+++ /dev/null
-/*
- * arch/arm/mach-omap2/serial.c
- *
- * OMAP2 serial support.
- *
- * Copyright (C) 2005-2008 Nokia Corporation
- * Author: Paul Mundt <paul.mundt@nokia.com>
- *
- * Major rework for PM support by Kevin Hilman
- *
- * Based off of arch/arm/mach-omap/omap1/serial.c
- *
- * Copyright (C) 2009 Texas Instruments
- * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/clk.h>
-#include <linux/io.h>
-#include <linux/delay.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/pm_runtime.h>
-#include <linux/console.h>
-#include <linux/omap-dma.h>
-#include <linux/platform_data/serial-omap.h>
-
-#include "common.h"
-#include "omap_hwmod.h"
-#include "omap_device.h"
-#include "omap-pm.h"
-#include "soc.h"
-#include "prm2xxx_3xxx.h"
-#include "pm.h"
-#include "cm2xxx_3xxx.h"
-#include "prm-regbits-34xx.h"
-#include "control.h"
-#include "mux.h"
-#include "serial.h"
-
-/*
- * NOTE: By default the serial auto_suspend timeout is disabled as it causes
- * lost characters over the serial ports. This means that the UART clocks will
- * stay on until power/autosuspend_delay is set for the uart from sysfs.
- * This also causes that any deeper omap sleep states are blocked.
- */
-#define DEFAULT_AUTOSUSPEND_DELAY -1
-
-#define MAX_UART_HWMOD_NAME_LEN 16
-
-struct omap_uart_state {
- int num;
-
- struct list_head node;
- struct omap_hwmod *oh;
- struct omap_device_pad default_omap_uart_pads[2];
-};
-
-static LIST_HEAD(uart_list);
-static u8 num_uarts;
-static u8 console_uart_id = -1;
-static u8 uart_debug;
-
-#define DEFAULT_RXDMA_POLLRATE 1 /* RX DMA polling rate (us) */
-#define DEFAULT_RXDMA_BUFSIZE 4096 /* RX DMA buffer size */
-#define DEFAULT_RXDMA_TIMEOUT (3 * HZ)/* RX DMA timeout (jiffies) */
-
-static struct omap_uart_port_info omap_serial_default_info[] __initdata = {
- {
- .dma_enabled = false,
- .dma_rx_buf_size = DEFAULT_RXDMA_BUFSIZE,
- .dma_rx_poll_rate = DEFAULT_RXDMA_POLLRATE,
- .dma_rx_timeout = DEFAULT_RXDMA_TIMEOUT,
- .autosuspend_timeout = DEFAULT_AUTOSUSPEND_DELAY,
- },
-};
-
-#ifdef CONFIG_PM
-static void omap_uart_enable_wakeup(struct device *dev, bool enable)
-{
- struct platform_device *pdev = to_platform_device(dev);
- struct omap_device *od = to_omap_device(pdev);
-
- if (!od)
- return;
-
- if (enable)
- omap_hwmod_enable_wakeup(od->hwmods[0]);
- else
- omap_hwmod_disable_wakeup(od->hwmods[0]);
-}
-
-#else
-static void omap_uart_enable_wakeup(struct device *dev, bool enable)
-{}
-#endif /* CONFIG_PM */
-
-#ifdef CONFIG_OMAP_MUX
-
-#define OMAP_UART_DEFAULT_PAD_NAME_LEN 28
-static char rx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN],
- tx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN] __initdata;
-
-static void __init
-omap_serial_fill_uart_tx_rx_pads(struct omap_board_data *bdata,
- struct omap_uart_state *uart)
-{
- uart->default_omap_uart_pads[0].name = rx_pad_name;
- uart->default_omap_uart_pads[0].flags = OMAP_DEVICE_PAD_REMUX |
- OMAP_DEVICE_PAD_WAKEUP;
- uart->default_omap_uart_pads[0].enable = OMAP_PIN_INPUT |
- OMAP_MUX_MODE0;
- uart->default_omap_uart_pads[0].idle = OMAP_PIN_INPUT | OMAP_MUX_MODE0;
- uart->default_omap_uart_pads[1].name = tx_pad_name;
- uart->default_omap_uart_pads[1].enable = OMAP_PIN_OUTPUT |
- OMAP_MUX_MODE0;
- bdata->pads = uart->default_omap_uart_pads;
- bdata->pads_cnt = ARRAY_SIZE(uart->default_omap_uart_pads);
-}
-
-static void __init omap_serial_check_wakeup(struct omap_board_data *bdata,
- struct omap_uart_state *uart)
-{
- struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL;
- struct omap_mux *rx_mux = NULL, *tx_mux = NULL;
- char *rx_fmt, *tx_fmt;
- int uart_nr = bdata->id + 1;
-
- if (bdata->id != 2) {
- rx_fmt = "uart%d_rx.uart%d_rx";
- tx_fmt = "uart%d_tx.uart%d_tx";
- } else {
- rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx";
- tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx";
- }
-
- snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt,
- uart_nr, uart_nr);
- snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt,
- uart_nr, uart_nr);
-
- if (omap_mux_get_by_name(rx_pad_name, &rx_partition, &rx_mux) >= 0 &&
- omap_mux_get_by_name
- (tx_pad_name, &tx_partition, &tx_mux) >= 0) {
- u16 tx_mode, rx_mode;
-
- tx_mode = omap_mux_read(tx_partition, tx_mux->reg_offset);
- rx_mode = omap_mux_read(rx_partition, rx_mux->reg_offset);
-
- /*
- * Check if uart is used in default tx/rx mode i.e. in mux mode0
- * if yes then configure rx pin for wake up capability
- */
- if (OMAP_MODE_UART(rx_mode) && OMAP_MODE_UART(tx_mode))
- omap_serial_fill_uart_tx_rx_pads(bdata, uart);
