*
* based on drivers/serial/s3c64xx.c
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <linux/compiler.h>
#include <asm/io.h>
-#include <asm/arch/uart.h>
#include <asm/arch/clk.h>
+#include <asm/arch/uart.h>
#include <serial.h>
+#include <clk.h>
-static inline struct s5p_uart *s5p_get_base_uart(int dev_index)
-{
- u32 offset = dev_index * sizeof(struct s5p_uart);
- return (struct s5p_uart *)(samsung_get_base_uart() + offset);
-}
+DECLARE_GLOBAL_DATA_PTR;
+
+#define RX_FIFO_COUNT_SHIFT 0
+#define RX_FIFO_COUNT_MASK (0xff << RX_FIFO_COUNT_SHIFT)
+#define RX_FIFO_FULL (1 << 8)
+#define TX_FIFO_COUNT_SHIFT 16
+#define TX_FIFO_COUNT_MASK (0xff << TX_FIFO_COUNT_SHIFT)
+#define TX_FIFO_FULL (1 << 24)
+
+/* Information about a serial port */
+struct s5p_serial_platdata {
+ struct s5p_uart *reg; /* address of registers in physical memory */
+ u8 port_id; /* uart port number */
+};
/*
* The coefficient, used to calculate the baudrate on S5P UARTs is
0xffdf,
};
-void serial_setbrg_dev(const int dev_index)
+static void __maybe_unused s5p_serial_init(struct s5p_uart *uart)
+{
+ /* enable FIFOs, auto clear Rx FIFO */
+ writel(0x3, &uart->ufcon);
+ writel(0, &uart->umcon);
+ /* 8N1 */
+ writel(0x3, &uart->ulcon);
+ /* No interrupts, no DMA, pure polling */
+ writel(0x245, &uart->ucon);
+}
+
+static void __maybe_unused s5p_serial_baud(struct s5p_uart *uart, uint uclk,
+ int baudrate)
{
- DECLARE_GLOBAL_DATA_PTR;
- struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
- u32 uclk = get_uart_clk(dev_index);
- u32 baudrate = gd->baudrate;
u32 val;
val = uclk / baudrate;
writel(val / 16 - 1, &uart->ubrdiv);
- writew(udivslot[val % 16], &uart->udivslot);
+
+ if (s5p_uart_divslot())
+ writew(udivslot[val % 16], &uart->rest.slot);
+ else
+ writeb(val % 16, &uart->rest.value);
}
-/*
- * Initialise the serial port with the given baudrate. The settings
- * are always 8 data bits, no parity, 1 stop bit, no start bits.
- */
-int serial_init_dev(const int dev_index)
+#ifndef CONFIG_SPL_BUILD
+int s5p_serial_setbrg(struct udevice *dev, int baudrate)
{
- struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
+ struct s5p_serial_platdata *plat = dev->platdata;
+ struct s5p_uart *const uart = plat->reg;
+ u32 uclk;
- /* reset and enable FIFOs, set triggers to the maximum */
- writel(0, &uart->ufcon);
- writel(0, &uart->umcon);
- /* 8N1 */
- writel(0x3, &uart->ulcon);
- /* No interrupts, no DMA, pure polling */
- writel(0x245, &uart->ucon);
+#ifdef CONFIG_CLK_EXYNOS
+ struct clk clk;
+ u32 ret;
+
+ ret = clk_get_by_index(dev, 1, &clk);
+ if (ret < 0)
+ return ret;
+ uclk = clk_get_rate(&clk);
+#else
+ uclk = get_uart_clk(plat->port_id);
+#endif
- serial_setbrg_dev(dev_index);
+ s5p_serial_baud(uart, uclk, baudrate);
return 0;
}
-static int serial_err_check(const int dev_index, int op)
+static int s5p_serial_probe(struct udevice *dev)
+{
+ struct s5p_serial_platdata *plat = dev->platdata;
+ struct s5p_uart *const uart = plat->reg;
+
+ s5p_serial_init(uart);
+
+ return 0;
+}
+
+static int serial_err_check(const struct s5p_uart *const uart, int op)
{
- struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
unsigned int mask;
/*
return readl(&uart->uerstat) & mask;
}
-/*
- * Read a single byte from the serial port. Returns 1 on success, 0
- * otherwise. When the function is succesfull, the character read is
- * written into its argument c.
- */
-int serial_getc_dev(const int dev_index)
+static int s5p_serial_getc(struct udevice *dev)
{
- struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
+ struct s5p_serial_platdata *plat = dev->platdata;
+ struct s5p_uart *const uart = plat->reg;
- /* wait for character to arrive */
- while (!(readl(&uart->utrstat) & 0x1)) {
- if (serial_err_check(dev_index, 0))
- return 0;
- }
+ if (!(readl(&uart->ufstat) & RX_FIFO_COUNT_MASK))
+ return -EAGAIN;
+ serial_err_check(uart, 0);
return (int)(readb(&uart->urxh) & 0xff);
}
-/*
- * Output a single byte to the serial port.
