![David Howells](/assets/img/avatar_default.png)
This is a consequence of patch 9ea761bfef52c116fed4715d4043392c2503fe6a. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
1162 lines
28 KiB
C
1162 lines
28 KiB
C
/*
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* linux/drivers/mmc/card/sdio_uart.c - SDIO UART/GPS driver
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*
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* Based on drivers/serial/8250.c and drivers/serial/serial_core.c
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* by Russell King.
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*
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* Author: Nicolas Pitre
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* Created: June 15, 2007
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* Copyright: MontaVista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*/
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/*
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* Note: Although this driver assumes a 16550A-like UART implementation,
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* it is not possible to leverage the common 8250/16550 driver, nor the
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* core UART infrastructure, as they assumes direct access to the hardware
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* registers, often under a spinlock. This is not possible in the SDIO
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* context as SDIO access functions must be able to sleep.
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*
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* Because we need to lock the SDIO host to ensure an exclusive access to
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* the card, we simply rely on that lock to also prevent and serialize
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* concurrent access to the same port.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mutex.h>
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#include <linux/serial_reg.h>
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#include <linux/circ_buf.h>
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#include <linux/gfp.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/mmc/core.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/sdio_func.h>
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#include <linux/mmc/sdio_ids.h>
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#define UART_NR 8 /* Number of UARTs this driver can handle */
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#define UART_XMIT_SIZE PAGE_SIZE
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#define WAKEUP_CHARS 256
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#define circ_empty(circ) ((circ)->head == (circ)->tail)
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#define circ_clear(circ) ((circ)->head = (circ)->tail = 0)
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#define circ_chars_pending(circ) \
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(CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
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#define circ_chars_free(circ) \
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(CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
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struct uart_icount {
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__u32 cts;
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__u32 dsr;
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__u32 rng;
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__u32 dcd;
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__u32 rx;
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__u32 tx;
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__u32 frame;
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__u32 overrun;
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__u32 parity;
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__u32 brk;
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};
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struct sdio_uart_port {
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struct kref kref;
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struct tty_struct *tty;
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unsigned int index;
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unsigned int opened;
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struct mutex open_lock;
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struct sdio_func *func;
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struct mutex func_lock;
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struct task_struct *in_sdio_uart_irq;
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unsigned int regs_offset;
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struct circ_buf xmit;
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spinlock_t write_lock;
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struct uart_icount icount;
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unsigned int uartclk;
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unsigned int mctrl;
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unsigned int read_status_mask;
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unsigned int ignore_status_mask;
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unsigned char x_char;
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unsigned char ier;
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unsigned char lcr;
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};
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static struct sdio_uart_port *sdio_uart_table[UART_NR];
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static DEFINE_SPINLOCK(sdio_uart_table_lock);
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static int sdio_uart_add_port(struct sdio_uart_port *port)
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{
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int index, ret = -EBUSY;
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kref_init(&port->kref);
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mutex_init(&port->open_lock);
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mutex_init(&port->func_lock);
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spin_lock_init(&port->write_lock);
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spin_lock(&sdio_uart_table_lock);
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for (index = 0; index < UART_NR; index++) {
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if (!sdio_uart_table[index]) {
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port->index = index;
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sdio_uart_table[index] = port;
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ret = 0;
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break;
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}
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}
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spin_unlock(&sdio_uart_table_lock);
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return ret;
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}
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static struct sdio_uart_port *sdio_uart_port_get(unsigned index)
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{
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struct sdio_uart_port *port;
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if (index >= UART_NR)
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return NULL;
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spin_lock(&sdio_uart_table_lock);
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port = sdio_uart_table[index];
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if (port)
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kref_get(&port->kref);
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spin_unlock(&sdio_uart_table_lock);
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return port;
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}
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static void sdio_uart_port_destroy(struct kref *kref)
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{
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struct sdio_uart_port *port =
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container_of(kref, struct sdio_uart_port, kref);
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kfree(port);
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}
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static void sdio_uart_port_put(struct sdio_uart_port *port)
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{
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kref_put(&port->kref, sdio_uart_port_destroy);
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}
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static void sdio_uart_port_remove(struct sdio_uart_port *port)
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{
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struct sdio_func *func;
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BUG_ON(sdio_uart_table[port->index] != port);
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spin_lock(&sdio_uart_table_lock);
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sdio_uart_table[port->index] = NULL;
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spin_unlock(&sdio_uart_table_lock);
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/*
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* We're killing a port that potentially still is in use by
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* the tty layer. Be careful to prevent any further access
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* to the SDIO function and arrange for the tty layer to
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* give up on that port ASAP.
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* Beware: the lock ordering is critical.
