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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-21 11:44:01 +08:00

x86, mrst: remove Moorestown specific serial drivers

Intel Moorestown platform support was removed few years ago. This is a follow
up which removes Moorestown specific code for the serial devices. It includes
mrst_max3110 and earlyprintk bits.

This was used on SFI (Medfield, Clovertrail) based platforms as well, though
new ones use normal serial interface for the console service.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: David Cohen <david.a.cohen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2015-01-12 15:17:22 +02:00 committed by Greg Kroah-Hartman
parent 934084a9d2
commit 874e52086f
9 changed files with 4 additions and 1242 deletions

View File

@ -136,9 +136,6 @@ extern enum intel_mid_timer_options intel_mid_timer_options;
#define SFI_MTMR_MAX_NUM 8 #define SFI_MTMR_MAX_NUM 8
#define SFI_MRTC_MAX 8 #define SFI_MRTC_MAX 8
extern struct console early_mrst_console;
extern void mrst_early_console_init(void);
extern struct console early_hsu_console; extern struct console early_hsu_console;
extern void hsu_early_console_init(const char *); extern void hsu_early_console_init(const char *);

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@ -226,11 +226,6 @@ static int __init setup_early_printk(char *buf)
early_console_register(&xenboot_console, keep); early_console_register(&xenboot_console, keep);
#endif #endif
#ifdef CONFIG_EARLY_PRINTK_INTEL_MID #ifdef CONFIG_EARLY_PRINTK_INTEL_MID
if (!strncmp(buf, "mrst", 4)) {
mrst_early_console_init();
early_console_register(&early_mrst_console, keep);
}
if (!strncmp(buf, "hsu", 3)) { if (!strncmp(buf, "hsu", 3)) {
hsu_early_console_init(buf + 3); hsu_early_console_init(buf + 3);
early_console_register(&early_hsu_console, keep); early_console_register(&early_hsu_console, keep);

View File

@ -16,8 +16,6 @@ obj-$(subst m,y,$(CONFIG_INPUT_MPU3050)) += platform_mpu3050.o
obj-$(subst m,y,$(CONFIG_INPUT_BMA150)) += platform_bma023.o obj-$(subst m,y,$(CONFIG_INPUT_BMA150)) += platform_bma023.o
obj-$(subst m,y,$(CONFIG_GPIO_PCA953X)) += platform_tca6416.o obj-$(subst m,y,$(CONFIG_GPIO_PCA953X)) += platform_tca6416.o
obj-$(subst m,y,$(CONFIG_DRM_MEDFIELD)) += platform_tc35876x.o obj-$(subst m,y,$(CONFIG_DRM_MEDFIELD)) += platform_tc35876x.o
# SPI Devices
obj-$(subst m,y,$(CONFIG_SERIAL_MRST_MAX3110)) += platform_max3111.o
# MISC Devices # MISC Devices
obj-$(subst m,y,$(CONFIG_KEYBOARD_GPIO)) += platform_gpio_keys.o obj-$(subst m,y,$(CONFIG_KEYBOARD_GPIO)) += platform_gpio_keys.o
obj-$(subst m,y,$(CONFIG_INTEL_MID_WATCHDOG)) += platform_wdt.o obj-$(subst m,y,$(CONFIG_INTEL_MID_WATCHDOG)) += platform_wdt.o

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@ -1,35 +0,0 @@
/*
* platform_max3111.c: max3111 platform data initilization file
*
* (C) Copyright 2013 Intel Corporation
* Author: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@intel.com>
*
* 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; version 2
* of the License.
*/
#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include <asm/intel-mid.h>
static void __init *max3111_platform_data(void *info)
{
struct spi_board_info *spi_info = info;
int intr = get_gpio_by_name("max3111_int");
spi_info->mode = SPI_MODE_0;
if (intr == -1)
return NULL;
spi_info->irq = intr + INTEL_MID_IRQ_OFFSET;
return NULL;
}
static const struct devs_id max3111_dev_id __initconst = {
.name = "spi_max3111",
.type = SFI_DEV_TYPE_SPI,
.get_platform_data = &max3111_platform_data,
};
sfi_device(max3111_dev_id);

