static void eznps_init_core(unsigned int cpu)
{
u32 sync_value;
struct nps_host_reg_aux_hw_comply hw_comply;
struct nps_host_reg_aux_lpc lpc;
if (NPS_CPU_TO_THREAD_NUM(cpu) != 0)
return;
hw_comply.value = read_aux_reg(AUX_REG_HW_COMPLY);
hw_comply.me = 1;
hw_comply.le = 1;
#ifdef CONFIG_EZNPS_SHARED_TIMER
hw_comply.te = 1;
#endif
write_aux_reg(AUX_REG_HW_COMPLY, hw_comply.value);
/* Enable MMU clock */
lpc.mep = 1;
write_aux_reg(CTOP_AUX_LPC, lpc.value);
/* Boot CPU only */
if (!cpu) {
/* Write to general purpose register in CRG */
sync_value = ioread32be(REG_GEN_PURP_0);
sync_value |= NPS_CRG_SYNC_BIT;
iowrite32be(sync_value, REG_GEN_PURP_0);
}
}
/*
* Arm the timer to interrupt after @limit cycles
* The distinction for oneshot/periodic is done in arc_event_timer_ack() below
*/
static void arc_timer_event_setup(unsigned int limit)
{
write_aux_reg(ARC_REG_TIMER0_LIMIT, limit);
write_aux_reg(ARC_REG_TIMER0_CNT, 0); /* start from 0 */
write_aux_reg(ARC_REG_TIMER0_CTRL, TIMER_CTRL_IE | TIMER_CTRL_NH);
}
static void tlb_entry_insert(unsigned int pd0, unsigned int pd1)
{
unsigned int idx;
/*
* First verify if entry for this vaddr+ASID already exists
* This also sets up PD0 (vaddr, ASID..) for final commit
*/
idx = tlb_entry_lkup(pd0);
/*
* If Not already present get a free slot from MMU.
* Otherwise, Probe would have located the entry and set INDEX Reg
* with existing location. This will cause Write CMD to over-write
* existing entry with new PD0 and PD1
*/
if (likely(idx & TLB_LKUP_ERR))
write_aux_reg(ARC_REG_TLBCOMMAND, TLBGetIndex);
/* setup the other half of TLB entry (pfn, rwx..) */
write_aux_reg(ARC_REG_TLBPD1, pd1);
/*
* Commit the Entry to MMU
* It doesnt sound safe to use the TLBWriteNI cmd here
* which doesn't flush uTLBs. I'd rather be safe than sorry.
*/
write_aux_reg(ARC_REG_TLBCOMMAND, TLBWrite);
}
void arc_mmu_init(void)
{
char str[256];
struct cpuinfo_arc_mmu *mmu = &cpuinfo_arc700[smp_processor_id()].mmu;
printk(arc_mmu_mumbojumbo(0, str, sizeof(str)));
/* For efficiency sake, kernel is compile time built for a MMU ver
* This must match the hardware it is running on.
* Linux built for MMU V2, if run on MMU V1 will break down because V1
* hardware doesn't understand cmds such as WriteNI, or IVUTLB
* On the other hand, Linux built for V1 if run on MMU V2 will do
* un-needed workarounds to prevent memcpy thrashing.
