--- /dev/null
+/* arch/arm/mach-msm/smd.c
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Author: Brian Swetland <swetland@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+
+#include <mach/msm_smd.h>
+#include <mach/msm_iomap.h>
+#include <mach/system.h>
+
+#include "smd_private.h"
+#include "proc_comm.h"
+
+void (*msm_hw_reset_hook)(void);
+
+#define MODULE_NAME "msm_smd"
+
+enum {
+ MSM_SMD_DEBUG = 1U << 0,
+ MSM_SMSM_DEBUG = 1U << 0,
+};
+
+static int msm_smd_debug_mask;
+
+module_param_named(debug_mask, msm_smd_debug_mask,
+ int, S_IRUGO | S_IWUSR | S_IWGRP);
+
+void *smem_find(unsigned id, unsigned size);
+static void smd_diag(void);
+
+static unsigned last_heap_free = 0xffffffff;
+
+#define MSM_A2M_INT(n) (MSM_CSR_BASE + 0x400 + (n) * 4)
+
+static inline void notify_other_smsm(void)
+{
+ writel(1, MSM_A2M_INT(5));
+}
+
+static inline void notify_other_smd(void)
+{
+ writel(1, MSM_A2M_INT(0));
+}
+
+static void smd_diag(void)
+{
+ char *x;
+
+ x = smem_find(ID_DIAG_ERR_MSG, SZ_DIAG_ERR_MSG);
+ if (x != 0) {
+ x[SZ_DIAG_ERR_MSG - 1] = 0;
+ pr_info("smem: DIAG '%s'\n", x);
+ }
+}
+
+/* call when SMSM_RESET flag is set in the A9's smsm_state */
+static void handle_modem_crash(void)
+{
+ pr_err("ARM9 has CRASHED\n");
+ smd_diag();
+
+ /* hard reboot if possible */
+ if (msm_hw_reset_hook)
+ msm_hw_reset_hook();
+
+ /* in this case the modem or watchdog should reboot us */
+ for (;;)
+ ;
+}
+
+extern int (*msm_check_for_modem_crash)(void);
+
+static int check_for_modem_crash(void)
+{
+ struct smsm_shared *smsm;
+
+ smsm = smem_find(ID_SHARED_STATE, 2 * sizeof(struct smsm_shared));
+
+ /* if the modem's not ready yet, we have to hope for the best */
+ if (!smsm)
+ return 0;
+
+ if (smsm[1].state & SMSM_RESET) {
+ handle_modem_crash();
+ return -1;
+ } else {
+ return 0;
+ }
+}
+
+#define SMD_SS_CLOSED 0x00000000
+#define SMD_SS_OPENING 0x00000001
+#define SMD_SS_OPENED 0x00000002
+#define SMD_SS_FLUSHING 0x00000003
+#define SMD_SS_CLOSING 0x00000004
+#define SMD_SS_RESET 0x00000005
+#define SMD_SS_RESET_OPENING 0x00000006
+
+#define SMD_BUF_SIZE 8192
+#define SMD_CHANNELS 64
+
+#define SMD_HEADER_SIZE 20
+
+
+/* the spinlock is used to synchronize between the
+** irq handler and code that mutates the channel
+** list or fiddles with channel state
+*/
+static DEFINE_SPINLOCK(smd_lock);
+static DEFINE_SPINLOCK(smem_lock);
+
+/* the mutex is used during open() and close()
+** operations to avoid races while creating or
+** destroying smd_channel structures
+*/
+static DEFINE_MUTEX(smd_creation_mutex);
+
+static int smd_initialized;
+
+struct smd_alloc_elm {
+ char name[20];
+ uint32_t cid;
+ uint32_t ctype;
+ uint32_t ref_count;
+};
+
+struct smd_half_channel {
+ unsigned state;
+ unsigned char fDSR;
+ unsigned char fCTS;
+ unsigned char fCD;
+ unsigned char fRI;
+ unsigned char fHEAD;
+ unsigned char fTAIL;
+ unsigned char fSTATE;
+ unsigned char fUNUSED;
+ unsigned tail;
+ unsigned head;
+ unsigned char data[SMD_BUF_SIZE];
+};
+
+struct smd_shared {
+ struct smd_half_channel ch0;
+ struct smd_half_channel ch1;
+};
+
+struct smd_channel {
+ volatile struct smd_half_channel *send;
+ volatile struct smd_half_channel *recv;
+ struct list_head ch_list;
+
+ unsigned current_packet;
+ unsigned n;
+ void *priv;
+ void (*notify)(void *priv, unsigned flags);
+
+ int (*read)(smd_channel_t *ch, void *data, int len);
+ int (*write)(smd_channel_t *ch, const void *data, int len);
+ int (*read_avail)(smd_channel_t *ch);
+ int (*write_avail)(smd_channel_t *ch);
+
+ void (*update_state)(smd_channel_t *ch);
+ unsigned last_state;
+
+ char name[32];
+ struct platform_device pdev;
