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drivers/serial/serial_meson.c
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// SPDX-License-Identifier: GPL-2.0+ |
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/* * (C) Copyright 2016 Beniamino Galvani <b.galvani@gmail.com> |
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*/ #include <common.h> #include <dm.h> #include <errno.h> #include <fdtdec.h> #include <linux/compiler.h> #include <serial.h> |
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struct meson_uart { u32 wfifo; u32 rfifo; u32 control; u32 status; u32 misc; }; struct meson_serial_platdata { struct meson_uart *reg; }; /* AML_UART_STATUS bits */ #define AML_UART_PARITY_ERR BIT(16) #define AML_UART_FRAME_ERR BIT(17) #define AML_UART_TX_FIFO_WERR BIT(18) #define AML_UART_RX_EMPTY BIT(20) #define AML_UART_TX_FULL BIT(21) #define AML_UART_TX_EMPTY BIT(22) #define AML_UART_XMIT_BUSY BIT(25) #define AML_UART_ERR (AML_UART_PARITY_ERR | \ AML_UART_FRAME_ERR | \ AML_UART_TX_FIFO_WERR) /* AML_UART_CONTROL bits */ #define AML_UART_TX_EN BIT(12) #define AML_UART_RX_EN BIT(13) #define AML_UART_TX_RST BIT(22) #define AML_UART_RX_RST BIT(23) #define AML_UART_CLR_ERR BIT(24) static void meson_serial_init(struct meson_uart *uart) { u32 val; val = readl(&uart->control); val |= (AML_UART_RX_RST | AML_UART_TX_RST | AML_UART_CLR_ERR); writel(val, &uart->control); val &= ~(AML_UART_RX_RST | AML_UART_TX_RST | AML_UART_CLR_ERR); writel(val, &uart->control); val |= (AML_UART_RX_EN | AML_UART_TX_EN); writel(val, &uart->control); } static int meson_serial_probe(struct udevice *dev) { struct meson_serial_platdata *plat = dev->platdata; struct meson_uart *const uart = plat->reg; meson_serial_init(uart); return 0; } static int meson_serial_getc(struct udevice *dev) { struct meson_serial_platdata *plat = dev->platdata; struct meson_uart *const uart = plat->reg; if (readl(&uart->status) & AML_UART_RX_EMPTY) return -EAGAIN; return readl(&uart->rfifo) & 0xff; } static int meson_serial_putc(struct udevice *dev, const char ch) { struct meson_serial_platdata *plat = dev->platdata; struct meson_uart *const uart = plat->reg; if (readl(&uart->status) & AML_UART_TX_FULL) return -EAGAIN; writel(ch, &uart->wfifo); return 0; } static int meson_serial_pending(struct udevice *dev, bool input) { struct meson_serial_platdata *plat = dev->platdata; struct meson_uart *const uart = plat->reg; uint32_t status = readl(&uart->status); if (input) return !(status & AML_UART_RX_EMPTY); else return !(status & AML_UART_TX_FULL); } static int meson_serial_ofdata_to_platdata(struct udevice *dev) { struct meson_serial_platdata *plat = dev->platdata; fdt_addr_t addr; |
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addr = devfdt_get_addr(dev); |
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if (addr == FDT_ADDR_T_NONE) return -EINVAL; plat->reg = (struct meson_uart *)addr; return 0; } static const struct dm_serial_ops meson_serial_ops = { .putc = meson_serial_putc, .pending = meson_serial_pending, .getc = meson_serial_getc, }; static const struct udevice_id meson_serial_ids[] = { { .compatible = "amlogic,meson-uart" }, |
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{ .compatible = "amlogic,meson-gx-uart" }, |
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{ } }; U_BOOT_DRIVER(serial_meson) = { .name = "serial_meson", .id = UCLASS_SERIAL, .of_match = meson_serial_ids, .probe = meson_serial_probe, .ops = &meson_serial_ops, |
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.ofdata_to_platdata = meson_serial_ofdata_to_platdata, .platdata_auto_alloc_size = sizeof(struct meson_serial_platdata), }; #ifdef CONFIG_DEBUG_UART_MESON #include <debug_uart.h> static inline void _debug_uart_init(void) { } static inline void _debug_uart_putc(int ch) { struct meson_uart *regs = (struct meson_uart *)CONFIG_DEBUG_UART_BASE; while (readl(®s->status) & AML_UART_TX_FULL) ; writel(ch, ®s->wfifo); } DEBUG_UART_FUNCS #endif |