Lokesh Vutla | 42cb4b8 | 2018-08-27 15:55:24 +0530 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Texas Instruments' OMAP serial driver |
| 4 | * |
| 5 | * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ |
| 6 | * Lokesh Vutla <lokeshvutla@ti.com> |
| 7 | */ |
| 8 | |
| 9 | #include <common.h> |
| 10 | #include <debug_uart.h> |
| 11 | #include <dm.h> |
| 12 | #include <dt-structs.h> |
| 13 | #include <ns16550.h> |
| 14 | #include <serial.h> |
| 15 | #include <clk.h> |
| 16 | |
| 17 | #ifndef CONFIG_SYS_NS16550_CLK |
| 18 | #define CONFIG_SYS_NS16550_CLK 0 |
| 19 | #endif |
| 20 | |
| 21 | #ifdef CONFIG_DEBUG_UART_OMAP |
| 22 | |
| 23 | #include <debug_uart.h> |
| 24 | |
| 25 | static inline void _debug_uart_init(void) |
| 26 | { |
| 27 | struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE; |
| 28 | int baud_divisor; |
| 29 | |
| 30 | baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK, |
| 31 | CONFIG_BAUDRATE); |
| 32 | serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER); |
| 33 | serial_dout(&com_port->mdr1, 0x7); |
| 34 | serial_dout(&com_port->mcr, UART_MCRVAL); |
| 35 | serial_dout(&com_port->fcr, UART_FCR_DEFVAL); |
| 36 | |
| 37 | serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL); |
| 38 | serial_dout(&com_port->dll, baud_divisor & 0xff); |
| 39 | serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff); |
| 40 | serial_dout(&com_port->lcr, UART_LCRVAL); |
| 41 | serial_dout(&com_port->mdr1, 0x0); |
| 42 | } |
| 43 | |
| 44 | static inline void _debug_uart_putc(int ch) |
| 45 | { |
| 46 | struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE; |
| 47 | |
| 48 | while (!(serial_din(&com_port->lsr) & UART_LSR_THRE)) |
| 49 | ; |
| 50 | serial_dout(&com_port->thr, ch); |
| 51 | } |
| 52 | |
| 53 | DEBUG_UART_FUNCS |
| 54 | |
| 55 | #endif |
| 56 | |
| 57 | #if CONFIG_IS_ENABLED(DM_SERIAL) |
| 58 | |
| 59 | #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA) |
| 60 | static int omap_serial_ofdata_to_platdata(struct udevice *dev) |
| 61 | { |
| 62 | struct ns16550_platdata *plat = dev->platdata; |
| 63 | fdt_addr_t addr; |
| 64 | struct clk clk; |
| 65 | int err; |
| 66 | |
| 67 | /* try Processor Local Bus device first */ |
| 68 | addr = dev_read_addr(dev); |
| 69 | if (addr == FDT_ADDR_T_NONE) |
| 70 | return -EINVAL; |
| 71 | |
| 72 | plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE); |
| 73 | |
| 74 | plat->reg_offset = dev_read_u32_default(dev, "reg-offset", 0); |
| 75 | plat->reg_shift = 2; |
| 76 | |
| 77 | err = clk_get_by_index(dev, 0, &clk); |
| 78 | if (!err) { |
| 79 | err = clk_get_rate(&clk); |
| 80 | if (!IS_ERR_VALUE(err)) |
| 81 | plat->clock = err; |
| 82 | } else if (err != -ENOENT && err != -ENODEV && err != -ENOSYS) { |
| 83 | debug("omap serial failed to get clock\n"); |
| 84 | return err; |
| 85 | } |
| 86 | |
| 87 | if (!plat->clock) |
| 88 | plat->clock = dev_read_u32_default(dev, "clock-frequency", |
| 89 | CONFIG_SYS_NS16550_CLK); |
| 90 | if (!plat->clock) { |
| 91 | debug("omap serial clock not defined\n"); |
| 92 | return -EINVAL; |
| 93 | } |
| 94 | |
| 95 | plat->fcr = UART_FCR_DEFVAL; |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | static const struct udevice_id omap_serial_ids[] = { |
| 101 | { .compatible = "ti,omap2-uart", }, |
| 102 | { .compatible = "ti,omap3-uart", }, |
| 103 | { .compatible = "ti,omap4-uart", }, |
| 104 | { .compatible = "ti,am3352-uart", }, |
| 105 | { .compatible = "ti,am4372-uart", }, |
| 106 | { .compatible = "ti,dra742-uart", }, |
Lokesh Vutla | 324a9a1 | 2018-09-14 19:43:35 +0530 | [diff] [blame] | 107 | { .compatible = "ti,am654-uart", }, |
Lokesh Vutla | 42cb4b8 | 2018-08-27 15:55:24 +0530 | [diff] [blame] | 108 | {} |
| 109 | }; |
| 110 | #endif /* OF_CONTROL && !OF_PLATDATA */ |
| 111 | |
| 112 | #if CONFIG_IS_ENABLED(SERIAL_PRESENT) |
| 113 | U_BOOT_DRIVER(omap_serial) = { |
| 114 | .name = "omap_serial", |
| 115 | .id = UCLASS_SERIAL, |
| 116 | #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA) |
| 117 | .of_match = omap_serial_ids, |
| 118 | .ofdata_to_platdata = omap_serial_ofdata_to_platdata, |
| 119 | .platdata_auto_alloc_size = sizeof(struct ns16550_platdata), |
| 120 | #endif |
| 121 | .priv_auto_alloc_size = sizeof(struct NS16550), |
| 122 | .probe = ns16550_serial_probe, |
| 123 | .ops = &ns16550_serial_ops, |
Bin Meng | bdb33d8 | 2018-10-24 06:36:36 -0700 | [diff] [blame] | 124 | #if !CONFIG_IS_ENABLED(OF_CONTROL) |
Lokesh Vutla | 42cb4b8 | 2018-08-27 15:55:24 +0530 | [diff] [blame] | 125 | .flags = DM_FLAG_PRE_RELOC, |
Bin Meng | bdb33d8 | 2018-10-24 06:36:36 -0700 | [diff] [blame] | 126 | #endif |
Lokesh Vutla | 42cb4b8 | 2018-08-27 15:55:24 +0530 | [diff] [blame] | 127 | }; |
| 128 | #endif |
| 129 | #endif /* DM_SERIAL */ |