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serial: 8250_dw: Support clk framework also with ACPI

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The Lynxpoint LPSS peripheral clocks are now handled in clk
framework so the drivers do not need to take care of them
manually. In dw8250_probe_acpi(), the uartclk is now taken
from the driver_data only if it was not already set.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2013-04-10 16:58:29 +03:00 committed by Greg Kroah-Hartman
parent ffc3ae6dd9
commit aea02e87f6
1 changed files with 5 additions and 13 deletions
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18
drivers/tty/serial/8250/8250_dw.c
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@ -36,9 +36,6 @@
#define DW_UART_CPR 0xf4 /* Component Parameter Register */
#define DW_UART_UCV 0xf8 /* UART Component Version */
/* Intel Low Power Subsystem specific */
#define LPSS_PRV_CLOCK_PARAMS 0x800
/* Component Parameter Register bits */
#define DW_UART_CPR_ABP_DATA_WIDTH (3 << 0)
#define DW_UART_CPR_AFCE_MODE (1 << 4)
@ -226,7 +223,6 @@ static int dw8250_probe_acpi(struct uart_port *p)
{
const struct acpi_device_id *id;
acpi_status status;
u32 reg;
id = acpi_match_device(p->dev->driver->acpi_match_table, p->dev);
if (!id)
@ -236,7 +232,9 @@ static int dw8250_probe_acpi(struct uart_port *p)
p->serial_in = dw8250_serial_in32;
p->serial_out = dw8250_serial_out32;
p->regshift = 2;
p->uartclk = (unsigned int)id->driver_data;
if (!p->uartclk)
p->uartclk = (unsigned int)id->driver_data;
status = acpi_walk_resources(ACPI_HANDLE(p->dev), METHOD_NAME__CRS,
dw8250_acpi_walk_resource, p);
@ -246,12 +244,6 @@ static int dw8250_probe_acpi(struct uart_port *p)
return -ENODEV;
}
/* Fix Haswell issue where the clocks do not get enabled */
if (!strcmp(id->id, "INT33C4") || !strcmp(id->id, "INT33C5")) {
reg = readl(p->membase + LPSS_PRV_CLOCK_PARAMS);
writel(reg | 1, p->membase + LPSS_PRV_CLOCK_PARAMS);
}
return 0;
}
#else
@ -425,8 +417,8 @@ static const struct of_device_id dw8250_of_match[] = {
MODULE_DEVICE_TABLE(of, dw8250_of_match);
static const struct acpi_device_id dw8250_acpi_match[] = {
{ "INT33C4", 100000000 },
{ "INT33C5", 100000000 },
{ "INT33C4", 0 },
{ "INT33C5", 0 },
{ },
};
MODULE_DEVICE_TABLE(acpi, dw8250_acpi_match);