From 6db201da2522d7dd231982ff7b83916cf4db3e41 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Fri, 6 Dec 2013 10:59:11 +0100 Subject: serial: sh-sci: Remove baud rate calculation algorithm 5 The algorithm isn't used, remove it. Signed-off-by: Laurent Pinchart Acked-by: Greg Kroah-Hartman Signed-off-by: Simon Horman --- include/linux/serial_sci.h | 1 - 1 file changed, 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/serial_sci.h b/include/linux/serial_sci.h index 50fe651da965..babc5fe070b9 100644 --- a/include/linux/serial_sci.h +++ b/include/linux/serial_sci.h @@ -15,7 +15,6 @@ enum { SCBRR_ALGO_2, /* ((clk + 16 * bps) / (32 * bps) - 1) */ SCBRR_ALGO_3, /* (((clk * 2) + 16 * bps) / (16 * bps) - 1) */ SCBRR_ALGO_4, /* (((clk * 2) + 16 * bps) / (32 * bps) - 1) */ - SCBRR_ALGO_5, /* (((clk * 1000 / 32) / bps) - 1) */ SCBRR_ALGO_6, /* HSCIF variable sample rate algorithm */ }; -- cgit From 6557b1f69ea0961efde7ab33bfe0cb7e3bfed54e Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Fri, 6 Dec 2013 10:59:12 +0100 Subject: serial: sh-sci: Simplify baud rate calculation algorithms Rewrite the baud rate register value calculations in easier to read forms. The computed value isn't modified. Signed-off-by: Laurent Pinchart Acked-by: Greg Kroah-Hartman Signed-off-by: Simon Horman --- drivers/tty/serial/sh-sci.c | 8 ++++---- include/linux/serial_sci.h | 8 ++++---- 2 files changed, 8 insertions(+), 8 deletions(-) (limited to 'include/linux') diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index eb59bb235a52..f2fad4d8eb9e 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -1818,13 +1818,13 @@ static unsigned int sci_scbrr_calc(unsigned int algo_id, unsigned int bps, { switch (algo_id) { case SCBRR_ALGO_1: - return ((freq + 16 * bps) / (16 * bps) - 1); + return freq / (16 * bps); case SCBRR_ALGO_2: - return ((freq + 16 * bps) / (32 * bps) - 1); + return DIV_ROUND_CLOSEST(freq, 32 * bps) - 1; case SCBRR_ALGO_3: - return (((freq * 2) + 16 * bps) / (16 * bps) - 1); + return freq / (8 * bps); case SCBRR_ALGO_4: - return (((freq * 2) + 16 * bps) / (32 * bps) - 1); + return DIV_ROUND_CLOSEST(freq, 16 * bps) - 1; } /* Warn, but use a safe default */ diff --git a/include/linux/serial_sci.h b/include/linux/serial_sci.h index babc5fe070b9..12cf50c1c047 100644 --- a/include/linux/serial_sci.h +++ b/include/linux/serial_sci.h @@ -11,10 +11,10 @@ #define SCIx_NOT_SUPPORTED (-1) enum { - SCBRR_ALGO_1, /* ((clk + 16 * bps) / (16 * bps) - 1) */ - SCBRR_ALGO_2, /* ((clk + 16 * bps) / (32 * bps) - 1) */ - SCBRR_ALGO_3, /* (((clk * 2) + 16 * bps) / (16 * bps) - 1) */ - SCBRR_ALGO_4, /* (((clk * 2) + 16 * bps) / (32 * bps) - 1) */ + SCBRR_ALGO_1, /* clk / (16 * bps) */ + SCBRR_ALGO_2, /* DIV_ROUND_CLOSEST(clk, 32 * bps) - 1 */ + SCBRR_ALGO_3, /* clk / (8 * bps) */ + SCBRR_ALGO_4, /* DIV_ROUND_CLOSEST(clk, 16 * bps) - 1 */ SCBRR_ALGO_6, /* HSCIF variable sample rate algorithm */ }; -- cgit From 1fcc91a607de0bf72d3a6073dfe459f7e9145ac5 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Fri, 6 Dec 2013 10:59:16 +0100 Subject: serial: sh-sci: Support resources passed through platform resources Memory and IRQ resources are currently passed to the driver through platform data. Support passing them through the standard platform resources mechanism instead. This deprecates platform data resources. Signed-off-by: Laurent Pinchart Acked-by: Greg Kroah-Hartman Signed-off-by: Simon Horman --- drivers/tty/serial/sh-sci.c | 65 ++++++++++++++++++++++++++++++++++----------- include/linux/serial_sci.h | 8 +++--- 2 files changed, 53 insertions(+), 20 deletions(-) (limited to 'include/linux') diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index b3d0e00ecedf..e9c6e2339884 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -74,6 +74,7 @@ struct sci_port { /* Function clock */ struct clk *fclk; + int irqs[SCIx_NR_IRQS]; char *irqstr[SCIx_NR_IRQS]; char *gpiostr[SCIx_NR_FNS]; @@ -1079,19 +1080,19 @@ static int sci_request_irq(struct sci_port *port) for (i = j = 0; i < SCIx_NR_IRQS; i++, j++) { struct sci_irq_desc *desc; - unsigned int irq; + int irq; if (SCIx_IRQ_IS_MUXED(port)) { i = SCIx_MUX_IRQ; irq = up->irq; } else { - irq = port->cfg->irqs[i]; + irq = port->irqs[i]; /* * Certain port types won't support all of the * available interrupt sources. */ - if (unlikely(!irq)) + if (unlikely(irq < 0)) continue; } @@ -1116,7 +1117,7 @@ static int sci_request_irq(struct sci_port *port) out_noirq: while (--i >= 0) - free_irq(port->cfg->irqs[i], port); + free_irq(port->irqs[i], port); out_nomem: while (--j >= 0) @@ -1134,16 +1135,16 @@ static void sci_free_irq(struct sci_port *port) * IRQ first. */ for (i = 0; i < SCIx_NR_IRQS; i++) { - unsigned int irq = port->cfg->irqs[i]; + int irq = port->irqs[i]; /* * Certain port types won't support all of the available * interrupt sources. */ - if (unlikely(!irq)) + if (unlikely(irq < 0)) continue; - free_irq(port->cfg->irqs[i], port); + free_irq(port->irqs[i], port); kfree(port->irqstr[i]); if (SCIx_IRQ_IS_MUXED(port)) { @@ -1659,7 +1660,7 @@ static void rx_timer_fn(unsigned long arg) if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { scr &= ~0x4000; - enable_irq(s->cfg->irqs[1]); + enable_irq(s->irqs[SCIx_RXI_IRQ]); } serial_port_out(port, SCSCR, scr | SCSCR_RIE); dev_dbg(port->dev, "DMA Rx timed out\n"); @@ -2150,11 +2151,12 @@ static struct uart_ops sci_uart_ops = { }; static int sci_init_single(struct platform_device *dev, - struct sci_port *sci_port, - unsigned int index, - struct plat_sci_port *p) + struct sci_port *sci_port, unsigned int index, + struct plat_sci_port *p, bool early) { struct uart_port *port = &sci_port->port; + const struct resource *res; + unsigned int i; int ret; sci_port->cfg = p; @@ -2163,6 +2165,38 @@ static int sci_init_single(struct platform_device *dev, port->iotype = UPIO_MEM; port->line = index; + if (dev->num_resources) { + /* Device has resources, use them. */ + res = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (res == NULL) + return -ENOMEM; + + port->mapbase = res->start; + + for (i = 0; i < ARRAY_SIZE(sci_port->irqs); ++i) + sci_port->irqs[i] = platform_get_irq(dev, i); + + /* The SCI generates several interrupts. They can be muxed + * together or connected to different interrupt lines. In the + * muxed case only one interrupt resource is specified. In the + * non-muxed case three or four interrupt resources are + * specified, as the BRI interrupt is optional. + */ + if (sci_port->irqs[0] < 0) + return -ENXIO; + + if (sci_port->irqs[1] < 0) { + sci_port->irqs[1] = sci_port->irqs[0]; + sci_port->irqs[2] = sci_port->irqs[0]; + sci_port->irqs[3] = sci_port->irqs[0]; + } + } else { + /* No resources, use old-style platform data. */ + port->mapbase = p->mapbase; + for (i = 0; i < ARRAY_SIZE(sci_port->irqs); ++i) + sci_port->irqs[i] = p->irqs[i] ? p->irqs[i] : -ENXIO; + } + switch (p->type) { case PORT_SCIFB: port->fifosize = 256; @@ -2187,7 +2221,7 @@ static int sci_init_single(struct