drivers/gpu/drm/lima/lima_pmu.c

   1 // SPDX-License-Identifier: GPL-2.0 OR MIT
   2 /* Copyright 2017-2019 Qiang Yu <yuq825@gmail.com> */
   3
   4 #include <linux/iopoll.h>
   5 #include <linux/device.h>
   6
   7 #include "lima_device.h"
   8 #include "lima_pmu.h"
   9 #include "lima_regs.h"
  10
  11 #define pmu_write(reg, data) writel(data, ip->iomem + reg)
  12 #define pmu_read(reg) readl(ip->iomem + reg)
  13
  14 static int lima_pmu_wait_cmd(struct lima_ip *ip)
  15 {
  16         struct lima_device *dev = ip->dev;
  17         int err;
  18         u32 v;
  19
  20         err = readl_poll_timeout(ip->iomem + LIMA_PMU_INT_RAWSTAT,
  21                                  v, v & LIMA_PMU_INT_CMD_MASK,
  22                                  100, 100000);
  23         if (err) {
  24                 dev_err(dev->dev, "timeout wait pmd cmd\n");
  25                 return err;
  26         }
  27
  28         pmu_write(LIMA_PMU_INT_CLEAR, LIMA_PMU_INT_CMD_MASK);
  29         return 0;
  30 }
  31
  32 int lima_pmu_init(struct lima_ip *ip)
  33 {
  34         int err;
  35         u32 stat;
  36
  37         pmu_write(LIMA_PMU_INT_MASK, 0);
  38
  39         /* If this value is too low, when in high GPU clk freq,
  40          * GPU will be in unstable state.
  41          */
  42         pmu_write(LIMA_PMU_SW_DELAY, 0xffff);
  43
  44         /* status reg 1=off 0=on */
  45         stat = pmu_read(LIMA_PMU_STATUS);
  46
  47         /* power up all ip */
  48         if (stat) {
  49                 pmu_write(LIMA_PMU_POWER_UP, stat);
  50                 err = lima_pmu_wait_cmd(ip);
  51                 if (err)
  52                         return err;
  53         }
  54         return 0;
  55 }
  56
  57 void lima_pmu_fini(struct lima_ip *ip)
  58 {
  59
  60 }