[people/ms/u-boot.git] / drivers / serial / ns16550.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 <clk.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 */

#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 */

static inline void serial_out_shift(void *addr, int shift, int value)
{
#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_NS16550_MEM32)
	writel(value, addr);
#elif defined(CONFIG_SYS_BIG_ENDIAN)
	writeb(value, addr + (1 << shift) - 1);
#else
	writeb(value, addr);
#endif
}

static inline int serial_in_shift(void *addr, int shift)
{
#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_NS16550_MEM32)
	return readl(addr);
#elif defined(CONFIG_SYS_BIG_ENDIAN)
	return readb(addr + (1 << shift) - 1);
#else
	return readb(addr);
#endif
}

#ifdef CONFIG_DM_SERIAL

#ifndef CONFIG_SYS_NS16550_CLK
#define CONFIG_SYS_NS16550_CLK  0
#endif

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 = (unsigned char *)plat->base + 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.
	 */
	serial_out_shift(addr + plat->reg_offset, plat->reg_shift, value);
}

static int ns16550_readb(NS16550_t port, int offset)
{
	struct ns16550_platdata *plat = port->plat;
	unsigned char *addr;

	offset *= 1 << plat->reg_shift;
	addr = (unsigned char *)plat->base + offset;

	return serial_in_shift(addr + plat->reg_offset, plat->reg_shift);
}

static u32 ns16550_getfcr(NS16550_t port)
{
	struct ns16550_platdata *plat = port->plat;

	return plat->fcr;
}

/* We can clean these up once everything is moved to driver model */
#define serial_out(value, addr)	\
	ns16550_writeb(com_port, \
		(unsigned char *)addr - (unsigned char *)com_port, value)
#define serial_in(addr) \
	ns16550_readb(com_port, \
		(unsigned char *)addr - (unsigned char *)com_port)
#else
static u32 ns16550_getfcr(NS16550_t port)
{
	return UART_FCR_DEFVAL;
}
#endif

int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate)
{
	const unsigned int mode_x_div = 16;

	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
	serial_out(UART_MCRVAL, &com_port->mcr);
	serial_out(ns16550_getfcr(com_port), &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(ns16550_getfcr(com_port), &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_DEBUG_UART_NS16550

#include <debug_uart.h>

#define serial_dout(reg, value)	\
	serial_out_shift((char *)com_port + \
		((char *)reg - (char *)com_port) * \
			(1 << CONFIG_DEBUG_UART_SHIFT), \
		CONFIG_DEBUG_UART_SHIFT, value)
#define serial_din(reg) \
	serial_in_shift((char *)com_port + \
		((char *)reg - (char *)com_port) * \
			(1 << CONFIG_DEBUG_UART_SHIFT), \
		CONFIG_DEBUG_UART_SHIFT)

static inline void _debug_uart_init(void)
{
	struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
	int baud_divisor;

	/*
	 * We copy the code from above because it is already horribly messy.
	 * Trying to refactor to nicely remove the duplication doesn't seem
	 * feasible. The better fix is to move all users of this driver to
	 * driver model.
	 */
	baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
					    CONFIG_BAUDRATE);
	serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
	serial_dout(&com_port->mcr, UART_MCRVAL);
	serial_dout(&com_port->fcr, UART_FCR_DEFVAL);

	serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
	serial_dout(&com_port->dll, baud_divisor & 0xff);
	serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
	serial_dout(&com_port->lcr, UART_LCRVAL);
}

static inline void _debug_uart_putc(int ch)
{
	struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;

	while (!(serial_din(&com_port->lsr) & UART_LSR_THRE))
		;
	serial_dout(&com_port->thr, ch);
}

DEBUG_UART_FUNCS

#endif

#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;
}

#if CONFIG_IS_ENABLED(OF_CONTROL)
enum {
	PORT_NS16550 = 0,
	PORT_JZ4780,
};
#endif

