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Thu, 13 Dec 2018 12:29:03 GMT From: Przemyslaw Gaj To: , Subject: [PATCH 2/2] i3c: master: cdns: add support for mastership request to Cadence I3C master driver. 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org This patch adds support for mastership request to Cadence I3C master driver. Signed-off-by: Przemyslaw Gaj --- drivers/i3c/master/i3c-master-cdns.c | 316 ++++++++++++++++++++++++++++++----- 1 file changed, 271 insertions(+), 45 deletions(-) diff --git a/drivers/i3c/master/i3c-master-cdns.c b/drivers/i3c/master/i3c-master-cdns.c index 02a8297..a33f3a6 100644 --- a/drivers/i3c/master/i3c-master-cdns.c +++ b/drivers/i3c/master/i3c-master-cdns.c @@ -157,6 +157,7 @@ #define SLV_IMR 0x48 #define SLV_ICR 0x4c #define SLV_ISR 0x50 +#define SLV_INT_DEFSLVS BIT(21) #define SLV_INT_TM BIT(20) #define SLV_INT_ERROR BIT(19) #define SLV_INT_EVENT_UP BIT(18) @@ -390,6 +391,10 @@ struct cdns_i3c_xfer { struct cdns_i3c_master { struct work_struct hj_work; + struct { + struct work_struct handover_work; + u32 ibir; + } mastership; struct i3c_master_controller base; u32 free_rr_slots; unsigned int maxdevs; @@ -664,6 +669,89 @@ static void cdns_i3c_master_unqueue_xfer(struct cdns_i3c_master *master, spin_unlock_irqrestore(&master->xferqueue.lock, flags); } +static void +cdns_i3c_master_i3c_dev_rr_to_info(struct cdns_i3c_master *master, + unsigned int slot, + struct i3c_device_info *info) +{ + u32 rr; + + memset(info, 0, sizeof(*info)); + rr = readl(master->regs + DEV_ID_RR0(slot)); + info->dyn_addr = DEV_ID_RR0_GET_DEV_ADDR(rr); + rr = readl(master->regs + DEV_ID_RR2(slot)); + info->dcr = rr; + info->bcr = rr >> 8; + info->pid = rr >> 16; + info->pid |= (u64)readl(master->regs + DEV_ID_RR1(slot)) << 16; +} + +static void +cdns_i3c_master_i2c_dev_rr_to_boardinfo(struct cdns_i3c_master *master, + unsigned int slot, + struct i2c_dev_boardinfo *info) +{ + u32 rr; + + memset(info, 0, sizeof(*info)); + rr = readl(master->regs + DEV_ID_RR0(slot)); + info->base.addr = DEV_ID_RR0_GET_DEV_ADDR(rr); + rr = readl(master->regs + DEV_ID_RR2(slot)); + info->lvr = rr; +} + +static +int cdns_i3c_sec_master_request_mastership(struct i3c_master_controller *m) +{ + struct cdns_i3c_master *master = to_cdns_i3c_master(m); + u32 status; + int ret; + + status = readl(master->regs + MST_STATUS0); + if (status & MST_STATUS0_MASTER_MODE) + return -EEXIST; + + status = readl(master->regs + SLV_STATUS1); + if (status & SLV_STATUS1_MR_DIS) + return -EBUSY; + + writel(readl(master->regs + CTRL) | CTRL_MST_INIT | CTRL_MST_ACK, + master->regs + CTRL); + + writel(SLV_INT_MR_DONE, master->regs + SLV_IER); + + ret = readl_poll_timeout(master->regs + MST_STATUS0, status, + status & MST_STATUS0_MASTER_MODE, 100, + 1000000); + + return ret; +} + +static void cdns_i3c_master_update_devs(struct i3c_master_controller *m) +{ + struct cdns_i3c_master *master = to_cdns_i3c_master(m); + u32 val, newdevs; + int slot; + struct i3c_device_info i3c_info; + struct i2c_dev_boardinfo i2c_info; + + newdevs = readl(master->regs + DEVS_CTRL) & DEVS_CTRL_DEVS_ACTIVE_MASK; + for (slot = 1; slot <= master->maxdevs; slot++) { + val = readl(master->regs + DEV_ID_RR0(slot)); + + if ((newdevs & BIT(slot)) && (val & DEV_ID_RR0_IS_I3C)) { + cdns_i3c_master_i3c_dev_rr_to_info(master, slot, + &i3c_info); + i3c_master_add_i3c_dev_locked(m, i3c_info.dyn_addr); + } else if ((newdevs & BIT(slot)) && + !