[PATCH 3/3] x86: ns16550: Rework driver to allow for x86 I/O space
michel at reverze.net
michel at reverze.net
Fri Apr 4 06:41:39 PDT 2014
From: Michel Stam <m.stam at fugro.nl>
The current implementation fakes a memory-mapped I/O device
at 0x3f8 and 0x2f8, then uses platform read/write functions
to do the actual reading and writing. These platform functions
only exist for the x86 platform; better to move the I/O
routines into the driver and have the driver request I/O ports
using request_ioport_region.
---
arch/arm/boards/eukrea_cpuimx27/eukrea_cpuimx27.c | 2 +-
arch/arm/mach-mvebu/armada-370-xp.c | 3 +-
arch/arm/mach-mvebu/kirkwood.c | 3 +-
arch/arm/mach-socfpga/xload.c | 4 +-
arch/arm/mach-tegra/tegra20.c | 2 +-
arch/mips/boards/dlink-dir-320/serial.c | 2 +-
arch/mips/boards/loongson-ls1b/serial.c | 2 +-
arch/mips/mach-ar231x/ar231x.c | 2 +-
arch/mips/mach-xburst/serial.c | 60 ++++++++++
arch/openrisc/boards/generic/generic.c | 2 +-
arch/ppc/boards/freescale-p1022ds/p1022ds.c | 2 +-
arch/ppc/boards/freescale-p2020rdb/p2020rdb.c | 3 +-
arch/ppc/boards/geip-da923rc/da923rc.c | 3 +-
arch/x86/boards/x86_generic/generic_pc.c | 5 +-
arch/x86/mach-i386/Makefile | 1 -
arch/x86/mach-i386/generic.c | 34 ------
drivers/serial/serial_ns16550.c | 122 ++++++++++++++++++---
include/driver.h | 2 +-
include/ns16550.h | 11 +--
19 files changed, 187 insertions(+), 78 deletions(-)
create mode 100644 arch/mips/mach-xburst/serial.c
delete mode 100644 arch/x86/mach-i386/generic.c
diff --git a/arch/arm/boards/eukrea_cpuimx27/eukrea_cpuimx27.c b/arch/arm/boards/eukrea_cpuimx27/eukrea_cpuimx27.c
index e2ad1c8..69967c5 100644
--- a/arch/arm/boards/eukrea_cpuimx27/eukrea_cpuimx27.c
+++ b/arch/arm/boards/eukrea_cpuimx27/eukrea_cpuimx27.c
@@ -223,7 +223,7 @@ static int eukrea_cpuimx27_console_init(void)
imx27_setup_weimcs(3, 0x0000D603, 0x0D1D0D01, 0x00D20000);
#ifdef CONFIG_DRIVER_SERIAL_NS16550
add_ns16550_device(DEVICE_ID_DYNAMIC, MX27_CS3_BASE_ADDR + QUART_OFFSET, 0xf,
- IORESOURCE_MEM_16BIT, &quad_uart_serial_plat);
+ IORESOURCE_MEM | IORESOURCE_MEM_16BIT, &quad_uart_serial_plat);
#endif
return 0;
}
diff --git a/arch/arm/mach-mvebu/armada-370-xp.c b/arch/arm/mach-mvebu/armada-370-xp.c
index 776b4c0..209be0b 100644
--- a/arch/arm/mach-mvebu/armada-370-xp.c
+++ b/arch/arm/mach-mvebu/armada-370-xp.c
@@ -60,7 +60,8 @@ static int armada_370_xp_add_uart(void)
uart_plat.clock = clk_get_rate(tclk);
if (!add_ns16550_device(DEVICE_ID_DYNAMIC,
(unsigned int)CONSOLE_UART_BASE, 32,
- IORESOURCE_MEM_32BIT, &uart_plat))
+ IORESOURCE_MEM | IORESOURCE_MEM_32BIT,
+ &uart_plat))
return -ENODEV;
return 0;
}
diff --git a/arch/arm/mach-mvebu/kirkwood.c b/arch/arm/mach-mvebu/kirkwood.c
index 1284220..c79d130 100644
--- a/arch/arm/mach-mvebu/kirkwood.c
+++ b/arch/arm/mach-mvebu/kirkwood.c
@@ -58,7 +58,8 @@ static int kirkwood_add_uart(void)
uart_plat.clock = clk_get_rate(tclk);
if (!add_ns16550_device(DEVICE_ID_DYNAMIC,
(unsigned int)CONSOLE_UART_BASE, 32,
- IORESOURCE_MEM_32BIT, &uart_plat))
+ IORESOURCE_MEM | IORESOURCE_MEM_32BIT,
