diff options
Diffstat (limited to 'drivers/pci/host/pcie-iproc.c')
| -rw-r--r-- | drivers/pci/host/pcie-iproc.c | 1371 |
1 files changed, 0 insertions, 1371 deletions
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c deleted file mode 100644 index c57486348856..000000000000 --- a/drivers/pci/host/pcie-iproc.c +++ /dev/null @@ -1,1371 +0,0 @@ -/* - * Copyright (C) 2014 Hauke Mehrtens <hauke@hauke-m.de> - * Copyright (C) 2015 Broadcom Corporation - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation version 2. - * - * This program is distributed "as is" WITHOUT ANY WARRANTY of any - * kind, whether express or implied; without even the implied warranty - * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - -#include <linux/kernel.h> -#include <linux/pci.h> -#include <linux/msi.h> -#include <linux/clk.h> -#include <linux/module.h> -#include <linux/mbus.h> -#include <linux/slab.h> -#include <linux/delay.h> -#include <linux/interrupt.h> -#include <linux/irqchip/arm-gic-v3.h> -#include <linux/platform_device.h> -#include <linux/of_address.h> -#include <linux/of_pci.h> -#include <linux/of_irq.h> -#include <linux/of_platform.h> -#include <linux/phy/phy.h> - -#include "pcie-iproc.h" - -#define EP_PERST_SOURCE_SELECT_SHIFT 2 -#define EP_PERST_SOURCE_SELECT BIT(EP_PERST_SOURCE_SELECT_SHIFT) -#define EP_MODE_SURVIVE_PERST_SHIFT 1 -#define EP_MODE_SURVIVE_PERST BIT(EP_MODE_SURVIVE_PERST_SHIFT) -#define RC_PCIE_RST_OUTPUT_SHIFT 0 -#define RC_PCIE_RST_OUTPUT BIT(RC_PCIE_RST_OUTPUT_SHIFT) -#define PAXC_RESET_MASK 0x7f - -#define GIC_V3_CFG_SHIFT 0 -#define GIC_V3_CFG BIT(GIC_V3_CFG_SHIFT) - -#define MSI_ENABLE_CFG_SHIFT 0 -#define MSI_ENABLE_CFG BIT(MSI_ENABLE_CFG_SHIFT) - -#define CFG_IND_ADDR_MASK 0x00001ffc - -#define CFG_ADDR_BUS_NUM_SHIFT 20 -#define CFG_ADDR_BUS_NUM_MASK 0x0ff00000 -#define CFG_ADDR_DEV_NUM_SHIFT 15 -#define CFG_ADDR_DEV_NUM_MASK 0x000f8000 -#define CFG_ADDR_FUNC_NUM_SHIFT 12 -#define CFG_ADDR_FUNC_NUM_MASK 0x00007000 -#define CFG_ADDR_REG_NUM_SHIFT 2 -#define CFG_ADDR_REG_NUM_MASK 0x00000ffc -#define CFG_ADDR_CFG_TYPE_SHIFT 0 -#define CFG_ADDR_CFG_TYPE_MASK 0x00000003 - -#define SYS_RC_INTX_MASK 0xf - -#define PCIE_PHYLINKUP_SHIFT 3 -#define PCIE_PHYLINKUP BIT(PCIE_PHYLINKUP_SHIFT) -#define PCIE_DL_ACTIVE_SHIFT 2 -#define PCIE_DL_ACTIVE BIT(PCIE_DL_ACTIVE_SHIFT) - -#define APB_ERR_EN_SHIFT 0 -#define APB_ERR_EN BIT(APB_ERR_EN_SHIFT) - -/* derive the enum index of the outbound/inbound mapping registers */ -#define MAP_REG(base_reg, index) ((base_reg) + (index) * 2) - -/* - * Maximum number of outbound mapping window sizes that can be supported by any - * OARR/OMAP mapping pair - */ -#define MAX_NUM_OB_WINDOW_SIZES 4 - -#define OARR_VALID_SHIFT 0 -#define OARR_VALID BIT(OARR_VALID_SHIFT) -#define OARR_SIZE_CFG_SHIFT 1 - -/* - * Maximum number of inbound mapping region sizes that can be supported by an - * IARR - */ -#define MAX_NUM_IB_REGION_SIZES 9 - -#define IMAP_VALID_SHIFT 0 -#define IMAP_VALID BIT(IMAP_VALID_SHIFT) - -#define PCI_EXP_CAP 0xac - -#define IPROC_PCIE_REG_INVALID 0xffff - -/** - * iProc PCIe outbound mapping controller