+};
+
+static LIST_HEAD(smd_ch_closed_list);
+static LIST_HEAD(smd_ch_list);
+
+static unsigned char smd_ch_allocated[64];
+static struct work_struct probe_work;
+
+static void smd_alloc_channel(const char *name, uint32_t cid, uint32_t type);
+
+static void smd_channel_probe_worker(struct work_struct *work)
+{
+ struct smd_alloc_elm *shared;
+ unsigned n;
+
+ shared = smem_find(ID_CH_ALLOC_TBL, sizeof(*shared) * 64);
+
+ for (n = 0; n < 64; n++) {
+ if (smd_ch_allocated[n])
+ continue;
+ if (!shared[n].ref_count)
+ continue;
+ if (!shared[n].name[0])
+ continue;
+ smd_alloc_channel(shared[n].name,
+ shared[n].cid,
+ shared[n].ctype);
+ smd_ch_allocated[n] = 1;
+ }
+}
+
+static char *chstate(unsigned n)
+{
+ switch (n) {
+ case SMD_SS_CLOSED:
+ return "CLOSED";
+ case SMD_SS_OPENING:
+ return "OPENING";
+ case SMD_SS_OPENED:
+ return "OPENED";
+ case SMD_SS_FLUSHING:
+ return "FLUSHING";
+ case SMD_SS_CLOSING:
+ return "CLOSING";
+ case SMD_SS_RESET:
+ return "RESET";
+ case SMD_SS_RESET_OPENING:
+ return "ROPENING";
+ default:
+ return "UNKNOWN";
+ }
+}
+
+/* how many bytes are available for reading */
+static int smd_stream_read_avail(struct smd_channel *ch)
+{
+ return (ch->recv->head - ch->recv->tail) & (SMD_BUF_SIZE - 1);
+}
+
+/* how many bytes we are free to write */
+static int smd_stream_write_avail(struct smd_channel *ch)
+{
+ return (SMD_BUF_SIZE - 1) -
+ ((ch->send->head - ch->send->tail) & (SMD_BUF_SIZE - 1));
+}
+
+static int smd_packet_read_avail(struct smd_channel *ch)
+{
+ if (ch->current_packet) {
+ int n = smd_stream_read_avail(ch);
+ if (n > ch->current_packet)
+ n = ch->current_packet;
+ return n;
+ } else {
+ return 0;
+ }
+}
+
+static int smd_packet_write_avail(struct smd_channel *ch)
+{
+ int n = smd_stream_write_avail(ch);
+ return n > SMD_HEADER_SIZE ? n - SMD_HEADER_SIZE : 0;
+}
+
+static int ch_is_open(struct smd_channel *ch)
+{
+ return (ch->recv->state == SMD_SS_OPENED) &&
+ (ch->send->state == SMD_SS_OPENED);
+}
+
+/* provide a pointer and length to readable data in the fifo */
+static unsigned ch_read_buffer(struct smd_channel *ch, void **ptr)
+{
+ unsigned head = ch->recv->head;
+ unsigned tail = ch->recv->tail;
+ *ptr = (void *) (ch->recv->data + tail);
+
+ if (tail <= head)
+ return head - tail;
+ else
+ return SMD_BUF_SIZE - tail;
+}
+
+/* advance the fifo read pointer after data from ch_read_buffer is consumed */
+static void ch_read_done(struct smd_channel *ch, unsigned count)
+{
+ BUG_ON(count > smd_stream_read_avail(ch));
+ ch->recv->tail = (ch->recv->tail + count) & (SMD_BUF_SIZE - 1);
+ ch->recv->fTAIL = 1;
+}
+
+/* basic read interface to ch_read_{buffer,done} used
+** by smd_*_read() and update_packet_state()
+** will read-and-discard if the _data pointer is null
+*/
+static int ch_read(struct smd_channel *ch, void *_data, int len)
+{
+ void *ptr;
+ unsigned n;
+ unsigned char *data = _data;
+ int orig_len = len;
+
+ while (len > 0) {
+ n = ch_read_buffer(ch, &ptr);
+ if (n == 0)
+ break;
+
+ if (n > len)
+ n = len;
+ if (_data)
+ memcpy(data, ptr, n);
+
+ data += n;
+ len -= n;
+ ch_read_done(ch, n);
+ }
+
+ return orig_len - len;
+}
+
+static void update_stream_state(struct smd_channel *ch)
+{
+ /* streams have no special state requiring updating */
+}
+
+static void update_packet_state(struct smd_channel *ch)
+{
+ unsigned hdr[5];
+ int r;
+
+ /* can't do anything if we're in the middle of a packet */
+ if (ch->current_packet != 0)
+ return;
+
+ /* don't bother unless we can get the full header */
+ if (smd_stream_read_avail(ch) < SMD_HEADER_SIZE)
+ return;
+
+ r = ch_read(ch, hdr, SMD_HEADER_SIZE);
+ BUG_ON(r != SMD_HEADER_SIZE);
