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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
commitb4b7ff4b08e691656c9d77c758fc355833128ac0 (patch)
tree82fcb00e6b918026dc9f2d1f05ed8eee83874cc0 /drivers/pci/host/pcie-iproc.c
parent35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 (diff)
Linux-libre 4.4-gnupck-4.4-gnu
Diffstat (limited to 'drivers/pci/host/pcie-iproc.c')
-rw-r--r--drivers/pci/host/pcie-iproc.c163
1 files changed, 149 insertions, 14 deletions
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index fe2efb141..eac719af1 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -1,6 +1,6 @@
/*
* Copyright (C) 2014 Hauke Mehrtens <hauke@hauke-m.de>
- * Copyright (C) 2015 Broadcom Corporatcommon ion
+ * 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
@@ -31,6 +31,8 @@
#include "pcie-iproc.h"
#define CLK_CONTROL_OFFSET 0x000
+#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
@@ -58,6 +60,24 @@
#define SYS_RC_INTX_EN 0x330
#define SYS_RC_INTX_MASK 0xf
+#define PCIE_LINK_STATUS_OFFSET 0xf0c
+#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 OARR_VALID_SHIFT 0
+#define OARR_VALID BIT(OARR_VALID_SHIFT)
+#define OARR_SIZE_CFG_SHIFT 1
+#define OARR_SIZE_CFG BIT(OARR_SIZE_CFG_SHIFT)
+
+#define OARR_LO(window) (0xd20 + (window) * 8)
+#define OARR_HI(window) (0xd24 + (window) * 8)
+#define OMAP_LO(window) (0xd40 + (window) * 8)
+#define OMAP_HI(window) (0xd44 + (window) * 8)
+
+#define MAX_NUM_OB_WINDOWS 2
+
static inline struct iproc_pcie *iproc_data(struct pci_bus *bus)
{
struct iproc_pcie *pcie;
@@ -119,23 +139,32 @@ static void iproc_pcie_reset(struct iproc_pcie *pcie)
u32 val;
/*
- * Configure the PCIe controller as root complex and send a downstream
- * reset
+ * Select perst_b signal as reset source. Put the device into reset,
+ * and then bring it out of reset
*/
- val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
+ val = readl(pcie->base + CLK_CONTROL_OFFSET);
+ val &= ~EP_PERST_SOURCE_SELECT & ~EP_MODE_SURVIVE_PERST &
+ ~RC_PCIE_RST_OUTPUT;
writel(val, pcie->base + CLK_CONTROL_OFFSET);
udelay(250);
- val &= ~EP_MODE_SURVIVE_PERST;
+
+ val |= RC_PCIE_RST_OUTPUT;
writel(val, pcie->base + CLK_CONTROL_OFFSET);
- msleep(250);
+ msleep(100);
}
static int iproc_pcie_check_link(struct iproc_pcie *pcie, struct pci_bus *bus)
{
u8 hdr_type;
- u32 link_ctrl;
+ u32 link_ctrl, class, val;
u16 pos, link_status;
- int link_is_active = 0;
+ bool link_is_active = false;
+
+ val = readl(pcie->base + PCIE_LINK_STATUS_OFFSET);
+ if (!(val & PCIE_PHYLINKUP) || !(val & PCIE_DL_ACTIVE)) {
+ dev_err(pcie->dev, "PHY or data link is INACTIVE!\n");
+ return -ENODEV;
+ }
/* make sure we are not in EP mode */
pci_bus_read_config_byte(bus, 0, PCI_HEADER_TYPE, &hdr_type);
@@ -145,14 +174,19 @@ static int iproc_pcie_check_link(struct iproc_pcie *pcie, struct pci_bus *bus)
}
/* force class to PCI_CLASS_BRIDGE_PCI (0x0604) */
- pci_bus_write_config_word(bus, 0, PCI_CLASS_DEVICE,
- PCI_CLASS_BRIDGE_PCI);
+#define PCI_BRIDGE_CTRL_REG_OFFSET 0x43c
