[ARM] 4506/1: HP Jornada 7XX: Addition of SSP Platform Driver
These patches add full SSP/MCU support for the HP Jornada 720 machine. Its needed to handle keyboard, touchscreen, battery and backlight/lcd. The main driver exports functions and the header file exports the command values. When talking to the MCU the general procedure is to start MCU, send command (using ssp_inout(command)), the proper reply is always TXDUMMY. After receiving TXDUMMY you can send the value you wish pushed (for example brightness level). End with ssp_end() so the spinlock gets unlocked. Drivers using this havent been implemented yet, but will shortly. Signed-off-by: Kristoffer Ericson <Kristoffer.ericson@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>hifive-unleashed-5.1
Kristoffer Ericson
Russell King
parent
7b4c965a0b
commit
69ebb22277
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@ -101,6 +101,16 @@ config SA1100_JORNADA720
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handheld computer. See <http://www.hp.com/jornada/products/720>
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for details.
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config SA1100_JORNADA720_SSP
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bool "HP Jornada 720 Extended SSP driver"
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select SA1100_SSP
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depends on SA1100_JORNADA720
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help
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Say Y here if you have a HP Jornada 7xx handheld computer and you
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want to access devices connected to the MCU. Those include the
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keyboard, touchscreen, backlight and battery. This driver also activates
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the generic SSP which it extends.
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config SA1100_HACKKIT
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bool "HackKit Core CPU Board"
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help
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@ -145,8 +155,7 @@ config SA1100_SSP
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help
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Say Y here to enable support for the generic PIO SSP driver.
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This isn't for audio support, but for attached sensors and
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other devices, eg for BadgePAD 4 sensor support, or Jornada
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720 touchscreen support.
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other devices, eg for BadgePAD 4 sensor support.
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config H3600_SLEEVE
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tristate "Compaq iPAQ Handheld sleeve support"
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@ -31,6 +31,7 @@ obj-$(CONFIG_SA1100_HACKKIT) += hackkit.o
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led-$(CONFIG_SA1100_HACKKIT) += leds-hackkit.o
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obj-$(CONFIG_SA1100_JORNADA720) += jornada720.o
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obj-$(CONFIG_SA1100_JORNADA720_SSP) += jornada720_ssp.o
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obj-$(CONFIG_SA1100_LART) += lart.o
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led-$(CONFIG_SA1100_LART) += leds-lart.o
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@ -51,3 +52,4 @@ obj-$(CONFIG_LEDS) += $(led-y)
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# Miscelaneous functions
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obj-$(CONFIG_PM) += pm.o sleep.o
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obj-$(CONFIG_SA1100_SSP) += ssp.o
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@ -0,0 +1,201 @@
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/**
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* arch/arm/mac-sa1100/jornada720_ssp.c
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*
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* Copyright (C) 2006/2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
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* Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* SSP driver for the HP Jornada 710/720/728
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*/
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <asm/hardware.h>
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#include <asm/hardware/ssp.h>
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#include <asm/arch/jornada720.h>
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static DEFINE_SPINLOCK(jornada_ssp_lock);
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static unsigned long jornada_ssp_flags;
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/**
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* jornada_ssp_reverse - reverses input byte
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*
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* we need to reverse all data we recieve from the mcu due to its physical location
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* returns : 01110111 -> 11101110
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*/
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u8 inline jornada_ssp_reverse(u8 byte)
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{
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return
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((0x80 & byte) >> 7) |
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((0x40 & byte) >> 5) |
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((0x20 & byte) >> 3) |
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((0x10 & byte) >> 1) |
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((0x08 & byte) << 1) |
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((0x04 & byte) << 3) |
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((0x02 & byte) << 5) |
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((0x01 & byte) << 7);
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};
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EXPORT_SYMBOL(jornada_ssp_reverse);
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/**
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* jornada_ssp_byte - waits for ready ssp bus and sends byte
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*
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* waits for fifo buffer to clear and then transmits, if it doesn't then we will
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* timeout after <timeout> rounds. Needs mcu running before its called.
