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Signed-off-by: Carlos Song --- drivers/i2c/busses/i2c-imx-lpi2c.c | 253 ++++++++++++++++++++++++++++- 1 file changed, 249 insertions(+), 4 deletions(-) diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c index 530ca5d76403..c8f3dadfb36e 100644 --- a/drivers/i2c/busses/i2c-imx-lpi2c.c +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c @@ -43,6 +43,20 @@ #define LPI2C_MTDR 0x60 /* i2c master TX data register */ #define LPI2C_MRDR 0x70 /* i2c master RX data register */ +#define LPI2C_SCR 0x110 /* i2c target contrl register */ +#define LPI2C_SSR 0x114 /* i2c target status register */ +#define LPI2C_SIER 0x118 /* i2c target interrupt enable */ +#define LPI2C_SDER 0x11C /* i2c target DMA enable */ +#define LPI2C_SCFGR0 0x120 /* i2c target configuration */ +#define LPI2C_SCFGR1 0x124 /* i2c target configuration */ +#define LPI2C_SCFGR2 0x128 /* i2c target configuration */ +#define LPI2C_SAMR 0x140 /* i2c target address match */ +#define LPI2C_SASR 0x150 /* i2c target address status */ +#define LPI2C_STAR 0x154 /* i2c target transmit ACK */ +#define LPI2C_STDR 0x160 /* i2c target transmit data */ +#define LPI2C_SRDR 0x170 /* i2c target receive data */ +#define LPI2C_SRDROR 0x178 /* i2c target receive data read only */ + /* i2c command */ #define TRAN_DATA 0X00 #define RECV_DATA 0X01 @@ -76,6 +90,42 @@ #define MDER_TDDE BIT(0) #define MDER_RDDE BIT(1) +#define SCR_SEN BIT(0) +#define SCR_RST BIT(1) +#define SCR_FILTEN BIT(4) +#define SCR_RTF BIT(8) +#define SCR_RRF BIT(9) +#define SCFGR1_RXSTALL BIT(1) +#define SCFGR1_TXDSTALL BIT(2) +#define SCFGR2_FILTSDA_SHIFT 24 +#define SCFGR2_FILTSCL_SHIFT 16 +#define SCFGR2_CLKHOLD(x) (x) +#define SCFGR2_FILTSDA(x) ((x) << SCFGR2_FILTSDA_SHIFT) +#define SCFGR2_FILTSCL(x) ((x) << SCFGR2_FILTSCL_SHIFT) +#define SSR_TDF BIT(0) +#define SSR_RDF BIT(1) +#define SSR_AVF BIT(2) +#define SSR_TAF BIT(3) +#define SSR_RSF BIT(8) +#define SSR_SDF BIT(9) +#define SSR_BEF BIT(10) +#define SSR_FEF BIT(11) +#define SSR_SBF BIT(24) +#define SSR_BBF BIT(25) +#define SSR_CLEAR_BITS (SSR_RSF | SSR_SDF | SSR_BEF | SSR_FEF) +#define SIER_TDIE BIT(0) +#define SIER_RDIE BIT(1) +#define SIER_AVIE BIT(2) +#define SIER_TAIE BIT(3) +#define SIER_RSIE BIT(8) +#define SIER_SDIE BIT(9) +#define SIER_BEIE BIT(10) +#define SIER_FEIE BIT(11) +#define SIER_AM0F BIT(12) +#define SASR_READ_REQ 0x1 +#define SLAVE_INT_FLAG (SIER_TDIE | SIER_RDIE | SIER_AVIE | \ + SIER_SDIE | SIER_BEIE) + #define I2C_CLK_RATIO 2 #define CHUNK_DATA 256 @@ -133,6 +183,7 @@ struct lpi2c_imx_struct { struct i2c_bus_recovery_info rinfo; bool can_use_dma; struct lpi2c_imx_dma *dma; + struct i2c_client *target; }; static void lpi2c_imx_intctrl(struct lpi2c_imx_struct *lpi2c_imx, @@ -952,9 +1003,57 @@ static int lpi2c_imx_xfer(struct i2c_adapter *adapter, return (result < 0) ? result : num; } -static irqreturn_t lpi2c_imx_isr(int irq, void *dev_id) +static irqreturn_t lpi2c_imx_target_isr(struct lpi2c_imx_struct *lpi2c_imx, + u32 ssr, u32 sier_filter) +{ + u8 value; + u32 sasr; + + /* Arbitration lost */ + if (sier_filter & SSR_BEF) { + writel(0, lpi2c_imx->base + LPI2C_SIER); + return IRQ_HANDLED; + } + + /* Address detected */ + if (sier_filter & SSR_AVF) { + sasr = readl(lpi2c_imx->base + LPI2C_SASR); + if (SASR_READ_REQ & sasr) { + /* Read request */ + i2c_slave_event(lpi2c_imx->target, I2C_SLAVE_READ_REQUESTED, &value); + writel(value, lpi2c_imx->base + LPI2C_STDR); + goto ret; + } else { + /* Write request */ + i2c_slave_event(lpi2c_imx->target, I2C_SLAVE_WRITE_REQUESTED, &value); + } + } + + if (sier_filter & SSR_SDF) { + /* STOP */ + i2c_slave_event(lpi2c_imx->target, I2C_SLAVE_STOP, &value); + } + + if (sier_filter & SSR_TDF) { + /* Target send data */ + i2c_slave_event(lpi2c_imx->target, I2C_SLAVE_READ_PROCESSED, &value); + writel(value, lpi2c_imx->base + LPI2C_STDR); + } + + if (sier_filter & SSR_RDF) { + /* Target receive data */ + value = readl(lpi2c_imx->base + LPI2C_SRDR); + i2c_slave_event(lpi2c_imx->target, I2C_SLAVE_WRITE_RECEIVED, &value); + } + +ret: + /* Clear SSR */ + writel(ssr & SSR_CLEAR_BITS, lpi2c_imx->base + LPI2C_SSR); + return IRQ_HANDLED; +} + +static irqreturn_t lpi2c_imx_master_isr(struct lpi2c_imx_struct *lpi2c_imx) { - struct lpi2c_imx_struct *lpi2c_imx = dev_id; unsigned int enabled; unsigned int temp; @@ -974,6 +1073,119 @@ static irqreturn_t lpi2c_imx_isr(int irq, void *dev_id) return IRQ_HANDLED; } +static irqreturn_t lpi2c_imx_isr(int irq, void *dev_id) +{ + struct lpi2c_imx_struct *lpi2c_imx = dev_id; + u32 ssr, sier_filter; + unsigned int scr; + + if (lpi2c_imx->target) { + scr = readl(lpi2c_imx->base + LPI2C_SCR); + ssr = readl(lpi2c_imx->base + LPI2C_SSR); + sier_filter = ssr & readl(lpi2c_imx->base + LPI2C_SIER); + if ((scr & SCR_SEN) && sier_filter) + return lpi2c_imx_target_isr(lpi2c_imx, ssr, sier_filter); + else + return lpi2c_imx_master_isr(lpi2c_imx); + } else { + return lpi2c_imx_master_isr(lpi2c_imx); + } +} + +static void lpi2c_imx_target_init(struct lpi2c_imx_struct *lpi2c_imx) +{ + int temp; + + /* reset target module */ + writel(SCR_RST, lpi2c_imx->base + LPI2C_SCR); + writel(0, lpi2c_imx->base + LPI2C_SCR); + + /* Set target addr */ + writel((lpi2c_imx->target->addr << 1), lpi2c_imx->base + LPI2C_SAMR); + + writel(SCFGR1_RXSTALL | SCFGR1_TXDSTALL, lpi2c_imx->base + LPI2C_SCFGR1); + + /* + * set SCFGR2: FILTSDA, FILTSCL and CLKHOLD + * + * FILTSCL/FILTSDA can eliminate signal skew. It should generally be + * set to the same value and should be set >= 50ns. + * + * CLKHOLD is only used when clock stretching is enabled, but it will + * extend the clock stretching to ensure there is an additional delay + * between the target driving SDA and the target releasing the SCL pin. + * + * CLKHOLD setting is crucial for lpi2c target. When master read data + * from target, if there is a delay caused by cpu idle, excessive load, + * or other delays between two bytes in one message transmission. so it + * will cause a short interval time between the driving SDA signal and + * releasing SCL signal. Lpi2c master will mistakenly think it is a stop + * signal resulting in an arbitration failure. This issue can be avoided + * by setting CLKHOLD. + * + * In order to ensure lpi2c function normally when the lpi2c speed is as + * low as 100kHz, CLKHOLD should be set 3 and it is also compatible with + * higher clock frequency like 400kHz and 1MHz. + */ + temp = SCFGR2_FILTSDA(2) | SCFGR2_FILTSCL(2) | SCFGR2_CLKHOLD(3); + writel(temp, lpi2c_imx->base + LPI2C_SCFGR2); + + /* + * Enable module: + * SCR_FILTEN can enable digital filter and output delay counter for LPI2C + * target mode. So SCR_FILTEN need be asserted when enable SDA/SCL FILTER + * and CLKHOLD. + */ + writel(SCR_SEN | SCR_FILTEN, lpi2c_imx->base + LPI2C_SCR); + + /* Enable interrupt from i2c module */ + writel(SLAVE_INT_FLAG, lpi2c_imx->base + LPI2C_SIER); +} + +static int lpi2c_imx_reg_target(struct i2c_client *client) +{ + struct lpi2c_imx_struct *lpi2c_imx = i2c_get_adapdata(client->adapter); + int ret; + + if (lpi2c_imx->target) + return -EBUSY; + + lpi2c_imx->target = client; + + ret = pm_runtime_resume_and_get(lpi2c_imx->adapter.dev.parent); + if (ret < 0) { + dev_err(&lpi2c_imx->adapter.dev, "failed to resume i2c controller"); + return ret; + } + + lpi2c_imx_target_init(lpi2c_imx); + + return 0; +} + +static int lpi2c_imx_unreg_target(struct i2c_client *client) +{ + struct lpi2c_imx_struct *lpi2c_imx = i2c_get_adapdata(client->adapter); + int ret; + + if (!lpi2c_imx->target) + return -EINVAL; + + /* Reset target address. */ + writel(0, lpi2c_imx->base + LPI2C_SAMR); + + writel(SCR_RST, lpi2c_imx->base + LPI2C_SCR); + writel(0, lpi2c_imx->base + LPI2C_SCR); + + lpi2c_imx->target = NULL; + + ret = pm_runtime_put_sync(lpi2c_imx->adapter.dev.parent); + if (ret < 0) + dev_err(&lpi2c_imx->adapter.dev, "failed to suspend i2c controller"); + + return ret; +} + static int lpi2c_imx_init_recovery_info(struct lpi2c_imx_struct *lpi2c_imx, struct platform_device *pdev) { @@ -1049,6 +1261,8 @@ static u32 lpi2c_imx_func(struct i2c_adapter *adapter) static const struct i2c_algorithm lpi2c_imx_algo = { .master_xfer = lpi2c_imx_xfer, .functionality = lpi2c_imx_func, + .reg_slave = lpi2c_imx_reg_target, + .unreg_slave = lpi2c_imx_unreg_target, }; static const struct of_device_id lpi2c_imx_of_match[] = { @@ -1199,9 +1413,40 @@ static int __maybe_unused lpi2c_runtime_resume(struct device *dev) return 0; } +static int lpi2c_suspend_noirq(struct device *dev) +{ + struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev); + int ret; + + ret = pm_runtime_force_suspend(dev); + if (ret) + return ret; + + return 0; +} + +static int lpi2c_resume_noirq(struct device *dev) +{ + struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev); + int ret; + + ret = pm_runtime_force_resume(dev); + if (ret) + return ret; + + /* + * If i2c module powered down in system suspend, register + * value will lose. So reinit target when system resume. + */ + if (lpi2c_imx->target) + lpi2c_imx_target_init(lpi2c_imx); + + return 0; +} + static const struct dev_pm_ops lpi2c_pm_ops = { - SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, - pm_runtime_force_resume) + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(lpi2c_suspend_noirq, + lpi2c_resume_noirq) SET_RUNTIME_PM_OPS(lpi2c_runtime_suspend, lpi2c_runtime_resume, NULL) }; From patchwork Thu Aug 29 09:37:19 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Carlos Song X-Patchwork-Id: 13782860 Received: from AM0PR83CU005.outbound.protection.outlook.com (mail-westeuropeazon11010049.outbound.protection.outlook.com [52.101.69.