diff options
Diffstat (limited to 'arch/arm/mach-omap2/serial.c')
| -rw-r--r-- | arch/arm/mach-omap2/serial.c | 116 |
1 files changed, 89 insertions, 27 deletions
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c index 54dfeb5d566..39b797bc14d 100644 --- a/arch/arm/mach-omap2/serial.c +++ b/arch/arm/mach-omap2/serial.c @@ -24,15 +24,16 @@ #include <linux/clk.h> #include <linux/io.h> -#include <mach/common.h> -#include <mach/board.h> -#include <mach/clock.h> -#include <mach/control.h> +#include <plat/common.h> +#include <plat/board.h> +#include <plat/clock.h> +#include <plat/control.h> #include "prm.h" #include "pm.h" #include "prm-regbits-34xx.h" +#define UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV 0x52 #define UART_OMAP_WER 0x17 /* Wake-up enable register */ #define DEFAULT_TIMEOUT (5 * HZ) @@ -73,7 +74,6 @@ static LIST_HEAD(uart_list); static struct plat_serial8250_port serial_platform_data0[] = { { - .membase = OMAP2_IO_ADDRESS(OMAP_UART1_BASE), .mapbase = OMAP_UART1_BASE, .irq = 72, .flags = UPF_BOOT_AUTOCONF, @@ -87,7 +87,6 @@ static struct plat_serial8250_port serial_platform_data0[] = { static struct plat_serial8250_port serial_platform_data1[] = { { - .membase = OMAP2_IO_ADDRESS(OMAP_UART2_BASE), .mapbase = OMAP_UART2_BASE, .irq = 73, .flags = UPF_BOOT_AUTOCONF, @@ -101,7 +100,6 @@ static struct plat_serial8250_port serial_platform_data1[] = { static struct plat_serial8250_port serial_platform_data2[] = { { - .membase = OMAP2_IO_ADDRESS(OMAP_UART3_BASE), .mapbase = OMAP_UART3_BASE, .irq = 74, .flags = UPF_BOOT_AUTOCONF, @@ -116,7 +114,6 @@ static struct plat_serial8250_port serial_platform_data2[] = { #ifdef CONFIG_ARCH_OMAP4 static struct plat_serial8250_port serial_platform_data3[] = { { - .membase = OMAP2_IO_ADDRESS(OMAP_UART4_BASE), .mapbase = OMAP_UART4_BASE, .irq = 70, .flags = UPF_BOOT_AUTOCONF, @@ -159,8 +156,6 @@ static inline void __init omap_uart_reset(struct omap_uart_state *uart) #if defined(CONFIG_PM) && defined(CONFIG_ARCH_OMAP3) -static int enable_off_mode; /* to be removed by full off-mode patches */ - static void omap_uart_save_context(struct omap_uart_state *uart) { u16 lcr = 0; @@ -539,7 +534,7 @@ static inline void omap_uart_idle_init(struct omap_uart_state *uart) {} #define DEV_CREATE_FILE(dev, attr) #endif /* CONFIG_PM */ -static struct omap_uart_state omap_uart[OMAP_MAX_NR_PORTS] = { +static struct omap_uart_state omap_uart[] = { { .pdev = { .name = "serial8250", @@ -578,6 +573,23 @@ static struct omap_uart_state omap_uart[OMAP_MAX_NR_PORTS] = { #endif }; +/* + * Override the default 8250 read handler: mem_serial_in() + * Empty RX fifo read causes an abort on omap3630 and omap4 + * This function makes sure that an empty rx fifo is not read on these silicons + * (OMAP1/2/3430 are not affected) + */ +static unsigned int serial_in_override(struct uart_port *up, int offset) +{ + if (UART_RX == offset) { + unsigned int lsr; + lsr = serial_read_reg(omap_uart[up->line].p, UART_LSR); + if (!(lsr & UART_LSR_DR)) + return -EPERM; + } + return serial_read_reg(omap_uart[up->line].p, offset); +} + void __init omap_serial_early_init(void) { int i; @@ -589,12 +601,22 @@ void __init omap_serial_early_init(void) * if not needed. */ - for (i = 0; i < OMAP_MAX_NR_PORTS; i++) { + for (i = 0; i < ARRAY_SIZE(omap_uart); 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; + /* + * 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); + continue; + } + sprintf(name, "uart%d_ick", i+1); uart->ick = clk_get(NULL, name); if (IS_ERR(uart->ick)) { @@ -627,24 +649,64 @@ void __init omap_serial_early_init(void) } } -void __init omap_serial_init(void) +/** + * omap_serial_init_port() - initialize single serial port + * @port: serial port number (0-3) + * + * 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(int port) { - int i; + struct omap_uart_state *uart; + struct platform_device *pdev; + struct device *dev; - for (i = 0; i < OMAP_MAX_NR_PORTS; i++) { - struct omap_uart_state *uart = &omap_uart[i]; - struct platform_device *pdev = &uart->pdev; - struct device *dev = &pdev->dev; + BUG_ON(port < 0); + BUG_ON(port >= ARRAY_SIZE(omap_uart)); - omap_uart_reset(uart); - omap_uart_idle_init(uart); + uart = &omap_uart[port]; + pdev = &uart->pdev; + dev = &pdev->dev; - if (WARN_ON(platform_device_register(pdev))) - continue; - if ((cpu_is_omap34xx() && uart->padconf) || - (uart->wk_en && uart->wk_mask)) { - device_init_wakeup(dev, true); - DEV_CREATE_FILE(dev, &dev_attr_sleep_timeout); - } + omap_uart_reset(uart); + omap_uart_idle_init(uart); + + if (WARN_ON(platform_device_register(pdev))) + return; + + if ((cpu_is_omap34xx() && uart->padconf) || + (uart->wk_en && uart->wk_mask)) { + device_init_wakeup(dev, true); + 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; +} + +/** + * omap_serial_init() - intialize all supported serial ports + * + * 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_init(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(omap_uart); i++) + omap_serial_init_port(i); } |