[U-Boot] [PATCH 4/4] driver/pci: add Layerscape PCIe driver
Minghuan Lian
Minghuan.Lian at freescale.com
Wed Jan 21 10:29:20 CET 2015
The patch adds Freescale Layerscape PCIe driver and provides
up to 4 controllers support.
Signed-off-by: Minghuan Lian <Minghuan.Lian at freescale.com>
---
drivers/pci/pcie_layerscape.c | 471 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 466 insertions(+), 5 deletions(-)
diff --git a/drivers/pci/pcie_layerscape.c b/drivers/pci/pcie_layerscape.c
index 291c249..bcad8f2 100644
--- a/drivers/pci/pcie_layerscape.c
+++ b/drivers/pci/pcie_layerscape.c
@@ -1,5 +1,5 @@
/*
- * Copyright 2014 Freescale Semiconductor, Inc.
+ * Copyright 2014-2015 Freescale Semiconductor, Inc.
* Layerscape PCIe driver
*
* SPDX-License-Identifier: GPL-2.0+
@@ -9,8 +9,465 @@
#include <asm/arch/fsl_serdes.h>
#include <pci.h>
#include <asm/io.h>
+#include <errno.h>
+#include <malloc.h>
#include <asm/pcie_layerscape.h>
+#ifndef CONFIG_SYS_PCI_MEMORY_BUS
+#define CONFIG_SYS_PCI_MEMORY_BUS CONFIG_SYS_SDRAM_BASE
+#endif
+
+#ifndef CONFIG_SYS_PCI_MEMORY_PHYS
+#define CONFIG_SYS_PCI_MEMORY_PHYS CONFIG_SYS_SDRAM_BASE
+#endif
+
+#ifndef CONFIG_SYS_PCI_MEMORY_SIZE
+#define CONFIG_SYS_PCI_MEMORY_SIZE (2 * 1024 * 1024 * 1024UL) /* 2G */
+#endif
+
+/* iATU registers */
+#define PCIE_ATU_VIEWPORT 0x900
+#define PCIE_ATU_REGION_INBOUND (0x1 << 31)
+#define PCIE_ATU_REGION_OUTBOUND (0x0 << 31)
+#define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
+#define PCIE_ATU_REGION_INDEX1 (0x1 << 0)
+#define PCIE_ATU_REGION_INDEX2 (0x2 << 0)
+#define PCIE_ATU_REGION_INDEX3 (0x3 << 0)
+#define PCIE_ATU_CR1 0x904
+#define PCIE_ATU_TYPE_MEM (0x0 << 0)
+#define PCIE_ATU_TYPE_IO (0x2 << 0)
+#define PCIE_ATU_TYPE_CFG0 (0x4 << 0)
+#define PCIE_ATU_TYPE_CFG1 (0x5 << 0)
+#define PCIE_ATU_CR2 0x908
+#define PCIE_ATU_ENABLE (0x1 << 31)
+#define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30)
+#define PCIE_ATU_LOWER_BASE 0x90C
+#define PCIE_ATU_UPPER_BASE 0x910
+#define PCIE_ATU_LIMIT 0x914
+#define PCIE_ATU_LOWER_TARGET 0x918
+#define PCIE_ATU_BUS(x) (((x) & 0xff) << 24)
+#define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19)
+#define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
+#define PCIE_ATU_UPPER_TARGET 0x91C
+
+#define PCIE_LINK_CAP 0x7c
+#define PCIE_LINK_SPEED_MASK 0xf
+#define PCIE_LINK_STA 0x82
+
+#define PCIE_DBI_SIZE (4 * 1024) /* 4K */
+
+struct ls_pcie {
+ int idx;
+ void __iomem *dbi;
+ void __iomem *va_cfg0;
+ void __iomem *va_cfg1;
+ struct pci_controller hose;
+};
+
+struct ls_pcie_info {
+ unsigned long regs;
+ int pci_num;
+ u64 cfg0_phys;
+ u64 cfg0_size;
