drivers: rkflash: Support sfc DLL api

Change-Id: Id4aa6d86ee0fe0a6d4d70ce75d9f15f8be749a1c
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>

Author: Jon Lin

drivers/rkflash/sfc.c

@@ -18,10 +18,12 @@ static void sfc_reset(void)
 	int timeout = 10000;
 
 	writel(SFC_RESET, g_sfc_reg + SFC_RCVR);
+
 	while ((readl(g_sfc_reg + SFC_RCVR) == SFC_RESET) && (timeout > 0)) {
 		sfc_delay(1);
 		timeout--;
 	}
+
 	writel(0xFFFFFFFF, g_sfc_reg + SFC_ICLR);
 }
 
@@ -38,10 +40,29 @@ u32 sfc_get_max_iosize(void)
 		return SFC_MAX_IOSIZE_VER3;
 }
 
+void sfc_set_delay_lines(u16 cells)
+{
+	u16 cell_max = SCLK_SMP_SEL_MAX_V4;
+
+	if (sfc_get_version() >= SFC_VER_5)
+		cell_max = SCLK_SMP_SEL_MAX_V5;
+
+	if (cells > cell_max)
+		cells = cell_max;
+
+	writel(SCLK_SMP_SEL_EN | cells, g_sfc_reg + SFC_DLL_CTRL0);
+}
+
+void sfc_disable_delay_lines(void)
+{
+	writel(0, g_sfc_reg + SFC_DLL_CTRL0);
+}
+
 int sfc_init(void __iomem *reg_addr)
 {
 	g_sfc_reg = reg_addr;
 	writel(0, g_sfc_reg + SFC_CTRL);
+
 	if (sfc_get_version() >= SFC_VER_4)
 		writel(1, g_sfc_reg + SFC_LEN_CTRL);
 
@@ -62,32 +83,40 @@ int sfc_request(struct rk_sfc_op *op, u32 addr, void *data, u32 size)
 	int timeout = 0;
 
 	reg = readl(g_sfc_reg + SFC_FSR);
+
 	if (!(reg & SFC_TXEMPTY) || !(reg & SFC_RXEMPTY) ||
 	    (readl(g_sfc_reg + SFC_SR) & SFC_BUSY))
 		sfc_reset();
 
 	cmd.d32 = op->sfcmd.d32;
+
 	if (cmd.b.addrbits == SFC_ADDR_XBITS) {
 		union SFCCTRL_DATA ctrl;
 
 		ctrl.d32 = op->sfctrl.d32;
+
 		if (!ctrl.b.addrbits)
 			return SFC_PARAM_ERR;
+
 		/* Controller plus 1 automatically */
 		writel(ctrl.b.addrbits - 1, g_sfc_reg + SFC_ABIT);
 	}
+
 	/* shift in the data at negedge sclk_out */
 	op->sfctrl.d32 |= 0x2;
 	cmd.b.datasize = size;
+
 	if (sfc_get_version() >= SFC_VER_4)
 		writel(size, g_sfc_reg + SFC_LEN_EXT);
 	else
 		cmd.b.datasize = size;
 
 	writel(op->sfctrl.d32, g_sfc_reg + SFC_CTRL);
 	writel(cmd.d32, g_sfc_reg + SFC_CMD);
+
 	if (cmd.b.addrbits)
 		writel(addr, g_sfc_reg + SFC_ADDR);
+
 	if (!size)
 		goto exit_wait;
 	if (op->sfctrl.b.enbledma) {
@@ -121,21 +150,27 @@ int sfc_request(struct rk_sfc_op *op, u32 addr, void *data, u32 size)
 
 		if (cmd.b.rw == SFC_WRITE) {
 			words  = (size + 3) >> 2;
+
 			while (words) {
 				fifostat.d32 = readl(g_sfc_reg + SFC_FSR);
+
 				if (fifostat.b.txlevel > 0) {
 					count = words < fifostat.b.txlevel ?
 						words : fifostat.b.txlevel;
+
 					for (i = 0; i < count; i++) {
 						writel(*p_data++,
 						       g_sfc_reg + SFC_DATA);
 						words--;
 					}
+
 					if (words == 0)
 						break;
+
 					timeout = 0;
 				} else {
 					sfc_delay(1);
+
 					if (timeout++ > 10000) {
 						ret = SFC_TX_TIMEOUT;
 						break;
@@ -146,8 +181,10 @@ int sfc_request(struct rk_sfc_op *op, u32 addr, void *data, u32 size)
 			/* SFC_READ == cmd.b.rw */
 			bytes = size & 0x3;
 			words = size >> 2;
+
 			while (words) {
 				fifostat.d32 = readl(g_sfc_reg + SFC_FSR);
+
 				if (fifostat.b.rxlevel > 0) {
 					u32 count;
 