* Similarly MMU V3 has new features which won't work on older MMU
*/
if (mmu->ver != CONFIG_ARC_MMU_VER) {
panic("MMU ver %d doesn't match kernel built for %d...\n",
mmu->ver, CONFIG_ARC_MMU_VER);
}
if (mmu->pg_sz != PAGE_SIZE)
panic("MMU pg size != PAGE_SIZE (%luk)\n", TO_KB(PAGE_SIZE));
/* Enable the MMU */
write_aux_reg(ARC_REG_PID, MMU_ENABLE);
/* In smp we use this reg for interrupt 1 scratch */
#ifndef CONFIG_SMP
/* swapper_pg_dir is the pgd for the kernel, used by vmalloc */
write_aux_reg(ARC_REG_SCRATCH_DATA0, swapper_pg_dir);
#endif
}
/*
* Early Hardware specific Interrupt setup
* -Called very early (start_kernel -> setup_arch -> setup_processor)
* -Platform Independent (must for any ARC Core)
* -Needed for each CPU (hence not foldable into init_IRQ)
*/
void arc_init_IRQ(void)
{
unsigned int tmp, irq_prio, i;
struct bcr_irq_arcv2 irq_bcr;
struct aux_irq_ctrl {
#ifdef CONFIG_CPU_BIG_ENDIAN
unsigned int res3:18, save_idx_regs:1, res2:1,
save_u_to_u:1, save_lp_regs:1, save_blink:1,
res:4, save_nr_gpr_pairs:5;
#else
unsigned int save_nr_gpr_pairs:5, res:4,
save_blink:1, save_lp_regs:1, save_u_to_u:1,
res2:1, save_idx_regs:1, res3:18;
#endif
} ictrl;
*(unsigned int *)&ictrl = 0;
ictrl.save_nr_gpr_pairs = 6; /* r0 to r11 (r12 saved manually) */
ictrl.save_blink = 1;
ictrl.save_lp_regs = 1; /* LP_COUNT, LP_START, LP_END */
ictrl.save_u_to_u = 0; /* user ctxt saved on kernel stack */
ictrl.save_idx_regs = 1; /* JLI, LDI, EI */
WRITE_AUX(AUX_IRQ_CTRL, ictrl);
/*
* ARCv2 core intc provides multiple interrupt priorities (upto 16).
* Typical builds though have only two levels (0-high, 1-low)
* Linux by default uses lower prio 1 for most irqs, reserving 0 for
* NMI style interrupts in future (say perf)
*/
READ_BCR(ARC_REG_IRQ_BCR, irq_bcr);
irq_prio = irq_bcr.prio; /* Encoded as N-1 for N levels */
pr_info("archs-intc\t: %d priority levels (default %d)%s\n",
irq_prio + 1, ARCV2_IRQ_DEF_PRIO,
irq_bcr.firq ? " FIRQ (not used)":"");
/*
* Set a default priority for all available interrupts to prevent
* switching of register banks if Fast IRQ and multiple register banks
* are supported by CPU.
* Also disable all IRQ lines so faulty external hardware won't
* trigger interrupt that kernel is not ready to handle.
*/
for (i = NR_EXCEPTIONS; i < irq_bcr.irqs + NR_EXCEPTIONS; i++) {
write_aux_reg(AUX_IRQ_SELECT, i);
write_aux_reg(AUX_IRQ_PRIORITY, ARCV2_IRQ_DEF_PRIO);
write_aux_reg(AUX_IRQ_ENABLE, 0);
}
/* setup status32, don't enable intr yet as kernel doesn't want */
tmp = read_aux_reg(ARC_REG_STATUS32);
tmp |= STATUS_AD_MASK | (ARCV2_IRQ_DEF_PRIO << 1);
tmp &= ~STATUS_IE_MASK;
asm volatile("kflag %0 \n"::"r"(tmp));
}
static void utlb_invalidate(void)
{
#if (CONFIG_ARC_MMU_VER >= 2)
#if (CONFIG_ARC_MMU_VER == 2)
/* MMU v2 introduced the uTLB Flush command.
* There was however an obscure hardware bug, where uTLB flush would
* fail when a prior probe for J-TLB (both totally unrelated) would
* return lkup err - because the entry didnt exist in MMU.
* The Workround was to set Index reg with some valid value, prior to
* flush. This was fixed in MMU v3 hence not needed any more
*/
unsigned int idx;
/* make sure INDEX Reg is valid */
idx = read_aux_reg(ARC_REG_TLBINDEX);
/* If not write some dummy val */
if (unlikely(idx & TLB_LKUP_ERR))
write_aux_reg(ARC_REG_TLBINDEX, 0xa);
#endif
write_aux_reg(ARC_REG_TLBCOMMAND, TLBIVUTLB);
#endif
}
/*
* Common Helper for Line Operations on {I,D}-Cache
*/
static inline void __cache_line_loop(unsigned long paddr, unsigned long vaddr,
unsigned long sz, const int cacheop)
{
unsigned int aux_cmd, aux_tag;
int num_lines;
const int full_page_op = __builtin_constant_p(sz) && sz == PAGE_SIZE;
if (cacheop == OP_INV_IC) {
aux_cmd = ARC_REG_IC_IVIL;
#if (CONFIG_ARC_MMU_VER > 2)
aux_tag = ARC_REG_IC_PTAG;
#endif
}
else {
/* d$ cmd: INV (discard or wback-n-discard) OR FLUSH (wback) */
aux_cmd = cacheop & OP_INV ? ARC_REG_DC_IVDL : ARC_REG_DC_FLDL;
#if (CONFIG_ARC_MMU_VER > 2)
aux_tag = ARC_REG_DC_PTAG;
#endif
}
/* Ensure we properly floor/ceil the non-line aligned/sized requests
* and have @paddr - aligned to cache line and integral @num_lines.