+
+ ch->current_packet = hdr[0];
+}
+
+/* provide a pointer and length to next free space in the fifo */
+static unsigned ch_write_buffer(struct smd_channel *ch, void **ptr)
+{
+ unsigned head = ch->send->head;
+ unsigned tail = ch->send->tail;
+ *ptr = (void *) (ch->send->data + head);
+
+ if (head < tail) {
+ return tail - head - 1;
+ } else {
+ if (tail == 0)
+ return SMD_BUF_SIZE - head - 1;
+ else
+ return SMD_BUF_SIZE - head;
+ }
+}
+
+/* advace the fifo write pointer after freespace
+ * from ch_write_buffer is filled
+ */
+static void ch_write_done(struct smd_channel *ch, unsigned count)
+{
+ BUG_ON(count > smd_stream_write_avail(ch));
+ ch->send->head = (ch->send->head + count) & (SMD_BUF_SIZE - 1);
+ ch->send->fHEAD = 1;
+}
+
+static void hc_set_state(volatile struct smd_half_channel *hc, unsigned n)
+{
+ if (n == SMD_SS_OPENED) {
+ hc->fDSR = 1;
+ hc->fCTS = 1;
+ hc->fCD = 1;
+ } else {
+ hc->fDSR = 0;
+ hc->fCTS = 0;
+ hc->fCD = 0;
+ }
+ hc->state = n;
+ hc->fSTATE = 1;
+ notify_other_smd();
+}
+
+static void do_smd_probe(void)
+{
+ struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE;
+ if (shared->heap_info.free_offset != last_heap_free) {
+ last_heap_free = shared->heap_info.free_offset;
+ schedule_work(&probe_work);
+ }
+}
+
+static void smd_state_change(struct smd_channel *ch,
+ unsigned last, unsigned next)
+{
+ ch->last_state = next;
+
+ pr_info("SMD: ch %d %s -> %s\n", ch->n,
+ chstate(last), chstate(next));
+
+ switch (next) {
+ case SMD_SS_OPENING:
+ ch->recv->tail = 0;
+ case SMD_SS_OPENED:
+ if (ch->send->state != SMD_SS_OPENED)
+ hc_set_state(ch->send, SMD_SS_OPENED);
+ ch->notify(ch->priv, SMD_EVENT_OPEN);
+ break;
+ case SMD_SS_FLUSHING:
+ case SMD_SS_RESET:
+ /* we should force them to close? */
+ default:
+ ch->notify(ch->priv, SMD_EVENT_CLOSE);
+ }
+}
+
+static irqreturn_t smd_irq_handler(int irq, void *data)
+{
+ unsigned long flags;
+ struct smd_channel *ch;
+ int do_notify = 0;
+ unsigned ch_flags;
+ unsigned tmp;
+
+ spin_lock_irqsave(&smd_lock, flags);
+ list_for_each_entry(ch, &smd_ch_list, ch_list) {
+ ch_flags = 0;
+ if (ch_is_open(ch)) {
+ if (ch->recv->fHEAD) {
+ ch->recv->fHEAD = 0;
+ ch_flags |= 1;
+ do_notify |= 1;
+ }
+ if (ch->recv->fTAIL) {
+ ch->recv->fTAIL = 0;
+ ch_flags |= 2;
+ do_notify |= 1;
+ }
+ if (ch->recv->fSTATE) {
+ ch->recv->fSTATE = 0;
+ ch_flags |= 4;
+ do_notify |= 1;
+ }
+ }
+ tmp = ch->recv->state;
+ if (tmp != ch->last_state)
+ smd_state_change(ch, ch->last_state, tmp);
+ if (ch_flags) {
+ ch->update_state(ch);
+ ch->notify(ch->priv, SMD_EVENT_DATA);
+ }
+ }
+ if (do_notify)
+ notify_other_smd();
+ spin_unlock_irqrestore(&smd_lock, flags);
+ do_smd_probe();
+ return IRQ_HANDLED;
+}
+
+static void smd_fake_irq_handler(unsigned long arg)
+{
+ smd_irq_handler(0, NULL);
+}
+
+static DECLARE_TASKLET(smd_fake_irq_tasklet, smd_fake_irq_handler, 0);
+
+void smd_sleep_exit(void)
+{
+ unsigned long flags;
+ struct smd_channel *ch;
+ unsigned tmp;
+ int need_int = 0;
+
+ spin_lock_irqsave(&smd_lock, flags);
+ list_for_each_entry(ch, &smd_ch_list, ch_list) {
+ if (ch_is_open(ch)) {
+ if (ch->recv->fHEAD) {
+ if (msm_smd_debug_mask & MSM_SMD_DEBUG)
+ pr_info("smd_sleep_exit ch %d fHEAD "
+ "%x %x %x\n",
+ ch->n, ch->recv->fHEAD,
+ ch->recv->head, ch->recv->tail);
+ need_int = 1;
+ break;
+ }
+ if (ch->recv->fTAIL) {
+ if (msm_smd_debug_mask & MSM_SMD_DEBUG)
+ pr_info("smd_sleep_exit ch %d fTAIL "
+ "%x %x %x\n",
+ ch->n, ch->recv->fTAIL,
+ ch->send->head, ch->send->tail);
+ need_int = 1;
+ break;
+ }
+ if (ch->recv->fSTATE) {
+ if (msm_smd_debug_mask & MSM_SMD_DEBUG)
+ pr_info("smd_sleep_exit ch %d fSTATE %x"
