867e9f8d10
commit2fd149645e
(ARM: OMAP2+: UART: Remove omap_uart_can_sleep and add pm_qos) removed the last usage of 'can_sleep' but did not remove the field. commit8612bd22f3
(ARM: OMAP2+: UART: Avoid console uart idling during bootup) removed the last non-trivial use of 'pdev'. So remove these fields and the one trivial use. Acked-by: Govindraj.R <govindraj.raja@ti.com> Signed-off-by: NeilBrown <neilb@suse.de> [khilman@ti.com: minor changelog edits] Signed-off-by: Kevin Hilman <khilman@ti.com>
428 lines
11 KiB
C
428 lines
11 KiB
C
/*
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* arch/arm/mach-omap2/serial.c
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*
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* OMAP2 serial support.
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*
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* Copyright (C) 2005-2008 Nokia Corporation
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* Author: Paul Mundt <paul.mundt@nokia.com>
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*
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* Major rework for PM support by Kevin Hilman
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*
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* Based off of arch/arm/mach-omap/omap1/serial.c
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*
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* Copyright (C) 2009 Texas Instruments
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* Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/pm_runtime.h>
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#include <linux/console.h>
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#include <plat/omap-serial.h>
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#include "common.h"
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#include <plat/board.h>
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#include <plat/dma.h>
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#include <plat/omap_hwmod.h>
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#include <plat/omap_device.h>
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#include <plat/omap-pm.h>
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#include "prm2xxx_3xxx.h"
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#include "pm.h"
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#include "cm2xxx_3xxx.h"
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#include "prm-regbits-34xx.h"
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#include "control.h"
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#include "mux.h"
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/*
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* NOTE: By default the serial auto_suspend timeout is disabled as it causes
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* lost characters over the serial ports. This means that the UART clocks will
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* stay on until power/autosuspend_delay is set for the uart from sysfs.
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* This also causes that any deeper omap sleep states are blocked.
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*/
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#define DEFAULT_AUTOSUSPEND_DELAY -1
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#define MAX_UART_HWMOD_NAME_LEN 16
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struct omap_uart_state {
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int num;
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struct list_head node;
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struct omap_hwmod *oh;
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};
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static LIST_HEAD(uart_list);
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static u8 num_uarts;
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static u8 console_uart_id = -1;
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static u8 no_console_suspend;
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static u8 uart_debug;
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#define DEFAULT_RXDMA_POLLRATE 1 /* RX DMA polling rate (us) */
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#define DEFAULT_RXDMA_BUFSIZE 4096 /* RX DMA buffer size */
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#define DEFAULT_RXDMA_TIMEOUT (3 * HZ)/* RX DMA timeout (jiffies) */
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static struct omap_uart_port_info omap_serial_default_info[] __initdata = {
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{
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.dma_enabled = false,
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.dma_rx_buf_size = DEFAULT_RXDMA_BUFSIZE,
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.dma_rx_poll_rate = DEFAULT_RXDMA_POLLRATE,
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.dma_rx_timeout = DEFAULT_RXDMA_TIMEOUT,
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.autosuspend_timeout = DEFAULT_AUTOSUSPEND_DELAY,
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},
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};
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#ifdef CONFIG_PM
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static void omap_uart_enable_wakeup(struct platform_device *pdev, bool enable)
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{
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struct omap_device *od = to_omap_device(pdev);
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if (!od)
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return;
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if (enable)
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omap_hwmod_enable_wakeup(od->hwmods[0]);
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else
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omap_hwmod_disable_wakeup(od->hwmods[0]);
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}
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/*
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* Errata i291: [UART]:Cannot Acknowledge Idle Requests
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* in Smartidle Mode When Configured for DMA Operations.
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* WA: configure uart in force idle mode.
