Release 4.14 arch/mips/kernel/smp-bmips.c

/*
 * 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) 2011 by Kevin Cernekee (cernekee@gmail.com)
 *
 * SMP support for BMIPS
 */

#include <linux/init.h>
#include <linux/sched.h>
#include <linux/sched/hotplug.h>
#include <linux/sched/task_stack.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/reboot.h>
#include <linux/io.h>
#include <linux/compiler.h>
#include <linux/linkage.h>
#include <linux/bug.h>
#include <linux/kernel.h>

#include <asm/time.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/bootinfo.h>
#include <asm/pmon.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/mipsregs.h>
#include <asm/bmips.h>
#include <asm/traps.h>
#include <asm/barrier.h>
#include <asm/cpu-features.h>


static int __maybe_unused max_cpus = 1;

/* these may be configured by the platform code */

int bmips_smp_enabled = 1;

int bmips_cpu_offset;

cpumask_t bmips_booted_mask;

unsigned long bmips_tp1_irqs = IE_IRQ1;


#define RESET_FROM_KSEG0		0x80080800

#define RESET_FROM_KSEG1		0xa0080800

static void bmips_set_reset_vec(int cpu, u32 val);

#ifdef CONFIG_SMP

/* initial $sp, $gp - used by arch/mips/kernel/bmips_vec.S */

unsigned long bmips_smp_boot_sp;

unsigned long bmips_smp_boot_gp;

static void bmips43xx_send_ipi_single(int cpu, unsigned int action);
static void bmips5000_send_ipi_single(int cpu, unsigned int action);
static irqreturn_t bmips43xx_ipi_interrupt(int irq, void *dev_id);
static irqreturn_t bmips5000_ipi_interrupt(int irq, void *dev_id);

/* SW interrupts 0,1 are used for interprocessor signaling */

#define IPI0_IRQ			(MIPS_CPU_IRQ_BASE + 0)

#define IPI1_IRQ			(MIPS_CPU_IRQ_BASE + 1)


#define CPUNUM(cpu, shift)		(((cpu) + bmips_cpu_offset) << (shift))

#define ACTION_CLR_IPI(cpu, ipi)	(0x2000 | CPUNUM(cpu, 9) | ((ipi) << 8))

#define ACTION_SET_IPI(cpu, ipi)	(0x3000 | CPUNUM(cpu, 9) | ((ipi) << 8))

#define ACTION_BOOT_THREAD(cpu)		(0x08 | CPUNUM(cpu, 0))



static void __init bmips_smp_setup(void)
{
	int i, cpu = 1, boot_cpu = 0;
	int cpu_hw_intr;

	switch (current_cpu_type()) {
	case CPU_BMIPS4350:
	case CPU_BMIPS4380:
		/* arbitration priority */
		clear_c0_brcm_cmt_ctrl(0x30);

		/* NBK and weak order flags */
		set_c0_brcm_config_0(0x30000);

		/* Find out if we are running on TP0 or TP1 */
		boot_cpu = !!(read_c0_brcm_cmt_local() & (1 << 31));

		/*
                 * MIPS interrupts 0,1 (SW INT 0,1) cross over to the other
                 * thread
                 * MIPS interrupt 2 (HW INT 0) is the CPU0 L1 controller output
                 * MIPS interrupt 3 (HW INT 1) is the CPU1 L1 controller output
                 */
		if (boot_cpu == 0)
			cpu_hw_intr = 0x02;
		else
			cpu_hw_intr = 0x1d;

		change_c0_brcm_cmt_intr(0xf8018000,
					(cpu_hw_intr << 27) | (0x03 << 15));

		/* single core, 2 threads (2 pipelines) */
		max_cpus = 2;

		break;
	case CPU_BMIPS5000:
		/* enable raceless SW interrupts */
		set_c0_brcm_config(0x03 << 22);

		/* route HW interrupt 0 to CPU0, HW interrupt 1 to CPU1 */
		change_c0_brcm_mode(0x1f << 27, 0x02 << 27);

		/* N cores, 2 threads per core */
		max_cpus = (((read_c0_brcm_config() >> 6) & 0x03) + 1) << 1;

		/* clear any pending SW interrupts */
		for (i = 0; i < max_cpus; i++) {
			write_c0_brcm_action(ACTION_CLR_IPI(i, 0));
			write_c0_brcm_action(ACTION_CLR_IPI(i, 1));
		}

		break;
	default:
		max_cpus = 1;
	}

	if (!bmips_smp_enabled)
		max_cpus = 1;