+ "\n", ch->n, ch->recv->fSTATE);
+ need_int = 1;
+ break;
+ }
+ tmp = ch->recv->state;
+ if (tmp != ch->last_state) {
+ if (msm_smd_debug_mask & MSM_SMD_DEBUG)
+ pr_info("smd_sleep_exit ch %d "
+ "state %x != %x\n",
+ ch->n, tmp, ch->last_state);
+ need_int = 1;
+ break;
+ }
+ }
+ }
+ spin_unlock_irqrestore(&smd_lock, flags);
+ do_smd_probe();
+ if (need_int) {
+ if (msm_smd_debug_mask & MSM_SMD_DEBUG)
+ pr_info("smd_sleep_exit need interrupt\n");
+ tasklet_schedule(&smd_fake_irq_tasklet);
+ }
+}
+
+
+void smd_kick(smd_channel_t *ch)
+{
+ unsigned long flags;
+ unsigned tmp;
+
+ spin_lock_irqsave(&smd_lock, flags);
+ ch->update_state(ch);
+ tmp = ch->recv->state;
+ if (tmp != ch->last_state) {
+ ch->last_state = tmp;
+ if (tmp == SMD_SS_OPENED)
+ ch->notify(ch->priv, SMD_EVENT_OPEN);
+ else
+ ch->notify(ch->priv, SMD_EVENT_CLOSE);
+ }
+ ch->notify(ch->priv, SMD_EVENT_DATA);
+ notify_other_smd();
+ spin_unlock_irqrestore(&smd_lock, flags);
+}
+
+static int smd_is_packet(int chn)
+{
+ if ((chn > 4) || (chn == 1))
+ return 1;
+ else
+ return 0;
+}
+
+static int smd_stream_write(smd_channel_t *ch, const void *_data, int len)
+{
+ void *ptr;
+ const unsigned char *buf = _data;
+ unsigned xfer;
+ int orig_len = len;
+
+ if (len < 0)
+ return -EINVAL;
+
+ while ((xfer = ch_write_buffer(ch, &ptr)) != 0) {
+ if (!ch_is_open(ch))
+ break;
+ if (xfer > len)
+ xfer = len;
+ memcpy(ptr, buf, xfer);
+ ch_write_done(ch, xfer);
+ len -= xfer;
+ buf += xfer;
+ if (len == 0)
+ break;
+ }
+
+ notify_other_smd();
+
+ return orig_len - len;
+}
+
+static int smd_packet_write(smd_channel_t *ch, const void *_data, int len)
+{
+ unsigned hdr[5];
+
+ if (len < 0)
+ return -EINVAL;
+
+ if (smd_stream_write_avail(ch) < (len + SMD_HEADER_SIZE))
+ return -ENOMEM;
+
+ hdr[0] = len;
+ hdr[1] = hdr[2] = hdr[3] = hdr[4] = 0;
+
+ smd_stream_write(ch, hdr, sizeof(hdr));
+ smd_stream_write(ch, _data, len);
+
+ return len;
+}
+
+static int smd_stream_read(smd_channel_t *ch, void *data, int len)
+{
+ int r;
+
+ if (len < 0)
+ return -EINVAL;
+
+ r = ch_read(ch, data, len);
+ if (r > 0)
+ notify_other_smd();
+
+ return r;
+}
+
+static int smd_packet_read(smd_channel_t *ch, void *data, int len)
+{
+ unsigned long flags;
+ int r;
+
+ if (len < 0)
+ return -EINVAL;
+
+ if (len > ch->current_packet)
+ len = ch->current_packet;
+
+ r = ch_read(ch, data, len);
+ if (r > 0)
+ notify_other_smd();
+
+ spin_lock_irqsave(&smd_lock, flags);
+ ch->current_packet -= r;
+ update_packet_state(ch);
+ spin_unlock_irqrestore(&smd_lock, flags);
+
+ return r;
+}
+
+static void smd_alloc_channel(const char *name, uint32_t cid, uint32_t type)
+{
+ struct smd_channel *ch;
+ struct smd_shared *shared;
+
+ shared = smem_alloc(ID_SMD_CHANNELS + cid, sizeof(*shared));
+ if (!shared) {
+ pr_err("smd_alloc_channel() cid %d does not exist\n", cid);
+ return;
+ }
+
+ ch = kzalloc(sizeof(struct smd_channel), GFP_KERNEL);
+ if (ch == 0) {
+ pr_err("smd_alloc_channel() out of memory\n");
+ return;
+ }
+
+ ch->send = &shared->ch0;
+ ch->recv = &shared->ch1;
+ ch->n = cid;
+
+ if (smd_is_packet(cid)) {
+ ch->read = smd_packet_read;
+ ch->write = smd_packet_write;
+ ch->read_avail = smd_packet_read_avail;
+ ch->write_avail = smd_packet_write_avail;
+ ch->update_state = update_packet_state;
+ } else {
+ ch->read = smd_stream_read;
+ ch->write = smd_stream_write;
+ ch->read_avail = smd_stream_read_avail;
+ ch->write_avail = smd_stream_write_avail;
+ ch->update_state = update_stream_state;
+ }
+
+ memcpy(ch->name, "SMD_", 4);
+ memcpy(ch->name + 4, name, 20);
+ ch->name[23] = 0;
+ ch->pdev.name = ch->name;
+ ch->pdev.id = -1;
+
