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