drivers/serial/serial_omap.c

   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 <dm.h>
  11 #include <dt-structs.h>
  12 #include <ns16550.h>
  13 #include <serial.h>
  14 #include <clk.h>
  15
  16 #ifndef CONFIG_SYS_NS16550_CLK
  17 #define CONFIG_SYS_NS16550_CLK  0
  18 #endif
  19
  20 #ifdef CONFIG_DEBUG_UART_OMAP
  21
  22 #ifndef CONFIG_SYS_NS16550_IER
  23 #define CONFIG_SYS_NS16550_IER  0x00
  24 #endif
  25
  26 #define UART_MCRVAL 0x00
  27 #define UART_LCRVAL UART_LCR_8N1
  28
  29 static inline void serial_out_shift(void *addr, int shift, int value)
  30 {
  31 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
  32         outb(value, (ulong)addr);
  33 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_LITTLE_ENDIAN)
  34         out_le32(addr, value);
  35 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
  36         out_be32(addr, value);
  37 #elif defined(CONFIG_SYS_NS16550_MEM32)
  38         writel(value, addr);
  39 #elif defined(CONFIG_SYS_BIG_ENDIAN)
  40         writeb(value, addr + (1 << shift) - 1);
  41 #else
  42         writeb(value, addr);
  43 #endif
  44 }
  45
  46 static inline int serial_in_shift(void *addr, int shift)
  47 {
  48 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
  49         return inb((ulong)addr);
  50 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_LITTLE_ENDIAN)
  51         return in_le32(addr);
  52 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
  53         return in_be32(addr);
  54 #elif defined(CONFIG_SYS_NS16550_MEM32)
  55         return readl(addr);
  56 #elif defined(CONFIG_SYS_BIG_ENDIAN)
  57         return readb(addr + (1 << shift) - 1);
  58 #else
  59         return readb(addr);
  60 #endif
  61 }
  62
  63 #include <debug_uart.h>
  64
  65 static inline void _debug_uart_init(void)
  66 {
  67         struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
  68         int baud_divisor;
  69
  70         baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
  71                                             CONFIG_BAUDRATE);
  72         serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
  73         serial_dout(&com_port->mdr1, 0x7);
  74         serial_dout(&com_port->mcr, UART_MCRVAL);
  75         serial_dout(&com_port->fcr, UART_FCR_DEFVAL);
  76
  77         serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
  78         serial_dout(&com_port->dll, baud_divisor & 0xff);
  79         serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
  80         serial_dout(&com_port->lcr, UART_LCRVAL);
  81         serial_dout(&com_port->mdr1, 0x0);
  82 }
  83
  84 static inline void _debug_uart_putc(int ch)
  85 {
  86         struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
  87
  88         while (!(serial_din(&com_port->lsr) & UART_LSR_THRE))
  89                 ;
  90         serial_dout(&com_port->thr, ch);
  91 }
  92
  93 DEBUG_UART_FUNCS
  94
  95 #endif
  96
  97 #if CONFIG_IS_ENABLED(DM_SERIAL)
  98
  99 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
 100 static int omap_serial_ofdata_to_platdata(struct udevice *dev)
 101 {
 102         struct ns16550_platdata *plat = dev->platdata;
 103         fdt_addr_t addr;
 104         struct clk clk;
 105         int err;
 106
 107         /* try Processor Local Bus device first */
 108         addr = dev_read_addr(dev);
 109         if (addr == FDT_ADDR_T_NONE)
 110                 return -EINVAL;
 111
 112         plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE);
 113
 114         plat->reg_offset = dev_read_u32_default(dev, "reg-offset", 0);
 115         plat->reg_shift = 2;
 116
 117         err = clk_get_by_index(dev, 0, &clk);
 118         if (!err) {
 119                 err = clk_get_rate(&clk);
 120                 if (!IS_ERR_VALUE(err))
 121                         plat->clock = err;
 122         } else if (err != -ENOENT && err != -ENODEV && err != -ENOSYS) {
 123                 debug("omap serial failed to get clock\n");
 124                 return err;
 125         }
 126
 127         if (!plat->clock)
 128                 plat->clock = dev_read_u32_default(dev, "clock-frequency",
 129                                                    CONFIG_SYS_NS16550_CLK);
 130         if (!plat->clock) {
 131                 debug("omap serial clock not defined\n");
 132                 return -EINVAL;
 133         }
 134
 135         plat->fcr = UART_FCR_DEFVAL;
 136
 137         return 0;
 138 }
 139
 140 static const struct udevice_id omap_serial_ids[] = {
 141         { .compatible = "ti,omap2-uart", },
 142         { .compatible = "ti,omap3-uart", },
 143         { .compatible = "ti,omap4-uart", },
 144         { .compatible = "ti,am3352-uart", },
 145         { .compatible = "ti,am4372-uart", },
 146         { .compatible = "ti,dra742-uart", },
 147         { .compatible = "ti,am654-uart", },
 148         {}
 149 };
 150 #endif /* OF_CONTROL && !OF_PLATDATA */
 151
 152 #if CONFIG_IS_ENABLED(SERIAL_PRESENT)
 153 U_BOOT_DRIVER(omap_serial) = {
 154         .name   = "omap_serial",
 155         .id     = UCLASS_SERIAL,
 156 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
 157         .of_match = omap_serial_ids,
 158         .ofdata_to_platdata = omap_serial_ofdata_to_platdata,
 159         .platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
 160 #endif
 161         .priv_auto_alloc_size = sizeof(struct NS16550),
 162         .probe = ns16550_serial_probe,
 163         .ops    = &ns16550_serial_ops,
 164 #if !CONFIG_IS_ENABLED(OF_CONTROL)
 165         .flags  = DM_FLAG_PRE_RELOC,
 166 #endif
 167 };
 168 #endif
 169 #endif /* DM_SERIAL */