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serial: lpc32xx: allow compile testing

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The lpc32xx_loopback_set() function in hte lpc32xx_hs driver is the
one thing that relies on platform header files. Move that into the
core platform code so we only need a variable declaration for it,
and enable COMPILE_TEST building.

Link: https://lore.kernel.org/r/20190809144043.476786-12-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2019-08-09 16:40:37 +02:00
parent 35974a7cc2
commit ffba29c9eb
3 changed files with 38 additions and 31 deletions
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30
arch/arm/mach-lpc32xx/serial.c
View file

@ -60,6 +60,36 @@ static struct uartinit uartinit_data[] __initdata = {
}, },
}; };
/* LPC3250 Errata HSUART.1: Hang workaround via loopback mode on inactivity */
void lpc32xx_loopback_set(resource_size_t mapbase, int state)
{
int bit;
u32 tmp;
switch (mapbase) {
case LPC32XX_HS_UART1_BASE:
bit = 0;
break;
case LPC32XX_HS_UART2_BASE:
bit = 1;
break;
case LPC32XX_HS_UART7_BASE:
bit = 6;
break;
default:
WARN(1, "lpc32xx_hs: Warning: Unknown port at %08x\n", mapbase);
return;
}
tmp = readl(LPC32XX_UARTCTL_CLOOP);
if (state)
tmp |= (1 << bit);
else
tmp &= ~(1 << bit);
writel(tmp, LPC32XX_UARTCTL_CLOOP);
}
EXPORT_SYMBOL_GPL(lpc32xx_loopback_set);
void __init lpc32xx_serial_init(void) void __init lpc32xx_serial_init(void)
{ {
u32 tmp, clkmodes = 0; u32 tmp, clkmodes = 0;

35
drivers/tty/serial/lpc32xx_hs.c
View file

@ -25,6 +25,8 @@
#include <linux/irq.h> #include <linux/irq.h>
#include <linux/gpio.h> #include <linux/gpio.h>
#include <linux/of.h> #include <linux/of.h>
#include <linux/sizes.h>
#include <linux/soc/nxp/lpc32xx-misc.h>
/* /*
* High Speed UART register offsets * High Speed UART register offsets
@ -79,6 +81,8 @@
#define LPC32XX_HSU_TX_TL8B (0x2 << 0) #define LPC32XX_HSU_TX_TL8B (0x2 << 0)
#define LPC32XX_HSU_TX_TL16B (0x3 << 0) #define LPC32XX_HSU_TX_TL16B (0x3 << 0)
#define LPC32XX_MAIN_OSC_FREQ 13000000
#define MODNAME "lpc32xx_hsuart" #define MODNAME "lpc32xx_hsuart"
struct lpc32xx_hsuart_port { struct lpc32xx_hsuart_port {
@ -149,8 +153,6 @@ static void lpc32xx_hsuart_console_write(struct console *co, const char *s,
local_irq_restore(flags); local_irq_restore(flags);
} }
static void lpc32xx_loopback_set(resource_size_t mapbase, int state);
static int __init lpc32xx_hsuart_console_setup(struct console *co, static int __init lpc32xx_hsuart_console_setup(struct console *co,
char *options) char *options)
{ {
@ -437,35 +439,6 @@ static void serial_lpc32xx_break_ctl(struct uart_port *port,
spin_unlock_irqrestore(&port->lock, flags); spin_unlock_irqrestore(&port->lock, flags);
} }
/* LPC3250 Errata HSUART.1: Hang workaround via loopback mode on inactivity */
static void lpc32xx_loopback_set(resource_size_t mapbase, int state)
{
int bit;
u32 tmp;
switch (mapbase) {
case LPC32XX_HS_UART1_BASE:
bit = 0;
break;
case LPC32XX_HS_UART2_BASE:
bit = 1;
break;
case LPC32XX_HS_UART7_BASE:
bit = 6;
break;
default:
WARN(1, "lpc32xx_hs: Warning: Unknown port at %08x\n", mapbase);
return;
}
tmp = readl(LPC32XX_UARTCTL_CLOOP);
if (state)
tmp |= (1 << bit);
else
tmp &= ~(1 << bit);
writel(tmp, LPC32XX_UARTCTL_CLOOP);
}
/* port->lock is not held. */ /* port->lock is not held. */
static int serial_lpc32xx_startup(struct uart_port *port) static int serial_lpc32xx_startup(struct uart_port *port)
{ {

4
include/linux/soc/nxp/lpc32xx-misc.h
View file

@ -14,6 +14,7 @@
#ifdef CONFIG_ARCH_LPC32XX #ifdef CONFIG_ARCH_LPC32XX
extern u32 lpc32xx_return_iram(void __iomem **mapbase, dma_addr_t *dmaaddr); extern u32 lpc32xx_return_iram(void __iomem **mapbase, dma_addr_t *dmaaddr);
extern void lpc32xx_set_phy_interface_mode(phy_interface_t mode); extern void lpc32xx_set_phy_interface_mode(phy_interface_t mode);
extern void lpc32xx_loopback_set(resource_size_t mapbase, int state);
#else #else
static inline u32 lpc32xx_return_iram(void __iomem **mapbase, dma_addr_t *dmaaddr) static inline u32 lpc32xx_return_iram(void __iomem **mapbase, dma_addr_t *dmaaddr)
{ {
@ -24,6 +25,9 @@ static inline u32 lpc32xx_return_iram(void __iomem **mapbase, dma_addr_t *dmaadd
static inline void lpc32xx_set_phy_interface_mode(phy_interface_t mode) static inline void lpc32xx_set_phy_interface_mode(phy_interface_t mode)
{ {
} }
static inline void lpc32xx_loopback_set(resource_size_t mapbase, int state)
{
}
#endif #endif
#endif /* __SOC_LPC32XX_MISC_H */ #endif /* __SOC_LPC32XX_MISC_H */