21 #include <soc/tegra/fuse.h>
23 #include "fuse.h"
29 static u32 tegra20_fuse_read_early(struct tegra_fuse *fuse, unsigned int offset)  in tegra20_fuse_read_early()  argument
31 	return readl_relaxed(fuse->base + FUSE_BEGIN + offset);  in tegra20_fuse_read_early()
36 	struct tegra_fuse *fuse = args;  in apb_dma_complete()  local
38 	complete(&fuse->apbdma.wait);  in apb_dma_complete()
41 static u32 tegra20_fuse_read(struct tegra_fuse *fuse, unsigned int offset)  in tegra20_fuse_read()  argument
49 	mutex_lock(&fuse->apbdma.lock);  in tegra20_fuse_read()
51 	fuse->apbdma.config.src_addr = fuse->phys + FUSE_BEGIN + offset;  in tegra20_fuse_read()
53 	err = dmaengine_slave_config(fuse->apbdma.chan, &fuse->apbdma.config);  in tegra20_fuse_read()
57 	dma_desc = dmaengine_prep_slave_single(fuse->apbdma.chan,  in tegra20_fuse_read()
58 					       fuse->apbdma.phys,  in tegra20_fuse_read()
65 	dma_desc->callback_param = fuse;  in tegra20_fuse_read()
67 	reinit_completion(&fuse->apbdma.wait);  in tegra20_fuse_read()
69 	clk_prepare_enable(fuse->clk);  in tegra20_fuse_read()
72 	dma_async_issue_pending(fuse->apbdma.chan);  in tegra20_fuse_read()
73 	time_left = wait_for_completion_timeout(&fuse->apbdma.wait,  in tegra20_fuse_read()
77 		dmaengine_terminate_all(fuse->apbdma.chan);  in tegra20_fuse_read()
79 		value = *fuse->apbdma.virt;  in tegra20_fuse_read()
81 	clk_disable_unprepare(fuse->clk);  in tegra20_fuse_read()
84 	mutex_unlock(&fuse->apbdma.lock);  in tegra20_fuse_read()
95 static int tegra20_fuse_probe(struct tegra_fuse *fuse)  in tegra20_fuse_probe()  argument
102 	fuse->apbdma.chan = dma_request_channel(mask, dma_filter, NULL);  in tegra20_fuse_probe()
103 	if (!fuse->apbdma.chan)  in tegra20_fuse_probe()
106 	fuse->apbdma.virt = dma_alloc_coherent(fuse->dev, sizeof(u32),  in tegra20_fuse_probe()
107 					       &fuse->apbdma.phys,  in tegra20_fuse_probe()
109 	if (!fuse->apbdma.virt) {  in tegra20_fuse_probe()
110 		dma_release_channel(fuse->apbdma.chan);  in tegra20_fuse_probe()
114 	fuse->apbdma.config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;  in tegra20_fuse_probe()
115 	fuse->apbdma.config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;  in tegra20_fuse_probe()
116 	fuse->apbdma.config.src_maxburst = 1;  in tegra20_fuse_probe()
117 	fuse->apbdma.config.dst_maxburst = 1;  in tegra20_fuse_probe()
118 	fuse->apbdma.config.direction = DMA_DEV_TO_MEM;  in tegra20_fuse_probe()
119 	fuse->apbdma.config.device_fc = false;  in tegra20_fuse_probe()
121 	init_completion(&fuse->apbdma.wait);  in tegra20_fuse_probe()
122 	mutex_init(&fuse->apbdma.lock);  in tegra20_fuse_probe()
123 	fuse->read = tegra20_fuse_read;  in tegra20_fuse_probe()
153 static void __init tegra20_fuse_init(struct tegra_fuse *fuse)  in tegra20_fuse_init()  argument
155 	fuse->read_early = tegra20_fuse_read_early;  in tegra20_fuse_init()
158 	fuse->soc->speedo_init(&tegra_sku_info);  in tegra20_fuse_init()