diff options
Diffstat (limited to 'drivers/tty')
-rw-r--r-- | drivers/tty/n_gsm.c | 140 | ||||
-rw-r--r-- | drivers/tty/serial/8250/8250_bcm7271.c | 101 | ||||
-rw-r--r-- | drivers/tty/serial/max3100.c | 22 | ||||
-rw-r--r-- | drivers/tty/serial/sc16is7xx.c | 2 | ||||
-rw-r--r-- | drivers/tty/serial/sh-sci.c | 5 |
5 files changed, 182 insertions, 88 deletions
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index 4ff3010a82ea..aae9f73585bd 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -178,16 +178,18 @@ struct gsm_control { enum gsm_mux_state { GSM_SEARCH, - GSM_START, - GSM_ADDRESS, - GSM_CONTROL, - GSM_LEN, - GSM_DATA, - GSM_FCS, - GSM_OVERRUN, - GSM_LEN0, - GSM_LEN1, - GSM_SSOF, + GSM0_ADDRESS, + GSM0_CONTROL, + GSM0_LEN0, + GSM0_LEN1, + GSM0_DATA, + GSM0_FCS, + GSM0_SSOF, + GSM1_START, + GSM1_ADDRESS, + GSM1_CONTROL, + GSM1_DATA, + GSM1_OVERRUN, }; /* @@ -2162,6 +2164,30 @@ invalid: return; } +/** + * gsm0_receive_state_check_and_fix - check and correct receive state + * @gsm: gsm data for this ldisc instance + * + * Ensures that the current receive state is valid for basic option mode. + */ + +static void gsm0_receive_state_check_and_fix(struct gsm_mux *gsm) +{ + switch (gsm->state) { + case GSM_SEARCH: + case GSM0_ADDRESS: + case GSM0_CONTROL: + case GSM0_LEN0: + case GSM0_LEN1: + case GSM0_DATA: + case GSM0_FCS: + case GSM0_SSOF: + break; + default: + gsm->state = GSM_SEARCH; + break; + } +} /** * gsm0_receive - perform processing for non-transparency @@ -2175,26 +2201,27 @@ static void gsm0_receive(struct gsm_mux *gsm, unsigned char c) { unsigned int len; + gsm0_receive_state_check_and_fix(gsm); switch (gsm->state) { case GSM_SEARCH: /* SOF marker */ if (c == GSM0_SOF) { - gsm->state = GSM_ADDRESS; + gsm->state = GSM0_ADDRESS; gsm->address = 0; gsm->len = 0; gsm->fcs = INIT_FCS; } break; - case GSM_ADDRESS: /* Address EA */ + case GSM0_ADDRESS: /* Address EA */ gsm->fcs = gsm_fcs_add(gsm->fcs, c); if (gsm_read_ea(&gsm->address, c)) - gsm->state = GSM_CONTROL; + gsm->state = GSM0_CONTROL; break; - case GSM_CONTROL: /* Control Byte */ + case GSM0_CONTROL: /* Control Byte */ gsm->fcs = gsm_fcs_add(gsm->fcs, c); gsm->control = c; - gsm->state = GSM_LEN0; + gsm->state = GSM0_LEN0; break; - case GSM_LEN0: /* Length EA */ + case GSM0_LEN0: /* Length EA */ gsm->fcs = gsm_fcs_add(gsm->fcs, c); if (gsm_read_ea(&gsm->len, c)) { if (gsm->len > gsm->mru) { @@ -2204,14 +2231,14 @@ static void gsm0_receive(struct gsm_mux *gsm, unsigned char c) } gsm->count = 0; if (!gsm->len) - gsm->state = GSM_FCS; + gsm->state = GSM0_FCS; else - gsm->state = GSM_DATA; + gsm->state = GSM0_DATA; break; } - gsm->state = GSM_LEN1; + gsm->state = GSM0_LEN1; break; - case GSM_LEN1: + case GSM0_LEN1: gsm->fcs = gsm_fcs_add(gsm->fcs, c); len = c; gsm->len |= len << 7; @@ -2222,26 +2249,29 @@ static void gsm0_receive(struct gsm_mux *gsm, unsigned char c) } gsm->count = 0; if (!gsm->len) - gsm->state = GSM_FCS; + gsm->state = GSM0_FCS; else - gsm->state = GSM_DATA; + gsm->state = GSM0_DATA; break; - case GSM_DATA: /* Data */ + case GSM0_DATA: /* Data */ gsm->buf[gsm->count++] = c; - if (gsm->count == gsm->len) { + if (gsm->count >= MAX_MRU) { + gsm->bad_size++; + gsm->state = GSM_SEARCH; + } else if (gsm->count >= gsm->len) { /* Calculate final FCS for UI frames over all data */ if ((gsm->control & ~PF) != UIH) { gsm->fcs = gsm_fcs_add_block(gsm->fcs, gsm->buf, gsm->count); } - gsm->state = GSM_FCS; + gsm->state = GSM0_FCS; } break; - case GSM_FCS: /* FCS follows the packet */ + case GSM0_FCS: /* FCS follows