[POWERPC] Xserve cpu-meter driver
This is a small driver for the Xserve G5 CPU-meter blue LEDs on the front-panel. It might work on the Xserve G4 as well though that was not tested. It's pretty basic and could use some improvements if somebody cares doing them. :) Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt
Paul Mackerras
parent
088df4d256
commit
3e00a5aec3
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@ -228,4 +228,11 @@ config ANSLCD
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tristate "Support for ANS LCD display"
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depends on ADB_CUDA && PPC_PMAC
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config PMAC_RACKMETER
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tristate "Support for Apple XServe front panel LEDs"
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depends on PPC_PMAC
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help
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This driver procides some support to control the front panel
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blue LEDs "vu-meter" of the XServer macs.
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endmenu
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@ -42,3 +42,4 @@ obj-$(CONFIG_WINDFARM_PM112) += windfarm_pm112.o windfarm_smu_sat.o \
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windfarm_smu_sensors.o \
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windfarm_max6690_sensor.o \
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windfarm_lm75_sensor.o windfarm_pid.o
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obj-$(CONFIG_PMAC_RACKMETER) += rack-meter.o
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@ -0,0 +1,612 @@
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/*
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* RackMac vu-meter driver
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*
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* (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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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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* Support the CPU-meter LEDs of the Xserve G5
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*
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* TODO: Implement PWM to do variable intensity and provide userland
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* interface for fun. Also, the CPU-meter could be made nicer by being
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* a bit less "immediate" but giving instead a more average load over
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* time. Patches welcome :-)
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*
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*/
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#undef DEBUG
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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/interrupt.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/dma-mapping.h>
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#include <linux/kernel_stat.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/dbdma.h>
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#include <asm/dbdma.h>
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#include <asm/macio.h>
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#include <asm/keylargo.h>
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/* Number of samples in a sample buffer */
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#define SAMPLE_COUNT 256
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/* CPU meter sampling rate in ms */
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#define CPU_SAMPLING_RATE 250
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struct rackmeter_dma {
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struct dbdma_cmd cmd[4] ____cacheline_aligned;
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u32 mark ____cacheline_aligned;
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u32 buf1[SAMPLE_COUNT] ____cacheline_aligned;
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u32 buf2[SAMPLE_COUNT] ____cacheline_aligned;
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} ____cacheline_aligned;
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struct rackmeter_cpu {
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struct work_struct sniffer;
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cputime64_t prev_wall;
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cputime64_t prev_idle;
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int zero;
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} ____cacheline_aligned;
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struct rackmeter {
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struct macio_dev *mdev;
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unsigned int irq;
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struct device_node *i2s;
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u8 *ubuf;
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struct dbdma_regs __iomem *dma_regs;
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void __iomem *i2s_regs;
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dma_addr_t dma_buf_p;
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struct rackmeter_dma *dma_buf_v;
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int stale_irq;
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struct rackmeter_cpu cpu[2];
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int paused;
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struct mutex sem;
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};
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/* To be set as a tunable */
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static int rackmeter_ignore_nice;
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/* This GPIO is whacked by the OS X driver when initializing */
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#define RACKMETER_MAGIC_GPIO 0x78
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/* This is copied from cpufreq_ondemand, maybe we should put it in
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* a common header somewhere
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*/
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static inline cputime64_t get_cpu_idle_time(unsigned int cpu)
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{
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cputime64_t retval;
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retval = cputime64_add(kstat_cpu(cpu).cpustat.idle,
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kstat_cpu(cpu).cpustat.iowait);
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if (rackmeter_ignore_nice)
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retval = cputime64_add(retval, kstat_cpu(cpu).cpustat.nice);
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return retval;
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}
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static void rackmeter_setup_i2s(struct rackmeter *rm)
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{
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struct macio_chip *macio = rm->mdev->bus->chip;
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/* First whack magic GPIO */
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pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, RACKMETER_MAGIC_GPIO, 5);
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/* Call feature code to enable the sound channel and the proper
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* clock sources
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*/
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pmac_call_feature(PMAC_FTR_SOUND_CHIP_ENABLE, rm->i2s, 0, 1);
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/* Power i2s and stop i2s clock. We whack MacIO FCRs directly for now.
