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482 lines
12 KiB
482 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2007 Google, Inc. |
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* Copyright (C) 2012 Intel, Inc. |
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* Copyright (C) 2017 Imagination Technologies Ltd. |
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*/ |
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#include <linux/console.h> |
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#include <linux/interrupt.h> |
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#include <linux/platform_device.h> |
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#include <linux/tty.h> |
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#include <linux/tty_flip.h> |
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#include <linux/slab.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/goldfish.h> |
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#include <linux/mm.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/serial_core.h> |
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/* Goldfish tty register's offsets */ |
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#define GOLDFISH_TTY_REG_BYTES_READY 0x04 |
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#define GOLDFISH_TTY_REG_CMD 0x08 |
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#define GOLDFISH_TTY_REG_DATA_PTR 0x10 |
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#define GOLDFISH_TTY_REG_DATA_LEN 0x14 |
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#define GOLDFISH_TTY_REG_DATA_PTR_HIGH 0x18 |
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#define GOLDFISH_TTY_REG_VERSION 0x20 |
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/* Goldfish tty commands */ |
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#define GOLDFISH_TTY_CMD_INT_DISABLE 0 |
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#define GOLDFISH_TTY_CMD_INT_ENABLE 1 |
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#define GOLDFISH_TTY_CMD_WRITE_BUFFER 2 |
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#define GOLDFISH_TTY_CMD_READ_BUFFER 3 |
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struct goldfish_tty { |
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struct tty_port port; |
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spinlock_t lock; |
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void __iomem *base; |
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u32 irq; |
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int opencount; |
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struct console console; |
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u32 version; |
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struct device *dev; |
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}; |
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static DEFINE_MUTEX(goldfish_tty_lock); |
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static struct tty_driver *goldfish_tty_driver; |
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static u32 goldfish_tty_line_count = 8; |
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static u32 goldfish_tty_current_line_count; |
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static struct goldfish_tty *goldfish_ttys; |
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static void do_rw_io(struct goldfish_tty *qtty, |
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unsigned long address, |
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unsigned int count, |
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int is_write) |
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{ |
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unsigned long irq_flags; |
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void __iomem *base = qtty->base; |
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spin_lock_irqsave(&qtty->lock, irq_flags); |
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gf_write_ptr((void *)address, base + GOLDFISH_TTY_REG_DATA_PTR, |
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base + GOLDFISH_TTY_REG_DATA_PTR_HIGH); |
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__raw_writel(count, base + GOLDFISH_TTY_REG_DATA_LEN); |
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if (is_write) |
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__raw_writel(GOLDFISH_TTY_CMD_WRITE_BUFFER, |
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base + GOLDFISH_TTY_REG_CMD); |
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else |
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__raw_writel(GOLDFISH_TTY_CMD_READ_BUFFER, |
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base + GOLDFISH_TTY_REG_CMD); |
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spin_unlock_irqrestore(&qtty->lock, irq_flags); |
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} |
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static void goldfish_tty_rw(struct goldfish_tty *qtty, |
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unsigned long addr, |
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unsigned int count, |
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int is_write) |
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{ |
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dma_addr_t dma_handle; |
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enum dma_data_direction dma_dir; |
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dma_dir = (is_write ? DMA_TO_DEVICE : DMA_FROM_DEVICE); |
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if (qtty->version > 0) { |
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/* |
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* Goldfish TTY for Ranchu platform uses |
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* physical addresses and DMA for read/write operations |
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*/ |
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unsigned long addr_end = addr + count; |
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while (addr < addr_end) { |
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unsigned long pg_end = (addr & PAGE_MASK) + PAGE_SIZE; |
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unsigned long next = |
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pg_end < addr_end ? pg_end : addr_end; |
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unsigned long avail = next - addr; |
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/* |
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* Map the buffer's virtual address to the DMA address |
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* so the buffer can be accessed by the device. |
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*/ |
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dma_handle = dma_map_single(qtty->dev, (void *)addr, |
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avail, dma_dir); |
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if (dma_mapping_error(qtty->dev, dma_handle)) { |
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dev_err(qtty->dev, "tty: DMA mapping error.\n"); |
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return; |
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} |
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do_rw_io(qtty, dma_handle, avail, is_write); |
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/* |
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* Unmap the previously mapped region after |
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* the completion of the read/write operation. |
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*/ |
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dma_unmap_single(qtty->dev, dma_handle, avail, dma_dir); |
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addr += avail; |
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} |
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} else { |
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/* |
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* Old style Goldfish TTY used on the Goldfish platform |
