2 * Copyright (C) 2012-2014 Panasonic Corporation
3 * Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
5 * SPDX-License-Identifier: GPL-2.0+
8 #include <linux/serial_reg.h>
10 #include <asm/errno.h>
11 #include <dm/device.h>
12 #include <dm/platform_data/serial-uniphier.h>
21 * Note: Register map is slightly different from that of 16550.
23 struct uniphier_serial {
24 UART_REG(rbr); /* 0x00 */
25 UART_REG(ier); /* 0x04 */
26 UART_REG(iir); /* 0x08 */
27 UART_REG(fcr); /* 0x0c */
31 UART_REG(lsr); /* 0x14 */
32 UART_REG(msr); /* 0x18 */
41 struct uniphier_serial_private_data {
42 struct uniphier_serial __iomem *membase;
45 #define uniphier_serial_port(dev) \
46 ((struct uniphier_serial_private_data *)dev_get_priv(dev))->membase
48 static int uniphier_serial_setbrg(struct udevice *dev, int baudrate)
50 struct uniphier_serial_platform_data *plat = dev_get_platdata(dev);
51 struct uniphier_serial __iomem *port = uniphier_serial_port(dev);
52 const unsigned int mode_x_div = 16;
55 writeb(UART_LCR_WLEN8, &port->lcr);
57 divisor = DIV_ROUND_CLOSEST(plat->uartclk, mode_x_div * baudrate);
59 writew(divisor, &port->dlr);
64 static int uniphier_serial_getc(struct udevice *dev)
66 struct uniphier_serial __iomem *port = uniphier_serial_port(dev);
68 if (!(readb(&port->lsr) & UART_LSR_DR))
71 return readb(&port->rbr);
74 static int uniphier_serial_putc(struct udevice *dev, const char c)
76 struct uniphier_serial __iomem *port = uniphier_serial_port(dev);
78 if (!(readb(&port->lsr) & UART_LSR_THRE))
81 writeb(c, &port->thr);
86 static int uniphier_serial_pending(struct udevice *dev, bool input)
88 struct uniphier_serial __iomem *port = uniphier_serial_port(dev);
91 return readb(&port->lsr) & UART_LSR_DR;
93 return !(readb(&port->lsr) & UART_LSR_THRE);
96 static int uniphier_serial_probe(struct udevice *dev)
98 struct uniphier_serial_private_data *priv = dev_get_priv(dev);
99 struct uniphier_serial_platform_data *plat = dev_get_platdata(dev);
101 priv->membase = map_sysmem(plat->base, sizeof(struct uniphier_serial));
109 static int uniphier_serial_remove(struct udevice *dev)
111 unmap_sysmem(uniphier_serial_port(dev));
116 #ifdef CONFIG_OF_CONTROL
117 static const struct udevice_id uniphier_uart_of_match[] = {
118 { .compatible = "panasonic,uniphier-uart" },
122 static int uniphier_serial_ofdata_to_platdata(struct udevice *dev)
124 struct uniphier_serial_platform_data *plat = dev_get_platdata(dev);
125 DECLARE_GLOBAL_DATA_PTR;
127 plat->base = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
128 plat->uartclk = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
129 "clock-frequency", 0);
135 static const struct dm_serial_ops uniphier_serial_ops = {
136 .setbrg = uniphier_serial_setbrg,
137 .getc = uniphier_serial_getc,
138 .putc = uniphier_serial_putc,
139 .pending = uniphier_serial_pending,
142 U_BOOT_DRIVER(uniphier_serial) = {
145 .of_match = of_match_ptr(uniphier_uart_of_match),
146 .ofdata_to_platdata = of_match_ptr(uniphier_serial_ofdata_to_platdata),
147 .probe = uniphier_serial_probe,
148 .remove = uniphier_serial_remove,
149 .priv_auto_alloc_size = sizeof(struct uniphier_serial_private_data),
150 .platdata_auto_alloc_size =
151 sizeof(struct uniphier_serial_platform_data),
152 .ops = &uniphier_serial_ops,
153 .flags = DM_FLAG_PRE_RELOC,