[PATCH v2 04/17] memory: tegra: add flush operation for Tegra114 memory clients

Vince Hsu
2015-03-12T12:15:37Z

This patch adds the hot reset register table and flush related callback
functions for Tegra114.

Signed-off-by: Vince Hsu <vinceh@nvidia.com>
---
drivers/memory/tegra/mc.h | 5 ++
drivers/memory/tegra/tegra114.c | 104 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 109 insertions(+)

diff --git a/drivers/memory/tegra/mc.h b/drivers/memory/tegra/mc.h
index d5d21147fc77..2c3b8db04073 100644
--- a/drivers/memory/tegra/mc.h
+++ b/drivers/memory/tegra/mc.h
@@ -25,6 +25,11 @@ static inline void mc_writel(struct tegra_mc *mc, u32 value,
writel(value, mc->regs + offset);
}

+int tegra114_mc_flush(struct tegra_mc *mc,
+ const struct tegra_mc_hotreset *hotreset);
+int tegra114_mc_flush_done(struct tegra_mc *mc,
+ const struct tegra_mc_hotreset *hotreset);
+
#ifdef CONFIG_ARCH_TEGRA_3x_SOC
extern const struct tegra_mc_soc tegra30_mc_soc;
#endif
diff --git a/drivers/memory/tegra/tegra114.c b/drivers/memory/tegra/tegra114.c
index 92ab5552fcee..b5040e653aa2 100644
--- a/drivers/memory/tegra/tegra114.c
+++ b/drivers/memory/tegra/tegra114.c
@@ -6,6 +6,8 @@
* published by the Free Software Foundation.
*/

+#include <linux/delay.h>
+#include <linux/device.h>
#include <linux/of.h>
#include <linux/mm.h>

@@ -914,6 +916,105 @@ static const struct tegra_smmu_swgroup tegra114_swgroups[] = {
{ .swgroup = TEGRA_SWGROUP_TSEC, .reg = 0x294 },
};

+static struct tegra_mc_hotreset tegra114_mc_hotreset[] = {
+ {TEGRA_SWGROUP_AVPC, 0x200, 0x204, 1},
+ {TEGRA_SWGROUP_DC, 0x200, 0x204, 2},
+ {TEGRA_SWGROUP_DCB, 0x200, 0x204, 3},
+ {TEGRA_SWGROUP_EPP, 0x200, 0x204, 4},
+ {TEGRA_SWGROUP_G2, 0x200, 0x204, 5},
+ {TEGRA_SWGROUP_HC, 0x200, 0x204, 6},
+ {TEGRA_SWGROUP_HDA, 0x200, 0x204, 7},
+ {TEGRA_SWGROUP_ISP, 0x200, 0x204, 8},
+ {TEGRA_SWGROUP_MPCORE, 0x200, 0x204, 9},
+ {TEGRA_SWGROUP_MPCORELP, 0x200, 0x204, 10},
+ {TEGRA_SWGROUP_MSENC, 0x200, 0x204, 11},
+ {TEGRA_SWGROUP_NV, 0x200, 0x204, 12},
+ {TEGRA_SWGROUP_PPCS, 0x200, 0x204, 14},
+ {TEGRA_SWGROUP_VDE, 0x200, 0x204, 16},
+ {TEGRA_SWGROUP_VI, 0x200, 0x204, 17},
+};
+
+/*
+ * Must be called with mc->lock held
+ */
+static bool tegra114_stable_hotreset_check(struct tegra_mc *mc,
+ u32 reg, u32 *stat)
+{
+ int i;
+ u32 cur_stat;
+ u32 prv_stat;
+
+ /*
+ * There might be a glitch seen with the status register if we program
+ * the control register and then read the status register in a short
+ * window (on the order of 5 cycles) due to a HW bug. So here we poll
+ * for a stable status read.
+ */
+ prv_stat = mc_readl(mc, reg);
+ for (i = 0; i < 5; i++) {
+ cur_stat = mc_readl(mc, reg);
+ if (cur_stat != prv_stat)
+ return false;
+ }
+ *stat = cur_stat;
+ return true;
+}
+
+int tegra114_mc_flush(struct tegra_mc *mc,
+ const struct tegra_mc_hotreset *hotreset)
+{
+ u32 val;
+
+ if (!mc || !hotreset)
+ return -EINVAL;
+
+ mutex_lock(&mc->lock);
+
+ val = mc_readl(mc, hotreset->ctrl);
+ val |= BIT(hotreset->bit);
+ mc_writel(mc, val, hotreset->ctrl);
+ mc_readl(mc, hotreset->ctrl);
+
+ /* poll till the flush is done */
+ do {
+ udelay(10);
+ val = 0;
+ if (!tegra114_stable_hotreset_check(mc, hotreset->status, &val))
+ continue;
+ } while (!(val & BIT(hotreset->bit)));
+
+ mutex_unlock(&mc->lock);
+
+ dev_dbg(mc->dev, "%s bit %d\n", __func__, hotreset->bit);
+ return 0;
+}
+
+int tegra114_mc_flush_done(struct tegra_mc *mc,
+ const struct tegra_mc_hotreset *hotreset)
+{
+ u32 val;
+
+ if (!mc || !hotreset)
+ return -EINVAL;
+
+ mutex_lock(&mc->lock);
+
+ val = mc_readl(mc, hotreset->ctrl);
+ val &= ~BIT(hotreset->bit);
+ mc_writel(mc, val, hotreset->ctrl);
+ mc_readl(mc, hotreset->ctrl);
+
+ mutex_unlock(&mc->lock);
+
+ dev_dbg(mc->dev, "%s bit %d\n", __func__, hotreset->bit);
+ return 0;
+}
+
+static const struct tegra_mc_ops tegra114_mc_ops = {
+ .flush = tegra114_mc_flush,
+ .flush_done = tegra114_mc_flush_done,
+};
+
static void tegra114_flush_dcache(struct page *page, unsigned long offset,
size_t size)
{
@@ -945,4 +1046,7 @@ const struct tegra_mc_soc tegra114_mc_soc = {
.num_address_bits = 32,
.atom_size = 32,
.smmu = &tegra114_smmu_soc,
+ .hotresets = tegra114_mc_hotreset,
+ .num_hotresets = ARRAY_SIZE(tegra114_mc_hotreset),
+ .ops = &tegra114_mc_ops,
};
--
2.1.4