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- /*
- * COM1 NS16550 support
- * originally from linux source (arch/powerpc/boot/ns16550.c)
- * modified to use CONFIG_SYS_ISA_MEM and new defines
- */
- #include <clock_legacy.h>
- #include <common.h>
- #include <clk.h>
- #include <dm.h>
- #include <errno.h>
- #include <log.h>
- #include <ns16550.h>
- #include <reset.h>
- #include <serial.h>
- #include <watchdog.h>
- #include <linux/err.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 */
- #if !CONFIG_IS_ENABLED(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_LITTLE_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_LITTLE_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
- }
- #if CONFIG_IS_ENABLED(DM_SERIAL)
- #ifndef CONFIG_SYS_NS16550_CLK
- #define CONFIG_SYS_NS16550_CLK 0
- #endif
- /*
- * Use this #ifdef for now since many platforms don't define in(), out(),
- * out_le32(), etc. but we don't have #defines to indicate this.
- *
- * TODO(sjg@chromium.org): Add CONFIG options to indicate what I/O is available
- * on a platform
- */
- #ifdef CONFIG_NS16550_DYNAMIC
- static void serial_out_dynamic(struct ns16550_platdata *plat, u8 *addr,
- int value)
- {
- if (plat->flags & NS16550_FLAG_IO) {
- outb(value, addr);
- } else if (plat->reg_width == 4) {
- if (plat->flags & NS16550_FLAG_ENDIAN) {
- if (plat->flags & NS16550_FLAG_BE)
- out_be32(addr, value);
- else
- out_le32(addr, value);
- } else {
- writel(value, addr);
- }
- } else if (plat->flags & NS16550_FLAG_BE) {
- writeb(value, addr + (1 << plat->reg_shift) - 1);
- } else {
- writeb(value, addr);
- }
- }
- static int serial_in_dynamic(struct ns16550_platdata *plat, u8 *addr)
- {
- if (plat->flags & NS16550_FLAG_IO) {
- return inb(addr);
- } else if (plat->reg_width == 4) {
- if (plat->flags & NS16550_FLAG_ENDIAN) {
- if (plat->flags & NS16550_FLAG_BE)
- return in_be32(addr);
- else
- return in_le32(addr);
- } else {
- return readl(addr);
- }
- } else if (plat->flags & NS16550_FLAG_BE) {
- return readb(addr + (1 << plat->reg_shift) - 1);
- } else {
- return readb(addr);
- }
- }
- #else
- static inline void serial_out_dynamic(struct ns16550_platdata *plat, u8 *addr,
- int value)
- {
- }
- static inline int serial_in_dynamic(struct ns16550_platdata *plat, u8 *addr)
- {
- return 0;
- }
- #endif /* CONFIG_NS16550_DYNAMIC */
- 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 + plat->reg_offset;
- if (IS_ENABLED(CONFIG_NS16550_DYNAMIC))
- serial_out_dynamic(plat, addr, value);
- else
- serial_out_shift(addr, 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 + plat->reg_offset;
- if (IS_ENABLED(CONFIG_NS16550_DYNAMIC))
- return serial_in_dynamic(plat, addr);
- else
- return serial_in_shift(addr, 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)
- {
- /* to keep serial format, read lcr before writing BKSE */
- int lcr_val = serial_in(&com_port->lcr) & ~UART_LCR_BKSE;
- serial_out(UART_LCR_BKSE | lcr_val, &com_port->lcr);
- serial_out(baud_divisor & 0xff, &com_port->dll);
- serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
- serial_out(lcr_val, &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);
- else {
- // Re-use old baud rate divisor to flush transmit reg.
- const int dll = serial_in(&com_port->dll);
- const int dlm = serial_in(&com_port->dlm);
- const int divisor = dll | (dlm << 8);
- NS16550_setbrg(com_port, 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_ARCH_OMAP2PLUS) || defined(CONFIG_OMAP_SERIAL)
- 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);
- /* initialize serial config to 8N1 before writing baudrate */
- serial_out(UART_LCRVAL, &com_port->lcr);
- if (baud_divisor != -1)
- NS16550_setbrg(com_port, baud_divisor);
- #if defined(CONFIG_ARCH_OMAP2PLUS) || defined(CONFIG_SOC_DA8XX) || \
- defined(CONFIG_OMAP_SERIAL)
- /* /16 is proper to hit 115200 with 48MHz */
- serial_out(0, &com_port->mdr1);
- #endif
- #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>
- 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 int NS16550_read_baud_divisor(struct NS16550 *com_port)
- {
- int ret;
- serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
- ret = serial_din(&com_port->dll) & 0xff;
- ret |= (serial_din(&com_port->dlm) & 0xff) << 8;
- serial_dout(&com_port->lcr, UART_LCRVAL);
- return ret;
- }
- 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)) {
- #ifdef CONFIG_DEBUG_UART_NS16550_CHECK_ENABLED
- if (!NS16550_read_baud_divisor(com_port))
- return;
- #endif
- }
- serial_dout(&com_port->thr, ch);
- }
- DEBUG_UART_FUNCS
- #endif
- #if CONFIG_IS_ENABLED(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;
- }
- static int ns16550_serial_setconfig(struct udevice *dev, uint serial_config)
- {
- struct NS16550 *const com_port = dev_get_priv(dev);
- int lcr_val = UART_LCR_WLS_8;
- uint parity = SERIAL_GET_PARITY(serial_config);
- uint bits = SERIAL_GET_BITS(serial_config);
- uint stop = SERIAL_GET_STOP(serial_config);
- /*
- * only parity config is implemented, check if other serial settings
- * are the default one.
