1330 lines
30 KiB
C
1330 lines
30 KiB
C
/*
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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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* Released under the term of the GNU GPL v2.
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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/bootmem.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 <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 <asm/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 void smu_i2c_retry(unsigned long data);
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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_inval_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_inval_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 == NO_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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if (smu == NULL)
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return -ENODEV;
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memset(time, 0, sizeof(struct rtc_time));
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rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 1, NULL, NULL,
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SMU_CMD_RTC_GET_DATETIME);
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if (rc)
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return rc;
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smu_spinwait_simple(&cmd);
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time->tm_sec = bcd2hex(cmd.buffer[0]);
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time->tm_min = bcd2hex(cmd.buffer[1]);
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time->tm_hour = bcd2hex(cmd.buffer[2]);
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time->tm_wday = bcd2hex(cmd.buffer[3]);
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time->tm_mday = bcd2hex(cmd.buffer[4]);
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time->tm_mon = bcd2hex(cmd.buffer[5]) - 1;
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time->tm_year = bcd2hex(cmd.buffer[6]) + 100;
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return 0;
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}
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int smu_set_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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if (smu == NULL)
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return -ENODEV;
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rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 8, NULL, NULL,
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SMU_CMD_RTC_SET_DATETIME,
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hex2bcd(time->tm_sec),
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hex2bcd(time->tm_min),
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hex2bcd(time->tm_hour),
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time->tm_wday,
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hex2bcd(time->tm_mday),
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hex2bcd(time->tm_mon) + 1,
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hex2bcd(time->tm_year - 100));
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if (rc)
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return rc;
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smu_spinwait_simple(&cmd);
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return 0;
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}
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void smu_shutdown(void)
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{
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struct smu_simple_cmd cmd;
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if (smu == NULL)
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return;
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if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 9, NULL, NULL,
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'S', 'H', 'U', 'T', 'D', 'O', 'W', 'N', 0))
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return;
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smu_spinwait_simple(&cmd);
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for (;;)
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;
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}
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|
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void smu_restart(void)
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{
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struct smu_simple_cmd cmd;
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if (smu == NULL)
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return;
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if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, NULL, NULL,
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'R', 'E', 'S', 'T', 'A', 'R', 'T', 0))
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return;
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smu_spinwait_simple(&cmd);
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for (;;)
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;
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}
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|
|
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int smu_present(void)
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{
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return smu != NULL;
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}
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EXPORT_SYMBOL(smu_present);
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|
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int __init smu_init (void)
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{
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struct device_node *np;
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const u32 *data;
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int ret = 0;
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np = of_find_node_by_type(NULL, "smu");
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if (np == NULL)
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return -ENODEV;
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|
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printk(KERN_INFO "SMU: Driver %s %s\n", VERSION, AUTHOR);
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if (smu_cmdbuf_abs == 0) {
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printk(KERN_ERR "SMU: Command buffer not allocated !\n");
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ret = -EINVAL;
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goto fail_np;
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}
|
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smu = alloc_bootmem(sizeof(struct smu_device));
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|
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spin_lock_init(&smu->lock);
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INIT_LIST_HEAD(&smu->cmd_list);
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INIT_LIST_HEAD(&smu->cmd_i2c_list);
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smu->of_node = np;
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smu->db_irq = NO_IRQ;
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smu->msg_irq = NO_IRQ;
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/* smu_cmdbuf_abs is in the low 2G of RAM, can be converted to a
|
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* 32 bits value safely
|
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*/
|
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smu->cmd_buf_abs = (u32)smu_cmdbuf_abs;
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smu->cmd_buf = __va(smu_cmdbuf_abs);
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smu->db_node = of_find_node_by_name(NULL, "smu-doorbell");
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if (smu->db_node == NULL) {
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printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n");
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ret = -ENXIO;
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goto fail_bootmem;
|
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}
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data = of_get_property(smu->db_node, "reg", NULL);
|
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if (data == NULL) {
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printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n");
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ret = -ENXIO;
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goto fail_db_node;
|
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}
|
|
|
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/* Current setup has one doorbell GPIO that does both doorbell
|
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* and ack. GPIOs are at 0x50, best would be to find that out
|
|
* in the device-tree though.
|
|
*/
|
|
smu->doorbell = *data;
|
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if (smu->doorbell < 0x50)
|
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smu->doorbell += 0x50;
|
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|
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/* Now look for the smu-interrupt GPIO */
|
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do {
|
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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:
|
|
free_bootmem(__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;
|
|
|
|
init_timer(&smu->i2c_timer);
|
|
smu->i2c_timer.function = smu_i2c_retry;
|
|
smu->i2c_timer.data = (unsigned long)smu;
|
|
|
|
if (smu->db_node) {
|
|
smu->db_irq = irq_of_parse_and_map(smu->db_node, 0);
|
|
if (smu->db_irq == NO_IRQ)
|
|
printk(KERN_ERR "smu: failed to map irq for node %s\n",
|
|
smu->db_node->full_name);
|
|
}
|
|
if (smu->msg_node) {
|
|
smu->msg_irq = irq_of_parse_and_map(smu->msg_node, 0);
|
|
if (smu->msg_irq == NO_IRQ)
|
|
printk(KERN_ERR "smu: failed to map irq for node %s\n",
|
|
smu->msg_node->full_name);
|
|
}
|
|
|
|
/*
|
|
* Try to request the interrupts
|
|
*/
|
|
|
|
if (smu->db_irq != NO_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 = NO_IRQ;
|
|
}
|
|
}
|
|
|
|
if (smu->msg_irq != NO_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 = NO_IRQ;
|
|
}
|
|
}
|
|
|
|
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 (np = NULL; (np = of_get_next_child(smu->of_node, np)) != NULL;)
|
|
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(unsigned long data)
|
|
{
|
|
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(0);
|
|
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;
|
|
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
|
|
*/
|
|
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);
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|
|
|
|
|
/*
|
|
* Userland driver interface
|
|
*/
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|
|
|
|
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static LIST_HEAD(smu_clist);
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|
static DEFINE_SPINLOCK(smu_clist_lock);
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|
|
|
enum smu_file_mode {
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smu_file_commands,
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|
smu_file_events,
|
|
smu_file_closing
|
|
};
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|
|
|
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];
|
|
};
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|
|
|
|
|
static int smu_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct smu_private *pp;
|
|
unsigned long flags;
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|
|
|
pp = kzalloc(sizeof(struct smu_private), GFP_KERNEL);
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|
if (pp == 0)
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|
return -ENOMEM;
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|
spin_lock_init(&pp->lock);
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|
pp->mode = smu_file_commands;
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|
init_waitqueue_head(&pp->wait);
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|
|
|
mutex_lock(&smu_mutex);
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|
spin_lock_irqsave(&smu_clist_lock, flags);
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|
list_add(&pp->list, &smu_clist);
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|
spin_unlock_irqrestore(&smu_clist_lock, flags);
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|
file->private_data = pp;
|
|
mutex_unlock(&smu_mutex);
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|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void smu_user_cmd_done(struct smu_cmd *cmd, void *misc)
|
|
{
|
|
struct smu_private *pp = misc;
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|
|
|
wake_up_all(&pp->wait);
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|
}
|
|
|
|
|
|
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;
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|
|
|
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 unsigned int smu_fpoll(struct file *file, poll_table *wait)
|
|
{
|
|
struct smu_private *pp = file->private_data;
|
|
unsigned int 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 |= POLLIN;
|
|
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);
|