![Ray Jui](/assets/img/avatar_default.png)
Improve the iProc PCIe outbound mapping code by making it more generic and removing redundant device tree properties 'brcm,pcie-ob-window-size' and 'brcm,pcie-ob-oarr-size'. The driver is still backward compatible to device tree binaries with the two properties specified. The driver now automatically configures the correct mapping window size and number of mapping windows based on the value of device tree property 'ranges' and the capability of of the iProc PCIe controller. Signed-off-by: Oza Oza <oza.oza@broadcom.com> Signed-off-by: Ray Jui <ray.jui@broadcom.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Scott Branden <scott.branden@broadcom.com>
946 lines
24 KiB
C
946 lines
24 KiB
C
/*
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* Copyright (C) 2014 Hauke Mehrtens <hauke@hauke-m.de>
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* Copyright (C) 2015 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of 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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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/msi.h>
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/mbus.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/irqchip/arm-gic-v3.h>
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#include <linux/platform_device.h>
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#include <linux/of_address.h>
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#include <linux/of_pci.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <linux/phy/phy.h>
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#include "pcie-iproc.h"
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#define EP_PERST_SOURCE_SELECT_SHIFT 2
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#define EP_PERST_SOURCE_SELECT BIT(EP_PERST_SOURCE_SELECT_SHIFT)
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#define EP_MODE_SURVIVE_PERST_SHIFT 1
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#define EP_MODE_SURVIVE_PERST BIT(EP_MODE_SURVIVE_PERST_SHIFT)
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#define RC_PCIE_RST_OUTPUT_SHIFT 0
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#define RC_PCIE_RST_OUTPUT BIT(RC_PCIE_RST_OUTPUT_SHIFT)
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#define PAXC_RESET_MASK 0x7f
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#define GIC_V3_CFG_SHIFT 0
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#define GIC_V3_CFG BIT(GIC_V3_CFG_SHIFT)
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#define MSI_ENABLE_CFG_SHIFT 0
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#define MSI_ENABLE_CFG BIT(MSI_ENABLE_CFG_SHIFT)
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#define CFG_IND_ADDR_MASK 0x00001ffc
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#define CFG_ADDR_BUS_NUM_SHIFT 20
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#define CFG_ADDR_BUS_NUM_MASK 0x0ff00000
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#define CFG_ADDR_DEV_NUM_SHIFT 15
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#define CFG_ADDR_DEV_NUM_MASK 0x000f8000
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#define CFG_ADDR_FUNC_NUM_SHIFT 12
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#define CFG_ADDR_FUNC_NUM_MASK 0x00007000
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#define CFG_ADDR_REG_NUM_SHIFT 2
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#define CFG_ADDR_REG_NUM_MASK 0x00000ffc
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#define CFG_ADDR_CFG_TYPE_SHIFT 0
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#define CFG_ADDR_CFG_TYPE_MASK 0x00000003
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#define SYS_RC_INTX_MASK 0xf
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#define PCIE_PHYLINKUP_SHIFT 3
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#define PCIE_PHYLINKUP BIT(PCIE_PHYLINKUP_SHIFT)
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#define PCIE_DL_ACTIVE_SHIFT 2
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#define PCIE_DL_ACTIVE BIT(PCIE_DL_ACTIVE_SHIFT)
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#define APB_ERR_EN_SHIFT 0
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#define APB_ERR_EN BIT(APB_ERR_EN_SHIFT)
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/* derive the enum index of the outbound/inbound mapping registers */
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#define MAP_REG(base_reg, index) ((base_reg) + (index) * 2)
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/*
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* Maximum number of outbound mapping window sizes that can be supported by any
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* OARR/OMAP mapping pair
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*/
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#define MAX_NUM_OB_WINDOW_SIZES 4
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#define OARR_VALID_SHIFT 0
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#define OARR_VALID BIT(OARR_VALID_SHIFT)
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#define OARR_SIZE_CFG_SHIFT 1
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#define PCI_EXP_CAP 0xac
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#define IPROC_PCIE_REG_INVALID 0xffff
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/**
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* iProc PCIe outbound mapping controller specific parameters
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*
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* @window_sizes: list of supported outbound mapping window sizes in MB
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* @nr_sizes: number of supported outbound mapping window sizes
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*/
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struct iproc_pcie_ob_map {
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resource_size_t window_sizes[MAX_NUM_OB_WINDOW_SIZES];
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unsigned int nr_sizes;
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};
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static const struct iproc_pcie_ob_map paxb_ob_map[] = {
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{
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/* OARR0/OMAP0 */
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.window_sizes = { 128, 256 },
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.nr_sizes = 2,
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},
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{
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/* OARR1/OMAP1 */
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.window_sizes = { 128, 256 },
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.nr_sizes = 2,
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},
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};
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/*
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* iProc PCIe host registers
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*/
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enum iproc_pcie_reg {
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/* clock/reset signal control */
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IPROC_PCIE_CLK_CTRL = 0,
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/*
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* To allow MSI to be steered to an external MSI controller (e.g., ARM
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* GICv3 ITS)
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*/
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IPROC_PCIE_MSI_GIC_MODE,
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/*
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* IPROC_PCIE_MSI_BASE_ADDR and IPROC_PCIE_MSI_WINDOW_SIZE define the
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* window where the MSI posted writes are written, for the writes to be
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* interpreted as MSI writes.
