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Diffstat (limited to 'target/linux/bcm53xx/patches-3.18/170-pcie2-bcma-add-new-PCIe2-driver-for-bcma.patch')
-rw-r--r--target/linux/bcm53xx/patches-3.18/170-pcie2-bcma-add-new-PCIe2-driver-for-bcma.patch535
1 files changed, 535 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/patches-3.18/170-pcie2-bcma-add-new-PCIe2-driver-for-bcma.patch b/target/linux/bcm53xx/patches-3.18/170-pcie2-bcma-add-new-PCIe2-driver-for-bcma.patch
new file mode 100644
index 0000000..9c8aa3b
--- /dev/null
+++ b/target/linux/bcm53xx/patches-3.18/170-pcie2-bcma-add-new-PCIe2-driver-for-bcma.patch
@@ -0,0 +1,535 @@
+From cf067bf8bb993d6cfdc42d750ae241c43f88403f Mon Sep 17 00:00:00 2001
+From: Hauke Mehrtens <hauke@hauke-m.de>
+Date: Mon, 12 May 2014 11:55:20 +0200
+Subject: [PATCH 1/2] PCI: BCM5301X: add PCIe2 driver for BCM5301X SoCs
+
+This driver supports the PCIe controller found on the BCM4708 and
+similar SoCs. The controller itself is automatically detected by bcma.
+
+This controller is found on SoCs usually used in SOHO routers to
+connect the wifi cards to the SoC. All the of the BCM5301X SoCs I know
+of have 2 or 3 of these controllers in the SoC.
+
+I had to use PCI domains otherwise the pci_create_root_bus() function
+in drivers/pci/probe.c would fail for the second controller being
+registered because pci_find_bus() would find the same PCIe bus again
+and assume it is already registered, which ends up in a kernel panic in
+pcibios_init_hw() in arch/arm/kernel/bios32.c
+
+The ARM PCI code assumes that every controller has an I/O space and
+adds a dummy area if the driver does not specify one. This will work
+for the first controller, but when we register the second one this will
+result in an error. To prevent this problem we add an empty I/O space.
+
+Currently I have problems with probing the devices on the bus, because
+pci_bus_add_devices() is called too early in pci_scan_root_bus() in
+drivers/pci/probe.c, before pci_bus_assign_resources() was called in
+pci_common_init_dev() in arch/arm/kernel/bios32.c. When the devices are
+added too early they do not have any resources and adding fails. I have
+to remove the call to pci_bus_add_devices() in pci_scan_root_bus() to
+make registration work, calling pci_bus_add_devices() later again does
+not fix this problem.
+
+Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
+---
+ arch/arm/mach-bcm/Kconfig | 1 +
+ drivers/pci/host/Kconfig | 7 +
+ drivers/pci/host/Makefile | 1 +
+ drivers/pci/host/pci-host-bcm5301x.c | 428 +++++++++++++++++++++++++++++++++++
+ 4 files changed, 437 insertions(+)
+ create mode 100644 drivers/pci/host/pci-host-bcm5301x.c
+
+--- a/arch/arm/mach-bcm/Kconfig
++++ b/arch/arm/mach-bcm/Kconfig
+@@ -86,6 +86,7 @@ config ARCH_BCM_5301X
+ select HAVE_ARM_TWD if SMP
+ select ARM_GLOBAL_TIMER
+ select CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
++ select PCI_DOMAINS if PCI
+ help
+ Support for Broadcom BCM470X and BCM5301X SoCs with ARM CPU cores.
+
+--- a/drivers/pci/host/Kconfig
++++ b/drivers/pci/host/Kconfig
+@@ -91,4 +91,11 @@ config PCI_XGENE
+ There are 5 internal PCIe ports available. Each port is GEN3 capable
+ and have varied lanes from x1 to x8.
+
++config PCI_BCM5301X
++ bool "BCM5301X PCIe2 host controller"
++ depends on BCMA && OF && ARM && PCI_DOMAINS
++ help
++ Say Y here if you want to support the PCIe host controller found
++ on Broadcom BCM5301X and BCM470X (Northstar) SoCs.
