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linux/drivers/cpufreq/brcmstb-avs-cpufreq.c
Kees Cook a86854d0c5 treewide: devm_kzalloc() -> devm_kcalloc() 
The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc().
This patch replaces cases of:

        devm_kzalloc(handle, a * b, gfp)

with:
        devm_kcalloc(handle, a * b, gfp)

as well as handling cases of:

        devm_kzalloc(handle, a * b * c, gfp)

with:

        devm_kzalloc(handle, array3_size(a, b, c), gfp)

as it's slightly less ugly than:

        devm_kcalloc(handle, array_size(a, b), c, gfp)

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

        devm_kzalloc(handle, 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.

Some manual whitespace fixes were needed in this patch, as Coccinelle
really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...".

The Coccinelle script used for this was:

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

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

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

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

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

(
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

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

- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	SIZE * COUNT
+	COUNT, SIZE
  , ...)

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

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

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

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

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

(
  devm_kzalloc(HANDLE,
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	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 HANDLE;
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	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 HANDLE;
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@

(
  devm_kzalloc(HANDLE, sizeof(THING) * C2, ...)
|
  devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...)
|
  devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
  devm_kzalloc(HANDLE, C1 * C2, ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (E2)
+	E2, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * E2
+	E2, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (E2)
+	E2, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * E2
+	E2, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	(E1) * E2
+	E1, E2
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	(E1) * (E2)
+	E1, E2
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	E1 * E2
+	E1, E2
  , ...)
)

