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Diffstat (limited to 'arch/arm/mach-omap2/serial.c')
-rw-r--r--arch/arm/mach-omap2/serial.c113
1 files changed, 86 insertions, 27 deletions
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 8c964bec815..3771254dfa8 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -23,6 +23,7 @@
#include <linux/serial_reg.h>
#include <linux/clk.h>
#include <linux/io.h>
+#include <linux/delay.h>
#include <plat/common.h>
#include <plat/board.h>
@@ -36,7 +37,13 @@
#define UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV 0x52
#define UART_OMAP_WER 0x17 /* Wake-up enable register */
-#define DEFAULT_TIMEOUT (5 * HZ)
+/*
+ * NOTE: By default the serial timeout is disabled as it causes lost characters
+ * over the serial ports. This means that the UART clocks will stay on until
+ * disabled via sysfs. This also causes that any deeper omap sleep states are
+ * blocked.
+ */
+#define DEFAULT_TIMEOUT 0
struct omap_uart_state {
int num;
@@ -74,7 +81,6 @@ static LIST_HEAD(uart_list);
static struct plat_serial8250_port serial_platform_data0[] = {
{
- .mapbase = OMAP_UART1_BASE,
.irq = 72,
.flags = UPF_BOOT_AUTOCONF,
.iotype = UPIO_MEM,
@@ -87,7 +93,6 @@ static struct plat_serial8250_port serial_platform_data0[] = {
static struct plat_serial8250_port serial_platform_data1[] = {
{
- .mapbase = OMAP_UART2_BASE,
.irq = 73,
.flags = UPF_BOOT_AUTOCONF,
.iotype = UPIO_MEM,
@@ -100,7 +105,6 @@ static struct plat_serial8250_port serial_platform_data1[] = {
static struct plat_serial8250_port serial_platform_data2[] = {
{
- .mapbase = OMAP_UART3_BASE,
.irq = 74,
.flags = UPF_BOOT_AUTOCONF,
.iotype = UPIO_MEM,
@@ -111,10 +115,8 @@ static struct plat_serial8250_port serial_platform_data2[] = {
}
};
-#ifdef CONFIG_ARCH_OMAP4
static struct plat_serial8250_port serial_platform_data3[] = {
{
- .mapbase = OMAP_UART4_BASE,
.irq = 70,
.flags = UPF_BOOT_AUTOCONF,
.iotype = UPIO_MEM,
@@ -124,7 +126,15 @@ static struct plat_serial8250_port serial_platform_data3[] = {
.flags = 0
}
};
-#endif
+
+void __init omap2_set_globals_uart(struct omap_globals *omap2_globals)
+{
+ serial_platform_data0[0].mapbase = omap2_globals->uart1_phys;
+ serial_platform_data1[0].mapbase = omap2_globals->uart2_phys;
+ serial_platform_data2[0].mapbase = omap2_globals->uart3_phys;
+ serial_platform_data3[0].mapbase = omap2_globals->uart4_phys;
+}
+
static inline unsigned int __serial_read_reg(struct uart_port *up,
int offset)
{
@@ -139,6 +149,13 @@ static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
return (unsigned int)__raw_readb(up->membase + offset);
}
+static inline void __serial_write_reg(struct uart_port *up, int offset,
+ int value)
+{
+ offset <<= up->regshift;
+ __raw_writeb(value, up->membase + offset);
+}
+
static inline void serial_write_reg(struct plat_serial8250_port *p, int offset,
int value)
{
@@ -422,7 +439,8 @@ static void omap_uart_idle_init(struct omap_uart_state *uart)
uart->timeout = DEFAULT_TIMEOUT;
setup_timer(&uart->timer, omap_uart_idle_timer,
(unsigned long) uart);
- mod_timer(&uart->timer, jiffies + uart->timeout);
+ if (uart->timeout)
+ mod_timer(&uart->timer, jiffies + uart->timeout);
omap_uart_smart_idle_enable(uart, 0);
if (cpu_is_omap34xx()) {
@@ -520,7 +538,7 @@ static ssize_t sleep_timeout_store(struct device *dev,
unsigned int value;
if (sscanf(buf, "%u", &value) != 1) {
- printk(KERN_ERR "sleep_timeout_store: Invalid value\n");
+ dev_err(dev, "sleep_timeout_store: Invalid value\n");
return -EINVAL;
}
@@ -567,7 +585,7 @@ static struct omap_uart_state omap_uart[] = {
},
},
},
-#ifdef CONFIG_ARCH_OMAP4
+#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4)
{
.pdev = {
.name = "serial8250",
@@ -598,44 +616,69 @@ static unsigned int serial_in_override(struct uart_port *up, int offset)
return __serial_read_reg(up, offset);
}
+static void serial_out_override(struct uart_port *up, int offset, int value)
+{
+ unsigned int status, tmout = 10000;
+
+ status = __serial_read_reg(up, UART_LSR);
+ while (!(status & UART_LSR_THRE)) {
+ /* Wait up to 10ms for the character(s) to be sent. */
+ if (--tmout == 0)
+ break;
+ udelay(1);
+ status = __serial_read_reg(up, UART_LSR);
+ }
+ __serial_write_reg(up, offset, value);
+}
void __init omap_serial_early_init(void)
{
- int i;
+ int i, nr_ports;
char name[16];
+ if (!(cpu_is_omap3630() || cpu_is_omap4430()))
+ nr_ports = 3;
+ else
+ nr_ports = ARRAY_SIZE(omap_uart);
+
/*
* Make sure the serial ports are muxed on at this point.