* This however can be avoided for page sized since:
* -@paddr will be cache-line aligned already (being page aligned)
* -@sz will be integral multiple of line size (being page sized).
*/
if (!full_page_op) {
sz += paddr & ~CACHE_LINE_MASK;
paddr &= CACHE_LINE_MASK;
vaddr &= CACHE_LINE_MASK;
}
num_lines = DIV_ROUND_UP(sz, L1_CACHE_BYTES);
#if (CONFIG_ARC_MMU_VER <= 2)
/* MMUv2 and before: paddr contains stuffed vaddrs bits */
paddr |= (vaddr >> PAGE_SHIFT) & 0x1F;
#else
/* if V-P const for loop, PTAG can be written once outside loop */
if (full_page_op)
write_aux_reg(aux_tag, paddr);
#endif
while (num_lines-- > 0) {
#if (CONFIG_ARC_MMU_VER > 2)
/* MMUv3, cache ops require paddr seperately */
if (!full_page_op) {
write_aux_reg(aux_tag, paddr);
paddr += L1_CACHE_BYTES;
}
write_aux_reg(aux_cmd, vaddr);
vaddr += L1_CACHE_BYTES;
#else
write_aux_reg(aux_cmd, paddr);
paddr += L1_CACHE_BYTES;
#endif
}
}
/*
* Operation on Entire D-Cache
* @cacheop = {OP_INV, OP_FLUSH, OP_FLUSH_N_INV}
* Note that constant propagation ensures all the checks are gone
* in generated code
*/
static inline void __dc_entire_op(const int cacheop)
{
unsigned int tmp = tmp;
int aux;
if (cacheop == OP_FLUSH_N_INV) {
/* Dcache provides 2 cmd: FLUSH or INV
* INV inturn has sub-modes: DISCARD or FLUSH-BEFORE
* flush-n-inv is achieved by INV cmd but with IM=1
* Default INV sub-mode is DISCARD, which needs to be toggled
*/
tmp = read_aux_reg(ARC_REG_DC_CTRL);
write_aux_reg(ARC_REG_DC_CTRL, tmp | DC_CTRL_INV_MODE_FLUSH);
}
if (cacheop & OP_INV) /* Inv or flush-n-inv use same cmd reg */
aux = ARC_REG_DC_IVDC;
else
aux = ARC_REG_DC_FLSH;
write_aux_reg(aux, 0x1);
if (cacheop & OP_FLUSH) /* flush / flush-n-inv both wait */
wait_for_flush();
/* Switch back the DISCARD ONLY Invalidate mode */
if (cacheop == OP_FLUSH_N_INV)
write_aux_reg(ARC_REG_DC_CTRL, tmp & ~DC_CTRL_INV_MODE_FLUSH);
}
/*
* D-Cache : Per Line INV (discard or wback+discard) or FLUSH (wback)
*/
static inline void __dc_line_op(unsigned long paddr, unsigned long vaddr,
unsigned long sz, const int cacheop)
{
unsigned long flags, tmp = tmp;
local_irq_save(flags);
if (cacheop == OP_FLUSH_N_INV) {
/*
* Dcache provides 2 cmd: FLUSH or INV
* INV inturn has sub-modes: DISCARD or FLUSH-BEFORE
* flush-n-inv is achieved by INV cmd but with IM=1
* Default INV sub-mode is DISCARD, which needs to be toggled
*/
tmp = read_aux_reg(ARC_REG_DC_CTRL);
write_aux_reg(ARC_REG_DC_CTRL, tmp | DC_CTRL_INV_MODE_FLUSH);
}
__cache_line_loop(paddr, vaddr, sz, cacheop);
if (cacheop & OP_FLUSH) /* flush / flush-n-inv both wait */
wait_for_flush();
/* Switch back the DISCARD ONLY Invalidate mode */
if (cacheop == OP_FLUSH_N_INV)
write_aux_reg(ARC_REG_DC_CTRL, tmp & ~DC_CTRL_INV_MODE_FLUSH);
local_irq_restore(flags);
}
/*
* set 32bit TIMER1 to keep counting monotonically and wraparound
*/
int __cpuinit arc_counter_setup(void)
{
write_aux_reg(ARC_REG_TIMER1_LIMIT, ARC_TIMER_MAX);
write_aux_reg(ARC_REG_TIMER1_CNT, 0);
write_aux_reg(ARC_REG_TIMER1_CTRL, TIMER_CTRL_NH);
return is_usable_as_clocksource();
