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![Linus Torvalds](/assets/img/avatar_default.png)
- A series from Nick adding ARCH_WANT_IRQS_OFF_ACTIVATE_MM & selecting it for powerpc, as well as a related fix for sparc. - Remove support for PowerPC 601. - Some fixes for watchpoints & addition of a new ptrace flag for detecting ISA v3.1 (Power10) watchpoint features. - A fix for kernels using 4K pages and the hash MMU on bare metal Power9 systems with > 16TB of RAM, or RAM on the 2nd node. - A basic idle driver for shallow stop states on Power10. - Tweaks to our sched domains code to better inform the scheduler about the hardware topology on Power9/10, where two SMT4 cores can be presented by firmware as an SMT8 core. - A series doing further reworks & cleanups of our EEH code. - Addition of a filter for RTAS (firmware) calls done via sys_rtas(), to prevent root from overwriting kernel memory. - Other smaller features, fixes & cleanups. Thanks to: Alexey Kardashevskiy, Andrew Donnellan, Aneesh Kumar K.V, Athira Rajeev, Biwen Li, Cameron Berkenpas, Cédric Le Goater, Christophe Leroy, Christoph Hellwig, Colin Ian King, Daniel Axtens, David Dai, Finn Thain, Frederic Barrat, Gautham R. Shenoy, Greg Kurz, Gustavo Romero, Ira Weiny, Jason Yan, Joel Stanley, Jordan Niethe, Kajol Jain, Konrad Rzeszutek Wilk, Laurent Dufour, Leonardo Bras, Liu Shixin, Luca Ceresoli, Madhavan Srinivasan, Mahesh Salgaonkar, Nathan Lynch, Nicholas Mc Guire, Nicholas Piggin, Nick Desaulniers, Oliver O'Halloran, Pedro Miraglia Franco de Carvalho, Pratik Rajesh Sampat, Qian Cai, Qinglang Miao, Ravi Bangoria, Russell Currey, Satheesh Rajendran, Scott Cheloha, Segher Boessenkool, Srikar Dronamraju, Stan Johnson, Stephen Kitt, Stephen Rothwell, Thiago Jung Bauermann, Tyrel Datwyler, Vaibhav Jain, Vaidyanathan Srinivasan, Vasant Hegde, Wang Wensheng, Wolfram Sang, Yang Yingliang, zhengbin. -----BEGIN PGP SIGNATURE----- iQJHBAABCAAxFiEEJFGtCPCthwEv2Y/bUevqPMjhpYAFAl+JBQoTHG1wZUBlbGxl cm1hbi5pZC5hdQAKCRBR6+o8yOGlgJJAD/0e3tsFP+9rFlxKSJlDcMW3w7kXDRXE tG40F1ubYFLU8wtFVR0De3njTRsz5HyaNU6SI8CwPq48mCa7OFn1D1OeHonHXDX9 w6v3GE2S1uXXQnjm+czcfdjWQut0IwWBLx007/S23WcPff3Abc2irupKLNu+Gx29 b/yxJHZSRJVX59jSV94HkdJS75mDHQ3oUOlFGXtuGcUZDufpD1ynRcQOjr0V/8JU F4WAblFSe7hiczHGqIvfhFVJ+OikEhnj2aEMAL8U7vxzrAZ7RErKCN9s/0Tf0Ktx FzNEFNLHZGqh+qNDpKKmM+RnaeO2Lcoc9qVn7vMHOsXPzx9F5LJwkI/DgPjtgAq/ mFvGnQB/FapATnQeMluViC/qhEe5bQXLUfPP5i2+QOjK0QqwyFlUMgaVNfsY8jRW 0Q/sNA72Opzst4WUTveCd4SOInlUuat09e5nLooCRLW7u7/jIiXNRSFNvpOiwkfF EcIPJsi6FUQ4SNbqpRSNEO9fK5JZrrUtmr0pg8I7fZhHYGcxEjqPR6IWCs3DTsak 4/KhjhhTnP/IWJRw6qKAyNhEyEwpWqYZ97SIQbvSb1g/bS47AIdQdJRb0eEoRjhx sbbnnYFwPFkG4c1yQSIFanT9wNDQ2hFx/c/mRfbd7J+ordx9JsoqXjqrGuhsU/pH GttJLmkJ5FH+pQ== =akeX -----END PGP SIGNATURE----- Merge tag 'powerpc-5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: - A series from Nick adding ARCH_WANT_IRQS_OFF_ACTIVATE_MM & selecting it for powerpc, as well as a related fix for sparc. - Remove support for PowerPC 601. - Some fixes for watchpoints & addition of a new ptrace flag for detecting ISA v3.1 (Power10) watchpoint features. - A fix for kernels using 4K pages and the hash MMU on bare metal Power9 systems with > 16TB of RAM, or RAM on the 2nd node. - A basic idle driver for shallow stop states on Power10. - Tweaks to our sched domains code to better inform the scheduler about the hardware topology on Power9/10, where two SMT4 cores can be presented by firmware as an SMT8 core. - A series doing further reworks & cleanups of our EEH code. - Addition of a filter for RTAS (firmware) calls done via sys_rtas(), to prevent root from overwriting kernel memory. - Other smaller features, fixes & cleanups. Thanks to: Alexey Kardashevskiy, Andrew Donnellan, Aneesh Kumar K.V, Athira Rajeev, Biwen Li, Cameron Berkenpas, Cédric Le Goater, Christophe Leroy, Christoph Hellwig, Colin Ian King, Daniel Axtens, David Dai, Finn Thain, Frederic Barrat, Gautham R. Shenoy, Greg Kurz, Gustavo Romero, Ira Weiny, Jason Yan, Joel Stanley, Jordan Niethe, Kajol Jain, Konrad Rzeszutek Wilk, Laurent Dufour, Leonardo Bras, Liu Shixin, Luca Ceresoli, Madhavan Srinivasan, Mahesh Salgaonkar, Nathan Lynch, Nicholas Mc Guire, Nicholas Piggin, Nick Desaulniers, Oliver O'Halloran, Pedro Miraglia Franco de Carvalho, Pratik Rajesh Sampat, Qian Cai, Qinglang Miao, Ravi Bangoria, Russell Currey, Satheesh Rajendran, Scott Cheloha, Segher Boessenkool, Srikar Dronamraju, Stan Johnson, Stephen Kitt, Stephen Rothwell, Thiago Jung Bauermann, Tyrel Datwyler, Vaibhav Jain, Vaidyanathan Srinivasan, Vasant Hegde, Wang Wensheng, Wolfram Sang, Yang Yingliang, zhengbin. * tag 'powerpc-5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (228 commits) Revert "powerpc/pci: unmap legacy INTx interrupts when a PHB is removed" selftests/powerpc: Fix eeh-basic.sh exit codes cpufreq: powernv: Fix frame-size-overflow in powernv_cpufreq_reboot_notifier powerpc/time: Make get_tb() common to PPC32 and PPC64 powerpc/time: Make get_tbl() common to PPC32 and PPC64 powerpc/time: Remove get_tbu() powerpc/time: Avoid using get_tbl() and get_tbu() internally powerpc/time: Make mftb() common to PPC32 and PPC64 powerpc/time: Rename mftbl() to mftb() powerpc/32s: Remove #ifdef CONFIG_PPC_BOOK3S_32 in head_book3s_32.S powerpc/32s: Rename head_32.S to head_book3s_32.S powerpc/32s: Setup the early hash table at all time. powerpc/time: Remove ifdef in get_dec() and set_dec() powerpc: Remove get_tb_or_rtc() powerpc: Remove __USE_RTC() powerpc: Tidy up a bit after removal of PowerPC 601. powerpc: Remove support for PowerPC 601 powerpc: Remove PowerPC 601 powerpc: Drop SYNC_601() ISYNC_601() and SYNC() powerpc: Remove CONFIG_PPC601_SYNC_FIX ...
