Orange Pi5 kernel

 // SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 2011 IBM Corporation.
 */
 
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/cpu.h>
#include <linux/of.h>
#include <linux/spinlock.h>
#include <linux/module.h>
 
#include <asm/prom.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/irq.h>
#include <asm/errno.h>
#include <asm/xics.h>
#include <asm/kvm_ppc.h>
#include <asm/dbell.h>
 
struct icp_ipl {
<------>union {
<------><------>u32 word;
<------><------>u8 bytes[4];
<------>} xirr_poll;
<------>union {
<------><------>u32 word;
<------><------>u8 bytes[4];
<------>} xirr;
<------>u32 dummy;
<------>union {
<------><------>u32 word;
<------><------>u8 bytes[4];
<------>} qirr;
<------>u32 link_a;
<------>u32 link_b;
<------>u32 link_c;
};
 
static struct icp_ipl __iomem *icp_native_regs[NR_CPUS];
 
static inline unsigned int icp_native_get_xirr(void)
{
<------>int cpu = smp_processor_id();
<------>unsigned int xirr;
 
<------>/* Handled an interrupt latched by KVM */
<------>xirr = kvmppc_get_xics_latch();
<------>if (xirr)
<------><------>return xirr;
 
<------>return in_be32(&icp_native_regs[cpu]->xirr.word);
}
 
static inline void icp_native_set_xirr(unsigned int value)
{
<------>int cpu = smp_processor_id();
 
<------>out_be32(&icp_native_regs[cpu]->xirr.word, value);
}
 
static inline void icp_native_set_cppr(u8 value)
{
<------>int cpu = smp_processor_id();
 
<------>out_8(&icp_native_regs[cpu]->xirr.bytes[0], value);
}
 
static inline void icp_native_set_qirr(int n_cpu, u8 value)
{
<------>out_8(&icp_native_regs[n_cpu]->qirr.bytes[0], value);
}
 
static void icp_native_set_cpu_priority(unsigned char cppr)
{
<------>xics_set_base_cppr(cppr);
<------>icp_native_set_cppr(cppr);
<------>iosync();
}
 
void icp_native_eoi(struct irq_data *d)
{
<------>unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
 
<------>iosync();
<------>icp_native_set_xirr((xics_pop_cppr() << 24) | hw_irq);
}
 
static void icp_native_teardown_cpu(void)
{
<------>int cpu = smp_processor_id();
 
<------>/* Clear any pending IPI */
<------>icp_native_set_qirr(cpu, 0xff);
}
 
static void icp_native_flush_ipi(void)
{
<------>/* We take the ipi irq but and never return so we
<------> * need to EOI the IPI, but want to leave our priority 0
<------> *
<------> * should we check all the other interrupts too?
<------> * should we be flagging idle loop instead?
<------> * or creating some task to be scheduled?
<------> */
 
<------>icp_native_set_xirr((0x00 << 24) | XICS_IPI);
}
 
static unsigned int icp_native_get_irq(void)
{
<------>unsigned int xirr = icp_native_get_xirr();
<------>unsigned int vec = xirr & 0x00ffffff;
<------>unsigned int irq;
 
<------>if (vec == XICS_IRQ_SPURIOUS)
<------><------>return 0;
 
<------>irq = irq_find_mapping(xics_host, vec);
<------>if (likely(irq)) {
<------><------>xics_push_cppr(vec);
<------><------>return irq;
<------>}
 
<------>/* We don't have a linux mapping, so have rtas mask it. */
<------>xics_mask_unknown_vec(vec);
 
<------>/* We might learn about it later, so EOI it */
<------>icp_native_set_xirr(xirr);
 
<------>return 0;
}
 
#ifdef CONFIG_SMP
 
static void icp_native_cause_ipi(int cpu)
{
<------>kvmppc_set_host_ipi(cpu);
<------>icp_native_set_qirr(cpu, IPI_PRIORITY);
}
 
