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Message-Id: <20240511104341.151550-15-aleksandar.rikalo@syrmia.com>
Date: Sat, 11 May 2024 12:43:41 +0200
From: Aleksandar Rikalo <aleksandar.rikalo@...mia.com>
To: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: Aleksandar Rikalo <arikalo@...il.com>,
Chao-ying Fu <cfu@...ecomp.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Greg Ungerer <gerg@...nel.org>,
Hauke Mehrtens <hauke@...ke-m.de>,
Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>,
Jiaxun Yang <jiaxun.yang@...goat.com>,
linux-kernel@...r.kernel.org,
linux-mips@...r.kernel.org,
Marc Zyngier <maz@...nel.org>,
Paul Burton <paulburton@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Serge Semin <fancer.lancer@...il.com>,
Thomas Gleixner <tglx@...utronix.de>,
Tiezhu Yang <yangtiezhu@...ngson.cn>
Subject: [PATCH v4 14/14] mips: FDC driver refactor
Separate the FDC driver code into two parts, common and
mips-specific.
No functional impact.
Signed-off-by: Aleksandar Rikalo <aleksandar.rikalo@...mia.com>
Signed-off-by: Djordje Todorovic <djordje.todorovic@...mia.com>
---
drivers/tty/mips_fdc/Makefile | 2 +
drivers/tty/mips_fdc/ejtag-fdc-mips.c | 29 ++++++++++++
drivers/tty/mips_fdc/ejtag-fdc.c | 66 +++------------------------
drivers/tty/mips_fdc/ejtag-fdc.h | 55 ++++++++++++++++++++++
4 files changed, 93 insertions(+), 59 deletions(-)
create mode 100644 drivers/tty/mips_fdc/ejtag-fdc-mips.c
create mode 100644 drivers/tty/mips_fdc/ejtag-fdc.h
diff --git a/drivers/tty/mips_fdc/Makefile b/drivers/tty/mips_fdc/Makefile
index 03b2781e1090..9e0894a8b342 100644
--- a/drivers/tty/mips_fdc/Makefile
+++ b/drivers/tty/mips_fdc/Makefile
@@ -1,2 +1,4 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_MIPS_EJTAG_FDC_TTY) += ejtag-fdc.o
+
+obj-$(CONFIG_MIPS) += ejtag-fdc-mips.o
diff --git a/drivers/tty/mips_fdc/ejtag-fdc-mips.c b/drivers/tty/mips_fdc/ejtag-fdc-mips.c
new file mode 100644
index 000000000000..3942ee818f0b
--- /dev/null
+++ b/drivers/tty/mips_fdc/ejtag-fdc-mips.c
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "ejtag-fdc.h"
+
+void __iomem *get_fdc_regs(void)
+{
+ return mips_cdmm_early_probe(0xfd);
+}
+
+int is_fdc_interrupt(void)
+{
+ return read_c0_cause() & CAUSEF_FDCI;
+}
+
+static const struct mips_cdmm_device_id mips_ejtag_fdc_tty_ids[] = {
+ { .type = 0xfd },
+ { }
+};
+
+static struct mips_cdmm_driver mips_ejtag_fdc_tty_driver = {
+ .drv = {
+ .name = "mips_ejtag_fdc",
+ },
+ .probe = mips_ejtag_fdc_tty_probe,
+ .cpu_down = mips_ejtag_fdc_tty_cpu_down,
