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serial: 8250: Add new port type for TI DA8xx/66AK2x 

This adds a new UART port type for TI DA8xx/OMAPL13x/AM17xx/AM18xx/66AK2x.
These SoCs have standard 8250 registers plus some extra non-standard
registers.

The UART will not function unless the non-standard Power and Emulation
Management Register (PWREMU_MGMT) is configured correctly. This is
currently handled in arch/arm/mach-davinci/serial.c for non-device-tree
boards. Making this part of the UART driver will allow UART to work on
device-tree boards as well and the mach code can eventually be removed.

Signed-off-by: David Lechner <david@lechnology.com>
Acked-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Lechner 2017-01-05 12:54:18 -06:00 committed by Greg Kroah-Hartman
parent b2ae93e058
commit a2d6a987bf
4 changed files with 33 additions and 1 deletions
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1
drivers/tty/serial/8250/8250_of.c
View File

@ -332,6 +332,7 @@ static const struct of_device_id of_platform_serial_table[] = {
.data = (void *)PORT_ALTR_16550_F128, },
{ .compatible = "mrvl,mmp-uart",
.data = (void *)PORT_XSCALE, },
{ .compatible = "ti,da830-uart", .data = (void *)PORT_DA830, },
{ /* end of list */ },
};
MODULE_DEVICE_TABLE(of, of_platform_serial_table);

22
drivers/tty/serial/8250/8250_port.c
View File

@ -273,6 +273,15 @@ static const struct serial8250_config uart_config[] = {
.rxtrig_bytes = {1, 4, 8, 14},
.flags = UART_CAP_FIFO,
},
[PORT_DA830] = {
.name = "TI DA8xx/66AK2x",
.fifo_size = 16,
.tx_loadsz = 16,
.fcr = UART_FCR_DMA_SELECT | UART_FCR_ENABLE_FIFO |
UART_FCR_R_TRIG_10,
.rxtrig_bytes = {1, 4, 8, 14},
.flags = UART_CAP_FIFO | UART_CAP_AFE,
},
};
/* Uart divisor latch read */
@ -2114,6 +2123,19 @@ int serial8250_do_startup(struct uart_port *port)
serial_port_out(port, UART_LCR, 0);
}
if (port->type == PORT_DA830) {
/* Reset the port */
serial_port_out(port, UART_IER, 0);
serial_port_out(port, UART_DA830_PWREMU_MGMT, 0);
mdelay(10);
/* Enable Tx, Rx and free run mode */
serial_port_out(port, UART_DA830_PWREMU_MGMT,
UART_DA830_PWREMU_MGMT_UTRST |
UART_DA830_PWREMU_MGMT_URRST |
UART_DA830_PWREMU_MGMT_FREE);
}
#ifdef CONFIG_SERIAL_8250_RSA
/*
* If this is an RSA port, see if we can kick it up to the

3
include/uapi/linux/serial_core.h
View File

@ -56,7 +56,8 @@
#define PORT_ALTR_16550_F128 28 /* Altera 16550 UART with 128 FIFOs */
#define PORT_RT2880 29 /* Ralink RT2880 internal UART */
#define PORT_16550A_FSL64 30 /* Freescale 16550 UART with 64 FIFOs */
#define PORT_MAX_8250 30 /* max port ID */
#define PORT_DA830 31 /* TI DA8xx/66AK2x */
#define PORT_MAX_8250 31 /* max port ID */
/*
* ARM specific type numbers. These are not currently guaranteed

8
include/uapi/linux/serial_reg.h
View File

@ -327,6 +327,14 @@
#define SERIAL_RSA_BAUD_BASE (921600)
#define SERIAL_RSA_BAUD_BASE_LO (SERIAL_RSA_BAUD_BASE / 8)
/* Extra registers for TI DA8xx/66AK2x */
#define UART_DA830_PWREMU_MGMT 12
/* PWREMU_MGMT register bits */
#define UART_DA830_PWREMU_MGMT_FREE (1 << 0) /* Free-running mode */
#define UART_DA830_PWREMU_MGMT_URRST (1 << 13) /* Receiver reset/enable */
#define UART_DA830_PWREMU_MGMT_UTRST (1 << 14) /* Transmitter reset/enable */
/*
* Extra serial register definitions for the internal UARTs
* in TI OMAP processors.