specific parameters - * - * @window_sizes: list of supported outbound mapping window sizes in MB - * @nr_sizes: number of supported outbound mapping window sizes - */ -struct iproc_pcie_ob_map { - resource_size_t window_sizes[MAX_NUM_OB_WINDOW_SIZES]; - unsigned int nr_sizes; -}; - -static const struct iproc_pcie_ob_map paxb_ob_map[] = { - { - /* OARR0/OMAP0 */ - .window_sizes = { 128, 256 }, - .nr_sizes = 2, - }, - { - /* OARR1/OMAP1 */ - .window_sizes = { 128, 256 }, - .nr_sizes = 2, - }, -}; - -static const struct iproc_pcie_ob_map paxb_v2_ob_map[] = { - { - /* OARR0/OMAP0 */ - .window_sizes = { 128, 256 }, - .nr_sizes = 2, - }, - { - /* OARR1/OMAP1 */ - .window_sizes = { 128, 256 }, - .nr_sizes = 2, - }, - { - /* OARR2/OMAP2 */ - .window_sizes = { 128, 256, 512, 1024 }, - .nr_sizes = 4, - }, - { - /* OARR3/OMAP3 */ - .window_sizes = { 128, 256, 512, 1024 }, - .nr_sizes = 4, - }, -}; - -/** - * iProc PCIe inbound mapping type - */ -enum iproc_pcie_ib_map_type { - /* for DDR memory */ - IPROC_PCIE_IB_MAP_MEM = 0, - - /* for device I/O memory */ - IPROC_PCIE_IB_MAP_IO, - - /* invalid or unused */ - IPROC_PCIE_IB_MAP_INVALID -}; - -/** - * iProc PCIe inbound mapping controller specific parameters - * - * @type: inbound mapping region type - * @size_unit: inbound mapping region size unit, could be SZ_1K, SZ_1M, or - * SZ_1G - * @region_sizes: list of supported inbound mapping region sizes in KB, MB, or - * GB, depedning on the size unit - * @nr_sizes: number of supported inbound mapping region sizes - * @nr_windows: number of supported inbound mapping windows for the region - * @imap_addr_offset: register offset between the upper and lower 32-bit - * IMAP address registers - * @imap_window_offset: register offset between each IMAP window - */ -struct iproc_pcie_ib_map { - enum iproc_pcie_ib_map_type type; - unsigned int size_unit; - resource_size_t region_sizes[MAX_NUM_IB_REGION_SIZES]; - unsigned int nr_sizes; - unsigned int nr_windows; - u16 imap_addr_offset; - u16 imap_window_offset; -}; - -static const struct iproc_pcie_ib_map paxb_v2_ib_map[] = { - { - /* IARR0/IMAP0 */ - .type = IPROC_PCIE_IB_MAP_IO, - .size_unit = SZ_1K, - .region_sizes = { 32 }, - .nr_sizes = 1, - .nr_windows = 8, - .imap_addr_offset = 0x40, - .imap_window_offset = 0x4, - }, - { - /* IARR1/IMAP1 (currently unused) */ - .type = IPROC_PCIE_IB_MAP_INVALID, - }, - { - /* IARR2/IMAP2 */ - .type = IPROC_PCIE_IB_MAP_MEM, - .size_unit = SZ_1M, - .region_sizes = { 64, 128, 256, 512, 1024, 2048, 4096, 8192, - 16384 }, - .nr_sizes = 9, - .nr_windows = 1, - .imap_addr_offset = 0x4, - .imap_window_offset = 0x8, - }, - { - /* IARR3/IMAP3 */ - .type = IPROC_PCIE_IB_MAP_MEM, - .size_unit = SZ_1G, - .region_sizes = { 1, 2, 4, 8, 16, 32 }, - .nr_sizes = 6, - .nr_windows = 8, - .imap_addr_offset = 0x4, - .imap_window_offset = 0x8, - }, - { - /* IARR4/IMAP4 */ - .type = IPROC_PCIE_IB_MAP_MEM, - .size_unit = SZ_1G, - .region_sizes = { 32, 64, 128, 256, 512 }, - .nr_sizes = 5, - .nr_windows = 8, - .imap_addr_offset = 0x4, - .imap_window_offset = 0x8, - }, -}; - -/* - * iProc PCIe host registers - */ -enum