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*/
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IPROC_PCIE_MSI_BASE_ADDR,
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IPROC_PCIE_MSI_WINDOW_SIZE,
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/*
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* To hold the address of the register where the MSI writes are
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* programed. When ARM GICv3 ITS is used, this should be programmed
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* with the address of the GITS_TRANSLATER register.
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*/
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IPROC_PCIE_MSI_ADDR_LO,
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IPROC_PCIE_MSI_ADDR_HI,
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/* enable MSI */
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IPROC_PCIE_MSI_EN_CFG,
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/* allow access to root complex configuration space */
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IPROC_PCIE_CFG_IND_ADDR,
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IPROC_PCIE_CFG_IND_DATA,
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/* allow access to device configuration space */
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IPROC_PCIE_CFG_ADDR,
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IPROC_PCIE_CFG_DATA,
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/* enable INTx */
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IPROC_PCIE_INTX_EN,
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/* outbound address mapping */
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IPROC_PCIE_OARR0,
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IPROC_PCIE_OMAP0,
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IPROC_PCIE_OARR1,
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IPROC_PCIE_OMAP1,
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IPROC_PCIE_OARR2,
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IPROC_PCIE_OMAP2,
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IPROC_PCIE_OARR3,
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IPROC_PCIE_OMAP3,
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/* link status */
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IPROC_PCIE_LINK_STATUS,
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/* enable APB error for unsupported requests */
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IPROC_PCIE_APB_ERR_EN,
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/* total number of core registers */
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IPROC_PCIE_MAX_NUM_REG,
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};
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/* iProc PCIe PAXB BCMA registers */
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static const u16 iproc_pcie_reg_paxb_bcma[] = {
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[IPROC_PCIE_CLK_CTRL] = 0x000,
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[IPROC_PCIE_CFG_IND_ADDR] = 0x120,
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[IPROC_PCIE_CFG_IND_DATA] = 0x124,
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[IPROC_PCIE_CFG_ADDR] = 0x1f8,
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[IPROC_PCIE_CFG_DATA] = 0x1fc,
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[IPROC_PCIE_INTX_EN] = 0x330,
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[IPROC_PCIE_LINK_STATUS] = 0xf0c,
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};
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/* iProc PCIe PAXB registers */
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static const u16 iproc_pcie_reg_paxb[] = {
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[IPROC_PCIE_CLK_CTRL] = 0x000,
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[IPROC_PCIE_CFG_IND_ADDR] = 0x120,
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[IPROC_PCIE_CFG_IND_DATA] = 0x124,
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[IPROC_PCIE_CFG_ADDR] = 0x1f8,
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[IPROC_PCIE_CFG_DATA] = 0x1fc,
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[IPROC_PCIE_INTX_EN] = 0x330,
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[IPROC_PCIE_OARR0] = 0xd20,
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[IPROC_PCIE_OMAP0] = 0xd40,
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[IPROC_PCIE_OARR1] = 0xd28,
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[IPROC_PCIE_OMAP1] = 0xd48,
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[IPROC_PCIE_LINK_STATUS] = 0xf0c,
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[IPROC_PCIE_APB_ERR_EN] = 0xf40,
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};
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/* iProc PCIe PAXC v1 registers */
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static const u16 iproc_pcie_reg_paxc[] = {
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[IPROC_PCIE_CLK_CTRL] = 0x000,
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[IPROC_PCIE_CFG_IND_ADDR] = 0x1f0,
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[IPROC_PCIE_CFG_IND_DATA] = 0x1f4,
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[IPROC_PCIE_CFG_ADDR] = 0x1f8,
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[IPROC_PCIE_CFG_DATA] = 0x1fc,
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};
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/* iProc PCIe PAXC v2 registers */
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static const u16 iproc_pcie_reg_paxc_v2[] = {
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[IPROC_PCIE_MSI_GIC_MODE] = 0x050,
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[IPROC_PCIE_MSI_BASE_ADDR] = 0x074,
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[IPROC_PCIE_MSI_WINDOW_SIZE] = 0x078,
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[IPROC_PCIE_MSI_ADDR_LO] = 0x07c,
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[IPROC_PCIE_MSI_ADDR_HI] = 0x080,
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[IPROC_PCIE_MSI_EN_CFG] = 0x09c,
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[IPROC_PCIE_CFG_IND_ADDR] = 0x1f0,
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[IPROC_PCIE_CFG_IND_DATA] = 0x1f4,
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[IPROC_PCIE_CFG_ADDR] = 0x1f8,
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[IPROC_PCIE_CFG_DATA] = 0x1fc,
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};
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static inline struct iproc_pcie *iproc_data(struct pci_bus *bus)
