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[RFC v3 05/13] bcma: add mips driver

To: linux-wireless@vger.kernel.org, zajec5@gmail.com, linux-mips@linux-mips.org
Subject: [RFC v3 05/13] bcma: add mips driver
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Thu, 30 Jun 2011 00:11:50 +0200
Cc: mb@bu3sch.de, george@znau.edu.ua, arend@broadcom.com, b43-dev@lists.infradead.org, bernhardloos@googlemail.com, arnd@arndb.de, julian.calaby@gmail.com, sshtylyov@mvista.com, Hauke Mehrtens <hauke@hauke-m.de>
In-reply-to: <1309385518-12097-1-git-send-email-hauke@hauke-m.de>
References: <1309385518-12097-1-git-send-email-hauke@hauke-m.de>
Sender: linux-mips-bounce@linux-mips.org
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>
---
 drivers/bcma/Kconfig                  |   11 ++-
 drivers/bcma/Makefile                 |    1 +
 drivers/bcma/driver_mips.c            |  233 +++++++++++++++++++++++++++++++++
 drivers/bcma/main.c                   |   19 +++
 include/linux/bcma/bcma.h             |    2 +
 include/linux/bcma/bcma_driver_mips.h |   49 +++++++
 6 files changed, 314 insertions(+), 1 deletions(-)
 create mode 100644 drivers/bcma/driver_mips.c
 create mode 100644 include/linux/bcma/bcma_driver_mips.h

diff --git a/drivers/bcma/Kconfig b/drivers/bcma/Kconfig
index fc5c02f..0bd0a26 100644
--- a/drivers/bcma/Kconfig
+++ b/drivers/bcma/Kconfig
@@ -29,9 +29,18 @@ config BCMA_HOST_PCI
 
 config BCMA_HOST_SOC
        bool
-       depends on BCMA && MIPS
+       depends on BCMA_DRIVER_MIPS
        default n
 
+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"
        depends on BCMA
diff --git a/drivers/bcma/Makefile b/drivers/bcma/Makefile
index e2aaa41..3bb24f5 100644
--- a/drivers/bcma/Makefile
+++ b/drivers/bcma/Makefile
@@ -1,6 +1,7 @@
 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-$(CONFIG_BCMA_DRIVER_MIPS)                += driver_mips.o
 bcma-$(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 0000000..605bb08
--- /dev/null
+++ b/drivers/bcma/driver_mips.c
@@ -0,0 +1,233 @@
+/*
+ * 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 its 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;
+}
+
+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;
+       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;
+
+       mcore->flash_buswidth = 2;
+       if (bus->drv_cc.core) {
+               mcore->flash_window = 0x1c000000;
+               mcore->flash_window_size = 0x02000000;
+               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:
+                       if ((bcma_read32(bus->drv_cc.core, BCMA_CC_FLASH_CFG) &
+                            BCMA_CC_OTPS) == 0)
+                               mcore->flash_buswidth = 1;
+                       break;
+               }
+       } else {
+               mcore->flash_window = 0x1fc00000;
+               mcore->flash_window_size = 0x00400000;
+       }
+}
+
+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 58ded75..7dd0b16 100644
--- a/drivers/bcma/main.c
+++ b/drivers/bcma/main.c
@@ -80,6 +80,7 @@ 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;
                }
 
@@ -141,6 +142,15 @@ int bcma_bus_register(struct bcma_bus *bus)
                bcma_core_chipcommon_init(&bus->drv_cc);
        }
 
+#ifdef CONFIG_BCMA_DRIVER_MIPS
+       /* 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);
+       }
+#endif
+
        /* Init PCIE core */
        core = bcma_find_core(bus, BCMA_CORE_PCIE);
        if (core) {
@@ -208,6 +218,15 @@ int __init bcma_bus_early_register(struct bcma_bus *bus,
                bcma_core_chipcommon_init(&bus->drv_cc);
        }
 
