ARC: [arcfpga] RIP legacy ISS based SMP extension

With ISS long unsupported, no point in having extension based on it

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

5 files changed, 0 insertions, 329 deletions

diff --git a/arch/arc/plat-arcfpga/Kconfig b/arch/arc/plat-arcfpga/Kconfig
index 217593a70751..043bac36f34f 100644
--- a/arch/arc/plat-arcfpga/Kconfig
+++ b/arch/arc/plat-arcfpga/Kconfig
@@ -14,20 +14,3 @@ menuconfig ARC_PLAT_FPGA_LEGACY
 	  These are based on FPGA or ISS. e.g.
 	  - ARCAngel4
 	  - ML509
-	  - MetaWare ISS
-
-if ARC_PLAT_FPGA_LEGACY
-
-config ISS_SMP_EXTN
-	bool "ARC SMP Extensions (ISS Models only)"
-	default n
-	depends on SMP
-	help
-	  SMP Extensions to ARC700, in a "simulation only" Model, supported in
-	  ARC ISS (Instruction Set Simulator).
-	  The SMP extensions include:
-	  -IDU (Interrupt Distribution Unit)
-	  -XTL (To enable CPU start/stop/set-PC for another CPU)
-	  It doesn't provide coherent Caches and/or Atomic Ops (LLOCK/SCOND)
-
-endif
diff --git a/arch/arc/plat-arcfpga/Makefile b/arch/arc/plat-arcfpga/Makefile
index 66fd0ecd68b3..00b1a958cec7 100644
--- a/arch/arc/plat-arcfpga/Makefile
+++ b/arch/arc/plat-arcfpga/Makefile
@@ -6,7 +6,4 @@
 # published by the Free Software Foundation.
 #
 
-KBUILD_CFLAGS	+= -Iarch/arc/plat-arcfpga/include
-
 obj-y := platform.o
-obj-$(CONFIG_ISS_SMP_EXTN)		+= smp.o
diff --git a/arch/arc/plat-arcfpga/include/plat/smp.h b/arch/arc/plat-arcfpga/include/plat/smp.h
deleted file mode 100644
index c09eb4cfc77c..000000000000
--- a/arch/arc/plat-arcfpga/include/plat/smp.h
+++ /dev/null
@@ -1,118 +0,0 @@
-/*
- * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- *  Rajeshwar Ranga: Interrupt Distribution Unit API's
- */
-
-#ifndef __PLAT_ARCFPGA_SMP_H
-#define __PLAT_ARCFPGA_SMP_H
-
-#ifdef CONFIG_SMP
-
-#include <linux/types.h>
-#include <asm/arcregs.h>
-
-#define ARC_AUX_IDU_REG_CMD		0x2000
-#define ARC_AUX_IDU_REG_PARAM		0x2001
-
-#define ARC_AUX_XTL_REG_CMD		0x2002
-#define ARC_AUX_XTL_REG_PARAM		0x2003
-
-#define ARC_REG_MP_BCR			0x2021
-
-#define ARC_XTL_CMD_WRITE_PC		0x04
-#define ARC_XTL_CMD_CLEAR_HALT		0x02
-
-/*
- * Build Configuration Register which identifies the sub-components
- */
-struct bcr_mp {
-#ifdef CONFIG_CPU_BIG_ENDIAN
-	unsigned int mp_arch:16, pad:5, sdu:1, idu:1, scu:1, ver:8;
-#else
-	unsigned int ver:8, scu:1, idu:1, sdu:1, pad:5, mp_arch:16;
-#endif
-};
-
-/* IDU supports 256 common interrupts */
-#define NR_IDU_IRQS			256
-
-/*
- * The Aux Regs layout is same bit-by-bit in both BE/LE modes.
- * However when casted as a bitfield encoded "C" struct, gcc treats it as
- * memory, generating different code for BE/LE, requiring strcture adj (see
- * include/asm/arcregs.h)
- *
- * However when manually "carving" the value for a Aux, no special handling
- * of BE is needed because of the property discribed above
- */
-#define IDU_SET_COMMAND(irq, cmd)			\
-do {							\
-	uint32_t __val;					\
-	__val = (((irq & 0xFF) << 8) | (cmd & 0xFF));	\
-	write_aux_reg(ARC_AUX_IDU_REG_CMD, __val);	\
-} while (0)
-
-#define IDU_SET_PARAM(par)  write_aux_reg(ARC_AUX_IDU_REG_PARAM, par)
-#define IDU_GET_PARAM()     read_aux_reg(ARC_AUX_IDU_REG_PARAM)
-
-/* IDU Commands */
-#define IDU_DISABLE			0x00
-#define IDU_ENABLE			0x01
-#define IDU_IRQ_CLEAR			0x02
-#define IDU_IRQ_ASSERT			0x03
-#define IDU_IRQ_WMODE			0x04
-#define IDU_IRQ_STATUS			0x05
-#define IDU_IRQ_ACK			0x06
-#define IDU_IRQ_PEND			0x07
-#define IDU_IRQ_RMODE			0x08
-#define IDU_IRQ_WBITMASK		0x09
-#define IDU_IRQ_RBITMASK		0x0A
-
-#define idu_enable()		IDU_SET_COMMAND(0, IDU_ENABLE)
-#define idu_disable()		IDU_SET_COMMAND(0, IDU_DISABLE)
-
-#define idu_irq_assert(irq)	IDU_SET_COMMAND((irq), IDU_IRQ_ASSERT)
-#define idu_irq_clear(irq)	IDU_SET_COMMAND((irq), IDU_IRQ_CLEAR)
-
-/* IDU Interrupt Mode - Destination Encoding */
-#define IDU_IRQ_MOD_DISABLE		0x00
-#define IDU_IRQ_MOD_ROUND_RECP		0x01
-#define IDU_IRQ_MOD_TCPU_FIRSTRECP	0x02
-#define IDU_IRQ_MOD_TCPU_ALLRECP	0x03
-
-/* IDU Interrupt Mode  - Triggering Mode */
-#define IDU_IRQ_MODE_LEVEL_TRIG		0x00
-#define IDU_IRQ_MODE_PULSE_TRIG		0x01
-
-#define IDU_IRQ_MODE_PARAM(dest_mode, trig_mode)   \
-	(((trig_mode & 0x01) << 15) | (dest_mode & 0xFF))
-
-struct idu_irq_config {
-	uint8_t irq;
-	uint8_t dest_mode;
-	uint8_t trig_mode;
-};
-
-struct idu_irq_status {
-	uint8_t irq;
-	bool enabled;
-	bool status;
-	bool ack;
-	bool pend;
-	uint8_t next_rr;
-};
-
-extern void idu_irq_set_tgtcpu(uint8_t irq, uint32_t mask);
-extern void idu_irq_set_mode(uint8_t irq, uint8_t dest_mode, uint8_t trig_mode);
-
-extern void iss_model_init_smp(unsigned int cpu);
-extern void iss_model_init_early_smp(void);
-
-#endif	/* CONFIG_SMP */
-
-#endif
diff --git a/arch/arc/plat-arcfpga/platform.c b/arch/arc/plat-arcfpga/platform.c
index afc88254acc1..c79a05c47ebd 100644
--- a/arch/arc/plat-arcfpga/platform.c
+++ b/arch/arc/plat-arcfpga/platform.c
@@ -10,7 +10,6 @@
 