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{
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struct iproc_pcie *pcie;
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#ifdef CONFIG_ARM
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struct pci_sys_data *sys = bus->sysdata;
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pcie = sys->private_data;
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#else
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pcie = bus->sysdata;
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#endif
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return pcie;
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}
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static inline bool iproc_pcie_reg_is_invalid(u16 reg_offset)
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{
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return !!(reg_offset == IPROC_PCIE_REG_INVALID);
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}
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static inline u16 iproc_pcie_reg_offset(struct iproc_pcie *pcie,
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enum iproc_pcie_reg reg)
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{
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return pcie->reg_offsets[reg];
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}
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static inline u32 iproc_pcie_read_reg(struct iproc_pcie *pcie,
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enum iproc_pcie_reg reg)
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{
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u16 offset = iproc_pcie_reg_offset(pcie, reg);
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if (iproc_pcie_reg_is_invalid(offset))
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return 0;
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return readl(pcie->base + offset);
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}
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static inline void iproc_pcie_write_reg(struct iproc_pcie *pcie,
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enum iproc_pcie_reg reg, u32 val)
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{
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u16 offset = iproc_pcie_reg_offset(pcie, reg);
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if (iproc_pcie_reg_is_invalid(offset))
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return;
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writel(val, pcie->base + offset);
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}
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/**
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* APB error forwarding can be disabled during access of configuration
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* registers of the endpoint device, to prevent unsupported requests
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* (typically seen during enumeration with multi-function devices) from
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* triggering a system exception.
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*/
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static inline void iproc_pcie_apb_err_disable(struct pci_bus *bus,
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bool disable)
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{
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struct iproc_pcie *pcie = iproc_data(bus);
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u32 val;
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if (bus->number && pcie->has_apb_err_disable) {
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val = iproc_pcie_read_reg(pcie, IPROC_PCIE_APB_ERR_EN);
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if (disable)
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val &= ~APB_ERR_EN;
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else
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val |= APB_ERR_EN;
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iproc_pcie_write_reg(pcie, IPROC_PCIE_APB_ERR_EN, val);
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}
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}
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/**
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* Note access to the configuration registers are protected at the higher layer
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* by 'pci_lock' in drivers/pci/access.c
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*/
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static void __iomem *iproc_pcie_map_cfg_bus(struct pci_bus *bus,
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unsigned int devfn,
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int where)
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{
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struct iproc_pcie *pcie = iproc_data(bus);
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unsigned slot = PCI_SLOT(devfn);
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unsigned fn = PCI_FUNC(devfn);
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unsigned busno = bus->number;
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u32 val;
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u16 offset;
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/* root complex access */
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if (busno == 0) {
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if (slot > 0 || fn > 0)
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return NULL;
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iproc_pcie_write_reg(pcie, IPROC_PCIE_CFG_IND_ADDR,
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where & CFG_IND_ADDR_MASK);
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offset = iproc_pcie_reg_offset(pcie, IPROC_PCIE_CFG_IND_DATA);
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if (iproc_pcie_reg_is_invalid(offset))
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return NULL;
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else
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return (pcie->base + offset);
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}
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/*
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* PAXC is connected to an internally emulated EP within the SoC. It
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* allows only one device.