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* uses virtual addresses. |
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*/ |
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do_rw_io(qtty, addr, count, is_write); |
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} |
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} |
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static void goldfish_tty_do_write(int line, const char *buf, |
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unsigned int count) |
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{ |
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struct goldfish_tty *qtty = &goldfish_ttys[line]; |
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unsigned long address = (unsigned long)(void *)buf; |
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goldfish_tty_rw(qtty, address, count, 1); |
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} |
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static irqreturn_t goldfish_tty_interrupt(int irq, void *dev_id) |
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{ |
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struct goldfish_tty *qtty = dev_id; |
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void __iomem *base = qtty->base; |
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unsigned long address; |
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unsigned char *buf; |
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u32 count; |
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count = __raw_readl(base + GOLDFISH_TTY_REG_BYTES_READY); |
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if (count == 0) |
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return IRQ_NONE; |
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count = tty_prepare_flip_string(&qtty->port, &buf, count); |
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address = (unsigned long)(void *)buf; |
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goldfish_tty_rw(qtty, address, count, 0); |
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tty_schedule_flip(&qtty->port); |
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return IRQ_HANDLED; |
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} |
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static int goldfish_tty_activate(struct tty_port *port, struct tty_struct *tty) |
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{ |
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struct goldfish_tty *qtty = container_of(port, struct goldfish_tty, |
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port); |
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__raw_writel(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_REG_CMD); |
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return 0; |
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} |
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static void goldfish_tty_shutdown(struct tty_port *port) |
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{ |
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struct goldfish_tty *qtty = container_of(port, struct goldfish_tty, |
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port); |
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__raw_writel(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_REG_CMD); |
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} |
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static int goldfish_tty_open(struct tty_struct *tty, struct file *filp) |
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{ |
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struct goldfish_tty *qtty = &goldfish_ttys[tty->index]; |
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return tty_port_open(&qtty->port, tty, filp); |
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} |
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static void goldfish_tty_close(struct tty_struct *tty, struct file *filp) |
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{ |
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tty_port_close(tty->port, tty, filp); |
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} |
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static void goldfish_tty_hangup(struct tty_struct *tty) |
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{ |
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tty_port_hangup(tty->port); |
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} |
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static int goldfish_tty_write(struct tty_struct *tty, const unsigned char *buf, |
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int count) |
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{ |
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goldfish_tty_do_write(tty->index, buf, count); |
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return count; |
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} |
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static unsigned int goldfish_tty_write_room(struct tty_struct *tty) |
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{ |
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return 0x10000; |
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} |
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static unsigned int goldfish_tty_chars_in_buffer(struct tty_struct *tty) |
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{ |
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struct goldfish_tty *qtty = &goldfish_ttys[tty->index]; |
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void __iomem *base = qtty->base; |
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return __raw_readl(base + GOLDFISH_TTY_REG_BYTES_READY); |
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} |
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static void goldfish_tty_console_write(struct console *co, const char *b, |
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unsigned count) |
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{ |
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goldfish_tty_do_write(co->index, b, count); |
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} |
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static struct tty_driver *goldfish_tty_console_device(struct console *c, |
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int *index) |
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{ |
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*index = c->index; |
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return goldfish_tty_driver; |
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} |
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static int goldfish_tty_console_setup(struct console *co, char *options) |
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{ |
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if ((unsigned)co->index >= goldfish_tty_line_count) |
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return -ENODEV; |
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if (!goldfish_ttys[co->index].base) |
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return -ENODEV; |
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return 0; |
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} |
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static const struct tty_port_operations goldfish_port_ops = { |
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.activate = goldfish_tty_activate, |
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.shutdown = goldfish_tty_shutdown |
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}; |
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static const struct tty_operations goldfish_tty_ops = { |
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.open = goldfish_tty_open, |
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.close = goldfish_tty_close, |
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.hangup = goldfish_tty_hangup, |
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.write = goldfish_tty_write, |
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.write_room = goldfish_tty_write_room, |