+ pr_info("smd_alloc_channel() '%s' cid=%d, shared=%p\n",
+ ch->name, ch->n, shared);
+
+ mutex_lock(&smd_creation_mutex);
+ list_add(&ch->ch_list, &smd_ch_closed_list);
+ mutex_unlock(&smd_creation_mutex);
+
+ platform_device_register(&ch->pdev);
+}
+
+static void do_nothing_notify(void *priv, unsigned flags)
+{
+}
+
+struct smd_channel *smd_get_channel(const char *name)
+{
+ struct smd_channel *ch;
+
+ mutex_lock(&smd_creation_mutex);
+ list_for_each_entry(ch, &smd_ch_closed_list, ch_list) {
+ if (!strcmp(name, ch->name)) {
+ list_del(&ch->ch_list);
+ mutex_unlock(&smd_creation_mutex);
+ return ch;
+ }
+ }
+ mutex_unlock(&smd_creation_mutex);
+
+ return NULL;
+}
+
+int smd_open(const char *name, smd_channel_t **_ch,
+ void *priv, void (*notify)(void *, unsigned))
+{
+ struct smd_channel *ch;
+ unsigned long flags;
+
+ if (smd_initialized == 0) {
+ pr_info("smd_open() before smd_init()\n");
+ return -ENODEV;
+ }
+
+ ch = smd_get_channel(name);
+ if (!ch)
+ return -ENODEV;
+
+ if (notify == 0)
+ notify = do_nothing_notify;
+
+ ch->notify = notify;
+ ch->current_packet = 0;
+ ch->last_state = SMD_SS_CLOSED;
+ ch->priv = priv;
+
+ *_ch = ch;
+
+ spin_lock_irqsave(&smd_lock, flags);
+ list_add(&ch->ch_list, &smd_ch_list);
+
+ /* If the remote side is CLOSING, we need to get it to
+ * move to OPENING (which we'll do by moving from CLOSED to
+ * OPENING) and then get it to move from OPENING to
+ * OPENED (by doing the same state change ourselves).
+ *
+ * Otherwise, it should be OPENING and we can move directly
+ * to OPENED so that it will follow.
+ */
+ if (ch->recv->state == SMD_SS_CLOSING) {
+ ch->send->head = 0;
+ hc_set_state(ch->send, SMD_SS_OPENING);
+ } else {
+ hc_set_state(ch->send, SMD_SS_OPENED);
+ }
+ spin_unlock_irqrestore(&smd_lock, flags);
+ smd_kick(ch);
+
+ return 0;
+}
+
+int smd_close(smd_channel_t *ch)
+{
+ unsigned long flags;
+
+ pr_info("smd_close(%p)\n", ch);
+
+ if (ch == 0)
+ return -1;
+
+ spin_lock_irqsave(&smd_lock, flags);
+ ch->notify = do_nothing_notify;
+ list_del(&ch->ch_list);
+ hc_set_state(ch->send, SMD_SS_CLOSED);
+ spin_unlock_irqrestore(&smd_lock, flags);
+
+ mutex_lock(&smd_creation_mutex);
+ list_add(&ch->ch_list, &smd_ch_closed_list);
+ mutex_unlock(&smd_creation_mutex);
+
+ return 0;
+}
+
+int smd_read(smd_channel_t *ch, void *data, int len)
+{
+ return ch->read(ch, data, len);
+}
+
+int smd_write(smd_channel_t *ch, const void *data, int len)
+{
+ return ch->write(ch, data, len);
+}
+
+int smd_read_avail(smd_channel_t *ch)
+{
+ return ch->read_avail(ch);
+}
+
+int smd_write_avail(smd_channel_t *ch)
+{
+ return ch->write_avail(ch);
+}
+
+int smd_wait_until_readable(smd_channel_t *ch, int bytes)
+{
+ return -1;
+}
+
+int smd_wait_until_writable(smd_channel_t *ch, int bytes)
+{
+ return -1;
+}
+
+int smd_cur_packet_size(smd_channel_t *ch)
+{
+ return ch->current_packet;
+}
+
+
+/* ------------------------------------------------------------------------- */
+
+void *smem_alloc(unsigned id, unsigned size)
+{
+ return smem_find(id, size);
+}
+
+static void *_smem_find(unsigned id, unsigned *size)
+{
+ struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE;
+ struct smem_heap_entry *toc = shared->heap_toc;
+
+ if (id >= SMEM_NUM_ITEMS)
+ return 0;
+
+ if (toc[id].allocated) {
+ *size = toc[id].size;
+ return (void *) (MSM_SHARED_RAM_BASE + toc[id].offset);
+ }
+
+ return 0;
+}
+
+void *smem_find(unsigned id, unsigned size_in)
+{
+ unsigned size;
+ void *ptr;
+
+ ptr = _smem_find(id, &size);
+ if (!ptr)
+ return 0;
+
+ size_in = ALIGN(size_in, 8);
+ if (size_in != size) {
+ pr_err("smem_find(%d, %d): wrong size %d\n",
+ id, size_in, size);
+ return 0;