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*/
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static void omap_uart_set_noidle(struct platform_device *pdev)
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{
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struct omap_device *od = to_omap_device(pdev);
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omap_hwmod_set_slave_idlemode(od->hwmods[0], HWMOD_IDLEMODE_NO);
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}
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static void omap_uart_set_smartidle(struct platform_device *pdev)
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{
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struct omap_device *od = to_omap_device(pdev);
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omap_hwmod_set_slave_idlemode(od->hwmods[0], HWMOD_IDLEMODE_SMART);
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}
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#else
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static void omap_uart_enable_wakeup(struct platform_device *pdev, bool enable)
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{}
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static void omap_uart_set_noidle(struct platform_device *pdev) {}
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static void omap_uart_set_smartidle(struct platform_device *pdev) {}
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#endif /* CONFIG_PM */
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#ifdef CONFIG_OMAP_MUX
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static struct omap_device_pad default_uart1_pads[] __initdata = {
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{
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.name = "uart1_cts.uart1_cts",
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.enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
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},
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{
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.name = "uart1_rts.uart1_rts",
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.enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
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},
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{
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.name = "uart1_tx.uart1_tx",
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.enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
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},
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{
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.name = "uart1_rx.uart1_rx",
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.flags = OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
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.enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
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.idle = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
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},
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};
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static struct omap_device_pad default_uart2_pads[] __initdata = {
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{
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.name = "uart2_cts.uart2_cts",
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.enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
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},
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{
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.name = "uart2_rts.uart2_rts",
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.enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
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},
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{
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.name = "uart2_tx.uart2_tx",
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.enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
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},
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{
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.name = "uart2_rx.uart2_rx",
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.flags = OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
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.enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
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.idle = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
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},
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};
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static struct omap_device_pad default_uart3_pads[] __initdata = {
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{
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.name = "uart3_cts_rctx.uart3_cts_rctx",
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.enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
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},
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{
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.name = "uart3_rts_sd.uart3_rts_sd",
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.enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
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},
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{
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.name = "uart3_tx_irtx.uart3_tx_irtx",
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.enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
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},
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{
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.name = "uart3_rx_irrx.uart3_rx_irrx",
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.flags = OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
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.enable = OMAP_PIN_INPUT | OMAP_MUX_MODE0,
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.idle = OMAP_PIN_INPUT | OMAP_MUX_MODE0,
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},
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};
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static struct omap_device_pad default_omap36xx_uart4_pads[] __initdata = {
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{
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.name = "gpmc_wait2.uart4_tx",
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.enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
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},
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{
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.name = "gpmc_wait3.uart4_rx",
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.flags = OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
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.enable = OMAP_PIN_INPUT | OMAP_MUX_MODE2,
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.idle = OMAP_PIN_INPUT | OMAP_MUX_MODE2,
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},
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};
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static struct omap_device_pad default_omap4_uart4_pads[] __initdata = {
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{
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.name = "uart4_tx.uart4_tx",
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.enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
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},
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{
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.name = "uart4_rx.uart4_rx",
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.flags = OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
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.enable = OMAP_PIN_INPUT | OMAP_MUX_MODE0,
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.idle = OMAP_PIN_INPUT | OMAP_MUX_MODE0,
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},
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};
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static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
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{
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switch (bdata->id) {
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case 0:
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bdata->pads = default_uart1_pads;
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bdata->pads_cnt = ARRAY_SIZE(default_uart1_pads);
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break;
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case 1:
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bdata->pads = default_uart2_pads;
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bdata->pads_cnt = ARRAY_SIZE(default_uart2_pads);
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break;
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case 2:
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bdata->pads = default_uart3_pads;
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bdata->pads_cnt = ARRAY_SIZE(default_uart3_pads);
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break;
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case 3:
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if (cpu_is_omap44xx()) {
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bdata->pads = default_omap4_uart4_pads;
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bdata->pads_cnt =
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ARRAY_SIZE(default_omap4_uart4_pads);
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} else if (cpu_is_omap3630()) {
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bdata->pads = default_omap36xx_uart4_pads;
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bdata->pads_cnt =
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ARRAY_SIZE(default_omap36xx_uart4_pads);
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}
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break;
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default:
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break;
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}
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}
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#else
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static void omap_serial_fill_default_pads(struct omap_board_data *bdata) {}
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#endif
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char *cmdline_find_option(char *str)
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{
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extern char *saved_command_line;
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return strstr(saved_command_line, str);
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}
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static int __init omap_serial_early_init(void)
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{
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do {
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char oh_name[MAX_UART_HWMOD_NAME_LEN];
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struct omap_hwmod *oh;
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struct omap_uart_state *uart;
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char uart_name[MAX_UART_HWMOD_NAME_LEN];
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snprintf(oh_name, MAX_UART_HWMOD_NAME_LEN,
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"uart%d", num_uarts + 1);
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oh = omap_hwmod_lookup(oh_name);
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if (!oh)
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break;
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uart = kzalloc(sizeof(struct omap_uart_state), GFP_KERNEL);
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if (WARN_ON(!uart))
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return -ENODEV;
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uart->oh = oh;
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uart->num = num_uarts++;
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list_add_tail(&uart->node, &uart_list);
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snprintf(uart_name, MAX_UART_HWMOD_NAME_LEN,
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"%s%d", OMAP_SERIAL_NAME, uart->num);
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if (cmdline_find_option(uart_name)) {
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console_uart_id = uart->num;
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if (console_loglevel >= 10) {
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uart_debug = true;
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pr_info("%s used as console in debug mode"
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" uart%d clocks will not be"
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" gated", uart_name, uart->num);
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}
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if (cmdline_find_option("no_console_suspend"))
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no_console_suspend = true;
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/*
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* omap-uart can be used for earlyprintk logs
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* So if omap-uart is used as console then prevent
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* uart reset and idle to get logs from omap-uart
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* until uart console driver is available to take
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* care for console messages.