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* This is a bit racy, thus we should add new platform functions to
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* handle that. snd-aoa needs that too
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*/
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MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_ENABLE);
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MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT);
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(void)MACIO_IN32(KEYLARGO_FCR1);
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udelay(10);
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/* Then setup i2s. For now, we use the same magic value that
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* the OS X driver seems to use. We might want to play around
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* with the clock divisors later
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*/
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out_le32(rm->i2s_regs + 0x10, 0x01fa0000);
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(void)in_le32(rm->i2s_regs + 0x10);
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udelay(10);
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/* Fully restart i2s*/
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MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE |
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KL1_I2S0_CLK_ENABLE_BIT);
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(void)MACIO_IN32(KEYLARGO_FCR1);
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udelay(10);
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}
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static void rackmeter_set_default_pattern(struct rackmeter *rm)
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{
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int i;
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for (i = 0; i < 16; i++) {
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if (i < 8)
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rm->ubuf[i] = (i & 1) * 255;
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else
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rm->ubuf[i] = ((~i) & 1) * 255;
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}
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}
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static void rackmeter_do_pause(struct rackmeter *rm, int pause)
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{
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struct rackmeter_dma *rdma = rm->dma_buf_v;
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pr_debug("rackmeter: %s\n", pause ? "paused" : "started");
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rm->paused = pause;
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if (pause) {
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DBDMA_DO_STOP(rm->dma_regs);
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return;
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}
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memset(rdma->buf1, 0, SAMPLE_COUNT & sizeof(u32));
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memset(rdma->buf2, 0, SAMPLE_COUNT & sizeof(u32));
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rm->dma_buf_v->mark = 0;
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mb();
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out_le32(&rm->dma_regs->cmdptr_hi, 0);
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out_le32(&rm->dma_regs->cmdptr, rm->dma_buf_p);
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out_le32(&rm->dma_regs->control, (RUN << 16) | RUN);
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}
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static void rackmeter_setup_dbdma(struct rackmeter *rm)
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{
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struct rackmeter_dma *db = rm->dma_buf_v;
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struct dbdma_cmd *cmd = db->cmd;
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/* Make sure dbdma is reset */
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DBDMA_DO_RESET(rm->dma_regs);
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pr_debug("rackmeter: mark offset=0x%lx\n",
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offsetof(struct rackmeter_dma, mark));
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pr_debug("rackmeter: buf1 offset=0x%lx\n",
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offsetof(struct rackmeter_dma, buf1));
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pr_debug("rackmeter: buf2 offset=0x%lx\n",
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offsetof(struct rackmeter_dma, buf2));
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/* Prepare 4 dbdma commands for the 2 buffers */
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memset(cmd, 0, 4 * sizeof(struct dbdma_cmd));
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st_le16(&cmd->req_count, 4);
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st_le16(&cmd->command, STORE_WORD | INTR_ALWAYS | KEY_SYSTEM);
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st_le32(&cmd->phy_addr, rm->dma_buf_p +
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offsetof(struct rackmeter_dma, mark));
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st_le32(&cmd->cmd_dep, 0x02000000);
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cmd++;