View File

@ -10,15 +10,13 @@
*/ */
/* /*
* This file implements two early consoles named mrst and hsu. * This file implements early console named hsu.
* mrst is based on Maxim3110 spi-uart device, it exists in both * hsu is based on a High Speed UART device which only exists in the Medfield
* Moorestown and Medfield platforms, while hsu is based on a High * platform
* Speed UART device which only exists in the Medfield platform
*/ */
#include <linux/serial_reg.h> #include <linux/serial_reg.h>
#include <linux/serial_mfd.h> #include <linux/serial_mfd.h>
#include <linux/kmsg_dump.h>
#include <linux/console.h> #include <linux/console.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/delay.h> #include <linux/delay.h>
@ -28,216 +26,6 @@
#include <asm/pgtable.h> #include <asm/pgtable.h>
#include <asm/intel-mid.h> #include <asm/intel-mid.h>
#define MRST_SPI_TIMEOUT 0x200000
#define MRST_REGBASE_SPI0 0xff128000
#define MRST_REGBASE_SPI1 0xff128400
#define MRST_CLK_SPI0_REG 0xff11d86c
/* Bit fields in CTRLR0 */
#define SPI_DFS_OFFSET 0
#define SPI_FRF_OFFSET 4
#define SPI_FRF_SPI 0x0
#define SPI_FRF_SSP 0x1
#define SPI_FRF_MICROWIRE 0x2
#define SPI_FRF_RESV 0x3
#define SPI_MODE_OFFSET 6
#define SPI_SCPH_OFFSET 6
#define SPI_SCOL_OFFSET 7
#define SPI_TMOD_OFFSET 8
#define SPI_TMOD_TR 0x0 /* xmit & recv */
#define SPI_TMOD_TO 0x1 /* xmit only */
#define SPI_TMOD_RO 0x2 /* recv only */
#define SPI_TMOD_EPROMREAD 0x3 /* eeprom read mode */
#define SPI_SLVOE_OFFSET 10
#define SPI_SRL_OFFSET 11
#define SPI_CFS_OFFSET 12
/* Bit fields in SR, 7 bits */
#define SR_MASK 0x7f /* cover 7 bits */
#define SR_BUSY (1 << 0)
#define SR_TF_NOT_FULL (1 << 1)
#define SR_TF_EMPT (1 << 2)
#define SR_RF_NOT_EMPT (1 << 3)
#define SR_RF_FULL (1 << 4)
#define SR_TX_ERR (1 << 5)
#define SR_DCOL (1 << 6)
struct dw_spi_reg {
u32 ctrl0;
u32 ctrl1;
u32 ssienr;
u32 mwcr;
u32 ser;
u32 baudr;
u32 txfltr;
u32 rxfltr;
u32 txflr;
u32 rxflr;
u32 sr;
u32 imr;
u32 isr;
u32 risr;
u32 txoicr;
u32 rxoicr;
u32 rxuicr;
u32 msticr;
u32 icr;
u32 dmacr;
u32 dmatdlr;
u32 dmardlr;
u32 idr;
u32 version;
/* Currently operates as 32 bits, though only the low 16 bits matter */
u32 dr;
} __packed;
#define dw_readl(dw, name) __raw_readl(&(dw)->name)
#define dw_writel(dw, name, val) __raw_writel((val), &(dw)->name)
/* Default use SPI0 register for mrst, we will detect Penwell and use SPI1 */
static unsigned long mrst_spi_paddr = MRST_REGBASE_SPI0;
static u32 *pclk_spi0;
/* Always contains an accessible address, start with 0 */
static struct dw_spi_reg *pspi;
static struct kmsg_dumper dw_dumper;
static int dumper_registered;
static void dw_kmsg_dump(struct kmsg_dumper *dumper,
enum kmsg_dump_reason reason)
{
static char line[1024];
size_t len;
/* When run to this, we'd better re-init the HW */
mrst_early_console_init();
while (kmsg_dump_get_line(dumper, true, line, sizeof(line), &len))
early_mrst_console.write(&early_mrst_console, line, len);
}
/* Set the ratio rate to 115200, 8n1, IRQ disabled */
static void max3110_write_config(void)
{
u16 config;
config = 0xc001;
dw_writel(pspi, dr, config);
}
/* Translate char to a eligible word and send to max3110 */
static void max3110_write_data(char c)
{
u16 data;
data = 0x8000 | c;
dw_writel(pspi, dr, data);
}
void mrst_early_console_init(void)
{
u32 ctrlr0 = 0;
u32 spi0_cdiv;
u32 freq; /* Freqency info only need be searched once */
/* Base clk is 100 MHz, the actual clk = 100M / (clk_divider + 1) */
pclk_spi0 = (void *)set_fixmap_offset_nocache(FIX_EARLYCON_MEM_BASE,
MRST_CLK_SPI0_REG);
spi0_cdiv = ((*pclk_spi0) & 0xe00) >> 9;
freq = 100000000 / (spi0_cdiv + 1);
if (intel_mid_identify_cpu() == INTEL_MID_CPU_CHIP_PENWELL)
mrst_spi_paddr = MRST_REGBASE_SPI1;
pspi = (void *)set_fixmap_offset_nocache(FIX_EARLYCON_MEM_BASE,
mrst_spi_paddr);
/* Disable SPI controller */
dw_writel(pspi, ssienr, 0);
/* Set control param, 8 bits, transmit only mode */
ctrlr0 = dw_readl(pspi, ctrl0);
ctrlr0 &= 0xfcc0;
ctrlr0 |= 0xf | (SPI_FRF_SPI << SPI_FRF_OFFSET)
| (SPI_TMOD_TO << SPI_TMOD_OFFSET);
dw_writel(pspi, ctrl0, ctrlr0);
/*
* Change the spi0 clk to comply with 115200 bps, use 100000 to
* calculate the clk dividor to make the clock a little slower
* than real baud rate.
*/
dw_writel(pspi, baudr, freq/100000);
/* Disable all INT for early phase */
dw_writel(pspi, imr, 0x0);
/* Set the cs to spi-uart */
dw_writel(pspi, ser, 0x2);
/* Enable the HW, the last step for HW init */
dw_writel(pspi, ssienr, 0x1);
/* Set the default configuration */
max3110_write_config();
/* Register the kmsg dumper */
if (!dumper_registered) {
dw_dumper.dump = dw_kmsg_dump;
kmsg_dump_register(&dw_dumper);
dumper_registered = 1;
}
}
/* Slave select should be called in the read/write function */
static void early_mrst_spi_putc(char c)
{
unsigned int timeout;
u32 sr;
timeout = MRST_SPI_TIMEOUT;
/* Early putc needs to make sure the TX FIFO is not full */
while (--timeout) {
sr = dw_readl(pspi, sr);
if (!(sr & SR_TF_NOT_FULL))
cpu_relax();
else
break;
}
if (!timeout)
pr_warn("MRST earlycon: timed out\n");
else
max3110_write_data(c);
}
/* Early SPI only uses polling mode */
static void early_mrst_spi_write(struct console *con, const char *str,
unsigned n)
{
int i;
for (i = 0; i < n && *str; i++) {
if (*str == '\n')
early_mrst_spi_putc('\r');
early_mrst_spi_putc(*str);
str++;
}
}
struct console early_mrst_console = {
.name = "earlymrst",
.write = early_mrst_spi_write,
.flags = CON_PRINTBUFFER,
.index = -1,
};
/* /*
* Following is the early console based on Medfield HSU (High * Following is the early console based on Medfield HSU (High
* Speed UART) device. * Speed UART) device.
@ -259,7 +47,7 @@ void hsu_early_console_init(const char *s)
port = clamp_val(port, 0, 2); port = clamp_val(port, 0, 2);
paddr = HSU_PORT_BASE + port * 0x80; paddr = HSU_PORT_BASE + port * 0x80;
phsu = (void *)set_fixmap_offset_nocache(FIX_EARLYCON_MEM_BASE, paddr); phsu = (void __iomem *)set_fixmap_offset_nocache(FIX_EARLYCON_MEM_BASE, paddr);
/* Disable FIFO */ /* Disable FIFO */
writeb(0x0, phsu + UART_FCR); writeb(0x0, phsu + UART_FCR);