platform_device *dev, return ret; } - if (dev) { + if (!early) { sci_port->iclk = clk_get(&dev->dev, "sci_ick"); if (IS_ERR(sci_port->iclk)) { sci_port->iclk = clk_get(&dev->dev, "peripheral_clk"); @@ -2242,7 +2276,6 @@ static int sci_init_single(struct platform_device *dev, p->error_mask |= (1 << p->overrun_bit); } - port->mapbase = p->mapbase; port->type = p->type; port->flags = UPF_FIXED_PORT | p->flags; port->regshift = p->regshift; @@ -2254,7 +2287,7 @@ static int sci_init_single(struct platform_device *dev, * * For the muxed case there's nothing more to do. */ - port->irq = p->irqs[SCIx_RXI_IRQ]; + port->irq = sci_port->irqs[SCIx_RXI_IRQ]; port->irqflags = 0; port->serial_in = sci_serial_in; @@ -2386,7 +2419,7 @@ static int sci_probe_earlyprintk(struct platform_device *pdev) early_serial_console.index = pdev->id; - sci_init_single(NULL, &sci_ports[pdev->id], pdev->id, cfg); + sci_init_single(pdev, &sci_ports[pdev->id], pdev->id, cfg, true); serial_console_setup(&early_serial_console, early_serial_buf); @@ -2453,7 +2486,7 @@ static int sci_probe_single(struct platform_device *dev, return -EINVAL; } - ret = sci_init_single(dev, sciport, index, p); + ret = sci_init_single(dev, sciport, index, p, false); if (ret) return ret; diff --git a/include/linux/serial_sci.h b/include/linux/serial_sci.h index 12cf50c1c047..42620f1dce82 100644 --- a/include/linux/serial_sci.h +++ b/include/linux/serial_sci.h @@ -107,10 +107,10 @@ enum { } #define SCIx_IRQ_IS_MUXED(port) \ - ((port)->cfg->irqs[SCIx_ERI_IRQ] == \ - (port)->cfg->irqs[SCIx_RXI_IRQ]) || \ - ((port)->cfg->irqs[SCIx_ERI_IRQ] && \ - !(port)->cfg->irqs[SCIx_RXI_IRQ]) + ((port)->irqs[SCIx_ERI_IRQ] == \ + (port)->irqs[SCIx_RXI_IRQ]) || \ + ((port)->irqs[SCIx_ERI_IRQ] && \ + ((port)->irqs[SCIx_RXI_IRQ] < 0)) /* * SCI register subset common for all port types. * Not all registers will exist on all parts. -- cgit From 3ae988d97b160c07463b980ccf26ed9226660fef Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Fri, 6 Dec 2013 10:59:17 +0100 Subject: serial: sh-sci: Move overrun_bit and error_mask fields out of pdata None of the fields is ever set by board code, and both of them are set in the driver at probe time. Move them out of struct plat_sci_port to struct sci_port. Signed-off-by: Laurent Pinchart Acked-by: Greg Kroah-Hartman Signed-off-by: Simon Horman --- drivers/tty/serial/sh-sci.c | 50 +++++++++++++++++++++------------------------ drivers/tty/serial/sh-sci.h | 2 +- include/linux/serial_sci.h | 3 --- 3 files changed, 24 insertions(+), 31 deletions(-) (limited to 'include/linux') diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index e9c6e2339884..98b8e3c98586 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -64,6 +64,9 @@ struct sci_port { /* Platform configuration */ struct plat_sci_port *cfg; + int overrun_bit; + unsigned int error_mask; + /* Break timer */ struct timer_list break_timer; @@ -760,19 +763,15 @@ static int sci_handle_errors(struct uart_port *port) struct tty_port *tport = &port->state->port; struct sci_port *s = to_sci_port(port); - /* - * Handle overruns, if supported. - */ - if (s->cfg->overrun_bit != SCIx_NOT_SUPPORTED) { - if (status & (1 << s->cfg->overrun_bit)) { - port->icount.overrun++; + /* Handle overruns */ + if (status & (1 << s->overrun_bit)) { + port->icount.overrun++; - /* overrun error */ - if (tty_insert_flip_char(tport, 0, TTY_OVERRUN)) - copied++; + /* overrun error */ + if (tty_insert_flip_char(tport, 