++
+ endmenu
+--- a/drivers/pci/host/Makefile
++++ b/drivers/pci/host/Makefile
+@@ -11,3 +11,4 @@ obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spe
+ obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o
+ obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o
+ obj-$(CONFIG_PCI_XGENE) += pci-xgene.o
++obj-$(CONFIG_PCI_BCM5301X) += pci-host-bcm5301x.o
+--- /dev/null
++++ b/drivers/pci/host/pci-host-bcm5301x.c
+@@ -0,0 +1,460 @@
++/*
++ * Northstar PCI-Express driver
++ * Only supports Root-Complex (RC) mode
++ *
++ * Notes:
++ * PCI Domains are being used to identify the PCIe port 1:1.
++ *
++ * Only MEM access is supported, PAX does not support IO.
++ *
++ * Copyright 2012-2014, Broadcom Corporation
++ * Copyright 2014, Hauke Mehrtens <hauke@hauke-m.de>
++ *
++ * Licensed under the GNU/GPL. See COPYING for details.
++ */
++
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/delay.h>
++#include <linux/pci.h>
++#include <linux/io.h>
++#include <linux/ioport.h>
++#include <linux/bcma/bcma.h>
++#include <linux/bcma/bcma_driver_pcie2.h>
++
++#define SOC_PCIE_HDR_OFF 0x400 /* 256 bytes per function */
++
++#define PCI_LINK_STATUS_CTRL_2_OFFSET 0xDC
++#define PCI_TARGET_LINK_SPEED_MASK 0xF
++#define PCI_TARGET_LINK_SPEED_GEN2 0x2
++#define PCI_TARGET_LINK_SPEED_GEN1 0x1
++
++static int bcma_pcie2_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
++{
++ struct pci_sys_data *sys = pdev->sysdata;
++ struct bcma_device *bdev = sys->private_data;
++
++ return bcma_core_irq(bdev, 5);
++}
++
++static u32 bcma_pcie2_cfg_base(struct bcma_device *bdev, int busno,
++ unsigned int devfn, int where)
++{
++ int slot = PCI_SLOT(devfn);
++ int fn = PCI_FUNC(devfn);
++ u32 addr_reg;
++
++ if (busno == 0) {
++ if (slot >= 1)
++ return 0;
++ bcma_write32(bdev, BCMA_CORE_PCIE2_CONFIGINDADDR,
++ where & 0xffc);
++ return BCMA_CORE_PCIE2_CONFIGINDDATA;
++ }
++ if (fn > 1)
++ return 0;
++ addr_reg = (busno & 0xff) << 20 | (slot << 15) | (fn << 12) |
++ (where & 0xffc) | (1 & 0x3);
++
++ bcma_write32(bdev, BCMA_CORE_PCIE2_CFG_ADDR, addr_reg);
++ return BCMA_CORE_PCIE2_CFG_DATA;
++}
++
++static u32 bcma_pcie2_read_config(struct bcma_device *bdev, int busno,
++ unsigned int devfn, int where, int size)
++{
++ u32 base;
++ u32 data_reg;
++ u32 mask;
++ int shift;
++
++ base = bcma_pcie2_cfg_base(bdev, busno, devfn, where);
++
++ if (!base)
++ return ~0UL;
++
++ data_reg = bcma_read32(bdev, base);
++
++ if (size == 4)
++ return data_reg;
++
++ mask = (1 << (size * 8)) - 1;
++ shift = (where % 4) * 8;
++ return (data_reg >> shift) & mask;
++}
++
++static void bcma_pcie2_write_config(struct bcma_device *bdev, int busno,