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

742 lines
19 KiB
C
Raw Blame History

/*
* CPU frequency scaling for Broadcom SoCs with AVS firmware that
* supports DVS or DVFS
*
* Copyright (c) 2016 Broadcom
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
/*
* "AVS" is the name of a firmware developed at Broadcom. It derives
* its name from the technique called "Adaptive Voltage Scaling".
* Adaptive voltage scaling was the original purpose of this firmware.
* The AVS firmware still supports "AVS mode", where all it does is
* adaptive voltage scaling. However, on some newer Broadcom SoCs, the
* AVS Firmware, despite its unchanged name, also supports DFS mode and
* DVFS mode.
*
* In the context of this document and the related driver, "AVS" by
* itself always means the Broadcom firmware and never refers to the
* technique called "Adaptive Voltage Scaling".
*
* The Broadcom STB AVS CPUfreq driver provides voltage and frequency
* scaling on Broadcom SoCs using AVS firmware with support for DFS and
* DVFS. The AVS firmware is running on its own co-processor. The
* driver supports both uniprocessor (UP) and symmetric multiprocessor
* (SMP) systems which share clock and voltage across all CPUs.
*
* Actual voltage and frequency scaling is done solely by the AVS
* firmware. This driver does not change frequency or voltage itself.
* It provides a standard CPUfreq interface to the rest of the kernel
* and to userland. It interfaces with the AVS firmware to effect the
* requested changes and to report back the current system status in a
* way that is expected by existing tools.
*/
#include <linux/cpufreq.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/semaphore.h>
/* Max number of arguments AVS calls take */
#define AVS_MAX_CMD_ARGS 4
/*
* This macro is used to generate AVS parameter register offsets. For
* x >= AVS_MAX_CMD_ARGS, it returns 0 to protect against accidental memory
* access outside of the parameter range. (Offset 0 is the first parameter.)
*/
#define AVS_PARAM_MULT(x) ((x) < AVS_MAX_CMD_ARGS ? (x) : 0)
/* AVS Mailbox Register offsets */
#define AVS_MBOX_COMMAND 0x00
#define AVS_MBOX_STATUS 0x04
#define AVS_MBOX_VOLTAGE0 0x08
#define AVS_MBOX_TEMP0 0x0c
#define AVS_MBOX_PV0 0x10
#define AVS_MBOX_MV0 0x14
#define AVS_MBOX_PARAM(x) (0x18 + AVS_PARAM_MULT(x) * sizeof(u32))
#define AVS_MBOX_REVISION 0x28
#define AVS_MBOX_PSTATE 0x2c
#define AVS_MBOX_HEARTBEAT 0x30
#define AVS_MBOX_MAGIC 0x34
#define AVS_MBOX_SIGMA_HVT 0x38
#define AVS_MBOX_SIGMA_SVT 0x3c
#define AVS_MBOX_VOLTAGE1 0x40
#define AVS_MBOX_TEMP1 0x44
#define AVS_MBOX_PV1 0x48
#define AVS_MBOX_MV1 0x4c
#define AVS_MBOX_FREQUENCY 0x50
/* AVS Commands */
#define AVS_CMD_AVAILABLE 0x00
#define AVS_CMD_DISABLE 0x10
#define AVS_CMD_ENABLE 0x11
#define AVS_CMD_S2_ENTER 0x12
#define AVS_CMD_S2_EXIT 0x13
#define AVS_CMD_BBM_ENTER 0x14
#define AVS_CMD_BBM_EXIT 0x15
#define AVS_CMD_S3_ENTER 0x16
#define AVS_CMD_S3_EXIT 0x17
#define AVS_CMD_BALANCE 0x18
/* PMAP and P-STATE commands */
#define AVS_CMD_GET_PMAP 0x30
#define AVS_CMD_SET_PMAP 0x31
#define AVS_CMD_GET_PSTATE 0x40
#define AVS_CMD_SET_PSTATE 0x41
/* Different modes AVS supports (for GET_PMAP/SET_PMAP) */
#define AVS_MODE_AVS 0x0
#define AVS_MODE_DFS 0x1
#define AVS_MODE_DVS 0x2
#define AVS_MODE_DVFS 0x3
/*
* PMAP parameter p1
* unused:31-24, mdiv_p0:23-16, unused:15-14, pdiv:13-10 , ndiv_int:9-0
*/
#define NDIV_INT_SHIFT 0
#define NDIV_INT_MASK 0x3ff
#define PDIV_SHIFT 10
#define PDIV_MASK 0xf
#define MDIV_P0_SHIFT 16
#define MDIV_P0_MASK 0xff
/*
* PMAP parameter p2
* mdiv_p4:31-24, mdiv_p3:23-16, mdiv_p2:15:8, mdiv_p1:7:0
*/
#define MDIV_P1_SHIFT 0
#define MDIV_P1_MASK 0xff
#define MDIV_P2_SHIFT 8
#define MDIV_P2_MASK 0xff
#define MDIV_P3_SHIFT 16