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
void icp_native_cause_ipi_rm(int cpu)
{
<------>/*
<------> * Currently not used to send IPIs to another CPU
<------> * on the same core. Only caller is KVM real mode.
<------> * Need the physical address of the XICS to be
<------> * previously saved in kvm_hstate in the paca.
<------> */
<------>void __iomem *xics_phys;
 
<------>/*
<------> * Just like the cause_ipi functions, it is required to
<------> * include a full barrier before causing the IPI.
<------> */
<------>xics_phys = paca_ptrs[cpu]->kvm_hstate.xics_phys;
<------>mb();
<------>__raw_rm_writeb(IPI_PRIORITY, xics_phys + XICS_MFRR);
}
#endif
 
/*
 * Called when an interrupt is received on an off-line CPU to
 * clear the interrupt, so that the CPU can go back to nap mode.
 */
void icp_native_flush_interrupt(void)
{
<------>unsigned int xirr = icp_native_get_xirr();
<------>unsigned int vec = xirr & 0x00ffffff;
 
<------>if (vec == XICS_IRQ_SPURIOUS)
<------><------>return;
<------>if (vec == XICS_IPI) {
<------><------>/* Clear pending IPI */
<------><------>int cpu = smp_processor_id();
<------><------>kvmppc_clear_host_ipi(cpu);
<------><------>icp_native_set_qirr(cpu, 0xff);
<------>} else {
<------><------>pr_err("XICS: hw interrupt 0x%x to offline cpu, disabling\n",
<------><------>       vec);
<------><------>xics_mask_unknown_vec(vec);
<------>}
<------>/* EOI the interrupt */
<------>icp_native_set_xirr(xirr);
}
 
void xics_wake_cpu(int cpu)
{
<------>icp_native_set_qirr(cpu, IPI_PRIORITY);
}
EXPORT_SYMBOL_GPL(xics_wake_cpu);
 
static irqreturn_t icp_native_ipi_action(int irq, void *dev_id)
{
<------>int cpu = smp_processor_id();
 
<------>kvmppc_clear_host_ipi(cpu);
<------>icp_native_set_qirr(cpu, 0xff);
 
<------>return smp_ipi_demux();
}
 
#endif /* CONFIG_SMP */
 
static int __init icp_native_map_one_cpu(int hw_id, unsigned long addr,
<------><------><------><------><------> unsigned long size)
{
<------>char *rname;
<------>int i, cpu = -1;
 
<------>/* This may look gross but it's good enough for now, we don't quite
<------> * have a hard -> linux processor id matching.
<------> */
<------>for_each_possible_cpu(i) {
<------><------>if (!cpu_present(i))
<------><------><------>continue;
<------><------>if (hw_id == get_hard_smp_processor_id(i)) {
<------><------><------>cpu = i;
<------><------><------>break;
<------><------>}
<------>}
 
<------>/* Fail, skip that CPU. Don't print, it's normal, some XICS come up
<------> * with way more entries in there than you have CPUs
<------> */
<------>if (cpu == -1)
<------><------>return 0;
 
<------>rname = kasprintf(GFP_KERNEL, "CPU %d [0x%x] Interrupt Presentation",
<------><------><------>  cpu, hw_id);
 
<------>if (!request_mem_region(addr, size, rname)) {
<------><------>pr_warn("icp_native: Could not reserve ICP MMIO for CPU %d, interrupt server #0x%x\n",
<------><------><------>cpu, hw_id);
<------><------>return -EBUSY;
<------>}
 
<------>icp_native_regs[cpu] = ioremap(addr, size);
<------>kvmppc_set_xics_phys(cpu, addr);
<------>if (!icp_native_regs[cpu]) {
<------><------>pr_warn("icp_native: Failed ioremap for CPU %d, interrupt server #0x%x, addr %#lx\n",
<------><------><------>cpu, hw_id, addr);
<------><------>release_mem_region(addr, size);
<------><------>return -ENOMEM;
<------>}
<------>return 0;
}
 
static int __init icp_native_init_one_node(struct device_node *np,
<------><------><------><------><------>   unsigned int *indx)
{
<------>unsigned int ilen;
<------>const __be32 *ireg;
<------>int i;
<------>int reg_tuple_size;
<------>int num_servers = 0;
 