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*
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* returns : %mcu output on success
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* : %-ETIMEOUT on timeout
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*/
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int jornada_ssp_byte(u8 byte)
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{
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int timeout = 400000;
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u16 ret;
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while ((GPLR & GPIO_GPIO10)) {
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if (!--timeout) {
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printk(KERN_WARNING "SSP: timeout while waiting for transmit\n");
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return -ETIMEDOUT;
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}
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cpu_relax();
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}
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ret = jornada_ssp_reverse(byte) << 8;
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ssp_write_word(ret);
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ssp_read_word(&ret);
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return jornada_ssp_reverse(ret);
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};
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EXPORT_SYMBOL(jornada_ssp_byte);
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/**
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* jornada_ssp_inout - decide if input is command or trading byte
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*
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* returns : (jornada_ssp_byte(byte)) on success
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* : %-ETIMEOUT on timeout failure
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*/
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int jornada_ssp_inout(u8 byte)
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{
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int ret, i;
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/* true means command byte */
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if (byte != TXDUMMY) {
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ret = jornada_ssp_byte(byte);
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/* Proper return to commands is TxDummy */
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if (ret != TXDUMMY) {
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for (i = 0; i < 256; i++)/* flushing bus */
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if (jornada_ssp_byte(TXDUMMY) == -1)
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break;
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return -ETIMEDOUT;
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}
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} else /* Exchange TxDummy for data */
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ret = jornada_ssp_byte(TXDUMMY);
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return ret;
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};
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EXPORT_SYMBOL(jornada_ssp_inout);
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/**
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* jornada_ssp_start - enable mcu
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*
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*/
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int jornada_ssp_start()
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{
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spin_lock_irqsave(&jornada_ssp_lock, jornada_ssp_flags);
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GPCR = GPIO_GPIO25;
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udelay(50);
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return 0;
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};
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EXPORT_SYMBOL(jornada_ssp_start);
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/**
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* jornada_ssp_end - disable mcu and turn off lock
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*
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*/
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int jornada_ssp_end()
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{
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GPSR = GPIO_GPIO25;
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spin_unlock_irqrestore(&jornada_ssp_lock, jornada_ssp_flags);
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return 0;
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};
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EXPORT_SYMBOL(jornada_ssp_end);
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static int __init jornada_ssp_probe(struct platform_device *dev)
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{
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int ret;
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GPSR = GPIO_GPIO25;
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ret = ssp_init();
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/* worked fine, lets not bother with anything else */
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if (!ret) {
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printk(KERN_INFO "SSP: device initialized with irq\n");
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return ret;
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}
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printk(KERN_WARNING "SSP: initialization failed, trying non-irq solution \n");
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/* init of Serial 4 port */
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Ser4MCCR0 = 0;
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Ser4SSCR0 = 0x0387;
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Ser4SSCR1 = 0x18;
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/* clear out any left over data */
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ssp_flush();
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/* enable MCU */
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jornada_ssp_start();
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/* see if return value makes sense */
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ret = jornada_ssp_inout(GETBRIGHTNESS);
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/* seems like it worked, just feed it with TxDummy to get rid of data */
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if (ret == TxDummy)
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jornada_ssp_inout(TXDUMMY);
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jornada_ssp_end();
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/* failed, lets just kill everything */
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if (ret == -ETIMEDOUT) {
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printk(KERN_WARNING "SSP: attempts failed, bailing\n");
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ssp_exit();
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return -ENODEV;
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}
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/* all fine */
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printk(KERN_INFO "SSP: device initialized\n");
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return 0;
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};
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static int jornada_ssp_remove(struct platform_device *dev)
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{
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/* Note that this doesnt actually remove the driver, since theres nothing to remove
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* It just makes sure everything is turned off */
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GPSR = GPIO_GPIO25;
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ssp_exit();
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return 0;
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};
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struct platform_driver jornadassp_driver = {
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.probe = jornada_ssp_probe,
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.remove = jornada_ssp_remove,
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.driver = {
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.name = "jornada_ssp",
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},
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};
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static int __init jornada_ssp_init(void)
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{
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return platform_driver_register(&jornadassp_driver);
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}
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@ -0,0 +1,27 @@
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/*
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* include/asm-arm/arch-sa1100/jornada720.h
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*
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* This file contains SSP/MCU communication definitions for HP Jornada 710/720/728
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*
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* Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
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* Copyright (C) 2000 John Ankcorn <jca@lcs.mit.edu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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/* HP Jornada 7xx microprocessor commands */
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#define GETBATTERYDATA 0xc0
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#define GETSCANKEYCODE 0x90
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#define GETTOUCHSAMPLES 0xa0
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#define GETCONTRAST 0xD0
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#define SETCONTRAST 0xD1
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#define GETBRIGHTNESS 0xD2
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#define SETBRIGHTNESS 0xD3
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#define CONTRASTOFF 0xD8
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#define BRIGHTNESSOFF 0xD9
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#define PWMOFF 0xDF
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#define TXDUMMY 0x11
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#define ERRORCODE 0x00
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