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Message-Id: <20220204054028.3123858-1-ztong0001@gmail.com>
Date: Thu, 3 Feb 2022 21:40:27 -0800
From: Tong Zhang <ztong0001@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Tong Zhang <ztong0001@...il.com>,
Paul Bolle <pebolle@...cali.nl>, linux-staging@...ts.linux.dev,
linux-kernel@...r.kernel.org
Cc: insop.song@...nspeed.com, devel@...verdev.osuosl.org
Subject: [PATCH] staging: gs_fpgaboot: revert removed board specific code
gs_fpgaboot is currently useless since the board specific code is
removed in 06a3fab941da. Loading the driver will always fail since
xl_init_io() always returns -1. This driver is broken since 2014 and I
doubt anyone is actually using it, we could either remove it or revert
to the previous working version.
$ modprobe gs_fpga
GPIO INIT FAIL!!
This patch reverts previously removed code and adds a Kconfig to make
this board selectable for PPC_85xx processors.
Fixes: 06a3fab941da ("staging: gs_fpgaboot: remove checks for CONFIG_B4860G100")
Signed-off-by: Tong Zhang <ztong0001@...il.com>
---
drivers/staging/gs_fpgaboot/Kconfig | 14 ++-
drivers/staging/gs_fpgaboot/io.c | 173 ++++++++++++++++++++++++++++
2 files changed, 186 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/gs_fpgaboot/Kconfig b/drivers/staging/gs_fpgaboot/Kconfig
index 968a153c4ab6..0b4144450123 100644
--- a/drivers/staging/gs_fpgaboot/Kconfig
+++ b/drivers/staging/gs_fpgaboot/Kconfig
@@ -5,4 +5,16 @@
config GS_FPGABOOT
tristate "Xilinx FPGA firmware download module"
help
- Xilinx FPGA firmware download module
+ Xilinx FPGA firmware download module.
+
+choice
+ prompt "Support Board"
+ depends on GS_FPGABOOT
+
+config GS_FPGABOOT_BOARD_B4860G100
+ bool "B4860G100"
+ depends on PPC_85xx
+ help
+ Select this to support B4860G100 board
+
+endchoice
diff --git a/drivers/staging/gs_fpgaboot/io.c b/drivers/staging/gs_fpgaboot/io.c
index 80903ec36b76..059016fb839e 100644
--- a/drivers/staging/gs_fpgaboot/io.c
+++ b/drivers/staging/gs_fpgaboot/io.c
@@ -16,10 +16,15 @@
#include "io.h"
+#ifdef CONFIG_GS_FPGABOOT_BOARD_B4860G100
+static struct gpiobus gbus;
+#endif /* CONFIG_GS_FPGABOOT_BOARD_B4860G100 */
+
static inline void byte0_out(unsigned char data);
static inline void byte1_out(unsigned char data);
static inline void xl_cclk_b(int32_t i);
+
/* Assert and Deassert CCLK */
void xl_shift_cclk(int count)
{
@@ -59,6 +64,172 @@ void xl_shift_bytes_out(enum wbus bus_byte, unsigned char *pdata)
xl_shift_cclk(1);
}
+#ifdef CONFIG_GS_FPGABOOT_BOARD_B4860G100
+/*
+ * ======================================================================
+ * board specific configuration
+ */
+
+static inline void mpc85xx_gpio_set_dir(
+ int32_t port,
+ uint32_t mask,
+ uint32_t dir)
+{
+ dir |= (in_be32(gbus.r[port]+GPDIR) & ~mask);
+ out_be32(gbus.r[port]+GPDIR, dir);
+}
+
+static inline void mpc85xx_gpio_set(int32_t port, uint32_t mask, uint32_t val)
+{
+ /* First mask off the unwanted parts of "dir" and "val" */
+ val &= mask;
+
+ /* Now read in the values we're supposed to preserve */
+ val |= (in_be32(gbus.r[port]+GPDAT) & ~mask);
+
+ out_be32(gbus.r[port]+GPDAT, val);
+}
+