+ &uart_plat))
return -ENODEV;
return 0;
}
diff --git a/arch/arm/mach-socfpga/xload.c b/arch/arm/mach-socfpga/xload.c
index 0b99db0..6586ada 100644
--- a/arch/arm/mach-socfpga/xload.c
+++ b/arch/arm/mach-socfpga/xload.c
@@ -45,8 +45,8 @@ static void socfpga_uart_init(void)
clks[uart] = clk_fixed("uart", 100000000);
clkdev_add_physbase(clks[uart], CYCLONE5_UART0_ADDRESS, NULL);
clkdev_add_physbase(clks[uart], CYCLONE5_UART1_ADDRESS, NULL);
- add_ns16550_device(0, 0xffc02000, 1024, IORESOURCE_MEM_8BIT,
- &uart_pdata);
+ add_ns16550_device(0, 0xffc02000, 1024, IORESOURCE_MEM |
+ IORESOURCE_MEM_8BIT, &uart_pdata);
}
static void socfpga_timer_init(void)
diff --git a/arch/arm/mach-tegra/tegra20.c b/arch/arm/mach-tegra/tegra20.c
index cc2d748..bdd7960 100644
--- a/arch/arm/mach-tegra/tegra20.c
+++ b/arch/arm/mach-tegra/tegra20.c
@@ -50,7 +50,7 @@ static int tegra20_add_debug_console(void)
return -ENODEV;
add_ns16550_device(DEVICE_ID_DYNAMIC, base, 8 << debug_uart.shift,
- IORESOURCE_MEM_8BIT, &debug_uart);
+ IORESOURCE_MEM | IORESOURCE_MEM_8BIT, &debug_uart);
return 0;
}
diff --git a/arch/mips/boards/dlink-dir-320/serial.c b/arch/mips/boards/dlink-dir-320/serial.c
index bddb683..eb87379 100644
--- a/arch/mips/boards/dlink-dir-320/serial.c
+++ b/arch/mips/boards/dlink-dir-320/serial.c
@@ -36,7 +36,7 @@ static int dir320_console_init(void)
/* Register the serial port */
add_ns16550_device(DEVICE_ID_DYNAMIC, DEBUG_LL_UART_ADDR, 8,
- IORESOURCE_MEM_8BIT, &serial_plat);
+ IORESOURCE_MEM | IORESOURCE_MEM_8BIT, &serial_plat);
return 0;
}
diff --git a/arch/mips/boards/loongson-ls1b/serial.c b/arch/mips/boards/loongson-ls1b/serial.c
index d8e0f7c..7159ab7 100644
--- a/arch/mips/boards/loongson-ls1b/serial.c
+++ b/arch/mips/boards/loongson-ls1b/serial.c
@@ -15,7 +15,7 @@ static int console_init(void)
barebox_set_hostname("ls1b");
add_ns16550_device(DEVICE_ID_DYNAMIC, KSEG1ADDR(LS1X_UART2_BASE),
- 8, IORESOURCE_MEM_8BIT, &serial_plat);
+ 8, IORESOURCE_MEM | IORESOURCE_MEM_8BIT, &serial_plat);
return 0;
}
diff --git a/arch/mips/mach-ar231x/ar231x.c b/arch/mips/mach-ar231x/ar231x.c
index ca912bf..06d2edb 100644
--- a/arch/mips/mach-ar231x/ar231x.c
+++ b/arch/mips/mach-ar231x/ar231x.c
@@ -189,7 +189,7 @@ static int ar2312_console_init(void)
/* Register the serial port */
serial_plat.clock = ar2312_sys_frequency();
add_ns16550_device(DEVICE_ID_DYNAMIC, KSEG1ADDR(AR2312_UART0),
- 8 << AR2312_UART_SHIFT, IORESOURCE_MEM_8BIT, &serial_plat);
+ 8 << AR2312_UART_SHIFT, IORESOURCE_MEM | IORESOURCE_MEM_8BIT, &serial_plat);
return 0;
}
console_initcall(ar2312_console_init);
diff --git a/arch/mips/mach-xburst/serial.c b/arch/mips/mach-xburst/serial.c
new file mode 100644
index 0000000..4365d19
--- /dev/null
+++ b/arch/mips/mach-xburst/serial.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2013 Antony Pavlov <antonynpavlov at gmail.com>
+ *
+ * Based on the linux kernel JZ4740 serial support:
+ * Copyright (C) 2010, Lars-Peter Clausen <lars at metafoo.de>
+ *
+ * This file is part of barebox.
