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ARM: imx27: Retrieve the CCM base address from devicetree
Now that imx27 has been converted to a devicetree-only platform, retrieve the CCM base address from devicetree. Signed-off-by: Fabio Estevam <festevam@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
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1 changed files with 10 additions and 2 deletions
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@ -7,6 +7,7 @@
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* modify it under the terms of the GNU General Public License.
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*/
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#include <linux/of_address.h>
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#include <linux/kernel.h>
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#include <linux/suspend.h>
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#include <linux/io.h>
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static int mx27_suspend_enter(suspend_state_t state)
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{
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void __iomem *ccm_base;
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struct device_node *np;
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u32 cscr;
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np = of_find_compatible_node(NULL, NULL, "fsl,imx27-ccm");
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ccm_base = of_iomap(np, 0);
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BUG_ON(!ccm_base);
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switch (state) {
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case PM_SUSPEND_MEM:
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/* Clear MPEN and SPEN to disable MPLL/SPLL */
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cscr = imx_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
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cscr = imx_readl(ccm_base);
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cscr &= 0xFFFFFFFC;
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imx_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
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imx_writel(cscr, ccm_base);
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/* Executes WFI */
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cpu_do_idle();
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break;
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