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@xxxxxxxxxx>
---
drivers/bcma/Kconfig | 11 ++-
drivers/bcma/Makefile | 1 +
drivers/bcma/driver_mips.c | 233 +++++++++++++++++++++++++++++++++
drivers/bcma/main.c | 19 +++
include/linux/bcma/bcma.h | 3 +
include/linux/bcma/bcma_driver_mips.h | 49 +++++++
6 files changed, 315 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 8d82f42..81926ce 100644
--- a/drivers/bcma/Kconfig
+++ b/drivers/bcma/Kconfig
@@ -24,9 +24,18 @@ 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 42d61dd..a4352e5 100644
--- a/drivers/bcma/Makefile
+++ b/drivers/bcma/Makefile
@@ -1,6 +1,7 @@
bcma-y += main.o scan.o core.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@xxxxxxxxx>
+ * Copyright 2010, Bernhard Loos <bernhardloos@xxxxxxxxxxxxxx>
+ * Copyright 2011, Hauke Mehrtens <hauke@xxxxxxxxxx>
+ *
+ * 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 2ca5eeb..ba9a357 100644
--- a/drivers/bcma/main.c
+++ b/drivers/bcma/main.c
@@ -79,6 +79,7 @@ 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;
}
@@ -138,6 +139,15 @@ 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) {
@@ -200,6 +210,15 @@ 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 73fda1c..12313fd 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 "bcma_regs.h"
@@ -118,6 +119,7 @@ struct bcma_device {
struct bcma_device_id id;
struct device dev;
+ unsigned int irq;
bool dev_registered;
u8 core_index;
@@ -184,6 +186,7 @@ struct bcma_bus {
struct bcma_drv_cc drv_cc;
struct bcma_drv_pci drv_pci;
+ struct bcma_drv_mips drv_mips;
};
extern inline u32 bcma_read8(struct bcma_device *core, u16 offset)
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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