0, TTY_OVERRUN)) + copied++; - dev_notice(port->dev, "overrun error"); - } + dev_notice(port->dev, "overrun error"); } if (status & SCxSR_FER(port)) { @@ -834,7 +833,7 @@ static int sci_handle_fifo_overrun(struct uart_port *port) if (!reg->size) return 0; - if ((serial_port_in(port, SCLSR) & (1 << s->cfg->overrun_bit))) { + if ((serial_port_in(port, SCLSR) & (1 << s->overrun_bit))) { serial_port_out(port, SCLSR, 0); port->icount.overrun++; @@ -2253,28 +2252,25 @@ static int sci_init_single(struct platform_device *dev, /* * Establish some sensible defaults for the error detection. */ - if (!p->error_mask) - p->error_mask = (p->type == PORT_SCI) ? + sci_port->error_mask = (p->type == PORT_SCI) ? SCI_DEFAULT_ERROR_MASK : SCIF_DEFAULT_ERROR_MASK; /* * Establish sensible defaults for the overrun detection, unless * the part has explicitly disabled support for it. */ - if (p->overrun_bit != SCIx_NOT_SUPPORTED) { - if (p->type == PORT_SCI) - p->overrun_bit = 5; - else if (p->scbrr_algo_id == SCBRR_ALGO_4) - p->overrun_bit = 9; - else - p->overrun_bit = 0; + if (p->type == PORT_SCI) + sci_port->overrun_bit = 5; + else if (p->scbrr_algo_id == SCBRR_ALGO_4) + sci_port->overrun_bit = 9; + else + sci_port->overrun_bit = 0; - /* - * Make the error mask inclusive of overrun detection, if - * supported. - */ - p->error_mask |= (1 << p->overrun_bit); - } + /* + * Make the error mask inclusive of overrun detection, if + * supported. + */ + sci_port->error_mask |= 1 << sci_port->overrun_bit; port->type = p->type; port->flags = UPF_FIXED_PORT | p->flags; diff --git a/drivers/tty/serial/sh-sci.h b/drivers/tty/serial/sh-sci.h index 5aca7364634c..d5db81a0a430 100644 --- a/drivers/tty/serial/sh-sci.h +++ b/drivers/tty/serial/sh-sci.h @@ -9,7 +9,7 @@ #define SCxSR_PER(port) (((port)->type == PORT_SCI) ? SCI_PER : SCIF_PER) #define SCxSR_BRK(port) (((port)->type == PORT_SCI) ? 0x00 : SCIF_BRK) -#define SCxSR_ERRORS(port) (to_sci_port(port)->cfg->error_mask) +#define SCxSR_ERRORS(port) (to_sci_port(port)->error_mask) #if defined(CONFIG_CPU_SUBTYPE_SH7705) || \ defined(CONFIG_CPU_SUBTYPE_SH7720) || \ diff --git a/include/linux/serial_sci.h b/include/linux/serial_sci.h index 42620f1dce82..af9834bc6771 100644 --- a/include/linux/serial_sci.h +++ b/include/linux/serial_sci.h @@ -152,9 +152,6 @@ struct plat_sci_port { /* * Platform overrides if necessary, defaults otherwise. */ - int overrun_bit; - unsigned int error_mask; - int port_reg; unsigned char regshift; unsigned char regtype; -- cgit From 520402bbc6fe328ae28e08bfc87a2b1eb7f10b2c Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Fri, 6 Dec 2013 10:59:18 +0100 Subject: serial: sh-sci: Remove unused GPIO request code The driver requests at initialization time GPIOs passed through platform data. No platform makes use of this feature, remove it. Signed-off-by: Laurent Pinchart Acked-by: Greg Kroah-Hartman Signed-off-by: Simon Horman --- drivers/tty/serial/sh-sci.c | 67 --------------------------------------------- include/linux/serial_sci.h | 12 -------- 2 files changed, 79 deletions(-) (limited to 'include/linux') diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 98b8e3c98586..99a64fd16d46 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -32,7 +32,6 @@ #include #include #include -#include #include #include #include @@ -79,7 +78,6 @@ struct sci_port { int irqs[SCIx_NR_IRQS]; char *irqstr[SCIx_NR_IRQS]; - char *gpiostr[SCIx_NR_FNS]; struct dma_chan *chan_tx; struct dma_chan *chan_rx; @@ -1153,67 +1151,6 @@ static void sci_free_irq(struct sci_port *port) } } -static const char *sci_gpio_names[SCIx_NR_FNS] = { - "sck", "rxd", "txd", "cts", "rts", -}; - -static const char *sci_gpio_str(unsigned int index) -{ - return sci_gpio_names[index]; -} - -static void sci_init_gpios(struct sci_port *port) -{ - struct uart_port *up = &port->port; - int i; - - if (!port->cfg) - return; - - for (i = 0; i < SCIx_NR_FNS; i++) { - const char *desc; - int ret; - - if (!port->cfg->gpios[i]) - continue; - - desc = sci_gpio_str(i); - - port->gpiostr[i] = kasprintf(GFP_KERNEL, "%s:%s", - dev_name(up->dev), desc); - - /* - * If we've failed the allocation, we can still continue - * on with a NULL string. - */ - if (!port->gpiostr[i]) - dev_notice(up->dev, "%s string allocation failure\n", - desc); - - ret = gpio_request(port->cfg->gpios[i], port->gpiostr[i]); - if (unlikely(ret != 0)) { - dev_notice(up->dev, "failed %s gpio request\n", desc); - - /* - * If we can't get the GPIO for whatever reason, - * no point in keeping the verbose string around. - */ - kfree(port->gpiostr[i]); - } - } -} - -static void sci_free_gpios(struct sci_port *port) -{ - int i; - - for (i = 0; i < SCIx_NR_FNS; i++) - if (port->cfg->gpios[i]) { - gpio_free(port->cfg->gpios[i]); - kfree(port->gpiostr[i]); - } -} - static unsigned int sci_tx_empty(struct uart_port *port) { unsigned short status = serial_port_in(port, SCxSR); @@ -2240,8 +2177,6 @@ static int sci_init_single(struct platform_device *dev, port->dev = &dev->dev; - sci_init_gpios(sci_port); - pm_runtime_enable(&dev->dev); } @@ -2298,8 +2233,6 @@ static int sci_init_single(struct platform_device *dev, static void sci_cleanup_single(struct sci_port *port) { - sci_free_gpios(port); - clk_put(port->iclk); clk_put(port->fclk); diff --git a/include/linux/serial_sci.h b/include/linux/serial_sci.h index af9834bc6771..e9c3021a37ae 100644 --- a/include/linux/serial_sci.h +++ b/include/linux/serial_sci.h @@ -69,17 +69,6 @@ enum { SCIx_MUX_IRQ = SCIx_NR_IRQS, /* special case */ }; -/* Offsets into the sci_port->gpios array */ -enum { - SCIx_SCK, - SCIx_RXD, - SCIx_TXD, - SCIx_CTS, - SCIx_RTS, - - SCIx_NR_FNS, -}; - enum { SCIx_PROBE_REGTYPE, @@ -141,7 +130,6 @@ struct plat_sci_port_ops { struct plat_sci_port { unsigned long mapbase; /* resource base */ unsigned int irqs[SCIx_NR_IRQS]; /* ERI, RXI, TXI, BRI */ - unsigned int gpios[SCIx_NR_FNS]; /* SCK, RXD, TXD, CTS, RTS */ unsigned int type; /* SCI / SCIF / IRDA / HSCIF */ upf_t flags; /* UPF_* flags */ unsigned long capabilities; /* Port features/capabilities */ -- cgit From ec09c5eb491834d4011c72538e58d8b7096076bd Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Fri, 6 Dec 2013 10:59:20 +0100 Subject: serial: sh-sci: Rework baud rate calculation Computing the baud rate register value requires knowledge of the hardware sampling rate. This information is currently encoded in a baud rate calculation algorithm ID passed through platform data. However, it can be derived from the port type directly in most cases. Compute the sampling rate internally in the driver if the baud rate calculation algorithm ID isn't specified, and allow platforms to override the sampling rate through platform data in special cases (this is only required for SCIFA ports on sh7723 and sh7724, the reason needs to be investigated). Signed-off-by: Laurent Pinchart Acked-by: Greg Kroah-Hartman Signed-off-by: Simon Horman --- drivers/tty/serial/sh-sci.c | 37 ++++++++++++++++++++++++++++++------- include/linux/serial_sci.h | 2 ++ 2 files changed, 32 insertions(+), 7 deletions(-) (limited to 'include/linux') diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index d5239d5ff98b..e4bf0e435af6 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -65,6 +65,7 @@ struct sci_port { struct plat_sci_port *cfg; int overrun_bit; unsigned int error_mask; + unsigned int sampling_rate; /* Break timer */ @@ -1750,10 +1751,13 @@ static void sci_shutdown(struct uart_port *port) sci_free_irq(s); } -static unsigned int sci_scbrr_calc(unsigned int algo_id, unsigned int bps, +static unsigned int sci_scbrr_calc(struct sci_port *s, unsigned int bps, unsigned long freq) { - switch (algo_id) { + if (s->sampling_rate) + return DIV_ROUND_CLOSEST(freq, s->sampling_rate * bps) - 1; + + switch (s->cfg->scbrr_algo_id) { case SCBRR_ALGO_1: return freq / (16 * bps); case SCBRR_ALGO_2: @@ -1843,12 +1847,11 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios, baud = uart_get_baud_rate(port, termios, old, 0, max_baud); if (likely(baud && port->uartclk)) { - if (s->cfg->scbrr_algo_id == SCBRR_ALGO_6) { + if (s->cfg->type == PORT_HSCIF) { sci_baud_calc_hscif(baud, port->uartclk, &t, &srr, &cks); } else { - t = sci_scbrr_calc(s->cfg->scbrr_algo_id, baud, - port->uartclk); + t = sci_scbrr_calc(s, baud, port->uartclk); for (cks = 0; t >= 256 && cks <= 3; cks++) t >>= 2; } @@ -2092,6 +2095,7 @@ static int sci_init_single(struct platform_device *dev, { struct uart_port *port = &sci_port->port; const struct resource *res; + unsigned int sampling_rate; unsigned int i; int ret; @@ -2143,28 +2147,47 @@ static int sci_init_single(struct platform_device *dev, case PORT_SCIFB: port->fifosize = 256; sci_port->overrun_bit = 9; + sampling_rate = 16; break; case PORT_HSCIF: port->fifosize = 128; + sampling_rate = 0; sci_port->overrun_bit = 0; break; case PORT_SCIFA: port->fifosize = 64; sci_port->overrun_bit = 9; + sampling_rate = 16; break; case PORT_SCIF: port->fifosize = 16; - if (p->regtype == SCIx_SH7705_SCIF_REGTYPE) + if (p->regtype == SCIx_SH7705_SCIF_REGTYPE) { sci_port->overrun_bit = 9; - else + sampling_rate = 16; + } else { sci_port->overrun_bit = 0; + sampling_rate = 32; + } break; default: port->fifosize = 1; sci_port->overrun_bit = 5; + sampling_rate = 32; break; } + /* Set the sampling rate if the baud rate calculation algorithm isn't + * specified. + */ + if (p->scbrr_algo_id == SCBRR_ALGO_NONE) { + /* SCIFA on sh7723 and sh7724 need a custom sampling rate that + * doesn't match the SoC datasheet, this should be investigated. + * Let platform data override the sampling rate for now. + */ + sci_port->sampling_rate = p->sampling_rate ? p->sampling_rate + : sampling_rate; + } + if (!early) { sci_port->iclk = clk_get(&dev->dev, "sci_ick"); if (IS_ERR(sci_port->iclk)) { diff --git a/include/linux/serial_sci.h b/include/linux/serial_sci.h index e9c3021a37ae..af414e1895a5 100644 --- a/include/linux/serial_sci.h +++ b/include/linux/serial_sci.h @@ -11,6 +11,7 @@ #define SCIx_NOT_SUPPORTED (-1) enum { + SCBRR_ALGO_NONE, /* Compute sampling rate in the driver */ SCBRR_ALGO_1, /* clk / (16 * bps) */ SCBRR_ALGO_2, /* DIV_ROUND_CLOSEST(clk, 32 * bps) - 1 */ SCBRR_ALGO_3, /* clk / (8 * bps) */ @@ -134,6 +135,7 @@ struct plat_sci_port { upf_t flags; /* UPF_* flags */ unsigned long capabilities; /* Port features/capabilities */ + unsigned int sampling_rate; unsigned int scbrr_algo_id; /* SCBRR calculation algo */ unsigned int scscr; /* SCSCR initialization */ -- cgit