#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
{
	struct ns16550_platdata *plat = dev->platdata;
	const u32 port_type = dev_get_driver_data(dev);
	fdt_addr_t addr;
	struct clk clk;
	int err;

	/* try Processor Local Bus device first */
	addr = dev_get_addr(dev);
#if defined(CONFIG_PCI) && defined(CONFIG_DM_PCI)
	if (addr == FDT_ADDR_T_NONE) {
		/* then try pci device */
		struct fdt_pci_addr pci_addr;
		u32 bar;
		int ret;

		/* we prefer to use a memory-mapped register */
		ret = fdtdec_get_pci_addr(gd->fdt_blob, dev_of_offset(dev),
					  FDT_PCI_SPACE_MEM32, "reg",
					  &pci_addr);
		if (ret) {
			/* try if there is any i/o-mapped register */
			ret = fdtdec_get_pci_addr(gd->fdt_blob,
						  dev_of_offset(dev),
						  FDT_PCI_SPACE_IO,
						  "reg", &pci_addr);
			if (ret)
				return ret;
		}

		ret = fdtdec_get_pci_bar32(dev, &pci_addr, &bar);
		if (ret)
			return ret;

		addr = bar;
	}
#endif

	if (addr == FDT_ADDR_T_NONE)
		return -EINVAL;

#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
	plat->base = addr;
#else
	plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE);
#endif

	plat->reg_offset = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
				     "reg-offset", 0);
	plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
					 "reg-shift", 0);

	err = clk_get_by_index(dev, 0, &clk);
	if (!err) {
		err = clk_get_rate(&clk);
		if (!IS_ERR_VALUE(err))
			plat->clock = err;
	} else if (err != -ENOENT && err != -ENODEV && err != -ENOSYS) {
		debug("ns16550 failed to get clock\n");
		return err;
	}

	if (!plat->clock)
		plat->clock = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
					     "clock-frequency",
					     CONFIG_SYS_NS16550_CLK);
	if (!plat->clock) {
		debug("ns16550 clock not defined\n");
		return -EINVAL;
	}

	plat->fcr = UART_FCR_DEFVAL;
	if (port_type == PORT_JZ4780)
		plat->fcr |= UART_FCR_UME;

	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,
};

#if !CONFIG_IS_ENABLED(OF_PLATDATA)
#if CONFIG_IS_ENABLED(OF_CONTROL)
/*
 * Please consider existing compatible strings before adding a new
 * one to keep this table compact. Or you may add a generic "ns16550"
 * compatible string to your dts.
 */
static const struct udevice_id ns16550_serial_ids[] = {
	{ .compatible = "ns16550",		.data = PORT_NS16550 },
	{ .compatible = "ns16550a",		.data = PORT_NS16550 },
	{ .compatible = "ingenic,jz4780-uart",	.data = PORT_JZ4780  },
	{ .compatible = "nvidia,tegra20-uart",	.data = PORT_NS16550 },
	{ .compatible = "snps,dw-apb-uart",	.data = PORT_NS16550 },
	{ .compatible = "ti,omap2-uart",	.data = PORT_NS16550 },
	{ .compatible = "ti,omap3-uart",	.data = PORT_NS16550 },
	{ .compatible = "ti,omap4-uart",	.data = PORT_NS16550 },
	{ .compatible = "ti,am3352-uart",	.data = PORT_NS16550 },
	{ .compatible = "ti,am4372-uart",	.data = PORT_NS16550 },
	{ .compatible = "ti,dra742-uart",	.data = PORT_NS16550 },
	{}
};
#endif