1337 lines
30 KiB
C
1337 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* PowerMac G5 SMU driver
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*
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* Copyright 2004 J. Mayer <l_indien@magic.fr>
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* Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
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*/
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/*
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* TODO:
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* - maybe add timeout to commands ?
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* - blocking version of time functions
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* - polling version of i2c commands (including timer that works with
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* interrupts off)
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* - maybe avoid some data copies with i2c by directly using the smu cmd
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* buffer and a lower level internal interface
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* - understand SMU -> CPU events and implement reception of them via
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* the userland interface
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/dmapool.h>
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#include <linux/memblock.h>
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#include <linux/vmalloc.h>
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#include <linux/highmem.h>
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#include <linux/jiffies.h>
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#include <linux/interrupt.h>
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#include <linux/rtc.h>
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#include <linux/completion.h>
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#include <linux/miscdevice.h>
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#include <linux/delay.h>
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#include <linux/poll.h>
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#include <linux/mutex.h>
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#include <linux/of_device.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <linux/slab.h>
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#include <linux/sched/signal.h>
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#include <asm/byteorder.h>
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#include <asm/io.h>
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#include <asm/prom.h>
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#include <asm/machdep.h>
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#include <asm/pmac_feature.h>
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#include <asm/smu.h>
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#include <asm/sections.h>
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#include <linux/uaccess.h>
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#define VERSION "0.7"
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#define AUTHOR "(c) 2005 Benjamin Herrenschmidt, IBM Corp."
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#undef DEBUG_SMU
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#ifdef DEBUG_SMU
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#define DPRINTK(fmt, args...) do { printk(KERN_DEBUG fmt , ##args); } while (0)
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#else
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#define DPRINTK(fmt, args...) do { } while (0)
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#endif
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/*
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* This is the command buffer passed to the SMU hardware
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*/
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#define SMU_MAX_DATA 254
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struct smu_cmd_buf {
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u8 cmd;
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u8 length;
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u8 data[SMU_MAX_DATA];
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};
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struct smu_device {
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spinlock_t lock;
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struct device_node *of_node;
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struct platform_device *of_dev;
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int doorbell; /* doorbell gpio */
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u32 __iomem *db_buf; /* doorbell buffer */
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struct device_node *db_node;
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unsigned int db_irq;
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int msg;
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struct device_node *msg_node;
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unsigned int msg_irq;
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struct smu_cmd_buf *cmd_buf; /* command buffer virtual */
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u32 cmd_buf_abs; /* command buffer absolute */
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struct list_head cmd_list;
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struct smu_cmd *cmd_cur; /* pending command */
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int broken_nap;
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struct list_head cmd_i2c_list;
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struct smu_i2c_cmd *cmd_i2c_cur; /* pending i2c command */
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struct timer_list i2c_timer;
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};
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/*
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* I don't think there will ever be more than one SMU, so
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* for now, just hard code that
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*/
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static DEFINE_MUTEX(smu_mutex);
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static struct smu_device *smu;
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static DEFINE_MUTEX(smu_part_access);
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static int smu_irq_inited;
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static unsigned long smu_cmdbuf_abs;
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static void smu_i2c_retry(struct timer_list *t);
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/*
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* SMU driver low level stuff
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*/
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static void smu_start_cmd(void)
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{
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unsigned long faddr, fend;
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struct smu_cmd *cmd;
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if (list_empty(&smu->cmd_list))
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return;
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/* Fetch first command in queue */
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cmd = list_entry(smu->cmd_list.next, struct smu_cmd, link);
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smu->cmd_cur = cmd;
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list_del(&cmd->link);
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DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd->cmd,
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cmd->data_len);
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DPRINTK("SMU: data buffer: %8ph\n", cmd->data_buf);
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/* Fill the SMU command buffer */
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smu->cmd_buf->cmd = cmd->cmd;
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smu->cmd_buf->length = cmd->data_len;
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memcpy(smu->cmd_buf->data, cmd->data_buf, cmd->data_len);
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/* Flush command and data to RAM */
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faddr = (unsigned long)smu->cmd_buf;
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fend = faddr + smu->cmd_buf->length + 2;
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flush_dcache_range(faddr, fend);
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/* We also disable NAP mode for the duration of the command
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* on U3 based machines.
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* This is slightly racy as it can be written back to 1 by a sysctl
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* but that never happens in practice. There seem to be an issue with
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* U3 based machines such as the iMac G5 where napping for the
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* whole duration of the command prevents the SMU from fetching it
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* from memory. This might be related to the strange i2c based
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* mechanism the SMU uses to access memory.
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*/
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if (smu->broken_nap)
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powersave_nap = 0;
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/* This isn't exactly a DMA mapping here, I suspect
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* the SMU is actually communicating with us via i2c to the
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* northbridge or the CPU to access RAM.
