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serial: support 16-bit register interface for console

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Currently, 8-bit (MMIO) and 32-bit (MMIO32) register interfaces are
supported for the 8250 console, but the 16-bit (MMIO16) is not.
The 8250 UART device on my board is connected to a 16-bit bus and
my main motivation is to use earlycon with it.
(Refer to arch/arm/boot/dts/uniphier-support-card.dtsi)

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Masahiro Yamada 2015-10-28 12:46:05 +09:00 committed by Greg Kroah-Hartman
parent 004e2ed5cc
commit bd94c4077a
9 changed files with 57 additions and 13 deletions
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9
Documentation/kernel-parameters.txt
View File

@ -721,16 +721,17 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
uart[8250],io,<addr>[,options]
uart[8250],mmio,<addr>[,options]
uart[8250],mmio16,<addr>[,options]
uart[8250],mmio32,<addr>[,options]
uart[8250],0x<addr>[,options]
Start an early, polled-mode console on the 8250/16550
UART at the specified I/O port or MMIO address,
switching to the matching ttyS device later.
MMIO inter-register address stride is either 8-bit
(mmio) or 32-bit (mmio32).
If none of [io|mmio|mmio32], <addr> is assumed to be
equivalent to 'mmio'. 'options' are specified in the
same format described for ttyS above; if unspecified,
(mmio), 16-bit (mmio16), or 32-bit (mmio32).
If none of [io|mmio|mmio16|mmio32], <addr> is assumed
to be equivalent to 'mmio'. 'options' are specified in
the same format described for ttyS above; if unspecified,
the h/w is not re-initialized.
hvc<n> Use the hypervisor console device <n>. This is for

7
drivers/tty/serial/8250/8250_core.c
View File

@ -620,7 +620,7 @@ static int univ8250_console_setup(struct console *co, char *options)
* @options: ptr to option string from console command line
*
* Only attempts to match console command lines of the form:
* console=uart[8250],io|mmio|mmio32,<addr>[,<options>]
* console=uart[8250],io|mmio|mmio16|mmio32,<addr>[,<options>]
* console=uart[8250],0x<addr>[,<options>]
* This form is used to register an initial earlycon boot console and
* replace it with the serial8250_console at 8250 driver init.
@ -650,8 +650,9 @@ static int univ8250_console_match(struct console *co, char *name, int idx,
if (port->iotype != iotype)
continue;
if ((iotype == UPIO_MEM || iotype == UPIO_MEM32) &&
(port->mapbase != addr))
if ((iotype == UPIO_MEM || iotype == UPIO_MEM16 ||
iotype == UPIO_MEM32 || iotype == UPIO_MEM32BE)
&& (port->mapbase != addr))
continue;
if (iotype == UPIO_PORT && port->iobase != addr)
continue;

5
drivers/tty/serial/8250/8250_early.c
View File

@ -42,6 +42,8 @@ static unsigned int __init serial8250_early_in(struct uart_port *port, int offse
switch (port->iotype) {
case UPIO_MEM:
return readb(port->membase + offset);
case UPIO_MEM16:
return readw(port->membase + (offset << 1));
case UPIO_MEM32:
return readl(port->membase + (offset << 2));
case UPIO_MEM32BE:
@ -59,6 +61,9 @@ static void __init serial8250_early_out(struct uart_port *port, int offset, int
case UPIO_MEM:
writeb(value, port->membase + offset);
break;
case UPIO_MEM16:
writew(value, port->membase + (offset << 1));
break;
case UPIO_MEM32:
writel(value, port->membase + (offset << 2));
break;

20
drivers/tty/serial/8250/8250_port.c
View File

@ -368,6 +368,18 @@ static void mem_serial_out(struct uart_port *p, int offset, int value)
writeb(value, p->membase + offset);
}
static void mem16_serial_out(struct uart_port *p, int offset, int value)
{
offset = offset << p->regshift;
writew(value, p->membase + offset);
}
static unsigned int mem16_serial_in(struct uart_port *p, int offset)
{
offset = offset << p->regshift;
return readw(p->membase + offset);
}
static void mem32_serial_out(struct uart_port *p, int offset, int value)
{
offset = offset << p->regshift;
@ -425,6 +437,11 @@ static void set_io_from_upio(struct uart_port *p)
p->serial_out = mem_serial_out;
break;
case UPIO_MEM16:
p->serial_in = mem16_serial_in;
p->serial_out = mem16_serial_out;
break;
case UPIO_MEM32:
p->serial_in = mem32_serial_in;
p->serial_out = mem32_serial_out;
@ -459,6 +476,7 @@ serial_port_out_sync(struct uart_port *p, int offset, int value)
{
switch (p->iotype) {
case UPIO_MEM:
case UPIO_MEM16:
case UPIO_MEM32:
case UPIO_MEM32BE:
case UPIO_AU:
@ -2462,6 +2480,7 @@ static int serial8250_request_std_resource(struct uart_8250_port *up)
case UPIO_TSI:
case UPIO_MEM32:
case UPIO_MEM32BE:
case UPIO_MEM16:
case UPIO_MEM:
if (!port->mapbase)
break;
@ -2499,6 +2518,7 @@ static void serial8250_release_std_resource(struct uart_8250_port *up)
case UPIO_TSI:
case UPIO_MEM32:
case UPIO_MEM32BE:
case UPIO_MEM16:
case UPIO_MEM:
if (!port->mapbase)
break;