<------>/* This code does the theorically broken assumption that the interrupt
<------> * server numbers are the same as the hard CPU numbers.
<------> * This happens to be the case so far but we are playing with fire...
<------> * should be fixed one of these days. -BenH.
<------> */
<------>ireg = of_get_property(np, "ibm,interrupt-server-ranges", &ilen);
 
<------>/* Do that ever happen ? we'll know soon enough... but even good'old
<------> * f80 does have that property ..
<------> */
<------>WARN_ON((ireg == NULL) || (ilen != 2*sizeof(u32)));
 
<------>if (ireg) {
<------><------>*indx = of_read_number(ireg, 1);
<------><------>if (ilen >= 2*sizeof(u32))
<------><------><------>num_servers = of_read_number(ireg + 1, 1);
<------>}
 
<------>ireg = of_get_property(np, "reg", &ilen);
<------>if (!ireg) {
<------><------>pr_err("icp_native: Can't find interrupt reg property");
<------><------>return -1;
<------>}
 
<------>reg_tuple_size = (of_n_addr_cells(np) + of_n_size_cells(np)) * 4;
<------>if (((ilen % reg_tuple_size) != 0)
<------>    || (num_servers && (num_servers != (ilen / reg_tuple_size)))) {
<------><------>pr_err("icp_native: ICP reg len (%d) != num servers (%d)",
<------><------>       ilen / reg_tuple_size, num_servers);
<------><------>return -1;
<------>}
 
<------>for (i = 0; i < (ilen / reg_tuple_size); i++) {
<------><------>struct resource r;
<------><------>int err;
 
<------><------>err = of_address_to_resource(np, i, &r);
<------><------>if (err) {
<------><------><------>pr_err("icp_native: Could not translate ICP MMIO"
<------><------><------>       " for interrupt server 0x%x (%d)\n", *indx, err);
<------><------><------>return -1;
<------><------>}
 
<------><------>if (icp_native_map_one_cpu(*indx, r.start, resource_size(&r)))
<------><------><------>return -1;
 
<------><------>(*indx)++;
<------>}
<------>return 0;
}
 
static const struct icp_ops icp_native_ops = {
<------>.get_irq	= icp_native_get_irq,
<------>.eoi		= icp_native_eoi,
<------>.set_priority	= icp_native_set_cpu_priority,
<------>.teardown_cpu	= icp_native_teardown_cpu,
<------>.flush_ipi	= icp_native_flush_ipi,
#ifdef CONFIG_SMP
<------>.ipi_action	= icp_native_ipi_action,
<------>.cause_ipi	= icp_native_cause_ipi,
#endif
};
 
int __init icp_native_init(void)
{
<------>struct device_node *np;
<------>u32 indx = 0;
<------>int found = 0;
 
<------>for_each_compatible_node(np, NULL, "ibm,ppc-xicp")
<------><------>if (icp_native_init_one_node(np, &indx) == 0)
<------><------><------>found = 1;
<------>if (!found) {
<------><------>for_each_node_by_type(np,
<------><------><------>"PowerPC-External-Interrupt-Presentation") {
<------><------><------><------>if (icp_native_init_one_node(np, &indx) == 0)
<------><------><------><------><------>found = 1;
<------><------>}
<------>}
 
<------>if (found == 0)
<------><------>return -ENODEV;
 
<------>icp_ops = &icp_native_ops;
 
<------>return 0;
}

	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Copyright 2011 IBM Corporation.
	*/

	#include <linux/types.h>
	#include <linux/kernel.h>
	#include <linux/irq.h>
	#include <linux/smp.h>
	#include <linux/interrupt.h>
	#include <linux/init.h>
	#include <linux/cpu.h>
	#include <linux/of.h>
	#include <linux/spinlock.h>
	#include <linux/module.h>