}
/*
* set 32bit TIMER1 to keep counting monotonically and wraparound
*/
int arc_counter_setup(void)
{
write_aux_reg(ARC_REG_TIMER1_LIMIT, ARC_TIMER_MAX);
write_aux_reg(ARC_REG_TIMER1_CNT, 0);
write_aux_reg(ARC_REG_TIMER1_CTRL, TIMER_CTRL_NH);
/* Not usable in SMP */
return !IS_ENABLED(CONFIG_SMP);
}
static inline unsigned int tlb_entry_lkup(unsigned long vaddr_n_asid)
{
unsigned int idx;
write_aux_reg(ARC_REG_TLBPD0, vaddr_n_asid);
write_aux_reg(ARC_REG_TLBCOMMAND, TLBProbe);
idx = read_aux_reg(ARC_REG_TLBINDEX);
return idx;
}
void arcv2_irq_enable(struct irq_data *data)
{
/* set default priority */
write_aux_reg(AUX_IRQ_SELECT, data->hwirq);
write_aux_reg(AUX_IRQ_PRIORITY, ARCV2_IRQ_DEF_PRIO);
/*
* hw auto enables (linux unmask) all by default
* So no need to do IRQ_ENABLE here
* XXX: However OSCI LAN need it
*/
write_aux_reg(AUX_IRQ_ENABLE, 1);
}
/*
* 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)));
}
int arc_counter_setup(void)
{
write_aux_reg(AUX_RTC_CTRL, 1);
/* Not usable in SMP */
return !IS_ENABLED(CONFIG_SMP);
}
/*
* In HS38x (MMU v4), although icache is VIPT, only paddr is needed for cache
* maintenance ops (in IVIL reg), as long as icache doesn't alias.
*
* For Aliasing icache, vaddr is also needed (in IVIL), while paddr is
* specified in PTAG (similar to MMU v3)
*/
static inline
void __cache_line_loop_v4(unsigned long paddr, unsigned long vaddr,
unsigned long sz, const int cacheop)
{
unsigned int aux_cmd;
int num_lines;
const int full_page_op = __builtin_constant_p(sz) && sz == PAGE_SIZE;
if (cacheop == OP_INV_IC) {
aux_cmd = ARC_REG_IC_IVIL;
} else {
/* d$ cmd: INV (discard or wback-n-discard) OR FLUSH (wback) */
aux_cmd = cacheop & OP_INV ? ARC_REG_DC_IVDL : ARC_REG_DC_FLDL;
}
/* Ensure we properly floor/ceil the non-line aligned/sized requests
* and have @paddr - aligned to cache line and integral @num_lines.
* This however can be avoided for page sized since:
* -@paddr will be cache-line aligned already (being page aligned)
* -@sz will be integral multiple of line size (being page sized).
*/
if (!full_page_op) {
sz += paddr & ~CACHE_LINE_MASK;
paddr &= CACHE_LINE_MASK;
}
num_lines = DIV_ROUND_UP(sz, L1_CACHE_BYTES);
while (num_lines-- > 0) {
write_aux_reg(aux_cmd, paddr);
paddr += L1_CACHE_BYTES;
}
}
static int __init arc_cs_setup_rtc(struct device_node *node)
{
struct bcr_timer timer;
int ret;
READ_BCR(ARC_REG_TIMERS_BCR, timer);
if (!timer.rtc) {
pr_warn("Local-64-bit-Ctr clocksource not detected");
return -ENXIO;
}
/* Local to CPU hence not usable in SMP */
if (IS_ENABLED(CONFIG_SMP)) {
pr_warn("Local-64-bit-Ctr not usable in SMP");
return -EINVAL;
}
ret = arc_get_timer_clk(node);
if (ret)
return ret;
write_aux_reg(AUX_RTC_CTRL, 1);
return clocksource_register_hz(&arc_counter_rtc, arc_timer_freq);
}
/*
* Early Hardware specific Interrupt setup
* -Called very early (start_kernel -> setup_arch -> setup_processor)
* -Platform Independent (must for any ARC700)
* -Needed for each CPU (hence not foldable into init_IRQ)
*
* what it does ?
