[PATCH 4/7] tty: serial: support device tree in pxa
Grant Likely
grant.likely at secretlab.ca
Tue Jul 19 15:40:10 EDT 2011
On Tue, Jul 19, 2011 at 10:24:47AM +0800, Haojian Zhuang wrote:
> Support both normal platform driver and device tree driver in serial pxa.
>
> Signed-off-by: Haojian Zhuang <haojian.zhuang at marvell.com>
> ---
> drivers/tty/serial/Kconfig | 4 +-
> drivers/tty/serial/of_serial.c | 12 +++++
> drivers/tty/serial/pxa.c | 93 ++++++++++++++++++++++++++++++++++++++-
> include/linux/serial_pxa.h | 17 +++++++
> 4 files changed, 122 insertions(+), 4 deletions(-)
> create mode 100644 include/linux/serial_pxa.h
>
serial_pxa is already a platform_driver. Instead of modifying
of_serial, an of_match_table should be added to this driver and it
should decode the DT data inside the existing probe hook.
No need to create all of this extra infrastructure.
g.
> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> index 636144c..3f75e0d 100644
> --- a/drivers/tty/serial/Kconfig
> +++ b/drivers/tty/serial/Kconfig
> @@ -663,6 +663,8 @@ config SERIAL_MPSC_CONSOLE
> config SERIAL_PXA
> bool "PXA serial port support"
> depends on ARCH_PXA || ARCH_MMP
> + select SERIAL_OF_PLATFORM
> + select SERIAL_CORE_CONSOLE
> select SERIAL_CORE
> help
> If you have a machine based on an Intel XScale PXA2xx CPU you
> @@ -1340,7 +1342,7 @@ config SERIAL_NETX_CONSOLE
> config SERIAL_OF_PLATFORM
> tristate "Serial port on Open Firmware platform bus"
> depends on OF
> - depends on SERIAL_8250 || SERIAL_OF_PLATFORM_NWPSERIAL
> + depends on SERIAL_8250 || SERIAL_OF_PLATFORM_NWPSERIAL || SERIAL_PXA
> help
> If you have a PowerPC based system that has serial ports
> on a platform specific bus, you should enable this option.
> diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
> index e65f1e8..83e07fb 100644
> --- a/drivers/tty/serial/of_serial.c
> +++ b/drivers/tty/serial/of_serial.c
> @@ -14,6 +14,7 @@
> #include <linux/slab.h>
> #include <linux/serial_core.h>
> #include <linux/serial_8250.h>
> +#include <linux/serial_pxa.h>
> #include <linux/of_address.h>
> #include <linux/of_irq.h>
> #include <linux/of_platform.h>
> @@ -126,6 +127,11 @@ static int __devinit of_platform_serial_probe(struct platform_device *ofdev)
> ret = nwpserial_register_port(&port);
> break;
> #endif
> +#ifdef CONFIG_SERIAL_PXA
> + case PORT_PXA:
> + ret = serial_pxa_register_port(&port);
> + break;
> +#endif
> default:
> /* need to add code for these */
> case PORT_UNKNOWN:
> @@ -163,6 +169,11 @@ static int of_platform_serial_remove(struct platform_device *ofdev)
> nwpserial_unregister_port(info->line);
> break;
> #endif
> +#ifdef CONFIG_SERIAL_PXA
> + case PORT_PXA:
> + serial_pxa_unregister_port(info->line);
> + break;
> +#endif
> default:
> /* need to add code for these */
> break;
> @@ -186,6 +197,7 @@ static struct of_device_id __devinitdata of_platform_serial_table[] = {
> { .compatible = "ibm,qpace-nwp-serial",
> .data = (void *)PORT_NWPSERIAL, },
> #endif
> + { .compatible = "mrvl,pxa270-serial", .data = (void *)PORT_PXA, },
> { .type = "serial", .data = (void *)PORT_UNKNOWN, },
> { /* end of list */ },
> };
> diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
> index 4302e6e..8f4d538 100644
> --- a/drivers/tty/serial/pxa.c
> +++ b/drivers/tty/serial/pxa.c
> @@ -36,10 +36,12 @@
> #include <linux/circ_buf.h>
