diff options
Diffstat (limited to 'arch/arm/mach-omap2/serial.c')
-rw-r--r-- | arch/arm/mach-omap2/serial.c | 113 |
1 files changed, 86 insertions, 27 deletions
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c index 8c964be..3771254 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); } |