bcma: add mips driver

This adds a mips driver to bcma. This is only found on embedded
devices. For now the driver just initializes the irqs used on this
system.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 268 insertions, 0 deletions

diff --git a/drivers/bcma/Kconfig b/drivers/bcma/Kconfig
index 4a062f858e7a..c1172dafdffa 100644
--- a/drivers/bcma/Kconfig
+++ b/drivers/bcma/Kconfig
@@ -35,7 +35,16 @@ config BCMA_DRIVER_PCI_HOSTMODE
 
 config BCMA_HOST_SOC
         bool
+        depends on BCMA_DRIVER_MIPS
+
+config BCMA_DRIVER_MIPS
+        bool "BCMA Broadcom MIPS core driver"
         depends on BCMA && MIPS
+        help
+          Driver for the Broadcom MIPS core attached to Broadcom specific
+          Advanced Microcontroller Bus.
+
+          If unsure, say N
 
 config BCMA_DEBUG
         bool "BCMA debugging"
diff --git a/drivers/bcma/Makefile b/drivers/bcma/Makefile
index 8dc730de7786..82de24e5340c 100644
--- a/drivers/bcma/Makefile
+++ b/drivers/bcma/Makefile
@@ -2,6 +2,7 @@ bcma-y					+= main.o scan.o core.o sprom.o
 bcma-y                                  += driver_chipcommon.o driver_chipcommon_pmu.o
 bcma-y                                  += driver_pci.o
 bcma-$(CONFIG_BCMA_DRIVER_PCI_HOSTMODE) += driver_pci_host.o
+bcma-$(CONFIG_BCMA_DRIVER_MIPS)         += driver_mips.o
 bcma-$(CONFIG_BCMA_HOST_PCI)            += host_pci.o
 bcma-$(CONFIG_BCMA_HOST_SOC)            += host_soc.o
 obj-$(CONFIG_BCMA)                      += bcma.o
diff --git a/drivers/bcma/driver_mips.c b/drivers/bcma/driver_mips.c
new file mode 100644
index 000000000000..4b60c9f95839
--- /dev/null
+++ b/drivers/bcma/driver_mips.c
@@ -0,0 +1,243 @@
+/*
+ * Broadcom specific AMBA
+ * Broadcom MIPS32 74K core driver
+ *
+ * Copyright 2009, Broadcom Corporation
+ * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
+ * Copyright 2010, Bernhard Loos <bernhardloos@googlemail.com>
+ * Copyright 2011, Hauke Mehrtens <hauke@hauke-m.de>
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+
+#include "bcma_private.h"
+
+#include <linux/bcma/bcma.h>
+
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/serial_reg.h>
+#include <linux/time.h>
+
+/* The 47162a0 hangs when reading MIPS DMP registers registers */
+static inline bool bcma_core_mips_bcm47162a0_quirk(struct bcma_device *dev)
+{
+        return dev->bus->chipinfo.id == 47162 && dev->bus->chipinfo.rev == 0 &&
+               dev->id.id == BCMA_CORE_MIPS_74K;
+}
+
+/* The 5357b0 hangs when reading USB20H DMP registers */
+static inline bool bcma_core_mips_bcm5357b0_quirk(struct bcma_device *dev)
+{
+        return (dev->bus->chipinfo.id == 0x5357 ||
+                dev->bus->chipinfo.id == 0x4749) &&
+               dev->bus->chipinfo.pkg == 11 &&
+               dev->id.id == BCMA_CORE_USB20_HOST;
+}
+
+static inline u32 mips_read32(struct bcma_drv_mips *mcore,
+                              u16 offset)
+{
+        return bcma_read32(mcore->core, offset);
+}
+
+static inline void mips_write32(struct bcma_drv_mips *mcore,
+                                u16 offset,
+                                u32 value)
+{
+        bcma_write32(mcore->core, offset, value);
+}
+
+static const u32 ipsflag_irq_mask[] = {
+        0,
+        BCMA_MIPS_IPSFLAG_IRQ1,
+        BCMA_MIPS_IPSFLAG_IRQ2,
+        BCMA_MIPS_IPSFLAG_IRQ3,
+        BCMA_MIPS_IPSFLAG_IRQ4,
+};
+
+static const u32 ipsflag_irq_shift[] = {
+        0,
+        BCMA_MIPS_IPSFLAG_IRQ1_SHIFT,
+        BCMA_MIPS_IPSFLAG_IRQ2_SHIFT,
+        BCMA_MIPS_IPSFLAG_IRQ3_SHIFT,
+        BCMA_MIPS_IPSFLAG_IRQ4_SHIFT,
+};
+
+static u32 bcma_core_mips_irqflag(struct bcma_device *dev)
+{
+        u32 flag;
+
+        if (bcma_core_mips_bcm47162a0_quirk(dev))
+                return dev->core_index;
