[SCSI] bfa: Flash Controller PLL initialization fixes

- Made changes to check the flash controller status before IOC initialization.
- Made changes to poll on the FLASH_STS_REG bit to check if the flash controller
  initialization is completed during the PLL init.

Signed-off-by: Vijaya Mohan Guvva <vmohan@brocade.com>
Signed-off-by: Krishna Gudipati <kgudipat@brocade.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

2 files changed, 131 insertions, 83 deletions

diff --git a/drivers/scsi/bfa/bfa_ioc_ct.c b/drivers/scsi/bfa/bfa_ioc_ct.c
index 29efbb7484a..de4e726a126 100644
--- a/drivers/scsi/bfa/bfa_ioc_ct.c
+++ b/drivers/scsi/bfa/bfa_ioc_ct.c
@@ -744,25 +744,6 @@ bfa_ioc_ct2_mem_init(void __iomem *rb)
 void
 bfa_ioc_ct2_mac_reset(void __iomem *rb)
 {
-	u32	r32;
-
-	bfa_ioc_ct2_sclk_init(rb);
-	bfa_ioc_ct2_lclk_init(rb);
-
-	/*
-	 * release soft reset on s_clk & l_clk
-	 */
-	r32 = readl((rb + CT2_APP_PLL_SCLK_CTL_REG));
-	writel(r32 & ~__APP_PLL_SCLK_LOGIC_SOFT_RESET,
-		(rb + CT2_APP_PLL_SCLK_CTL_REG));
-
-	/*
-	 * release soft reset on s_clk & l_clk
-	 */
-	r32 = readl((rb + CT2_APP_PLL_LCLK_CTL_REG));
-	writel(r32 & ~__APP_PLL_LCLK_LOGIC_SOFT_RESET,
-		(rb + CT2_APP_PLL_LCLK_CTL_REG));
-
 	/* put port0, port1 MAC & AHB in reset */
 	writel((__CSI_MAC_RESET | __CSI_MAC_AHB_RESET),
 		rb + CT2_CSI_MAC_CONTROL_REG(0));
@@ -770,8 +751,21 @@ bfa_ioc_ct2_mac_reset(void __iomem *rb)
 		rb + CT2_CSI_MAC_CONTROL_REG(1));
 }
 
+static void
+bfa_ioc_ct2_enable_flash(void __iomem *rb)
+{
+	u32 r32;
+
+	r32 = readl((rb + PSS_GPIO_OUT_REG));
+	writel(r32 & ~1, (rb + PSS_GPIO_OUT_REG));
+	r32 = readl((rb + PSS_GPIO_OE_REG));
+	writel(r32 | 1, (rb + PSS_GPIO_OE_REG));
+}
+
 #define CT2_NFC_MAX_DELAY	1000
-#define CT2_NFC_VER_VALID	0x143
+#define CT2_NFC_PAUSE_MAX_DELAY 4000
+#define CT2_NFC_VER_VALID	0x147
+#define CT2_NFC_STATE_RUNNING   0x20000001
 #define BFA_IOC_PLL_POLL	1000000
 
 static bfa_boolean_t
@@ -787,6 +781,20 @@ bfa_ioc_ct2_nfc_halted(void __iomem *rb)
 }
 
 static void
+bfa_ioc_ct2_nfc_halt(void __iomem *rb)
+{
+	int	i;
+
+	writel(__HALT_NFC_CONTROLLER, rb + CT2_NFC_CSR_SET_REG);
+	for (i = 0; i < CT2_NFC_MAX_DELAY; i++) {
+		if (bfa_ioc_ct2_nfc_halted(rb))
+			break;
+		udelay(1000);
+	}
+	WARN_ON(!bfa_ioc_ct2_nfc_halted(rb));
+}
+
+static void
 bfa_ioc_ct2_nfc_resume(void __iomem *rb)
 {
 	u32	r32;
@@ -802,105 +810,142 @@ bfa_ioc_ct2_nfc_resume(void __iomem *rb)
 	WARN_ON(1);
 }
 