	#include <asm/prom.h>
	#include <asm/io.h>
	#include <asm/smp.h>
	#include <asm/irq.h>
	#include <asm/errno.h>
	#include <asm/xics.h>
	#include <asm/kvm_ppc.h>
	#include <asm/dbell.h>

	struct icp_ipl {
	<------>union {
	<------><------>u32 word;
	<------><------>u8 bytes[4];
	<------>} xirr_poll;
	<------>union {
	<------><------>u32 word;
	<------><------>u8 bytes[4];
	<------>} xirr;
	<------>u32 dummy;
	<------>union {
	<------><------>u32 word;
	<------><------>u8 bytes[4];
	<------>} qirr;
	<------>u32 link_a;
	<------>u32 link_b;
	<------>u32 link_c;
	};

	static struct icp_ipl __iomem *icp_native_regs[NR_CPUS];

	static inline unsigned int icp_native_get_xirr(void)
	{
	<------>int cpu = smp_processor_id();
	<------>unsigned int xirr;

	<------>/* Handled an interrupt latched by KVM */
	<------>xirr = kvmppc_get_xics_latch();
	<------>if (xirr)
	<------><------>return xirr;

	<------>return in_be32(&icp_native_regs[cpu]->xirr.word);
	}

	static inline void icp_native_set_xirr(unsigned int value)
	{
	<------>int cpu = smp_processor_id();

	<------>out_be32(&icp_native_regs[cpu]->xirr.word, value);
	}

	static inline void icp_native_set_cppr(u8 value)
	{
	<------>int cpu = smp_processor_id();

	<------>out_8(&icp_native_regs[cpu]->xirr.bytes[0], value);
	}

	static inline void icp_native_set_qirr(int n_cpu, u8 value)
	{
	<------>out_8(&icp_native_regs[n_cpu]->qirr.bytes[0], value);
	}

	static void icp_native_set_cpu_priority(unsigned char cppr)
	{
	<------>xics_set_base_cppr(cppr);
	<------>icp_native_set_cppr(cppr);
	<------>iosync();
	}

	void icp_native_eoi(struct irq_data *d)
	{
	<------>unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);

	<------>iosync();
	<------>icp_native_set_xirr((xics_pop_cppr() << 24) \| hw_irq);
	}

	static void icp_native_teardown_cpu(void)
	{
	<------>int cpu = smp_processor_id();

	<------>/* Clear any pending IPI */
	<------>icp_native_set_qirr(cpu, 0xff);
	}

	static void icp_native_flush_ipi(void)
	{
	<------>/* We take the ipi irq but and never return so we
	<------> * need to EOI the IPI, but want to leave our priority 0
	<------> *
	<------> * should we check all the other interrupts too?
	<------> * should we be flagging idle loop instead?
	<------> * or creating some task to be scheduled?
	<------> */

	<------>icp_native_set_xirr((0x00 << 24) \| XICS_IPI);
	}

	static unsigned int icp_native_get_irq(void)
	{
	<------>unsigned int xirr = icp_native_get_xirr();
	<------>unsigned int vec = xirr & 0x00ffffff;
	<------>unsigned int irq;

	<------>if (vec == XICS_IRQ_SPURIOUS)
	<------><------>return 0;

	<------>irq = irq_find_mapping(xics_host, vec);
	<------>if (likely(irq)) {
	<------><------>xics_push_cppr(vec);
	<------><------>return irq;
	<------>}

	<------>/* We don't have a linux mapping, so have rtas mask it. */
	<------>xics_mask_unknown_vec(vec);

	<------>/* We might learn about it later, so EOI it */
	<------>icp_native_set_xirr(xirr);

	<------>return 0;
	}

	#ifdef CONFIG_SMP

	static void icp_native_cause_ipi(int cpu)
	{
	<------>kvmppc_set_host_ipi(cpu);
	<------>icp_native_set_qirr(cpu, IPI_PRIORITY);
	}