View File

@ -482,16 +482,6 @@ config SERIAL_SA1100_CONSOLE
your boot loader (lilo or loadlin) about how to pass options to the your boot loader (lilo or loadlin) about how to pass options to the
kernel at boot time.) kernel at boot time.)
config SERIAL_MRST_MAX3110
tristate "SPI UART driver for Max3110"
depends on SPI_DW_PCI
select SERIAL_CORE
select SERIAL_CORE_CONSOLE
help
This is the UART protocol driver for the MAX3110 device on
the Intel Moorestown platform. On other systems use the max3100
driver.
config SERIAL_MFD_HSU config SERIAL_MFD_HSU
tristate "Medfield High Speed UART support" tristate "Medfield High Speed UART support"
depends on PCI depends on PCI

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@ -77,7 +77,6 @@ obj-$(CONFIG_SERIAL_TIMBERDALE) += timbuart.o
obj-$(CONFIG_SERIAL_GRLIB_GAISLER_APBUART) += apbuart.o obj-$(CONFIG_SERIAL_GRLIB_GAISLER_APBUART) += apbuart.o
obj-$(CONFIG_SERIAL_ALTERA_JTAGUART) += altera_jtaguart.o obj-$(CONFIG_SERIAL_ALTERA_JTAGUART) += altera_jtaguart.o
obj-$(CONFIG_SERIAL_VT8500) += vt8500_serial.o obj-$(CONFIG_SERIAL_VT8500) += vt8500_serial.o
obj-$(CONFIG_SERIAL_MRST_MAX3110) += mrst_max3110.o
obj-$(CONFIG_SERIAL_MFD_HSU) += mfd.o obj-$(CONFIG_SERIAL_MFD_HSU) += mfd.o
obj-$(CONFIG_SERIAL_IFX6X60) += ifx6x60.o obj-$(CONFIG_SERIAL_IFX6X60) += ifx6x60.o
obj-$(CONFIG_SERIAL_PCH_UART) += pch_uart.o obj-$(CONFIG_SERIAL_PCH_UART) += pch_uart.o