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*/
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mutex_lock(&port->open_lock);
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mutex_lock(&port->func_lock);
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func = port->func;
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sdio_claim_host(func);
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port->func = NULL;
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mutex_unlock(&port->func_lock);
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if (port->opened)
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tty_hangup(port->tty);
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mutex_unlock(&port->open_lock);
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sdio_release_irq(func);
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sdio_disable_func(func);
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sdio_release_host(func);
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sdio_uart_port_put(port);
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}
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static int sdio_uart_claim_func(struct sdio_uart_port *port)
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{
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mutex_lock(&port->func_lock);
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if (unlikely(!port->func)) {
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mutex_unlock(&port->func_lock);
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return -ENODEV;
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}
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if (likely(port->in_sdio_uart_irq != current))
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sdio_claim_host(port->func);
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mutex_unlock(&port->func_lock);
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return 0;
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}
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static inline void sdio_uart_release_func(struct sdio_uart_port *port)
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{
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if (likely(port->in_sdio_uart_irq != current))
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sdio_release_host(port->func);
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}
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static inline unsigned int sdio_in(struct sdio_uart_port *port, int offset)
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{
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unsigned char c;
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c = sdio_readb(port->func, port->regs_offset + offset, NULL);
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return c;
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}
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static inline void sdio_out(struct sdio_uart_port *port, int offset, int value)
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{
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sdio_writeb(port->func, value, port->regs_offset + offset, NULL);
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}
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static unsigned int sdio_uart_get_mctrl(struct sdio_uart_port *port)
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{
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unsigned char status;
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unsigned int ret;
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status = sdio_in(port, UART_MSR);
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ret = 0;
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if (status & UART_MSR_DCD)
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ret |= TIOCM_CAR;
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if (status & UART_MSR_RI)
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ret |= TIOCM_RNG;
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if (status & UART_MSR_DSR)
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ret |= TIOCM_DSR;
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if (status & UART_MSR_CTS)
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ret |= TIOCM_CTS;
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return ret;
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}
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static void sdio_uart_write_mctrl(struct sdio_uart_port *port, unsigned int mctrl)
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{
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unsigned char mcr = 0;
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if (mctrl & TIOCM_RTS)
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mcr |= UART_MCR_RTS;
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if (mctrl & TIOCM_DTR)
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mcr |= UART_MCR_DTR;
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if (mctrl & TIOCM_OUT1)
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mcr |= UART_MCR_OUT1;
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if (mctrl & TIOCM_OUT2)
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mcr |= UART_MCR_OUT2;
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if (mctrl & TIOCM_LOOP)
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mcr |= UART_MCR_LOOP;
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sdio_out(port, UART_MCR, mcr);
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}
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static inline void sdio_uart_update_mctrl(struct sdio_uart_port *port,
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unsigned int set, unsigned int clear)
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{
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unsigned int old;
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old = port->mctrl;
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port->mctrl = (old & ~clear) | set;
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if (old != port->mctrl)
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sdio_uart_write_mctrl(port, port->mctrl);
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}
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#define sdio_uart_set_mctrl(port, x) sdio_uart_update_mctrl(port, x, 0)
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#define sdio_uart_clear_mctrl(port, x) sdio_uart_update_mctrl(port, 0, x)
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static void sdio_uart_change_speed(struct sdio_uart_port *port,
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struct ktermios *termios,
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struct ktermios *old)
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{
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unsigned char cval, fcr = 0;
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unsigned int baud, quot;
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switch (termios->c_cflag & CSIZE) {
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case CS5:
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cval = UART_LCR_WLEN5;
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break;
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case CS6:
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cval = UART_LCR_WLEN6;
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break;
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case CS7:
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cval = UART_LCR_WLEN7;
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break;
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default:
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case CS8:
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cval = UART_LCR_WLEN8;
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break;
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}
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if (termios->c_cflag & CSTOPB)
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cval |= UART_LCR_STOP;
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if (termios->c_cflag & PARENB)
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cval |= UART_LCR_PARITY;
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if (!(termios->c_cflag & PARODD))
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cval |= UART_LCR_EPAR;
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for (;;) {
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baud = tty_termios_baud_rate(termios);
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if (baud == 0)
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baud = 9600; /* Special case: B0 rate. */
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if (baud <= port->uartclk)
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break;
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/*
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* Oops, the quotient was zero. Try again with the old
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* baud rate if possible, otherwise default to 9600.
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*/
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termios->c_cflag &= ~CBAUD;
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if (old) {
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termios->c_cflag |= old->c_cflag & CBAUD;
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old = NULL;
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} else
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termios->c_cflag |= B9600;
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}
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quot = (2 * port->uartclk + baud) / (2 * baud);
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if (baud < 2400)
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fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
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else
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fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
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port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
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if (termios->c_iflag & INPCK)
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port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
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if (termios->c_iflag & (BRKINT | PARMRK))
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port->read_status_mask |= UART_LSR_BI;
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/*
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* Characters to ignore
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*/
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port->ignore_status_mask = 0;
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if (termios->c_iflag & IGNPAR)
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port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
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if (termios->c_iflag & IGNBRK) {
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port->ignore_status_mask |= UART_LSR_BI;
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/*
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* If we're ignoring parity and break indicators,
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* ignore overruns too (for real raw support).
