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tty: goldfish: Refactor constants to better reflect their nature 

Classify constants GOLDFISH_TTY_xxx into two groups: command ids and
register offsets. Apply different naming for register offsets (add
'REG_' after 'GOLDFISH_TTY_' in constant names). Change implementation
to use preprocessor's '#define' statements instead of 'enum'
declaration (as this is more common way of implementation in such
cases).

This makes the driver code easier to follow and hopefully prevents
future bugs.

Signed-off-by: Miodrag Dinic <miodrag.dinic@imgtec.com>
Signed-off-by: Goran Ferenc <goran.ferenc@imgtec.com>
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aleksandar Markovic 2017-08-29 15:53:18 +02:00 committed by Greg Kroah-Hartman
parent ae28d7402a
commit 2296eee704
1 changed files with 24 additions and 26 deletions
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50
drivers/tty/goldfish.c
View File

@ -23,20 +23,18 @@
#include <linux/module.h>
#include <linux/goldfish.h>
enum {
GOLDFISH_TTY_PUT_CHAR = 0x00,
GOLDFISH_TTY_BYTES_READY = 0x04,
GOLDFISH_TTY_CMD = 0x08,
/* Goldfish tty register's offsets */
#define GOLDFISH_TTY_REG_BYTES_READY 0x04
#define GOLDFISH_TTY_REG_CMD 0x08
#define GOLDFISH_TTY_REG_DATA_PTR 0x10
#define GOLDFISH_TTY_REG_DATA_LEN 0x14
#define GOLDFISH_TTY_REG_DATA_PTR_HIGH 0x18
GOLDFISH_TTY_DATA_PTR = 0x10,
GOLDFISH_TTY_DATA_LEN = 0x14,
GOLDFISH_TTY_DATA_PTR_HIGH = 0x18,
GOLDFISH_TTY_CMD_INT_DISABLE = 0,
GOLDFISH_TTY_CMD_INT_ENABLE = 1,
GOLDFISH_TTY_CMD_WRITE_BUFFER = 2,
GOLDFISH_TTY_CMD_READ_BUFFER = 3,
};
/* Goldfish tty commands */
#define GOLDFISH_TTY_CMD_INT_DISABLE 0
#define GOLDFISH_TTY_CMD_INT_ENABLE 1
#define GOLDFISH_TTY_CMD_WRITE_BUFFER 2
#define GOLDFISH_TTY_CMD_READ_BUFFER 3
struct goldfish_tty {
struct tty_port port;
@ -59,10 +57,10 @@ static void goldfish_tty_do_write(int line, const char *buf, unsigned count)
struct goldfish_tty *qtty = &goldfish_ttys[line];
void __iomem *base = qtty->base;
spin_lock_irqsave(&qtty->lock, irq_flags);
gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR,
base + GOLDFISH_TTY_DATA_PTR_HIGH);
writel(count, base + GOLDFISH_TTY_DATA_LEN);
writel(GOLDFISH_TTY_CMD_WRITE_BUFFER, base + GOLDFISH_TTY_CMD);
gf_write_ptr(buf, base + GOLDFISH_TTY_REG_DATA_PTR,
base + GOLDFISH_TTY_REG_DATA_PTR_HIGH);
writel(count, base + GOLDFISH_TTY_REG_DATA_LEN);
writel(GOLDFISH_TTY_CMD_WRITE_BUFFER, base + GOLDFISH_TTY_REG_CMD);
spin_unlock_irqrestore(&qtty->lock, irq_flags);
}
@ -74,16 +72,16 @@ static irqreturn_t goldfish_tty_interrupt(int irq, void *dev_id)
unsigned char *buf;
u32 count;
count = readl(base + GOLDFISH_TTY_BYTES_READY);
count = readl(base + GOLDFISH_TTY_REG_BYTES_READY);
if (count == 0)
return IRQ_NONE;
count = tty_prepare_flip_string(&qtty->port, &buf, count);
spin_lock_irqsave(&qtty->lock, irq_flags);
gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR,
base + GOLDFISH_TTY_DATA_PTR_HIGH);
writel(count, base + GOLDFISH_TTY_DATA_LEN);
writel(GOLDFISH_TTY_CMD_READ_BUFFER, base + GOLDFISH_TTY_CMD);
gf_write_ptr(buf, base + GOLDFISH_TTY_REG_DATA_PTR,
base + GOLDFISH_TTY_REG_DATA_PTR_HIGH);
writel(count, base + GOLDFISH_TTY_REG_DATA_LEN);
writel(GOLDFISH_TTY_CMD_READ_BUFFER, base + GOLDFISH_TTY_REG_CMD);
spin_unlock_irqrestore(&qtty->lock, irq_flags);
tty_schedule_flip(&qtty->port);
return IRQ_HANDLED;
@ -93,7 +91,7 @@ static int goldfish_tty_activate(struct tty_port *port, struct tty_struct *tty)
{
struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
port);
writel(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_CMD);
writel(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_REG_CMD);
return 0;
}
@ -101,7 +99,7 @@ static void goldfish_tty_shutdown(struct tty_port *port)
{
struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
port);
writel(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_CMD);
writel(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_REG_CMD);
}
static int goldfish_tty_open(struct tty_struct *tty, struct file *filp)
@ -136,7 +134,7 @@ static int goldfish_tty_chars_in_buffer(struct tty_struct *tty)
{
struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
void __iomem *base = qtty->base;
return readl(base + GOLDFISH_TTY_BYTES_READY);
return readl(base + GOLDFISH_TTY_REG_BYTES_READY);
}
static void goldfish_tty_console_write(struct console *co, const char *b,
@ -272,7 +270,7 @@ static int goldfish_tty_probe(struct platform_device *pdev)
qtty->base = base;
qtty->irq = irq;
writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_CMD);
writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_REG_CMD);
ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED,
"goldfish_tty", qtty);