--- /dev/null
+/*
+ * (c) 2004 Sascha Hauer <sascha@saschahauer.de>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/arch/imx-regs.h>
+#include <serial.h>
+#include <linux/compiler.h>
+
+#if defined CONFIG_IMX_SERIAL1
+#define UART_BASE IMX_UART1_BASE
+#elif defined CONFIG_IMX_SERIAL2
+#define UART_BASE IMX_UART2_BASE
+#else
+#error "define CONFIG_IMX_SERIAL1, CONFIG_IMX_SERIAL2 or CONFIG_IMX_SERIAL_NONE"
+#endif
+
+struct imx_serial {
+ volatile uint32_t urxd[16];
+ volatile uint32_t utxd[16];
+ volatile uint32_t ucr1;
+ volatile uint32_t ucr2;
+ volatile uint32_t ucr3;
+ volatile uint32_t ucr4;
+ volatile uint32_t ufcr;
+ volatile uint32_t usr1;
+ volatile uint32_t usr2;
+ volatile uint32_t uesc;
+ volatile uint32_t utim;
+ volatile uint32_t ubir;
+ volatile uint32_t ubmr;
+ volatile uint32_t ubrc;
+ volatile uint32_t bipr[4];
+ volatile uint32_t bmpr[4];
+ volatile uint32_t uts;
+};
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static void imx_serial_setbrg(void)
+{
+ serial_init();
+}
+
+extern void imx_gpio_mode(int gpio_mode);
+
+/*
+ * Initialise the serial port with the given baudrate. The settings
+ * are always 8 data bits, no parity, 1 stop bit, no start bits.
+ *
+ */
+static int imx_serial_init(void)
+{
+ volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
+ unsigned int ufcr_rfdiv;
+ unsigned int refclk;
+
+#ifdef CONFIG_IMX_SERIAL1
+ imx_gpio_mode(PC11_PF_UART1_TXD);
+ imx_gpio_mode(PC12_PF_UART1_RXD);
+#else
+ imx_gpio_mode(PB30_PF_UART2_TXD);
+ imx_gpio_mode(PB31_PF_UART2_RXD);
+#endif
+
+ /* Disable UART */
+ base->ucr1 &= ~UCR1_UARTEN;
+
+ /* Set to default POR state */
+
+ base->ucr1 = 0x00000004;
+ base->ucr2 = 0x00000000;
+ base->ucr3 = 0x00000000;
+ base->ucr4 = 0x00008040;
+ base->uesc = 0x0000002B;
+ base->utim = 0x00000000;
+ base->ubir = 0x00000000;
+ base->ubmr = 0x00000000;
+ base->uts = 0x00000000;
+ /* Set clocks */
+ base->ucr4 |= UCR4_REF16;
+
+ /* Configure FIFOs */
+ base->ufcr = 0xa81;
+
+ /* set the baud rate.
+ *
+ * baud * 16 x
+ * --------- = -
+ * refclk y
+ *
+ * x - 1 = UBIR
+ * y - 1 = UBMR
+ *
+ * each register is 16 bits wide. refclk max is 96 MHz
+ *
+ */
+
+ ufcr_rfdiv = ((base->ufcr) & UFCR_RFDIV) >> 7;
+ if (ufcr_rfdiv == 6)
+ ufcr_rfdiv = 7;
+ else
+ ufcr_rfdiv = 6 - ufcr_rfdiv;
+
+ refclk = get_PERCLK1();
+ refclk /= ufcr_rfdiv;
+
+ /* Set the numerator value minus one of the BRM ratio */
+ base->ubir = (gd->baudrate / 100) - 1;
+
+ /* Set the denominator value minus one of the BRM ratio */
+ base->ubmr = (refclk/(16 * 100)) - 1;
+
+ /* Set to 8N1 */
+ base->ucr2 &= ~UCR2_PREN;
+ base->ucr2 |= UCR2_WS;
+ base->ucr2 &= ~UCR2_STPB;
+
+ /* Ignore RTS */
+ base->ucr2 |= UCR2_IRTS;
+
+ /* Enable UART */
+ base->ucr1 |= UCR1_UARTEN | UCR1_UARTCLKEN;
+
+ /* Enable FIFOs */
+ base->ucr2 |= UCR2_SRST | UCR2_RXEN | UCR2_TXEN;
+
+ /* Clear status flags */
+ base->usr2 |= USR2_ADET |
+ USR2_DTRF |
+ USR2_IDLE |
+ USR2_IRINT |
+ USR2_WAKE |
+ USR2_RTSF |
+ USR2_BRCD |
+ USR2_ORE;
+
+ /* Clear status flags */
+ base->usr1 |= USR1_PARITYERR |
+ USR1_RTSD |
+ USR1_ESCF |
+ USR1_FRAMERR |
+ USR1_AIRINT |
+ USR1_AWAKE;
+ return (0);
+}
+
+/*
+ * Read a single byte from the serial port. Returns 1 on success, 0
+ * otherwise. When the function is successful, the character read is
+ * written into its argument c.
+ */
+static int imx_serial_getc(void)
+{
+ volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
+ unsigned char ch;
+
+ while(base->uts & UTS_RXEMPTY);
+
+ ch = (char)base->urxd[0];
+
+ return ch;
+}
+
+#ifdef CONFIG_HWFLOW
+static int hwflow = 0; /* turned off by default */
+int hwflow_onoff(int on)
+{
+}
+#endif
+
+/*
+ * Output a single byte to the serial port.
+ */
+static void imx_serial_putc(const char c)
+{
+ volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
+
+ /* Wait for Tx FIFO not full */
+ while (base->uts & UTS_TXFULL);
+
+ base->utxd[0] = c;
+
+ /* If \n, also do \r */
+ if (c == '\n')
+ serial_putc ('\r');
+}
+
+/*
+ * Test whether a character is in the RX buffer
+ */
+static int imx_serial_tstc(void)
+{
+ volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
+
+ /* If receive fifo is empty, return false */
+ if (base->uts & UTS_RXEMPTY)
+ return 0;
+ return 1;
+}
+
+static struct serial_device imx_serial_drv = {
+ .name = "imx_serial",
+ .start = imx_serial_init,
+ .stop = NULL,
+ .setbrg = imx_serial_setbrg,
+ .putc = imx_serial_putc,
+ .puts = default_serial_puts,
+ .getc = imx_serial_getc,
+ .tstc = imx_serial_tstc,
+};
+
+void imx_serial_initialize(void)
+{
+ serial_register(&imx_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+ return &imx_serial_drv;
+}
Code Review / kvmfornfv.git / blobdiff