- }
-}
-#else
-static void __init omap_serial_check_wakeup(struct omap_board_data *bdata,
- struct omap_uart_state *uart)
-{
-}
-#endif
-
-static char *cmdline_find_option(char *str)
-{
- extern char *saved_command_line;
-
- return strstr(saved_command_line, str);
-}
-
-static int __init omap_serial_early_init(void)
-{
- if (of_have_populated_dt())
- return -ENODEV;
-
- do {
- char oh_name[MAX_UART_HWMOD_NAME_LEN];
- struct omap_hwmod *oh;
- struct omap_uart_state *uart;
- char uart_name[MAX_UART_HWMOD_NAME_LEN];
-
- snprintf(oh_name, MAX_UART_HWMOD_NAME_LEN,
- "uart%d", num_uarts + 1);
- oh = omap_hwmod_lookup(oh_name);
- if (!oh)
- break;
-
- uart = kzalloc(sizeof(struct omap_uart_state), GFP_KERNEL);
- if (WARN_ON(!uart))
- return -ENODEV;
-
- uart->oh = oh;
- uart->num = num_uarts++;
- list_add_tail(&uart->node, &uart_list);
- snprintf(uart_name, MAX_UART_HWMOD_NAME_LEN,
- "%s%d", OMAP_SERIAL_NAME, uart->num);
-
- if (cmdline_find_option(uart_name)) {
- console_uart_id = uart->num;
-
- if (console_loglevel >= CONSOLE_LOGLEVEL_DEBUG) {
- uart_debug = true;
- pr_info("%s used as console in debug mode: uart%d clocks will not be gated",
- uart_name, uart->num);
- }
- }
- } while (1);
-
- return 0;
-}
-omap_postcore_initcall(omap_serial_early_init);
-
-/**
- * omap_serial_init_port() - initialize single serial port
- * @bdata: port specific board data pointer
- * @info: platform specific data pointer
- *
- * This function initialies serial driver for given port only.
- * Platforms can call this function instead of omap_serial_init()
- * if they don't plan to use all available UARTs as serial ports.
- *
- * Don't mix calls to omap_serial_init_port() and omap_serial_init(),
- * use only one of the two.
- */
-void __init omap_serial_init_port(struct omap_board_data *bdata,
- struct omap_uart_port_info *info)
-{
- struct omap_uart_state *uart;
- struct omap_hwmod *oh;
- struct platform_device *pdev;
- void *pdata = NULL;
- u32 pdata_size = 0;
- char *name;
- struct omap_uart_port_info omap_up;
-
- if (WARN_ON(!bdata))
- return;
- if (WARN_ON(bdata->id < 0))
- return;
- if (WARN_ON(bdata->id >= num_uarts))
- return;
-
- list_for_each_entry(uart, &uart_list, node)
- if (bdata->id == uart->num)
- break;
- if (!info)
- info = omap_serial_default_info;
-
- oh = uart->oh;
- name = OMAP_SERIAL_DRIVER_NAME;
-
- omap_up.dma_enabled = info->dma_enabled;
- omap_up.uartclk = OMAP24XX_BASE_BAUD * 16;
- omap_up.flags = UPF_BOOT_AUTOCONF;
- omap_up.get_context_loss_count = omap_pm_get_dev_context_loss_count;
- omap_up.enable_wakeup = omap_uart_enable_wakeup;
- omap_up.dma_rx_buf_size = info->dma_rx_buf_size;
- omap_up.dma_rx_timeout = info->dma_rx_timeout;
- omap_up.dma_rx_poll_rate = info->dma_rx_poll_rate;
- omap_up.autosuspend_timeout = info->autosuspend_timeout;
-
- pdata = &omap_up;
- pdata_size = sizeof(struct omap_uart_port_info);
-
- if (WARN_ON(!oh))
- return;
-
- pdev = omap_device_build(name, uart->num, oh, pdata, pdata_size);
- if (IS_ERR(pdev)) {
- WARN(1, "Could not build omap_device for %s: %s.\n", name,
- oh->name);
- return;
- }
-
- oh->mux = omap_hwmod_mux_init(bdata->pads, bdata->pads_cnt);
-
- if (console_uart_id == bdata->id) {
- omap_device_enable(pdev);
- pm_runtime_set_active(&pdev->dev);
- }
-
- oh->dev_attr = uart;
-
- if (((cpu_is_omap34xx() || cpu_is_omap44xx()) && bdata->pads)
- && !uart_debug)
- device_init_wakeup(&pdev->dev, true);
-}
-
-/**
- * omap_serial_board_init() - initialize all supported serial ports
- * @info: platform specific data pointer
- *
- * Initializes all available UARTs as serial ports. Platforms
- * can call this function when they want to have default behaviour
- * for serial ports (e.g initialize them all as serial ports).
- */
-void __init omap_serial_board_init(struct omap_uart_port_info *info)
-{
- struct omap_uart_state *uart;
- struct omap_board_data bdata;
-
- list_for_each_entry(uart, &uart_list, node) {
- bdata.id = uart->num;
- bdata.flags = 0;
- bdata.pads = NULL;
- bdata.pads_cnt = 0;
-
- omap_serial_check_wakeup(&bdata, uart);
-
- if (!info)
- omap_serial_init_port(&bdata, NULL);
- else
- omap_serial_init_port(&bdata, &info[uart->num]);
- }
-}
-
-/**
- * omap_serial_init() - initialize all supported serial ports
- *
- * Initializes all available UARTs.
- * Platforms can call this function when they want to have default behaviour
- * for serial ports (e.g initialize them all as serial ports).
- */
-void __init omap_serial_init(void)
-{
- omap_serial_board_init(NULL);
-}
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