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@ -14,6 +14,12 @@ struct msg_set_power_state { |
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u32 end_tag; |
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}; |
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struct msg_get_clock_rate { |
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struct bcm2835_mbox_hdr hdr; |
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struct bcm2835_mbox_tag_get_clock_rate get_clock_rate; |
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u32 end_tag; |
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}; |
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int bcm2835_power_on_module(u32 module) |
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{ |
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ALLOC_CACHE_ALIGN_BUFFER(struct msg_set_power_state, msg_pwr, 1); |
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@ -37,3 +43,25 @@ int bcm2835_power_on_module(u32 module) |
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return 0; |
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} |
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int bcm2835_get_mmc_clock(void) |
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{ |
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ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_clock_rate, msg_clk, 1); |
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int ret; |
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ret = bcm2835_power_on_module(BCM2835_MBOX_POWER_DEVID_SDHCI); |
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if (ret) |
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return ret; |
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BCM2835_MBOX_INIT_HDR(msg_clk); |
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BCM2835_MBOX_INIT_TAG(&msg_clk->get_clock_rate, GET_CLOCK_RATE); |
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msg_clk->get_clock_rate.body.req.clock_id = BCM2835_MBOX_CLOCK_ID_EMMC; |
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ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_clk->hdr); |
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if (ret) { |
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printf("bcm2835: Could not query eMMC clock rate\n"); |
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return -EIO; |
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} |
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return msg_clk->get_clock_rate.body.resp.rate_hz; |
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} |
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