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.chars_in_buffer = goldfish_tty_chars_in_buffer, |
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}; |
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static int goldfish_tty_create_driver(void) |
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{ |
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int ret; |
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struct tty_driver *tty; |
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goldfish_ttys = kcalloc(goldfish_tty_line_count, |
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sizeof(*goldfish_ttys), |
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GFP_KERNEL); |
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if (goldfish_ttys == NULL) { |
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ret = -ENOMEM; |
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goto err_alloc_goldfish_ttys_failed; |
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} |
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tty = alloc_tty_driver(goldfish_tty_line_count); |
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if (tty == NULL) { |
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ret = -ENOMEM; |
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goto err_alloc_tty_driver_failed; |
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} |
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tty->driver_name = "goldfish"; |
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tty->name = "ttyGF"; |
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tty->type = TTY_DRIVER_TYPE_SERIAL; |
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tty->subtype = SERIAL_TYPE_NORMAL; |
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tty->init_termios = tty_std_termios; |
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tty->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW | |
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TTY_DRIVER_DYNAMIC_DEV; |
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tty_set_operations(tty, &goldfish_tty_ops); |
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ret = tty_register_driver(tty); |
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if (ret) |
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goto err_tty_register_driver_failed; |
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goldfish_tty_driver = tty; |
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return 0; |
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err_tty_register_driver_failed: |
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put_tty_driver(tty); |
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err_alloc_tty_driver_failed: |
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kfree(goldfish_ttys); |
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goldfish_ttys = NULL; |
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err_alloc_goldfish_ttys_failed: |
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return ret; |
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} |
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static void goldfish_tty_delete_driver(void) |
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{ |
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tty_unregister_driver(goldfish_tty_driver); |
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put_tty_driver(goldfish_tty_driver); |
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goldfish_tty_driver = NULL; |
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kfree(goldfish_ttys); |
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goldfish_ttys = NULL; |
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} |
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static int goldfish_tty_probe(struct platform_device *pdev) |
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{ |
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struct goldfish_tty *qtty; |
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int ret = -ENODEV; |
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struct resource *r; |
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struct device *ttydev; |
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void __iomem *base; |
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u32 irq; |
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unsigned int line; |
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!r) { |
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pr_err("goldfish_tty: No MEM resource available!\n"); |
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return -ENOMEM; |
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} |
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base = ioremap(r->start, 0x1000); |
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if (!base) { |
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pr_err("goldfish_tty: Unable to ioremap base!\n"); |
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return -ENOMEM; |
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} |
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r = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
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if (!r) { |
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pr_err("goldfish_tty: No IRQ resource available!\n"); |
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goto err_unmap; |
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} |
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irq = r->start; |
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mutex_lock(&goldfish_tty_lock); |
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if (pdev->id == PLATFORM_DEVID_NONE) |
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line = goldfish_tty_current_line_count; |
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else |
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line = pdev->id; |
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if (line >= goldfish_tty_line_count) { |
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pr_err("goldfish_tty: Reached maximum tty number of %d.\n", |
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goldfish_tty_current_line_count); |
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ret = -ENOMEM; |
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goto err_unlock; |
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} |
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if (goldfish_tty_current_line_count == 0) { |
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ret = goldfish_tty_create_driver(); |
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if (ret) |
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goto err_unlock; |
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} |
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goldfish_tty_current_line_count++; |
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qtty = &goldfish_ttys[line]; |
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spin_lock_init(&qtty->lock); |
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tty_port_init(&qtty->port); |
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qtty->port.ops = &goldfish_port_ops; |
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qtty->base = base; |
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qtty->irq = irq; |
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qtty->dev = &pdev->dev; |
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/* |
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* Goldfish TTY device used by the Goldfish emulator |
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* should identify itself with 0, forcing the driver |
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* to use virtual addresses. Goldfish TTY device |
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* on Ranchu emulator (qemu2) returns 1 here and |
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* driver will use physical addresses. |
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*/ |
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qtty->version = __raw_readl(base + GOLDFISH_TTY_REG_VERSION); |
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/* |