* -setup Vector Table Base Reg - in case Linux not linked at 0x8000_0000
* -Disable all IRQs (on CPU side)
* -Optionally, setup the High priority Interrupts as Level 2 IRQs
*/
void arc_init_IRQ(void)
{
int level_mask = 0;
/* Disable all IRQs: enable them as devices request */
write_aux_reg(AUX_IENABLE, 0);
/* setup any high priority Interrupts (Level2 in ARCompact jargon) */
level_mask |= IS_ENABLED(CONFIG_ARC_IRQ3_LV2) << 3;
level_mask |= IS_ENABLED(CONFIG_ARC_IRQ5_LV2) << 5;
level_mask |= IS_ENABLED(CONFIG_ARC_IRQ6_LV2) << 6;
if (level_mask) {
pr_info("Level-2 interrupts bitset %x\n", level_mask);
write_aux_reg(AUX_IRQ_LEV, level_mask);
}
}
static inline
void __cache_line_loop_v3(unsigned long paddr, unsigned long vaddr,
unsigned long sz, const int op)
{
unsigned int aux_cmd, aux_tag;
int num_lines;
const int full_page = __builtin_constant_p(sz) && sz == PAGE_SIZE;
if (op == OP_INV_IC) {
aux_cmd = ARC_REG_IC_IVIL;
aux_tag = ARC_REG_IC_PTAG;
} else {
aux_cmd = op & OP_INV ? ARC_REG_DC_IVDL : ARC_REG_DC_FLDL;
aux_tag = ARC_REG_DC_PTAG;
}
/* Ensure we properly floor/ceil the non-line aligned/sized requests
* and have @paddr - aligned to cache line and integral @num_lines.
* This however can be avoided for page sized since:
* -@paddr will be cache-line aligned already (being page aligned)
* -@sz will be integral multiple of line size (being page sized).
*/
if (!full_page) {
sz += paddr & ~CACHE_LINE_MASK;
paddr &= CACHE_LINE_MASK;
vaddr &= CACHE_LINE_MASK;
}
num_lines = DIV_ROUND_UP(sz, L1_CACHE_BYTES);
/*
* MMUv3, cache ops require paddr in PTAG reg
* if V-P const for loop, PTAG can be written once outside loop
*/
if (full_page)
write_aux_reg(aux_tag, paddr);
while (num_lines-- > 0) {
if (!full_page) {
write_aux_reg(aux_tag, paddr);
paddr += L1_CACHE_BYTES;
}
write_aux_reg(aux_cmd, vaddr);
vaddr += L1_CACHE_BYTES;
}
}
static void arc_irq_unmask(struct irq_data *data)
{
unsigned int ienb;
ienb = read_aux_reg(AUX_IENABLE);
ienb |= (1 << data->irq);
write_aux_reg(AUX_IENABLE, ienb);
}
static void __after_dc_op(const int op, unsigned int reg)
{
if (op & OP_FLUSH) /* flush / flush-n-inv both wait */
while (read_aux_reg(ARC_REG_DC_CTRL) & DC_CTRL_FLUSH_STATUS);
/* Switch back to default Invalidate mode */
if (op == OP_FLUSH_N_INV)
write_aux_reg(ARC_REG_DC_CTRL, reg & ~DC_CTRL_INV_MODE_FLUSH);
}
static void __init arc_cs_setup_timer1(struct device_node *node)
{
int ret;
/* Local to CPU hence not usable in SMP */
if (IS_ENABLED(CONFIG_SMP))
return;
ret = arc_get_timer_clk(node);
if (ret)
return;
write_aux_reg(ARC_REG_TIMER1_LIMIT, ARC_TIMER_MAX);
write_aux_reg(ARC_REG_TIMER1_CNT, 0);
write_aux_reg(ARC_REG_TIMER1_CTRL, TIMER_CTRL_NH);
clocksource_register_hz(&arc_counter_timer1, arc_timer_freq);
}
static void nps400_irq_unmask(struct irq_data *irqd)
{
unsigned int ienb;
unsigned int irq = irqd_to_hwirq(irqd);
ienb = read_aux_reg(AUX_IENABLE);
ienb |= (1 << irq);
write_aux_reg(AUX_IENABLE, ienb);
}
/***********************************************************
* Machine specific helper for per line I-Cache invalidate.