the packet */ gsm->fcs = gsm_fcs_add(gsm->fcs, c); - gsm->state = GSM_SSOF; + gsm->state = GSM0_SSOF; break; - case GSM_SSOF: + case GSM0_SSOF: gsm->state = GSM_SEARCH; if (c == GSM0_SOF) gsm_queue(gsm); @@ -2255,6 +2285,29 @@ static void gsm0_receive(struct gsm_mux *gsm, unsigned char c) } /** + * gsm1_receive_state_check_and_fix - check and correct receive state + * @gsm: gsm data for this ldisc instance + * + * Ensures that the current receive state is valid for advanced option mode. + */ + +static void gsm1_receive_state_check_and_fix(struct gsm_mux *gsm) +{ + switch (gsm->state) { + case GSM_SEARCH: + case GSM1_START: + case GSM1_ADDRESS: + case GSM1_CONTROL: + case GSM1_DATA: + case GSM1_OVERRUN: + break; + default: + gsm->state = GSM_SEARCH; + break; + } +} + +/** * gsm1_receive - perform processing for non-transparency * @gsm: gsm data for this ldisc instance * @c: character @@ -2264,6 +2317,7 @@ static void gsm0_receive(struct gsm_mux *gsm, unsigned char c) static void gsm1_receive(struct gsm_mux *gsm, unsigned char c) { + gsm1_receive_state_check_and_fix(gsm); /* handle XON/XOFF */ if ((c & ISO_IEC_646_MASK) == XON) { gsm->constipated = true; @@ -2276,11 +2330,11 @@ static void gsm1_receive(struct gsm_mux *gsm, unsigned char c) } if (c == GSM1_SOF) { /* EOF is only valid in frame if we have got to the data state */ - if (gsm->state == GSM_DATA) { + if (gsm->state == GSM1_DATA) { if (gsm->count < 1) { /* Missing FSC */ gsm->malformed++; - gsm->state = GSM_START; + gsm->state = GSM1_START; return; } /* Remove the FCS from data */ @@ -2296,14 +2350,14 @@ static void gsm1_receive(struct gsm_mux *gsm, unsigned char c) gsm->fcs = gsm_fcs_add(gsm->fcs, gsm->buf[gsm->count]); gsm->len = gsm->count; gsm_queue(gsm); - gsm->state = GSM_START; + gsm->state = GSM1_START; return; } /* Any partial frame was a runt so go back to start */ - if (gsm->state != GSM_START) { + if (gsm->state != GSM1_START) { if (gsm->state != GSM_SEARCH) gsm->malformed++; - gsm->state = GSM_START; + gsm->state = GSM1_START; } /* A SOF in GSM_START means we are still reading idling or framing bytes */ @@ -2324,30 +2378,30 @@ static void gsm1_receive(struct gsm_mux *gsm, unsigned char c) gsm->escape = false; } switch (gsm->state) { - case GSM_START: /* First byte after SOF */ + case GSM1_START: /* First byte after SOF */ gsm->address = 0; - gsm->state = GSM_ADDRESS; + gsm->state = GSM1_ADDRESS; gsm->fcs = INIT_FCS; fallthrough; - case GSM_ADDRESS: /* Address continuation */ + case GSM1_ADDRESS: /* Address continuation */ gsm->fcs = gsm_fcs_add(gsm->fcs, c); if (gsm_read_ea(&gsm->address, c)) - gsm->state = GSM_CONTROL; + gsm->state = GSM1_CONTROL; break; - case GSM_CONTROL: /* Control Byte */ + case GSM1_CONTROL: /* Control Byte */ gsm->fcs = gsm_fcs_add(gsm->fcs, c); gsm->control = c; gsm->count = 0; - gsm->state = GSM_DATA; + gsm->state = GSM1_DATA; break; - case GSM_DATA: /* Data */ - if (gsm->count > gsm->mru) { /* Allow one for the FCS */ - gsm->state = GSM_OVERRUN; + case GSM1_DATA: /* Data */ + if (gsm->count > gsm->mru || gsm->count > MAX_MRU) { /* Allow one for the FCS */ + gsm->state = GSM1_OVERRUN; gsm->bad_size++; } else gsm->buf[gsm->count++] = c; break; - case GSM_OVERRUN: /* Over-long - eg a dropped SOF */ + case GSM1_OVERRUN: /* Over-long - eg a dropped SOF */ break; default: pr_debug("%s: unhandled state: %d\n", __func__, gsm->state); diff --git a/drivers/tty/serial/8250/8250_bcm7271.c b/drivers/tty/serial/8250/8250_bcm7271.c index f95047160b4d..8a32418feb74 100644 --- a/drivers/tty/serial/8250/8250_bcm7271.c +++ b/drivers/tty/serial/8250/8250_bcm7271.c @@ -674,18 +674,46 @@ static void init_real_clk_rates(struct device *dev, struct brcmuart_priv *priv) clk_set_rate(priv->baud_mux_clk, priv->default_mux_rate); } +static u32 find_quot(struct device *dev, u32 freq, u32 baud, u32 *percent) +{ + u32 quot; + u32 rate; + u64 hires_rate; + u64 hires_baud; + u64 hires_err; + + rate = freq / 16; + quot = DIV_ROUND_CLOSEST(rate, baud); + if (!quot) + return 0; + + /* increase resolution to get xx.xx percent */ + hires_rate = div_u64((u64)rate * 10000, (u64)quot); + hires_baud = (u64)baud * 10000; + + /* get the delta */ + if (hires_rate > hires_baud) + hires_err = (hires_rate - hires_baud); + else + hires_err = (hires_baud - hires_rate); + + *percent = (unsigned long)DIV_ROUND_CLOSEST_ULL(hires_err, baud); + + dev_dbg(dev, "Baud rate: %u, MUX Clk: %u, Error: %u.%u%%\n", + baud, freq, *percent / 100, *percent % 100); + + return quot; +} + static void set_clock_mux(struct uart_port *up, struct brcmuart_priv *priv, u32 baud) { u32 percent; u32 best_percent = UINT_MAX; u32 quot; + u32 freq; u32 best_quot = 1; - u32 rate; - int best_index = -1; - u64 hires_rate; - u64 hires_baud; - u64 hires_err; + u32 best_freq = 0; int rc; int i; int real_baud; @@ -694,44 +722,35 @@ static void set_clock_mux(struct uart_port *up, struct brcmuart_priv *priv, if (priv->baud_mux_clk == NULL) return; - /* Find the closest match for specified baud */ - for (i = 0; i < ARRAY_SIZE(priv->real_rates); i++) { - if (priv->real_rates[i] == 0) - continue; - rate = priv->real_rates[i] / 16; - quot = DIV_ROUND_CLOSEST(rate, baud); - if (!quot) - continue; - - /* increase resolution to get xx.xx percent */ - hires_rate = (u64)rate * 10000; - hires_baud = (u64)baud * 10000; - - hires_err = div_u64(hires_rate, (u64)quot); - - /* get the delta */ - if (hires_err > hires_baud) - hires_err = (hires_err - hires_baud); - else - hires_err = (hires_baud - hires_err); - - percent = (unsigned long)DIV_ROUND_CLOSEST_ULL(hires_err, baud); - dev_dbg(up->dev, - "Baud rate: %u, MUX Clk: %u, Error: %u.%u%%\n", - baud, priv->real_rates[i], percent / 100, - percent % 100); - if (percent < best_percent) { - best_percent = percent; - best_index = i; - best_quot = quot; + /* Try default_mux_rate first */ + quot = find_quot(up->dev, priv->default_mux_rate, baud, &percent); + if (quot) { + best_percent = percent; + best_freq = priv->default_mux_rate; + best_quot = quot; + } + /* If more than 1% error, find the closest match for specified baud */ + if (best_percent > 100) { + for (i = 0; i < ARRAY_SIZE(priv->real_rates); i++) { + freq = priv->real_rates[i]; + if (freq == 0 || freq == priv->default_mux_rate) + continue; + quot = find_quot(up->dev, freq, baud, &percent); + if (!quot) + continue; + + if (percent < best_percent) { + best_percent = percent; + best_freq = freq; + best_quot = quot; + } } } - if (best_index == -1) { + if (!best_freq) { dev_err(up->dev, "Error, %d BAUD rate is too fast.\n", baud); return; } - rate = priv->real_rates[best_index]; - rc = clk_set_rate(priv->baud_mux_clk, rate); + rc = clk_set_rate(priv->baud_mux_clk, best_freq); if (rc) dev_err(up->dev, "Error selecting BAUD MUX clock\n"); @@ -740,8 +759,8 @@ static void set_clock_mux(struct uart_port *up, struct brcmuart_priv *priv, dev_err(up->dev, "Error, baud: %d has %u.