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/*
* RackMac vu-meter driver
*
* (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
* <benh@kernel.crashing.org>
*
* Released under the term of the GNU GPL v2.
*
* Support the CPU-meter LEDs of the Xserve G5
*
* TODO: Implement PWM to do variable intensity and provide userland
* interface for fun. Also, the CPU-meter could be made nicer by being
* a bit less "immediate" but giving instead a more average load over
* time. Patches welcome :-)
*
*/
#undef DEBUG
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/kernel_stat.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/dbdma.h>
#include <asm/macio.h>
#include <asm/keylargo.h>
/* Number of samples in a sample buffer */
#define SAMPLE_COUNT 256
/* CPU meter sampling rate in ms */
#define CPU_SAMPLING_RATE 250
struct rackmeter_dma {
struct dbdma_cmd cmd[4] ____cacheline_aligned;
u32 mark ____cacheline_aligned;
u32 buf1[SAMPLE_COUNT] ____cacheline_aligned;
u32 buf2[SAMPLE_COUNT] ____cacheline_aligned;
} ____cacheline_aligned;
struct rackmeter_cpu {
struct delayed_work sniffer;
struct rackmeter *rm;
cputime64_t prev_wall;
cputime64_t prev_idle;
int zero;
} ____cacheline_aligned;
struct rackmeter {
struct macio_dev *mdev;
unsigned int irq;
struct device_node *i2s;
u8 *ubuf;
struct dbdma_regs __iomem *dma_regs;
void __iomem *i2s_regs;
dma_addr_t dma_buf_p;
struct rackmeter_dma *dma_buf_v;
int stale_irq;
struct rackmeter_cpu cpu[2];
int paused;
struct mutex sem;
};
/* To be set as a tunable */
static int rackmeter_ignore_nice;
/* This GPIO is whacked by the OS X driver when initializing */
#define RACKMETER_MAGIC_GPIO 0x78
/* This is copied from cpufreq_ondemand, maybe we should put it in
* a common header somewhere
*/
static inline cputime64_t get_cpu_idle_time(unsigned int cpu)
{
u64 retval;
retval = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE] +
kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
if (rackmeter_ignore_nice)
retval += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
return retval;
}
static void rackmeter_setup_i2s(struct rackmeter *rm)
{
struct macio_chip *macio = rm->mdev->bus->chip;
/* First whack magic GPIO */
pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, RACKMETER_MAGIC_GPIO, 5);
/* Call feature code to enable the sound channel and the proper
* clock sources
*/
pmac_call_feature(PMAC_FTR_SOUND_CHIP_ENABLE, rm->i2s, 0, 1);
/* Power i2s and stop i2s clock. We whack MacIO FCRs directly for now.
* This is a bit racy, thus we should add new platform functions to
* handle that. snd-aoa needs that too
*/
MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_ENABLE);
MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT);
(void)MACIO_IN32(KEYLARGO_FCR1);
udelay(10);
/* Then setup i2s. For now, we use the same magic value that
* the OS X driver seems to use. We might want to play around
* with the clock divisors later
*/
out_le32(rm->i2s_regs + 0x10, 0x01fa0000);
(void)in_le32(rm->i2s_regs + 0x10);
udelay(10);
/* Fully restart i2s*/
MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE |
KL1_I2S0_CLK_ENABLE_BIT);
(void)MACIO_IN32(KEYLARGO_FCR1);
udelay(10);
}
static void rackmeter_set_default_pattern(struct rackmeter *rm)
{
int i;
for (i = 0; i < 16; i++) {
if (i < 8)
rm->ubuf[i] = (i & 1) * 255;
else
rm->ubuf[i] = ((~i) & 1) * 255;
}
}
static void rackmeter_do_pause(struct rackmeter *rm, int pause)
{
struct rackmeter_dma *rdma = rm->dma_buf_v;
pr_debug("rackmeter: %s\n", pause ? "paused" : "started");
rm->paused = pause;
if (pause) {
DBDMA_DO_STOP(rm->dma_regs);
return;
}
memset(rdma->buf1, 0, SAMPLE_COUNT & sizeof(u32));
memset(rdma->buf2, 0, SAMPLE_COUNT & sizeof(u32));
rm->dma_buf_v->mark = 0;
mb();
out_le32(&rm->dma_regs->cmdptr_hi, 0);
out_le32(&rm->dma_regs->cmdptr, rm->dma_buf_p);
out_le32(&rm->dma_regs->control, (RUN << 16) | RUN);
}
static void rackmeter_setup_dbdma(struct rackmeter *rm)
{
struct rackmeter_dma *db = rm->dma_buf_v;
struct dbdma_cmd *cmd = db->cmd;
/* Make sure dbdma is reset */
DBDMA_DO_RESET(rm->dma_regs);
pr_debug("rackmeter: mark offset=0x%zx\n",
offsetof(struct rackmeter_dma, mark));
pr_debug("rackmeter: buf1 offset=0x%zx\n",
offsetof(struct rackmeter_dma, buf1));
pr_debug("rackmeter: buf2 offset=0x%zx\n",
offsetof(struct rackmeter_dma, buf2));
/* Prepare 4 dbdma commands for the 2 buffers */
memset(cmd, 0, 4 * sizeof(struct dbdma_cmd));
st_le16(&cmd->req_count, 4);
st_le16(&cmd->command, STORE_WORD | INTR_ALWAYS | KEY_SYSTEM);
st_le32(&cmd->phy_addr, rm->dma_buf_p +
offsetof(struct rackmeter_dma, mark));
st_le32(&cmd->cmd_dep, 0x02000000);
cmd++;
st_le16(&cmd->req_count, SAMPLE_COUNT * 4);
st_le16(&cmd->command, OUTPUT_MORE);
st_le32(&cmd->phy_addr, rm->dma_buf_p +
offsetof(struct rackmeter_dma, buf1));
cmd++;
st_le16(&cmd->req_count, 4);
st_le16(&cmd->command, STORE_WORD | INTR_ALWAYS | KEY_SYSTEM);
st_le32(&cmd->phy_addr, rm->dma_buf_p +
offsetof(struct rackmeter_dma, mark));
st_le32(&cmd->cmd_dep, 0x01000000);
cmd++;
st_le16(&cmd->req_count, SAMPLE_COUNT * 4);
st_le16(&cmd->command, OUTPUT_MORE | BR_ALWAYS);
st_le32(&cmd->phy_addr, rm->dma_buf_p +
offsetof(struct rackmeter_dma, buf2));
st_le32(&cmd->cmd_dep, rm->dma_buf_p);
rackmeter_do_pause(rm, 0);
}
static void rackmeter_do_timer(struct work_struct *work)
{
struct rackmeter_cpu *rcpu =
container_of(work, struct rackmeter_cpu, sniffer.work);
struct rackmeter *rm = rcpu->rm;
unsigned int cpu = smp_processor_id();
cputime64_t cur_jiffies, total_idle_ticks;
unsigned int total_ticks, idle_ticks;
int i, offset, load, cumm, pause;
cur_jiffies = jiffies64_to_cputime64(get_jiffies_64());
t
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