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620 lines
15 KiB
620 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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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* <[email protected]> |
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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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#undef DEBUG |
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|
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.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 <linux/of_address.h> |
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#include <linux/of_irq.h> |
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|
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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/macio.h> |
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#include <asm/keylargo.h> |
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|
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/* Number of samples in a sample buffer */ |
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#define SAMPLE_COUNT 256 |
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|
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/* CPU meter sampling rate in ms */ |
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#define CPU_SAMPLING_RATE 250 |
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|
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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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|
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struct rackmeter_cpu { |
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struct delayed_work sniffer; |
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struct rackmeter *rm; |
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u64 prev_wall; |
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u64 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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|
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/* To be set as a tunable */ |
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static int rackmeter_ignore_nice; |
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|
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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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|
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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 u64 get_cpu_idle_time(unsigned int cpu) |
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{ |
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struct kernel_cpustat *kcpustat = &kcpustat_cpu(cpu); |
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u64 retval; |
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retval = kcpustat->cpustat[CPUTIME_IDLE] + |
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kcpustat->cpustat[CPUTIME_IOWAIT]; |
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|
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if (rackmeter_ignore_nice) |
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retval += kcpustat_field(kcpustat, CPUTIME_NICE, cpu); |
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return retval; |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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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, sizeof(rdma->buf1)); |
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memset(rdma->buf2, 0, sizeof(rdma->buf2)); |
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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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|
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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%zx\n", |
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offsetof(struct rackmeter_dma, mark)); |
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pr_debug("rackmeter: buf1 offset=0x%zx\n", |
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offsetof(struct rackmeter_dma, buf1)); |
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pr_debug("rackmeter: buf2 offset=0x%zx\n", |
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offsetof(struct rackmeter_dma, buf2)); |
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|
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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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cmd->req_count = cpu_to_le16(4); |
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cmd->command = cpu_to_le16(STORE_WORD | INTR_ALWAYS | KEY_SYSTEM); |
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cmd->phy_addr = cpu_to_le32(rm->dma_buf_p + |
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offsetof(struct rackmeter_dma, mark)); |
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cmd->cmd_dep = cpu_to_le32(0x02000000); |
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cmd++; |
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cmd->req_count = cpu_to_le16(SAMPLE_COUNT * 4); |
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cmd->command = cpu_to_le16(OUTPUT_MORE); |
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cmd->phy_addr = cpu_to_le32(rm->dma_buf_p + |
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offsetof(struct rackmeter_dma, buf1)); |
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cmd++; |
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cmd->req_count = cpu_to_le16(4); |
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cmd->command = cpu_to_le16(STORE_WORD | INTR_ALWAYS | KEY_SYSTEM); |
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cmd->phy_addr = cpu_to_le32(rm->dma_buf_p + |
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offsetof(struct rackmeter_dma, mark)); |
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cmd->cmd_dep = cpu_to_le32(0x01000000); |
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cmd++; |
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cmd->req_count = cpu_to_le16(SAMPLE_COUNT * 4); |
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cmd->command = cpu_to_le16(OUTPUT_MORE | BR_ALWAYS); |
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cmd->phy_addr = cpu_to_le32(rm->dma_buf_p + |
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offsetof(struct rackmeter_dma, buf2)); |
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cmd->cmd_dep = cpu_to_le32(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(struct work_struct *work) |
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{ |
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struct rackmeter_cpu *rcpu = |
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container_of(work, struct rackmeter_cpu, sniffer.work); |
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struct rackmeter *rm = rcpu->rm; |
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unsigned int cpu = smp_processor_id(); |
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u64 cur_nsecs, total_idle_nsecs; |
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u64 total_nsecs, idle_nsecs; |
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int i, offset, load, cumm, pause; |
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cur_nsecs = jiffies64_to_nsecs(get_jiffies_64()); |
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total_nsecs = cur_nsecs - rcpu->prev_wall; |
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rcpu->prev_wall = cur_nsecs; |
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total_idle_nsecs = get_cpu_idle_time(cpu); |
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idle_nsecs = total_idle_nsecs - rcpu->prev_idle; |
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idle_nsecs = min(idle_nsecs, total_nsecs); |
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rcpu->prev_idle = total_idle_nsecs; |
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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 = div64_u64(9 * (total_nsecs - idle_nsecs), total_nsecs); |
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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 rackmeter_init_cpu_sniffer(struct rackmeter *rm) |
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{ |
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unsigned int cpu; |
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|
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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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rm->cpu[0].rm = rm; |
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INIT_DELAYED_WORK(&rm->cpu[0].sniffer, rackmeter_do_timer); |
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rm->cpu[1].rm = rm; |
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INIT_DELAYED_WORK(&rm->cpu[1].sniffer, rackmeter_do_timer); |
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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_nsecs(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 rackmeter_stop_cpu_sniffer(struct rackmeter *rm) |
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{ |
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cancel_delayed_work_sync(&rm->cpu[0].sniffer); |
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cancel_delayed_work_sync(&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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|
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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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|
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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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|
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/* Make sure the CPU gets us in order */ |
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rmb(); |
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|
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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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|
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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 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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|