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st_le16(&cmd->req_count, SAMPLE_COUNT * 4);
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st_le16(&cmd->command, OUTPUT_MORE);
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st_le32(&cmd->phy_addr, rm->dma_buf_p +
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offsetof(struct rackmeter_dma, buf1));
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cmd++;
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st_le16(&cmd->req_count, 4);
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st_le16(&cmd->command, STORE_WORD | INTR_ALWAYS | KEY_SYSTEM);
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st_le32(&cmd->phy_addr, rm->dma_buf_p +
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offsetof(struct rackmeter_dma, mark));
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st_le32(&cmd->cmd_dep, 0x01000000);
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cmd++;
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st_le16(&cmd->req_count, SAMPLE_COUNT * 4);
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st_le16(&cmd->command, OUTPUT_MORE | BR_ALWAYS);
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st_le32(&cmd->phy_addr, rm->dma_buf_p +
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offsetof(struct rackmeter_dma, buf2));
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st_le32(&cmd->cmd_dep, rm->dma_buf_p);
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rackmeter_do_pause(rm, 0);
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}
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static void rackmeter_do_timer(void *data)
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{
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struct rackmeter *rm = data;
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unsigned int cpu = smp_processor_id();
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struct rackmeter_cpu *rcpu = &rm->cpu[cpu];
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cputime64_t cur_jiffies, total_idle_ticks;
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unsigned int total_ticks, idle_ticks;
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int i, offset, load, cumm, pause;
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cur_jiffies = jiffies64_to_cputime64(get_jiffies_64());
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total_ticks = (unsigned int)cputime64_sub(cur_jiffies,
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rcpu->prev_wall);
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rcpu->prev_wall = cur_jiffies;
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total_idle_ticks = get_cpu_idle_time(cpu);
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idle_ticks = (unsigned int) cputime64_sub(total_idle_ticks,
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rcpu->prev_idle);
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rcpu->prev_idle = total_idle_ticks;
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/* We do a very dumb calculation to update the LEDs for now,
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* we'll do better once we have actual PWM implemented
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*/
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load = (9 * (total_ticks - idle_ticks)) / total_ticks;
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offset = cpu << 3;
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cumm = 0;
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for (i = 0; i < 8; i++) {
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u8 ub = (load > i) ? 0xff : 0;
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rm->ubuf[i + offset] = ub;
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cumm |= ub;
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}
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rcpu->zero = (cumm == 0);
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/* Now check if LEDs are all 0, we can stop DMA */
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pause = (rm->cpu[0].zero && rm->cpu[1].zero);
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if (pause != rm->paused) {
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mutex_lock(&rm->sem);
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pause = (rm->cpu[0].zero && rm->cpu[1].zero);
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rackmeter_do_pause(rm, pause);
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mutex_unlock(&rm->sem);
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}
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schedule_delayed_work_on(cpu, &rcpu->sniffer,
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msecs_to_jiffies(CPU_SAMPLING_RATE));
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}
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static void __devinit rackmeter_init_cpu_sniffer(struct rackmeter *rm)
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{
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unsigned int cpu;
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/* This driver works only with 1 or 2 CPUs numbered 0 and 1,
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* but that's really all we have on Apple Xserve. It doesn't
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* play very nice with CPU hotplug neither but we don't do that
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* on those machines yet
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*/