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <common.h>
+#include <ns16550.h>
+#include <io.h>
+#include <mach/devices.h>
+
+#define JZ_UART_SHIFT 2
+
+#define ier (1 << JZ_UART_SHIFT)
+#define fcr (2 << JZ_UART_SHIFT)
+
+static void jz_serial_reg_write(unsigned int val, unsigned long base,
+ unsigned char reg_offset)
+{
+ switch (reg_offset) {
+ case fcr:
+ val |= 0x10; /* Enable uart module */
+ break;
+ case ier:
+ val |= (val & 0x4) << 2;
+ break;
+ default:
+ break;
+ }
+
+ writeb(val & 0xff, (void *)(base + reg_offset));
+}
+
+struct device_d *jz_add_uart(int id, unsigned long base, unsigned int clock)
+{
+ struct NS16550_plat *serial_plat;
+
+ serial_plat = xzalloc(sizeof(*serial_plat));
+
+ serial_plat->shift = JZ_UART_SHIFT;
+ serial_plat->reg_write = &jz_serial_reg_write;
+ serial_plat->clock = clock;
+
+ return add_ns16550_device(id, base, 8 << JZ_UART_SHIFT,
+ IORESOURCE_MEM | IORESOURCE_MEM_8BIT, serial_plat);
+}
diff --git a/arch/openrisc/boards/generic/generic.c b/arch/openrisc/boards/generic/generic.c
index 290e05c..1d6ac8a 100644
--- a/arch/openrisc/boards/generic/generic.c
+++ b/arch/openrisc/boards/generic/generic.c
@@ -15,7 +15,7 @@ static int openrisc_console_init(void)
barebox_set_hostname("or1k");
/* Register the serial port */
- add_ns16550_device(DEVICE_ID_DYNAMIC, OPENRISC_SOPC_UART_BASE, 1024, IORESOURCE_MEM_8BIT, &serial_plat);
+ add_ns16550_device(DEVICE_ID_DYNAMIC, OPENRISC_SOPC_UART_BASE, 1024, IORESOURCE_MEM | IORESOURCE_MEM_8BIT, &serial_plat);
#ifdef CONFIG_DRIVER_NET_ETHOC
add_generic_device("ethoc", DEVICE_ID_DYNAMIC, NULL,
diff --git a/arch/ppc/boards/freescale-p1022ds/p1022ds.c b/arch/ppc/boards/freescale-p1022ds/p1022ds.c
index c800064..57e7953 100644
--- a/arch/ppc/boards/freescale-p1022ds/p1022ds.c
+++ b/arch/ppc/boards/freescale-p1022ds/p1022ds.c
@@ -130,7 +130,7 @@ static int p1022ds_console_init(void)
serial_plat.clock = fsl_get_bus_freq(0);
add_ns16550_device(DEVICE_ID_DYNAMIC, CFG_IMMR + 0x4500, 16,
- IORESOURCE_MEM_8BIT, &serial_plat);
+ IORESOURCE_MEM | IORESOURCE_MEM_8BIT, &serial_plat);
return 0;
}
diff --git a/arch/ppc/boards/freescale-p2020rdb/p2020rdb.c b/arch/ppc/boards/freescale-p2020rdb/p2020rdb.c
index 229ae41..385a436 100644
--- a/arch/ppc/boards/freescale-p2020rdb/p2020rdb.c
+++ b/arch/ppc/boards/freescale-p2020rdb/p2020rdb.c
@@ -112,7 +112,8 @@ static int p2020_console_init(void)
serial_plat.clock = fsl_get_bus_freq(0);
- add_ns16550_device(DEVICE_ID_DYNAMIC, 0xffe04500, 16, IORESOURCE_MEM_8BIT,
+ add_ns16550_device(DEVICE_ID_DYNAMIC, 0xffe04500, 16,
+ IORESOURCE_MEM | IORESOURCE_MEM_8BIT,
&serial_plat);
return 0;
}
diff --git a/arch/ppc/boards/geip-da923rc/da923rc.c b/arch/ppc/boards/geip-da923rc/da923rc.c
index 976aa8d..3d77349 100644
--- a/arch/ppc/boards/geip-da923rc/da923rc.c
+++ b/arch/ppc/boards/geip-da923rc/da923rc.c
@@ -115,7 +115,8 @@ static int da923rc_console_init(void)
barebox_set_model("unknown");
serial_plat.clock = fsl_get_bus_freq(0);
- add_ns16550_device(1, CFG_CCSRBAR + 0x4600, 16, IORESOURCE_MEM_8BIT,
+ add_ns16550_device(1, CFG_CCSRBAR + 0x4600, 16,
+ IORESOURCE_MEM | IORESOURCE_MEM_8BIT,
&serial_plat);
return 0;
}
diff --git a/arch/x86/boards/x86_generic/generic_pc.c b/arch/x86/boards/x86_generic/generic_pc.c
index 895b88d..69c6f58 100644
--- a/arch/x86/boards/x86_generic/generic_pc.c
+++ b/arch/x86/boards/x86_generic/generic_pc.c
@@ -141,8 +141,6 @@ device_initcall(devices_init);
static struct NS16550_plat serial_plat = {