#define MDIV_P3_MASK 0xff
#define MDIV_P4_SHIFT 24
#define MDIV_P4_MASK 0xff
/* Different P-STATES AVS supports (for GET_PSTATE/SET_PSTATE) */
#define AVS_PSTATE_P0 0x0
#define AVS_PSTATE_P1 0x1
#define AVS_PSTATE_P2 0x2
#define AVS_PSTATE_P3 0x3
#define AVS_PSTATE_P4 0x4
#define AVS_PSTATE_MAX AVS_PSTATE_P4
/* CPU L2 Interrupt Controller Registers */
#define AVS_CPU_L2_SET0 0x04
#define AVS_CPU_L2_INT_MASK BIT(31)
/* AVS Command Status Values */
#define AVS_STATUS_CLEAR 0x00
/* Command/notification accepted */
#define AVS_STATUS_SUCCESS 0xf0
/* Command/notification rejected */
#define AVS_STATUS_FAILURE 0xff
/* Invalid command/notification (unknown) */
#define AVS_STATUS_INVALID 0xf1
/* Non-AVS modes are not supported */
#define AVS_STATUS_NO_SUPP 0xf2
/* Cannot set P-State until P-Map supplied */
#define AVS_STATUS_NO_MAP 0xf3
/* Cannot change P-Map after initial P-Map set */
#define AVS_STATUS_MAP_SET 0xf4
/* Max AVS status; higher numbers are used for debugging */
#define AVS_STATUS_MAX 0xff
/* Other AVS related constants */
#define AVS_LOOP_LIMIT 10000
#define AVS_TIMEOUT 300 /* in ms; expected completion is < 10ms */
#define AVS_FIRMWARE_MAGIC 0xa11600d1
#define BRCM_AVS_CPUFREQ_PREFIX "brcmstb-avs"
#define BRCM_AVS_CPUFREQ_NAME BRCM_AVS_CPUFREQ_PREFIX "-cpufreq"
#define BRCM_AVS_CPU_DATA "brcm,avs-cpu-data-mem"
#define BRCM_AVS_CPU_INTR "brcm,avs-cpu-l2-intr"
#define BRCM_AVS_HOST_INTR "sw_intr"
struct pmap {
unsigned int mode;
unsigned int p1;
unsigned int p2;
unsigned int state;
};
struct private_data {
void __iomem *base;
void __iomem *avs_intr_base;
struct device *dev;
struct completion done;
struct semaphore sem;
struct pmap pmap;
};
static void __iomem *__map_region(const char *name)
{
struct device_node *np;
void __iomem *ptr;
np = of_find_compatible_node(NULL, NULL, name);
if (!np)
return NULL;
ptr = of_iomap(np, 0);
of_node_put(np);
return ptr;
}
static int __issue_avs_command(struct private_data *priv, int cmd, bool is_send,
u32 args[])
{
unsigned long time_left = msecs_to_jiffies(AVS_TIMEOUT);
void __iomem *base = priv->base;
unsigned int i;
int ret;
u32 val;
ret = down_interruptible(&priv->sem);
if (ret)
return ret;
/*
* Make sure no other command is currently running: cmd is 0 if AVS
* co-processor is idle. Due to the guard above, we should almost never
* have to wait here.
*/
for (i = 0, val = 1; val != 0 && i < AVS_LOOP_LIMIT; i++)
val = readl(base + AVS_MBOX_COMMAND);
/* Give the caller a chance to retry if AVS is busy. */
if (i == AVS_LOOP_LIMIT) {
ret = -EAGAIN;
goto out;
}
/* Clear status before we begin. */
writel(AVS_STATUS_CLEAR, base + AVS_MBOX_STATUS);
/* We need to send arguments for this command. */
if (args && is_send) {
for (i = 0; i < AVS_MAX_CMD_ARGS; i++)
writel(args[i], base + AVS_MBOX_PARAM(i));
}
/* Protect from spurious interrupts. */
reinit_completion(&priv->done);
/* Now issue the command & tell firmware to wake up to process it. */
writel(cmd, base + AVS_MBOX_COMMAND);
writel(AVS_CPU_L2_INT_MASK, priv->avs_intr_base + AVS_CPU_L2_SET0);
/* Wait for AVS co-processor to finish processing the command. */
time_left = wait_for_completion_timeout(&priv->done, time_left);
/*
* If the AVS status is not in the expected range, it means AVS didn't
* complete our command in time, and we return an error. Also, if there
* is no "time left", we timed out waiting for the interrupt.
*/
val = readl(base + AVS_MBOX_STATUS);
if (time_left == 0 || val == 0 || val > AVS_STATUS_MAX) {
dev_err(priv->dev, "AVS command %#x didn't complete in time\n",
cmd);
dev_err(priv->dev, " Time left: %u ms, AVS status: %#x\n",
jiffies_to_msecs(time_left), val);
ret = -ETIMEDOUT;
goto out;
}
/* This command returned arguments, so we read them back. */
if (args && !is_send) {
