--- /dev/null
+From 6891d3c1014cf56dc76ec583b69d341ea47984d6 Mon Sep 17 00:00:00 2001
+From: Maxime Bizon <mbizon@freebox.fr>
+Date: Fri, 18 Jul 2008 20:34:35 +0200
+Subject: [PATCH] [MIPS] BCM63XX: Change PCI code to emulate a fake cardbus bridge.
+
+Signed-off-by: Maxime Bizon <mbizon@freebox.fr>
+---
+ arch/mips/pci/ops-bcm63xx.c | 288 +++++++++++++++++++++++++++++++++++++++++++
+ arch/mips/pci/pci-bcm63xx.c | 44 +++++++
+ 2 files changed, 332 insertions(+), 0 deletions(-)
+
+diff --git a/arch/mips/pci/ops-bcm63xx.c b/arch/mips/pci/ops-bcm63xx.c
+index f8dce9d..822ae17 100644
+--- a/arch/mips/pci/ops-bcm63xx.c
++++ b/arch/mips/pci/ops-bcm63xx.c
+@@ -177,3 +177,291 @@ struct pci_ops bcm63xx_pci_ops = {
+ .read = bcm63xx_pci_read,
+ .write = bcm63xx_pci_write
+ };
++
++#ifdef CONFIG_CARDBUS
++/*
++ * emulate configuration read access on a cardbus bridge
++ */
++#define FAKE_CB_BRIDGE_SLOT 0x1e
++
++static int fake_cb_bridge_bus_number = -1;
++
++static struct {
++ u16 pci_command;
++ u8 cb_latency;
++ u8 subordinate_busn;
++ u8 cardbus_busn;
++ u8 pci_busn;
++ int bus_assigned;
++ u16 bridge_control;
++
++ u32 mem_base0;
++ u32 mem_limit0;
++ u32 mem_base1;
++ u32 mem_limit1;
++
++ u32 io_base0;
++ u32 io_limit0;
++ u32 io_base1;
++ u32 io_limit1;
++} fake_cb_bridge_regs;
++
++static int fake_cb_bridge_read(int where, int size, u32 *val)
++{
++ unsigned int reg;
++ u32 data;
++
++ data = 0;
++ reg = where >> 2;
++ switch (reg) {
++ case (PCI_VENDOR_ID >> 2):
++ case (PCI_CB_SUBSYSTEM_VENDOR_ID >> 2):
++ /* create dummy vendor/device id from our cpu id */
++ data = (bcm63xx_get_cpu_id() << 16) | PCI_VENDOR_ID_BROADCOM;
++ break;
++
++ case (PCI_COMMAND >> 2):
++ data = (PCI_STATUS_DEVSEL_SLOW << 16);
++ data |= fake_cb_bridge_regs.pci_command;
++ break;
++
++ case (PCI_CLASS_REVISION >> 2):
++ data = (PCI_CLASS_BRIDGE_CARDBUS << 16);
++ break;
++
++ case (PCI_CACHE_LINE_SIZE >> 2):
++ data = (PCI_HEADER_TYPE_CARDBUS << 16);
++ break;
++
++ case (PCI_INTERRUPT_LINE >> 2):
++ /* bridge control */
++ data = (fake_cb_bridge_regs.bridge_control << 16);
++ /* pin:intA line:0xff */
++ data |= (0x1 << 8) | 0xff;
++ break;
++
++ case (PCI_CB_PRIMARY_BUS >> 2):
++ data = (fake_cb_bridge_regs.cb_latency << 24);
++ data |= (fake_cb_bridge_regs.subordinate_busn << 16);
++ data |= (fake_cb_bridge_regs.cardbus_busn << 8);
++ data |= fake_cb_bridge_regs.pci_busn;
++ break;
++
++ case (PCI_CB_MEMORY_BASE_0 >> 2):
++ data = fake_cb_bridge_regs.mem_base0;
++ break;
++
++ case (PCI_CB_MEMORY_LIMIT_0 >> 2):
++ data = fake_cb_bridge_regs.mem_limit0;
++ break;
++
++ case (PCI_CB_MEMORY_BASE_1 >> 2):
++ data = fake_cb_bridge_regs.mem_base1;
++ break;
++
++ case (PCI_CB_MEMORY_LIMIT_1 >> 2):
++ data = fake_cb_bridge_regs.mem_limit1;
++ break;
++
++ case (PCI_CB_IO_BASE_0 >> 2):
++ /* | 1 for 32bits io support */
++ data = fake_cb_bridge_regs.io_base0 | 0x1;
++ break;
++
++ case (PCI_CB_IO_LIMIT_0 >> 2):
++ data = fake_cb_bridge_regs.io_limit0;