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* Goldfish TTY device on Ranchu emulator (qemu2) |
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* will use DMA for read/write IO operations. |
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*/ |
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if (qtty->version > 0) { |
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/* |
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* Initialize dma_mask to 32-bits. |
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*/ |
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if (!pdev->dev.dma_mask) |
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pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; |
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ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); |
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if (ret) { |
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dev_err(&pdev->dev, "No suitable DMA available.\n"); |
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goto err_dec_line_count; |
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} |
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} |
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__raw_writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_REG_CMD); |
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ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED, |
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"goldfish_tty", qtty); |
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if (ret) { |
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pr_err("goldfish_tty: No IRQ available!\n"); |
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goto err_dec_line_count; |
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} |
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ttydev = tty_port_register_device(&qtty->port, goldfish_tty_driver, |
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line, &pdev->dev); |
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if (IS_ERR(ttydev)) { |
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ret = PTR_ERR(ttydev); |
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goto err_tty_register_device_failed; |
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} |
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strcpy(qtty->console.name, "ttyGF"); |
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qtty->console.write = goldfish_tty_console_write; |
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qtty->console.device = goldfish_tty_console_device; |
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qtty->console.setup = goldfish_tty_console_setup; |
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qtty->console.flags = CON_PRINTBUFFER; |
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qtty->console.index = line; |
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register_console(&qtty->console); |
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platform_set_drvdata(pdev, qtty); |
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mutex_unlock(&goldfish_tty_lock); |
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return 0; |
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err_tty_register_device_failed: |
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free_irq(irq, qtty); |
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err_dec_line_count: |
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goldfish_tty_current_line_count--; |
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if (goldfish_tty_current_line_count == 0) |
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goldfish_tty_delete_driver(); |
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err_unlock: |
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mutex_unlock(&goldfish_tty_lock); |
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err_unmap: |
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iounmap(base); |
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return ret; |
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} |
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static int goldfish_tty_remove(struct platform_device *pdev) |
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{ |
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struct goldfish_tty *qtty = platform_get_drvdata(pdev); |
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mutex_lock(&goldfish_tty_lock); |
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unregister_console(&qtty->console); |
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tty_unregister_device(goldfish_tty_driver, qtty->console.index); |
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iounmap(qtty->base); |
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qtty->base = NULL; |
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free_irq(qtty->irq, pdev); |
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goldfish_tty_current_line_count--; |
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if (goldfish_tty_current_line_count == 0) |
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goldfish_tty_delete_driver(); |
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mutex_unlock(&goldfish_tty_lock); |
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return 0; |
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} |
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#ifdef CONFIG_GOLDFISH_TTY_EARLY_CONSOLE |
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static void gf_early_console_putchar(struct uart_port *port, int ch) |
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{ |
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__raw_writel(ch, port->membase); |
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} |
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static void gf_early_write(struct console *con, const char *s, unsigned int n) |
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{ |
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struct earlycon_device *dev = con->data; |
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uart_console_write(&dev->port, s, n, gf_early_console_putchar); |
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} |
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static int __init gf_earlycon_setup(struct earlycon_device *device, |
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const char *opt) |
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{ |
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if (!device->port.membase) |
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return -ENODEV; |
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device->con->write = gf_early_write; |
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return 0; |
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} |
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OF_EARLYCON_DECLARE(early_gf_tty, "google,goldfish-tty", gf_earlycon_setup); |
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#endif |
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static const struct of_device_id goldfish_tty_of_match[] = { |
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{ .compatible = "google,goldfish-tty", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, goldfish_tty_of_match); |
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static struct platform_driver goldfish_tty_platform_driver = { |
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.probe = goldfish_tty_probe, |
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.remove = goldfish_tty_remove, |
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.driver = { |
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.name = "goldfish_tty", |
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.of_match_table = goldfish_tty_of_match, |
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} |
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}; |
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module_platform_driver(goldfish_tty_platform_driver); |
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MODULE_LICENSE("GPL v2");
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