#undef DEBUG
-#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/console.h>
+#include <linux/ctype.h>
+#include <linux/cpufreq.h>
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
#include <linux/errno.h>
-#include <linux/sh_dma.h>
-#include <linux/timer.h>
+#include <linux/init.h>
#include <linux/interrupt.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/serial.h>
-#include <linux/major.h>
-#include <linux/string.h>
-#include <linux/sysrq.h>
#include <linux/ioport.h>
+#include <linux/major.h>
+#include <linux/module.h>
#include <linux/mm.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/console.h>
-#include <linux/platform_device.h>
-#include <linux/serial_sci.h>
#include <linux/notifier.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
-#include <linux/cpufreq.h>
-#include <linux/clk.h>
-#include <linux/ctype.h>
-#include <linux/err.h>
-#include <linux/dmaengine.h>
-#include <linux/dma-mapping.h>
#include <linux/scatterlist.h>
+#include <linux/serial.h>
+#include <linux/serial_sci.h>
+#include <linux/sh_dma.h>
#include <linux/slab.h>
-#include <linux/gpio.h>
+#include <linux/string.h>
+#include <linux/sysrq.h>
+#include <linux/timer.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
#ifdef CONFIG_SUPERH
#include <asm/sh_bios.h>
#include "sh-sci.h"
+/* Offsets into the sci_port->irqs array */
+enum {
+ SCIx_ERI_IRQ,
+ SCIx_RXI_IRQ,
+ SCIx_TXI_IRQ,
+ SCIx_BRI_IRQ,
+ SCIx_NR_IRQS,
+
+ SCIx_MUX_IRQ = SCIx_NR_IRQS, /* special case */
+};
+
+#define SCIx_IRQ_IS_MUXED(port) \
+ ((port)->irqs[SCIx_ERI_IRQ] == \
+ (port)->irqs[SCIx_RXI_IRQ]) || \
+ ((port)->irqs[SCIx_ERI_IRQ] && \
+ ((port)->irqs[SCIx_RXI_IRQ] < 0))
+
struct sci_port {
struct uart_port port;
/* Platform configuration */
struct plat_sci_port *cfg;
+ int overrun_bit;
+ unsigned int error_mask;
+ unsigned int sampling_rate;
+
/* Break timer */
struct timer_list break_timer;
/* Function clock */
struct clk *fclk;
+ 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;
pm_runtime_get_sync(sci_port->port.dev);
- clk_enable(sci_port->iclk);
+ clk_prepare_enable(sci_port->iclk);
sci_port->port.uartclk = clk_get_rate(sci_port->iclk);
- clk_enable(sci_port->fclk);
+ clk_prepare_enable(sci_port->fclk);
}
static void sci_port_disable(struct sci_port *sci_port)
if (!sci_port->port.dev)
return;
- clk_disable(sci_port->fclk);
- clk_disable(sci_port->iclk);
+ /* Cancel the break timer to ensure that the timer handler will not try
+ * to access the hardware with clocks and power disabled. Reset the
+ * break flag to make the break debouncing state machine ready for the
+ * next break.
