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linux/drivers/slimbus/qcom-ctrl.c
Kees Cook 6396bb2215 treewide: kzalloc() -> kcalloc() 
The kzalloc() function has a 2-factor argument form, kcalloc(). This
patch replaces cases of:

        kzalloc(a * b, gfp)

with:
        kcalloc(a * b, gfp)

as well as handling cases of:

        kzalloc(a * b * c, gfp)

with:

        kzalloc(array3_size(a, b, c), gfp)

as it's slightly less ugly than:

        kzalloc_array(array_size(a, b), c, gfp)

This does, however, attempt to ignore constant size factors like:

        kzalloc(4 * 1024, gfp)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@

(
  kzalloc(
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  kzalloc(
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  kzalloc(
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@

- kzalloc
+ kcalloc
  (
-	SIZE * COUNT
+	COUNT, SIZE
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  kzalloc(
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  kzalloc(
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kzalloc(
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@

(
  kzalloc(
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  kzalloc(C1 * C2 * C3, ...)
|
  kzalloc(
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@

(
  kzalloc(sizeof(THING) * C2, ...)
|
  kzalloc(sizeof(TYPE) * C2, ...)
|
  kzalloc(C1 * C2 * C3, ...)
|
  kzalloc(C1 * C2, ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (E2)
+	E2, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * E2
+	E2, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (E2)
+	E2, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * E2
+	E2, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	(E1) * E2
+	E1, E2
  , ...)
|
- kzalloc
+ kcalloc
  (
-	(E1) * (E2)
+	E1, E2
  , ...)
|
- kzalloc
+ kcalloc
  (
-	E1 * E2
+	E1, E2
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 16:19:22 -07:00