+ }
+
+ return ptr;
+}
+
+static irqreturn_t smsm_irq_handler(int irq, void *data)
+{
+ unsigned long flags;
+ struct smsm_shared *smsm;
+
+ spin_lock_irqsave(&smem_lock, flags);
+ smsm = smem_alloc(ID_SHARED_STATE,
+ 2 * sizeof(struct smsm_shared));
+
+ if (smsm == 0) {
+ pr_info("<SM NO STATE>\n");
+ } else {
+ unsigned apps = smsm[0].state;
+ unsigned modm = smsm[1].state;
+
+ if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
+ pr_info("<SM %08x %08x>\n", apps, modm);
+ if (modm & SMSM_RESET) {
+ handle_modem_crash();
+ } else {
+ apps |= SMSM_INIT;
+ if (modm & SMSM_SMDINIT)
+ apps |= SMSM_SMDINIT;
+ if (modm & SMSM_RPCINIT)
+ apps |= SMSM_RPCINIT;
+ }
+
+ if (smsm[0].state != apps) {
+ if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
+ pr_info("<SM %08x NOTIFY>\n", apps);
+ smsm[0].state = apps;
+ do_smd_probe();
+ notify_other_smsm();
+ }
+ }
+ spin_unlock_irqrestore(&smem_lock, flags);
+ return IRQ_HANDLED;
+}
+
+int smsm_change_state(uint32_t clear_mask, uint32_t set_mask)
+{
+ unsigned long flags;
+ struct smsm_shared *smsm;
+
+ spin_lock_irqsave(&smem_lock, flags);
+
+ smsm = smem_alloc(ID_SHARED_STATE,
+ 2 * sizeof(struct smsm_shared));
+
+ if (smsm) {
+ if (smsm[1].state & SMSM_RESET)
+ handle_modem_crash();
+ smsm[0].state = (smsm[0].state & ~clear_mask) | set_mask;
+ if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
+ pr_info("smsm_change_state %x\n",
+ smsm[0].state);
+ notify_other_smsm();
+ }
+
+ spin_unlock_irqrestore(&smem_lock, flags);
+
+ if (smsm == NULL) {
+ pr_err("smsm_change_state <SM NO STATE>\n");
+ return -EIO;
+ }
+ return 0;
+}
+
+uint32_t smsm_get_state(void)
+{
+ unsigned long flags;
+ struct smsm_shared *smsm;
+ uint32_t rv;
+
+ spin_lock_irqsave(&smem_lock, flags);
+
+ smsm = smem_alloc(ID_SHARED_STATE,
+ 2 * sizeof(struct smsm_shared));
+
+ if (smsm)
+ rv = smsm[1].state;
+ else
+ rv = 0;
+
+ if (rv & SMSM_RESET)
+ handle_modem_crash();
+
+ spin_unlock_irqrestore(&smem_lock, flags);
+
+ if (smsm == NULL)
+ pr_err("smsm_get_state <SM NO STATE>\n");
+ return rv;
+}
+
+int smsm_set_sleep_duration(uint32_t delay)
+{
+ uint32_t *ptr;
+
+ ptr = smem_alloc(SMEM_SMSM_SLEEP_DELAY, sizeof(*ptr));
+ if (ptr == NULL) {
+ pr_err("smsm_set_sleep_duration <SM NO SLEEP_DELAY>\n");
+ return -EIO;
+ }
+ if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
+ pr_info("smsm_set_sleep_duration %d -> %d\n",
+ *ptr, delay);
+ *ptr = delay;
+ return 0;
+}
+
+int smsm_set_interrupt_info(struct smsm_interrupt_info *info)
+{
+ struct smsm_interrupt_info *ptr;
+
+ ptr = smem_alloc(SMEM_SMSM_INT_INFO, sizeof(*ptr));
+ if (ptr == NULL) {
+ pr_err("smsm_set_sleep_duration <SM NO INT_INFO>\n");
+ return -EIO;
+ }
+ if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
+ pr_info("smsm_set_interrupt_info %x %x -> %x %x\n",
+ ptr->aArm_en_mask, ptr->aArm_interrupts_pending,
+ info->aArm_en_mask, info->aArm_interrupts_pending);
+ *ptr = *info;
+ return 0;
+}
+
+#define MAX_NUM_SLEEP_CLIENTS 64
+#define MAX_SLEEP_NAME_LEN 8
+
+#define NUM_GPIO_INT_REGISTERS 6
+#define GPIO_SMEM_NUM_GROUPS 2
+#define GPIO_SMEM_MAX_PC_INTERRUPTS 8
+
+struct tramp_gpio_save {
+ unsigned int enable;
+ unsigned int detect;
+ unsigned int polarity;
+};
+
+struct tramp_gpio_smem {
+ uint16_t num_fired[GPIO_SMEM_NUM_GROUPS];
+ uint16_t fired[GPIO_SMEM_NUM_GROUPS][GPIO_SMEM_MAX_PC_INTERRUPTS];
+ uint32_t enabled[NUM_GPIO_INT_REGISTERS];
+ uint32_t detection[NUM_GPIO_INT_REGISTERS];
+ uint32_t polarity[NUM_GPIO_INT_REGISTERS];
+};
+
+
+void smsm_print_sleep_info(void)
+{
+ unsigned long flags;
+ uint32_t *ptr;
+ struct tramp_gpio_smem *gpio;
+ struct smsm_interrupt_info *int_info;