*/
static void __ic_line_inv_vaddr(unsigned long paddr, unsigned long vaddr,
unsigned long sz)
{
unsigned long flags;
int num_lines;
/*
* Ensure we properly floor/ceil the non-line aligned/sized requests:
* However page sized flushes can be compile time optimised.
* -@paddr will be cache-line aligned already (being page aligned)
* -@sz will be integral multiple of line size (being page sized).
*/
if (!(__builtin_constant_p(sz) && sz == PAGE_SIZE)) {
sz += paddr & ~ICACHE_LINE_MASK;
paddr &= ICACHE_LINE_MASK;
vaddr &= ICACHE_LINE_MASK;
}
num_lines = DIV_ROUND_UP(sz, ARC_ICACHE_LINE_LEN);
#if (CONFIG_ARC_MMU_VER <= 2)
/* bits 17:13 of vaddr go as bits 4:0 of paddr */
paddr |= (vaddr >> PAGE_SHIFT) & 0x1F;
#endif
local_irq_save(flags);
while (num_lines-- > 0) {
#if (CONFIG_ARC_MMU_VER > 2)
/* tag comes from phy addr */
write_aux_reg(ARC_REG_IC_PTAG, paddr);
/* index bits come from vaddr */
write_aux_reg(ARC_REG_IC_IVIL, vaddr);
vaddr += ARC_ICACHE_LINE_LEN;
#else
/* paddr contains stuffed vaddrs bits */
write_aux_reg(ARC_REG_IC_IVIL, paddr);
#endif
paddr += ARC_ICACHE_LINE_LEN;
}
local_irq_restore(flags);
}
noinline void slc_op(unsigned long paddr, unsigned long sz, const int op)
{
#ifdef CONFIG_ISA_ARCV2
unsigned long flags;
unsigned int ctrl;
local_irq_save(flags);
/*
* The Region Flush operation is specified by CTRL.RGN_OP[11..9]
* - b'000 (default) is Flush,
* - b'001 is Invalidate if CTRL.IM == 0
* - b'001 is Flush-n-Invalidate if CTRL.IM == 1
*/
ctrl = read_aux_reg(ARC_REG_SLC_CTRL);
/* Don't rely on default value of IM bit */
if (!(op & OP_FLUSH)) /* i.e. OP_INV */
ctrl &= ~SLC_CTRL_IM; /* clear IM: Disable flush before Inv */
else
ctrl |= SLC_CTRL_IM;
if (op & OP_INV)
ctrl |= SLC_CTRL_RGN_OP_INV; /* Inv or flush-n-inv */
else
ctrl &= ~SLC_CTRL_RGN_OP_INV;
write_aux_reg(ARC_REG_SLC_CTRL, ctrl);
/*
* Lower bits are ignored, no need to clip
* END needs to be setup before START (latter triggers the operation)
* END can't be same as START, so add (l2_line_sz - 1) to sz
*/
write_aux_reg(ARC_REG_SLC_RGN_END, (paddr + sz + l2_line_sz - 1));
write_aux_reg(ARC_REG_SLC_RGN_START, paddr);
while (read_aux_reg(ARC_REG_SLC_CTRL) & SLC_CTRL_BUSY);
local_irq_restore(flags);
#endif
}
static void nps400_irq_eoi_global(struct irq_data *irqd)
{
unsigned int __maybe_unused irq = irqd_to_hwirq(irqd);
write_aux_reg(CTOP_AUX_IACK, 1 << irq);
/* Don't ack GIC before all device access attempts are done */
mb();
nps_ack_gic();
}
/*
* Early Hardware specific Interrupt setup
* -Called very early (start_kernel -> setup_arch -> setup_processor)
* -Platform Independent (must for any ARC700)
* -Needed for each CPU (hence not foldable into init_IRQ)
*
* what it does ?
