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Diffstat (limited to 'drivers/tty/serial/8250/8250.h')
-rw-r--r--drivers/tty/serial/8250/8250.h416
1 files changed, 416 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h
new file mode 100644
index 000000000..eeb7b43eb
--- /dev/null
+++ b/drivers/tty/serial/8250/8250.h
@@ -0,0 +1,416 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Driver for 8250/16550-type serial ports
+ *
+ * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ * Copyright (C) 2001 Russell King.
+ */
+
+#include <linux/bits.h>
+#include <linux/serial_8250.h>
+#include <linux/serial_reg.h>
+#include <linux/dmaengine.h>
+
+#include "../serial_mctrl_gpio.h"
+
+struct uart_8250_dma {
+ int (*tx_dma)(struct uart_8250_port *p);
+ int (*rx_dma)(struct uart_8250_port *p);
+ void (*prepare_tx_dma)(struct uart_8250_port *p);
+ void (*prepare_rx_dma)(struct uart_8250_port *p);
+
+ /* Filter function */
+ dma_filter_fn fn;
+ /* Parameter to the filter function */
+ void *rx_param;
+ void *tx_param;
+
+ struct dma_slave_config rxconf;
+ struct dma_slave_config txconf;
+
+ struct dma_chan *rxchan;
+ struct dma_chan *txchan;
+
+ /* Device address base for DMA operations */
+ phys_addr_t rx_dma_addr;
+ phys_addr_t tx_dma_addr;
+
+ /* DMA address of the buffer in memory */
+ dma_addr_t rx_addr;
+ dma_addr_t tx_addr;
+
+ dma_cookie_t rx_cookie;
+ dma_cookie_t tx_cookie;
+
+ void *rx_buf;
+
+ size_t rx_size;
+ size_t tx_size;
+
+ unsigned char tx_running;
+ unsigned char tx_err;
+ unsigned char rx_running;
+};
+
+struct old_serial_port {
+ unsigned int uart;
+ unsigned int baud_base;
+ unsigned int port;
+ unsigned int irq;
+ upf_t flags;
+ unsigned char io_type;
+ unsigned char __iomem *iomem_base;
+ unsigned short iomem_reg_shift;
+};
+
+struct serial8250_config {
+ const char *name;
+ unsigned short fifo_size;
+ unsigned short tx_loadsz;
+ unsigned char fcr;
+ unsigned char rxtrig_bytes[UART_FCR_R_TRIG_MAX_STATE];
+ unsigned int flags;
+};
+
+#define UART_CAP_FIFO BIT(8) /* UART has FIFO */
+#define UART_CAP_EFR BIT(9) /* UART has EFR */
+#define UART_CAP_SLEEP BIT(10) /* UART has IER sleep */
+#define UART_CAP_AFE BIT(11) /* MCR-based hw flow control */
+#define UART_CAP_UUE BIT(12) /* UART needs IER bit 6 set (Xscale) */
+#define UART_CAP_RTOIE BIT(13) /* UART needs IER bit 4 set (Xscale, Tegra) */
+#define UART_CAP_HFIFO BIT(14) /* UART has a "hidden" FIFO */
+#define UART_CAP_RPM BIT(15) /* Runtime PM is active while idle */
+#define UART_CAP_IRDA BIT(16) /* UART supports IrDA line discipline */
+#define UART_CAP_MINI BIT(17) /* Mini UART on BCM283X family lacks:
+ * STOP PARITY EPAR SPAR WLEN5 WLEN6
+ */
+#define UART_CAP_NOTEMT BIT(18) /* UART without interrupt on TEMT available */
+
+#define UART_BUG_QUOT BIT(0) /* UART has buggy quot LSB */
+#define UART_BUG_TXEN BIT(1) /* UART has buggy TX IIR status */
+#define UART_BUG_NOMSR BIT(2) /* UART has buggy MSR status bits (Au1x00) */
+#define UART_BUG_THRE BIT(3) /* UART has buggy THRE reassertion */
+#define UART_BUG_TXRACE BIT(5) /* UART Tx fails to set remote DR */
+
+
+#ifdef CONFIG_SERIAL_8250_SHARE_IRQ
+#define SERIAL8250_SHARE_IRQS 1
+#else
+#define SERIAL8250_SHARE_IRQS 0
+#endif
+
+#define SERIAL8250_PORT_FLAGS(_base, _irq, _flags) \
+ { \
+ .iobase = _base, \
+ .irq = _irq, \
+ .uartclk = 1843200, \
+ .iotype = UPIO_PORT, \
+ .flags = UPF_BOOT_AUTOCONF | (_flags), \
+ }
+
+#define SERIAL8250_PORT(_base, _irq) SERIAL8250_PORT_FLAGS(_base, _irq, 0)
+
+
+static inline int serial_in(struct uart_8250_port *up, int offset)
+{
+ return up->port.serial_in(&up->port, offset);
+}
+
+static inline void serial_out(struct uart_8250_port *up, int offset, int value)
+{
+ up->port.serial_out(&up->port, offset, value);
+}
+
+/**
+ * serial_lsr_in - Read LSR register and preserve flags across reads
+ * @up: uart 8250 port
+ *
+ * Read LSR register and handle saving non-preserved flags across reads.