747 lines
18 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2011-2017, The Linux Foundation
*/
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/pm_runtime.h>
#include "slimbus.h"
/* Manager registers */
#define MGR_CFG 0x200
#define MGR_STATUS 0x204
#define MGR_INT_EN 0x210
#define MGR_INT_STAT 0x214
#define MGR_INT_CLR 0x218
#define MGR_TX_MSG 0x230
#define MGR_RX_MSG 0x270
#define MGR_IE_STAT 0x2F0
#define MGR_VE_STAT 0x300
#define MGR_CFG_ENABLE 1
/* Framer registers */
#define FRM_CFG 0x400
#define FRM_STAT 0x404
#define FRM_INT_EN 0x410
#define FRM_INT_STAT 0x414
#define FRM_INT_CLR 0x418
#define FRM_WAKEUP 0x41C
#define FRM_CLKCTL_DONE 0x420
#define FRM_IE_STAT 0x430
#define FRM_VE_STAT 0x440
/* Interface registers */
#define INTF_CFG 0x600
#define INTF_STAT 0x604
#define INTF_INT_EN 0x610
#define INTF_INT_STAT 0x614
#define INTF_INT_CLR 0x618
#define INTF_IE_STAT 0x630
#define INTF_VE_STAT 0x640
/* Interrupt status bits */
#define MGR_INT_TX_NACKED_2 BIT(25)
#define MGR_INT_MSG_BUF_CONTE BIT(26)
#define MGR_INT_RX_MSG_RCVD BIT(30)
#define MGR_INT_TX_MSG_SENT BIT(31)
/* Framer config register settings */
#define FRM_ACTIVE 1
#define CLK_GEAR 7
#define ROOT_FREQ 11
#define REF_CLK_GEAR 15
#define INTR_WAKE 19
#define SLIM_MSG_ASM_FIRST_WORD(l, mt, mc, dt, ad) \
((l) | ((mt) << 5) | ((mc) << 8) | ((dt) << 15) | ((ad) << 16))
#define SLIM_ROOT_FREQ 24576000
#define QCOM_SLIM_AUTOSUSPEND 1000
/* MAX message size over control channel */
#define SLIM_MSGQ_BUF_LEN 40
#define QCOM_TX_MSGS 2
#define QCOM_RX_MSGS 8
#define QCOM_BUF_ALLOC_RETRIES 10
#define CFG_PORT(r, v) ((v) ? CFG_PORT_V2(r) : CFG_PORT_V1(r))
/* V2 Component registers */
#define CFG_PORT_V2(r) ((r ## _V2))
#define COMP_CFG_V2 4
#define COMP_TRUST_CFG_V2 0x3000
/* V1 Component registers */
#define CFG_PORT_V1(r) ((r ## _V1))
#define COMP_CFG_V1 0
#define COMP_TRUST_CFG_V1 0x14
/* Resource group info for manager, and non-ported generic device-components */
#define EE_MGR_RSC_GRP (1 << 10)
#define EE_NGD_2 (2 << 6)
#define EE_NGD_1 0
struct slim_ctrl_buf {
void *base;
spinlock_t lock;
int head;
int tail;
int sl_sz;
int n;
};
struct qcom_slim_ctrl {
struct slim_controller ctrl;
struct slim_framer framer;
struct device *dev;
void __iomem *base;
void __iomem *slew_reg;
struct slim_ctrl_buf rx;
struct slim_ctrl_buf tx;
struct completion **wr_comp;
int irq;
struct workqueue_struct *rxwq;
struct work_struct wd;
struct clk *rclk;
struct clk *hclk;
};
static void qcom_slim_queue_tx(struct qcom_slim_ctrl *ctrl, void *buf,
u8 len, u32 tx_reg)
{
int count = (len + 3) >> 2;
__iowrite32_copy(ctrl->base + tx_reg, buf, count);
/* Ensure Oder of subsequent writes */
mb();
}
static void *slim_alloc_rxbuf(struct qcom_slim_ctrl *ctrl)
{
unsigned long flags;
int idx;
spin_lock_irqsave(&ctrl->rx.lock, flags);
if ((ctrl->rx.tail + 1) % ctrl->rx.n == ctrl->rx.head) {
spin_unlock_irqrestore(&ctrl->rx.lock, flags);