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@ -1,909 +0,0 @@
/*
* mrst_max3110.c - spi uart protocol driver for Maxim 3110
*
* Copyright (c) 2008-2010, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* Note:
* 1. From Max3110 spec, the Rx FIFO has 8 words, while the Tx FIFO only has
* 1 word. If SPI master controller doesn't support sclk frequency change,
* then the char need be sent out one by one with some delay
*
* 2. Currently only RX available interrupt is used, no need for waiting TXE
* interrupt for a low speed UART device
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#ifdef CONFIG_MAGIC_SYSRQ
#define SUPPORT_SYSRQ
#endif
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <linux/kthread.h>
#include <linux/spi/spi.h>
#include <linux/pm.h>
#include "mrst_max3110.h"
#define UART_TX_NEEDED 1
#define CON_TX_NEEDED 2
#define BIT_IRQ_PENDING 3
struct uart_max3110 {
struct uart_port port;
struct spi_device *spi;
char name[SPI_NAME_SIZE];
wait_queue_head_t wq;
struct task_struct *main_thread;
struct task_struct *read_thread;
struct mutex thread_mutex;
struct mutex io_mutex;
u32 baud;
u16 cur_conf;
u8 clock;
u8 parity, word_7bits;
u16 irq;
unsigned long uart_flags;
/* console related */
struct circ_buf con_xmit;
};
/* global data structure, may need be removed */
static struct uart_max3110 *pmax;
static int receive_chars(struct uart_max3110 *max,
unsigned short *str, int len);
static int max3110_read_multi(struct uart_max3110 *max);
static void max3110_con_receive(struct uart_max3110 *max);
static int max3110_write_then_read(struct uart_max3110 *max,
const void *txbuf, void *rxbuf, unsigned len, int always_fast)
{
struct spi_device *spi = max->spi;
struct spi_message message;
struct spi_transfer x;
int ret;
mutex_lock(&max->io_mutex);
spi_message_init(&message);
memset(&x, 0, sizeof x);
x.len = len;
x.tx_buf = txbuf;
x.rx_buf = rxbuf;
spi_message_add_tail(&x, &message);
if (always_fast)
x.speed_hz = spi->max_speed_hz;
else if (max->baud)
x.speed_hz = max->baud;
/* Do the i/o */
ret = spi_sync(spi, &message);
mutex_unlock(&max->io_mutex);
return ret;
}
/* Write a 16b word to the device */
static int max3110_out(struct uart_max3110 *max, const u16 out)
{
void *buf;
u16 *obuf, *ibuf;
int ret;
buf = kzalloc(8, GFP_KERNEL | GFP_DMA);
if (!buf)
return -ENOMEM;
obuf = buf;
ibuf = buf + 4;
*obuf = out;
ret = max3110_write_then_read(max, obuf, ibuf, 2, 1);
if (ret) {
pr_warn("%s: get err msg %d when sending 0x%x\n",
__func__, ret, out);
goto exit;
}
receive_chars(max, ibuf, 1);
exit:
kfree(buf);
return ret;
}
/*
* This is usually used to read data from SPIC RX FIFO, which doesn't
* need any delay like flushing character out.
*
* Return how many valide bytes are read back
*/
static int max3110_read_multi(struct uart_max3110 *max)
{
void *buf;
u16 *obuf, *ibuf;
int ret, blen;
blen = M3110_RX_FIFO_DEPTH * sizeof(u16);
buf = kzalloc(blen * 2, GFP_KERNEL | GFP_DMA);
if (!buf)
return 0;
/* tx/rx always have the same length */
obuf = buf;
ibuf = buf + blen;
if (max3110_write_then_read(max, obuf, ibuf, blen, 1)) {
kfree(buf);
return 0;
}
ret = receive_chars(max, ibuf, M3110_RX_FIFO_DEPTH);
kfree(buf);
return ret;
}
static void serial_m3110_con_putchar(struct uart_port *port, int ch)
{
struct uart_max3110 *max =
container_of(port, struct uart_max3110, port);
struct circ_buf *xmit = &max->con_xmit;
if (uart_circ_chars_free(xmit)) {
xmit->buf[xmit->head] = (char)ch;
xmit->head = (xmit->head + 1) & (PAGE_SIZE - 1);
}
}
/*
* Print a string to the serial port trying not to disturb
* any possible real use of the port...
*
* The console_lock must be held when we get here.
*/
static void serial_m3110_con_write(struct console *co,
const char *s, unsigned int count)
{
if (!pmax)
return;
uart_console_write(&pmax->port, s, count, serial_m3110_con_putchar);
if (!test_and_set_bit(CON_TX_NEEDED, &pmax->uart_flags))
wake_up(&pmax->wq);
}
static int __init
serial_m3110_con_setup(struct console *co, char *options)
{
struct uart_max3110 *max = pmax;
int baud = 115200;
int bits = 8;
int parity = 'n';
int flow = 'n';
pr_info("setting up console\n");
if (co->index == -1)
co->index = 0;
if (!max) {
pr_err("pmax is NULL, return\n");
return -ENODEV;
}
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
return uart_set_options(&max->port, co, baud, parity, bits, flow);
}
static struct tty_driver *serial_m3110_con_device(struct console *co,
int *index)
{
struct uart_driver *p = co->data;
*index = co->index;
return p->tty_driver;
}
static struct uart_driver serial_m3110_reg;
static struct console serial_m3110_console = {
