Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Support for the OLPC DCON and OLPC EC access
 *
 * Copyright © 2006  Advanced Micro Devices, Inc.
 * Copyright © 2007-2008  Andres Salomon <dilinger@debian.org>
 */
 
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/string.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/syscore_ops.h>
#include <linux/mutex.h>
#include <linux/olpc-ec.h>
 
#include <asm/geode.h>
#include <asm/setup.h>
#include <asm/olpc.h>
#include <asm/olpc_ofw.h>
 
struct olpc_platform_t olpc_platform_info;
EXPORT_SYMBOL_GPL(olpc_platform_info);
 
/* what the timeout *should* be (in ms) */
#define EC_BASE_TIMEOUT 20
 
/* the timeout that bugs in the EC might force us to actually use */
static int ec_timeout = EC_BASE_TIMEOUT;
 
static int __init olpc_ec_timeout_set(char *str)
{
<------>if (get_option(&str, &ec_timeout) != 1) {
<------><------>ec_timeout = EC_BASE_TIMEOUT;
<------><------>printk(KERN_ERR "olpc-ec:  invalid argument to "
<------><------><------><------>"'olpc_ec_timeout=', ignoring!\n");
<------>}
<------>printk(KERN_DEBUG "olpc-ec:  using %d ms delay for EC commands.\n",
<------><------><------>ec_timeout);
<------>return 1;
}
__setup("olpc_ec_timeout=", olpc_ec_timeout_set);
 
/*
 * These {i,o}bf_status functions return whether the buffers are full or not.
 */
 
static inline unsigned int ibf_status(unsigned int port)
{
<------>return !!(inb(port) & 0x02);
}
 
static inline unsigned int obf_status(unsigned int port)
{
<------>return inb(port) & 0x01;
}
 
#define wait_on_ibf(p, d) __wait_on_ibf(__LINE__, (p), (d))
static int __wait_on_ibf(unsigned int line, unsigned int port, int desired)
{
<------>unsigned int timeo;
<------>int state = ibf_status(port);
 
<------>for (timeo = ec_timeout; state != desired && timeo; timeo--) {
<------><------>mdelay(1);
<------><------>state = ibf_status(port);
<------>}
 
<------>if ((state == desired) && (ec_timeout > EC_BASE_TIMEOUT) &&
<------><------><------>timeo < (ec_timeout - EC_BASE_TIMEOUT)) {
<------><------>printk(KERN_WARNING "olpc-ec:  %d: waited %u ms for IBF!\n",
<------><------><------><------>line, ec_timeout - timeo);
<------>}
 
<------>return !(state == desired);
}
 
#define wait_on_obf(p, d) __wait_on_obf(__LINE__, (p), (d))
static int __wait_on_obf(unsigned int line, unsigned int port, int desired)
{
<------>unsigned int timeo;
<------>int state = obf_status(port);
 
<------>for (timeo = ec_timeout; state != desired && timeo; timeo--) {
<------><------>mdelay(1);
<------><------>state = obf_status(port);
<------>}
 
<------>if ((state == desired) && (ec_timeout > EC_BASE_TIMEOUT) &&
<------><------><------>timeo < (ec_timeout - EC_BASE_TIMEOUT)) {
<------><------>printk(KERN_WARNING "olpc-ec:  %d: waited %u ms for OBF!\n",
<------><------><------><------>line, ec_timeout - timeo);
<------>}
 
<------>return !(state == desired);
}
 
/*
 * This allows the kernel to run Embedded Controller commands.  The EC is
 * documented at <http://wiki.laptop.org/go/Embedded_controller>, and the
 * available EC commands are here:
 * <http://wiki.laptop.org/go/Ec_specification>.  Unfortunately, while
 * OpenFirmware's source is available, the EC's is not.
 */
static int olpc_xo1_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf,
<------><------>size_t outlen, void *arg)
{
<------>int ret = -EIO;
<------>int i;
<------>int restarts = 0;
 