	/* this can be overridden by the BSP */
	if (!board_ebase_setup)
		board_ebase_setup = &bmips_ebase_setup;

	__cpu_number_map[boot_cpu] = 0;
	__cpu_logical_map[0] = boot_cpu;

	for (i = 0; i < max_cpus; i++) {
		if (i != boot_cpu) {
			__cpu_number_map[i] = cpu;
			__cpu_logical_map[cpu] = i;
			cpu++;
		}
		set_cpu_possible(i, 1);
		set_cpu_present(i, 1);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
181
65.58%
1
25.00%
Florian Fainelli
71
25.72%
2
50.00%
Jonas Gorski
24
8.70%
1
25.00%
Total
276
100.00%
4
100.00%

/*
 * IPI IRQ setup - runs on CPU0
 */


static void bmips_prepare_cpus(unsigned int max_cpus)
{
	irqreturn_t (*bmips_ipi_interrupt)(int irq, void *dev_id);

	switch (current_cpu_type()) {
	case CPU_BMIPS4350:
	case CPU_BMIPS4380:
		bmips_ipi_interrupt = bmips43xx_ipi_interrupt;
		break;
	case CPU_BMIPS5000:
		bmips_ipi_interrupt = bmips5000_ipi_interrupt;
		break;
	default:
		return;
	}

	if (request_irq(IPI0_IRQ, bmips_ipi_interrupt, IRQF_PERCPU,
			"smp_ipi0", NULL))
		panic("Can't request IPI0 interrupt");
	if (request_irq(IPI1_IRQ, bmips_ipi_interrupt, IRQF_PERCPU,
			"smp_ipi1", NULL))
		panic("Can't request IPI1 interrupt");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
48
52.17%
1
33.33%
Jonas Gorski
42
45.65%
1
33.33%
Ralf Bächle
2
2.17%
1
33.33%
Total
92
100.00%
3
100.00%

/*
 * Tell the hardware to boot CPUx - runs on CPU0
 */


static int bmips_boot_secondary(int cpu, struct task_struct *idle)
{
	bmips_smp_boot_sp = __KSTK_TOS(idle);
	bmips_smp_boot_gp = (unsigned long)task_thread_info(idle);
	mb();

	/*
         * Initial boot sequence for secondary CPU:
         *   bmips_reset_nmi_vec @ a000_0000 ->
         *   bmips_smp_entry ->
         *   plat_wired_tlb_setup (cached function call; optional) ->
         *   start_secondary (cached jump)
         *
         * Warm restart sequence:
         *   play_dead WAIT loop ->
         *   bmips_smp_int_vec @ BMIPS_WARM_RESTART_VEC ->
         *   eret to play_dead ->
         *   bmips_secondary_reentry ->
         *   start_secondary
         */

	pr_info("SMP: Booting CPU%d...\n", cpu);

	if (cpumask_test_cpu(cpu, &bmips_booted_mask)) {
		/* kseg1 might not exist if this CPU enabled XKS01 */
		bmips_set_reset_vec(cpu, RESET_FROM_KSEG0);

		switch (current_cpu_type()) {
		case CPU_BMIPS4350:
		case CPU_BMIPS4380:
			bmips43xx_send_ipi_single(cpu, 0);
			break;
		case CPU_BMIPS5000:
			bmips5000_send_ipi_single(cpu, 0);
			break;
		}
	} else {
		bmips_set_reset_vec(cpu, RESET_FROM_KSEG1);

		switch (current_cpu_type()) {
		case CPU_BMIPS4350:
		case CPU_BMIPS4380:
			/* Reset slave TP1 if booting from TP0 */
			if (cpu_logical_map(cpu) == 1)
				set_c0_brcm_cmt_ctrl(0x01);
			break;
		case CPU_BMIPS5000:
			write_c0_brcm_action(ACTION_BOOT_THREAD(cpu));
			break;
		}
		cpumask_set_cpu(cpu, &bmips_booted_mask);
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
97
61.78%
2
33.33%
Jonas Gorski
46
29.30%
1
16.67%
Florian Fainelli
10
6.37%
2
33.33%
Paul Burton
4
2.55%
1
16.67%
Total
157
100.00%
6
100.00%