for (i = 0; i < AVS_MAX_CMD_ARGS; i++)
args[i] = readl(base + AVS_MBOX_PARAM(i));
}
/* Clear status to tell AVS co-processor we are done. */
writel(AVS_STATUS_CLEAR, base + AVS_MBOX_STATUS);
/* Convert firmware errors to errno's as much as possible. */
switch (val) {
case AVS_STATUS_INVALID:
ret = -EINVAL;
break;
case AVS_STATUS_NO_SUPP:
ret = -ENOTSUPP;
break;
case AVS_STATUS_NO_MAP:
ret = -ENOENT;
break;
case AVS_STATUS_MAP_SET:
ret = -EEXIST;
break;
case AVS_STATUS_FAILURE:
ret = -EIO;
break;
}
out:
up(&priv->sem);
return ret;
}
static irqreturn_t irq_handler(int irq, void *data)
{
struct private_data *priv = data;
/* AVS command completed execution. Wake up __issue_avs_command(). */
complete(&priv->done);
return IRQ_HANDLED;
}
static char *brcm_avs_mode_to_string(unsigned int mode)
{
switch (mode) {
case AVS_MODE_AVS:
return "AVS";
case AVS_MODE_DFS:
return "DFS";
case AVS_MODE_DVS:
return "DVS";
case AVS_MODE_DVFS:
return "DVFS";
}
return NULL;
}
static void brcm_avs_parse_p1(u32 p1, unsigned int *mdiv_p0, unsigned int *pdiv,
unsigned int *ndiv)
{
*mdiv_p0 = (p1 >> MDIV_P0_SHIFT) & MDIV_P0_MASK;
*pdiv = (p1 >> PDIV_SHIFT) & PDIV_MASK;
*ndiv = (p1 >> NDIV_INT_SHIFT) & NDIV_INT_MASK;
}
static void brcm_avs_parse_p2(u32 p2, unsigned int *mdiv_p1,
unsigned int *mdiv_p2, unsigned int *mdiv_p3,
unsigned int *mdiv_p4)
{
*mdiv_p4 = (p2 >> MDIV_P4_SHIFT) & MDIV_P4_MASK;
*mdiv_p3 = (p2 >> MDIV_P3_SHIFT) & MDIV_P3_MASK;
*mdiv_p2 = (p2 >> MDIV_P2_SHIFT) & MDIV_P2_MASK;
*mdiv_p1 = (p2 >> MDIV_P1_SHIFT) & MDIV_P1_MASK;
}
static int brcm_avs_get_pmap(struct private_data *priv, struct pmap *pmap)
{
u32 args[AVS_MAX_CMD_ARGS];
int ret;
ret = __issue_avs_command(priv, AVS_CMD_GET_PMAP, false, args);
if (ret || !pmap)
return ret;
pmap->mode = args[0];
pmap->p1 = args[1];
pmap->p2 = args[2];
pmap->state = args[3];
return 0;
}
static int brcm_avs_set_pmap(struct private_data *priv, struct pmap *pmap)
{
u32 args[AVS_MAX_CMD_ARGS];
args[0] = pmap->mode;
args[1] = pmap->p1;
args[2] = pmap->p2;
args[3] = pmap->state;
return __issue_avs_command(priv, AVS_CMD_SET_PMAP, true, args);
}
static int brcm_avs_get_pstate(struct private_data *priv, unsigned int *pstate)
{
u32 args[AVS_MAX_CMD_ARGS];
int ret;
ret = __issue_avs_command(priv, AVS_CMD_GET_PSTATE, false, args);
if (ret)
return ret;
*pstate = args[0];
return 0;
}
static int brcm_avs_set_pstate(struct private_data *priv, unsigned int pstate)
{
u32 args[AVS_MAX_CMD_ARGS];
args[0] = pstate;
return __issue_avs_command(priv, AVS_CMD_SET_PSTATE, true, args);
}
static unsigned long brcm_avs_get_voltage(void __iomem *base)
{
return readl(base + AVS_MBOX_VOLTAGE1);
}
static unsigned long brcm_avs_get_frequency(void __iomem *base)
{
return readl(base + AVS_MBOX_FREQUENCY) * 1000; /* in kHz */
}
/*
* We determine which frequencies are supported by cycling through all P-states
* and reading back what frequency we are running at for each P-state.
*/
static struct cpufreq_frequency_table *
brcm_avs_get_freq_table(struct device *dev, struct private_data *priv)
{
struct cpufreq_frequency_table *table;
unsigned int pstate;
int i, ret;
/* Remember P-state for later */
ret = brcm_avs_get_pstate(priv, &pstate);
if (ret)
return ERR_PTR(ret);
table = devm_kcalloc(dev, AVS_PSTATE_MAX + 1, sizeof(*table),
GFP_KERNEL);
if (!table)
return ERR_PTR(-ENOMEM);
for (i = AVS_PSTATE_P0; i <= AVS_PSTATE_MAX; i++) {
ret = brcm_avs_set_pstate(priv, i);
if (ret)
return ERR_PTR(ret);
table[i].frequency = brcm_avs_get_frequency(priv->base);
table[i].driver_data = i;
}
table[i].frequency = CPUFREQ_TABLE_END;
/* Restore P-state */
ret = brcm_avs_set_pstate(priv, pstate);
if (ret)
return ERR_PTR(ret);
return table;
}
/*
* To ensure the right firmware is running we need to