+#ifdef CONFIG_BCMA_DRIVER_MIPS
+       /* 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);
+       }
+#endif
+
        pr_info("Early bus registered\n");
 
        return 0;
diff --git a/include/linux/bcma/bcma.h b/include/linux/bcma/bcma.h
index db4ec30..6d962f2 100644
--- a/include/linux/bcma/bcma.h
+++ b/include/linux/bcma/bcma.h
@@ -6,6 +6,7 @@
 
 #include <linux/bcma/bcma_driver_chipcommon.h>
 #include <linux/bcma/bcma_driver_pci.h>
+#include <linux/bcma/bcma_driver_mips.h>
 #include <linux/ssb/ssb.h> /* SPROM sharing */
 
 #include "bcma_regs.h"
@@ -193,6 +194,7 @@ struct bcma_bus {
 
        struct bcma_drv_cc drv_cc;
        struct bcma_drv_pci drv_pci;
+       struct bcma_drv_mips drv_mips;
 
        /* We decided to share SPROM struct with SSB as long as we do not need
         * any hacks for BCMA. This simplifies drivers code. */
diff --git a/include/linux/bcma/bcma_driver_mips.h 
b/include/linux/bcma/bcma_driver_mips.h
new file mode 100644
index 0000000..f19b21a
--- /dev/null
+++ b/include/linux/bcma/bcma_driver_mips.h
@@ -0,0 +1,49 @@
+#ifndef LINUX_BCMA_DRIVER_MIPS_H_
+#define LINUX_BCMA_DRIVER_MIPS_H_
+
+#define BCMA_MIPS_IPSFLAG              0x0F08
+/* which sbflags get routed to mips interrupt 1 */
+#define         BCMA_MIPS_IPSFLAG_IRQ1         0x0000003F
+#define         BCMA_MIPS_IPSFLAG_IRQ1_SHIFT   0
+/* which sbflags get routed to mips interrupt 2 */
+#define         BCMA_MIPS_IPSFLAG_IRQ2         0x00003F00
+#define         BCMA_MIPS_IPSFLAG_IRQ2_SHIFT   8
+/* which sbflags get routed to mips interrupt 3 */
+#define         BCMA_MIPS_IPSFLAG_IRQ3         0x003F0000
+#define         BCMA_MIPS_IPSFLAG_IRQ3_SHIFT   16
+/* which sbflags get routed to mips interrupt 4 */
+#define         BCMA_MIPS_IPSFLAG_IRQ4         0x3F000000
+#define         BCMA_MIPS_IPSFLAG_IRQ4_SHIFT   24
+
+/* MIPS 74K core registers */
+#define BCMA_MIPS_MIPS74K_CORECTL      0x0000
+#define BCMA_MIPS_MIPS74K_EXCEPTBASE   0x0004
+#define BCMA_MIPS_MIPS74K_BIST         0x000C
+#define BCMA_MIPS_MIPS74K_INTMASK_INT0 0x0014
+#define BCMA_MIPS_MIPS74K_INTMASK(int) \
+       ((int) * 4 + BCMA_MIPS_MIPS74K_INTMASK_INT0)
+#define BCMA_MIPS_MIPS74K_NMIMASK      0x002C
+#define BCMA_MIPS_MIPS74K_GPIOSEL      0x0040
+#define BCMA_MIPS_MIPS74K_GPIOOUT      0x0044
+#define BCMA_MIPS_MIPS74K_GPIOEN       0x0048
+#define BCMA_MIPS_MIPS74K_CLKCTLST     0x01E0
+
+#define BCMA_MIPS_OOBSELOUTA30         0x100
+
+struct bcma_device;
+
+struct bcma_drv_mips {
+       struct bcma_device *core;
+       u8 setup_done:1;
+       unsigned int assigned_irqs;
+
+       u8 flash_buswidth;
+       u32 flash_window;
+       u32 flash_window_size;
+};
+
+extern void bcma_core_mips_init(struct bcma_drv_mips *mcore);
+
+extern unsigned int bcma_core_mips_irq(struct bcma_device *dev);
+
+#endif /* LINUX_BCMA_DRIVER_MIPS_H_ */
-- 
1.7.4.1


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