++ unsigned int devfn, int where, int size,
++ u32 val)
++{
++ u32 base;
++ u32 data_reg;
++
++ base = bcma_pcie2_cfg_base(bdev, busno, devfn, where);
++
++ if (!base)
++ return;
++
++ if (size < 4) {
++ u32 mask = (1 << (size * 8)) - 1;
++ int shift = (where % 4) * 8;
++
++ data_reg = bcma_read32(bdev, base);
++ data_reg &= ~(mask << shift);
++ data_reg |= (val & mask) << shift;
++ } else {
++ data_reg = val;
++ }
++
++ bcma_write32(bdev, base, data_reg);
++}
++
++static int bcma_pcie2_read_config_pci(struct pci_bus *bus, unsigned int devfn,
++ int where, int size, u32 *val)
++{
++ struct pci_sys_data *sys = bus->sysdata;
++ struct bcma_device *bdev = sys->private_data;
++
++ *val = bcma_pcie2_read_config(bdev, bus->number, devfn, where, size);
++
++ return PCIBIOS_SUCCESSFUL;
++}
++
++static int bcma_pcie2_write_config_pci(struct pci_bus *bus, unsigned int devfn,
++ int where, int size, u32 val)
++{
++ struct pci_sys_data *sys = bus->sysdata;
++ struct bcma_device *bdev = sys->private_data;
++
++ bcma_pcie2_write_config(bdev, bus->number, devfn, where, size, val);
++
++ return PCIBIOS_SUCCESSFUL;
++}
++
++/*
++ * Methods for accessing configuration registers
++ */
++static struct pci_ops bcma_pcie2_ops = {
++ .read = bcma_pcie2_read_config_pci,
++ .write = bcma_pcie2_write_config_pci,
++};
++
++/* NS: CLASS field is R/O, and set to wrong 0x200 value */
++static void bcma_pcie2_fixup_class(struct pci_dev *dev)
++{
++ dev->class = PCI_CLASS_BRIDGE_PCI << 8;
++}
++DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x8011, bcma_pcie2_fixup_class);
++DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x8012, bcma_pcie2_fixup_class);
++
++/*
++ * Check link status, return 0 if link is up in RC mode,
++ * otherwise return non-zero
++ */
++static int bcma_pcie2_check_link(struct bcma_device *bdev, struct pci_sys_data *sys)
++{
++ u32 tmp32;
++ u16 tmp16;
++ u16 pos;
++ u8 nlw;
++ /*
++ * Setup callback (bcma_pcie2_setup) is called in pcibios_init_hw before
++ * creating bus root, so we don't have it here yet. On the other hand
++ * we really want to use pci_bus_find_capability helper to check NLW.
++ * Let's fake simple pci_bus just to query for capabilities.
++ */
++ struct pci_bus bus = {
++ .number = 0,
++ .ops = &bcma_pcie2_ops,
++ .sysdata = sys,
++ };
++
++ tmp32 = bcma_read32(bdev, BCMA_CORE_PCIE2_LINK_STATUS);
++ dev_dbg(&bdev->dev, "link status: 0x%08x\n", tmp32);
++
++ tmp32 = bcma_read32(bdev, BCMA_CORE_PCIE2_STRAP_STATUS);
++ dev_dbg(&bdev->dev, "strap status: 0x%08x\n", tmp32);
++
++ /* 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, &tmp16);