+static inline uint32_t mpc85xx_gpio_get(int32_t port, uint32_t mask)
+{
+ /* Read the requested values */
+ return in_be32(gbus.r[port]+GPDAT) & mask;
+}
+
+static inline void mpc85xx_gpio_set_low(int32_t port, uint32_t gpios)
+{
+ mpc85xx_gpio_set(port, gpios, 0x00000000);
+}
+
+static inline void mpc85xx_gpio_set_high(int32_t port, uint32_t gpios)
+{
+ mpc85xx_gpio_set(port, gpios, 0xFFFFFFFF);
+}
+
+static inline void gpio_set_value(int32_t port, uint32_t gpio, uint32_t value)
+{
+ int32_t g;
+
+ g = 31 - gpio;
+ if (value)
+ mpc85xx_gpio_set_high(port, 1U << g);
+ else
+ mpc85xx_gpio_set_low(port, 1U << g);
+}
+
+static inline int gpio_get_value(int32_t port, uint32_t gpio)
+{
+ int32_t g;
+
+ g = 31 - gpio;
+ return !!mpc85xx_gpio_get(port, 1U << g);
+}
+
+static inline void xl_cclk_b(int32_t i)
+{
+ gpio_set_value(XL_CCLK_PORT, XL_CCLK_PIN, i);
+}
+
+static inline unsigned char bitswap(unsigned char s)
+{
+ unsigned char d;
+
+ d = (((s&0x80)>>7) | ((s&0x40)>>5) | ((s&0x20)>>3) | ((s&0x10)>>1) |
+ ((s&0x08)<<1) | ((s&0x04)<<3) | ((s&0x02)<<5) | ((s&0x01)<<7));
+ return d;
+}
+
+void xl_program_b(int32_t i)
+{
+ gpio_set_value(XL_PROGN_PORT, XL_PROGN_PIN, i);
+}
+
+void xl_rdwr_b(int32_t i)
+{
+ gpio_set_value(XL_RDWRN_PORT, XL_RDWRN_PIN, i);
+}
+
+void xl_csi_b(int32_t i)
+{
+ gpio_set_value(XL_CSIN_PORT, XL_CSIN_PIN, i);
+}
+
+int xl_get_init_b(void)
+{
+ return gpio_get_value(XL_INITN_PORT, XL_INITN_PIN);
+}
+
+int xl_get_done_b(void)
+{
+ return gpio_get_value(XL_DONE_PORT, XL_DONE_PIN);
+}
+
+
+/* G100 specific bit swap and remmap (to gpio pins) for byte 0 */
+static inline uint32_t bit_remap_byte0(uint32_t s)
+{
+ uint32_t d;
+
+ d = (((s&0x80)>>7) | ((s&0x40)>>5) | ((s&0x20)>>3) | ((s&0x10)>>1) |
+ ((s&0x08)<<1) | ((s&0x04)<<3) | ((s&0x02)<<6) | ((s&0x01)<<9));
+ return d;
+}
+
+/*
+ * G100 specific MSB, in this order [byte0 | byte1], out
+ */
+static inline void byte0_out(unsigned char data)
+{
+ uint32_t swap32;
+
+ swap32 = bit_remap_byte0((uint32_t) data) << 8;
+
+ mpc85xx_gpio_set(0, 0x0002BF00, (uint32_t) swap32);
+}
+
+/*
+ * G100 specific LSB, in this order [byte0 | byte1], out
+ */
+static inline void byte1_out(unsigned char data)
+{
+ mpc85xx_gpio_set(0, 0x000000FF, (uint32_t) bitswap(data));
+}
+
+/*
+ * configurable per device type for different I/O config
+ */
+int xl_init_io(void)
+{
+ struct device_node *np;
+ const u32 *p_reg;
+ int reg, cnt;
+
+ cnt = 0;
+ memset(&gbus, 0, sizeof(struct gpiobus));
+ for_each_compatible_node(np, NULL, "fsl,qoriq-gpio") {
+ p_reg = of_get_property(np, "reg", NULL);
+ if (p_reg == NULL)
+ break;
+ reg = (int) *p_reg;
+ gbus.r[cnt] = of_iomap(np, 0);
+
+ if (!gbus.r[cnt]) {
+ pr_err("not findding gpio cell-index %d\n", cnt);
+ return -ENODEV;
+ }
+ cnt++;
+ }
+ mpc85xx_gpio_set_dir(0, 0x0002BFFF, 0x0002BFFF);
+ mpc85xx_gpio_set_dir(1, 0x00240060, 0x00240060);
+
+ gbus.ngpio = cnt;
+
+ return 0;
+}
+
+
+#else /* placeholder for boards with different config */
+
/*
* generic bit swap for xilinx SYSTEMMAP FPGA programming
*/
@@ -103,3 +274,5 @@ int xl_init_io(void)
{
return -1;
}
+
+#endif /* CONFIG_GS_FPGABOOT_BOARD_B4860G100 */
--
2.25.1
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