diff options
author | Thierry Reding <treding@nvidia.com> | 2015-04-29 16:54:04 +0200 |
---|---|---|
committer | Thierry Reding <treding@nvidia.com> | 2015-07-16 10:38:28 +0200 |
commit | 7e939de1b2bb26496e4967e5346619700245e7c0 (patch) | |
tree | 678c17d76d5454d0856e148a6ba11537d562f5d2 /drivers/soc/tegra/fuse/fuse-tegra20.c | |
parent | 297c4f3dcbffe11ce899a7d068ea18079094403b (diff) | |
download | op-kernel-dev-7e939de1b2bb26496e4967e5346619700245e7c0.zip op-kernel-dev-7e939de1b2bb26496e4967e5346619700245e7c0.tar.gz |
soc/tegra: fuse: Unify Tegra20 and Tegra30 drivers
Unifying the drivers makes it easier to restrict the legacy probing
paths to 32-bit ARM. This in turn will come in handy as support for
new 64-bit ARM SoCs is added.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/soc/tegra/fuse/fuse-tegra20.c')
-rw-r--r-- | drivers/soc/tegra/fuse/fuse-tegra20.c | 173 |
1 files changed, 63 insertions, 110 deletions
diff --git a/drivers/soc/tegra/fuse/fuse-tegra20.c b/drivers/soc/tegra/fuse/fuse-tegra20.c index 6acc2c4..b2f2aaa 100644 --- a/drivers/soc/tegra/fuse/fuse-tegra20.c +++ b/drivers/soc/tegra/fuse/fuse-tegra20.c @@ -34,159 +34,107 @@ #include "fuse.h" #define FUSE_BEGIN 0x100 -#define FUSE_SIZE 0x1f8 #define FUSE_UID_LOW 0x08 #define FUSE_UID_HIGH 0x0c -static phys_addr_t fuse_phys; -static struct clk *fuse_clk; -static void __iomem __initdata *fuse_base; - -static DEFINE_MUTEX(apb_dma_lock); -static DECLARE_COMPLETION(apb_dma_wait); -static struct dma_chan *apb_dma_chan; -static struct dma_slave_config dma_sconfig; -static u32 *apb_buffer; -static dma_addr_t apb_buffer_phys; +static u32 tegra20_fuse_read_early(struct tegra_fuse *fuse, unsigned int offset) +{ + return readl_relaxed(fuse->base + FUSE_BEGIN + offset); +} static void apb_dma_complete(void *args) { - complete(&apb_dma_wait); + struct tegra_fuse *fuse = args; + + complete(&fuse->apbdma.wait); } -static u32 tegra20_fuse_readl(const unsigned int offset) +static u32 tegra20_fuse_read(struct tegra_fuse *fuse, unsigned int offset) { - int ret; - u32 val = 0; + unsigned long flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK; struct dma_async_tx_descriptor *dma_desc; unsigned long time_left; + u32 value = 0; + int err; + + mutex_lock(&fuse->apbdma.lock); - mutex_lock(&apb_dma_lock); + fuse->apbdma.config.src_addr = fuse->apbdma.phys + FUSE_BEGIN + offset; - dma_sconfig.src_addr = fuse_phys + FUSE_BEGIN + offset; - ret = dmaengine_slave_config(apb_dma_chan, &dma_sconfig); - if (ret) + err = dmaengine_slave_config(fuse->apbdma.chan, &fuse->apbdma.config); + if (err) goto out; - dma_desc = dmaengine_prep_slave_single(apb_dma_chan, apb_buffer_phys, - sizeof(u32), DMA_DEV_TO_MEM, - DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + dma_desc = dmaengine_prep_slave_single(fuse->apbdma.chan, + fuse->apbdma.phys, + sizeof(u32), DMA_DEV_TO_MEM, + flags); if (!dma_desc) goto out; dma_desc->callback = apb_dma_complete; - dma_desc->callback_param = NULL; + dma_desc->callback_param = fuse; - reinit_completion(&apb_dma_wait); + reinit_completion(&fuse->apbdma.wait); - clk_prepare_enable(fuse_clk); + clk_prepare_enable(fuse->clk); dmaengine_submit(dma_desc); - dma_async_issue_pending(apb_dma_chan); - time_left = wait_for_completion_timeout(&apb_dma_wait, + dma_async_issue_pending(fuse->apbdma.chan); + time_left = wait_for_completion_timeout(&fuse->apbdma.wait, msecs_to_jiffies(50)); if (WARN(time_left == 0, "apb read dma timed out")) - dmaengine_terminate_all(apb_dma_chan); + dmaengine_terminate_all(fuse->apbdma.chan); else - val = *apb_buffer; + value = *fuse->apbdma.virt; - clk_disable_unprepare(fuse_clk); -out: - mutex_unlock(&apb_dma_lock); + clk_disable_unprepare(fuse->clk); - return val; +out: + mutex_unlock(&fuse->apbdma.lock); + return value; } -static const struct