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*/
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writel(smu->cmd_buf_abs, smu->db_buf);
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/* Ring the SMU doorbell */
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pmac_do_feature_call(PMAC_FTR_WRITE_GPIO, NULL, smu->doorbell, 4);
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}
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static irqreturn_t smu_db_intr(int irq, void *arg)
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{
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unsigned long flags;
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struct smu_cmd *cmd;
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void (*done)(struct smu_cmd *cmd, void *misc) = NULL;
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void *misc = NULL;
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u8 gpio;
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int rc = 0;
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/* SMU completed the command, well, we hope, let's make sure
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* of it
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*/
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spin_lock_irqsave(&smu->lock, flags);
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gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
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if ((gpio & 7) != 7) {
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spin_unlock_irqrestore(&smu->lock, flags);
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return IRQ_HANDLED;
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}
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cmd = smu->cmd_cur;
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smu->cmd_cur = NULL;
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if (cmd == NULL)
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goto bail;
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if (rc == 0) {
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unsigned long faddr;
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int reply_len;
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u8 ack;
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/* CPU might have brought back the cache line, so we need
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* to flush again before peeking at the SMU response. We
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* flush the entire buffer for now as we haven't read the
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* reply length (it's only 2 cache lines anyway)
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*/
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faddr = (unsigned long)smu->cmd_buf;
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flush_dcache_range(faddr, faddr + 256);
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/* Now check ack */
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ack = (~cmd->cmd) & 0xff;
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if (ack != smu->cmd_buf->cmd) {
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DPRINTK("SMU: incorrect ack, want %x got %x\n",
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ack, smu->cmd_buf->cmd);
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rc = -EIO;
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}
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reply_len = rc == 0 ? smu->cmd_buf->length : 0;
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DPRINTK("SMU: reply len: %d\n", reply_len);
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if (reply_len > cmd->reply_len) {
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printk(KERN_WARNING "SMU: reply buffer too small,"
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"got %d bytes for a %d bytes buffer\n",
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reply_len, cmd->reply_len);
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reply_len = cmd->reply_len;
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}
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cmd->reply_len = reply_len;
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if (cmd->reply_buf && reply_len)
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memcpy(cmd->reply_buf, smu->cmd_buf->data, reply_len);
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}
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/* Now complete the command. Write status last in order as we lost
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* ownership of the command structure as soon as it's no longer -1
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*/
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done = cmd->done;
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misc = cmd->misc;
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mb();
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cmd->status = rc;
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/* Re-enable NAP mode */
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if (smu->broken_nap)
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powersave_nap = 1;
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bail:
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/* Start next command if any */
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smu_start_cmd();
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spin_unlock_irqrestore(&smu->lock, flags);
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/* Call command completion handler if any */
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if (done)
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done(cmd, misc);
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/* It's an edge interrupt, nothing to do */
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return IRQ_HANDLED;
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}
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static irqreturn_t smu_msg_intr(int irq, void *arg)
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{
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/* I don't quite know what to do with this one, we seem to never
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* receive it, so I suspect we have to arm it someway in the SMU
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* to start getting events that way.
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*/
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printk(KERN_INFO "SMU: message interrupt !\n");
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/* It's an edge interrupt, nothing to do */
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return IRQ_HANDLED;
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}
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/*
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* Queued command management.
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*
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*/
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int smu_queue_cmd(struct smu_cmd *cmd)
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{
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unsigned long flags;
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if (smu == NULL)
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return -ENODEV;
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if (cmd->data_len > SMU_MAX_DATA ||
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cmd->reply_len > SMU_MAX_DATA)
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return -EINVAL;
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cmd->status = 1;
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spin_lock_irqsave(&smu->lock, flags);
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list_add_tail(&cmd->link, &smu->cmd_list);
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if (smu->cmd_cur == NULL)
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smu_start_cmd();
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spin_unlock_irqrestore(&smu->lock, flags);
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/* Workaround for early calls when irq isn't available */
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if (!smu_irq_inited || !smu->db_irq)
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smu_spinwait_cmd(cmd);
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return 0;
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}
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EXPORT_SYMBOL(smu_queue_cmd);
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int smu_queue_simple(struct smu_simple_cmd *scmd, u8 command,
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unsigned int data_len,
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void (*done)(struct smu_cmd *cmd, void *misc),
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void *misc, ...)
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{
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struct smu_cmd *cmd = &scmd->cmd;
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va_list list;
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int i;
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if (data_len > sizeof(scmd->buffer))