dev_err(ctrl->dev, "RX QUEUE full!");
return NULL;
}
idx = ctrl->rx.tail;
ctrl->rx.tail = (ctrl->rx.tail + 1) % ctrl->rx.n;
spin_unlock_irqrestore(&ctrl->rx.lock, flags);
return ctrl->rx.base + (idx * ctrl->rx.sl_sz);
}
static void slim_ack_txn(struct qcom_slim_ctrl *ctrl, int err)
{
struct completion *comp;
unsigned long flags;
int idx;
spin_lock_irqsave(&ctrl->tx.lock, flags);
idx = ctrl->tx.head;
ctrl->tx.head = (ctrl->tx.head + 1) % ctrl->tx.n;
spin_unlock_irqrestore(&ctrl->tx.lock, flags);
comp = ctrl->wr_comp[idx];
ctrl->wr_comp[idx] = NULL;
complete(comp);
}
static irqreturn_t qcom_slim_handle_tx_irq(struct qcom_slim_ctrl *ctrl,
u32 stat)
{
int err = 0;
if (stat & MGR_INT_TX_MSG_SENT)
writel_relaxed(MGR_INT_TX_MSG_SENT,
ctrl->base + MGR_INT_CLR);
if (stat & MGR_INT_TX_NACKED_2) {
u32 mgr_stat = readl_relaxed(ctrl->base + MGR_STATUS);
u32 mgr_ie_stat = readl_relaxed(ctrl->base + MGR_IE_STAT);
u32 frm_stat = readl_relaxed(ctrl->base + FRM_STAT);
u32 frm_cfg = readl_relaxed(ctrl->base + FRM_CFG);
u32 frm_intr_stat = readl_relaxed(ctrl->base + FRM_INT_STAT);
u32 frm_ie_stat = readl_relaxed(ctrl->base + FRM_IE_STAT);
u32 intf_stat = readl_relaxed(ctrl->base + INTF_STAT);
u32 intf_intr_stat = readl_relaxed(ctrl->base + INTF_INT_STAT);
u32 intf_ie_stat = readl_relaxed(ctrl->base + INTF_IE_STAT);
writel_relaxed(MGR_INT_TX_NACKED_2, ctrl->base + MGR_INT_CLR);
dev_err(ctrl->dev, "TX Nack MGR:int:0x%x, stat:0x%x\n",
stat, mgr_stat);
dev_err(ctrl->dev, "TX Nack MGR:ie:0x%x\n", mgr_ie_stat);
dev_err(ctrl->dev, "TX Nack FRM:int:0x%x, stat:0x%x\n",
frm_intr_stat, frm_stat);
dev_err(ctrl->dev, "TX Nack FRM:cfg:0x%x, ie:0x%x\n",
frm_cfg, frm_ie_stat);
dev_err(ctrl->dev, "TX Nack INTF:intr:0x%x, stat:0x%x\n",
intf_intr_stat, intf_stat);
dev_err(ctrl->dev, "TX Nack INTF:ie:0x%x\n",
intf_ie_stat);
err = -ENOTCONN;
}
slim_ack_txn(ctrl, err);
return IRQ_HANDLED;
}
static irqreturn_t qcom_slim_handle_rx_irq(struct qcom_slim_ctrl *ctrl,
u32 stat)
{
u32 *rx_buf, pkt[10];
bool q_rx = false;
u8 mc, mt, len;
pkt[0] = readl_relaxed(ctrl->base + MGR_RX_MSG);
mt = SLIM_HEADER_GET_MT(pkt[0]);
len = SLIM_HEADER_GET_RL(pkt[0]);
mc = SLIM_HEADER_GET_MC(pkt[0]>>8);
/*
* this message cannot be handled by ISR, so
* let work-queue handle it
*/
if (mt == SLIM_MSG_MT_CORE && mc == SLIM_MSG_MC_REPORT_PRESENT) {
rx_buf = (u32 *)slim_alloc_rxbuf(ctrl);
if (!rx_buf) {
dev_err(ctrl->dev, "dropping RX:0x%x due to RX full\n",
pkt[0]);
goto rx_ret_irq;
}
rx_buf[0] = pkt[0];
} else {
rx_buf = pkt;
}
__ioread32_copy(rx_buf + 1, ctrl->base + MGR_RX_MSG + 4,
DIV_ROUND_UP(len, 4));
switch (mc) {
case SLIM_MSG_MC_REPORT_PRESENT:
q_rx = true;
break;
case SLIM_MSG_MC_REPLY_INFORMATION:
case SLIM_MSG_MC_REPLY_VALUE:
slim_msg_response(&ctrl->ctrl, (u8 *)(rx_buf + 1),
(u8)(*rx_buf >> 24), (len - 4));
break;
default:
dev_err(ctrl->dev, "unsupported MC,%x MT:%x\n",
mc, mt);
break;
}
rx_ret_irq:
writel(MGR_INT_RX_MSG_RCVD, ctrl->base +
MGR_INT_CLR);
