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Message-ID: <20240506140308.4040735-2-andriy.shevchenko@linux.intel.com>
Date: Mon, 6 May 2024 17:00:58 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Tony Lindgren <tony@...mide.com>,
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
linux-kernel@...r.kernel.org,
linux-serial@...r.kernel.org
Cc: Jiri Slaby <jirislaby@...nel.org>,
unil V L <sunilvl@...tanamicro.com>
Subject: [PATCH v1 1/2] serial: 8250: Extract RSA bits
Extract RSA bits to a separate module for better maintenance
and to reduce a churn on 8250_core part changes when it's solely
related to the former. No functional changes intended.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
drivers/tty/serial/8250/8250.h | 7 ++
drivers/tty/serial/8250/8250_core.c | 124 +-------------------------
drivers/tty/serial/8250/8250_rsa.c | 133 ++++++++++++++++++++++++++++
drivers/tty/serial/8250/Makefile | 1 +
4 files changed, 145 insertions(+), 120 deletions(-)
create mode 100644 drivers/tty/serial/8250/8250_rsa.c
diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h
index 6a7b286f6f5a..ac218412e54e 100644
--- a/drivers/tty/serial/8250/8250.h
+++ b/drivers/tty/serial/8250/8250.h
@@ -111,6 +111,7 @@ struct serial8250_config {
#define SERIAL8250_PORT(_base, _irq) SERIAL8250_PORT_FLAGS(_base, _irq, 0)
+extern const struct uart_ops *univ8250_port_base_ops;
static inline int serial_in(struct uart_8250_port *up, int offset)
{
@@ -301,6 +302,12 @@ static inline int serial8250_pnp_init(void) { return 0; }
static inline void serial8250_pnp_exit(void) { }
#endif
+#ifdef CONFIG_SERIAL_8250_RSA
+void univ8250_rsa_support(struct uart_ops *ops);
+#else
+static inline void univ8250_rsa_support(struct uart_ops *ops) { }
+#endif
+
#ifdef CONFIG_SERIAL_8250_FINTEK
int fintek_8250_probe(struct uart_8250_port *uart);
#else
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index ff15022369e4..51432f89919c 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -77,13 +77,6 @@ static const struct old_serial_port old_serial_port[] = {
#define UART_NR CONFIG_SERIAL_8250_NR_UARTS
-#ifdef CONFIG_SERIAL_8250_RSA
-
-#define PORT_RSA_MAX 4
-static unsigned long probe_rsa[PORT_RSA_MAX];
-static unsigned int probe_rsa_count;
-#endif /* CONFIG_SERIAL_8250_RSA */
-
struct irq_info {
struct hlist_node node;
int irq;
@@ -348,44 +341,7 @@ static void univ8250_release_irq(struct uart_8250_port *up)
serial_unlink_irq_chain(up);
}
-#ifdef CONFIG_SERIAL_8250_RSA
-static int serial8250_request_rsa_resource(struct uart_8250_port *up)
-{
- unsigned long start = UART_RSA_BASE << up->port.regshift;
- unsigned int size = 8 << up->port.regshift;
- struct uart_port *port = &up->port;
- int ret = -EINVAL;
-
- switch (port->iotype) {
- case UPIO_HUB6:
- case UPIO_PORT:
- start += port->iobase;
- if (request_region(start, size, "serial-rsa"))
- ret = 0;
- else
- ret = -EBUSY;
- break;
- }
-
- return ret;
-}
-
-static void serial8250_release_rsa_resource(struct uart_8250_port *up)
-{
- unsigned long offset = UART_RSA_BASE << up->port.regshift;
- unsigned int size = 8 << up->port.regshift;
- struct uart_port *port = &up->port;
-
- switch (port->iotype) {
- case UPIO_HUB6:
- case UPIO_PORT:
- release_region(port->iobase + offset, size);
- break;
- }
-}
-#endif
-
-static const struct uart_ops *base_ops;
+const struct uart_ops *univ8250_port_base_ops = NULL;
static struct uart_ops univ8250_port_ops;
static const struct uart_8250_ops univ8250_driver_ops = {
@@ -424,69 +380,6 @@ void serial8250_set_isa_configurator(
}
EXPORT_SYMBOL(serial8250_set_isa_configurator);
-#ifdef CONFIG_SERIAL_8250_RSA
-