.name = "ttyS",
.write = serial_m3110_con_write,
.device = serial_m3110_con_device,
.setup = serial_m3110_con_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &serial_m3110_reg,
};
static unsigned int serial_m3110_tx_empty(struct uart_port *port)
{
return 1;
}
static void serial_m3110_stop_tx(struct uart_port *port)
{
return;
}
/* stop_rx will be called in spin_lock env */
static void serial_m3110_stop_rx(struct uart_port *port)
{
return;
}
#define WORDS_PER_XFER 128
static void send_circ_buf(struct uart_max3110 *max,
struct circ_buf *xmit)
{
void *buf;
u16 *obuf, *ibuf;
int i, len, blen, dma_size, left, ret = 0;
dma_size = WORDS_PER_XFER * sizeof(u16) * 2;
buf = kzalloc(dma_size, GFP_KERNEL | GFP_DMA);
if (!buf)
return;
obuf = buf;
ibuf = buf + dma_size/2;
while (!uart_circ_empty(xmit)) {
left = uart_circ_chars_pending(xmit);
while (left) {
len = min(left, WORDS_PER_XFER);
blen = len * sizeof(u16);
memset(ibuf, 0, blen);
for (i = 0; i < len; i++) {
obuf[i] = (u8)xmit->buf[xmit->tail] | WD_TAG;
xmit->tail = (xmit->tail + 1) &
(UART_XMIT_SIZE - 1);
}
/* Fail to send msg to console is not very critical */
ret = max3110_write_then_read(max, obuf, ibuf, blen, 0);
if (ret)
pr_warn("%s: get err msg %d\n", __func__, ret);
receive_chars(max, ibuf, len);
max->port.icount.tx += len;
left -= len;
}
}
kfree(buf);
}
static void transmit_char(struct uart_max3110 *max)
{
struct uart_port *port = &max->port;
struct circ_buf *xmit = &port->state->xmit;
if (uart_circ_empty(xmit) || uart_tx_stopped(port))
return;
send_circ_buf(max, xmit);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (uart_circ_empty(xmit))
serial_m3110_stop_tx(port);
}
/*
* This will be called by uart_write() and tty_write, can't
* go to sleep
*/
static void serial_m3110_start_tx(struct uart_port *port)
{
struct uart_max3110 *max =
container_of(port, struct uart_max3110, port);
if (!test_and_set_bit(UART_TX_NEEDED, &max->uart_flags))
wake_up(&max->wq);
}
static int
receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
{
struct uart_port *port = &max->port;
struct tty_port *tport;
char buf[M3110_RX_FIFO_DEPTH];
int r, w, usable;
/* If uart is not opened, just return */
if (!port->state)
return 0;
tport = &port->state->port;
for (r = 0, w = 0; r < len; r++) {
if (str[r] & MAX3110_BREAK &&
uart_handle_break(port))
continue;
if (str[r] & MAX3110_READ_DATA_AVAILABLE) {
if (uart_handle_sysrq_char(port, str[r] & 0xff))
continue;
buf[w++] = str[r] & 0xff;
}
}
if (!w)
return 0;
for (r = 0; w; r += usable, w -= usable) {
usable = tty_buffer_request_room(tport, w);
if (usable) {
tty_insert_flip_string(tport, buf + r, usable);
port->icount.rx += usable;
}
}
tty_flip_buffer_push(tport);
return r;
}
/*
* This routine will be used in read_thread or RX IRQ handling,
* it will first do one round buffer read(8 words), if there is some
* valid RX data, will try to read 5 more rounds till all data
* is read out.
*
* Use stack space as data buffer to save some system load, and chose
* 504 Btyes as a threadhold to do a bulk push to upper tty layer when
* receiving bulk data, a much bigger buffer may cause stack overflow
*/
static void max3110_con_receive(struct uart_max3110 *max)
{
int loop = 1, num;
do {
num = max3110_read_multi(max);
if (num) {
loop = 5;
}
} while (--loop);
}
static int max3110_main_thread(void *_max)
{
struct uart_max3110 *max = _max;
wait_queue_head_t *wq = &max->wq;
int ret = 0;
struct circ_buf *xmit = &max->con_xmit;
pr_info("start main thread\n");
do {
wait_event_interruptible(*wq,
max->uart_flags || kthread_should_stop());
mutex_lock(&max->thread_mutex);
if (test_and_clear_bit(BIT_IRQ_PENDING, &max->uart_flags))
max3110_con_receive(max);
/* first handle console output */
if (test_and_clear_bit(CON_TX_NEEDED, &max->uart_flags))
send_circ_buf(max, xmit);
/* handle uart output */
if (test_and_clear_bit(UART_TX_NEEDED, &max->uart_flags))
transmit_char(max);
mutex_unlock(&max->thread_mutex);
} while (!kthread_should_stop());
return ret;
}
static irqreturn_t serial_m3110_irq(int irq, void *dev_id)
{
struct uart_max3110 *max = dev_id;
/* max3110's irq is a falling edge, not level triggered,
* so no need to disable the irq */
if (!test_and_set_bit(BIT_IRQ_PENDING, &max->uart_flags))
wake_up(&max->wq);
return IRQ_HANDLED;
}
/* if don't use RX IRQ, then need a thread to polling read */
static int max3110_read_thread(void *_max)
{
struct uart_max3110 *max = _max;
pr_info("start read thread\n");
do {
/*
* If can't acquire the mutex, it means the main thread
* is running which will also perform the rx job
*/