++ break;
++
++ case (PCI_CB_IO_BASE_1 >> 2):
++ /* | 1 for 32bits io support */
++ data = fake_cb_bridge_regs.io_base1 | 0x1;
++ break;
++
++ case (PCI_CB_IO_LIMIT_1 >> 2):
++ data = fake_cb_bridge_regs.io_limit1;
++ break;
++ }
++
++ *val = postprocess_read(data, where, size);
++ return PCIBIOS_SUCCESSFUL;
++}
++
++/*
++ * emulate configuration write access on a cardbus bridge
++ */
++static int fake_cb_bridge_write(int where, int size, u32 val)
++{
++ unsigned int reg;
++ u32 data, tmp;
++ int ret;
++
++ ret = fake_cb_bridge_read((where & ~0x3), 4, &data);
++ if (ret != PCIBIOS_SUCCESSFUL)
++ return ret;
++
++ data = preprocess_write(data, val, where, size);
++
++ reg = where >> 2;
++ switch (reg) {
++ case (PCI_COMMAND >> 2):
++ fake_cb_bridge_regs.pci_command = (data & 0xffff);
++ break;
++
++ case (PCI_CB_PRIMARY_BUS >> 2):
++ fake_cb_bridge_regs.cb_latency = (data >> 24) & 0xff;
++ fake_cb_bridge_regs.subordinate_busn = (data >> 16) & 0xff;
++ fake_cb_bridge_regs.cardbus_busn = (data >> 8) & 0xff;
++ fake_cb_bridge_regs.pci_busn = data & 0xff;
++ if (fake_cb_bridge_regs.cardbus_busn)
++ fake_cb_bridge_regs.bus_assigned = 1;
++ break;
++
++ case (PCI_INTERRUPT_LINE >> 2):
++ tmp = (data >> 16) & 0xffff;
++ /* disable memory prefetch support */
++ tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
++ tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
++ fake_cb_bridge_regs.bridge_control = tmp;
++ break;
++
++ case (PCI_CB_MEMORY_BASE_0 >> 2):
++ fake_cb_bridge_regs.mem_base0 = data;
++ break;
++
++ case (PCI_CB_MEMORY_LIMIT_0 >> 2):
++ fake_cb_bridge_regs.mem_limit0 = data;
++ break;
++
++ case (PCI_CB_MEMORY_BASE_1 >> 2):
++ fake_cb_bridge_regs.mem_base1 = data;
++ break;
++
++ case (PCI_CB_MEMORY_LIMIT_1 >> 2):
++ fake_cb_bridge_regs.mem_limit1 = data;
++ break;
++
++ case (PCI_CB_IO_BASE_0 >> 2):
++ fake_cb_bridge_regs.io_base0 = data;
++ break;
++
++ case (PCI_CB_IO_LIMIT_0 >> 2):
++ fake_cb_bridge_regs.io_limit0 = data;
++ break;
++
++ case (PCI_CB_IO_BASE_1 >> 2):
++ fake_cb_bridge_regs.io_base1 = data;
++ break;
++
++ case (PCI_CB_IO_LIMIT_1 >> 2):
++ fake_cb_bridge_regs.io_limit1 = data;
++ break;
++ }
++
++ return PCIBIOS_SUCCESSFUL;
++}
++
++static int bcm63xx_cb_read(struct pci_bus *bus, unsigned int devfn,
++ int where, int size, u32 *val)
++{
++ /* snoop access to slot 0x1e on root bus, we fake a cardbus
++ * bridge at this location */
++ if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) {
++ fake_cb_bridge_bus_number = bus->number;
++ return fake_cb_bridge_read(where, size, val);
++ }
++
++ /* a configuration cycle for the device behind the cardbus
++ * bridge is actually done as a type 0 cycle on the primary
++ * bus. This means that only one device can be on the cardbus
++ * bus */
++ if (fake_cb_bridge_regs.bus_assigned &&
++ bus->number == fake_cb_bridge_regs.cardbus_busn &&
++ PCI_SLOT(devfn) == 0)
++ return bcm63xx_do_cfg_read(0, 0,
++ PCI_DEVFN(CARDBUS_PCI_IDSEL, 0),
