg |= LANE_COUNT_1;
|
||
|
advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
|
||
|
|
||
|
/* Enable link training */
|
||
|
reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG);
|
||
|
reg |= LINK_TRAINING_EN;
|
||
|
advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
|
||
|
|
||
|
/*
|
||
|
* Enable AXI address window location generation:
|
||
|
* When it is enabled, the default outbound window
|
||
|
* configurations (Default User Field: 0xD0074CFC)
|
||
|
* are used to transparent address translation for
|
||
|
* the outbound transactions. Thus, PCIe address
|
||
|
* windows are not required.
|
||
|
*/
|
||
|
reg = advk_readl(pcie, PCIE_CORE_CTRL2_REG);
|
||
|
reg |= PCIE_CORE_CTRL2_ADDRWIN_MAP_ENABLE;
|
||
|
advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
|
||
|
|
||
|
/*
|
||
|
* Bypass the address window mapping for PIO:
|
||
|
* Since PIO access already contains all required
|
||
|
* info over AXI interface by PIO registers, the
|
||
|
* address window is not required.
|
||
|
*/
|
||
|
reg = advk_readl(pcie, PIO_CTRL);
|
||
|
reg |= PIO_CTRL_ADDR_WIN_DISABLE;
|
||
|
advk_writel(pcie, reg, PIO_CTRL);
|
||
|
|
||
|
/* Start link training */
|
||
|
reg = advk_readl(pcie, PCIE_CORE_LINK_CTRL_STAT_REG);
|
||
|
reg |= PCIE_CORE_LINK_TRAINING;
|
||
|
advk_writel(pcie, reg, PCIE_CORE_LINK_CTRL_STAT_REG);
|
||
|
|
||
|
/* Wait for PCIe link up */
|
||
|
if (pcie_advk_wait_for_link(pcie))
|
||
|
return -ENXIO;
|
||
|
|
||
|
reg = advk_readl(pcie, PCIE_CORE_CMD_STATUS_REG);
|
||
|
reg |= PCIE_CORE_CMD_MEM_ACCESS_EN |
|
||
|
PCIE_CORE_CMD_IO_ACCESS_EN |
|
||
|
PCIE_CORE_CMD_MEM_IO_REQ_EN;
|
||
|
advk_writel(pcie, reg, PCIE_CORE_CMD_STATUS_REG);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* pcie_advk_probe() - Probe the PCIe bus for active link
|
||
|
*
|
||
|
* @dev: A pointer to the device being operated on
|
||
|
*
|
||
|
* Probe for an active link on the PCIe bus and configure the controller
|
||
|
* to enable this port.
|
||
|
*
|
||
|
* Return: 0 on success, else -ENODEV
|
||
|
*/
|
||
|
static int pcie_advk_probe(struct udevice *dev)
|
||
|
{
|
||
|
struct pcie_advk *pcie = dev_get_priv(dev);
|
||
|
|
||
|
#ifdef CONFIG_DM_GPIO
|
||
|
struct gpio_desc reset_gpio;
|
||
|
|
||
|
gpio_request_by_name(dev, "reset-gpio", 0, &reset_gpio,
|
||
|
GPIOD_IS_OUT);
|
||
|
/*
|
||
|
* Issue reset to add-in card through the dedicated GPIO.
|
||
|
* Some boards are connecting the card reset pin to common system
|
||
|
* reset wire and others are using separate GPIO port.
|
||
|
* In the last case we have to release a reset of the addon card
|
||
|
* using this GPIO.
|
||
|
*
|
||
|
* FIX-ME:
|
||
|
* The PCIe RESET signal is not supposed to be released along
|
||
|
* with the SOC RESET signal. It should be lowered as early as
|
||
|
* possible before PCIe PHY initialization. Moreover, the PCIe
|
||
|
* clock should be gated as well.
|
||
|
*/
|
||
|
if (dm_gpio_is_valid(&reset_gpio)) {
|
||
|
dev_dbg(pcie->dev, "Toggle PCIE Reset GPIO ...\n");
|
||
|
dm_gpio_set_value(&reset_gpio, 0);
|
||
|
mdelay(200);
|
||
|
dm_gpio_set_value(&reset_gpio, 1);
|
||
|
}
|
||
|
#else
|
||
|
dev_dbg(pcie->dev, "PCIE Reset on GPIO support is missing\n");
|
||
|
#endif /* CONFIG_DM_GPIO */
|
||
|
|
||
|
pcie->first_busno = dev->seq;
|
||
|
pcie->dev = pci_get_controller(dev);
|
||
|
|
||
|
return pcie_advk_setup_hw(pcie);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* pcie_advk_ofdata_to_platdata() - Translate from DT to device state
|
||
|
*
|
||
|
* @dev: A pointer to the device being operated on
|
||
|
*
|
||
|
* Translate relevant data from the device tree pertaining to device @dev into
|
||
|
* state that the driver will later make use of. This state is stored in the
|
||
|
* device's private data structure.
|
||
|
*
|
||
|
* Return: 0 on success, else -EINVAL
|
||
|
*/
|
||
|
static int pcie_advk_ofdata_to_platdata(struct udevice *dev)
|
||
|
{
|
||
|
struct pcie_advk *pcie = dev_get_priv(dev);
|
||
|
|
||
|
/* Get the register base address */
|
||
|
pcie->base = (void *)dev_read_addr_index(dev, 0);
|
||
|
if ((fdt_addr_t)pcie->base == FDT_ADDR_T_NONE)
|
||
|
return -EINVAL;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static const struct dm_pci_ops pcie_advk_ops = {
|
||
|
.read_config = pcie_advk_read_config,
|
||
|
.write_config = pcie_advk_write_config,
|
||
|
};
|
||
|
|
||
|
static const struct udevice_id pcie_advk_ids[] = {
|
||
|
{ .compatible = "marvell,armada-37xx-pcie" },
|
||
|
{ }
|
||
|
};
|
||
|
|
||
|
U_BOOT_DRIVER(pcie_advk) = {
|
||
|
.name = "pcie_advk",
|
||
|
.id = UCLASS_PCI,
|
||
|
.of_match = pcie_advk_ids,
|
||
|
.ops = &pcie_advk_ops,
|
||
|
.ofdata_to_platdata = pcie_advk_ofdata_to_platdata,
|
||
|
.probe = pcie_advk_probe,
|
||
|
.priv_auto_alloc_size = sizeof(struct pcie_advk),
|
||
|
};
|