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return -EINVAL;
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memset(scmd, 0, sizeof(*scmd));
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cmd->cmd = command;
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cmd->data_len = data_len;
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cmd->data_buf = scmd->buffer;
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cmd->reply_len = sizeof(scmd->buffer);
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cmd->reply_buf = scmd->buffer;
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cmd->done = done;
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cmd->misc = misc;
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va_start(list, misc);
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for (i = 0; i < data_len; ++i)
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scmd->buffer[i] = (u8)va_arg(list, int);
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va_end(list);
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return smu_queue_cmd(cmd);
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}
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EXPORT_SYMBOL(smu_queue_simple);
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void smu_poll(void)
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{
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u8 gpio;
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if (smu == NULL)
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return;
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gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
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if ((gpio & 7) == 7)
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smu_db_intr(smu->db_irq, smu);
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}
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EXPORT_SYMBOL(smu_poll);
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void smu_done_complete(struct smu_cmd *cmd, void *misc)
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{
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struct completion *comp = misc;
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complete(comp);
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}
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EXPORT_SYMBOL(smu_done_complete);
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void smu_spinwait_cmd(struct smu_cmd *cmd)
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{
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while(cmd->status == 1)
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smu_poll();
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}
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EXPORT_SYMBOL(smu_spinwait_cmd);
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/* RTC low level commands */
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static inline int bcd2hex (int n)
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{
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return (((n & 0xf0) >> 4) * 10) + (n & 0xf);
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}
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static inline int hex2bcd (int n)
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{
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return ((n / 10) << 4) + (n % 10);
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}
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static inline void smu_fill_set_rtc_cmd(struct smu_cmd_buf *cmd_buf,
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struct rtc_time *time)
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{
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cmd_buf->cmd = 0x8e;
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cmd_buf->length = 8;
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cmd_buf->data[0] = 0x80;
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cmd_buf->data[1] = hex2bcd(time->tm_sec);
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cmd_buf->data[2] = hex2bcd(time->tm_min);
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cmd_buf->data[3] = hex2bcd(time->tm_hour);
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cmd_buf->data[4] = time->tm_wday;
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cmd_buf->data[5] = hex2bcd(time->tm_mday);
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cmd_buf->data[6] = hex2bcd(time->tm_mon) + 1;
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cmd_buf->data[7] = hex2bcd(time->tm_year - 100);
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}
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int smu_get_rtc_time(struct rtc_time *time, int spinwait)
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{
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struct smu_simple_cmd cmd;
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int rc;
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|
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if (smu == NULL)
|
|
return -ENODEV;
|
|
|
|
memset(time, 0, sizeof(struct rtc_time));
|
|
rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 1, NULL, NULL,
|
|
SMU_CMD_RTC_GET_DATETIME);
|
|
if (rc)
|
|
return rc;
|
|
smu_spinwait_simple(&cmd);
|
|
|
|
time->tm_sec = bcd2hex(cmd.buffer[0]);
|
|
time->tm_min = bcd2hex(cmd.buffer[1]);
|
|
time->tm_hour = bcd2hex(cmd.buffer[2]);
|
|
time->tm_wday = bcd2hex(cmd.buffer[3]);
|
|
time->tm_mday = bcd2hex(cmd.buffer[4]);
|
|
time->tm_mon = bcd2hex(cmd.buffer[5]) - 1;
|
|
time->tm_year = bcd2hex(cmd.buffer[6]) + 100;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int smu_set_rtc_time(struct rtc_time *time, int spinwait)
|
|
{
|
|
struct smu_simple_cmd cmd;
|
|
int rc;
|
|
|
|
if (smu == NULL)
|
|
return -ENODEV;
|
|
|
|
rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 8, NULL, NULL,
|
|
SMU_CMD_RTC_SET_DATETIME,
|
|
hex2bcd(time->tm_sec),
|
|
hex2bcd(time->tm_min),
|
|
hex2bcd(time->tm_hour),
|
|
time->tm_wday,
|
|
hex2bcd(time->tm_mday),
|
|
hex2bcd(time->tm_mon) + 1,
|
|
hex2bcd(time->tm_year - 100));
|
|
if (rc)
|
|
return rc;
|
|
smu_spinwait_simple(&cmd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void smu_shutdown(void)
|
|
{
|
|
struct smu_simple_cmd cmd;
|
|
|
|
if (smu == NULL)
|
|
return;
|
|
|
|
if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 9, NULL, NULL,
|
|
'S', 'H', 'U', 'T', 'D', 'O', 'W', 'N', 0))
|
|
return;
|
|
smu_spinwait_simple(&cmd);
|
|
for (;;)
|
|
;
|
|
}
|
|
|
|
|
|
void smu_restart(void)
|
|
{
|
|
struct smu_simple_cmd cmd;
|
|
|
|
if (smu == NULL)
|
|
return;
|
|
|
|
if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, NULL, NULL,
|
|
'R', 'E', 'S', 'T', 'A', 'R', 'T', 0))
|
|
return;
|
|
smu_spinwait_simple(&cmd);
|
|
for (;;)
|
|
;
|
|
}
|
|
|
|
|
|
int smu_present(void)
|
|
{
|
|
return smu != NULL;
|
|
}
|
|
EXPORT_SYMBOL(smu_present);
|
|
|
|
|
|
int __init smu_init (void)
|
|
{
|
|
struct device_node *np;
|
|
const u32 *data;
|
|
int ret = 0;
|
|
|
|
np = of_find_node_by_type(NULL, "smu");
|
|
if (np == NULL)
|
|
return -ENODEV;
|
|
|
|
printk(KERN_INFO "SMU: Driver %s %s\n", VERSION, AUTHOR);
|
|
|
|
/*
|
|
* SMU based G5s need some memory below 2Gb. Thankfully this is
|
|
* called at a time where memblock is still available.
|
|
*/
|
|
smu_cmdbuf_abs = memblock_phys_alloc_range(4096, 4096, 0, 0x80000000UL);
|
|
if (smu_cmdbuf_abs == 0) {
|
|
printk(KERN_ERR "SMU: Command buffer allocation failed !\n");
|
|
ret = -EINVAL;
|
|
goto fail_np;
|
|
}
|
|
|
|
smu = memblock_alloc(sizeof(struct smu_device), SMP_CACHE_BYTES);
|
|
if (!smu)
|
|
panic("%s: Failed to allocate %zu bytes\n", __func__,
|
|
sizeof(struct smu_device));
|
|
|
|
spin_lock_init(&smu->lock);
|
|
INIT_LIST_HEAD(&smu->cmd_list);
|
|
INIT_LIST_HEAD(&smu->cmd_i2c_list);
|
|
smu->of_node = np;
|
|
smu->db_irq = 0;
|
|
smu->msg_irq = 0;
|
|
|
|
/* smu_cmdbuf_abs is in the low 2G of RAM, can be converted to a
|
|
* 32 bits value safely
|
|
*/
|
|
smu->cmd_buf_abs = (u32)smu_cmdbuf_abs;
|
|
smu->cmd_buf = __va(smu_cmdbuf_abs);
|
|
|
|
smu->db_node = of_find_node_by_name(NULL, "smu-doorbell");
|
|
if (smu->db_node == NULL) {
|
|
printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n");
|
|
ret = -ENXIO;
|
|
goto fail_bootmem;
|
|
}
|
|
data = of_get_property(smu->db_node, "reg", NULL);
|
|
if (data == NULL) {
|
|
printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n");
|
|
ret = -ENXIO;
|
|
goto fail_db_node;
|
|
}
|
|
|
|
/* Current setup has one doorbell GPIO that does both doorbell
|
|
* and ack. GPIOs are at 0x50, best would be to find that out
|
|
* in the device-tree though.
|
|
*/
|
|
smu->doorbell = *data;
|
|
if (smu->doorbell < 0x50)
|
|
smu->doorbell += 0x50;
|
|
|
|
/* Now look for the smu-interrupt GPIO */
|
|
do {
|
|
smu->msg_node = of_find_node_by_name(NULL, "smu-interrupt");
|
|
if (smu->msg_node == NULL)
|
|
break;
|
|
data = of_get_property(smu->msg_node, "reg", NULL);
|
|
if (data == NULL) {
|
|
of_node_put(smu->msg_node);
|
|
smu->msg_node = NULL;
|
|
break;
|
|
}
|
|
smu->msg = *data;
|
|
if (smu->msg < 0x50)
|
|
smu->msg += 0x50;
|
|
} while(0);
|
|
|
|
/* Doorbell buffer is currently hard-coded, I didn't find a proper
|
|
* device-tree entry giving the address. Best would probably to use
|
|
* an offset for K2 base though, but let's do it that way for now.