#if CONFIG_IS_ENABLED(SERIAL_PRESENT)
U_BOOT_DRIVER(ns16550_serial) = {
	.name	= "ns16550_serial",
	.id	= UCLASS_SERIAL,
#if CONFIG_IS_ENABLED(OF_CONTROL)
	.of_match = ns16550_serial_ids,
	.ofdata_to_platdata = ns16550_serial_ofdata_to_platdata,
	.platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
#endif
	.priv_auto_alloc_size = sizeof(struct NS16550),
	.probe = ns16550_serial_probe,
	.ops	= &ns16550_serial_ops,
	.flags	= DM_FLAG_PRE_RELOC,
};
#endif
#endif /* !OF_PLATDATA */
#endif /* CONFIG_DM_SERIAL */
Commit	Line	Data
e85390dc WD	1	/*
e85390dc WD	2	* COM1 NS16550 support
a47a12be	3	* originally from linux source (arch/powerpc/boot/ns16550.c)
6d0f6bcf	4	* modified to use CONFIG_SYS_ISA_MEM and new defines
e85390dc WD	5	*/
e85390dc WD	6
fa54eb12	7	#include <common.h>
50fce1d5	8	#include <clk.h>
12e431b2 SG	9	#include <dm.h>
	10	#include <errno.h>
	11	#include <fdtdec.h>
e85390dc	12	#include <ns16550.h>
12e431b2	13	#include <serial.h>
a1b322a9	14	#include <watchdog.h>
167cdad1 GR	15	#include <linux/types.h>
167cdad1 GR	16	#include <asm/io.h>
e85390dc	17
12e431b2 SG	18	DECLARE_GLOBAL_DATA_PTR;
12e431b2 SG	19
200779e3 DZ	20	#define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */
	21	#define UART_MCRVAL (UART_MCR_DTR \| \
	22	UART_MCR_RTS) /* RTS/DTR */
12e431b2 SG	23
12e431b2 SG	24	#ifndef CONFIG_DM_SERIAL
167cdad1	25	#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
f8df9d0d SG	26	#define serial_out(x, y) outb(x, (ulong)y)
f8df9d0d SG	27	#define serial_in(y) inb((ulong)y)
79df1208	28	#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0)
f8df9d0d SG	29	#define serial_out(x, y) out_be32(y, x)
f8df9d0d SG	30	#define serial_in(y) in_be32(y)
79df1208	31	#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0)
f8df9d0d SG	32	#define serial_out(x, y) out_le32(y, x)
f8df9d0d SG	33	#define serial_in(y) in_le32(y)
167cdad1	34	#else
f8df9d0d SG	35	#define serial_out(x, y) writeb(x, y)
f8df9d0d SG	36	#define serial_in(y) readb(y)
167cdad1	37	#endif
12e431b2	38	#endif /* !CONFIG_DM_SERIAL */
e85390dc	39
7c387646	40	#if defined(CONFIG_SOC_KEYSTONE)
ef509b90 VA	41	#define UART_REG_VAL_PWREMU_MGMT_UART_DISABLE 0
ef509b90 VA	42	#define UART_REG_VAL_PWREMU_MGMT_UART_ENABLE ((1 << 14) \| (1 << 13) \| (1 << 0))
d57dee57 KM	43	#undef UART_MCRVAL
	44	#ifdef CONFIG_SERIAL_HW_FLOW_CONTROL
	45	#define UART_MCRVAL (UART_MCR_RTS \| UART_MCR_AFE)
	46	#else
	47	#define UART_MCRVAL (UART_MCR_RTS)
	48	#endif
ef509b90 VA	49	#endif
ef509b90 VA	50
a160ea0b PW	51	#ifndef CONFIG_SYS_NS16550_IER
	52	#define CONFIG_SYS_NS16550_IER 0x00
	53	#endif /* CONFIG_SYS_NS16550_IER */
	54
363e6da1	55	static inline void serial_out_shift(void *addr, int shift, int value)
76571674	56	{
12e431b2	57	#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
1f77690e	58	outb(value, (ulong)addr);
12e431b2 SG	59	#elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
	60	out_le32(addr, value);
	61	#elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
	62	out_be32(addr, value);
90914008 SG	63	#elif defined(CONFIG_SYS_NS16550_MEM32)