(val & DEV_ID_RR0_IS_I3C)) { + cdns_i3c_master_i2c_dev_rr_to_boardinfo(master, slot, + &i2c_info); + i3c_master_add_i2c_dev(m, &i2c_info); + } + } +} + static enum i3c_error_code cdns_i3c_cmd_get_err(struct cdns_i3c_cmd *cmd) { switch (cmd->error) { @@ -945,6 +1033,8 @@ static int cdns_i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev, return 0; } +static int cdns_i3c_master_enable_mastership(struct i3c_dev_desc *dev); + static int cdns_i3c_master_attach_i3c_dev(struct i3c_dev_desc *dev) { struct i3c_master_controller *m = i3c_dev_get_master(dev); @@ -1045,22 +1135,6 @@ static void cdns_i3c_master_bus_cleanup(struct i3c_master_controller *m) cdns_i3c_master_disable(master); } -static void cdns_i3c_master_dev_rr_to_info(struct cdns_i3c_master *master, - unsigned int slot, - struct i3c_device_info *info) -{ - u32 rr; - - memset(info, 0, sizeof(*info)); - rr = readl(master->regs + DEV_ID_RR0(slot)); - info->dyn_addr = DEV_ID_RR0_GET_DEV_ADDR(rr); - rr = readl(master->regs + DEV_ID_RR2(slot)); - info->dcr = rr; - info->bcr = rr >> 8; - info->pid = rr >> 16; - info->pid |= (u64)readl(master->regs + DEV_ID_RR1(slot)) << 16; -} - static void cdns_i3c_master_upd_i3c_scl_lim(struct cdns_i3c_master *master) { struct i3c_master_controller *m = &master->base; @@ -1259,15 +1333,17 @@ static int cdns_i3c_master_bus_init(struct i3c_master_controller *m) prescl1 = PRESCL_CTRL1_OD_LOW(ncycles); writel(prescl1, master->regs + PRESCL_CTRL1); - /* Get an address for the master. */ - ret = i3c_master_get_free_addr(m, 0); - if (ret < 0) - return ret; + if (!m->secondary) { + /* Get an address for the master. */ + ret = i3c_master_get_free_addr(m, 0); + if (ret < 0) + return ret; - writel(prepare_rr0_dev_address(ret) | DEV_ID_RR0_IS_I3C, - master->regs + DEV_ID_RR0(0)); + writel(prepare_rr0_dev_address(ret) | DEV_ID_RR0_IS_I3C, + master->regs + DEV_ID_RR0(0)); + } - cdns_i3c_master_dev_rr_to_info(master, 0, &info); + cdns_i3c_master_i3c_dev_rr_to_info(master, 0, &info); if (info.bcr & I3C_BCR_HDR_CAP) info.hdr_cap = I3C_CCC_HDR_MODE(I3C_HDR_DDR); @@ -1289,6 +1365,23 @@ static int cdns_i3c_master_bus_init(struct i3c_master_controller *m) return 0; } +static +struct i3c_dev_desc *cdns_i3c_get_ibi_device(struct cdns_i3c_master *master, + u32 ibir) +{ + struct i3c_dev_desc *dev; + u32 id = IBIR_SLVID(ibir); + + if (id >= master->ibi.num_slots || (ibir & IBIR_ERROR)) + return NULL; + + dev = master->ibi.slots[id]; + if (!dev) + return NULL; + + return dev; +} + static void cdns_i3c_master_handle_ibi(struct cdns_i3c_master *master, u32 ibir) { @@ -1366,27 +1459,79 @@ static void cnds_i3c_master_demux_ibis(struct cdns_i3c_master *master) case IBIR_TYPE_MR: WARN_ON(IBIR_XFER_BYTES(ibir) || (ibir & IBIR_ERROR)); + master->mastership.ibir = ibir; + queue_work(master->base.wq, + &master->mastership.handover_work); + break; default: break; } } } +static void cdns_i3c_master_bus_handoff(struct cdns_i3c_master *master) +{ + struct i3c_dev_desc *dev; + + dev = cdns_i3c_get_ibi_device(master, master->mastership.ibir); + + writel(MST_INT_MR_DONE, master->regs + MST_ICR); + i3c_master_switch_operation_mode(&master->base, dev, I3C_SLAVE_MODE); +} + +static void cdns_i3c_sec_master_takeover(struct cdns_i3c_master *master) +{ + writel(SLV_INT_MR_DONE, master->regs + SLV_ICR); + i3c_master_switch_operation_mode(&master->base, + master->base.this, I3C_MASTER_MODE); +} + +static void cdns_i3c_sec_master_event_up(struct cdns_i3c_master *master) +{ + u32 status; + u8 evts = 0; + + writel(SLV_INT_EVENT_UP, master->regs + SLV_ICR); + status = readl(master->regs + SLV_STATUS1); + if (!(status & SLV_STATUS1_MR_DIS)) + evts |= I3C_CCC_EVENT_MR; + if (!