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152 lines
3.3 KiB
152 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* (C) Copyright 2004, Psyent Corporation <www.psyent.com> |
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* Scott McNutt <[email protected]> |
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*/ |
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#include <common.h> |
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#include <dm.h> |
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#include <errno.h> |
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#include <serial.h> |
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#include <asm/io.h> |
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DECLARE_GLOBAL_DATA_PTR; |
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/* status register */ |
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#define ALTERA_UART_TMT BIT(5) /* tx empty */ |
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#define ALTERA_UART_TRDY BIT(6) /* tx ready */ |
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#define ALTERA_UART_RRDY BIT(7) /* rx ready */ |
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struct altera_uart_regs { |
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u32 rxdata; /* Rx data reg */ |
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u32 txdata; /* Tx data reg */ |
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u32 status; /* Status reg */ |
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u32 control; /* Control reg */ |
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u32 divisor; /* Baud rate divisor reg */ |
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u32 endofpacket; /* End-of-packet reg */ |
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}; |
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struct altera_uart_platdata { |
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struct altera_uart_regs *regs; |
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unsigned int uartclk; |
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}; |
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static int altera_uart_setbrg(struct udevice *dev, int baudrate) |
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{ |
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struct altera_uart_platdata *plat = dev->platdata; |
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struct altera_uart_regs *const regs = plat->regs; |
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u32 div; |
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div = (plat->uartclk / baudrate) - 1; |
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writel(div, ®s->divisor); |
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return 0; |
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} |
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static int altera_uart_putc(struct udevice *dev, const char ch) |
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{ |
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struct altera_uart_platdata *plat = dev->platdata; |
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struct altera_uart_regs *const regs = plat->regs; |
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if (!(readl(®s->status) & ALTERA_UART_TRDY)) |
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return -EAGAIN; |
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writel(ch, ®s->txdata); |
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return 0; |
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} |
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static int altera_uart_pending(struct udevice *dev, bool input) |
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{ |
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struct altera_uart_platdata *plat = dev->platdata; |
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struct altera_uart_regs *const regs = plat->regs; |
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u32 st = readl(®s->status); |
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if (input) |
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return st & ALTERA_UART_RRDY ? 1 : 0; |
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else |
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return !(st & ALTERA_UART_TMT); |
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} |
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static int altera_uart_getc(struct udevice *dev) |
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{ |
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struct altera_uart_platdata *plat = dev->platdata; |
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struct altera_uart_regs *const regs = plat->regs; |
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if (!(readl(®s->status) & ALTERA_UART_RRDY)) |
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return -EAGAIN; |
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return readl(®s->rxdata) & 0xff; |
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} |
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static int altera_uart_probe(struct udevice *dev) |
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{ |
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return 0; |
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} |
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static int altera_uart_ofdata_to_platdata(struct udevice *dev) |
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{ |
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struct altera_uart_platdata *plat = dev_get_platdata(dev); |
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plat->regs = map_physmem(devfdt_get_addr(dev), |
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sizeof(struct altera_uart_regs), |
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MAP_NOCACHE); |
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plat->uartclk = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), |
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"clock-frequency", 0); |
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return 0; |
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} |
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static const struct dm_serial_ops altera_uart_ops = { |
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.putc = altera_uart_putc, |
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.pending = altera_uart_pending, |
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.getc = altera_uart_getc, |
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.setbrg = altera_uart_setbrg, |
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}; |
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static const struct udevice_id altera_uart_ids[] = { |
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{ .compatible = "altr,uart-1.0" }, |
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{} |
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}; |
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U_BOOT_DRIVER(altera_uart) = { |
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.name = "altera_uart", |
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.id = UCLASS_SERIAL, |
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.of_match = altera_uart_ids, |
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.ofdata_to_platdata = altera_uart_ofdata_to_platdata, |
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.platdata_auto_alloc_size = sizeof(struct altera_uart_platdata), |
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.probe = altera_uart_probe, |
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.ops = &altera_uart_ops, |
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.flags = DM_FLAG_PRE_RELOC, |
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}; |
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#ifdef CONFIG_DEBUG_UART_ALTERA_UART |
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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 altera_uart_regs *regs = (void *)CONFIG_DEBUG_UART_BASE; |
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u32 div; |
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div = (CONFIG_DEBUG_UART_CLOCK / CONFIG_BAUDRATE) - 1; |
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writel(div, ®s->divisor); |
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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 altera_uart_regs *regs = (void *)CONFIG_DEBUG_UART_BASE; |
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while (1) { |
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u32 st = readl(®s->status); |
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if (st & ALTERA_UART_TRDY) |
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break; |
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} |
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writel(ch, ®s->txdata); |
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} |
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DEBUG_UART_FUNCS |
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#endif
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