90914008 SG	64	writel(value, addr);
12e431b2	65	#elif defined(CONFIG_SYS_BIG_ENDIAN)
76571674	66	writeb(value, addr + (1 << shift) - 1);
12e431b2 SG	67	#else
	68	writeb(value, addr);
	69	#endif
	70	}
	71
363e6da1	72	static inline int serial_in_shift(void *addr, int shift)
12e431b2	73	{
12e431b2	74	#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
1f77690e	75	return inb((ulong)addr);
12e431b2 SG	76	#elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
	77	return in_le32(addr);
	78	#elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
	79	return in_be32(addr);
90914008 SG	80	#elif defined(CONFIG_SYS_NS16550_MEM32)
90914008 SG	81	return readl(addr);
12e431b2	82	#elif defined(CONFIG_SYS_BIG_ENDIAN)
20379c11	83	return readb(addr + (1 << shift) - 1);
12e431b2 SG	84	#else
	85	return readb(addr);
	86	#endif
	87	}
	88
fa4ce723 MV	89	#ifdef CONFIG_DM_SERIAL
	90
	91	#ifndef CONFIG_SYS_NS16550_CLK
	92	#define CONFIG_SYS_NS16550_CLK 0
	93	#endif
	94
76571674 SG	95	static void ns16550_writeb(NS16550_t port, int offset, int value)
	96	{
	97	struct ns16550_platdata *plat = port->plat;
	98	unsigned char *addr;
	99
	100	offset *= 1 << plat->reg_shift;
df8ec55d PB	101	addr = (unsigned char *)plat->base + offset;
df8ec55d PB	102
76571674 SG	103	/*
	104	* As far as we know it doesn't make sense to support selection of
	105	* these options at run-time, so use the existing CONFIG options.
	106	*/
59b35ddd	107	serial_out_shift(addr + plat->reg_offset, plat->reg_shift, value);
76571674 SG	108	}
	109
	110	static int ns16550_readb(NS16550_t port, int offset)
	111	{
	112	struct ns16550_platdata *plat = port->plat;
	113	unsigned char *addr;
	114
	115	offset *= 1 << plat->reg_shift;
df8ec55d	116	addr = (unsigned char *)plat->base + offset;
76571674	117
59b35ddd	118	return serial_in_shift(addr + plat->reg_offset, plat->reg_shift);
76571674 SG	119	}
76571674 SG	120
65f83802 MV	121	static u32 ns16550_getfcr(NS16550_t port)
	122	{
	123	struct ns16550_platdata *plat = port->plat;
	124
	125	return plat->fcr;
	126	}
	127
12e431b2 SG	128	/* We can clean these up once everything is moved to driver model */
12e431b2 SG	129	#define serial_out(value, addr) \
363e6da1 SG	130	ns16550_writeb(com_port, \
363e6da1 SG	131	(unsigned char )addr - (unsigned char )com_port, value)
12e431b2	132	#define serial_in(addr) \
363e6da1 SG	133	ns16550_readb(com_port, \
363e6da1 SG	134	(unsigned char )addr - (unsigned char )com_port)
65f83802 MV	135	#else
	136	static u32 ns16550_getfcr(NS16550_t port)
	137	{
17fa0326	138	return UART_FCR_DEFVAL;
65f83802	139	}
12e431b2 SG	140	#endif
12e431b2 SG	141
03c6f176	142	int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate)
fa54eb12 SG	143	{
	144	const unsigned int mode_x_div = 16;
	145
21d00436 SG	146	return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate);
	147	}
	148
8bbe33c8 SG	149	static void NS16550_setbrg(NS16550_t com_port, int baud_divisor)
	150	{
	151	serial_out(UART_LCR_BKSE \| UART_LCRVAL, &com_port->lcr);
	152	serial_out(baud_divisor & 0xff, &com_port->dll);