* - check the MAGIC matches what we expect
* - brcm_avs_get_pmap() doesn't return -ENOTSUPP or -EINVAL
* We need to set up our interrupt handling before calling brcm_avs_get_pmap()!
*/
static bool brcm_avs_is_firmware_loaded(struct private_data *priv)
{
u32 magic;
int rc;
rc = brcm_avs_get_pmap(priv, NULL);
magic = readl(priv->base + AVS_MBOX_MAGIC);
return (magic == AVS_FIRMWARE_MAGIC) && (rc != -ENOTSUPP) &&
(rc != -EINVAL);
}
static unsigned int brcm_avs_cpufreq_get(unsigned int cpu)
{
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
struct private_data *priv = policy->driver_data;
return brcm_avs_get_frequency(priv->base);
}
static int brcm_avs_target_index(struct cpufreq_policy *policy,
unsigned int index)
{
return brcm_avs_set_pstate(policy->driver_data,
policy->freq_table[index].driver_data);
}
static int brcm_avs_suspend(struct cpufreq_policy *policy)
{
struct private_data *priv = policy->driver_data;
int ret;
ret = brcm_avs_get_pmap(priv, &priv->pmap);
if (ret)
return ret;
/*
* We can't use the P-state returned by brcm_avs_get_pmap(), since
* that's the initial P-state from when the P-map was downloaded to the
* AVS co-processor, not necessarily the P-state we are running at now.
* So, we get the current P-state explicitly.
*/
return brcm_avs_get_pstate(priv, &priv->pmap.state);
}
static int brcm_avs_resume(struct cpufreq_policy *policy)
{
struct private_data *priv = policy->driver_data;
int ret;
ret = brcm_avs_set_pmap(priv, &priv->pmap);
if (ret == -EEXIST) {
struct platform_device *pdev = cpufreq_get_driver_data();
struct device *dev = &pdev->dev;
dev_warn(dev, "PMAP was already set\n");
ret = 0;
}
return ret;
}
/*
* All initialization code that we only want to execute once goes here. Setup
* code that can be re-tried on every core (if it failed before) can go into
* brcm_avs_cpufreq_init().
*/
static int brcm_avs_prepare_init(struct platform_device *pdev)
{
struct private_data *priv;
struct device *dev;
int host_irq, ret;
dev = &pdev->dev;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = dev;
sema_init(&priv->sem, 1);
init_completion(&priv->done);
platform_set_drvdata(pdev, priv);
priv->base = __map_region(BRCM_AVS_CPU_DATA);
if (!priv->base) {
dev_err(dev, "Couldn't find property %s in device tree.\n",
BRCM_AVS_CPU_DATA);
return -ENOENT;
}
priv->avs_intr_base = __map_region(BRCM_AVS_CPU_INTR);
if (!priv->avs_intr_base) {
dev_err(dev, "Couldn't find property %s in device tree.\n",
BRCM_AVS_CPU_INTR);
ret = -ENOENT;
goto unmap_base;
}
host_irq = platform_get_irq_byname(pdev, BRCM_AVS_HOST_INTR);
if (host_irq < 0) {
dev_err(dev, "Couldn't find interrupt %s -- %d\n",
BRCM_AVS_HOST_INTR, host_irq);
ret = host_irq;
goto unmap_intr_base;
}
ret = devm_request_irq(dev, host_irq, irq_handler, IRQF_TRIGGER_RISING,
BRCM_AVS_HOST_INTR, priv);
if (ret) {
dev_err(dev, "IRQ request failed: %s (%d) -- %d\n",
BRCM_AVS_HOST_INTR, host_irq, ret);
goto unmap_intr_base;
}
if (brcm_avs_is_firmware_loaded(priv))
return 0;
dev_err(dev, "AVS firmware is not loaded or doesn't support DVFS\n");
ret = -ENODEV;
unmap_intr_base:
iounmap(priv->avs_intr_base);
unmap_base:
iounmap(priv->base);
return ret;
}
static int brcm_avs_cpufreq_init(struct cpufreq_policy *policy)
{
struct cpufreq_frequency_table *freq_table;
struct platform_device *pdev;
struct private_data *priv;
struct device *dev;
int ret;
pdev = cpufreq_get_driver_data();
priv = platform_get_drvdata(pdev);
policy->driver_data = priv;
dev = &pdev->dev;
freq_table = brcm_avs_get_freq_table(dev, priv);
if (IS_ERR(freq_table)) {
ret = PTR_ERR(freq_table);
dev_err(dev, "Couldn't determine frequency table (%d).\n", ret);
return ret;
}
policy->freq_table = freq_table;
/* All cores share the same clock and thus the same policy. */
cpumask_setall(policy->cpus);
