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139 lines
3.3 KiB
139 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* (C) Copyright 2008 - 2015 Michal Simek <[email protected]> |
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* Clean driver and add xilinx constant from header file |
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* |
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* (C) Copyright 2004 Atmark Techno, Inc. |
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* Yasushi SHOJI <[email protected]> |
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*/ |
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#include <config.h> |
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#include <common.h> |
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#include <dm.h> |
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#include <asm/io.h> |
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#include <linux/compiler.h> |
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#include <serial.h> |
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#define SR_TX_FIFO_FULL BIT(3) /* transmit FIFO full */ |
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#define SR_TX_FIFO_EMPTY BIT(2) /* transmit FIFO empty */ |
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#define SR_RX_FIFO_VALID_DATA BIT(0) /* data in receive FIFO */ |
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#define SR_RX_FIFO_FULL BIT(1) /* receive FIFO full */ |
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#define ULITE_CONTROL_RST_TX 0x01 |
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#define ULITE_CONTROL_RST_RX 0x02 |
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struct uartlite { |
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unsigned int rx_fifo; |
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unsigned int tx_fifo; |
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unsigned int status; |
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unsigned int control; |
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}; |
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struct uartlite_platdata { |
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struct uartlite *regs; |
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}; |
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static int uartlite_serial_putc(struct udevice *dev, const char ch) |
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{ |
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struct uartlite_platdata *plat = dev_get_platdata(dev); |
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struct uartlite *regs = plat->regs; |
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if (in_be32(®s->status) & SR_TX_FIFO_FULL) |
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return -EAGAIN; |
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out_be32(®s->tx_fifo, ch & 0xff); |
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return 0; |
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} |
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static int uartlite_serial_getc(struct udevice *dev) |
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{ |
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struct uartlite_platdata *plat = dev_get_platdata(dev); |
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struct uartlite *regs = plat->regs; |
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if (!(in_be32(®s->status) & SR_RX_FIFO_VALID_DATA)) |
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return -EAGAIN; |
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return in_be32(®s->rx_fifo) & 0xff; |
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} |
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static int uartlite_serial_pending(struct udevice *dev, bool input) |
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{ |
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struct uartlite_platdata *plat = dev_get_platdata(dev); |
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struct uartlite *regs = plat->regs; |
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if (input) |
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return in_be32(®s->status) & SR_RX_FIFO_VALID_DATA; |
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return !(in_be32(®s->status) & SR_TX_FIFO_EMPTY); |
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} |
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static int uartlite_serial_probe(struct udevice *dev) |
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{ |
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struct uartlite_platdata *plat = dev_get_platdata(dev); |
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struct uartlite *regs = plat->regs; |
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out_be32(®s->control, 0); |
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out_be32(®s->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX); |
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in_be32(®s->control); |
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return 0; |
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} |
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static int uartlite_serial_ofdata_to_platdata(struct udevice *dev) |
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{ |
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struct uartlite_platdata *plat = dev_get_platdata(dev); |
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plat->regs = (struct uartlite *)devfdt_get_addr(dev); |
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return 0; |
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} |
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static const struct dm_serial_ops uartlite_serial_ops = { |
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.putc = uartlite_serial_putc, |
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.pending = uartlite_serial_pending, |
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.getc = uartlite_serial_getc, |
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}; |
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static const struct udevice_id uartlite_serial_ids[] = { |
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{ .compatible = "xlnx,opb-uartlite-1.00.b", }, |
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{ .compatible = "xlnx,xps-uartlite-1.00.a" }, |
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{ } |
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}; |
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U_BOOT_DRIVER(serial_uartlite) = { |
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.name = "serial_uartlite", |
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.id = UCLASS_SERIAL, |
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.of_match = uartlite_serial_ids, |
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.ofdata_to_platdata = uartlite_serial_ofdata_to_platdata, |
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.platdata_auto_alloc_size = sizeof(struct uartlite_platdata), |
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.probe = uartlite_serial_probe, |
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.ops = &uartlite_serial_ops, |
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.flags = DM_FLAG_PRE_RELOC, |
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}; |
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#ifdef CONFIG_DEBUG_UART_UARTLITE |
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#include <debug_uart.h> |
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static inline void _debug_uart_init(void) |
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{ |
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struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE; |
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out_be32(®s->control, 0); |
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out_be32(®s->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX); |
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in_be32(®s->control); |
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} |
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static inline void _debug_uart_putc(int ch) |
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{ |
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struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE; |
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while (in_be32(®s->status) & SR_TX_FIFO_FULL) |
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; |
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out_be32(®s->tx_fifo, ch & 0xff); |
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} |
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DEBUG_UART_FUNCS |
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#endif
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