-bfa_status_t
-bfa_ioc_ct2_pll_init(void __iomem *rb, enum bfi_asic_mode mode)
+static void
+bfa_ioc_ct2_clk_reset(void __iomem *rb)
 {
-	u32 wgn, r32, nfc_ver, i;
+	u32 r32;
 
-	wgn = readl(rb + CT2_WGN_STATUS);
-	nfc_ver = readl(rb + CT2_RSC_GPR15_REG);
+	bfa_ioc_ct2_sclk_init(rb);
+	bfa_ioc_ct2_lclk_init(rb);
 
-	if ((wgn == (__A2T_AHB_LOAD | __WGN_READY)) &&
-	    (nfc_ver >= CT2_NFC_VER_VALID)) {
-		if (bfa_ioc_ct2_nfc_halted(rb))
-			bfa_ioc_ct2_nfc_resume(rb);
+	/*
+	 * release soft reset on s_clk & l_clk
+	 */
+	r32 = readl((rb + CT2_APP_PLL_SCLK_CTL_REG));
+	writel(r32 & ~__APP_PLL_SCLK_LOGIC_SOFT_RESET,
+			(rb + CT2_APP_PLL_SCLK_CTL_REG));
 
-		writel(__RESET_AND_START_SCLK_LCLK_PLLS,
-		       rb + CT2_CSI_FW_CTL_SET_REG);
+	r32 = readl((rb + CT2_APP_PLL_LCLK_CTL_REG));
+	writel(r32 & ~__APP_PLL_LCLK_LOGIC_SOFT_RESET,
+			(rb + CT2_APP_PLL_LCLK_CTL_REG));
 
-		for (i = 0; i < BFA_IOC_PLL_POLL; i++) {
-			r32 = readl(rb + CT2_APP_PLL_LCLK_CTL_REG);
-			if (r32 & __RESET_AND_START_SCLK_LCLK_PLLS)
-				break;
-		}
+}
 
-		WARN_ON(!(r32 & __RESET_AND_START_SCLK_LCLK_PLLS));
+static void
+bfa_ioc_ct2_nfc_clk_reset(void __iomem *rb)
+{
+	u32 r32, i;
 
-		for (i = 0; i < BFA_IOC_PLL_POLL; i++) {
-			r32 = readl(rb + CT2_APP_PLL_LCLK_CTL_REG);
-			if (!(r32 & __RESET_AND_START_SCLK_LCLK_PLLS))
-				break;
-		}
+	r32 = readl((rb + PSS_CTL_REG));
+	r32 |= (__PSS_LPU0_RESET | __PSS_LPU1_RESET);
+	writel(r32, (rb + PSS_CTL_REG));
+
+	writel(__RESET_AND_START_SCLK_LCLK_PLLS, rb + CT2_CSI_FW_CTL_SET_REG);
+
+	for (i = 0; i < BFA_IOC_PLL_POLL; i++) {
+		r32 = readl(rb + CT2_NFC_FLASH_STS_REG);
+
+		if ((r32 & __FLASH_PLL_INIT_AND_RESET_IN_PROGRESS))
+			break;
+	}
+	WARN_ON(!(r32 & __FLASH_PLL_INIT_AND_RESET_IN_PROGRESS));
+
+	for (i = 0; i < BFA_IOC_PLL_POLL; i++) {
+		r32 = readl(rb + CT2_NFC_FLASH_STS_REG);
+
+		if (!(r32 & __FLASH_PLL_INIT_AND_RESET_IN_PROGRESS))
+			break;
+	}
+	WARN_ON((r32 & __FLASH_PLL_INIT_AND_RESET_IN_PROGRESS));
+
+	r32 = readl(rb + CT2_CSI_FW_CTL_REG);
+	WARN_ON((r32 & __RESET_AND_START_SCLK_LCLK_PLLS));
+}
+
+static void
+bfa_ioc_ct2_wait_till_nfc_running(void __iomem *rb)
+{
+	u32 r32;
+	int i;
 