of_device_id tegra20_fuse_of_match[] = { - { .compatible = "nvidia,tegra20-efuse" }, - {}, -}; - -static int apb_dma_init(void) +static int tegra20_fuse_probe(struct tegra_fuse *fuse) { dma_cap_mask_t mask; dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); - apb_dma_chan = dma_request_channel(mask, NULL, NULL); - if (!apb_dma_chan) + + fuse->apbdma.chan = dma_request_channel(mask, NULL, NULL); + if (!fuse->apbdma.chan) return -EPROBE_DEFER; - apb_buffer = dma_alloc_coherent(NULL, sizeof(u32), &apb_buffer_phys, - GFP_KERNEL); - if (!apb_buffer) { - dma_release_channel(apb_dma_chan); + fuse->apbdma.virt = dma_alloc_coherent(fuse->dev, sizeof(u32), + &fuse->apbdma.phys, + GFP_KERNEL); + if (!fuse->apbdma.virt) { + dma_release_channel(fuse->apbdma.chan); return -ENOMEM; } - dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; - dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; - dma_sconfig.src_maxburst = 1; - dma_sconfig.dst_maxburst = 1; + fuse->apbdma.config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + fuse->apbdma.config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + fuse->apbdma.config.src_maxburst = 1; + fuse->apbdma.config.dst_maxburst = 1; - return 0; -} - -static int tegra20_fuse_probe(struct platform_device *pdev) -{ - struct resource *res; - int err; - - fuse_clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(fuse_clk)) { - dev_err(&pdev->dev, "missing clock"); - return PTR_ERR(fuse_clk); - } - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) - return -EINVAL; - fuse_phys = res->start; - - err = apb_dma_init(); - if (err) - return err; - - if (tegra_fuse_create_sysfs(&pdev->dev, FUSE_SIZE, tegra20_fuse_readl)) - return -ENODEV; - - dev_dbg(&pdev->dev, "loaded\n"); + init_completion(&fuse->apbdma.wait); + mutex_init(&fuse->apbdma.lock); + fuse->read = tegra20_fuse_read; return 0; } -static struct platform_driver tegra20_fuse_driver = { - .probe = tegra20_fuse_probe, - .driver = { - .name = "tegra20_fuse", - .of_match_table = tegra20_fuse_of_match, - } +static const struct tegra_fuse_info tegra20_fuse_info = { + .read = tegra20_fuse_read, + .size = 0x1f8, + .spare = 0x100, }; -static int __init tegra20_fuse_init(void) -{ - return platform_driver_register(&tegra20_fuse_driver); -} -postcore_initcall(tegra20_fuse_init); - /* Early boot code. This code is called before the devices are created */ -u32 __init tegra20_fuse_early(const unsigned int offset) -{ - return readl_relaxed(fuse_base + FUSE_BEGIN + offset); -} - -bool __init tegra20_spare_fuse_early(int spare_bit) -{ - u32 offset = spare_bit * 4; - bool value; - - value = tegra20_fuse_early(offset + 0x100); - - return value; -} - static void __init tegra20_fuse_add_randomness(void) { u32 randomness[7]; @@ -198,19 +146,24 @@ static void __init tegra20_fuse_add_randomness(void) randomness[3] |= tegra_sku_info.core_process_id; randomness[4] = tegra_sku_info.cpu_speedo_id << 16; randomness[4] |= tegra_sku_info.soc_speedo_id; - randomness[5] = tegra20_fuse_early(FUSE_UID_LOW); - randomness[6] = tegra20_fuse_early(FUSE_UID_HIGH); + randomness[5] = tegra_fuse_read_early(FUSE_UID_LOW); + randomness[6] = tegra_fuse_read_early(FUSE_UID_HIGH); add_device_randomness(randomness, sizeof(randomness)); } -void __init tegra20_init_fuse_early(void) +static void __init tegra20_fuse_init(struct tegra_fuse *fuse) { - fuse_base = ioremap(TEGRA_FUSE_BASE, TEGRA_FUSE_SIZE); + fuse->read_early = tegra20_fuse_read_early; tegra_init_revision(); - tegra20_init_speedo_data(&tegra_sku_info); + fuse->soc->speedo_init(&tegra_sku_info); tegra20_fuse_add_randomness(); - - iounmap(fuse_base); } + +const struct tegra_fuse_soc tegra20_fuse_soc = { + .init = tegra20_fuse_init, + .speedo_init = tegra20_init_speedo_data, + .probe = tegra20_fuse_probe, + .info = &tegra20_fuse_info, +}; |