diff options
Diffstat (limited to 'drivers/tty/serial/8250')
| -rw-r--r-- | drivers/tty/serial/8250/8250.h | 2 | ||||
| -rw-r--r-- | drivers/tty/serial/8250/8250_core.c | 230 | ||||
| -rw-r--r-- | drivers/tty/serial/8250/8250_dw.c | 190 | ||||
| -rw-r--r-- | drivers/tty/serial/8250/8250_fsl.c | 3 | ||||
| -rw-r--r-- | drivers/tty/serial/8250/8250_pci.c | 6 |
5 files changed, 285 insertions, 146 deletions
diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h index 1ebf8538b4fa..1b08c918cd51 100644 --- a/drivers/tty/serial/8250/8250.h +++ b/drivers/tty/serial/8250/8250.h @@ -12,6 +12,7 @@ */ #include <linux/serial_8250.h> +#include <linux/serial_reg.h> #include <linux/dmaengine.h> struct uart_8250_dma { @@ -60,6 +61,7 @@ struct serial8250_config { unsigned short fifo_size; unsigned short tx_loadsz; unsigned char fcr; + unsigned char rxtrig_bytes[UART_FCR_R_TRIG_MAX_STATE]; unsigned int flags; }; diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 7a91c6d1eb7d..1d42dba6121d 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -31,7 +31,6 @@ #include <linux/tty.h> #include <linux/ratelimit.h> #include <linux/tty_flip.h> -#include <linux/serial_reg.h> #include <linux/serial_core.h> #include <linux/serial.h> #include <linux/serial_8250.h> @@ -161,6 +160,7 @@ static const struct serial8250_config uart_config[] = { .fifo_size = 16, .tx_loadsz = 16, .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, + .rxtrig_bytes = {1, 4, 8, 14}, .flags = UART_CAP_FIFO, }, [PORT_CIRRUS] = { @@ -180,6 +180,7 @@ static const struct serial8250_config uart_config[] = { .tx_loadsz = 16, .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_00, + .rxtrig_bytes = {8, 16, 24, 28}, .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, }, [PORT_16750] = { @@ -188,6 +189,7 @@ static const struct serial8250_config uart_config[] = { .tx_loadsz = 64, .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 | UART_FCR7_64BYTE, + .rxtrig_bytes = {1, 16, 32, 56}, .flags = UART_CAP_FIFO | UART_CAP_SLEEP | UART_CAP_AFE, }, [PORT_STARTECH] = { @@ -209,6 +211,7 @@ static const struct serial8250_config uart_config[] = { .tx_loadsz = 32, .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_10, + .rxtrig_bytes = {8, 16, 56, 60}, .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, }, [PORT_16850] = { @@ -266,6 +269,7 @@ static const struct serial8250_config uart_config[] = { .tx_loadsz = 8, .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01, + .rxtrig_bytes = {1, 4, 8, 14}, .flags = UART_CAP_FIFO | UART_CAP_RTOIE, }, [PORT_XR17D15X] = { @@ -439,8 +443,7 @@ static int exar_handle_irq(struct uart_port *port); static void set_io_from_upio(struct uart_port *p) { - struct uart_8250_port *up = - container_of(p, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(p); up->dl_read = default_serial_dl_read; up->dl_write = default_serial_dl_write; @@ -531,11 +534,8 @@ static void serial8250_clear_fifos(struct uart_8250_port *p) void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p) { - unsigned char fcr; - serial8250_clear_fifos(p); - fcr = uart_config[p->port.type].fcr; - serial_out(p, UART_FCR, fcr); + serial_out(p, UART_FCR, p->fcr); } EXPORT_SYMBOL_GPL(serial8250_clear_and_reinit_fifos); @@ -1277,8 +1277,7 @@ static inline void __stop_tx(struct uart_8250_port *p) static void serial8250_stop_tx(struct uart_port *port) { - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); __stop_tx(up); @@ -1293,8 +1292,7 @@ static void serial8250_stop_tx(struct uart_port *port) static void serial8250_start_tx(struct uart_port *port) { - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); if (up->dma && !serial8250_tx_dma(up)) { return; @@ -1322,8 +1320,7 @@ static void serial8250_start_tx(struct uart_port *port) static void serial8250_stop_rx(struct uart_port *port) { - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); up->ier &= ~UART_IER_RLSI; up->port.read_status_mask &= ~UART_LSR_DR; @@ -1332,8 +1329,7 @@ static void serial8250_stop_rx(struct uart_port *port) static void serial8250_enable_ms(struct uart_port *port) { - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); /* no MSR capabilities */ if (up->bugs & UART_BUG_NOMSR) @@ -1499,8 +1495,7 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir) { unsigned char status; unsigned long flags; - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); int dma_err = 0; if (iir & UART_IIR_NO_INT) @@ -1785,8 +1780,7 @@ static void serial8250_backup_timeout(unsigned long data) static unsigned int serial8250_tx_empty(struct uart_port *port) { - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); unsigned long flags; unsigned int lsr; @@ -1800,8 +1794,7 @@ static unsigned int serial8250_tx_empty(struct uart_port *port) static unsigned int serial8250_get_mctrl(struct uart_port *port) { - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); unsigned int status; unsigned int ret; @@ -1821,8 +1814,7 @@ static unsigned int serial8250_get_mctrl(struct uart_port *port) static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl) { - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); unsigned char mcr = 0; if (mctrl & TIOCM_RTS) @@ -1843,8 +1835,7 @@ static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl) static void serial8250_break_ctl(struct uart_port *port, int break_state) { - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); unsigned long flags; spin_lock_irqsave(&port->lock, flags); @@ -1911,8 +1902,7 @@ static void serial8250_put_poll_char(struct uart_port *port, unsigned char c) { unsigned int ier; - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); /* * First save the IER then disable the interrupts @@ -1941,8 +1931,7 @@ static void serial8250_put_poll_char(struct uart_port *port, static int serial8250_startup(struct uart_port *port) { - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); unsigned long flags; unsigned char lsr, iir; int retval; @@ -2194,8 +2183,7 @@ dont_test_tx_en: static void serial8250_shutdown(struct uart_port *port) { - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); unsigned long flags; /* @@ -2268,12 +2256,10 @@ void serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old) { - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); - unsigned char cval, fcr = 0; + struct uart_8250_port *up = up_to_u8250p(port); + unsigned char cval; unsigned long flags; unsigned int baud, quot; - int fifo_bug = 0; switch (termios->c_cflag & CSIZE) { case CS5: @@ -2296,7 +2282,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, if (termios->c_cflag & PARENB) { cval |= UART_LCR_PARITY; if (up->bugs & UART_BUG_PARITY) - fifo_bug = 1; + up->fifo_bug = true; } if (!(termios->c_cflag & PARODD)) cval |= UART_LCR_EPAR; @@ -2320,10 +2306,10 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, quot++; if (up->capabilities & UART_CAP_FIFO && port->fifosize > 1) { - fcr = uart_config[port->type].fcr; - if ((baud < 2400 && !up->dma) || fifo_bug) { - fcr &= ~UART_FCR_TRIGGER_MASK; - fcr |= UART_FCR_TRIGGER_1; + /* NOTE: If fifo_bug is not set, a user can set RX_trigger. */ + if ((baud < 2400 && !up->dma) || up->fifo_bug) { + up->fcr &= ~UART_FCR_TRIGGER_MASK; + up->fcr |= UART_FCR_TRIGGER_1; } } @@ -2456,15 +2442,15 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, * is written without DLAB set, this mode will be disabled. */ if (port->type == PORT_16750) - serial_port_out(port, UART_FCR, fcr); + serial_port_out(port, UART_FCR, up->fcr); serial_port_out(port, UART_LCR, cval); /* reset DLAB */ up->lcr = cval; /* Save LCR */ if (port->type != PORT_16750) { /* emulated UARTs (Lucent Venus 167x) need two steps */ - if (fcr & UART_FCR_ENABLE_FIFO) + if (up->fcr & UART_FCR_ENABLE_FIFO) serial_port_out(port, UART_FCR, UART_FCR_ENABLE_FIFO); - serial_port_out(port, UART_FCR, fcr); /* set fcr */ + serial_port_out(port, UART_FCR, up->fcr); /* set fcr */ } serial8250_set_mctrl(port, port->mctrl); spin_unlock_irqrestore(&port->lock, flags); @@ -2498,8 +2484,7 @@ serial8250_set_ldisc(struct uart_port *port, int new) void serial8250_do_pm(struct uart_port *port, unsigned int state, unsigned int oldstate) { - struct uart_8250_port *p = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *p = up_to_u8250p(port); serial8250_set_sleep(p, state != 0); } @@ -2630,8 +2615,7 @@ static void serial8250_release_rsa_resource(struct uart_8250_port *up) static void serial8250_release_port(struct uart_port *port) { - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); serial8250_release_std_resource(up); if (port->type == PORT_RSA) @@ -2640,8 +2624,7 @@ static void serial8250_release_port(struct uart_port *port) static int serial8250_request_port(struct uart_port *port) { - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); int ret; if (port->type == PORT_8250_CIR) @@ -2657,10 +2640,149 @@ static int serial8250_request_port(struct uart_port *port) return ret; } -static void serial8250_config_port(struct uart_port *port, int flags) +static int fcr_get_rxtrig_bytes(struct uart_8250_port *up) +{ + const struct serial8250_config *conf_type = &uart_config[up->port.type]; + unsigned char bytes; + + bytes = conf_type->rxtrig_bytes[UART_FCR_R_TRIG_BITS(up->fcr)]; + + return bytes ? bytes : -EOPNOTSUPP; +} + +static int bytes_to_fcr_rxtrig(struct uart_8250_port *up, unsigned char bytes) +{ + const struct serial8250_config *conf_type = &uart_config[up->port.type]; + int i; + + if (!conf_type->rxtrig_bytes[UART_FCR_R_TRIG_BITS(UART_FCR_R_TRIG_00)]) + return -EOPNOTSUPP; + + for (i = 1; i < UART_FCR_R_TRIG_MAX_STATE; i++) { + if (bytes < conf_type->rxtrig_bytes[i]) + /* Use the nearest lower value */ + return (--i) << UART_FCR_R_TRIG_SHIFT; + } + + return UART_FCR_R_TRIG_11; +} + +static int do_get_rxtrig(struct tty_port *port) +{ + struct uart_state *state = container_of(port, struct uart_state, port); + struct uart_port *uport = state->uart_port; + struct uart_8250_port *up = + container_of(uport, struct uart_8250_port, port); + + if (!(up->capabilities & UART_CAP_FIFO) || uport->fifosize <= 1) + return -EINVAL; + + return fcr_get_rxtrig_bytes(up); +} + +static int do_serial8250_get_rxtrig(struct tty_port *port) +{ + int rxtrig_bytes; + + mutex_lock(&port->mutex); + rxtrig_bytes = do_get_rxtrig(port); + mutex_unlock(&port->mutex); + + return rxtrig_bytes; +} + +static ssize_t serial8250_get_attr_rx_trig_bytes(struct device *dev, + struct device_attribute *attr, char *buf) { + struct tty_port *port = dev_get_drvdata(dev); + int rxtrig_bytes; + + rxtrig_bytes = do_serial8250_get_rxtrig(port); + if (rxtrig_bytes < 0) + return rxtrig_bytes; + + return snprintf(buf, PAGE_SIZE, "%d\n", rxtrig_bytes); +} + +static int do_set_rxtrig(struct tty_port *port, unsigned char bytes) +{ + struct uart_state *state = container_of(port, struct uart_state, port); + struct uart_port *uport = state->uart_port; struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + container_of(uport, struct uart_8250_port, port); + int rxtrig; + + if (!