 #include <linux/init.h>
 #include <asm/mach_desc.h>
-#include <plat/smp.h>
 
 /*----------------------- Machine Descriptions ------------------------------
  *
@@ -28,10 +27,6 @@ static const char *legacy_fpga_compat[] __initconst = {
 
 MACHINE_START(LEGACY_FPGA, "legacy_fpga")
 	.dt_compat	= legacy_fpga_compat,
-#ifdef CONFIG_ISS_SMP_EXTN
-	.init_early	= iss_model_init_early_smp,
-	.init_smp	= iss_model_init_smp,
-#endif
 MACHINE_END
 
 static const char *simulation_compat[] __initconst = {
diff --git a/arch/arc/plat-arcfpga/smp.c b/arch/arc/plat-arcfpga/smp.c
deleted file mode 100644
index 64797ba3bbe3..000000000000
--- a/arch/arc/plat-arcfpga/smp.c
+++ /dev/null
@@ -1,186 +0,0 @@
-/*
- * ARC700 Simulation-only Extensions for SMP
- *
- * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- *  Vineet Gupta    - 2012 : split off arch common and plat specific SMP
- *  Rajeshwar Ranga - 2007 : Interrupt Distribution Unit API's
- */
-
-#include <linux/smp.h>
-#include <linux/irq.h>
-#include <plat/smp.h>
-
-#define IDU_INTERRUPT_0 16
-
-static char smp_cpuinfo_buf[128];
-
-/*
- *-------------------------------------------------------------------
- * Platform specific callbacks expected by arch SMP code
- *-------------------------------------------------------------------
- */
-
-/*
- * Master kick starting another CPU
- */
-static void iss_model_smp_wakeup_cpu(int cpu, unsigned long pc)
-{
-	/* setup the start PC */
-	write_aux_reg(ARC_AUX_XTL_REG_PARAM, pc);
-
-	/* Trigger WRITE_PC cmd for this cpu */
-	write_aux_reg(ARC_AUX_XTL_REG_CMD,
-			(ARC_XTL_CMD_WRITE_PC | (cpu << 8)));
-
-	/* Take the cpu out of Halt */
-	write_aux_reg(ARC_AUX_XTL_REG_CMD,
-			(ARC_XTL_CMD_CLEAR_HALT | (cpu << 8)));
-
-}
-
-static inline int get_hw_config_num_irq(void)
-{
-	uint32_t val = read_aux_reg(ARC_REG_VECBASE_BCR);
-
-	switch (val & 0x03) {
-	case 0:
-		return 16;
-	case 1:
-		return 32;
-	case 2:
-		return 8;
-	default:
-		return 0;
-	}
-
-	return 0;
-}
-
-/*
- * Any SMP specific init any CPU does when it comes up.
- * Here we setup the CPU to enable Inter-Processor-Interrupts
- * Called for each CPU
- * -Master      : init_IRQ()
- * -Other(s)    : start_kernel_secondary()
- */
-void iss_model_init_smp(unsigned int cpu)
-{
-	/* Check if CPU is configured for more than 16 interrupts */
-	if (NR_IRQS <= 16 || get_hw_config_num_irq() <= 16)
-		panic("[arcfpga] IRQ system can't support IDU IPI\n");
-
-	idu_disable();
-
-	/****************************************************************
-	 * IDU provides a set of Common IRQs, each of which can be dynamically
-	 * attached to (1|many|all) CPUs.
-	 * The Common IRQs [0-15] are mapped as CPU pvt [16-31]
-	 *
-	 * Here we use a simple 1:1 mapping:
-	 * A CPU 'x' is wired to Common IRQ 'x'.
