diff --git a/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml b/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml index 4fbdcda..853092f 100644 --- a/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml +++ b/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml @@ -9,14 +9,17 @@ title: Silvaco I3C master maintainers: - Conor Culhane -allOf: - - $ref: i3c.yaml# - properties: compatible: - enum: - - nuvoton,npcm845-i3c - - silvaco,i3c-master-v1 + oneOf: + - enum: + - nuvoton,npcm845-i3c + - silvaco,i3c-master-v1 + - items: + - enum: + - nxp,imx94-i3c + - nxp,imx95-i3c + - const: silvaco,i3c-master-v1 reg: maxItems: 1 @@ -25,12 +28,14 @@ properties: maxItems: 1 clocks: + minItems: 2 items: - description: system clock - description: bus clock - description: other (slower) events clock clock-names: + minItems: 2 items: - const: pclk - const: fast_clk @@ -46,6 +51,34 @@ required: - clock-names - clocks +allOf: + - $ref: i3c.yaml# + - if: + properties: + compatible: + enum: + - nuvoton,npcm845-i3c + - silvaco,i3c-master-v1 + then: + properties: + clocks: + minItems: 3 + clock-names: + minItems: 3 + - if: + properties: + compatible: + contains: + enum: + - nxp,imx94-i3c + - nxp,imx95-i3c + then: + properties: + clocks: + maxItems: 2 + clock-names: + maxItems: 2 + unevaluatedProperties: false examples: diff --git a/drivers/i3c/master/Kconfig b/drivers/i3c/master/Kconfig index 77da199..7b30db3 100644 --- a/drivers/i3c/master/Kconfig +++ b/drivers/i3c/master/Kconfig @@ -1,7 +1,6 @@ # SPDX-License-Identifier: GPL-2.0-only config CDNS_I3C_MASTER tristate "Cadence I3C master driver" - depends on I3C depends on HAS_IOMEM depends on !(ALPHA || PARISC) help @@ -9,7 +8,6 @@ config CDNS_I3C_MASTER config DW_I3C_MASTER tristate "Synospsys DesignWare I3C master driver" - depends on I3C depends on HAS_IOMEM depends on !(ALPHA || PARISC) # ALPHA and PARISC needs {read,write}sl() @@ -38,7 +36,6 @@ config AST2600_I3C_MASTER config SVC_I3C_MASTER tristate "Silvaco I3C Dual-Role Master driver" - depends on I3C depends on HAS_IOMEM depends on !(ALPHA || PARISC) help @@ -46,7 +43,6 @@ config SVC_I3C_MASTER config MIPI_I3C_HCI tristate "MIPI I3C Host Controller Interface driver (EXPERIMENTAL)" - depends on I3C depends on HAS_IOMEM help Support for hardware following the MIPI Aliance's I3C Host Controller diff --git a/drivers/i3c/master/mipi-i3c-hci/core.c b/drivers/i3c/master/mipi-i3c-hci/core.c index a71226d..bc45386 100644 --- a/drivers/i3c/master/mipi-i3c-hci/core.c +++ b/drivers/i3c/master/mipi-i3c-hci/core.c @@ -78,7 +78,7 @@ #define INTR_SIGNAL_ENABLE 0x28 #define INTR_FORCE 0x2c #define INTR_HC_CMD_SEQ_UFLOW_STAT BIT(12) /* Cmd Sequence Underflow */ -#define INTR_HC_RESET_CANCEL BIT(11) /* HC Cancelled Reset */ +#define INTR_HC_SEQ_CANCEL BIT(11) /* HC Cancelled Transaction Sequence */ #define INTR_HC_INTERNAL_ERR BIT(10) /* HC Internal Error */ #define DAT_SECTION 0x30 /* Device Address Table */ @@ -590,26 +590,27 @@ static irqreturn_t i3c_hci_irq_handler(int irq, void *dev_id) u32 val; val = reg_read(INTR_STATUS); + reg_write(INTR_STATUS, val); DBG("INTR_STATUS = %#x", val); - if (val) { - reg_write(INTR_STATUS, val); - } + if (val) + result = IRQ_HANDLED; - if (val & INTR_HC_RESET_CANCEL) { - DBG("cancelled reset"); - val &= ~INTR_HC_RESET_CANCEL; + if (val & INTR_HC_SEQ_CANCEL) { + dev_dbg(&hci->master.dev, + "Host Controller Cancelled Transaction Sequence\n"); + val &= ~INTR_HC_SEQ_CANCEL; } if (val & INTR_HC_INTERNAL_ERR) { dev_err(&hci->master.dev, "Host Controller Internal Error\n"); val &= ~INTR_HC_INTERNAL_ERR; } - hci->io->irq_handler(hci); - if (val) - dev_err(&hci->master.dev, "unexpected INTR_STATUS %#x\n", val); - else + dev_warn_once(&hci->master.dev, + "unexpected INTR_STATUS %#x\n", val); + + if (hci->io->irq_handler(hci)) result = IRQ_HANDLED; return result; @@ -699,9 +700,14 @@ static int i3c_hci_init(struct i3c_hci *hci) if (ret) return -ENXIO; - /* Disable