- */
-void serial_putc_dev(const char c, const int dev_index)
+static int s5p_serial_putc(struct udevice *dev, const char ch)
{
- struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
+ struct s5p_serial_platdata *plat = dev->platdata;
+ struct s5p_uart *const uart = plat->reg;
- /* wait for room in the tx FIFO */
- while (!(readl(&uart->utrstat) & 0x2)) {
- if (serial_err_check(dev_index, 1))
- return;
- }
+ if (readl(&uart->ufstat) & TX_FIFO_FULL)
+ return -EAGAIN;
- writeb(c, &uart->utxh);
+ writeb(ch, &uart->utxh);
+ serial_err_check(uart, 1);
- /* If \n, also do \r */
- if (c == '\n')
- serial_putc('\r');
+ return 0;
}
-/*
- * Test whether a character is in the RX buffer
- */
-int serial_tstc_dev(const int dev_index)
+static int s5p_serial_pending(struct udevice *dev, bool input)
{
- struct s5p_uart *const uart = s5p_get_base_uart(dev_index);
+ struct s5p_serial_platdata *plat = dev->platdata;
+ struct s5p_uart *const uart = plat->reg;
+ uint32_t ufstat = readl(&uart->ufstat);
- return (int)(readl(&uart->utrstat) & 0x1);
+ if (input)
+ return (ufstat & RX_FIFO_COUNT_MASK) >> RX_FIFO_COUNT_SHIFT;
+ else
+ return (ufstat & TX_FIFO_COUNT_MASK) >> TX_FIFO_COUNT_SHIFT;
}
-void serial_puts_dev(const char *s, const int dev_index)
+static int s5p_serial_ofdata_to_platdata(struct udevice *dev)
{
- while (*s)
- serial_putc_dev(*s++, dev_index);
+ struct s5p_serial_platdata *plat = dev->platdata;
+ fdt_addr_t addr;
+
+ addr = dev_get_addr(dev);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ plat->reg = (struct s5p_uart *)addr;
+ plat->port_id = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
+ "id", dev->seq);
+ return 0;
}
-/* Multi serial device functions */
-#define DECLARE_S5P_SERIAL_FUNCTIONS(port) \
-int s5p_serial##port##_init(void) { return serial_init_dev(port); } \
-void s5p_serial##port##_setbrg(void) { serial_setbrg_dev(port); } \
-int s5p_serial##port##_getc(void) { return serial_getc_dev(port); } \
-int s5p_serial##port##_tstc(void) { return serial_tstc_dev(port); } \
-void s5p_serial##port##_putc(const char c) { serial_putc_dev(c, port); } \
-void s5p_serial##port##_puts(const char *s) { serial_puts_dev(s, port); }
-
-#define INIT_S5P_SERIAL_STRUCTURE(port, name, bus) { \
- name, \
- bus, \
- s5p_serial##port##_init, \
- NULL, \
- s5p_serial##port##_setbrg, \
- s5p_serial##port##_getc, \
- s5p_serial##port##_tstc, \
- s5p_serial##port##_putc, \
- s5p_serial##port##_puts, }
-
-DECLARE_S5P_SERIAL_FUNCTIONS(0);
-struct serial_device s5p_serial0_device =
- INIT_S5P_SERIAL_STRUCTURE(0, "s5pser0", "S5PUART0");
-DECLARE_S5P_SERIAL_FUNCTIONS(1);
-struct serial_device s5p_serial1_device =
- INIT_S5P_SERIAL_STRUCTURE(1, "s5pser1", "S5PUART1");
-DECLARE_S5P_SERIAL_FUNCTIONS(2);
-struct serial_device s5p_serial2_device =
- INIT_S5P_SERIAL_STRUCTURE(2, "s5pser2", "S5PUART2");
-DECLARE_S5P_SERIAL_FUNCTIONS(3);
-struct serial_device s5p_serial3_device =
- INIT_S5P_SERIAL_STRUCTURE(3, "s5pser3", "S5PUART3");
+static const struct dm_serial_ops s5p_serial_ops = {
+ .putc = s5p_serial_putc,
+ .pending = s5p_serial_pending,
+ .getc = s5p_serial_getc,
+ .setbrg = s5p_serial_setbrg,
+};
+
+static const struct udevice_id s5p_serial_ids[] = {
+ { .compatible = "samsung,exynos4210-uart" },
+ { }
+};
+
+U_BOOT_DRIVER(serial_s5p) = {
+ .name = "serial_s5p",
+ .id = UCLASS_SERIAL,
+ .of_match = s5p_serial_ids,
+ .ofdata_to_platdata = s5p_serial_ofdata_to_platdata,
+ .platdata_auto_alloc_size = sizeof(struct s5p_serial_platdata),
+ .probe = s5p_serial_probe,
+ .ops = &s5p_serial_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};
+#endif
+
+#ifdef CONFIG_DEBUG_UART_S5P
+
+#include <debug_uart.h>
+
+static inline void _debug_uart_init(void)
+{
+ struct s5p_uart *uart = (struct s5p_uart *)CONFIG_DEBUG_UART_BASE;
+
+ s5p_serial_init(uart);
+ s5p_serial_baud(uart, CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE);
+}
+
+static inline void _debug_uart_putc(int ch)
+{
+ struct s5p_uart *uart = (struct s5p_uart *)CONFIG_DEBUG_UART_BASE;
+
+ while (readl(&uart->ufstat) & TX_FIFO_FULL);
+
+ writeb(ch, &uart->utxh);
+}
+
+DEBUG_UART_FUNCS
+
+#endif
projects / J-u-boot.git / blobdiff