/*
 * Early setup - runs on secondary CPU after cache probe
 */


static void bmips_init_secondary(void)
{
	switch (current_cpu_type()) {
	case CPU_BMIPS4350:
	case CPU_BMIPS4380:
		clear_c0_cause(smp_processor_id() ? C_SW1 : C_SW0);
		break;
	case CPU_BMIPS5000:
		write_c0_brcm_action(ACTION_CLR_IPI(smp_processor_id(), 0));
		cpu_set_core(&current_cpu_data, (read_c0_brcm_config() >> 25) & 3);
		break;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
28
45.16%
1
20.00%
Jonas Gorski
18
29.03%
1
20.00%
Florian Fainelli
10
16.13%
1
20.00%
Paul Burton
5
8.06%
1
20.00%
Yong Zhang
1
1.61%
1
20.00%
Total
62
100.00%
5
100.00%

/*
 * Late setup - runs on secondary CPU before entering the idle loop
 */


static void bmips_smp_finish(void)
{
	pr_info("SMP: CPU%d is running\n", smp_processor_id());

	/* make sure there won't be a timer interrupt for a little while */
	write_c0_compare(read_c0_count() + mips_hpt_frequency / HZ);

	irq_enable_hazard();
	set_c0_status(IE_SW0 | IE_SW1 | bmips_tp1_irqs | IE_IRQ5 | ST0_IE);
	irq_enable_hazard();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
31
67.39%
2
66.67%
Yong Zhang
15
32.61%
1
33.33%
Total
46
100.00%
3
100.00%

/*
 * BMIPS5000 raceless IPIs
 *
 * Each CPU has two inbound SW IRQs which are independent of all other CPUs.
 * IPI0 is used for SMP_RESCHEDULE_YOURSELF
 * IPI1 is used for SMP_CALL_FUNCTION
 */



static void bmips5000_send_ipi_single(int cpu, unsigned int action)
{
	write_c0_brcm_action(ACTION_SET_IPI(cpu, action == SMP_CALL_FUNCTION));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
24
96.00%
1
50.00%
Jonas Gorski
1
4.00%
1
50.00%
Total
25
100.00%
2
100.00%



static irqreturn_t bmips5000_ipi_interrupt(int irq, void *dev_id)
{
	int action = irq - IPI0_IRQ;

	write_c0_brcm_action(ACTION_CLR_IPI(smp_processor_id(), action));

	if (action == 0)
		scheduler_ipi();
	else
		generic_smp_call_function_interrupt();

	return IRQ_HANDLED;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
45
95.74%
1
33.33%
Alex Smith
1
2.13%
1
33.33%
Jonas Gorski
1
2.13%
1
33.33%
Total
47
100.00%
3
100.00%



static void bmips5000_send_ipi_mask(const struct cpumask *mask,
	unsigned int action)
{
	unsigned int i;

	for_each_cpu(i, mask)
		bmips5000_send_ipi_single(i, action);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jonas Gorski
33
100.00%
1
100.00%
Total
33
100.00%
1
100.00%

/*
 * BMIPS43xx racey IPIs
 *
 * We use one inbound SW IRQ for each CPU.
 *
 * A spinlock must be held in order to keep CPUx from accidentally clearing
 * an incoming IPI when it writes CP0 CAUSE to raise an IPI on CPUy.  The
 * same spinlock is used to protect the action masks.
 */

static DEFINE_SPINLOCK(ipi_lock);
static DEFINE_PER_CPU(int, ipi_action_mask);



static void bmips43xx_send_ipi_single(int cpu, unsigned int action)
{
	unsigned long flags;

	spin_lock_irqsave(&ipi_lock, flags);
	set_c0_cause(cpu ? C_SW1 : C_SW0);
	per_cpu(ipi_action_mask, cpu) |= action;
	irq_enable_hazard();
	spin_unlock_irqrestore(&ipi_lock, flags);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
53
98.15%
1
50.00%
Jonas Gorski
1
1.85%
1
50.00%
Total
54
100.00%
2
100.00%



static irqreturn_t bmips43xx_ipi_interrupt(int irq, void *dev_id)
{
	unsigned long flags;
	int action, cpu = irq - IPI0_IRQ;

	spin_lock_irqsave(&ipi_lock, flags);
	action = __this_cpu_read(ipi_action_mask);
	per_cpu(ipi_action_mask, cpu) = 0;
	clear_c0_cause(cpu ? C_SW1 : C_SW0);
	spin_unlock_irqrestore(&ipi_lock, flags);

	if (action & SMP_RESCHEDULE_YOURSELF)
		scheduler_ipi();
	if (action & SMP_CALL_FUNCTION)
		generic_smp_call_function_interrupt();

	return IRQ_HANDLED;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
85
96.59%
1
25.00%
Christoph Lameter
1
1.14%
1
25.00%
Jonas Gorski
1
1.14%
1
25.00%
Alex Smith
1
1.14%
1
25.00%
Total
88
100.00%
4
100.00%



static void bmips43xx_send_ipi_mask(const struct cpumask *mask,
	unsigned int action)
{
	unsigned int i;

	for_each_cpu(i, mask)
		bmips43xx_send_ipi_single(i, action);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
31
93.94%
1
50.00%
Jonas Gorski
2
6.06%
1
50.00%
Total
33
100.00%
2
100.00%