	#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
	void icp_native_cause_ipi_rm(int cpu)
	{
	<------>/*
	<------> * Currently not used to send IPIs to another CPU
	<------> * on the same core. Only caller is KVM real mode.
	<------> * Need the physical address of the XICS to be
	<------> * previously saved in kvm_hstate in the paca.
	<------> */
	<------>void __iomem *xics_phys;

	<------>/*
	<------> * Just like the cause_ipi functions, it is required to
	<------> * include a full barrier before causing the IPI.
	<------> */
	<------>xics_phys = paca_ptrs[cpu]->kvm_hstate.xics_phys;
	<------>mb();
	<------>__raw_rm_writeb(IPI_PRIORITY, xics_phys + XICS_MFRR);
	}
	#endif

	/*
	* Called when an interrupt is received on an off-line CPU to
	* clear the interrupt, so that the CPU can go back to nap mode.
	*/
	void icp_native_flush_interrupt(void)
	{
	<------>unsigned int xirr = icp_native_get_xirr();
	<------>unsigned int vec = xirr & 0x00ffffff;

	<------>if (vec == XICS_IRQ_SPURIOUS)
	<------><------>return;
	<------>if (vec == XICS_IPI) {
	<------><------>/* Clear pending IPI */
	<------><------>int cpu = smp_processor_id();
	<------><------>kvmppc_clear_host_ipi(cpu);
	<------><------>icp_native_set_qirr(cpu, 0xff);
	<------>} else {
	<------><------>pr_err("XICS: hw interrupt 0x%x to offline cpu, disabling\n",
	<------><------> vec);
	<------><------>xics_mask_unknown_vec(vec);
	<------>}
	<------>/* EOI the interrupt */
	<------>icp_native_set_xirr(xirr);
	}

	void xics_wake_cpu(int cpu)
	{
	<------>icp_native_set_qirr(cpu, IPI_PRIORITY);
	}
	EXPORT_SYMBOL_GPL(xics_wake_cpu);

	static irqreturn_t icp_native_ipi_action(int irq, void *dev_id)
	{
	<------>int cpu = smp_processor_id();

	<------>kvmppc_clear_host_ipi(cpu);
	<------>icp_native_set_qirr(cpu, 0xff);

	<------>return smp_ipi_demux();
	}

	#endif /* CONFIG_SMP */

	static int __init icp_native_map_one_cpu(int hw_id, unsigned long addr,
	<------><------><------><------><------> unsigned long size)
	{
	<------>char *rname;
	<------>int i, cpu = -1;

	<------>/* This may look gross but it's good enough for now, we don't quite
	<------> * have a hard -> linux processor id matching.
	<------> */
	<------>for_each_possible_cpu(i) {
	<------><------>if (!cpu_present(i))
	<------><------><------>continue;
	<------><------>if (hw_id == get_hard_smp_processor_id(i)) {
	<------><------><------>cpu = i;
	<------><------><------>break;
	<------><------>}
	<------>}

	<------>/* Fail, skip that CPU. Don't print, it's normal, some XICS come up
	<------> * with way more entries in there than you have CPUs
	<------> */
	<------>if (cpu == -1)
	<------><------>return 0;

	<------>rname = kasprintf(GFP_KERNEL, "CPU %d [0x%x] Interrupt Presentation",
	<------><------><------> cpu, hw_id);

	<------>if (!request_mem_region(addr, size, rname)) {
	<------><------>pr_warn("icp_native: Could not reserve ICP MMIO for CPU %d, interrupt server #0x%x\n",
	<------><------><------>cpu, hw_id);
	<------><------>return -EBUSY;
	<------>}

