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![Tom Rini](/assets/img/avatar_default.png)
The sandburst-specific i2c drivers have been deleted, conflict was just over the SPDX conversion. Conflicts: board/sandburst/common/ppc440gx_i2c.c board/sandburst/common/ppc440gx_i2c.h Signed-off-by: Tom Rini <trini@ti.com>
491 lines
14 KiB
C
491 lines
14 KiB
C
/*
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* (C) Copyright 2007
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* Stefan Roese, DENX Software Engineering, sr@denx.de.
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*
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* (C) Copyright 2001, 2002
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* DENX Software Engineering
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* Wolfgang Denk, wd@denx.de
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/* define DEBUG for debugging output (obviously ;-)) */
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#if 0
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#define DEBUG
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#endif
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#include <common.h>
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#include <i2c.h>
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#include <command.h>
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#include <post.h>
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#include <serial.h>
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#include <malloc.h>
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#include <linux/types.h>
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#include <linux/string.h> /* for strdup */
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DECLARE_GLOBAL_DATA_PTR;
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static void kbd_init (void);
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static int compare_magic (uchar *kbd_data, uchar *str);
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/*--------------------- Local macros and constants --------------------*/
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#define _NOT_USED_ 0xFFFFFFFF
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/*------------------------- dspic io expander -----------------------*/
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#define DSPIC_PON_STATUS_REG 0x80A
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#define DSPIC_PON_INV_STATUS_REG 0x80C
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#define DSPIC_PON_KEY_REG 0x810
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/*------------------------- Keyboard controller -----------------------*/
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/* command codes */
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#define KEYBD_CMD_READ_KEYS 0x01
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#define KEYBD_CMD_READ_VERSION 0x02
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#define KEYBD_CMD_READ_STATUS 0x03
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#define KEYBD_CMD_RESET_ERRORS 0x10
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/* status codes */
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#define KEYBD_STATUS_MASK 0x3F
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#define KEYBD_STATUS_H_RESET 0x20
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#define KEYBD_STATUS_BROWNOUT 0x10
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#define KEYBD_STATUS_WD_RESET 0x08
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#define KEYBD_STATUS_OVERLOAD 0x04
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#define KEYBD_STATUS_ILLEGAL_WR 0x02
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#define KEYBD_STATUS_ILLEGAL_RD 0x01
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/* Number of bytes returned from Keyboard Controller */
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#define KEYBD_VERSIONLEN 2 /* version information */
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/*
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* This is different from the "old" lwmon dsPIC kbd controller
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* implementation. Now the controller still answers with 9 bytes,
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* but the last 3 bytes are always "0x06 0x07 0x08". So we just
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* set the length to compare to 6 instead of 9.
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*/
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#define KEYBD_DATALEN 6 /* normal key scan data */
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/* maximum number of "magic" key codes that can be assigned */
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static uchar kbd_addr = CONFIG_SYS_I2C_KEYBD_ADDR;
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static uchar dspic_addr = CONFIG_SYS_I2C_DSPIC_IO_ADDR;
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static uchar *key_match (uchar *);
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#define KEYBD_SET_DEBUGMODE '#' /* Magic key to enable debug output */
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/***********************************************************************
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F* Function: int board_postclk_init (void) P*A*Z*
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*
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P* Parameters: none
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P*
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P* Returnvalue: int
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P* - 0 is always returned.
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*
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Z* Intention: This function is the board_postclk_init() method implementation
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Z* for the lwmon board.