<------>/* Clear OBF */
<------>for (i = 0; i < 10 && (obf_status(0x6c) == 1); i++)
<------><------>inb(0x68);
<------>if (i == 10) {
<------><------>printk(KERN_ERR "olpc-ec:  timeout while attempting to "
<------><------><------><------>"clear OBF flag!\n");
<------><------>goto err;
<------>}
 
<------>if (wait_on_ibf(0x6c, 0)) {
<------><------>printk(KERN_ERR "olpc-ec:  timeout waiting for EC to "
<------><------><------><------>"quiesce!\n");
<------><------>goto err;
<------>}
 
restart:
<------>/*
<------> * Note that if we time out during any IBF checks, that's a failure;
<------> * we have to return.  There's no way for the kernel to clear that.
<------> *
<------> * If we time out during an OBF check, we can restart the command;
<------> * reissuing it will clear the OBF flag, and we should be alright.
<------> * The OBF flag will sometimes misbehave due to what we believe
<------> * is a hardware quirk..
<------> */
<------>pr_devel("olpc-ec:  running cmd 0x%x\n", cmd);
<------>outb(cmd, 0x6c);
 
<------>if (wait_on_ibf(0x6c, 0)) {
<------><------>printk(KERN_ERR "olpc-ec:  timeout waiting for EC to read "
<------><------><------><------>"command!\n");
<------><------>goto err;
<------>}
 
<------>if (inbuf && inlen) {
<------><------>/* write data to EC */
<------><------>for (i = 0; i < inlen; i++) {
<------><------><------>pr_devel("olpc-ec:  sending cmd arg 0x%x\n", inbuf[i]);
<------><------><------>outb(inbuf[i], 0x68);
<------><------><------>if (wait_on_ibf(0x6c, 0)) {
<------><------><------><------>printk(KERN_ERR "olpc-ec:  timeout waiting for"
<------><------><------><------><------><------>" EC accept data!\n");
<------><------><------><------>goto err;
<------><------><------>}
<------><------>}
<------>}
<------>if (outbuf && outlen) {
<------><------>/* read data from EC */
<------><------>for (i = 0; i < outlen; i++) {
<------><------><------>if (wait_on_obf(0x6c, 1)) {
<------><------><------><------>printk(KERN_ERR "olpc-ec:  timeout waiting for"
<------><------><------><------><------><------>" EC to provide data!\n");
<------><------><------><------>if (restarts++ < 10)
<------><------><------><------><------>goto restart;
<------><------><------><------>goto err;
<------><------><------>}
<------><------><------>outbuf[i] = inb(0x68);
<------><------><------>pr_devel("olpc-ec:  received 0x%x\n", outbuf[i]);
<------><------>}
<------>}
 
<------>ret = 0;
err:
<------>return ret;
}
 
static bool __init check_ofw_architecture(struct device_node *root)
{
<------>const char *olpc_arch;
<------>int propsize;
 
<------>olpc_arch = of_get_property(root, "architecture", &propsize);
<------>return propsize == 5 && strncmp("OLPC", olpc_arch, 5) == 0;
}
 
static u32 __init get_board_revision(struct device_node *root)
{
<------>int propsize;
<------>const __be32 *rev;
 
<------>rev = of_get_property(root, "board-revision-int", &propsize);
<------>if (propsize != 4)
<------><------>return 0;
 
<------>return be32_to_cpu(*rev);
}
 
static bool __init platform_detect(void)
{
<------>struct device_node *root = of_find_node_by_path("/");
<------>bool success;
 
<------>if (!root)
<------><------>return false;
 
<------>success = check_ofw_architecture(root);
<------>if (success) {
<------><------>olpc_platform_info.boardrev = get_board_revision(root);
<------><------>olpc_platform_info.flags |= OLPC_F_PRESENT;
 
<------><------>pr_info("OLPC board revision %s%X\n",
<------><------><------>((olpc_platform_info.boardrev & 0xf) < 8) ? "pre" : "",
<------><------><------>olpc_platform_info.boardrev >> 4);
<------>}
 