iproc_pcie_reg { - /* clock/reset signal control */ - IPROC_PCIE_CLK_CTRL = 0, - - /* - * To allow MSI to be steered to an external MSI controller (e.g., ARM - * GICv3 ITS) - */ - IPROC_PCIE_MSI_GIC_MODE, - - /* - * IPROC_PCIE_MSI_BASE_ADDR and IPROC_PCIE_MSI_WINDOW_SIZE define the - * window where the MSI posted writes are written, for the writes to be - * interpreted as MSI writes. - */ - IPROC_PCIE_MSI_BASE_ADDR, - IPROC_PCIE_MSI_WINDOW_SIZE, - - /* - * To hold the address of the register where the MSI writes are - * programed. When ARM GICv3 ITS is used, this should be programmed - * with the address of the GITS_TRANSLATER register. - */ - IPROC_PCIE_MSI_ADDR_LO, - IPROC_PCIE_MSI_ADDR_HI, - - /* enable MSI */ - IPROC_PCIE_MSI_EN_CFG, - - /* allow access to root complex configuration space */ - IPROC_PCIE_CFG_IND_ADDR, - IPROC_PCIE_CFG_IND_DATA, - - /* allow access to device configuration space */ - IPROC_PCIE_CFG_ADDR, - IPROC_PCIE_CFG_DATA, - - /* enable INTx */ - IPROC_PCIE_INTX_EN, - - /* outbound address mapping */ - IPROC_PCIE_OARR0, - IPROC_PCIE_OMAP0, - IPROC_PCIE_OARR1, - IPROC_PCIE_OMAP1, - IPROC_PCIE_OARR2, - IPROC_PCIE_OMAP2, - IPROC_PCIE_OARR3, - IPROC_PCIE_OMAP3, - - /* inbound address mapping */ - IPROC_PCIE_IARR0, - IPROC_PCIE_IMAP0, - IPROC_PCIE_IARR1, - IPROC_PCIE_IMAP1, - IPROC_PCIE_IARR2, - IPROC_PCIE_IMAP2, - IPROC_PCIE_IARR3, - IPROC_PCIE_IMAP3, - IPROC_PCIE_IARR4, - IPROC_PCIE_IMAP4, - - /* link status */ - IPROC_PCIE_LINK_STATUS, - - /* enable APB error for unsupported requests */ - IPROC_PCIE_APB_ERR_EN, - - /* total number of core registers */ - IPROC_PCIE_MAX_NUM_REG, -}; - -/* iProc PCIe PAXB BCMA registers */ -static const u16 iproc_pcie_reg_paxb_bcma[] = { - [IPROC_PCIE_CLK_CTRL] = 0x000, - [IPROC_PCIE_CFG_IND_ADDR] = 0x120, - [IPROC_PCIE_CFG_IND_DATA] = 0x124, - [IPROC_PCIE_CFG_ADDR] = 0x1f8, - [IPROC_PCIE_CFG_DATA] = 0x1fc, - [IPROC_PCIE_INTX_EN] = 0x330, - [IPROC_PCIE_LINK_STATUS] = 0xf0c, -}; - -/* iProc PCIe PAXB registers */ -static const u16 iproc_pcie_reg_paxb[] = { - [IPROC_PCIE_CLK_CTRL] = 0x000, - [IPROC_PCIE_CFG_IND_ADDR] = 0x120, - [IPROC_PCIE_CFG_IND_DATA] = 0x124, - [IPROC_PCIE_CFG_ADDR] = 0x1f8, - [IPROC_PCIE_CFG_DATA] = 0x1fc, - [IPROC_PCIE_INTX_EN] = 0x330, - [IPROC_PCIE_OARR0] = 0xd20, - [IPROC_PCIE_OMAP0] = 0xd40, - [IPROC_PCIE_OARR1] = 0xd28, - [IPROC_PCIE_OMAP1] = 0xd48, - [IPROC_PCIE_LINK_STATUS] = 0xf0c, - [IPROC_PCIE_APB_ERR_EN] = 0xf40, -}; - -/* iProc PCIe PAXB v2 registers */ -static const u16 iproc_pcie_reg_paxb_v2[] = { - [IPROC_PCIE_CLK_CTRL] = 0x000, - [IPROC_PCIE_CFG_IND_ADDR] = 0x120, - [IPROC_PCIE_CFG_IND_DATA] = 0x124, - [IPROC_PCIE_CFG_ADDR] = 0x1f8, - [IPROC_PCIE_CFG_DATA] = 0x1fc, - [IPROC_PCIE_INTX_EN] = 0x330, - [IPROC_PCIE_OARR0] = 0xd20, - [IPROC_PCIE_OMAP0] = 0xd40, - [IPROC_PCIE_OARR1] = 0xd28, - [IPROC_PCIE_OMAP1] = 0xd48, - [IPROC_PCIE_OARR2] = 0xd60, - [IPROC_PCIE_OMAP2] = 0xd68, - [IPROC_PCIE_OARR3] = 0xdf0, - [IPROC_PCIE_OMAP3] = 0xdf8, - [IPROC_PCIE_IARR0] = 0xd00, - [IPROC_PCIE_IMAP0] = 0xc00, - [IPROC_PCIE_IARR2] = 0xd10, - [IPROC_PCIE_IMAP2] = 0xcc0, - [IPROC_PCIE_IARR3] = 