if (q_rx)
queue_work(ctrl->rxwq, &ctrl->wd);
return IRQ_HANDLED;
}
static irqreturn_t qcom_slim_interrupt(int irq, void *d)
{
struct qcom_slim_ctrl *ctrl = d;
u32 stat = readl_relaxed(ctrl->base + MGR_INT_STAT);
int ret = IRQ_NONE;
if (stat & MGR_INT_TX_MSG_SENT || stat & MGR_INT_TX_NACKED_2)
ret = qcom_slim_handle_tx_irq(ctrl, stat);
if (stat & MGR_INT_RX_MSG_RCVD)
ret = qcom_slim_handle_rx_irq(ctrl, stat);
return ret;
}
static int qcom_clk_pause_wakeup(struct slim_controller *sctrl)
{
struct qcom_slim_ctrl *ctrl = dev_get_drvdata(sctrl->dev);
clk_prepare_enable(ctrl->hclk);
clk_prepare_enable(ctrl->rclk);
enable_irq(ctrl->irq);
writel_relaxed(1, ctrl->base + FRM_WAKEUP);
/* Make sure framer wakeup write goes through before ISR fires */
mb();
/*
* HW Workaround: Currently, slave is reporting lost-sync messages
* after SLIMbus comes out of clock pause.
* Transaction with slave fail before slave reports that message
* Give some time for that report to come
* SLIMbus wakes up in clock gear 10 at 24.576MHz. With each superframe
* being 250 usecs, we wait for 5-10 superframes here to ensure
* we get the message
*/
usleep_range(1250, 2500);
return 0;
}
static void *slim_alloc_txbuf(struct qcom_slim_ctrl *ctrl,
struct slim_msg_txn *txn,
struct completion *done)
{
unsigned long flags;
int idx;
spin_lock_irqsave(&ctrl->tx.lock, flags);
if (((ctrl->tx.head + 1) % ctrl->tx.n) == ctrl->tx.tail) {
spin_unlock_irqrestore(&ctrl->tx.lock, flags);
dev_err(ctrl->dev, "controller TX buf unavailable");
return NULL;
}
idx = ctrl->tx.tail;
ctrl->wr_comp[idx] = done;
ctrl->tx.tail = (ctrl->tx.tail + 1) % ctrl->tx.n;
spin_unlock_irqrestore(&ctrl->tx.lock, flags);
return ctrl->tx.base + (idx * ctrl->tx.sl_sz);
}
static int qcom_xfer_msg(struct slim_controller *sctrl,
struct slim_msg_txn *txn)
{
struct qcom_slim_ctrl *ctrl = dev_get_drvdata(sctrl->dev);
DECLARE_COMPLETION_ONSTACK(done);
void *pbuf = slim_alloc_txbuf(ctrl, txn, &done);
unsigned long ms = txn->rl + HZ;
u8 *puc;
int ret = 0, timeout, retries = QCOM_BUF_ALLOC_RETRIES;
u8 la = txn->la;
u32 *head;
/* HW expects length field to be excluded */
txn->rl--;
/* spin till buffer is made available */
if (!pbuf) {
while (retries--) {
usleep_range(10000, 15000);
pbuf = slim_alloc_txbuf(ctrl, txn, &done);
if (pbuf)
break;
}
}
if (retries < 0 && !pbuf)
return -ENOMEM;
puc = (u8 *)pbuf;
head = (u32 *)pbuf;
if (txn->dt == SLIM_MSG_DEST_LOGICALADDR) {
*head = SLIM_MSG_ASM_FIRST_WORD(txn->rl, txn->mt,
txn->mc, 0, la);
puc += 3;
} else {
*head = SLIM_MSG_ASM_FIRST_WORD(txn->rl, txn->mt,
txn->mc, 1, la);
puc += 2;
}
if (slim_tid_txn(txn->mt, txn->mc))
*(puc++) = txn->tid;
if (slim_ec_txn(txn->mt, txn->mc)) {
*(puc++) = (txn->ec & 0xFF);
*(puc++) = (txn->ec >> 8) & 0xFF;
}
if (txn->msg && txn->msg->wbuf)
memcpy(puc, txn->msg->wbuf, txn->msg->num_bytes);
qcom_slim_queue_tx(ctrl, head, txn->rl, MGR_TX_MSG);
timeout = wait_for_completion_timeout(&done, msecs_to_jiffies(ms));