(status & SLV_STATUS1_HJ_DIS)) + evts |= I3C_CCC_EVENT_HJ; + + i3c_secondary_master_events_enabled(&master->base, evts); +} + static irqreturn_t cdns_i3c_master_interrupt(int irq, void *data) { struct cdns_i3c_master *master = data; u32 status; - status = readl(master->regs + MST_ISR); - if (!(status & readl(master->regs + MST_IMR))) - return IRQ_NONE; + if (master->base.op_mode == I3C_SLAVE_MODE) { + status = readl(master->regs + SLV_ISR); - spin_lock(&master->xferqueue.lock); - cdns_i3c_master_end_xfer_locked(master, status); - spin_unlock(&master->xferqueue.lock); + if (!(status & readl(master->regs + SLV_IMR))) + return IRQ_NONE; - if (status & MST_INT_IBIR_THR) - cnds_i3c_master_demux_ibis(master); + if (status & SLV_INT_MR_DONE) + cdns_i3c_sec_master_takeover(master); + + if (status & SLV_INT_EVENT_UP) + cdns_i3c_sec_master_event_up(master); + } else { + status = readl(master->regs + MST_ISR); + if (!(status & readl(master->regs + MST_IMR))) + return IRQ_NONE; + + spin_lock(&master->xferqueue.lock); + cdns_i3c_master_end_xfer_locked(master, status); + spin_unlock(&master->xferqueue.lock); + + if (status & MST_INT_IBIR_THR) + cnds_i3c_master_demux_ibis(master); + + if (status & MST_INT_MR_DONE) + cdns_i3c_master_bus_handoff(master); + } return IRQ_HANDLED; } @@ -1455,30 +1600,46 @@ static int cdns_i3c_master_enable_ibi(struct i3c_dev_desc *dev) return ret; } -static int cdns_i3c_master_request_ibi(struct i3c_dev_desc *dev, - const struct i3c_ibi_setup *req) +static int cdns_i3c_master_find_ibi_slot(struct cdns_i3c_master *master, + struct i3c_dev_desc *dev, + s16 *slot) { - struct i3c_master_controller *m = i3c_dev_get_master(dev); - struct cdns_i3c_master *master = to_cdns_i3c_master(m); - struct cdns_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); unsigned long flags; unsigned int i; - - data->ibi_pool = i3c_generic_ibi_alloc_pool(dev, req); - if (IS_ERR(data->ibi_pool)) - return PTR_ERR(data->ibi_pool); + int ret = -ENOENT; spin_lock_irqsave(&master->ibi.lock, flags); for (i = 0; i < master->ibi.num_slots; i++) { - if (!master->ibi.slots[i]) { - data->ibi = i; + /* + * We only need 'SIR' slots to describe IBI-capable devices. + * This slot may be used by mastership request interrupt, + * We can ruse the same 'SIR' map entry. + */ + if (!master->ibi.slots[i] || + master->ibi.slots[i] == dev) { master->ibi.slots[i] = dev; + *slot = i; + ret = 0; break; } } spin_unlock_irqrestore(&master->ibi.lock, flags); - if (i < master->ibi.num_slots) + return ret; +} + +static int cdns_i3c_master_request_ibi(struct i3c_dev_desc *dev, + const struct i3c_ibi_setup *req) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct cdns_i3c_master *master = to_cdns_i3c_master(m); + struct cdns_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); + + data->ibi_pool = i3c_generic_ibi_alloc_pool(dev, req); + if (IS_ERR(data->ibi_pool)) + return PTR_ERR(data->ibi_pool); + + if (cdns_i3c_master_find_ibi_slot(master, dev, &data->ibi) == 0) return 0; i3c_generic_ibi_free_pool(data->ibi_pool); @@ -1487,6 +1648,37 @@ static int cdns_i3c_master_request_ibi(struct i3c_dev_desc *dev, return -ENOSPC; } +static int cdns_i3c_master_enable_mastership(struct i3c_dev_desc *dev) +{ + struct i3c_master_controller *m = i3c_dev_get_master(dev); + struct cdns_i3c_master *master = to_cdns_i3c_master(m); + struct cdns_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev); + unsigned long flags; + u32 sircfg, sirmap; + int ret; + + ret = cdns_i3c_master_find_ibi_slot(master, dev, &data->ibi); + if (ret) + return -ENOSPC; + + spin_lock_irqsave(&master->ibi.lock, flags); + sirmap = readl(master->regs + SIR_MAP_DEV_REG(data->ibi)); + sirmap &= ~SIR_MAP_DEV_CONF_MASK(data->ibi); + sircfg = SIR_MAP_DEV_ROLE(dev->info.bcr >> 6) | + SIR_MAP_DEV_DA(dev->info.dyn_addr) | + SIR_MAP_DEV_PL(dev->info.max_ibi_len) | + SIR_MAP_DEV_ACK; + + if (dev->info.bcr & I3C_BCR_MAX_DATA_SPEED_LIM) + sircfg |= SIR_MAP_DEV_SLOW; + + sirmap |= SIR_MAP_DEV_CONF(data->ibi, sircfg); + writel(sirmap, master->regs + SIR_MAP_DEV_REG(data->ibi)); + spin_unlock_irqrestore(&master->ibi.lock, flags); + + return 0; +} + static void cdns_i3c_master_free_ibi(struct i3c_dev_desc *dev) { struct i3c_master_controller *m = i3c_dev_get_master(dev); @@ -1529,6 +1721,9 @@ static const struct i3c_master_controller_ops cdns_i3c_master_ops = { .request_ibi = cdns_i3c_master_request_ibi, .free_ibi = cdns_i3c_master_free_ibi, .recycle_ibi_slot = cdns_i3c_master_recycle_ibi_slot, + .request_mastership = cdns_i3c_sec_master_request_mastership, + .update_devs = cdns_i3c_master_update_devs, + .enable_mastership = cdns_i3c_master_enable_mastership }; static void cdns_i3c_master_hj(struct work_struct *work) @@ -1537,13 +1732,31 @@ static void cdns_i3c_master_hj(struct work_struct *work) struct cdns_i3c_master, hj_work); - i3c_master_do_daa(&master->base); + if (!master->base.secondary) + i3c_master_do_daa(&master->base); +} + +static void cdns_i3c_master_mastership_handover(struct work_struct *work) +{ + struct cdns_i3c_master *master = container_of(work, + struct cdns_i3c_master, + mastership.handover_work); + struct i3c_dev_desc *dev; + u32 ibir = master->mastership.ibir; + + dev = cdns_i3c_get_ibi_device(master, ibir); + if (!dev) + return; + + if (i3c_master_mastership_ack(&master->base, &dev->info)) + dev_err(&master->base.dev, "Mastership handover failed\n"); } static int cdns_i3c_master_probe(struct platform_device *pdev) { struct cdns_i3c_master *master; struct resource *res; + bool secondary = false; int ret, irq; u32 val; @@ -1585,15 +1798,22 @@ static int cdns_i3c_master_probe(struct platform_device *pdev) INIT_LIST_HEAD(&master->xferqueue.list); INIT_WORK(&master->hj_work, cdns_i3c_master_hj); + INIT_WORK(&master->mastership.handover_work, + cdns_i3c_master_mastership_handover); writel(0xffffffff, master->regs + MST_IDR); writel(0xffffffff, master->regs + SLV_IDR); ret = devm_request_irq(&pdev->dev, irq, cdns_i3c_master_interrupt, 0, dev_name(&pdev->dev), master); + if (ret) goto err_disable_sysclk; platform_set_drvdata(pdev, master); + val = readl(master->regs + MST_STATUS0); + if (!(val & MST_STATUS0_MASTER_MODE)) + secondary = true; + val = readl(master->regs + CONF_STATUS0); /* Device ID0 is reserved to describe this master. */ @@ -1609,6 +1829,7 @@ static int cdns_i3c_master_probe(struct platform_device *pdev) spin_lock_init(&master->ibi.lock); master->ibi.num_slots = CONF_STATUS1_IBI_HW_RES(val); + master->ibi.slots = devm_kcalloc(&pdev->dev, master->ibi.num_slots, sizeof(*master->ibi.slots), GFP_KERNEL); @@ -1620,10 +1841,14 @@ static int cdns_i3c_master_probe(struct platform_device *pdev) writel(DEVS_CTRL_DEV_CLR_ALL, master->regs + DEVS_CTRL); ret = i3c_master_register(&master->base, &pdev->dev, - &cdns_i3c_master_ops, false); + &cdns_i3c_master_ops, secondary); if (ret) goto err_disable_sysclk; + if (secondary) + writel(SLV_INT_EVENT_UP, + master->regs + SLV_IER); + return 0; err_disable_sysclk: @@ -1666,6 +1891,7 @@ static struct platform_driver cdns_i3c_master = { module_platform_driver(cdns_i3c_master); MODULE_AUTHOR("Boris Brezillon "); +MODULE_AUTHOR("Przemyslaw Gaj "); MODULE_DESCRIPTION("Cadence I3C master driver"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:cdns-i3c-master"); -- 2.4.5 _______________________________________________ linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c