	153	serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
	154	serial_out(UART_LCRVAL, &com_port->lcr);
	155	}
	156
f8df9d0d	157	void NS16550_init(NS16550_t com_port, int baud_divisor)
e85390dc	158	{
956a8bae GG	159	#if (defined(CONFIG_SPL_BUILD) && \
956a8bae GG	160	(defined(CONFIG_OMAP34XX) \|\| defined(CONFIG_OMAP44XX)))
fd2aeac5	161	/*
956a8bae GG	162	* On some OMAP3/OMAP4 devices when UART3 is configured for boot mode
	163	* before SPL starts only THRE bit is set. We have to empty the
	164	* transmitter before initialization starts.
fd2aeac5 MH	165	*/
	166	if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT \| UART_LSR_THRE))
	167	== UART_LSR_THRE) {
12e431b2 SG	168	if (baud_divisor != -1)
12e431b2 SG	169	NS16550_setbrg(com_port, baud_divisor);
fd2aeac5 MH	170	serial_out(0, &com_port->mdr1);
	171	}
	172	#endif
	173
cb55b332 SW	174	while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
	175	;
	176
a160ea0b	177	serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
456ccfdf TR	178	#if defined(CONFIG_OMAP) \|\| defined(CONFIG_AM33XX) \|\| \
456ccfdf TR	179	defined(CONFIG_TI81XX) \|\| defined(CONFIG_AM43XX)
167cdad1	180	serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
945af8d7	181	#endif
167cdad1	182	serial_out(UART_MCRVAL, &com_port->mcr);
65f83802	183	serial_out(ns16550_getfcr(com_port), &com_port->fcr);
12e431b2 SG	184	if (baud_divisor != -1)
12e431b2 SG	185	NS16550_setbrg(com_port, baud_divisor);
8ac22a60	186	#if defined(CONFIG_OMAP) \|\| \
6213a68f	187	defined(CONFIG_AM33XX) \|\| defined(CONFIG_SOC_DA8XX) \|\| \
9ed6e412	188	defined(CONFIG_TI81XX) \|\| defined(CONFIG_AM43XX)
5289e83a	189
f8df9d0d SG	190	/* /16 is proper to hit 115200 with 48MHz */
f8df9d0d SG	191	serial_out(0, &com_port->mdr1);
b4746d8b	192	#endif /* CONFIG_OMAP */
7c387646	193	#if defined(CONFIG_SOC_KEYSTONE)
ef509b90 VA	194	serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC);
ef509b90 VA	195	#endif
e85390dc WD	196	}
e85390dc WD	197
f5675aa5	198	#ifndef CONFIG_NS16550_MIN_FUNCTIONS
f8df9d0d	199	void NS16550_reinit(NS16550_t com_port, int baud_divisor)
e85390dc	200	{
a160ea0b	201	serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
8bbe33c8	202	NS16550_setbrg(com_port, 0);
167cdad1	203	serial_out(UART_MCRVAL, &com_port->mcr);
65f83802	204	serial_out(ns16550_getfcr(com_port), &com_port->fcr);
8bbe33c8	205	NS16550_setbrg(com_port, baud_divisor);
e85390dc	206	}
f5675aa5	207	#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
e85390dc	208
f8df9d0d	209	void NS16550_putc(NS16550_t com_port, char c)
e85390dc	210	{
f8df9d0d SG	211	while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0)
f8df9d0d SG	212	;
167cdad1	213	serial_out(c, &com_port->thr);
1a2d9b30 SR	214
	215	/*
	216	* Call watchdog_reset() upon newline. This is done here in putc
	217	* since the environment code uses a single puts() to print the complete
	218	* environment upon "printenv". So we can't put this watchdog call
	219	* in puts().
	220	*/
	221	if (c == '\n')
	222	WATCHDOG_RESET();
e85390dc WD	223	}
e85390dc WD	224