- */
- if (bits != SERIAL_8_BITS || stop != SERIAL_ONE_STOP)
- return -ENOTSUPP; /* not supported in driver*/
- switch (parity) {
- case SERIAL_PAR_NONE:
- /* no bits to add */
- break;
- case SERIAL_PAR_ODD:
- lcr_val |= UART_LCR_PEN;
- break;
- case SERIAL_PAR_EVEN:
- lcr_val |= UART_LCR_PEN | UART_LCR_EPS;
- break;
- default:
- return -ENOTSUPP; /* not supported in driver*/
- }
- serial_out(lcr_val, &com_port->lcr);
- return 0;
- }
- static int ns16550_serial_getinfo(struct udevice *dev,
- struct serial_device_info *info)
- {
- struct NS16550 *const com_port = dev_get_priv(dev);
- struct ns16550_platdata *plat = com_port->plat;
- info->type = SERIAL_CHIP_16550_COMPATIBLE;
- #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
- info->addr_space = SERIAL_ADDRESS_SPACE_IO;
- #else
- info->addr_space = SERIAL_ADDRESS_SPACE_MEMORY;
- #endif
- info->addr = plat->base;
- info->reg_width = plat->reg_width;
- info->reg_shift = plat->reg_shift;
- info->reg_offset = plat->reg_offset;
- info->clock = plat->clock;
- return 0;
- }
- static int ns16550_serial_assign_base(struct ns16550_platdata *plat, ulong base)
- {
- if (base == FDT_ADDR_T_NONE)
- return -EINVAL;
- #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
- plat->base = base;
- #else
- plat->base = (unsigned long)map_physmem(base, 0, MAP_NOCACHE);
- #endif
- return 0;
- }
- int ns16550_serial_probe(struct udevice *dev)
- {
- struct ns16550_platdata *plat = dev->platdata;
- struct NS16550 *const com_port = dev_get_priv(dev);
- struct reset_ctl_bulk reset_bulk;
- fdt_addr_t addr;
- int ret;
- /*
- * If we are on PCI bus, either directly attached to a PCI root port,
- * or via a PCI bridge, assign platdata->base before probing hardware.
- */
- if (device_is_on_pci_bus(dev)) {
- addr = devfdt_get_addr_pci(dev);
- ret = ns16550_serial_assign_base(plat, addr);
- if (ret)
- return ret;
- }
- ret = reset_get_bulk(dev, &reset_bulk);
- if (!ret)
- reset_deassert_bulk(&reset_bulk);
- 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;
- addr = dev_read_addr(dev);
- err = ns16550_serial_assign_base(plat, addr);
- if (err && !device_is_on_pci_bus(dev))
- return err;
- plat->reg_offset = dev_read_u32_default(dev, "reg-offset", 0);
- plat->reg_shift = dev_read_u32_default(dev, "reg-shift", 0);
- plat->reg_width = dev_read_u32_default(dev, "reg-io-width", 1);
- 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 = dev_read_u32_default(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,
- .setconfig = ns16550_serial_setconfig,
- .getinfo = ns16550_serial_getinfo,
- };
- #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
- /*
- * 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 },
- {}
- };
- #endif /* OF_CONTROL && !OF_PLATDATA */
- #if CONFIG_IS_ENABLED(SERIAL_PRESENT)
- /* TODO(sjg@chromium.org): Integrate this into a macro like CONFIG_IS_ENABLED */
- #if !defined(CONFIG_TPL_BUILD) || defined(CONFIG_TPL_DM_SERIAL)
- U_BOOT_DRIVER(ns16550_serial) = {
- .name = "ns16550_serial",
- .id = UCLASS_SERIAL,
- #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
- .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,
- #if !CONFIG_IS_ENABLED(OF_CONTROL)
- .flags = DM_FLAG_PRE_RELOC,
- #endif
- };
- U_BOOT_DRIVER_ALIAS(ns16550_serial, rockchip_rk3328_uart)
- U_BOOT_DRIVER_ALIAS(ns16550_serial, rockchip_rk3368_uart)
- U_BOOT_DRIVER_ALIAS(ns16550_serial, ti_da830_uart)
- #endif
- #endif /* SERIAL_PRESENT */
- #endif /* CONFIG_DM_SERIAL */
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