diff options
Diffstat (limited to 'drivers/tty/serial/8250')
| -rw-r--r-- | drivers/tty/serial/8250/8250_early.c | 3 | ||||
| -rw-r--r-- | drivers/tty/serial/8250/8250_mtk.c | 13 | ||||
| -rw-r--r-- | drivers/tty/serial/8250/8250_omap.c | 48 | ||||
| -rw-r--r-- | drivers/tty/serial/8250/8250_pci.c | 2 | ||||
| -rw-r--r-- | drivers/tty/serial/8250/serial_cs.c | 9 |
5 files changed, 56 insertions, 19 deletions
diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c index 70d7826788f5..c171ce6db691 100644 --- a/drivers/tty/serial/8250/8250_early.c +++ b/drivers/tty/serial/8250/8250_early.c @@ -204,9 +204,6 @@ OF_EARLYCON_DECLARE(omap8250, "ti,omap4-uart", early_omap8250_setup); #ifdef CONFIG_SERIAL_8250_RT288X -unsigned int au_serial_in(struct uart_port *p, int offset); -void au_serial_out(struct uart_port *p, int offset, int value); - static int __init early_au_setup(struct earlycon_device *dev, const char *opt) { dev->port.serial_in = au_serial_in; diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c index fa876e2c13e5..f7d3023f860f 100644 --- a/drivers/tty/serial/8250/8250_mtk.c +++ b/drivers/tty/serial/8250/8250_mtk.c @@ -572,15 +572,22 @@ static int mtk8250_probe(struct platform_device *pdev) pm_runtime_enable(&pdev->dev); err = mtk8250_runtime_resume(&pdev->dev); if (err) - return err; + goto err_pm_disable; data->line = serial8250_register_8250_port(&uart); - if (data->line < 0) - return data->line; + if (data->line < 0) { + err = data->line; + goto err_pm_disable; + } data->rx_wakeup_irq = platform_get_irq_optional(pdev, 1); return 0; + +err_pm_disable: + pm_runtime_disable(&pdev->dev); + + return err; } static int mtk8250_remove(struct platform_device *pdev) diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c index 562087df7d33..23e0decde33e 100644 --- a/drivers/tty/serial/8250/8250_omap.c +++ b/drivers/tty/serial/8250/8250_omap.c @@ -27,6 +27,7 @@ #include <linux/pm_qos.h> #include <linux/pm_wakeirq.h> #include <linux/dma-mapping.h> +#include <linux/sys_soc.h> #include "8250.h" @@ -41,6 +42,7 @@ */ #define UART_ERRATA_CLOCK_DISABLE (1 << 3) #define UART_HAS_EFR2 BIT(4) +#define UART_HAS_RHR_IT_DIS BIT(5) #define OMAP_UART_FCR_RX_TRIG 6 #define OMAP_UART_FCR_TX_TRIG 4 @@ -94,6 +96,10 @@ #define OMAP_UART_REV_52 0x0502 #define OMAP_UART_REV_63 0x0603 +/* Interrupt Enable Register 2 */ +#define UART_OMAP_IER2 0x1B +#define UART_OMAP_IER2_RHR_IT_DIS BIT(2) + /* Enhanced features register 2 */ #define UART_OMAP_EFR2 0x23 #define UART_OMAP_EFR2_TIMEOUT_BEHAVE BIT(6) @@ -184,11 +190,6 @@ static void omap_8250_mdr1_errataset(struct uart_8250_port *up, struct omap8250_priv *priv) { u8 timeout = 255; - u8 old_mdr1; - - old_mdr1 = serial_in(up, UART_OMAP_MDR1); - if (old_mdr1 == priv->mdr1) - return; serial_out(up, UART_OMAP_MDR1, priv->mdr1); udelay(2); @@ -533,6 +534,11 @@ static void omap_8250_pm(struct uart_port *port, unsigned int state, static void omap_serial_fill_features_erratas(struct uart_8250_port *up, struct omap8250_priv *priv) { + const struct soc_device_attribute k3_soc_devices[] = { + { .family = "AM65X", }, + { .family = "J721E", .revision = "SR1.0" }, + { /* sentinel */ } + }; u32 mvr, scheme; u16 revision, major, minor; @@ -580,6 +586,14 @@ static void omap_serial_fill_features_erratas(struct uart_8250_port *up, default: break; } + + /* + * AM65x SR1.0, AM65x SR2.0 and J721e SR1.0 don't + * don't