+ */
+ del_timer_sync(&sci_port->break_timer);
+ sci_port->break_flag = 0;
+
+ clk_disable_unprepare(sci_port->fclk);
+ clk_disable_unprepare(sci_port->iclk);
pm_runtime_put_sync(sci_port->port.dev);
}
return 1;
/* Cast for ARM damage */
- return !!__raw_readb((void __iomem *)s->cfg->port_reg);
+ return !!__raw_readb((void __iomem *)(uintptr_t)s->cfg->port_reg);
}
/* ********************************************************************** *
{
struct sci_port *port = (struct sci_port *)data;
- sci_port_enable(port);
-
if (sci_rxd_in(&port->port) == 0) {
port->break_flag = 1;
sci_schedule_break_timer(port);
sci_schedule_break_timer(port);
} else
port->break_flag = 0;
-
- sci_port_disable(port);
}
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)) {
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++;
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;
}
out_noirq:
while (--i >= 0)
- free_irq(port->cfg->irqs[i], port);
+ free_irq(port->irqs[i], port);
out_nomem:
while (--j >= 0)
* 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)) {
}
}
-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);
}
if (room < count)
- dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
+ dev_warn(port->dev, "Rx overrun: dropping %zu bytes\n",
count - room);
if (!room)
return room;
int count;
chan->device->device_control(chan, DMA_TERMINATE_ALL, 0);
- dev_dbg(port->dev, "Read %u bytes with cookie %d\n",
+ dev_dbg(port->dev, "Read %zu bytes with cookie %d\n",
sh_desc->partial, sh_desc->cookie);
spin_lock_irqsave(&port->lock, flags);
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");
s->chan_tx = chan;
sg_init_table(&s->sg_tx, 1);
/* UART circular tx buffer is an aligned page. */
- BUG_ON((int)port->state->xmit.buf & ~PAGE_MASK);
+ BUG_ON((uintptr_t)port->state->xmit.buf & ~PAGE_MASK);
sg_set_page(&s->sg_tx, virt_to_page(port->state->xmit.buf),
- UART_XMIT_SIZE, (int)port->state->xmit.buf & ~PAGE_MASK);
+ UART_XMIT_SIZE,
+ (uintptr_t)port->state->xmit.buf & ~PAGE_MASK);
nent = dma_map_sg(port->dev, &s->sg_tx, 1, DMA_TO_DEVICE);
if (!nent)
sci_tx_dma_release(s, false);
else
- dev_dbg(port->dev, "%s: mapped %d@%p to %x\n", __func__,
- sg_dma_len(&s->sg_tx),
- port->state->xmit.buf, sg_dma_address(&s->sg_tx));
+ dev_dbg(port->dev, "%s: mapped %d@%p to %pad\n", __func__,
+ sg_dma_len(&s->sg_tx), port->state->xmit.buf,
+ &sg_dma_address(&s->sg_tx));
s->sg_len_tx = nent;
sg_init_table(sg, 1);
sg_set_page(sg, virt_to_page(buf[i]), s->buf_len_rx,
- (int)buf[i] & ~PAGE_MASK);
+ (uintptr_t)buf[i] & ~PAGE_MASK);
sg_dma_address(sg) = dma[i];
}
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) {
- case SCBRR_ALGO_1:
- return ((freq + 16 * bps) / (16 * bps) - 1);
- case SCBRR_ALGO_2:
- return ((freq + 16 * bps) / (32 * bps) - 1);
- case SCBRR_ALGO_3:
- return (((freq * 2) + 16 * bps) / (16 * bps) - 1);
- case SCBRR_ALGO_4:
- return (((freq * 2) + 16 * bps) / (32 * bps) - 1);
- case SCBRR_ALGO_5:
- return (((freq * 1000 / 32) / bps) - 1);
- }
+ if (s->sampling_rate)
+ return DIV_ROUND_CLOSEST(freq, s->sampling_rate * bps) - 1;
/* Warn, but use a safe default */
WARN_ON(1);
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;
}
static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
{
- struct sci_port *s = to_sci_port(port);
-
- if (ser->irq != s->cfg->irqs[SCIx_TXI_IRQ] || ser->irq > nr_irqs)
- return -EINVAL;
if (ser->baud_base < 2400)
/* No paper tape reader for Mitch.. */
return -EINVAL;
};
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 sampling_rate;
+ unsigned int i;
int ret;
sci_port->cfg = p;
port->iotype = UPIO_MEM;
port->line = index;
+ 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];
+ }
+
+ if (p->regtype == SCIx_PROBE_REGTYPE) {
+ ret = sci_probe_regmap(p);
+ if (unlikely(ret))
+ return ret;
+ }
+
switch (p->type) {
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) {