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*
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***********************************************************************/
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int board_postclk_init (void)
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{
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kbd_init();
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return (0);
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}
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static void kbd_init (void)
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{
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uchar kbd_data[KEYBD_DATALEN];
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uchar tmp_data[KEYBD_DATALEN];
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uchar val, errcd;
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int i;
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i2c_set_bus_num(0);
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gd->arch.kbd_status = 0;
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/* Forced by PIC. Delays <= 175us loose */
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udelay(1000);
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/* Read initial keyboard error code */
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val = KEYBD_CMD_READ_STATUS;
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i2c_write (kbd_addr, 0, 0, &val, 1);
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i2c_read (kbd_addr, 0, 0, &errcd, 1);
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/* clear unused bits */
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errcd &= KEYBD_STATUS_MASK;
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/* clear "irrelevant" bits. Recommended by Martin Rajek, LWN */
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errcd &= ~(KEYBD_STATUS_H_RESET|KEYBD_STATUS_BROWNOUT);
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if (errcd) {
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gd->arch.kbd_status |= errcd << 8;
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}
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/* Reset error code and verify */
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val = KEYBD_CMD_RESET_ERRORS;
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i2c_write (kbd_addr, 0, 0, &val, 1);
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udelay(1000); /* delay NEEDED by keyboard PIC !!! */
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val = KEYBD_CMD_READ_STATUS;
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i2c_write (kbd_addr, 0, 0, &val, 1);
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i2c_read (kbd_addr, 0, 0, &val, 1);
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val &= KEYBD_STATUS_MASK; /* clear unused bits */
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if (val) { /* permanent error, report it */
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gd->arch.kbd_status |= val;
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return;
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}
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/*
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* Read current keyboard state.
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*
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* After the error reset it may take some time before the
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* keyboard PIC picks up a valid keyboard scan - the total
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* scan time is approx. 1.6 ms (information by Martin Rajek,
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* 28 Sep 2002). We read a couple of times for the keyboard
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* to stabilize, using a big enough delay.
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* 10 times should be enough. If the data is still changing,
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* we use what we get :-(
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*/
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memset (tmp_data, 0xFF, KEYBD_DATALEN); /* impossible value */
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for (i=0; i<10; ++i) {
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val = KEYBD_CMD_READ_KEYS;
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i2c_write (kbd_addr, 0, 0, &val, 1);
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i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);
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if (memcmp(kbd_data, tmp_data, KEYBD_DATALEN) == 0) {
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/* consistent state, done */
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break;
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}
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/* remeber last state, delay, and retry */
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memcpy (tmp_data, kbd_data, KEYBD_DATALEN);
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udelay (5000);
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}
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}
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/* Read a register from the dsPIC. */
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int _dspic_read(ushort reg, ushort *data)
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{
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uchar buf[sizeof(*data)];
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int rval;
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if (i2c_read(dspic_addr, reg, 2, buf, 2))
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return -1;
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rval = i2c_read(dspic_addr, reg, sizeof(reg), buf, sizeof(*data));
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*data = (buf[0] << 8) | buf[1];
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return rval;
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}
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/***********************************************************************
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F* Function: int misc_init_r (void) P*A*Z*
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*
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P* Parameters: none
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P*
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P* Returnvalue: int
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P* - 0 is always returned, even in the case of a keyboard
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P* error.
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*
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Z* Intention: This function is the misc_init_r() method implementation
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Z* for the lwmon board.
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Z* The keyboard controller is initialized and the result
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Z* of a read copied to the environment variable "keybd".
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Z* If KEYBD_SET_DEBUGMODE is defined, a check is made for
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Z* this key, and if found display to the LCD will be enabled.
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Z* The keys in "keybd" are checked against the magic
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Z* keycommands defined in the environment.
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Z* See also key_match().
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*
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D* Design: wd@denx.de
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C* Coding: wd@denx.de
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V* Verification: dzu@denx.de
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***********************************************************************/
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int misc_init_r_kbd (void)
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{
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uchar kbd_data[KEYBD_DATALEN];
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char keybd_env[2 * KEYBD_DATALEN + 1];
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uchar kbd_init_status = gd->arch.kbd_status >> 8;
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uchar kbd_status = gd->arch.kbd_status;
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uchar val;
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ushort data, inv_data;
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char *str;
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int i;
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if (kbd_init_status) {
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printf ("KEYBD: Error %02X\n", kbd_init_status);
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}
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if (kbd_status) { /* permanent error, report it */
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printf ("*** Keyboard error code %02X ***\n", kbd_status);
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sprintf (keybd_env, "%02X", kbd_status);
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setenv ("keybd", keybd_env);
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return 0;
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}
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/*
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* Now we know that we have a working keyboard, so disable
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* all output to the LCD except when a key press is detected.