++ where, size, val);
++
++ return PCIBIOS_DEVICE_NOT_FOUND;
++}
++
++static int bcm63xx_cb_write(struct pci_bus *bus, unsigned int devfn,
++ int where, int size, u32 val)
++{
++ if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) {
++ fake_cb_bridge_bus_number = bus->number;
++ return fake_cb_bridge_write(where, size, val);
++ }
++
++ if (fake_cb_bridge_regs.bus_assigned &&
++ bus->number == fake_cb_bridge_regs.cardbus_busn &&
++ PCI_SLOT(devfn) == 0)
++ return bcm63xx_do_cfg_write(0, 0,
++ PCI_DEVFN(CARDBUS_PCI_IDSEL, 0),
++ where, size, val);
++
++ return PCIBIOS_DEVICE_NOT_FOUND;
++}
++
++struct pci_ops bcm63xx_cb_ops = {
++ .read = bcm63xx_cb_read,
++ .write = bcm63xx_cb_write,
++};
++
++/*
++ * only one IO window, so it cannot be shared by PCI and cardbus, use
++ * fixup to choose and detect unhandled configuration
++ */
++static void bcm63xx_fixup(struct pci_dev *dev)
++{
++ static int io_window = -1;
++ int i, found, new_io_window;
++ u32 val;
++
++ /* look for any io resource */
++ found = 0;
++ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
++ if (pci_resource_flags(dev, i) & IORESOURCE_IO) {
++ found = 1;
++ break;
++ }
++ }
++
++ if (!found)
++ return;
++
++ /* skip our fake bus with only cardbus bridge on it */
++ if (dev->bus->number == fake_cb_bridge_bus_number)
++ return;
++
++ /* find on which bus the device is */
++ if (fake_cb_bridge_regs.bus_assigned &&
++ dev->bus->number == fake_cb_bridge_regs.cardbus_busn &&
++ PCI_SLOT(dev->devfn) == 0)
++ new_io_window = 1;
++ else
++ new_io_window = 0;
++
++ if (new_io_window == io_window)
++ return;
++
++ if (io_window != -1) {
++ printk(KERN_ERR "bcm63xx: both PCI and cardbus devices "
++ "need IO, which hardware cannot do\n");
++ return;
++ }
++
++ printk(KERN_INFO "bcm63xx: PCI IO window assigned to %s\n",
++ (new_io_window == 0) ? "PCI" : "cardbus");
++
++ val = bcm_mpi_readl(MPI_L2PIOREMAP_REG);
++ if (io_window)
++ val |= MPI_L2PREMAP_IS_CARDBUS_MASK;
++ else
++ val &= ~MPI_L2PREMAP_IS_CARDBUS_MASK;
++ bcm_mpi_writel(val, MPI_L2PIOREMAP_REG);
++
++ io_window = new_io_window;
++}
++
++DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, bcm63xx_fixup);
++#endif
+diff --git a/arch/mips/pci/pci-bcm63xx.c b/arch/mips/pci/pci-bcm63xx.c
+index 52bac8e..601700d 100644
+--- a/arch/mips/pci/pci-bcm63xx.c
++++ b/arch/mips/pci/pci-bcm63xx.c
+@@ -28,7 +28,11 @@ static struct resource bcm_pci_mem_resource = {
+ static struct resource bcm_pci_io_resource = {
+ .name = "bcm63xx PCI IO space",
+ .start = BCM_PCI_IO_BASE_PA,
++#ifdef CONFIG_CARDBUS
++ .end = BCM_PCI_IO_HALF_PA,
++#else
+ .end = BCM_PCI_IO_END_PA,
++#endif
+ .flags = IORESOURCE_IO
+ };
+
+@@ -38,6 +42,33 @@ struct pci_controller bcm63xx_controller = {
+ .mem_resource = &bcm_pci_mem_resource,
+ };
+
++/*
++ * We handle cardbus via a fake Cardbus bridge, memory and io spaces
++ * have to be clearly separated from PCI one since we have different
++ * memory decoder.