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*/
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if (termios->c_iflag & IGNPAR)
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port->ignore_status_mask |= UART_LSR_OE;
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}
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/*
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* ignore all characters if CREAD is not set
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*/
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if ((termios->c_cflag & CREAD) == 0)
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port->ignore_status_mask |= UART_LSR_DR;
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/*
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* CTS flow control flag and modem status interrupts
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*/
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port->ier &= ~UART_IER_MSI;
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if ((termios->c_cflag & CRTSCTS) || !(termios->c_cflag & CLOCAL))
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port->ier |= UART_IER_MSI;
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port->lcr = cval;
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sdio_out(port, UART_IER, port->ier);
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sdio_out(port, UART_LCR, cval | UART_LCR_DLAB);
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sdio_out(port, UART_DLL, quot & 0xff);
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sdio_out(port, UART_DLM, quot >> 8);
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sdio_out(port, UART_LCR, cval);
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sdio_out(port, UART_FCR, fcr);
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sdio_uart_write_mctrl(port, port->mctrl);
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}
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static void sdio_uart_start_tx(struct sdio_uart_port *port)
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{
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if (!(port->ier & UART_IER_THRI)) {
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port->ier |= UART_IER_THRI;
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sdio_out(port, UART_IER, port->ier);
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}
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}
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static void sdio_uart_stop_tx(struct sdio_uart_port *port)
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{
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if (port->ier & UART_IER_THRI) {
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port->ier &= ~UART_IER_THRI;
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sdio_out(port, UART_IER, port->ier);
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}
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}
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static void sdio_uart_stop_rx(struct sdio_uart_port *port)
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{
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port->ier &= ~UART_IER_RLSI;
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port->read_status_mask &= ~UART_LSR_DR;
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sdio_out(port, UART_IER, port->ier);
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}
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static void sdio_uart_receive_chars(struct sdio_uart_port *port, unsigned int *status)
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{
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struct tty_struct *tty = port->tty;
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unsigned int ch, flag;
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int max_count = 256;
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do {
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ch = sdio_in(port, UART_RX);
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flag = TTY_NORMAL;
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port->icount.rx++;
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if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
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UART_LSR_FE | UART_LSR_OE))) {
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/*
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* For statistics only
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*/
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if (*status & UART_LSR_BI) {
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*status &= ~(UART_LSR_FE | UART_LSR_PE);
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port->icount.brk++;
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} else if (*status & UART_LSR_PE)
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port->icount.parity++;
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else if (*status & UART_LSR_FE)
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port->icount.frame++;
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if (*status & UART_LSR_OE)
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port->icount.overrun++;
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/*
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* Mask off conditions which should be ignored.
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*/
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*status &= port->read_status_mask;
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if (*status & UART_LSR_BI) {
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flag = TTY_BREAK;
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} else if (*status & UART_LSR_PE)
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flag = TTY_PARITY;
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else if (*status & UART_LSR_FE)
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flag = TTY_FRAME;
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}
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if ((*status & port->ignore_status_mask & ~UART_LSR_OE) == 0)
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tty_insert_flip_char(tty, ch, flag);
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/*
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* Overrun is special. Since it's reported immediately,
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* it doesn't affect the current character.
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*/
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if (*status & ~port->ignore_status_mask & UART_LSR_OE)
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tty_insert_flip_char(tty, 0, TTY_OVERRUN);
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*status = sdio_in(port, UART_LSR);
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} while ((*status & UART_LSR_DR) && (max_count-- > 0));
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tty_flip_buffer_push(tty);
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}
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static void sdio_uart_transmit_chars(struct sdio_uart_port *port)
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{
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struct circ_buf *xmit = &port->xmit;
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int count;
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if (port->x_char) {
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sdio_out(port, UART_TX, port->x_char);
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port->icount.tx++;
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port->x_char = 0;
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return;
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}
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if (circ_empty(xmit) || port->tty->stopped || port->tty->hw_stopped) {
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sdio_uart_stop_tx(port);
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return;
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}
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count = 16;
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do {
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sdio_out(port, UART_TX, xmit->buf[xmit->tail]);
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xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
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port->icount.tx++;
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if (circ_empty(xmit))
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break;
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} while (--count > 0);
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if (circ_chars_pending(xmit) < WAKEUP_CHARS)
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tty_wakeup(port->tty);
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if (circ_empty(xmit))
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sdio_uart_stop_tx(port);
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}
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static void sdio_uart_check_modem_status(struct sdio_uart_port *port)
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{
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int status;
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status = sdio_in(port, UART_MSR);
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if ((status & UART_MSR_ANY_DELTA) == 0)
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return;
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if (status & UART_MSR_TERI)
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port->icount.rng++;
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if (status & UART_MSR_DDSR)
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port->icount.dsr++;
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if (status & UART_MSR_DDCD)
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port->icount.dcd++;
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if (status & UART_MSR_DCTS) {
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port->icount.cts++;
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if (port->tty->termios->c_cflag & CRTSCTS) {
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int cts = (status & UART_MSR_CTS);
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if (port->tty->hw_stopped) {
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if (cts) {
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port->tty->hw_stopped = 0;
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sdio_uart_start_tx(port);
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tty_wakeup(port->tty);
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}
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} else {
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if (!cts) {
|
|
port->tty->hw_stopped = 1;
|
|
sdio_uart_stop_tx(port);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This handles the interrupt from one port.