0xe00, - [IPROC_PCIE_IMAP3] = 0xe08, - [IPROC_PCIE_IARR4] = 0xe68, - [IPROC_PCIE_IMAP4] = 0xe70, - [IPROC_PCIE_LINK_STATUS] = 0xf0c, - [IPROC_PCIE_APB_ERR_EN] = 0xf40, -}; - -/* iProc PCIe PAXC v1 registers */ -static const u16 iproc_pcie_reg_paxc[] = { - [IPROC_PCIE_CLK_CTRL] = 0x000, - [IPROC_PCIE_CFG_IND_ADDR] = 0x1f0, - [IPROC_PCIE_CFG_IND_DATA] = 0x1f4, - [IPROC_PCIE_CFG_ADDR] = 0x1f8, - [IPROC_PCIE_CFG_DATA] = 0x1fc, -}; - -/* iProc PCIe PAXC v2 registers */ -static const u16 iproc_pcie_reg_paxc_v2[] = { - [IPROC_PCIE_MSI_GIC_MODE] = 0x050, - [IPROC_PCIE_MSI_BASE_ADDR] = 0x074, - [IPROC_PCIE_MSI_WINDOW_SIZE] = 0x078, - [IPROC_PCIE_MSI_ADDR_LO] = 0x07c, - [IPROC_PCIE_MSI_ADDR_HI] = 0x080, - [IPROC_PCIE_MSI_EN_CFG] = 0x09c, - [IPROC_PCIE_CFG_IND_ADDR] = 0x1f0, - [IPROC_PCIE_CFG_IND_DATA] = 0x1f4, - [IPROC_PCIE_CFG_ADDR] = 0x1f8, - [IPROC_PCIE_CFG_DATA] = 0x1fc, -}; - -static inline struct iproc_pcie *iproc_data(struct pci_bus *bus) -{ - struct iproc_pcie *pcie; -#ifdef CONFIG_ARM - struct pci_sys_data *sys = bus->sysdata; - - pcie = sys->private_data; -#else - pcie = bus->sysdata; -#endif - return pcie; -} - -static inline bool iproc_pcie_reg_is_invalid(u16 reg_offset) -{ - return !!(reg_offset == IPROC_PCIE_REG_INVALID); -} - -static inline u16 iproc_pcie_reg_offset(struct iproc_pcie *pcie, - enum iproc_pcie_reg reg) -{ - return pcie->reg_offsets[reg]; -} - -static inline u32 iproc_pcie_read_reg(struct iproc_pcie *pcie, - enum iproc_pcie_reg reg) -{ - u16 offset = iproc_pcie_reg_offset(pcie, reg); - - if (iproc_pcie_reg_is_invalid(offset)) - return 0; - - return readl(pcie->base + offset); -} - -static inline void iproc_pcie_write_reg(struct iproc_pcie *pcie, - enum iproc_pcie_reg reg, u32 val) -{ - u16 offset = iproc_pcie_reg_offset(pcie, reg); - - if (iproc_pcie_reg_is_invalid(offset)) - return; - - writel(val, pcie->base + offset); -} - -/** - * APB error forwarding can be disabled during access of configuration - * registers of the endpoint device, to prevent unsupported requests - * (typically seen during enumeration with multi-function devices) from - * triggering a system exception. - */ -static inline void iproc_pcie_apb_err_disable(struct pci_bus *bus, - bool disable) -{ - struct iproc_pcie *pcie = iproc_data(bus); - u32 val; - - if (bus->number && pcie->has_apb_err_disable) { - val = iproc_pcie_read_reg(pcie, IPROC_PCIE_APB_ERR_EN); - if (disable) - val &= ~APB_ERR_EN; - else - val |= APB_ERR_EN; - iproc_pcie_write_reg(pcie, IPROC_PCIE_APB_ERR_EN, val); - } -} - -/** - * Note access to the configuration registers are protected at the higher layer - * by 'pci_lock' in drivers/pci/access.c - */ -static void __iomem *iproc_pcie_map_cfg_bus(struct iproc_pcie *pcie, - int busno, - unsigned int devfn, - int where) -{ - unsigned slot = PCI_SLOT(devfn); - unsigned fn = PCI_FUNC(devfn); - u32 val; - u16 offset; - - /* root complex access */ - if (busno == 0) { - if (slot > 0 || fn > 0) - return NULL; - - iproc_pcie_write_reg(pcie, IPROC_PCIE_CFG_IND_ADDR, - where & CFG_IND_ADDR_MASK); - offset = iproc_pcie_reg_offset(pcie, IPROC_PCIE_CFG_IND_DATA); - if (iproc_pcie_reg_is_invalid(offset)) - return NULL; - else - return (pcie->base + offset); - } - - /* - * PAXC is connected to an internally emulated EP within the SoC. It - * allows only one device. - */ - if (pcie->ep_is_internal) - if (slot > 0) - return NULL; - - /* EP device access */ - val = (busno << CFG_ADDR_BUS_NUM_SHIFT) | - (slot << CFG_ADDR_DEV_NUM_SHIFT) | - (fn << CFG_ADDR_FUNC_NUM_SHIFT) | - (where & CFG_ADDR_REG_NUM_MASK) | - (1 & CFG_ADDR_CFG_TYPE_MASK); - iproc_pcie_write_reg(pcie, IPROC_PCIE_CFG_ADDR, val); - offset = iproc_pcie_reg_offset(pcie, IPROC_PCIE_CFG_DATA); - if (iproc_pcie_reg_is_invalid(offset)) - return NULL; - else - return (pcie->base + offset); -} - -static void __iomem *iproc_pcie_bus_map_cfg_bus(struct pci_bus *bus, - unsigned int devfn, - int where) -{ - return iproc_pcie_map_cfg_bus(iproc_data(bus), bus->number, devfn, - where); -} - -static int iproc_pci_raw_config_read32(struct iproc_pcie *pcie, - unsigned int devfn, int where, - int size, u32 *val) -{ - void __iomem *addr; - - addr = iproc_pcie_map_cfg_bus(pcie, 0, devfn, where & ~0x3); - if (!addr) { - *val = ~0; - return PCIBIOS_DEVICE_NOT_FOUND; - } - - *val = readl(addr); - - if (size <= 2) - *val = (*val >> (8 * (where & 3))) & ((1 << (size * 8)) - 1); - - return PCIBIOS_SUCCESSFUL; -} - -static int iproc_pci_raw_config_write32(struct iproc_pcie *pcie, - unsigned int devfn, int where, - int size, u32 val) -{ - void __iomem *addr; - u32 mask, tmp; - - addr = iproc_pcie_map_cfg_bus(pcie, 0, devfn, where & ~0x3); - if (!addr) - return PCIBIOS_DEVICE_NOT_FOUND; - - if (size == 4) { - writel(val, addr); - return PCIBIOS_SUCCESSFUL; - } - - mask = ~(((1 << (size * 8)) - 1) << ((where & 0x3) * 8)); - tmp = readl(addr) & mask; - tmp |= val << ((where & 0x3) * 8); - writel(tmp, addr); - - return PCIBIOS_SUCCESSFUL; -} - -static int iproc_pcie_config_read32(struct pci_bus *bus, unsigned int devfn, - int where, int size, u32 *val) -{ - int ret; - - iproc_pcie_apb_err_disable(bus, true); - ret = pci_generic_config_read32(bus, devfn, where, size, val); - iproc_pcie_apb_err_disable(bus, false); - - return ret; -} - -static int iproc_pcie_config_write32(struct pci_bus *bus, unsigned int devfn, - int where, int size, u32 val) -{ - int ret; - - iproc_pcie_apb_err_disable(bus, true); - ret = pci_generic_config_write32(bus, devfn, where, size, val); - iproc_pcie_apb_err_disable(bus, false); - - return ret; -} - -static struct pci_ops iproc_pcie_ops = { - .map_bus = iproc_pcie_bus_map_cfg_bus, - .read = iproc_pcie_config_read32, - .write = iproc_pcie_config_write32, -}; - -static void iproc_pcie_reset(struct iproc_pcie *pcie) -{ - u32 val; - - /* - * PAXC and the internal emulated endpoint device downstream should not - * be reset. If firmware has been loaded on the endpoint device at an - * earlier boot stage, reset here causes issues. - */ - if (pcie->ep_is_internal) - return; - - /* - * Select perst_b signal as reset source. Put the device into reset, - * and then bring it out of reset - */ - val = iproc_pcie_read_reg(pcie, IPROC_PCIE_CLK_CTRL); - val &= ~EP_PERST_SOURCE_SELECT & ~EP_MODE_SURVIVE_PERST & - ~RC_PCIE_RST_OUTPUT; - iproc_pcie_write_reg(pcie, IPROC_PCIE_CLK_CTRL, val); - udelay(250); - - val |= RC_PCIE_RST_OUTPUT; - iproc_pcie_write_reg(pcie, IPROC_PCIE_CLK_CTRL, val); - msleep(100); -} - -static int iproc_pcie_check_link(struct iproc_pcie *pcie) -{ - struct device *dev = pcie->dev; - u32 hdr_type, link_ctrl, link_status, class, val; - u16 pos = PCI_EXP_CAP; - bool link_is_active = false; - - /* - * PAXC connects to emulated endpoint devices directly and does not - * have a Serdes. Therefore skip the link detection logic here. - */ - if (pcie->ep_is_internal) - return 0; - - val = iproc_pcie_read_reg(pcie, IPROC_PCIE_LINK_STATUS); - if (!(val & PCIE_PHYLINKUP) || !(val & PCIE_DL_ACTIVE)) { - dev_err(dev, "PHY or data link is INACTIVE!\n"); - return -ENODEV; - } - - /* make sure we are not in EP mode */ - iproc_pci_raw_config_read32(pcie, 0, PCI_HEADER_TYPE, 1, &hdr_type); - if ((hdr_type & 0x7f) != PCI_HEADER_TYPE_BRIDGE) { - dev_err(dev, "in EP mode, hdr=%#02x\n", hdr_type); - return -EFAULT; - } - - /* force class to PCI_CLASS_BRIDGE_PCI (0x0604) */ -#define PCI_BRIDGE_CTRL_REG_OFFSET 0x43c -#define PCI_CLASS_BRIDGE_MASK 0xffff00 -#define PCI_CLASS_BRIDGE_SHIFT 8 - iproc_pci_raw_config_read32(pcie, 0, PCI_BRIDGE_CTRL_REG_OFFSET, - 4, &class); - class &= ~PCI_CLASS_BRIDGE_MASK; - class |= (PCI_CLASS_BRIDGE_PCI << PCI_CLASS_BRIDGE_SHIFT); - iproc_pci_raw_config_write32(pcie, 0, PCI_BRIDGE_CTRL_REG_OFFSET, - 4, class); - - /* check link status to see if link is active */ - iproc_pci_raw_config_read32(pcie, 0, pos + PCI_EXP_LNKSTA, - 2, &link_status); - if (link_status & PCI_EXP_LNKSTA_NLW) - link_is_active = true; - - if (!link_is_active) { - /* try GEN 1 link speed */ -#define PCI_TARGET_LINK_SPEED_MASK 0xf -#define PCI_TARGET_LINK_SPEED_GEN2 0x2 -#define PCI_TARGET_LINK_SPEED_GEN1 0x1 - iproc_pci_raw_config_read32(pcie, 0, - pos + PCI_EXP_LNKCTL2, 4, - &link_ctrl); - if ((link_ctrl & PCI_TARGET_LINK_SPEED_MASK) == - PCI_TARGET_LINK_SPEED_GEN2) { - link_ctrl &= ~PCI_TARGET_LINK_SPEED_MASK; - link_ctrl |= PCI_TARGET_LINK_SPEED_GEN1; - iproc_pci_raw_config_write32(pcie, 0, - pos + PCI_EXP_LNKCTL2, - 4, link_ctrl); - msleep(100); - - iproc_pci_raw_config_read32(pcie, 0, - pos + PCI_EXP_LNKSTA, - 2, &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 inline bool iproc_pcie_ib_is_in_use(struct iproc_pcie *pcie, - int region_idx) -{ - const struct iproc_pcie_ib_map *ib_map = &pcie->ib_map[region_idx]; - u32 val; - - val = iproc_pcie_read_reg(pcie, MAP_REG(IPROC_PCIE_IARR0, region_idx)); - - return !!(val & (BIT(ib_map->nr_sizes) - 1)); -} - -static inline bool iproc_pcie_ib_check_type(const struct iproc_pcie_ib_map *ib_map, - enum iproc_pcie_ib_map_type type) -{ - return !!