+ u64 cfg1_phys;
+ u64 cfg1_size;
+ u64 mem_bus;
+ u64 mem_phys;
+ u64 mem_size;
+ u64 io_bus;
+ u64 io_phys;
+ u64 io_size;
+};
+
+#define SET_LS_PCIE_INFO(x, num) \
+{ \
+ x.regs = CONFIG_SYS_PCIE##num##_ADDR; \
+ x.cfg0_phys = CONFIG_SYS_PCIE_CFG0_PHYS_OFF + \
+ CONFIG_SYS_PCIE##num##_PHYS_ADDR; \
+ x.cfg0_size = CONFIG_SYS_PCIE_CFG0_SIZE; \
+ x.cfg1_phys = CONFIG_SYS_PCIE_CFG1_PHYS_OFF + \
+ CONFIG_SYS_PCIE##num##_PHYS_ADDR; \
+ x.cfg1_size = CONFIG_SYS_PCIE_CFG1_SIZE; \
+ x.mem_bus = CONFIG_SYS_PCIE_MEM_BUS; \
+ x.mem_phys = CONFIG_SYS_PCIE_MEM_PHYS_OFF + \
+ CONFIG_SYS_PCIE##num##_PHYS_ADDR; \
+ x.mem_size = CONFIG_SYS_PCIE_MEM_SIZE; \
+ x.io_bus = CONFIG_SYS_PCIE_IO_BUS; \
+ x.io_phys = CONFIG_SYS_PCIE_IO_PHYS_OFF + \
+ CONFIG_SYS_PCIE##num##_PHYS_ADDR; \
+ x.io_size = CONFIG_SYS_PCIE_IO_SIZE; \
+ x.pci_num = num; \
+}
+
+#ifdef CONFIG_LS102XA
+#include <asm/arch/immap_ls102xa.h>
+
+/* PEX1/2 Misc Ports Status Register */
+#define LTSSM_STATE_SHIFT 20
+#define LTSSM_STATE_MASK 0x3f
+#define LTSSM_PCIE_L0 0x11 /* L0 state */
+
+static int ls_pcie_link_state(struct ls_pcie *pcie)
+{
+ u32 state;
+ struct ccsr_scfg *scfg = (struct ccsr_scfg *)CONFIG_SYS_FSL_SCFG_ADDR;
+
+ state = in_be32(&scfg->pexmscportsr[pcie->idx]);
+ state = (state >> LTSSM_STATE_SHIFT) & LTSSM_STATE_MASK;
+ if (state < LTSSM_PCIE_L0) {
+ debug("....PCIe link error. LTSSM=0x%02x.\n", state);
+ return 0;
+ }
+
+ return 1;
+}
+#else
+#define PCIE_LDBG 0x7FC
+
+static int ls_pcie_link_state(struct ls_pcie *pcie)
+{
+ u32 state;
+
+ state = readl(pcie->dbi + PCIE_LDBG);
+ if (state)
+ return 1;
+
+ debug("....PCIe link error.\n");
+ return 0;
+}
+#endif
+
+static int ls_pcie_link_up(struct ls_pcie *pcie)
+{
+ int state;
+ u32 cap;
+
+ state = ls_pcie_link_state(pcie);
+ if (state)
+ return state;
+
+ /* Try to download speed to gen1 */
+ cap = readl(pcie->dbi + PCIE_LINK_CAP);
+ writel((cap & (~PCIE_LINK_SPEED_MASK)) | 1, pcie->dbi + PCIE_LINK_CAP);
+ udelay(2000);
+ state = ls_pcie_link_state(pcie);
+ if (state)
+ return state;
+
+ writel(cap, pcie->dbi + PCIE_LINK_CAP);
+
+ return 0;
+}
+
+static void ls_pcie_cfg0_set_busdev(struct ls_pcie *pcie, u32 busdev)
+{
+ writel(PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0,
+ pcie->dbi + PCIE_ATU_VIEWPORT);
+ writel(busdev, pcie->dbi + PCIE_ATU_LOWER_TARGET);
+}
+
+static void ls_pcie_cfg1_set_busdev(struct ls_pcie *pcie, u32 busdev)
+{
+ writel(PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1,
+ pcie->dbi + PCIE_ATU_VIEWPORT);
+ writel(busdev, pcie->dbi + PCIE_ATU_LOWER_TARGET);
+}
+
+static void ls_pcie_iatu_outbound_set(struct ls_pcie *pcie, int idx, int type,
