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#include <linux/spinlock.h>
#include "mantis_common.h"
struct mantis_uart_params {
enum mantis_baud baud_rate;
enum mantis_parity parity;
};
#define UART_MAX_BUF 16
int mantis_uart_read(struct mantis_pci *mantis, u8 *data)
{
struct mantis_hwconfig *config = mantis->hwconfig;
u32 stat, i;
unsigned long flags;
/* get data */
for (i = 0; i < (config->bytes + 1); i++) {
if (stat & MANTIS_UART_RXFIFO_FULL) {
dprintk(verbose, MANTIS_ERROR, 1, "RX Fifo FULL");
}
data[i] = mmread(MANTIS_UART_RXD) & 0x3f;
stat = mmread(MANTIS_UART_STAT);
dprintk(verbose, MANTIS_DEBUG, 1, "Reading ... <%02x>", data[i] & 0x3f);
if (data[i] & (1 << 7)) {
dprintk(verbose, MANTIS_ERROR, 1, "UART framing error");
return -EINVAL;
}
if (data[i] & (1 << 6)) {
dprintk(verbose, MANTIS_ERROR, 1, "UART parity error");
return -EINVAL;
}
}
return 0;
}
static void mantis_uart_work(struct work_struct *work)
{
struct mantis_pci *mantis = container_of(work, struct mantis_pci, uart_work);
struct mantis_hwconfig *config = mantis->hwconfig;
u8 buf[16];
int i;
dprintk(verbose, MANTIS_DEBUG, 1, "UART read");
mantis_uart_read(mantis, buf);
dprintk(verbose, MANTIS_DEBUG, 1, "UART: ");
for (i = 0; i < (config->bytes + 1); i++)
dprintk(verbose, MANTIS_DEBUG, 0, "<%02x> ", buf[i]);
dprintk(verbose, MANTIS_DEBUG, 0, "\n");
}
static int mantis_uart_setup(struct mantis_pci *mantis,
struct mantis_uart_params *params)
{
char* rates[] = { "B_9600", "B_19200", "B_38400", "B_57600", "B_115200" };
char* parity[] = { "NONE", "ODD", "EVEN" };
u32 reg;
dprintk(verbose, MANTIS_DEBUG, 1, "Set Parity <%s> Baud Rate <%s>",
parity[params->parity],
rates[params->baud_rate]);
mmwrite((mmread(MANTIS_UART_CTL) | (params->parity & 0x3)), MANTIS_UART_CTL);
reg = mmread(MANTIS_UART_BAUD);
switch (params->baud_rate) {
case MANTIS_BAUD_9600:
reg |= 0xd8;
break;
case MANTIS_BAUD_19200:
reg |= 0x6c;
break;
case MANTIS_BAUD_38400:
reg |= 0x36;
break;
case MANTIS_BAUD_57600:
reg |= 0x23;
break;
case MANTIS_BAUD_115200:
reg |= 0x11;
break;
default:
return -EINVAL;
}
mmwrite(reg, MANTIS_UART_BAUD);
return 0;
}
int mantis_uart_init(struct mantis_pci *mantis)
{
struct mantis_hwconfig *config = mantis->hwconfig;
struct mantis_uart_params params;
dprintk(verbose, MANTIS_DEBUG, 1, "Initializing UART ..");
/* default parity: */
params.baud_rate = config->baud_rate;
params.parity = config->parity;
init_waitqueue_head(&mantis->uart_wq);
spin_lock_init(&mantis->uart_lock);
INIT_WORK(&mantis->uart_work, mantis_uart_work);
/* disable interrupt */
mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
mantis_uart_setup(mantis, ¶ms);
/* default 1 byte */
mmwrite((mmread(MANTIS_UART_BAUD) | (config->bytes << 8)), MANTIS_UART_BAUD);
/* flush buffer */
mmwrite((mmread(MANTIS_UART_CTL) | MANTIS_UART_RXFLUSH), MANTIS_UART_CTL);
/* enable interrupt */
mmwrite(mmread(MANTIS_INT_MASK) | 0x800, MANTIS_INT_MASK);
mmwrite(mmread(MANTIS_UART_CTL) | MANTIS_UART_RXINT, MANTIS_UART_CTL);
schedule_work(&mantis->uart_work);
return 0;
}
void mantis_uart_exit(struct mantis_pci *mantis)
{
/* disable interrupt */
mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
}
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