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241 lines
5.1 KiB
241 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* (C) Copyright 2009 SAMSUNG Electronics |
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* Minkyu Kang <[email protected]> |
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* Heungjun Kim <[email protected]> |
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* |
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* based on drivers/serial/s3c64xx.c |
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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 <fdtdec.h> |
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#include <linux/compiler.h> |
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#include <asm/io.h> |
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#include <asm/arch/clk.h> |
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#include <asm/arch/uart.h> |
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#include <serial.h> |
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#include <clk.h> |
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DECLARE_GLOBAL_DATA_PTR; |
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#define RX_FIFO_COUNT_SHIFT 0 |
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#define RX_FIFO_COUNT_MASK (0xff << RX_FIFO_COUNT_SHIFT) |
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#define RX_FIFO_FULL (1 << 8) |
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#define TX_FIFO_COUNT_SHIFT 16 |
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#define TX_FIFO_COUNT_MASK (0xff << TX_FIFO_COUNT_SHIFT) |
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#define TX_FIFO_FULL (1 << 24) |
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/* Information about a serial port */ |
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struct s5p_serial_platdata { |
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struct s5p_uart *reg; /* address of registers in physical memory */ |
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u8 port_id; /* uart port number */ |
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}; |
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/* |
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* The coefficient, used to calculate the baudrate on S5P UARTs is |
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* calculated as |
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* C = UBRDIV * 16 + number_of_set_bits_in_UDIVSLOT |
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* however, section 31.6.11 of the datasheet doesn't recomment using 1 for 1, |
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* 3 for 2, ... (2^n - 1) for n, instead, they suggest using these constants: |
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*/ |
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static const int udivslot[] = { |
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0, |
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0x0080, |
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0x0808, |
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0x0888, |
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0x2222, |
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0x4924, |
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0x4a52, |
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0x54aa, |
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0x5555, |
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0xd555, |
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0xd5d5, |
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0xddd5, |
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0xdddd, |
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0xdfdd, |
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0xdfdf, |
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0xffdf, |
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}; |
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static void __maybe_unused s5p_serial_init(struct s5p_uart *uart) |
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{ |
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/* enable FIFOs, auto clear Rx FIFO */ |
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writel(0x3, &uart->ufcon); |
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writel(0, &uart->umcon); |
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/* 8N1 */ |
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writel(0x3, &uart->ulcon); |
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/* No interrupts, no DMA, pure polling */ |
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writel(0x245, &uart->ucon); |
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} |
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static void __maybe_unused s5p_serial_baud(struct s5p_uart *uart, uint uclk, |
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int baudrate) |
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{ |
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u32 val; |
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val = uclk / baudrate; |
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writel(val / 16 - 1, &uart->ubrdiv); |
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if (s5p_uart_divslot()) |
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writew(udivslot[val % 16], &uart->rest.slot); |
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else |
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writeb(val % 16, &uart->rest.value); |
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} |
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#ifndef CONFIG_SPL_BUILD |
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int s5p_serial_setbrg(struct udevice *dev, int baudrate) |
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{ |
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struct s5p_serial_platdata *plat = dev->platdata; |
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struct s5p_uart *const uart = plat->reg; |
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u32 uclk; |
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#ifdef CONFIG_CLK_EXYNOS |
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struct clk clk; |
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u32 ret; |
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ret = clk_get_by_index(dev, 1, &clk); |
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if (ret < 0) |
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return ret; |
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uclk = clk_get_rate(&clk); |
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#else |
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uclk = get_uart_clk(plat->port_id); |
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#endif |
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s5p_serial_baud(uart, uclk, baudrate); |
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return 0; |
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} |
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static int s5p_serial_probe(struct udevice *dev) |
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{ |
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struct s5p_serial_platdata *plat = dev->platdata; |
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struct s5p_uart *const uart = plat->reg; |
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s5p_serial_init(uart); |