|
|
*/
|
|
smu->db_buf = ioremap(0x8000860c, 0x1000);
|
|
if (smu->db_buf == NULL) {
|
|
printk(KERN_ERR "SMU: Can't map doorbell buffer pointer !\n");
|
|
ret = -ENXIO;
|
|
goto fail_msg_node;
|
|
}
|
|
|
|
/* U3 has an issue with NAP mode when issuing SMU commands */
|
|
smu->broken_nap = pmac_get_uninorth_variant() < 4;
|
|
if (smu->broken_nap)
|
|
printk(KERN_INFO "SMU: using NAP mode workaround\n");
|
|
|
|
sys_ctrler = SYS_CTRLER_SMU;
|
|
return 0;
|
|
|
|
fail_msg_node:
|
|
of_node_put(smu->msg_node);
|
|
fail_db_node:
|
|
of_node_put(smu->db_node);
|
|
fail_bootmem:
|
|
memblock_free(__pa(smu), sizeof(struct smu_device));
|
|
smu = NULL;
|
|
fail_np:
|
|
of_node_put(np);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int smu_late_init(void)
|
|
{
|
|
if (!smu)
|
|
return 0;
|
|
|
|
timer_setup(&smu->i2c_timer, smu_i2c_retry, 0);
|
|
|
|
if (smu->db_node) {
|
|
smu->db_irq = irq_of_parse_and_map(smu->db_node, 0);
|
|
if (!smu->db_irq)
|
|
printk(KERN_ERR "smu: failed to map irq for node %pOF\n",
|
|
smu->db_node);
|
|
}
|
|
if (smu->msg_node) {
|
|
smu->msg_irq = irq_of_parse_and_map(smu->msg_node, 0);
|
|
if (!smu->msg_irq)
|
|
printk(KERN_ERR "smu: failed to map irq for node %pOF\n",
|
|
smu->msg_node);
|
|
}
|
|
|
|
/*
|
|
* Try to request the interrupts
|
|
*/
|
|
|
|
if (smu->db_irq) {
|
|
if (request_irq(smu->db_irq, smu_db_intr,
|
|
IRQF_SHARED, "SMU doorbell", smu) < 0) {
|
|
printk(KERN_WARNING "SMU: can't "
|
|
"request interrupt %d\n",
|
|
smu->db_irq);
|
|
smu->db_irq = 0;
|
|
}
|
|
}
|
|
|
|
if (smu->msg_irq) {
|
|
if (request_irq(smu->msg_irq, smu_msg_intr,
|
|
IRQF_SHARED, "SMU message", smu) < 0) {
|
|
printk(KERN_WARNING "SMU: can't "
|
|
"request interrupt %d\n",
|
|
smu->msg_irq);
|
|
smu->msg_irq = 0;
|
|
}
|
|
}
|
|
|
|
smu_irq_inited = 1;
|
|
return 0;
|
|
}
|
|
/* This has to be before arch_initcall as the low i2c stuff relies on the
|
|
* above having been done before we reach arch_initcalls
|
|
*/
|
|
core_initcall(smu_late_init);
|
|
|
|
/*
|
|
* sysfs visibility
|
|
*/
|
|
|
|
static void smu_expose_childs(struct work_struct *unused)
|
|
{
|
|
struct device_node *np;
|
|
|
|
for_each_child_of_node(smu->of_node, np)
|
|
if (of_device_is_compatible(np, "smu-sensors"))
|
|
of_platform_device_create(np, "smu-sensors",
|
|
&smu->of_dev->dev);
|
|
}
|
|
|
|
static DECLARE_WORK(smu_expose_childs_work, smu_expose_childs);
|
|
|
|
static int smu_platform_probe(struct platform_device* dev)
|
|
{
|
|
if (!smu)
|
|
return -ENODEV;
|
|
smu->of_dev = dev;
|
|
|
|
/*
|
|
* Ok, we are matched, now expose all i2c busses. We have to defer
|
|
* that unfortunately or it would deadlock inside the device model
|
|
*/
|
|
schedule_work(&smu_expose_childs_work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id smu_platform_match[] =
|
|
{
|
|
{
|
|
.type = "smu",
|
|
},
|
|
{},
|
|
};
|
|
|
|
static struct platform_driver smu_of_platform_driver =
|
|
{
|
|
.driver = {
|
|
.name = "smu",
|
|
.of_match_table = smu_platform_match,
|
|
},
|
|
.probe = smu_platform_probe,
|
|
};
|
|
|
|
static int __init smu_init_sysfs(void)
|
|
{
|
|
/*
|
|
* For now, we don't power manage machines with an SMU chip,
|
|
* I'm a bit too far from figuring out how that works with those
|
|
* new chipsets, but that will come back and bite us
|
|
*/
|
|
platform_driver_register(&smu_of_platform_driver);
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(smu_init_sysfs);
|
|
|
|
struct platform_device *smu_get_ofdev(void)
|
|
{
|
|
if (!smu)
|
|
return NULL;
|
|
return smu->of_dev;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(smu_get_ofdev);
|
|
|
|
/*
|
|
* i2c interface
|
|
*/
|
|
|
|
static void smu_i2c_complete_command(struct smu_i2c_cmd *cmd, int fail)
|
|
{
|
|
void (*done)(struct smu_i2c_cmd *cmd, void *misc) = cmd->done;
|
|
void *misc = cmd->misc;
|
|
unsigned long flags;
|
|
|
|
/* Check for read case */
|
|
if (!fail && cmd->read) {
|
|
if (cmd->pdata[0] < 1)
|
|
fail = 1;
|
|
else
|
|
memcpy(cmd->info.data, &cmd->pdata[1],
|
|
cmd->info.datalen);
|
|
}
|
|
|
|
DPRINTK("SMU: completing, success: %d\n", !fail);
|
|
|
|
/* Update status and mark no pending i2c command with lock
|
|
* held so nobody comes in while we dequeue an eventual
|
|
* pending next i2c command
|
|
*/
|
|
spin_lock_irqsave(&smu->lock, flags);
|
|
smu->cmd_i2c_cur = NULL;
|
|
wmb();
|
|
cmd->status = fail ? -EIO : 0;
|
|
|
|
/* Is there another i2c command waiting ? */
|
|
if (!list_empty(&smu->cmd_i2c_list)) {
|
|
struct smu_i2c_cmd *newcmd;
|
|
|
|
/* Fetch it, new current, remove from list */
|
|
newcmd = list_entry(smu->cmd_i2c_list.next,
|
|
struct smu_i2c_cmd, link);
|
|
smu->cmd_i2c_cur = newcmd;
|
|
list_del(&cmd->link);
|
|
|
|
/* Queue with low level smu */
|
|
list_add_tail(&cmd->scmd.link, &smu->cmd_list);
|
|
if (smu->cmd_cur == NULL)
|
|
smu_start_cmd();
|
|
}
|
|
spin_unlock_irqrestore(&smu->lock, flags);
|
|
|
|
/* Call command completion handler if any */
|
|
if (done)
|
|
done(cmd, misc);
|
|
|
|
}
|
|
|
|
|
|