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*/
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if (pcie->ep_is_internal)
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if (slot > 0)
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return NULL;
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/* EP device access */
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val = (busno << CFG_ADDR_BUS_NUM_SHIFT) |
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(slot << CFG_ADDR_DEV_NUM_SHIFT) |
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(fn << CFG_ADDR_FUNC_NUM_SHIFT) |
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(where & CFG_ADDR_REG_NUM_MASK) |
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(1 & CFG_ADDR_CFG_TYPE_MASK);
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iproc_pcie_write_reg(pcie, IPROC_PCIE_CFG_ADDR, val);
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offset = iproc_pcie_reg_offset(pcie, IPROC_PCIE_CFG_DATA);
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if (iproc_pcie_reg_is_invalid(offset))
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return NULL;
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else
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return (pcie->base + offset);
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}
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static int iproc_pcie_config_read32(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 *val)
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{
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int ret;
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iproc_pcie_apb_err_disable(bus, true);
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ret = pci_generic_config_read32(bus, devfn, where, size, val);
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iproc_pcie_apb_err_disable(bus, false);
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return ret;
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}
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static int iproc_pcie_config_write32(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 val)
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{
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int ret;
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iproc_pcie_apb_err_disable(bus, true);
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ret = pci_generic_config_write32(bus, devfn, where, size, val);
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iproc_pcie_apb_err_disable(bus, false);
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return ret;
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}
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static struct pci_ops iproc_pcie_ops = {
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.map_bus = iproc_pcie_map_cfg_bus,
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.read = iproc_pcie_config_read32,
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.write = iproc_pcie_config_write32,
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};
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static void iproc_pcie_reset(struct iproc_pcie *pcie)
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{
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u32 val;
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/*
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* PAXC and the internal emulated endpoint device downstream should not
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* be reset. If firmware has been loaded on the endpoint device at an
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* earlier boot stage, reset here causes issues.
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*/
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if (pcie->ep_is_internal)
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return;
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/*
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* Select perst_b signal as reset source. Put the device into reset,
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* and then bring it out of reset
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*/
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val = iproc_pcie_read_reg(pcie, IPROC_PCIE_CLK_CTRL);
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val &= ~EP_PERST_SOURCE_SELECT & ~EP_MODE_SURVIVE_PERST &
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~RC_PCIE_RST_OUTPUT;
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iproc_pcie_write_reg(pcie, IPROC_PCIE_CLK_CTRL, val);
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udelay(250);
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val |= RC_PCIE_RST_OUTPUT;
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iproc_pcie_write_reg(pcie, IPROC_PCIE_CLK_CTRL, val);
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msleep(100);
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}
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static int iproc_pcie_check_link(struct iproc_pcie *pcie, struct pci_bus *bus)
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{
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struct device *dev = pcie->dev;
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u8 hdr_type;
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u32 link_ctrl, class, val;
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u16 pos = PCI_EXP_CAP, link_status;
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bool link_is_active = false;
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/*
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* PAXC connects to emulated endpoint devices directly and does not
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* have a Serdes. Therefore skip the link detection logic here.
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*/
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if (pcie->ep_is_internal)
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return 0;
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val = iproc_pcie_read_reg(pcie, IPROC_PCIE_LINK_STATUS);
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if (!(val & PCIE_PHYLINKUP) || !(val & PCIE_DL_ACTIVE)) {
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dev_err(dev, "PHY or data link is INACTIVE!\n");