f5675aa5	225	#ifndef CONFIG_NS16550_MIN_FUNCTIONS
f8df9d0d	226	char NS16550_getc(NS16550_t com_port)
e85390dc	227	{
167cdad1	228	while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
f2041388	229	#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY)
232c150a WD	230	extern void usbtty_poll(void);
	231	usbtty_poll();
	232	#endif
a1b322a9	233	WATCHDOG_RESET();
232c150a	234	}
167cdad1	235	return serial_in(&com_port->rbr);
e85390dc WD	236	}
e85390dc WD	237
f8df9d0d	238	int NS16550_tstc(NS16550_t com_port)
e85390dc	239	{
f8df9d0d	240	return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0;
e85390dc WD	241	}
e85390dc WD	242
f5675aa5	243	#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
12e431b2	244
21d00436 SG	245	#ifdef CONFIG_DEBUG_UART_NS16550
	246
	247	#include <debug_uart.h>
	248
6e780c7a SG	249	#define serial_dout(reg, value) \
	250	serial_out_shift((char *)com_port + \
	251	((char )reg - (char )com_port) * \
	252	(1 << CONFIG_DEBUG_UART_SHIFT), \
	253	CONFIG_DEBUG_UART_SHIFT, value)
	254	#define serial_din(reg) \
	255	serial_in_shift((char *)com_port + \
	256	((char )reg - (char )com_port) * \
	257	(1 << CONFIG_DEBUG_UART_SHIFT), \
	258	CONFIG_DEBUG_UART_SHIFT)
	259
97b05973	260	static inline void _debug_uart_init(void)
21d00436 SG	261	{
	262	struct NS16550 com_port = (struct NS16550 )CONFIG_DEBUG_UART_BASE;
	263	int baud_divisor;
	264
	265	/*
	266	* We copy the code from above because it is already horribly messy.
	267	* Trying to refactor to nicely remove the duplication doesn't seem
	268	* feasible. The better fix is to move all users of this driver to
	269	* driver model.
	270	*/
03c6f176 MV	271	baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
03c6f176 MV	272	CONFIG_BAUDRATE);
6e780c7a SG	273	serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
6e780c7a SG	274	serial_dout(&com_port->mcr, UART_MCRVAL);
17fa0326	275	serial_dout(&com_port->fcr, UART_FCR_DEFVAL);
6e780c7a SG	276
	277	serial_dout(&com_port->lcr, UART_LCR_BKSE \| UART_LCRVAL);
	278	serial_dout(&com_port->dll, baud_divisor & 0xff);
	279	serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
	280	serial_dout(&com_port->lcr, UART_LCRVAL);
21d00436 SG	281	}
	282
	283	static inline void _debug_uart_putc(int ch)
	284	{
	285	struct NS16550 com_port = (struct NS16550 )CONFIG_DEBUG_UART_BASE;
	286
6e780c7a	287	while (!(serial_din(&com_port->lsr) & UART_LSR_THRE))
21d00436	288	;
6e780c7a	289	serial_dout(&com_port->thr, ch);
21d00436 SG	290	}
	291
	292	DEBUG_UART_FUNCS
	293
	294	#endif
	295
12e431b2 SG	296	#ifdef CONFIG_DM_SERIAL
	297	static int ns16550_serial_putc(struct udevice *dev, const char ch)
	298	{
	299	struct NS16550 *const com_port = dev_get_priv(dev);
	300
	301	if (!(serial_in(&com_port->lsr) & UART_LSR_THRE))
	302	return -EAGAIN;
	303	serial_out(ch, &com_port->thr);
	304
	305	/*
	306	* Call watchdog_reset() upon newline. This is done here in putc
	307	* since the environment code uses a single puts() to print the complete
	308	* environment upon "printenv". So we can't put this watchdog call
