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From 034fb94799289990283082eef61934f5eb9e939f Mon Sep 17 00:00:00 2001
From: Jes Sorensen <Jes.Sorensen@redhat.com>
Date: Fri, 26 Aug 2016 16:09:00 -0400
Subject: [PATCH] rtl8xxxu: Implement rtl8188eu_power_off()
This allows the firmware to reload correctly upon rmmod/insmod.
However the device still doesn't receive data upon reloading.
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
.../net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188e.c | 130 ++++++++++++++++++++-
.../net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h | 2 +
2 files changed, 131 insertions(+), 1 deletion(-)
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188e.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188e.c
@@ -1191,6 +1191,71 @@ exit:
return ret;
}
+static int rtl8188eu_emu_to_disabled(struct rtl8xxxu_priv *priv)
+{
+ u8 val8;
+
+ /* 0x04[12:11] = 01 enable WL suspend */
+ val8 = rtl8xxxu_read8(priv, REG_APS_FSMCO + 2);
+ val8 &= ~BIT(0);
+ rtl8xxxu_write8(priv, REG_APS_FSMCO + 2, val8);
+
+ val8 = rtl8xxxu_read8(priv, REG_APS_FSMCO + 1);
+ val8 |= BIT(7);
+ rtl8xxxu_write8(priv, REG_APS_FSMCO + 1, val8);
+
+ return 0;
+}
+
+static int rtl8188eu_active_to_lps(struct rtl8xxxu_priv *priv)
+{
+ struct device *dev = &priv->udev->dev;
+ u8 val8;
+ u16 val16;
+ u32 val32;
+ int retry, retval;
+
+ rtl8xxxu_write8(priv, REG_TXPAUSE, 0x7f);
+
+ retry = 100;
+ retval = -EBUSY;
+ /*
+ * Poll 32 bit wide 0x05f8 for 0x00000000 to ensure no TX is pending.
+ */
+ do {
+ val32 = rtl8xxxu_read32(priv, 0x05f8);
+ if (!val32) {
+ retval = 0;
+ break;
+ }
+ } while (retry--);
+
+ if (!retry) {
+ dev_warn(dev, "Failed to flush TX queue\n");
+ retval = -EBUSY;
+ goto out;
+ }
+
+ /* Disable CCK and OFDM, clock gated */
+ val8 = rtl8xxxu_read8(priv, REG_SYS_FUNC);
+ val8 &= ~SYS_FUNC_BBRSTB;
+ rtl8xxxu_write8(priv, REG_SYS_FUNC, val8);
+
+ udelay(2);
+
+ /* Reset MAC TRX */
+ val16 = rtl8xxxu_read16(priv, REG_CR);
+ val16 &= ~(CR_MAC_TX_ENABLE | CR_MAC_RX_ENABLE | CR_SECURITY_ENABLE);
+ rtl8xxxu_write16(priv, REG_CR, val8);
+
+ val8 = rtl8xxxu_read8(priv, REG_DUAL_TSF_RST);
+ val8 |= DUAL_TSF_TX_OK;
+ rtl8xxxu_write8(priv, REG_DUAL_TSF_RST, val8);
+
+out:
+ return retval;
+}
+
static int rtl8188eu_power_on(struct rtl8xxxu_priv *priv)
{
u16 val16;
@@ -1221,6 +1286,69 @@ exit:
return ret;
}
+void rtl8188eu_power_off(struct rtl8xxxu_priv *priv)
+{
+ u8 val8;
+ u16 val16;
+
+ rtl8xxxu_flush_fifo(priv);
+
+ val8 = rtl8xxxu_read8(priv, REG_TX_REPORT_CTRL);
