linux_dsm_epyc7002/arch/arm/mach-omap2/serial.c
Tony Lindgren 8dd5ea72b0 ARM: OMAP2+: Change core_initcall levels to postcore_initcall
We want to be able to probe a few selected device drivers before hwmod
code populates the clocks in omap_hwmod_setup_all(). This allows us to
convert most of the clock drivers into regular device drivers.

We only need a few minimal clock drivers early for the system timers to
select between the 32KiHz clock and the high frequency oscillator.

With these changes, initializing the clock drivers can be just done at
core_initcall time with something like:

np = of_find_node_by_name(NULL, "plls");
if (np)
	of_platform_populate(np, NULL, NULL, NULL);

And then these clocks will be available for the interconnect code to use.

Having most of the clock drivers being regular device drivers allows
us to use the nice things like devm_* functions and dev_err and dev_dbg.
As an extra bonus, this also allows us to develop the clock drivers for
new SoCs as loadable modules initially for cases where we can boot up
the system based on the bootloader configured clocks.

To do this, let's change the core_initcalls to postcore_initcall under
mach-omap2.

Cc: Felipe Balbi <balbi@ti.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2015-12-03 11:38:09 -08:00

333 lines
8.9 KiB
C

/*
* 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 = 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);
}