static void smu_i2c_retry(struct timer_list *unused)
|
|
{
|
|
struct smu_i2c_cmd *cmd = smu->cmd_i2c_cur;
|
|
|
|
DPRINTK("SMU: i2c failure, requeuing...\n");
|
|
|
|
/* requeue command simply by resetting reply_len */
|
|
cmd->pdata[0] = 0xff;
|
|
cmd->scmd.reply_len = sizeof(cmd->pdata);
|
|
smu_queue_cmd(&cmd->scmd);
|
|
}
|
|
|
|
|
|
static void smu_i2c_low_completion(struct smu_cmd *scmd, void *misc)
|
|
{
|
|
struct smu_i2c_cmd *cmd = misc;
|
|
int fail = 0;
|
|
|
|
DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n",
|
|
cmd->stage, scmd->status, cmd->pdata[0], scmd->reply_len);
|
|
|
|
/* Check for possible status */
|
|
if (scmd->status < 0)
|
|
fail = 1;
|
|
else if (cmd->read) {
|
|
if (cmd->stage == 0)
|
|
fail = cmd->pdata[0] != 0;
|
|
else
|
|
fail = cmd->pdata[0] >= 0x80;
|
|
} else {
|
|
fail = cmd->pdata[0] != 0;
|
|
}
|
|
|
|
/* Handle failures by requeuing command, after 5ms interval
|
|
*/
|
|
if (fail && --cmd->retries > 0) {
|
|
DPRINTK("SMU: i2c failure, starting timer...\n");
|
|
BUG_ON(cmd != smu->cmd_i2c_cur);
|
|
if (!smu_irq_inited) {
|
|
mdelay(5);
|
|
smu_i2c_retry(NULL);
|
|
return;
|
|
}
|
|
mod_timer(&smu->i2c_timer, jiffies + msecs_to_jiffies(5));
|
|
return;
|
|
}
|
|
|
|
/* If failure or stage 1, command is complete */
|
|
if (fail || cmd->stage != 0) {
|
|
smu_i2c_complete_command(cmd, fail);
|
|
return;
|
|
}
|
|
|
|
DPRINTK("SMU: going to stage 1\n");
|
|
|
|
/* Ok, initial command complete, now poll status */
|
|
scmd->reply_buf = cmd->pdata;
|
|
scmd->reply_len = sizeof(cmd->pdata);
|
|
scmd->data_buf = cmd->pdata;
|
|
scmd->data_len = 1;
|
|
cmd->pdata[0] = 0;
|
|
cmd->stage = 1;
|
|
cmd->retries = 20;
|
|
smu_queue_cmd(scmd);
|
|
}
|
|
|
|
|
|
int smu_queue_i2c(struct smu_i2c_cmd *cmd)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (smu == NULL)
|
|
return -ENODEV;
|
|
|
|
/* Fill most fields of scmd */
|
|
cmd->scmd.cmd = SMU_CMD_I2C_COMMAND;
|
|
cmd->scmd.done = smu_i2c_low_completion;
|
|
cmd->scmd.misc = cmd;
|
|
cmd->scmd.reply_buf = cmd->pdata;
|
|
cmd->scmd.reply_len = sizeof(cmd->pdata);
|
|
cmd->scmd.data_buf = (u8 *)(char *)&cmd->info;
|
|
cmd->scmd.status = 1;
|
|
cmd->stage = 0;
|
|
cmd->pdata[0] = 0xff;
|
|
cmd->retries = 20;
|
|
cmd->status = 1;
|
|
|
|
/* Check transfer type, sanitize some "info" fields
|
|
* based on transfer type and do more checking
|
|
*/
|
|
cmd->info.caddr = cmd->info.devaddr;
|
|
cmd->read = cmd->info.devaddr & 0x01;
|
|
switch(cmd->info.type) {
|
|
case SMU_I2C_TRANSFER_SIMPLE:
|
|
memset(&cmd->info.sublen, 0, 4);
|
|
break;
|
|
case SMU_I2C_TRANSFER_COMBINED:
|
|
cmd->info.devaddr &= 0xfe;
|
|
fallthrough;
|
|
case SMU_I2C_TRANSFER_STDSUB:
|
|
if (cmd->info.sublen > 3)
|
|
return -EINVAL;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Finish setting up command based on transfer direction
|
|
*/
|
|
if (cmd->read) {
|
|
if (cmd->info.datalen > SMU_I2C_READ_MAX)
|
|
return -EINVAL;
|
|
memset(cmd->info.data, 0xff, cmd->info.datalen);
|
|
cmd->scmd.data_len = 9;
|
|
} else {
|
|
if (cmd->info.datalen > SMU_I2C_WRITE_MAX)
|
|
return -EINVAL;
|
|
cmd->scmd.data_len = 9 + cmd->info.datalen;
|
|
}
|
|
|
|
DPRINTK("SMU: i2c enqueuing command\n");
|
|
DPRINTK("SMU: %s, len=%d bus=%x addr=%x sub0=%x type=%x\n",
|
|
cmd->read ? "read" : "write", cmd->info.datalen,
|
|
cmd->info.bus, cmd->info.caddr,
|
|
cmd->info.subaddr[0], cmd->info.type);
|
|
|
|
|
|
/* Enqueue command in i2c list, and if empty, enqueue also in
|
|
* main command list
|
|
*/
|
|
spin_lock_irqsave(&smu->lock, flags);
|
|
if (smu->cmd_i2c_cur == NULL) {
|
|
smu->cmd_i2c_cur = cmd;
|
|
list_add_tail(&cmd->scmd.link, &smu->cmd_list);
|
|
if (smu->cmd_cur == NULL)
|
|
smu_start_cmd();
|
|
} else
|
|
list_add_tail(&cmd->link, &smu->cmd_i2c_list);
|
|
spin_unlock_irqrestore(&smu->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Handling of "partitions"
|
|
*/
|
|
|
|
static int smu_read_datablock(u8 *dest, unsigned int addr, unsigned int len)
|
|
{
|
|
DECLARE_COMPLETION_ONSTACK(comp);
|
|
unsigned int chunk;
|
|
struct smu_cmd cmd;
|
|
int rc;
|
|
u8 params[8];
|
|
|
|
/* We currently use a chunk size of 0xe. We could check the
|
|
* SMU firmware version and use bigger sizes though
|
|
*/
|
|
chunk = 0xe;
|
|
|
|
while (len) {
|
|
unsigned int clen = min(len, chunk);
|
|
|
|
cmd.cmd = SMU_CMD_MISC_ee_COMMAND;
|
|
cmd.data_len = 7;
|
|
cmd.data_buf = params;
|
|
cmd.reply_len = chunk;
|
|
cmd.reply_buf = dest;
|
|
cmd.done = smu_done_complete;
|
|
cmd.misc = ∁
|
|
params[0] = SMU_CMD_MISC_ee_GET_DATABLOCK_REC;
|
|
params[1] = 0x4;
|
|
*((u32 *)¶ms[2]) = addr;
|
|
params[6] = clen;
|
|
|
|
rc = smu_queue_cmd(&cmd);
|
|
if (rc)
|
|
return rc;
|
|
wait_for_completion(&comp);
|
|
if (cmd.status != 0)
|
|
return rc;
|
|
if (cmd.reply_len != clen) {
|
|
printk(KERN_DEBUG "SMU: short read in "
|
|
"smu_read_datablock, got: %d, want: %d\n",
|
|
cmd.reply_len, clen);
|
|
return -EIO;
|
|
}
|
|
len -= clen;
|
|
addr += clen;
|
|
dest += clen;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct smu_sdbp_header *smu_create_sdb_partition(int id)