-		WARN_ON(r32 & __RESET_AND_START_SCLK_LCLK_PLLS);
+	if (bfa_ioc_ct2_nfc_halted(rb))
+		bfa_ioc_ct2_nfc_resume(rb);
+	for (i = 0; i < CT2_NFC_PAUSE_MAX_DELAY; i++) {
+		r32 = readl(rb + CT2_NFC_STS_REG);
+		if (r32 == CT2_NFC_STATE_RUNNING)
+			return;
 		udelay(1000);
+	}
 
-		r32 = readl(rb + CT2_CSI_FW_CTL_REG);
-		WARN_ON(r32 & __RESET_AND_START_SCLK_LCLK_PLLS);
-	} else {
-		writel(__HALT_NFC_CONTROLLER, rb + CT2_NFC_CSR_SET_REG);
-		for (i = 0; i < CT2_NFC_MAX_DELAY; i++) {
-			r32 = readl(rb + CT2_NFC_CSR_SET_REG);
-			if (r32 & __NFC_CONTROLLER_HALTED)
-				break;
-			udelay(1000);
-		}
+	r32 = readl(rb + CT2_NFC_STS_REG);
+	WARN_ON(!(r32 == CT2_NFC_STATE_RUNNING));
+}
 
-		bfa_ioc_ct2_mac_reset(rb);
-		bfa_ioc_ct2_sclk_init(rb);
-		bfa_ioc_ct2_lclk_init(rb);
+bfa_status_t
+bfa_ioc_ct2_pll_init(void __iomem *rb, enum bfi_asic_mode mode)
+{
+	u32 wgn, r32, nfc_ver;
 
-		/*
-		 * release soft reset on s_clk & l_clk
-		 */
-		r32 = readl(rb + CT2_APP_PLL_SCLK_CTL_REG);
-		writel(r32 & ~__APP_PLL_SCLK_LOGIC_SOFT_RESET,
-		       (rb + CT2_APP_PLL_SCLK_CTL_REG));
+	wgn = readl(rb + CT2_WGN_STATUS);
 
+	if (wgn == (__WGN_READY | __GLBL_PF_VF_CFG_RDY)) {
 		/*
-		 * release soft reset on s_clk & l_clk
+		 * If flash is corrupted, enable flash explicitly
 		 */
-		r32 = readl(rb + CT2_APP_PLL_LCLK_CTL_REG);
-		writel(r32 & ~__APP_PLL_LCLK_LOGIC_SOFT_RESET,
-		      (rb + CT2_APP_PLL_LCLK_CTL_REG));
-	}
+		bfa_ioc_ct2_clk_reset(rb);
+		bfa_ioc_ct2_enable_flash(rb);
 
-	/*
-	 * Announce flash device presence, if flash was corrupted.
-	 */
-	if (wgn == (__WGN_READY | __GLBL_PF_VF_CFG_RDY)) {
-		r32 = readl(rb + PSS_GPIO_OUT_REG);
-		writel(r32 & ~1, (rb + PSS_GPIO_OUT_REG));
-		r32 = readl(rb + PSS_GPIO_OE_REG);
-		writel(r32 | 1, (rb + PSS_GPIO_OE_REG));
+		bfa_ioc_ct2_mac_reset(rb);
+
+		bfa_ioc_ct2_clk_reset(rb);
+		bfa_ioc_ct2_enable_flash(rb);
+
+	} else {
+		nfc_ver = readl(rb + CT2_RSC_GPR15_REG);
+
+		if ((nfc_ver >= CT2_NFC_VER_VALID) &&
+		    (wgn == (__A2T_AHB_LOAD | __WGN_READY))) {
+
+			bfa_ioc_ct2_wait_till_nfc_running(rb);
+
+			bfa_ioc_ct2_nfc_clk_reset(rb);
+		} else {
+			bfa_ioc_ct2_nfc_halt(rb);
+
+			bfa_ioc_ct2_clk_reset(rb);
+			bfa_ioc_ct2_mac_reset(rb);
+			bfa_ioc_ct2_clk_reset(rb);
+
+		}
 	}
 