+ u64 phys, u64 bus_addr, pci_size_t size)
+{
+ writel(PCIE_ATU_REGION_OUTBOUND | idx, pcie->dbi + PCIE_ATU_VIEWPORT);
+ writel((u32)phys, pcie->dbi + PCIE_ATU_LOWER_BASE);
+ writel(phys >> 32, pcie->dbi + PCIE_ATU_UPPER_BASE);
+ writel(phys + size - 1, pcie->dbi + PCIE_ATU_LIMIT);
+ writel((u32)bus_addr, pcie->dbi + PCIE_ATU_LOWER_TARGET);
+ writel(bus_addr >> 32, pcie->dbi + PCIE_ATU_UPPER_TARGET);
+ writel(type, pcie->dbi + PCIE_ATU_CR1);
+ writel(PCIE_ATU_ENABLE, pcie->dbi + PCIE_ATU_CR2);
+}
+
+static void ls_pcie_setup_atu(struct ls_pcie *pcie, struct ls_pcie_info *info)
+{
+#ifdef DEBUG
+ int i;
+#endif
+
+ /* ATU 0 : OUTBOUND : CFG0 */
+ ls_pcie_iatu_outbound_set(pcie, PCIE_ATU_REGION_INDEX0,
+ PCIE_ATU_TYPE_CFG0,
+ info->cfg0_phys,
+ 0,
+ info->cfg0_size);
+ /* ATU 1 : OUTBOUND : CFG1 */
+ ls_pcie_iatu_outbound_set(pcie, PCIE_ATU_REGION_INDEX1,
+ PCIE_ATU_TYPE_CFG1,
+ info->cfg1_phys,
+ 0,
+ info->cfg1_size);
+ /* ATU 2 : OUTBOUND : MEM */
+ ls_pcie_iatu_outbound_set(pcie, PCIE_ATU_REGION_INDEX2,
+ PCIE_ATU_TYPE_MEM,
+ info->mem_phys,
+ info->mem_bus,
+ info->mem_size);
+ /* ATU 3 : OUTBOUND : IO */
+ ls_pcie_iatu_outbound_set(pcie, PCIE_ATU_REGION_INDEX3,
+ PCIE_ATU_TYPE_IO,
+ info->io_phys,
+ info->io_bus,
+ info->io_size);
+
+#ifdef DEBUG
+ for (i = 0; i <= PCIE_ATU_REGION_INDEX3; i++) {
+ writel(PCIE_ATU_REGION_OUTBOUND | i,
+ pcie->dbi + PCIE_ATU_VIEWPORT);
+ debug("iATU%d:\n", i);
+ debug("\tLOWER PHYS 0x%08x\n",
+ readl(pcie->dbi + PCIE_ATU_LOWER_BASE));
+ debug("\tUPPER PHYS 0x%08x\n",
+ readl(pcie->dbi + PCIE_ATU_UPPER_BASE));
+ debug("\tLOWER BUS 0x%08x\n",
+ readl(pcie->dbi + PCIE_ATU_LOWER_TARGET));
+ debug("\tUPPER BUS 0x%08x\n",
+ readl(pcie->dbi + PCIE_ATU_UPPER_TARGET));
+ debug("\tLIMIT 0x%08x\n",
+ readl(pcie->dbi + PCIE_ATU_LIMIT));
+ debug("\tCR1 0x%08x\n",
+ readl(pcie->dbi + PCIE_ATU_CR1));
+ debug("\tCR2 0x%08x\n",
+ readl(pcie->dbi + PCIE_ATU_CR2));
+ }
+#endif
+}
+
+int pci_skip_dev(struct pci_controller *hose, pci_dev_t dev)
+{
+ /* Do not skip controller */
+ return 0;
+}
+
+static int ls_pcie_addr_valid(struct pci_controller *hose, pci_dev_t d)
+{
+ if (PCI_DEV(d) > 0)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int ls_pcie_read_config(struct pci_controller *hose, pci_dev_t d,
+ int where, u32 *val)
+{
+ struct ls_pcie *pcie = hose->priv_data;
+ u32 busdev, *addr;
+
+ if (ls_pcie_addr_valid(hose, d)) {
+ *val = 0xffffffff;
+ return -EINVAL;
+ }
+
+ if (PCI_BUS(d) == hose->first_busno) {
+ addr = pcie->dbi + (where & ~0x3);
+ } else {
+ busdev = PCIE_ATU_BUS(PCI_BUS(d)) |
+ PCIE_ATU_DEV(PCI_DEV(d)) |
+ PCIE_ATU_FUNC(PCI_FUNC(d));
+