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pr_debug("rackmeter_probe()\n"); |
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|
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/* Get i2s-a node */ |
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for_each_child_of_node(mdev->ofdev.dev.of_node, i2s) |
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if (of_node_name_eq(i2s, "i2s-a")) |
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break; |
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|
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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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for_each_child_of_node(i2s, np) { |
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if (of_node_name_eq(np, "lightshow")) |
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break; |
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if (of_node_name_eq(np, "sound") && |
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of_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(*rm), 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: %pOF" |
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" (%d resources, %d interrupts)\n", |
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mdev->ofdev.dev.of_node); |
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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: %pOF\n", |
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mdev->ofdev.dev.of_node); |
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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 || |
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of_address_to_resource(i2s, 0, &ri2s) || |
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of_address_to_resource(i2s, 1, &rdma)) { |
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printk(KERN_ERR |
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"rackmeter: found match but lacks resources: %pOF", |
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mdev->ofdev.dev.of_node); |
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rc = -ENXIO; |
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goto bail_free; |
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} |
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#endif |
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|
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pr_debug(" i2s @0x%08x\n", (unsigned int)ri2s.start); |
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pr_debug(" dma @0x%08x\n", (unsigned int)rdma.start); |
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pr_debug(" irq %d\n", rm->irq); |
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|
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rm->ubuf = (u8 *)__get_free_page(GFP_KERNEL); |
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if (rm->ubuf == NULL) { |
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printk(KERN_ERR |
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"rackmeter: failed to allocate samples page !\n"); |
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rc = -ENOMEM; |
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goto bail_release; |
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} |
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|
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rm->dma_buf_v = dma_alloc_coherent(&macio_get_pci_dev(mdev)->dev, |
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sizeof(struct rackmeter_dma), |
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&rm->dma_buf_p, GFP_KERNEL); |
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if (rm->dma_buf_v == NULL) { |
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printk(KERN_ERR |
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"rackmeter: failed to allocate dma buffer !\n"); |
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rc = -ENOMEM; |
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goto bail_free_samples; |
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} |
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#if 0 |
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rm->i2s_regs = ioremap(macio_resource_start(mdev, 0), 0x1000); |
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#else |
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rm->i2s_regs = ioremap(ri2s.start, 0x1000); |
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#endif |
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if (rm->i2s_regs == NULL) { |
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printk(KERN_ERR |
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"rackmeter: failed to map i2s registers !\n"); |
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rc = -ENXIO; |
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goto bail_free_dma; |
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} |
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#if 0 |
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rm->dma_regs = ioremap(macio_resource_start(mdev, 1), 0x100); |
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#else |
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rm->dma_regs = ioremap(rdma.start, 0x100); |
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#endif |
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if (rm->dma_regs == NULL) { |
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printk(KERN_ERR |
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"rackmeter: failed to map dma registers !\n"); |
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rc = -ENXIO; |
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goto bail_unmap_i2s; |
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} |
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|
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rc = rackmeter_setup(rm); |
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if (rc) { |
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printk(KERN_ERR |
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"rackmeter: failed to initialize !\n"); |
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rc = -ENXIO; |
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goto bail_unmap_dma; |
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} |
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|
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rc = request_irq(rm->irq, rackmeter_irq, 0, "rackmeter", rm); |
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if (rc != 0) { |
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printk(KERN_ERR |
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"rackmeter: failed to request interrupt !\n"); |
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goto bail_stop_dma; |
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} |
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of_node_put(np); |
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return 0; |
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|
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bail_stop_dma: |
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DBDMA_DO_RESET(rm->dma_regs); |
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bail_unmap_dma: |
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iounmap(rm->dma_regs); |
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bail_unmap_i2s: |
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iounmap(rm->i2s_regs); |
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bail_free_dma: |
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dma_free_coherent(&macio_get_pci_dev(mdev)->dev, |
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sizeof(struct rackmeter_dma), |
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rm->dma_buf_v, rm->dma_buf_p); |
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bail_free_samples: |
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free_page((unsigned long)rm->ubuf); |
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bail_release: |
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#if 0 |
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macio_release_resources(mdev); |
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#endif |
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bail_free: |
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kfree(rm); |
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bail: |
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of_node_put(i2s); |
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of_node_put(np); |
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dev_set_drvdata(&mdev->ofdev.dev, NULL); |
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return rc; |
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} |
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|
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static int rackmeter_remove(struct macio_dev* mdev) |
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{ |
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struct rackmeter *rm = dev_get_drvdata(&mdev->ofdev.dev); |
|
|
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/* Stop CPU sniffer timer & work queues */ |
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rackmeter_stop_cpu_sniffer(rm); |
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|
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/* Clear reference to private data */ |
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dev_set_drvdata(&mdev->ofdev.dev, NULL); |
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|
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/* 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 const struct of_device_id rackmeter_match[] = { |
|
{ .name = "i2s" }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, rackmeter_match); |
|
|
|
static struct macio_driver rackmeter_driver = { |
|
.driver = { |
|
.name = "rackmeter", |
|
.owner = THIS_MODULE, |
|
.of_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_driver); |
|
} |
|
|
|
static void __exit rackmeter_exit(void) |
|
{ |
|
pr_debug("rackmeter_exit()\n"); |
|
|
|
macio_unregister_driver(&rackmeter_driver); |
|
} |
|
|
|
module_init(rackmeter_init); |
|
module_exit(rackmeter_exit); |
|
|
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("Benjamin Herrenschmidt <[email protected]>"); |
|
MODULE_DESCRIPTION("RackMeter: Support vu-meter on XServe front panel");
|
|
|