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u-boot/arch/arm/mach-uniphier/debug-uart/debug-uart.c

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SPDX: Convert all of our single license tags to Linux Kernel style When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-06 21:58:06 +00:00
// SPDX-License-Identifier: GPL-2.0+
ARM: uniphier: support Debug UART For ARM32 architecture, CONFIG_DEBUG_LL is available for early low-level debugging (and actually UniPhier 32bit SoCs use it), but ARM64 architecture does not support it. Instead, CONFIG_DEBUG_UART is available as an architecture-independent debug facility. This commit supports it on all the UniPhier SoCs (including the new ARMv8 SoCs), which is very useful for new SoC bringups. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2016-03-18 07:41:52 +00:00
/*
* Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
*/
#include <common.h>
#include <debug_uart.h>
#include <linux/io.h>
#include <linux/serial_reg.h>
#include "../soc-info.h"
#include "debug-uart.h"
#define UNIPHIER_UART_TX 0x00
#define UNIPHIER_UART_LCR_MCR 0x10
#define UNIPHIER_UART_LSR 0x14
#define UNIPHIER_UART_LDR 0x24
static void _debug_uart_putc(int c)
{
void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
while (!(readl(base + UNIPHIER_UART_LSR) & UART_LSR_THRE))
;
writel(c, base + UNIPHIER_UART_TX);
}
void _debug_uart_init(void)
{
void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
unsigned int divisor;
ARM: uniphier: simplify SoC ID get function Currently, uniphier_get_soc_type() converts the SoC ID (this is read from the revision register) to an enum symbol to use it for SoC identification. Come to think of it, there is no need for the conversion in the first place. Using the SoC ID from the register as-is a straightforward way. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-01-21 09:05:26 +00:00
switch (uniphier_get_soc_id()) {
ARM: uniphier: support Debug UART For ARM32 architecture, CONFIG_DEBUG_LL is available for early low-level debugging (and actually UniPhier 32bit SoCs use it), but ARM64 architecture does not support it. Instead, CONFIG_DEBUG_UART is available as an architecture-independent debug facility. This commit supports it on all the UniPhier SoCs (including the new ARMv8 SoCs), which is very useful for new SoC bringups. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2016-03-18 07:41:52 +00:00
#if defined(CONFIG_ARCH_UNIPHIER_LD4)
ARM: uniphier: simplify SoC ID get function Currently, uniphier_get_soc_type() converts the SoC ID (this is read from the revision register) to an enum symbol to use it for SoC identification. Come to think of it, there is no need for the conversion in the first place. Using the SoC ID from the register as-is a straightforward way. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-01-21 09:05:26 +00:00
case UNIPHIER_LD4_ID:
ARM: uniphier: support Debug UART For ARM32 architecture, CONFIG_DEBUG_LL is available for early low-level debugging (and actually UniPhier 32bit SoCs use it), but ARM64 architecture does not support it. Instead, CONFIG_DEBUG_UART is available as an architecture-independent debug facility. This commit supports it on all the UniPhier SoCs (including the new ARMv8 SoCs), which is very useful for new SoC bringups. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2016-03-18 07:41:52 +00:00
divisor = uniphier_ld4_debug_uart_init();
break;
#endif
#if defined(CONFIG_ARCH_UNIPHIER_PRO4)
ARM: uniphier: simplify SoC ID get function Currently, uniphier_get_soc_type() converts the SoC ID (this is read from the revision register) to an enum symbol to use it for SoC identification. Come to think of it, there is no need for the conversion in the first place. Using the SoC ID from the register as-is a straightforward way. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-01-21 09:05:26 +00:00
case UNIPHIER_PRO4_ID:
ARM: uniphier: support Debug UART For ARM32 architecture, CONFIG_DEBUG_LL is available for early low-level debugging (and actually UniPhier 32bit SoCs use it), but ARM64 architecture does not support it. Instead, CONFIG_DEBUG_UART is available as an architecture-independent debug facility. This commit supports it on all the UniPhier SoCs (including the new ARMv8 SoCs), which is very useful for new SoC bringups. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2016-03-18 07:41:52 +00:00
divisor = uniphier_pro4_debug_uart_init();
break;
#endif
#if defined(CONFIG_ARCH_UNIPHIER_SLD8)
ARM: uniphier: simplify SoC ID get function Currently, uniphier_get_soc_type() converts the SoC ID (this is read from the revision register) to an enum symbol to use it for SoC identification. Come to think of it, there is no need for the conversion in the first place. Using the SoC ID from the register as-is a straightforward way. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-01-21 09:05:26 +00:00