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return -ENODEV;
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}
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/* make sure we are not in EP mode */
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pci_bus_read_config_byte(bus, 0, PCI_HEADER_TYPE, &hdr_type);
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if ((hdr_type & 0x7f) != PCI_HEADER_TYPE_BRIDGE) {
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dev_err(dev, "in EP mode, hdr=%#02x\n", hdr_type);
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return -EFAULT;
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}
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/* force class to PCI_CLASS_BRIDGE_PCI (0x0604) */
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#define PCI_BRIDGE_CTRL_REG_OFFSET 0x43c
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#define PCI_CLASS_BRIDGE_MASK 0xffff00
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#define PCI_CLASS_BRIDGE_SHIFT 8
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pci_bus_read_config_dword(bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, &class);
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class &= ~PCI_CLASS_BRIDGE_MASK;
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class |= (PCI_CLASS_BRIDGE_PCI << PCI_CLASS_BRIDGE_SHIFT);
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pci_bus_write_config_dword(bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, class);
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/* check link status to see if link is active */
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pci_bus_read_config_word(bus, 0, pos + PCI_EXP_LNKSTA, &link_status);
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if (link_status & PCI_EXP_LNKSTA_NLW)
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link_is_active = true;
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if (!link_is_active) {
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/* try GEN 1 link speed */
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#define PCI_TARGET_LINK_SPEED_MASK 0xf
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#define PCI_TARGET_LINK_SPEED_GEN2 0x2
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#define PCI_TARGET_LINK_SPEED_GEN1 0x1
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pci_bus_read_config_dword(bus, 0,
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pos + PCI_EXP_LNKCTL2,
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&link_ctrl);
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if ((link_ctrl & PCI_TARGET_LINK_SPEED_MASK) ==
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PCI_TARGET_LINK_SPEED_GEN2) {
|
|
link_ctrl &= ~PCI_TARGET_LINK_SPEED_MASK;
|
|
link_ctrl |= PCI_TARGET_LINK_SPEED_GEN1;
|
|
pci_bus_write_config_dword(bus, 0,
|
|
pos + PCI_EXP_LNKCTL2,
|
|
link_ctrl);
|
|
msleep(100);
|
|
|
|
pci_bus_read_config_word(bus, 0, pos + PCI_EXP_LNKSTA,
|
|
&link_status);
|
|
if (link_status & PCI_EXP_LNKSTA_NLW)
|
|
link_is_active = true;
|
|
}
|
|
}
|
|
|
|
dev_info(dev, "link: %s\n", link_is_active ? "UP" : "DOWN");
|
|
|
|
return link_is_active ? 0 : -ENODEV;
|
|
}
|
|
|
|
static void iproc_pcie_enable(struct iproc_pcie *pcie)
|
|
{
|
|
iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, SYS_RC_INTX_MASK);
|
|
}
|
|
|
|
static inline bool iproc_pcie_ob_is_valid(struct iproc_pcie *pcie,
|
|
int window_idx)
|
|
{
|
|
u32 val;
|
|
|
|
val = iproc_pcie_read_reg(pcie, MAP_REG(IPROC_PCIE_OARR0, window_idx));
|
|
|
|
return !!(val & OARR_VALID);
|
|
}
|
|
|
|
static inline int iproc_pcie_ob_write(struct iproc_pcie *pcie, int window_idx,
|
|
int size_idx, u64 axi_addr, u64 pci_addr)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
u16 oarr_offset, omap_offset;
|
|
|
|
/*
|
|
* Derive the OARR/OMAP offset from the first pair (OARR0/OMAP0) based
|
|
* on window index.
|
|
*/
|
|
oarr_offset = iproc_pcie_reg_offset(pcie, MAP_REG(IPROC_PCIE_OARR0,
|
|
window_idx));
|
|
omap_offset = iproc_pcie_reg_offset(pcie, MAP_REG(IPROC_PCIE_OMAP0,
|
|
window_idx));
|
|
if (iproc_pcie_reg_is_invalid(oarr_offset) ||
|
|
iproc_pcie_reg_is_invalid(omap_offset))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Program the OARR registers. The upper 32-bit OARR register is
|
|
* always right after the lower 32-bit OARR register.
|
|
*/
|
|
writel(lower_32_bits(axi_addr) | (size_idx << OARR_SIZE_CFG_SHIFT) |
|
|
OARR_VALID, pcie->base + oarr_offset);
|
|
writel(upper_32_bits(axi_addr), pcie->base + oarr_offset + 4);
|
|
|
|
/* now program the OMAP registers */
|
|
writel(lower_32_bits(pci_addr), pcie->base + omap_offset);
|
|
writel(upper_32_bits(pci_addr), pcie->base + omap_offset + 4);
|
|
|
|
dev_info(dev, "ob window [%d]: offset 0x%x axi %pap pci %pap\n",
|
|
window_idx, oarr_offset, &axi_addr, &pci_addr);
|
|
dev_info(dev, "oarr lo 0x%x oarr hi 0x%x\n",
|
|
readl(pcie->base + oarr_offset),
|
|
readl(pcie->base + oarr_offset + 4));
|
|
dev_info(dev, "omap lo 0x%x omap hi 0x%x\n",
|
|
readl(pcie->base + omap_offset),
|
|
readl(pcie->base + omap_offset + 4));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Some iProc SoCs require the SW to configure the outbound address mapping
|
|
*
|
|
* Outbound address translation:
|
|
*
|
|
* iproc_pcie_address = axi_address - axi_offset
|
|
* OARR = iproc_pcie_address
|
|
* OMAP = pci_addr
|
|
*
|
|
* axi_addr -> iproc_pcie_address -> OARR -> OMAP -> pci_address
|
|
*/
|
|
static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
|
|
u64 pci_addr, resource_size_t size)
|
|
{
|
|
struct iproc_pcie_ob *ob = &pcie->ob;
|
|
struct device *dev = pcie->dev;
|
|
int ret = -EINVAL, window_idx, size_idx;
|
|
|
|
if (axi_addr < ob->axi_offset) {
|
|
dev_err(dev, "axi address %pap less than offset %pap\n",
|
|
&axi_addr, &ob->axi_offset);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Translate the AXI address to the internal address used by the iProc
|
|
* PCIe core before programming the OARR
|
|
*/
|
|
axi_addr -= ob->axi_offset;
|
|
|
|
/* iterate through all OARR/OMAP mapping windows */
|
|
for (window_idx = ob->nr_windows - 1; window_idx >= 0; window_idx--) {
|
|
const struct iproc_pcie_ob_map *ob_map =
|
|
&pcie->ob_map[window_idx];
|
|
|
|
/*
|
|
* If current outbound window is already in use, move on to the
|
|
* next one.