@@ -159,11 +196,14 @@ int sfc_request(struct rk_sfc_op *op, u32 addr, void *data, u32 size)
 								  SFC_DATA);
 						words--;
 					}
+
 					if (words == 0)
 						break;
+
 					timeout = 0;
 				} else {
 					sfc_delay(1);
+
 					if (timeout++ > 10000) {
 						ret = SFC_RX_TIMEOUT;
 						break;
@@ -172,19 +212,24 @@ int sfc_request(struct rk_sfc_op *op, u32 addr, void *data, u32 size)
 			}
 
 			timeout = 0;
+
 			while (bytes) {
 				fifostat.d32 = readl(g_sfc_reg + SFC_FSR);
+
 				if (fifostat.b.rxlevel > 0) {
 					u8 *p_data1 = (u8 *)p_data;
 
 					words = readl(g_sfc_reg + SFC_DATA);
+
 					for (i = 0; i < bytes; i++)
 						p_data1[i] =
-						(u8)((words >> (i * 8)) & 0xFF);
+							(u8)((words >> (i * 8)) & 0xFF);
+
 					break;
 				}
 
 				sfc_delay(1);
+
 				if (timeout++ > 10000) {
 					ret = SFC_RX_TIMEOUT;
 					break;
@@ -195,13 +240,16 @@ int sfc_request(struct rk_sfc_op *op, u32 addr, void *data, u32 size)
 
 exit_wait:
 	timeout = 0;    /* wait cmd or data send complete */
+
 	while (readl(g_sfc_reg + SFC_SR) & SFC_BUSY) {
 		sfc_delay(1);
+
 		if (timeout++ > 100000) {         /* wait 100ms */
 			ret = SFC_TX_TIMEOUT;
 			break;
 		}
 	}
+
 	sfc_delay(1); /* CS# High Time (read/write) >100ns */
 	return ret;
 }

drivers/rkflash/sfc.h

@@ -7,6 +7,7 @@
 
 #define SFC_VER_3		0x3
 #define SFC_VER_4		0x4
+#define SFC_VER_5		0x5
 
 #define SFC_EN_INT		(0)         /* enable interrupt */
 #define SFC_EN_DMA		(1)         /* enable dma */
@@ -65,6 +66,11 @@
 /* SFC_RCVR Register */
 #define SFC_RESET	BIT(0)     /* controller reset */
 
+/* SFC_DLL_CTRL Register */
+#define SCLK_SMP_SEL_EN		BIT(15)	/* SCLK Sampling Selection */
+#define SCLK_SMP_SEL_MAX_V4	0xFF	/* SCLK Sampling Selection */
+#define SCLK_SMP_SEL_MAX_V5	0x1FF	/* SCLK Sampling Selection */
+
 /* SFC_SR Register */
 /* sfc busy flag. When busy, don't try to set the control register */
 #define SFC_BUSY	BIT(0)
@@ -86,6 +92,7 @@
 #define SFC_RAWISR	0x28
 #define SFC_VER		0x2C
 #define SFC_QOP		0x30
+#define SFC_DLL_CTRL0	0x3C
 #define SFC_DMA_TRIGGER	0x80
 #define SFC_DMA_ADDR	0x84
 #define SFC_LEN_CTRL	0x88
@@ -207,6 +214,8 @@ int sfc_request(struct rk_sfc_op *op, u32 addr, void *data, u32 size);
 u16 sfc_get_version(void);
 void sfc_clean_irq(void);
 u32 sfc_get_max_iosize(void);
+void sfc_set_delay_lines(u16 cells);
+void sfc_disable_delay_lines(void);
 void sfc_handle_irq(void);
 unsigned long rksfc_dma_map_single(unsigned long ptr, int size, int dir);
 void rksfc_dma_unmap_single(unsigned long ptr, int size, int dir);