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321 lines
7.8 KiB
321 lines
7.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Support for the OLPC DCON and OLPC EC access |
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* |
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* Copyright © 2006 Advanced Micro Devices, Inc. |
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* Copyright © 2007-2008 Andres Salomon <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/export.h> |
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#include <linux/delay.h> |
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#include <linux/io.h> |
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#include <linux/string.h> |
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#include <linux/platform_device.h> |
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#include <linux/of.h> |
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#include <linux/syscore_ops.h> |
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#include <linux/mutex.h> |
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#include <linux/olpc-ec.h> |
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#include <asm/geode.h> |
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#include <asm/setup.h> |
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#include <asm/olpc.h> |
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#include <asm/olpc_ofw.h> |
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struct olpc_platform_t olpc_platform_info; |
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EXPORT_SYMBOL_GPL(olpc_platform_info); |
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/* what the timeout *should* be (in ms) */ |
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#define EC_BASE_TIMEOUT 20 |
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/* the timeout that bugs in the EC might force us to actually use */ |
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static int ec_timeout = EC_BASE_TIMEOUT; |
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static int __init olpc_ec_timeout_set(char *str) |
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{ |
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if (get_option(&str, &ec_timeout) != 1) { |
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ec_timeout = EC_BASE_TIMEOUT; |
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printk(KERN_ERR "olpc-ec: invalid argument to " |
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"'olpc_ec_timeout=', ignoring!\n"); |
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} |
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printk(KERN_DEBUG "olpc-ec: using %d ms delay for EC commands.\n", |
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ec_timeout); |
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return 1; |
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} |
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__setup("olpc_ec_timeout=", olpc_ec_timeout_set); |
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/* |
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* These {i,o}bf_status functions return whether the buffers are full or not. |
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*/ |
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static inline unsigned int ibf_status(unsigned int port) |
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{ |
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return !!(inb(port) & 0x02); |
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} |
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static inline unsigned int obf_status(unsigned int port) |
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{ |
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return inb(port) & 0x01; |
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} |
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#define wait_on_ibf(p, d) __wait_on_ibf(__LINE__, (p), (d)) |
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static int __wait_on_ibf(unsigned int line, unsigned int port, int desired) |
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{ |
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unsigned int timeo; |
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int state = ibf_status(port); |
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for (timeo = ec_timeout; state != desired && timeo; timeo--) { |
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mdelay(1); |
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state = ibf_status(port); |
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} |
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if ((state == desired) && (ec_timeout > EC_BASE_TIMEOUT) && |
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timeo < (ec_timeout - EC_BASE_TIMEOUT)) { |
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printk(KERN_WARNING "olpc-ec: %d: waited %u ms for IBF!\n", |
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line, ec_timeout - timeo); |
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} |
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return !(state == desired); |
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} |
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#define wait_on_obf(p, d) __wait_on_obf(__LINE__, (p), (d)) |
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static int __wait_on_obf(unsigned int line, unsigned int port, int desired) |
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{ |
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unsigned int timeo; |
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int state = obf_status(port); |
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for (timeo = ec_timeout; state != desired && timeo; timeo--) { |
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mdelay(1); |
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state = obf_status(port); |
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} |
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if ((state == desired) && (ec_timeout > EC_BASE_TIMEOUT) && |
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timeo < (ec_timeout - EC_BASE_TIMEOUT)) { |
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printk(KERN_WARNING "olpc-ec: %d: waited %u ms for OBF!\n", |
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line, ec_timeout - timeo); |
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} |
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return !(state == desired); |
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} |
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/* |
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* This allows the kernel to run Embedded Controller commands. The EC is |
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* documented at <http://wiki.laptop.org/go/Embedded_controller>, and the |
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* available EC commands are here: |
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* <http://wiki.laptop.org/go/Ec_specification>. Unfortunately, while |
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* OpenFirmware's source is available, the EC's is not. |
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*/ |
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static int olpc_xo1_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf, |
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size_t outlen, void *arg) |
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{ |
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int ret = -EIO; |
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int i; |
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int restarts = 0; |
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/* Clear OBF */ |
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for (i = 0; i < 10 && (obf_status(0x6c) == 1); i++) |
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inb(0x68); |
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if (i == 10) { |
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printk(KERN_ERR "olpc-ec: timeout while attempting to " |
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"clear OBF flag!\n"); |
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goto err; |
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} |
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if (wait_on_ibf(0x6c, 0)) { |
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printk(KERN_ERR "olpc-ec: timeout waiting for EC to " |
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"quiesce!\n"); |
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goto err; |
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} |
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restart: |
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/* |
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* Note that if we time out during any IBF checks, that's a failure; |
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* we have to return. There's no way for the kernel to clear that. |
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* |
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* If we time out during an OBF check, we can restart the command; |
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* reissuing it will clear the OBF flag, and we should be alright. |
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* The OBF flag will sometimes misbehave due to what we believe |
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* is a hardware quirk.. |
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*/ |
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pr_devel("olpc-ec: running cmd 0x%x\n", cmd); |
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outb(cmd, 0x6c); |
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if (wait_on_ibf(0x6c, 0)) { |
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printk(KERN_ERR "olpc-ec: timeout waiting for EC to read " |
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"command!\n"); |
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goto err; |
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} |
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if (inbuf && inlen) { |
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/* write data to EC */ |
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for (i = 0; i < inlen; i++) { |
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pr_devel("olpc-ec: sending cmd arg 0x%x\n", inbuf[i]); |
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outb(inbuf[i], 0x68); |
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if (wait_on_ibf(0x6c, 0)) { |
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printk(KERN_ERR "olpc-ec: timeout waiting for" |
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" EC accept data!\n"); |
