From b7d5398aee23f4dd6b91dc64026866894e0743cb Mon Sep 17 00:00:00 2001
From: Huibin Hong <huibin.hong@rock-chips.com>
Date: Sat, 26 Mar 2022 06:54:17 +0000
Subject: [PATCH] serial: 8250: do not compile codes that are not used by dw
 8250

To save memory space for ROCKCHIP_MINI_KERNEL

Changes to vmlinux size:
Before:
   text	   data	    bss	    dec	    hex	filename
4249223	1766500	 134616	6150339	 5dd8c3	vmlinux

After:
   text	   data	    bss	    dec	    hex	filename
4248379	1763012	 134616	6146007	 5dc7d7	vmlinux

delta: 4332 (dec)

Signed-off-by: Huibin Hong <huibin.hong@rock-chips.com>
Change-Id: Ib1cefe62cf968489cffe37043b29c341d4c60788
---
 drivers/tty/serial/8250/8250_dw.c   | 9 +++++++++
 drivers/tty/serial/8250/8250_port.c | 8 ++++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 34b47352a136..711224402860 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -446,6 +446,10 @@ static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data)
 		id = of_alias_get_id(np, "serial");
 		if (id >= 0)
 			p->line = id;
+
+		if (IS_ENABLED(CONFIG_ROCKCHIP_MINI_KERNEL))
+			return;
+
 #ifdef CONFIG_64BIT
 		if (of_device_is_compatible(np, "cavium,octeon-3860-uart")) {
 			p->serial_in = dw8250_serial_inq;
@@ -471,6 +475,9 @@ static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data)
 		data->uart_16550_compatible = true;
 	}
 
+	if (IS_ENABLED(CONFIG_ROCKCHIP_MINI_KERNEL))
+		return;
+
 	/* Platforms with iDMA 64-bit */
 	if (platform_get_resource_byname(to_platform_device(p->dev),
 					 IORESOURCE_MEM, "lpss_priv")) {
@@ -775,9 +782,11 @@ static const struct dev_pm_ops dw8250_pm_ops = {
 
 static const struct of_device_id dw8250_of_match[] = {
 	{ .compatible = "snps,dw-apb-uart" },
+#ifndef CONFIG_ROCKCHIP_MINI_KERNEL
 	{ .compatible = "cavium,octeon-3860-uart" },
 	{ .compatible = "marvell,armada-38x-uart" },
 	{ .compatible = "renesas,rzn1-uart" },
+#endif
 	{ /* Sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, dw8250_of_match);
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index a872e0c5621c..3365273cca95 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -56,6 +56,7 @@
  * Here we define the default xmit fifo size used for each type of UART.
  */
 static const struct serial8250_config uart_config[] = {
+#ifndef CONFIG_ROCKCHIP_MINI_KERNEL
 	[PORT_UNKNOWN] = {
 		.name		= "unknown",
 		.fifo_size	= 1,
@@ -76,6 +77,7 @@ static const struct serial8250_config uart_config[] = {
 		.fifo_size	= 1,
 		.tx_loadsz	= 1,
 	},
+#endif
 	[PORT_16550A] = {
 		.name		= "16550A",
 		.fifo_size	= 16,
@@ -84,6 +86,7 @@ static const struct serial8250_config uart_config[] = {
 		.rxtrig_bytes	= {1, 4, 8, 14},
 		.flags		= UART_CAP_FIFO,
 	},
+#ifndef CONFIG_ROCKCHIP_MINI_KERNEL
 	[PORT_CIRRUS] = {
 		.name		= "Cirrus",
 		.fifo_size	= 1,
@@ -306,6 +309,7 @@ static const struct serial8250_config uart_config[] = {
 		.rxtrig_bytes	= {1, 32, 64, 112},
 		.flags		= UART_CAP_FIFO | UART_CAP_SLEEP,
 	},
+#endif
 };
 
 /* Uart divisor latch read */
@@ -383,6 +387,7 @@ static void au_serial_dl_write(struct uart_8250_port *up, int value)
 
 #endif
 
+#ifndef CONFIG_ROCKCHIP_MINI_KERNEL
 static unsigned int hub6_serial_in(struct uart_port *p, int offset)
 {
 	offset = offset << p->regshift;
@@ -456,6 +461,7 @@ static void io_serial_out(struct uart_port *p, int offset, int value)
 	offset = offset << p->regshift;
 	outb(value, p->iobase + offset);
 }
+#endif
 
 static int serial8250_default_handle_irq(struct uart_port *port);
 
@@ -466,6 +472,7 @@ static void set_io_from_upio(struct uart_port *p)
 	up->dl_read = default_serial_dl_read;
 	up->dl_write = default_serial_dl_write;
 
+#ifndef CONFIG_ROCKCHIP_MINI_KERNEL
 	switch (p->iotype) {
 	case UPIO_HUB6:
 		p->serial_in = hub6_serial_in;
@@ -506,6 +513,7 @@ static void set_io_from_upio(struct uart_port *p)
 		p->serial_out = io_serial_out;
 		break;
 	}
+#endif
 	/* Remember loaded iotype */
 	up->cur_iotype = p->iotype;
 	p->handle_irq = serial8250_default_handle_irq;