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pcmcia: Implement CLKRUN protocol disabling for Ricoh bridges
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Currently, "disable_clkrun" yenta_socket module parameter is only
implemented for TI CardBus bridges.
Add also an implementation for Ricoh bridges that have the necessary
setting documented in publicly available datasheets.

Tested on a RL5C476II with a Sunrich C-160 CardBus NIC that doesn't work
correctly unless the CLKRUN protocol is disabled.

Let's also make it clear in its description that the "disable_clkrun"
module parameter only works on these two previously mentioned brands of
CardBus bridges.

Signed-off-by: Maciej S. Szmigiero <[email protected]>
Cc: [email protected]
Signed-off-by: Dominik Brodowski <[email protected]>
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maciejsszmigiero authored and Dominik Brodowski committed Oct 1, 2018
1 parent 1b22dcf commit 95691e3
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Showing 2 changed files with 37 additions and 1 deletion.
35 changes: 35 additions & 0 deletions drivers/pcmcia/ricoh.h
Original file line number Diff line number Diff line change
Expand Up @@ -119,6 +119,10 @@
#define RL5C4XX_MISC_CONTROL 0x2F /* 8 bit */
#define RL5C4XX_ZV_ENABLE 0x08

/* Misc Control 3 Register */
#define RL5C4XX_MISC3 0x00A2 /* 16 bit */
#define RL5C47X_MISC3_CB_CLKRUN_DIS BIT(1)

#ifdef __YENTA_H

#define rl_misc(socket) ((socket)->private[0])
Expand Down Expand Up @@ -156,6 +160,35 @@ static void ricoh_set_zv(struct yenta_socket *socket)
}
}

static void ricoh_set_clkrun(struct yenta_socket *socket, bool quiet)
{
u16 misc3;

/*
* RL5C475II likely has this setting, too, however no datasheet
* is publicly available for this chip
*/
if (socket->dev->device != PCI_DEVICE_ID_RICOH_RL5C476 &&
socket->dev->device != PCI_DEVICE_ID_RICOH_RL5C478)
return;

if (socket->dev->revision < 0x80)
return;

misc3 = config_readw(socket, RL5C4XX_MISC3);
if (misc3 & RL5C47X_MISC3_CB_CLKRUN_DIS) {
if (!quiet)
dev_dbg(&socket->dev->dev,
"CLKRUN feature already disabled\n");
} else if (disable_clkrun) {
if (!quiet)
dev_info(&socket->dev->dev,
"Disabling CLKRUN feature\n");
misc3 |= RL5C47X_MISC3_CB_CLKRUN_DIS;
config_writew(socket, RL5C4XX_MISC3, misc3);
}
}

static void ricoh_save_state(struct yenta_socket *socket)
{
rl_misc(socket) = config_readw(socket, RL5C4XX_MISC);
Expand All @@ -172,6 +205,7 @@ static void ricoh_restore_state(struct yenta_socket *socket)
config_writew(socket, RL5C4XX_16BIT_IO_0, rl_io(socket));
config_writew(socket, RL5C4XX_16BIT_MEM_0, rl_mem(socket));
config_writew(socket, RL5C4XX_CONFIG, rl_config(socket));
ricoh_set_clkrun(socket, true);
}


Expand All @@ -197,6 +231,7 @@ static int ricoh_override(struct yenta_socket *socket)
config_writew(socket, RL5C4XX_CONFIG, config);

ricoh_set_zv(socket);
ricoh_set_clkrun(socket, false);

return 0;
}
Expand Down
3 changes: 2 additions & 1 deletion drivers/pcmcia/yenta_socket.c
Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,8 @@

static bool disable_clkrun;
module_param(disable_clkrun, bool, 0444);
MODULE_PARM_DESC(disable_clkrun, "If PC card doesn't function properly, please try this option");
MODULE_PARM_DESC(disable_clkrun,
"If PC card doesn't function properly, please try this option (TI and Ricoh bridges only)");

static bool isa_probe = 1;
module_param(isa_probe, bool, 0444);
Expand Down

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