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*/
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if ((console_assign (stdout, "serial") < 0) ||
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(console_assign (stderr, "serial") < 0)) {
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printf ("Can't assign serial port as output device\n");
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}
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/* Read Version */
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val = KEYBD_CMD_READ_VERSION;
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i2c_write (kbd_addr, 0, 0, &val, 1);
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i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_VERSIONLEN);
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printf ("KEYBD: Version %d.%d\n", kbd_data[0], kbd_data[1]);
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/* Read current keyboard state */
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val = KEYBD_CMD_READ_KEYS;
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i2c_write (kbd_addr, 0, 0, &val, 1);
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i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);
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/* read out start key from bse01 received via can */
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_dspic_read(DSPIC_PON_STATUS_REG, &data);
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/* check highbyte from status register */
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if (data > 0xFF) {
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_dspic_read(DSPIC_PON_INV_STATUS_REG, &inv_data);
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/* check inverse data */
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if ((data+inv_data) == 0xFFFF) {
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/* don't overwrite local key */
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if (kbd_data[1] == 0) {
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/* read key value */
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_dspic_read(DSPIC_PON_KEY_REG, &data);
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str = (char *)&data;
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/* swap bytes */
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kbd_data[1] = str[1];
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kbd_data[2] = str[0];
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printf("CAN received startkey: 0x%X\n", data);
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}
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}
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}
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for (i = 0; i < KEYBD_DATALEN; ++i) {
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sprintf (keybd_env + i + i, "%02X", kbd_data[i]);
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}
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setenv ("keybd", keybd_env);
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str = strdup ((char *)key_match (kbd_data)); /* decode keys */
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#ifdef KEYBD_SET_DEBUGMODE
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if (kbd_data[0] == KEYBD_SET_DEBUGMODE) { /* set debug mode */
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if ((console_assign (stdout, "lcd") < 0) ||
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(console_assign (stderr, "lcd") < 0)) {
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printf ("Can't assign LCD display as output device\n");
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}
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}
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#endif /* KEYBD_SET_DEBUGMODE */
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#ifdef CONFIG_PREBOOT /* automatically configure "preboot" command on key match */
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setenv ("preboot", str); /* set or delete definition */
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#endif /* CONFIG_PREBOOT */
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if (str != NULL) {
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free (str);
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}
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return (0);
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}
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#ifdef CONFIG_PREBOOT
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static uchar kbd_magic_prefix[] = "key_magic";
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static uchar kbd_command_prefix[] = "key_cmd";
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static int compare_magic (uchar *kbd_data, uchar *str)
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{
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uchar compare[KEYBD_DATALEN-1];
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char *nxt;
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int i;
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/* Don't include modifier byte */
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memcpy (compare, kbd_data+1, KEYBD_DATALEN-1);
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for (; str != NULL; str = (*nxt) ? (uchar *)(nxt+1) : (uchar *)nxt) {
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uchar c;
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int k;
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c = (uchar) simple_strtoul ((char *)str, (char **) (&nxt), 16);
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if (str == (uchar *)nxt) { /* invalid character */
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break;
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}
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/*
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* Check if this key matches the input.
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* Set matches to zero, so they match only once
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* and we can find duplicates or extra keys
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*/
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for (k = 0; k < sizeof(compare); ++k) {
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if (compare[k] == '\0') /* only non-zero entries */
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continue;
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if (c == compare[k]) { /* found matching key */
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compare[k] = '\0';
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break;
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}
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}
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if (k == sizeof(compare)) {
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return -1; /* unmatched key */
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}
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}
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/*
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* A full match leaves no keys in the `compare' array,
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*/
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for (i = 0; i < sizeof(compare); ++i) {
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if (compare[i])
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{
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return -1;
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}
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}
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return 0;
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}
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/***********************************************************************
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F* Function: static uchar *key_match (uchar *kbd_data) P*A*Z*
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*
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P* Parameters: uchar *kbd_data
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P* - The keys to match against our magic definitions
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P*
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P* Returnvalue: uchar *
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P* - != NULL: Pointer to the corresponding command(s)
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P* NULL: No magic is about to happen
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*
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Z* Intention: Check if pressed key(s) match magic sequence,
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Z* and return the command string associated with that key(s).
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Z*
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Z* If no key press was decoded, NULL is returned.
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Z*
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Z* Note: the first character of the argument will be
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Z* overwritten with the "magic charcter code" of the
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Z* decoded key(s), or '\0'.
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Z*
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Z* Note: the string points to static environment data
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Z* and must be saved before you call any function that
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Z* modifies the environment.