 	/*
 	 * Mask the interrupts and clear any
-	 * pending interrupts.
+	 * pending interrupts left by BIOS/EFI
 	 */
+
 	writel(1, (rb + CT2_LPU0_HOSTFN_MBOX0_MSK));
 	writel(1, (rb + CT2_LPU1_HOSTFN_MBOX0_MSK));
 
 	/* For first time initialization, no need to clear interrupts */
 	r32 = readl(rb + HOST_SEM5_REG);
 	if (r32 & 0x1) {
-		r32 = readl(rb + CT2_LPU0_HOSTFN_CMD_STAT);
+		r32 = readl((rb + CT2_LPU0_HOSTFN_CMD_STAT));
 		if (r32 == 1) {
-			writel(1, rb + CT2_LPU0_HOSTFN_CMD_STAT);
+			writel(1, (rb + CT2_LPU0_HOSTFN_CMD_STAT));
 			readl((rb + CT2_LPU0_HOSTFN_CMD_STAT));
 		}
-		r32 = readl(rb + CT2_LPU1_HOSTFN_CMD_STAT);
+		r32 = readl((rb + CT2_LPU1_HOSTFN_CMD_STAT));
 		if (r32 == 1) {
-			writel(1, rb + CT2_LPU1_HOSTFN_CMD_STAT);
-			readl(rb + CT2_LPU1_HOSTFN_CMD_STAT);
+			writel(1, (rb + CT2_LPU1_HOSTFN_CMD_STAT));
+			readl((rb + CT2_LPU1_HOSTFN_CMD_STAT));
 		}
 	}
 
 	bfa_ioc_ct2_mem_init(rb);
 
-	writel(BFI_IOC_UNINIT, rb + CT2_BFA_IOC0_STATE_REG);
-	writel(BFI_IOC_UNINIT, rb + CT2_BFA_IOC1_STATE_REG);
+	writel(BFI_IOC_UNINIT, (rb + CT2_BFA_IOC0_STATE_REG));
+	writel(BFI_IOC_UNINIT, (rb + CT2_BFA_IOC1_STATE_REG));
 
 	return BFA_STATUS_OK;
 }
diff --git a/drivers/scsi/bfa/bfi_reg.h b/drivers/scsi/bfa/bfi_reg.h
index ed5f159e186..99133bcf53f 100644
--- a/drivers/scsi/bfa/bfi_reg.h
+++ b/drivers/scsi/bfa/bfi_reg.h
@@ -338,6 +338,7 @@ enum {
 #define __A2T_AHB_LOAD			0x00000800
 #define __WGN_READY			0x00000400
 #define __GLBL_PF_VF_CFG_RDY		0x00000200
+#define CT2_NFC_STS_REG			0x00027410
 #define CT2_NFC_CSR_CLR_REG		0x00027420
 #define CT2_NFC_CSR_SET_REG		0x00027424
 #define __HALT_NFC_CONTROLLER		0x00000002
@@ -355,6 +356,8 @@ enum {
 	(CT2_CSI_MAC0_CONTROL_REG +	\
 	(__n) * (CT2_CSI_MAC1_CONTROL_REG - CT2_CSI_MAC0_CONTROL_REG))
 
+#define CT2_NFC_FLASH_STS_REG		0x00014834
+#define __FLASH_PLL_INIT_AND_RESET_IN_PROGRESS	0x00000020
 /*
  * Name semaphore registers based on usage
  */