+
+
+ spin_lock_irqsave(&smem_lock, flags);
+
+ ptr = smem_alloc(SMEM_SMSM_SLEEP_DELAY, sizeof(*ptr));
+ if (ptr)
+ pr_info("SMEM_SMSM_SLEEP_DELAY: %x\n", *ptr);
+
+ ptr = smem_alloc(SMEM_SMSM_LIMIT_SLEEP, sizeof(*ptr));
+ if (ptr)
+ pr_info("SMEM_SMSM_LIMIT_SLEEP: %x\n", *ptr);
+
+ ptr = smem_alloc(SMEM_SLEEP_POWER_COLLAPSE_DISABLED, sizeof(*ptr));
+ if (ptr)
+ pr_info("SMEM_SLEEP_POWER_COLLAPSE_DISABLED: %x\n", *ptr);
+
+ int_info = smem_alloc(SMEM_SMSM_INT_INFO, sizeof(*int_info));
+ if (int_info)
+ pr_info("SMEM_SMSM_INT_INFO %x %x %x\n",
+ int_info->aArm_en_mask,
+ int_info->aArm_interrupts_pending,
+ int_info->aArm_wakeup_reason);
+
+ gpio = smem_alloc(SMEM_GPIO_INT, sizeof(*gpio));
+ if (gpio) {
+ int i;
+ for (i = 0; i < NUM_GPIO_INT_REGISTERS; i++)
+ pr_info("SMEM_GPIO_INT: %d: e %x d %x p %x\n",
+ i, gpio->enabled[i], gpio->detection[i],
+ gpio->polarity[i]);
+
+ for (i = 0; i < GPIO_SMEM_NUM_GROUPS; i++)
+ pr_info("SMEM_GPIO_INT: %d: f %d: %d %d...\n",
+ i, gpio->num_fired[i], gpio->fired[i][0],
+ gpio->fired[i][1]);
+ }
+
+ spin_unlock_irqrestore(&smem_lock, flags);
+}
+
+int smd_core_init(void)
+{
+ int r;
+ pr_info("smd_core_init()\n");
+
+ r = request_irq(INT_A9_M2A_0, smd_irq_handler,
+ IRQF_TRIGGER_RISING, "smd_dev", 0);
+ if (r < 0)
+ return r;
+ r = enable_irq_wake(INT_A9_M2A_0);
+ if (r < 0)
+ pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_0\n");
+
+ r = request_irq(INT_A9_M2A_5, smsm_irq_handler,
+ IRQF_TRIGGER_RISING, "smsm_dev", 0);
+ if (r < 0) {
+ free_irq(INT_A9_M2A_0, 0);
+ return r;
+ }
+ r = enable_irq_wake(INT_A9_M2A_5);
+ if (r < 0)
+ pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_5\n");
+
+ /* we may have missed a signal while booting -- fake
+ * an interrupt to make sure we process any existing
+ * state
+ */
+ smsm_irq_handler(0, 0);
+
+ pr_info("smd_core_init() done\n");
+
+ return 0;
+}
+
+#if defined(CONFIG_DEBUG_FS)
+
+static int dump_ch(char *buf, int max, int n,
+ struct smd_half_channel *s,
+ struct smd_half_channel *r)
+{
+ return scnprintf(
+ buf, max,
+ "ch%02d:"
+ " %8s(%04d/%04d) %c%c%c%c%c%c%c <->"
+ " %8s(%04d/%04d) %c%c%c%c%c%c%c\n", n,
+ chstate(s->state), s->tail, s->head,
+ s->fDSR ? 'D' : 'd',
+ s->fCTS ? 'C' : 'c',
+ s->fCD ? 'C' : 'c',
+ s->fRI ? 'I' : 'i',
+ s->fHEAD ? 'W' : 'w',
+ s->fTAIL ? 'R' : 'r',
+ s->fSTATE ? 'S' : 's',
+ chstate(r->state), r->tail, r->head,
+ r->fDSR ? 'D' : 'd',
+ r->fCTS ? 'R' : 'r',
+ r->fCD ? 'C' : 'c',
+ r->fRI ? 'I' : 'i',
+ r->fHEAD ? 'W' : 'w',
+ r->fTAIL ? 'R' : 'r',
+ r->fSTATE ? 'S' : 's'
+ );
+}
+
+static int debug_read_stat(char *buf, int max)
+{
+ struct smsm_shared *smsm;
+ char *msg;
+ int i = 0;
+
+ smsm = smem_find(ID_SHARED_STATE,
+ 2 * sizeof(struct smsm_shared));
+
+ msg = smem_find(ID_DIAG_ERR_MSG, SZ_DIAG_ERR_MSG);
+
+ if (smsm) {
+ if (smsm[1].state & SMSM_RESET)
+ i += scnprintf(buf + i, max - i,
+ "smsm: ARM9 HAS CRASHED\n");
+ i += scnprintf(buf + i, max - i, "smsm: a9: %08x a11: %08x\n",
+ smsm[0].state, smsm[1].state);
+ } else {
+ i += scnprintf(buf + i, max - i, "smsm: cannot find\n");
+ }
+ if (msg) {
+ msg[SZ_DIAG_ERR_MSG - 1] = 0;
+ i += scnprintf(buf + i, max - i, "diag: '%s'\n", msg);
+ }
+ return i;
+}
+
+static int debug_read_mem(char *buf, int max)
+{
+ unsigned n;
+ struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE;
+ struct smem_heap_entry *toc = shared->heap_toc;
+ int i = 0;
+
+ i += scnprintf(buf + i, max - i,
+ "heap: init=%d free=%d remain=%d\n",
+ shared->heap_info.initialized,
+ shared->heap_info.free_offset,
+ shared->heap_info.heap_remaining);
+
+ for (n = 0; n < SMEM_NUM_ITEMS; n++) {
+ if (toc[n].allocated == 0)