ret = __issue_avs_command(priv, AVS_CMD_ENABLE, false, NULL);
if (!ret) {
unsigned int pstate;
ret = brcm_avs_get_pstate(priv, &pstate);
if (!ret) {
policy->cur = freq_table[pstate].frequency;
dev_info(dev, "registered\n");
return 0;
}
}
dev_err(dev, "couldn't initialize driver (%d)\n", ret);
return ret;
}
static ssize_t show_brcm_avs_pstate(struct cpufreq_policy *policy, char *buf)
{
struct private_data *priv = policy->driver_data;
unsigned int pstate;
if (brcm_avs_get_pstate(priv, &pstate))
return sprintf(buf, "<unknown>\n");
return sprintf(buf, "%u\n", pstate);
}
static ssize_t show_brcm_avs_mode(struct cpufreq_policy *policy, char *buf)
{
struct private_data *priv = policy->driver_data;
struct pmap pmap;
if (brcm_avs_get_pmap(priv, &pmap))
return sprintf(buf, "<unknown>\n");
return sprintf(buf, "%s %u\n", brcm_avs_mode_to_string(pmap.mode),
pmap.mode);
}
static ssize_t show_brcm_avs_pmap(struct cpufreq_policy *policy, char *buf)
{
unsigned int mdiv_p0, mdiv_p1, mdiv_p2, mdiv_p3, mdiv_p4;
struct private_data *priv = policy->driver_data;
unsigned int ndiv, pdiv;
struct pmap pmap;
if (brcm_avs_get_pmap(priv, &pmap))
return sprintf(buf, "<unknown>\n");
brcm_avs_parse_p1(pmap.p1, &mdiv_p0, &pdiv, &ndiv);
brcm_avs_parse_p2(pmap.p2, &mdiv_p1, &mdiv_p2, &mdiv_p3, &mdiv_p4);
return sprintf(buf, "0x%08x 0x%08x %u %u %u %u %u %u %u %u %u\n",
pmap.p1, pmap.p2, ndiv, pdiv, mdiv_p0, mdiv_p1, mdiv_p2,
mdiv_p3, mdiv_p4, pmap.mode, pmap.state);
}
static ssize_t show_brcm_avs_voltage(struct cpufreq_policy *policy, char *buf)
{
struct private_data *priv = policy->driver_data;
return sprintf(buf, "0x%08lx\n", brcm_avs_get_voltage(priv->base));
}
static ssize_t show_brcm_avs_frequency(struct cpufreq_policy *policy, char *buf)
{
struct private_data *priv = policy->driver_data;
return sprintf(buf, "0x%08lx\n", brcm_avs_get_frequency(priv->base));
}
cpufreq_freq_attr_ro(brcm_avs_pstate);
cpufreq_freq_attr_ro(brcm_avs_mode);
cpufreq_freq_attr_ro(brcm_avs_pmap);
cpufreq_freq_attr_ro(brcm_avs_voltage);
cpufreq_freq_attr_ro(brcm_avs_frequency);
static struct freq_attr *brcm_avs_cpufreq_attr[] = {
&cpufreq_freq_attr_scaling_available_freqs,
&brcm_avs_pstate,
&brcm_avs_mode,
&brcm_avs_pmap,
&brcm_avs_voltage,
&brcm_avs_frequency,
NULL
};
static struct cpufreq_driver brcm_avs_driver = {
.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK,
.verify = cpufreq_generic_frequency_table_verify,
.target_index = brcm_avs_target_index,
.get = brcm_avs_cpufreq_get,
.suspend = brcm_avs_suspend,
.resume = brcm_avs_resume,
.init = brcm_avs_cpufreq_init,
.attr = brcm_avs_cpufreq_attr,
.name = BRCM_AVS_CPUFREQ_PREFIX,
};
static int brcm_avs_cpufreq_probe(struct platform_device *pdev)
{
int ret;
ret = brcm_avs_prepare_init(pdev);
if (ret)
return ret;
brcm_avs_driver.driver_data = pdev;
return cpufreq_register_driver(&brcm_avs_driver);
}
static int brcm_avs_cpufreq_remove(struct platform_device *pdev)
{
struct private_data *priv;
int ret;
ret = cpufreq_unregister_driver(&brcm_avs_driver);
if (ret)
return ret;
priv = platform_get_drvdata(pdev);
iounmap(priv->base);
iounmap(priv->avs_intr_base);
return 0;
}
static const struct of_device_id brcm_avs_cpufreq_match[] = {
{ .compatible = BRCM_AVS_CPU_DATA },
{ }
};
MODULE_DEVICE_TABLE(of, brcm_avs_cpufreq_match);
static struct platform_driver brcm_avs_cpufreq_platdrv = {
.driver = {
.name = BRCM_AVS_CPUFREQ_NAME,
.of_match_table = brcm_avs_cpufreq_match,
},
.probe = brcm_avs_cpufreq_probe,
.remove = brcm_avs_cpufreq_remove,
};
module_platform_driver(brcm_avs_cpufreq_platdrv);
MODULE_AUTHOR("Markus Mayer <mmayer@broadcom.com>");
MODULE_DESCRIPTION("CPUfreq driver for Broadcom STB AVS");
MODULE_LICENSE("GPL");
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