15
drivers/tty/serial/earlycon.c
View File

@ -71,10 +71,16 @@ static int __init parse_options(struct earlycon_device *device, char *options)
return -EINVAL;
switch (port->iotype) {
case UPIO_MEM:
port->mapbase = addr;
break;
case UPIO_MEM16:
port->regshift = 1;
port->mapbase = addr;
break;
case UPIO_MEM32:
case UPIO_MEM32BE:
port->regshift = 2; /* fall-through */
case UPIO_MEM:
port->regshift = 2;
port->mapbase = addr;
break;
case UPIO_PORT:
@ -91,10 +97,11 @@ static int __init parse_options(struct earlycon_device *device, char *options)
strlcpy(device->options, options, length);
}
if (port->iotype == UPIO_MEM || port->iotype == UPIO_MEM32 ||
port->iotype == UPIO_MEM32BE)
if (port->iotype == UPIO_MEM || port->iotype == UPIO_MEM16 ||
port->iotype == UPIO_MEM32 || port->iotype == UPIO_MEM32BE)
pr_info("Early serial console at MMIO%s 0x%llx (options '%s')\n",
(port->iotype == UPIO_MEM) ? "" :
(port->iotype == UPIO_MEM16) ? "16" :
(port->iotype == UPIO_MEM32) ? "32" : "32be",
(unsigned long long)port->mapbase,
device->options);

3
drivers/tty/serial/of_serial.c
View File

@ -122,6 +122,9 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
case 1:
port->iotype = UPIO_MEM;
break;
case 2:
port->iotype = UPIO_MEM16;
break;
case 4:
port->iotype = of_device_is_big_endian(np) ?
UPIO_MEM32BE : UPIO_MEM32;

9
drivers/tty/serial/serial_core.c
View File

@ -1818,8 +1818,8 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co)
* @options: ptr for <options> field; NULL if not present (out)
*
* Decodes earlycon kernel command line parameters of the form
* earlycon=<name>,io|mmio|mmio32|mmio32be|mmio32native,<addr>,<options>
* console=<name>,io|mmio|mmio32|mmio32be|mmio32native,<addr>,<options>
* earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options>
* console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options>
*
* The optional form
* earlycon=<name>,0x<addr>,<options>
@ -1834,6 +1834,9 @@ int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
if (strncmp(p, "mmio,", 5) == 0) {
*iotype = UPIO_MEM;
p += 5;
} else if (strncmp(p, "mmio16,", 7) == 0) {
*iotype = UPIO_MEM16;
p += 7;
} else if (strncmp(p, "mmio32,", 7) == 0) {
*iotype = UPIO_MEM32;
p += 7;
@ -2186,6 +2189,7 @@ uart_report_port(struct uart_driver *drv, struct uart_port *port)
"I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
break;
case UPIO_MEM:
case UPIO_MEM16:
case UPIO_MEM32:
case UPIO_MEM32BE:
case UPIO_AU:
@ -2831,6 +2835,7 @@ int uart_match_port(struct uart_port *port1, struct uart_port *port2)
return (port1->iobase == port2->iobase) &&
(port1->hub6 == port2->hub6);
case UPIO_MEM:
case UPIO_MEM16:
case UPIO_MEM32:
case UPIO_MEM32BE:
case UPIO_AU:

1
include/linux/serial_core.h
View File

@ -150,6 +150,7 @@ struct uart_port {
#define UPIO_AU (SERIAL_IO_AU) /* Au1x00 and RT288x type IO */
#define UPIO_TSI (SERIAL_IO_TSI) /* Tsi108/109 type IO */
#define UPIO_MEM32BE (SERIAL_IO_MEM32BE) /* 32b big endian */
#define UPIO_MEM16 (SERIAL_IO_MEM16) /* 16b little endian */
unsigned int read_status_mask; /* driver specific */
unsigned int ignore_status_mask; /* driver specific */

1
include/uapi/linux/serial.h
View File

@ -69,6 +69,7 @@ struct serial_struct {
#define SERIAL_IO_AU 4
#define SERIAL_IO_TSI 5
#define SERIAL_IO_MEM32BE 6
#define SERIAL_IO_MEM16 7
#define UART_CLEAR_FIFO 0x01
#define UART_USE_FIFO 0x02