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INIT_WORK(&rm->cpu[0].sniffer, rackmeter_do_timer, rm);
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INIT_WORK(&rm->cpu[1].sniffer, rackmeter_do_timer, rm);
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for_each_online_cpu(cpu) {
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struct rackmeter_cpu *rcpu;
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if (cpu > 1)
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continue;
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rcpu = &rm->cpu[cpu];;
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rcpu->prev_idle = get_cpu_idle_time(cpu);
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rcpu->prev_wall = jiffies64_to_cputime64(get_jiffies_64());
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schedule_delayed_work_on(cpu, &rm->cpu[cpu].sniffer,
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msecs_to_jiffies(CPU_SAMPLING_RATE));
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}
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}
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static void __devexit rackmeter_stop_cpu_sniffer(struct rackmeter *rm)
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{
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cancel_rearming_delayed_work(&rm->cpu[0].sniffer);
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cancel_rearming_delayed_work(&rm->cpu[1].sniffer);
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}
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static int rackmeter_setup(struct rackmeter *rm)
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{
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pr_debug("rackmeter: setting up i2s..\n");
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rackmeter_setup_i2s(rm);
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pr_debug("rackmeter: setting up default pattern..\n");
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rackmeter_set_default_pattern(rm);
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pr_debug("rackmeter: setting up dbdma..\n");
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rackmeter_setup_dbdma(rm);
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pr_debug("rackmeter: start CPU measurements..\n");
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rackmeter_init_cpu_sniffer(rm);
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printk(KERN_INFO "RackMeter initialized\n");
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return 0;
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}
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/* XXX FIXME: No PWM yet, this is 0/1 */
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static u32 rackmeter_calc_sample(struct rackmeter *rm, unsigned int index)
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{
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int led;
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u32 sample = 0;
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for (led = 0; led < 16; led++) {
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sample >>= 1;
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sample |= ((rm->ubuf[led] >= 0x80) << 15);
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}
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return (sample << 17) | (sample >> 15);
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}
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static irqreturn_t rackmeter_irq(int irq, void *arg)
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{
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struct rackmeter *rm = arg;
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struct rackmeter_dma *db = rm->dma_buf_v;
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unsigned int mark, i;
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u32 *buf;
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/* Flush PCI buffers with an MMIO read. Maybe we could actually
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* check the status one day ... in case things go wrong, though
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* this never happened to me
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*/
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(void)in_le32(&rm->dma_regs->status);
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/* Make sure the CPU gets us in order */
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rmb();
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/* Read mark */
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mark = db->mark;
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if (mark != 1 && mark != 2) {
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printk(KERN_WARNING "rackmeter: Incorrect DMA mark 0x%08x\n",
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mark);
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/* We allow for 3 errors like that (stale DBDMA irqs) */
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if (++rm->stale_irq > 3) {
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printk(KERN_ERR "rackmeter: Too many errors,"
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" stopping DMA\n");
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DBDMA_DO_RESET(rm->dma_regs);
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}
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return IRQ_HANDLED;
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}
