mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 18:59:44 +00:00
956a8bae53
The same problem that is seen on some OMAP3 is also seen on some OMAP4 so include them in the test in order to prevent some hangs during SPL. [trini: Re-word commit message, make apply cleanly] Signed-off-by: Tom Rini <trini@ti.com>
310 lines
8.5 KiB
C
310 lines
8.5 KiB
C
/*
|
|
* COM1 NS16550 support
|
|
* originally from linux source (arch/powerpc/boot/ns16550.c)
|
|
* modified to use CONFIG_SYS_ISA_MEM and new defines
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <fdtdec.h>
|
|
#include <ns16550.h>
|
|
#include <serial.h>
|
|
#include <watchdog.h>
|
|
#include <linux/types.h>
|
|
#include <asm/io.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
#define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */
|
|
#define UART_MCRVAL (UART_MCR_DTR | \
|
|
UART_MCR_RTS) /* RTS/DTR */
|
|
#define UART_FCRVAL (UART_FCR_FIFO_EN | \
|
|
UART_FCR_RXSR | \
|
|
UART_FCR_TXSR) /* Clear & enable FIFOs */
|
|
|
|
#ifndef CONFIG_DM_SERIAL
|
|
#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
|
|
#define serial_out(x, y) outb(x, (ulong)y)
|
|
#define serial_in(y) inb((ulong)y)
|
|
#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0)
|
|
#define serial_out(x, y) out_be32(y, x)
|
|
#define serial_in(y) in_be32(y)
|
|
#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0)
|
|
#define serial_out(x, y) out_le32(y, x)
|
|
#define serial_in(y) in_le32(y)
|
|
#else
|
|
#define serial_out(x, y) writeb(x, y)
|
|
#define serial_in(y) readb(y)
|
|
#endif
|
|
#endif /* !CONFIG_DM_SERIAL */
|
|
|
|
#if defined(CONFIG_SOC_KEYSTONE)
|
|
#define UART_REG_VAL_PWREMU_MGMT_UART_DISABLE 0
|
|
#define UART_REG_VAL_PWREMU_MGMT_UART_ENABLE ((1 << 14) | (1 << 13) | (1 << 0))
|
|
#undef UART_MCRVAL
|
|
#ifdef CONFIG_SERIAL_HW_FLOW_CONTROL
|
|
#define UART_MCRVAL (UART_MCR_RTS | UART_MCR_AFE)
|
|
#else
|
|
#define UART_MCRVAL (UART_MCR_RTS)
|
|
#endif
|
|
#endif
|
|
|
|
#ifndef CONFIG_SYS_NS16550_IER
|
|
#define CONFIG_SYS_NS16550_IER 0x00
|
|
#endif /* CONFIG_SYS_NS16550_IER */
|
|
|
|
#ifdef CONFIG_DM_SERIAL
|
|
static void ns16550_writeb(NS16550_t port, int offset, int value)
|
|
{
|
|
struct ns16550_platdata *plat = port->plat;
|
|
unsigned char *addr;
|
|
|
|
offset *= 1 << plat->reg_shift;
|
|
addr = map_sysmem(plat->base, 0) + offset;
|
|
/*
|
|
* As far as we know it doesn't make sense to support selection of
|
|
* these options at run-time, so use the existing CONFIG options.