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*
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D* Design: wd@denx.de
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C* Coding: wd@denx.de
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V* Verification: dzu@denx.de
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***********************************************************************/
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static uchar *key_match (uchar *kbd_data)
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{
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char magic[sizeof (kbd_magic_prefix) + 1];
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uchar *suffix;
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char *kbd_magic_keys;
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/*
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* The following string defines the characters that can pe appended
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* to "key_magic" to form the names of environment variables that
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* hold "magic" key codes, i. e. such key codes that can cause
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* pre-boot actions. If the string is empty (""), then only
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* "key_magic" is checked (old behaviour); the string "125" causes
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* checks for "key_magic1", "key_magic2" and "key_magic5", etc.
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*/
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if ((kbd_magic_keys = getenv ("magic_keys")) == NULL)
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kbd_magic_keys = "";
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/* loop over all magic keys;
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* use '\0' suffix in case of empty string
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*/
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for (suffix=(uchar *)kbd_magic_keys; *suffix || suffix==(uchar *)kbd_magic_keys; ++suffix) {
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sprintf (magic, "%s%c", kbd_magic_prefix, *suffix);
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debug ("### Check magic \"%s\"\n", magic);
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if (compare_magic(kbd_data, (uchar *)getenv(magic)) == 0) {
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char cmd_name[sizeof (kbd_command_prefix) + 1];
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char *cmd;
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sprintf (cmd_name, "%s%c", kbd_command_prefix, *suffix);
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cmd = getenv (cmd_name);
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debug ("### Set PREBOOT to $(%s): \"%s\"\n",
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cmd_name, cmd ? cmd : "<<NULL>>");
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*kbd_data = *suffix;
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return ((uchar *)cmd);
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}
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}
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debug ("### Delete PREBOOT\n");
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*kbd_data = '\0';
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return (NULL);
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}
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#endif /* CONFIG_PREBOOT */
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/***********************************************************************
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F* Function: int do_kbd (cmd_tbl_t *cmdtp, int flag,
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F* int argc, char * const argv[]) P*A*Z*
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*
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P* Parameters: cmd_tbl_t *cmdtp
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P* - Pointer to our command table entry
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P* int flag
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P* - If the CMD_FLAG_REPEAT bit is set, then this call is
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P* a repetition
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P* int argc
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P* - Argument count
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P* char * const argv[]
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P* - Array of the actual arguments
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P*
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P* Returnvalue: int
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P* - 0 is always returned.
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*
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Z* Intention: Implement the "kbd" command.
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Z* The keyboard status is read. The result is printed on
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Z* the console and written into the "keybd" environment
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Z* variable.
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*
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D* Design: wd@denx.de
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C* Coding: wd@denx.de
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V* Verification: dzu@denx.de
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***********************************************************************/
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int do_kbd (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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uchar kbd_data[KEYBD_DATALEN];
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char keybd_env[2 * KEYBD_DATALEN + 1];
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uchar val;
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int i;
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#if 0 /* Done in kbd_init */
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i2c_init (CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
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#endif
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/* Read keys */
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val = KEYBD_CMD_READ_KEYS;
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i2c_write (kbd_addr, 0, 0, &val, 1);
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i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);
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puts ("Keys:");
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for (i = 0; i < KEYBD_DATALEN; ++i) {
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sprintf (keybd_env + i + i, "%02X", kbd_data[i]);
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printf (" %02x", kbd_data[i]);
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}
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putc ('\n');
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setenv ("keybd", keybd_env);
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return 0;
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}
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U_BOOT_CMD(
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kbd, 1, 1, do_kbd,
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"read keyboard status",
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""
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);
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/*----------------------------- Utilities -----------------------------*/
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#ifdef CONFIG_POST
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/*
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* Returns 1 if keys pressed to start the power-on long-running tests
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* Called from board_init_f().
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*/
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int post_hotkeys_pressed(void)
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{
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uchar kbd_data[KEYBD_DATALEN];
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uchar val;
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/* Read keys */
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val = KEYBD_CMD_READ_KEYS;
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i2c_write (kbd_addr, 0, 0, &val, 1);
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i2c_read (kbd_addr, 0, 0, kbd_data, KEYBD_DATALEN);
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return (compare_magic(kbd_data, (uchar *)CONFIG_POST_KEY_MAGIC) == 0);
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}
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#endif
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