if (!timeout) {
dev_err(ctrl->dev, "TX timed out:MC:0x%x,mt:0x%x", txn->mc,
txn->mt);
ret = -ETIMEDOUT;
}
return ret;
}
static int qcom_set_laddr(struct slim_controller *sctrl,
struct slim_eaddr *ead, u8 laddr)
{
struct qcom_slim_ctrl *ctrl = dev_get_drvdata(sctrl->dev);
struct {
__be16 manf_id;
__be16 prod_code;
u8 dev_index;
u8 instance;
u8 laddr;
} __packed p;
struct slim_val_inf msg = {0};
DEFINE_SLIM_EDEST_TXN(txn, SLIM_MSG_MC_ASSIGN_LOGICAL_ADDRESS,
10, laddr, &msg);
int ret;
p.manf_id = cpu_to_be16(ead->manf_id);
p.prod_code = cpu_to_be16(ead->prod_code);
p.dev_index = ead->dev_index;
p.instance = ead->instance;
p.laddr = laddr;
msg.wbuf = (void *)&p;
msg.num_bytes = 7;
ret = slim_do_transfer(&ctrl->ctrl, &txn);
if (ret)
dev_err(ctrl->dev, "set LA:0x%x failed:ret:%d\n",
laddr, ret);
return ret;
}
static int slim_get_current_rxbuf(struct qcom_slim_ctrl *ctrl, void *buf)
{
unsigned long flags;
spin_lock_irqsave(&ctrl->rx.lock, flags);
if (ctrl->rx.tail == ctrl->rx.head) {
spin_unlock_irqrestore(&ctrl->rx.lock, flags);
return -ENODATA;
}
memcpy(buf, ctrl->rx.base + (ctrl->rx.head * ctrl->rx.sl_sz),
ctrl->rx.sl_sz);
ctrl->rx.head = (ctrl->rx.head + 1) % ctrl->rx.n;
spin_unlock_irqrestore(&ctrl->rx.lock, flags);
return 0;
}
static void qcom_slim_rxwq(struct work_struct *work)
{
u8 buf[SLIM_MSGQ_BUF_LEN];
u8 mc, mt;
int ret;
struct qcom_slim_ctrl *ctrl = container_of(work, struct qcom_slim_ctrl,
wd);
while ((slim_get_current_rxbuf(ctrl, buf)) != -ENODATA) {
mt = SLIM_HEADER_GET_MT(buf[0]);
mc = SLIM_HEADER_GET_MC(buf[1]);
if (mt == SLIM_MSG_MT_CORE &&
mc == SLIM_MSG_MC_REPORT_PRESENT) {
struct slim_eaddr ea;
u8 laddr;
ea.manf_id = be16_to_cpup((__be16 *)&buf[2]);
ea.prod_code = be16_to_cpup((__be16 *)&buf[4]);
ea.dev_index = buf[6];
ea.instance = buf[7];
ret = slim_device_report_present(&ctrl->ctrl, &ea,
&laddr);
if (ret < 0)
dev_err(ctrl->dev, "assign laddr failed:%d\n",
ret);
} else {
dev_err(ctrl->dev, "unexpected message:mc:%x, mt:%x\n",
mc, mt);
}
}
}
static void qcom_slim_prg_slew(struct platform_device *pdev,
struct qcom_slim_ctrl *ctrl)
{
struct resource *slew_mem;
if (!ctrl->slew_reg) {
/* SLEW RATE register for this SLIMbus */
slew_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"slew");
ctrl->slew_reg = devm_ioremap(&pdev->dev, slew_mem->start,
resource_size(slew_mem));
if (!ctrl->slew_reg)
return;
}
writel_relaxed(1, ctrl->slew_reg);
/* Make sure SLIMbus-slew rate enabling goes through */
wmb();
}
static int qcom_slim_probe(struct platform_device *pdev)
{
struct qcom_slim_ctrl *ctrl;
struct slim_controller *sctrl;
struct resource *slim_mem;
int ret, ver;
ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
if (!ctrl)
return -ENOMEM;
ctrl->hclk = devm_clk_get(&pdev->dev, "iface");
if (IS_ERR(ctrl->hclk))
return PTR_ERR(ctrl->hclk);
ctrl->rclk = devm_clk_get(&pdev->dev, "core");
if (IS_ERR(ctrl->rclk))
return PTR_ERR(ctrl->rclk);
ret = clk_set_rate(ctrl->rclk, SLIM_ROOT_FREQ);