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* Idling or resetting omap-uart while printing logs
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* early boot logs can stall the boot-up.
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*/
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oh->flags |= HWMOD_INIT_NO_IDLE | HWMOD_INIT_NO_RESET;
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}
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} while (1);
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return 0;
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}
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core_initcall(omap_serial_early_init);
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/**
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* omap_serial_init_port() - initialize single serial port
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* @bdata: port specific board data pointer
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* @info: platform specific data pointer
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*
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* This function initialies serial driver for given port only.
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* Platforms can call this function instead of omap_serial_init()
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* if they don't plan to use all available UARTs as serial ports.
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*
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* Don't mix calls to omap_serial_init_port() and omap_serial_init(),
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* use only one of the two.
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*/
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void __init omap_serial_init_port(struct omap_board_data *bdata,
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struct omap_uart_port_info *info)
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{
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struct omap_uart_state *uart;
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struct omap_hwmod *oh;
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struct platform_device *pdev;
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void *pdata = NULL;
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u32 pdata_size = 0;
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char *name;
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struct omap_uart_port_info omap_up;
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if (WARN_ON(!bdata))
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return;
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if (WARN_ON(bdata->id < 0))
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return;
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if (WARN_ON(bdata->id >= num_uarts))
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return;
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list_for_each_entry(uart, &uart_list, node)
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if (bdata->id == uart->num)
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break;
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if (!info)
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info = omap_serial_default_info;
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oh = uart->oh;
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name = DRIVER_NAME;
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omap_up.dma_enabled = info->dma_enabled;
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omap_up.uartclk = OMAP24XX_BASE_BAUD * 16;
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omap_up.flags = UPF_BOOT_AUTOCONF;
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omap_up.get_context_loss_count = omap_pm_get_dev_context_loss_count;
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omap_up.set_forceidle = omap_uart_set_smartidle;
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omap_up.set_noidle = omap_uart_set_noidle;
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omap_up.enable_wakeup = omap_uart_enable_wakeup;
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omap_up.dma_rx_buf_size = info->dma_rx_buf_size;
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omap_up.dma_rx_timeout = info->dma_rx_timeout;
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omap_up.dma_rx_poll_rate = info->dma_rx_poll_rate;
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omap_up.autosuspend_timeout = info->autosuspend_timeout;
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/* Enable the MDR1 Errata i202 for OMAP2430/3xxx/44xx */
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if (!cpu_is_omap2420() && !cpu_is_ti816x())
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omap_up.errata |= UART_ERRATA_i202_MDR1_ACCESS;
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/* Enable DMA Mode Force Idle Errata i291 for omap34xx/3630 */
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if (cpu_is_omap34xx() || cpu_is_omap3630())
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omap_up.errata |= UART_ERRATA_i291_DMA_FORCEIDLE;
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pdata = &omap_up;
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pdata_size = sizeof(struct omap_uart_port_info);
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if (WARN_ON(!oh))
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return;
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pdev = omap_device_build(name, uart->num, oh, pdata, pdata_size,
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NULL, 0, false);
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WARN(IS_ERR(pdev), "Could not build omap_device for %s: %s.\n",
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name, oh->name);
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if ((console_uart_id == bdata->id) && no_console_suspend)
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omap_device_disable_idle_on_suspend(pdev);
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oh->mux = omap_hwmod_mux_init(bdata->pads, bdata->pads_cnt);
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oh->dev_attr = uart;
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if (((cpu_is_omap34xx() || cpu_is_omap44xx()) && bdata->pads)
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&& !uart_debug)
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device_init_wakeup(&pdev->dev, true);
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}
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/**
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* omap_serial_board_init() - initialize all supported serial ports
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* @info: platform specific data pointer
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*
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* Initializes all available UARTs as serial ports. Platforms
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* can call this function when they want to have default behaviour
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* for serial ports (e.g initialize them all as serial ports).
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*/
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void __init omap_serial_board_init(struct omap_uart_port_info *info)
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{
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struct omap_uart_state *uart;
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struct omap_board_data bdata;
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list_for_each_entry(uart, &uart_list, node) {
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bdata.id = uart->num;
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bdata.flags = 0;
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bdata.pads = NULL;
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bdata.pads_cnt = 0;
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if (cpu_is_omap44xx() || cpu_is_omap34xx())
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omap_serial_fill_default_pads(&bdata);
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if (!info)
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omap_serial_init_port(&bdata, NULL);
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else
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omap_serial_init_port(&bdata, &info[uart->num]);
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}
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}
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/**
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* omap_serial_init() - initialize all supported serial ports
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*
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* Initializes all available UARTs.
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* Platforms can call this function when they want to have default behaviour
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* for serial ports (e.g initialize them all as serial ports).
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*/
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void __init omap_serial_init(void)
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{
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omap_serial_board_init(NULL);
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}
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