if (mutex_trylock(&max->thread_mutex)) {
max3110_con_receive(max);
mutex_unlock(&max->thread_mutex);
}
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(HZ / 20);
} while (!kthread_should_stop());
return 0;
}
static int serial_m3110_startup(struct uart_port *port)
{
struct uart_max3110 *max =
container_of(port, struct uart_max3110, port);
u16 config = 0;
int ret = 0;
if (port->line != 0) {
pr_err("uart port startup failed\n");
return -1;
}
/* Disable all IRQ and config it to 115200, 8n1 */
config = WC_TAG | WC_FIFO_ENABLE
| WC_1_STOPBITS
| WC_8BIT_WORD
| WC_BAUD_DR2;
/* as we use thread to handle tx/rx, need set low latency */
port->state->port.low_latency = 1;
if (max->irq) {
/* Enable RX IRQ only */
config |= WC_RXA_IRQ_ENABLE;
} else {
/* If IRQ is disabled, start a read thread for input data */
max->read_thread =
kthread_run(max3110_read_thread, max, "max3110_read");
if (IS_ERR(max->read_thread)) {
ret = PTR_ERR(max->read_thread);
max->read_thread = NULL;
pr_err("Can't create read thread!\n");
return ret;
}
}
ret = max3110_out(max, config);
if (ret) {
if (max->read_thread)
kthread_stop(max->read_thread);
max->read_thread = NULL;
return ret;
}
max->cur_conf = config;
return 0;
}
static void serial_m3110_shutdown(struct uart_port *port)
{
struct uart_max3110 *max =
container_of(port, struct uart_max3110, port);
u16 config;
if (max->read_thread) {
kthread_stop(max->read_thread);
max->read_thread = NULL;
}
/* Disable interrupts from this port */
config = WC_TAG | WC_SW_SHDI;
max3110_out(max, config);
}
static void serial_m3110_release_port(struct uart_port *port)
{
}
static int serial_m3110_request_port(struct uart_port *port)
{
return 0;
}
static void serial_m3110_config_port(struct uart_port *port, int flags)
{
port->type = PORT_MAX3100;
}
static int
serial_m3110_verify_port(struct uart_port *port, struct serial_struct *ser)
{
/* we don't want the core code to modify any port params */
return -EINVAL;
}
static const char *serial_m3110_type(struct uart_port *port)
{
struct uart_max3110 *max =
container_of(port, struct uart_max3110, port);
return max->name;
}
static void
serial_m3110_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
struct uart_max3110 *max =
container_of(port, struct uart_max3110, port);
unsigned char cval;
unsigned int baud, parity = 0;
int clk_div = -1;
u16 new_conf = max->cur_conf;
switch (termios->c_cflag & CSIZE) {
case CS7:
cval = UART_LCR_WLEN7;
new_conf |= WC_7BIT_WORD;
break;
default:
/* We only support CS7 & CS8 */
termios->c_cflag &= ~CSIZE;
termios->c_cflag |= CS8;
case CS8:
cval = UART_LCR_WLEN8;
new_conf |= WC_8BIT_WORD;
break;
}
baud = uart_get_baud_rate(port, termios, old, 0, 230400);
/* First calc the div for 1.8MHZ clock case */
switch (baud) {
case 300:
clk_div = WC_BAUD_DR384;
break;
case 600:
clk_div = WC_BAUD_DR192;
break;
case 1200:
clk_div = WC_BAUD_DR96;
break;
case 2400:
clk_div = WC_BAUD_DR48;
break;
case 4800:
clk_div = WC_BAUD_DR24;
break;
case 9600:
clk_div = WC_BAUD_DR12;
break;
case 19200:
clk_div = WC_BAUD_DR6;
break;
case 38400:
clk_div = WC_BAUD_DR3;
break;
case 57600:
clk_div = WC_BAUD_DR2;
break;
case 115200:
clk_div = WC_BAUD_DR1;
break;
case 230400:
if (max->clock & MAX3110_HIGH_CLK)
break;
default:
/* Pick the previous baud rate */
baud = max->baud;
clk_div = max->cur_conf & WC_BAUD_DIV_MASK;
tty_termios_encode_baud_rate(termios, baud, baud);
}
if (max->clock & MAX3110_HIGH_CLK) {
clk_div += 1;
/* High clk version max3110 doesn't support B300 */
if (baud == 300) {
baud = 600;
clk_div = WC_BAUD_DR384;
}
if (baud == 230400)
clk_div = WC_BAUD_DR1;
tty_termios_encode_baud_rate(termios, baud, baud);
}
new_conf = (new_conf & ~WC_BAUD_DIV_MASK) | clk_div;
if (unlikely(termios->c_cflag & CMSPAR))
termios->c_cflag &= ~CMSPAR;
if (termios->c_cflag & CSTOPB)
new_conf |= WC_2_STOPBITS;
else
new_conf &= ~WC_2_STOPBITS;
if (termios->c_cflag & PARENB) {
new_conf |= WC_PARITY_ENABLE;
parity |= UART_LCR_PARITY;
} else
new_conf &= ~WC_PARITY_ENABLE;
if (!(termios->c_cflag & PARODD))
parity |= UART_LCR_EPAR;
max->parity = parity;
uart_update_timeout(port, termios->c_cflag, baud);
new_conf |= WC_TAG;
if (new_conf != max->cur_conf) {
if (!max3110_out(max, new_conf)) {
max->cur_conf = new_conf;
max->baud = baud;
}
}
}
/* Don't handle hw handshaking */
static unsigned int serial_m3110_get_mctrl(struct uart_port *port)
{
return TIOCM_DSR | TIOCM_CAR | TIOCM_DSR;
}
static void serial_m3110_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
}
static void serial_m3110_break_ctl(struct uart_port *port, int break_state)
{
}