+ continue;
+ i += scnprintf(buf + i, max - i,
+ "%04d: offsed %08x size %08x\n",
+ n, toc[n].offset, toc[n].size);
+ }
+ return i;
+}
+
+static int debug_read_ch(char *buf, int max)
+{
+ struct smd_shared *shared;
+ int n, i = 0;
+
+ for (n = 0; n < SMD_CHANNELS; n++) {
+ shared = smem_find(ID_SMD_CHANNELS + n,
+ sizeof(struct smd_shared));
+ if (shared == 0)
+ continue;
+ i += dump_ch(buf + i, max - i, n, &shared->ch0, &shared->ch1);
+ }
+
+ return i;
+}
+
+static int debug_read_version(char *buf, int max)
+{
+ struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE;
+ unsigned version = shared->version[VERSION_MODEM];
+ return sprintf(buf, "%d.%d\n", version >> 16, version & 0xffff);
+}
+
+static int debug_read_build_id(char *buf, int max)
+{
+ unsigned size;
+ void *data;
+
+ data = _smem_find(SMEM_HW_SW_BUILD_ID, &size);
+ if (!data)
+ return 0;
+
+ if (size >= max)
+ size = max;
+ memcpy(buf, data, size);
+
+ return size;
+}
+
+static int debug_read_alloc_tbl(char *buf, int max)
+{
+ struct smd_alloc_elm *shared;
+ int n, i = 0;
+
+ shared = smem_find(ID_CH_ALLOC_TBL, sizeof(*shared) * 64);
+
+ for (n = 0; n < 64; n++) {
+ if (shared[n].ref_count == 0)
+ continue;
+ i += scnprintf(buf + i, max - i,
+ "%03d: %20s cid=%02d ctype=%d ref_count=%d\n",
+ n, shared[n].name, shared[n].cid,
+ shared[n].ctype, shared[n].ref_count);
+ }
+
+ return i;
+}
+
+static int debug_boom(char *buf, int max)
+{
+ unsigned ms = 5000;
+ msm_proc_comm(PCOM_RESET_MODEM, &ms, 0);
+ return 0;
+}
+
+#define DEBUG_BUFMAX 4096
+static char debug_buffer[DEBUG_BUFMAX];
+
+static ssize_t debug_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ int (*fill)(char *buf, int max) = file->private_data;
+ int bsize = fill(debug_buffer, DEBUG_BUFMAX);
+ return simple_read_from_buffer(buf, count, ppos, debug_buffer, bsize);
+}
+
+static int debug_open(struct inode *inode, struct file *file)
+{
+ file->private_data = inode->i_private;
+ return 0;
+}
+
+static const struct file_operations debug_ops = {
+ .read = debug_read,
+ .open = debug_open,
+};
+
+static void debug_create(const char *name, mode_t mode,
+ struct dentry *dent,
+ int (*fill)(char *buf, int max))
+{
+ debugfs_create_file(name, mode, dent, fill, &debug_ops);
+}
+
+static void smd_debugfs_init(void)
+{
+ struct dentry *dent;
+
+ dent = debugfs_create_dir("smd", 0);
+ if (IS_ERR(dent))
+ return;
+
+ debug_create("ch", 0444, dent, debug_read_ch);
+ debug_create("stat", 0444, dent, debug_read_stat);
+ debug_create("mem", 0444, dent, debug_read_mem);
+ debug_create("version", 0444, dent, debug_read_version);
+ debug_create("tbl", 0444, dent, debug_read_alloc_tbl);
+ debug_create("build", 0444, dent, debug_read_build_id);
+ debug_create("boom", 0444, dent, debug_boom);
+}
+#else
+static void smd_debugfs_init(void) {}
+#endif
+
+static int __init msm_smd_probe(struct platform_device *pdev)
+{
+ pr_info("smd_init()\n");
+
+ INIT_WORK(&probe_work, smd_channel_probe_worker);
+
+ if (smd_core_init()) {
+ pr_err("smd_core_init() failed\n");
+ return -1;
+ }
+
+ do_smd_probe();
+
+ msm_check_for_modem_crash = check_for_modem_crash;
+
+ smd_debugfs_init();
+ smd_initialized = 1;
+
+ return 0;
+}
+
+static struct platform_driver msm_smd_driver = {
+ .probe = msm_smd_probe,
+ .driver = {
+ .name = MODULE_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init msm_smd_init(void)
+{
+ return platform_driver_register(&msm_smd_driver);
+}
+
+module_init(msm_smd_init);
+
+MODULE_DESCRIPTION("MSM Shared Memory Core");
+MODULE_AUTHOR("Brian Swetland <swetland@google.com>");
+MODULE_LICENSE("GPL");
git.openpandora.org / pandora-kernel.git / commitdiff