+ if (PCI_BUS(d) == hose->first_busno + 1) {
+ ls_pcie_cfg0_set_busdev(pcie, busdev);
+ addr = pcie->va_cfg0 + (where & ~0x3);
+ } else {
+ ls_pcie_cfg1_set_busdev(pcie, busdev);
+ addr = pcie->va_cfg1 + (where & ~0x3);
+ }
+ }
+
+ *val = readl(addr);
+
+ return 0;
+}
+
+static int ls_pcie_write_config(struct pci_controller *hose, pci_dev_t d,
+ int where, u32 val)
+{
+ struct ls_pcie *pcie = hose->priv_data;
+ u32 busdev, *addr;
+
+ if (ls_pcie_addr_valid(hose, d))
+ return -EINVAL;
+
+ if (PCI_BUS(d) == hose->first_busno) {
+ addr = pcie->dbi + (where & ~0x3);
+ } else {
+ busdev = PCIE_ATU_BUS(PCI_BUS(d)) |
+ PCIE_ATU_DEV(PCI_DEV(d)) |
+ PCIE_ATU_FUNC(PCI_FUNC(d));
+
+ if (PCI_BUS(d) == hose->first_busno + 1) {
+ ls_pcie_cfg0_set_busdev(pcie, busdev);
+ addr = pcie->va_cfg0 + (where & ~0x3);
+ } else {
+ ls_pcie_cfg1_set_busdev(pcie, busdev);
+ addr = pcie->va_cfg1 + (where & ~0x3);
+ }
+ }
+
+ writel(val, addr);
+
+ return 0;
+}
+
+static void ls_pcie_setup_ctrl(struct ls_pcie *pcie,
+ struct ls_pcie_info *info)
+{
+ struct pci_controller *hose = &pcie->hose;
+ pci_dev_t dev = PCI_BDF(hose->first_busno, 0, 0);
+
+ ls_pcie_setup_atu(pcie, info);
+
+ pci_hose_write_config_dword(hose, dev, PCI_BASE_ADDRESS_0, 0);
+
+ /* program correct class for RC */
+ pci_hose_write_config_word(hose, dev, PCI_CLASS_DEVICE,
+ PCI_CLASS_BRIDGE_PCI);
+}
+
+int ls_pcie_init_ctrl(int busno, enum srds_prtcl dev, struct ls_pcie_info *info)
+{
+ struct ls_pcie *pcie;
+ struct pci_controller *hose;
+ int num = dev - PCIE1;
+ pci_dev_t pdev = PCI_BDF(busno, 0, 0);
+ int i, linkup, ep_mode;
+ u8 header_type;
+ u16 temp16;
+
+ if (!is_serdes_configured(dev)) {
+ printf("PCIe%d: disabled\n", num + 1);
+ return busno;
+ }
+
+ pcie = malloc(sizeof(*pcie));
+ if (!pcie)
+ return busno;
+ memset(pcie, 0, sizeof(*pcie));
+
+ hose = &pcie->hose;
+ hose->priv_data = pcie;
+ hose->first_busno = busno;
+ pcie->idx = num;
+ pcie->dbi = map_physmem(info->regs, PCIE_DBI_SIZE, MAP_NOCACHE);
+ pcie->va_cfg0 = map_physmem(info->cfg0_phys,
+ info->cfg0_size,
+ MAP_NOCACHE);
+ pcie->va_cfg1 = map_physmem(info->cfg1_phys,
+ info->cfg1_size,
+ MAP_NOCACHE);
+
+ /* outbound memory */
+ pci_set_region(&hose->regions[0],
+ (pci_size_t)info->mem_bus,
+ (phys_size_t)info->mem_phys,
+ (pci_size_t)info->mem_size,
+ PCI_REGION_MEM);
+
+ /* outbound io */
+ pci_set_region(&hose->regions[1],
+ (pci_size_t)info->io_bus,
+ (phys_size_t)info->io_phys,
+ (pci_size_t)info->io_size,
+ PCI_REGION_IO);
+
+ /* System memory space */
+ pci_set_region(&hose->regions[2],
+ CONFIG_SYS_PCI_MEMORY_BUS,
+ CONFIG_SYS_PCI_MEMORY_PHYS,
+ CONFIG_SYS_PCI_MEMORY_SIZE,
