+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
*
*
* Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
*
- * SPDX-License-Identifier: GPL-2.0+
+ * Modified to add driver model (DM) support
+ * (C) Copyright 2016 Marcel Ziswiler <marcel.ziswiler@toradex.com>
*/
#include <common.h>
+#include <hang.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/regs-uart.h>
#include <asm/io.h>
+#include <dm.h>
+#include <dm/platform_data/serial_pxa.h>
#include <linux/compiler.h>
#include <serial.h>
#include <watchdog.h>
DECLARE_GLOBAL_DATA_PTR;
-/*
- * The numbering scheme differs here for PXA25x, PXA27x and PXA3xx so we can
- * easily handle enabling of clock.
- */
-#ifdef CONFIG_CPU_MONAHANS
-#define UART_CLK_BASE CKENA_21_BTUART
-#define UART_CLK_REG CKENA
-#define BTUART_INDEX 0
-#define FFUART_INDEX 1
-#define STUART_INDEX 2
-#elif CONFIG_CPU_PXA25X
-#define UART_CLK_BASE (1 << 4) /* HWUART */
-#define UART_CLK_REG CKEN
-#define HWUART_INDEX 0
-#define STUART_INDEX 1
-#define FFUART_INDEX 2
-#define BTUART_INDEX 3
-#else /* PXA27x */
-#define UART_CLK_BASE CKEN5_STUART
-#define UART_CLK_REG CKEN
-#define STUART_INDEX 0
-#define FFUART_INDEX 1
-#define BTUART_INDEX 2
-#endif
-
-/*
- * Only PXA250 has HWUART, to avoid poluting the code with more macros,
- * artificially introduce this.
- */
-#ifndef CONFIG_CPU_PXA25X
-#define HWUART_INDEX 0xff
-#endif
-
-static uint32_t pxa_uart_get_baud_divider(void)
-{
- if (gd->baudrate == 1200)
- return 768;
- else if (gd->baudrate == 9600)
- return 96;
- else if (gd->baudrate == 19200)
- return 48;
- else if (gd->baudrate == 38400)
- return 24;
- else if (gd->baudrate == 57600)
- return 16;
- else if (gd->baudrate == 115200)
- return 8;
- else /* Unsupported baudrate */
- return 0;
-}
-
-static struct pxa_uart_regs *pxa_uart_index_to_regs(uint32_t uart_index)
+static uint32_t pxa_uart_get_baud_divider(int baudrate)
{
- switch (uart_index) {
- case FFUART_INDEX: return (struct pxa_uart_regs *)FFUART_BASE;
- case BTUART_INDEX: return (struct pxa_uart_regs *)BTUART_BASE;
- case STUART_INDEX: return (struct pxa_uart_regs *)STUART_BASE;
- case HWUART_INDEX: return (struct pxa_uart_regs *)HWUART_BASE;
- default:
- return NULL;
- }
+ return 921600 / baudrate;
}
static void pxa_uart_toggle_clock(uint32_t uart_index, int enable)
/*
* Enable clock and set baud rate, parity etc.
*/
-void pxa_setbrg_dev(uint32_t uart_index)
+void pxa_setbrg_common(struct pxa_uart_regs *uart_regs, int port, int baudrate)
{
- uint32_t divider = 0;
- struct pxa_uart_regs *uart_regs;
-
- divider = pxa_uart_get_baud_divider();
+ uint32_t divider = pxa_uart_get_baud_divider(baudrate);
if (!divider)
hang();
- uart_regs = pxa_uart_index_to_regs(uart_index);
- if (!uart_regs)
- hang();
- pxa_uart_toggle_clock(uart_index, 1);
+ pxa_uart_toggle_clock(port, 1);
/* Disable interrupts and FIFOs */
writel(0, &uart_regs->ier);
writel(IER_UUE, &uart_regs->ier);
}
+#ifndef CONFIG_DM_SERIAL
+static struct pxa_uart_regs *pxa_uart_index_to_regs(uint32_t uart_index)
+{
+ switch (uart_index) {
+ case FFUART_INDEX: return (struct pxa_uart_regs *)FFUART_BASE;
+ case BTUART_INDEX: return (struct pxa_uart_regs *)BTUART_BASE;
+ case STUART_INDEX: return (struct pxa_uart_regs *)STUART_BASE;
+ case HWUART_INDEX: return (struct pxa_uart_regs *)HWUART_BASE;
+ default:
+ return NULL;
+ }
+}
+
+/*
+ * Enable clock and set baud rate, parity etc.