	309	* in puts().
	310	*/
	311	if (ch == '\n')
	312	WATCHDOG_RESET();
	313
	314	return 0;
	315	}
	316
	317	static int ns16550_serial_pending(struct udevice *dev, bool input)
	318	{
	319	struct NS16550 *const com_port = dev_get_priv(dev);
	320
	321	if (input)
	322	return serial_in(&com_port->lsr) & UART_LSR_DR ? 1 : 0;
	323	else
	324	return serial_in(&com_port->lsr) & UART_LSR_THRE ? 0 : 1;
	325	}
	326
	327	static int ns16550_serial_getc(struct udevice *dev)
	328	{
	329	struct NS16550 *const com_port = dev_get_priv(dev);
	330
aea2be20	331	if (!(serial_in(&com_port->lsr) & UART_LSR_DR))
12e431b2 SG	332	return -EAGAIN;
	333
	334	return serial_in(&com_port->rbr);
	335	}
	336
	337	static int ns16550_serial_setbrg(struct udevice *dev, int baudrate)
	338	{
	339	struct NS16550 *const com_port = dev_get_priv(dev);
	340	struct ns16550_platdata *plat = com_port->plat;
	341	int clock_divisor;
	342
	343	clock_divisor = ns16550_calc_divisor(com_port, plat->clock, baudrate);
	344
	345	NS16550_setbrg(com_port, clock_divisor);
	346
	347	return 0;
	348	}
	349
	350	int ns16550_serial_probe(struct udevice *dev)
	351	{
	352	struct NS16550 *const com_port = dev_get_priv(dev);
	353
11c1a878	354	com_port->plat = dev_get_platdata(dev);
12e431b2 SG	355	NS16550_init(com_port, -1);
	356
	357	return 0;
	358	}
	359
79fd9281 MV	360	#if CONFIG_IS_ENABLED(OF_CONTROL)
	361	enum {
	362	PORT_NS16550 = 0,
0b060eef	363	PORT_JZ4780,
79fd9281 MV	364	};
	365	#endif
	366
b2927fba	367	#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
12e431b2 SG	368	int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
12e431b2 SG	369	{
12e431b2	370	struct ns16550_platdata *plat = dev->platdata;
0b060eef	371	const u32 port_type = dev_get_driver_data(dev);
12e431b2	372	fdt_addr_t addr;
021abf69 MY	373	struct clk clk;
021abf69 MY	374	int err;
12e431b2	375
3db886a5	376	/* try Processor Local Bus device first */
4e9838c1	377	addr = dev_get_addr(dev);
fcc0a877	378	#if defined(CONFIG_PCI) && defined(CONFIG_DM_PCI)
3db886a5 BM	379	if (addr == FDT_ADDR_T_NONE) {
	380	/* then try pci device */
	381	struct fdt_pci_addr pci_addr;
	382	u32 bar;
	383	int ret;
	384
	385	/* we prefer to use a memory-mapped register */
e160f7d4	386	ret = fdtdec_get_pci_addr(gd->fdt_blob, dev_of_offset(dev),
3db886a5 BM	387	FDT_PCI_SPACE_MEM32, "reg",
	388	&pci_addr);
	389	if (ret) {
	390	/* try if there is any i/o-mapped register */
	391	ret = fdtdec_get_pci_addr(gd->fdt_blob,
e160f7d4	392	dev_of_offset(dev),
3db886a5 BM	393	FDT_PCI_SPACE_IO,
	394	"reg", &pci_addr);
	395	if (ret)
	396	return ret;
	397	}
	398
fcc0a877	399	ret = fdtdec_get_pci_bar32(dev, &pci_addr, &bar);
3db886a5 BM	400	if (ret)
	401	return ret;
	402
	403	addr = bar;
	404	}
	405	#endif
	406
12e431b2 SG	407	if (addr == FDT_ADDR_T_NONE)
	408	return -EINVAL;
	409
df8ec55d	410	#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
167efe01	411	plat->base = addr;
df8ec55d PB	412	#else
	413	plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE);
	414	#endif
	415