+ .cpu_up = mips_ejtag_fdc_tty_cpu_up,
+ .id_table = mips_ejtag_fdc_tty_ids,
+};
+builtin_mips_cdmm_driver(mips_ejtag_fdc_tty_driver);
diff --git a/drivers/tty/mips_fdc/ejtag-fdc.c b/drivers/tty/mips_fdc/ejtag-fdc.c
index afbf7738c7c4..fecd96118019 100644
--- a/drivers/tty/mips_fdc/ejtag-fdc.c
+++ b/drivers/tty/mips_fdc/ejtag-fdc.c
@@ -28,45 +28,9 @@
#include <linux/tty_flip.h>
#include <linux/uaccess.h>
-#include <asm/cdmm.h>
#include <asm/irq.h>
-/* Register offsets */
-#define REG_FDACSR 0x00 /* FDC Access Control and Status Register */
-#define REG_FDCFG 0x08 /* FDC Configuration Register */
-#define REG_FDSTAT 0x10 /* FDC Status Register */
-#define REG_FDRX 0x18 /* FDC Receive Register */
-#define REG_FDTX(N) (0x20+0x8*(N)) /* FDC Transmit Register n (0..15) */
-
-/* Register fields */
-
-#define REG_FDCFG_TXINTTHRES_SHIFT 18
-#define REG_FDCFG_TXINTTHRES (0x3 << REG_FDCFG_TXINTTHRES_SHIFT)
-#define REG_FDCFG_TXINTTHRES_DISABLED (0x0 << REG_FDCFG_TXINTTHRES_SHIFT)
-#define REG_FDCFG_TXINTTHRES_EMPTY (0x1 << REG_FDCFG_TXINTTHRES_SHIFT)
-#define REG_FDCFG_TXINTTHRES_NOTFULL (0x2 << REG_FDCFG_TXINTTHRES_SHIFT)
-#define REG_FDCFG_TXINTTHRES_NEAREMPTY (0x3 << REG_FDCFG_TXINTTHRES_SHIFT)
-#define REG_FDCFG_RXINTTHRES_SHIFT 16
-#define REG_FDCFG_RXINTTHRES (0x3 << REG_FDCFG_RXINTTHRES_SHIFT)
-#define REG_FDCFG_RXINTTHRES_DISABLED (0x0 << REG_FDCFG_RXINTTHRES_SHIFT)
-#define REG_FDCFG_RXINTTHRES_FULL (0x1 << REG_FDCFG_RXINTTHRES_SHIFT)
-#define REG_FDCFG_RXINTTHRES_NOTEMPTY (0x2 << REG_FDCFG_RXINTTHRES_SHIFT)
-#define REG_FDCFG_RXINTTHRES_NEARFULL (0x3 << REG_FDCFG_RXINTTHRES_SHIFT)
-#define REG_FDCFG_TXFIFOSIZE_SHIFT 8
-#define REG_FDCFG_TXFIFOSIZE (0xff << REG_FDCFG_TXFIFOSIZE_SHIFT)
-#define REG_FDCFG_RXFIFOSIZE_SHIFT 0
-#define REG_FDCFG_RXFIFOSIZE (0xff << REG_FDCFG_RXFIFOSIZE_SHIFT)
-
-#define REG_FDSTAT_TXCOUNT_SHIFT 24
-#define REG_FDSTAT_TXCOUNT (0xff << REG_FDSTAT_TXCOUNT_SHIFT)
-#define REG_FDSTAT_RXCOUNT_SHIFT 16
-#define REG_FDSTAT_RXCOUNT (0xff << REG_FDSTAT_RXCOUNT_SHIFT)
-#define REG_FDSTAT_RXCHAN_SHIFT 4
-#define REG_FDSTAT_RXCHAN (0xf << REG_FDSTAT_RXCHAN_SHIFT)
-#define REG_FDSTAT_RXE BIT(3) /* Rx Empty */
-#define REG_FDSTAT_RXF BIT(2) /* Rx Full */
-#define REG_FDSTAT_TXE BIT(1) /* Tx Empty */
-#define REG_FDSTAT_TXF BIT(0) /* Tx Full */
+#include "ejtag-fdc.h"
/* Default channel for the early console */
#define CONSOLE_CHANNEL 1
@@ -375,7 +339,7 @@ static int __init mips_ejtag_fdc_console_init(struct mips_ejtag_fdc_console *c)
if (c->initialised)
goto out;