|
|
*/
|
|
#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
|
|
outb(value, (ulong)addr);
|
|
#elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
|
|
out_le32(addr, value);
|
|
#elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
|
|
out_be32(addr, value);
|
|
#elif defined(CONFIG_SYS_BIG_ENDIAN)
|
|
writeb(value, addr + (1 << plat->reg_shift) - 1);
|
|
#else
|
|
writeb(value, addr);
|
|
#endif
|
|
}
|
|
|
|
static int ns16550_readb(NS16550_t port, int offset)
|
|
{
|
|
struct ns16550_platdata *plat = port->plat;
|
|
unsigned char *addr;
|
|
|
|
offset *= 1 << plat->reg_shift;
|
|
addr = map_sysmem(plat->base, 0) + offset;
|
|
#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
|
|
return inb((ulong)addr);
|
|
#elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
|
|
return in_le32(addr);
|
|
#elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
|
|
return in_be32(addr);
|
|
#elif defined(CONFIG_SYS_BIG_ENDIAN)
|
|
return readb(addr + (1 << plat->reg_shift) - 1);
|
|
#else
|
|
return readb(addr);
|
|
#endif
|
|
}
|
|
|
|
/* We can clean these up once everything is moved to driver model */
|
|
#define serial_out(value, addr) \
|
|
ns16550_writeb(com_port, addr - (unsigned char *)com_port, value)
|
|
#define serial_in(addr) \
|
|
ns16550_readb(com_port, addr - (unsigned char *)com_port)
|
|
#endif
|
|
|
|
int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate)
|
|
{
|
|
const unsigned int mode_x_div = 16;
|
|
|
|
#ifdef CONFIG_OMAP1510
|
|
/* If can't cleanly clock 115200 set div to 1 */
|
|
if ((clock == 12000000) && (baudrate == 115200)) {
|
|
port->osc_12m_sel = OSC_12M_SEL; /* enable 6.5 * divisor */
|
|
return 1; /* return 1 for base divisor */
|
|
}
|
|
port->osc_12m_sel = 0; /* clear if previsouly set */
|
|
#endif
|
|
|
|
return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate);
|
|
}
|
|
|
|
static void NS16550_setbrg(NS16550_t com_port, int baud_divisor)
|
|
{
|
|
serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
|
|
serial_out(baud_divisor & 0xff, &com_port->dll);
|
|
serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
|
|
serial_out(UART_LCRVAL, &com_port->lcr);
|
|
}
|
|
|
|
void NS16550_init(NS16550_t com_port, int baud_divisor)
|
|
{
|
|
#if (defined(CONFIG_SPL_BUILD) && \
|
|
(defined(CONFIG_OMAP34XX) || defined(CONFIG_OMAP44XX)))
|
|
/*
|
|
* On some OMAP3/OMAP4 devices when UART3 is configured for boot mode
|
|
* before SPL starts only THRE bit is set. We have to empty the
|
|
* transmitter before initialization starts.
|
|
*/
|
|
if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE))
|
|
== UART_LSR_THRE) {
|
|
if (baud_divisor != -1)
|
|
NS16550_setbrg(com_port, baud_divisor);
|
|
serial_out(0, &com_port->mdr1);
|
|
}
|
|
#endif
|
|
|
|
while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
|
|
;
|
|
|
|
serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
|
|
#if defined(CONFIG_OMAP) || defined(CONFIG_AM33XX) || \
|
|
defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
|
|
serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
|
|
#endif
|
|
NS16550_setbrg(com_port, 0);
|
|
serial_out(UART_MCRVAL, &com_port->mcr);
|
|
serial_out(UART_FCRVAL, &com_port->fcr);
|
|
if (baud_divisor != -1)
|
|
NS16550_setbrg(com_port, baud_divisor);
|
|
#if defined(CONFIG_OMAP) || \
|
|
defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) || \
|
|
defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
|
|
|
|
/* /16 is proper to hit 115200 with 48MHz */
|
|
serial_out(0, &com_port->mdr1);
|
|
#endif /* CONFIG_OMAP */
|
|
#if defined(CONFIG_SOC_KEYSTONE)
|
|
serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC);
|
|
#endif
|
|
}
|
|
|
|
#ifndef CONFIG_NS16550_MIN_FUNCTIONS
|
|
void NS16550_reinit(NS16550_t com_port, int baud_divisor)
|
|
{
|
|
serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
|
|
NS16550_setbrg(com_port, 0);
|
|
serial_out(UART_MCRVAL, &com_port->mcr);
|
|
serial_out(UART_FCRVAL, &com_port->fcr);
|
|
NS16550_setbrg(com_port, baud_divisor);
|
|
}
|
|
#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
|
|
|
|
void NS16550_putc(NS16550_t com_port, char c)
|
|
{
|
|
while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0)
|
|
;
|
|
serial_out(c, &com_port->thr);
|
|
|
|
/*
|
|
* Call watchdog_reset() upon newline. This is done here in putc
|
|
* since the environment code uses a single puts() to print the complete
|
|
* environment upon "printenv". So we can't put this watchdog call
|
|
* in puts().