|
|
{
|
|
DECLARE_COMPLETION_ONSTACK(comp);
|
|
struct smu_simple_cmd cmd;
|
|
unsigned int addr, len, tlen;
|
|
struct smu_sdbp_header *hdr;
|
|
struct property *prop;
|
|
|
|
/* First query the partition info */
|
|
DPRINTK("SMU: Query partition infos ... (irq=%d)\n", smu->db_irq);
|
|
smu_queue_simple(&cmd, SMU_CMD_PARTITION_COMMAND, 2,
|
|
smu_done_complete, &comp,
|
|
SMU_CMD_PARTITION_LATEST, id);
|
|
wait_for_completion(&comp);
|
|
DPRINTK("SMU: done, status: %d, reply_len: %d\n",
|
|
cmd.cmd.status, cmd.cmd.reply_len);
|
|
|
|
/* Partition doesn't exist (or other error) */
|
|
if (cmd.cmd.status != 0 || cmd.cmd.reply_len != 6)
|
|
return NULL;
|
|
|
|
/* Fetch address and length from reply */
|
|
addr = *((u16 *)cmd.buffer);
|
|
len = cmd.buffer[3] << 2;
|
|
/* Calucluate total length to allocate, including the 17 bytes
|
|
* for "sdb-partition-XX" that we append at the end of the buffer
|
|
*/
|
|
tlen = sizeof(struct property) + len + 18;
|
|
|
|
prop = kzalloc(tlen, GFP_KERNEL);
|
|
if (prop == NULL)
|
|
return NULL;
|
|
hdr = (struct smu_sdbp_header *)(prop + 1);
|
|
prop->name = ((char *)prop) + tlen - 18;
|
|
sprintf(prop->name, "sdb-partition-%02x", id);
|
|
prop->length = len;
|
|
prop->value = hdr;
|
|
prop->next = NULL;
|
|
|
|
/* Read the datablock */
|
|
if (smu_read_datablock((u8 *)hdr, addr, len)) {
|
|
printk(KERN_DEBUG "SMU: datablock read failed while reading "
|
|
"partition %02x !\n", id);
|
|
goto failure;
|
|
}
|
|
|
|
/* Got it, check a few things and create the property */
|
|
if (hdr->id != id) {
|
|
printk(KERN_DEBUG "SMU: Reading partition %02x and got "
|
|
"%02x !\n", id, hdr->id);
|
|
goto failure;
|
|
}
|
|
if (of_add_property(smu->of_node, prop)) {
|
|
printk(KERN_DEBUG "SMU: Failed creating sdb-partition-%02x "
|
|
"property !\n", id);
|
|
goto failure;
|
|
}
|
|
|
|
return hdr;
|
|
failure:
|
|
kfree(prop);
|
|
return NULL;
|
|
}
|
|
|
|
/* Note: Only allowed to return error code in pointers (using ERR_PTR)
|
|
* when interruptible is 1
|
|
*/
|
|
static const struct smu_sdbp_header *__smu_get_sdb_partition(int id,
|
|
unsigned int *size, int interruptible)
|
|
{
|
|
char pname[32];
|
|
const struct smu_sdbp_header *part;
|
|
|
|
if (!smu)
|
|
return NULL;
|
|
|
|
sprintf(pname, "sdb-partition-%02x", id);
|
|
|
|
DPRINTK("smu_get_sdb_partition(%02x)\n", id);
|
|
|
|
if (interruptible) {
|
|
int rc;
|
|
rc = mutex_lock_interruptible(&smu_part_access);
|
|
if (rc)
|
|
return ERR_PTR(rc);
|
|
} else
|
|
mutex_lock(&smu_part_access);
|
|
|
|
part = of_get_property(smu->of_node, pname, size);
|
|
if (part == NULL) {
|
|
DPRINTK("trying to extract from SMU ...\n");
|
|
part = smu_create_sdb_partition(id);
|
|
if (part != NULL && size)
|
|
*size = part->len << 2;
|
|
}
|
|
mutex_unlock(&smu_part_access);
|
|
return part;
|
|
}
|
|
|
|
const struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size)
|
|
{
|
|
return __smu_get_sdb_partition(id, size, 0);
|
|
}
|
|
EXPORT_SYMBOL(smu_get_sdb_partition);
|
|
|
|
|
|
/*
|
|
* Userland driver interface
|
|
*/
|
|
|
|
|
|
static LIST_HEAD(smu_clist);
|
|
static DEFINE_SPINLOCK(smu_clist_lock);
|
|
|
|
enum smu_file_mode {
|
|
smu_file_commands,
|
|
smu_file_events,
|
|
smu_file_closing
|
|
};
|
|
|
|
struct smu_private
|
|
{
|
|
struct list_head list;
|
|
enum smu_file_mode mode;
|
|
int busy;
|
|
struct smu_cmd cmd;
|
|
spinlock_t lock;
|
|
wait_queue_head_t wait;
|
|
u8 buffer[SMU_MAX_DATA];
|
|
};
|
|
|
|
|
|
static int smu_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct smu_private *pp;
|
|
unsigned long flags;
|
|
|
|
pp = kzalloc(sizeof(struct smu_private), GFP_KERNEL);
|
|
if (pp == 0)
|
|
return -ENOMEM;
|
|
spin_lock_init(&pp->lock);
|
|
pp->mode = smu_file_commands;
|
|
init_waitqueue_head(&pp->wait);
|
|
|
|
mutex_lock(&smu_mutex);
|
|
spin_lock_irqsave(&smu_clist_lock, flags);
|
|
list_add(&pp->list, &smu_clist);
|
|
spin_unlock_irqrestore(&smu_clist_lock, flags);
|
|
file->private_data = pp;
|
|
mutex_unlock(&smu_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void smu_user_cmd_done(struct smu_cmd *cmd, void *misc)
|
|
{
|
|
struct smu_private *pp = misc;
|
|
|
|
wake_up_all(&pp->wait);
|
|
}
|
|
|
|
|
|
static ssize_t smu_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct smu_private *pp = file->private_data;
|
|
unsigned long flags;
|
|
struct smu_user_cmd_hdr hdr;
|
|
int rc = 0;
|
|
|
|
if (pp->busy)
|
|
return -EBUSY;
|
|
else if (copy_from_user(&hdr, buf, sizeof(hdr)))
|
|
return -EFAULT;
|
|
else if (hdr.cmdtype == SMU_CMDTYPE_WANTS_EVENTS) {
|
|
pp->mode = smu_file_events;
|
|
return 0;
|
|
} else if (hdr.cmdtype == SMU_CMDTYPE_GET_PARTITION) {
|
|
const struct smu_sdbp_header *part;
|
|
part = __smu_get_sdb_partition(hdr.cmd, NULL, 1);
|
|
if (part == NULL)
|
|
return -EINVAL;
|
|
else if (IS_ERR(part))
|
|
return PTR_ERR(part);
|
|
return 0;
|
|
} else if (hdr.cmdtype != SMU_CMDTYPE_SMU)
|
|
return -EINVAL;
|
|
else if (pp->mode != smu_file_commands)
|
|