all interrupts and allow all signal updates */ + /* Disable all interrupts */ reg_write(INTR_SIGNAL_ENABLE, 0x0); - reg_write(INTR_STATUS_ENABLE, 0xffffffff); + /* + * Only allow bit 31:10 signal updates because + * Bit 0:9 are reserved in IP version >= 0.8 + * Bit 0:5 are defined in IP version < 0.8 but not handled by PIO code + */ + reg_write(INTR_STATUS_ENABLE, GENMASK(31, 10)); /* Make sure our data ordering fits the host's */ regval = reg_read(HC_CONTROL); diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c index 85e16de..7e1a7cb 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -201,11 +201,10 @@ struct svc_i3c_drvdata { * @addrs: Array containing the dynamic addresses of each attached device * @descs: Array of descriptors, one per attached device * @hj_work: Hot-join work - * @ibi_work: IBI work * @irq: Main interrupt - * @pclk: System clock + * @num_clks: I3C clock number * @fclk: Fast clock (bus) - * @sclk: Slow clock (other events) + * @clks: I3C clock array * @xferqueue: Transfer queue structure * @xferqueue.list: List member * @xferqueue.cur: Current ongoing transfer @@ -229,11 +228,10 @@ struct svc_i3c_master { u8 addrs[SVC_I3C_MAX_DEVS]; struct i3c_dev_desc *descs[SVC_I3C_MAX_DEVS]; struct work_struct hj_work; - struct work_struct ibi_work; int irq; - struct clk *pclk; + int num_clks; struct clk *fclk; - struct clk *sclk; + struct clk_bulk_data *clks; struct { struct list_head list; struct svc_i3c_xfer *cur; @@ -487,9 +485,8 @@ static int svc_i3c_master_handle_ibi_won(struct svc_i3c_master *master, u32 msta return ret; } -static void svc_i3c_master_ibi_work(struct work_struct *work) +static void svc_i3c_master_ibi_isr(struct svc_i3c_master *master) { - struct svc_i3c_master *master = container_of(work, struct svc_i3c_master, ibi_work); struct svc_i3c_i2c_dev_data *data; unsigned int ibitype, ibiaddr; struct i3c_dev_desc *dev; @@ -504,7 +501,7 @@ static void svc_i3c_master_ibi_work(struct work_struct *work) * schedule during the whole I3C transaction, otherwise, the I3C bus timeout may happen if * any irq or schedule happen during transaction. */ - guard(spinlock_irqsave)(&master->xferqueue.lock); + guard(spinlock)(&master->xferqueue.lock); /* * IBIWON may be set before SVC_I3C_MCTRL_REQUEST_AUTO_IBI, causing @@ -530,7 +527,7 @@ static void svc_i3c_master_ibi_work(struct work_struct *work) if (ret) { dev_err(master->dev, "Timeout when polling for IBIWON\n"); svc_i3c_master_emit_stop(master); - goto reenable_ibis; + return; } status = readl(master->regs + SVC_I3C_MSTATUS); @@ -574,17 +571,17 @@ static void svc_i3c_master_ibi_work(struct work_struct *work) svc_i3c_master_emit_stop(master); - goto reenable_ibis; + return; } /* Handle the non critical tasks */ switch (ibitype) { case SVC_I3C_MSTATUS_IBITYPE_IBI: + svc_i3c_master_emit_stop(master); if (dev) { i3c_master_queue_ibi(dev, master->ibi.tbq_slot); master->ibi.tbq_slot = NULL; } - svc_i3c_master_emit_stop(master); break; case SVC_I3C_MSTATUS_IBITYPE_HOT_JOIN: svc_i3c_master_emit_stop(master); @@ -597,9 +594,6 @@ static void svc_i3c_master_ibi_work(struct work_struct *work) default: break; } - -reenable_ibis: - svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART); } static irqreturn_t svc_i3c_master_irq_handler(int irq, void *dev_id) @@ -618,10 +612,12 @@ static irqreturn_t svc_i3c_master_irq_handler(int irq, void *dev_id) !SVC_I3C_MSTATUS_STATE_SLVREQ(active)) return IRQ_HANDLED; - svc_i3c_master_disable_interrupts(master); - - /* Handle the interrupt in a non atomic context */ - queue_work(master->base.wq, &master->ibi_work); + /* + * The SDA line remains low until the request is processed. + * Receive the request in the interrupt context to respond promptly + * and restore the bus to idle state. + */ + svc_i3c_master_ibi_isr(master); return IRQ_HANDLED; } @@ -1281,9 +1277,9 @@ static int svc_i3c_master_write(struct svc_i3c_master *master, static int svc_i3c_master_xfer(struct svc_i3c_master *master, bool rnw, unsigned int xfer_type, u8 addr, u8 *in, const u8 *out, unsigned int xfer_len, - unsigned int *actual_len, bool continued) + unsigned int *actual_len, bool continued, bool repeat_start) { - int retry = 2; + int retry = repeat_start ? 