* -Disable all IRQs (on CPU side)
* -Optionally, setup the High priority Interrupts as Level 2 IRQs
*/
void arc_init_IRQ(void)
{
int level_mask = 0;
/* Disable all IRQs: enable them as devices request */
write_aux_reg(AUX_IENABLE, 0);
/* setup any high priority Interrupts (Level2 in ARCompact jargon) */
level_mask |= IS_ENABLED(CONFIG_ARC_IRQ3_LV2) << 3;
level_mask |= IS_ENABLED(CONFIG_ARC_IRQ5_LV2) << 5;
level_mask |= IS_ENABLED(CONFIG_ARC_IRQ6_LV2) << 6;
/*
* Write to register, even if no LV2 IRQs configured to reset it
* in case bootloader had mucked with it
*/
write_aux_reg(AUX_IRQ_LEV, level_mask);
if (level_mask)
pr_info("Level-2 interrupts bitset %x\n", level_mask);
}
static void nps_clkevent_add_thread(unsigned long delta)
{
int thread;
unsigned int cflags, enabled_threads;
hw_schd_save(&cflags);
/* add thread to TSI1 */
thread = read_aux_reg(CTOP_AUX_THREAD_ID);
enabled_threads = read_aux_reg(NPS_REG_TIMER0_TSI);
enabled_threads |= (1 << thread);
write_aux_reg(NPS_REG_TIMER0_TSI, enabled_threads);
/* set next timer event */
write_aux_reg(NPS_REG_TIMER0_LIMIT, delta);
write_aux_reg(NPS_REG_TIMER0_CNT, 0);
write_aux_reg(NPS_REG_TIMER0_CTRL,
TIMER0_CTRL_IE | TIMER0_CTRL_NH);
hw_schd_restore(cflags);
}
static inline void __before_dc_op(const int op)
{
if (op == OP_FLUSH_N_INV) {
/* Dcache provides 2 cmd: FLUSH or INV
* INV inturn has sub-modes: DISCARD or FLUSH-BEFORE
* flush-n-inv is achieved by INV cmd but with IM=1
* So toggle INV sub-mode depending on op request and default
*/
const unsigned int ctl = ARC_REG_DC_CTRL;
write_aux_reg(ctl, read_aux_reg(ctl) | DC_CTRL_INV_MODE_FLUSH);
}
}
/*
* Per Line Operation on D-Cache
* Doesn't deal with type-of-op/IRQ-disabling/waiting-for-flush-to-complete
* It's sole purpose is to help gcc generate ZOL
* (aliasing VIPT dcache flushing needs both vaddr and paddr)
*/
static inline void __dc_line_loop(unsigned long paddr, unsigned long vaddr,
unsigned long sz, const int aux_reg)
{
int num_lines;
/* Ensure we properly floor/ceil the non-line aligned/sized requests
* and have @paddr - aligned to cache line and integral @num_lines.
* This however can be avoided for page sized since:
* -@paddr will be cache-line aligned already (being page aligned)
* -@sz will be integral multiple of line size (being page sized).
*/
if (!(__builtin_constant_p(sz) && sz == PAGE_SIZE)) {
sz += paddr & ~DCACHE_LINE_MASK;
paddr &= DCACHE_LINE_MASK;
vaddr &= DCACHE_LINE_MASK;
}
num_lines = DIV_ROUND_UP(sz, ARC_DCACHE_LINE_LEN);
#if (CONFIG_ARC_MMU_VER <= 2)
paddr |= (vaddr >> PAGE_SHIFT) & 0x1F;
#endif
while (num_lines-- > 0) {
#if (CONFIG_ARC_MMU_VER > 2)
/*
* Just as for I$, in MMU v3, D$ ops also require
* "tag" bits in DC_PTAG, "index" bits in FLDL,IVDL ops
*/
write_aux_reg(ARC_REG_DC_PTAG, paddr);
write_aux_reg(aux_reg, vaddr);
vaddr += ARC_DCACHE_LINE_LEN;
#else
/* paddr contains stuffed vaddrs bits */
write_aux_reg(aux_reg, paddr);
#endif
paddr += ARC_DCACHE_LINE_LEN;
}
}