-	 * So an IDU ASSERT on IRQ 'x' will trigger Interupt on CPU 'x', which
-	 * makes up for our simple IPI plumbing.
-	 *
-	 * TBD: Have a dedicated multicast IRQ for sending IPIs to all CPUs
-	 *      w/o having to do one-at-a-time
-	 ******************************************************************/
-
-	/*
-	 * Claim an IRQ which would trigger IPI on this CPU.
-	 * In IDU parlance it involves setting up a cpu bitmask for the IRQ
-	 * The bitmap here contains only 1 CPU (self).
-	 */
-	idu_irq_set_tgtcpu(cpu, 0x1 << cpu);
-
-	/* Set the IRQ destination to use the bitmask above */
-	idu_irq_set_mode(cpu, 7, /* XXX: IDU_IRQ_MOD_TCPU_ALLRECP: ISS bug */
-			 IDU_IRQ_MODE_PULSE_TRIG);
-
-	idu_enable();
-
-	/* Attach the arch-common IPI ISR to our IDU IRQ */
-	smp_ipi_irq_setup(cpu, IDU_INTERRUPT_0 + cpu);
-}
-
-static void iss_model_ipi_send(int cpu)
-{
-	idu_irq_assert(cpu);
-}
-
-static void iss_model_ipi_clear(int irq)
-{
-	idu_irq_clear(IDU_INTERRUPT_0 + smp_processor_id());
-}
-
-void iss_model_init_early_smp(void)
-{
-#define IS_AVAIL1(var, str)    ((var) ? str : "")
-
-	struct bcr_mp mp;
-
-	READ_BCR(ARC_REG_MP_BCR, mp);
-
-	sprintf(smp_cpuinfo_buf, "Extn [ISS-SMP]: v%d, arch(%d) %s %s %s\n",
-		mp.ver, mp.mp_arch, IS_AVAIL1(mp.scu, "SCU"),
-		IS_AVAIL1(mp.idu, "IDU"), IS_AVAIL1(mp.sdu, "SDU"));
-
-	plat_smp_ops.info = smp_cpuinfo_buf;
-
-	plat_smp_ops.cpu_kick = iss_model_smp_wakeup_cpu;
-	plat_smp_ops.ipi_send = iss_model_ipi_send;
-	plat_smp_ops.ipi_clear = iss_model_ipi_clear;
-}
-
-/*
- *-------------------------------------------------------------------
- * Low level Platform IPI Providers
- *-------------------------------------------------------------------
- */
-
-/* Set the Mode for the Common IRQ */
-void idu_irq_set_mode(uint8_t irq, uint8_t dest_mode, uint8_t trig_mode)
-{
-	uint32_t par = IDU_IRQ_MODE_PARAM(dest_mode, trig_mode);
-
-	IDU_SET_PARAM(par);
-	IDU_SET_COMMAND(irq, IDU_IRQ_WMODE);
-}
-
-/* Set the target cpu Bitmask for Common IRQ */
-void idu_irq_set_tgtcpu(uint8_t irq, uint32_t mask)
-{
-	IDU_SET_PARAM(mask);
-	IDU_SET_COMMAND(irq, IDU_IRQ_WBITMASK);
-}
-
-/* Get the Interrupt Acknowledged status for IRQ (as CPU Bitmask) */
-bool idu_irq_get_ack(uint8_t irq)
-{
-	uint32_t val;
-
-	IDU_SET_COMMAND(irq, IDU_IRQ_ACK);
-	val = IDU_GET_PARAM();
-
-	return val & (1 << irq);
-}
-
-/*
- * Get the Interrupt Pending status for IRQ (as CPU Bitmask)
- * -Pending means CPU has not yet noticed the IRQ (e.g. disabled)
- * -After Interrupt has been taken, the IPI expcitily needs to be
- *  cleared, to be acknowledged.
- */
-bool idu_irq_get_pend(uint8_t irq)
-{
-	uint32_t val;
-
-	IDU_SET_COMMAND(irq, IDU_IRQ_PEND);
-	val = IDU_GET_PARAM();
-
-	return val & (1 << irq);
-}