+ * The flags that are not preserved across reads are stored into
+ * up->lsr_saved_flags.
+ *
+ * Returns LSR value or'ed with the preserved flags (if any).
+ */
+static inline u16 serial_lsr_in(struct uart_8250_port *up)
+{
+ u16 lsr = up->lsr_saved_flags;
+
+ lsr |= serial_in(up, UART_LSR);
+ up->lsr_saved_flags = lsr & up->lsr_save_mask;
+
+ return lsr;
+}
+
+/*
+ * For the 16C950
+ */
+static void serial_icr_write(struct uart_8250_port *up, int offset, int value)
+{
+ serial_out(up, UART_SCR, offset);
+ serial_out(up, UART_ICR, value);
+}
+
+static unsigned int __maybe_unused serial_icr_read(struct uart_8250_port *up,
+ int offset)
+{
+ unsigned int value;
+
+ serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD);
+ serial_out(up, UART_SCR, offset);
+ value = serial_in(up, UART_ICR);
+ serial_icr_write(up, UART_ACR, up->acr);
+
+ return value;
+}
+
+void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p);
+
+static inline int serial_dl_read(struct uart_8250_port *up)
+{
+ return up->dl_read(up);
+}
+
+static inline void serial_dl_write(struct uart_8250_port *up, int value)
+{
+ up->dl_write(up, value);
+}
+
+static inline bool serial8250_set_THRI(struct uart_8250_port *up)
+{
+ if (up->ier & UART_IER_THRI)
+ return false;
+ up->ier |= UART_IER_THRI;
+ serial_out(up, UART_IER, up->ier);
+ return true;
+}
+
+static inline bool serial8250_clear_THRI(struct uart_8250_port *up)
+{
+ if (!(up->ier & UART_IER_THRI))
+ return false;
+ up->ier &= ~UART_IER_THRI;
+ serial_out(up, UART_IER, up->ier);
+ return true;
+}
+
+struct uart_8250_port *serial8250_get_port(int line);
+
+void serial8250_rpm_get(struct uart_8250_port *p);
+void serial8250_rpm_put(struct uart_8250_port *p);
+
+void serial8250_rpm_get_tx(struct uart_8250_port *p);
+void serial8250_rpm_put_tx(struct uart_8250_port *p);
+
+int serial8250_em485_config(struct uart_port *port, struct ktermios *termios,
+ struct serial_rs485 *rs485);
+void serial8250_em485_start_tx(struct uart_8250_port *p);
+void serial8250_em485_stop_tx(struct uart_8250_port *p);
+void serial8250_em485_destroy(struct uart_8250_port *p);
+extern struct serial_rs485 serial8250_em485_supported;
+
+/* MCR <-> TIOCM conversion */
+static inline int serial8250_TIOCM_to_MCR(int tiocm)
+{
+ int mcr = 0;
+
+ if (tiocm & TIOCM_RTS)
+ mcr |= UART_MCR_RTS;
+ if (tiocm & TIOCM_DTR)
+ mcr |= UART_MCR_DTR;
+ if (tiocm & TIOCM_OUT1)
+ mcr |= UART_MCR_OUT1;
+ if (tiocm & TIOCM_OUT2)
+ mcr |= UART_MCR_OUT2;
+ if (tiocm & TIOCM_LOOP)
+ mcr |= UART_MCR_LOOP;
+
+ return mcr;
+}
+
+static inline int serial8250_MCR_to_TIOCM(int mcr)
+{
+ int tiocm = 0;
+
+ if (mcr & UART_MCR_RTS)
+ tiocm |= TIOCM_RTS;
+ if (mcr & UART_MCR_DTR)
+ tiocm |= TIOCM_DTR;
+ if (mcr & UART_MCR_OUT1)
+ tiocm |= TIOCM_OUT1;
+ if (mcr & UART_MCR_OUT2)
+ tiocm |= TIOCM_OUT2;
+ if (mcr & UART_MCR_LOOP)
+ tiocm |= TIOCM_LOOP;
+
+ return tiocm;
+}
+
+/* MSR <-> TIOCM conversion */
+static inline int serial8250_MSR_to_TIOCM(int msr)
+{
+ int tiocm = 0;
+
+ if (msr & UART_MSR_DCD)
+ tiocm |= TIOCM_CAR;
+ if (msr & UART_MSR_RI)
+ tiocm |= TIOCM_RNG;
+ if (msr & UART_MSR_DSR)
+ tiocm |= TIOCM_DSR;
+ if (msr & UART_MSR_CTS)
+ tiocm |= TIOCM_CTS;
+
+ return tiocm;
+}
+
+static inline void serial8250_out_MCR(struct uart_8250_port *up, int value)
+{
+ serial_out(up, UART_MCR, value);
+
+ if (up->gpios)
+ mctrl_gpio_set(up->gpios, serial8250_MCR_to_TIOCM(value));
