| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Texas Instruments' OMAP serial driver |
| * |
| * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ |
| * Lokesh Vutla <lokeshvutla@ti.com> |
| */ |
| |
| #include <common.h> |
| #include <dm.h> |
| #include <dt-structs.h> |
| #include <log.h> |
| #include <ns16550.h> |
| #include <serial.h> |
| #include <clk.h> |
| #include <linux/err.h> |
| |
| #ifndef CONFIG_SYS_NS16550_CLK |
| #define CONFIG_SYS_NS16550_CLK 0 |
| #endif |
| |
| #ifdef CONFIG_DEBUG_UART_OMAP |
| |
| #ifndef CONFIG_SYS_NS16550_IER |
| #define CONFIG_SYS_NS16550_IER 0x00 |
| #endif |
| |
| #define UART_MCRVAL 0x00 |
| #define UART_LCRVAL UART_LCR_8N1 |
| |
| 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 |
| } |
| |
| #include <debug_uart.h> |
| |
| static inline void _debug_uart_init(void) |
| { |
| struct ns16550 *com_port = (struct ns16550 *)CONFIG_VAL(DEBUG_UART_BASE); |
| int baud_divisor; |
| |
| 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->mdr1, 0x7); |
| 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); |
| serial_dout(&com_port->mdr1, 0x0); |
| } |
| |
| static inline void _debug_uart_putc(int ch) |
| { |
| struct ns16550 *com_port = (struct ns16550 *)CONFIG_VAL(DEBUG_UART_BASE); |
| |
| while (!(serial_din(&com_port->lsr) & UART_LSR_THRE)) |
| ; |
| serial_dout(&com_port->thr, ch); |
| } |
| |
| DEBUG_UART_FUNCS |
| |
| #endif |
| |
| #if CONFIG_IS_ENABLED(DM_SERIAL) |
| |
| #if CONFIG_IS_ENABLED(OF_REAL) |
| static int omap_serial_of_to_plat(struct udevice *dev) |
| { |
| struct ns16550_plat *plat = dev_get_plat(dev); |
| fdt_addr_t addr; |
| struct clk clk; |
| int err; |
| |
| /* try Processor Local Bus device first */ |
| addr = dev_read_addr(dev); |
| if (addr == FDT_ADDR_T_NONE) |
| return -EINVAL; |
| |
| plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE); |
| |
| plat->reg_offset = dev_read_u32_default(dev, "reg-offset", 0); |
| plat->reg_shift = 2; |
| |
| 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("omap serial 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("omap serial clock not defined\n"); |
| return -EINVAL; |
| } |
| |
| plat->fcr = UART_FCR_DEFVAL; |
| |
| return 0; |
| } |
| |
| static const struct udevice_id omap_serial_ids[] = { |
| { .compatible = "ti,omap2-uart", }, |
| { .compatible = "ti,omap3-uart", }, |
| { .compatible = "ti,omap4-uart", }, |
| { .compatible = "ti,am3352-uart", }, |
| { .compatible = "ti,am4372-uart", }, |
| { .compatible = "ti,dra742-uart", }, |
| { .compatible = "ti,am654-uart", }, |
| {} |
| }; |
| #endif /* OF_REAL */ |
| |
| #if CONFIG_IS_ENABLED(SERIAL_PRESENT) |
| U_BOOT_DRIVER(omap_serial) = { |
| .name = "omap_serial", |
| .id = UCLASS_SERIAL, |
| #if CONFIG_IS_ENABLED(OF_REAL) |
| .of_match = omap_serial_ids, |
| .of_to_plat = omap_serial_of_to_plat, |
| .plat_auto = sizeof(struct ns16550_plat), |
| #endif |
| .priv_auto = sizeof(struct ns16550), |
| .probe = ns16550_serial_probe, |
| .ops = &ns16550_serial_ops, |
| #if !CONFIG_IS_ENABLED(OF_CONTROL) |
| .flags = DM_FLAG_PRE_RELOC, |
| #endif |
| }; |
| #endif |
| #endif /* DM_SERIAL */ |