|
|
*/
|
|
static void sdio_uart_irq(struct sdio_func *func)
|
|
{
|
|
struct sdio_uart_port *port = sdio_get_drvdata(func);
|
|
unsigned int iir, lsr;
|
|
|
|
/*
|
|
* In a few places sdio_uart_irq() is called directly instead of
|
|
* waiting for the actual interrupt to be raised and the SDIO IRQ
|
|
* thread scheduled in order to reduce latency. However, some
|
|
* interaction with the tty core may end up calling us back
|
|
* (serial echo, flow control, etc.) through those same places
|
|
* causing undesirable effects. Let's stop the recursion here.
|
|
*/
|
|
if (unlikely(port->in_sdio_uart_irq == current))
|
|
return;
|
|
|
|
iir = sdio_in(port, UART_IIR);
|
|
if (iir & UART_IIR_NO_INT)
|
|
return;
|
|
|
|
port->in_sdio_uart_irq = current;
|
|
lsr = sdio_in(port, UART_LSR);
|
|
if (lsr & UART_LSR_DR)
|
|
sdio_uart_receive_chars(port, &lsr);
|
|
sdio_uart_check_modem_status(port);
|
|
if (lsr & UART_LSR_THRE)
|
|
sdio_uart_transmit_chars(port);
|
|
port->in_sdio_uart_irq = NULL;
|
|
}
|
|
|
|
static int sdio_uart_startup(struct sdio_uart_port *port)
|
|
{
|
|
unsigned long page;
|
|
int ret;
|
|
|
|
/*
|
|
* Set the TTY IO error marker - we will only clear this
|
|
* once we have successfully opened the port.
|
|
*/
|
|
set_bit(TTY_IO_ERROR, &port->tty->flags);
|
|
|
|
/* Initialise and allocate the transmit buffer. */
|
|
page = __get_free_page(GFP_KERNEL);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
port->xmit.buf = (unsigned char *)page;
|
|
circ_clear(&port->xmit);
|
|
|
|
ret = sdio_uart_claim_func(port);
|
|
if (ret)
|
|
goto err1;
|
|
ret = sdio_enable_func(port->func);
|
|
if (ret)
|
|
goto err2;
|
|
ret = sdio_claim_irq(port->func, sdio_uart_irq);
|
|
if (ret)
|
|
goto err3;
|
|
|
|
/*
|
|
* Clear the FIFO buffers and disable them.
|
|
* (they will be reenabled in sdio_change_speed())
|
|
*/
|
|
sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO);
|
|
sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO |
|
|
UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
|
|
sdio_out(port, UART_FCR, 0);
|
|
|
|
/*
|
|
* Clear the interrupt registers.