* You have to mux them off in device drivers later on
* if not needed.
*/
- for (i = 0; i < ARRAY_SIZE(omap_uart); i++) {
+ for (i = 0; i < nr_ports; i++) {
struct omap_uart_state *uart = &omap_uart[i];
struct platform_device *pdev = &uart->pdev;
struct device *dev = &pdev->dev;
struct plat_serial8250_port *p = dev->platform_data;
+ /* Don't map zero-based physical address */
+ if (p->mapbase == 0) {
+ dev_warn(dev, "no physical address for uart#%d,"
+ " so skipping early_init...\n", i);
+ continue;
+ }
/*
* Module 4KB + L4 interconnect 4KB
* Static mapping, never released
*/
p->membase = ioremap(p->mapbase, SZ_8K);
if (!p->membase) {
- printk(KERN_ERR "ioremap failed for uart%i\n", i + 1);
+ dev_err(dev, "ioremap failed for uart%i\n", i + 1);
continue;
}
- sprintf(name, "uart%d_ick", i+1);
+ sprintf(name, "uart%d_ick", i + 1);
uart->ick = clk_get(NULL, name);
if (IS_ERR(uart->ick)) {
- printk(KERN_ERR "Could not get uart%d_ick\n", i+1);
+ dev_err(dev, "Could not get uart%d_ick\n", i + 1);
uart->ick = NULL;
}
sprintf(name, "uart%d_fck", i+1);
uart->fck = clk_get(NULL, name);
if (IS_ERR(uart->fck)) {
- printk(KERN_ERR "Could not get uart%d_fck\n", i+1);
+ dev_err(dev, "Could not get uart%d_fck\n", i + 1);
uart->fck = NULL;
}
@@ -678,6 +721,13 @@ void __init omap_serial_init_port(int port)
pdev = &uart->pdev;
dev = &pdev->dev;
+ /* Don't proceed if there's no clocks available */
+ if (unlikely(!uart->ick || !uart->fck)) {
+ WARN(1, "%s: can't init uart%d, no clocks available\n",
+ kobject_name(&dev->kobj), port);
+ return;
+ }
+
omap_uart_enable_clocks(uart);
omap_uart_reset(uart);
@@ -694,15 +744,19 @@ void __init omap_serial_init_port(int port)
DEV_CREATE_FILE(dev, &dev_attr_sleep_timeout);
}
- /* omap44xx: Never read empty UART fifo
- * omap3xxx: Never read empty UART fifo on UARTs
- * with IP rev >=0x52
- */
- if (cpu_is_omap44xx())
- uart->p->serial_in = serial_in_override;
- else if ((serial_read_reg(uart->p, UART_OMAP_MVER) & 0xFF)
- >= UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV)
- uart->p->serial_in = serial_in_override;
+ /*
+ * omap44xx: Never read empty UART fifo
+ * omap3xxx: Never read empty UART fifo on UARTs
+ * with IP rev >=0x52
+ */
+ if (cpu_is_omap44xx()) {
+ uart->p->serial_in = serial_in_override;
+ uart->p->serial_out = serial_out_override;
+ } else if ((serial_read_reg(uart->p, UART_OMAP_MVER) & 0xFF)
+ >= UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV) {
+ uart->p->serial_in = serial_in_override;
+ uart->p->serial_out = serial_out_override;
+ }
}
/**
@@ -714,8 +768,13 @@ void __init omap_serial_init_port(int port)
*/
void __init omap_serial_init(void)
{
- int i;
+ int i, nr_ports;
+
+ if (!(cpu_is_omap3630() || cpu_is_omap4430()))
+ nr_ports = 3;
+ else
+ nr_ports = ARRAY_SIZE(omap_uart);
- for (i = 0; i < ARRAY_SIZE(omap_uart); i++)
+ for (i = 0; i < nr_ports; i++)
omap_serial_init_port(i);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-29 04:14:38 +0000