|
|
*/
|
|
if (iproc_pcie_ob_is_valid(pcie, window_idx))
|
|
continue;
|
|
|
|
/*
|
|
* Iterate through all supported window sizes within the
|
|
* OARR/OMAP pair to find a match. Go through the window sizes
|
|
* in a descending order.
|
|
*/
|
|
for (size_idx = ob_map->nr_sizes - 1; size_idx >= 0;
|
|
size_idx--) {
|
|
resource_size_t window_size =
|
|
ob_map->window_sizes[size_idx] * SZ_1M;
|
|
|
|
if (size < window_size)
|
|
continue;
|
|
|
|
if (!IS_ALIGNED(axi_addr, window_size) ||
|
|
!IS_ALIGNED(pci_addr, window_size)) {
|
|
dev_err(dev,
|
|
"axi %pap or pci %pap not aligned\n",
|
|
&axi_addr, &pci_addr);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Match found! Program both OARR and OMAP and mark
|
|
* them as a valid entry.
|
|
*/
|
|
ret = iproc_pcie_ob_write(pcie, window_idx, size_idx,
|
|
axi_addr, pci_addr);
|
|
if (ret)
|
|
goto err_ob;
|
|
|
|
size -= window_size;
|
|
if (size == 0)
|
|
return 0;
|
|
|
|
/*
|
|
* If we are here, we are done with the current window,
|
|
* but not yet finished all mappings. Need to move on
|
|
* to the next window.
|
|
*/
|
|
axi_addr += window_size;
|
|
pci_addr += window_size;
|
|
break;
|
|
}
|
|
}
|
|
|
|
err_ob:
|
|
dev_err(dev, "unable to configure outbound mapping\n");
|
|
dev_err(dev,
|
|
"axi %pap, axi offset %pap, pci %pap, res size %pap\n",
|
|
&axi_addr, &ob->axi_offset, &pci_addr, &size);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int iproc_pcie_map_ranges(struct iproc_pcie *pcie,
|
|
struct list_head *resources)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct resource_entry *window;
|
|
int ret;
|
|
|
|
resource_list_for_each_entry(window, resources) {
|
|
struct resource *res = window->res;
|
|
u64 res_type = resource_type(res);
|
|
|
|
switch (res_type) {
|
|
case IORESOURCE_IO:
|
|
case IORESOURCE_BUS:
|
|
break;
|
|
case IORESOURCE_MEM:
|
|
ret = iproc_pcie_setup_ob(pcie, res->start,
|
|
res->start - window->offset,
|
|
resource_size(res));
|
|
if (ret)
|
|
return ret;
|
|
break;
|
|
default:
|
|
dev_err(dev, "invalid resource %pR\n", res);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iproce_pcie_get_msi(struct iproc_pcie *pcie,
|
|
struct device_node *msi_node,
|
|
u64 *msi_addr)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
int ret;
|
|
struct resource res;
|
|
|
|
/*
|
|
* Check if 'msi-map' points to ARM GICv3 ITS, which is the only
|
|
* supported external MSI controller that requires steering.
|
|
*/
|
|
if (!of_device_is_compatible(msi_node, "arm,gic-v3-its")) {
|
|
dev_err(dev, "unable to find compatible MSI controller\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* derive GITS_TRANSLATER address from GICv3 */
|
|
ret = of_address_to_resource(msi_node, 0, &res);
|
|
if (ret < 0) {
|
|
dev_err(dev, "unable to obtain MSI controller resources\n");
|
|
return ret;
|
|
}
|
|
|
|
*msi_addr = res.start + GITS_TRANSLATER;
|
|
return 0;
|
|
}
|
|
|
|
static void iproc_pcie_paxc_v2_msi_steer(struct iproc_pcie *pcie, u64 msi_addr)
|
|
{
|
|
u32 val;
|
|
|
|
/*
|
|
* Program bits [43:13] of address of GITS_TRANSLATER register into
|
|
* bits [30:0] of the MSI base address register. In fact, in all iProc
|
|
* based SoCs, all I/O register bases are well below the 32-bit
|
|
* boundary, so we can safely assume bits [43:32] are always zeros.