#ifdef CONFIG_HOTPLUG_CPU



static int bmips_cpu_disable(void)
{
	unsigned int cpu = smp_processor_id();

	if (cpu == 0)
		return -EBUSY;

	pr_info("SMP: CPU%d is offline\n", cpu);

	set_cpu_online(cpu, false);
	calculate_cpu_foreign_map();
	irq_cpu_offline();
	clear_c0_status(IE_IRQ5);

	local_flush_tlb_all();
	local_flush_icache_range(0, ~0);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
51
79.69%
1
20.00%
Jon Fraser
5
7.81%
1
20.00%
Florian Fainelli
3
4.69%
1
20.00%
James Hogan
3
4.69%
1
20.00%
Rusty Russell
2
3.12%
1
20.00%
Total
64
100.00%
5
100.00%



static void bmips_cpu_die(unsigned int cpu)
{
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
9
100.00%
1
100.00%
Total
9
100.00%
1
100.00%



void __ref play_dead(void)
{
	idle_task_exit();

	/* flush data cache */
	_dma_cache_wback_inv(0, ~0);

	/*
         * Wakeup is on SW0 or SW1; disable everything else
         * Use BEV !IV (BMIPS_WARM_RESTART_VEC) to avoid the regular Linux
         * IRQ handlers; this clears ST0_IE and returns immediately.
         */
	clear_c0_cause(CAUSEF_IV | C_SW0 | C_SW1);
	change_c0_status(
		IE_IRQ5 | bmips_tp1_irqs | IE_SW0 | IE_SW1 | ST0_IE | ST0_BEV,
		IE_SW0 | IE_SW1 | ST0_IE | ST0_BEV);
	irq_disable_hazard();

	/*
         * wait for SW interrupt from bmips_boot_secondary(), then jump
         * back to start_secondary()
         */
	__asm__ __volatile__(
        "       wait\n"
        "       j       bmips_secondary_reentry\n"
        : : : "memory");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
60
100.00%
2
100.00%
Total
60
100.00%
2
100.00%

#endif /* CONFIG_HOTPLUG_CPU */


const struct plat_smp_ops bmips43xx_smp_ops = {
	.smp_setup		= bmips_smp_setup,
	.prepare_cpus		= bmips_prepare_cpus,
	.boot_secondary		= bmips_boot_secondary,
	.smp_finish		= bmips_smp_finish,
	.init_secondary		= bmips_init_secondary,
	.send_ipi_single	= bmips43xx_send_ipi_single,
	.send_ipi_mask		= bmips43xx_send_ipi_mask,
#ifdef CONFIG_HOTPLUG_CPU
	.cpu_disable		= bmips_cpu_disable,
	.cpu_die		= bmips_cpu_die,
#endif
};


const struct plat_smp_ops bmips5000_smp_ops = {
	.smp_setup		= bmips_smp_setup,
	.prepare_cpus		= bmips_prepare_cpus,
	.boot_secondary		= bmips_boot_secondary,
	.smp_finish		= bmips_smp_finish,
	.init_secondary		= bmips_init_secondary,
	.send_ipi_single	= bmips5000_send_ipi_single,
	.send_ipi_mask		= bmips5000_send_ipi_mask,
#ifdef CONFIG_HOTPLUG_CPU
	.cpu_disable		= bmips_cpu_disable,
	.cpu_die		= bmips_cpu_die,
#endif
};