if (ret) {
dev_err(&pdev->dev, "ref-clock set-rate failed:%d\n", ret);
return ret;
}
ctrl->irq = platform_get_irq(pdev, 0);
if (!ctrl->irq) {
dev_err(&pdev->dev, "no slimbus IRQ\n");
return -ENODEV;
}
sctrl = &ctrl->ctrl;
sctrl->dev = &pdev->dev;
ctrl->dev = &pdev->dev;
platform_set_drvdata(pdev, ctrl);
dev_set_drvdata(ctrl->dev, ctrl);
slim_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl");
ctrl->base = devm_ioremap_resource(ctrl->dev, slim_mem);
if (IS_ERR(ctrl->base)) {
dev_err(&pdev->dev, "IOremap failed\n");
return PTR_ERR(ctrl->base);
}
sctrl->set_laddr = qcom_set_laddr;
sctrl->xfer_msg = qcom_xfer_msg;
sctrl->wakeup = qcom_clk_pause_wakeup;
ctrl->tx.n = QCOM_TX_MSGS;
ctrl->tx.sl_sz = SLIM_MSGQ_BUF_LEN;
ctrl->rx.n = QCOM_RX_MSGS;
ctrl->rx.sl_sz = SLIM_MSGQ_BUF_LEN;
ctrl->wr_comp = kcalloc(QCOM_TX_MSGS, sizeof(struct completion *),
GFP_KERNEL);
if (!ctrl->wr_comp)
return -ENOMEM;
spin_lock_init(&ctrl->rx.lock);
spin_lock_init(&ctrl->tx.lock);
INIT_WORK(&ctrl->wd, qcom_slim_rxwq);
ctrl->rxwq = create_singlethread_workqueue("qcom_slim_rx");
if (!ctrl->rxwq) {
dev_err(ctrl->dev, "Failed to start Rx WQ\n");
return -ENOMEM;
}
ctrl->framer.rootfreq = SLIM_ROOT_FREQ / 8;
ctrl->framer.superfreq =
ctrl->framer.rootfreq / SLIM_CL_PER_SUPERFRAME_DIV8;
sctrl->a_framer = &ctrl->framer;
sctrl->clkgear = SLIM_MAX_CLK_GEAR;
qcom_slim_prg_slew(pdev, ctrl);
ret = devm_request_irq(&pdev->dev, ctrl->irq, qcom_slim_interrupt,
IRQF_TRIGGER_HIGH, "qcom_slim_irq", ctrl);
if (ret) {
dev_err(&pdev->dev, "request IRQ failed\n");
goto err_request_irq_failed;
}
ret = clk_prepare_enable(ctrl->hclk);
if (ret)
goto err_hclk_enable_failed;
ret = clk_prepare_enable(ctrl->rclk);
if (ret)
goto err_rclk_enable_failed;
ctrl->tx.base = devm_kcalloc(&pdev->dev, ctrl->tx.n, ctrl->tx.sl_sz,
GFP_KERNEL);
if (!ctrl->tx.base) {
ret = -ENOMEM;
goto err;
}
ctrl->rx.base = devm_kcalloc(&pdev->dev,ctrl->rx.n, ctrl->rx.sl_sz,
GFP_KERNEL);
if (!ctrl->rx.base) {
ret = -ENOMEM;
goto err;
}
/* Register with framework before enabling frame, clock */
ret = slim_register_controller(&ctrl->ctrl);
if (ret) {
dev_err(ctrl->dev, "error adding controller\n");
goto err;
}
ver = readl_relaxed(ctrl->base);
/* Version info in 16 MSbits */
ver >>= 16;
/* Component register initialization */
writel(1, ctrl->base + CFG_PORT(COMP_CFG, ver));
writel((EE_MGR_RSC_GRP | EE_NGD_2 | EE_NGD_1),
ctrl->base + CFG_PORT(COMP_TRUST_CFG, ver));
writel((MGR_INT_TX_NACKED_2 |
MGR_INT_MSG_BUF_CONTE | MGR_INT_RX_MSG_RCVD |
MGR_INT_TX_MSG_SENT), ctrl->base + MGR_INT_EN);
writel(1, ctrl->base + MGR_CFG);
/* Framer register initialization */
writel((1 << INTR_WAKE) | (0xA << REF_CLK_GEAR) |
(0xA << CLK_GEAR) | (1 << ROOT_FREQ) | (1 << FRM_ACTIVE) | 1,
ctrl->base + FRM_CFG);
writel(MGR_CFG_ENABLE, ctrl->base + MGR_CFG);
writel(1, ctrl->base + INTF_CFG);
writel(1, ctrl->base + CFG_PORT(COMP_CFG, ver));