(ib_map->type == type); -} - -static int iproc_pcie_ib_write(struct iproc_pcie *pcie, int region_idx, - int size_idx, int nr_windows, u64 axi_addr, - u64 pci_addr, resource_size_t size) -{ - struct device *dev = pcie->dev; - const struct iproc_pcie_ib_map *ib_map = &pcie->ib_map[region_idx]; - u16 iarr_offset, imap_offset; - u32 val; - int window_idx; - - iarr_offset = iproc_pcie_reg_offset(pcie, - MAP_REG(IPROC_PCIE_IARR0, region_idx)); - imap_offset = iproc_pcie_reg_offset(pcie, - MAP_REG(IPROC_PCIE_IMAP0, region_idx)); - if (iproc_pcie_reg_is_invalid(iarr_offset) || - iproc_pcie_reg_is_invalid(imap_offset)) - return -EINVAL; - - dev_info(dev, "ib region [%d]: offset 0x%x axi %pap pci %pap\n", - region_idx, iarr_offset, &axi_addr, &pci_addr); - - /* - * Program the IARR registers. The upper 32-bit IARR register is - * always right after the lower 32-bit IARR register. - */ - writel(lower_32_bits(pci_addr) | BIT(size_idx), - pcie->base + iarr_offset); - writel(upper_32_bits(pci_addr), pcie->base + iarr_offset + 4); - - dev_info(dev, "iarr lo 0x%x iarr hi 0x%x\n", - readl(pcie->base + iarr_offset), - readl(pcie->base + iarr_offset + 4)); - - /* - * Now program the IMAP registers. Each IARR region may have one or - * more IMAP windows. - */ - size >>= ilog2(nr_windows); - for (window_idx = 0; window_idx < nr_windows; window_idx++) { - val = readl(pcie->base + imap_offset); - val |= lower_32_bits(axi_addr) | IMAP_VALID; - writel(val, pcie->base + imap_offset); - writel(upper_32_bits(axi_addr), - pcie->base + imap_offset + ib_map->imap_addr_offset); - - dev_info(dev, "imap window [%d] lo 0x%x hi 0x%x\n", - window_idx, readl(pcie->base + imap_offset), - readl(pcie->base + imap_offset + - ib_map->imap_addr_offset)); - - imap_offset += ib_map->imap_window_offset; - axi_addr += size; - } - - return 0; -} - -static int iproc_pcie_setup_ib(struct iproc_pcie *pcie, - struct of_pci_range *range, - enum iproc_pcie_ib_map_type type) -{ - struct device *dev = pcie->dev; - struct iproc_pcie_ib *ib = &pcie->ib; - int ret; - unsigned int region_idx, size_idx; - u64 axi_addr = range->cpu_addr, pci_addr = range->pci_addr; - resource_size_t size = range->size; - - /* iterate through all IARR mapping regions */ - for (region_idx = 0; region_idx < ib->nr_regions; region_idx++) { - const struct iproc_pcie_ib_map *ib_map = - &pcie->ib_map[region_idx]; - - /* - * If current inbound region is already in use or not a - * compatible type, move on to the next. - */ - if (iproc_pcie_ib_is_in_use(pcie, region_idx) || - !iproc_pcie_ib_check_type(ib_map, type)) - continue; - - /* iterate through all supported region sizes to find a match */ - for (size_idx = 0; size_idx < ib_map->nr_sizes; size_idx++) { - resource_size_t region_size = - ib_map->region_sizes[size_idx] * ib_map->size_unit; - - if (size != region_size) - continue; - - if (!IS_ALIGNED(axi_addr, region_size) || - !IS_ALIGNED(pci_addr, region_size)) { - dev_err(dev, - "axi %pap or pci %pap not aligned\n", - &axi_addr, &pci_addr); - return -EINVAL; - } - - /* Match found! Program IARR and all IMAP windows. */ - ret = iproc_pcie_ib_write(pcie, region_idx, size_idx, - ib_map->nr_windows, axi_addr, - pci_addr, size); - if (ret) - goto err_ib; - else - return 0; - - } - } - ret = -EINVAL; - -err_ib: - dev_err(dev, "unable to configure inbound mapping\n"); - dev_err(dev, "axi %pap, pci %pap, res size %pap\n", - &axi_addr, &pci_addr, &size); - - return ret; -} - -static int