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 56D6818E04B for ; Thu, 29 Aug 2024 09:28:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.69.49 ARC-Seal: i=2; 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Some devices such as extend GPIO will need i2c transfer during the entire system suspend and resume period so keep it enabled. Signed-off-by: Carlos Song Signed-off-by: Frank Li --- drivers/i2c/busses/i2c-imx-lpi2c.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c index c8f3dadfb36e..23f83f10d5f6 100644 --- a/drivers/i2c/busses/i2c-imx-lpi2c.c +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c @@ -1309,7 +1309,7 @@ static int lpi2c_imx_probe(struct platform_device *pdev) if (ret) lpi2c_imx->bitrate = I2C_MAX_STANDARD_MODE_FREQ; - ret = devm_request_irq(&pdev->dev, irq, lpi2c_imx_isr, 0, + ret = devm_request_irq(&pdev->dev, irq, lpi2c_imx_isr, IRQF_NO_SUSPEND, pdev->name, lpi2c_imx); if (ret) return dev_err_probe(&pdev->dev, ret, "can't claim irq %d\n", irq); From patchwork Thu Aug 29 09:37:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Carlos Song X-Patchwork-Id: 13782861 Received: from AM0PR83CU005.outbound.protection.outlook.com (mail-westeuropeazon11010049.outbound.protection.outlook.com [52.101.69.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 628D718DF79 for ; 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No visible impact if the parent controller is the GIC, but it has significant power savings for parent IRQ controllers like IRQSteer inside a subsystem on i.MX8 SoCs. Releasing the parent IRQ provides an opportunity for the subsystem to enter suspend states if there are no active users. Signed-off-by: Carlos Song Signed-off-by: Frank Li --- drivers/i2c/busses/i2c-imx-lpi2c.c | 40 ++++++++++++++++++++++++------ 1 file changed, 33 insertions(+), 7 deletions(-) diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c index 23f83f10d5f6..0159ade235ef 100644 --- a/drivers/i2c/busses/i2c-imx-lpi2c.c +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c @@ -168,6 +168,7 @@ struct lpi2c_imx_struct { struct i2c_adapter adapter; int num_clks; struct clk_bulk_data *clks; + int irq; void __iomem *base; __u8 *rx_buf; __u8 *tx_buf; @@ -1252,6 +1253,27 @@ static int lpi2c_dma_init(struct device *dev, dma_addr_t phy_addr) return ret; } +static int lpi2c_manage_irq_handler(struct lpi2c_imx_struct *lpi2c_imx, bool enable) +{ + int ret; + + if (enable) { + ret = devm_request_irq(lpi2c_imx->adapter.dev.parent, lpi2c_imx->irq, + lpi2c_imx_isr, IRQF_NO_SUSPEND, + dev_name(lpi2c_imx->adapter.dev.parent), + lpi2c_imx); + if (ret) { + dev_err(lpi2c_imx->adapter.dev.parent, "can't claim irq %d\n", + lpi2c_imx->irq); + return ret; + } + } else { + devm_free_irq(lpi2c_imx->adapter.dev.parent, lpi2c_imx->irq, lpi2c_imx); + } + + return 0; +} + static u32 lpi2c_imx_func(struct i2c_adapter *adapter) { return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | @@ -1277,7 +1299,7 @@ static int lpi2c_imx_probe(struct platform_device *pdev) struct resource *res; dma_addr_t phy_addr; unsigned int temp; - int irq, ret; + int ret; lpi2c_imx = devm_kzalloc(&pdev->dev, sizeof(*lpi2c_imx), GFP_KERNEL); if (!lpi2c_imx) @@ -1287,9 +1309,9 @@ static int lpi2c_imx_probe(struct platform_device *pdev) if (IS_ERR(lpi2c_imx->base)) return PTR_ERR(lpi2c_imx->base); - irq = platform_get_irq(pdev, 0); - if (irq < 0) - return irq; + lpi2c_imx->irq = platform_get_irq(pdev, 0); + if (lpi2c_imx->irq < 0) + return lpi2c_imx->irq; lpi2c_imx->adapter.owner = THIS_MODULE; lpi2c_imx->adapter.algo = &lpi2c_imx_algo; @@ -1309,10 +1331,9 @@ static int lpi2c_imx_probe(struct platform_device *pdev) if (ret) lpi2c_imx->bitrate = I2C_MAX_STANDARD_MODE_FREQ; - ret = devm_request_irq(&pdev->dev, irq, lpi2c_imx_isr, IRQF_NO_SUSPEND, - pdev->name, lpi2c_imx); + ret = lpi2c_manage_irq_handler(lpi2c_imx, true); if (ret) - return dev_err_probe(&pdev->dev, ret, "can't claim irq %d\n", irq); + return ret; i2c_set_adapdata(&lpi2c_imx->adapter, lpi2c_imx); platform_set_drvdata(pdev, lpi2c_imx); @@ -1392,6 +1413,7 @@ static int __maybe_unused lpi2c_runtime_suspend(struct device *dev) { struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev); + lpi2c_manage_irq_handler(lpi2c_imx, false); clk_bulk_disable(lpi2c_imx->num_clks, lpi2c_imx->clks); pinctrl_pm_select_sleep_state(dev); @@ -1410,6 +1432,10 @@ static int __maybe_unused lpi2c_runtime_resume(struct device *dev) return ret; } + ret = lpi2c_manage_irq_handler(lpi2c_imx, true); + if (ret) + return ret; + return 0; } From patchwork Thu Aug 29 09:37:21 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Carlos Song X-Patchwork-Id: 13782862 Received: from AM0PR83CU005.outbound.protection.outlook.com (mail-westeuropeazon11010049.outbound.protection.outlook.com [52.101.69.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A260718DF79 for ; 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Use subsys_initcall to improve i2c driver probe priority. Signed-off-by: Carlos Song Signed-off-by: Frank Li --- drivers/i2c/busses/i2c-imx-lpi2c.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c index 0159ade235ef..210d505db76d 100644 --- a/drivers/i2c/busses/i2c-imx-lpi2c.c +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c @@ -1487,7 +1487,17 @@ static struct platform_driver lpi2c_imx_driver = { }, }; -module_platform_driver(lpi2c_imx_driver); +static int __init lpi2c_imx_init(void) +{ + return platform_driver_register(&lpi2c_imx_driver); +} +subsys_initcall(lpi2c_imx_init); + +static void __exit lpi2c_imx_exit(void) +{ + platform_driver_unregister(&lpi2c_imx_driver); +} +module_exit(lpi2c_imx_exit); MODULE_AUTHOR("Gao Pan "); MODULE_DESCRIPTION("I2C adapter driver for LPI2C bus"); From patchwork Thu Aug 29 09:37:22 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Carlos Song X-Patchwork-Id: 13782863 Received: from AM0PR83CU005.outbound.protection.outlook.com (mail-westeuropeazon11010036.outbound.protection.outlook.com [52.101.69.36]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2175918FDBA for ; 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Signed-off-by: Clark Wang Signed-off-by: Carlos Song --- drivers/i2c/busses/i2c-imx-lpi2c.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c index 210d505db76d..cc5e5d96aacd 100644 --- a/drivers/i2c/busses/i2c-imx-lpi2c.c +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c @@ -129,7 +129,7 @@ #define I2C_CLK_RATIO 2 #define CHUNK_DATA 256 -#define I2C_PM_TIMEOUT 10 /* ms */ +#define I2C_PM_TIMEOUT 1000 /* ms */ #define I2C_DMA_THRESHOLD 8 /* bytes */ enum lpi2c_imx_mode {