return -EBADFD;
|
|
else if (hdr.data_len > SMU_MAX_DATA)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&pp->lock, flags);
|
|
if (pp->busy) {
|
|
spin_unlock_irqrestore(&pp->lock, flags);
|
|
return -EBUSY;
|
|
}
|
|
pp->busy = 1;
|
|
pp->cmd.status = 1;
|
|
spin_unlock_irqrestore(&pp->lock, flags);
|
|
|
|
if (copy_from_user(pp->buffer, buf + sizeof(hdr), hdr.data_len)) {
|
|
pp->busy = 0;
|
|
return -EFAULT;
|
|
}
|
|
|
|
pp->cmd.cmd = hdr.cmd;
|
|
pp->cmd.data_len = hdr.data_len;
|
|
pp->cmd.reply_len = SMU_MAX_DATA;
|
|
pp->cmd.data_buf = pp->buffer;
|
|
pp->cmd.reply_buf = pp->buffer;
|
|
pp->cmd.done = smu_user_cmd_done;
|
|
pp->cmd.misc = pp;
|
|
rc = smu_queue_cmd(&pp->cmd);
|
|
if (rc < 0)
|
|
return rc;
|
|
return count;
|
|
}
|
|
|
|
|
|
static ssize_t smu_read_command(struct file *file, struct smu_private *pp,
|
|
char __user *buf, size_t count)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
struct smu_user_reply_hdr hdr;
|
|
unsigned long flags;
|
|
int size, rc = 0;
|
|
|
|
if (!pp->busy)
|
|
return 0;
|
|
if (count < sizeof(struct smu_user_reply_hdr))
|
|
return -EOVERFLOW;
|
|
spin_lock_irqsave(&pp->lock, flags);
|
|
if (pp->cmd.status == 1) {
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
spin_unlock_irqrestore(&pp->lock, flags);
|
|
return -EAGAIN;
|
|
}
|
|
add_wait_queue(&pp->wait, &wait);
|
|
for (;;) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
rc = 0;
|
|
if (pp->cmd.status != 1)
|
|
break;
|
|
rc = -ERESTARTSYS;
|
|
if (signal_pending(current))
|
|
break;
|
|
spin_unlock_irqrestore(&pp->lock, flags);
|
|
schedule();
|
|
spin_lock_irqsave(&pp->lock, flags);
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&pp->wait, &wait);
|
|
}
|
|
spin_unlock_irqrestore(&pp->lock, flags);
|
|
if (rc)
|
|
return rc;
|
|
if (pp->cmd.status != 0)
|
|
pp->cmd.reply_len = 0;
|
|
size = sizeof(hdr) + pp->cmd.reply_len;
|
|
if (count < size)
|
|
size = count;
|
|
rc = size;
|
|
hdr.status = pp->cmd.status;
|
|
hdr.reply_len = pp->cmd.reply_len;
|
|
if (copy_to_user(buf, &hdr, sizeof(hdr)))
|
|
return -EFAULT;
|
|
size -= sizeof(hdr);
|
|
if (size && copy_to_user(buf + sizeof(hdr), pp->buffer, size))
|
|
return -EFAULT;
|
|
pp->busy = 0;
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
static ssize_t smu_read_events(struct file *file, struct smu_private *pp,
|
|
char __user *buf, size_t count)
|
|
{
|
|
/* Not implemented */
|
|
msleep_interruptible(1000);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static ssize_t smu_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct smu_private *pp = file->private_data;
|
|
|
|
if (pp->mode == smu_file_commands)
|
|
return smu_read_command(file, pp, buf, count);
|
|
if (pp->mode == smu_file_events)
|
|
return smu_read_events(file, pp, buf, count);
|
|
|
|
return -EBADFD;
|
|
}
|
|
|
|
static __poll_t smu_fpoll(struct file *file, poll_table *wait)
|
|
{
|
|
struct smu_private *pp = file->private_data;
|
|
__poll_t mask = 0;
|
|
unsigned long flags;
|
|
|
|
if (pp == 0)
|
|
return 0;
|
|
|
|
if (pp->mode == smu_file_commands) {
|
|
poll_wait(file, &pp->wait, wait);
|
|
|
|
spin_lock_irqsave(&pp->lock, flags);
|
|
if (pp->busy && pp->cmd.status != 1)
|
|
mask |= EPOLLIN;
|
|
spin_unlock_irqrestore(&pp->lock, flags);
|
|
}
|
|
if (pp->mode == smu_file_events) {
|
|
/* Not yet implemented */
|
|
}
|
|
return mask;
|
|
}
|
|
|
|
static int smu_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct smu_private *pp = file->private_data;
|
|
unsigned long flags;
|
|
unsigned int busy;
|
|
|
|
if (pp == 0)
|
|
return 0;
|
|
|
|
file->private_data = NULL;
|
|
|
|
/* Mark file as closing to avoid races with new request */
|
|
spin_lock_irqsave(&pp->lock, flags);
|
|
pp->mode = smu_file_closing;
|
|
busy = pp->busy;
|
|
|
|
/* Wait for any pending request to complete */
|
|
if (busy && pp->cmd.status == 1) {
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
add_wait_queue(&pp->wait, &wait);
|
|
for (;;) {
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
if (pp->cmd.status != 1)
|
|
break;
|
|
spin_unlock_irqrestore(&pp->lock, flags);
|
|
schedule();
|
|
spin_lock_irqsave(&pp->lock, flags);
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&pp->wait, &wait);
|
|
}
|
|
spin_unlock_irqrestore(&pp->lock, flags);
|
|
|
|
spin_lock_irqsave(&smu_clist_lock, flags);
|
|
list_del(&pp->list);
|
|
spin_unlock_irqrestore(&smu_clist_lock, flags);
|
|
kfree(pp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static const struct file_operations smu_device_fops = {
|
|
.llseek = no_llseek,
|
|
.read = smu_read,
|
|
.write = smu_write,
|
|
.poll = smu_fpoll,
|
|
.open = smu_open,
|
|
.release = smu_release,
|
|
};
|
|
|
|
static struct miscdevice pmu_device = {
|
|
MISC_DYNAMIC_MINOR, "smu", &smu_device_fops
|
|
};
|
|
|
|
static int smu_device_init(void)
|
|
{
|
|
if (!smu)
|
|
return -ENODEV;
|
|
if (misc_register(&pmu_device) < 0)
|
|
printk(KERN_ERR "via-pmu: cannot register misc device.\n");
|
|
return 0;
|
|
}
|
|
device_initcall(smu_device_init);
|