+}
+
+static inline int serial8250_in_MCR(struct uart_8250_port *up)
+{
+ int mctrl;
+
+ mctrl = serial_in(up, UART_MCR);
+
+ if (up->gpios) {
+ unsigned int mctrl_gpio = 0;
+
+ mctrl_gpio = mctrl_gpio_get_outputs(up->gpios, &mctrl_gpio);
+ mctrl |= serial8250_TIOCM_to_MCR(mctrl_gpio);
+ }
+
+ return mctrl;
+}
+
+bool alpha_jensen(void);
+void alpha_jensen_set_mctrl(struct uart_port *port, unsigned int mctrl);
+
+#ifdef CONFIG_SERIAL_8250_PNP
+int serial8250_pnp_init(void);
+void serial8250_pnp_exit(void);
+#else
+static inline int serial8250_pnp_init(void) { return 0; }
+static inline void serial8250_pnp_exit(void) { }
+#endif
+
+#ifdef CONFIG_SERIAL_8250_FINTEK
+int fintek_8250_probe(struct uart_8250_port *uart);
+#else
+static inline int fintek_8250_probe(struct uart_8250_port *uart) { return 0; }
+#endif
+
+#ifdef CONFIG_ARCH_OMAP1
+#include <linux/soc/ti/omap1-soc.h>
+static inline int is_omap1_8250(struct uart_8250_port *pt)
+{
+ int res;
+
+ switch (pt->port.mapbase) {
+ case OMAP1_UART1_BASE:
+ case OMAP1_UART2_BASE:
+ case OMAP1_UART3_BASE:
+ res = 1;
+ break;
+ default:
+ res = 0;
+ break;
+ }
+
+ return res;
+}
+
+static inline int is_omap1510_8250(struct uart_8250_port *pt)
+{
+ if (!cpu_is_omap1510())
+ return 0;
+
+ return is_omap1_8250(pt);
+}
+#else
+static inline int is_omap1_8250(struct uart_8250_port *pt)
+{
+ return 0;
+}
+static inline int is_omap1510_8250(struct uart_8250_port *pt)
+{
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_SERIAL_8250_DMA
+extern int serial8250_tx_dma(struct uart_8250_port *);
+extern int serial8250_rx_dma(struct uart_8250_port *);
+extern void serial8250_rx_dma_flush(struct uart_8250_port *);
+extern int serial8250_request_dma(struct uart_8250_port *);
+extern void serial8250_release_dma(struct uart_8250_port *);
+
+static inline void serial8250_do_prepare_tx_dma(struct uart_8250_port *p)
+{
+ struct uart_8250_dma *dma = p->dma;
+
+ if (dma->prepare_tx_dma)
+ dma->prepare_tx_dma(p);
+}
+
+static inline void serial8250_do_prepare_rx_dma(struct uart_8250_port *p)
+{
+ struct uart_8250_dma *dma = p->dma;
+
+ if (dma->prepare_rx_dma)
+ dma->prepare_rx_dma(p);
+}
+
+static inline bool serial8250_tx_dma_running(struct uart_8250_port *p)
+{
+ struct uart_8250_dma *dma = p->dma;
+
+ return dma && dma->tx_running;
+}
+#else
+static inline int serial8250_tx_dma(struct uart_8250_port *p)
+{
+ return -1;
+}
+static inline int serial8250_rx_dma(struct uart_8250_port *p)
+{
+ return -1;
+}
+static inline void serial8250_rx_dma_flush(struct uart_8250_port *p) { }
+static inline int serial8250_request_dma(struct uart_8250_port *p)
+{
+ return -1;
+}
+static inline void serial8250_release_dma(struct uart_8250_port *p) { }
+
+static inline bool serial8250_tx_dma_running(struct uart_8250_port *p)
+{
+ return false;
+}
+#endif
+
+static inline int ns16550a_goto_highspeed(struct uart_8250_port *up)
+{
+ unsigned char status;
+
+ status = serial_in(up, 0x04); /* EXCR2 */
+#define PRESL(x) ((x) & 0x30)
+ if (PRESL(status) == 0x10) {
+ /* already in high speed mode */
+ return 0;
+ } else {
+ status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
+ status |= 0x10; /* 1.625 divisor for baud_base --> 921600 */
+ serial_out(up, 0x04, status);
+ }
+ return 1;
+}
+
+static inline int serial_index(struct uart_port *port)
+{
+ return port->minor - 64;
+}