(up->capabilities & UART_CAP_FIFO) || uport->fifosize <= 1 || + up->fifo_bug) + return -EINVAL; + + rxtrig = bytes_to_fcr_rxtrig(up, bytes); + if (rxtrig < 0) + return rxtrig; + + serial8250_clear_fifos(up); + up->fcr &= ~UART_FCR_TRIGGER_MASK; + up->fcr |= (unsigned char)rxtrig; + serial_out(up, UART_FCR, up->fcr); + return 0; +} + +static int do_serial8250_set_rxtrig(struct tty_port *port, unsigned char bytes) +{ + int ret; + + mutex_lock(&port->mutex); + ret = do_set_rxtrig(port, bytes); + mutex_unlock(&port->mutex); + + return ret; +} + +static ssize_t serial8250_set_attr_rx_trig_bytes(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct tty_port *port = dev_get_drvdata(dev); + unsigned char bytes; + int ret; + + if (!count) + return -EINVAL; + + ret = kstrtou8(buf, 10, &bytes); + if (ret < 0) + return ret; + + ret = do_serial8250_set_rxtrig(port, bytes); + if (ret < 0) + return ret; + + return count; +} + +static DEVICE_ATTR(rx_trig_bytes, S_IRUSR | S_IWUSR | S_IRGRP, + serial8250_get_attr_rx_trig_bytes, + serial8250_set_attr_rx_trig_bytes); + +static struct attribute *serial8250_dev_attrs[] = { + &dev_attr_rx_trig_bytes.attr, + NULL, + }; + +static struct attribute_group serial8250_dev_attr_group = { + .attrs = serial8250_dev_attrs, + }; + +static void register_dev_spec_attr_grp(struct uart_8250_port *up) +{ + const struct serial8250_config *conf_type = &uart_config[up->port.type]; + + if (conf_type->rxtrig_bytes[0]) + up->port.attr_group = &serial8250_dev_attr_group; +} + +static void serial8250_config_port(struct uart_port *port, int flags) +{ + struct uart_8250_port *up = up_to_u8250p(port); int probeflags = PROBE_ANY; int ret; @@ -2705,6 +2827,9 @@ static void serial8250_config_port(struct uart_port *port, int flags) if ((port->type == PORT_XR17V35X) || (port->type == PORT_XR17D15X)) port->handle_irq = exar_handle_irq; + + register_dev_spec_attr_grp(up); + up->fcr = uart_config[up->port.type].fcr; } static int @@ -2859,8 +2984,7 @@ serial8250_register_ports(struct uart_driver *drv, struct device *dev) static void serial8250_console_putchar(struct uart_port *port, int ch) { - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); wait_for_xmitr(up, UART_LSR_THRE); serial_port_out(port, UART_TX, ch); diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index 51b307aab75e..4db7987ec225 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -26,6 +26,7 @@ #include <linux/slab.h> #include <linux/acpi.h> #include <linux/clk.h> +#include <linux/reset.h> #include <linux/pm_runtime.h> #include <asm/byteorder.h> @@ -59,73 +60,17 @@ struct dw8250_data { int last_mcr; int line; struct clk *clk; + struct clk *pclk; + struct reset_control *rst; struct uart_8250_dma dma; }; -struct dw8250_acpi_desc { - void (*set_termios)(struct uart_port *p, struct ktermios *termios, - struct ktermios *old); -}; - #define BYT_PRV_CLK 0x800 #define BYT_PRV_CLK_EN (1 << 0) #define BYT_PRV_CLK_M_VAL_SHIFT 1 #define BYT_PRV_CLK_N_VAL_SHIFT 16 #define BYT_PRV_CLK_UPDATE (1 << 31) -static void byt_set_termios(struct uart_port *p, struct ktermios *termios, - struct ktermios *old) -{ - unsigned int baud = tty_termios_baud_rate(termios); - unsigned int m, n; - u32 reg; - - /* - * For baud rates 0.5M, 1M, 1.5M, 2M, 2.5M, 3M, 3.5M and 4M the - * dividers must be adjusted. - * - * uartclk = (m / n) * 100 MHz, where m <= n - */ - switch (baud) { - case 500000: - case 1000000: - case 2000000: - case 4000000: - m = 64; - n = 100; - p->uartclk = 64000000; - break; - case 3500000: - m = 56; - n = 100; - p->uartclk = 56000000; - break; - case 1500000: - case 3000000: - m = 48; - n = 100; - p->uartclk = 48000000; - break; - case 2500000: - m = 40; - n = 100; - p->uartclk = 40000000; - break; - default: - m = 2304; - n = 3125; - p->uartclk = 73728000; - } - - /* Reset the clock */ - reg = (m << BYT_PRV_CLK_M_VAL_SHIFT) | (n << BYT_PRV_CLK_N_VAL_SHIFT); - writel(reg, p->membase + BYT_PRV_CLK); - reg |= BYT_PRV_CLK_EN | BYT_PRV_CLK_UPDATE; - writel(reg, p->membase + BYT_PRV_CLK); - - serial8250_do_set_termios(p, termios, old); -} - static inline int dw8250_modify_msr(struct uart_port *p, int offset, int value) { struct dw8250_data *d = p->private_data; @@ -141,8 +86,9 @@ static inline int dw8250_modify_msr(struct uart_port *p, int offset, int value) static void dw8250_force_idle(struct uart_port *p) { - serial8250_clear_and_reinit_fifos(container_of - (p, struct uart_8250_port, port)); + struct uart_8250_port *up = up_to_u8250p(p); + + serial8250_clear_and_reinit_fifos(up); (void)p->serial_in(p, UART_RX); } @@ -242,6 +188,32 @@ dw8250_do_pm(struct uart_port *port, unsigned int state, unsigned int old) pm_runtime_put_sync_suspend(port->dev); } +static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios, + struct ktermios *old) +{ + unsigned int baud = tty_termios_baud_rate(termios); + struct dw8250_data *d = p->private_data; + unsigned int rate; + int ret; + + if (IS_ERR(d->clk) || !old) + goto out; + + /* Not requesting clock rates below 1.8432Mhz */ + if (baud < 115200) + baud = 115200; + + clk_disable_unprepare(d->clk); + rate = clk_round_rate(d->clk, baud * 16); + ret = clk_set_rate(d->clk, rate); + clk_prepare_enable(d->clk); + + if (!ret) + p->uartclk = rate; +out: + serial8250_do_set_termios(p, termios, old); +} + static bool dw8250_dma_filter(struct dma_chan *chan, void *param) { struct dw8250_data *data = param; @@ -286,6 +258,7 @@ static int dw8250_probe_of(struct uart_port *p, struct dw8250_data *data) { struct device_node *np = p->dev->of_node; + struct uart_8250_port *up = up_to_u8250p(p); u32 val; bool has_ucv = true; @@ -299,7 +272,7 @@ static int dw8250_probe_of(struct uart_port *p, p->membase += 7; #endif p->serial_out = dw8250_serial_out_rb; - p->flags = ASYNC_SKIP_TEST | UPF_SHARE_IRQ | UPF_FIXED_TYPE; + p->flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_FIXED_TYPE; p->type = PORT_OCTEON; data->usr_reg = 0x27; has_ucv = false; @@ -318,7 +291,7 @@ static int dw8250_probe_of(struct uart_port *p, } } if (has_ucv) - dw8250_setup_port(container_of(p, struct uart_8250_port, port)); + dw8250_setup_port(up); if (!of_property_read_u32(np, "reg-shift", &val)) p->regshift = val; @@ -340,16 +313,10 @@ static int dw8250_probe_of(struct uart_port *p, static int dw8250_probe_acpi(struct uart_8250_port *up, struct dw8250_data *data) { - const struct acpi_device_id *id; struct uart_port *p = &up->port; - struct dw8250_acpi_desc *acpi_desc; dw8250_setup_port(up); - id = acpi_match_device(p->dev->driver->acpi_match_table, p->dev); - if (!id) - return -ENODEV; - p->iotype = UPIO_MEM32; p->serial_in = dw8250_serial_in32; p->serial_out = dw8250_serial_out32; @@ -360,12 +327,7 @@ static int dw8250_probe_acpi(struct uart_8250_port *up, up->dma->rxconf.src_maxburst = p->fifosize / 4; up->dma->txconf.dst_maxburst = p->fifosize / 4; - acpi_desc = (struct dw8250_acpi_desc *)id->driver_data; - if (!acpi_desc) - return 0; - - if (acpi_desc->set_termios) - p->set_termios = acpi_desc->set_termios; + up->port.set_termios = dw8250_set_termios; return 0; } @@ -402,11 +364,40 @@ static int dw8250_probe(struct platform_device *pdev) return -ENOMEM; data->usr_reg = DW_UART_USR; - data->clk = devm_clk_get(&pdev->dev, NULL); + data->clk = devm_clk_get(&pdev->dev, "baudclk"); + if (IS_ERR(data->clk) && PTR_ERR(data->clk) != -EPROBE_DEFER) + data->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(data->clk) && PTR_ERR(data->clk) == -EPROBE_DEFER) + return -EPROBE_DEFER; if (!IS_ERR(data->clk)) { - clk_prepare_enable(data->clk); - uart.port.uartclk = clk_get_rate(data->clk); + err = clk_prepare_enable(data->clk); + if (err) + dev_warn(&pdev->dev, "could not enable optional baudclk: %d\n", + err); + else + uart.port.uartclk = clk_get_rate(data->clk); + } + + data->pclk = devm_clk_get(&pdev->dev, "apb_pclk"); + if (IS_ERR(data->clk) && PTR_ERR(data->clk) == -EPROBE_DEFER) { + err = -EPROBE_DEFER; + goto err_clk; } + if (!IS_ERR(data->pclk)) { + err = clk_prepare_enable(data->pclk); + if (err) { + dev_err(&pdev->dev, "could not enable apb_pclk\n"); + goto