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goto err; |
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} |
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} |
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} |
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if (outbuf && outlen) { |
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/* read data from EC */ |
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for (i = 0; i < outlen; i++) { |
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if (wait_on_obf(0x6c, 1)) { |
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printk(KERN_ERR "olpc-ec: timeout waiting for" |
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" EC to provide data!\n"); |
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if (restarts++ < 10) |
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goto restart; |
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goto err; |
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} |
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outbuf[i] = inb(0x68); |
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pr_devel("olpc-ec: received 0x%x\n", outbuf[i]); |
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} |
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} |
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ret = 0; |
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err: |
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return ret; |
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} |
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static bool __init check_ofw_architecture(struct device_node *root) |
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{ |
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const char *olpc_arch; |
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int propsize; |
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olpc_arch = of_get_property(root, "architecture", &propsize); |
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return propsize == 5 && strncmp("OLPC", olpc_arch, 5) == 0; |
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} |
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static u32 __init get_board_revision(struct device_node *root) |
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{ |
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int propsize; |
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const __be32 *rev; |
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rev = of_get_property(root, "board-revision-int", &propsize); |
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if (propsize != 4) |
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return 0; |
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return be32_to_cpu(*rev); |
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} |
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static bool __init platform_detect(void) |
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{ |
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struct device_node *root = of_find_node_by_path("/"); |
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bool success; |
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if (!root) |
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return false; |
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success = check_ofw_architecture(root); |
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if (success) { |
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olpc_platform_info.boardrev = get_board_revision(root); |
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olpc_platform_info.flags |= OLPC_F_PRESENT; |
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pr_info("OLPC board revision %s%X\n", |
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((olpc_platform_info.boardrev & 0xf) < 8) ? "pre" : "", |
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olpc_platform_info.boardrev >> 4); |
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} |
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of_node_put(root); |
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return success; |
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} |
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static int __init add_xo1_platform_devices(void) |
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{ |
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struct platform_device *pdev; |
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pdev = platform_device_register_simple("xo1-rfkill", -1, NULL, 0); |
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if (IS_ERR(pdev)) |
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return PTR_ERR(pdev); |
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pdev = platform_device_register_simple("olpc-xo1", -1, NULL, 0); |
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return PTR_ERR_OR_ZERO(pdev); |
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} |
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static int olpc_xo1_ec_suspend(struct platform_device *pdev) |
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{ |
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/* |
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* Squelch SCIs while suspended. This is a fix for |
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* <http://dev.laptop.org/ticket/1835>. |
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*/ |
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return olpc_ec_cmd(EC_SET_SCI_INHIBIT, NULL, 0, NULL, 0); |
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} |
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static int olpc_xo1_ec_resume(struct platform_device *pdev) |
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{ |
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/* Tell the EC to stop inhibiting SCIs */ |
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olpc_ec_cmd(EC_SET_SCI_INHIBIT_RELEASE, NULL, 0, NULL, 0); |
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/* |
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* Tell the wireless module to restart USB communication. |
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* Must be done twice. |
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*/ |
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olpc_ec_cmd(EC_WAKE_UP_WLAN, NULL, 0, NULL, 0); |
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olpc_ec_cmd(EC_WAKE_UP_WLAN, NULL, 0, NULL, 0); |
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return 0; |
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} |
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static struct olpc_ec_driver ec_xo1_driver = { |
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.suspend = olpc_xo1_ec_suspend, |
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.resume = olpc_xo1_ec_resume, |
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.ec_cmd = olpc_xo1_ec_cmd, |
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#ifdef CONFIG_OLPC_XO1_SCI |
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/* |
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* XO-1 EC wakeups are available when olpc-xo1-sci driver is |
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* compiled in |
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*/ |
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.wakeup_available = true, |
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#endif |
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}; |
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static struct olpc_ec_driver ec_xo1_5_driver = { |
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.ec_cmd = olpc_xo1_ec_cmd, |
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#ifdef CONFIG_OLPC_XO1_5_SCI |
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/* |
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* XO-1.5 EC wakeups are available when olpc-xo15-sci driver is |
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* compiled in |
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*/ |
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.wakeup_available = true, |
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#endif |
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}; |
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static int __init olpc_init(void) |
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{ |
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int r = 0; |
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if (!olpc_ofw_present() || !platform_detect()) |
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return 0; |
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/* register the XO-1 and 1.5-specific EC handler */ |
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if (olpc_platform_info.boardrev < olpc_board_pre(0xd0)) /* XO-1 */ |
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olpc_ec_driver_register(&ec_xo1_driver, NULL); |
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else |
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olpc_ec_driver_register(&ec_xo1_5_driver, NULL); |
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platform_device_register_simple("olpc-ec", -1, NULL, 0); |
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/* assume B1 and above models always have a DCON */ |
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if (olpc_board_at_least(olpc_board(0xb1))) |
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olpc_platform_info.flags |= OLPC_F_DCON; |
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#ifdef CONFIG_PCI_OLPC |
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/* If the VSA exists let it emulate PCI, if not emulate in kernel. |
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* XO-1 only. */ |
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if (olpc_platform_info.boardrev < olpc_board_pre(0xd0) && |
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!cs5535_has_vsa2()) |
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x86_init.pci.arch_init = pci_olpc_init; |
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#endif |
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if (olpc_platform_info.boardrev < olpc_board_pre(0xd0)) { /* XO-1 */ |
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r = add_xo1_platform_devices(); |
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if (r) |
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return r; |
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} |
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return 0; |
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} |
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postcore_initcall(olpc_init);
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