have RHR_IT_DIS bit in IER2 register. So drop to flag + * to enable errata workaround. + */ + if (soc_device_match(k3_soc_devices)) + priv->habit &= ~UART_HAS_RHR_IT_DIS; } static void omap8250_uart_qos_work(struct work_struct *work) @@ -761,17 +775,27 @@ static void __dma_rx_do_complete(struct uart_8250_port *p) { struct uart_8250_dma *dma = p->dma; struct tty_port *tty_port = &p->port.state->port; + struct omap8250_priv *priv = p->port.private_data; struct dma_chan *rxchan = dma->rxchan; dma_cookie_t cookie; struct dma_tx_state state; int count; int ret; + u32 reg; if (!dma->rx_running) goto out; cookie = dma->rx_cookie; dma->rx_running = 0; + + /* Re-enable RX FIFO interrupt now that transfer is complete */ + if (priv->habit & UART_HAS_RHR_IT_DIS) { + reg = serial_in(p, UART_OMAP_IER2); + reg &= ~UART_OMAP_IER2_RHR_IT_DIS; + serial_out(p, UART_OMAP_IER2, UART_OMAP_IER2_RHR_IT_DIS); + } + dmaengine_tx_status(rxchan, cookie, &state); count = dma->rx_size - state.residue + state.in_flight_bytes; @@ -867,6 +891,7 @@ static int omap_8250_rx_dma(struct uart_8250_port *p) int err = 0; struct dma_async_tx_descriptor *desc; unsigned long flags; + u32 reg; if (priv->rx_dma_broken) return -EINVAL; @@ -902,6 +927,17 @@ static int omap_8250_rx_dma(struct uart_8250_port *p) dma->rx_cookie = dmaengine_submit(desc); + /* + * Disable RX FIFO interrupt while RX DMA is enabled, else + * spurious interrupt may be raised when data is in the RX FIFO + * but is yet to be drained by DMA. + */ + if (priv->habit & UART_HAS_RHR_IT_DIS) { + reg = serial_in(p, UART_OMAP_IER2); + reg |= UART_OMAP_IER2_RHR_IT_DIS; + serial_out(p, UART_OMAP_IER2, UART_OMAP_IER2_RHR_IT_DIS); + } + dma_async_issue_pending(dma->rxchan); out: spin_unlock_irqrestore(&priv->rx_dma_lock, flags); @@ -1182,7 +1218,7 @@ static struct omap8250_dma_params am33xx_dma = { static struct omap8250_platdata am654_platdata = { .dma_params = &am654_dma, - .habit = UART_HAS_EFR2, + .habit = UART_HAS_EFR2 | UART_HAS_RHR_IT_DIS, }; static struct omap8250_platdata am33xx_platdata = { diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c index d5a513efb261..689d8227f95f 100644 --- a/drivers/tty/serial/8250/8250_pci.c +++ b/drivers/tty/serial/8250/8250_pci.c @@ -1964,7 +1964,7 @@ pci_moxa_setup(struct serial_private *priv, * This list is ordered alphabetically by vendor then device. * Specific entries must come before more generic entries. */ -static struct pci_serial_quirk pci_serial_quirks[] __refdata = { +static struct pci_serial_quirk pci_serial_quirks[] = { /* * ADDI-DATA GmbH communication cards <info@addi-data.com> */ diff --git a/drivers/tty/serial/8250/serial_cs.c b/drivers/tty/serial/8250/serial_cs.c index e3d10794dbba..35ff6627c61b 100644 --- a/drivers/tty/serial/8250/serial_cs.c +++ b/drivers/tty/serial/8250/serial_cs.c @@ -559,16 +559,13 @@ static int multi_config(struct pcmcia_device *link) */ if (info->manfid == MANFID_OXSEMI || (info->manfid == MANFID_POSSIO && info->prodid == PRODID_POSSIO_GCC)) { - int err; - if (link->config_index == 1 || link->config_index == 3) { - err = setup_serial(link, info, base2, - link->irq); + setup_serial(link, info, base2, link->irq); base2 = link->resource[0]->start; } else { - err = setup_serial(link, info, link->resource[0]->start, - link->irq); + setup_serial(link, info, link->resource[0]->start, + link->irq); } info->c950ctrl = base2; |