err_clk; + } + } + + data->rst = devm_reset_control_get_optional(&pdev->dev, NULL); + if (IS_ERR(data->rst) && PTR_ERR(data->rst) == -EPROBE_DEFER) { + err = -EPROBE_DEFER; + goto err_pclk; + } + if (!IS_ERR(data->rst)) + reset_control_deassert(data->rst); data->dma.rx_chan_id = -1; data->dma.tx_chan_id = -1; @@ -422,18 +413,21 @@ static int dw8250_probe(struct platform_device *pdev) if (pdev->dev.of_node) { err = dw8250_probe_of(&uart.port, data); if (err) - return err; + goto err_reset; } else if (ACPI_HANDLE(&pdev->dev)) { err = dw8250_probe_acpi(&uart, data); if (err) - return err; + goto err_reset; } else { - return -ENODEV; + err = -ENODEV; + goto err_reset; } data->line = serial8250_register_8250_port(&uart); - if (data->line < 0) - return data->line; + if (data->line < 0) { + err = data->line; + goto err_reset; + } platform_set_drvdata(pdev, data); @@ -441,6 +435,20 @@ static int dw8250_probe(struct platform_device *pdev) pm_runtime_enable(&pdev->dev); return 0; + +err_reset: + if (!IS_ERR(data->rst)) + reset_control_assert(data->rst); + +err_pclk: + if (!IS_ERR(data->pclk)) + clk_disable_unprepare(data->pclk); + +err_clk: + if (!IS_ERR(data->clk)) + clk_disable_unprepare(data->clk); + + return err; } static int dw8250_remove(struct platform_device *pdev) @@ -451,6 +459,12 @@ static int dw8250_remove(struct platform_device *pdev) serial8250_unregister_port(data->line); + if (!IS_ERR(data->rst)) + reset_control_assert(data->rst); + + if (!IS_ERR(data->pclk)) + clk_disable_unprepare(data->pclk); + if (!IS_ERR(data->clk)) clk_disable_unprepare(data->clk); @@ -488,6 +502,9 @@ static int dw8250_runtime_suspend(struct device *dev) if (!IS_ERR(data->clk)) clk_disable_unprepare(data->clk); + if (!IS_ERR(data->pclk)) + clk_disable_unprepare(data->pclk); + return 0; } @@ -495,6 +512,9 @@ static int dw8250_runtime_resume(struct device *dev) { struct dw8250_data *data = dev_get_drvdata(dev); + if (!IS_ERR(data->pclk)) + clk_prepare_enable(data->pclk); + if (!IS_ERR(data->clk)) clk_prepare_enable(data->clk); @@ -514,16 +534,12 @@ static const struct of_device_id dw8250_of_match[] = { }; MODULE_DEVICE_TABLE(of, dw8250_of_match); -static struct dw8250_acpi_desc byt_8250_desc = { - .set_termios = byt_set_termios, -}; - static const struct acpi_device_id dw8250_acpi_match[] = { { "INT33C4", 0 }, { "INT33C5", 0 }, { "INT3434", 0 }, { "INT3435", 0 }, - { "80860F0A", (kernel_ulong_t)&byt_8250_desc}, + { "80860F0A", 0 }, { }, }; MODULE_DEVICE_TABLE(acpi, dw8250_acpi_match); diff --git a/drivers/tty/serial/8250/8250_fsl.c b/drivers/tty/serial/8250/8250_fsl.c index f4d3c47b88e8..c0533a57ec53 100644 --- a/drivers/tty/serial/8250/8250_fsl.c +++ b/drivers/tty/serial/8250/8250_fsl.c @@ -28,8 +28,7 @@ int fsl8250_handle_irq(struct uart_port *port) unsigned char lsr, orig_lsr; unsigned long flags; unsigned int iir; - struct uart_8250_port *up = - container_of(port, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(port); spin_lock_irqsave(&up->port.lock, flags); diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c index 33137b3ba94d..61830b1792eb 100644 --- a/drivers/tty/serial/8250/8250_pci.c +++ b/drivers/tty/serial/8250/8250_pci.c @@ -1581,8 +1581,7 @@ static int skip_tx_en_setup(struct serial_private *priv, static void kt_handle_break(struct uart_port *p) { - struct uart_8250_port *up = - container_of(p, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(p); /* * On receipt of a BI, serial device in Intel ME (Intel * management engine) needs to have its fifos cleared for sane @@ -1593,8 +1592,7 @@ static void kt_handle_break(struct uart_port *p) static unsigned int kt_serial_in(struct uart_port *p, int offset) { - struct uart_8250_port *up = - container_of(p, struct uart_8250_port, port); + struct uart_8250_port *up = up_to_u8250p(p); unsigned int val; /* |