+#define PCI_CLASS_BRIDGE_MASK 0xffff00
+#define PCI_CLASS_BRIDGE_SHIFT 8
+ pci_bus_read_config_dword(bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, &class);
+ class &= ~PCI_CLASS_BRIDGE_MASK;
+ class |= (PCI_CLASS_BRIDGE_PCI << PCI_CLASS_BRIDGE_SHIFT);
+ pci_bus_write_config_dword(bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, class);
/* check link status to see if link is active */
pos = pci_bus_find_capability(bus, 0, PCI_CAP_ID_EXP);
pci_bus_read_config_word(bus, 0, pos + PCI_EXP_LNKSTA, &link_status);
if (link_status & PCI_EXP_LNKSTA_NLW)
- link_is_active = 1;
+ link_is_active = true;
if (!link_is_active) {
/* try GEN 1 link speed */
@@ -176,7 +210,7 @@ static int iproc_pcie_check_link(struct iproc_pcie *pcie, struct pci_bus *bus)
pci_bus_read_config_word(bus, 0, pos + PCI_EXP_LNKSTA,
&link_status);
if (link_status & PCI_EXP_LNKSTA_NLW)
- link_is_active = 1;
+ link_is_active = true;
}
}
@@ -190,6 +224,101 @@ static void iproc_pcie_enable(struct iproc_pcie *pcie)
writel(SYS_RC_INTX_MASK, pcie->base + SYS_RC_INTX_EN);
}
+/**
+ * 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;
+ unsigned i;
+ u64 max_size = (u64)ob->window_size * MAX_NUM_OB_WINDOWS;
+ u64 remainder;
+
+ if (size > max_size) {
+ dev_err(pcie->dev,
+ "res size 0x%pap exceeds max supported size 0x%llx\n",
+ &size, max_size);
+ return -EINVAL;
+ }
+
+ div64_u64_rem(size, ob->window_size, &remainder);
+ if (remainder) {
+ dev_err(pcie->dev,
+ "res size %pap needs to be multiple of window size %pap\n",
+ &size, &ob->window_size);
+ return -EINVAL;
+ }
+
+ if (axi_addr < ob->axi_offset) {
+ dev_err(pcie->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;
+
+ for (i = 0; i < MAX_NUM_OB_WINDOWS; i++) {
+ writel(lower_32_bits(axi_addr) | OARR_VALID |
+ (ob->set_oarr_size ? 1 : 0), pcie->base + OARR_LO(i));
+ writel(upper_32_bits(axi_addr), pcie->base + OARR_HI(i));
+ writel(lower_32_bits(pci_addr), pcie->base + OMAP_LO(i));
+ writel(upper_32_bits(pci_addr), pcie->base + OMAP_HI(i));
+
+ size -= ob->window_size;
+ if (size == 0)
+ break;
+
+ axi_addr += ob->window_size;
+ pci_addr += ob->window_size;
+ }
+
+ return 0;
+}
+
+static int iproc_pcie_map_ranges(struct iproc_pcie *pcie,
+ struct list_head *resources)
+{
+ 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(pcie->dev, "invalid resource %pR\n", res);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
{
int ret;
@@ -213,6 +342,14 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
iproc_pcie_reset(pcie);
+ if (pcie->need_ob_cfg) {
+ ret = iproc_pcie_map_ranges(pcie, res);
+ if (ret) {
+ dev_err(pcie->dev, "map failed\n");
+ goto err_power_off_phy;
+ }
+ }
+
#ifdef CONFIG_ARM
pcie->sysdata.private_data = pcie;
sysdata = &pcie->sysdata;
@@ -238,9 +375,7 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
pci_scan_child_bus(bus);
pci_assign_unassigned_bus_resources(bus);
-#ifdef CONFIG_ARM
pci_fixup_irqs(pci_common_swizzle, pcie->map_irq);
-#endif
pci_bus_add_devices(bus);
return 0;