|
|
*/
|
|
(void) sdio_in(port, UART_LSR);
|
|
(void) sdio_in(port, UART_RX);
|
|
(void) sdio_in(port, UART_IIR);
|
|
(void) sdio_in(port, UART_MSR);
|
|
|
|
/*
|
|
* Now, initialize the UART
|
|
*/
|
|
sdio_out(port, UART_LCR, UART_LCR_WLEN8);
|
|
|
|
port->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE;
|
|
port->mctrl = TIOCM_OUT2;
|
|
|
|
sdio_uart_change_speed(port, port->tty->termios, NULL);
|
|
|
|
if (port->tty->termios->c_cflag & CBAUD)
|
|
sdio_uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR);
|
|
|
|
if (port->tty->termios->c_cflag & CRTSCTS)
|
|
if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS))
|
|
port->tty->hw_stopped = 1;
|
|
|
|
clear_bit(TTY_IO_ERROR, &port->tty->flags);
|
|
|
|
/* Kick the IRQ handler once while we're still holding the host lock */
|
|
sdio_uart_irq(port->func);
|
|
|
|
sdio_uart_release_func(port);
|
|
return 0;
|
|
|
|
err3:
|
|
sdio_disable_func(port->func);
|
|
err2:
|
|
sdio_uart_release_func(port);
|
|
err1:
|
|
free_page((unsigned long)port->xmit.buf);
|
|
return ret;
|
|
}
|
|
|
|
static void sdio_uart_shutdown(struct sdio_uart_port *port)
|
|
{
|
|
int ret;
|
|
|
|
ret = sdio_uart_claim_func(port);
|
|
if (ret)
|
|
goto skip;
|
|
|
|
sdio_uart_stop_rx(port);
|
|
|
|
/* TODO: wait here for TX FIFO to drain */
|
|
|
|
/* Turn off DTR and RTS early. */
|
|
if (port->tty->termios->c_cflag & HUPCL)
|
|
sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
|
|
|
|
/* Disable interrupts from this port */
|
|
sdio_release_irq(port->func);
|
|
port->ier = 0;
|
|
sdio_out(port, UART_IER, 0);
|
|
|
|
sdio_uart_clear_mctrl(port, TIOCM_OUT2);
|
|
|
|
/* Disable break condition and FIFOs. */
|
|
port->lcr &= ~UART_LCR_SBC;
|
|
sdio_out(port, UART_LCR, port->lcr);
|
|
sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO |
|
|
UART_FCR_CLEAR_RCVR |
|
|
UART_FCR_CLEAR_XMIT);
|
|
sdio_out(port, UART_FCR, 0);
|
|
|
|
sdio_disable_func(port->func);
|
|
|
|
sdio_uart_release_func(port);
|
|
|
|
skip:
|
|
/* Free the transmit buffer page. */
|
|
free_page((unsigned long)port->xmit.buf);
|
|
}
|
|
|
|
static int sdio_uart_open (struct tty_struct *tty, struct file * filp)
|
|
{
|
|
struct sdio_uart_port *port;
|
|
int ret;
|
|
|
|
port = sdio_uart_port_get(tty->index);
|
|
if (!port)
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&port->open_lock);
|
|
|
|
/*
|
|
* Make sure not to mess up with a dead port
|
|
* which has not been closed yet.
|
|
*/
|
|
if (tty->driver_data && tty->driver_data != port) {
|
|
mutex_unlock(&port->open_lock);
|
|
sdio_uart_port_put(port);
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (!port->opened) {
|
|
tty->driver_data = port;
|
|
port->tty = tty;
|
|
ret = sdio_uart_startup(port);
|
|
if (ret) {
|
|
tty->driver_data = NULL;
|
|
port->tty = NULL;
|
|
mutex_unlock(&port->open_lock);
|
|
sdio_uart_port_put(port);
|
|
return ret;
|
|
}
|
|
}
|
|
port->opened++;
|
|
mutex_unlock(&port->open_lock);
|
|
return 0;
|
|
}
|
|
|
|
static void sdio_uart_close(struct tty_struct *tty, struct file * filp)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
|
|
if (!port)
|
|
return;
|
|
|
|
mutex_lock(&port->open_lock);
|
|
BUG_ON(!port->opened);
|
|
|
|
/*
|
|
* This is messy. The tty layer calls us even when open()
|
|
* returned an error. Ignore this close request if tty->count
|
|
* is larger than port->count.