/* Look for the FDC device */
- regs = mips_cdmm_early_probe(0xfd);
+ regs = get_fdc_regs();
if (IS_ERR(regs)) {
ret = PTR_ERR(regs);
goto out;
@@ -664,7 +628,7 @@ static irqreturn_t mips_ejtag_fdc_isr(int irq, void *dev_id)
return IRQ_NONE;
/* If no FDC interrupt pending, it wasn't for us */
- if (!(read_c0_cause() & CAUSEF_FDCI))
+ if (!is_fdc_interrupt())
return IRQ_NONE;
mips_ejtag_fdc_handle(priv);
@@ -882,7 +846,7 @@ int __weak get_c0_fdc_int(void)
return -1;
}
-static int mips_ejtag_fdc_tty_probe(struct mips_cdmm_device *dev)
+int mips_ejtag_fdc_tty_probe(struct mips_cdmm_device *dev)
{
int ret, nport;
struct mips_ejtag_fdc_tty_port *dport;
@@ -1045,7 +1009,7 @@ static int mips_ejtag_fdc_tty_probe(struct mips_cdmm_device *dev)
return ret;
}
-static int mips_ejtag_fdc_tty_cpu_down(struct mips_cdmm_device *dev)
+int mips_ejtag_fdc_tty_cpu_down(struct mips_cdmm_device *dev)
{
struct mips_ejtag_fdc_tty *priv = mips_cdmm_get_drvdata(dev);
unsigned int cfg;
@@ -1068,7 +1032,7 @@ static int mips_ejtag_fdc_tty_cpu_down(struct mips_cdmm_device *dev)
return 0;
}
-static int mips_ejtag_fdc_tty_cpu_up(struct mips_cdmm_device *dev)
+int mips_ejtag_fdc_tty_cpu_up(struct mips_cdmm_device *dev)
{
struct mips_ejtag_fdc_tty *priv = mips_cdmm_get_drvdata(dev);
unsigned int cfg;
@@ -1106,22 +1070,6 @@ static int mips_ejtag_fdc_tty_cpu_up(struct mips_cdmm_device *dev)
return ret;
}
-static const struct mips_cdmm_device_id mips_ejtag_fdc_tty_ids[] = {
- { .type = 0xfd },
- { }
-};
-
-static struct mips_cdmm_driver mips_ejtag_fdc_tty_driver = {
- .drv = {
- .name = "mips_ejtag_fdc",
- },
- .probe = mips_ejtag_fdc_tty_probe,
- .cpu_down = mips_ejtag_fdc_tty_cpu_down,
- .cpu_up = mips_ejtag_fdc_tty_cpu_up,
- .id_table = mips_ejtag_fdc_tty_ids,
-};
-builtin_mips_cdmm_driver(mips_ejtag_fdc_tty_driver);
-
static int __init mips_ejtag_fdc_init_console(void)
{
return mips_ejtag_fdc_console_init(&mips_ejtag_fdc_con);
@@ -1166,7 +1114,7 @@ static void __iomem *kgdbfdc_setup(void)
regs = mips_ejtag_fdc_con.regs[cpu];
/* First console output on this CPU? */
if (!regs) {
- regs = mips_cdmm_early_probe(0xfd);
+ regs = get_fdc_regs();
mips_ejtag_fdc_con.regs[cpu] = regs;
}
/* Already tried and failed to find FDC on this CPU? */
diff --git a/drivers/tty/mips_fdc/ejtag-fdc.h b/drivers/tty/mips_fdc/ejtag-fdc.h
new file mode 100644
index 000000000000..62e8fbe1b614
--- /dev/null
+++ b/drivers/tty/mips_fdc/ejtag-fdc.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * TTY driver for MIPS EJTAG Fast Debug Channels.