.clock = 1843200,
- .reg_read = x86_uart_read,
- .reg_write = x86_uart_write,
};
static int pc_console_init(void)
@@ -151,7 +149,8 @@ static int pc_console_init(void)
barebox_set_hostname("x86");
/* Register the serial port */
- add_ns16550_device(DEVICE_ID_DYNAMIC, 0x3f8, 8, 0, &serial_plat);
+ add_ns16550_device(DEVICE_ID_DYNAMIC, 0x3f8, 8, IORESOURCE_IO, &serial_plat);
+ add_ns16550_device(DEVICE_ID_DYNAMIC, 0x2f8, 8, IORESOURCE_IO, &serial_plat);
return 0;
}
diff --git a/arch/x86/mach-i386/Makefile b/arch/x86/mach-i386/Makefile
index 10712e6..e46aa5b 100644
--- a/arch/x86/mach-i386/Makefile
+++ b/arch/x86/mach-i386/Makefile
@@ -1,4 +1,3 @@
-obj-y += generic.o
obj-y += reset.o
# reference clocksource
diff --git a/arch/x86/mach-i386/generic.c b/arch/x86/mach-i386/generic.c
deleted file mode 100644
index 69cf53c..0000000
--- a/arch/x86/mach-i386/generic.c
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- * Copyright (C) 2009 Juergen Beisert, Pengutronix
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- *
- */
-
-/**
- * @file
- * @brief x86 Architecture Initialization routines
- */
-
-#include <io.h>
-
-/** to work with the 8250 UART driver implementation we need this function */
-unsigned int x86_uart_read(unsigned long base, unsigned char reg_idx)
-{
- return inb(base + reg_idx);
-}
-
-/** to work with the 8250 UART driver implementation we need this function */
-void x86_uart_write(unsigned int val, unsigned long base, unsigned char reg_idx)
-{
- outb(val, base + reg_idx);
-}
diff --git a/drivers/serial/serial_ns16550.c b/drivers/serial/serial_ns16550.c
index 0c00eb1..dfe572d 100644
--- a/drivers/serial/serial_ns16550.c
+++ b/drivers/serial/serial_ns16550.c
@@ -47,6 +47,7 @@ struct ns16550_priv {
struct console_device cdev;
struct NS16550_plat plat;
int access_width;
+ int mmio;
struct clk *clk;
uint32_t fcrval;
};
@@ -62,6 +63,87 @@ struct ns16550_drvdata {
};
/**
+ * @brief read system i/o (byte)
+ * @param[in] addr address to read
+ * @param[in] mmio memory i/o space or i/o port space
+ */
+static inline uint8_t ns16550_sys_readb(void __iomem *addr, int mmio)
+{
+ if (mmio)
+ return readb(addr);
+ else
+ return (uint8_t) inb((int) addr);
+}
+
+/**
+ * @brief read system i/o (word)
+ * @param[in] addr address to read
+ * @param[in] mmio memory i/o space or i/o port space
+ */
+static inline uint16_t ns16550_sys_readw(void __iomem *addr, int mmio)
+{
+ if (mmio)
+ return readw(addr);
+ else
+ return (uint16_t) inw((int) addr);
+}
+
+/**
+ * @brief read system i/o (dword)
+ * @param[in] addr address to read
+ * @param[in] mmio memory i/o space or i/o port space
+ */
+static inline uint32_t ns16550_sys_readl(void __iomem *addr, int mmio)
+{
+ if (mmio)
+ return readl(addr);
+ else
+ return (uint32_t) inl((int) addr);
+}
+
+/**
+ * @brief write system i/o (byte)
+ * @param[in] val data to write
+ * @param[in] addr address to write to
+ * @param[in] mmio memory i/o space or i/o port space
+ */
+static inline void ns16550_sys_writeb(uint8_t val, void __iomem *addr, int mmio)
+{
+ if (mmio)
+ writeb(val, addr);
+ else
+ outb(val, (int) addr);
+}
+
+/**
+ * @brief read system i/o (word)
+ * @param[in] val data to write
+ * @param[in] addr address to write to
+ * @param[in] mmio memory i/o space or i/o port space
+ */
+static inline void ns16550_sys_writew(uint16_t val, void __iomem *addr, int mmio)
+{
+ if (mmio)
+ writew(val, addr);
+ else
+ outw(val, (int) addr);
+}
+
+/**
