| /* |
| * Copyright (C) 2012-2014 Panasonic Corporation |
| * Author: Masahiro Yamada <yamada.m@jp.panasonic.com> |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <linux/serial_reg.h> |
| #include <asm/io.h> |
| #include <asm/errno.h> |
| #include <dm/device.h> |
| #include <dm/platform_data/serial-uniphier.h> |
| #include <serial.h> |
| #include <fdtdec.h> |
| |
| #define UART_REG(x) \ |
| u8 x; \ |
| u8 postpad_##x[3]; |
| |
| /* |
| * Note: Register map is slightly different from that of 16550. |
| */ |
| struct uniphier_serial { |
| UART_REG(rbr); /* 0x00 */ |
| UART_REG(ier); /* 0x04 */ |
| UART_REG(iir); /* 0x08 */ |
| UART_REG(fcr); /* 0x0c */ |
| u8 mcr; /* 0x10 */ |
| u8 lcr; |
| u16 __postpad; |
| UART_REG(lsr); /* 0x14 */ |
| UART_REG(msr); /* 0x18 */ |
| u32 __none1; |
| u32 __none2; |
| u16 dlr; |
| u16 __postpad2; |
| }; |
| |
| #define thr rbr |
| |
| struct uniphier_serial_private_data { |
| struct uniphier_serial __iomem *membase; |
| }; |
| |
| #define uniphier_serial_port(dev) \ |
| ((struct uniphier_serial_private_data *)dev_get_priv(dev))->membase |
| |
| static int uniphier_serial_setbrg(struct udevice *dev, int baudrate) |
| { |
| struct uniphier_serial_platform_data *plat = dev_get_platdata(dev); |
| struct uniphier_serial __iomem *port = uniphier_serial_port(dev); |
| const unsigned int mode_x_div = 16; |
| unsigned int divisor; |
| |
| writeb(UART_LCR_WLEN8, &port->lcr); |
| |
| divisor = DIV_ROUND_CLOSEST(plat->uartclk, mode_x_div * baudrate); |
| |
| writew(divisor, &port->dlr); |
| |
| return 0; |
| } |
| |
| static int uniphier_serial_getc(struct udevice *dev) |
| { |
| struct uniphier_serial __iomem *port = uniphier_serial_port(dev); |
| |
| if (!(readb(&port->lsr) & UART_LSR_DR)) |
| return -EAGAIN; |
| |
| return readb(&port->rbr); |
| } |
| |
| static int uniphier_serial_putc(struct udevice *dev, const char c) |
| { |
| struct uniphier_serial __iomem *port = uniphier_serial_port(dev); |
| |
| if (!(readb(&port->lsr) & UART_LSR_THRE)) |
| return -EAGAIN; |
| |
| writeb(c, &port->thr); |
| |
| return 0; |
| } |
| |
| static int uniphier_serial_pending(struct udevice *dev, bool input) |
| { |
| struct uniphier_serial __iomem *port = uniphier_serial_port(dev); |
| |
| if (input) |
| return readb(&port->lsr) & UART_LSR_DR; |
| else |
| return !(readb(&port->lsr) & UART_LSR_THRE); |
| } |
| |
| static int uniphier_serial_probe(struct udevice *dev) |
| { |
| struct uniphier_serial_private_data *priv = dev_get_priv(dev); |
| struct uniphier_serial_platform_data *plat = dev_get_platdata(dev); |
| |
| priv->membase = map_sysmem(plat->base, sizeof(struct uniphier_serial)); |
| |
| if (!priv->membase) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static int uniphier_serial_remove(struct udevice *dev) |
| { |
| unmap_sysmem(uniphier_serial_port(dev)); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_OF_CONTROL |
| static const struct udevice_id uniphier_uart_of_match[] = { |
| { .compatible = "panasonic,uniphier-uart" }, |
| {}, |
| }; |
| |
| static int uniphier_serial_ofdata_to_platdata(struct udevice *dev) |
| { |
| struct uniphier_serial_platform_data *plat = dev_get_platdata(dev); |
| DECLARE_GLOBAL_DATA_PTR; |
| |
| plat->base = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg"); |
| plat->uartclk = fdtdec_get_int(gd->fdt_blob, dev->of_offset, |
| "clock-frequency", 0); |
| |
| return 0; |
| } |
| #endif |
| |
| static const struct dm_serial_ops uniphier_serial_ops = { |
| .setbrg = uniphier_serial_setbrg, |
| .getc = uniphier_serial_getc, |
| .putc = uniphier_serial_putc, |
| .pending = uniphier_serial_pending, |
| }; |
| |
| U_BOOT_DRIVER(uniphier_serial) = { |
| .name = DRIVER_NAME, |
| .id = UCLASS_SERIAL, |
| .of_match = of_match_ptr(uniphier_uart_of_match), |
| .ofdata_to_platdata = of_match_ptr(uniphier_serial_ofdata_to_platdata), |
| .probe = uniphier_serial_probe, |
| .remove = uniphier_serial_remove, |
| .priv_auto_alloc_size = sizeof(struct uniphier_serial_private_data), |
| .platdata_auto_alloc_size = |
| sizeof(struct uniphier_serial_platform_data), |
| .ops = &uniphier_serial_ops, |
| .flags = DM_FLAG_PRE_RELOC, |
| }; |