+ PCI_REGION_SYS_MEMORY);
+
+ hose->region_count = 3;
+
+ for (i = 0; i < hose->region_count; i++)
+ debug("PCI reg:%d %016llx:%016llx %016llx %08lx\n",
+ i,
+ (u64)hose->regions[i].phys_start,
+ (u64)hose->regions[i].bus_start,
+ (u64)hose->regions[i].size,
+ hose->regions[i].flags);
+
+ pci_set_ops(hose,
+ pci_hose_read_config_byte_via_dword,
+ pci_hose_read_config_word_via_dword,
+ ls_pcie_read_config,
+ pci_hose_write_config_byte_via_dword,
+ pci_hose_write_config_word_via_dword,
+ ls_pcie_write_config);
+
+ pci_hose_read_config_byte(hose, pdev, PCI_HEADER_TYPE, &header_type);
+ ep_mode = (header_type & 0x7f) == PCI_HEADER_TYPE_NORMAL;
+ printf("PCIe%u: %s ", info->pci_num,
+ ep_mode ? "Endpoint" : "Root Complex");
+
+ linkup = ls_pcie_link_up(pcie);
+
+ if (!linkup) {
+ /* Let the user know there's no PCIe link */
+ printf("no link, regs @ 0x%lx\n", info->regs);
+ hose->last_busno = hose->first_busno;
+ return busno;
+ }
+
+ /* Print the negotiated PCIe link width */
+ pci_hose_read_config_word(hose, dev, PCIE_LINK_STA, &temp16);
+ printf("x%d gen%d, regs @ 0x%lx\n", (temp16 & 0x3f0) >> 4,
+ (temp16 & 0xf), info->regs);
+
+ if (ep_mode)
+ return busno;
+
+ ls_pcie_setup_ctrl(pcie, info);
+
+ pci_register_hose(hose);
+
+ hose->last_busno = pci_hose_scan(hose);
+
+ printf("PCIe%x: Bus %02x - %02x\n",
+ info->pci_num, hose->first_busno, hose->last_busno);
+
+ return hose->last_busno + 1;
+}
+
+int ls_pcie_init_board(int busno)
+{
+ struct ls_pcie_info info;
+
+#ifdef CONFIG_PCIE1
+ SET_LS_PCIE_INFO(info, 1);
+ busno = ls_pcie_init_ctrl(busno, PCIE1, &info);
+#endif
+
+#ifdef CONFIG_PCIE2
+ SET_LS_PCIE_INFO(info, 2);
+ busno = ls_pcie_init_ctrl(busno, PCIE2, &info);
+#endif
+
+#ifdef CONFIG_PCIE3
+ SET_LS_PCIE_INFO(info, 3);
+ busno = ls_pcie_init_ctrl(busno, PCIE3, &info);
+#endif
+
+#ifdef CONFIG_PCIE4
+ SET_LS_PCIE_INFO(info, 4);
+ busno = ls_pcie_init_ctrl(busno, PCIE4, &info);
+#endif
+
+ return busno;
+}
+
+void pci_init_board(void)
+{
+ ls_pcie_init_board(0);
+}
+
#ifdef CONFIG_OF_BOARD_SETUP
#include <libfdt.h>
#include <fdt_support.h>
@@ -38,6 +495,14 @@ void ft_pcie_setup(void *blob, bd_t *bd)
#ifdef CONFIG_PCIE2
ft_pcie_ls_setup(blob, FSL_PCIE_COMPAT, CONFIG_SYS_PCIE2_ADDR, PCIE2);
#endif
+
+ #ifdef CONFIG_PCIE3
+ ft_pcie_ls_setup(blob, FSL_PCIE_COMPAT, CONFIG_SYS_PCIE3_ADDR, PCIE3);
+ #endif
+
+ #ifdef CONFIG_PCIE4
+ ft_pcie_ls_setup(blob, FSL_PCIE_COMPAT, CONFIG_SYS_PCIE4_ADDR, PCIE4);
+ #endif
}
#else
@@ -45,7 +510,3 @@ void ft_pcie_setup(void *blob, bd_t *bd)
{
}
#endif
-
-void pci_init_board(void)
-{
-}
--
1.9.1
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