|
|
*/
|
|
if (tty->count > port->opened) {
|
|
mutex_unlock(&port->open_lock);
|
|
return;
|
|
}
|
|
|
|
if (--port->opened == 0) {
|
|
tty->closing = 1;
|
|
sdio_uart_shutdown(port);
|
|
tty_ldisc_flush(tty);
|
|
port->tty = NULL;
|
|
tty->driver_data = NULL;
|
|
tty->closing = 0;
|
|
}
|
|
mutex_unlock(&port->open_lock);
|
|
sdio_uart_port_put(port);
|
|
}
|
|
|
|
static int sdio_uart_write(struct tty_struct * tty, const unsigned char *buf,
|
|
int count)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
struct circ_buf *circ = &port->xmit;
|
|
int c, ret = 0;
|
|
|
|
if (!port->func)
|
|
return -ENODEV;
|
|
|
|
spin_lock(&port->write_lock);
|
|
while (1) {
|
|
c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE);
|
|
if (count < c)
|
|
c = count;
|
|
if (c <= 0)
|
|
break;
|
|
memcpy(circ->buf + circ->head, buf, c);
|
|
circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1);
|
|
buf += c;
|
|
count -= c;
|
|
ret += c;
|
|
}
|
|
spin_unlock(&port->write_lock);
|
|
|
|
if ( !(port->ier & UART_IER_THRI)) {
|
|
int err = sdio_uart_claim_func(port);
|
|
if (!err) {
|
|
sdio_uart_start_tx(port);
|
|
sdio_uart_irq(port->func);
|
|
sdio_uart_release_func(port);
|
|
} else
|
|
ret = err;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sdio_uart_write_room(struct tty_struct *tty)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
return port ? circ_chars_free(&port->xmit) : 0;
|
|
}
|
|
|
|
static int sdio_uart_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
return port ? circ_chars_pending(&port->xmit) : 0;
|
|
}
|
|
|
|
static void sdio_uart_send_xchar(struct tty_struct *tty, char ch)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
|
|
port->x_char = ch;
|
|
if (ch && !(port->ier & UART_IER_THRI)) {
|
|
if (sdio_uart_claim_func(port) != 0)
|
|
return;
|
|
sdio_uart_start_tx(port);
|
|
sdio_uart_irq(port->func);
|
|
sdio_uart_release_func(port);
|
|
}
|
|
}
|
|
|
|
static void sdio_uart_throttle(struct tty_struct *tty)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
|
|
if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS))
|
|
return;
|
|
|
|
if (sdio_uart_claim_func(port) != 0)
|
|
return;
|
|
|
|
if (I_IXOFF(tty)) {
|
|
port->x_char = STOP_CHAR(tty);
|
|
sdio_uart_start_tx(port);
|
|
}
|
|
|
|
if (tty->termios->c_cflag & CRTSCTS)
|
|
sdio_uart_clear_mctrl(port, TIOCM_RTS);
|
|
|
|
sdio_uart_irq(port->func);
|
|
sdio_uart_release_func(port);
|
|
}
|
|
|
|
static void sdio_uart_unthrottle(struct tty_struct *tty)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
|
|
if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS))
|
|
return;
|
|
|
|
if (sdio_uart_claim_func(port) != 0)
|
|
return;
|
|
|
|
if (I_IXOFF(tty)) {
|
|
if (port->x_char) {
|
|
port->x_char = 0;
|
|
} else {
|
|
port->x_char = START_CHAR(tty);
|
|
sdio_uart_start_tx(port);
|
|
}
|
|
}
|
|
|
|
if (tty->termios->c_cflag & CRTSCTS)
|
|
sdio_uart_set_mctrl(port, TIOCM_RTS);
|
|
|
|
sdio_uart_irq(port->func);
|
|
sdio_uart_release_func(port);
|
|
}
|
|
|
|
static void sdio_uart_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
unsigned int cflag = tty->termios->c_cflag;
|
|
|
|
#define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
|
|
|
|
if ((cflag ^ old_termios->c_cflag) == 0 &&
|
|
RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0)
|
|
return;
|
|
|
|
if (sdio_uart_claim_func(port) != 0)
|
|
return;
|
|
|
|
sdio_uart_change_speed(port, tty->termios, old_termios);
|
|
|
|
/* Handle transition to B0 status */
|
|
if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD))
|
|
sdio_uart_clear_mctrl(port, TIOCM_RTS | TIOCM_DTR);
|
|
|
|
/* Handle transition away from B0 status */
|
|
if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
|
|
unsigned int mask = TIOCM_DTR;
|
|
if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags))
|
|
mask |= TIOCM_RTS;
|
|
sdio_uart_set_mctrl(port, mask);
|
|
}
|
|
|
|
/* Handle turning off CRTSCTS */
|
|
if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) {
|
|
tty->hw_stopped = 0;
|
|
sdio_uart_start_tx(port);
|
|
}
|
|
|
|
/* Handle turning on CRTSCTS */
|
|
if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) {
