linux/arch/arm/mach-omap1/serial.c
Arnd Bergmann 0b47a62ea6 This removes all usage of global GPIO numbers from
arch/arm/mach-omap[12].
 
 The patches have been reviewed and tested by everyone
 who showed interest which was one person that tested
 on OSK1 and Nokia 770, and we smoked out the bugs and
 also addressed all review comments.
 
 Any remaining problems can certainly be fixed in-tree.
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Merge tag 'gpio-omap-descriptors-v6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio into soc/arm

This removes all usage of global GPIO numbers from
arch/arm/mach-omap[12].

The patches have been reviewed and tested by everyone
who showed interest which was one person that tested
on OSK1 and Nokia 770, and we smoked out the bugs and
also addressed all review comments.

Any remaining problems can certainly be fixed in-tree.

* tag 'gpio-omap-descriptors-v6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  ARM/musb: omap2: Remove global GPIO numbers from TUSB6010
  ARM: omap2: Rewrite WLAN quirk to use GPIO descriptors
  ARM: omap2: Get USB hub reset GPIO from descriptor
  ARM/gpio: Push OMAP2 quirk down into TWL4030 driver
  ARM: omap1: Exorcise the legacy GPIO header
  ARM: omap1: Make serial wakeup GPIOs use descriptors
  ARM: omap1: Fix up the Nokia 770 board device IRQs
  ARM/mmc: Convert old mmci-omap to GPIO descriptors
  Input: ads7846 - Convert to use software nodes
  ARM: omap1: Remove reliance on GPIO numbers from SX1
  ARM: omap1: Remove reliance on GPIO numbers from PalmTE
  ARM: omap1: Drop header on AMS Delta
  ARM/mfd/gpio: Fixup TPS65010 regression on OMAP1 OSK1