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/* Next buffer we need to fill is mark value */
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buf = mark == 1 ? db->buf1 : db->buf2;
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/* Fill it now. This routine converts the 8 bits depth sample array
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* into the PWM bitmap for each LED.
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*/
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for (i = 0; i < SAMPLE_COUNT; i++)
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buf[i] = rackmeter_calc_sample(rm, i);
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return IRQ_HANDLED;
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}
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static int __devinit rackmeter_probe(struct macio_dev* mdev,
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const struct of_device_id *match)
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{
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struct device_node *i2s = NULL, *np = NULL;
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struct rackmeter *rm = NULL;
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struct resource ri2s, rdma;
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int rc = -ENODEV;
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pr_debug("rackmeter_probe()\n");
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/* Get i2s-a node */
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while ((i2s = of_get_next_child(mdev->ofdev.node, i2s)) != NULL)
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if (strcmp(i2s->name, "i2s-a") == 0)
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break;
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if (i2s == NULL) {
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pr_debug(" i2s-a child not found\n");
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goto bail;
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}
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/* Get lightshow or virtual sound */
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while ((np = of_get_next_child(i2s, np)) != NULL) {
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if (strcmp(np->name, "lightshow") == 0)
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break;
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if ((strcmp(np->name, "sound") == 0) &&
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get_property(np, "virtual", NULL) != NULL)
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break;
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}
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if (np == NULL) {
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pr_debug(" lightshow or sound+virtual child not found\n");
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goto bail;
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}
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/* Create and initialize our instance data */
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rm = kzalloc(sizeof(struct rackmeter), GFP_KERNEL);
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if (rm == NULL) {
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printk(KERN_ERR "rackmeter: failed to allocate memory !\n");
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rc = -ENOMEM;
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goto bail_release;
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}
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rm->mdev = mdev;
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rm->i2s = i2s;
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mutex_init(&rm->sem);
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dev_set_drvdata(&mdev->ofdev.dev, rm);
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/* Check resources availability. We need at least resource 0 and 1 */
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#if 0 /* Use that when i2s-a is finally an mdev per-se */
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if (macio_resource_count(mdev) < 2 || macio_irq_count(mdev) < 2) {
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printk(KERN_ERR
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"rackmeter: found match but lacks resources: %s"
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" (%d resources, %d interrupts)\n",
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mdev->ofdev.node->full_name);
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rc = -ENXIO;
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goto bail_free;
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}
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if (macio_request_resources(mdev, "rackmeter")) {
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printk(KERN_ERR
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"rackmeter: failed to request resources: %s\n",
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mdev->ofdev.node->full_name);
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rc = -EBUSY;
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goto bail_free;
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}
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rm->irq = macio_irq(mdev, 1);
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#else
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rm->irq = irq_of_parse_and_map(i2s, 1);
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if (rm->irq == NO_IRQ ||