|
|
*/
|
|
iproc_pcie_write_reg(pcie, IPROC_PCIE_MSI_BASE_ADDR,
|
|
(u32)(msi_addr >> 13));
|
|
|
|
/* use a default 8K window size */
|
|
iproc_pcie_write_reg(pcie, IPROC_PCIE_MSI_WINDOW_SIZE, 0);
|
|
|
|
/* steering MSI to GICv3 ITS */
|
|
val = iproc_pcie_read_reg(pcie, IPROC_PCIE_MSI_GIC_MODE);
|
|
val |= GIC_V3_CFG;
|
|
iproc_pcie_write_reg(pcie, IPROC_PCIE_MSI_GIC_MODE, val);
|
|
|
|
/*
|
|
* Program bits [43:2] of address of GITS_TRANSLATER register into the
|
|
* iProc MSI address registers.
|
|
*/
|
|
msi_addr >>= 2;
|
|
iproc_pcie_write_reg(pcie, IPROC_PCIE_MSI_ADDR_HI,
|
|
upper_32_bits(msi_addr));
|
|
iproc_pcie_write_reg(pcie, IPROC_PCIE_MSI_ADDR_LO,
|
|
lower_32_bits(msi_addr));
|
|
|
|
/* enable MSI */
|
|
val = iproc_pcie_read_reg(pcie, IPROC_PCIE_MSI_EN_CFG);
|
|
val |= MSI_ENABLE_CFG;
|
|
iproc_pcie_write_reg(pcie, IPROC_PCIE_MSI_EN_CFG, val);
|
|
}
|
|
|
|
static int iproc_pcie_msi_steer(struct iproc_pcie *pcie,
|
|
struct device_node *msi_node)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
int ret;
|
|
u64 msi_addr;
|
|
|
|
ret = iproce_pcie_get_msi(pcie, msi_node, &msi_addr);
|
|
if (ret < 0) {
|
|
dev_err(dev, "msi steering failed\n");
|
|
return ret;
|
|
}
|
|
|
|
switch (pcie->type) {
|
|
case IPROC_PCIE_PAXC_V2:
|
|
iproc_pcie_paxc_v2_msi_steer(pcie, msi_addr);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iproc_pcie_msi_enable(struct iproc_pcie *pcie)
|
|
{
|
|
struct device_node *msi_node;
|
|
int ret;
|
|
|
|
/*
|
|
* Either the "msi-parent" or the "msi-map" phandle needs to exist
|
|
* for us to obtain the MSI node.
|
|
*/
|
|
|
|
msi_node = of_parse_phandle(pcie->dev->of_node, "msi-parent", 0);
|
|
if (!msi_node) {
|
|
const __be32 *msi_map = NULL;
|
|
int len;
|
|
u32 phandle;
|
|
|
|
msi_map = of_get_property(pcie->dev->of_node, "msi-map", &len);
|
|
if (!msi_map)
|
|
return -ENODEV;
|
|
|
|
phandle = be32_to_cpup(msi_map + 1);
|
|
msi_node = of_find_node_by_phandle(phandle);
|
|
if (!msi_node)
|
|
return -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* Certain revisions of the iProc PCIe controller require additional
|
|
* configurations to steer the MSI writes towards an external MSI
|
|
* controller.
|
|
*/
|
|
if (pcie->need_msi_steer) {
|
|
ret = iproc_pcie_msi_steer(pcie, msi_node);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* If another MSI controller is being used, the call below should fail
|
|
* but that is okay
|
|
*/
|
|
return iproc_msi_init(pcie, msi_node);
|
|
}
|
|
|
|
static void iproc_pcie_msi_disable(struct iproc_pcie *pcie)
|
|
{
|
|
iproc_msi_exit(pcie);
|
|
}
|
|
|
|
static int iproc_pcie_rev_init(struct iproc_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
unsigned int reg_idx;
|
|
const u16 *regs;
|
|
|
|
switch (pcie->type) {
|
|
case IPROC_PCIE_PAXB_BCMA:
|
|
regs = iproc_pcie_reg_paxb_bcma;
|
|
break;
|
|
case IPROC_PCIE_PAXB:
|
|
regs = iproc_pcie_reg_paxb;
|
|
pcie->has_apb_err_disable = true;
|
|
if (pcie->need_ob_cfg) {
|
|
pcie->ob_map = paxb_ob_map;
|
|
pcie->ob.nr_windows = ARRAY_SIZE(paxb_ob_map);
|
|
}
|
|
break;
|
|
case IPROC_PCIE_PAXC:
|
|
regs = iproc_pcie_reg_paxc;
|
|
pcie->ep_is_internal = true;
|
|
break;
|
|
case IPROC_PCIE_PAXC_V2:
|
|
regs = iproc_pcie_reg_paxc_v2;
|
|
pcie->ep_is_internal = true;
|
|
pcie->need_msi_steer = true;
|
|
break;
|
|
default:
|
|
dev_err(dev, "incompatible iProc PCIe interface\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
pcie->reg_offsets = devm_kcalloc(dev, IPROC_PCIE_MAX_NUM_REG,
|
|
sizeof(*pcie->reg_offsets),
|
|
GFP_KERNEL);
|
|
if (!pcie->reg_offsets)
|
|
return -ENOMEM;
|
|
|
|
/* go through the register table and populate all valid registers */
|
|
pcie->reg_offsets[0] = (pcie->type == IPROC_PCIE_PAXC_V2) ?