|
|
if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) {
|
|
tty->hw_stopped = 1;
|
|
sdio_uart_stop_tx(port);
|
|
}
|
|
}
|
|
|
|
sdio_uart_release_func(port);
|
|
}
|
|
|
|
static int sdio_uart_break_ctl(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
int result;
|
|
|
|
result = sdio_uart_claim_func(port);
|
|
if (result != 0)
|
|
return result;
|
|
|
|
if (break_state == -1)
|
|
port->lcr |= UART_LCR_SBC;
|
|
else
|
|
port->lcr &= ~UART_LCR_SBC;
|
|
sdio_out(port, UART_LCR, port->lcr);
|
|
|
|
sdio_uart_release_func(port);
|
|
return 0;
|
|
}
|
|
|
|
static int sdio_uart_tiocmget(struct tty_struct *tty, struct file *file)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
int result;
|
|
|
|
result = sdio_uart_claim_func(port);
|
|
if (!result) {
|
|
result = port->mctrl | sdio_uart_get_mctrl(port);
|
|
sdio_uart_release_func(port);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static int sdio_uart_tiocmset(struct tty_struct *tty, struct file *file,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct sdio_uart_port *port = tty->driver_data;
|
|
int result;
|
|
|
|
result =sdio_uart_claim_func(port);
|
|
if(!result) {
|
|
sdio_uart_update_mctrl(port, set, clear);
|
|
sdio_uart_release_func(port);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static int sdio_uart_read_proc(char *page, char **start, off_t off,
|
|
int count, int *eof, void *data)
|
|
{
|
|
int i, len = 0;
|
|
off_t begin = 0;
|
|
|
|
len += sprintf(page, "serinfo:1.0 driver%s%s revision:%s\n",
|
|
"", "", "");
|
|
for (i = 0; i < UART_NR && len < PAGE_SIZE - 96; i++) {
|
|
struct sdio_uart_port *port = sdio_uart_port_get(i);
|
|
if (port) {
|
|
len += sprintf(page+len, "%d: uart:SDIO", i);
|
|
if(capable(CAP_SYS_ADMIN)) {
|
|
len += sprintf(page + len, " tx:%d rx:%d",
|
|
port->icount.tx, port->icount.rx);
|
|
if (port->icount.frame)
|
|
len += sprintf(page + len, " fe:%d",
|
|
port->icount.frame);
|
|
if (port->icount.parity)
|
|
len += sprintf(page + len, " pe:%d",
|
|
port->icount.parity);
|
|
if (port->icount.brk)
|
|
len += sprintf(page + len, " brk:%d",
|
|
port->icount.brk);
|
|
if (port->icount.overrun)
|
|
len += sprintf(page + len, " oe:%d",
|
|
port->icount.overrun);
|
|
if (port->icount.cts)
|
|
len += sprintf(page + len, " cts:%d",
|
|
port->icount.cts);
|
|
if (port->icount.dsr)
|
|
len += sprintf(page + len, " dsr:%d",
|
|
port->icount.dsr);
|
|
if (port->icount.rng)
|
|
len += sprintf(page + len, " rng:%d",
|
|
port->icount.rng);
|
|
if (port->icount.dcd)
|
|
len += sprintf(page + len, " dcd:%d",
|
|
port->icount.dcd);
|
|
}
|
|
strcat(page, "\n");
|
|
len++;
|
|
sdio_uart_port_put(port);
|
|
}
|
|
|
|
if (len + begin > off + count)
|
|
goto done;
|
|
if (len + begin < off) {
|
|
begin += len;
|
|
len = 0;
|
|
}
|
|
}
|
|
*eof = 1;
|
|
|
|
done:
|
|
if (off >= len + begin)
|
|
return 0;
|
|
*start = page + (off - begin);
|
|
return (count < begin + len - off) ? count : (begin + len - off);
|
|
}
|
|
|
|
static const struct tty_operations sdio_uart_ops = {
|
|
.open = sdio_uart_open,
|
|
.close = sdio_uart_close,
|
|
.write = sdio_uart_write,
|
|
.write_room = sdio_uart_write_room,
|
|
.chars_in_buffer = sdio_uart_chars_in_buffer,
|
|
.send_xchar = sdio_uart_send_xchar,
|
|
.throttle = sdio_uart_throttle,
|
|
.unthrottle = sdio_uart_unthrottle,
|
|
.set_termios = sdio_uart_set_termios,
|
|
.break_ctl = sdio_uart_break_ctl,
|
|
.tiocmget = sdio_uart_tiocmget,
|
|
.tiocmset = sdio_uart_tiocmset,
|
|
.read_proc = sdio_uart_read_proc,
|
|
};
|
|
|
|
static struct tty_driver *sdio_uart_tty_driver;
|
|
|
|
static int sdio_uart_probe(struct sdio_func *func,
|
|
const struct sdio_device_id *id)
|
|
{
|
|
struct sdio_uart_port *port;
|
|
int ret;
|
|
|
|
port = kzalloc(sizeof(struct sdio_uart_port), GFP_KERNEL);
|
|
if (!port)
|
|
return -ENOMEM;
|
|
|
|
if (func->class == SDIO_CLASS_UART) {
|
|
printk(KERN_WARNING "%s: need info on UART class basic setup\n",
|
|
sdio_func_id(func));
|
|
kfree(port);
|
|
return -ENOSYS;
|
|
} else if (func->class == SDIO_CLASS_GPS) {
|
|
/*
|
|
* We need tuple 0x91. It contains SUBTPL_SIOREG
|
|
* and SUBTPL_RCVCAPS.