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of_address_to_resource(i2s, 0, &ri2s) ||
|
||||
of_address_to_resource(i2s, 1, &rdma)) {
|
||||
printk(KERN_ERR
|
||||
"rackmeter: found match but lacks resources: %s",
|
||||
mdev->ofdev.node->full_name);
|
||||
rc = -ENXIO;
|
||||
goto bail_free;
|
||||
}
|
||||
#endif
|
||||
|
||||
pr_debug(" i2s @0x%08x\n", (unsigned int)ri2s.start);
|
||||
pr_debug(" dma @0x%08x\n", (unsigned int)rdma.start);
|
||||
pr_debug(" irq %d\n", rm->irq);
|
||||
|
||||
rm->ubuf = (u8 *)__get_free_page(GFP_KERNEL);
|
||||
if (rm->ubuf == NULL) {
|
||||
printk(KERN_ERR
|
||||
"rackmeter: failed to allocate samples page !\n");
|
||||
rc = -ENOMEM;
|
||||
goto bail_release;
|
||||
}
|
||||
|
||||
rm->dma_buf_v = dma_alloc_coherent(&macio_get_pci_dev(mdev)->dev,
|
||||
sizeof(struct rackmeter_dma),
|
||||
&rm->dma_buf_p, GFP_KERNEL);
|
||||
if (rm->dma_buf_v == NULL) {
|
||||
printk(KERN_ERR
|
||||
"rackmeter: failed to allocate dma buffer !\n");
|
||||
rc = -ENOMEM;
|
||||
goto bail_free_samples;
|
||||
}
|
||||
#if 0
|
||||
rm->i2s_regs = ioremap(macio_resource_start(mdev, 0), 0x1000);
|
||||
#else
|
||||
rm->i2s_regs = ioremap(ri2s.start, 0x1000);
|
||||
#endif
|
||||
if (rm->i2s_regs == NULL) {
|
||||
printk(KERN_ERR
|
||||
"rackmeter: failed to map i2s registers !\n");
|
||||
rc = -ENXIO;
|
||||
goto bail_free_dma;
|
||||
}
|
||||
#if 0
|
||||
rm->dma_regs = ioremap(macio_resource_start(mdev, 1), 0x100);
|
||||
#else
|
||||
rm->dma_regs = ioremap(rdma.start, 0x100);
|
||||
#endif
|
||||
if (rm->dma_regs == NULL) {
|
||||
printk(KERN_ERR
|
||||
"rackmeter: failed to map dma registers !\n");
|
||||
rc = -ENXIO;
|
||||
goto bail_unmap_i2s;
|
||||
}
|
||||
|
||||
rc = rackmeter_setup(rm);
|
||||
if (rc) {
|
||||
printk(KERN_ERR
|
||||
"rackmeter: failed to initialize !\n");
|
||||
rc = -ENXIO;
|
||||
goto bail_unmap_dma;
|
||||
}
|
||||
|
||||
rc = request_irq(rm->irq, rackmeter_irq, 0, "rackmeter", rm);
|
||||
if (rc != 0) {
|
||||
printk(KERN_ERR
|
||||
"rackmeter: failed to request interrupt !\n");
|
||||
goto bail_stop_dma;
|
||||
}
|
||||
of_node_put(np);
|
||||
return 0;
|
||||
|
||||
bail_stop_dma:
|
||||
DBDMA_DO_RESET(rm->dma_regs);
|
||||
bail_unmap_dma:
|
||||
iounmap(rm->dma_regs);
|
||||
bail_unmap_i2s:
|
||||
iounmap(rm->i2s_regs);
|
||||
bail_free_dma:
|
||||
dma_free_coherent(&macio_get_pci_dev(mdev)->dev,
|
||||
sizeof(struct rackmeter_dma),
|
||||
rm->dma_buf_v, rm->dma_buf_p);
|
||||
bail_free_samples:
|
||||
free_page((unsigned long)rm->ubuf);
|
||||
bail_release:
|
||||
#if 0
|
||||
macio_release_resources(mdev);
|
||||
#endif
|
||||
bail_free:
|
||||
kfree(rm);
|
||||
bail:
|
||||
of_node_put(i2s);
|
||||
of_node_put(np);
|
||||
dev_set_drvdata(&mdev->ofdev.dev, NULL);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int __devexit rackmeter_remove(struct macio_dev* mdev)
|
||||
{
|
||||
struct rackmeter *rm = dev_get_drvdata(&mdev->ofdev.dev);
|
||||
|
||||
/* Stop CPU sniffer timer & work queues */
|
||||
rackmeter_stop_cpu_sniffer(rm);
|
||||
|
||||
/* Clear reference to private data */
|
||||
dev_set_drvdata(&mdev->ofdev.dev, NULL);
|
||||
|
||||
/* Stop/reset dbdma */
|
||||
DBDMA_DO_RESET(rm->dma_regs);
|
||||
|
||||
/* Release the IRQ */
|
||||
free_irq(rm->irq, rm);
|
||||
|
||||
/* Unmap registers */
|
||||
iounmap(rm->dma_regs);
|
||||
iounmap(rm->i2s_regs);
|
||||
|
||||
/* Free DMA */
|
||||
dma_free_coherent(&macio_get_pci_dev(mdev)->dev,
|
||||
sizeof(struct rackmeter_dma),
|
||||
rm->dma_buf_v, rm->dma_buf_p);
|
||||
|
||||
/* Free samples */
|
||||
free_page((unsigned long)rm->ubuf);
|
||||
|
||||
#if 0
|
||||
/* Release resources */
|
||||
macio_release_resources(mdev);
|
||||
#endif
|
||||
|
||||
/* Get rid of me */
|
||||
kfree(rm);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int rackmeter_shutdown(struct macio_dev* mdev)
|
||||
{
|
||||
struct rackmeter *rm = dev_get_drvdata(&mdev->ofdev.dev);
|
||||
|
||||
if (rm == NULL)
|
||||
return -ENODEV;
|
||||
|
||||
/* Stop CPU sniffer timer & work queues */
|
||||
rackmeter_stop_cpu_sniffer(rm);
|
||||
|
||||
/* Stop/reset dbdma */
|
||||
DBDMA_DO_RESET(rm->dma_regs);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct of_device_id rackmeter_match[] = {
|
||||
{ .name = "i2s" },
|
||||
{ }
|
||||
};
|
||||
|
||||
static struct macio_driver rackmeter_drv = {
|
||||
.name = "rackmeter",
|
||||
.owner = THIS_MODULE,
|
||||
.match_table = rackmeter_match,
|
||||
.probe = rackmeter_probe,
|
||||
.remove = rackmeter_remove,
|
||||
.shutdown = rackmeter_shutdown,
|
||||
};
|
||||
|
||||
|
||||
static int __init rackmeter_init(void)
|
||||
{
|
||||
pr_debug("rackmeter_init()\n");
|
||||
|
||||
return macio_register_driver(&rackmeter_drv);
|
||||
}
|
||||
|
||||
static void __exit rackmeter_exit(void)
|
||||
{
|
||||
pr_debug("rackmeter_exit()\n");
|
||||
|
||||
macio_unregister_driver(&rackmeter_drv);
|
||||
}
|
||||
|
||||
module_init(rackmeter_init);
|
||||
module_exit(rackmeter_exit);
|
||||
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
|
||||
MODULE_DESCRIPTION("RackMeter: Support vu-meter on XServe front panel");
|
||||
|
|
@ -95,7 +95,13 @@ struct dbdma_cmd {
|
|||
#define DBDMA_DO_STOP(regs) do { \
|
||||
out_le32(&((regs)->control), (RUN|FLUSH)<<16); \
|
||||
while(in_le32(&((regs)->status)) & (ACTIVE|FLUSH)) \
|
||||
; \
|
||||
; \
|
||||
} while(0)
|
||||
|
||||
#define DBDMA_DO_RESET(regs) do { \
|
||||
out_le32(&((regs)->control), (ACTIVE|DEAD|WAKE|FLUSH|PAUSE|RUN)<<16);\
|
||||
while(in_le32(&((regs)->status)) & (RUN)) \
|
||||
; \
|
||||
} while(0)
|
||||
|
||||
#endif /* _ASM_DBDMA_H_ */
|
||||
|
|
|
|||
Loading…
Reference in New Issue