diff options
Diffstat (limited to 'drivers/tty/serial/fsl_lpuart.c')
| -rw-r--r-- | drivers/tty/serial/fsl_lpuart.c | 114 |
1 files changed, 89 insertions, 25 deletions
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index ea1c85e3b432..92dad2b4ec36 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -234,9 +234,18 @@ static DEFINE_IDA(fsl_lpuart_ida); +enum lpuart_type { + VF610_LPUART, + LS1021A_LPUART, + IMX7ULP_LPUART, + IMX8QXP_LPUART, +}; + struct lpuart_port { struct uart_port port; - struct clk *clk; + enum lpuart_type devtype; + struct clk *ipg_clk; + struct clk *baud_clk; unsigned int txfifo_size; unsigned int rxfifo_size; @@ -261,19 +270,29 @@ struct lpuart_port { }; struct lpuart_soc_data { - char iotype; - u8 reg_off; + enum lpuart_type devtype; + char iotype; + u8 reg_off; }; static const struct lpuart_soc_data vf_data = { + .devtype = VF610_LPUART, .iotype = UPIO_MEM, }; static const struct lpuart_soc_data ls_data = { + .devtype = LS1021A_LPUART, .iotype = UPIO_MEM32BE, }; -static struct lpuart_soc_data imx_data = { +static struct lpuart_soc_data imx7ulp_data = { + .devtype = IMX7ULP_LPUART, + .iotype = UPIO_MEM32, + .reg_off = IMX_REG_OFF, +}; + +static struct lpuart_soc_data imx8qxp_data = { + .devtype = IMX8QXP_LPUART, .iotype = UPIO_MEM32, .reg_off = IMX_REG_OFF, }; @@ -281,7 +300,8 @@ static struct lpuart_soc_data imx_data = { static const struct of_device_id lpuart_dt_ids[] = { { .compatible = "fsl,vf610-lpuart", .data = &vf_data, }, { .compatible = "fsl,ls1021a-lpuart", .data = &ls_data, }, - { .compatible = "fsl,imx7ulp-lpuart", .data = &imx_data, }, + { .compatible = "fsl,imx7ulp-lpuart", .data = &imx7ulp_data, }, + { .compatible = "fsl,imx8qxp-lpuart", .data = &imx8qxp_data, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, lpuart_dt_ids); @@ -289,6 +309,11 @@ MODULE_DEVICE_TABLE(of, lpuart_dt_ids); /* Forward declare this for the dma callbacks*/ static void lpuart_dma_tx_complete(void *arg); +static inline bool is_imx8qxp_lpuart(struct lpuart_port *sport) +{ + return sport->devtype == IMX8QXP_LPUART; +} + static inline u32 lpuart32_read(struct uart_port *port, u32 off) { switch (port->iotype) { @@ -314,6 +339,39 @@ static inline void lpuart32_write(struct uart_port *port, u32 val, } } +static int __lpuart_enable_clks(struct lpuart_port *sport, bool is_en) +{ + int ret = 0; + + if (is_en) { + ret = clk_prepare_enable(sport->ipg_clk); + if (ret) + return ret; + + ret = clk_prepare_enable(sport->baud_clk); + if (ret) { + clk_disable_unprepare(sport->ipg_clk); + return ret; + } + } else { + clk_disable_unprepare(sport->baud_clk); + clk_disable_unprepare(sport->ipg_clk); + } + + return 0; +} + +static unsigned int lpuart_get_baud_clk_rate(struct lpuart_port *sport) +{ + if (is_imx8qxp_lpuart(sport)) + return clk_get_rate(sport->baud_clk); + + return clk_get_rate(sport->ipg_clk); +} + +#define lpuart_enable_clks(x) __lpuart_enable_clks(x, true) +#define lpuart_disable_clks(x) __lpuart_enable_clks(x, false) + static void lpuart_stop_tx(struct uart_port *port) { unsigned char temp; @@ -1040,10 +1098,8 @@ static inline int lpuart_start_rx_dma(struct lpuart_port *sport) sport->rx_dma_rng_buf_len = 16; ring->buf = kmalloc(sport->rx_dma_rng_buf_len, GFP_ATOMIC); - if (!ring->buf) { - dev_err(sport->port.dev, "Ring buf alloc failed\n"); + if (!ring->buf) return -ENOMEM; - } sg_init_one(&sport->rx_sgl, ring->buf, sport->rx_dma_rng_buf_len); sg_set_buf(&sport->rx_sgl, ring->buf, sport->rx_dma_rng_buf_len); @@ -2071,14 +2127,14 @@ lpuart_console_get_options(struct lpuart_port *sport, int *baud, brfa = readb(sport->port.membase + UARTCR4); brfa &= UARTCR4_BRFA_MASK; - uartclk = clk_get_rate(sport->clk); + uartclk = lpuart_get_baud_clk_rate(sport); /* * baud = mod_clk/(16*(sbr[13]+(brfa)/32) */ baud_raw = uartclk / (16 * (sbr + brfa / 32)); if (*baud != baud_raw) - printk(KERN_INFO "Serial: Console lpuart rounded baud rate" + dev_info(sport->port.dev, "Serial: Console lpuart rounded baud rate" "from %d to %d\n", baud_raw, *baud); } @@ -2114,14 +2170,14 @@ lpuart32_console_get_options(struct lpuart_port *sport, int *baud, bd = lpuart32_read(&sport->port, UARTBAUD); bd &= UARTBAUD_SBR_MASK; sbr = bd; - uartclk = clk_get_rate(sport->clk); + uartclk = lpuart_get_baud_clk_rate(sport); /* * baud = mod_clk/(16*(sbr[13]+(brfa)/32) */ baud_raw = uartclk / (16 * sbr); if (*baud != baud_raw) - printk(KERN_INFO "Serial: Console lpuart rounded baud rate" + dev_info(sport->port.dev, "Serial: Console lpuart rounded baud rate" "from %d to %d\n", baud_raw, *baud); } @@ -2288,6 +2344,7 @@ static int lpuart_probe(struct platform_device *pdev) sport->port.mapbase = res->start; sport->port.dev = &pdev->dev; sport->port.type = PORT_LPUART; + sport->devtype = sdata->devtype; ret = platform_get_irq(pdev, 0); if (ret < 0) { dev_err(&pdev->dev, "cannot obtain irq\n"); @@ -2303,20 +2360,27 @@ static int lpuart_probe(struct platform_device *pdev) sport->port.rs485_config = lpuart_config_rs485; - sport->clk = devm_clk_get(&pdev->dev, "ipg"); - if (IS_ERR(sport->clk)) { - ret = PTR_ERR(sport->clk); - dev_err(&pdev->dev, "failed to get uart clk: %d\n", ret); + sport->ipg_clk = devm_clk_get(&pdev->dev, "ipg"); + if (IS_ERR(sport->ipg_clk)) { + ret = PTR_ERR(sport->ipg_clk); + dev_err(&pdev->dev, "failed to get uart ipg clk: %d\n", ret); return ret; } - ret = clk_prepare_enable(sport->clk); - if (ret) { - dev_err(&pdev->dev, "failed to enable uart clk: %d\n", ret); - return ret; + sport->baud_clk = NULL; + if (is_imx8qxp_lpuart(sport)) { + sport->baud_clk = devm_clk_get(&pdev->dev, "baud"); + if (IS_ERR(sport->baud_clk)) { + ret = PTR_ERR(sport->baud_clk); + dev_err(&pdev->dev, "failed to get uart baud clk: %d\n", ret); + return ret; + } } - sport->port.uartclk = clk_get_rate(sport->clk); + ret = lpuart_enable_clks(sport); + if (ret) + return ret; + sport->port.uartclk = lpuart_get_baud_clk_rate(sport); lpuart_ports[sport->port.line] = sport; @@ -2364,7 +2428,7 @@ static int lpuart_probe(struct platform_device *pdev) failed_attach_port: failed_irq_request: - clk_disable_unprepare(sport->clk); + lpuart_disable_clks(sport); return ret; } @@ -2376,7 +2440,7 @@ static int lpuart_remove(struct platform_device *pdev) ida_simple_remove(&fsl_lpuart_ida, sport->port.line); - clk_disable_unprepare(sport->clk); + lpuart_disable_clks(sport); if (sport->dma_tx_chan) dma_release_channel(sport->dma_tx_chan); @@ -2441,7 +2505,7 @@ static int lpuart_suspend(struct device *dev) } if (sport->port.suspended && !irq_wake) - clk_disable_unprepare(sport->clk); + lpuart_disable_clks(sport); return 0; } @@ -2453,7 +2517,7 @@ static int lpuart_resume(struct device *dev) unsigned long temp; if (sport->port.suspended && !irq_wake) - clk_prepare_enable(sport->clk); + lpuart_enable_clks(sport); if (lpuart_is_32(sport)) { lpuart32_setup_watermark(sport); |