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tty: serial: samsung: Remove USI initialization 

USI control is now extracted to the dedicated USI driver. Remove USI
related code from serial driver to avoid conflicts and code duplication.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20211204195757.8600-4-semen.protsenko@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sam Protsenko 2021-12-04 21:57:55 +02:00 committed by Greg Kroah-Hartman
parent 35eaa42c4a
commit 59f37b7370
2 changed files with 4 additions and 41 deletions
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36
drivers/tty/serial/samsung_tty.c
View File

@ -65,7 +65,6 @@ enum s3c24xx_port_type {
struct s3c24xx_uart_info {
char *name;
enum s3c24xx_port_type type;
bool has_usi;
unsigned int port_type;
unsigned int fifosize;
unsigned long rx_fifomask;
@ -1357,28 +1356,6 @@ static int apple_s5l_serial_startup(struct uart_port *port)
return ret;
}
static void exynos_usi_init(struct uart_port *port)
{
struct s3c24xx_uart_port *ourport = to_ourport(port);
struct s3c24xx_uart_info *info = ourport->info;
unsigned int val;
if (!info->has_usi)
return;
/* Clear the software reset of USI block (it's set at startup) */
val = rd_regl(port, USI_CON);
val &= ~USI_CON_RESET_MASK;
wr_regl(port, USI_CON, val);
udelay(1);
/* Continuously provide the clock to USI IP w/o gating (for Rx mode) */
val = rd_regl(port, USI_OPTION);
val &= ~USI_OPTION_HWACG_MASK;
val |= USI_OPTION_HWACG_CLKREQ_ON;
wr_regl(port, USI_OPTION, val);
}
/* power power management control */
static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
@ -1405,8 +1382,6 @@ static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
if (!IS_ERR(ourport->baudclk))
clk_prepare_enable(ourport->baudclk);
exynos_usi_init(port);
break;
default:
dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level);
@ -2130,8 +2105,6 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
if (ret)
pr_warn("uart: failed to enable baudclk\n");
exynos_usi_init(port);
/* Keep all interrupts masked and cleared */
switch (ourport->info->type) {
case TYPE_S3C6400:
@ -2780,11 +2753,10 @@ static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
#endif
#if defined(CONFIG_ARCH_EXYNOS)
#define EXYNOS_COMMON_SERIAL_DRV_DATA(_has_usi) \
#define EXYNOS_COMMON_SERIAL_DRV_DATA() \
.info = &(struct s3c24xx_uart_info) { \
.name = "Samsung Exynos UART", \
.type = TYPE_S3C6400, \
.has_usi = _has_usi, \
.port_type = PORT_S3C6400, \
.has_divslot = 1, \
.rx_fifomask = S5PV210_UFSTAT_RXMASK, \
@ -2805,17 +2777,17 @@ static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
} \
static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
EXYNOS_COMMON_SERIAL_DRV_DATA(false),
EXYNOS_COMMON_SERIAL_DRV_DATA(),
.fifosize = { 256, 64, 16, 16 },
};
static struct s3c24xx_serial_drv_data exynos5433_serial_drv_data = {
EXYNOS_COMMON_SERIAL_DRV_DATA(false),
EXYNOS_COMMON_SERIAL_DRV_DATA(),
.fifosize = { 64, 256, 16, 256 },
};
static struct s3c24xx_serial_drv_data exynos850_serial_drv_data = {
EXYNOS_COMMON_SERIAL_DRV_DATA(true),
EXYNOS_COMMON_SERIAL_DRV_DATA(),
.fifosize = { 256, 64, 64, 64 },
};

9
include/linux/serial_s3c.h
View File

@ -27,15 +27,6 @@
#define S3C2410_UERSTAT (0x14)
#define S3C2410_UFSTAT (0x18)
#define S3C2410_UMSTAT (0x1C)
#define USI_CON (0xC4)
#define USI_OPTION (0xC8)
#define USI_CON_RESET (1<<0)
#define USI_CON_RESET_MASK (1<<0)
#define USI_OPTION_HWACG_CLKREQ_ON (1<<1)
#define USI_OPTION_HWACG_CLKSTOP_ON (1<<2)
#define USI_OPTION_HWACG_MASK (3<<1)
#define S3C2410_LCON_CFGMASK ((0xF<<3)|(0x3))