case UNIPHIER_SLD8_ID:
ARM: uniphier: support Debug UART For ARM32 architecture, CONFIG_DEBUG_LL is available for early low-level debugging (and actually UniPhier 32bit SoCs use it), but ARM64 architecture does not support it. Instead, CONFIG_DEBUG_UART is available as an architecture-independent debug facility. This commit supports it on all the UniPhier SoCs (including the new ARMv8 SoCs), which is very useful for new SoC bringups. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2016-03-18 07:41:52 +00:00
divisor = uniphier_sld8_debug_uart_init();
break;
#endif
#if defined(CONFIG_ARCH_UNIPHIER_PRO5)
ARM: uniphier: simplify SoC ID get function Currently, uniphier_get_soc_type() converts the SoC ID (this is read from the revision register) to an enum symbol to use it for SoC identification. Come to think of it, there is no need for the conversion in the first place. Using the SoC ID from the register as-is a straightforward way. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-01-21 09:05:26 +00:00
case UNIPHIER_PRO5_ID:
ARM: uniphier: support Debug UART For ARM32 architecture, CONFIG_DEBUG_LL is available for early low-level debugging (and actually UniPhier 32bit SoCs use it), but ARM64 architecture does not support it. Instead, CONFIG_DEBUG_UART is available as an architecture-independent debug facility. This commit supports it on all the UniPhier SoCs (including the new ARMv8 SoCs), which is very useful for new SoC bringups. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2016-03-18 07:41:52 +00:00
divisor = uniphier_pro5_debug_uart_init();
break;
#endif
#if defined(CONFIG_ARCH_UNIPHIER_PXS2)
ARM: uniphier: simplify SoC ID get function Currently, uniphier_get_soc_type() converts the SoC ID (this is read from the revision register) to an enum symbol to use it for SoC identification. Come to think of it, there is no need for the conversion in the first place. Using the SoC ID from the register as-is a straightforward way. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-01-21 09:05:26 +00:00
case UNIPHIER_PXS2_ID:
ARM: uniphier: support Debug UART For ARM32 architecture, CONFIG_DEBUG_LL is available for early low-level debugging (and actually UniPhier 32bit SoCs use it), but ARM64 architecture does not support it. Instead, CONFIG_DEBUG_UART is available as an architecture-independent debug facility. This commit supports it on all the UniPhier SoCs (including the new ARMv8 SoCs), which is very useful for new SoC bringups. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2016-03-18 07:41:52 +00:00
divisor = uniphier_pxs2_debug_uart_init();
break;
#endif
#if defined(CONFIG_ARCH_UNIPHIER_LD6B)
ARM: uniphier: simplify SoC ID get function Currently, uniphier_get_soc_type() converts the SoC ID (this is read from the revision register) to an enum symbol to use it for SoC identification. Come to think of it, there is no need for the conversion in the first place. Using the SoC ID from the register as-is a straightforward way. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-01-21 09:05:26 +00:00
case UNIPHIER_LD6B_ID:
ARM: uniphier: support Debug UART For ARM32 architecture, CONFIG_DEBUG_LL is available for early low-level debugging (and actually UniPhier 32bit SoCs use it), but ARM64 architecture does not support it. Instead, CONFIG_DEBUG_UART is available as an architecture-independent debug facility. This commit supports it on all the UniPhier SoCs (including the new ARMv8 SoCs), which is very useful for new SoC bringups. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2016-03-18 07:41:52 +00:00
divisor = uniphier_ld6b_debug_uart_init();
break;
#endif
#if defined(CONFIG_ARCH_UNIPHIER_LD11) || defined(CONFIG_ARCH_UNIPHIER_LD20)
ARM: uniphier: simplify SoC ID get function Currently, uniphier_get_soc_type() converts the SoC ID (this is read from the revision register) to an enum symbol to use it for SoC identification. Come to think of it, there is no need for the conversion in the first place. Using the SoC ID from the register as-is a straightforward way. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-01-21 09:05:26 +00:00
case UNIPHIER_LD11_ID:
case UNIPHIER_LD20_ID:
ARM: uniphier: support Debug UART For ARM32 architecture, CONFIG_DEBUG_LL is available for early low-level debugging (and actually UniPhier 32bit SoCs use it), but ARM64 architecture does not support it. Instead, CONFIG_DEBUG_UART is available as an architecture-independent debug facility. This commit supports it on all the UniPhier SoCs (including the new ARMv8 SoCs), which is very useful for new SoC bringups. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2016-03-18 07:41:52 +00:00
divisor = uniphier_ld20_debug_uart_init();
break;
#endif
default:
return;
}
writel(UART_LCR_WLEN8 << 8, base + UNIPHIER_UART_LCR_MCR);
writel(divisor, base + UNIPHIER_UART_LDR);
}
DEBUG_UART_FUNCS
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