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Message-Id: <1346413645-4593-1-git-send-email-castet.matthieu@free.fr>
Date: Fri, 31 Aug 2012 13:47:25 +0200
From: Matthieu CASTET <castet.matthieu@...e.fr>
To: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
gregkh@...uxfoundation.org
Cc: sboyd@...eaurora.org, arnd@...db.de, alan@...rguk.ukuu.org.uk,
Matthieu CASTET <castet.matthieu@...e.fr>,
Matthieu Castet <matthieu.castet@...rot.com>
Subject: [PATCH v2] hvc_dcc : add support to armv4 and armv5 core
Signed-off-by: Matthieu Castet <matthieu.castet@...rot.com>
---
drivers/tty/hvc/hvc_dcc.c | 83 +++++++++++++++++++++++++++++++++++++++++----
1 file changed, 76 insertions(+), 7 deletions(-)
diff --git a/drivers/tty/hvc/hvc_dcc.c b/drivers/tty/hvc/hvc_dcc.c
index 44fbeba..5f8827f 100644
--- a/drivers/tty/hvc/hvc_dcc.c
+++ b/drivers/tty/hvc/hvc_dcc.c
@@ -27,10 +27,10 @@
#include "hvc_console.h"
/* DCC Status Bits */
-#define DCC_STATUS_RX (1 << 30)
-#define DCC_STATUS_TX (1 << 29)
+#define DCC_STATUS_RX_V6 (1 << 30)
+#define DCC_STATUS_TX_V6 (1 << 29)
-static inline u32 __dcc_getstatus(void)
+static inline u32 __dcc_getstatus_v6(void)
{
u32 __ret;
asm volatile("mrc p14, 0, %0, c0, c1, 0 @ read comms ctrl reg"
@@ -40,7 +40,7 @@ static inline u32 __dcc_getstatus(void)
}
-static inline char __dcc_getchar(void)
+static inline char __dcc_getchar_v6(void)
{
char __c;
@@ -51,7 +51,7 @@ static inline char __dcc_getchar(void)
return __c;
}
-static inline void __dcc_putchar(char c)
+static inline void __dcc_putchar_v6(char c)
{
asm volatile("mcr p14, 0, %0, c0, c5, 0 @ write a char"
: /* no output register */
@@ -59,6 +59,69 @@ static inline void __dcc_putchar(char c)
isb();
}
+static int hvc_dcc_put_chars_v6(uint32_t vt, const char *buf, int count)
+{
+ int i;
+
+ for (i = 0; i < count; i++) {
+ while (__dcc_getstatus_v6() & DCC_STATUS_TX_V6)
+ cpu_relax();
+
+ __dcc_putchar_v6(buf[i]);
+ }
+
+ return count;
+}
+
+static int hvc_dcc_get_chars_v6(uint32_t vt, char *buf, int count)
+{
+ int i;
+
+ for (i = 0; i < count; ++i)
+ if (__dcc_getstatus_v6() & DCC_STATUS_RX_V6)
+ buf[i] = __dcc_getchar_v6();
+ else
+ break;
+
+ return i;
+}
+
+static const struct hv_ops hvc_dcc_get_put_ops_v6 = {
+ .get_chars = hvc_dcc_get_chars_v6,
+ .put_chars = hvc_dcc_put_chars_v6,
+};
+
+#define DCC_STATUS_RX (1 << 0)
+#define DCC_STATUS_TX (1 << 1)
+
+/* primitive JTAG1 protocol utilities */
+static inline u32 __dcc_getstatus(void)
+{
+ u32 ret;
+
+ asm __volatile__ ("mrc p14, 0, %0, c0, c0 @ read comms ctrl reg"
+ : "=r" (ret));
+
+ return ret;
+}
+
+static inline char __dcc_getchar(void)
+{
+ char c;
+
+ asm __volatile__ ("mrc p14, 0, %0, c1, c0 @ read comms data reg"
+ : "=r" (c));
+
+ return c;
+}
+
+static inline void __dcc_putchar(unsigned char c)
+{
+ asm __volatile__ ("mcr p14, 0, %0, c1, c0 @ write a char"
+ : /* no output register */
+ : "r" (c));
+}
+
static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count)
{
int i;
@@ -93,14 +156,20 @@ static const struct hv_ops hvc_dcc_get_put_ops = {
static int __init hvc_dcc_console_init(void)
{
- hvc_instantiate(0, 0, &hvc_dcc_get_put_ops);
+ if (cpu_architecture() >= CPU_ARCH_ARMv6)
+ hvc_instantiate(0, 0, &hvc_dcc_get_put_ops_v6);
+ else
+ hvc_instantiate(0, 0, &hvc_dcc_get_put_ops);
return 0;
}
console_initcall(hvc_dcc_console_init);
static int __init hvc_dcc_init(void)
{
- hvc_alloc(0, 0, &hvc_dcc_get_put_ops, 128);
+ if (cpu_architecture() >= CPU_ARCH_ARMv6)
+ hvc_alloc(0, 0, &hvc_dcc_get_put_ops_v6, 128);
+ else
+ hvc_alloc(0, 0, &hvc_dcc_get_put_ops, 128);
return 0;
}
device_initcall(hvc_dcc_init);
--
1.7.10.4
--
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