MIPS: Add Cavium OCTEON processor support files to arch/mips/cavium-octeon.

These are the rest of the new files needed to add OCTEON processor
support to the Linux kernel.  Other than Makefile and Kconfig which
should be obvious, we have:

csrc-octeon.c   -- Clock source driver for OCTEON.
dma-octeon.c    -- Helper functions for mapping DMA memory.
flash_setup.c   -- Register on-board flash with the MTD subsystem.
octeon-irq.c    -- OCTEON interrupt controller managment.
octeon-memcpy.S -- Optimized memcpy() implementation.
serial.c        -- Register 8250 platform driver and early console.
setup.c         -- Early architecture initialization.
smp.c           -- OCTEON SMP support.
octeon_switch.S -- Scheduler context switch for OCTEON.
c-octeon.c      -- OCTEON cache controller support.
cex-oct.S       -- OCTEON cache exception handler.

asm/mach-cavium-octeon/*.h -- Architecture include files.

Signed-off-by: Tomaso Paoletti <tpaoletti@caviumnetworks.com>
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

 create mode 100644 arch/mips/cavium-octeon/Kconfig
 create mode 100644 arch/mips/cavium-octeon/Makefile
 create mode 100644 arch/mips/cavium-octeon/csrc-octeon.c
 create mode 100644 arch/mips/cavium-octeon/dma-octeon.c
 create mode 100644 arch/mips/cavium-octeon/flash_setup.c
 create mode 100644 arch/mips/cavium-octeon/octeon-irq.c
 create mode 100644 arch/mips/cavium-octeon/octeon-memcpy.S
 create mode 100644 arch/mips/cavium-octeon/serial.c
 create mode 100644 arch/mips/cavium-octeon/setup.c
 create mode 100644 arch/mips/cavium-octeon/smp.c
 create mode 100644 arch/mips/include/asm/mach-cavium-octeon/cpu-feature-overrides.h
 create mode 100644 arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
 create mode 100644 arch/mips/include/asm/mach-cavium-octeon/irq.h
 create mode 100644 arch/mips/include/asm/mach-cavium-octeon/kernel-entry-init.h
 create mode 100644 arch/mips/include/asm/mach-cavium-octeon/war.h
 create mode 100644 arch/mips/include/asm/octeon/octeon.h
 create mode 100644 arch/mips/kernel/octeon_switch.S
 create mode 100644 arch/mips/mm/c-octeon.c
 create mode 100644 arch/mips/mm/cex-oct.S