#endif /* CONFIG_SMP */

/***********************************************************************
 * BMIPS vector relocation
 * This is primarily used for SMP boot, but it is applicable to some
 * UP BMIPS systems as well.
 ***********************************************************************/



static void bmips_wr_vec(unsigned long dst, char *start, char *end)
{
	memcpy((void *)dst, start, end - start);
	dma_cache_wback(dst, end - start);
	local_flush_icache_range(dst, dst + (end - start));
	instruction_hazard();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
57
98.28%
1
50.00%
Petri Gynther
1
1.72%
1
50.00%
Total
58
100.00%
2
100.00%



static inline void bmips_nmi_handler_setup(void)
{
	bmips_wr_vec(BMIPS_NMI_RESET_VEC, &bmips_reset_nmi_vec,
		&bmips_reset_nmi_vec_end);
	bmips_wr_vec(BMIPS_WARM_RESTART_VEC, &bmips_smp_int_vec,
		&bmips_smp_int_vec_end);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
31
100.00%
1
100.00%
Total
31
100.00%
1
100.00%


struct reset_vec_info {
	
int cpu;
	
u32 val;
};



static void bmips_set_reset_vec_remote(void *vinfo)
{
	struct reset_vec_info *info = vinfo;
	int shift = info->cpu & 0x01 ? 16 : 0;
	u32 mask = ~(0xffff << shift), val = info->val >> 16;

	preempt_disable();
	if (smp_processor_id() > 0) {
		smp_call_function_single(0, &bmips_set_reset_vec_remote,
					 info, 1);
	} else {
		if (info->cpu & 0x02) {
			/* BMIPS5200 "should" use mask/shift, but it's buggy */
			bmips_write_zscm_reg(0xa0, (val << 16) | val);
			bmips_read_zscm_reg(0xa0);
		} else {
			write_c0_brcm_bootvec((read_c0_brcm_bootvec() & mask) |
					      (val << shift));
		}
	}
	preempt_enable();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
126
100.00%
1
100.00%
Total
126
100.00%
1
100.00%



static void bmips_set_reset_vec(int cpu, u32 val)
{
	struct reset_vec_info info;

	if (current_cpu_type() == CPU_BMIPS5000) {
		/* this needs to run from CPU0 (which is always online) */
		info.cpu = cpu;
		info.val = val;
		bmips_set_reset_vec_remote(&info);
	} else {
		void __iomem *cbr = BMIPS_GET_CBR();

		if (cpu == 0)
			__raw_writel(val, cbr + BMIPS_RELO_VECTOR_CONTROL_0);
		else {
			if (current_cpu_type() != CPU_BMIPS4380)
				return;
			__raw_writel(val, cbr + BMIPS_RELO_VECTOR_CONTROL_1);
		}
	}
	__sync();
	back_to_back_c0_hazard();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
96
100.00%
1
100.00%
Total
96
100.00%
1
100.00%



void bmips_ebase_setup(void)
{
	unsigned long new_ebase = ebase;

	BUG_ON(ebase != CKSEG0);

	switch (current_cpu_type()) {
	case CPU_BMIPS4350:
		/*
                 * BMIPS4350 cannot relocate the normal vectors, but it
                 * can relocate the BEV=1 vectors.  So CPU1 starts up at
                 * the relocated BEV=1, IV=0 general exception vector @
                 * 0xa000_0380.
                 *
                 * set_uncached_handler() is used here because:
                 *  - CPU1 will run this from uncached space
                 *  - None of the cacheflush functions are set up yet
                 */
		set_uncached_handler(BMIPS_WARM_RESTART_VEC - CKSEG0,
			&bmips_smp_int_vec, 0x80);
		__sync();
		return;
	case CPU_BMIPS3300:
	case CPU_BMIPS4380:
		/*
                 * 0x8000_0000: reset/NMI (initially in kseg1)
                 * 0x8000_0400: normal vectors
                 */
		new_ebase = 0x80000400;
		bmips_set_reset_vec(0, RESET_FROM_KSEG0);
		break;
	case CPU_BMIPS5000:
		/*
                 * 0x8000_0000: reset/NMI (initially in kseg1)
                 * 0x8000_1000: normal vectors
                 */
		new_ebase = 0x80001000;
		bmips_set_reset_vec(0, RESET_FROM_KSEG0);
		write_c0_ebase(new_ebase);
		break;
	default:
		return;
	}

	board_nmi_handler_setup = &bmips_nmi_handler_setup;
	ebase = new_ebase;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
73
74.49%
2
50.00%
Jonas Gorski
22
22.45%
1
25.00%
Jon Fraser
3
3.06%
1
25.00%
Total
98
100.00%
4
100.00%



asmlinkage void __weak plat_wired_tlb_setup(void)
{
	/*
         * Called when starting/restarting a secondary CPU.
         * Kernel stacks and other important data might only be accessible
         * once the wired entries are present.
         */
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
10
100.00%
1
100.00%
Total
10
100.00%
1
100.00%



void __init bmips_cpu_setup(void)
{
	void __iomem __maybe_unused *cbr = BMIPS_GET_CBR();
	u32 __maybe_unused cfg;

	switch (current_cpu_type()) {
	case CPU_BMIPS3300:
		/* Set BIU to async mode */
		set_c0_brcm_bus_pll(BIT(22));
		__sync();