+ val8 &= ~TX_REPORT_CTRL_TIMER_ENABLE;
+ rtl8xxxu_write8(priv, REG_TX_REPORT_CTRL, val8);
+
+ /* Turn off RF */
+ rtl8xxxu_write8(priv, REG_RF_CTRL, 0x00);
+
+ rtl8188eu_active_to_lps(priv);
+
+ /* Reset Firmware if running in RAM */
+ if (rtl8xxxu_read8(priv, REG_MCU_FW_DL) & MCU_FW_RAM_SEL)
+ rtl8xxxu_firmware_self_reset(priv);
+
+ /* Reset MCU */
+ val16 = rtl8xxxu_read16(priv, REG_SYS_FUNC);
+ val16 &= ~SYS_FUNC_CPU_ENABLE;
+ rtl8xxxu_write16(priv, REG_SYS_FUNC, val16);
+
+ /* Reset MCU ready status */
+ rtl8xxxu_write8(priv, REG_MCU_FW_DL, 0x00);
+
+ /* 32K_CTRL looks to be very 8188e specific */
+ val8 = rtl8xxxu_read8(priv, REG_32K_CTRL);
+ val8 &= ~BIT(0);
+ rtl8xxxu_write8(priv, REG_32K_CTRL, val8);
+
+ rtl8188eu_active_to_emu(priv);
+ rtl8188eu_emu_to_disabled(priv);
+
+ /* Reset MCU IO Wrapper */
+ val8 = rtl8xxxu_read8(priv, REG_RSV_CTRL + 1);
+ val8 &= ~BIT(3);
+ rtl8xxxu_write8(priv, REG_RSV_CTRL + 1, val8);
+
+ val8 = rtl8xxxu_read8(priv, REG_RSV_CTRL + 1);
+ val8 |= BIT(3);
+ rtl8xxxu_write8(priv, REG_RSV_CTRL + 1, val8);
+
+ /* Vendor driver refers to GPIO_IN */
+ val8 = rtl8xxxu_read8(priv, REG_GPIO_PIN_CTRL);
+ /* Vendor driver refers to GPIO_OUT */
+ rtl8xxxu_write8(priv, REG_GPIO_PIN_CTRL + 1, val8);
+ rtl8xxxu_write8(priv, REG_GPIO_PIN_CTRL + 2, 0xff);
+
+ val8 = rtl8xxxu_read8(priv, REG_GPIO_IO_SEL);
+ rtl8xxxu_write8(priv, REG_GPIO_IO_SEL + 1, val8 << 4);
+ val8 = rtl8xxxu_read8(priv, REG_GPIO_IO_SEL + 1);
+ rtl8xxxu_write8(priv, REG_GPIO_IO_SEL + 1, val8 | 0x0f);
+
+ /*
+ * Set LNA, TRSW, EX_PA Pin to output mode
+ * Referred to as REG_BB_PAD_CTRL in 8188eu vendor driver
+ */
+ rtl8xxxu_write32(priv, REG_PAD_CTRL1, 0x00080808);
+}
+
static void rtl8188e_enable_rf(struct rtl8xxxu_priv *priv)
{
rtl8xxxu_write8(priv, REG_TXPAUSE, 0x00);
@@ -1265,7 +1393,7 @@ struct rtl8xxxu_fileops rtl8188eu_fops =
.parse_efuse = rtl8188eu_parse_efuse,
.load_firmware = rtl8188eu_load_firmware,
.power_on = rtl8188eu_power_on,
- .power_off = rtl8xxxu_power_off,
+ .power_off = rtl8188eu_power_off,
.reset_8051 = rtl8188eu_reset_8051,
.llt_init = rtl8xxxu_init_llt_table,
.init_phy_bb = rtl8188eu_init_phy_bb,
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h
@@ -413,6 +413,8 @@
#define REG_MBIST_START 0x0174
#define REG_MBIST_DONE 0x0178
#define REG_MBIST_FAIL 0x017c
+/* 8188EU */
+#define REG_32K_CTRL 0x0194
#define REG_C2HEVT_MSG_NORMAL 0x01a0
/* 8192EU/8723BU/8812 */
#define REG_C2HEVT_CMD_ID_8723B 0x01ae
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