tegra/fuse/fuse-tegra20.c

22 #include <soc/tegra/fuse.h>
24 #include "fuse.h"
30 static u32 tegra20_fuse_read_early(struct tegra_fuse *fuse, unsigned int offset)
32 	return readl_relaxed(fuse->base + FUSE_BEGIN + offset);
37 	struct tegra_fuse *fuse = args;
39 	complete(&fuse->apbdma.wait);
42 static u32 tegra20_fuse_read(struct tegra_fuse *fuse, unsigned int offset)
50 	err = pm_runtime_resume_and_get(fuse->dev);
54 	mutex_lock(&fuse->apbdma.lock);
56 	fuse->apbdma.config.src_addr = fuse->phys + FUSE_BEGIN + offset;
58 	err = dmaengine_slave_config(fuse->apbdma.chan, &fuse->apbdma.config);
62 	dma_desc = dmaengine_prep_slave_single(fuse->apbdma.chan,
63 					       fuse->apbdma.phys,
70 	dma_desc->callback_param = fuse;
72 	reinit_completion(&fuse->apbdma.wait);
75 	dma_async_issue_pending(fuse->apbdma.chan);
76 	time_left = wait_for_completion_timeout(&fuse->apbdma.wait,
80 		dmaengine_terminate_all(fuse->apbdma.chan);
82 		value = *fuse->apbdma.virt;
85 	mutex_unlock(&fuse->apbdma.lock);
86 	pm_runtime_put(fuse->dev);
99 	struct tegra_fuse *fuse = data;
101 	dma_release_channel(fuse->apbdma.chan);
102 	fuse->apbdma.chan = NULL;
107 	struct tegra_fuse *fuse = data;
109 	dma_free_coherent(fuse->dev, sizeof(u32), fuse->apbdma.virt,
110 			  fuse->apbdma.phys);
111 	fuse->apbdma.virt = NULL;
112 	fuse->apbdma.phys = 0x0;
115 static int tegra20_fuse_probe(struct tegra_fuse *fuse)
123 	fuse->apbdma.chan = dma_request_channel(mask, dma_filter, NULL);
124 	if (!fuse->apbdma.chan)
127 	err = devm_add_action_or_reset(fuse->dev, tegra20_fuse_release_channel,
128 				       fuse);
132 	fuse->apbdma.virt = dma_alloc_coherent(fuse->dev, sizeof(u32),
133 					       &fuse->apbdma.phys,
135 	if (!fuse->apbdma.virt)
138 	err = devm_add_action_or_reset(fuse->dev, tegra20_fuse_free_coherent,
139 				       fuse);
143 	fuse->apbdma.config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
144 	fuse->apbdma.config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
145 	fuse->apbdma.config.src_maxburst = 1;
146 	fuse->apbdma.config.dst_maxburst = 1;
147 	fuse->apbdma.config.direction = DMA_DEV_TO_MEM;
148 	fuse->apbdma.config.device_fc = false;
150 	init_completion(&fuse->apbdma.wait);
151 	mutex_init(&fuse->apbdma.lock);
152 	fuse->read = tegra20_fuse_read;
182 static void __init tegra20_fuse_init(struct tegra_fuse *fuse)
184 	fuse->read_early = tegra20_fuse_read_early;
187 	fuse->soc->speedo_init(&tegra_sku_info);