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serial: apbuart interrupt support

Browse source 
Adds driver support for APBUART transmitter and receiver
interrupts. Compatible with APBUART implementations without HW FIFO
interrupt, for example QEMU.

Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
This commit is contained in:
Martin Åberg 2020-10-28 18:33:18 +01:00 • committed by Andrew Boie
commit ae309f8597
2 changed files with 141 additions and 0 deletions
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1
drivers/serial/Kconfig.apbuart
View file

@ -5,5 +5,6 @@ config UART_APBUART
bool "ABPUART serial driver"
depends on SOC_SPARC_LEON
select SERIAL_HAS_DRIVER
select SERIAL_SUPPORT_INTERRUPT
help
This option enables the APBUART driver for LEON processors.

140
drivers/serial/uart_apbuart.c
View file

@ -128,6 +128,10 @@ struct apbuart_dev_cfg {
struct apbuart_dev_data {
int usefifo;
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
uart_irq_callback_user_data_t cb;
void *cb_data;
#endif
};
#define DEV_CFG(dev) \
@ -299,6 +303,122 @@ static int apbuart_config_get(const struct device *dev, struct uart_config *cfg)
return 0;
}
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
static int apbuart_fifo_fill(const struct device *dev, const uint8_t *tx_data,
int size)
{
volatile struct apbuart_regs *regs = (void *) DEV_CFG(dev)->regs;
int i;
for (i = 0; (i < size) && (regs->status & APBUART_STATUS_TE); i++) {
regs->data = tx_data[i];
}
return i;
}
static int apbuart_fifo_read(const struct device *dev, uint8_t *rx_data,
const int size)
{
volatile struct apbuart_regs *regs = (void *) DEV_CFG(dev)->regs;
int i;
for (i = 0; (i < size) && (regs->status & APBUART_STATUS_DR); i++) {
rx_data[i] = regs->data & 0xff;
}
return i;
}
static void apbuart_irq_tx_enable(const struct device *dev)
{
volatile struct apbuart_regs *regs = (void *) DEV_CFG(dev)->regs;
regs->ctrl |= APBUART_CTRL_TI;
}
static void apbuart_irq_tx_disable(const struct device *dev)
{
volatile struct apbuart_regs *regs = (void *) DEV_CFG(dev)->regs;
regs->ctrl &= ~APBUART_CTRL_TI;
}
static int apbuart_irq_tx_ready(const struct device *dev)
{
volatile struct apbuart_regs *regs = (void *) DEV_CFG(dev)->regs;
return !!(regs->status & APBUART_STATUS_TE);
}
static int apbuart_irq_tx_complete(const struct device *dev)
{
volatile struct apbuart_regs *regs = (void *) DEV_CFG(dev)->regs;
return !!(regs->status & APBUART_STATUS_TS);
}
static void apbuart_irq_rx_enable(const struct device *dev)
{
volatile struct apbuart_regs *regs = (void *) DEV_CFG(dev)->regs;
regs->ctrl |= APBUART_CTRL_RI;
}
static void apbuart_irq_rx_disable(const struct device *dev)
{
volatile struct apbuart_regs *regs = (void *) DEV_CFG(dev)->regs;
regs->ctrl &= ~APBUART_CTRL_RI;
}
static int apbuart_irq_rx_ready(const struct device *dev)
{
volatile struct apbuart_regs *regs = (void *) DEV_CFG(dev)->regs;
return !!(regs->status & APBUART_STATUS_DR);
}
static int apbuart_irq_is_pending(const struct device *dev)
{
volatile struct apbuart_regs *regs = (void *) DEV_CFG(dev)->regs;
uint32_t status = regs->status;
uint32_t ctrl = regs->ctrl;
if ((ctrl & APBUART_CTRL_RI) && (status & APBUART_STATUS_DR)) {
return 1;
}
if ((ctrl & APBUART_CTRL_TI) && (status & APBUART_STATUS_TE)) {
return 1;
}
return 0;
}
static int apbuart_irq_update(const struct device *dev)
{
return 1;
}
static void apbuart_irq_callback_set(const struct device *dev,
uart_irq_callback_user_data_t cb,
void *cb_data)
{
struct apbuart_dev_data *const dev_data = DEV_DATA(dev);
dev_data->cb = cb;
dev_data->cb_data = cb_data;
}
static void apbuart_isr(const struct device *dev)
{
struct apbuart_dev_data *const dev_data = DEV_DATA(dev);
if (dev_data->cb) {
dev_data->cb(dev, dev_data->cb_data);
}
}
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
static int apbuart_init(const struct device *dev)
{
volatile struct apbuart_regs *regs = (void *) DEV_CFG(dev)->regs;
@ -319,6 +439,12 @@ static int apbuart_init(const struct device *dev)
regs->status = 0;
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
irq_connect_dynamic(DEV_CFG(dev)->interrupt,
0, (void (*)(const void *))apbuart_isr, dev, 0);
irq_enable(DEV_CFG(dev)->interrupt);
#endif
return 0;
}
@ -329,6 +455,20 @@ static const struct uart_driver_api apbuart_driver_api = {
.err_check = apbuart_err_check,
.configure = apbuart_configure,
.config_get = apbuart_config_get,
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
.fifo_fill = apbuart_fifo_fill,
.fifo_read = apbuart_fifo_read,
.irq_tx_enable = apbuart_irq_tx_enable,
.irq_tx_disable = apbuart_irq_tx_disable,
.irq_tx_ready = apbuart_irq_tx_ready,
.irq_rx_enable = apbuart_irq_rx_enable,
.irq_rx_disable = apbuart_irq_rx_disable,
.irq_tx_complete = apbuart_irq_tx_complete,
.irq_rx_ready = apbuart_irq_rx_ready,
.irq_is_pending = apbuart_irq_is_pending,
.irq_update = apbuart_irq_update,
.irq_callback_set = apbuart_irq_callback_set,
#endif
};
#define APBUART_INIT(index) \