++ nlw = (tmp16 & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT;
++
++ if (nlw == 0) {
++ /* try GEN 1 link speed */
++ tmp32 = bcma_pcie2_read_config(bdev, 0, 0,
++ PCI_LINK_STATUS_CTRL_2_OFFSET, 4);
++ if ((tmp32 & PCI_TARGET_LINK_SPEED_MASK) ==
++ PCI_TARGET_LINK_SPEED_GEN2) {
++ tmp32 &= ~PCI_TARGET_LINK_SPEED_MASK;
++ tmp32 |= PCI_TARGET_LINK_SPEED_GEN1;
++ bcma_pcie2_write_config(bdev, 0, 0,
++ PCI_LINK_STATUS_CTRL_2_OFFSET, 4, tmp32);
++ tmp32 = bcma_pcie2_read_config(bdev, 0, 0,
++ PCI_LINK_STATUS_CTRL_2_OFFSET, 4);
++ msleep(100);
++
++ pos = pci_bus_find_capability(&bus, 0, PCI_CAP_ID_EXP);
++ pci_bus_read_config_word(&bus, 0, pos + PCI_EXP_LNKSTA,
++ &tmp16);
++ nlw = (tmp16 & PCI_EXP_LNKSTA_NLW) >>
++ PCI_EXP_LNKSTA_NLW_SHIFT;
++ }
++ }
++
++ dev_info(&bdev->dev, "link: %s\n", nlw ? "UP" : "DOWN");
++ return nlw ? 0 : -ENODEV;
++}
++
++/*
++ * Initializte the PCIe controller
++ */
++static void bcma_pcie2_hw_init(struct bcma_device *bdev)
++{
++ u32 tmp32;
++ u16 tmp16;
++
++ /* Change MPS and MRRS to 512 */
++ tmp16 = bcma_pcie2_read_config(bdev, 0, 0, 0x4d4, 2);
++ tmp16 &= ~7;
++ tmp16 |= 2;
++ bcma_pcie2_write_config(bdev, 0, 0, 0x4d4, 2, tmp16);
++
++ tmp32 = bcma_pcie2_read_config(bdev, 0, 0, 0xb4, 4);
++ tmp32 &= ~((7 << 12) | (7 << 5));
++ tmp32 |= (2 << 12) | (2 << 5);
++ bcma_pcie2_write_config(bdev, 0, 0, 0xb4, 4, tmp32);
++
++ /*
++ * Turn-on Root-Complex (RC) mode, from reset default of EP
++ * The mode is set by straps, can be overwritten via DMU
++ * register <cru_straps_control> bit 5, "1" means RC
++ */
++
++ /* Send a downstream reset */
++ bcma_write32(bdev, BCMA_CORE_PCIE2_CLK_CONTROL,
++ PCIE2_CLKC_RST_OE | PCIE2_CLKC_RST);
++ usleep_range(250, 400);
++ bcma_write32(bdev, BCMA_CORE_PCIE2_CLK_CONTROL, PCIE2_CLKC_RST_OE);
++ msleep(250);
++
++ /* TBD: take care of PM, check we're on */
++}
++
++/*
++ * Setup the address translation
++ *
++ * NOTE: All PCI-to-CPU address mapping are 1:1 for simplicity
++ */
++static int bcma_pcie2_map_init(struct bcma_device *bdev, u32 addr)
++{
++ /* 64MB alignment */
++ if (!addr || (addr & (SZ_64M - 1)))
++ return -EINVAL;
++
++ bcma_write32(bdev, BCMA_CORE_PCIE2_OMAP0_LOWER, addr);
++ bcma_write32(bdev, BCMA_CORE_PCIE2_OARR0, addr | 0x01);
++
++ bcma_write32(bdev, BCMA_CORE_PCIE2_OMAP1_LOWER, addr + SZ_64M);
++ bcma_write32(bdev, BCMA_CORE_PCIE2_OARR1, (addr + SZ_64M) | 0x01);
++
++ /*
++ * Inbound address translation setup
++ * Northstar only maps up to 128 MiB inbound, DRAM could be up to 1 GiB.
++ *
++ * For now allow access to entire DRAM, assuming it is less than 128MiB,
++ * otherwise DMA bouncing mechanism may be required.
