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spmi: spmi-pmic-arb-debug: add clock management support

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Add support to enable and disable the clock used by the SPMI PMIC
arbiter debug bus.  This is needed to avoid unclocked accesses.

Change-Id: If9eee1317a88c143452d8b46b89aff89d1e956b7
Signed-off-by: David Collins <collinsd@codeaurora.org>
This commit is contained in:
David Collins 2017-04-20 16:34:46 -07:00 committed by David Collins
parent 4ad3a1751d
commit f13a8268c1
1 changed files with 27 additions and 0 deletions
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27
drivers/spmi/spmi-pmic-arb-debug.c
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@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2012-2017, The Linux Foundation. All rights reserved. */
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
@ -59,6 +60,7 @@ enum pmic_arb_cmd_op_code {
struct spmi_pmic_arb_debug {
void __iomem *addr;
raw_spinlock_t lock;
struct clk *clock;
};
static inline void pmic_arb_debug_write(struct spmi_pmic_arb_debug *pa,
@ -171,6 +173,12 @@ static int pmic_arb_debug_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
else
return -EINVAL;
rc = clk_prepare_enable(pa->clock);
if (rc) {
pr_err("%s: failed to enable core clock, rc=%d\n",
__func__, rc);
return rc;
}
raw_spin_lock_irqsave(&pa->lock, flags);
rc = pmic_arb_debug_issue_command(ctrl, opc, sid, addr, len);
@ -182,6 +190,7 @@ static int pmic_arb_debug_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
buf[i] = pmic_arb_debug_read(pa, PMIC_ARB_DEBUG_RDATA(i));
done:
raw_spin_unlock_irqrestore(&pa->lock, flags);
clk_disable_unprepare(pa->clock);
return rc;
}
@ -211,6 +220,12 @@ static int pmic_arb_debug_write_cmd(struct spmi_controller *ctrl, u8 opc,
else
return -EINVAL;
rc = clk_prepare_enable(pa->clock);
if (rc) {
pr_err("%s: failed to enable core clock, rc=%d\n",
__func__, rc);
return rc;
}
raw_spin_lock_irqsave(&pa->lock, flags);
/* Write data to FIFO */
@ -220,6 +235,7 @@ static int pmic_arb_debug_write_cmd(struct spmi_controller *ctrl, u8 opc,
rc = pmic_arb_debug_issue_command(ctrl, opc, sid, addr, len);
raw_spin_unlock_irqrestore(&pa->lock, flags);
clk_disable_unprepare(pa->clock);
return rc;
}
@ -283,6 +299,17 @@ static int spmi_pmic_arb_debug_probe(struct platform_device *pdev)
goto err_put_ctrl;
}
if (of_find_property(pdev->dev.of_node, "clock-names", NULL)) {
pa->clock = devm_clk_get(&pdev->dev, "core_clk");
if (IS_ERR(pa->clock)) {
rc = PTR_ERR(pa->clock);
if (rc != -EPROBE_DEFER)
dev_err(&pdev->dev, "unable to request core clock, rc=%d\n",
rc);
goto err_put_ctrl;
}
}
platform_set_drvdata(pdev, ctrl);
raw_spin_lock_init(&pa->lock);