> #include <linux/delay.h>
> #include <linux/interrupt.h>
> +#include <linux/of.h>
> #include <linux/platform_device.h>
> #include <linux/tty.h>
> #include <linux/tty_flip.h>
> #include <linux/serial_core.h>
> +#include <linux/serial_pxa.h>
> #include <linux/clk.h>
> #include <linux/io.h>
> #include <linux/slab.h>
> @@ -54,6 +56,10 @@ struct uart_pxa_port {
> char *name;
> };
>
> +#define PXA_SERIAL_NR 4
> +
> +static DEFINE_MUTEX(serial_pxa_mutex);
> +
> static inline unsigned int serial_in(struct uart_pxa_port *up, int offset)
> {
> offset <<= 2;
> @@ -346,8 +352,6 @@ static int serial_pxa_startup(struct uart_port *port)
> else
> up->mcr = 0;
>
> - up->port.uartclk = clk_get_rate(up->clk);
> -
> /*
> * Allocate the IRQ
> */
> @@ -593,7 +597,7 @@ serial_pxa_type(struct uart_port *port)
> return up->name;
> }
>
> -static struct uart_pxa_port *serial_pxa_ports[4];
> +static struct uart_pxa_port *serial_pxa_ports[PXA_SERIAL_NR];
> static struct uart_driver serial_pxa_reg;
>
> #ifdef CONFIG_SERIAL_PXA_CONSOLE
> @@ -761,6 +765,89 @@ static const struct dev_pm_ops serial_pxa_pm_ops = {
> };
> #endif
>
> +static int serial_pxa_port_size(struct uart_pxa_port *sport)
> +{
> + return 8 << sport->port.regshift;
> +}
> +
> +int serial_pxa_register_port(struct uart_port *port)
> +{
> + struct uart_pxa_port *sport = NULL;
> + char name[32];
> + int i, ret;
> +
> + mutex_lock(&serial_pxa_mutex);
> + for (i = 0; i < PXA_SERIAL_NR; i++) {
> + if (serial_pxa_ports[i] != NULL)
> + continue;
> + sport = kzalloc(sizeof(struct uart_pxa_port), GFP_KERNEL);
> + if (!sport) {
> + ret = -ENOMEM;
> + goto out;
> + }
> + switch (i) {
> + case 0: sport->name = "FFUART"; break;
> + case 1: sport->name = "BTUART"; break;
> + case 2: sport->name = "STUART"; break;
> + case 3: sport->name = "HWUART"; break;
> + default:
> + sport->name = "???";
> + break;
> + }
> + break;
> + }
> + if (i >= PXA_SERIAL_NR) {
> + pr_warn("can't find pxa serial port\n");
> + ret = -ENODEV;
> + goto out;
> + }
> +
> + sprintf(name, "pxa2xx-uart.%d", i);
> + sport->clk = clk_get_sys(name, NULL);
> + if (IS_ERR(sport->clk)) {
> + ret = PTR_ERR(sport->clk);
> + goto out_clk;
> + }
> + memcpy(&sport->port, port, sizeof(struct uart_port));
> + sport->port.line = i;
> + sport->port.fifosize = 64;
> + sport->port.ops = &serial_pxa_pops;
> +
> + sport->port.membase = ioremap(sport->port.mapbase,
> + serial_pxa_port_size(sport));
> + if (!sport->port.membase) {
> + ret = -ENOMEM;
> + goto out_membase;
> + }
> +
> + serial_pxa_ports[i] = sport;
> +
> + uart_add_one_port(&serial_pxa_reg, &sport->port);
> + mutex_unlock(&serial_pxa_mutex);
> +
> + return sport->port.line;
> +
> +out_membase:
> + clk_put(sport->clk);
> +out_clk:
> + kfree(sport);
> +out:
> + mutex_unlock(&serial_pxa_mutex);
> + return ret;
> +}
> +EXPORT_SYMBOL(serial_pxa_register_port);
> +
> +void serial_pxa_unregister_port(int line)
> +{
> + struct uart_pxa_port *sport = serial_pxa_ports[line];
> +
> + mutex_lock(&serial_pxa_mutex);
> + uart_remove_one_port(&serial_pxa_reg, &sport->port);
> + sport->port.type = PORT_UNKNOWN;
> + clk_put(sport->clk);
> + mutex_unlock(&serial_pxa_mutex);
> +}
> +
> static int serial_pxa_probe(struct platform_device *dev)
> {
> struct uart_pxa_port *sport;
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