1 : 2; u32 reg; int ret; @@ -1468,7 +1464,7 @@ static void svc_i3c_master_start_xfer_locked(struct svc_i3c_master *master) ret = svc_i3c_master_xfer(master, cmd->rnw, xfer->type, cmd->addr, cmd->in, cmd->out, cmd->len, &cmd->actual_len, - cmd->continued); + cmd->continued, i > 0); /* cmd->xfer is NULL if I2C or CCC transfer */ if (cmd->xfer) cmd->xfer->actual_len = cmd->actual_len; @@ -1875,42 +1871,11 @@ static const struct i3c_master_controller_ops svc_i3c_master_ops = { .set_speed = svc_i3c_master_set_speed, }; -static int svc_i3c_master_prepare_clks(struct svc_i3c_master *master) -{ - int ret = 0; - - ret = clk_prepare_enable(master->pclk); - if (ret) - return ret; - - ret = clk_prepare_enable(master->fclk); - if (ret) { - clk_disable_unprepare(master->pclk); - return ret; - } - - ret = clk_prepare_enable(master->sclk); - if (ret) { - clk_disable_unprepare(master->pclk); - clk_disable_unprepare(master->fclk); - return ret; - } - - return 0; -} - -static void svc_i3c_master_unprepare_clks(struct svc_i3c_master *master) -{ - clk_disable_unprepare(master->pclk); - clk_disable_unprepare(master->fclk); - clk_disable_unprepare(master->sclk); -} - static int svc_i3c_master_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct svc_i3c_master *master; - int ret; + int ret, i; master = devm_kzalloc(dev, sizeof(*master), GFP_KERNEL); if (!master) @@ -1924,30 +1889,33 @@ static int svc_i3c_master_probe(struct platform_device *pdev) if (IS_ERR(master->regs)) return PTR_ERR(master->regs); - master->pclk = devm_clk_get(dev, "pclk"); - if (IS_ERR(master->pclk)) - return PTR_ERR(master->pclk); + master->num_clks = devm_clk_bulk_get_all(dev, &master->clks); + if (master->num_clks < 0) + return dev_err_probe(dev, -EINVAL, "can't get I3C clocks\n"); - master->fclk = devm_clk_get(dev, "fast_clk"); + for (i = 0; i < master->num_clks; i++) { + if (!strcmp(master->clks[i].id, "fast_clk")) + break; + } + + if (i == master->num_clks) + return dev_err_probe(dev, -EINVAL, + "can't get I3C peripheral clock\n"); + + master->fclk = master->clks[i].clk; if (IS_ERR(master->fclk)) return PTR_ERR(master->fclk); - master->sclk = devm_clk_get(dev, "slow_clk"); - if (IS_ERR(master->sclk)) - return PTR_ERR(master->sclk); - master->irq = platform_get_irq(pdev, 0); if (master->irq < 0) return master->irq; master->dev = dev; - - ret = svc_i3c_master_prepare_clks(master); + ret = clk_bulk_prepare_enable(master->num_clks, master->clks); if (ret) - return ret; + return dev_err_probe(dev, ret, "can't enable I3C clocks\n"); INIT_WORK(&master->hj_work, svc_i3c_master_hj_work); - INIT_WORK(&master->ibi_work, svc_i3c_master_ibi_work); mutex_init(&master->lock); ret = devm_request_irq(dev, master->irq, svc_i3c_master_irq_handler, @@ -1998,7 +1966,7 @@ rpm_disable: pm_runtime_set_suspended(&pdev->dev); err_disable_clks: - svc_i3c_master_unprepare_clks(master); + clk_bulk_disable_unprepare(master->num_clks, master->clks); return ret; } @@ -2036,7 +2004,7 @@ static int __maybe_unused svc_i3c_runtime_suspend(struct device *dev) struct svc_i3c_master *master = dev_get_drvdata(dev); svc_i3c_save_regs(master); - svc_i3c_master_unprepare_clks(master); + clk_bulk_disable_unprepare(master->num_clks, master->clks); pinctrl_pm_select_sleep_state(dev); return 0; @@ -2045,9 +2013,12 @@ static int __maybe_unused svc_i3c_runtime_suspend(struct device *dev) static int __maybe_unused svc_i3c_runtime_resume(struct device *dev) { struct svc_i3c_master *master = dev_get_drvdata(dev); + int ret; pinctrl_pm_select_default_state(dev); - svc_i3c_master_prepare_clks(master); + ret = clk_bulk_prepare_enable(master->num_clks, master->clks); + if (ret) + return ret; svc_i3c_restore_regs(master);