-static void univ8250_config_port(struct uart_port *port, int flags)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
-
- up->probe &= ~UART_PROBE_RSA;
- if (port->type == PORT_RSA) {
- if (serial8250_request_rsa_resource(up) == 0)
- up->probe |= UART_PROBE_RSA;
- } else if (flags & UART_CONFIG_TYPE) {
- int i;
-
- for (i = 0; i < probe_rsa_count; i++) {
- if (probe_rsa[i] == up->port.iobase) {
- if (serial8250_request_rsa_resource(up) == 0)
- up->probe |= UART_PROBE_RSA;
- break;
- }
- }
- }
-
- base_ops->config_port(port, flags);
-
- if (port->type != PORT_RSA && up->probe & UART_PROBE_RSA)
- serial8250_release_rsa_resource(up);
-}
-
-static int univ8250_request_port(struct uart_port *port)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
- int ret;
-
- ret = base_ops->request_port(port);
- if (ret == 0 && port->type == PORT_RSA) {
- ret = serial8250_request_rsa_resource(up);
- if (ret < 0)
- base_ops->release_port(port);
- }
-
- return ret;
-}
-
-static void univ8250_release_port(struct uart_port *port)
-{
- struct uart_8250_port *up = up_to_u8250p(port);
-
- if (port->type == PORT_RSA)
- serial8250_release_rsa_resource(up);
- base_ops->release_port(port);
-}
-
-static void univ8250_rsa_support(struct uart_ops *ops)
-{
- ops->config_port = univ8250_config_port;
- ops->request_port = univ8250_request_port;
- ops->release_port = univ8250_release_port;
-}
-
-#else
-#define univ8250_rsa_support(x) do { } while (0)
-#endif /* CONFIG_SERIAL_8250_RSA */
-
static inline void serial8250_apply_quirks(struct uart_8250_port *up)
{
up->port.quirks |= skip_txen_test ? UPQ_NO_TXEN_TEST : 0;
@@ -504,8 +397,8 @@ static struct uart_8250_port *serial8250_setup_port(int index)
up->port.port_id = index;
serial8250_init_port(up);
- if (!base_ops)
- base_ops = up->port.ops;
+ if (!univ8250_port_base_ops)
+ univ8250_port_base_ops = up->port.ops;
up->port.ops = &univ8250_port_ops;
timer_setup(&up->timer, serial8250_timeout, 0);
@@ -539,7 +432,7 @@ static void __init serial8250_isa_init_ports(void)
serial8250_setup_port(i);
/* chain base port ops to support Remote Supervisor Adapter */
- univ8250_port_ops = *base_ops;
+ univ8250_port_ops = *univ8250_port_base_ops;
univ8250_rsa_support(&univ8250_port_ops);
if (share_irqs)
@@ -1312,10 +1205,6 @@ MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STR
module_param(skip_txen_test, uint, 0644);
MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time");
-#ifdef CONFIG_SERIAL_8250_RSA
-module_param_hw_array(probe_rsa, ulong, ioport, &probe_rsa_count, 0444);
-MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
-#endif
MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR);
#ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS
@@ -1338,11 +1227,6 @@ static void __used s8250_options(void)
module_param_cb(share_irqs, ¶m_ops_uint, &share_irqs, 0644);
module_param_cb(nr_uarts, ¶m_ops_uint, &nr_uarts, 0644);
module_param_cb(skip_txen_test, ¶m_ops_uint, &skip_txen_test, 0644);
-#ifdef CONFIG_SERIAL_8250_RSA
- __module_param_call(MODULE_PARAM_PREFIX, probe_rsa,
- ¶m_array_ops, .arr = &__param_arr_probe_rsa,
- 0444, -1, 0);
-#endif
}
#else
MODULE_ALIAS("8250_core");
diff --git a/drivers/tty/serial/8250/8250_rsa.c b/drivers/tty/serial/8250/8250_rsa.c
new file mode 100644
index 000000000000..dfaa613e452d
--- /dev/null
+++ b/drivers/tty/serial/8250/8250_rsa.c
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+
+#include <linux/serial.h>
+#include <linux/serial_8250.h>
+
+#include "8250.h"
+
+#define PORT_RSA_MAX 4
+static unsigned long probe_rsa[PORT_RSA_MAX];
+static unsigned int probe_rsa_count;
+
+static int rsa8250_request_resource(struct uart_8250_port *up)
+{