+ *
+ * Copyright (C) 2007-2015 Imagination Technologies Ltd
+ */
+
+#ifndef __EJTAG_FDC_H
+#define __EJTAG_FDC_H
+
+#include <asm/cdmm.h>
+
+/* Register offsets */
+#define REG_FDACSR 0x00 /* FDC Access Control and Status Register */
+#define REG_FDCFG 0x08 /* FDC Configuration Register */
+#define REG_FDSTAT 0x10 /* FDC Status Register */
+#define REG_FDRX 0x18 /* FDC Receive Register */
+#define REG_FDTX(N) (0x20+0x8*(N)) /* FDC Transmit Register n (0..15) */
+
+/* Register fields */
+#define REG_FDCFG_TXINTTHRES_SHIFT 18
+#define REG_FDCFG_TXINTTHRES (0x3 << REG_FDCFG_TXINTTHRES_SHIFT)
+#define REG_FDCFG_TXINTTHRES_DISABLED (0x0 << REG_FDCFG_TXINTTHRES_SHIFT)
+#define REG_FDCFG_TXINTTHRES_EMPTY (0x1 << REG_FDCFG_TXINTTHRES_SHIFT)
+#define REG_FDCFG_TXINTTHRES_NOTFULL (0x2 << REG_FDCFG_TXINTTHRES_SHIFT)
+#define REG_FDCFG_TXINTTHRES_NEAREMPTY (0x3 << REG_FDCFG_TXINTTHRES_SHIFT)
+#define REG_FDCFG_RXINTTHRES_SHIFT 16
+#define REG_FDCFG_RXINTTHRES (0x3 << REG_FDCFG_RXINTTHRES_SHIFT)
+#define REG_FDCFG_RXINTTHRES_DISABLED (0x0 << REG_FDCFG_RXINTTHRES_SHIFT)
+#define REG_FDCFG_RXINTTHRES_FULL (0x1 << REG_FDCFG_RXINTTHRES_SHIFT)
+#define REG_FDCFG_RXINTTHRES_NOTEMPTY (0x2 << REG_FDCFG_RXINTTHRES_SHIFT)
+#define REG_FDCFG_RXINTTHRES_NEARFULL (0x3 << REG_FDCFG_RXINTTHRES_SHIFT)
+#define REG_FDCFG_TXFIFOSIZE_SHIFT 8
+#define REG_FDCFG_TXFIFOSIZE (0xff << REG_FDCFG_TXFIFOSIZE_SHIFT)
+#define REG_FDCFG_RXFIFOSIZE_SHIFT 0
+#define REG_FDCFG_RXFIFOSIZE (0xff << REG_FDCFG_RXFIFOSIZE_SHIFT)
+
+#define REG_FDSTAT_TXCOUNT_SHIFT 24
+#define REG_FDSTAT_TXCOUNT (0xff << REG_FDSTAT_TXCOUNT_SHIFT)
+#define REG_FDSTAT_RXCOUNT_SHIFT 16
+#define REG_FDSTAT_RXCOUNT (0xff << REG_FDSTAT_RXCOUNT_SHIFT)
+#define REG_FDSTAT_RXCHAN_SHIFT 4
+#define REG_FDSTAT_RXCHAN (0xf << REG_FDSTAT_RXCHAN_SHIFT)
+#define REG_FDSTAT_RXE BIT(3) /* Rx Empty */
+#define REG_FDSTAT_RXF BIT(2) /* Rx Full */
+#define REG_FDSTAT_TXE BIT(1) /* Tx Empty */
+#define REG_FDSTAT_TXF BIT(0) /* Tx Full */
+
+void __iomem *get_fdc_regs(void);
+int is_fdc_interrupt(void);
+int mips_ejtag_fdc_tty_probe(struct mips_cdmm_device *dev);
+int mips_ejtag_fdc_tty_cpu_down(struct mips_cdmm_device *dev);
+int mips_ejtag_fdc_tty_cpu_up(struct mips_cdmm_device *dev);
+
+#endif /* __EJTAG_FDC_H */
--
2.25.1
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