++ * Also consider DMA mask to limit DMA physical address
++ */
++ /* 64-bit LE regs, write low word, high is 0 at reset */
++ bcma_write32(bdev, BCMA_CORE_PCIE2_FUNC0_IMAP1, PHYS_OFFSET | 0x1);
++ bcma_write32(bdev, BCMA_CORE_PCIE2_IARR1_LOWER,
++ PHYS_OFFSET | ((SZ_128M >> 20) & 0xff));
++ return 0;
++}
++
++/*
++ * Setup PCIE Host bridge
++ */
++static int bcma_pcie2_bridge_init(struct bcma_device *bdev, u32 addr, u32 size)
++{
++ bcma_pcie2_write_config(bdev, 0, 0, PCI_PRIMARY_BUS, 1, 0);
++ bcma_pcie2_write_config(bdev, 0, 0, PCI_SECONDARY_BUS, 1, 1);
++ bcma_pcie2_write_config(bdev, 0, 0, PCI_SUBORDINATE_BUS, 1, 4);
++
++ bcma_pcie2_read_config(bdev, 0, 0, PCI_PRIMARY_BUS, 1);
++ bcma_pcie2_read_config(bdev, 0, 0, PCI_SECONDARY_BUS, 1);
++ bcma_pcie2_read_config(bdev, 0, 0, PCI_SUBORDINATE_BUS, 1);
++
++ /* MEM_BASE, MEM_LIM require 1MB alignment */
++ if (((addr >> 16) & 0xf) || (((addr + size) >> 16) & 0xf))
++ return -EINVAL;
++
++ bcma_pcie2_write_config(bdev, 0, 0, PCI_MEMORY_BASE, 2, addr >> 16);
++ bcma_pcie2_write_config(bdev, 0, 0, PCI_MEMORY_LIMIT, 2,
++ (addr + size) >> 16);
++
++ /* These registers are not supported on the NS */
++ bcma_pcie2_write_config(bdev, 0, 0, PCI_IO_BASE_UPPER16, 2, 0);
++ bcma_pcie2_write_config(bdev, 0, 0, PCI_IO_LIMIT_UPPER16, 2, 0);
++
++ /* Force class to that of a Bridge */
++ bcma_pcie2_write_config(bdev, 0, 0, PCI_CLASS_DEVICE, 2,
++ PCI_CLASS_BRIDGE_PCI);
++
++ bcma_pcie2_read_config(bdev, 0, 0, PCI_CLASS_DEVICE, 2);
++ bcma_pcie2_read_config(bdev, 0, 0, PCI_MEMORY_BASE, 2);
++ bcma_pcie2_read_config(bdev, 0, 0, PCI_MEMORY_LIMIT, 2);
++ return 0;
++}
++
++static void bcma_pcie2_3rd_init(struct bcma_bus *bus)
++{
++ /* PCIE PLL block register (base 0x8000) */
++ bcma_chipco_b_mii_write(&bus->drv_cc_b, 0x00000088, 0x57fe8000);
++ /* Check PCIE PLL lock status */
++ bcma_chipco_b_mii_write(&bus->drv_cc_b, 0x00000088, 0x67c60000);
++}
++
++/* To improve PCIE phy jitter */
++static void bcma_pcie2_improve_phy_jitter(struct bcma_bus *bus, int phyaddr)
++{
++ u32 val;
++
++ /* Change blkaddr */
++ val = (1 << 30) | (1 << 28) | (phyaddr << 23) | (0x1f << 18) |
++ (2 << 16) | (0x863 << 4);
++ bcma_chipco_b_mii_write(&bus->drv_cc_b, 0x0000009a, val);
++
++ /* Write 0x0190 to 0x13 regaddr */
++ val = (1 << 30) | (1 << 28) | (phyaddr << 23) | (0x13 << 18) |
++ (2 << 16) | 0x0190;
++ bcma_chipco_b_mii_write(&bus->drv_cc_b, 0x0000009a, val);
++
++ /* Write 0x0191 to 0x19 regaddr */
++ val = (1 << 30) | (1 << 28) | (phyaddr << 23) | (0x19 << 18) |
++ (2 << 16) | 0x0191;
++ bcma_chipco_b_mii_write(&bus->drv_cc_b, 0x0000009a, val);
++}
++
++static int bcma_pcie2_setup(int nr, struct pci_sys_data *sys)
++{
++ struct bcma_device *bdev = sys->private_data;
++ struct bcma_bus *bus = bdev->bus;
++ struct resource *res;
++ struct bcma_device *arm_core;
++ u32 cru_straps_ctrl;
++ int ret;
++ int phyaddr;