++ */
++#ifdef CONFIG_CARDBUS
++static struct resource bcm_cb_mem_resource = {
++ .name = "bcm63xx Cardbus memory space",
++ .start = BCM_CB_MEM_BASE_PA,
++ .end = BCM_CB_MEM_END_PA,
++ .flags = IORESOURCE_MEM
++};
++
++static struct resource bcm_cb_io_resource = {
++ .name = "bcm63xx Cardbus IO space",
++ .start = BCM_PCI_IO_HALF_PA + 1,
++ .end = BCM_PCI_IO_END_PA,
++ .flags = IORESOURCE_IO
++};
++
++struct pci_controller bcm63xx_cb_controller = {
++ .pci_ops = &bcm63xx_cb_ops,
++ .io_resource = &bcm_cb_io_resource,
++ .mem_resource = &bcm_cb_mem_resource,
++};
++#endif
++
+ static u32 bcm63xx_int_cfg_readl(u32 reg)
+ {
+ u32 tmp;
+@@ -98,8 +129,17 @@ static int __init bcm63xx_pci_init(void)
+ val |= (CARDBUS_PCI_IDSEL << PCMCIA_C1_CBIDSEL_SHIFT);
+ bcm_pcmcia_writel(val, PCMCIA_C1_REG);
+
++#ifdef CONFIG_CARDBUS
++ /* setup local bus to PCI access (Cardbus memory) */
++ val = BCM_CB_MEM_BASE_PA & MPI_L2P_BASE_MASK;
++ bcm_mpi_writel(val, MPI_L2PMEMBASE2_REG);
++ bcm_mpi_writel(~(BCM_CB_MEM_SIZE - 1), MPI_L2PMEMRANGE2_REG);
++ val |= MPI_L2PREMAP_ENABLED_MASK | MPI_L2PREMAP_IS_CARDBUS_MASK;
++ bcm_mpi_writel(val, MPI_L2PMEMREMAP2_REG);
++#else
+ /* disable second access windows */
+ bcm_mpi_writel(0, MPI_L2PMEMREMAP2_REG);
++#endif
+
+ /* setup local bus to PCI access (IO memory), we have only 1
+ * IO window for both PCI and cardbus, but it cannot handle
+@@ -169,6 +209,10 @@ static int __init bcm63xx_pci_init(void)
+
+ register_pci_controller(&bcm63xx_controller);
+
++#ifdef CONFIG_CARDBUS
++ register_pci_controller(&bcm63xx_cb_controller);
++#endif
++
+ /* mark memory space used for IO mapping as reserved */
+ request_mem_region(BCM_PCI_IO_BASE_PA, BCM_PCI_IO_SIZE,
+ "bcm63xx PCI IO space");
+--
+1.5.4.3
+
projects / openwrt / openwrt.git / blobdiff