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return 0; |
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} |
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static int serial_err_check(const struct s5p_uart *const uart, int op) |
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{ |
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unsigned int mask; |
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/* |
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* UERSTAT |
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* Break Detect [3] |
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* Frame Err [2] : receive operation |
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* Parity Err [1] : receive operation |
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* Overrun Err [0] : receive operation |
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*/ |
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if (op) |
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mask = 0x8; |
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else |
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mask = 0xf; |
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return readl(&uart->uerstat) & mask; |
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} |
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static int s5p_serial_getc(struct udevice *dev) |
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{ |
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struct s5p_serial_platdata *plat = dev->platdata; |
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struct s5p_uart *const uart = plat->reg; |
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if (!(readl(&uart->ufstat) & RX_FIFO_COUNT_MASK)) |
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return -EAGAIN; |
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serial_err_check(uart, 0); |
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return (int)(readb(&uart->urxh) & 0xff); |
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} |
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static int s5p_serial_putc(struct udevice *dev, const char ch) |
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{ |
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struct s5p_serial_platdata *plat = dev->platdata; |
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struct s5p_uart *const uart = plat->reg; |
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if (readl(&uart->ufstat) & TX_FIFO_FULL) |
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return -EAGAIN; |
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writeb(ch, &uart->utxh); |
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serial_err_check(uart, 1); |
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return 0; |
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} |
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static int s5p_serial_pending(struct udevice *dev, bool input) |
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{ |
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struct s5p_serial_platdata *plat = dev->platdata; |
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struct s5p_uart *const uart = plat->reg; |
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uint32_t ufstat = readl(&uart->ufstat); |
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if (input) |
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return (ufstat & RX_FIFO_COUNT_MASK) >> RX_FIFO_COUNT_SHIFT; |
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else |
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return (ufstat & TX_FIFO_COUNT_MASK) >> TX_FIFO_COUNT_SHIFT; |
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} |
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static int s5p_serial_ofdata_to_platdata(struct udevice *dev) |
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{ |
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struct s5p_serial_platdata *plat = dev->platdata; |
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fdt_addr_t addr; |
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addr = devfdt_get_addr(dev); |
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if (addr == FDT_ADDR_T_NONE) |
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return -EINVAL; |
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plat->reg = (struct s5p_uart *)addr; |
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plat->port_id = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), |
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"id", dev->seq); |
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return 0; |
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} |
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static const struct dm_serial_ops s5p_serial_ops = { |
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.putc = s5p_serial_putc, |
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.pending = s5p_serial_pending, |
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.getc = s5p_serial_getc, |
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.setbrg = s5p_serial_setbrg, |
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}; |
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static const struct udevice_id s5p_serial_ids[] = { |
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{ .compatible = "samsung,exynos4210-uart" }, |
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{ } |
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}; |
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U_BOOT_DRIVER(serial_s5p) = { |
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.name = "serial_s5p", |
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.id = UCLASS_SERIAL, |
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.of_match = s5p_serial_ids, |
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.ofdata_to_platdata = s5p_serial_ofdata_to_platdata, |
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.platdata_auto_alloc_size = sizeof(struct s5p_serial_platdata), |
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.probe = s5p_serial_probe, |
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.ops = &s5p_serial_ops, |
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.flags = DM_FLAG_PRE_RELOC, |
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}; |
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#endif |
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#ifdef CONFIG_DEBUG_UART_S5P |
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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 s5p_uart *uart = (struct s5p_uart *)CONFIG_DEBUG_UART_BASE; |
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s5p_serial_init(uart); |
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s5p_serial_baud(uart, CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE); |
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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 s5p_uart *uart = (struct s5p_uart *)CONFIG_DEBUG_UART_BASE; |
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while (readl(&uart->ufstat) & TX_FIFO_FULL); |
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writeb(ch, &uart->utxh); |
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} |
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DEBUG_UART_FUNCS |
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#endif
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