static void serial_m3110_pm(struct uart_port *port, unsigned int state,
unsigned int oldstate)
{
}
static struct uart_ops serial_m3110_ops = {
.tx_empty = serial_m3110_tx_empty,
.set_mctrl = serial_m3110_set_mctrl,
.get_mctrl = serial_m3110_get_mctrl,
.stop_tx = serial_m3110_stop_tx,
.start_tx = serial_m3110_start_tx,
.stop_rx = serial_m3110_stop_rx,
.break_ctl = serial_m3110_break_ctl,
.startup = serial_m3110_startup,
.shutdown = serial_m3110_shutdown,
.set_termios = serial_m3110_set_termios,
.pm = serial_m3110_pm,
.type = serial_m3110_type,
.release_port = serial_m3110_release_port,
.request_port = serial_m3110_request_port,
.config_port = serial_m3110_config_port,
.verify_port = serial_m3110_verify_port,
};
static struct uart_driver serial_m3110_reg = {
.owner = THIS_MODULE,
.driver_name = "MRST serial",
.dev_name = "ttyS",
.major = TTY_MAJOR,
.minor = 64,
.nr = 1,
.cons = &serial_m3110_console,
};
#ifdef CONFIG_PM_SLEEP
static int serial_m3110_suspend(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
struct uart_max3110 *max = spi_get_drvdata(spi);
if (max->irq > 0)
disable_irq(max->irq);
uart_suspend_port(&serial_m3110_reg, &max->port);
max3110_out(max, max->cur_conf | WC_SW_SHDI);
return 0;
}
static int serial_m3110_resume(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
struct uart_max3110 *max = spi_get_drvdata(spi);
max3110_out(max, max->cur_conf);
uart_resume_port(&serial_m3110_reg, &max->port);
if (max->irq > 0)
enable_irq(max->irq);
return 0;
}
static SIMPLE_DEV_PM_OPS(serial_m3110_pm_ops, serial_m3110_suspend,
serial_m3110_resume);
#define SERIAL_M3110_PM_OPS (&serial_m3110_pm_ops)
#else
#define SERIAL_M3110_PM_OPS NULL
#endif
static int serial_m3110_probe(struct spi_device *spi)
{
struct uart_max3110 *max;
void *buffer;
u16 res;
int ret = 0;
max = kzalloc(sizeof(*max), GFP_KERNEL);
if (!max)
return -ENOMEM;
/* Set spi info */
spi->bits_per_word = 16;
max->clock = MAX3110_HIGH_CLK;
spi_setup(spi);
max->port.type = PORT_MAX3100;
max->port.fifosize = 2; /* Only have 16b buffer */
max->port.ops = &serial_m3110_ops;
max->port.line = 0;
max->port.dev = &spi->dev;
max->port.uartclk = 115200;
max->spi = spi;
strcpy(max->name, spi->modalias);
max->irq = (u16)spi->irq;
mutex_init(&max->thread_mutex);
mutex_init(&max->io_mutex);
max->word_7bits = 0;
max->parity = 0;
max->baud = 0;
max->cur_conf = 0;
max->uart_flags = 0;
/* Check if reading configuration register returns something sane */
res = RC_TAG;
ret = max3110_write_then_read(max, (u8 *)&res, (u8 *)&res, 2, 0);
if (ret < 0 || res == 0 || res == 0xffff) {
dev_dbg(&spi->dev, "MAX3111 deemed not present (conf reg %04x)",
res);
ret = -ENODEV;
goto err_get_page;
}
buffer = (void *)__get_free_page(GFP_KERNEL);
if (!buffer) {
ret = -ENOMEM;
goto err_get_page;
}
max->con_xmit.buf = buffer;
max->con_xmit.head = 0;
max->con_xmit.tail = 0;
init_waitqueue_head(&max->wq);
max->main_thread = kthread_run(max3110_main_thread,
max, "max3110_main");
if (IS_ERR(max->main_thread)) {
ret = PTR_ERR(max->main_thread);
goto err_kthread;
}
if (max->irq) {
ret = request_irq(max->irq, serial_m3110_irq,
IRQ_TYPE_EDGE_FALLING, "max3110", max);
if (ret) {
max->irq = 0;
dev_warn(&spi->dev,
"unable to allocate IRQ, will use polling method\n");
}
}
spi_set_drvdata(spi, max);
pmax = max;
/* Give membase a psudo value to pass serial_core's check */
max->port.membase = (unsigned char __iomem *)0xff110000;
uart_add_one_port(&serial_m3110_reg, &max->port);
return 0;
err_kthread:
free_page((unsigned long)buffer);
err_get_page:
kfree(max);
return ret;
}
static int serial_m3110_remove(struct spi_device *dev)
{
struct uart_max3110 *max = spi_get_drvdata(dev);
if (!max)
return 0;
uart_remove_one_port(&serial_m3110_reg, &max->port);
free_page((unsigned long)max->con_xmit.buf);
if (max->irq)
free_irq(max->irq, max);
if (max->main_thread)
kthread_stop(max->main_thread);
kfree(max);
return 0;
}
static struct spi_driver uart_max3110_driver = {
.driver = {
.name = "spi_max3111",
.owner = THIS_MODULE,
.pm = SERIAL_M3110_PM_OPS,
},
.probe = serial_m3110_probe,
.remove = serial_m3110_remove,
};
static int __init serial_m3110_init(void)
{
int ret = 0;
ret = uart_register_driver(&serial_m3110_reg);
if (ret)
return ret;
ret = spi_register_driver(&uart_max3110_driver);
if (ret)
uart_unregister_driver(&serial_m3110_reg);
return ret;
}
static void __exit serial_m3110_exit(void)
{
spi_unregister_driver(&uart_max3110_driver);
uart_unregister_driver(&serial_m3110_reg);
}
module_init(serial_m3110_init);
module_exit(serial_m3110_exit);
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:max3110-uart");