pci_dma_range_parser_init(struct of_pci_range_parser *parser, - struct device_node *node) -{ - const int na = 3, ns = 2; - int rlen; - - parser->node = node; - parser->pna = of_n_addr_cells(node); - parser->np = parser->pna + na + ns; - - parser->range = of_get_property(node, "dma-ranges", &rlen); - if (!parser->range) - return -ENOENT; - - parser->end = parser->range + rlen / sizeof(__be32); - return 0; -} - -static int iproc_pcie_map_dma_ranges(struct iproc_pcie *pcie) -{ - struct of_pci_range range; - struct of_pci_range_parser parser; - int ret; - - /* Get the dma-ranges from DT */ - ret = pci_dma_range_parser_init(&parser, pcie->dev->of_node); - if (ret) - return ret; - - for_each_of_pci_range(&parser, &range) { - /* Each range entry corresponds to an inbound mapping region */ - ret = iproc_pcie_setup_ib(pcie, &range, IPROC_PCIE_IB_MAP_MEM); - if (ret) - return ret; - } - - 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 int iproc_pcie_paxb_v2_msi_steer(struct iproc_pcie *pcie, u64 msi_addr) -{ - int ret; - struct of_pci_range range; - - memset(&range, 0, sizeof(range)); - range.size = SZ_32K; - range.pci_addr = range.cpu_addr = msi_addr & ~(range.size - 1); - - ret = iproc_pcie_setup_ib(pcie, &range, IPROC_PCIE_IB_MAP_IO); - return ret; -} - -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_PAXB_V2: - ret = iproc_pcie_paxb_v2_msi_steer(pcie, msi_addr); - if (ret) - return ret; - break; - 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_PAXB_V2: - regs = iproc_pcie_reg_paxb_v2; - pcie->has_apb_err_disable = true; - if (pcie->need_ob_cfg) { - pcie->ob_map = paxb_v2_ob_map; - pcie->ob.nr_windows = ARRAY_SIZE(paxb_v2_ob_map); - } - pcie->ib.nr_regions = ARRAY_SIZE(paxb_v2_ib_map); - pcie->ib_map = paxb_v2_ib_map; - pcie->need_msi_steer = true; - 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 *child; - struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie); - - 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; - } - } - - ret = iproc_pcie_map_dma_ranges(pcie); - if (ret && ret != -ENOENT) - goto err_power_off_phy; - -#ifdef CONFIG_ARM - pcie->sysdata.private_data = pcie; - sysdata = &pcie->sysdata; -#else - sysdata = pcie; -#endif - - ret = iproc_pcie_check_link(pcie); - if (ret) { - dev_err(dev, "no PCIe EP device detected\n"); - goto err_power_off_phy; - } - - iproc_pcie_enable(pcie); - - if (IS_ENABLED(CONFIG_PCI_MSI)) - if (iproc_pcie_msi_enable(pcie)) - dev_info(dev, "not using iProc MSI\n"); - - list_splice_init(res, &host->windows); - host->busnr = 0; - host->dev.parent = dev; - host->ops = &iproc_pcie_ops; - host->sysdata = sysdata; - host->map_irq = pcie->map_irq; - host->swizzle_irq = pci_common_swizzle; - - ret = pci_scan_root_bus_bridge(host); - if (ret < 0) { - dev_err(dev, "failed to scan host: %d\n", ret); - goto err_power_off_phy; - } - - pci_assign_unassigned_bus_resources(host->bus); - - pcie->root_bus = host->bus; - - list_for_each_entry(child, &host->bus->children, node) - pcie_bus_configure_settings(child); - - pci_bus_add_devices(host->bus); - - return 0; - -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"); |