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2023-05-26 15:53:46 +02:00

247 lines
5.6 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/arch/arm/mach-omap1/serial.c
*
* OMAP1 serial support.
*/
#include <linux/gpio/machine.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/serial_8250.h>
#include <linux/serial_reg.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <asm/mach-types.h>
#include "common.h"
#include "serial.h"
#include "mux.h"
#include "pm.h"
#include "soc.h"
static struct clk * uart1_ck;
static struct clk * uart2_ck;
static struct clk * uart3_ck;
static inline unsigned int omap_serial_in(struct plat_serial8250_port *up,
int offset)
{
offset <<= up->regshift;
return (unsigned int)__raw_readb(up->membase + offset);
}
static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset,
int value)
{
offset <<= p->regshift;
__raw_writeb(value, p->membase + offset);
}
/*
* Internal UARTs need to be initialized for the 8250 autoconfig to work
* properly. Note that the TX watermark initialization may not be needed
* once the 8250.c watermark handling code is merged.
*/
static void __init omap_serial_reset(struct plat_serial8250_port *p)
{
omap_serial_outp(p, UART_OMAP_MDR1,
UART_OMAP_MDR1_DISABLE); /* disable UART */
omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */
omap_serial_outp(p, UART_OMAP_MDR1,
UART_OMAP_MDR1_16X_MODE); /* enable UART */
if (!cpu_is_omap15xx()) {
omap_serial_outp(p, UART_OMAP_SYSC, 0x01);
while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01));
}
}
static struct plat_serial8250_port serial_platform_data[] = {
{
.mapbase = OMAP1_UART1_BASE,
.irq = INT_UART1,
.flags = UPF_BOOT_AUTOCONF,
.iotype = UPIO_MEM,
.regshift = 2,
.uartclk = OMAP16XX_BASE_BAUD * 16,
},
{
.mapbase = OMAP1_UART2_BASE,
.irq = INT_UART2,
.flags = UPF_BOOT_AUTOCONF,
.iotype = UPIO_MEM,
.regshift = 2,
.uartclk = OMAP16XX_BASE_BAUD * 16,
},
{
.mapbase = OMAP1_UART3_BASE,
.irq = INT_UART3,
.flags = UPF_BOOT_AUTOCONF,
.iotype = UPIO_MEM,
.regshift = 2,
.uartclk = OMAP16XX_BASE_BAUD * 16,
},
{ },
};
static struct platform_device serial_device = {
.name = "serial8250",
.id = PLAT8250_DEV_PLATFORM,
.dev = {
.platform_data = serial_platform_data,
},
};
/*
* Note that on Innovator-1510 UART2 pins conflict with USB2.
* By default UART2 does not work on Innovator-1510 if you have
* USB OHCI enabled. To use UART2, you must disable USB2 first.
*/
void __init omap_serial_init(void)
{
int i;
if (cpu_is_omap15xx()) {
serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16;
serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16;
serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16;
}
for (i = 0; i < ARRAY_SIZE(serial_platform_data) - 1; i++) {
/* Static mapping, never released */
serial_platform_data[i].membase =
ioremap(serial_platform_data[i].mapbase, SZ_2K);
if (!serial_platform_data[i].membase) {
printk(KERN_ERR "Could not ioremap uart%i\n", i);
continue;
}
switch (i) {
case 0:
uart1_ck = clk_get(NULL, "uart1_ck");
if (IS_ERR(uart1_ck))
printk("Could not get uart1_ck\n");
else {
clk_prepare_enable(uart1_ck);
if (cpu_is_omap15xx())
clk_set_rate(uart1_ck, 12000000);
}
break;
case 1:
uart2_ck = clk_get(NULL, "uart2_ck");
if (IS_ERR(uart2_ck))
printk("Could not get uart2_ck\n");
else {
clk_prepare_enable(uart2_ck);
if (cpu_is_omap15xx())
clk_set_rate(uart2_ck, 12000000);
else
clk_set_rate(uart2_ck, 48000000);
}
break;
case 2:
uart3_ck = clk_get(NULL, "uart3_ck");
if (IS_ERR(uart3_ck))
printk("Could not get uart3_ck\n");
else {
clk_prepare_enable(uart3_ck);
if (cpu_is_omap15xx())
clk_set_rate(uart3_ck, 12000000);
}
break;
}
omap_serial_reset(&serial_platform_data[i]);
}
}
#ifdef CONFIG_OMAP_SERIAL_WAKE
static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id)
{
/* Need to do something with serial port right after wake-up? */
return IRQ_HANDLED;
}
/*
* Reroutes serial RX lines to GPIO lines for the duration of
* sleep to allow waking up the device from serial port even
* in deep sleep.
*/
void omap_serial_wake_trigger(int enable)
{
if (!cpu_is_omap16xx())
return;
if (uart1_ck != NULL) {
if (enable)
omap_cfg_reg(V14_16XX_GPIO37);
else
omap_cfg_reg(V14_16XX_UART1_RX);
}
if (uart2_ck != NULL) {
if (enable)
omap_cfg_reg(R9_16XX_GPIO18);
else
omap_cfg_reg(R9_16XX_UART2_RX);
}
if (uart3_ck != NULL) {
if (enable)
omap_cfg_reg(L14_16XX_GPIO49);
else
omap_cfg_reg(L14_16XX_UART3_RX);
}
}
static void __init omap_serial_set_port_wakeup(int idx)
{
struct gpio_desc *d;
int ret;
d = gpiod_get_index(NULL, "wakeup", idx, GPIOD_IN);
if (IS_ERR(d)) {
pr_err("Unable to get UART wakeup GPIO descriptor\n");
return;
}
ret = request_irq(gpiod_to_irq(d), &omap_serial_wake_interrupt,
IRQF_TRIGGER_RISING, "serial wakeup", NULL);
if (ret) {
gpiod_put(d);
pr_err("No interrupt for UART%d wake GPIO\n", idx + 1);
return;
}
enable_irq_wake(gpiod_to_irq(d));
}
int __init omap_serial_wakeup_init(void)
{
if (!cpu_is_omap16xx())
return 0;
if (uart1_ck != NULL)
omap_serial_set_port_wakeup(0);
if (uart2_ck != NULL)
omap_serial_set_port_wakeup(1);
if (uart3_ck != NULL)
omap_serial_set_port_wakeup(2);
return 0;
}
#endif /* CONFIG_OMAP_SERIAL_WAKE */
static int __init omap_init(void)
{
if (!cpu_class_is_omap1())
return -ENODEV;
return platform_device_register(&serial_device);
}
arch_initcall(omap_init);