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, QCOM_SLIM_AUTOSUSPEND);
pm_runtime_set_active(&pdev->dev);
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_enable(&pdev->dev);
dev_dbg(ctrl->dev, "QCOM SB controller is up:ver:0x%x!\n", ver);
return 0;
err:
clk_disable_unprepare(ctrl->rclk);
err_rclk_enable_failed:
clk_disable_unprepare(ctrl->hclk);
err_hclk_enable_failed:
err_request_irq_failed:
destroy_workqueue(ctrl->rxwq);
return ret;
}
static int qcom_slim_remove(struct platform_device *pdev)
{
struct qcom_slim_ctrl *ctrl = platform_get_drvdata(pdev);
pm_runtime_disable(&pdev->dev);
slim_unregister_controller(&ctrl->ctrl);
destroy_workqueue(ctrl->rxwq);
return 0;
}
/*
* If PM_RUNTIME is not defined, these 2 functions become helper
* functions to be called from system suspend/resume.
*/
#ifdef CONFIG_PM
static int qcom_slim_runtime_suspend(struct device *device)
{
struct platform_device *pdev = to_platform_device(device);
struct qcom_slim_ctrl *ctrl = platform_get_drvdata(pdev);
int ret;
dev_dbg(device, "pm_runtime: suspending...\n");
ret = slim_ctrl_clk_pause(&ctrl->ctrl, false, SLIM_CLK_UNSPECIFIED);
if (ret) {
dev_err(device, "clk pause not entered:%d", ret);
} else {
disable_irq(ctrl->irq);
clk_disable_unprepare(ctrl->hclk);
clk_disable_unprepare(ctrl->rclk);
}
return ret;
}
static int qcom_slim_runtime_resume(struct device *device)
{
struct platform_device *pdev = to_platform_device(device);
struct qcom_slim_ctrl *ctrl = platform_get_drvdata(pdev);
int ret = 0;
dev_dbg(device, "pm_runtime: resuming...\n");
ret = slim_ctrl_clk_pause(&ctrl->ctrl, true, 0);
if (ret)
dev_err(device, "clk pause not exited:%d", ret);
return ret;
}
#endif
#ifdef CONFIG_PM_SLEEP
static int qcom_slim_suspend(struct device *dev)
{
int ret = 0;
if (!pm_runtime_enabled(dev) ||
(!pm_runtime_suspended(dev))) {
dev_dbg(dev, "system suspend");
ret = qcom_slim_runtime_suspend(dev);
}
return ret;
}
static int qcom_slim_resume(struct device *dev)
{
if (!pm_runtime_enabled(dev) || !pm_runtime_suspended(dev)) {
int ret;
dev_dbg(dev, "system resume");
ret = qcom_slim_runtime_resume(dev);
if (!ret) {
pm_runtime_mark_last_busy(dev);
pm_request_autosuspend(dev);
}
return ret;
}
return 0;
}
#endif /* CONFIG_PM_SLEEP */
static const struct dev_pm_ops qcom_slim_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(qcom_slim_suspend, qcom_slim_resume)
SET_RUNTIME_PM_OPS(
qcom_slim_runtime_suspend,
qcom_slim_runtime_resume,
NULL
)
};
static const struct of_device_id qcom_slim_dt_match[] = {
{ .compatible = "qcom,slim", },
{ .compatible = "qcom,apq8064-slim", },
{}
};
static struct platform_driver qcom_slim_driver = {
.probe = qcom_slim_probe,
.remove = qcom_slim_remove,
.driver = {
.name = "qcom_slim_ctrl",
.of_match_table = qcom_slim_dt_match,
.pm = &qcom_slim_dev_pm_ops,
},
};
module_platform_driver(qcom_slim_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Qualcomm SLIMbus Controller");
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