e160f7d4	416	plat->reg_offset = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
59b35ddd	417	"reg-offset", 0);
e160f7d4	418	plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
80e06146	419	"reg-shift", 0);
50fce1d5 PB	420
	421	err = clk_get_by_index(dev, 0, &clk);
	422	if (!err) {
	423	err = clk_get_rate(&clk);
	424	if (!IS_ERR_VALUE(err))
	425	plat->clock = err;
ab895d6a	426	} else if (err != -ENOENT && err != -ENODEV && err != -ENOSYS) {
50fce1d5 PB	427	debug("ns16550 failed to get clock\n");
	428	return err;
	429	}
	430
	431	if (!plat->clock)
e160f7d4	432	plat->clock = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
50fce1d5 PB	433	"clock-frequency",
50fce1d5 PB	434	CONFIG_SYS_NS16550_CLK);
8e62d32e TC	435	if (!plat->clock) {
	436	debug("ns16550 clock not defined\n");
	437	return -EINVAL;
	438	}
12e431b2	439
17fa0326	440	plat->fcr = UART_FCR_DEFVAL;
0b060eef MV	441	if (port_type == PORT_JZ4780)
0b060eef MV	442	plat->fcr \|= UART_FCR_UME;
65f83802	443
12e431b2 SG	444	return 0;
12e431b2 SG	445	}
11c1a878	446	#endif
12e431b2 SG	447
	448	const struct dm_serial_ops ns16550_serial_ops = {
	449	.putc = ns16550_serial_putc,
	450	.pending = ns16550_serial_pending,
	451	.getc = ns16550_serial_getc,
	452	.setbrg = ns16550_serial_setbrg,
	453	};
8e62d32e	454
b2927fba	455	#if !CONFIG_IS_ENABLED(OF_PLATDATA)
8e62d32e	456	#if CONFIG_IS_ENABLED(OF_CONTROL)
cc4228f9 TC	457	/*
	458	* Please consider existing compatible strings before adding a new
	459	* one to keep this table compact. Or you may add a generic "ns16550"
	460	* compatible string to your dts.
	461	*/
8e62d32e	462	static const struct udevice_id ns16550_serial_ids[] = {
79fd9281 MV	463	{ .compatible = "ns16550", .data = PORT_NS16550 },
79fd9281 MV	464	{ .compatible = "ns16550a", .data = PORT_NS16550 },
0b060eef	465	{ .compatible = "ingenic,jz4780-uart", .data = PORT_JZ4780 },
79fd9281 MV	466	{ .compatible = "nvidia,tegra20-uart", .data = PORT_NS16550 },
	467	{ .compatible = "snps,dw-apb-uart", .data = PORT_NS16550 },
	468	{ .compatible = "ti,omap2-uart", .data = PORT_NS16550 },
	469	{ .compatible = "ti,omap3-uart", .data = PORT_NS16550 },
	470	{ .compatible = "ti,omap4-uart", .data = PORT_NS16550 },
	471	{ .compatible = "ti,am3352-uart", .data = PORT_NS16550 },
	472	{ .compatible = "ti,am4372-uart", .data = PORT_NS16550 },
	473	{ .compatible = "ti,dra742-uart", .data = PORT_NS16550 },
8e62d32e TC	474	{}
	475	};
	476	#endif
	477
b7e29834	478	#if CONFIG_IS_ENABLED(SERIAL_PRESENT)
8e62d32e TC	479	U_BOOT_DRIVER(ns16550_serial) = {
	480	.name = "ns16550_serial",
	481	.id = UCLASS_SERIAL,
	482	#if CONFIG_IS_ENABLED(OF_CONTROL)
	483	.of_match = ns16550_serial_ids,
	484	.ofdata_to_platdata = ns16550_serial_ofdata_to_platdata,
	485	.platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
	486	#endif
	487	.priv_auto_alloc_size = sizeof(struct NS16550),
	488	.probe = ns16550_serial_probe,
	489	.ops = &ns16550_serial_ops,
b7e5a643	490	.flags = DM_FLAG_PRE_RELOC,
8e62d32e	491	};
b7e29834	492	#endif
b2927fba	493	#endif /* !OF_PLATDATA */
12e431b2	494	#endif /* CONFIG_DM_SERIAL */