|
|
*/
|
|
if (c == '\n')
|
|
WATCHDOG_RESET();
|
|
}
|
|
|
|
#ifndef CONFIG_NS16550_MIN_FUNCTIONS
|
|
char NS16550_getc(NS16550_t com_port)
|
|
{
|
|
while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
|
|
#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY)
|
|
extern void usbtty_poll(void);
|
|
usbtty_poll();
|
|
#endif
|
|
WATCHDOG_RESET();
|
|
}
|
|
return serial_in(&com_port->rbr);
|
|
}
|
|
|
|
int NS16550_tstc(NS16550_t com_port)
|
|
{
|
|
return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0;
|
|
}
|
|
|
|
#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
|
|
|
|
#ifdef CONFIG_DM_SERIAL
|
|
static int ns16550_serial_putc(struct udevice *dev, const char ch)
|
|
{
|
|
struct NS16550 *const com_port = dev_get_priv(dev);
|
|
|
|
if (!(serial_in(&com_port->lsr) & UART_LSR_THRE))
|
|
return -EAGAIN;
|
|
serial_out(ch, &com_port->thr);
|
|
|
|
/*
|
|
* Call watchdog_reset() upon newline. This is done here in putc
|
|
* since the environment code uses a single puts() to print the complete
|
|
* environment upon "printenv". So we can't put this watchdog call
|
|
* in puts().
|
|
*/
|
|
if (ch == '\n')
|
|
WATCHDOG_RESET();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ns16550_serial_pending(struct udevice *dev, bool input)
|
|
{
|
|
struct NS16550 *const com_port = dev_get_priv(dev);
|
|
|
|
if (input)
|
|
return serial_in(&com_port->lsr) & UART_LSR_DR ? 1 : 0;
|
|
else
|
|
return serial_in(&com_port->lsr) & UART_LSR_THRE ? 0 : 1;
|
|
}
|
|
|
|
static int ns16550_serial_getc(struct udevice *dev)
|
|
{
|
|
struct NS16550 *const com_port = dev_get_priv(dev);
|
|
|
|
if (!(serial_in(&com_port->lsr) & UART_LSR_DR))
|
|
return -EAGAIN;
|
|
|
|
return serial_in(&com_port->rbr);
|
|
}
|
|
|
|
static int ns16550_serial_setbrg(struct udevice *dev, int baudrate)
|
|
{
|
|
struct NS16550 *const com_port = dev_get_priv(dev);
|
|
struct ns16550_platdata *plat = com_port->plat;
|
|
int clock_divisor;
|
|
|
|
clock_divisor = ns16550_calc_divisor(com_port, plat->clock, baudrate);
|
|
|
|
NS16550_setbrg(com_port, clock_divisor);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ns16550_serial_probe(struct udevice *dev)
|
|
{
|
|
struct NS16550 *const com_port = dev_get_priv(dev);
|
|
|
|
com_port->plat = dev_get_platdata(dev);
|
|
NS16550_init(com_port, -1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF_CONTROL
|
|
int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
|
|
{
|
|
struct ns16550_platdata *plat = dev->platdata;
|
|
fdt_addr_t addr;
|
|
|
|
addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
|
|
if (addr == FDT_ADDR_T_NONE)
|
|
return -EINVAL;
|
|
|
|
plat->base = addr;
|
|
plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
|
|
"reg-shift", 1);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
const struct dm_serial_ops ns16550_serial_ops = {
|
|
.putc = ns16550_serial_putc,
|
|
.pending = ns16550_serial_pending,
|
|
.getc = ns16550_serial_getc,
|
|
.setbrg = ns16550_serial_setbrg,
|
|
};
|
|
#endif /* CONFIG_DM_SERIAL */
|