1 files changed, 211 insertions, 0 deletions

diff --git a/arch/mips/cavium-octeon/smp.c b/arch/mips/cavium-octeon/smp.c
new file mode 100644
index 00000000000..24e0ad63980
--- /dev/null
+++ b/arch/mips/cavium-octeon/smp.c
@@ -0,0 +1,211 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2004-2008 Cavium Networks
+ */
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/smp.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+
+#include <asm/mmu_context.h>
+#include <asm/system.h>
+#include <asm/time.h>
+
+#include <asm/octeon/octeon.h>
+
+volatile unsigned long octeon_processor_boot = 0xff;
+volatile unsigned long octeon_processor_sp;
+volatile unsigned long octeon_processor_gp;
+
+static irqreturn_t mailbox_interrupt(int irq, void *dev_id)
+{
+	const int coreid = cvmx_get_core_num();
+	uint64_t action;
+
+	/* Load the mailbox register to figure out what we're supposed to do */
+	action = cvmx_read_csr(CVMX_CIU_MBOX_CLRX(coreid));
+
+	/* Clear the mailbox to clear the interrupt */
+	cvmx_write_csr(CVMX_CIU_MBOX_CLRX(coreid), action);
+
+	if (action & SMP_CALL_FUNCTION)
+		smp_call_function_interrupt();
+
+	/* Check if we've been told to flush the icache */
+	if (action & SMP_ICACHE_FLUSH)
+		asm volatile ("synci 0($0)\n");
+	return IRQ_HANDLED;
+}
+
+/**
+ * Cause the function described by call_data to be executed on the passed
+ * cpu.  When the function has finished, increment the finished field of
+ * call_data.
+ */
+void octeon_send_ipi_single(int cpu, unsigned int action)
+{
+	int coreid = cpu_logical_map(cpu);
+	/*
+	pr_info("SMP: Mailbox send cpu=%d, coreid=%d, action=%u\n", cpu,
+	       coreid, action);
+	*/
+	cvmx_write_csr(CVMX_CIU_MBOX_SETX(coreid), action);
+}
+
+static inline void octeon_send_ipi_mask(cpumask_t mask, unsigned int action)
+{
+	unsigned int i;
+
+	for_each_cpu_mask(i, mask)
+		octeon_send_ipi_single(i, action);
+}
+
+/**
+ * Detect available CPUs, populate phys_cpu_present_map
+ */
+static void octeon_smp_setup(void)
+{
+	const int coreid = cvmx_get_core_num();
+	int cpus;
+	int id;
+
+	int core_mask = octeon_get_boot_coremask();
+
+	cpus_clear(cpu_possible_map);
+	__cpu_number_map[coreid] = 0;
+	__cpu_logical_map[0] = coreid;
+	cpu_set(0, cpu_possible_map);
+
+	cpus = 1;
+	for (id = 0; id < 16; id++) {
+		if ((id != coreid) && (core_mask & (1 << id))) {
+			cpu_set(cpus, cpu_possible_map);
+			__cpu_number_map[id] = cpus;
+			__cpu_logical_map[cpus] = id;
+			cpus++;
+		}
+	}
+}
+
+/**
+ * Firmware CPU startup hook
+ *
+ */
+static void octeon_boot_secondary(int cpu, struct task_struct *idle)
+{
+	int count;
+
+	pr_info("SMP: Booting CPU%02d (CoreId %2d)...\n", cpu,
+		cpu_logical_map(cpu));
+
+	octeon_processor_sp = __KSTK_TOS(idle);
+	octeon_processor_gp = (unsigned long)(task_thread_info(idle));
+	octeon_processor_boot = cpu_logical_map(cpu);
+	mb();
+
+	count = 10000;
+	while (octeon_processor_sp && count) {
+		/* Waiting for processor to get the SP and GP */
+		udelay(1);
+		count--;
+	}
+	if (count == 0)
+		pr_err("Secondary boot timeout\n");
+}
+
+/**
+ * After we've done initial boot, this function is called to allow the
+ * board code to clean up state, if needed
+ */
+static void octeon_init_secondary(void)
+{
+	const int coreid = cvmx_get_core_num();
+	union cvmx_ciu_intx_sum0 interrupt_enable;
+
+	octeon_check_cpu_bist();
+	octeon_init_cvmcount();
+	/*
+	pr_info("SMP: CPU%d (CoreId %lu) started\n", cpu, coreid);
+	*/
+	/* Enable Mailbox interrupts to this core. These are the only
+	   interrupts allowed on line 3 */
+	cvmx_write_csr(CVMX_CIU_MBOX_CLRX(coreid), 0xffffffff);
+	interrupt_enable.u64 = 0;
+	interrupt_enable.s.mbox = 0x3;
+	cvmx_write_csr(CVMX_CIU_INTX_EN0((coreid * 2)), interrupt_enable.u64);
+	cvmx_write_csr(CVMX_CIU_INTX_EN0((coreid * 2 + 1)), 0);
+	cvmx_write_csr(CVMX_CIU_INTX_EN1((coreid * 2)), 0);
+	cvmx_write_csr(CVMX_CIU_INTX_EN1((coreid * 2 + 1)), 0);
+	/* Enable core interrupt processing for 2,3 and 7 */
+	set_c0_status(0x8c01);
+}
+
+/**
+ * Callout to firmware before smp_init
+ *
+ */
+void octeon_prepare_cpus(unsigned int max_cpus)
+{
+	cvmx_write_csr(CVMX_CIU_MBOX_CLRX(cvmx_get_core_num()), 0xffffffff);
+	if (request_irq(OCTEON_IRQ_MBOX0, mailbox_interrupt, IRQF_SHARED,
+			"mailbox0", mailbox_interrupt)) {
+		panic("Cannot request_irq(OCTEON_IRQ_MBOX0)\n");
+	}
+	if (request_irq(OCTEON_IRQ_MBOX1, mailbox_interrupt, IRQF_SHARED,
+			"mailbox1", mailbox_interrupt)) {
+		panic("Cannot request_irq(OCTEON_IRQ_MBOX1)\n");
+	}
+}
+
+/**
+ * Last chance for the board code to finish SMP initialization before
+ * the CPU is "online".
+ */
+static void octeon_smp_finish(void)
+{
+#ifdef CONFIG_CAVIUM_GDB
+	unsigned long tmp;
+	/* Pulse MCD0 signal on Ctrl-C to stop all the cores. Also set the MCD0
+	   to be not masked by this core so we know the signal is received by
+	   someone */
+	asm volatile ("dmfc0 %0, $22\n"
+		      "ori   %0, %0, 0x9100\n" "dmtc0 %0, $22\n" : "=r" (tmp));
+#endif
+
+	octeon_user_io_init();
+
+	/* to generate the first CPU timer interrupt */
+	write_c0_compare(read_c0_count() + mips_hpt_frequency / HZ);
+}
+
+/**
+ * Hook for after all CPUs are online
+ */
+static void octeon_cpus_done(void)
+{
+#ifdef CONFIG_CAVIUM_GDB
+	unsigned long tmp;
+	/* Pulse MCD0 signal on Ctrl-C to stop all the cores. Also set the MCD0
+	   to be not masked by this core so we know the signal is received by
+	   someone */
+	asm volatile ("dmfc0 %0, $22\n"
+		      "ori   %0, %0, 0x9100\n" "dmtc0 %0, $22\n" : "=r" (tmp));
+#endif
+}
+
+struct plat_smp_ops octeon_smp_ops = {
+	.send_ipi_single	= octeon_send_ipi_single,
+	.send_ipi_mask		= octeon_send_ipi_mask,
+	.init_secondary		= octeon_init_secondary,
+	.smp_finish		= octeon_smp_finish,
+	.cpus_done		= octeon_cpus_done,
+	.boot_secondary		= octeon_boot_secondary,
+	.smp_setup		= octeon_smp_setup,
+	.prepare_cpus		= octeon_prepare_cpus,
+};