|
|
*/
|
|
struct sdio_func_tuple *tpl;
|
|
for (tpl = func->tuples; tpl; tpl = tpl->next) {
|
|
if (tpl->code != 0x91)
|
|
continue;
|
|
if (tpl->size < 10)
|
|
continue;
|
|
if (tpl->data[1] == 0) /* SUBTPL_SIOREG */
|
|
break;
|
|
}
|
|
if (!tpl) {
|
|
printk(KERN_WARNING
|
|
"%s: can't find tuple 0x91 subtuple 0 (SUBTPL_SIOREG) for GPS class\n",
|
|
sdio_func_id(func));
|
|
kfree(port);
|
|
return -EINVAL;
|
|
}
|
|
printk(KERN_DEBUG "%s: Register ID = 0x%02x, Exp ID = 0x%02x\n",
|
|
sdio_func_id(func), tpl->data[2], tpl->data[3]);
|
|
port->regs_offset = (tpl->data[4] << 0) |
|
|
(tpl->data[5] << 8) |
|
|
(tpl->data[6] << 16);
|
|
printk(KERN_DEBUG "%s: regs offset = 0x%x\n",
|
|
sdio_func_id(func), port->regs_offset);
|
|
port->uartclk = tpl->data[7] * 115200;
|
|
if (port->uartclk == 0)
|
|
port->uartclk = 115200;
|
|
printk(KERN_DEBUG "%s: clk %d baudcode %u 4800-div %u\n",
|
|
sdio_func_id(func), port->uartclk,
|
|
tpl->data[7], tpl->data[8] | (tpl->data[9] << 8));
|
|
} else {
|
|
kfree(port);
|
|
return -EINVAL;
|
|
}
|
|
|
|
port->func = func;
|
|
sdio_set_drvdata(func, port);
|
|
|
|
ret = sdio_uart_add_port(port);
|
|
if (ret) {
|
|
kfree(port);
|
|
} else {
|
|
struct device *dev;
|
|
dev = tty_register_device(sdio_uart_tty_driver, port->index, &func->dev);
|
|
if (IS_ERR(dev)) {
|
|
sdio_uart_port_remove(port);
|
|
ret = PTR_ERR(dev);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void sdio_uart_remove(struct sdio_func *func)
|
|
{
|
|
struct sdio_uart_port *port = sdio_get_drvdata(func);
|
|
|
|
tty_unregister_device(sdio_uart_tty_driver, port->index);
|
|
sdio_uart_port_remove(port);
|
|
}
|
|
|
|
static const struct sdio_device_id sdio_uart_ids[] = {
|
|
{ SDIO_DEVICE_CLASS(SDIO_CLASS_UART) },
|
|
{ SDIO_DEVICE_CLASS(SDIO_CLASS_GPS) },
|
|
{ /* end: all zeroes */ },
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(sdio, sdio_uart_ids);
|
|
|
|
static struct sdio_driver sdio_uart_driver = {
|
|
.probe = sdio_uart_probe,
|
|
.remove = sdio_uart_remove,
|
|
.name = "sdio_uart",
|
|
.id_table = sdio_uart_ids,
|
|
};
|
|
|
|
static int __init sdio_uart_init(void)
|
|
{
|
|
int ret;
|
|
struct tty_driver *tty_drv;
|
|
|
|
sdio_uart_tty_driver = tty_drv = alloc_tty_driver(UART_NR);
|
|
if (!tty_drv)
|
|
return -ENOMEM;
|
|
|
|
tty_drv->owner = THIS_MODULE;
|
|
tty_drv->driver_name = "sdio_uart";
|
|
tty_drv->name = "ttySDIO";
|
|
tty_drv->major = 0; /* dynamically allocated */
|
|
tty_drv->minor_start = 0;
|
|
tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
|
|
tty_drv->subtype = SERIAL_TYPE_NORMAL;
|
|
tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
|
|
tty_drv->init_termios = tty_std_termios;
|
|
tty_drv->init_termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL;
|
|
tty_drv->init_termios.c_ispeed = 4800;
|
|
tty_drv->init_termios.c_ospeed = 4800;
|
|
tty_set_operations(tty_drv, &sdio_uart_ops);
|
|
|
|
ret = tty_register_driver(tty_drv);
|
|
if (ret)
|
|
goto err1;
|
|
|
|
ret = sdio_register_driver(&sdio_uart_driver);
|
|
if (ret)
|
|
goto err2;
|
|
|
|
return 0;
|
|
|
|
err2:
|
|
tty_unregister_driver(tty_drv);
|
|
err1:
|
|
put_tty_driver(tty_drv);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit sdio_uart_exit(void)
|
|
{
|
|
sdio_unregister_driver(&sdio_uart_driver);
|
|
tty_unregister_driver(sdio_uart_tty_driver);
|
|
put_tty_driver(sdio_uart_tty_driver);
|
|
}
|
|
|
|
module_init(sdio_uart_init);
|
|
module_exit(sdio_uart_exit);
|
|
|
|
MODULE_AUTHOR("Nicolas Pitre");
|
|
MODULE_LICENSE("GPL");
|