		/* put the BIU back in sync mode */
		clear_c0_brcm_bus_pll(BIT(22));

		/* clear BHTD to enable branch history table */
		clear_c0_brcm_reset(BIT(16));

		/* Flush and enable RAC */
		cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
		__raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG);
		__raw_readl(cbr + BMIPS_RAC_CONFIG);

		cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
		__raw_writel(cfg | 0xf, cbr + BMIPS_RAC_CONFIG);
		__raw_readl(cbr + BMIPS_RAC_CONFIG);

		cfg = __raw_readl(cbr + BMIPS_RAC_ADDRESS_RANGE);
		__raw_writel(cfg | 0x0fff0000, cbr + BMIPS_RAC_ADDRESS_RANGE);
		__raw_readl(cbr + BMIPS_RAC_ADDRESS_RANGE);
		break;

	case CPU_BMIPS4380:
		/* CBG workaround for early BMIPS4380 CPUs */
		switch (read_c0_prid()) {
		case 0x2a040:
		case 0x2a042:
		case 0x2a044:
		case 0x2a060:
			cfg = __raw_readl(cbr + BMIPS_L2_CONFIG);
			__raw_writel(cfg & ~0x07000000, cbr + BMIPS_L2_CONFIG);
			__raw_readl(cbr + BMIPS_L2_CONFIG);
		}

		/* clear BHTD to enable branch history table */
		clear_c0_brcm_config_0(BIT(21));

		/* XI/ROTR enable */
		set_c0_brcm_config_0(BIT(23));
		set_c0_brcm_cmt_ctrl(BIT(15));
		break;

	case CPU_BMIPS5000:
		/* enable RDHWR, BRDHWR */
		set_c0_brcm_config(BIT(17) | BIT(21));

		/* Disable JTB */
		__asm__ __volatile__(
                "       .set    noreorder\n"
                "       li      $8, 0x5a455048\n"
                "       .word   0x4088b00f\n"	/* mtc0 t0, $22, 15 */
		"       .word   0x4008b008\n"	/* mfc0 t0, $22, 8 */
		"       li      $9, 0x00008000\n"
                "       or      $8, $8, $9\n"
                "       .word   0x4088b008\n"	/* mtc0 t0, $22, 8 */
		"       sync\n"
                "       li      $8, 0x0\n"
                "       .word   0x4088b00f\n"	/* mtc0 t0, $22, 15 */
		"       .set    reorder\n"
                : : : "$8", "$9");

		/* XI enable */
		set_c0_brcm_config(BIT(27));

		/* enable MIPS32R2 ROR instruction for XI TLB handlers */
		__asm__ __volatile__(
                "       li      $8, 0x5a455048\n"
                "       .word   0x4088b00f\n"	/* mtc0 $8, $22, 15 */
		"       nop; nop; nop\n"
                "       .word   0x4008b008\n"	/* mfc0 $8, $22, 8 */
		"       lui     $9, 0x0100\n"
                "       or      $8, $9\n"
                "       .word   0x4088b008\n"	/* mtc0 $8, $22, 8 */
		: : : "$8", "$9");
		break;
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Florian Fainelli
267
98.52%
1
50.00%
Jaedon Shin
4
1.48%
1
50.00%
Total
271
100.00%
2
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Kevin Cernekee
1433
67.34%
4
15.38%
Florian Fainelli
361
16.96%
6
23.08%
Jonas Gorski
277
13.02%
1
3.85%
Yong Zhang
17
0.80%
1
3.85%
Paul Burton
9
0.42%
2
7.69%
Jon Fraser
8
0.38%
2
7.69%
Jaedon Shin
4
0.19%
1
3.85%
James Hogan
3
0.14%
1
3.85%
Arnd Bergmann
3
0.14%
1
3.85%
Ingo Molnar
3
0.14%
1
3.85%
Ralf Bächle
2
0.09%
1
3.85%
Rusty Russell
2
0.09%
1
3.85%
Matt Redfearn
2
0.09%
1
3.85%
Alex Smith
2
0.09%
1
3.85%
Christoph Lameter
1
0.05%
1
3.85%
Petri Gynther
1
0.05%
1
3.85%
Total
2128
100.00%
26
100.00%
Directory: arch/mips/kernel

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.