++
++ if (bdev->core_unit == 2) {
++ arm_core = bcma_find_core(bus, BCMA_CORE_ARMCA9);
++ cru_straps_ctrl = bcma_read32(arm_core, 0x2a0);
++
++ /* 3rd PCIE is not selected */
++ if (cru_straps_ctrl & 0x10)
++ return -ENODEV;
++
++ bcma_pcie2_3rd_init(bus);
++ phyaddr = 0xf;
++ } else {
++ phyaddr = bdev->core_unit;
++ }
++ bcma_pcie2_improve_phy_jitter(bus, phyaddr);
++
++ /* create mem resource */
++ res = devm_kzalloc(&bdev->dev, sizeof(*res), GFP_KERNEL);
++ if (!res)
++ return -EINVAL;
++
++ res->start = bdev->addr_s[0];
++ res->end = bdev->addr_s[0] + SZ_128M -1;
++ res->name = "PCIe dummy IO space";
++ res->flags = IORESOURCE_MEM;
++
++ pci_add_resource(&sys->resources, res);
++
++ /* This PCIe controller does not support IO Mem, so use a dummy one. */
++ res = devm_kzalloc(&bdev->dev, sizeof(*res), GFP_KERNEL);
++ if (!res)
++ return -EINVAL;
++
++ res->start = 0;
++ res->end = 0;
++ res->name = "PCIe dummy IO space";
++ res->flags = IORESOURCE_IO;
++
++ pci_add_resource(&sys->resources, res);
++
++ bcma_pcie2_hw_init(bdev);
++ ret = bcma_pcie2_map_init(bdev, bdev->addr_s[0]);
++ if (ret)
++ return ret;
++
++ /*
++ * Skip inactive ports -
++ * will need to change this for hot-plugging
++ */
++ ret = bcma_pcie2_check_link(bdev, sys);
++ if (ret)
++ return ret;
++
++ ret = bcma_pcie2_bridge_init(bdev, bdev->addr_s[0], SZ_128M);
++ if (ret)
++ return ret;
++
++ return 1;
++}
++
++static int bcma_pcie2_probe(struct bcma_device *bdev)
++{
++ struct hw_pci hw = {
++ .nr_controllers = 1,
++ .domain = bdev->core_unit,
++ .private_data = (void **)&bdev,
++ .setup = bcma_pcie2_setup,
++ .map_irq = bcma_pcie2_map_irq,
++ .ops = &bcma_pcie2_ops,
++ };
++
++ dev_info(&bdev->dev, "initializing PCIe controller\n");
++
++ /* Announce this port to ARM/PCI common code */
++ pci_common_init_dev(&bdev->dev, &hw);
++
++ /* Setup virtual-wire interrupts */
++ bcma_write32(bdev, BCMA_CORE_PCIE2_SYS_RC_INTX_EN, 0xf);
++
++ /* Enable memory and bus master */
++ bcma_write32(bdev, SOC_PCIE_HDR_OFF + 4, 0x6);
++
++ return 0;
++}
++
++static const struct bcma_device_id bcma_pcie2_table[] = {
++ BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_NS_PCIEG2, BCMA_ANY_REV, BCMA_ANY_CLASS),
++ BCMA_CORETABLE_END
++};
++MODULE_DEVICE_TABLE(bcma, bcma_pcie2_table);
++
++static struct bcma_driver bcma_pcie2_driver = {
++ .name = KBUILD_MODNAME,
++ .id_table = bcma_pcie2_table,
++ .probe = bcma_pcie2_probe,
++};
++
++static int __init bcma_pcie2_init(void)
++{
++ return bcma_driver_register(&bcma_pcie2_driver);
++}
++module_init(bcma_pcie2_init);
++
++static void __exit bcma_pcie2_exit(void)
++{
++ bcma_driver_unregister(&bcma_pcie2_driver);
++}
++module_exit(bcma_pcie2_exit);
++
++MODULE_AUTHOR("Hauke Mehrtens");
++MODULE_DESCRIPTION("BCM5301X PCIe host controller");
++MODULE_LICENSE("GPLv2");
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