1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com>
12 #include <asm/addrspace.h>
13 #include <asm/types.h>
14 #include <dm/pinctrl.h>
15 #include <mach/ar71xx_regs.h>
17 /* CLOCK_DIVIDER = 3 (SPI clock = 200 / 8 ~ 25 MHz) */
18 #define ATH79_SPI_CLK_DIV(x) (((x) >> 1) - 1)
19 #define ATH79_SPI_RRW_DELAY_FACTOR 12000
20 #define ATH79_SPI_MHZ (1000 * 1000)
22 struct ath79_spi_priv
{
27 static void spi_cs_activate(struct udevice
*dev
)
29 struct udevice
*bus
= dev_get_parent(dev
);
30 struct ath79_spi_priv
*priv
= dev_get_priv(bus
);
32 writel(AR71XX_SPI_FS_GPIO
, priv
->regs
+ AR71XX_SPI_REG_FS
);
33 writel(AR71XX_SPI_IOC_CS_ALL
, priv
->regs
+ AR71XX_SPI_REG_IOC
);
36 static void spi_cs_deactivate(struct udevice
*dev
)
38 struct udevice
*bus
= dev_get_parent(dev
);
39 struct ath79_spi_priv
*priv
= dev_get_priv(bus
);
41 writel(AR71XX_SPI_IOC_CS_ALL
, priv
->regs
+ AR71XX_SPI_REG_IOC
);
42 writel(0, priv
->regs
+ AR71XX_SPI_REG_FS
);
45 static int ath79_spi_claim_bus(struct udevice
*dev
)
50 static int ath79_spi_release_bus(struct udevice
*dev
)
55 static int ath79_spi_xfer(struct udevice
*dev
, unsigned int bitlen
,
56 const void *dout
, void *din
, unsigned long flags
)
58 struct udevice
*bus
= dev_get_parent(dev
);
59 struct ath79_spi_priv
*priv
= dev_get_priv(bus
);
60 struct dm_spi_slave_platdata
*slave
= dev_get_parent_platdata(dev
);
63 u8 curbyte
, curbitlen
, restbits
;
64 u32 bytes
= bitlen
/ 8;
68 if (flags
& SPI_XFER_BEGIN
)
71 restbits
= (bitlen
% 8);
75 out
= AR71XX_SPI_IOC_CS_ALL
& ~(AR71XX_SPI_IOC_CS(slave
->cs
));
82 if (restbits
&& !bytes
) {
84 curbyte
<<= 8 - restbits
;
89 for (curbyte
<<= (8 - curbitlen
); curbitlen
; curbitlen
--) {
91 out
|= AR71XX_SPI_IOC_DO
;
93 out
&= ~(AR71XX_SPI_IOC_DO
);
95 writel(out
, priv
->regs
+ AR71XX_SPI_REG_IOC
);
97 /* delay for low level */
98 if (priv
->rrw_delay
) {
99 tick
= get_ticks() + priv
->rrw_delay
;
100 while (get_ticks() < tick
)
104 writel(out
| AR71XX_SPI_IOC_CLK
,
105 priv
->regs
+ AR71XX_SPI_REG_IOC
);
107 /* delay for high level */
108 if (priv
->rrw_delay
) {
109 tick
= get_ticks() + priv
->rrw_delay
;
110 while (get_ticks() < tick
)
118 writel(out
, priv
->regs
+ AR71XX_SPI_REG_IOC
);
120 in
= readl(priv
->regs
+ AR71XX_SPI_REG_RDS
);
122 if (restbits
&& !bytes
)
123 *rx
++ = (in
<< (8 - restbits
));
129 if (flags
& SPI_XFER_END
)
130 spi_cs_deactivate(dev
);
136 static int ath79_spi_set_speed(struct udevice
*bus
, uint speed
)
138 struct ath79_spi_priv
*priv
= dev_get_priv(bus
);
143 div
= get_bus_freq(0) / speed
;
151 /* calculate delay */
153 do_div(time
, speed
/ 2);
154 val
= get_bus_freq(0) / ATH79_SPI_MHZ
;
155 val
= ATH79_SPI_RRW_DELAY_FACTOR
/ val
;
157 priv
->rrw_delay
= time
- val
+ 1;
161 writel(AR71XX_SPI_FS_GPIO
, priv
->regs
+ AR71XX_SPI_REG_FS
);
162 clrsetbits_be32(priv
->regs
+ AR71XX_SPI_REG_CTRL
,
163 AR71XX_SPI_CTRL_DIV_MASK
,
164 ATH79_SPI_CLK_DIV(div
));
165 writel(0, priv
->regs
+ AR71XX_SPI_REG_FS
);
169 static int ath79_spi_set_mode(struct udevice
*bus
, uint mode
)
174 static int ath79_spi_probe(struct udevice
*bus
)
176 struct ath79_spi_priv
*priv
= dev_get_priv(bus
);
179 addr
= devfdt_get_addr(bus
);
180 if (addr
== FDT_ADDR_T_NONE
)
183 priv
->regs
= map_physmem(addr
,
187 /* Init SPI Hardware, disable remap, set clock */
188 writel(AR71XX_SPI_FS_GPIO
, priv
->regs
+ AR71XX_SPI_REG_FS
);
189 writel(AR71XX_SPI_CTRL_RD
| ATH79_SPI_CLK_DIV(8),
190 priv
->regs
+ AR71XX_SPI_REG_CTRL
);
191 writel(0, priv
->regs
+ AR71XX_SPI_REG_FS
);
196 static int ath79_cs_info(struct udevice
*bus
, uint cs
,
197 struct spi_cs_info
*info
)
199 /* Always allow activity on CS 0/1/2 */
206 static const struct dm_spi_ops ath79_spi_ops
= {
207 .claim_bus
= ath79_spi_claim_bus
,
208 .release_bus
= ath79_spi_release_bus
,
209 .xfer
= ath79_spi_xfer
,
210 .set_speed
= ath79_spi_set_speed
,
211 .set_mode
= ath79_spi_set_mode
,
212 .cs_info
= ath79_cs_info
,
215 static const struct udevice_id ath79_spi_ids
[] = {
216 { .compatible
= "qca,ar7100-spi" },
220 U_BOOT_DRIVER(ath79_spi
) = {
223 .of_match
= ath79_spi_ids
,
224 .ops
= &ath79_spi_ops
,
225 .priv_auto_alloc_size
= sizeof(struct ath79_spi_priv
),
226 .probe
= ath79_spi_probe
,