View File

@ -1,61 +0,0 @@
#ifndef _MRST_MAX3110_H
#define _MRST_MAX3110_H
#define MAX3110_HIGH_CLK 0x1 /* 3.6864 MHZ */
#define MAX3110_LOW_CLK 0x0 /* 1.8432 MHZ */
/* status bits for all 4 MAX3110 operate modes */
#define MAX3110_READ_DATA_AVAILABLE (1 << 15)
#define MAX3110_WRITE_BUF_EMPTY (1 << 14)
#define MAX3110_BREAK (1 << 10)
#define WC_TAG (3 << 14)
#define RC_TAG (1 << 14)
#define WD_TAG (2 << 14)
#define RD_TAG (0 << 14)
/* bits def for write configuration */
#define WC_FIFO_ENABLE_MASK (1 << 13)
#define WC_FIFO_ENABLE (0 << 13)
#define WC_SW_SHDI (1 << 12)
#define WC_IRQ_MASK (0xF << 8)
#define WC_TXE_IRQ_ENABLE (1 << 11) /* TX empty irq */
#define WC_RXA_IRQ_ENABLE (1 << 10) /* RX available irq */
#define WC_PAR_HIGH_IRQ_ENABLE (1 << 9)
#define WC_REC_ACT_IRQ_ENABLE (1 << 8)
#define WC_IRDA_ENABLE (1 << 7)
#define WC_STOPBITS_MASK (1 << 6)
#define WC_2_STOPBITS (1 << 6)
#define WC_1_STOPBITS (0 << 6)
#define WC_PARITY_ENABLE_MASK (1 << 5)
#define WC_PARITY_ENABLE (1 << 5)
#define WC_WORDLEN_MASK (1 << 4)
#define WC_7BIT_WORD (1 << 4)
#define WC_8BIT_WORD (0 << 4)
#define WC_BAUD_DIV_MASK (0xF)
#define WC_BAUD_DR1 (0x0)
#define WC_BAUD_DR2 (0x1)
#define WC_BAUD_DR4 (0x2)
#define WC_BAUD_DR8 (0x3)
#define WC_BAUD_DR16 (0x4)
#define WC_BAUD_DR32 (0x5)
#define WC_BAUD_DR64 (0x6)
#define WC_BAUD_DR128 (0x7)
#define WC_BAUD_DR3 (0x8)
#define WC_BAUD_DR6 (0x9)
#define WC_BAUD_DR12 (0xA)
#define WC_BAUD_DR24 (0xB)
#define WC_BAUD_DR48 (0xC)
#define WC_BAUD_DR96 (0xD)
#define WC_BAUD_DR192 (0xE)
#define WC_BAUD_DR384 (0xF)
#define M3110_RX_FIFO_DEPTH 8
#endif