+ */
+void pxa_setbrg_dev(uint32_t uart_index)
+{
+ struct pxa_uart_regs *uart_regs = pxa_uart_index_to_regs(uart_index);
+ if (!uart_regs)
+ panic("Failed getting UART registers\n");
+
+ pxa_setbrg_common(uart_regs, uart_index, gd->baudrate);
+}
+
/*
* Initialise the serial port with the given baudrate. The settings
* are always 8 data bits, no parity, 1 stop bit, no start bits.
*/
int pxa_init_dev(unsigned int uart_index)
{
- pxa_setbrg_dev (uart_index);
+ pxa_setbrg_dev(uart_index);
return 0;
}
serial_register(&serial_stuart_device);
#endif
}
+#endif /* CONFIG_DM_SERIAL */
+
+#ifdef CONFIG_DM_SERIAL
+static int pxa_serial_probe(struct udevice *dev)
+{
+ struct pxa_serial_platdata *plat = dev->platdata;
+
+ pxa_setbrg_common((struct pxa_uart_regs *)plat->base, plat->port,
+ plat->baudrate);
+ return 0;
+}
+
+static int pxa_serial_putc(struct udevice *dev, const char ch)
+{
+ struct pxa_serial_platdata *plat = dev->platdata;
+ struct pxa_uart_regs *uart_regs = (struct pxa_uart_regs *)plat->base;
+
+ /* Wait for last character to go. */
+ if (!(readl(&uart_regs->lsr) & LSR_TEMT))
+ return -EAGAIN;
+
+ writel(ch, &uart_regs->thr);
+
+ return 0;
+}
+
+static int pxa_serial_getc(struct udevice *dev)
+{
+ struct pxa_serial_platdata *plat = dev->platdata;
+ struct pxa_uart_regs *uart_regs = (struct pxa_uart_regs *)plat->base;
+
+ /* Wait for a character to arrive. */
+ if (!(readl(&uart_regs->lsr) & LSR_DR))
+ return -EAGAIN;
+
+ return readl(&uart_regs->rbr) & 0xff;
+}
+
+int pxa_serial_setbrg(struct udevice *dev, int baudrate)
+{
+ struct pxa_serial_platdata *plat = dev->platdata;
+ struct pxa_uart_regs *uart_regs = (struct pxa_uart_regs *)plat->base;
+ int port = plat->port;
+
+ pxa_setbrg_common(uart_regs, port, baudrate);
+
+ return 0;
+}
+
+static int pxa_serial_pending(struct udevice *dev, bool input)
+{
+ struct pxa_serial_platdata *plat = dev->platdata;
+ struct pxa_uart_regs *uart_regs = (struct pxa_uart_regs *)plat->base;
+
+ if (input)
+ return readl(&uart_regs->lsr) & LSR_DR ? 1 : 0;
+ else
+ return readl(&uart_regs->lsr) & LSR_TEMT ? 0 : 1;
+
+ return 0;
+}
+
+static const struct dm_serial_ops pxa_serial_ops = {
+ .putc = pxa_serial_putc,
+ .pending = pxa_serial_pending,
+ .getc = pxa_serial_getc,
+ .setbrg = pxa_serial_setbrg,
+};
+
+U_BOOT_DRIVER(serial_pxa) = {
+ .name = "serial_pxa",
+ .id = UCLASS_SERIAL,
+ .probe = pxa_serial_probe,
+ .ops = &pxa_serial_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};
+#endif /* CONFIG_DM_SERIAL */
projects / oweals / u-boot.git / blobdiff