+ sci_port->overrun_bit = 9;
+ 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;
}
- if (p->regtype == SCIx_PROBE_REGTYPE) {
- ret = sci_probe_regmap(p);
- if (unlikely(ret))
- return ret;
- }
+ /* 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 (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");
port->dev = &dev->dev;
- sci_init_gpios(sci_port);
-
pm_runtime_enable(&dev->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;
- /*
- * 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->mapbase = p->mapbase;
port->type = p->type;
- port->flags = p->flags;
+ port->flags = UPF_FIXED_PORT | p->flags;
port->regshift = p->regshift;
/*
*
* 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;
static void sci_cleanup_single(struct sci_port *port)
{
- sci_free_gpios(port);
-
clk_put(port->iclk);
clk_put(port->fclk);
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);
return 0;
}
+struct sci_port_info {
+ unsigned int type;
+ unsigned int regtype;
+};
+
+static const struct of_device_id of_sci_match[] = {
+ {
+ .compatible = "renesas,scif",
+ .data = (void *)&(const struct sci_port_info) {
+ .type = PORT_SCIF,
+ .regtype = SCIx_SH4_SCIF_REGTYPE,
+ },
+ }, {
+ .compatible = "renesas,scifa",
+ .data = (void *)&(const struct sci_port_info) {
+ .type = PORT_SCIFA,
+ .regtype = SCIx_SCIFA_REGTYPE,
+ },
+ }, {
+ .compatible = "renesas,scifb",
+ .data = (void *)&(const struct sci_port_info) {
+ .type = PORT_SCIFB,
+ .regtype = SCIx_SCIFB_REGTYPE,
+ },
+ }, {
+ .compatible = "renesas,hscif",
+ .data = (void *)&(const struct sci_port_info) {
+ .type = PORT_HSCIF,
+ .regtype = SCIx_HSCIF_REGTYPE,
+ },
+ }, {
+ /* Terminator */
+ },
+};
+MODULE_DEVICE_TABLE(of, of_sci_match);
+
+static struct plat_sci_port *
+sci_parse_dt(struct platform_device *pdev, unsigned int *dev_id)
+{
+ struct device_node *np = pdev->dev.of_node;
+ const struct of_device_id *match;
+ const struct sci_port_info *info;
+ struct plat_sci_port *p;
+ int id;
+
+ if (!IS_ENABLED(CONFIG_OF) || !np)
+ return NULL;
+
+ match = of_match_node(of_sci_match, pdev->dev.of_node);
+ if (!match)
+ return NULL;
+
+ info = match->data;
+
+ p = devm_kzalloc(&pdev->dev, sizeof(struct plat_sci_port), GFP_KERNEL);
+ if (!p) {
+ dev_err(&pdev->dev, "failed to allocate DT config data\n");
+ return NULL;
+ }
+
+ /* Get the line number for the aliases node. */
+ id = of_alias_get_id(np, "serial");
+ if (id < 0) {
+ dev_err(&pdev->dev, "failed to get alias id (%d)\n", id);
+ return NULL;
+ }
+
+ *dev_id = id;
+
+ p->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
+ p->type = info->type;
+ p->regtype = info->regtype;
+ p->scscr = SCSCR_RE | SCSCR_TE;
+
+ return p;
+}
+
static int sci_probe_single(struct platform_device *dev,
unsigned int index,
struct plat_sci_port *p,
return -EINVAL;
}
- ret = sci_init_single(dev, sciport, index, p);
+ ret = sci_init_single(dev, sciport, index, p, false);
if (ret)
return ret;
static int sci_probe(struct platform_device *dev)
{
- struct plat_sci_port *p = dev_get_platdata(&dev->dev);
- struct sci_port *sp = &sci_ports[dev->id];
+ struct plat_sci_port *p;
+ struct sci_port *sp;
+ unsigned int dev_id;
int ret;
/*
if (is_early_platform_device(dev))
return sci_probe_earlyprintk(dev);
+ if (dev->dev.of_node) {
+ p = sci_parse_dt(dev, &dev_id);
+ if (p == NULL)
+ return -EINVAL;
+ } else {
+ p = dev->dev.platform_data;
+ if (p == NULL) {
+ dev_err(&dev->dev, "no platform data supplied\n");
+ return -EINVAL;
+ }
+
+ dev_id = dev->id;
+ }
+
+ sp = &sci_ports[dev_id];
platform_set_drvdata(dev, sp);
- ret = sci_probe_single(dev, dev->id, p, sp);
+ ret = sci_probe_single(dev, dev_id, p, sp);
if (ret)
return ret;
.name = "sh-sci",
.owner = THIS_MODULE,
.pm = &sci_dev_pm_ops,
+ .of_match_table = of_match_ptr(of_sci_match),
},
};
projects / ~andy / linux / blobdiff