Signed-off-by: Vince Hsu <[email protected]>
---
drivers/memory/tegra/tegra124.c | 108 +++++++++++++++++++++++++++++++++++++++-
1 file changed, 107 insertions(+), 1 deletion(-)
diff --git a/drivers/memory/tegra/tegra124.c b/drivers/memory/tegra/tegra124.c
index 278d40b854c1..cce255d3df5c 100644
--- a/drivers/memory/tegra/tegra124.c
+++ b/drivers/memory/tegra/tegra124.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>
@@ -15,7 +17,7 @@
#include "mc.h"
-static const struct tegra_mc_client tegra124_mc_clients[] = {
+static struct tegra_mc_client tegra124_mc_clients[] = {
{
.id = 0x00,
.name = "ptcr",
@@ -959,7 +961,108 @@ static const struct tegra_smmu_swgroup
tegra124_swgroups[] = {
{ .swgroup = TEGRA_SWGROUP_VI, .reg = 0x280 },
};
+static struct tegra_mc_hotreset tegra124_mc_hotreset[] = {
+ {TEGRA_SWGROUP_AFI, 0x200, 0x204, 0},
+ {TEGRA_SWGROUP_AVPC, 0x200, 0x204, 1},
+ {TEGRA_SWGROUP_DC, 0x200, 0x204, 2},
+ {TEGRA_SWGROUP_DCB, 0x200, 0x204, 3},
+ {TEGRA_SWGROUP_HC, 0x200, 0x204, 6},
+ {TEGRA_SWGROUP_HDA, 0x200, 0x204, 7},
+ {TEGRA_SWGROUP_ISP2, 0x200, 0x204, 8},
+ {TEGRA_SWGROUP_MPCORE, 0x200, 0x204, 9},
+ {TEGRA_SWGROUP_MPCORELP, 0x200, 0x204, 10},
+ {TEGRA_SWGROUP_MSENC, 0x200, 0x204, 11},
+ {TEGRA_SWGROUP_PPCS, 0x200, 0x204, 14},
+ {TEGRA_SWGROUP_SATA, 0x200, 0x204, 15},
+ {TEGRA_SWGROUP_VDE, 0x200, 0x204, 16},
+ {TEGRA_SWGROUP_VI, 0x200, 0x204, 17},
+ {TEGRA_SWGROUP_VIC, 0x200, 0x204, 18},
+ {TEGRA_SWGROUP_XUSB_HOST, 0x200, 0x204, 19},
+ {TEGRA_SWGROUP_XUSB_DEV, 0x200, 0x204, 20},
+ {TEGRA_SWGROUP_TSEC, 0x200, 0x204, 22},
+ {TEGRA_SWGROUP_SDMMC1A, 0x200, 0x204, 29},
+ {TEGRA_SWGROUP_SDMMC2A, 0x200, 0x204, 30},
+ {TEGRA_SWGROUP_SDMMC3A, 0x200, 0x204, 31},
+ {TEGRA_SWGROUP_SDMMC4A, 0x970, 0x974, 0},
+ {TEGRA_SWGROUP_ISP2B, 0x970, 0x974, 1},
+ {TEGRA_SWGROUP_GPU, 0x970, 0x974, 2},
+};
+
#ifdef CONFIG_ARCH_TEGRA_124_SOC
+
+static bool tegra124_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 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;
+}
+
+static int tegra124_mc_flush(struct tegra_mc *mc,
+ const struct tegra_mc_hotreset *hotreset)
+{
+ u32 val;
+
+ if (!mc || !hotreset)
+ return -EINVAL;
+
+ /* XXX add mutex */
+
+ 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 (!tegra124_stable_hotreset_check(mc, hotreset->status, &val))
+ continue;
+ } while (!(val & BIT(hotreset->bit)));
+
+ dev_dbg(mc->dev, "%s bit %d\n", __func__, hotreset->bit);
+ return 0;
+}
+
+static int tegra124_mc_flush_done(struct tegra_mc *mc,
+ const struct tegra_mc_hotreset *hotreset)
+{
+ u32 val;
+
+ if (!mc || !hotreset)
+ return -EINVAL;
+
+ /* XXX add mutex */
+
+ val = mc_readl(mc, hotreset->ctrl);
+ val &= ~BIT(hotreset->bit);
+ mc_writel(mc, val, hotreset->ctrl);
+ mc_readl(mc, hotreset->ctrl);
+
+ dev_dbg(mc->dev, "%s bit %d\n", __func__, hotreset->bit);
+ return 0;
+}
+
+static const struct tegra_mc_ops tegra124_mc_ops = {
+ .flush = tegra124_mc_flush,
+ .flush_done = tegra124_mc_flush_done,
+};
+
static void tegra124_flush_dcache(struct page *page, unsigned long offset,
size_t size)
{
@@ -991,5 +1094,8 @@ const struct tegra_mc_soc tegra124_mc_soc = {
.num_address_bits = 34,
.atom_size = 32,
.smmu = &tegra124_smmu_soc,
+ .hotresets = tegra124_mc_hotreset,
+ .num_hotresets = ARRAY_SIZE(tegra124_mc_hotreset),
+ .ops = &tegra124_mc_ops,
};
#endif /* CONFIG_ARCH_TEGRA_124_SOC */
--
1.9.1
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