From 4d1df88b63c68f84a3c1a84a7f88cb8e6fa99490 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Tue, 11 Apr 2017 17:29:59 +0200 Subject: [PATCH] ppc/pnv: Add support for POWER8+ LPC Controller MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit It adds the Naples chip which supports proper LPC interrupts via the LPC controller rather than via an external CPLD. Signed-off-by: Benjamin Herrenschmidt [clg: - updated for qemu-2.9 - ported on latest PowerNV patchset - moved the IRQ handler in pnv_lpc.c - introduced pnv_lpc_isa_irq_create() to create the ISA IRQs ] Signed-off-by: Cédric Le Goater Signed-off-by: David Gibson --- hw/ppc/pnv.c | 45 +++---------------- hw/ppc/pnv_lpc.c | 97 +++++++++++++++++++++++++++++++++++++++- include/hw/ppc/pnv_lpc.h | 8 ++++ 3 files changed, 108 insertions(+), 42 deletions(-) diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c index 16f32c9bbd..27589b91d1 100644 --- a/hw/ppc/pnv.c +++ b/hw/ppc/pnv.c @@ -346,36 +346,6 @@ static void ppc_powernv_reset(void) cpu_physical_memory_write(PNV_FDT_ADDR, fdt, fdt_totalsize(fdt)); } -/* If we don't use the built-in LPC interrupt deserializer, we need - * to provide a set of qirqs for the ISA bus or things will go bad. - * - * Most machines using pre-Naples chips (without said deserializer) - * have a CPLD that will collect the SerIRQ and shoot them as a - * single level interrupt to the P8 chip. So let's setup a hook - * for doing just that. - */ -static void pnv_lpc_isa_irq_handler_cpld(void *opaque, int n, int level) -{ - PnvMachineState *pnv = POWERNV_MACHINE(qdev_get_machine()); - uint32_t old_state = pnv->cpld_irqstate; - PnvChip *chip = opaque; - - if (level) { - pnv->cpld_irqstate |= 1u << n; - } else { - pnv->cpld_irqstate &= ~(1u << n); - } - if (pnv->cpld_irqstate != old_state) { - pnv_psi_irq_set(&chip->psi, PSIHB_IRQ_EXTERNAL, - pnv->cpld_irqstate != 0); - } -} - -static void pnv_lpc_isa_irq_handler(void *opaque, int n, int level) -{ - /* XXX TODO */ -} - static ISABus *pnv_isa_create(PnvChip *chip) { PnvLpcController *lpc = &chip->lpc; @@ -390,16 +360,7 @@ static ISABus *pnv_isa_create(PnvChip *chip) isa_bus = isa_bus_new(NULL, &lpc->isa_mem, &lpc->isa_io, &error_fatal); - /* Not all variants have a working serial irq decoder. If not, - * handling of LPC interrupts becomes a platform issue (some - * platforms have a CPLD to do it). - */ - if (pcc->chip_type == PNV_CHIP_POWER8NVL) { - irqs = qemu_allocate_irqs(pnv_lpc_isa_irq_handler, chip, ISA_NUM_IRQS); - } else { - irqs = qemu_allocate_irqs(pnv_lpc_isa_irq_handler_cpld, chip, - ISA_NUM_IRQS); - } + irqs = pnv_lpc_isa_irq_create(lpc, pcc->chip_type, ISA_NUM_IRQS); isa_bus_irqs(isa_bus, irqs); return isa_bus; @@ -699,6 +660,10 @@ static void pnv_chip_init(Object *obj) object_property_add_child(obj, "occ", OBJECT(&chip->occ), NULL); object_property_add_const_link(OBJECT(&chip->occ), "psi", OBJECT(&chip->psi), &error_abort); + + /* The LPC controller needs PSI to generate interrupts */ + object_property_add_const_link(OBJECT(&chip->lpc), "psi", + OBJECT(&chip->psi), &error_abort); } static void pnv_chip_icp_realize(PnvChip *chip, Error **errp) diff --git a/hw/ppc/pnv_lpc.c b/hw/ppc/pnv_lpc.c index 78db52415b..5d20c15e67 100644 --- a/hw/ppc/pnv_lpc.c +++ b/hw/ppc/pnv_lpc.c @@ -250,6 +250,34 @@ static const MemoryRegionOps pnv_lpc_xscom_ops = { .endianness = DEVICE_BIG_ENDIAN, }; +static void pnv_lpc_eval_irqs(PnvLpcController *lpc) +{ + bool lpc_to_opb_irq = false; + + /* Update LPC controller to OPB line */ + if (lpc->lpc_hc_irqser_ctrl & LPC_HC_IRQSER_EN) { + uint32_t irqs; + + irqs = lpc->lpc_hc_irqstat & lpc->lpc_hc_irqmask; + lpc_to_opb_irq = (irqs != 0); + } + + /* We don't honor the polarity register, it's pointless and unused + * anyway + */ + if (lpc_to_opb_irq) { + lpc->opb_irq_input |= OPB_MASTER_IRQ_LPC; + } else { + lpc->opb_irq_input &= ~OPB_MASTER_IRQ_LPC; + } + + /* Update OPB internal latch */ + lpc->opb_irq_stat |= lpc->opb_irq_input & lpc->opb_irq_mask; + + /* Reflect the interrupt */ + pnv_psi_irq_set(lpc->psi, PSIHB_IRQ_LPC_I2C, lpc->opb_irq_stat != 0); +} + static uint64_t lpc_hc_read(void *opaque, hwaddr addr, unsigned size) { PnvLpcController *lpc = opaque; @@ -300,12 +328,15 @@ static void lpc_hc_write(void *opaque, hwaddr addr, uint64_t val, break; case LPC_HC_IRQSER_CTRL: lpc->lpc_hc_irqser_ctrl = val; + pnv_lpc_eval_irqs(lpc); break; case LPC_HC_IRQMASK: lpc->lpc_hc_irqmask = val; + pnv_lpc_eval_irqs(lpc); break; case LPC_HC_IRQSTAT: lpc->lpc_hc_irqstat &= ~val; + pnv_lpc_eval_irqs(lpc); break; case LPC_HC_ERROR_ADDRESS: break; @@ -363,14 +394,15 @@ static void opb_master_write(void *opaque, hwaddr addr, switch (addr) { case OPB_MASTER_LS_IRQ_STAT: lpc->opb_irq_stat &= ~val; + pnv_lpc_eval_irqs(lpc); break; case OPB_MASTER_LS_IRQ_MASK: - /* XXX Filter out reserved bits */ lpc->opb_irq_mask = val; + pnv_lpc_eval_irqs(lpc); break; case OPB_MASTER_LS_IRQ_POL: - /* XXX Filter out reserved bits */ lpc->opb_irq_pol = val; + pnv_lpc_eval_irqs(lpc); break; case OPB_MASTER_LS_IRQ_INPUT: /* Read only */ @@ -398,6 +430,8 @@ static const MemoryRegionOps opb_master_ops = { static void pnv_lpc_realize(DeviceState *dev, Error **errp) { PnvLpcController *lpc = PNV_LPC(dev); + Object *obj; + Error *error = NULL; /* Reg inits */ lpc->lpc_hc_fw_rd_acc_size = LPC_HC_FW_RD_4B; @@ -441,6 +475,15 @@ static void pnv_lpc_realize(DeviceState *dev, Error **errp) pnv_xscom_region_init(&lpc->xscom_regs, OBJECT(dev), &pnv_lpc_xscom_ops, lpc, "xscom-lpc", PNV_XSCOM_LPC_SIZE); + + /* get PSI object from chip */ + obj = object_property_get_link(OBJECT(dev), "psi", &error); + if (!obj) { + error_setg(errp, "%s: required link 'psi' not found: %s", + __func__, error_get_pretty(error)); + return; + } + lpc->psi = PNV_PSI(obj); } static void pnv_lpc_class_init(ObjectClass *klass, void *data) @@ -470,3 +513,53 @@ static void pnv_lpc_register_types(void) } type_init(pnv_lpc_register_types) + +/* If we don't use the built-in LPC interrupt deserializer, we need + * to provide a set of qirqs for the ISA bus or things will go bad. + * + * Most machines using pre-Naples chips (without said deserializer) + * have a CPLD that will collect the SerIRQ and shoot them as a + * single level interrupt to the P8 chip. So let's setup a hook + * for doing just that. + */ +static void pnv_lpc_isa_irq_handler_cpld(void *opaque, int n, int level) +{ + PnvMachineState *pnv = POWERNV_MACHINE(qdev_get_machine()); + uint32_t old_state = pnv->cpld_irqstate; + PnvLpcController *lpc = PNV_LPC(opaque); + + if (level) { + pnv->cpld_irqstate |= 1u << n; + } else { + pnv->cpld_irqstate &= ~(1u << n); + } + + if (pnv->cpld_irqstate != old_state) { + pnv_psi_irq_set(lpc->psi, PSIHB_IRQ_EXTERNAL, pnv->cpld_irqstate != 0); + } +} + +static void pnv_lpc_isa_irq_handler(void *opaque, int n, int level) +{ + PnvLpcController *lpc = PNV_LPC(opaque); + + /* The Naples HW latches the 1 levels, clearing is done by SW */ + if (level) { + lpc->lpc_hc_irqstat |= LPC_HC_IRQ_SERIRQ0 >> n; + pnv_lpc_eval_irqs(lpc); + } +} + +qemu_irq *pnv_lpc_isa_irq_create(PnvLpcController *lpc, int chip_type, + int nirqs) +{ + /* Not all variants have a working serial irq decoder. If not, + * handling of LPC interrupts becomes a platform issue (some + * platforms have a CPLD to do it). + */ + if (chip_type == PNV_CHIP_POWER8NVL) { + return qemu_allocate_irqs(pnv_lpc_isa_irq_handler, lpc, nirqs); + } else { + return qemu_allocate_irqs(pnv_lpc_isa_irq_handler_cpld, lpc, nirqs); + } +} diff --git a/include/hw/ppc/pnv_lpc.h b/include/hw/ppc/pnv_lpc.h index 38e5506975..ccf969af94 100644 --- a/include/hw/ppc/pnv_lpc.h +++ b/include/hw/ppc/pnv_lpc.h @@ -23,6 +23,8 @@ #define PNV_LPC(obj) \ OBJECT_CHECK(PnvLpcController, (obj), TYPE_PNV_LPC) +typedef struct PnvPsi PnvPsi; + typedef struct PnvLpcController { DeviceState parent; @@ -62,6 +64,12 @@ typedef struct PnvLpcController { /* XSCOM registers */ MemoryRegion xscom_regs; + + /* PSI to generate interrupts */ + PnvPsi *psi; } PnvLpcController; +qemu_irq *pnv_lpc_isa_irq_create(PnvLpcController *lpc, int chip_type, + int nirqs); + #endif /* _PPC_PNV_LPC_H */