+        if (bcma_core_mips_bcm5357b0_quirk(dev))
+                return dev->core_index;
+        flag = bcma_aread32(dev, BCMA_MIPS_OOBSELOUTA30);
+
+        return flag & 0x1F;
+}
+
+/* Get the MIPS IRQ assignment for a specified device.
+ * If unassigned, 0 is returned.
+ */
+unsigned int bcma_core_mips_irq(struct bcma_device *dev)
+{
+        struct bcma_device *mdev = dev->bus->drv_mips.core;
+        u32 irqflag;
+        unsigned int irq;
+
+        irqflag = bcma_core_mips_irqflag(dev);
+
+        for (irq = 1; irq <= 4; irq++)
+                if (bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq)) &
+                    (1 << irqflag))
+                        return irq;
+
+        return 0;
+}
+EXPORT_SYMBOL(bcma_core_mips_irq);
+
+static void bcma_core_mips_set_irq(struct bcma_device *dev, unsigned int irq)
+{
+        unsigned int oldirq = bcma_core_mips_irq(dev);
+        struct bcma_bus *bus = dev->bus;
+        struct bcma_device *mdev = bus->drv_mips.core;
+        u32 irqflag;
+
+        irqflag = bcma_core_mips_irqflag(dev);
+        BUG_ON(oldirq == 6);
+
+        dev->irq = irq + 2;
+
+        /* clear the old irq */
+        if (oldirq == 0)
+                bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
+                            bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) &
+                            ~(1 << irqflag));
+        else
+                bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq), 0);
+
+        /* assign the new one */
+        if (irq == 0) {
+                bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
+                            bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) |
+                            (1 << irqflag));
+        } else {
+                u32 oldirqflag = bcma_read32(mdev,
+                                             BCMA_MIPS_MIPS74K_INTMASK(irq));
+                if (oldirqflag) {
+                        struct bcma_device *core;
+
+                        /* backplane irq line is in use, find out who uses
+                         * it and set user to irq 0
+                         */
+                        list_for_each_entry_reverse(core, &bus->cores, list) {
+                                if ((1 << bcma_core_mips_irqflag(core)) ==
+                                    oldirqflag) {
+                                        bcma_core_mips_set_irq(core, 0);
+                                        break;
+                                }
+                        }
+                }
+                bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq),
+                             1 << irqflag);
+        }
+
+        pr_info("set_irq: core 0x%04x, irq %d => %d\n",
+                dev->id.id, oldirq + 2, irq + 2);
+}
+
+static void bcma_core_mips_print_irq(struct bcma_device *dev, unsigned int irq)
+{
+        int i;
+        static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
+        printk(KERN_INFO KBUILD_MODNAME ": core 0x%04x, irq :", dev->id.id);
+        for (i = 0; i <= 6; i++)
+                printk(" %s%s", irq_name[i], i == irq ? "*" : " ");
+        printk("\n");
+}
+
+static void bcma_core_mips_dump_irq(struct bcma_bus *bus)
+{
+        struct bcma_device *core;
+
+        list_for_each_entry_reverse(core, &bus->cores, list) {
+                bcma_core_mips_print_irq(core, bcma_core_mips_irq(core));
+        }
+}
+
+static void bcma_core_mips_flash_detect(struct bcma_drv_mips *mcore)
+{
+        struct bcma_bus *bus = mcore->core->bus;
+
+        switch (bus->drv_cc.capabilities & BCMA_CC_CAP_FLASHT) {
+        case BCMA_CC_FLASHT_STSER:
+        case BCMA_CC_FLASHT_ATSER:
+                pr_err("Serial flash not supported.\n");
+                break;
+        case BCMA_CC_FLASHT_PARA:
+                pr_info("found parallel flash.\n");
+                bus->drv_cc.pflash.window = 0x1c000000;
+                bus->drv_cc.pflash.window_size = 0x02000000;
+
+                if ((bcma_read32(bus->drv_cc.core, BCMA_CC_FLASH_CFG) &
+                     BCMA_CC_FLASH_CFG_DS) == 0)
+                        bus->drv_cc.pflash.buswidth = 1;
+                else
+                        bus->drv_cc.pflash.buswidth = 2;
+                break;
+        default:
+                pr_err("flash not supported.\n");
+        }
+}
+
+void bcma_core_mips_init(struct bcma_drv_mips *mcore)
+{
+        struct bcma_bus *bus;
+        struct bcma_device *core;
+        bus = mcore->core->bus;
+
+        pr_info("Initializing MIPS core...\n");
+
+        if (!mcore->setup_done)
+                mcore->assigned_irqs = 1;
+
+        /* Assign IRQs to all cores on the bus */
+        list_for_each_entry_reverse(core, &bus->cores, list) {
+                int mips_irq;
+                if (core->irq)
+                        continue;
+
+                mips_irq = bcma_core_mips_irq(core);
+                if (mips_irq > 4)
+                        core->irq = 0;
+                else
+                        core->irq = mips_irq + 2;
+                if (core->irq > 5)
+                        continue;
+                switch (core->id.id) {
+                case BCMA_CORE_PCI:
+                case BCMA_CORE_PCIE:
+                case BCMA_CORE_ETHERNET:
+                case BCMA_CORE_ETHERNET_GBIT:
+                case BCMA_CORE_MAC_GBIT:
+                case BCMA_CORE_80211:
+                case BCMA_CORE_USB20_HOST:
+                        /* These devices get their own IRQ line if available,
+                         * the rest goes on IRQ0
+                         */
+                        if (mcore->assigned_irqs <= 4)
+                                bcma_core_mips_set_irq(core,
+                                                       mcore->assigned_irqs++);
+                        break;
+                }
+        }
+        pr_info("IRQ reconfiguration done\n");
+        bcma_core_mips_dump_irq(bus);
+
+        if (mcore->setup_done)
+                return;
+
+        bcma_core_mips_flash_detect(mcore);
+        mcore->setup_done = true;
+}
diff --git a/drivers/bcma/main.c b/drivers/bcma/main.c
index 2648522432be..7072216a2a3f 100644
--- a/drivers/bcma/main.c
+++ b/drivers/bcma/main.c
@@ -84,6 +84,7 @@ static int bcma_register_cores(struct bcma_bus *bus)
                 case BCMA_CORE_CHIPCOMMON:
                 case BCMA_CORE_PCI:
                 case BCMA_CORE_PCIE:
+                case BCMA_CORE_MIPS_74K:
                         continue;
                 }
 
@@ -147,6 +148,13 @@ int bcma_bus_register(struct bcma_bus *bus)
                 bcma_core_chipcommon_init(&bus->drv_cc);
         }
 
+        /* Init MIPS core */
+        core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
+        if (core) {
+                bus->drv_mips.core = core;
+                bcma_core_mips_init(&bus->drv_mips);
+        }
+
         /* Init PCIE core */
         core = bcma_find_core(bus, BCMA_CORE_PCIE);
         if (core) {
@@ -217,6 +225,13 @@ int __init bcma_bus_early_register(struct bcma_bus *bus,
                 bcma_core_chipcommon_init(&bus->drv_cc);
         }
 
+        /* Init MIPS core */
+        core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
+        if (core) {
+                bus->drv_mips.core = core;
+                bcma_core_mips_init(&bus->drv_mips);
+        }
+
         pr_info("Early bus registered\n");
 
         return 0;