|
|
IPROC_PCIE_REG_INVALID : regs[0];
|
|
for (reg_idx = 1; reg_idx < IPROC_PCIE_MAX_NUM_REG; reg_idx++)
|
|
pcie->reg_offsets[reg_idx] = regs[reg_idx] ?
|
|
regs[reg_idx] : IPROC_PCIE_REG_INVALID;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
|
|
{
|
|
struct device *dev;
|
|
int ret;
|
|
void *sysdata;
|
|
struct pci_bus *bus;
|
|
|
|
dev = pcie->dev;
|
|
|
|
ret = iproc_pcie_rev_init(pcie);
|
|
if (ret) {
|
|
dev_err(dev, "unable to initialize controller parameters\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_request_pci_bus_resources(dev, res);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = phy_init(pcie->phy);
|
|
if (ret) {
|
|
dev_err(dev, "unable to initialize PCIe PHY\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = phy_power_on(pcie->phy);
|
|
if (ret) {
|
|
dev_err(dev, "unable to power on PCIe PHY\n");
|
|
goto err_exit_phy;
|
|
}
|
|
|
|
iproc_pcie_reset(pcie);
|
|
|
|
if (pcie->need_ob_cfg) {
|
|
ret = iproc_pcie_map_ranges(pcie, res);
|
|
if (ret) {
|
|
dev_err(dev, "map failed\n");
|
|
goto err_power_off_phy;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_ARM
|
|
pcie->sysdata.private_data = pcie;
|
|
sysdata = &pcie->sysdata;
|
|
#else
|
|
sysdata = pcie;
|
|
#endif
|
|
|
|
bus = pci_create_root_bus(dev, 0, &iproc_pcie_ops, sysdata, res);
|
|
if (!bus) {
|
|
dev_err(dev, "unable to create PCI root bus\n");
|
|
ret = -ENOMEM;
|
|
goto err_power_off_phy;
|
|
}
|
|
pcie->root_bus = bus;
|
|
|
|
ret = iproc_pcie_check_link(pcie, bus);
|
|
if (ret) {
|
|
dev_err(dev, "no PCIe EP device detected\n");
|
|
goto err_rm_root_bus;
|
|
}
|
|
|
|
iproc_pcie_enable(pcie);
|
|
|
|
if (IS_ENABLED(CONFIG_PCI_MSI))
|
|
if (iproc_pcie_msi_enable(pcie))
|
|
dev_info(dev, "not using iProc MSI\n");
|
|
|
|
pci_scan_child_bus(bus);
|
|
pci_assign_unassigned_bus_resources(bus);
|
|
pci_fixup_irqs(pci_common_swizzle, pcie->map_irq);
|
|
pci_bus_add_devices(bus);
|
|
|
|
return 0;
|
|
|
|
err_rm_root_bus:
|
|
pci_stop_root_bus(bus);
|
|
pci_remove_root_bus(bus);
|
|
|
|
err_power_off_phy:
|
|
phy_power_off(pcie->phy);
|
|
err_exit_phy:
|
|
phy_exit(pcie->phy);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(iproc_pcie_setup);
|
|
|
|
int iproc_pcie_remove(struct iproc_pcie *pcie)
|
|
{
|
|
pci_stop_root_bus(pcie->root_bus);
|
|
pci_remove_root_bus(pcie->root_bus);
|
|
|
|
iproc_pcie_msi_disable(pcie);
|
|
|
|
phy_power_off(pcie->phy);
|
|
phy_exit(pcie->phy);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(iproc_pcie_remove);
|
|
|
|
MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
|
|
MODULE_DESCRIPTION("Broadcom iPROC PCIe common driver");
|
|
MODULE_LICENSE("GPL v2");
|