%u%% error\n", baud, percent / 100, percent % 100); - real_baud = rate / 16 / best_quot; - dev_dbg(up->dev, "Selecting BAUD MUX rate: %u\n", rate); + real_baud = best_freq / 16 / best_quot; + dev_dbg(up->dev, "Selecting BAUD MUX rate: %u\n", best_freq); dev_dbg(up->dev, "Requested baud: %u, Actual baud: %u\n", baud, real_baud); @@ -750,7 +769,7 @@ static void set_clock_mux(struct uart_port *up, struct brcmuart_priv *priv, i += (i / 2); priv->char_wait = ns_to_ktime(i); - up->uartclk = rate; + up->uartclk = best_freq; } static void brcmstb_set_termios(struct uart_port *up, diff --git a/drivers/tty/serial/max3100.c b/drivers/tty/serial/max3100.c index 3c92d4e01488..8290ab72c05a 100644 --- a/drivers/tty/serial/max3100.c +++ b/drivers/tty/serial/max3100.c @@ -45,6 +45,9 @@ #include <linux/freezer.h> #include <linux/tty.h> #include <linux/tty_flip.h> +#include <linux/types.h> + +#include <asm/unaligned.h> #include <linux/serial_max3100.h> @@ -191,7 +194,7 @@ static void max3100_timeout(struct timer_list *t) static int max3100_sr(struct max3100_port *s, u16 tx, u16 *rx) { struct spi_message message; - u16 etx, erx; + __be16 etx, erx; int status; struct spi_transfer tran = { .tx_buf = &etx, @@ -213,7 +216,7 @@ static int max3100_sr(struct max3100_port *s, u16 tx, u16 *rx) return 0; } -static int max3100_handlerx(struct max3100_port *s, u16 rx) +static int max3100_handlerx_unlocked(struct max3100_port *s, u16 rx) { unsigned int ch, flg, status = 0; int ret = 0, cts; @@ -253,6 +256,17 @@ static int max3100_handlerx(struct max3100_port *s, u16 rx) return ret; } +static int max3100_handlerx(struct max3100_port *s, u16 rx) +{ + unsigned long flags; + int ret; + + uart_port_lock_irqsave(&s->port, &flags); + ret = max3100_handlerx_unlocked(s, rx); + uart_port_unlock_irqrestore(&s->port, flags); + return ret; +} + static void max3100_work(struct work_struct *w) { struct max3100_port *s = container_of(w, struct max3100_port, work); @@ -740,13 +754,14 @@ static int max3100_probe(struct spi_device *spi) mutex_lock(&max3100s_lock); if (!uart_driver_registered) { - uart_driver_registered = 1; retval = uart_register_driver(&max3100_uart_driver); if (retval) { printk(KERN_ERR "Couldn't register max3100 uart driver\n"); mutex_unlock(&max3100s_lock); return retval; } + + uart_driver_registered = 1; } for (i = 0; i < MAX_MAX3100; i++) @@ -832,6 +847,7 @@ static int max3100_remove(struct spi_device *spi) } pr_debug("removing max3100 driver\n"); uart_unregister_driver(&max3100_uart_driver); + uart_driver_registered = 0; mutex_unlock(&max3100s_lock); return 0; diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index 0066a0e23516..35f8675db1d8 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -18,6 +18,7 @@ #include <linux/module.h> #include <linux/property.h> #include <linux/regmap.h> +#include <linux/sched.h> #include <linux/serial_core.h> #include <linux/serial.h> #include <linux/tty.h> @@ -25,7 +26,6 @@ #include <linux/spi/spi.h> #include <linux/uaccess.h> #include <linux/units.h> -#include <uapi/linux/sched/types.h> #define SC16IS7XX_NAME "sc16is7xx" #define SC16IS7XX_MAX_DEVS 8 diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 25318176091b..6cd7bd7b6782 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -1255,9 +1255,14 @@ static void sci_dma_rx_chan_invalidate(struct sci_port *s) static void sci_dma_rx_release(struct sci_port *s) { struct dma_chan *chan = s->chan_rx_saved; + struct uart_port *port = &s->port; + unsigned long flags; + uart_port_lock_irqsave(port, &flags); s->chan_rx_saved = NULL; sci_dma_rx_chan_invalidate(s); + uart_port_unlock_irqrestore(port, flags); + dmaengine_terminate_sync(chan); dma_free_coherent(chan->device->dev, s->buf_len_rx * 2, s->rx_buf[0], sg_dma_address(&s->sg_rx[0])); |