<------>of_node_put(root);
<------>return success;
}
 
static int __init add_xo1_platform_devices(void)
{
<------>struct platform_device *pdev;
 
<------>pdev = platform_device_register_simple("xo1-rfkill", -1, NULL, 0);
<------>if (IS_ERR(pdev))
<------><------>return PTR_ERR(pdev);
 
<------>pdev = platform_device_register_simple("olpc-xo1", -1, NULL, 0);
 
<------>return PTR_ERR_OR_ZERO(pdev);
}
 
static int olpc_xo1_ec_suspend(struct platform_device *pdev)
{
<------>/*
<------> * Squelch SCIs while suspended.  This is a fix for
<------> * <http://dev.laptop.org/ticket/1835>.
<------> */
<------>return olpc_ec_cmd(EC_SET_SCI_INHIBIT, NULL, 0, NULL, 0);
}
 
static int olpc_xo1_ec_resume(struct platform_device *pdev)
{
<------>/* Tell the EC to stop inhibiting SCIs */
<------>olpc_ec_cmd(EC_SET_SCI_INHIBIT_RELEASE, NULL, 0, NULL, 0);
 
<------>/*
<------> * Tell the wireless module to restart USB communication.
<------> * Must be done twice.
<------> */
<------>olpc_ec_cmd(EC_WAKE_UP_WLAN, NULL, 0, NULL, 0);
<------>olpc_ec_cmd(EC_WAKE_UP_WLAN, NULL, 0, NULL, 0);
 
<------>return 0;
}
 
static struct olpc_ec_driver ec_xo1_driver = {
<------>.suspend = olpc_xo1_ec_suspend,
<------>.resume = olpc_xo1_ec_resume,
<------>.ec_cmd = olpc_xo1_ec_cmd,
#ifdef CONFIG_OLPC_XO1_SCI
<------>/*
<------> * XO-1 EC wakeups are available when olpc-xo1-sci driver is
<------> * compiled in
<------> */
<------>.wakeup_available = true,
#endif
};
 
static struct olpc_ec_driver ec_xo1_5_driver = {
<------>.ec_cmd = olpc_xo1_ec_cmd,
#ifdef CONFIG_OLPC_XO15_SCI
<------>/*
<------> * XO-1.5 EC wakeups are available when olpc-xo15-sci driver is
<------> * compiled in
<------> */
<------>.wakeup_available = true,
#endif
};
 
static int __init olpc_init(void)
{
<------>int r = 0;
 
<------>if (!olpc_ofw_present() || !platform_detect())
<------><------>return 0;
 
<------>/* register the XO-1 and 1.5-specific EC handler */
<------>if (olpc_platform_info.boardrev < olpc_board_pre(0xd0))	/* XO-1 */
<------><------>olpc_ec_driver_register(&ec_xo1_driver, NULL);
<------>else
<------><------>olpc_ec_driver_register(&ec_xo1_5_driver, NULL);
<------>platform_device_register_simple("olpc-ec", -1, NULL, 0);
 
<------>/* assume B1 and above models always have a DCON */
<------>if (olpc_board_at_least(olpc_board(0xb1)))
<------><------>olpc_platform_info.flags |= OLPC_F_DCON;
 
#ifdef CONFIG_PCI_OLPC
<------>/* If the VSA exists let it emulate PCI, if not emulate in kernel.
<------> * XO-1 only. */
<------>if (olpc_platform_info.boardrev < olpc_board_pre(0xd0) &&
<------><------><------>!cs5535_has_vsa2())
<------><------>x86_init.pci.arch_init = pci_olpc_init;
#endif
 
<------>if (olpc_platform_info.boardrev < olpc_board_pre(0xd0)) { /* XO-1 */
<------><------>r = add_xo1_platform_devices();
<------><------>if (r)
<------><------><------>return r;
<------>}
 
<------>return 0;
}
 
postcore_initcall(olpc_init);