+ * @brief read system i/o (dword)
+ * @param[in] val data to write
+ * @param[in] addr address to write to
+ * @param[in] mmio memory i/o space or i/o port space
+ */
+static inline void ns16550_sys_writel(uint32_t val, void __iomem *addr, int mmio)
+{
+ if (mmio)
+ writel(val, addr);
+ else
+ outl(val, (int) addr);
+}
+
+/**
* @brief read register
*
* @param[in] cdev pointer to console device
@@ -78,16 +160,13 @@ static uint32_t ns16550_read(struct console_device *cdev, uint32_t off)
off <<= plat->shift;
- if (plat->reg_read)
- return plat->reg_read((unsigned long)dev->priv, off);
-
switch (width) {
case IORESOURCE_MEM_8BIT:
- return readb(dev->priv + off);
+ return ns16550_sys_readb(dev->priv + off, priv->mmio);
case IORESOURCE_MEM_16BIT:
- return readw(dev->priv + off);
+ return ns16550_sys_readw(dev->priv + off, priv->mmio);
case IORESOURCE_MEM_32BIT:
- return readl(dev->priv + off);
+ return ns16550_sys_readl(dev->priv + off, priv->mmio);
}
return -1;
}
@@ -109,20 +188,15 @@ static void ns16550_write(struct console_device *cdev, uint32_t val,
off <<= plat->shift;
- if (plat->reg_write) {
- plat->reg_write(val, (unsigned long)dev->priv, off);
- return;
- }
-
switch (width) {
case IORESOURCE_MEM_8BIT:
- writeb(val & 0xff, dev->priv + off);
+ ns16550_sys_writeb(val & 0xff, dev->priv + off, priv->mmio);
break;
case IORESOURCE_MEM_16BIT:
- writew(val & 0xffff, dev->priv + off);
+ ns16550_sys_writew(val & 0xffff, dev->priv + off, priv->mmio);
break;
case IORESOURCE_MEM_32BIT:
- writel(val, dev->priv + off);
+ ns16550_sys_writel(val, dev->priv + off, priv->mmio);
break;
}
}
@@ -293,16 +367,32 @@ static int ns16550_probe(struct device_d *dev)
struct console_device *cdev;
struct NS16550_plat *plat = (struct NS16550_plat *)dev->platform_data;
struct ns16550_drvdata *devtype;
+ struct resource *res;
int ret;
ret = dev_get_drvdata(dev, (unsigned long *)&devtype);
if (ret)
devtype = &ns16550_drvdata;
- dev->priv = dev_request_mem_region(dev, 0);
-
priv = xzalloc(sizeof(*priv));
+ res = dev_get_resource(dev, IORESOURCE_MEM, 0);
+ priv->mmio = (res != NULL);
+ if (res)
+ {
+ res = request_iomem_region(dev_name(dev),res->start,res->end);
+ }
+ else
+ {
+ res = dev_get_resource(dev, IORESOURCE_IO, 0);
+ if (res)
+ res = request_ioport_region(dev_name(dev),res->start,res->end);
+ }
+ if (!res)
+ goto err;
+ dev->priv = (void __force __iomem *) res->start;
+
+
if (plat)
priv->plat = *plat;
else
diff --git a/include/driver.h b/include/driver.h
index 37797c7..ff4a5a1 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -276,7 +276,7 @@ static inline struct device_d *add_ns16550_device(int id, resource_size_t start,
resource_size_t size, int flags, struct NS16550_plat *pdata)
{
return add_generic_device("ns16550_serial", id, NULL, start, size,
- IORESOURCE_MEM | flags, pdata);
+ flags, pdata);
}
#ifdef CONFIG_DRIVER_NET_DM9K
diff --git a/include/ns16550.h b/include/ns16550.h
index 36aa5ff..876bb04 100644
--- a/include/ns16550.h
+++ b/include/ns16550.h
@@ -33,18 +33,9 @@
struct NS16550_plat {
/** Clock speed */
unsigned int clock;
- /**
- * register read access capability
- */
- unsigned int (*reg_read) (unsigned long base, unsigned char reg_offset);
- /**
- * register write access capability
- */
- void (*reg_write) (unsigned int val, unsigned long base,
- unsigned char reg_offset);
-
int shift;
unsigned int flags;
+ int mmio;
#define NS16650_FLAG_DISABLE_FIFO 1
};
--
1.7.1
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