+ unsigned long start = UART_RSA_BASE << up->port.regshift;
+ unsigned int size = 8 << up->port.regshift;
+ struct uart_port *port = &up->port;
+ int ret = -EINVAL;
+
+ switch (port->iotype) {
+ case UPIO_HUB6:
+ case UPIO_PORT:
+ start += port->iobase;
+ if (request_region(start, size, "serial-rsa"))
+ ret = 0;
+ else
+ ret = -EBUSY;
+ break;
+ }
+
+ return ret;
+}
+
+static void rsa8250_release_resource(struct uart_8250_port *up)
+{
+ unsigned long offset = UART_RSA_BASE << up->port.regshift;
+ unsigned int size = 8 << up->port.regshift;
+ struct uart_port *port = &up->port;
+
+ switch (port->iotype) {
+ case UPIO_HUB6:
+ case UPIO_PORT:
+ release_region(port->iobase + offset, size);
+ break;
+ }
+}
+
+static void univ8250_config_port(struct uart_port *port, int flags)
+{
+ struct uart_8250_port *up = up_to_u8250p(port);
+ unsigned int i;
+
+ up->probe &= ~UART_PROBE_RSA;
+ if (port->type == PORT_RSA) {
+ if (rsa8250_request_resource(up) == 0)
+ up->probe |= UART_PROBE_RSA;
+ } else if (flags & UART_CONFIG_TYPE) {
+ for (i = 0; i < probe_rsa_count; i++) {
+ if (probe_rsa[i] == up->port.iobase) {
+ if (rsa8250_request_resource(up) == 0)
+ up->probe |= UART_PROBE_RSA;
+ break;
+ }
+ }
+ }
+
+ univ8250_port_base_ops->config_port(port, flags);
+
+ if (port->type != PORT_RSA && up->probe & UART_PROBE_RSA)
+ rsa8250_release_resource(up);
+}
+
+static int univ8250_request_port(struct uart_port *port)
+{
+ struct uart_8250_port *up = up_to_u8250p(port);
+ int ret;
+
+ ret = univ8250_port_base_ops->request_port(port);
+ if (ret == 0 && port->type == PORT_RSA) {
+ ret = rsa8250_request_resource(up);
+ if (ret < 0)
+ univ8250_port_base_ops->release_port(port);
+ }
+
+ return ret;
+}
+
+static void univ8250_release_port(struct uart_port *port)
+{
+ struct uart_8250_port *up = up_to_u8250p(port);
+
+ if (port->type == PORT_RSA)
+ rsa8250_release_resource(up);
+ univ8250_port_base_ops->release_port(port);
+}
+
+void univ8250_rsa_support(struct uart_ops *ops)
+{
+ ops->config_port = univ8250_config_port;
+ ops->request_port = univ8250_request_port;
+ ops->release_port = univ8250_release_port;
+}
+
+module_param_hw_array(probe_rsa, ulong, ioport, &probe_rsa_count, 0444);
+MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
+
+#ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS
+#ifndef MODULE
+/*
+ * Keep the old "8250" name working as well for the module options so we don't
+ * break people. We need to keep the names identical and the convenient macros
+ * will happily refuse to let us do that by failing the build with redefinition
+ * errors of global variables. So we stick them inside a dummy function to
+ * avoid those conflicts. The options still get parsed, and the redefined
+ * MODULE_PARAM_PREFIX lets us keep the "8250." syntax alive.
+ *
+ * This is hacky. I'm sorry.
+ */
+static void __used rsa8250_options(void)
+{
+#undef MODULE_PARAM_PREFIX
+#define MODULE_PARAM_PREFIX "8250_core."
+
+ __module_param_call(MODULE_PARAM_PREFIX, probe_rsa,
+ ¶m_array_ops, .arr = &__param_arr_probe_rsa,
+ 0444, -1, 0);
+}
+#endif
+#endif
diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
index 69ac00270547..96d97184d320 100644
--- a/drivers/tty/serial/8250/Makefile
+++ b/drivers/tty/serial/8250/Makefile
@@ -6,6 +6,7 @@
obj-$(CONFIG_SERIAL_8250) += 8250.o 8250_base.o
8250-y := 8250_core.o
8250-$(CONFIG_SERIAL_8250_PNP) += 8250_pnp.o
+8250-$(CONFIG_SERIAL_8250_RSA) += 8250_rsa.o
8250_base-y := 8250_port.o
8250_base-$(CONFIG_SERIAL_8250_DMA) += 8250_dma.o
8250_base-$(CONFIG_SERIAL_8250_DWLIB) += 8250_dwlib.o
--
2.43.0.rc1.1336.g36b5255a03ac
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