	<------>icp_native_regs[cpu] = ioremap(addr, size);
	<------>kvmppc_set_xics_phys(cpu, addr);
	<------>if (!icp_native_regs[cpu]) {
	<------><------>pr_warn("icp_native: Failed ioremap for CPU %d, interrupt server #0x%x, addr %#lx\n",
	<------><------><------>cpu, hw_id, addr);
	<------><------>release_mem_region(addr, size);
	<------><------>return -ENOMEM;
	<------>}
	<------>return 0;
	}

	static int __init icp_native_init_one_node(struct device_node *np,
	<------><------><------><------><------> unsigned int *indx)
	{
	<------>unsigned int ilen;
	<------>const __be32 *ireg;
	<------>int i;
	<------>int reg_tuple_size;
	<------>int num_servers = 0;

	<------>/* This code does the theorically broken assumption that the interrupt
	<------> * server numbers are the same as the hard CPU numbers.
	<------> * This happens to be the case so far but we are playing with fire...
	<------> * should be fixed one of these days. -BenH.
	<------> */
	<------>ireg = of_get_property(np, "ibm,interrupt-server-ranges", &ilen);

	<------>/* Do that ever happen ? we'll know soon enough... but even good'old
	<------> * f80 does have that property ..
	<------> */
	<------>WARN_ON((ireg == NULL) \|\| (ilen != 2*sizeof(u32)));

	<------>if (ireg) {
	<------><------>*indx = of_read_number(ireg, 1);
	<------><------>if (ilen >= 2*sizeof(u32))
	<------><------><------>num_servers = of_read_number(ireg + 1, 1);
	<------>}

	<------>ireg = of_get_property(np, "reg", &ilen);
	<------>if (!ireg) {
	<------><------>pr_err("icp_native: Can't find interrupt reg property");
	<------><------>return -1;
	<------>}

	<------>reg_tuple_size = (of_n_addr_cells(np) + of_n_size_cells(np)) * 4;
	<------>if (((ilen % reg_tuple_size) != 0)
	<------> \|\| (num_servers && (num_servers != (ilen / reg_tuple_size)))) {
	<------><------>pr_err("icp_native: ICP reg len (%d) != num servers (%d)",
	<------><------> ilen / reg_tuple_size, num_servers);
	<------><------>return -1;
	<------>}

	<------>for (i = 0; i < (ilen / reg_tuple_size); i++) {
	<------><------>struct resource r;
	<------><------>int err;

	<------><------>err = of_address_to_resource(np, i, &r);
	<------><------>if (err) {
	<------><------><------>pr_err("icp_native: Could not translate ICP MMIO"
	<------><------><------> " for interrupt server 0x%x (%d)\n", *indx, err);
	<------><------><------>return -1;
	<------><------>}

	<------><------>if (icp_native_map_one_cpu(*indx, r.start, resource_size(&r)))
	<------><------><------>return -1;

	<------><------>(*indx)++;
	<------>}
	<------>return 0;
	}

	static const struct icp_ops icp_native_ops = {
	<------>.get_irq = icp_native_get_irq,
	<------>.eoi = icp_native_eoi,
	<------>.set_priority = icp_native_set_cpu_priority,
	<------>.teardown_cpu = icp_native_teardown_cpu,
	<------>.flush_ipi = icp_native_flush_ipi,
	#ifdef CONFIG_SMP
	<------>.ipi_action = icp_native_ipi_action,
	<------>.cause_ipi = icp_native_cause_ipi,
	#endif
	};

	int __init icp_native_init(void)
	{
	<------>struct device_node *np;
	<------>u32 indx = 0;
	<------>int found = 0;

	<------>for_each_compatible_node(np, NULL, "ibm,ppc-xicp")
	<------><------>if (icp_native_init_one_node(np, &indx) == 0)
	<------><------><------>found = 1;
	<------>if (!found) {
	<------><------>for_each_node_by_type(np,
	<------><------><------>"PowerPC-External-Interrupt-Presentation") {
	<------><------><------><------>if (icp_native_init_one_node(np, &indx) == 0)
	<------><------><------><------><------>found = 1;
	<------><------>}
	<------>}

	<------>if (found == 0)
	<------><------>return -ENODEV;

	<------>icp_ops = &icp_native_ops;

	<------>return 0;
	}